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32131a9c | 1 | /* Reload pseudo regs into hard regs for insns that require hard regs. |
f5963e61 | 2 | Copyright (C) 1987, 88, 89, 92-97, 1998 Free Software Foundation, Inc. |
32131a9c RK |
3 | |
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU CC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
e99215a3 RK |
18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
32131a9c RK |
20 | |
21 | ||
22 | #include "config.h" | |
670ee920 | 23 | #include "system.h" |
cab634f2 KG |
24 | |
25 | #include "machmode.h" | |
26 | #include "hard-reg-set.h" | |
32131a9c RK |
27 | #include "rtl.h" |
28 | #include "obstack.h" | |
29 | #include "insn-config.h" | |
30 | #include "insn-flags.h" | |
31 | #include "insn-codes.h" | |
32 | #include "flags.h" | |
33 | #include "expr.h" | |
34 | #include "regs.h" | |
cad6f7d0 | 35 | #include "basic-block.h" |
32131a9c RK |
36 | #include "reload.h" |
37 | #include "recog.h" | |
32131a9c | 38 | #include "output.h" |
a9c366bf | 39 | #include "real.h" |
10f0ad3d | 40 | #include "toplev.h" |
32131a9c RK |
41 | |
42 | /* This file contains the reload pass of the compiler, which is | |
43 | run after register allocation has been done. It checks that | |
44 | each insn is valid (operands required to be in registers really | |
45 | are in registers of the proper class) and fixes up invalid ones | |
46 | by copying values temporarily into registers for the insns | |
47 | that need them. | |
48 | ||
49 | The results of register allocation are described by the vector | |
50 | reg_renumber; the insns still contain pseudo regs, but reg_renumber | |
51 | can be used to find which hard reg, if any, a pseudo reg is in. | |
52 | ||
53 | The technique we always use is to free up a few hard regs that are | |
54 | called ``reload regs'', and for each place where a pseudo reg | |
55 | must be in a hard reg, copy it temporarily into one of the reload regs. | |
56 | ||
03acd8f8 BS |
57 | Reload regs are allocated locally for every instruction that needs |
58 | reloads. When there are pseudos which are allocated to a register that | |
59 | has been chosen as a reload reg, such pseudos must be ``spilled''. | |
60 | This means that they go to other hard regs, or to stack slots if no other | |
32131a9c RK |
61 | available hard regs can be found. Spilling can invalidate more |
62 | insns, requiring additional need for reloads, so we must keep checking | |
63 | until the process stabilizes. | |
64 | ||
65 | For machines with different classes of registers, we must keep track | |
66 | of the register class needed for each reload, and make sure that | |
67 | we allocate enough reload registers of each class. | |
68 | ||
69 | The file reload.c contains the code that checks one insn for | |
70 | validity and reports the reloads that it needs. This file | |
71 | is in charge of scanning the entire rtl code, accumulating the | |
72 | reload needs, spilling, assigning reload registers to use for | |
73 | fixing up each insn, and generating the new insns to copy values | |
74 | into the reload registers. */ | |
546b63fb RK |
75 | |
76 | ||
77 | #ifndef REGISTER_MOVE_COST | |
78 | #define REGISTER_MOVE_COST(x, y) 2 | |
79 | #endif | |
32131a9c RK |
80 | \f |
81 | /* During reload_as_needed, element N contains a REG rtx for the hard reg | |
0f41302f | 82 | into which reg N has been reloaded (perhaps for a previous insn). */ |
32131a9c RK |
83 | static rtx *reg_last_reload_reg; |
84 | ||
85 | /* Elt N nonzero if reg_last_reload_reg[N] has been set in this insn | |
86 | for an output reload that stores into reg N. */ | |
87 | static char *reg_has_output_reload; | |
88 | ||
89 | /* Indicates which hard regs are reload-registers for an output reload | |
90 | in the current insn. */ | |
91 | static HARD_REG_SET reg_is_output_reload; | |
92 | ||
93 | /* Element N is the constant value to which pseudo reg N is equivalent, | |
94 | or zero if pseudo reg N is not equivalent to a constant. | |
95 | find_reloads looks at this in order to replace pseudo reg N | |
96 | with the constant it stands for. */ | |
97 | rtx *reg_equiv_constant; | |
98 | ||
99 | /* Element N is a memory location to which pseudo reg N is equivalent, | |
100 | prior to any register elimination (such as frame pointer to stack | |
101 | pointer). Depending on whether or not it is a valid address, this value | |
102 | is transferred to either reg_equiv_address or reg_equiv_mem. */ | |
4803a34a | 103 | rtx *reg_equiv_memory_loc; |
32131a9c RK |
104 | |
105 | /* Element N is the address of stack slot to which pseudo reg N is equivalent. | |
106 | This is used when the address is not valid as a memory address | |
107 | (because its displacement is too big for the machine.) */ | |
108 | rtx *reg_equiv_address; | |
109 | ||
110 | /* Element N is the memory slot to which pseudo reg N is equivalent, | |
111 | or zero if pseudo reg N is not equivalent to a memory slot. */ | |
112 | rtx *reg_equiv_mem; | |
113 | ||
114 | /* Widest width in which each pseudo reg is referred to (via subreg). */ | |
115 | static int *reg_max_ref_width; | |
116 | ||
117 | /* Element N is the insn that initialized reg N from its equivalent | |
118 | constant or memory slot. */ | |
119 | static rtx *reg_equiv_init; | |
120 | ||
03acd8f8 BS |
121 | /* Vector to remember old contents of reg_renumber before spilling. */ |
122 | static short *reg_old_renumber; | |
123 | ||
e6e52be0 | 124 | /* During reload_as_needed, element N contains the last pseudo regno reloaded |
03acd8f8 | 125 | into hard register N. If that pseudo reg occupied more than one register, |
32131a9c RK |
126 | reg_reloaded_contents points to that pseudo for each spill register in |
127 | use; all of these must remain set for an inheritance to occur. */ | |
128 | static int reg_reloaded_contents[FIRST_PSEUDO_REGISTER]; | |
129 | ||
130 | /* During reload_as_needed, element N contains the insn for which | |
e6e52be0 R |
131 | hard register N was last used. Its contents are significant only |
132 | when reg_reloaded_valid is set for this register. */ | |
32131a9c RK |
133 | static rtx reg_reloaded_insn[FIRST_PSEUDO_REGISTER]; |
134 | ||
e6e52be0 R |
135 | /* Indicate if reg_reloaded_insn / reg_reloaded_contents is valid */ |
136 | static HARD_REG_SET reg_reloaded_valid; | |
137 | /* Indicate if the register was dead at the end of the reload. | |
138 | This is only valid if reg_reloaded_contents is set and valid. */ | |
139 | static HARD_REG_SET reg_reloaded_dead; | |
140 | ||
32131a9c RK |
141 | /* Number of spill-regs so far; number of valid elements of spill_regs. */ |
142 | static int n_spills; | |
143 | ||
144 | /* In parallel with spill_regs, contains REG rtx's for those regs. | |
145 | Holds the last rtx used for any given reg, or 0 if it has never | |
146 | been used for spilling yet. This rtx is reused, provided it has | |
147 | the proper mode. */ | |
148 | static rtx spill_reg_rtx[FIRST_PSEUDO_REGISTER]; | |
149 | ||
150 | /* In parallel with spill_regs, contains nonzero for a spill reg | |
151 | that was stored after the last time it was used. | |
152 | The precise value is the insn generated to do the store. */ | |
153 | static rtx spill_reg_store[FIRST_PSEUDO_REGISTER]; | |
154 | ||
cb2afeb3 R |
155 | /* This is the register that was stored with spill_reg_store. This is a |
156 | copy of reload_out / reload_out_reg when the value was stored; if | |
157 | reload_out is a MEM, spill_reg_stored_to will be set to reload_out_reg. */ | |
158 | static rtx spill_reg_stored_to[FIRST_PSEUDO_REGISTER]; | |
159 | ||
32131a9c RK |
160 | /* This table is the inverse mapping of spill_regs: |
161 | indexed by hard reg number, | |
162 | it contains the position of that reg in spill_regs, | |
13c8e8e3 JL |
163 | or -1 for something that is not in spill_regs. |
164 | ||
165 | ?!? This is no longer accurate. */ | |
32131a9c RK |
166 | static short spill_reg_order[FIRST_PSEUDO_REGISTER]; |
167 | ||
03acd8f8 BS |
168 | /* This reg set indicates registers that can't be used as spill registers for |
169 | the currently processed insn. These are the hard registers which are live | |
170 | during the insn, but not allocated to pseudos, as well as fixed | |
171 | registers. */ | |
32131a9c RK |
172 | static HARD_REG_SET bad_spill_regs; |
173 | ||
03acd8f8 BS |
174 | /* These are the hard registers that can't be used as spill register for any |
175 | insn. This includes registers used for user variables and registers that | |
176 | we can't eliminate. A register that appears in this set also can't be used | |
177 | to retry register allocation. */ | |
178 | static HARD_REG_SET bad_spill_regs_global; | |
179 | ||
32131a9c | 180 | /* Describes order of use of registers for reloading |
03acd8f8 BS |
181 | of spilled pseudo-registers. `n_spills' is the number of |
182 | elements that are actually valid; new ones are added at the end. | |
183 | ||
184 | Both spill_regs and spill_reg_order are used on two occasions: | |
185 | once during find_reload_regs, where they keep track of the spill registers | |
186 | for a single insn, but also during reload_as_needed where they show all | |
187 | the registers ever used by reload. For the latter case, the information | |
188 | is calculated during finish_spills. */ | |
32131a9c RK |
189 | static short spill_regs[FIRST_PSEUDO_REGISTER]; |
190 | ||
03acd8f8 BS |
191 | /* This vector of reg sets indicates, for each pseudo, which hard registers |
192 | may not be used for retrying global allocation because the register was | |
193 | formerly spilled from one of them. If we allowed reallocating a pseudo to | |
194 | a register that it was already allocated to, reload might not | |
195 | terminate. */ | |
196 | static HARD_REG_SET *pseudo_previous_regs; | |
197 | ||
198 | /* This vector of reg sets indicates, for each pseudo, which hard | |
199 | registers may not be used for retrying global allocation because they | |
200 | are used as spill registers during one of the insns in which the | |
201 | pseudo is live. */ | |
202 | static HARD_REG_SET *pseudo_forbidden_regs; | |
203 | ||
204 | /* All hard regs that have been used as spill registers for any insn are | |
205 | marked in this set. */ | |
206 | static HARD_REG_SET used_spill_regs; | |
8b4f9969 | 207 | |
4079cd63 JW |
208 | /* Index of last register assigned as a spill register. We allocate in |
209 | a round-robin fashion. */ | |
4079cd63 JW |
210 | static int last_spill_reg; |
211 | ||
32131a9c RK |
212 | /* Describes order of preference for putting regs into spill_regs. |
213 | Contains the numbers of all the hard regs, in order most preferred first. | |
214 | This order is different for each function. | |
215 | It is set up by order_regs_for_reload. | |
216 | Empty elements at the end contain -1. */ | |
217 | static short potential_reload_regs[FIRST_PSEUDO_REGISTER]; | |
218 | ||
32131a9c RK |
219 | /* Nonzero if indirect addressing is supported on the machine; this means |
220 | that spilling (REG n) does not require reloading it into a register in | |
221 | order to do (MEM (REG n)) or (MEM (PLUS (REG n) (CONST_INT c))). The | |
222 | value indicates the level of indirect addressing supported, e.g., two | |
223 | means that (MEM (MEM (REG n))) is also valid if (REG n) does not get | |
224 | a hard register. */ | |
32131a9c RK |
225 | static char spill_indirect_levels; |
226 | ||
227 | /* Nonzero if indirect addressing is supported when the innermost MEM is | |
228 | of the form (MEM (SYMBOL_REF sym)). It is assumed that the level to | |
229 | which these are valid is the same as spill_indirect_levels, above. */ | |
32131a9c RK |
230 | char indirect_symref_ok; |
231 | ||
232 | /* Nonzero if an address (plus (reg frame_pointer) (reg ...)) is valid. */ | |
32131a9c RK |
233 | char double_reg_address_ok; |
234 | ||
235 | /* Record the stack slot for each spilled hard register. */ | |
32131a9c RK |
236 | static rtx spill_stack_slot[FIRST_PSEUDO_REGISTER]; |
237 | ||
238 | /* Width allocated so far for that stack slot. */ | |
32131a9c RK |
239 | static int spill_stack_slot_width[FIRST_PSEUDO_REGISTER]; |
240 | ||
7609e720 BS |
241 | /* Record which pseudos needed to be spilled. */ |
242 | static regset spilled_pseudos; | |
243 | ||
32131a9c RK |
244 | /* First uid used by insns created by reload in this function. |
245 | Used in find_equiv_reg. */ | |
246 | int reload_first_uid; | |
247 | ||
248 | /* Flag set by local-alloc or global-alloc if anything is live in | |
249 | a call-clobbered reg across calls. */ | |
32131a9c RK |
250 | int caller_save_needed; |
251 | ||
252 | /* Set to 1 while reload_as_needed is operating. | |
253 | Required by some machines to handle any generated moves differently. */ | |
32131a9c RK |
254 | int reload_in_progress = 0; |
255 | ||
256 | /* These arrays record the insn_code of insns that may be needed to | |
257 | perform input and output reloads of special objects. They provide a | |
258 | place to pass a scratch register. */ | |
32131a9c RK |
259 | enum insn_code reload_in_optab[NUM_MACHINE_MODES]; |
260 | enum insn_code reload_out_optab[NUM_MACHINE_MODES]; | |
261 | ||
d45cf215 | 262 | /* This obstack is used for allocation of rtl during register elimination. |
32131a9c RK |
263 | The allocated storage can be freed once find_reloads has processed the |
264 | insn. */ | |
32131a9c | 265 | struct obstack reload_obstack; |
cad6f7d0 BS |
266 | |
267 | /* Points to the beginning of the reload_obstack. All insn_chain structures | |
268 | are allocated first. */ | |
269 | char *reload_startobj; | |
270 | ||
271 | /* The point after all insn_chain structures. Used to quickly deallocate | |
272 | memory used while processing one insn. */ | |
32131a9c RK |
273 | char *reload_firstobj; |
274 | ||
275 | #define obstack_chunk_alloc xmalloc | |
276 | #define obstack_chunk_free free | |
277 | ||
32131a9c RK |
278 | /* List of labels that must never be deleted. */ |
279 | extern rtx forced_labels; | |
cad6f7d0 BS |
280 | |
281 | /* List of insn_chain instructions, one for every insn that reload needs to | |
282 | examine. */ | |
283 | struct insn_chain *reload_insn_chain; | |
7609e720 | 284 | |
03acd8f8 | 285 | /* List of all insns needing reloads. */ |
7609e720 | 286 | static struct insn_chain *insns_need_reload; |
32131a9c RK |
287 | \f |
288 | /* This structure is used to record information about register eliminations. | |
289 | Each array entry describes one possible way of eliminating a register | |
290 | in favor of another. If there is more than one way of eliminating a | |
291 | particular register, the most preferred should be specified first. */ | |
292 | ||
293 | static struct elim_table | |
294 | { | |
0f41302f MS |
295 | int from; /* Register number to be eliminated. */ |
296 | int to; /* Register number used as replacement. */ | |
297 | int initial_offset; /* Initial difference between values. */ | |
298 | int can_eliminate; /* Non-zero if this elimination can be done. */ | |
32131a9c | 299 | int can_eliminate_previous; /* Value of CAN_ELIMINATE in previous scan over |
0f41302f MS |
300 | insns made by reload. */ |
301 | int offset; /* Current offset between the two regs. */ | |
302 | int max_offset; /* Maximum offset between the two regs. */ | |
303 | int previous_offset; /* Offset at end of previous insn. */ | |
304 | int ref_outside_mem; /* "to" has been referenced outside a MEM. */ | |
32131a9c RK |
305 | rtx from_rtx; /* REG rtx for the register to be eliminated. |
306 | We cannot simply compare the number since | |
307 | we might then spuriously replace a hard | |
308 | register corresponding to a pseudo | |
0f41302f MS |
309 | assigned to the reg to be eliminated. */ |
310 | rtx to_rtx; /* REG rtx for the replacement. */ | |
32131a9c RK |
311 | } reg_eliminate[] = |
312 | ||
313 | /* If a set of eliminable registers was specified, define the table from it. | |
314 | Otherwise, default to the normal case of the frame pointer being | |
315 | replaced by the stack pointer. */ | |
316 | ||
317 | #ifdef ELIMINABLE_REGS | |
318 | ELIMINABLE_REGS; | |
319 | #else | |
320 | {{ FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}; | |
321 | #endif | |
322 | ||
323 | #define NUM_ELIMINABLE_REGS (sizeof reg_eliminate / sizeof reg_eliminate[0]) | |
324 | ||
325 | /* Record the number of pending eliminations that have an offset not equal | |
326 | to their initial offset. If non-zero, we use a new copy of each | |
327 | replacement result in any insns encountered. */ | |
cb2afeb3 | 328 | int num_not_at_initial_offset; |
32131a9c RK |
329 | |
330 | /* Count the number of registers that we may be able to eliminate. */ | |
331 | static int num_eliminable; | |
332 | ||
333 | /* For each label, we record the offset of each elimination. If we reach | |
334 | a label by more than one path and an offset differs, we cannot do the | |
335 | elimination. This information is indexed by the number of the label. | |
336 | The first table is an array of flags that records whether we have yet | |
337 | encountered a label and the second table is an array of arrays, one | |
338 | entry in the latter array for each elimination. */ | |
339 | ||
340 | static char *offsets_known_at; | |
341 | static int (*offsets_at)[NUM_ELIMINABLE_REGS]; | |
342 | ||
343 | /* Number of labels in the current function. */ | |
344 | ||
345 | static int num_labels; | |
546b63fb | 346 | |
03acd8f8 BS |
347 | struct hard_reg_n_uses |
348 | { | |
349 | int regno; | |
350 | unsigned int uses; | |
351 | }; | |
32131a9c | 352 | \f |
18a90182 | 353 | static void maybe_fix_stack_asms PROTO((void)); |
03acd8f8 BS |
354 | static void calculate_needs_all_insns PROTO((int)); |
355 | static void calculate_needs PROTO((struct insn_chain *)); | |
356 | static void find_reload_regs PROTO((struct insn_chain *chain, | |
357 | FILE *)); | |
358 | static void find_tworeg_group PROTO((struct insn_chain *, int, | |
359 | FILE *)); | |
360 | static void find_group PROTO((struct insn_chain *, int, | |
361 | FILE *)); | |
362 | static int possible_group_p PROTO((struct insn_chain *, int)); | |
363 | static void count_possible_groups PROTO((struct insn_chain *, int)); | |
546b63fb RK |
364 | static int modes_equiv_for_class_p PROTO((enum machine_mode, |
365 | enum machine_mode, | |
366 | enum reg_class)); | |
7609e720 | 367 | static void delete_caller_save_insns PROTO((void)); |
03acd8f8 | 368 | |
546b63fb | 369 | static void spill_failure PROTO((rtx)); |
03acd8f8 BS |
370 | static void new_spill_reg PROTO((struct insn_chain *, int, int, |
371 | int, FILE *)); | |
372 | static void maybe_mark_pseudo_spilled PROTO((int)); | |
546b63fb RK |
373 | static void delete_dead_insn PROTO((rtx)); |
374 | static void alter_reg PROTO((int, int)); | |
375 | static void set_label_offsets PROTO((rtx, rtx, int)); | |
376 | static int eliminate_regs_in_insn PROTO((rtx, int)); | |
cb2afeb3 | 377 | static void update_eliminable_offsets PROTO((void)); |
546b63fb | 378 | static void mark_not_eliminable PROTO((rtx, rtx)); |
09dd1133 | 379 | static void set_initial_elim_offsets PROTO((void)); |
c47f5ea5 | 380 | static void verify_initial_elim_offsets PROTO((void)); |
09dd1133 BS |
381 | static void init_elim_table PROTO((void)); |
382 | static void update_eliminables PROTO((HARD_REG_SET *)); | |
03acd8f8 BS |
383 | static void spill_hard_reg PROTO((int, FILE *, int)); |
384 | static int finish_spills PROTO((int, FILE *)); | |
385 | static void ior_hard_reg_set PROTO((HARD_REG_SET *, HARD_REG_SET *)); | |
546b63fb | 386 | static void scan_paradoxical_subregs PROTO((rtx)); |
788a0818 | 387 | static int hard_reg_use_compare PROTO((const GENERIC_PTR, const GENERIC_PTR)); |
03acd8f8 BS |
388 | static void count_pseudo PROTO((struct hard_reg_n_uses *, int)); |
389 | static void order_regs_for_reload PROTO((struct insn_chain *)); | |
7609e720 | 390 | static void reload_as_needed PROTO((int)); |
9a881562 | 391 | static void forget_old_reloads_1 PROTO((rtx, rtx)); |
788a0818 | 392 | static int reload_reg_class_lower PROTO((const GENERIC_PTR, const GENERIC_PTR)); |
546b63fb RK |
393 | static void mark_reload_reg_in_use PROTO((int, int, enum reload_type, |
394 | enum machine_mode)); | |
be7ae2a4 RK |
395 | static void clear_reload_reg_in_use PROTO((int, int, enum reload_type, |
396 | enum machine_mode)); | |
546b63fb | 397 | static int reload_reg_free_p PROTO((int, int, enum reload_type)); |
6f77675f | 398 | static int reload_reg_free_before_p PROTO((int, int, enum reload_type, int)); |
f5470689 | 399 | static int reload_reg_free_for_value_p PROTO((int, int, enum reload_type, rtx, rtx, int)); |
546b63fb | 400 | static int reload_reg_reaches_end_p PROTO((int, int, enum reload_type)); |
03acd8f8 BS |
401 | static int allocate_reload_reg PROTO((struct insn_chain *, int, int, |
402 | int)); | |
403 | static void choose_reload_regs PROTO((struct insn_chain *)); | |
546b63fb | 404 | static void merge_assigned_reloads PROTO((rtx)); |
7609e720 | 405 | static void emit_reload_insns PROTO((struct insn_chain *)); |
cb2afeb3 R |
406 | static void delete_output_reload PROTO((rtx, int, int)); |
407 | static void delete_address_reloads PROTO((rtx, rtx)); | |
408 | static void delete_address_reloads_1 PROTO((rtx, rtx, rtx)); | |
409 | static rtx inc_for_reload PROTO((rtx, rtx, rtx, int)); | |
546b63fb | 410 | static int constraint_accepts_reg_p PROTO((char *, rtx)); |
5adf6da0 | 411 | static void reload_cse_regs_1 PROTO((rtx)); |
2a9fb548 | 412 | static void reload_cse_invalidate_regno PROTO((int, enum machine_mode, int)); |
cbfc3ad3 | 413 | static int reload_cse_mem_conflict_p PROTO((rtx, rtx)); |
2a9fb548 ILT |
414 | static void reload_cse_invalidate_mem PROTO((rtx)); |
415 | static void reload_cse_invalidate_rtx PROTO((rtx, rtx)); | |
2a9fb548 | 416 | static int reload_cse_regno_equal_p PROTO((int, rtx, enum machine_mode)); |
31418d35 | 417 | static int reload_cse_noop_set_p PROTO((rtx, rtx)); |
e9a25f70 JL |
418 | static int reload_cse_simplify_set PROTO((rtx, rtx)); |
419 | static int reload_cse_simplify_operands PROTO((rtx)); | |
2a9fb548 ILT |
420 | static void reload_cse_check_clobber PROTO((rtx, rtx)); |
421 | static void reload_cse_record_set PROTO((rtx, rtx)); | |
5adf6da0 R |
422 | static void reload_combine PROTO((void)); |
423 | static void reload_combine_note_use PROTO((rtx *, rtx)); | |
424 | static void reload_combine_note_store PROTO((rtx, rtx)); | |
425 | static void reload_cse_move2add PROTO((rtx)); | |
426 | static void move2add_note_store PROTO((rtx, rtx)); | |
32131a9c | 427 | \f |
546b63fb RK |
428 | /* Initialize the reload pass once per compilation. */ |
429 | ||
32131a9c RK |
430 | void |
431 | init_reload () | |
432 | { | |
433 | register int i; | |
434 | ||
435 | /* Often (MEM (REG n)) is still valid even if (REG n) is put on the stack. | |
436 | Set spill_indirect_levels to the number of levels such addressing is | |
437 | permitted, zero if it is not permitted at all. */ | |
438 | ||
439 | register rtx tem | |
38a448ca RH |
440 | = gen_rtx_MEM (Pmode, |
441 | gen_rtx_PLUS (Pmode, | |
442 | gen_rtx_REG (Pmode, LAST_VIRTUAL_REGISTER + 1), | |
443 | GEN_INT (4))); | |
32131a9c RK |
444 | spill_indirect_levels = 0; |
445 | ||
446 | while (memory_address_p (QImode, tem)) | |
447 | { | |
448 | spill_indirect_levels++; | |
38a448ca | 449 | tem = gen_rtx_MEM (Pmode, tem); |
32131a9c RK |
450 | } |
451 | ||
452 | /* See if indirect addressing is valid for (MEM (SYMBOL_REF ...)). */ | |
453 | ||
38a448ca | 454 | tem = gen_rtx_MEM (Pmode, gen_rtx_SYMBOL_REF (Pmode, "foo")); |
32131a9c RK |
455 | indirect_symref_ok = memory_address_p (QImode, tem); |
456 | ||
457 | /* See if reg+reg is a valid (and offsettable) address. */ | |
458 | ||
65701fd2 | 459 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) |
57caa638 | 460 | { |
38a448ca RH |
461 | tem = gen_rtx_PLUS (Pmode, |
462 | gen_rtx_REG (Pmode, HARD_FRAME_POINTER_REGNUM), | |
463 | gen_rtx_REG (Pmode, i)); | |
57caa638 RS |
464 | /* This way, we make sure that reg+reg is an offsettable address. */ |
465 | tem = plus_constant (tem, 4); | |
466 | ||
467 | if (memory_address_p (QImode, tem)) | |
468 | { | |
469 | double_reg_address_ok = 1; | |
470 | break; | |
471 | } | |
472 | } | |
32131a9c | 473 | |
0f41302f | 474 | /* Initialize obstack for our rtl allocation. */ |
32131a9c | 475 | gcc_obstack_init (&reload_obstack); |
cad6f7d0 | 476 | reload_startobj = (char *) obstack_alloc (&reload_obstack, 0); |
32131a9c RK |
477 | } |
478 | ||
cad6f7d0 BS |
479 | /* List of insn chains that are currently unused. */ |
480 | static struct insn_chain *unused_insn_chains = 0; | |
481 | ||
482 | /* Allocate an empty insn_chain structure. */ | |
483 | struct insn_chain * | |
484 | new_insn_chain () | |
485 | { | |
486 | struct insn_chain *c; | |
487 | ||
488 | if (unused_insn_chains == 0) | |
489 | { | |
490 | c = obstack_alloc (&reload_obstack, sizeof (struct insn_chain)); | |
491 | c->live_before = OBSTACK_ALLOC_REG_SET (&reload_obstack); | |
492 | c->live_after = OBSTACK_ALLOC_REG_SET (&reload_obstack); | |
493 | } | |
494 | else | |
495 | { | |
496 | c = unused_insn_chains; | |
497 | unused_insn_chains = c->next; | |
498 | } | |
499 | c->is_caller_save_insn = 0; | |
03acd8f8 | 500 | c->need_operand_change = 0; |
cad6f7d0 BS |
501 | c->need_reload = 0; |
502 | c->need_elim = 0; | |
503 | return c; | |
504 | } | |
505 | ||
7609e720 BS |
506 | /* Small utility function to set all regs in hard reg set TO which are |
507 | allocated to pseudos in regset FROM. */ | |
508 | void | |
509 | compute_use_by_pseudos (to, from) | |
510 | HARD_REG_SET *to; | |
511 | regset from; | |
512 | { | |
513 | int regno; | |
514 | EXECUTE_IF_SET_IN_REG_SET | |
515 | (from, FIRST_PSEUDO_REGISTER, regno, | |
516 | { | |
517 | int r = reg_renumber[regno]; | |
518 | int nregs; | |
519 | if (r < 0) | |
520 | abort (); | |
521 | nregs = HARD_REGNO_NREGS (r, PSEUDO_REGNO_MODE (regno)); | |
522 | while (nregs-- > 0) | |
523 | SET_HARD_REG_BIT (*to, r + nregs); | |
524 | }); | |
525 | } | |
03acd8f8 | 526 | \f |
1e5bd841 BS |
527 | /* Global variables used by reload and its subroutines. */ |
528 | ||
1e5bd841 BS |
529 | /* Set during calculate_needs if an insn needs register elimination. */ |
530 | static int something_needs_elimination; | |
cb2afeb3 R |
531 | /* Set during calculate_needs if an insn needs an operand changed. */ |
532 | int something_needs_operands_changed; | |
1e5bd841 | 533 | |
1e5bd841 BS |
534 | /* Nonzero means we couldn't get enough spill regs. */ |
535 | static int failure; | |
536 | ||
546b63fb | 537 | /* Main entry point for the reload pass. |
32131a9c RK |
538 | |
539 | FIRST is the first insn of the function being compiled. | |
540 | ||
541 | GLOBAL nonzero means we were called from global_alloc | |
542 | and should attempt to reallocate any pseudoregs that we | |
543 | displace from hard regs we will use for reloads. | |
544 | If GLOBAL is zero, we do not have enough information to do that, | |
545 | so any pseudo reg that is spilled must go to the stack. | |
546 | ||
547 | DUMPFILE is the global-reg debugging dump file stream, or 0. | |
548 | If it is nonzero, messages are written to it to describe | |
549 | which registers are seized as reload regs, which pseudo regs | |
5352b11a | 550 | are spilled from them, and where the pseudo regs are reallocated to. |
32131a9c | 551 | |
5352b11a RS |
552 | Return value is nonzero if reload failed |
553 | and we must not do any more for this function. */ | |
554 | ||
555 | int | |
32131a9c RK |
556 | reload (first, global, dumpfile) |
557 | rtx first; | |
558 | int global; | |
559 | FILE *dumpfile; | |
560 | { | |
03acd8f8 | 561 | register int i; |
32131a9c RK |
562 | register rtx insn; |
563 | register struct elim_table *ep; | |
564 | ||
a68d4b75 BK |
565 | /* The two pointers used to track the true location of the memory used |
566 | for label offsets. */ | |
567 | char *real_known_ptr = NULL_PTR; | |
568 | int (*real_at_ptr)[NUM_ELIMINABLE_REGS]; | |
569 | ||
32131a9c RK |
570 | /* Make sure even insns with volatile mem refs are recognizable. */ |
571 | init_recog (); | |
572 | ||
1e5bd841 BS |
573 | failure = 0; |
574 | ||
cad6f7d0 BS |
575 | reload_firstobj = (char *) obstack_alloc (&reload_obstack, 0); |
576 | ||
437a710d BS |
577 | /* Make sure that the last insn in the chain |
578 | is not something that needs reloading. */ | |
579 | emit_note (NULL_PTR, NOTE_INSN_DELETED); | |
580 | ||
32131a9c RK |
581 | /* Enable find_equiv_reg to distinguish insns made by reload. */ |
582 | reload_first_uid = get_max_uid (); | |
583 | ||
0dadecf6 RK |
584 | #ifdef SECONDARY_MEMORY_NEEDED |
585 | /* Initialize the secondary memory table. */ | |
586 | clear_secondary_mem (); | |
587 | #endif | |
588 | ||
32131a9c | 589 | /* We don't have a stack slot for any spill reg yet. */ |
4c9a05bc RK |
590 | bzero ((char *) spill_stack_slot, sizeof spill_stack_slot); |
591 | bzero ((char *) spill_stack_slot_width, sizeof spill_stack_slot_width); | |
32131a9c | 592 | |
a8efe40d RK |
593 | /* Initialize the save area information for caller-save, in case some |
594 | are needed. */ | |
595 | init_save_areas (); | |
a8fdc208 | 596 | |
32131a9c RK |
597 | /* Compute which hard registers are now in use |
598 | as homes for pseudo registers. | |
599 | This is done here rather than (eg) in global_alloc | |
600 | because this point is reached even if not optimizing. */ | |
32131a9c RK |
601 | for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++) |
602 | mark_home_live (i); | |
603 | ||
8dddd002 RK |
604 | /* A function that receives a nonlocal goto must save all call-saved |
605 | registers. */ | |
606 | if (current_function_has_nonlocal_label) | |
607 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
608 | { | |
609 | if (! call_used_regs[i] && ! fixed_regs[i]) | |
610 | regs_ever_live[i] = 1; | |
611 | } | |
612 | ||
32131a9c RK |
613 | /* Find all the pseudo registers that didn't get hard regs |
614 | but do have known equivalent constants or memory slots. | |
615 | These include parameters (known equivalent to parameter slots) | |
616 | and cse'd or loop-moved constant memory addresses. | |
617 | ||
618 | Record constant equivalents in reg_equiv_constant | |
619 | so they will be substituted by find_reloads. | |
620 | Record memory equivalents in reg_mem_equiv so they can | |
621 | be substituted eventually by altering the REG-rtx's. */ | |
622 | ||
56a65848 | 623 | reg_equiv_constant = (rtx *) xmalloc (max_regno * sizeof (rtx)); |
4c9a05bc | 624 | bzero ((char *) reg_equiv_constant, max_regno * sizeof (rtx)); |
56a65848 | 625 | reg_equiv_memory_loc = (rtx *) xmalloc (max_regno * sizeof (rtx)); |
4c9a05bc | 626 | bzero ((char *) reg_equiv_memory_loc, max_regno * sizeof (rtx)); |
56a65848 | 627 | reg_equiv_mem = (rtx *) xmalloc (max_regno * sizeof (rtx)); |
4c9a05bc | 628 | bzero ((char *) reg_equiv_mem, max_regno * sizeof (rtx)); |
56a65848 | 629 | reg_equiv_init = (rtx *) xmalloc (max_regno * sizeof (rtx)); |
4c9a05bc | 630 | bzero ((char *) reg_equiv_init, max_regno * sizeof (rtx)); |
56a65848 | 631 | reg_equiv_address = (rtx *) xmalloc (max_regno * sizeof (rtx)); |
4c9a05bc | 632 | bzero ((char *) reg_equiv_address, max_regno * sizeof (rtx)); |
56a65848 | 633 | reg_max_ref_width = (int *) xmalloc (max_regno * sizeof (int)); |
4c9a05bc | 634 | bzero ((char *) reg_max_ref_width, max_regno * sizeof (int)); |
03acd8f8 BS |
635 | reg_old_renumber = (short *) xmalloc (max_regno * sizeof (short)); |
636 | bcopy (reg_renumber, reg_old_renumber, max_regno * sizeof (short)); | |
637 | pseudo_forbidden_regs | |
638 | = (HARD_REG_SET *) xmalloc (max_regno * sizeof (HARD_REG_SET)); | |
639 | pseudo_previous_regs | |
640 | = (HARD_REG_SET *) xmalloc (max_regno * sizeof (HARD_REG_SET)); | |
32131a9c | 641 | |
03acd8f8 BS |
642 | CLEAR_HARD_REG_SET (bad_spill_regs_global); |
643 | bzero ((char *) pseudo_previous_regs, max_regno * sizeof (HARD_REG_SET)); | |
56f58d3a | 644 | |
32131a9c | 645 | /* Look for REG_EQUIV notes; record what each pseudo is equivalent to. |
56f58d3a RK |
646 | Also find all paradoxical subregs and find largest such for each pseudo. |
647 | On machines with small register classes, record hard registers that | |
b453cb0b RK |
648 | are used for user variables. These can never be used for spills. |
649 | Also look for a "constant" NOTE_INSN_SETJMP. This means that all | |
650 | caller-saved registers must be marked live. */ | |
32131a9c RK |
651 | |
652 | for (insn = first; insn; insn = NEXT_INSN (insn)) | |
653 | { | |
654 | rtx set = single_set (insn); | |
655 | ||
b453cb0b RK |
656 | if (GET_CODE (insn) == NOTE && CONST_CALL_P (insn) |
657 | && NOTE_LINE_NUMBER (insn) == NOTE_INSN_SETJMP) | |
658 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
659 | if (! call_used_regs[i]) | |
660 | regs_ever_live[i] = 1; | |
661 | ||
32131a9c RK |
662 | if (set != 0 && GET_CODE (SET_DEST (set)) == REG) |
663 | { | |
fb3821f7 | 664 | rtx note = find_reg_note (insn, REG_EQUIV, NULL_RTX); |
a8efe40d RK |
665 | if (note |
666 | #ifdef LEGITIMATE_PIC_OPERAND_P | |
a8fdc208 | 667 | && (! CONSTANT_P (XEXP (note, 0)) || ! flag_pic |
a8efe40d RK |
668 | || LEGITIMATE_PIC_OPERAND_P (XEXP (note, 0))) |
669 | #endif | |
670 | ) | |
32131a9c RK |
671 | { |
672 | rtx x = XEXP (note, 0); | |
673 | i = REGNO (SET_DEST (set)); | |
674 | if (i > LAST_VIRTUAL_REGISTER) | |
675 | { | |
676 | if (GET_CODE (x) == MEM) | |
956d6950 JL |
677 | { |
678 | /* If the operand is a PLUS, the MEM may be shared, | |
679 | so make sure we have an unshared copy here. */ | |
680 | if (GET_CODE (XEXP (x, 0)) == PLUS) | |
681 | x = copy_rtx (x); | |
682 | ||
683 | reg_equiv_memory_loc[i] = x; | |
684 | } | |
32131a9c RK |
685 | else if (CONSTANT_P (x)) |
686 | { | |
687 | if (LEGITIMATE_CONSTANT_P (x)) | |
688 | reg_equiv_constant[i] = x; | |
689 | else | |
690 | reg_equiv_memory_loc[i] | |
d445b551 | 691 | = force_const_mem (GET_MODE (SET_DEST (set)), x); |
32131a9c RK |
692 | } |
693 | else | |
694 | continue; | |
695 | ||
696 | /* If this register is being made equivalent to a MEM | |
697 | and the MEM is not SET_SRC, the equivalencing insn | |
698 | is one with the MEM as a SET_DEST and it occurs later. | |
699 | So don't mark this insn now. */ | |
700 | if (GET_CODE (x) != MEM | |
701 | || rtx_equal_p (SET_SRC (set), x)) | |
702 | reg_equiv_init[i] = insn; | |
703 | } | |
704 | } | |
705 | } | |
706 | ||
707 | /* If this insn is setting a MEM from a register equivalent to it, | |
708 | this is the equivalencing insn. */ | |
709 | else if (set && GET_CODE (SET_DEST (set)) == MEM | |
710 | && GET_CODE (SET_SRC (set)) == REG | |
711 | && reg_equiv_memory_loc[REGNO (SET_SRC (set))] | |
712 | && rtx_equal_p (SET_DEST (set), | |
713 | reg_equiv_memory_loc[REGNO (SET_SRC (set))])) | |
714 | reg_equiv_init[REGNO (SET_SRC (set))] = insn; | |
715 | ||
716 | if (GET_RTX_CLASS (GET_CODE (insn)) == 'i') | |
717 | scan_paradoxical_subregs (PATTERN (insn)); | |
718 | } | |
719 | ||
09dd1133 | 720 | init_elim_table (); |
32131a9c RK |
721 | |
722 | num_labels = max_label_num () - get_first_label_num (); | |
723 | ||
724 | /* Allocate the tables used to store offset information at labels. */ | |
a68d4b75 BK |
725 | /* We used to use alloca here, but the size of what it would try to |
726 | allocate would occasionally cause it to exceed the stack limit and | |
727 | cause a core dump. */ | |
728 | real_known_ptr = xmalloc (num_labels); | |
729 | real_at_ptr | |
32131a9c | 730 | = (int (*)[NUM_ELIMINABLE_REGS]) |
a68d4b75 | 731 | xmalloc (num_labels * NUM_ELIMINABLE_REGS * sizeof (int)); |
32131a9c | 732 | |
a68d4b75 BK |
733 | offsets_known_at = real_known_ptr - get_first_label_num (); |
734 | offsets_at | |
735 | = (int (*)[NUM_ELIMINABLE_REGS]) (real_at_ptr - get_first_label_num ()); | |
32131a9c RK |
736 | |
737 | /* Alter each pseudo-reg rtx to contain its hard reg number. | |
738 | Assign stack slots to the pseudos that lack hard regs or equivalents. | |
739 | Do not touch virtual registers. */ | |
740 | ||
741 | for (i = LAST_VIRTUAL_REGISTER + 1; i < max_regno; i++) | |
742 | alter_reg (i, -1); | |
743 | ||
32131a9c RK |
744 | /* If we have some registers we think can be eliminated, scan all insns to |
745 | see if there is an insn that sets one of these registers to something | |
746 | other than itself plus a constant. If so, the register cannot be | |
747 | eliminated. Doing this scan here eliminates an extra pass through the | |
748 | main reload loop in the most common case where register elimination | |
749 | cannot be done. */ | |
750 | for (insn = first; insn && num_eliminable; insn = NEXT_INSN (insn)) | |
751 | if (GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN | |
752 | || GET_CODE (insn) == CALL_INSN) | |
753 | note_stores (PATTERN (insn), mark_not_eliminable); | |
754 | ||
755 | #ifndef REGISTER_CONSTRAINTS | |
756 | /* If all the pseudo regs have hard regs, | |
757 | except for those that are never referenced, | |
758 | we know that no reloads are needed. */ | |
759 | /* But that is not true if there are register constraints, since | |
760 | in that case some pseudos might be in the wrong kind of hard reg. */ | |
761 | ||
762 | for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++) | |
b1f21e0a | 763 | if (reg_renumber[i] == -1 && REG_N_REFS (i) != 0) |
32131a9c RK |
764 | break; |
765 | ||
b8093d02 | 766 | if (i == max_regno && num_eliminable == 0 && ! caller_save_needed) |
a68d4b75 BK |
767 | { |
768 | free (real_known_ptr); | |
769 | free (real_at_ptr); | |
56a65848 DB |
770 | free (reg_equiv_constant); |
771 | free (reg_equiv_memory_loc); | |
772 | free (reg_equiv_mem); | |
773 | free (reg_equiv_init); | |
774 | free (reg_equiv_address); | |
775 | free (reg_max_ref_width); | |
03acd8f8 BS |
776 | free (reg_old_renumber); |
777 | free (pseudo_previous_regs); | |
778 | free (pseudo_forbidden_regs); | |
56a65848 | 779 | return 0; |
a68d4b75 | 780 | } |
32131a9c RK |
781 | #endif |
782 | ||
18a90182 BS |
783 | maybe_fix_stack_asms (); |
784 | ||
03acd8f8 BS |
785 | insns_need_reload = 0; |
786 | something_needs_elimination = 0; | |
787 | ||
4079cd63 JW |
788 | /* Initialize to -1, which means take the first spill register. */ |
789 | last_spill_reg = -1; | |
790 | ||
7609e720 BS |
791 | spilled_pseudos = ALLOCA_REG_SET (); |
792 | ||
32131a9c | 793 | /* Spill any hard regs that we know we can't eliminate. */ |
03acd8f8 | 794 | CLEAR_HARD_REG_SET (used_spill_regs); |
32131a9c RK |
795 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) |
796 | if (! ep->can_eliminate) | |
03acd8f8 | 797 | spill_hard_reg (ep->from, dumpfile, 1); |
9ff3516a RK |
798 | |
799 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
800 | if (frame_pointer_needed) | |
03acd8f8 | 801 | spill_hard_reg (HARD_FRAME_POINTER_REGNUM, dumpfile, 1); |
9ff3516a | 802 | #endif |
7609e720 BS |
803 | finish_spills (global, dumpfile); |
804 | ||
b2f15f94 RK |
805 | /* From now on, we need to emit any moves without making new pseudos. */ |
806 | reload_in_progress = 1; | |
807 | ||
32131a9c RK |
808 | /* This loop scans the entire function each go-round |
809 | and repeats until one repetition spills no additional hard regs. */ | |
03acd8f8 | 810 | for (;;) |
32131a9c | 811 | { |
03acd8f8 BS |
812 | int something_changed; |
813 | int did_spill; | |
814 | struct insn_chain *chain; | |
32131a9c | 815 | |
03acd8f8 | 816 | HOST_WIDE_INT starting_frame_size; |
32131a9c | 817 | |
7657bf2f JW |
818 | /* Round size of stack frame to BIGGEST_ALIGNMENT. This must be done |
819 | here because the stack size may be a part of the offset computation | |
820 | for register elimination, and there might have been new stack slots | |
821 | created in the last iteration of this loop. */ | |
822 | assign_stack_local (BLKmode, 0, 0); | |
823 | ||
824 | starting_frame_size = get_frame_size (); | |
825 | ||
09dd1133 | 826 | set_initial_elim_offsets (); |
03acd8f8 | 827 | |
32131a9c RK |
828 | /* For each pseudo register that has an equivalent location defined, |
829 | try to eliminate any eliminable registers (such as the frame pointer) | |
830 | assuming initial offsets for the replacement register, which | |
831 | is the normal case. | |
832 | ||
833 | If the resulting location is directly addressable, substitute | |
834 | the MEM we just got directly for the old REG. | |
835 | ||
836 | If it is not addressable but is a constant or the sum of a hard reg | |
837 | and constant, it is probably not addressable because the constant is | |
838 | out of range, in that case record the address; we will generate | |
839 | hairy code to compute the address in a register each time it is | |
6491dbbb RK |
840 | needed. Similarly if it is a hard register, but one that is not |
841 | valid as an address register. | |
32131a9c RK |
842 | |
843 | If the location is not addressable, but does not have one of the | |
844 | above forms, assign a stack slot. We have to do this to avoid the | |
845 | potential of producing lots of reloads if, e.g., a location involves | |
846 | a pseudo that didn't get a hard register and has an equivalent memory | |
847 | location that also involves a pseudo that didn't get a hard register. | |
848 | ||
849 | Perhaps at some point we will improve reload_when_needed handling | |
850 | so this problem goes away. But that's very hairy. */ | |
851 | ||
852 | for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++) | |
853 | if (reg_renumber[i] < 0 && reg_equiv_memory_loc[i]) | |
854 | { | |
1914f5da | 855 | rtx x = eliminate_regs (reg_equiv_memory_loc[i], 0, NULL_RTX); |
32131a9c RK |
856 | |
857 | if (strict_memory_address_p (GET_MODE (regno_reg_rtx[i]), | |
858 | XEXP (x, 0))) | |
859 | reg_equiv_mem[i] = x, reg_equiv_address[i] = 0; | |
860 | else if (CONSTANT_P (XEXP (x, 0)) | |
6491dbbb RK |
861 | || (GET_CODE (XEXP (x, 0)) == REG |
862 | && REGNO (XEXP (x, 0)) < FIRST_PSEUDO_REGISTER) | |
32131a9c RK |
863 | || (GET_CODE (XEXP (x, 0)) == PLUS |
864 | && GET_CODE (XEXP (XEXP (x, 0), 0)) == REG | |
865 | && (REGNO (XEXP (XEXP (x, 0), 0)) | |
866 | < FIRST_PSEUDO_REGISTER) | |
867 | && CONSTANT_P (XEXP (XEXP (x, 0), 1)))) | |
868 | reg_equiv_address[i] = XEXP (x, 0), reg_equiv_mem[i] = 0; | |
869 | else | |
870 | { | |
871 | /* Make a new stack slot. Then indicate that something | |
a8fdc208 | 872 | changed so we go back and recompute offsets for |
32131a9c RK |
873 | eliminable registers because the allocation of memory |
874 | below might change some offset. reg_equiv_{mem,address} | |
875 | will be set up for this pseudo on the next pass around | |
876 | the loop. */ | |
877 | reg_equiv_memory_loc[i] = 0; | |
878 | reg_equiv_init[i] = 0; | |
879 | alter_reg (i, -1); | |
32131a9c RK |
880 | } |
881 | } | |
a8fdc208 | 882 | |
437a710d BS |
883 | if (caller_save_needed) |
884 | setup_save_areas (); | |
885 | ||
03acd8f8 | 886 | /* If we allocated another stack slot, redo elimination bookkeeping. */ |
437a710d | 887 | if (starting_frame_size != get_frame_size ()) |
32131a9c RK |
888 | continue; |
889 | ||
437a710d | 890 | if (caller_save_needed) |
a8efe40d | 891 | { |
437a710d BS |
892 | save_call_clobbered_regs (); |
893 | /* That might have allocated new insn_chain structures. */ | |
894 | reload_firstobj = (char *) obstack_alloc (&reload_obstack, 0); | |
a8efe40d RK |
895 | } |
896 | ||
03acd8f8 BS |
897 | calculate_needs_all_insns (global); |
898 | ||
899 | CLEAR_REG_SET (spilled_pseudos); | |
900 | did_spill = 0; | |
901 | ||
902 | something_changed = 0; | |
32131a9c | 903 | |
0dadecf6 RK |
904 | /* If we allocated any new memory locations, make another pass |
905 | since it might have changed elimination offsets. */ | |
906 | if (starting_frame_size != get_frame_size ()) | |
907 | something_changed = 1; | |
908 | ||
09dd1133 BS |
909 | { |
910 | HARD_REG_SET to_spill; | |
911 | CLEAR_HARD_REG_SET (to_spill); | |
912 | update_eliminables (&to_spill); | |
913 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
914 | if (TEST_HARD_REG_BIT (to_spill, i)) | |
32131a9c | 915 | { |
03acd8f8 BS |
916 | spill_hard_reg (i, dumpfile, 1); |
917 | did_spill = 1; | |
32131a9c | 918 | } |
09dd1133 | 919 | } |
9ff3516a | 920 | |
03acd8f8 BS |
921 | CLEAR_HARD_REG_SET (used_spill_regs); |
922 | /* Try to satisfy the needs for each insn. */ | |
923 | for (chain = insns_need_reload; chain != 0; | |
924 | chain = chain->next_need_reload) | |
925 | find_reload_regs (chain, dumpfile); | |
32131a9c | 926 | |
1e5bd841 BS |
927 | if (failure) |
928 | goto failed; | |
437a710d | 929 | |
03acd8f8 BS |
930 | if (insns_need_reload != 0 || did_spill) |
931 | something_changed |= finish_spills (global, dumpfile); | |
7609e720 | 932 | |
03acd8f8 BS |
933 | if (! something_changed) |
934 | break; | |
935 | ||
936 | if (caller_save_needed) | |
7609e720 | 937 | delete_caller_save_insns (); |
32131a9c RK |
938 | } |
939 | ||
940 | /* If global-alloc was run, notify it of any register eliminations we have | |
941 | done. */ | |
942 | if (global) | |
943 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) | |
944 | if (ep->can_eliminate) | |
945 | mark_elimination (ep->from, ep->to); | |
946 | ||
32131a9c RK |
947 | /* If a pseudo has no hard reg, delete the insns that made the equivalence. |
948 | If that insn didn't set the register (i.e., it copied the register to | |
949 | memory), just delete that insn instead of the equivalencing insn plus | |
950 | anything now dead. If we call delete_dead_insn on that insn, we may | |
951 | delete the insn that actually sets the register if the register die | |
952 | there and that is incorrect. */ | |
953 | ||
954 | for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++) | |
955 | if (reg_renumber[i] < 0 && reg_equiv_init[i] != 0 | |
956 | && GET_CODE (reg_equiv_init[i]) != NOTE) | |
957 | { | |
958 | if (reg_set_p (regno_reg_rtx[i], PATTERN (reg_equiv_init[i]))) | |
959 | delete_dead_insn (reg_equiv_init[i]); | |
960 | else | |
961 | { | |
962 | PUT_CODE (reg_equiv_init[i], NOTE); | |
963 | NOTE_SOURCE_FILE (reg_equiv_init[i]) = 0; | |
964 | NOTE_LINE_NUMBER (reg_equiv_init[i]) = NOTE_INSN_DELETED; | |
965 | } | |
966 | } | |
967 | ||
968 | /* Use the reload registers where necessary | |
969 | by generating move instructions to move the must-be-register | |
970 | values into or out of the reload registers. */ | |
971 | ||
03acd8f8 BS |
972 | if (insns_need_reload != 0 || something_needs_elimination |
973 | || something_needs_operands_changed) | |
c47f5ea5 BS |
974 | { |
975 | int old_frame_size = get_frame_size (); | |
976 | ||
977 | reload_as_needed (global); | |
978 | ||
979 | if (old_frame_size != get_frame_size ()) | |
980 | abort (); | |
981 | ||
982 | if (num_eliminable) | |
983 | verify_initial_elim_offsets (); | |
984 | } | |
32131a9c | 985 | |
2a1f8b6b | 986 | /* If we were able to eliminate the frame pointer, show that it is no |
546b63fb | 987 | longer live at the start of any basic block. If it ls live by |
2a1f8b6b RK |
988 | virtue of being in a pseudo, that pseudo will be marked live |
989 | and hence the frame pointer will be known to be live via that | |
990 | pseudo. */ | |
991 | ||
992 | if (! frame_pointer_needed) | |
993 | for (i = 0; i < n_basic_blocks; i++) | |
8e08106d MM |
994 | CLEAR_REGNO_REG_SET (basic_block_live_at_start[i], |
995 | HARD_FRAME_POINTER_REGNUM); | |
2a1f8b6b | 996 | |
5352b11a RS |
997 | /* Come here (with failure set nonzero) if we can't get enough spill regs |
998 | and we decide not to abort about it. */ | |
999 | failed: | |
1000 | ||
a3ec87a8 RS |
1001 | reload_in_progress = 0; |
1002 | ||
32131a9c RK |
1003 | /* Now eliminate all pseudo regs by modifying them into |
1004 | their equivalent memory references. | |
1005 | The REG-rtx's for the pseudos are modified in place, | |
1006 | so all insns that used to refer to them now refer to memory. | |
1007 | ||
1008 | For a reg that has a reg_equiv_address, all those insns | |
1009 | were changed by reloading so that no insns refer to it any longer; | |
1010 | but the DECL_RTL of a variable decl may refer to it, | |
1011 | and if so this causes the debugging info to mention the variable. */ | |
1012 | ||
1013 | for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++) | |
1014 | { | |
1015 | rtx addr = 0; | |
ab1fd483 | 1016 | int in_struct = 0; |
9ec36da5 JL |
1017 | int is_readonly = 0; |
1018 | ||
1019 | if (reg_equiv_memory_loc[i]) | |
ab1fd483 | 1020 | { |
9ec36da5 JL |
1021 | in_struct = MEM_IN_STRUCT_P (reg_equiv_memory_loc[i]); |
1022 | is_readonly = RTX_UNCHANGING_P (reg_equiv_memory_loc[i]); | |
ab1fd483 | 1023 | } |
9ec36da5 JL |
1024 | |
1025 | if (reg_equiv_mem[i]) | |
1026 | addr = XEXP (reg_equiv_mem[i], 0); | |
1027 | ||
32131a9c RK |
1028 | if (reg_equiv_address[i]) |
1029 | addr = reg_equiv_address[i]; | |
9ec36da5 | 1030 | |
32131a9c RK |
1031 | if (addr) |
1032 | { | |
1033 | if (reg_renumber[i] < 0) | |
1034 | { | |
1035 | rtx reg = regno_reg_rtx[i]; | |
1036 | XEXP (reg, 0) = addr; | |
1037 | REG_USERVAR_P (reg) = 0; | |
9ec36da5 | 1038 | RTX_UNCHANGING_P (reg) = is_readonly; |
ab1fd483 | 1039 | MEM_IN_STRUCT_P (reg) = in_struct; |
41472af8 MM |
1040 | /* We have no alias information about this newly created |
1041 | MEM. */ | |
1042 | MEM_ALIAS_SET (reg) = 0; | |
32131a9c RK |
1043 | PUT_CODE (reg, MEM); |
1044 | } | |
1045 | else if (reg_equiv_mem[i]) | |
1046 | XEXP (reg_equiv_mem[i], 0) = addr; | |
1047 | } | |
1048 | } | |
1049 | ||
b60a8416 | 1050 | /* Make a pass over all the insns and delete all USEs which we inserted |
0304f787 JL |
1051 | only to tag a REG_EQUAL note on them. Remove all REG_DEAD and REG_UNUSED |
1052 | notes. Delete all CLOBBER insns and simplify (subreg (reg)) operands. */ | |
32131a9c RK |
1053 | |
1054 | for (insn = first; insn; insn = NEXT_INSN (insn)) | |
1055 | if (GET_RTX_CLASS (GET_CODE (insn)) == 'i') | |
1056 | { | |
6764d250 | 1057 | rtx *pnote; |
32131a9c | 1058 | |
0304f787 JL |
1059 | if ((GET_CODE (PATTERN (insn)) == USE |
1060 | && find_reg_note (insn, REG_EQUAL, NULL_RTX)) | |
1061 | || GET_CODE (PATTERN (insn)) == CLOBBER) | |
b60a8416 R |
1062 | { |
1063 | PUT_CODE (insn, NOTE); | |
1064 | NOTE_SOURCE_FILE (insn) = 0; | |
1065 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
1066 | continue; | |
1067 | } | |
6764d250 BS |
1068 | |
1069 | pnote = ®_NOTES (insn); | |
1070 | while (*pnote != 0) | |
32131a9c | 1071 | { |
6764d250 BS |
1072 | if (REG_NOTE_KIND (*pnote) == REG_DEAD |
1073 | || REG_NOTE_KIND (*pnote) == REG_UNUSED) | |
1074 | *pnote = XEXP (*pnote, 1); | |
1075 | else | |
1076 | pnote = &XEXP (*pnote, 1); | |
32131a9c | 1077 | } |
0304f787 JL |
1078 | |
1079 | /* And simplify (subreg (reg)) if it appears as an operand. */ | |
1080 | cleanup_subreg_operands (insn); | |
b60a8416 | 1081 | } |
32131a9c | 1082 | |
76e0d211 RK |
1083 | /* If we are doing stack checking, give a warning if this function's |
1084 | frame size is larger than we expect. */ | |
1085 | if (flag_stack_check && ! STACK_CHECK_BUILTIN) | |
1086 | { | |
1087 | HOST_WIDE_INT size = get_frame_size () + STACK_CHECK_FIXED_FRAME_SIZE; | |
1088 | ||
1089 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
1090 | if (regs_ever_live[i] && ! fixed_regs[i] && call_used_regs[i]) | |
1091 | size += UNITS_PER_WORD; | |
1092 | ||
1093 | if (size > STACK_CHECK_MAX_FRAME_SIZE) | |
1094 | warning ("frame size too large for reliable stack checking"); | |
1095 | } | |
cad6f7d0 | 1096 | |
32131a9c | 1097 | /* Indicate that we no longer have known memory locations or constants. */ |
58d9f9d9 JL |
1098 | if (reg_equiv_constant) |
1099 | free (reg_equiv_constant); | |
32131a9c | 1100 | reg_equiv_constant = 0; |
58d9f9d9 JL |
1101 | if (reg_equiv_memory_loc) |
1102 | free (reg_equiv_memory_loc); | |
32131a9c | 1103 | reg_equiv_memory_loc = 0; |
5352b11a | 1104 | |
a68d4b75 BK |
1105 | if (real_known_ptr) |
1106 | free (real_known_ptr); | |
1107 | if (real_at_ptr) | |
1108 | free (real_at_ptr); | |
1109 | ||
56a65848 DB |
1110 | free (reg_equiv_mem); |
1111 | free (reg_equiv_init); | |
1112 | free (reg_equiv_address); | |
1113 | free (reg_max_ref_width); | |
03acd8f8 BS |
1114 | free (reg_old_renumber); |
1115 | free (pseudo_previous_regs); | |
1116 | free (pseudo_forbidden_regs); | |
56a65848 | 1117 | |
7609e720 BS |
1118 | FREE_REG_SET (spilled_pseudos); |
1119 | ||
8b4f9969 JW |
1120 | CLEAR_HARD_REG_SET (used_spill_regs); |
1121 | for (i = 0; i < n_spills; i++) | |
1122 | SET_HARD_REG_BIT (used_spill_regs, spill_regs[i]); | |
1123 | ||
7609e720 BS |
1124 | /* Free all the insn_chain structures at once. */ |
1125 | obstack_free (&reload_obstack, reload_startobj); | |
1126 | unused_insn_chains = 0; | |
1127 | ||
5352b11a | 1128 | return failure; |
32131a9c | 1129 | } |
1e5bd841 | 1130 | |
18a90182 BS |
1131 | /* Yet another special case. Unfortunately, reg-stack forces people to |
1132 | write incorrect clobbers in asm statements. These clobbers must not | |
1133 | cause the register to appear in bad_spill_regs, otherwise we'll call | |
1134 | fatal_insn later. We clear the corresponding regnos in the live | |
1135 | register sets to avoid this. | |
1136 | The whole thing is rather sick, I'm afraid. */ | |
1137 | static void | |
1138 | maybe_fix_stack_asms () | |
1139 | { | |
1140 | #ifdef STACK_REGS | |
1141 | char *constraints[MAX_RECOG_OPERANDS]; | |
1142 | enum machine_mode operand_mode[MAX_RECOG_OPERANDS]; | |
1143 | struct insn_chain *chain; | |
1144 | ||
1145 | for (chain = reload_insn_chain; chain != 0; chain = chain->next) | |
1146 | { | |
1147 | int i, noperands; | |
1148 | HARD_REG_SET clobbered, allowed; | |
1149 | rtx pat; | |
1150 | ||
1151 | if (GET_RTX_CLASS (GET_CODE (chain->insn)) != 'i' | |
1152 | || (noperands = asm_noperands (PATTERN (chain->insn))) < 0) | |
1153 | continue; | |
1154 | pat = PATTERN (chain->insn); | |
1155 | if (GET_CODE (pat) != PARALLEL) | |
1156 | continue; | |
1157 | ||
1158 | CLEAR_HARD_REG_SET (clobbered); | |
1159 | CLEAR_HARD_REG_SET (allowed); | |
1160 | ||
1161 | /* First, make a mask of all stack regs that are clobbered. */ | |
1162 | for (i = 0; i < XVECLEN (pat, 0); i++) | |
1163 | { | |
1164 | rtx t = XVECEXP (pat, 0, i); | |
1165 | if (GET_CODE (t) == CLOBBER && STACK_REG_P (XEXP (t, 0))) | |
1166 | SET_HARD_REG_BIT (clobbered, REGNO (XEXP (t, 0))); | |
1167 | } | |
1168 | ||
1169 | /* Get the operand values and constraints out of the insn. */ | |
1170 | decode_asm_operands (pat, recog_operand, recog_operand_loc, | |
1171 | constraints, operand_mode); | |
1172 | ||
1173 | /* For every operand, see what registers are allowed. */ | |
1174 | for (i = 0; i < noperands; i++) | |
1175 | { | |
1176 | char *p = constraints[i]; | |
1177 | /* For every alternative, we compute the class of registers allowed | |
1178 | for reloading in CLS, and merge its contents into the reg set | |
1179 | ALLOWED. */ | |
1180 | int cls = (int) NO_REGS; | |
1181 | ||
1182 | for (;;) | |
1183 | { | |
1184 | char c = *p++; | |
1185 | ||
1186 | if (c == '\0' || c == ',' || c == '#') | |
1187 | { | |
1188 | /* End of one alternative - mark the regs in the current | |
1189 | class, and reset the class. */ | |
1190 | IOR_HARD_REG_SET (allowed, reg_class_contents[cls]); | |
1191 | cls = NO_REGS; | |
1192 | if (c == '#') | |
1193 | do { | |
1194 | c = *p++; | |
1195 | } while (c != '\0' && c != ','); | |
1196 | if (c == '\0') | |
1197 | break; | |
1198 | continue; | |
1199 | } | |
1200 | ||
1201 | switch (c) | |
1202 | { | |
1203 | case '=': case '+': case '*': case '%': case '?': case '!': | |
1204 | case '0': case '1': case '2': case '3': case '4': case 'm': | |
1205 | case '<': case '>': case 'V': case 'o': case '&': case 'E': | |
1206 | case 'F': case 's': case 'i': case 'n': case 'X': case 'I': | |
1207 | case 'J': case 'K': case 'L': case 'M': case 'N': case 'O': | |
1208 | case 'P': | |
1209 | #ifdef EXTRA_CONSTRAINT | |
1210 | case 'Q': case 'R': case 'S': case 'T': case 'U': | |
1211 | #endif | |
1212 | break; | |
1213 | ||
1214 | case 'p': | |
1215 | cls = (int) reg_class_subunion[cls][(int) BASE_REG_CLASS]; | |
1216 | break; | |
1217 | ||
1218 | case 'g': | |
1219 | case 'r': | |
1220 | cls = (int) reg_class_subunion[cls][(int) GENERAL_REGS]; | |
1221 | break; | |
1222 | ||
1223 | default: | |
1224 | cls = (int) reg_class_subunion[cls][(int) REG_CLASS_FROM_LETTER (c)]; | |
1225 | ||
1226 | } | |
1227 | } | |
1228 | } | |
1229 | /* Those of the registers which are clobbered, but allowed by the | |
1230 | constraints, must be usable as reload registers. So clear them | |
1231 | out of the life information. */ | |
1232 | AND_HARD_REG_SET (allowed, clobbered); | |
1233 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
1234 | if (TEST_HARD_REG_BIT (allowed, i)) | |
1235 | { | |
1236 | CLEAR_REGNO_REG_SET (chain->live_before, i); | |
1237 | CLEAR_REGNO_REG_SET (chain->live_after, i); | |
1238 | } | |
1239 | } | |
1240 | ||
1241 | #endif | |
1242 | } | |
1243 | ||
03acd8f8 BS |
1244 | \f |
1245 | /* Walk the chain of insns, and determine for each whether it needs reloads | |
1246 | and/or eliminations. Build the corresponding insns_need_reload list, and | |
1247 | set something_needs_elimination as appropriate. */ | |
1248 | static void | |
7609e720 | 1249 | calculate_needs_all_insns (global) |
1e5bd841 BS |
1250 | int global; |
1251 | { | |
7609e720 | 1252 | struct insn_chain **pprev_reload = &insns_need_reload; |
03acd8f8 | 1253 | struct insn_chain **pchain; |
1e5bd841 | 1254 | |
03acd8f8 BS |
1255 | something_needs_elimination = 0; |
1256 | ||
1257 | for (pchain = &reload_insn_chain; *pchain != 0; pchain = &(*pchain)->next) | |
1e5bd841 | 1258 | { |
03acd8f8 BS |
1259 | rtx insn; |
1260 | struct insn_chain *chain; | |
1261 | ||
1262 | chain = *pchain; | |
1263 | insn = chain->insn; | |
1e5bd841 | 1264 | |
03acd8f8 BS |
1265 | /* If this is a label, a JUMP_INSN, or has REG_NOTES (which might |
1266 | include REG_LABEL), we need to see what effects this has on the | |
1267 | known offsets at labels. */ | |
1e5bd841 BS |
1268 | |
1269 | if (GET_CODE (insn) == CODE_LABEL || GET_CODE (insn) == JUMP_INSN | |
1270 | || (GET_RTX_CLASS (GET_CODE (insn)) == 'i' | |
1271 | && REG_NOTES (insn) != 0)) | |
1272 | set_label_offsets (insn, insn, 0); | |
1273 | ||
1274 | if (GET_RTX_CLASS (GET_CODE (insn)) == 'i') | |
1275 | { | |
1276 | rtx old_body = PATTERN (insn); | |
1277 | int old_code = INSN_CODE (insn); | |
1278 | rtx old_notes = REG_NOTES (insn); | |
1279 | int did_elimination = 0; | |
cb2afeb3 | 1280 | int operands_changed = 0; |
1e5bd841 | 1281 | |
1e5bd841 BS |
1282 | /* If needed, eliminate any eliminable registers. */ |
1283 | if (num_eliminable) | |
1284 | did_elimination = eliminate_regs_in_insn (insn, 0); | |
1285 | ||
1286 | /* Analyze the instruction. */ | |
cb2afeb3 R |
1287 | operands_changed = find_reloads (insn, 0, spill_indirect_levels, |
1288 | global, spill_reg_order); | |
1289 | ||
1290 | /* If a no-op set needs more than one reload, this is likely | |
1291 | to be something that needs input address reloads. We | |
1292 | can't get rid of this cleanly later, and it is of no use | |
1293 | anyway, so discard it now. | |
1294 | We only do this when expensive_optimizations is enabled, | |
1295 | since this complements reload inheritance / output | |
1296 | reload deletion, and it can make debugging harder. */ | |
1297 | if (flag_expensive_optimizations && n_reloads > 1) | |
1298 | { | |
1299 | rtx set = single_set (insn); | |
1300 | if (set | |
1301 | && SET_SRC (set) == SET_DEST (set) | |
1302 | && GET_CODE (SET_SRC (set)) == REG | |
1303 | && REGNO (SET_SRC (set)) >= FIRST_PSEUDO_REGISTER) | |
1304 | { | |
1305 | PUT_CODE (insn, NOTE); | |
1306 | NOTE_SOURCE_FILE (insn) = 0; | |
1307 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
1308 | continue; | |
1309 | } | |
1310 | } | |
1311 | if (num_eliminable) | |
1312 | update_eliminable_offsets (); | |
1e5bd841 BS |
1313 | |
1314 | /* Remember for later shortcuts which insns had any reloads or | |
7609e720 BS |
1315 | register eliminations. */ |
1316 | chain->need_elim = did_elimination; | |
03acd8f8 BS |
1317 | chain->need_reload = n_reloads > 0; |
1318 | chain->need_operand_change = operands_changed; | |
1e5bd841 BS |
1319 | |
1320 | /* Discard any register replacements done. */ | |
1321 | if (did_elimination) | |
1322 | { | |
1323 | obstack_free (&reload_obstack, reload_firstobj); | |
1324 | PATTERN (insn) = old_body; | |
1325 | INSN_CODE (insn) = old_code; | |
1326 | REG_NOTES (insn) = old_notes; | |
1327 | something_needs_elimination = 1; | |
1328 | } | |
1329 | ||
cb2afeb3 R |
1330 | something_needs_operands_changed |= operands_changed; |
1331 | ||
437a710d | 1332 | if (n_reloads != 0) |
7609e720 BS |
1333 | { |
1334 | *pprev_reload = chain; | |
1335 | pprev_reload = &chain->next_need_reload; | |
03acd8f8 BS |
1336 | |
1337 | calculate_needs (chain); | |
7609e720 | 1338 | } |
1e5bd841 | 1339 | } |
1e5bd841 | 1340 | } |
7609e720 | 1341 | *pprev_reload = 0; |
1e5bd841 BS |
1342 | } |
1343 | ||
03acd8f8 BS |
1344 | /* Compute the most additional registers needed by one instruction, |
1345 | given by CHAIN. Collect information separately for each class of regs. | |
1346 | ||
1347 | To compute the number of reload registers of each class needed for an | |
1348 | insn, we must simulate what choose_reload_regs can do. We do this by | |
1349 | splitting an insn into an "input" and an "output" part. RELOAD_OTHER | |
1350 | reloads are used in both. The input part uses those reloads, | |
1351 | RELOAD_FOR_INPUT reloads, which must be live over the entire input section | |
1352 | of reloads, and the maximum of all the RELOAD_FOR_INPUT_ADDRESS and | |
1353 | RELOAD_FOR_OPERAND_ADDRESS reloads, which conflict with the inputs. | |
1354 | ||
1355 | The registers needed for output are RELOAD_OTHER and RELOAD_FOR_OUTPUT, | |
1356 | which are live for the entire output portion, and the maximum of all the | |
1357 | RELOAD_FOR_OUTPUT_ADDRESS reloads for each operand. | |
1e5bd841 BS |
1358 | |
1359 | The total number of registers needed is the maximum of the | |
1360 | inputs and outputs. */ | |
1361 | ||
03acd8f8 BS |
1362 | static void |
1363 | calculate_needs (chain) | |
7609e720 | 1364 | struct insn_chain *chain; |
1e5bd841 | 1365 | { |
1e5bd841 BS |
1366 | int i; |
1367 | ||
1e5bd841 BS |
1368 | /* Each `struct needs' corresponds to one RELOAD_... type. */ |
1369 | struct { | |
1370 | struct needs other; | |
1371 | struct needs input; | |
1372 | struct needs output; | |
1373 | struct needs insn; | |
1374 | struct needs other_addr; | |
1375 | struct needs op_addr; | |
1376 | struct needs op_addr_reload; | |
1377 | struct needs in_addr[MAX_RECOG_OPERANDS]; | |
1378 | struct needs in_addr_addr[MAX_RECOG_OPERANDS]; | |
1379 | struct needs out_addr[MAX_RECOG_OPERANDS]; | |
1380 | struct needs out_addr_addr[MAX_RECOG_OPERANDS]; | |
1381 | } insn_needs; | |
1382 | ||
03acd8f8 BS |
1383 | bzero ((char *) chain->group_size, sizeof chain->group_size); |
1384 | for (i = 0; i < N_REG_CLASSES; i++) | |
1385 | chain->group_mode[i] = VOIDmode; | |
1e5bd841 BS |
1386 | bzero ((char *) &insn_needs, sizeof insn_needs); |
1387 | ||
1388 | /* Count each reload once in every class | |
1389 | containing the reload's own class. */ | |
1390 | ||
1391 | for (i = 0; i < n_reloads; i++) | |
1392 | { | |
1393 | register enum reg_class *p; | |
1394 | enum reg_class class = reload_reg_class[i]; | |
1395 | int size; | |
1396 | enum machine_mode mode; | |
1397 | struct needs *this_needs; | |
1398 | ||
1399 | /* Don't count the dummy reloads, for which one of the | |
1400 | regs mentioned in the insn can be used for reloading. | |
1401 | Don't count optional reloads. | |
1402 | Don't count reloads that got combined with others. */ | |
1403 | if (reload_reg_rtx[i] != 0 | |
1404 | || reload_optional[i] != 0 | |
1405 | || (reload_out[i] == 0 && reload_in[i] == 0 | |
1406 | && ! reload_secondary_p[i])) | |
1407 | continue; | |
1408 | ||
1e5bd841 BS |
1409 | mode = reload_inmode[i]; |
1410 | if (GET_MODE_SIZE (reload_outmode[i]) > GET_MODE_SIZE (mode)) | |
1411 | mode = reload_outmode[i]; | |
1412 | size = CLASS_MAX_NREGS (class, mode); | |
1413 | ||
1414 | /* Decide which time-of-use to count this reload for. */ | |
1415 | switch (reload_when_needed[i]) | |
1416 | { | |
1417 | case RELOAD_OTHER: | |
1418 | this_needs = &insn_needs.other; | |
1419 | break; | |
1420 | case RELOAD_FOR_INPUT: | |
1421 | this_needs = &insn_needs.input; | |
1422 | break; | |
1423 | case RELOAD_FOR_OUTPUT: | |
1424 | this_needs = &insn_needs.output; | |
1425 | break; | |
1426 | case RELOAD_FOR_INSN: | |
1427 | this_needs = &insn_needs.insn; | |
1428 | break; | |
1429 | case RELOAD_FOR_OTHER_ADDRESS: | |
1430 | this_needs = &insn_needs.other_addr; | |
1431 | break; | |
1432 | case RELOAD_FOR_INPUT_ADDRESS: | |
1433 | this_needs = &insn_needs.in_addr[reload_opnum[i]]; | |
1434 | break; | |
1435 | case RELOAD_FOR_INPADDR_ADDRESS: | |
1436 | this_needs = &insn_needs.in_addr_addr[reload_opnum[i]]; | |
1437 | break; | |
1438 | case RELOAD_FOR_OUTPUT_ADDRESS: | |
1439 | this_needs = &insn_needs.out_addr[reload_opnum[i]]; | |
1440 | break; | |
1441 | case RELOAD_FOR_OUTADDR_ADDRESS: | |
1442 | this_needs = &insn_needs.out_addr_addr[reload_opnum[i]]; | |
1443 | break; | |
1444 | case RELOAD_FOR_OPERAND_ADDRESS: | |
1445 | this_needs = &insn_needs.op_addr; | |
1446 | break; | |
1447 | case RELOAD_FOR_OPADDR_ADDR: | |
1448 | this_needs = &insn_needs.op_addr_reload; | |
1449 | break; | |
1450 | } | |
1451 | ||
1452 | if (size > 1) | |
1453 | { | |
1454 | enum machine_mode other_mode, allocate_mode; | |
1455 | ||
1456 | /* Count number of groups needed separately from | |
1457 | number of individual regs needed. */ | |
1458 | this_needs->groups[(int) class]++; | |
1459 | p = reg_class_superclasses[(int) class]; | |
1460 | while (*p != LIM_REG_CLASSES) | |
1461 | this_needs->groups[(int) *p++]++; | |
1462 | ||
1463 | /* Record size and mode of a group of this class. */ | |
1464 | /* If more than one size group is needed, | |
1465 | make all groups the largest needed size. */ | |
03acd8f8 | 1466 | if (chain->group_size[(int) class] < size) |
1e5bd841 | 1467 | { |
03acd8f8 | 1468 | other_mode = chain->group_mode[(int) class]; |
1e5bd841 BS |
1469 | allocate_mode = mode; |
1470 | ||
03acd8f8 BS |
1471 | chain->group_size[(int) class] = size; |
1472 | chain->group_mode[(int) class] = mode; | |
1e5bd841 BS |
1473 | } |
1474 | else | |
1475 | { | |
1476 | other_mode = mode; | |
03acd8f8 | 1477 | allocate_mode = chain->group_mode[(int) class]; |
1e5bd841 BS |
1478 | } |
1479 | ||
1480 | /* Crash if two dissimilar machine modes both need | |
1481 | groups of consecutive regs of the same class. */ | |
1482 | ||
1483 | if (other_mode != VOIDmode && other_mode != allocate_mode | |
1484 | && ! modes_equiv_for_class_p (allocate_mode, | |
1485 | other_mode, class)) | |
1486 | fatal_insn ("Two dissimilar machine modes both need groups of consecutive regs of the same class", | |
03acd8f8 | 1487 | chain->insn); |
1e5bd841 BS |
1488 | } |
1489 | else if (size == 1) | |
1490 | { | |
e51712db | 1491 | this_needs->regs[(unsigned char)reload_nongroup[i]][(int) class] += 1; |
1e5bd841 BS |
1492 | p = reg_class_superclasses[(int) class]; |
1493 | while (*p != LIM_REG_CLASSES) | |
e51712db | 1494 | this_needs->regs[(unsigned char)reload_nongroup[i]][(int) *p++] += 1; |
1e5bd841 BS |
1495 | } |
1496 | else | |
1497 | abort (); | |
1498 | } | |
1499 | ||
1500 | /* All reloads have been counted for this insn; | |
1501 | now merge the various times of use. | |
1502 | This sets insn_needs, etc., to the maximum total number | |
1503 | of registers needed at any point in this insn. */ | |
1504 | ||
1505 | for (i = 0; i < N_REG_CLASSES; i++) | |
1506 | { | |
1507 | int j, in_max, out_max; | |
1508 | ||
1509 | /* Compute normal and nongroup needs. */ | |
1510 | for (j = 0; j <= 1; j++) | |
1511 | { | |
1512 | int k; | |
1513 | for (in_max = 0, out_max = 0, k = 0; k < reload_n_operands; k++) | |
1514 | { | |
1515 | in_max = MAX (in_max, | |
1516 | (insn_needs.in_addr[k].regs[j][i] | |
1517 | + insn_needs.in_addr_addr[k].regs[j][i])); | |
1518 | out_max = MAX (out_max, insn_needs.out_addr[k].regs[j][i]); | |
1519 | out_max = MAX (out_max, | |
1520 | insn_needs.out_addr_addr[k].regs[j][i]); | |
1521 | } | |
1522 | ||
1523 | /* RELOAD_FOR_INSN reloads conflict with inputs, outputs, | |
1524 | and operand addresses but not things used to reload | |
1525 | them. Similarly, RELOAD_FOR_OPERAND_ADDRESS reloads | |
1526 | don't conflict with things needed to reload inputs or | |
1527 | outputs. */ | |
1528 | ||
1529 | in_max = MAX (MAX (insn_needs.op_addr.regs[j][i], | |
1530 | insn_needs.op_addr_reload.regs[j][i]), | |
1531 | in_max); | |
1532 | ||
1533 | out_max = MAX (out_max, insn_needs.insn.regs[j][i]); | |
1534 | ||
1535 | insn_needs.input.regs[j][i] | |
1536 | = MAX (insn_needs.input.regs[j][i] | |
1537 | + insn_needs.op_addr.regs[j][i] | |
1538 | + insn_needs.insn.regs[j][i], | |
1539 | in_max + insn_needs.input.regs[j][i]); | |
1540 | ||
1541 | insn_needs.output.regs[j][i] += out_max; | |
1542 | insn_needs.other.regs[j][i] | |
1543 | += MAX (MAX (insn_needs.input.regs[j][i], | |
1544 | insn_needs.output.regs[j][i]), | |
1545 | insn_needs.other_addr.regs[j][i]); | |
1546 | ||
1547 | } | |
1548 | ||
1549 | /* Now compute group needs. */ | |
1550 | for (in_max = 0, out_max = 0, j = 0; j < reload_n_operands; j++) | |
1551 | { | |
1552 | in_max = MAX (in_max, insn_needs.in_addr[j].groups[i]); | |
1553 | in_max = MAX (in_max, insn_needs.in_addr_addr[j].groups[i]); | |
1554 | out_max = MAX (out_max, insn_needs.out_addr[j].groups[i]); | |
1555 | out_max = MAX (out_max, insn_needs.out_addr_addr[j].groups[i]); | |
1556 | } | |
1557 | ||
1558 | in_max = MAX (MAX (insn_needs.op_addr.groups[i], | |
1559 | insn_needs.op_addr_reload.groups[i]), | |
1560 | in_max); | |
1561 | out_max = MAX (out_max, insn_needs.insn.groups[i]); | |
1562 | ||
1563 | insn_needs.input.groups[i] | |
1564 | = MAX (insn_needs.input.groups[i] | |
1565 | + insn_needs.op_addr.groups[i] | |
1566 | + insn_needs.insn.groups[i], | |
1567 | in_max + insn_needs.input.groups[i]); | |
1568 | ||
1569 | insn_needs.output.groups[i] += out_max; | |
1570 | insn_needs.other.groups[i] | |
1571 | += MAX (MAX (insn_needs.input.groups[i], | |
1572 | insn_needs.output.groups[i]), | |
1573 | insn_needs.other_addr.groups[i]); | |
1574 | } | |
1575 | ||
7609e720 BS |
1576 | /* Record the needs for later. */ |
1577 | chain->need = insn_needs.other; | |
1e5bd841 | 1578 | } |
03acd8f8 | 1579 | \f |
1e5bd841 BS |
1580 | /* Find a group of exactly 2 registers. |
1581 | ||
1582 | First try to fill out the group by spilling a single register which | |
1583 | would allow completion of the group. | |
1584 | ||
1585 | Then try to create a new group from a pair of registers, neither of | |
1586 | which are explicitly used. | |
1587 | ||
1588 | Then try to create a group from any pair of registers. */ | |
03acd8f8 BS |
1589 | |
1590 | static void | |
1591 | find_tworeg_group (chain, class, dumpfile) | |
1592 | struct insn_chain *chain; | |
1e5bd841 BS |
1593 | int class; |
1594 | FILE *dumpfile; | |
1595 | { | |
1596 | int i; | |
1597 | /* First, look for a register that will complete a group. */ | |
1598 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
1599 | { | |
1600 | int j, other; | |
1601 | ||
1602 | j = potential_reload_regs[i]; | |
1603 | if (j >= 0 && ! TEST_HARD_REG_BIT (bad_spill_regs, j) | |
1604 | && ((j > 0 && (other = j - 1, spill_reg_order[other] >= 0) | |
1605 | && TEST_HARD_REG_BIT (reg_class_contents[class], j) | |
1606 | && TEST_HARD_REG_BIT (reg_class_contents[class], other) | |
03acd8f8 BS |
1607 | && HARD_REGNO_MODE_OK (other, chain->group_mode[class]) |
1608 | && ! TEST_HARD_REG_BIT (chain->counted_for_nongroups, other) | |
1e5bd841 BS |
1609 | /* We don't want one part of another group. |
1610 | We could get "two groups" that overlap! */ | |
03acd8f8 | 1611 | && ! TEST_HARD_REG_BIT (chain->counted_for_groups, other)) |
1e5bd841 BS |
1612 | || (j < FIRST_PSEUDO_REGISTER - 1 |
1613 | && (other = j + 1, spill_reg_order[other] >= 0) | |
1614 | && TEST_HARD_REG_BIT (reg_class_contents[class], j) | |
1615 | && TEST_HARD_REG_BIT (reg_class_contents[class], other) | |
03acd8f8 BS |
1616 | && HARD_REGNO_MODE_OK (j, chain->group_mode[class]) |
1617 | && ! TEST_HARD_REG_BIT (chain->counted_for_nongroups, other) | |
1618 | && ! TEST_HARD_REG_BIT (chain->counted_for_groups, other)))) | |
1e5bd841 BS |
1619 | { |
1620 | register enum reg_class *p; | |
1621 | ||
1622 | /* We have found one that will complete a group, | |
1623 | so count off one group as provided. */ | |
03acd8f8 | 1624 | chain->need.groups[class]--; |
1e5bd841 BS |
1625 | p = reg_class_superclasses[class]; |
1626 | while (*p != LIM_REG_CLASSES) | |
1627 | { | |
03acd8f8 BS |
1628 | if (chain->group_size [(int) *p] <= chain->group_size [class]) |
1629 | chain->need.groups[(int) *p]--; | |
1e5bd841 BS |
1630 | p++; |
1631 | } | |
1632 | ||
1633 | /* Indicate both these regs are part of a group. */ | |
03acd8f8 BS |
1634 | SET_HARD_REG_BIT (chain->counted_for_groups, j); |
1635 | SET_HARD_REG_BIT (chain->counted_for_groups, other); | |
1e5bd841 BS |
1636 | break; |
1637 | } | |
1638 | } | |
1639 | /* We can't complete a group, so start one. */ | |
1e5bd841 BS |
1640 | if (i == FIRST_PSEUDO_REGISTER) |
1641 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
1642 | { | |
1643 | int j, k; | |
1644 | j = potential_reload_regs[i]; | |
1645 | /* Verify that J+1 is a potential reload reg. */ | |
1646 | for (k = 0; k < FIRST_PSEUDO_REGISTER; k++) | |
1647 | if (potential_reload_regs[k] == j + 1) | |
1648 | break; | |
1649 | if (j >= 0 && j + 1 < FIRST_PSEUDO_REGISTER | |
1650 | && k < FIRST_PSEUDO_REGISTER | |
1651 | && spill_reg_order[j] < 0 && spill_reg_order[j + 1] < 0 | |
1652 | && TEST_HARD_REG_BIT (reg_class_contents[class], j) | |
1653 | && TEST_HARD_REG_BIT (reg_class_contents[class], j + 1) | |
03acd8f8 BS |
1654 | && HARD_REGNO_MODE_OK (j, chain->group_mode[class]) |
1655 | && ! TEST_HARD_REG_BIT (chain->counted_for_nongroups, j + 1) | |
1e5bd841 BS |
1656 | && ! TEST_HARD_REG_BIT (bad_spill_regs, j + 1)) |
1657 | break; | |
1658 | } | |
1659 | ||
1660 | /* I should be the index in potential_reload_regs | |
1661 | of the new reload reg we have found. */ | |
1662 | ||
03acd8f8 | 1663 | new_spill_reg (chain, i, class, 0, dumpfile); |
1e5bd841 BS |
1664 | } |
1665 | ||
1666 | /* Find a group of more than 2 registers. | |
1667 | Look for a sufficient sequence of unspilled registers, and spill them all | |
1668 | at once. */ | |
03acd8f8 BS |
1669 | |
1670 | static void | |
1671 | find_group (chain, class, dumpfile) | |
1672 | struct insn_chain *chain; | |
1e5bd841 BS |
1673 | int class; |
1674 | FILE *dumpfile; | |
1675 | { | |
1e5bd841 BS |
1676 | int i; |
1677 | ||
1678 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
1679 | { | |
03acd8f8 | 1680 | int j = potential_reload_regs[i]; |
1e5bd841 | 1681 | |
1e5bd841 | 1682 | if (j >= 0 |
03acd8f8 BS |
1683 | && j + chain->group_size[class] <= FIRST_PSEUDO_REGISTER |
1684 | && HARD_REGNO_MODE_OK (j, chain->group_mode[class])) | |
1e5bd841 | 1685 | { |
03acd8f8 | 1686 | int k; |
1e5bd841 | 1687 | /* Check each reg in the sequence. */ |
03acd8f8 | 1688 | for (k = 0; k < chain->group_size[class]; k++) |
1e5bd841 BS |
1689 | if (! (spill_reg_order[j + k] < 0 |
1690 | && ! TEST_HARD_REG_BIT (bad_spill_regs, j + k) | |
1691 | && TEST_HARD_REG_BIT (reg_class_contents[class], j + k))) | |
1692 | break; | |
1693 | /* We got a full sequence, so spill them all. */ | |
03acd8f8 | 1694 | if (k == chain->group_size[class]) |
1e5bd841 BS |
1695 | { |
1696 | register enum reg_class *p; | |
03acd8f8 | 1697 | for (k = 0; k < chain->group_size[class]; k++) |
1e5bd841 BS |
1698 | { |
1699 | int idx; | |
03acd8f8 | 1700 | SET_HARD_REG_BIT (chain->counted_for_groups, j + k); |
1e5bd841 BS |
1701 | for (idx = 0; idx < FIRST_PSEUDO_REGISTER; idx++) |
1702 | if (potential_reload_regs[idx] == j + k) | |
1703 | break; | |
03acd8f8 | 1704 | new_spill_reg (chain, idx, class, 0, dumpfile); |
1e5bd841 BS |
1705 | } |
1706 | ||
1707 | /* We have found one that will complete a group, | |
1708 | so count off one group as provided. */ | |
03acd8f8 | 1709 | chain->need.groups[class]--; |
1e5bd841 BS |
1710 | p = reg_class_superclasses[class]; |
1711 | while (*p != LIM_REG_CLASSES) | |
1712 | { | |
03acd8f8 BS |
1713 | if (chain->group_size [(int) *p] |
1714 | <= chain->group_size [class]) | |
1715 | chain->need.groups[(int) *p]--; | |
1e5bd841 BS |
1716 | p++; |
1717 | } | |
03acd8f8 | 1718 | return; |
1e5bd841 BS |
1719 | } |
1720 | } | |
1721 | } | |
1722 | /* There are no groups left. */ | |
03acd8f8 | 1723 | spill_failure (chain->insn); |
1e5bd841 | 1724 | failure = 1; |
1e5bd841 BS |
1725 | } |
1726 | ||
03acd8f8 BS |
1727 | /* If pseudo REG conflicts with one of our reload registers, mark it as |
1728 | spilled. */ | |
1729 | static void | |
1730 | maybe_mark_pseudo_spilled (reg) | |
1731 | int reg; | |
1732 | { | |
1733 | int i; | |
1734 | int r = reg_renumber[reg]; | |
1735 | int nregs; | |
1736 | ||
1737 | if (r < 0) | |
1738 | abort (); | |
1739 | nregs = HARD_REGNO_NREGS (r, PSEUDO_REGNO_MODE (reg)); | |
1740 | for (i = 0; i < n_spills; i++) | |
1741 | if (r <= spill_regs[i] && r + nregs > spill_regs[i]) | |
1742 | { | |
1743 | SET_REGNO_REG_SET (spilled_pseudos, reg); | |
1744 | return; | |
1745 | } | |
1746 | } | |
1747 | ||
1748 | /* Find more reload regs to satisfy the remaining need of an insn, which | |
1749 | is given by CHAIN. | |
1e5bd841 BS |
1750 | Do it by ascending class number, since otherwise a reg |
1751 | might be spilled for a big class and might fail to count | |
1752 | for a smaller class even though it belongs to that class. | |
1753 | ||
1754 | Count spilled regs in `spills', and add entries to | |
1755 | `spill_regs' and `spill_reg_order'. | |
1756 | ||
1757 | ??? Note there is a problem here. | |
1758 | When there is a need for a group in a high-numbered class, | |
1759 | and also need for non-group regs that come from a lower class, | |
1760 | the non-group regs are chosen first. If there aren't many regs, | |
1761 | they might leave no room for a group. | |
1762 | ||
1763 | This was happening on the 386. To fix it, we added the code | |
1764 | that calls possible_group_p, so that the lower class won't | |
1765 | break up the last possible group. | |
1766 | ||
1767 | Really fixing the problem would require changes above | |
1768 | in counting the regs already spilled, and in choose_reload_regs. | |
1769 | It might be hard to avoid introducing bugs there. */ | |
1770 | ||
03acd8f8 BS |
1771 | static void |
1772 | find_reload_regs (chain, dumpfile) | |
1773 | struct insn_chain *chain; | |
1e5bd841 BS |
1774 | FILE *dumpfile; |
1775 | { | |
03acd8f8 BS |
1776 | int i, class; |
1777 | short *group_needs = chain->need.groups; | |
1778 | short *simple_needs = chain->need.regs[0]; | |
1779 | short *nongroup_needs = chain->need.regs[1]; | |
1780 | ||
1781 | if (dumpfile) | |
1782 | fprintf (dumpfile, "Spilling for insn %d.\n", INSN_UID (chain->insn)); | |
1783 | ||
1784 | /* Compute the order of preference for hard registers to spill. | |
1785 | Store them by decreasing preference in potential_reload_regs. */ | |
1786 | ||
1787 | order_regs_for_reload (chain); | |
1788 | ||
1789 | /* So far, no hard regs have been spilled. */ | |
1790 | n_spills = 0; | |
1791 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
1792 | spill_reg_order[i] = -1; | |
1e5bd841 | 1793 | |
03acd8f8 BS |
1794 | CLEAR_HARD_REG_SET (chain->used_spill_regs); |
1795 | CLEAR_HARD_REG_SET (chain->counted_for_groups); | |
1796 | CLEAR_HARD_REG_SET (chain->counted_for_nongroups); | |
1e5bd841 BS |
1797 | |
1798 | for (class = 0; class < N_REG_CLASSES; class++) | |
1799 | { | |
1800 | /* First get the groups of registers. | |
1801 | If we got single registers first, we might fragment | |
1802 | possible groups. */ | |
03acd8f8 | 1803 | while (group_needs[class] > 0) |
1e5bd841 BS |
1804 | { |
1805 | /* If any single spilled regs happen to form groups, | |
1806 | count them now. Maybe we don't really need | |
1807 | to spill another group. */ | |
03acd8f8 | 1808 | count_possible_groups (chain, class); |
1e5bd841 | 1809 | |
03acd8f8 | 1810 | if (group_needs[class] <= 0) |
1e5bd841 BS |
1811 | break; |
1812 | ||
03acd8f8 | 1813 | /* Groups of size 2, the only groups used on most machines, |
1e5bd841 | 1814 | are treated specially. */ |
03acd8f8 BS |
1815 | if (chain->group_size[class] == 2) |
1816 | find_tworeg_group (chain, class, dumpfile); | |
1e5bd841 | 1817 | else |
03acd8f8 | 1818 | find_group (chain, class, dumpfile); |
1e5bd841 | 1819 | if (failure) |
03acd8f8 | 1820 | return; |
1e5bd841 BS |
1821 | } |
1822 | ||
1823 | /* Now similarly satisfy all need for single registers. */ | |
1824 | ||
03acd8f8 | 1825 | while (simple_needs[class] > 0 || nongroup_needs[class] > 0) |
1e5bd841 | 1826 | { |
1e5bd841 BS |
1827 | /* If we spilled enough regs, but they weren't counted |
1828 | against the non-group need, see if we can count them now. | |
1829 | If so, we can avoid some actual spilling. */ | |
03acd8f8 | 1830 | if (simple_needs[class] <= 0 && nongroup_needs[class] > 0) |
1e5bd841 BS |
1831 | for (i = 0; i < n_spills; i++) |
1832 | { | |
1833 | int regno = spill_regs[i]; | |
1834 | if (TEST_HARD_REG_BIT (reg_class_contents[class], regno) | |
03acd8f8 BS |
1835 | && !TEST_HARD_REG_BIT (chain->counted_for_groups, regno) |
1836 | && !TEST_HARD_REG_BIT (chain->counted_for_nongroups, regno) | |
1837 | && nongroup_needs[class] > 0) | |
1838 | { | |
1839 | register enum reg_class *p; | |
1e5bd841 | 1840 | |
03acd8f8 BS |
1841 | SET_HARD_REG_BIT (chain->counted_for_nongroups, regno); |
1842 | nongroup_needs[class]--; | |
1843 | p = reg_class_superclasses[class]; | |
1844 | while (*p != LIM_REG_CLASSES) | |
1845 | nongroup_needs[(int) *p++]--; | |
1846 | } | |
1e5bd841 | 1847 | } |
03acd8f8 BS |
1848 | |
1849 | if (simple_needs[class] <= 0 && nongroup_needs[class] <= 0) | |
1e5bd841 BS |
1850 | break; |
1851 | ||
1852 | /* Consider the potential reload regs that aren't | |
1853 | yet in use as reload regs, in order of preference. | |
1854 | Find the most preferred one that's in this class. */ | |
1855 | ||
1856 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
1857 | { | |
1858 | int regno = potential_reload_regs[i]; | |
1859 | if (regno >= 0 | |
1860 | && TEST_HARD_REG_BIT (reg_class_contents[class], regno) | |
1861 | /* If this reg will not be available for groups, | |
1862 | pick one that does not foreclose possible groups. | |
1863 | This is a kludge, and not very general, | |
1864 | but it should be sufficient to make the 386 work, | |
1865 | and the problem should not occur on machines with | |
1866 | more registers. */ | |
03acd8f8 BS |
1867 | && (nongroup_needs[class] == 0 |
1868 | || possible_group_p (chain, regno))) | |
1e5bd841 BS |
1869 | break; |
1870 | } | |
1871 | ||
1872 | /* If we couldn't get a register, try to get one even if we | |
1873 | might foreclose possible groups. This may cause problems | |
1874 | later, but that's better than aborting now, since it is | |
1875 | possible that we will, in fact, be able to form the needed | |
1876 | group even with this allocation. */ | |
1877 | ||
1878 | if (i >= FIRST_PSEUDO_REGISTER | |
03acd8f8 | 1879 | && asm_noperands (chain->insn) < 0) |
1e5bd841 BS |
1880 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) |
1881 | if (potential_reload_regs[i] >= 0 | |
1882 | && TEST_HARD_REG_BIT (reg_class_contents[class], | |
1883 | potential_reload_regs[i])) | |
1884 | break; | |
1885 | ||
1886 | /* I should be the index in potential_reload_regs | |
1887 | of the new reload reg we have found. */ | |
1888 | ||
03acd8f8 BS |
1889 | new_spill_reg (chain, i, class, 1, dumpfile); |
1890 | if (failure) | |
1891 | return; | |
1e5bd841 BS |
1892 | } |
1893 | } | |
03acd8f8 BS |
1894 | |
1895 | /* We know which hard regs to use, now mark the pseudos that live in them | |
1896 | as needing to be kicked out. */ | |
1897 | EXECUTE_IF_SET_IN_REG_SET | |
1898 | (chain->live_before, FIRST_PSEUDO_REGISTER, i, | |
1899 | { | |
1900 | maybe_mark_pseudo_spilled (i); | |
1901 | }); | |
1902 | EXECUTE_IF_SET_IN_REG_SET | |
1903 | (chain->live_after, FIRST_PSEUDO_REGISTER, i, | |
1904 | { | |
1905 | maybe_mark_pseudo_spilled (i); | |
1906 | }); | |
1907 | ||
1908 | IOR_HARD_REG_SET (used_spill_regs, chain->used_spill_regs); | |
1e5bd841 BS |
1909 | } |
1910 | ||
03acd8f8 BS |
1911 | void |
1912 | dump_needs (chain, dumpfile) | |
1913 | struct insn_chain *chain; | |
09dd1133 BS |
1914 | FILE *dumpfile; |
1915 | { | |
1916 | static char *reg_class_names[] = REG_CLASS_NAMES; | |
1917 | int i; | |
03acd8f8 | 1918 | struct needs *n = &chain->need; |
09dd1133 BS |
1919 | |
1920 | for (i = 0; i < N_REG_CLASSES; i++) | |
1921 | { | |
03acd8f8 | 1922 | if (n->regs[i][0] > 0) |
09dd1133 | 1923 | fprintf (dumpfile, |
03acd8f8 BS |
1924 | ";; Need %d reg%s of class %s.\n", |
1925 | n->regs[i][0], n->regs[i][0] == 1 ? "" : "s", | |
1926 | reg_class_names[i]); | |
1927 | if (n->regs[i][1] > 0) | |
09dd1133 | 1928 | fprintf (dumpfile, |
03acd8f8 BS |
1929 | ";; Need %d nongroup reg%s of class %s.\n", |
1930 | n->regs[i][1], n->regs[i][1] == 1 ? "" : "s", | |
1931 | reg_class_names[i]); | |
1932 | if (n->groups[i] > 0) | |
09dd1133 | 1933 | fprintf (dumpfile, |
03acd8f8 BS |
1934 | ";; Need %d group%s (%smode) of class %s.\n", |
1935 | n->groups[i], n->groups[i] == 1 ? "" : "s", | |
1936 | mode_name[(int) chain->group_mode[i]], | |
1937 | reg_class_names[i]); | |
09dd1133 BS |
1938 | } |
1939 | } | |
32131a9c | 1940 | \f |
437a710d BS |
1941 | /* Delete all insns that were inserted by emit_caller_save_insns during |
1942 | this iteration. */ | |
1943 | static void | |
7609e720 | 1944 | delete_caller_save_insns () |
437a710d | 1945 | { |
7609e720 | 1946 | struct insn_chain *c = reload_insn_chain; |
437a710d | 1947 | |
7609e720 | 1948 | while (c != 0) |
437a710d | 1949 | { |
7609e720 | 1950 | while (c != 0 && c->is_caller_save_insn) |
437a710d | 1951 | { |
7609e720 BS |
1952 | struct insn_chain *next = c->next; |
1953 | rtx insn = c->insn; | |
1954 | ||
1955 | if (insn == basic_block_head[c->block]) | |
1956 | basic_block_head[c->block] = NEXT_INSN (insn); | |
1957 | if (insn == basic_block_end[c->block]) | |
1958 | basic_block_end[c->block] = PREV_INSN (insn); | |
1959 | if (c == reload_insn_chain) | |
1960 | reload_insn_chain = next; | |
1961 | ||
1962 | if (NEXT_INSN (insn) != 0) | |
1963 | PREV_INSN (NEXT_INSN (insn)) = PREV_INSN (insn); | |
1964 | if (PREV_INSN (insn) != 0) | |
1965 | NEXT_INSN (PREV_INSN (insn)) = NEXT_INSN (insn); | |
1966 | ||
1967 | if (next) | |
1968 | next->prev = c->prev; | |
1969 | if (c->prev) | |
1970 | c->prev->next = next; | |
1971 | c->next = unused_insn_chains; | |
1972 | unused_insn_chains = c; | |
1973 | c = next; | |
437a710d | 1974 | } |
7609e720 BS |
1975 | if (c != 0) |
1976 | c = c->next; | |
437a710d BS |
1977 | } |
1978 | } | |
1979 | \f | |
32131a9c RK |
1980 | /* Nonzero if, after spilling reg REGNO for non-groups, |
1981 | it will still be possible to find a group if we still need one. */ | |
1982 | ||
1983 | static int | |
03acd8f8 BS |
1984 | possible_group_p (chain, regno) |
1985 | struct insn_chain *chain; | |
32131a9c | 1986 | int regno; |
32131a9c RK |
1987 | { |
1988 | int i; | |
1989 | int class = (int) NO_REGS; | |
1990 | ||
1991 | for (i = 0; i < (int) N_REG_CLASSES; i++) | |
03acd8f8 | 1992 | if (chain->need.groups[i] > 0) |
32131a9c RK |
1993 | { |
1994 | class = i; | |
1995 | break; | |
1996 | } | |
1997 | ||
1998 | if (class == (int) NO_REGS) | |
1999 | return 1; | |
2000 | ||
2001 | /* Consider each pair of consecutive registers. */ | |
2002 | for (i = 0; i < FIRST_PSEUDO_REGISTER - 1; i++) | |
2003 | { | |
2004 | /* Ignore pairs that include reg REGNO. */ | |
2005 | if (i == regno || i + 1 == regno) | |
2006 | continue; | |
2007 | ||
2008 | /* Ignore pairs that are outside the class that needs the group. | |
2009 | ??? Here we fail to handle the case where two different classes | |
2010 | independently need groups. But this never happens with our | |
2011 | current machine descriptions. */ | |
2012 | if (! (TEST_HARD_REG_BIT (reg_class_contents[class], i) | |
2013 | && TEST_HARD_REG_BIT (reg_class_contents[class], i + 1))) | |
2014 | continue; | |
2015 | ||
2016 | /* A pair of consecutive regs we can still spill does the trick. */ | |
2017 | if (spill_reg_order[i] < 0 && spill_reg_order[i + 1] < 0 | |
2018 | && ! TEST_HARD_REG_BIT (bad_spill_regs, i) | |
2019 | && ! TEST_HARD_REG_BIT (bad_spill_regs, i + 1)) | |
2020 | return 1; | |
2021 | ||
2022 | /* A pair of one already spilled and one we can spill does it | |
2023 | provided the one already spilled is not otherwise reserved. */ | |
2024 | if (spill_reg_order[i] < 0 | |
2025 | && ! TEST_HARD_REG_BIT (bad_spill_regs, i) | |
2026 | && spill_reg_order[i + 1] >= 0 | |
03acd8f8 BS |
2027 | && ! TEST_HARD_REG_BIT (chain->counted_for_groups, i + 1) |
2028 | && ! TEST_HARD_REG_BIT (chain->counted_for_nongroups, i + 1)) | |
32131a9c RK |
2029 | return 1; |
2030 | if (spill_reg_order[i + 1] < 0 | |
2031 | && ! TEST_HARD_REG_BIT (bad_spill_regs, i + 1) | |
2032 | && spill_reg_order[i] >= 0 | |
03acd8f8 BS |
2033 | && ! TEST_HARD_REG_BIT (chain->counted_for_groups, i) |
2034 | && ! TEST_HARD_REG_BIT (chain->counted_for_nongroups, i)) | |
32131a9c RK |
2035 | return 1; |
2036 | } | |
2037 | ||
2038 | return 0; | |
2039 | } | |
03acd8f8 | 2040 | |
066aca28 RK |
2041 | /* Count any groups of CLASS that can be formed from the registers recently |
2042 | spilled. */ | |
32131a9c RK |
2043 | |
2044 | static void | |
03acd8f8 BS |
2045 | count_possible_groups (chain, class) |
2046 | struct insn_chain *chain; | |
066aca28 | 2047 | int class; |
32131a9c | 2048 | { |
066aca28 RK |
2049 | HARD_REG_SET new; |
2050 | int i, j; | |
2051 | ||
32131a9c RK |
2052 | /* Now find all consecutive groups of spilled registers |
2053 | and mark each group off against the need for such groups. | |
2054 | But don't count them against ordinary need, yet. */ | |
2055 | ||
03acd8f8 | 2056 | if (chain->group_size[class] == 0) |
066aca28 RK |
2057 | return; |
2058 | ||
2059 | CLEAR_HARD_REG_SET (new); | |
2060 | ||
2061 | /* Make a mask of all the regs that are spill regs in class I. */ | |
2062 | for (i = 0; i < n_spills; i++) | |
03acd8f8 BS |
2063 | { |
2064 | int regno = spill_regs[i]; | |
2065 | ||
2066 | if (TEST_HARD_REG_BIT (reg_class_contents[class], regno) | |
2067 | && ! TEST_HARD_REG_BIT (chain->counted_for_groups, regno) | |
2068 | && ! TEST_HARD_REG_BIT (chain->counted_for_nongroups, regno)) | |
2069 | SET_HARD_REG_BIT (new, regno); | |
2070 | } | |
066aca28 RK |
2071 | |
2072 | /* Find each consecutive group of them. */ | |
03acd8f8 | 2073 | for (i = 0; i < FIRST_PSEUDO_REGISTER && chain->need.groups[class] > 0; i++) |
066aca28 | 2074 | if (TEST_HARD_REG_BIT (new, i) |
03acd8f8 BS |
2075 | && i + chain->group_size[class] <= FIRST_PSEUDO_REGISTER |
2076 | && HARD_REGNO_MODE_OK (i, chain->group_mode[class])) | |
32131a9c | 2077 | { |
03acd8f8 | 2078 | for (j = 1; j < chain->group_size[class]; j++) |
066aca28 RK |
2079 | if (! TEST_HARD_REG_BIT (new, i + j)) |
2080 | break; | |
32131a9c | 2081 | |
03acd8f8 | 2082 | if (j == chain->group_size[class]) |
066aca28 RK |
2083 | { |
2084 | /* We found a group. Mark it off against this class's need for | |
2085 | groups, and against each superclass too. */ | |
2086 | register enum reg_class *p; | |
2087 | ||
03acd8f8 | 2088 | chain->need.groups[class]--; |
066aca28 RK |
2089 | p = reg_class_superclasses[class]; |
2090 | while (*p != LIM_REG_CLASSES) | |
d601d5da | 2091 | { |
03acd8f8 BS |
2092 | if (chain->group_size [(int) *p] <= chain->group_size [class]) |
2093 | chain->need.groups[(int) *p]--; | |
d601d5da JW |
2094 | p++; |
2095 | } | |
066aca28 RK |
2096 | |
2097 | /* Don't count these registers again. */ | |
03acd8f8 BS |
2098 | for (j = 0; j < chain->group_size[class]; j++) |
2099 | SET_HARD_REG_BIT (chain->counted_for_groups, i + j); | |
066aca28 RK |
2100 | } |
2101 | ||
2102 | /* Skip to the last reg in this group. When i is incremented above, | |
2103 | it will then point to the first reg of the next possible group. */ | |
2104 | i += j - 1; | |
2105 | } | |
32131a9c RK |
2106 | } |
2107 | \f | |
2108 | /* ALLOCATE_MODE is a register mode that needs to be reloaded. OTHER_MODE is | |
2109 | another mode that needs to be reloaded for the same register class CLASS. | |
2110 | If any reg in CLASS allows ALLOCATE_MODE but not OTHER_MODE, fail. | |
2111 | ALLOCATE_MODE will never be smaller than OTHER_MODE. | |
2112 | ||
2113 | This code used to also fail if any reg in CLASS allows OTHER_MODE but not | |
2114 | ALLOCATE_MODE. This test is unnecessary, because we will never try to put | |
2115 | something of mode ALLOCATE_MODE into an OTHER_MODE register. Testing this | |
2116 | causes unnecessary failures on machines requiring alignment of register | |
2117 | groups when the two modes are different sizes, because the larger mode has | |
2118 | more strict alignment rules than the smaller mode. */ | |
2119 | ||
2120 | static int | |
2121 | modes_equiv_for_class_p (allocate_mode, other_mode, class) | |
2122 | enum machine_mode allocate_mode, other_mode; | |
2123 | enum reg_class class; | |
2124 | { | |
2125 | register int regno; | |
2126 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
2127 | { | |
2128 | if (TEST_HARD_REG_BIT (reg_class_contents[(int) class], regno) | |
2129 | && HARD_REGNO_MODE_OK (regno, allocate_mode) | |
2130 | && ! HARD_REGNO_MODE_OK (regno, other_mode)) | |
2131 | return 0; | |
2132 | } | |
2133 | return 1; | |
2134 | } | |
03acd8f8 | 2135 | \f |
5352b11a RS |
2136 | /* Handle the failure to find a register to spill. |
2137 | INSN should be one of the insns which needed this particular spill reg. */ | |
2138 | ||
2139 | static void | |
2140 | spill_failure (insn) | |
2141 | rtx insn; | |
2142 | { | |
2143 | if (asm_noperands (PATTERN (insn)) >= 0) | |
2144 | error_for_asm (insn, "`asm' needs too many reloads"); | |
2145 | else | |
a89b2cc4 | 2146 | fatal_insn ("Unable to find a register to spill.", insn); |
5352b11a RS |
2147 | } |
2148 | ||
03acd8f8 BS |
2149 | /* Add a new register to the tables of available spill-registers. |
2150 | CHAIN is the insn for which the register will be used; we decrease the | |
2151 | needs of that insn. | |
32131a9c RK |
2152 | I is the index of this register in potential_reload_regs. |
2153 | CLASS is the regclass whose need is being satisfied. | |
03acd8f8 BS |
2154 | NONGROUP is 0 if this register is part of a group. |
2155 | DUMPFILE is the same as the one that `reload' got. */ | |
32131a9c | 2156 | |
03acd8f8 BS |
2157 | static void |
2158 | new_spill_reg (chain, i, class, nongroup, dumpfile) | |
2159 | struct insn_chain *chain; | |
32131a9c RK |
2160 | int i; |
2161 | int class; | |
03acd8f8 | 2162 | int nongroup; |
32131a9c RK |
2163 | FILE *dumpfile; |
2164 | { | |
2165 | register enum reg_class *p; | |
32131a9c RK |
2166 | int regno = potential_reload_regs[i]; |
2167 | ||
2168 | if (i >= FIRST_PSEUDO_REGISTER) | |
03acd8f8 BS |
2169 | { |
2170 | spill_failure (chain->insn); | |
2171 | failure = 1; | |
2172 | return; | |
2173 | } | |
32131a9c | 2174 | |
03acd8f8 | 2175 | if (TEST_HARD_REG_BIT (bad_spill_regs, regno)) |
da275344 MM |
2176 | { |
2177 | static char *reg_class_names[] = REG_CLASS_NAMES; | |
03acd8f8 BS |
2178 | |
2179 | if (asm_noperands (PATTERN (chain->insn)) < 0) | |
2180 | { | |
2181 | /* The error message is still correct - we know only that it wasn't | |
2182 | an asm statement that caused the problem, but one of the global | |
2183 | registers declared by the users might have screwed us. */ | |
2184 | error ("fixed or forbidden register %d (%s) was spilled for class %s.", | |
2185 | regno, reg_names[regno], reg_class_names[class]); | |
2186 | error ("This may be due to a compiler bug or to impossible asm"); | |
2187 | error ("statements or clauses."); | |
2188 | fatal_insn ("This is the instruction:", chain->insn); | |
2189 | } | |
2190 | error_for_asm (chain->insn, "Invalid `asm' statement:"); | |
2191 | error_for_asm (chain->insn, | |
2192 | "fixed or forbidden register %d (%s) was spilled for class %s.", | |
2193 | regno, reg_names[regno], reg_class_names[class]); | |
2194 | failure = 1; | |
2195 | return; | |
da275344 | 2196 | } |
32131a9c RK |
2197 | |
2198 | /* Make reg REGNO an additional reload reg. */ | |
2199 | ||
2200 | potential_reload_regs[i] = -1; | |
2201 | spill_regs[n_spills] = regno; | |
2202 | spill_reg_order[regno] = n_spills; | |
2203 | if (dumpfile) | |
03acd8f8 BS |
2204 | fprintf (dumpfile, "Spilling reg %d.\n", regno); |
2205 | SET_HARD_REG_BIT (chain->used_spill_regs, regno); | |
32131a9c RK |
2206 | |
2207 | /* Clear off the needs we just satisfied. */ | |
2208 | ||
03acd8f8 | 2209 | chain->need.regs[0][class]--; |
32131a9c RK |
2210 | p = reg_class_superclasses[class]; |
2211 | while (*p != LIM_REG_CLASSES) | |
03acd8f8 | 2212 | chain->need.regs[0][(int) *p++]--; |
32131a9c | 2213 | |
03acd8f8 | 2214 | if (nongroup && chain->need.regs[1][class] > 0) |
32131a9c | 2215 | { |
03acd8f8 BS |
2216 | SET_HARD_REG_BIT (chain->counted_for_nongroups, regno); |
2217 | chain->need.regs[1][class]--; | |
32131a9c RK |
2218 | p = reg_class_superclasses[class]; |
2219 | while (*p != LIM_REG_CLASSES) | |
03acd8f8 | 2220 | chain->need.regs[1][(int) *p++]--; |
32131a9c RK |
2221 | } |
2222 | ||
32131a9c | 2223 | n_spills++; |
32131a9c RK |
2224 | } |
2225 | \f | |
2226 | /* Delete an unneeded INSN and any previous insns who sole purpose is loading | |
2227 | data that is dead in INSN. */ | |
2228 | ||
2229 | static void | |
2230 | delete_dead_insn (insn) | |
2231 | rtx insn; | |
2232 | { | |
2233 | rtx prev = prev_real_insn (insn); | |
2234 | rtx prev_dest; | |
2235 | ||
2236 | /* If the previous insn sets a register that dies in our insn, delete it | |
2237 | too. */ | |
2238 | if (prev && GET_CODE (PATTERN (prev)) == SET | |
2239 | && (prev_dest = SET_DEST (PATTERN (prev)), GET_CODE (prev_dest) == REG) | |
2240 | && reg_mentioned_p (prev_dest, PATTERN (insn)) | |
b294ca38 R |
2241 | && find_regno_note (insn, REG_DEAD, REGNO (prev_dest)) |
2242 | && ! side_effects_p (SET_SRC (PATTERN (prev)))) | |
32131a9c RK |
2243 | delete_dead_insn (prev); |
2244 | ||
2245 | PUT_CODE (insn, NOTE); | |
2246 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
2247 | NOTE_SOURCE_FILE (insn) = 0; | |
2248 | } | |
2249 | ||
2250 | /* Modify the home of pseudo-reg I. | |
2251 | The new home is present in reg_renumber[I]. | |
2252 | ||
2253 | FROM_REG may be the hard reg that the pseudo-reg is being spilled from; | |
2254 | or it may be -1, meaning there is none or it is not relevant. | |
2255 | This is used so that all pseudos spilled from a given hard reg | |
2256 | can share one stack slot. */ | |
2257 | ||
2258 | static void | |
2259 | alter_reg (i, from_reg) | |
2260 | register int i; | |
2261 | int from_reg; | |
2262 | { | |
2263 | /* When outputting an inline function, this can happen | |
2264 | for a reg that isn't actually used. */ | |
2265 | if (regno_reg_rtx[i] == 0) | |
2266 | return; | |
2267 | ||
2268 | /* If the reg got changed to a MEM at rtl-generation time, | |
2269 | ignore it. */ | |
2270 | if (GET_CODE (regno_reg_rtx[i]) != REG) | |
2271 | return; | |
2272 | ||
2273 | /* Modify the reg-rtx to contain the new hard reg | |
2274 | number or else to contain its pseudo reg number. */ | |
2275 | REGNO (regno_reg_rtx[i]) | |
2276 | = reg_renumber[i] >= 0 ? reg_renumber[i] : i; | |
2277 | ||
2278 | /* If we have a pseudo that is needed but has no hard reg or equivalent, | |
2279 | allocate a stack slot for it. */ | |
2280 | ||
2281 | if (reg_renumber[i] < 0 | |
b1f21e0a | 2282 | && REG_N_REFS (i) > 0 |
32131a9c RK |
2283 | && reg_equiv_constant[i] == 0 |
2284 | && reg_equiv_memory_loc[i] == 0) | |
2285 | { | |
2286 | register rtx x; | |
2287 | int inherent_size = PSEUDO_REGNO_BYTES (i); | |
2288 | int total_size = MAX (inherent_size, reg_max_ref_width[i]); | |
2289 | int adjust = 0; | |
2290 | ||
2291 | /* Each pseudo reg has an inherent size which comes from its own mode, | |
2292 | and a total size which provides room for paradoxical subregs | |
2293 | which refer to the pseudo reg in wider modes. | |
2294 | ||
2295 | We can use a slot already allocated if it provides both | |
2296 | enough inherent space and enough total space. | |
2297 | Otherwise, we allocate a new slot, making sure that it has no less | |
2298 | inherent space, and no less total space, then the previous slot. */ | |
2299 | if (from_reg == -1) | |
2300 | { | |
2301 | /* No known place to spill from => no slot to reuse. */ | |
cabcf079 ILT |
2302 | x = assign_stack_local (GET_MODE (regno_reg_rtx[i]), total_size, |
2303 | inherent_size == total_size ? 0 : -1); | |
f76b9db2 | 2304 | if (BYTES_BIG_ENDIAN) |
02db8dd0 RK |
2305 | /* Cancel the big-endian correction done in assign_stack_local. |
2306 | Get the address of the beginning of the slot. | |
2307 | This is so we can do a big-endian correction unconditionally | |
2308 | below. */ | |
2309 | adjust = inherent_size - total_size; | |
2310 | ||
2311 | RTX_UNCHANGING_P (x) = RTX_UNCHANGING_P (regno_reg_rtx[i]); | |
32131a9c RK |
2312 | } |
2313 | /* Reuse a stack slot if possible. */ | |
2314 | else if (spill_stack_slot[from_reg] != 0 | |
2315 | && spill_stack_slot_width[from_reg] >= total_size | |
2316 | && (GET_MODE_SIZE (GET_MODE (spill_stack_slot[from_reg])) | |
2317 | >= inherent_size)) | |
2318 | x = spill_stack_slot[from_reg]; | |
2319 | /* Allocate a bigger slot. */ | |
2320 | else | |
2321 | { | |
2322 | /* Compute maximum size needed, both for inherent size | |
2323 | and for total size. */ | |
2324 | enum machine_mode mode = GET_MODE (regno_reg_rtx[i]); | |
4f2d3674 | 2325 | rtx stack_slot; |
32131a9c RK |
2326 | if (spill_stack_slot[from_reg]) |
2327 | { | |
2328 | if (GET_MODE_SIZE (GET_MODE (spill_stack_slot[from_reg])) | |
2329 | > inherent_size) | |
2330 | mode = GET_MODE (spill_stack_slot[from_reg]); | |
2331 | if (spill_stack_slot_width[from_reg] > total_size) | |
2332 | total_size = spill_stack_slot_width[from_reg]; | |
2333 | } | |
2334 | /* Make a slot with that size. */ | |
cabcf079 ILT |
2335 | x = assign_stack_local (mode, total_size, |
2336 | inherent_size == total_size ? 0 : -1); | |
4f2d3674 | 2337 | stack_slot = x; |
f76b9db2 ILT |
2338 | if (BYTES_BIG_ENDIAN) |
2339 | { | |
2340 | /* Cancel the big-endian correction done in assign_stack_local. | |
2341 | Get the address of the beginning of the slot. | |
2342 | This is so we can do a big-endian correction unconditionally | |
2343 | below. */ | |
2344 | adjust = GET_MODE_SIZE (mode) - total_size; | |
4f2d3674 | 2345 | if (adjust) |
38a448ca RH |
2346 | stack_slot = gen_rtx_MEM (mode_for_size (total_size |
2347 | * BITS_PER_UNIT, | |
2348 | MODE_INT, 1), | |
02db8dd0 | 2349 | plus_constant (XEXP (x, 0), adjust)); |
f76b9db2 | 2350 | } |
4f2d3674 | 2351 | spill_stack_slot[from_reg] = stack_slot; |
32131a9c RK |
2352 | spill_stack_slot_width[from_reg] = total_size; |
2353 | } | |
2354 | ||
32131a9c RK |
2355 | /* On a big endian machine, the "address" of the slot |
2356 | is the address of the low part that fits its inherent mode. */ | |
f76b9db2 | 2357 | if (BYTES_BIG_ENDIAN && inherent_size < total_size) |
32131a9c | 2358 | adjust += (total_size - inherent_size); |
32131a9c RK |
2359 | |
2360 | /* If we have any adjustment to make, or if the stack slot is the | |
2361 | wrong mode, make a new stack slot. */ | |
2362 | if (adjust != 0 || GET_MODE (x) != GET_MODE (regno_reg_rtx[i])) | |
2363 | { | |
38a448ca | 2364 | x = gen_rtx_MEM (GET_MODE (regno_reg_rtx[i]), |
32131a9c | 2365 | plus_constant (XEXP (x, 0), adjust)); |
9ec36da5 JL |
2366 | |
2367 | /* If this was shared among registers, must ensure we never | |
2368 | set it readonly since that can cause scheduling | |
2369 | problems. Note we would only have in this adjustment | |
2370 | case in any event, since the code above doesn't set it. */ | |
2371 | ||
2372 | if (from_reg == -1) | |
2373 | RTX_UNCHANGING_P (x) = RTX_UNCHANGING_P (regno_reg_rtx[i]); | |
32131a9c RK |
2374 | } |
2375 | ||
2376 | /* Save the stack slot for later. */ | |
2377 | reg_equiv_memory_loc[i] = x; | |
2378 | } | |
2379 | } | |
2380 | ||
2381 | /* Mark the slots in regs_ever_live for the hard regs | |
2382 | used by pseudo-reg number REGNO. */ | |
2383 | ||
2384 | void | |
2385 | mark_home_live (regno) | |
2386 | int regno; | |
2387 | { | |
2388 | register int i, lim; | |
2389 | i = reg_renumber[regno]; | |
2390 | if (i < 0) | |
2391 | return; | |
2392 | lim = i + HARD_REGNO_NREGS (i, PSEUDO_REGNO_MODE (regno)); | |
2393 | while (i < lim) | |
2394 | regs_ever_live[i++] = 1; | |
2395 | } | |
2396 | \f | |
2397 | /* This function handles the tracking of elimination offsets around branches. | |
2398 | ||
2399 | X is a piece of RTL being scanned. | |
2400 | ||
2401 | INSN is the insn that it came from, if any. | |
2402 | ||
2403 | INITIAL_P is non-zero if we are to set the offset to be the initial | |
2404 | offset and zero if we are setting the offset of the label to be the | |
2405 | current offset. */ | |
2406 | ||
2407 | static void | |
2408 | set_label_offsets (x, insn, initial_p) | |
2409 | rtx x; | |
2410 | rtx insn; | |
2411 | int initial_p; | |
2412 | { | |
2413 | enum rtx_code code = GET_CODE (x); | |
2414 | rtx tem; | |
e51712db | 2415 | unsigned int i; |
32131a9c RK |
2416 | struct elim_table *p; |
2417 | ||
2418 | switch (code) | |
2419 | { | |
2420 | case LABEL_REF: | |
8be386d9 RS |
2421 | if (LABEL_REF_NONLOCAL_P (x)) |
2422 | return; | |
2423 | ||
32131a9c RK |
2424 | x = XEXP (x, 0); |
2425 | ||
0f41302f | 2426 | /* ... fall through ... */ |
32131a9c RK |
2427 | |
2428 | case CODE_LABEL: | |
2429 | /* If we know nothing about this label, set the desired offsets. Note | |
2430 | that this sets the offset at a label to be the offset before a label | |
2431 | if we don't know anything about the label. This is not correct for | |
2432 | the label after a BARRIER, but is the best guess we can make. If | |
2433 | we guessed wrong, we will suppress an elimination that might have | |
2434 | been possible had we been able to guess correctly. */ | |
2435 | ||
2436 | if (! offsets_known_at[CODE_LABEL_NUMBER (x)]) | |
2437 | { | |
2438 | for (i = 0; i < NUM_ELIMINABLE_REGS; i++) | |
2439 | offsets_at[CODE_LABEL_NUMBER (x)][i] | |
2440 | = (initial_p ? reg_eliminate[i].initial_offset | |
2441 | : reg_eliminate[i].offset); | |
2442 | offsets_known_at[CODE_LABEL_NUMBER (x)] = 1; | |
2443 | } | |
2444 | ||
2445 | /* Otherwise, if this is the definition of a label and it is | |
d45cf215 | 2446 | preceded by a BARRIER, set our offsets to the known offset of |
32131a9c RK |
2447 | that label. */ |
2448 | ||
2449 | else if (x == insn | |
2450 | && (tem = prev_nonnote_insn (insn)) != 0 | |
2451 | && GET_CODE (tem) == BARRIER) | |
2a4b5f3b RK |
2452 | { |
2453 | num_not_at_initial_offset = 0; | |
2454 | for (i = 0; i < NUM_ELIMINABLE_REGS; i++) | |
2455 | { | |
2456 | reg_eliminate[i].offset = reg_eliminate[i].previous_offset | |
2457 | = offsets_at[CODE_LABEL_NUMBER (x)][i]; | |
1d0d98f3 RK |
2458 | if (reg_eliminate[i].can_eliminate |
2459 | && (reg_eliminate[i].offset | |
2460 | != reg_eliminate[i].initial_offset)) | |
2a4b5f3b RK |
2461 | num_not_at_initial_offset++; |
2462 | } | |
2463 | } | |
32131a9c RK |
2464 | |
2465 | else | |
2466 | /* If neither of the above cases is true, compare each offset | |
2467 | with those previously recorded and suppress any eliminations | |
2468 | where the offsets disagree. */ | |
a8fdc208 | 2469 | |
32131a9c RK |
2470 | for (i = 0; i < NUM_ELIMINABLE_REGS; i++) |
2471 | if (offsets_at[CODE_LABEL_NUMBER (x)][i] | |
2472 | != (initial_p ? reg_eliminate[i].initial_offset | |
2473 | : reg_eliminate[i].offset)) | |
2474 | reg_eliminate[i].can_eliminate = 0; | |
2475 | ||
2476 | return; | |
2477 | ||
2478 | case JUMP_INSN: | |
2479 | set_label_offsets (PATTERN (insn), insn, initial_p); | |
2480 | ||
0f41302f | 2481 | /* ... fall through ... */ |
32131a9c RK |
2482 | |
2483 | case INSN: | |
2484 | case CALL_INSN: | |
2485 | /* Any labels mentioned in REG_LABEL notes can be branched to indirectly | |
2486 | and hence must have all eliminations at their initial offsets. */ | |
2487 | for (tem = REG_NOTES (x); tem; tem = XEXP (tem, 1)) | |
2488 | if (REG_NOTE_KIND (tem) == REG_LABEL) | |
2489 | set_label_offsets (XEXP (tem, 0), insn, 1); | |
2490 | return; | |
2491 | ||
2492 | case ADDR_VEC: | |
2493 | case ADDR_DIFF_VEC: | |
2494 | /* Each of the labels in the address vector must be at their initial | |
38e01259 | 2495 | offsets. We want the first field for ADDR_VEC and the second |
32131a9c RK |
2496 | field for ADDR_DIFF_VEC. */ |
2497 | ||
e51712db | 2498 | for (i = 0; i < (unsigned) XVECLEN (x, code == ADDR_DIFF_VEC); i++) |
32131a9c RK |
2499 | set_label_offsets (XVECEXP (x, code == ADDR_DIFF_VEC, i), |
2500 | insn, initial_p); | |
2501 | return; | |
2502 | ||
2503 | case SET: | |
2504 | /* We only care about setting PC. If the source is not RETURN, | |
2505 | IF_THEN_ELSE, or a label, disable any eliminations not at | |
2506 | their initial offsets. Similarly if any arm of the IF_THEN_ELSE | |
2507 | isn't one of those possibilities. For branches to a label, | |
2508 | call ourselves recursively. | |
2509 | ||
2510 | Note that this can disable elimination unnecessarily when we have | |
2511 | a non-local goto since it will look like a non-constant jump to | |
2512 | someplace in the current function. This isn't a significant | |
2513 | problem since such jumps will normally be when all elimination | |
2514 | pairs are back to their initial offsets. */ | |
2515 | ||
2516 | if (SET_DEST (x) != pc_rtx) | |
2517 | return; | |
2518 | ||
2519 | switch (GET_CODE (SET_SRC (x))) | |
2520 | { | |
2521 | case PC: | |
2522 | case RETURN: | |
2523 | return; | |
2524 | ||
2525 | case LABEL_REF: | |
2526 | set_label_offsets (XEXP (SET_SRC (x), 0), insn, initial_p); | |
2527 | return; | |
2528 | ||
2529 | case IF_THEN_ELSE: | |
2530 | tem = XEXP (SET_SRC (x), 1); | |
2531 | if (GET_CODE (tem) == LABEL_REF) | |
2532 | set_label_offsets (XEXP (tem, 0), insn, initial_p); | |
2533 | else if (GET_CODE (tem) != PC && GET_CODE (tem) != RETURN) | |
2534 | break; | |
2535 | ||
2536 | tem = XEXP (SET_SRC (x), 2); | |
2537 | if (GET_CODE (tem) == LABEL_REF) | |
2538 | set_label_offsets (XEXP (tem, 0), insn, initial_p); | |
2539 | else if (GET_CODE (tem) != PC && GET_CODE (tem) != RETURN) | |
2540 | break; | |
2541 | return; | |
e9a25f70 JL |
2542 | |
2543 | default: | |
2544 | break; | |
32131a9c RK |
2545 | } |
2546 | ||
2547 | /* If we reach here, all eliminations must be at their initial | |
2548 | offset because we are doing a jump to a variable address. */ | |
2549 | for (p = reg_eliminate; p < ®_eliminate[NUM_ELIMINABLE_REGS]; p++) | |
2550 | if (p->offset != p->initial_offset) | |
2551 | p->can_eliminate = 0; | |
e9a25f70 JL |
2552 | break; |
2553 | ||
2554 | default: | |
2555 | break; | |
32131a9c RK |
2556 | } |
2557 | } | |
2558 | \f | |
2559 | /* Used for communication between the next two function to properly share | |
2560 | the vector for an ASM_OPERANDS. */ | |
2561 | ||
2562 | static struct rtvec_def *old_asm_operands_vec, *new_asm_operands_vec; | |
2563 | ||
a8fdc208 | 2564 | /* Scan X and replace any eliminable registers (such as fp) with a |
32131a9c RK |
2565 | replacement (such as sp), plus an offset. |
2566 | ||
2567 | MEM_MODE is the mode of an enclosing MEM. We need this to know how | |
2568 | much to adjust a register for, e.g., PRE_DEC. Also, if we are inside a | |
2569 | MEM, we are allowed to replace a sum of a register and the constant zero | |
2570 | with the register, which we cannot do outside a MEM. In addition, we need | |
2571 | to record the fact that a register is referenced outside a MEM. | |
2572 | ||
ff32812a | 2573 | If INSN is an insn, it is the insn containing X. If we replace a REG |
32131a9c RK |
2574 | in a SET_DEST with an equivalent MEM and INSN is non-zero, write a |
2575 | CLOBBER of the pseudo after INSN so find_equiv_regs will know that | |
38e01259 | 2576 | the REG is being modified. |
32131a9c | 2577 | |
ff32812a RS |
2578 | Alternatively, INSN may be a note (an EXPR_LIST or INSN_LIST). |
2579 | That's used when we eliminate in expressions stored in notes. | |
2580 | This means, do not set ref_outside_mem even if the reference | |
2581 | is outside of MEMs. | |
2582 | ||
32131a9c RK |
2583 | If we see a modification to a register we know about, take the |
2584 | appropriate action (see case SET, below). | |
2585 | ||
2586 | REG_EQUIV_MEM and REG_EQUIV_ADDRESS contain address that have had | |
2587 | replacements done assuming all offsets are at their initial values. If | |
2588 | they are not, or if REG_EQUIV_ADDRESS is nonzero for a pseudo we | |
2589 | encounter, return the actual location so that find_reloads will do | |
2590 | the proper thing. */ | |
2591 | ||
2592 | rtx | |
1914f5da | 2593 | eliminate_regs (x, mem_mode, insn) |
32131a9c RK |
2594 | rtx x; |
2595 | enum machine_mode mem_mode; | |
2596 | rtx insn; | |
2597 | { | |
2598 | enum rtx_code code = GET_CODE (x); | |
2599 | struct elim_table *ep; | |
2600 | int regno; | |
2601 | rtx new; | |
2602 | int i, j; | |
2603 | char *fmt; | |
2604 | int copied = 0; | |
2605 | ||
2606 | switch (code) | |
2607 | { | |
2608 | case CONST_INT: | |
2609 | case CONST_DOUBLE: | |
2610 | case CONST: | |
2611 | case SYMBOL_REF: | |
2612 | case CODE_LABEL: | |
2613 | case PC: | |
2614 | case CC0: | |
2615 | case ASM_INPUT: | |
2616 | case ADDR_VEC: | |
2617 | case ADDR_DIFF_VEC: | |
2618 | case RETURN: | |
2619 | return x; | |
2620 | ||
e9a25f70 JL |
2621 | case ADDRESSOF: |
2622 | /* This is only for the benefit of the debugging backends, which call | |
2623 | eliminate_regs on DECL_RTL; any ADDRESSOFs in the actual insns are | |
2624 | removed after CSE. */ | |
1914f5da | 2625 | new = eliminate_regs (XEXP (x, 0), 0, insn); |
e9a25f70 JL |
2626 | if (GET_CODE (new) == MEM) |
2627 | return XEXP (new, 0); | |
2628 | return x; | |
2629 | ||
32131a9c RK |
2630 | case REG: |
2631 | regno = REGNO (x); | |
2632 | ||
2633 | /* First handle the case where we encounter a bare register that | |
2634 | is eliminable. Replace it with a PLUS. */ | |
2635 | if (regno < FIRST_PSEUDO_REGISTER) | |
2636 | { | |
2637 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; | |
2638 | ep++) | |
2639 | if (ep->from_rtx == x && ep->can_eliminate) | |
2640 | { | |
ff32812a RS |
2641 | if (! mem_mode |
2642 | /* Refs inside notes don't count for this purpose. */ | |
fe089a90 | 2643 | && ! (insn != 0 && (GET_CODE (insn) == EXPR_LIST |
ff32812a | 2644 | || GET_CODE (insn) == INSN_LIST))) |
32131a9c RK |
2645 | ep->ref_outside_mem = 1; |
2646 | return plus_constant (ep->to_rtx, ep->previous_offset); | |
2647 | } | |
2648 | ||
2649 | } | |
32131a9c RK |
2650 | return x; |
2651 | ||
2652 | case PLUS: | |
2653 | /* If this is the sum of an eliminable register and a constant, rework | |
2654 | the sum. */ | |
2655 | if (GET_CODE (XEXP (x, 0)) == REG | |
2656 | && REGNO (XEXP (x, 0)) < FIRST_PSEUDO_REGISTER | |
2657 | && CONSTANT_P (XEXP (x, 1))) | |
2658 | { | |
2659 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; | |
2660 | ep++) | |
2661 | if (ep->from_rtx == XEXP (x, 0) && ep->can_eliminate) | |
2662 | { | |
e5687447 JW |
2663 | if (! mem_mode |
2664 | /* Refs inside notes don't count for this purpose. */ | |
2665 | && ! (insn != 0 && (GET_CODE (insn) == EXPR_LIST | |
2666 | || GET_CODE (insn) == INSN_LIST))) | |
32131a9c RK |
2667 | ep->ref_outside_mem = 1; |
2668 | ||
2669 | /* The only time we want to replace a PLUS with a REG (this | |
2670 | occurs when the constant operand of the PLUS is the negative | |
2671 | of the offset) is when we are inside a MEM. We won't want | |
2672 | to do so at other times because that would change the | |
2673 | structure of the insn in a way that reload can't handle. | |
2674 | We special-case the commonest situation in | |
2675 | eliminate_regs_in_insn, so just replace a PLUS with a | |
2676 | PLUS here, unless inside a MEM. */ | |
a23b64d5 | 2677 | if (mem_mode != 0 && GET_CODE (XEXP (x, 1)) == CONST_INT |
32131a9c RK |
2678 | && INTVAL (XEXP (x, 1)) == - ep->previous_offset) |
2679 | return ep->to_rtx; | |
2680 | else | |
38a448ca RH |
2681 | return gen_rtx_PLUS (Pmode, ep->to_rtx, |
2682 | plus_constant (XEXP (x, 1), | |
2683 | ep->previous_offset)); | |
32131a9c RK |
2684 | } |
2685 | ||
2686 | /* If the register is not eliminable, we are done since the other | |
2687 | operand is a constant. */ | |
2688 | return x; | |
2689 | } | |
2690 | ||
2691 | /* If this is part of an address, we want to bring any constant to the | |
2692 | outermost PLUS. We will do this by doing register replacement in | |
2693 | our operands and seeing if a constant shows up in one of them. | |
2694 | ||
2695 | We assume here this is part of an address (or a "load address" insn) | |
2696 | since an eliminable register is not likely to appear in any other | |
2697 | context. | |
2698 | ||
2699 | If we have (plus (eliminable) (reg)), we want to produce | |
930aeef3 | 2700 | (plus (plus (replacement) (reg) (const))). If this was part of a |
32131a9c RK |
2701 | normal add insn, (plus (replacement) (reg)) will be pushed as a |
2702 | reload. This is the desired action. */ | |
2703 | ||
2704 | { | |
1914f5da RH |
2705 | rtx new0 = eliminate_regs (XEXP (x, 0), mem_mode, insn); |
2706 | rtx new1 = eliminate_regs (XEXP (x, 1), mem_mode, insn); | |
32131a9c RK |
2707 | |
2708 | if (new0 != XEXP (x, 0) || new1 != XEXP (x, 1)) | |
2709 | { | |
2710 | /* If one side is a PLUS and the other side is a pseudo that | |
a8fdc208 | 2711 | didn't get a hard register but has a reg_equiv_constant, |
32131a9c RK |
2712 | we must replace the constant here since it may no longer |
2713 | be in the position of any operand. */ | |
2714 | if (GET_CODE (new0) == PLUS && GET_CODE (new1) == REG | |
2715 | && REGNO (new1) >= FIRST_PSEUDO_REGISTER | |
2716 | && reg_renumber[REGNO (new1)] < 0 | |
2717 | && reg_equiv_constant != 0 | |
2718 | && reg_equiv_constant[REGNO (new1)] != 0) | |
2719 | new1 = reg_equiv_constant[REGNO (new1)]; | |
2720 | else if (GET_CODE (new1) == PLUS && GET_CODE (new0) == REG | |
2721 | && REGNO (new0) >= FIRST_PSEUDO_REGISTER | |
2722 | && reg_renumber[REGNO (new0)] < 0 | |
2723 | && reg_equiv_constant[REGNO (new0)] != 0) | |
2724 | new0 = reg_equiv_constant[REGNO (new0)]; | |
2725 | ||
2726 | new = form_sum (new0, new1); | |
2727 | ||
2728 | /* As above, if we are not inside a MEM we do not want to | |
2729 | turn a PLUS into something else. We might try to do so here | |
2730 | for an addition of 0 if we aren't optimizing. */ | |
2731 | if (! mem_mode && GET_CODE (new) != PLUS) | |
38a448ca | 2732 | return gen_rtx_PLUS (GET_MODE (x), new, const0_rtx); |
32131a9c RK |
2733 | else |
2734 | return new; | |
2735 | } | |
2736 | } | |
2737 | return x; | |
2738 | ||
981c7390 RK |
2739 | case MULT: |
2740 | /* If this is the product of an eliminable register and a | |
2741 | constant, apply the distribute law and move the constant out | |
2742 | so that we have (plus (mult ..) ..). This is needed in order | |
9faa82d8 | 2743 | to keep load-address insns valid. This case is pathological. |
981c7390 RK |
2744 | We ignore the possibility of overflow here. */ |
2745 | if (GET_CODE (XEXP (x, 0)) == REG | |
2746 | && REGNO (XEXP (x, 0)) < FIRST_PSEUDO_REGISTER | |
2747 | && GET_CODE (XEXP (x, 1)) == CONST_INT) | |
2748 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; | |
2749 | ep++) | |
2750 | if (ep->from_rtx == XEXP (x, 0) && ep->can_eliminate) | |
2751 | { | |
2752 | if (! mem_mode | |
2753 | /* Refs inside notes don't count for this purpose. */ | |
2754 | && ! (insn != 0 && (GET_CODE (insn) == EXPR_LIST | |
2755 | || GET_CODE (insn) == INSN_LIST))) | |
2756 | ep->ref_outside_mem = 1; | |
2757 | ||
2758 | return | |
38a448ca | 2759 | plus_constant (gen_rtx_MULT (Pmode, ep->to_rtx, XEXP (x, 1)), |
981c7390 RK |
2760 | ep->previous_offset * INTVAL (XEXP (x, 1))); |
2761 | } | |
32131a9c | 2762 | |
0f41302f | 2763 | /* ... fall through ... */ |
32131a9c | 2764 | |
32131a9c RK |
2765 | case CALL: |
2766 | case COMPARE: | |
930aeef3 | 2767 | case MINUS: |
32131a9c RK |
2768 | case DIV: case UDIV: |
2769 | case MOD: case UMOD: | |
2770 | case AND: case IOR: case XOR: | |
45620ed4 RK |
2771 | case ROTATERT: case ROTATE: |
2772 | case ASHIFTRT: case LSHIFTRT: case ASHIFT: | |
32131a9c RK |
2773 | case NE: case EQ: |
2774 | case GE: case GT: case GEU: case GTU: | |
2775 | case LE: case LT: case LEU: case LTU: | |
2776 | { | |
1914f5da | 2777 | rtx new0 = eliminate_regs (XEXP (x, 0), mem_mode, insn); |
fb3821f7 | 2778 | rtx new1 |
1914f5da | 2779 | = XEXP (x, 1) ? eliminate_regs (XEXP (x, 1), mem_mode, insn) : 0; |
32131a9c RK |
2780 | |
2781 | if (new0 != XEXP (x, 0) || new1 != XEXP (x, 1)) | |
38a448ca | 2782 | return gen_rtx_fmt_ee (code, GET_MODE (x), new0, new1); |
32131a9c RK |
2783 | } |
2784 | return x; | |
2785 | ||
981c7390 RK |
2786 | case EXPR_LIST: |
2787 | /* If we have something in XEXP (x, 0), the usual case, eliminate it. */ | |
2788 | if (XEXP (x, 0)) | |
2789 | { | |
1914f5da | 2790 | new = eliminate_regs (XEXP (x, 0), mem_mode, insn); |
981c7390 | 2791 | if (new != XEXP (x, 0)) |
38a448ca | 2792 | x = gen_rtx_EXPR_LIST (REG_NOTE_KIND (x), new, XEXP (x, 1)); |
981c7390 RK |
2793 | } |
2794 | ||
0f41302f | 2795 | /* ... fall through ... */ |
981c7390 RK |
2796 | |
2797 | case INSN_LIST: | |
2798 | /* Now do eliminations in the rest of the chain. If this was | |
2799 | an EXPR_LIST, this might result in allocating more memory than is | |
2800 | strictly needed, but it simplifies the code. */ | |
2801 | if (XEXP (x, 1)) | |
2802 | { | |
1914f5da | 2803 | new = eliminate_regs (XEXP (x, 1), mem_mode, insn); |
981c7390 | 2804 | if (new != XEXP (x, 1)) |
38a448ca | 2805 | return gen_rtx_fmt_ee (GET_CODE (x), GET_MODE (x), XEXP (x, 0), new); |
981c7390 RK |
2806 | } |
2807 | return x; | |
2808 | ||
32131a9c RK |
2809 | case PRE_INC: |
2810 | case POST_INC: | |
2811 | case PRE_DEC: | |
2812 | case POST_DEC: | |
2813 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) | |
2814 | if (ep->to_rtx == XEXP (x, 0)) | |
2815 | { | |
4c05b187 RK |
2816 | int size = GET_MODE_SIZE (mem_mode); |
2817 | ||
2818 | /* If more bytes than MEM_MODE are pushed, account for them. */ | |
2819 | #ifdef PUSH_ROUNDING | |
2820 | if (ep->to_rtx == stack_pointer_rtx) | |
2821 | size = PUSH_ROUNDING (size); | |
2822 | #endif | |
32131a9c | 2823 | if (code == PRE_DEC || code == POST_DEC) |
4c05b187 | 2824 | ep->offset += size; |
32131a9c | 2825 | else |
4c05b187 | 2826 | ep->offset -= size; |
32131a9c RK |
2827 | } |
2828 | ||
2829 | /* Fall through to generic unary operation case. */ | |
32131a9c RK |
2830 | case STRICT_LOW_PART: |
2831 | case NEG: case NOT: | |
2832 | case SIGN_EXTEND: case ZERO_EXTEND: | |
2833 | case TRUNCATE: case FLOAT_EXTEND: case FLOAT_TRUNCATE: | |
2834 | case FLOAT: case FIX: | |
2835 | case UNSIGNED_FIX: case UNSIGNED_FLOAT: | |
2836 | case ABS: | |
2837 | case SQRT: | |
2838 | case FFS: | |
1914f5da | 2839 | new = eliminate_regs (XEXP (x, 0), mem_mode, insn); |
32131a9c | 2840 | if (new != XEXP (x, 0)) |
38a448ca | 2841 | return gen_rtx_fmt_e (code, GET_MODE (x), new); |
32131a9c RK |
2842 | return x; |
2843 | ||
2844 | case SUBREG: | |
2845 | /* Similar to above processing, but preserve SUBREG_WORD. | |
2846 | Convert (subreg (mem)) to (mem) if not paradoxical. | |
2847 | Also, if we have a non-paradoxical (subreg (pseudo)) and the | |
2848 | pseudo didn't get a hard reg, we must replace this with the | |
2849 | eliminated version of the memory location because push_reloads | |
2850 | may do the replacement in certain circumstances. */ | |
2851 | if (GET_CODE (SUBREG_REG (x)) == REG | |
2852 | && (GET_MODE_SIZE (GET_MODE (x)) | |
2853 | <= GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) | |
2854 | && reg_equiv_memory_loc != 0 | |
2855 | && reg_equiv_memory_loc[REGNO (SUBREG_REG (x))] != 0) | |
2856 | { | |
cb2afeb3 | 2857 | #if 0 |
32131a9c | 2858 | new = eliminate_regs (reg_equiv_memory_loc[REGNO (SUBREG_REG (x))], |
1914f5da | 2859 | mem_mode, insn); |
32131a9c RK |
2860 | |
2861 | /* If we didn't change anything, we must retain the pseudo. */ | |
2862 | if (new == reg_equiv_memory_loc[REGNO (SUBREG_REG (x))]) | |
59e2c378 | 2863 | new = SUBREG_REG (x); |
32131a9c | 2864 | else |
59e2c378 | 2865 | { |
59e2c378 RK |
2866 | /* In this case, we must show that the pseudo is used in this |
2867 | insn so that delete_output_reload will do the right thing. */ | |
2868 | if (insn != 0 && GET_CODE (insn) != EXPR_LIST | |
2869 | && GET_CODE (insn) != INSN_LIST) | |
b60a8416 R |
2870 | REG_NOTES (emit_insn_before (gen_rtx_USE (VOIDmode, |
2871 | SUBREG_REG (x)), | |
2872 | insn)) | |
2873 | = gen_rtx_EXPR_LIST (REG_EQUAL, new, NULL_RTX); | |
2874 | ||
2875 | /* Ensure NEW isn't shared in case we have to reload it. */ | |
2876 | new = copy_rtx (new); | |
59e2c378 | 2877 | } |
cb2afeb3 R |
2878 | #else |
2879 | new = SUBREG_REG (x); | |
2880 | #endif | |
32131a9c RK |
2881 | } |
2882 | else | |
1914f5da | 2883 | new = eliminate_regs (SUBREG_REG (x), mem_mode, insn); |
32131a9c RK |
2884 | |
2885 | if (new != XEXP (x, 0)) | |
2886 | { | |
29ae5012 RK |
2887 | int x_size = GET_MODE_SIZE (GET_MODE (x)); |
2888 | int new_size = GET_MODE_SIZE (GET_MODE (new)); | |
2889 | ||
1914f5da | 2890 | if (GET_CODE (new) == MEM |
6d49a073 | 2891 | && ((x_size < new_size |
1914f5da | 2892 | #ifdef WORD_REGISTER_OPERATIONS |
6d49a073 JW |
2893 | /* On these machines, combine can create rtl of the form |
2894 | (set (subreg:m1 (reg:m2 R) 0) ...) | |
2895 | where m1 < m2, and expects something interesting to | |
2896 | happen to the entire word. Moreover, it will use the | |
2897 | (reg:m2 R) later, expecting all bits to be preserved. | |
2898 | So if the number of words is the same, preserve the | |
2899 | subreg so that push_reloads can see it. */ | |
2900 | && ! ((x_size-1)/UNITS_PER_WORD == (new_size-1)/UNITS_PER_WORD) | |
1914f5da | 2901 | #endif |
6d49a073 JW |
2902 | ) |
2903 | || (x_size == new_size)) | |
1914f5da | 2904 | ) |
32131a9c RK |
2905 | { |
2906 | int offset = SUBREG_WORD (x) * UNITS_PER_WORD; | |
2907 | enum machine_mode mode = GET_MODE (x); | |
2908 | ||
f76b9db2 ILT |
2909 | if (BYTES_BIG_ENDIAN) |
2910 | offset += (MIN (UNITS_PER_WORD, | |
2911 | GET_MODE_SIZE (GET_MODE (new))) | |
2912 | - MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))); | |
32131a9c RK |
2913 | |
2914 | PUT_MODE (new, mode); | |
2915 | XEXP (new, 0) = plus_constant (XEXP (new, 0), offset); | |
2916 | return new; | |
2917 | } | |
2918 | else | |
38a448ca | 2919 | return gen_rtx_SUBREG (GET_MODE (x), new, SUBREG_WORD (x)); |
32131a9c RK |
2920 | } |
2921 | ||
2922 | return x; | |
2923 | ||
94714ecc RK |
2924 | case USE: |
2925 | /* If using a register that is the source of an eliminate we still | |
2926 | think can be performed, note it cannot be performed since we don't | |
2927 | know how this register is used. */ | |
2928 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) | |
2929 | if (ep->from_rtx == XEXP (x, 0)) | |
2930 | ep->can_eliminate = 0; | |
2931 | ||
1914f5da | 2932 | new = eliminate_regs (XEXP (x, 0), mem_mode, insn); |
94714ecc | 2933 | if (new != XEXP (x, 0)) |
38a448ca | 2934 | return gen_rtx_fmt_e (code, GET_MODE (x), new); |
94714ecc RK |
2935 | return x; |
2936 | ||
32131a9c RK |
2937 | case CLOBBER: |
2938 | /* If clobbering a register that is the replacement register for an | |
d45cf215 | 2939 | elimination we still think can be performed, note that it cannot |
32131a9c RK |
2940 | be performed. Otherwise, we need not be concerned about it. */ |
2941 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) | |
2942 | if (ep->to_rtx == XEXP (x, 0)) | |
2943 | ep->can_eliminate = 0; | |
2944 | ||
1914f5da | 2945 | new = eliminate_regs (XEXP (x, 0), mem_mode, insn); |
2045084c | 2946 | if (new != XEXP (x, 0)) |
38a448ca | 2947 | return gen_rtx_fmt_e (code, GET_MODE (x), new); |
32131a9c RK |
2948 | return x; |
2949 | ||
2950 | case ASM_OPERANDS: | |
2951 | { | |
2952 | rtx *temp_vec; | |
2953 | /* Properly handle sharing input and constraint vectors. */ | |
2954 | if (ASM_OPERANDS_INPUT_VEC (x) != old_asm_operands_vec) | |
2955 | { | |
2956 | /* When we come to a new vector not seen before, | |
2957 | scan all its elements; keep the old vector if none | |
2958 | of them changes; otherwise, make a copy. */ | |
2959 | old_asm_operands_vec = ASM_OPERANDS_INPUT_VEC (x); | |
2960 | temp_vec = (rtx *) alloca (XVECLEN (x, 3) * sizeof (rtx)); | |
2961 | for (i = 0; i < ASM_OPERANDS_INPUT_LENGTH (x); i++) | |
2962 | temp_vec[i] = eliminate_regs (ASM_OPERANDS_INPUT (x, i), | |
1914f5da | 2963 | mem_mode, insn); |
32131a9c RK |
2964 | |
2965 | for (i = 0; i < ASM_OPERANDS_INPUT_LENGTH (x); i++) | |
2966 | if (temp_vec[i] != ASM_OPERANDS_INPUT (x, i)) | |
2967 | break; | |
2968 | ||
2969 | if (i == ASM_OPERANDS_INPUT_LENGTH (x)) | |
2970 | new_asm_operands_vec = old_asm_operands_vec; | |
2971 | else | |
2972 | new_asm_operands_vec | |
2973 | = gen_rtvec_v (ASM_OPERANDS_INPUT_LENGTH (x), temp_vec); | |
2974 | } | |
2975 | ||
2976 | /* If we had to copy the vector, copy the entire ASM_OPERANDS. */ | |
2977 | if (new_asm_operands_vec == old_asm_operands_vec) | |
2978 | return x; | |
2979 | ||
38a448ca RH |
2980 | new = gen_rtx_ASM_OPERANDS (VOIDmode, ASM_OPERANDS_TEMPLATE (x), |
2981 | ASM_OPERANDS_OUTPUT_CONSTRAINT (x), | |
2982 | ASM_OPERANDS_OUTPUT_IDX (x), | |
2983 | new_asm_operands_vec, | |
2984 | ASM_OPERANDS_INPUT_CONSTRAINT_VEC (x), | |
2985 | ASM_OPERANDS_SOURCE_FILE (x), | |
2986 | ASM_OPERANDS_SOURCE_LINE (x)); | |
32131a9c RK |
2987 | new->volatil = x->volatil; |
2988 | return new; | |
2989 | } | |
2990 | ||
2991 | case SET: | |
2992 | /* Check for setting a register that we know about. */ | |
2993 | if (GET_CODE (SET_DEST (x)) == REG) | |
2994 | { | |
2995 | /* See if this is setting the replacement register for an | |
a8fdc208 | 2996 | elimination. |
32131a9c | 2997 | |
3ec2ea3e DE |
2998 | If DEST is the hard frame pointer, we do nothing because we |
2999 | assume that all assignments to the frame pointer are for | |
3000 | non-local gotos and are being done at a time when they are valid | |
3001 | and do not disturb anything else. Some machines want to | |
3002 | eliminate a fake argument pointer (or even a fake frame pointer) | |
3003 | with either the real frame or the stack pointer. Assignments to | |
3004 | the hard frame pointer must not prevent this elimination. */ | |
32131a9c RK |
3005 | |
3006 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; | |
3007 | ep++) | |
3008 | if (ep->to_rtx == SET_DEST (x) | |
3ec2ea3e | 3009 | && SET_DEST (x) != hard_frame_pointer_rtx) |
32131a9c | 3010 | { |
6dc42e49 | 3011 | /* If it is being incremented, adjust the offset. Otherwise, |
32131a9c RK |
3012 | this elimination can't be done. */ |
3013 | rtx src = SET_SRC (x); | |
3014 | ||
3015 | if (GET_CODE (src) == PLUS | |
3016 | && XEXP (src, 0) == SET_DEST (x) | |
3017 | && GET_CODE (XEXP (src, 1)) == CONST_INT) | |
3018 | ep->offset -= INTVAL (XEXP (src, 1)); | |
3019 | else | |
3020 | ep->can_eliminate = 0; | |
3021 | } | |
3022 | ||
3023 | /* Now check to see we are assigning to a register that can be | |
3024 | eliminated. If so, it must be as part of a PARALLEL, since we | |
3025 | will not have been called if this is a single SET. So indicate | |
3026 | that we can no longer eliminate this reg. */ | |
3027 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; | |
3028 | ep++) | |
3029 | if (ep->from_rtx == SET_DEST (x) && ep->can_eliminate) | |
3030 | ep->can_eliminate = 0; | |
3031 | } | |
3032 | ||
3033 | /* Now avoid the loop below in this common case. */ | |
3034 | { | |
1914f5da RH |
3035 | rtx new0 = eliminate_regs (SET_DEST (x), 0, insn); |
3036 | rtx new1 = eliminate_regs (SET_SRC (x), 0, insn); | |
32131a9c | 3037 | |
ff32812a | 3038 | /* If SET_DEST changed from a REG to a MEM and INSN is an insn, |
32131a9c RK |
3039 | write a CLOBBER insn. */ |
3040 | if (GET_CODE (SET_DEST (x)) == REG && GET_CODE (new0) == MEM | |
572ca60a RS |
3041 | && insn != 0 && GET_CODE (insn) != EXPR_LIST |
3042 | && GET_CODE (insn) != INSN_LIST) | |
38a448ca | 3043 | emit_insn_after (gen_rtx_CLOBBER (VOIDmode, SET_DEST (x)), insn); |
32131a9c RK |
3044 | |
3045 | if (new0 != SET_DEST (x) || new1 != SET_SRC (x)) | |
38a448ca | 3046 | return gen_rtx_SET (VOIDmode, new0, new1); |
32131a9c RK |
3047 | } |
3048 | ||
3049 | return x; | |
3050 | ||
3051 | case MEM: | |
e9a25f70 JL |
3052 | /* This is only for the benefit of the debugging backends, which call |
3053 | eliminate_regs on DECL_RTL; any ADDRESSOFs in the actual insns are | |
3054 | removed after CSE. */ | |
3055 | if (GET_CODE (XEXP (x, 0)) == ADDRESSOF) | |
1914f5da | 3056 | return eliminate_regs (XEXP (XEXP (x, 0), 0), 0, insn); |
e9a25f70 | 3057 | |
32131a9c RK |
3058 | /* Our only special processing is to pass the mode of the MEM to our |
3059 | recursive call and copy the flags. While we are here, handle this | |
3060 | case more efficiently. */ | |
1914f5da | 3061 | new = eliminate_regs (XEXP (x, 0), GET_MODE (x), insn); |
32131a9c RK |
3062 | if (new != XEXP (x, 0)) |
3063 | { | |
38a448ca | 3064 | new = gen_rtx_MEM (GET_MODE (x), new); |
32131a9c RK |
3065 | new->volatil = x->volatil; |
3066 | new->unchanging = x->unchanging; | |
3067 | new->in_struct = x->in_struct; | |
3068 | return new; | |
3069 | } | |
3070 | else | |
3071 | return x; | |
e9a25f70 JL |
3072 | |
3073 | default: | |
3074 | break; | |
32131a9c RK |
3075 | } |
3076 | ||
3077 | /* Process each of our operands recursively. If any have changed, make a | |
3078 | copy of the rtx. */ | |
3079 | fmt = GET_RTX_FORMAT (code); | |
3080 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
3081 | { | |
3082 | if (*fmt == 'e') | |
3083 | { | |
1914f5da | 3084 | new = eliminate_regs (XEXP (x, i), mem_mode, insn); |
32131a9c RK |
3085 | if (new != XEXP (x, i) && ! copied) |
3086 | { | |
3087 | rtx new_x = rtx_alloc (code); | |
4c9a05bc RK |
3088 | bcopy ((char *) x, (char *) new_x, |
3089 | (sizeof (*new_x) - sizeof (new_x->fld) | |
3090 | + sizeof (new_x->fld[0]) * GET_RTX_LENGTH (code))); | |
32131a9c RK |
3091 | x = new_x; |
3092 | copied = 1; | |
3093 | } | |
3094 | XEXP (x, i) = new; | |
3095 | } | |
3096 | else if (*fmt == 'E') | |
3097 | { | |
3098 | int copied_vec = 0; | |
3099 | for (j = 0; j < XVECLEN (x, i); j++) | |
3100 | { | |
1914f5da | 3101 | new = eliminate_regs (XVECEXP (x, i, j), mem_mode, insn); |
32131a9c RK |
3102 | if (new != XVECEXP (x, i, j) && ! copied_vec) |
3103 | { | |
27108369 RK |
3104 | rtvec new_v = gen_rtvec_vv (XVECLEN (x, i), |
3105 | XVEC (x, i)->elem); | |
32131a9c RK |
3106 | if (! copied) |
3107 | { | |
3108 | rtx new_x = rtx_alloc (code); | |
4c9a05bc RK |
3109 | bcopy ((char *) x, (char *) new_x, |
3110 | (sizeof (*new_x) - sizeof (new_x->fld) | |
3111 | + (sizeof (new_x->fld[0]) | |
3112 | * GET_RTX_LENGTH (code)))); | |
32131a9c RK |
3113 | x = new_x; |
3114 | copied = 1; | |
3115 | } | |
3116 | XVEC (x, i) = new_v; | |
3117 | copied_vec = 1; | |
3118 | } | |
3119 | XVECEXP (x, i, j) = new; | |
3120 | } | |
3121 | } | |
3122 | } | |
3123 | ||
3124 | return x; | |
3125 | } | |
3126 | \f | |
3127 | /* Scan INSN and eliminate all eliminable registers in it. | |
3128 | ||
3129 | If REPLACE is nonzero, do the replacement destructively. Also | |
3130 | delete the insn as dead it if it is setting an eliminable register. | |
3131 | ||
3132 | If REPLACE is zero, do all our allocations in reload_obstack. | |
3133 | ||
3134 | If no eliminations were done and this insn doesn't require any elimination | |
3135 | processing (these are not identical conditions: it might be updating sp, | |
3136 | but not referencing fp; this needs to be seen during reload_as_needed so | |
3137 | that the offset between fp and sp can be taken into consideration), zero | |
3138 | is returned. Otherwise, 1 is returned. */ | |
3139 | ||
3140 | static int | |
3141 | eliminate_regs_in_insn (insn, replace) | |
3142 | rtx insn; | |
3143 | int replace; | |
3144 | { | |
3145 | rtx old_body = PATTERN (insn); | |
774672d2 | 3146 | rtx old_set = single_set (insn); |
32131a9c RK |
3147 | rtx new_body; |
3148 | int val = 0; | |
3149 | struct elim_table *ep; | |
3150 | ||
3151 | if (! replace) | |
3152 | push_obstacks (&reload_obstack, &reload_obstack); | |
3153 | ||
774672d2 RK |
3154 | if (old_set != 0 && GET_CODE (SET_DEST (old_set)) == REG |
3155 | && REGNO (SET_DEST (old_set)) < FIRST_PSEUDO_REGISTER) | |
32131a9c RK |
3156 | { |
3157 | /* Check for setting an eliminable register. */ | |
3158 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) | |
774672d2 | 3159 | if (ep->from_rtx == SET_DEST (old_set) && ep->can_eliminate) |
32131a9c | 3160 | { |
dd1eab0a RK |
3161 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM |
3162 | /* If this is setting the frame pointer register to the | |
3163 | hardware frame pointer register and this is an elimination | |
3164 | that will be done (tested above), this insn is really | |
3165 | adjusting the frame pointer downward to compensate for | |
3166 | the adjustment done before a nonlocal goto. */ | |
3167 | if (ep->from == FRAME_POINTER_REGNUM | |
3168 | && ep->to == HARD_FRAME_POINTER_REGNUM) | |
3169 | { | |
3170 | rtx src = SET_SRC (old_set); | |
3171 | int offset, ok = 0; | |
8026ebba | 3172 | rtx prev_insn, prev_set; |
dd1eab0a RK |
3173 | |
3174 | if (src == ep->to_rtx) | |
3175 | offset = 0, ok = 1; | |
3176 | else if (GET_CODE (src) == PLUS | |
bb22893c JW |
3177 | && GET_CODE (XEXP (src, 0)) == CONST_INT |
3178 | && XEXP (src, 1) == ep->to_rtx) | |
dd1eab0a | 3179 | offset = INTVAL (XEXP (src, 0)), ok = 1; |
bb22893c JW |
3180 | else if (GET_CODE (src) == PLUS |
3181 | && GET_CODE (XEXP (src, 1)) == CONST_INT | |
3182 | && XEXP (src, 0) == ep->to_rtx) | |
3183 | offset = INTVAL (XEXP (src, 1)), ok = 1; | |
8026ebba ILT |
3184 | else if ((prev_insn = prev_nonnote_insn (insn)) != 0 |
3185 | && (prev_set = single_set (prev_insn)) != 0 | |
3186 | && rtx_equal_p (SET_DEST (prev_set), src)) | |
3187 | { | |
3188 | src = SET_SRC (prev_set); | |
3189 | if (src == ep->to_rtx) | |
3190 | offset = 0, ok = 1; | |
3191 | else if (GET_CODE (src) == PLUS | |
3192 | && GET_CODE (XEXP (src, 0)) == CONST_INT | |
3193 | && XEXP (src, 1) == ep->to_rtx) | |
3194 | offset = INTVAL (XEXP (src, 0)), ok = 1; | |
3195 | else if (GET_CODE (src) == PLUS | |
3196 | && GET_CODE (XEXP (src, 1)) == CONST_INT | |
3197 | && XEXP (src, 0) == ep->to_rtx) | |
3198 | offset = INTVAL (XEXP (src, 1)), ok = 1; | |
3199 | } | |
dd1eab0a RK |
3200 | |
3201 | if (ok) | |
3202 | { | |
3203 | if (replace) | |
3204 | { | |
3205 | rtx src | |
3206 | = plus_constant (ep->to_rtx, offset - ep->offset); | |
3207 | ||
3208 | /* First see if this insn remains valid when we | |
3209 | make the change. If not, keep the INSN_CODE | |
3210 | the same and let reload fit it up. */ | |
3211 | validate_change (insn, &SET_SRC (old_set), src, 1); | |
3212 | validate_change (insn, &SET_DEST (old_set), | |
3213 | ep->to_rtx, 1); | |
3214 | if (! apply_change_group ()) | |
3215 | { | |
3216 | SET_SRC (old_set) = src; | |
3217 | SET_DEST (old_set) = ep->to_rtx; | |
3218 | } | |
3219 | } | |
3220 | ||
3221 | val = 1; | |
3222 | goto done; | |
3223 | } | |
3224 | } | |
3225 | #endif | |
3226 | ||
32131a9c RK |
3227 | /* In this case this insn isn't serving a useful purpose. We |
3228 | will delete it in reload_as_needed once we know that this | |
3229 | elimination is, in fact, being done. | |
3230 | ||
abc95ed3 | 3231 | If REPLACE isn't set, we can't delete this insn, but needn't |
32131a9c RK |
3232 | process it since it won't be used unless something changes. */ |
3233 | if (replace) | |
3234 | delete_dead_insn (insn); | |
3235 | val = 1; | |
3236 | goto done; | |
3237 | } | |
3238 | ||
3239 | /* Check for (set (reg) (plus (reg from) (offset))) where the offset | |
3240 | in the insn is the negative of the offset in FROM. Substitute | |
3241 | (set (reg) (reg to)) for the insn and change its code. | |
3242 | ||
cb2afeb3 | 3243 | We have to do this here, rather than in eliminate_regs, so that we can |
32131a9c RK |
3244 | change the insn code. */ |
3245 | ||
774672d2 RK |
3246 | if (GET_CODE (SET_SRC (old_set)) == PLUS |
3247 | && GET_CODE (XEXP (SET_SRC (old_set), 0)) == REG | |
3248 | && GET_CODE (XEXP (SET_SRC (old_set), 1)) == CONST_INT) | |
32131a9c RK |
3249 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; |
3250 | ep++) | |
774672d2 | 3251 | if (ep->from_rtx == XEXP (SET_SRC (old_set), 0) |
922d9d40 | 3252 | && ep->can_eliminate) |
32131a9c | 3253 | { |
922d9d40 RK |
3254 | /* We must stop at the first elimination that will be used. |
3255 | If this one would replace the PLUS with a REG, do it | |
3256 | now. Otherwise, quit the loop and let eliminate_regs | |
3257 | do its normal replacement. */ | |
774672d2 | 3258 | if (ep->offset == - INTVAL (XEXP (SET_SRC (old_set), 1))) |
922d9d40 | 3259 | { |
774672d2 RK |
3260 | /* We assume here that we don't need a PARALLEL of |
3261 | any CLOBBERs for this assignment. There's not | |
3262 | much we can do if we do need it. */ | |
38a448ca RH |
3263 | PATTERN (insn) = gen_rtx_SET (VOIDmode, |
3264 | SET_DEST (old_set), | |
3265 | ep->to_rtx); | |
922d9d40 RK |
3266 | INSN_CODE (insn) = -1; |
3267 | val = 1; | |
3268 | goto done; | |
3269 | } | |
3270 | ||
3271 | break; | |
32131a9c RK |
3272 | } |
3273 | } | |
3274 | ||
3275 | old_asm_operands_vec = 0; | |
3276 | ||
3277 | /* Replace the body of this insn with a substituted form. If we changed | |
05b4c365 | 3278 | something, return non-zero. |
32131a9c RK |
3279 | |
3280 | If we are replacing a body that was a (set X (plus Y Z)), try to | |
3281 | re-recognize the insn. We do this in case we had a simple addition | |
3282 | but now can do this as a load-address. This saves an insn in this | |
0f41302f | 3283 | common case. */ |
32131a9c | 3284 | |
1914f5da | 3285 | new_body = eliminate_regs (old_body, 0, replace ? insn : NULL_RTX); |
32131a9c RK |
3286 | if (new_body != old_body) |
3287 | { | |
7c791b13 RK |
3288 | /* If we aren't replacing things permanently and we changed something, |
3289 | make another copy to ensure that all the RTL is new. Otherwise | |
3290 | things can go wrong if find_reload swaps commutative operands | |
0f41302f | 3291 | and one is inside RTL that has been copied while the other is not. */ |
7c791b13 | 3292 | |
4d411872 RS |
3293 | /* Don't copy an asm_operands because (1) there's no need and (2) |
3294 | copy_rtx can't do it properly when there are multiple outputs. */ | |
b84f9d9c | 3295 | if (! replace && asm_noperands (old_body) < 0) |
7c791b13 RK |
3296 | new_body = copy_rtx (new_body); |
3297 | ||
774672d2 RK |
3298 | /* If we had a move insn but now we don't, rerecognize it. This will |
3299 | cause spurious re-recognition if the old move had a PARALLEL since | |
3300 | the new one still will, but we can't call single_set without | |
3301 | having put NEW_BODY into the insn and the re-recognition won't | |
3302 | hurt in this rare case. */ | |
3303 | if (old_set != 0 | |
3304 | && ((GET_CODE (SET_SRC (old_set)) == REG | |
3305 | && (GET_CODE (new_body) != SET | |
3306 | || GET_CODE (SET_SRC (new_body)) != REG)) | |
3307 | /* If this was a load from or store to memory, compare | |
3308 | the MEM in recog_operand to the one in the insn. If they | |
3309 | are not equal, then rerecognize the insn. */ | |
3310 | || (old_set != 0 | |
3311 | && ((GET_CODE (SET_SRC (old_set)) == MEM | |
3312 | && SET_SRC (old_set) != recog_operand[1]) | |
3313 | || (GET_CODE (SET_DEST (old_set)) == MEM | |
3314 | && SET_DEST (old_set) != recog_operand[0]))) | |
3315 | /* If this was an add insn before, rerecognize. */ | |
3316 | || GET_CODE (SET_SRC (old_set)) == PLUS)) | |
4a5d0fb5 RS |
3317 | { |
3318 | if (! validate_change (insn, &PATTERN (insn), new_body, 0)) | |
0ba846c7 RS |
3319 | /* If recognition fails, store the new body anyway. |
3320 | It's normal to have recognition failures here | |
3321 | due to bizarre memory addresses; reloading will fix them. */ | |
3322 | PATTERN (insn) = new_body; | |
4a5d0fb5 | 3323 | } |
0ba846c7 | 3324 | else |
32131a9c RK |
3325 | PATTERN (insn) = new_body; |
3326 | ||
32131a9c RK |
3327 | val = 1; |
3328 | } | |
a8fdc208 | 3329 | |
cb2afeb3 | 3330 | /* Loop through all elimination pairs. See if any have changed. |
a8efe40d | 3331 | |
32131a9c RK |
3332 | We also detect a cases where register elimination cannot be done, |
3333 | namely, if a register would be both changed and referenced outside a MEM | |
3334 | in the resulting insn since such an insn is often undefined and, even if | |
3335 | not, we cannot know what meaning will be given to it. Note that it is | |
3336 | valid to have a register used in an address in an insn that changes it | |
3337 | (presumably with a pre- or post-increment or decrement). | |
3338 | ||
3339 | If anything changes, return nonzero. */ | |
3340 | ||
32131a9c RK |
3341 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) |
3342 | { | |
3343 | if (ep->previous_offset != ep->offset && ep->ref_outside_mem) | |
3344 | ep->can_eliminate = 0; | |
3345 | ||
3346 | ep->ref_outside_mem = 0; | |
3347 | ||
3348 | if (ep->previous_offset != ep->offset) | |
3349 | val = 1; | |
32131a9c RK |
3350 | } |
3351 | ||
3352 | done: | |
9faa82d8 | 3353 | /* If we changed something, perform elimination in REG_NOTES. This is |
05b4c365 RK |
3354 | needed even when REPLACE is zero because a REG_DEAD note might refer |
3355 | to a register that we eliminate and could cause a different number | |
3356 | of spill registers to be needed in the final reload pass than in | |
3357 | the pre-passes. */ | |
20748cab | 3358 | if (val && REG_NOTES (insn) != 0) |
1914f5da | 3359 | REG_NOTES (insn) = eliminate_regs (REG_NOTES (insn), 0, REG_NOTES (insn)); |
05b4c365 | 3360 | |
32131a9c RK |
3361 | if (! replace) |
3362 | pop_obstacks (); | |
3363 | ||
3364 | return val; | |
3365 | } | |
3366 | ||
cb2afeb3 R |
3367 | /* Loop through all elimination pairs. |
3368 | Recalculate the number not at initial offset. | |
3369 | ||
3370 | Compute the maximum offset (minimum offset if the stack does not | |
3371 | grow downward) for each elimination pair. */ | |
3372 | ||
3373 | static void | |
3374 | update_eliminable_offsets () | |
3375 | { | |
3376 | struct elim_table *ep; | |
3377 | ||
3378 | num_not_at_initial_offset = 0; | |
3379 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) | |
3380 | { | |
3381 | ep->previous_offset = ep->offset; | |
3382 | if (ep->can_eliminate && ep->offset != ep->initial_offset) | |
3383 | num_not_at_initial_offset++; | |
3384 | ||
3385 | #ifdef STACK_GROWS_DOWNWARD | |
3386 | ep->max_offset = MAX (ep->max_offset, ep->offset); | |
3387 | #else | |
3388 | ep->max_offset = MIN (ep->max_offset, ep->offset); | |
3389 | #endif | |
3390 | } | |
3391 | } | |
3392 | ||
32131a9c RK |
3393 | /* Given X, a SET or CLOBBER of DEST, if DEST is the target of a register |
3394 | replacement we currently believe is valid, mark it as not eliminable if X | |
3395 | modifies DEST in any way other than by adding a constant integer to it. | |
3396 | ||
3397 | If DEST is the frame pointer, we do nothing because we assume that | |
3ec2ea3e DE |
3398 | all assignments to the hard frame pointer are nonlocal gotos and are being |
3399 | done at a time when they are valid and do not disturb anything else. | |
32131a9c | 3400 | Some machines want to eliminate a fake argument pointer with either the |
3ec2ea3e DE |
3401 | frame or stack pointer. Assignments to the hard frame pointer must not |
3402 | prevent this elimination. | |
32131a9c RK |
3403 | |
3404 | Called via note_stores from reload before starting its passes to scan | |
3405 | the insns of the function. */ | |
3406 | ||
3407 | static void | |
3408 | mark_not_eliminable (dest, x) | |
3409 | rtx dest; | |
3410 | rtx x; | |
3411 | { | |
e51712db | 3412 | register unsigned int i; |
32131a9c RK |
3413 | |
3414 | /* A SUBREG of a hard register here is just changing its mode. We should | |
3415 | not see a SUBREG of an eliminable hard register, but check just in | |
3416 | case. */ | |
3417 | if (GET_CODE (dest) == SUBREG) | |
3418 | dest = SUBREG_REG (dest); | |
3419 | ||
3ec2ea3e | 3420 | if (dest == hard_frame_pointer_rtx) |
32131a9c RK |
3421 | return; |
3422 | ||
3423 | for (i = 0; i < NUM_ELIMINABLE_REGS; i++) | |
3424 | if (reg_eliminate[i].can_eliminate && dest == reg_eliminate[i].to_rtx | |
3425 | && (GET_CODE (x) != SET | |
3426 | || GET_CODE (SET_SRC (x)) != PLUS | |
3427 | || XEXP (SET_SRC (x), 0) != dest | |
3428 | || GET_CODE (XEXP (SET_SRC (x), 1)) != CONST_INT)) | |
3429 | { | |
3430 | reg_eliminate[i].can_eliminate_previous | |
3431 | = reg_eliminate[i].can_eliminate = 0; | |
3432 | num_eliminable--; | |
3433 | } | |
3434 | } | |
09dd1133 | 3435 | |
c47f5ea5 BS |
3436 | /* Verify that the initial elimination offsets did not change since the |
3437 | last call to set_initial_elim_offsets. This is used to catch cases | |
3438 | where something illegal happened during reload_as_needed that could | |
3439 | cause incorrect code to be generated if we did not check for it. */ | |
3440 | static void | |
3441 | verify_initial_elim_offsets () | |
3442 | { | |
3443 | int t; | |
3444 | ||
3445 | #ifdef ELIMINABLE_REGS | |
3446 | struct elim_table *ep; | |
3447 | ||
3448 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) | |
3449 | { | |
3450 | INITIAL_ELIMINATION_OFFSET (ep->from, ep->to, t); | |
3451 | if (t != ep->initial_offset) | |
3452 | abort (); | |
3453 | } | |
3454 | #else | |
3455 | INITIAL_FRAME_POINTER_OFFSET (t); | |
3456 | if (t != reg_eliminate[0].initial_offset) | |
3457 | abort (); | |
3458 | #endif | |
3459 | } | |
3460 | ||
09dd1133 BS |
3461 | /* Reset all offsets on eliminable registers to their initial values. */ |
3462 | static void | |
3463 | set_initial_elim_offsets () | |
3464 | { | |
3465 | rtx x; | |
3466 | ||
3467 | #ifdef ELIMINABLE_REGS | |
3468 | struct elim_table *ep; | |
3469 | ||
3470 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) | |
3471 | { | |
3472 | INITIAL_ELIMINATION_OFFSET (ep->from, ep->to, ep->initial_offset); | |
3473 | ep->previous_offset = ep->offset | |
3474 | = ep->max_offset = ep->initial_offset; | |
3475 | } | |
3476 | #else | |
3477 | #ifdef INITIAL_FRAME_POINTER_OFFSET | |
3478 | INITIAL_FRAME_POINTER_OFFSET (reg_eliminate[0].initial_offset); | |
3479 | #else | |
3480 | if (!FRAME_POINTER_REQUIRED) | |
3481 | abort (); | |
3482 | reg_eliminate[0].initial_offset = 0; | |
3483 | #endif | |
3484 | reg_eliminate[0].previous_offset = reg_eliminate[0].max_offset | |
3485 | = reg_eliminate[0].offset = reg_eliminate[0].initial_offset; | |
3486 | #endif | |
3487 | ||
3488 | num_not_at_initial_offset = 0; | |
3489 | ||
3490 | bzero ((char *) &offsets_known_at[get_first_label_num ()], num_labels); | |
3491 | ||
3492 | /* Set a known offset for each forced label to be at the initial offset | |
3493 | of each elimination. We do this because we assume that all | |
3494 | computed jumps occur from a location where each elimination is | |
3495 | at its initial offset. */ | |
3496 | ||
3497 | for (x = forced_labels; x; x = XEXP (x, 1)) | |
3498 | if (XEXP (x, 0)) | |
3499 | set_label_offsets (XEXP (x, 0), NULL_RTX, 1); | |
3500 | } | |
3501 | ||
3502 | /* See if anything that happened changes which eliminations are valid. | |
3503 | For example, on the Sparc, whether or not the frame pointer can | |
3504 | be eliminated can depend on what registers have been used. We need | |
3505 | not check some conditions again (such as flag_omit_frame_pointer) | |
3506 | since they can't have changed. */ | |
3507 | ||
3508 | static void | |
3509 | update_eliminables (pset) | |
3510 | HARD_REG_SET *pset; | |
3511 | { | |
3512 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
3513 | int previous_frame_pointer_needed = frame_pointer_needed; | |
3514 | #endif | |
3515 | struct elim_table *ep; | |
3516 | ||
3517 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) | |
3518 | if ((ep->from == HARD_FRAME_POINTER_REGNUM && FRAME_POINTER_REQUIRED) | |
3519 | #ifdef ELIMINABLE_REGS | |
3520 | || ! CAN_ELIMINATE (ep->from, ep->to) | |
3521 | #endif | |
3522 | ) | |
3523 | ep->can_eliminate = 0; | |
3524 | ||
3525 | /* Look for the case where we have discovered that we can't replace | |
3526 | register A with register B and that means that we will now be | |
3527 | trying to replace register A with register C. This means we can | |
3528 | no longer replace register C with register B and we need to disable | |
3529 | such an elimination, if it exists. This occurs often with A == ap, | |
3530 | B == sp, and C == fp. */ | |
3531 | ||
3532 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) | |
3533 | { | |
3534 | struct elim_table *op; | |
3535 | register int new_to = -1; | |
3536 | ||
3537 | if (! ep->can_eliminate && ep->can_eliminate_previous) | |
3538 | { | |
3539 | /* Find the current elimination for ep->from, if there is a | |
3540 | new one. */ | |
3541 | for (op = reg_eliminate; | |
3542 | op < ®_eliminate[NUM_ELIMINABLE_REGS]; op++) | |
3543 | if (op->from == ep->from && op->can_eliminate) | |
3544 | { | |
3545 | new_to = op->to; | |
3546 | break; | |
3547 | } | |
3548 | ||
3549 | /* See if there is an elimination of NEW_TO -> EP->TO. If so, | |
3550 | disable it. */ | |
3551 | for (op = reg_eliminate; | |
3552 | op < ®_eliminate[NUM_ELIMINABLE_REGS]; op++) | |
3553 | if (op->from == new_to && op->to == ep->to) | |
3554 | op->can_eliminate = 0; | |
3555 | } | |
3556 | } | |
3557 | ||
3558 | /* See if any registers that we thought we could eliminate the previous | |
3559 | time are no longer eliminable. If so, something has changed and we | |
3560 | must spill the register. Also, recompute the number of eliminable | |
3561 | registers and see if the frame pointer is needed; it is if there is | |
3562 | no elimination of the frame pointer that we can perform. */ | |
3563 | ||
3564 | frame_pointer_needed = 1; | |
3565 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) | |
3566 | { | |
3567 | if (ep->can_eliminate && ep->from == FRAME_POINTER_REGNUM | |
3568 | && ep->to != HARD_FRAME_POINTER_REGNUM) | |
3569 | frame_pointer_needed = 0; | |
3570 | ||
3571 | if (! ep->can_eliminate && ep->can_eliminate_previous) | |
3572 | { | |
3573 | ep->can_eliminate_previous = 0; | |
3574 | SET_HARD_REG_BIT (*pset, ep->from); | |
3575 | num_eliminable--; | |
3576 | } | |
3577 | } | |
3578 | ||
3579 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
3580 | /* If we didn't need a frame pointer last time, but we do now, spill | |
3581 | the hard frame pointer. */ | |
3582 | if (frame_pointer_needed && ! previous_frame_pointer_needed) | |
3583 | SET_HARD_REG_BIT (*pset, HARD_FRAME_POINTER_REGNUM); | |
3584 | #endif | |
3585 | } | |
3586 | ||
3587 | /* Initialize the table of registers to eliminate. */ | |
3588 | static void | |
3589 | init_elim_table () | |
3590 | { | |
3591 | struct elim_table *ep; | |
3592 | ||
3593 | /* Does this function require a frame pointer? */ | |
3594 | ||
3595 | frame_pointer_needed = (! flag_omit_frame_pointer | |
3596 | #ifdef EXIT_IGNORE_STACK | |
3597 | /* ?? If EXIT_IGNORE_STACK is set, we will not save | |
3598 | and restore sp for alloca. So we can't eliminate | |
3599 | the frame pointer in that case. At some point, | |
3600 | we should improve this by emitting the | |
3601 | sp-adjusting insns for this case. */ | |
3602 | || (current_function_calls_alloca | |
3603 | && EXIT_IGNORE_STACK) | |
3604 | #endif | |
3605 | || FRAME_POINTER_REQUIRED); | |
3606 | ||
3607 | num_eliminable = 0; | |
3608 | ||
3609 | #ifdef ELIMINABLE_REGS | |
3610 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) | |
3611 | { | |
3612 | ep->can_eliminate = ep->can_eliminate_previous | |
3613 | = (CAN_ELIMINATE (ep->from, ep->to) | |
3614 | && ! (ep->to == STACK_POINTER_REGNUM && frame_pointer_needed)); | |
3615 | } | |
3616 | #else | |
3617 | reg_eliminate[0].can_eliminate = reg_eliminate[0].can_eliminate_previous | |
3618 | = ! frame_pointer_needed; | |
3619 | #endif | |
3620 | ||
3621 | /* Count the number of eliminable registers and build the FROM and TO | |
3622 | REG rtx's. Note that code in gen_rtx will cause, e.g., | |
3623 | gen_rtx (REG, Pmode, STACK_POINTER_REGNUM) to equal stack_pointer_rtx. | |
3624 | We depend on this. */ | |
3625 | for (ep = reg_eliminate; ep < ®_eliminate[NUM_ELIMINABLE_REGS]; ep++) | |
3626 | { | |
3627 | num_eliminable += ep->can_eliminate; | |
3628 | ep->from_rtx = gen_rtx_REG (Pmode, ep->from); | |
3629 | ep->to_rtx = gen_rtx_REG (Pmode, ep->to); | |
3630 | } | |
3631 | } | |
32131a9c RK |
3632 | \f |
3633 | /* Kick all pseudos out of hard register REGNO. | |
32131a9c RK |
3634 | If DUMPFILE is nonzero, log actions taken on that file. |
3635 | ||
3636 | If CANT_ELIMINATE is nonzero, it means that we are doing this spill | |
3637 | because we found we can't eliminate some register. In the case, no pseudos | |
3638 | are allowed to be in the register, even if they are only in a block that | |
3639 | doesn't require spill registers, unlike the case when we are spilling this | |
3640 | hard reg to produce another spill register. | |
3641 | ||
3642 | Return nonzero if any pseudos needed to be kicked out. */ | |
3643 | ||
03acd8f8 BS |
3644 | static void |
3645 | spill_hard_reg (regno, dumpfile, cant_eliminate) | |
32131a9c | 3646 | register int regno; |
32131a9c RK |
3647 | FILE *dumpfile; |
3648 | int cant_eliminate; | |
3649 | { | |
32131a9c RK |
3650 | register int i; |
3651 | ||
9ff3516a | 3652 | if (cant_eliminate) |
03acd8f8 BS |
3653 | { |
3654 | SET_HARD_REG_BIT (bad_spill_regs_global, regno); | |
3655 | regs_ever_live[regno] = 1; | |
3656 | } | |
9ff3516a | 3657 | |
32131a9c RK |
3658 | /* Spill every pseudo reg that was allocated to this reg |
3659 | or to something that overlaps this reg. */ | |
3660 | ||
3661 | for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++) | |
3662 | if (reg_renumber[i] >= 0 | |
3663 | && reg_renumber[i] <= regno | |
a8fdc208 | 3664 | && (reg_renumber[i] |
32131a9c RK |
3665 | + HARD_REGNO_NREGS (reg_renumber[i], |
3666 | PSEUDO_REGNO_MODE (i)) | |
3667 | > regno)) | |
03acd8f8 BS |
3668 | SET_REGNO_REG_SET (spilled_pseudos, i); |
3669 | } | |
32131a9c | 3670 | |
03acd8f8 BS |
3671 | /* I'm getting weird preprocessor errors if I use IOR_HARD_REG_SET |
3672 | from within EXECUTE_IF_SET_IN_REG_SET. Hence this awkwardness. */ | |
3673 | static void | |
3674 | ior_hard_reg_set (set1, set2) | |
3675 | HARD_REG_SET *set1, *set2; | |
3676 | { | |
3677 | IOR_HARD_REG_SET (*set1, *set2); | |
3678 | } | |
3679 | ||
3680 | /* After find_reload_regs has been run for all insn that need reloads, | |
3681 | and/or spill_hard_regs was called, this function is used to actually | |
3682 | spill pseudo registers and try to reallocate them. It also sets up the | |
3683 | spill_regs array for use by choose_reload_regs. */ | |
a8fdc208 | 3684 | |
03acd8f8 BS |
3685 | static int |
3686 | finish_spills (global, dumpfile) | |
3687 | int global; | |
3688 | FILE *dumpfile; | |
3689 | { | |
3690 | struct insn_chain *chain; | |
3691 | int something_changed = 0; | |
3692 | int i; | |
3693 | ||
3694 | /* Build the spill_regs array for the function. */ | |
3695 | /* If there are some registers still to eliminate and one of the spill regs | |
3696 | wasn't ever used before, additional stack space may have to be | |
3697 | allocated to store this register. Thus, we may have changed the offset | |
3698 | between the stack and frame pointers, so mark that something has changed. | |
32131a9c | 3699 | |
03acd8f8 BS |
3700 | One might think that we need only set VAL to 1 if this is a call-used |
3701 | register. However, the set of registers that must be saved by the | |
3702 | prologue is not identical to the call-used set. For example, the | |
3703 | register used by the call insn for the return PC is a call-used register, | |
3704 | but must be saved by the prologue. */ | |
3705 | ||
3706 | n_spills = 0; | |
3707 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
3708 | if (TEST_HARD_REG_BIT (used_spill_regs, i)) | |
3709 | { | |
3710 | spill_reg_order[i] = n_spills; | |
3711 | spill_regs[n_spills++] = i; | |
3712 | if (num_eliminable && ! regs_ever_live[i]) | |
3713 | something_changed = 1; | |
3714 | regs_ever_live[i] = 1; | |
3715 | } | |
3716 | else | |
3717 | spill_reg_order[i] = -1; | |
3718 | ||
3719 | for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++) | |
3720 | if (REGNO_REG_SET_P (spilled_pseudos, i)) | |
3721 | { | |
3722 | /* Record the current hard register the pseudo is allocated to in | |
3723 | pseudo_previous_regs so we avoid reallocating it to the same | |
3724 | hard reg in a later pass. */ | |
3725 | if (reg_renumber[i] < 0) | |
3726 | abort (); | |
3727 | SET_HARD_REG_BIT (pseudo_previous_regs[i], reg_renumber[i]); | |
32131a9c RK |
3728 | /* Mark it as no longer having a hard register home. */ |
3729 | reg_renumber[i] = -1; | |
3730 | /* We will need to scan everything again. */ | |
3731 | something_changed = 1; | |
03acd8f8 | 3732 | } |
7609e720 | 3733 | |
03acd8f8 BS |
3734 | /* Retry global register allocation if possible. */ |
3735 | if (global) | |
3736 | { | |
3737 | bzero ((char *) pseudo_forbidden_regs, max_regno * sizeof (HARD_REG_SET)); | |
3738 | /* For every insn that needs reloads, set the registers used as spill | |
3739 | regs in pseudo_forbidden_regs for every pseudo live across the | |
3740 | insn. */ | |
3741 | for (chain = insns_need_reload; chain; chain = chain->next_need_reload) | |
3742 | { | |
3743 | EXECUTE_IF_SET_IN_REG_SET | |
3744 | (chain->live_before, FIRST_PSEUDO_REGISTER, i, | |
3745 | { | |
3746 | ior_hard_reg_set (pseudo_forbidden_regs + i, | |
3747 | &chain->used_spill_regs); | |
3748 | }); | |
3749 | EXECUTE_IF_SET_IN_REG_SET | |
3750 | (chain->live_after, FIRST_PSEUDO_REGISTER, i, | |
3751 | { | |
3752 | ior_hard_reg_set (pseudo_forbidden_regs + i, | |
3753 | &chain->used_spill_regs); | |
3754 | }); | |
3755 | } | |
7609e720 | 3756 | |
03acd8f8 BS |
3757 | /* Retry allocating the spilled pseudos. For each reg, merge the |
3758 | various reg sets that indicate which hard regs can't be used, | |
3759 | and call retry_global_alloc. | |
3760 | We change spill_pseudos here to only contain pseudos that did not | |
3761 | get a new hard register. */ | |
3762 | for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++) | |
3763 | if (reg_old_renumber[i] != reg_renumber[i]) | |
32131a9c | 3764 | { |
03acd8f8 BS |
3765 | HARD_REG_SET forbidden; |
3766 | COPY_HARD_REG_SET (forbidden, bad_spill_regs_global); | |
3767 | IOR_HARD_REG_SET (forbidden, pseudo_forbidden_regs[i]); | |
3768 | IOR_HARD_REG_SET (forbidden, pseudo_previous_regs[i]); | |
3769 | retry_global_alloc (i, forbidden); | |
3770 | if (reg_renumber[i] >= 0) | |
3771 | CLEAR_REGNO_REG_SET (spilled_pseudos, i); | |
32131a9c | 3772 | } |
03acd8f8 | 3773 | } |
7609e720 | 3774 | |
03acd8f8 BS |
3775 | /* Fix up the register information in the insn chain. |
3776 | This involves deleting those of the spilled pseudos which did not get | |
3777 | a new hard register home from the live_{before,after} sets. */ | |
7609e720 BS |
3778 | for (chain = reload_insn_chain; chain; chain = chain->next) |
3779 | { | |
03acd8f8 BS |
3780 | HARD_REG_SET used_by_pseudos; |
3781 | HARD_REG_SET used_by_pseudos2; | |
3782 | ||
7609e720 BS |
3783 | AND_COMPL_REG_SET (chain->live_before, spilled_pseudos); |
3784 | AND_COMPL_REG_SET (chain->live_after, spilled_pseudos); | |
03acd8f8 BS |
3785 | |
3786 | /* Mark any unallocated hard regs as available for spills. That | |
3787 | makes inheritance work somewhat better. */ | |
3788 | if (chain->need_reload) | |
3789 | { | |
3790 | REG_SET_TO_HARD_REG_SET (used_by_pseudos, chain->live_before); | |
3791 | REG_SET_TO_HARD_REG_SET (used_by_pseudos2, chain->live_after); | |
3792 | IOR_HARD_REG_SET (used_by_pseudos, used_by_pseudos2); | |
3793 | ||
3794 | /* Save the old value for the sanity test below. */ | |
3795 | COPY_HARD_REG_SET (used_by_pseudos2, chain->used_spill_regs); | |
3796 | ||
3797 | compute_use_by_pseudos (&used_by_pseudos, chain->live_before); | |
3798 | compute_use_by_pseudos (&used_by_pseudos, chain->live_after); | |
3799 | COMPL_HARD_REG_SET (chain->used_spill_regs, used_by_pseudos); | |
3800 | AND_HARD_REG_SET (chain->used_spill_regs, used_spill_regs); | |
3801 | ||
3802 | /* Make sure we only enlarge the set. */ | |
3803 | GO_IF_HARD_REG_SUBSET (used_by_pseudos2, chain->used_spill_regs, ok); | |
3804 | abort (); | |
3805 | ok:; | |
3806 | } | |
7609e720 | 3807 | } |
03acd8f8 BS |
3808 | |
3809 | /* Let alter_reg modify the reg rtx's for the modified pseudos. */ | |
3810 | for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++) | |
3811 | { | |
3812 | int regno = reg_renumber[i]; | |
3813 | if (reg_old_renumber[i] == regno) | |
3814 | continue; | |
3815 | ||
3816 | alter_reg (i, reg_old_renumber[i]); | |
3817 | reg_old_renumber[i] = regno; | |
3818 | if (dumpfile) | |
3819 | { | |
3820 | if (regno == -1) | |
3821 | fprintf (dumpfile, " Register %d now on stack.\n\n", i); | |
3822 | else | |
3823 | fprintf (dumpfile, " Register %d now in %d.\n\n", | |
3824 | i, reg_renumber[i]); | |
3825 | } | |
3826 | } | |
3827 | ||
3828 | return something_changed; | |
7609e720 | 3829 | } |
32131a9c | 3830 | \f |
56f58d3a RK |
3831 | /* Find all paradoxical subregs within X and update reg_max_ref_width. |
3832 | Also mark any hard registers used to store user variables as | |
3833 | forbidden from being used for spill registers. */ | |
32131a9c RK |
3834 | |
3835 | static void | |
3836 | scan_paradoxical_subregs (x) | |
3837 | register rtx x; | |
3838 | { | |
3839 | register int i; | |
3840 | register char *fmt; | |
3841 | register enum rtx_code code = GET_CODE (x); | |
3842 | ||
3843 | switch (code) | |
3844 | { | |
56f58d3a | 3845 | case REG: |
03acd8f8 | 3846 | #if 0 |
e9a25f70 | 3847 | if (SMALL_REGISTER_CLASSES && REGNO (x) < FIRST_PSEUDO_REGISTER |
f95182a4 | 3848 | && REG_USERVAR_P (x)) |
03acd8f8 BS |
3849 | SET_HARD_REG_BIT (bad_spill_regs_global, REGNO (x)); |
3850 | #endif | |
56f58d3a RK |
3851 | return; |
3852 | ||
32131a9c RK |
3853 | case CONST_INT: |
3854 | case CONST: | |
3855 | case SYMBOL_REF: | |
3856 | case LABEL_REF: | |
3857 | case CONST_DOUBLE: | |
3858 | case CC0: | |
3859 | case PC: | |
32131a9c RK |
3860 | case USE: |
3861 | case CLOBBER: | |
3862 | return; | |
3863 | ||
3864 | case SUBREG: | |
3865 | if (GET_CODE (SUBREG_REG (x)) == REG | |
3866 | && GET_MODE_SIZE (GET_MODE (x)) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) | |
3867 | reg_max_ref_width[REGNO (SUBREG_REG (x))] | |
3868 | = GET_MODE_SIZE (GET_MODE (x)); | |
3869 | return; | |
e9a25f70 JL |
3870 | |
3871 | default: | |
3872 | break; | |
32131a9c RK |
3873 | } |
3874 | ||
3875 | fmt = GET_RTX_FORMAT (code); | |
3876 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
3877 | { | |
3878 | if (fmt[i] == 'e') | |
3879 | scan_paradoxical_subregs (XEXP (x, i)); | |
3880 | else if (fmt[i] == 'E') | |
3881 | { | |
3882 | register int j; | |
3883 | for (j = XVECLEN (x, i) - 1; j >=0; j--) | |
3884 | scan_paradoxical_subregs (XVECEXP (x, i, j)); | |
3885 | } | |
3886 | } | |
3887 | } | |
3888 | \f | |
32131a9c | 3889 | static int |
788a0818 | 3890 | hard_reg_use_compare (p1p, p2p) |
03acd8f8 BS |
3891 | const GENERIC_PTR p1p; |
3892 | const GENERIC_PTR p2p; | |
3893 | { | |
3894 | struct hard_reg_n_uses *p1 = (struct hard_reg_n_uses *)p1p; | |
3895 | struct hard_reg_n_uses *p2 = (struct hard_reg_n_uses *)p2p; | |
3896 | int bad1 = TEST_HARD_REG_BIT (bad_spill_regs, p1->regno); | |
3897 | int bad2 = TEST_HARD_REG_BIT (bad_spill_regs, p2->regno); | |
3898 | if (bad1 && bad2) | |
3899 | return p1->regno - p2->regno; | |
3900 | if (bad1) | |
3901 | return 1; | |
3902 | if (bad2) | |
3903 | return -1; | |
3904 | if (p1->uses > p2->uses) | |
3905 | return 1; | |
3906 | if (p1->uses < p2->uses) | |
3907 | return -1; | |
32131a9c RK |
3908 | /* If regs are equally good, sort by regno, |
3909 | so that the results of qsort leave nothing to chance. */ | |
3910 | return p1->regno - p2->regno; | |
3911 | } | |
3912 | ||
03acd8f8 BS |
3913 | /* Used for communication between order_regs_for_reload and count_pseudo. |
3914 | Used to avoid counting one pseudo twice. */ | |
3915 | static regset pseudos_counted; | |
3916 | ||
3917 | /* Update the costs in N_USES, considering that pseudo REG is live. */ | |
3918 | static void | |
3919 | count_pseudo (n_uses, reg) | |
3920 | struct hard_reg_n_uses *n_uses; | |
3921 | int reg; | |
3922 | { | |
3923 | int r = reg_renumber[reg]; | |
3924 | int nregs; | |
3925 | ||
3926 | if (REGNO_REG_SET_P (pseudos_counted, reg)) | |
3927 | return; | |
3928 | SET_REGNO_REG_SET (pseudos_counted, reg); | |
3929 | ||
3930 | if (r < 0) | |
3931 | abort (); | |
3932 | ||
3933 | nregs = HARD_REGNO_NREGS (r, PSEUDO_REGNO_MODE (reg)); | |
3934 | while (nregs-- > 0) | |
3935 | n_uses[r++].uses += REG_N_REFS (reg); | |
3936 | } | |
32131a9c RK |
3937 | /* Choose the order to consider regs for use as reload registers |
3938 | based on how much trouble would be caused by spilling one. | |
3939 | Store them in order of decreasing preference in potential_reload_regs. */ | |
3940 | ||
3941 | static void | |
03acd8f8 BS |
3942 | order_regs_for_reload (chain) |
3943 | struct insn_chain *chain; | |
32131a9c | 3944 | { |
03acd8f8 | 3945 | register int i; |
32131a9c | 3946 | register int o = 0; |
32131a9c RK |
3947 | struct hard_reg_n_uses hard_reg_n_uses[FIRST_PSEUDO_REGISTER]; |
3948 | ||
03acd8f8 | 3949 | pseudos_counted = ALLOCA_REG_SET (); |
32131a9c | 3950 | |
03acd8f8 | 3951 | COPY_HARD_REG_SET (bad_spill_regs, bad_spill_regs_global); |
32131a9c RK |
3952 | |
3953 | /* Count number of uses of each hard reg by pseudo regs allocated to it | |
3954 | and then order them by decreasing use. */ | |
3955 | ||
3956 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
3957 | { | |
03acd8f8 BS |
3958 | int j; |
3959 | ||
32131a9c | 3960 | hard_reg_n_uses[i].regno = i; |
03acd8f8 | 3961 | hard_reg_n_uses[i].uses = 0; |
32131a9c | 3962 | |
03acd8f8 BS |
3963 | /* Test the various reasons why we can't use a register for |
3964 | spilling in this insn. */ | |
3965 | if (fixed_regs[i] | |
3966 | || REGNO_REG_SET_P (chain->live_before, i) | |
3967 | || REGNO_REG_SET_P (chain->live_after, i)) | |
32131a9c | 3968 | { |
32131a9c | 3969 | SET_HARD_REG_BIT (bad_spill_regs, i); |
03acd8f8 | 3970 | continue; |
32131a9c | 3971 | } |
32131a9c | 3972 | |
03acd8f8 BS |
3973 | /* Now find out which pseudos are allocated to it, and update |
3974 | hard_reg_n_uses. */ | |
3975 | CLEAR_REG_SET (pseudos_counted); | |
3976 | ||
3977 | EXECUTE_IF_SET_IN_REG_SET | |
3978 | (chain->live_before, FIRST_PSEUDO_REGISTER, j, | |
3979 | { | |
3980 | count_pseudo (hard_reg_n_uses, j); | |
3981 | }); | |
3982 | EXECUTE_IF_SET_IN_REG_SET | |
3983 | (chain->live_after, FIRST_PSEUDO_REGISTER, j, | |
3984 | { | |
3985 | count_pseudo (hard_reg_n_uses, j); | |
3986 | }); | |
32131a9c | 3987 | } |
03acd8f8 BS |
3988 | |
3989 | FREE_REG_SET (pseudos_counted); | |
32131a9c RK |
3990 | |
3991 | /* Prefer registers not so far used, for use in temporary loading. | |
3992 | Among them, if REG_ALLOC_ORDER is defined, use that order. | |
3993 | Otherwise, prefer registers not preserved by calls. */ | |
3994 | ||
3995 | #ifdef REG_ALLOC_ORDER | |
3996 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
3997 | { | |
3998 | int regno = reg_alloc_order[i]; | |
3999 | ||
03acd8f8 BS |
4000 | if (hard_reg_n_uses[regno].uses == 0 |
4001 | && ! TEST_HARD_REG_BIT (bad_spill_regs, regno)) | |
32131a9c RK |
4002 | potential_reload_regs[o++] = regno; |
4003 | } | |
4004 | #else | |
4005 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
4006 | { | |
03acd8f8 BS |
4007 | if (hard_reg_n_uses[i].uses == 0 && call_used_regs[i] |
4008 | && ! TEST_HARD_REG_BIT (bad_spill_regs, i)) | |
32131a9c RK |
4009 | potential_reload_regs[o++] = i; |
4010 | } | |
4011 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
4012 | { | |
03acd8f8 BS |
4013 | if (hard_reg_n_uses[i].uses == 0 && ! call_used_regs[i] |
4014 | && ! TEST_HARD_REG_BIT (bad_spill_regs, i)) | |
32131a9c RK |
4015 | potential_reload_regs[o++] = i; |
4016 | } | |
4017 | #endif | |
4018 | ||
4019 | qsort (hard_reg_n_uses, FIRST_PSEUDO_REGISTER, | |
4020 | sizeof hard_reg_n_uses[0], hard_reg_use_compare); | |
4021 | ||
4022 | /* Now add the regs that are already used, | |
4023 | preferring those used less often. The fixed and otherwise forbidden | |
4024 | registers will be at the end of this list. */ | |
4025 | ||
4026 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
03acd8f8 BS |
4027 | if (hard_reg_n_uses[i].uses != 0 |
4028 | && ! TEST_HARD_REG_BIT (bad_spill_regs, hard_reg_n_uses[i].regno)) | |
4029 | potential_reload_regs[o++] = hard_reg_n_uses[i].regno; | |
4030 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
4031 | if (TEST_HARD_REG_BIT (bad_spill_regs, hard_reg_n_uses[i].regno)) | |
32131a9c RK |
4032 | potential_reload_regs[o++] = hard_reg_n_uses[i].regno; |
4033 | } | |
4034 | \f | |
4035 | /* Reload pseudo-registers into hard regs around each insn as needed. | |
4036 | Additional register load insns are output before the insn that needs it | |
4037 | and perhaps store insns after insns that modify the reloaded pseudo reg. | |
4038 | ||
4039 | reg_last_reload_reg and reg_reloaded_contents keep track of | |
d08ea79f | 4040 | which registers are already available in reload registers. |
32131a9c RK |
4041 | We update these for the reloads that we perform, |
4042 | as the insns are scanned. */ | |
4043 | ||
4044 | static void | |
7609e720 | 4045 | reload_as_needed (live_known) |
32131a9c RK |
4046 | int live_known; |
4047 | { | |
7609e720 | 4048 | struct insn_chain *chain; |
32131a9c | 4049 | register int i; |
32131a9c | 4050 | rtx x; |
32131a9c | 4051 | |
4c9a05bc RK |
4052 | bzero ((char *) spill_reg_rtx, sizeof spill_reg_rtx); |
4053 | bzero ((char *) spill_reg_store, sizeof spill_reg_store); | |
32131a9c | 4054 | reg_last_reload_reg = (rtx *) alloca (max_regno * sizeof (rtx)); |
4c9a05bc | 4055 | bzero ((char *) reg_last_reload_reg, max_regno * sizeof (rtx)); |
32131a9c | 4056 | reg_has_output_reload = (char *) alloca (max_regno); |
e6e52be0 | 4057 | CLEAR_HARD_REG_SET (reg_reloaded_valid); |
32131a9c RK |
4058 | |
4059 | /* Reset all offsets on eliminable registers to their initial values. */ | |
4060 | #ifdef ELIMINABLE_REGS | |
e51712db | 4061 | for (i = 0; i < (int) NUM_ELIMINABLE_REGS; i++) |
32131a9c RK |
4062 | { |
4063 | INITIAL_ELIMINATION_OFFSET (reg_eliminate[i].from, reg_eliminate[i].to, | |
510dd77e | 4064 | reg_eliminate[i].initial_offset); |
32131a9c RK |
4065 | reg_eliminate[i].previous_offset |
4066 | = reg_eliminate[i].offset = reg_eliminate[i].initial_offset; | |
4067 | } | |
4068 | #else | |
4069 | INITIAL_FRAME_POINTER_OFFSET (reg_eliminate[0].initial_offset); | |
4070 | reg_eliminate[0].previous_offset | |
4071 | = reg_eliminate[0].offset = reg_eliminate[0].initial_offset; | |
4072 | #endif | |
4073 | ||
4074 | num_not_at_initial_offset = 0; | |
4075 | ||
7609e720 | 4076 | for (chain = reload_insn_chain; chain; chain = chain->next) |
32131a9c | 4077 | { |
03acd8f8 | 4078 | rtx prev; |
7609e720 BS |
4079 | rtx insn = chain->insn; |
4080 | rtx old_next = NEXT_INSN (insn); | |
32131a9c RK |
4081 | |
4082 | /* If we pass a label, copy the offsets from the label information | |
4083 | into the current offsets of each elimination. */ | |
4084 | if (GET_CODE (insn) == CODE_LABEL) | |
2a4b5f3b RK |
4085 | { |
4086 | num_not_at_initial_offset = 0; | |
e51712db | 4087 | for (i = 0; i < (int) NUM_ELIMINABLE_REGS; i++) |
2a4b5f3b RK |
4088 | { |
4089 | reg_eliminate[i].offset = reg_eliminate[i].previous_offset | |
4090 | = offsets_at[CODE_LABEL_NUMBER (insn)][i]; | |
1d0d98f3 RK |
4091 | if (reg_eliminate[i].can_eliminate |
4092 | && (reg_eliminate[i].offset | |
4093 | != reg_eliminate[i].initial_offset)) | |
2a4b5f3b RK |
4094 | num_not_at_initial_offset++; |
4095 | } | |
4096 | } | |
32131a9c RK |
4097 | |
4098 | else if (GET_RTX_CLASS (GET_CODE (insn)) == 'i') | |
4099 | { | |
0639444f | 4100 | rtx oldpat = PATTERN (insn); |
32131a9c | 4101 | |
2758481d RS |
4102 | /* If this is a USE and CLOBBER of a MEM, ensure that any |
4103 | references to eliminable registers have been removed. */ | |
4104 | ||
4105 | if ((GET_CODE (PATTERN (insn)) == USE | |
4106 | || GET_CODE (PATTERN (insn)) == CLOBBER) | |
4107 | && GET_CODE (XEXP (PATTERN (insn), 0)) == MEM) | |
4108 | XEXP (XEXP (PATTERN (insn), 0), 0) | |
4109 | = eliminate_regs (XEXP (XEXP (PATTERN (insn), 0), 0), | |
29ae5012 | 4110 | GET_MODE (XEXP (PATTERN (insn), 0)), |
1914f5da | 4111 | NULL_RTX); |
2758481d | 4112 | |
32131a9c RK |
4113 | /* If we need to do register elimination processing, do so. |
4114 | This might delete the insn, in which case we are done. */ | |
7609e720 | 4115 | if (num_eliminable && chain->need_elim) |
32131a9c RK |
4116 | { |
4117 | eliminate_regs_in_insn (insn, 1); | |
4118 | if (GET_CODE (insn) == NOTE) | |
cb2afeb3 R |
4119 | { |
4120 | update_eliminable_offsets (); | |
4121 | continue; | |
4122 | } | |
32131a9c RK |
4123 | } |
4124 | ||
7609e720 BS |
4125 | /* If need_elim is nonzero but need_reload is zero, one might think |
4126 | that we could simply set n_reloads to 0. However, find_reloads | |
4127 | could have done some manipulation of the insn (such as swapping | |
4128 | commutative operands), and these manipulations are lost during | |
4129 | the first pass for every insn that needs register elimination. | |
4130 | So the actions of find_reloads must be redone here. */ | |
4131 | ||
03acd8f8 BS |
4132 | if (! chain->need_elim && ! chain->need_reload |
4133 | && ! chain->need_operand_change) | |
32131a9c RK |
4134 | n_reloads = 0; |
4135 | /* First find the pseudo regs that must be reloaded for this insn. | |
4136 | This info is returned in the tables reload_... (see reload.h). | |
4137 | Also modify the body of INSN by substituting RELOAD | |
4138 | rtx's for those pseudo regs. */ | |
4139 | else | |
4140 | { | |
4141 | bzero (reg_has_output_reload, max_regno); | |
4142 | CLEAR_HARD_REG_SET (reg_is_output_reload); | |
4143 | ||
4144 | find_reloads (insn, 1, spill_indirect_levels, live_known, | |
4145 | spill_reg_order); | |
4146 | } | |
4147 | ||
dd6acd1b | 4148 | if (num_eliminable && chain->need_elim) |
cb2afeb3 R |
4149 | update_eliminable_offsets (); |
4150 | ||
32131a9c RK |
4151 | if (n_reloads > 0) |
4152 | { | |
cb2afeb3 | 4153 | rtx next = NEXT_INSN (insn); |
3c3eeea6 | 4154 | rtx p; |
32131a9c | 4155 | |
cb2afeb3 R |
4156 | prev = PREV_INSN (insn); |
4157 | ||
32131a9c RK |
4158 | /* Now compute which reload regs to reload them into. Perhaps |
4159 | reusing reload regs from previous insns, or else output | |
4160 | load insns to reload them. Maybe output store insns too. | |
4161 | Record the choices of reload reg in reload_reg_rtx. */ | |
03acd8f8 | 4162 | choose_reload_regs (chain); |
32131a9c | 4163 | |
546b63fb RK |
4164 | /* Merge any reloads that we didn't combine for fear of |
4165 | increasing the number of spill registers needed but now | |
4166 | discover can be safely merged. */ | |
f95182a4 ILT |
4167 | if (SMALL_REGISTER_CLASSES) |
4168 | merge_assigned_reloads (insn); | |
546b63fb | 4169 | |
32131a9c RK |
4170 | /* Generate the insns to reload operands into or out of |
4171 | their reload regs. */ | |
7609e720 | 4172 | emit_reload_insns (chain); |
32131a9c RK |
4173 | |
4174 | /* Substitute the chosen reload regs from reload_reg_rtx | |
4175 | into the insn's body (or perhaps into the bodies of other | |
4176 | load and store insn that we just made for reloading | |
4177 | and that we moved the structure into). */ | |
4178 | subst_reloads (); | |
3c3eeea6 RK |
4179 | |
4180 | /* If this was an ASM, make sure that all the reload insns | |
4181 | we have generated are valid. If not, give an error | |
4182 | and delete them. */ | |
4183 | ||
4184 | if (asm_noperands (PATTERN (insn)) >= 0) | |
4185 | for (p = NEXT_INSN (prev); p != next; p = NEXT_INSN (p)) | |
4186 | if (p != insn && GET_RTX_CLASS (GET_CODE (p)) == 'i' | |
4187 | && (recog_memoized (p) < 0 | |
4188 | || (insn_extract (p), | |
4189 | ! constrain_operands (INSN_CODE (p), 1)))) | |
4190 | { | |
4191 | error_for_asm (insn, | |
4192 | "`asm' operand requires impossible reload"); | |
4193 | PUT_CODE (p, NOTE); | |
4194 | NOTE_SOURCE_FILE (p) = 0; | |
4195 | NOTE_LINE_NUMBER (p) = NOTE_INSN_DELETED; | |
4196 | } | |
32131a9c RK |
4197 | } |
4198 | /* Any previously reloaded spilled pseudo reg, stored in this insn, | |
4199 | is no longer validly lying around to save a future reload. | |
4200 | Note that this does not detect pseudos that were reloaded | |
4201 | for this insn in order to be stored in | |
4202 | (obeying register constraints). That is correct; such reload | |
4203 | registers ARE still valid. */ | |
0639444f | 4204 | note_stores (oldpat, forget_old_reloads_1); |
32131a9c RK |
4205 | |
4206 | /* There may have been CLOBBER insns placed after INSN. So scan | |
4207 | between INSN and NEXT and use them to forget old reloads. */ | |
7609e720 | 4208 | for (x = NEXT_INSN (insn); x != old_next; x = NEXT_INSN (x)) |
32131a9c RK |
4209 | if (GET_CODE (x) == INSN && GET_CODE (PATTERN (x)) == CLOBBER) |
4210 | note_stores (PATTERN (x), forget_old_reloads_1); | |
4211 | ||
4212 | #ifdef AUTO_INC_DEC | |
cb2afeb3 R |
4213 | /* Likewise for regs altered by auto-increment in this insn. |
4214 | REG_INC notes have been changed by reloading: | |
4215 | find_reloads_address_1 records substitutions for them, | |
4216 | which have been performed by subst_reloads above. */ | |
4217 | for (i = n_reloads - 1; i >= 0; i--) | |
4218 | { | |
4219 | rtx in_reg = reload_in_reg[i]; | |
4220 | if (in_reg) | |
4221 | { | |
4222 | enum rtx_code code = GET_CODE (in_reg); | |
4223 | /* PRE_INC / PRE_DEC will have the reload register ending up | |
4224 | with the same value as the stack slot, but that doesn't | |
4225 | hold true for POST_INC / POST_DEC. Either we have to | |
4226 | convert the memory access to a true POST_INC / POST_DEC, | |
4227 | or we can't use the reload register for inheritance. */ | |
4228 | if ((code == POST_INC || code == POST_DEC) | |
4229 | && TEST_HARD_REG_BIT (reg_reloaded_valid, | |
04bbb0c5 JW |
4230 | REGNO (reload_reg_rtx[i])) |
4231 | /* Make sure it is the inc/dec pseudo, and not | |
4232 | some other (e.g. output operand) pseudo. */ | |
4233 | && (reg_reloaded_contents[REGNO (reload_reg_rtx[i])] | |
4234 | == REGNO (XEXP (in_reg, 0)))) | |
4235 | ||
cb2afeb3 R |
4236 | { |
4237 | rtx reload_reg = reload_reg_rtx[i]; | |
4238 | enum machine_mode mode = GET_MODE (reload_reg); | |
4239 | int n = 0; | |
4240 | rtx p; | |
4241 | ||
4242 | for (p = PREV_INSN (old_next); p != prev; p = PREV_INSN (p)) | |
4243 | { | |
4244 | /* We really want to ignore REG_INC notes here, so | |
4245 | use PATTERN (p) as argument to reg_set_p . */ | |
4246 | if (reg_set_p (reload_reg, PATTERN (p))) | |
4247 | break; | |
4248 | n = count_occurrences (PATTERN (p), reload_reg); | |
4249 | if (! n) | |
4250 | continue; | |
4251 | if (n == 1) | |
4252 | n = validate_replace_rtx (reload_reg, | |
4253 | gen_rtx (code, mode, | |
4254 | reload_reg), p); | |
4255 | break; | |
4256 | } | |
4257 | if (n == 1) | |
4258 | REG_NOTES (p) = gen_rtx_EXPR_LIST (REG_INC, reload_reg, | |
4259 | REG_NOTES (p)); | |
4260 | else | |
4261 | forget_old_reloads_1 (XEXP (in_reg, 0), NULL_RTX); | |
4262 | } | |
4263 | } | |
4264 | } | |
4265 | #if 0 /* ??? Is this code obsolete now? Need to check carefully. */ | |
32131a9c RK |
4266 | /* Likewise for regs altered by auto-increment in this insn. |
4267 | But note that the reg-notes are not changed by reloading: | |
4268 | they still contain the pseudo-regs, not the spill regs. */ | |
4269 | for (x = REG_NOTES (insn); x; x = XEXP (x, 1)) | |
4270 | if (REG_NOTE_KIND (x) == REG_INC) | |
4271 | { | |
4272 | /* See if this pseudo reg was reloaded in this insn. | |
4273 | If so, its last-reload info is still valid | |
4274 | because it is based on this insn's reload. */ | |
4275 | for (i = 0; i < n_reloads; i++) | |
4276 | if (reload_out[i] == XEXP (x, 0)) | |
4277 | break; | |
4278 | ||
08fb99fa | 4279 | if (i == n_reloads) |
9a881562 | 4280 | forget_old_reloads_1 (XEXP (x, 0), NULL_RTX); |
32131a9c | 4281 | } |
cb2afeb3 | 4282 | #endif |
32131a9c RK |
4283 | #endif |
4284 | } | |
4285 | /* A reload reg's contents are unknown after a label. */ | |
4286 | if (GET_CODE (insn) == CODE_LABEL) | |
e6e52be0 | 4287 | CLEAR_HARD_REG_SET (reg_reloaded_valid); |
32131a9c RK |
4288 | |
4289 | /* Don't assume a reload reg is still good after a call insn | |
4290 | if it is a call-used reg. */ | |
546b63fb | 4291 | else if (GET_CODE (insn) == CALL_INSN) |
e6e52be0 | 4292 | AND_COMPL_HARD_REG_SET(reg_reloaded_valid, call_used_reg_set); |
32131a9c RK |
4293 | |
4294 | /* In case registers overlap, allow certain insns to invalidate | |
4295 | particular hard registers. */ | |
4296 | ||
4297 | #ifdef INSN_CLOBBERS_REGNO_P | |
e6e52be0 R |
4298 | for (i = 0 ; i < FIRST_PSEUDO_REGISTER; i++) |
4299 | if (TEST_HARD_REG_BIT (reg_reloaded_valid, i) | |
4300 | && INSN_CLOBBERS_REGNO_P (insn, i)) | |
4301 | CLEAR_HARD_REG_BIT (reg_reloaded_valid, i); | |
32131a9c RK |
4302 | #endif |
4303 | ||
32131a9c RK |
4304 | #ifdef USE_C_ALLOCA |
4305 | alloca (0); | |
4306 | #endif | |
4307 | } | |
4308 | } | |
4309 | ||
4310 | /* Discard all record of any value reloaded from X, | |
4311 | or reloaded in X from someplace else; | |
4312 | unless X is an output reload reg of the current insn. | |
4313 | ||
4314 | X may be a hard reg (the reload reg) | |
4315 | or it may be a pseudo reg that was reloaded from. */ | |
4316 | ||
4317 | static void | |
9a881562 | 4318 | forget_old_reloads_1 (x, ignored) |
32131a9c | 4319 | rtx x; |
487a6e06 | 4320 | rtx ignored ATTRIBUTE_UNUSED; |
32131a9c RK |
4321 | { |
4322 | register int regno; | |
4323 | int nr; | |
0a2e51a9 RS |
4324 | int offset = 0; |
4325 | ||
4326 | /* note_stores does give us subregs of hard regs. */ | |
4327 | while (GET_CODE (x) == SUBREG) | |
4328 | { | |
4329 | offset += SUBREG_WORD (x); | |
4330 | x = SUBREG_REG (x); | |
4331 | } | |
32131a9c RK |
4332 | |
4333 | if (GET_CODE (x) != REG) | |
4334 | return; | |
4335 | ||
0a2e51a9 | 4336 | regno = REGNO (x) + offset; |
32131a9c RK |
4337 | |
4338 | if (regno >= FIRST_PSEUDO_REGISTER) | |
4339 | nr = 1; | |
4340 | else | |
4341 | { | |
4342 | int i; | |
4343 | nr = HARD_REGNO_NREGS (regno, GET_MODE (x)); | |
4344 | /* Storing into a spilled-reg invalidates its contents. | |
4345 | This can happen if a block-local pseudo is allocated to that reg | |
4346 | and it wasn't spilled because this block's total need is 0. | |
4347 | Then some insn might have an optional reload and use this reg. */ | |
4348 | for (i = 0; i < nr; i++) | |
e6e52be0 R |
4349 | /* But don't do this if the reg actually serves as an output |
4350 | reload reg in the current instruction. */ | |
4351 | if (n_reloads == 0 | |
4352 | || ! TEST_HARD_REG_BIT (reg_is_output_reload, regno + i)) | |
4353 | CLEAR_HARD_REG_BIT (reg_reloaded_valid, regno + i); | |
32131a9c RK |
4354 | } |
4355 | ||
4356 | /* Since value of X has changed, | |
4357 | forget any value previously copied from it. */ | |
4358 | ||
4359 | while (nr-- > 0) | |
4360 | /* But don't forget a copy if this is the output reload | |
4361 | that establishes the copy's validity. */ | |
4362 | if (n_reloads == 0 || reg_has_output_reload[regno + nr] == 0) | |
4363 | reg_last_reload_reg[regno + nr] = 0; | |
4364 | } | |
4365 | \f | |
4366 | /* For each reload, the mode of the reload register. */ | |
4367 | static enum machine_mode reload_mode[MAX_RELOADS]; | |
4368 | ||
4369 | /* For each reload, the largest number of registers it will require. */ | |
4370 | static int reload_nregs[MAX_RELOADS]; | |
4371 | ||
4372 | /* Comparison function for qsort to decide which of two reloads | |
4373 | should be handled first. *P1 and *P2 are the reload numbers. */ | |
4374 | ||
4375 | static int | |
788a0818 RK |
4376 | reload_reg_class_lower (r1p, r2p) |
4377 | const GENERIC_PTR r1p; | |
4378 | const GENERIC_PTR r2p; | |
32131a9c | 4379 | { |
788a0818 | 4380 | register int r1 = *(short *)r1p, r2 = *(short *)r2p; |
32131a9c | 4381 | register int t; |
a8fdc208 | 4382 | |
32131a9c RK |
4383 | /* Consider required reloads before optional ones. */ |
4384 | t = reload_optional[r1] - reload_optional[r2]; | |
4385 | if (t != 0) | |
4386 | return t; | |
4387 | ||
4388 | /* Count all solitary classes before non-solitary ones. */ | |
4389 | t = ((reg_class_size[(int) reload_reg_class[r2]] == 1) | |
4390 | - (reg_class_size[(int) reload_reg_class[r1]] == 1)); | |
4391 | if (t != 0) | |
4392 | return t; | |
4393 | ||
4394 | /* Aside from solitaires, consider all multi-reg groups first. */ | |
4395 | t = reload_nregs[r2] - reload_nregs[r1]; | |
4396 | if (t != 0) | |
4397 | return t; | |
4398 | ||
4399 | /* Consider reloads in order of increasing reg-class number. */ | |
4400 | t = (int) reload_reg_class[r1] - (int) reload_reg_class[r2]; | |
4401 | if (t != 0) | |
4402 | return t; | |
4403 | ||
4404 | /* If reloads are equally urgent, sort by reload number, | |
4405 | so that the results of qsort leave nothing to chance. */ | |
4406 | return r1 - r2; | |
4407 | } | |
4408 | \f | |
4409 | /* The following HARD_REG_SETs indicate when each hard register is | |
4410 | used for a reload of various parts of the current insn. */ | |
4411 | ||
4412 | /* If reg is in use as a reload reg for a RELOAD_OTHER reload. */ | |
4413 | static HARD_REG_SET reload_reg_used; | |
546b63fb RK |
4414 | /* If reg is in use for a RELOAD_FOR_INPUT_ADDRESS reload for operand I. */ |
4415 | static HARD_REG_SET reload_reg_used_in_input_addr[MAX_RECOG_OPERANDS]; | |
47c8cf91 ILT |
4416 | /* If reg is in use for a RELOAD_FOR_INPADDR_ADDRESS reload for operand I. */ |
4417 | static HARD_REG_SET reload_reg_used_in_inpaddr_addr[MAX_RECOG_OPERANDS]; | |
546b63fb RK |
4418 | /* If reg is in use for a RELOAD_FOR_OUTPUT_ADDRESS reload for operand I. */ |
4419 | static HARD_REG_SET reload_reg_used_in_output_addr[MAX_RECOG_OPERANDS]; | |
47c8cf91 ILT |
4420 | /* If reg is in use for a RELOAD_FOR_OUTADDR_ADDRESS reload for operand I. */ |
4421 | static HARD_REG_SET reload_reg_used_in_outaddr_addr[MAX_RECOG_OPERANDS]; | |
546b63fb RK |
4422 | /* If reg is in use for a RELOAD_FOR_INPUT reload for operand I. */ |
4423 | static HARD_REG_SET reload_reg_used_in_input[MAX_RECOG_OPERANDS]; | |
4424 | /* If reg is in use for a RELOAD_FOR_OUTPUT reload for operand I. */ | |
4425 | static HARD_REG_SET reload_reg_used_in_output[MAX_RECOG_OPERANDS]; | |
32131a9c RK |
4426 | /* If reg is in use for a RELOAD_FOR_OPERAND_ADDRESS reload. */ |
4427 | static HARD_REG_SET reload_reg_used_in_op_addr; | |
893bc853 RK |
4428 | /* If reg is in use for a RELOAD_FOR_OPADDR_ADDR reload. */ |
4429 | static HARD_REG_SET reload_reg_used_in_op_addr_reload; | |
546b63fb RK |
4430 | /* If reg is in use for a RELOAD_FOR_INSN reload. */ |
4431 | static HARD_REG_SET reload_reg_used_in_insn; | |
4432 | /* If reg is in use for a RELOAD_FOR_OTHER_ADDRESS reload. */ | |
4433 | static HARD_REG_SET reload_reg_used_in_other_addr; | |
32131a9c RK |
4434 | |
4435 | /* If reg is in use as a reload reg for any sort of reload. */ | |
4436 | static HARD_REG_SET reload_reg_used_at_all; | |
4437 | ||
be7ae2a4 RK |
4438 | /* If reg is use as an inherited reload. We just mark the first register |
4439 | in the group. */ | |
4440 | static HARD_REG_SET reload_reg_used_for_inherit; | |
4441 | ||
297927a8 BS |
4442 | /* Records which hard regs are allocated to a pseudo during any point of the |
4443 | current insn. */ | |
4444 | static HARD_REG_SET reg_used_by_pseudo; | |
4445 | ||
546b63fb RK |
4446 | /* Mark reg REGNO as in use for a reload of the sort spec'd by OPNUM and |
4447 | TYPE. MODE is used to indicate how many consecutive regs are | |
4448 | actually used. */ | |
32131a9c RK |
4449 | |
4450 | static void | |
546b63fb | 4451 | mark_reload_reg_in_use (regno, opnum, type, mode) |
32131a9c | 4452 | int regno; |
546b63fb RK |
4453 | int opnum; |
4454 | enum reload_type type; | |
32131a9c RK |
4455 | enum machine_mode mode; |
4456 | { | |
4457 | int nregs = HARD_REGNO_NREGS (regno, mode); | |
4458 | int i; | |
4459 | ||
4460 | for (i = regno; i < nregs + regno; i++) | |
4461 | { | |
546b63fb | 4462 | switch (type) |
32131a9c RK |
4463 | { |
4464 | case RELOAD_OTHER: | |
4465 | SET_HARD_REG_BIT (reload_reg_used, i); | |
4466 | break; | |
4467 | ||
546b63fb RK |
4468 | case RELOAD_FOR_INPUT_ADDRESS: |
4469 | SET_HARD_REG_BIT (reload_reg_used_in_input_addr[opnum], i); | |
32131a9c RK |
4470 | break; |
4471 | ||
47c8cf91 ILT |
4472 | case RELOAD_FOR_INPADDR_ADDRESS: |
4473 | SET_HARD_REG_BIT (reload_reg_used_in_inpaddr_addr[opnum], i); | |
4474 | break; | |
4475 | ||
546b63fb RK |
4476 | case RELOAD_FOR_OUTPUT_ADDRESS: |
4477 | SET_HARD_REG_BIT (reload_reg_used_in_output_addr[opnum], i); | |
32131a9c RK |
4478 | break; |
4479 | ||
47c8cf91 ILT |
4480 | case RELOAD_FOR_OUTADDR_ADDRESS: |
4481 | SET_HARD_REG_BIT (reload_reg_used_in_outaddr_addr[opnum], i); | |
4482 | break; | |
4483 | ||
32131a9c RK |
4484 | case RELOAD_FOR_OPERAND_ADDRESS: |
4485 | SET_HARD_REG_BIT (reload_reg_used_in_op_addr, i); | |
4486 | break; | |
4487 | ||
893bc853 RK |
4488 | case RELOAD_FOR_OPADDR_ADDR: |
4489 | SET_HARD_REG_BIT (reload_reg_used_in_op_addr_reload, i); | |
4490 | break; | |
4491 | ||
546b63fb RK |
4492 | case RELOAD_FOR_OTHER_ADDRESS: |
4493 | SET_HARD_REG_BIT (reload_reg_used_in_other_addr, i); | |
4494 | break; | |
4495 | ||
32131a9c | 4496 | case RELOAD_FOR_INPUT: |
546b63fb | 4497 | SET_HARD_REG_BIT (reload_reg_used_in_input[opnum], i); |
32131a9c RK |
4498 | break; |
4499 | ||
4500 | case RELOAD_FOR_OUTPUT: | |
546b63fb RK |
4501 | SET_HARD_REG_BIT (reload_reg_used_in_output[opnum], i); |
4502 | break; | |
4503 | ||
4504 | case RELOAD_FOR_INSN: | |
4505 | SET_HARD_REG_BIT (reload_reg_used_in_insn, i); | |
32131a9c RK |
4506 | break; |
4507 | } | |
4508 | ||
4509 | SET_HARD_REG_BIT (reload_reg_used_at_all, i); | |
4510 | } | |
4511 | } | |
4512 | ||
be7ae2a4 RK |
4513 | /* Similarly, but show REGNO is no longer in use for a reload. */ |
4514 | ||
4515 | static void | |
4516 | clear_reload_reg_in_use (regno, opnum, type, mode) | |
4517 | int regno; | |
4518 | int opnum; | |
4519 | enum reload_type type; | |
4520 | enum machine_mode mode; | |
4521 | { | |
4522 | int nregs = HARD_REGNO_NREGS (regno, mode); | |
cb2afeb3 | 4523 | int start_regno, end_regno; |
be7ae2a4 | 4524 | int i; |
cb2afeb3 R |
4525 | /* A complication is that for some reload types, inheritance might |
4526 | allow multiple reloads of the same types to share a reload register. | |
4527 | We set check_opnum if we have to check only reloads with the same | |
4528 | operand number, and check_any if we have to check all reloads. */ | |
4529 | int check_opnum = 0; | |
4530 | int check_any = 0; | |
4531 | HARD_REG_SET *used_in_set; | |
be7ae2a4 | 4532 | |
cb2afeb3 | 4533 | switch (type) |
be7ae2a4 | 4534 | { |
cb2afeb3 R |
4535 | case RELOAD_OTHER: |
4536 | used_in_set = &reload_reg_used; | |
4537 | break; | |
be7ae2a4 | 4538 | |
cb2afeb3 R |
4539 | case RELOAD_FOR_INPUT_ADDRESS: |
4540 | used_in_set = &reload_reg_used_in_input_addr[opnum]; | |
4541 | break; | |
be7ae2a4 | 4542 | |
cb2afeb3 R |
4543 | case RELOAD_FOR_INPADDR_ADDRESS: |
4544 | check_opnum = 1; | |
4545 | used_in_set = &reload_reg_used_in_inpaddr_addr[opnum]; | |
4546 | break; | |
47c8cf91 | 4547 | |
cb2afeb3 R |
4548 | case RELOAD_FOR_OUTPUT_ADDRESS: |
4549 | used_in_set = &reload_reg_used_in_output_addr[opnum]; | |
4550 | break; | |
be7ae2a4 | 4551 | |
cb2afeb3 R |
4552 | case RELOAD_FOR_OUTADDR_ADDRESS: |
4553 | check_opnum = 1; | |
4554 | used_in_set = &reload_reg_used_in_outaddr_addr[opnum]; | |
4555 | break; | |
47c8cf91 | 4556 | |
cb2afeb3 R |
4557 | case RELOAD_FOR_OPERAND_ADDRESS: |
4558 | used_in_set = &reload_reg_used_in_op_addr; | |
4559 | break; | |
be7ae2a4 | 4560 | |
cb2afeb3 R |
4561 | case RELOAD_FOR_OPADDR_ADDR: |
4562 | check_any = 1; | |
4563 | used_in_set = &reload_reg_used_in_op_addr_reload; | |
4564 | break; | |
893bc853 | 4565 | |
cb2afeb3 R |
4566 | case RELOAD_FOR_OTHER_ADDRESS: |
4567 | used_in_set = &reload_reg_used_in_other_addr; | |
4568 | check_any = 1; | |
4569 | break; | |
be7ae2a4 | 4570 | |
cb2afeb3 R |
4571 | case RELOAD_FOR_INPUT: |
4572 | used_in_set = &reload_reg_used_in_input[opnum]; | |
4573 | break; | |
be7ae2a4 | 4574 | |
cb2afeb3 R |
4575 | case RELOAD_FOR_OUTPUT: |
4576 | used_in_set = &reload_reg_used_in_output[opnum]; | |
4577 | break; | |
be7ae2a4 | 4578 | |
cb2afeb3 R |
4579 | case RELOAD_FOR_INSN: |
4580 | used_in_set = &reload_reg_used_in_insn; | |
4581 | break; | |
4582 | default: | |
4583 | abort (); | |
4584 | } | |
4585 | /* We resolve conflicts with remaining reloads of the same type by | |
4586 | excluding the intervals of of reload registers by them from the | |
4587 | interval of freed reload registers. Since we only keep track of | |
4588 | one set of interval bounds, we might have to exclude somewhat | |
4589 | more then what would be necessary if we used a HARD_REG_SET here. | |
4590 | But this should only happen very infrequently, so there should | |
4591 | be no reason to worry about it. */ | |
4592 | ||
4593 | start_regno = regno; | |
4594 | end_regno = regno + nregs; | |
4595 | if (check_opnum || check_any) | |
4596 | { | |
4597 | for (i = n_reloads - 1; i >= 0; i--) | |
4598 | { | |
4599 | if (reload_when_needed[i] == type | |
4600 | && (check_any || reload_opnum[i] == opnum) | |
4601 | && reload_reg_rtx[i]) | |
4602 | { | |
4603 | int conflict_start = true_regnum (reload_reg_rtx[i]); | |
4604 | int conflict_end | |
4605 | = (conflict_start | |
4606 | + HARD_REGNO_NREGS (conflict_start, reload_mode[i])); | |
4607 | ||
4608 | /* If there is an overlap with the first to-be-freed register, | |
4609 | adjust the interval start. */ | |
4610 | if (conflict_start <= start_regno && conflict_end > start_regno) | |
4611 | start_regno = conflict_end; | |
4612 | /* Otherwise, if there is a conflict with one of the other | |
4613 | to-be-freed registers, adjust the interval end. */ | |
4614 | if (conflict_start > start_regno && conflict_start < end_regno) | |
4615 | end_regno = conflict_start; | |
4616 | } | |
be7ae2a4 RK |
4617 | } |
4618 | } | |
cb2afeb3 R |
4619 | for (i = start_regno; i < end_regno; i++) |
4620 | CLEAR_HARD_REG_BIT (*used_in_set, i); | |
be7ae2a4 RK |
4621 | } |
4622 | ||
32131a9c | 4623 | /* 1 if reg REGNO is free as a reload reg for a reload of the sort |
546b63fb | 4624 | specified by OPNUM and TYPE. */ |
32131a9c RK |
4625 | |
4626 | static int | |
546b63fb | 4627 | reload_reg_free_p (regno, opnum, type) |
32131a9c | 4628 | int regno; |
546b63fb RK |
4629 | int opnum; |
4630 | enum reload_type type; | |
32131a9c | 4631 | { |
546b63fb RK |
4632 | int i; |
4633 | ||
2edc8d65 RK |
4634 | /* In use for a RELOAD_OTHER means it's not available for anything. */ |
4635 | if (TEST_HARD_REG_BIT (reload_reg_used, regno)) | |
32131a9c | 4636 | return 0; |
546b63fb RK |
4637 | |
4638 | switch (type) | |
32131a9c RK |
4639 | { |
4640 | case RELOAD_OTHER: | |
2edc8d65 RK |
4641 | /* In use for anything means we can't use it for RELOAD_OTHER. */ |
4642 | if (TEST_HARD_REG_BIT (reload_reg_used_in_other_addr, regno) | |
224f1d71 RK |
4643 | || TEST_HARD_REG_BIT (reload_reg_used_in_op_addr, regno) |
4644 | || TEST_HARD_REG_BIT (reload_reg_used_in_insn, regno)) | |
4645 | return 0; | |
4646 | ||
4647 | for (i = 0; i < reload_n_operands; i++) | |
4648 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input_addr[i], regno) | |
47c8cf91 | 4649 | || TEST_HARD_REG_BIT (reload_reg_used_in_inpaddr_addr[i], regno) |
224f1d71 | 4650 | || TEST_HARD_REG_BIT (reload_reg_used_in_output_addr[i], regno) |
47c8cf91 | 4651 | || TEST_HARD_REG_BIT (reload_reg_used_in_outaddr_addr[i], regno) |
224f1d71 RK |
4652 | || TEST_HARD_REG_BIT (reload_reg_used_in_input[i], regno) |
4653 | || TEST_HARD_REG_BIT (reload_reg_used_in_output[i], regno)) | |
4654 | return 0; | |
4655 | ||
4656 | return 1; | |
32131a9c | 4657 | |
32131a9c | 4658 | case RELOAD_FOR_INPUT: |
546b63fb RK |
4659 | if (TEST_HARD_REG_BIT (reload_reg_used_in_insn, regno) |
4660 | || TEST_HARD_REG_BIT (reload_reg_used_in_op_addr, regno)) | |
4661 | return 0; | |
4662 | ||
893bc853 RK |
4663 | if (TEST_HARD_REG_BIT (reload_reg_used_in_op_addr_reload, regno)) |
4664 | return 0; | |
4665 | ||
546b63fb RK |
4666 | /* If it is used for some other input, can't use it. */ |
4667 | for (i = 0; i < reload_n_operands; i++) | |
4668 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input[i], regno)) | |
4669 | return 0; | |
4670 | ||
4671 | /* If it is used in a later operand's address, can't use it. */ | |
4672 | for (i = opnum + 1; i < reload_n_operands; i++) | |
47c8cf91 ILT |
4673 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input_addr[i], regno) |
4674 | || TEST_HARD_REG_BIT (reload_reg_used_in_inpaddr_addr[i], regno)) | |
546b63fb RK |
4675 | return 0; |
4676 | ||
4677 | return 1; | |
4678 | ||
4679 | case RELOAD_FOR_INPUT_ADDRESS: | |
4680 | /* Can't use a register if it is used for an input address for this | |
4681 | operand or used as an input in an earlier one. */ | |
47c8cf91 ILT |
4682 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input_addr[opnum], regno) |
4683 | || TEST_HARD_REG_BIT (reload_reg_used_in_inpaddr_addr[opnum], regno)) | |
4684 | return 0; | |
4685 | ||
4686 | for (i = 0; i < opnum; i++) | |
4687 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input[i], regno)) | |
4688 | return 0; | |
4689 | ||
4690 | return 1; | |
4691 | ||
4692 | case RELOAD_FOR_INPADDR_ADDRESS: | |
4693 | /* Can't use a register if it is used for an input address | |
38e01259 | 4694 | for this operand or used as an input in an earlier |
47c8cf91 ILT |
4695 | one. */ |
4696 | if (TEST_HARD_REG_BIT (reload_reg_used_in_inpaddr_addr[opnum], regno)) | |
546b63fb RK |
4697 | return 0; |
4698 | ||
4699 | for (i = 0; i < opnum; i++) | |
4700 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input[i], regno)) | |
4701 | return 0; | |
4702 | ||
4703 | return 1; | |
4704 | ||
4705 | case RELOAD_FOR_OUTPUT_ADDRESS: | |
4706 | /* Can't use a register if it is used for an output address for this | |
4707 | operand or used as an output in this or a later operand. */ | |
4708 | if (TEST_HARD_REG_BIT (reload_reg_used_in_output_addr[opnum], regno)) | |
4709 | return 0; | |
4710 | ||
4711 | for (i = opnum; i < reload_n_operands; i++) | |
4712 | if (TEST_HARD_REG_BIT (reload_reg_used_in_output[i], regno)) | |
4713 | return 0; | |
4714 | ||
4715 | return 1; | |
4716 | ||
47c8cf91 ILT |
4717 | case RELOAD_FOR_OUTADDR_ADDRESS: |
4718 | /* Can't use a register if it is used for an output address | |
38e01259 | 4719 | for this operand or used as an output in this or a |
47c8cf91 ILT |
4720 | later operand. */ |
4721 | if (TEST_HARD_REG_BIT (reload_reg_used_in_outaddr_addr[opnum], regno)) | |
4722 | return 0; | |
4723 | ||
4724 | for (i = opnum; i < reload_n_operands; i++) | |
4725 | if (TEST_HARD_REG_BIT (reload_reg_used_in_output[i], regno)) | |
4726 | return 0; | |
4727 | ||
4728 | return 1; | |
4729 | ||
32131a9c | 4730 | case RELOAD_FOR_OPERAND_ADDRESS: |
546b63fb RK |
4731 | for (i = 0; i < reload_n_operands; i++) |
4732 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input[i], regno)) | |
4733 | return 0; | |
4734 | ||
4735 | return (! TEST_HARD_REG_BIT (reload_reg_used_in_insn, regno) | |
4736 | && ! TEST_HARD_REG_BIT (reload_reg_used_in_op_addr, regno)); | |
4737 | ||
893bc853 RK |
4738 | case RELOAD_FOR_OPADDR_ADDR: |
4739 | for (i = 0; i < reload_n_operands; i++) | |
4740 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input[i], regno)) | |
4741 | return 0; | |
4742 | ||
a94ce333 | 4743 | return (!TEST_HARD_REG_BIT (reload_reg_used_in_op_addr_reload, regno)); |
893bc853 | 4744 | |
32131a9c | 4745 | case RELOAD_FOR_OUTPUT: |
546b63fb RK |
4746 | /* This cannot share a register with RELOAD_FOR_INSN reloads, other |
4747 | outputs, or an operand address for this or an earlier output. */ | |
4748 | if (TEST_HARD_REG_BIT (reload_reg_used_in_insn, regno)) | |
4749 | return 0; | |
4750 | ||
4751 | for (i = 0; i < reload_n_operands; i++) | |
4752 | if (TEST_HARD_REG_BIT (reload_reg_used_in_output[i], regno)) | |
4753 | return 0; | |
4754 | ||
4755 | for (i = 0; i <= opnum; i++) | |
47c8cf91 ILT |
4756 | if (TEST_HARD_REG_BIT (reload_reg_used_in_output_addr[i], regno) |
4757 | || TEST_HARD_REG_BIT (reload_reg_used_in_outaddr_addr[i], regno)) | |
546b63fb RK |
4758 | return 0; |
4759 | ||
4760 | return 1; | |
4761 | ||
4762 | case RELOAD_FOR_INSN: | |
4763 | for (i = 0; i < reload_n_operands; i++) | |
4764 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input[i], regno) | |
4765 | || TEST_HARD_REG_BIT (reload_reg_used_in_output[i], regno)) | |
4766 | return 0; | |
4767 | ||
4768 | return (! TEST_HARD_REG_BIT (reload_reg_used_in_insn, regno) | |
4769 | && ! TEST_HARD_REG_BIT (reload_reg_used_in_op_addr, regno)); | |
4770 | ||
4771 | case RELOAD_FOR_OTHER_ADDRESS: | |
4772 | return ! TEST_HARD_REG_BIT (reload_reg_used_in_other_addr, regno); | |
32131a9c RK |
4773 | } |
4774 | abort (); | |
4775 | } | |
4776 | ||
4777 | /* Return 1 if the value in reload reg REGNO, as used by a reload | |
546b63fb | 4778 | needed for the part of the insn specified by OPNUM and TYPE, |
32131a9c RK |
4779 | is not in use for a reload in any prior part of the insn. |
4780 | ||
4781 | We can assume that the reload reg was already tested for availability | |
4782 | at the time it is needed, and we should not check this again, | |
6f77675f R |
4783 | in case the reg has already been marked in use. |
4784 | ||
4785 | However, if EQUIV is set, we are checking the availability of a register | |
4786 | holding an equivalence to the value to be loaded into the reload register, | |
4787 | not the availability of the reload register itself. | |
4788 | ||
4789 | This is still less stringent than what reload_reg_free_p checks; for | |
4790 | example, compare the checks for RELOAD_OTHER. */ | |
32131a9c RK |
4791 | |
4792 | static int | |
6f77675f | 4793 | reload_reg_free_before_p (regno, opnum, type, equiv) |
32131a9c | 4794 | int regno; |
546b63fb RK |
4795 | int opnum; |
4796 | enum reload_type type; | |
6f77675f | 4797 | int equiv; |
32131a9c | 4798 | { |
546b63fb RK |
4799 | int i; |
4800 | ||
b1fc873c JL |
4801 | /* The code to handle EQUIV below is wrong. |
4802 | ||
4803 | If we wnat to know if a value in a particular reload register is available | |
4804 | at a particular point in time during reloading, we must check *all* | |
4805 | prior reloads to see if they clobber the value. | |
4806 | ||
4807 | Note this is significantly different from determining when a register is | |
4808 | free for usage in a reload! | |
4809 | ||
4810 | This change is temporary. It will go away. */ | |
4811 | if (equiv) | |
4812 | return 0; | |
4813 | ||
546b63fb | 4814 | switch (type) |
32131a9c | 4815 | { |
546b63fb RK |
4816 | case RELOAD_FOR_OTHER_ADDRESS: |
4817 | /* These always come first. */ | |
6f77675f R |
4818 | if (equiv && TEST_HARD_REG_BIT (reload_reg_used_in_other_addr, regno)) |
4819 | return 0; | |
32131a9c RK |
4820 | return 1; |
4821 | ||
546b63fb | 4822 | case RELOAD_OTHER: |
6f77675f R |
4823 | if (equiv && TEST_HARD_REG_BIT (reload_reg_used, regno)) |
4824 | return 0; | |
546b63fb RK |
4825 | return ! TEST_HARD_REG_BIT (reload_reg_used_in_other_addr, regno); |
4826 | ||
32131a9c | 4827 | /* If this use is for part of the insn, |
546b63fb RK |
4828 | check the reg is not in use for any prior part. It is tempting |
4829 | to try to do this by falling through from objecs that occur | |
4830 | later in the insn to ones that occur earlier, but that will not | |
4831 | correctly take into account the fact that here we MUST ignore | |
4832 | things that would prevent the register from being allocated in | |
4833 | the first place, since we know that it was allocated. */ | |
4834 | ||
4835 | case RELOAD_FOR_OUTPUT_ADDRESS: | |
6f77675f R |
4836 | if (equiv |
4837 | && TEST_HARD_REG_BIT (reload_reg_used_in_output_addr[opnum], regno)) | |
4838 | return 0; | |
d7921434 | 4839 | /* Earlier reloads include RELOAD_FOR_OUTADDR_ADDRESS reloads. */ |
75528b80 R |
4840 | if (TEST_HARD_REG_BIT (reload_reg_used_in_outaddr_addr[opnum], regno)) |
4841 | return 0; | |
4842 | /* ... fall through ... */ | |
47c8cf91 | 4843 | case RELOAD_FOR_OUTADDR_ADDRESS: |
6f77675f R |
4844 | if (equiv |
4845 | && (TEST_HARD_REG_BIT (reload_reg_used_in_outaddr_addr[opnum], regno) | |
4846 | || TEST_HARD_REG_BIT (reload_reg_used, regno))) | |
4847 | return 0; | |
546b63fb RK |
4848 | /* Earlier reloads are for earlier outputs or their addresses, |
4849 | any RELOAD_FOR_INSN reloads, any inputs or their addresses, or any | |
4850 | RELOAD_FOR_OTHER_ADDRESS reloads (we know it can't conflict with | |
4851 | RELOAD_OTHER).. */ | |
4852 | for (i = 0; i < opnum; i++) | |
4853 | if (TEST_HARD_REG_BIT (reload_reg_used_in_output_addr[i], regno) | |
6f77675f | 4854 | || TEST_HARD_REG_BIT (reload_reg_used_in_outaddr_addr[i], regno)) |
546b63fb RK |
4855 | return 0; |
4856 | ||
4857 | if (TEST_HARD_REG_BIT (reload_reg_used_in_insn, regno)) | |
32131a9c | 4858 | return 0; |
546b63fb RK |
4859 | |
4860 | for (i = 0; i < reload_n_operands; i++) | |
4861 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input_addr[i], regno) | |
47c8cf91 | 4862 | || TEST_HARD_REG_BIT (reload_reg_used_in_inpaddr_addr[i], regno) |
6f77675f R |
4863 | || TEST_HARD_REG_BIT (reload_reg_used_in_input[i], regno) |
4864 | || TEST_HARD_REG_BIT (reload_reg_used_in_output[i], regno)) | |
546b63fb RK |
4865 | return 0; |
4866 | ||
4867 | return (! TEST_HARD_REG_BIT (reload_reg_used_in_other_addr, regno) | |
4868 | && ! TEST_HARD_REG_BIT (reload_reg_used_in_insn, regno) | |
979e20e9 | 4869 | && ! TEST_HARD_REG_BIT (reload_reg_used_in_op_addr_reload, regno) |
546b63fb RK |
4870 | && ! TEST_HARD_REG_BIT (reload_reg_used_in_op_addr, regno)); |
4871 | ||
32131a9c | 4872 | case RELOAD_FOR_OUTPUT: |
6f77675f | 4873 | case RELOAD_FOR_INSN: |
518b6ce3 R |
4874 | /* There is no reason to call this function for output reloads, thus |
4875 | anything we'd put here wouldn't be tested. So just abort. */ | |
4876 | abort (); | |
546b63fb | 4877 | |
32131a9c | 4878 | case RELOAD_FOR_OPERAND_ADDRESS: |
6f77675f R |
4879 | if (equiv && TEST_HARD_REG_BIT (reload_reg_used_in_op_addr, regno)) |
4880 | return 0; | |
4881 | ||
a94ce333 JW |
4882 | /* Earlier reloads include RELOAD_FOR_OPADDR_ADDR reloads. */ |
4883 | if (TEST_HARD_REG_BIT (reload_reg_used_in_op_addr_reload, regno)) | |
4884 | return 0; | |
4885 | ||
4886 | /* ... fall through ... */ | |
4887 | ||
893bc853 | 4888 | case RELOAD_FOR_OPADDR_ADDR: |
6f77675f R |
4889 | if (equiv) |
4890 | { | |
4891 | if (TEST_HARD_REG_BIT (reload_reg_used_in_op_addr_reload, regno) | |
4892 | || TEST_HARD_REG_BIT (reload_reg_used, regno)) | |
4893 | return 0; | |
4894 | for (i = 0; i < reload_n_operands; i++) | |
4895 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input[i], regno)) | |
4896 | return 0; | |
4897 | } | |
546b63fb RK |
4898 | /* These can't conflict with inputs, or each other, so all we have to |
4899 | test is input addresses and the addresses of OTHER items. */ | |
4900 | ||
4901 | for (i = 0; i < reload_n_operands; i++) | |
47c8cf91 ILT |
4902 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input_addr[i], regno) |
4903 | || TEST_HARD_REG_BIT (reload_reg_used_in_inpaddr_addr[i], regno)) | |
546b63fb RK |
4904 | return 0; |
4905 | ||
4906 | return ! TEST_HARD_REG_BIT (reload_reg_used_in_other_addr, regno); | |
4907 | ||
32131a9c | 4908 | case RELOAD_FOR_INPUT: |
6f77675f R |
4909 | if (equiv && TEST_HARD_REG_BIT (reload_reg_used, regno)) |
4910 | return 0; | |
4911 | ||
5bc80b30 JL |
4912 | /* The only things earlier are the address for this and |
4913 | earlier inputs, other inputs (which we know we don't conflict | |
cb2afeb3 R |
4914 | with), and addresses of RELOAD_OTHER objects. |
4915 | We can ignore the conflict with addresses of this operand, since | |
4916 | when we inherit this operand, its address reloads are discarded. */ | |
546b63fb | 4917 | |
cb2afeb3 | 4918 | for (i = 0; i < opnum; i++) |
47c8cf91 | 4919 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input_addr[i], regno) |
5bc80b30 | 4920 | || TEST_HARD_REG_BIT (reload_reg_used_in_inpaddr_addr[i], regno)) |
546b63fb RK |
4921 | return 0; |
4922 | ||
4923 | return ! TEST_HARD_REG_BIT (reload_reg_used_in_other_addr, regno); | |
4924 | ||
4925 | case RELOAD_FOR_INPUT_ADDRESS: | |
75528b80 R |
4926 | /* Earlier reloads include RELOAD_FOR_INPADDR_ADDRESS reloads. */ |
4927 | if (TEST_HARD_REG_BIT (reload_reg_used_in_inpaddr_addr[opnum], regno)) | |
4928 | return 0; | |
4929 | /* ... fall through ... */ | |
47c8cf91 | 4930 | case RELOAD_FOR_INPADDR_ADDRESS: |
6f77675f R |
4931 | if (equiv && TEST_HARD_REG_BIT (reload_reg_used, regno)) |
4932 | return 0; | |
4933 | ||
546b63fb RK |
4934 | /* Similarly, all we have to check is for use in earlier inputs' |
4935 | addresses. */ | |
4936 | for (i = 0; i < opnum; i++) | |
47c8cf91 ILT |
4937 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input_addr[i], regno) |
4938 | || TEST_HARD_REG_BIT (reload_reg_used_in_inpaddr_addr[i], regno)) | |
546b63fb RK |
4939 | return 0; |
4940 | ||
4941 | return ! TEST_HARD_REG_BIT (reload_reg_used_in_other_addr, regno); | |
32131a9c RK |
4942 | } |
4943 | abort (); | |
4944 | } | |
4945 | ||
4946 | /* Return 1 if the value in reload reg REGNO, as used by a reload | |
546b63fb | 4947 | needed for the part of the insn specified by OPNUM and TYPE, |
32131a9c RK |
4948 | is still available in REGNO at the end of the insn. |
4949 | ||
4950 | We can assume that the reload reg was already tested for availability | |
4951 | at the time it is needed, and we should not check this again, | |
4952 | in case the reg has already been marked in use. */ | |
4953 | ||
4954 | static int | |
546b63fb | 4955 | reload_reg_reaches_end_p (regno, opnum, type) |
32131a9c | 4956 | int regno; |
546b63fb RK |
4957 | int opnum; |
4958 | enum reload_type type; | |
32131a9c | 4959 | { |
546b63fb RK |
4960 | int i; |
4961 | ||
4962 | switch (type) | |
32131a9c RK |
4963 | { |
4964 | case RELOAD_OTHER: | |
4965 | /* Since a RELOAD_OTHER reload claims the reg for the entire insn, | |
4966 | its value must reach the end. */ | |
4967 | return 1; | |
4968 | ||
4969 | /* If this use is for part of the insn, | |
546b63fb RK |
4970 | its value reaches if no subsequent part uses the same register. |
4971 | Just like the above function, don't try to do this with lots | |
4972 | of fallthroughs. */ | |
4973 | ||
4974 | case RELOAD_FOR_OTHER_ADDRESS: | |
4975 | /* Here we check for everything else, since these don't conflict | |
4976 | with anything else and everything comes later. */ | |
4977 | ||
4978 | for (i = 0; i < reload_n_operands; i++) | |
4979 | if (TEST_HARD_REG_BIT (reload_reg_used_in_output_addr[i], regno) | |
47c8cf91 | 4980 | || TEST_HARD_REG_BIT (reload_reg_used_in_outaddr_addr[i], regno) |
546b63fb RK |
4981 | || TEST_HARD_REG_BIT (reload_reg_used_in_output[i], regno) |
4982 | || TEST_HARD_REG_BIT (reload_reg_used_in_input_addr[i], regno) | |
47c8cf91 | 4983 | || TEST_HARD_REG_BIT (reload_reg_used_in_inpaddr_addr[i], regno) |
546b63fb RK |
4984 | || TEST_HARD_REG_BIT (reload_reg_used_in_input[i], regno)) |
4985 | return 0; | |
4986 | ||
4987 | return (! TEST_HARD_REG_BIT (reload_reg_used_in_op_addr, regno) | |
4988 | && ! TEST_HARD_REG_BIT (reload_reg_used_in_insn, regno) | |
4989 | && ! TEST_HARD_REG_BIT (reload_reg_used, regno)); | |
4990 | ||
4991 | case RELOAD_FOR_INPUT_ADDRESS: | |
47c8cf91 | 4992 | case RELOAD_FOR_INPADDR_ADDRESS: |
546b63fb RK |
4993 | /* Similar, except that we check only for this and subsequent inputs |
4994 | and the address of only subsequent inputs and we do not need | |
4995 | to check for RELOAD_OTHER objects since they are known not to | |
4996 | conflict. */ | |
4997 | ||
4998 | for (i = opnum; i < reload_n_operands; i++) | |
4999 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input[i], regno)) | |
5000 | return 0; | |
5001 | ||
5002 | for (i = opnum + 1; i < reload_n_operands; i++) | |
47c8cf91 ILT |
5003 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input_addr[i], regno) |
5004 | || TEST_HARD_REG_BIT (reload_reg_used_in_inpaddr_addr[i], regno)) | |
546b63fb RK |
5005 | return 0; |
5006 | ||
5007 | for (i = 0; i < reload_n_operands; i++) | |
5008 | if (TEST_HARD_REG_BIT (reload_reg_used_in_output_addr[i], regno) | |
47c8cf91 | 5009 | || TEST_HARD_REG_BIT (reload_reg_used_in_outaddr_addr[i], regno) |
546b63fb RK |
5010 | || TEST_HARD_REG_BIT (reload_reg_used_in_output[i], regno)) |
5011 | return 0; | |
5012 | ||
893bc853 RK |
5013 | if (TEST_HARD_REG_BIT (reload_reg_used_in_op_addr_reload, regno)) |
5014 | return 0; | |
5015 | ||
546b63fb RK |
5016 | return (! TEST_HARD_REG_BIT (reload_reg_used_in_op_addr, regno) |
5017 | && ! TEST_HARD_REG_BIT (reload_reg_used_in_insn, regno)); | |
5018 | ||
32131a9c | 5019 | case RELOAD_FOR_INPUT: |
546b63fb RK |
5020 | /* Similar to input address, except we start at the next operand for |
5021 | both input and input address and we do not check for | |
5022 | RELOAD_FOR_OPERAND_ADDRESS and RELOAD_FOR_INSN since these | |
5023 | would conflict. */ | |
5024 | ||
5025 | for (i = opnum + 1; i < reload_n_operands; i++) | |
5026 | if (TEST_HARD_REG_BIT (reload_reg_used_in_input_addr[i], regno) | |
47c8cf91 | 5027 | || TEST_HARD_REG_BIT (reload_reg_used_in_inpaddr_addr[i], regno) |
546b63fb RK |
5028 | || TEST_HARD_REG_BIT (reload_reg_used_in_input[i], regno)) |
5029 | return 0; | |
5030 | ||
0f41302f | 5031 | /* ... fall through ... */ |
546b63fb | 5032 | |
32131a9c | 5033 | case RELOAD_FOR_OPERAND_ADDRESS: |
546b63fb RK |
5034 | /* Check outputs and their addresses. */ |
5035 | ||
5036 | for (i = 0; i < reload_n_operands; i++) | |
5037 | if (TEST_HARD_REG_BIT (reload_reg_used_in_output_addr[i], regno) | |
47c8cf91 | 5038 | || TEST_HARD_REG_BIT (reload_reg_used_in_outaddr_addr[i], regno) |
546b63fb RK |
5039 | || TEST_HARD_REG_BIT (reload_reg_used_in_output[i], regno)) |
5040 | return 0; | |
5041 | ||
5042 | return 1; | |
5043 | ||
893bc853 RK |
5044 | case RELOAD_FOR_OPADDR_ADDR: |
5045 | for (i = 0; i < reload_n_operands; i++) | |
5046 | if (TEST_HARD_REG_BIT (reload_reg_used_in_output_addr[i], regno) | |
47c8cf91 | 5047 | || TEST_HARD_REG_BIT (reload_reg_used_in_outaddr_addr[i], regno) |
893bc853 RK |
5048 | || TEST_HARD_REG_BIT (reload_reg_used_in_output[i], regno)) |
5049 | return 0; | |
5050 | ||
a94ce333 JW |
5051 | return (! TEST_HARD_REG_BIT (reload_reg_used_in_op_addr, regno) |
5052 | && !TEST_HARD_REG_BIT (reload_reg_used_in_insn, regno)); | |
893bc853 | 5053 | |
546b63fb | 5054 | case RELOAD_FOR_INSN: |
893bc853 | 5055 | /* These conflict with other outputs with RELOAD_OTHER. So |
546b63fb RK |
5056 | we need only check for output addresses. */ |
5057 | ||
5058 | opnum = -1; | |
5059 | ||
0f41302f | 5060 | /* ... fall through ... */ |
546b63fb | 5061 | |
32131a9c | 5062 | case RELOAD_FOR_OUTPUT: |
546b63fb | 5063 | case RELOAD_FOR_OUTPUT_ADDRESS: |
47c8cf91 | 5064 | case RELOAD_FOR_OUTADDR_ADDRESS: |
546b63fb RK |
5065 | /* We already know these can't conflict with a later output. So the |
5066 | only thing to check are later output addresses. */ | |
5067 | for (i = opnum + 1; i < reload_n_operands; i++) | |
47c8cf91 ILT |
5068 | if (TEST_HARD_REG_BIT (reload_reg_used_in_output_addr[i], regno) |
5069 | || TEST_HARD_REG_BIT (reload_reg_used_in_outaddr_addr[i], regno)) | |
546b63fb RK |
5070 | return 0; |
5071 | ||
32131a9c RK |
5072 | return 1; |
5073 | } | |
546b63fb | 5074 | |
32131a9c RK |
5075 | abort (); |
5076 | } | |
5077 | \f | |
351aa1c1 RK |
5078 | /* Return 1 if the reloads denoted by R1 and R2 cannot share a register. |
5079 | Return 0 otherwise. | |
5080 | ||
5081 | This function uses the same algorithm as reload_reg_free_p above. */ | |
5082 | ||
f5963e61 | 5083 | int |
351aa1c1 RK |
5084 | reloads_conflict (r1, r2) |
5085 | int r1, r2; | |
5086 | { | |
5087 | enum reload_type r1_type = reload_when_needed[r1]; | |
5088 | enum reload_type r2_type = reload_when_needed[r2]; | |
5089 | int r1_opnum = reload_opnum[r1]; | |
5090 | int r2_opnum = reload_opnum[r2]; | |
5091 | ||
2edc8d65 RK |
5092 | /* RELOAD_OTHER conflicts with everything. */ |
5093 | if (r2_type == RELOAD_OTHER) | |
351aa1c1 RK |
5094 | return 1; |
5095 | ||
5096 | /* Otherwise, check conflicts differently for each type. */ | |
5097 | ||
5098 | switch (r1_type) | |
5099 | { | |
5100 | case RELOAD_FOR_INPUT: | |
5101 | return (r2_type == RELOAD_FOR_INSN | |
5102 | || r2_type == RELOAD_FOR_OPERAND_ADDRESS | |
893bc853 | 5103 | || r2_type == RELOAD_FOR_OPADDR_ADDR |
351aa1c1 | 5104 | || r2_type == RELOAD_FOR_INPUT |
47c8cf91 ILT |
5105 | || ((r2_type == RELOAD_FOR_INPUT_ADDRESS |
5106 | || r2_type == RELOAD_FOR_INPADDR_ADDRESS) | |
5107 | && r2_opnum > r1_opnum)); | |
351aa1c1 RK |
5108 | |
5109 | case RELOAD_FOR_INPUT_ADDRESS: | |
5110 | return ((r2_type == RELOAD_FOR_INPUT_ADDRESS && r1_opnum == r2_opnum) | |
5111 | || (r2_type == RELOAD_FOR_INPUT && r2_opnum < r1_opnum)); | |
5112 | ||
47c8cf91 ILT |
5113 | case RELOAD_FOR_INPADDR_ADDRESS: |
5114 | return ((r2_type == RELOAD_FOR_INPADDR_ADDRESS && r1_opnum == r2_opnum) | |
5115 | || (r2_type == RELOAD_FOR_INPUT && r2_opnum < r1_opnum)); | |
5116 | ||
351aa1c1 RK |
5117 | case RELOAD_FOR_OUTPUT_ADDRESS: |
5118 | return ((r2_type == RELOAD_FOR_OUTPUT_ADDRESS && r2_opnum == r1_opnum) | |
5119 | || (r2_type == RELOAD_FOR_OUTPUT && r2_opnum >= r1_opnum)); | |
5120 | ||
47c8cf91 ILT |
5121 | case RELOAD_FOR_OUTADDR_ADDRESS: |
5122 | return ((r2_type == RELOAD_FOR_OUTADDR_ADDRESS && r2_opnum == r1_opnum) | |
5123 | || (r2_type == RELOAD_FOR_OUTPUT && r2_opnum >= r1_opnum)); | |
5124 | ||
351aa1c1 RK |
5125 | case RELOAD_FOR_OPERAND_ADDRESS: |
5126 | return (r2_type == RELOAD_FOR_INPUT || r2_type == RELOAD_FOR_INSN | |
a94ce333 | 5127 | || r2_type == RELOAD_FOR_OPERAND_ADDRESS); |
351aa1c1 | 5128 | |
893bc853 RK |
5129 | case RELOAD_FOR_OPADDR_ADDR: |
5130 | return (r2_type == RELOAD_FOR_INPUT | |
a94ce333 | 5131 | || r2_type == RELOAD_FOR_OPADDR_ADDR); |
893bc853 | 5132 | |
351aa1c1 RK |
5133 | case RELOAD_FOR_OUTPUT: |
5134 | return (r2_type == RELOAD_FOR_INSN || r2_type == RELOAD_FOR_OUTPUT | |
47c8cf91 ILT |
5135 | || ((r2_type == RELOAD_FOR_OUTPUT_ADDRESS |
5136 | || r2_type == RELOAD_FOR_OUTADDR_ADDRESS) | |
351aa1c1 RK |
5137 | && r2_opnum >= r1_opnum)); |
5138 | ||
5139 | case RELOAD_FOR_INSN: | |
5140 | return (r2_type == RELOAD_FOR_INPUT || r2_type == RELOAD_FOR_OUTPUT | |
5141 | || r2_type == RELOAD_FOR_INSN | |
5142 | || r2_type == RELOAD_FOR_OPERAND_ADDRESS); | |
5143 | ||
5144 | case RELOAD_FOR_OTHER_ADDRESS: | |
5145 | return r2_type == RELOAD_FOR_OTHER_ADDRESS; | |
5146 | ||
adab4fc5 | 5147 | case RELOAD_OTHER: |
2edc8d65 | 5148 | return 1; |
adab4fc5 | 5149 | |
351aa1c1 RK |
5150 | default: |
5151 | abort (); | |
5152 | } | |
5153 | } | |
5154 | \f | |
32131a9c RK |
5155 | /* Vector of reload-numbers showing the order in which the reloads should |
5156 | be processed. */ | |
5157 | short reload_order[MAX_RELOADS]; | |
5158 | ||
5159 | /* Indexed by reload number, 1 if incoming value | |
5160 | inherited from previous insns. */ | |
5161 | char reload_inherited[MAX_RELOADS]; | |
5162 | ||
5163 | /* For an inherited reload, this is the insn the reload was inherited from, | |
5164 | if we know it. Otherwise, this is 0. */ | |
5165 | rtx reload_inheritance_insn[MAX_RELOADS]; | |
5166 | ||
5167 | /* If non-zero, this is a place to get the value of the reload, | |
5168 | rather than using reload_in. */ | |
5169 | rtx reload_override_in[MAX_RELOADS]; | |
5170 | ||
e6e52be0 R |
5171 | /* For each reload, the hard register number of the register used, |
5172 | or -1 if we did not need a register for this reload. */ | |
32131a9c RK |
5173 | int reload_spill_index[MAX_RELOADS]; |
5174 | ||
6e684430 R |
5175 | /* Return 1 if the value in reload reg REGNO, as used by a reload |
5176 | needed for the part of the insn specified by OPNUM and TYPE, | |
5177 | may be used to load VALUE into it. | |
f5470689 R |
5178 | |
5179 | Other read-only reloads with the same value do not conflict | |
5180 | unless OUT is non-zero and these other reloads have to live while | |
5181 | output reloads live. | |
5182 | ||
5183 | RELOADNUM is the number of the reload we want to load this value for; | |
5184 | a reload does not conflict with itself. | |
5185 | ||
6e684430 R |
5186 | The caller has to make sure that there is no conflict with the return |
5187 | register. */ | |
5188 | static int | |
f5470689 | 5189 | reload_reg_free_for_value_p (regno, opnum, type, value, out, reloadnum) |
6e684430 R |
5190 | int regno; |
5191 | int opnum; | |
5192 | enum reload_type type; | |
f5470689 R |
5193 | rtx value, out; |
5194 | int reloadnum; | |
6e684430 R |
5195 | { |
5196 | int time1; | |
5197 | int i; | |
5198 | ||
5199 | /* We use some pseudo 'time' value to check if the lifetimes of the | |
5200 | new register use would overlap with the one of a previous reload | |
5201 | that is not read-only or uses a different value. | |
5202 | The 'time' used doesn't have to be linear in any shape or form, just | |
5203 | monotonic. | |
5204 | Some reload types use different 'buckets' for each operand. | |
5205 | So there are MAX_RECOG_OPERANDS different time values for each | |
cecbf6e2 R |
5206 | such reload type. |
5207 | We compute TIME1 as the time when the register for the prospective | |
5208 | new reload ceases to be live, and TIME2 for each existing | |
5209 | reload as the time when that the reload register of that reload | |
5210 | becomes live. | |
5211 | Where there is little to be gained by exact lifetime calculations, | |
5212 | we just make conservative assumptions, i.e. a longer lifetime; | |
5213 | this is done in the 'default:' cases. */ | |
6e684430 R |
5214 | switch (type) |
5215 | { | |
5216 | case RELOAD_FOR_OTHER_ADDRESS: | |
5217 | time1 = 0; | |
5218 | break; | |
5219 | /* For each input, we might have a sequence of RELOAD_FOR_INPADDR_ADDRESS, | |
5220 | RELOAD_FOR_INPUT_ADDRESS and RELOAD_FOR_INPUT. By adding 0 / 1 / 2 , | |
5221 | respectively, to the time values for these, we get distinct time | |
5222 | values. To get distinct time values for each operand, we have to | |
5223 | multiply opnum by at least three. We round that up to four because | |
5224 | multiply by four is often cheaper. */ | |
5225 | case RELOAD_FOR_INPADDR_ADDRESS: | |
5226 | time1 = opnum * 4 + 1; | |
5227 | break; | |
5228 | case RELOAD_FOR_INPUT_ADDRESS: | |
5229 | time1 = opnum * 4 + 2; | |
5230 | break; | |
cb2afeb3 R |
5231 | case RELOAD_FOR_OPADDR_ADDR: |
5232 | /* opnum * 4 + 3 < opnum * 4 + 4 | |
5233 | <= (MAX_RECOG_OPERANDS - 1) * 4 + 4 == MAX_RECOG_OPERANDS * 4 */ | |
5234 | time1 = MAX_RECOG_OPERANDS * 4; | |
5235 | break; | |
6e684430 | 5236 | case RELOAD_FOR_INPUT: |
cecbf6e2 R |
5237 | /* All RELOAD_FOR_INPUT reloads remain live till just before the |
5238 | instruction is executed. */ | |
cb2afeb3 R |
5239 | time1 = MAX_RECOG_OPERANDS * 4 + 1; |
5240 | break; | |
5241 | case RELOAD_FOR_OPERAND_ADDRESS: | |
5242 | /* RELOAD_FOR_OPERAND_ADDRESS reloads are live even while the insn | |
5243 | is executed. */ | |
5244 | time1 = MAX_RECOG_OPERANDS * 4 + 2; | |
6e684430 | 5245 | break; |
6e684430 | 5246 | case RELOAD_FOR_OUTPUT_ADDRESS: |
cb2afeb3 | 5247 | time1 = MAX_RECOG_OPERANDS * 4 + 3 + opnum; |
6e684430 R |
5248 | break; |
5249 | default: | |
cb2afeb3 | 5250 | time1 = MAX_RECOG_OPERANDS * 5 + 3; |
6e684430 R |
5251 | } |
5252 | ||
5253 | for (i = 0; i < n_reloads; i++) | |
5254 | { | |
5255 | rtx reg = reload_reg_rtx[i]; | |
5256 | if (reg && GET_CODE (reg) == REG | |
5257 | && ((unsigned) regno - true_regnum (reg) | |
83e0821b | 5258 | <= HARD_REGNO_NREGS (REGNO (reg), GET_MODE (reg)) - (unsigned)1) |
f5470689 | 5259 | && i != reloadnum) |
6e684430 | 5260 | { |
f5470689 R |
5261 | if (out |
5262 | && reload_when_needed[i] != RELOAD_FOR_INPUT | |
5263 | && reload_when_needed[i] != RELOAD_FOR_INPUT_ADDRESS | |
5264 | && reload_when_needed[i] != RELOAD_FOR_INPADDR_ADDRESS) | |
5265 | return 0; | |
5266 | if (! reload_in[i] || ! rtx_equal_p (reload_in[i], value) | |
5267 | || reload_out[i]) | |
6e684430 | 5268 | { |
f5470689 R |
5269 | int time2; |
5270 | switch (reload_when_needed[i]) | |
5271 | { | |
5272 | case RELOAD_FOR_OTHER_ADDRESS: | |
5273 | time2 = 0; | |
5274 | break; | |
5275 | case RELOAD_FOR_INPADDR_ADDRESS: | |
cb2afeb3 R |
5276 | /* find_reloads makes sure that a |
5277 | RELOAD_FOR_{INP,OP,OUT}ADDR_ADDRESS reload is only used | |
5278 | by at most one - the first - | |
5279 | RELOAD_FOR_{INPUT,OPERAND,OUTPUT}_ADDRESS . If the | |
5280 | address reload is inherited, the address address reload | |
5281 | goes away, so we can ignore this conflict. */ | |
5282 | if (type == RELOAD_FOR_INPUT_ADDRESS && reloadnum == i + 1) | |
5283 | continue; | |
f5470689 R |
5284 | time2 = reload_opnum[i] * 4 + 1; |
5285 | break; | |
5286 | case RELOAD_FOR_INPUT_ADDRESS: | |
5287 | time2 = reload_opnum[i] * 4 + 2; | |
5288 | break; | |
5289 | case RELOAD_FOR_INPUT: | |
5290 | time2 = reload_opnum[i] * 4 + 3; | |
5291 | break; | |
cb2afeb3 R |
5292 | case RELOAD_FOR_OPADDR_ADDR: |
5293 | if (type == RELOAD_FOR_OPERAND_ADDRESS && reloadnum == i + 1) | |
5294 | continue; | |
5295 | time2 = MAX_RECOG_OPERANDS * 4; | |
5296 | break; | |
5297 | case RELOAD_FOR_OPERAND_ADDRESS: | |
5298 | time2 = MAX_RECOG_OPERANDS * 4 + 1; | |
5299 | break; | |
f5470689 R |
5300 | case RELOAD_FOR_OUTPUT: |
5301 | /* All RELOAD_FOR_OUTPUT reloads become live just after the | |
5302 | instruction is executed. */ | |
cb2afeb3 | 5303 | time2 = MAX_RECOG_OPERANDS * 4 + 3; |
f5470689 | 5304 | break; |
cb2afeb3 R |
5305 | case RELOAD_FOR_OUTADDR_ADDRESS: |
5306 | if (type == RELOAD_FOR_OUTPUT_ADDRESS && reloadnum == i + 1) | |
5307 | continue; | |
5308 | /* fall through. */ | |
f5470689 R |
5309 | /* The first RELOAD_FOR_OUTPUT_ADDRESS reload conflicts with the |
5310 | RELOAD_FOR_OUTPUT reloads, so assign it the same time value. */ | |
5311 | case RELOAD_FOR_OUTPUT_ADDRESS: | |
cb2afeb3 | 5312 | time2 = MAX_RECOG_OPERANDS * 4 + 3 + reload_opnum[i]; |
f5470689 R |
5313 | break; |
5314 | case RELOAD_OTHER: | |
5315 | if (! reload_in[i] || rtx_equal_p (reload_in[i], value)) | |
5316 | { | |
cb2afeb3 | 5317 | time2 = MAX_RECOG_OPERANDS * 4 + 3; |
f5470689 R |
5318 | break; |
5319 | } | |
5320 | default: | |
5321 | time2 = 0; | |
5322 | } | |
5323 | if (time1 >= time2) | |
5324 | return 0; | |
6e684430 | 5325 | } |
6e684430 R |
5326 | } |
5327 | } | |
5328 | return 1; | |
5329 | } | |
5330 | ||
32131a9c RK |
5331 | /* Find a spill register to use as a reload register for reload R. |
5332 | LAST_RELOAD is non-zero if this is the last reload for the insn being | |
5333 | processed. | |
5334 | ||
5335 | Set reload_reg_rtx[R] to the register allocated. | |
5336 | ||
5337 | If NOERROR is nonzero, we return 1 if successful, | |
5338 | or 0 if we couldn't find a spill reg and we didn't change anything. */ | |
5339 | ||
5340 | static int | |
7609e720 BS |
5341 | allocate_reload_reg (chain, r, last_reload, noerror) |
5342 | struct insn_chain *chain; | |
32131a9c | 5343 | int r; |
32131a9c RK |
5344 | int last_reload; |
5345 | int noerror; | |
5346 | { | |
7609e720 | 5347 | rtx insn = chain->insn; |
03acd8f8 | 5348 | int i, pass, count, regno; |
32131a9c | 5349 | rtx new; |
32131a9c RK |
5350 | |
5351 | /* If we put this reload ahead, thinking it is a group, | |
5352 | then insist on finding a group. Otherwise we can grab a | |
a8fdc208 | 5353 | reg that some other reload needs. |
32131a9c RK |
5354 | (That can happen when we have a 68000 DATA_OR_FP_REG |
5355 | which is a group of data regs or one fp reg.) | |
5356 | We need not be so restrictive if there are no more reloads | |
5357 | for this insn. | |
5358 | ||
5359 | ??? Really it would be nicer to have smarter handling | |
5360 | for that kind of reg class, where a problem like this is normal. | |
5361 | Perhaps those classes should be avoided for reloading | |
5362 | by use of more alternatives. */ | |
5363 | ||
5364 | int force_group = reload_nregs[r] > 1 && ! last_reload; | |
5365 | ||
5366 | /* If we want a single register and haven't yet found one, | |
5367 | take any reg in the right class and not in use. | |
5368 | If we want a consecutive group, here is where we look for it. | |
5369 | ||
5370 | We use two passes so we can first look for reload regs to | |
5371 | reuse, which are already in use for other reloads in this insn, | |
5372 | and only then use additional registers. | |
5373 | I think that maximizing reuse is needed to make sure we don't | |
5374 | run out of reload regs. Suppose we have three reloads, and | |
5375 | reloads A and B can share regs. These need two regs. | |
5376 | Suppose A and B are given different regs. | |
5377 | That leaves none for C. */ | |
5378 | for (pass = 0; pass < 2; pass++) | |
5379 | { | |
5380 | /* I is the index in spill_regs. | |
5381 | We advance it round-robin between insns to use all spill regs | |
5382 | equally, so that inherited reloads have a chance | |
a5339699 RK |
5383 | of leapfrogging each other. Don't do this, however, when we have |
5384 | group needs and failure would be fatal; if we only have a relatively | |
5385 | small number of spill registers, and more than one of them has | |
5386 | group needs, then by starting in the middle, we may end up | |
5387 | allocating the first one in such a way that we are not left with | |
5388 | sufficient groups to handle the rest. */ | |
5389 | ||
5390 | if (noerror || ! force_group) | |
5391 | i = last_spill_reg; | |
5392 | else | |
5393 | i = -1; | |
5394 | ||
5395 | for (count = 0; count < n_spills; count++) | |
32131a9c RK |
5396 | { |
5397 | int class = (int) reload_reg_class[r]; | |
03acd8f8 | 5398 | int regnum; |
32131a9c | 5399 | |
03acd8f8 BS |
5400 | i++; |
5401 | if (i >= n_spills) | |
5402 | i -= n_spills; | |
5403 | regnum = spill_regs[i]; | |
32131a9c | 5404 | |
03acd8f8 | 5405 | if ((reload_reg_free_p (regnum, reload_opnum[r], |
6e684430 | 5406 | reload_when_needed[r]) |
f5470689 | 5407 | || (reload_in[r] |
6e684430 R |
5408 | /* We check reload_reg_used to make sure we |
5409 | don't clobber the return register. */ | |
03acd8f8 BS |
5410 | && ! TEST_HARD_REG_BIT (reload_reg_used, regnum) |
5411 | && reload_reg_free_for_value_p (regnum, | |
6e684430 R |
5412 | reload_opnum[r], |
5413 | reload_when_needed[r], | |
f5470689 R |
5414 | reload_in[r], |
5415 | reload_out[r], r))) | |
03acd8f8 BS |
5416 | && TEST_HARD_REG_BIT (reg_class_contents[class], regnum) |
5417 | && HARD_REGNO_MODE_OK (regnum, reload_mode[r]) | |
be7ae2a4 RK |
5418 | /* Look first for regs to share, then for unshared. But |
5419 | don't share regs used for inherited reloads; they are | |
5420 | the ones we want to preserve. */ | |
5421 | && (pass | |
5422 | || (TEST_HARD_REG_BIT (reload_reg_used_at_all, | |
03acd8f8 | 5423 | regnum) |
be7ae2a4 | 5424 | && ! TEST_HARD_REG_BIT (reload_reg_used_for_inherit, |
03acd8f8 | 5425 | regnum)))) |
32131a9c | 5426 | { |
03acd8f8 | 5427 | int nr = HARD_REGNO_NREGS (regnum, reload_mode[r]); |
32131a9c RK |
5428 | /* Avoid the problem where spilling a GENERAL_OR_FP_REG |
5429 | (on 68000) got us two FP regs. If NR is 1, | |
5430 | we would reject both of them. */ | |
5431 | if (force_group) | |
5432 | nr = CLASS_MAX_NREGS (reload_reg_class[r], reload_mode[r]); | |
5433 | /* If we need only one reg, we have already won. */ | |
5434 | if (nr == 1) | |
5435 | { | |
5436 | /* But reject a single reg if we demand a group. */ | |
5437 | if (force_group) | |
5438 | continue; | |
5439 | break; | |
5440 | } | |
5441 | /* Otherwise check that as many consecutive regs as we need | |
5442 | are available here. | |
5443 | Also, don't use for a group registers that are | |
5444 | needed for nongroups. */ | |
03acd8f8 | 5445 | if (! TEST_HARD_REG_BIT (chain->counted_for_nongroups, regnum)) |
32131a9c RK |
5446 | while (nr > 1) |
5447 | { | |
03acd8f8 | 5448 | regno = regnum + nr - 1; |
32131a9c RK |
5449 | if (!(TEST_HARD_REG_BIT (reg_class_contents[class], regno) |
5450 | && spill_reg_order[regno] >= 0 | |
546b63fb RK |
5451 | && reload_reg_free_p (regno, reload_opnum[r], |
5452 | reload_when_needed[r]) | |
03acd8f8 | 5453 | && ! TEST_HARD_REG_BIT (chain->counted_for_nongroups, |
32131a9c RK |
5454 | regno))) |
5455 | break; | |
5456 | nr--; | |
5457 | } | |
5458 | if (nr == 1) | |
5459 | break; | |
5460 | } | |
5461 | } | |
5462 | ||
5463 | /* If we found something on pass 1, omit pass 2. */ | |
5464 | if (count < n_spills) | |
5465 | break; | |
5466 | } | |
5467 | ||
5468 | /* We should have found a spill register by now. */ | |
5469 | if (count == n_spills) | |
5470 | { | |
5471 | if (noerror) | |
5472 | return 0; | |
139fc12e | 5473 | goto failure; |
32131a9c RK |
5474 | } |
5475 | ||
be7ae2a4 RK |
5476 | /* I is the index in SPILL_REG_RTX of the reload register we are to |
5477 | allocate. Get an rtx for it and find its register number. */ | |
32131a9c RK |
5478 | |
5479 | new = spill_reg_rtx[i]; | |
5480 | ||
5481 | if (new == 0 || GET_MODE (new) != reload_mode[r]) | |
be7ae2a4 | 5482 | spill_reg_rtx[i] = new |
38a448ca | 5483 | = gen_rtx_REG (reload_mode[r], spill_regs[i]); |
be7ae2a4 | 5484 | |
32131a9c RK |
5485 | regno = true_regnum (new); |
5486 | ||
5487 | /* Detect when the reload reg can't hold the reload mode. | |
5488 | This used to be one `if', but Sequent compiler can't handle that. */ | |
5489 | if (HARD_REGNO_MODE_OK (regno, reload_mode[r])) | |
5490 | { | |
5491 | enum machine_mode test_mode = VOIDmode; | |
5492 | if (reload_in[r]) | |
5493 | test_mode = GET_MODE (reload_in[r]); | |
5494 | /* If reload_in[r] has VOIDmode, it means we will load it | |
5495 | in whatever mode the reload reg has: to wit, reload_mode[r]. | |
5496 | We have already tested that for validity. */ | |
5497 | /* Aside from that, we need to test that the expressions | |
5498 | to reload from or into have modes which are valid for this | |
5499 | reload register. Otherwise the reload insns would be invalid. */ | |
5500 | if (! (reload_in[r] != 0 && test_mode != VOIDmode | |
5501 | && ! HARD_REGNO_MODE_OK (regno, test_mode))) | |
5502 | if (! (reload_out[r] != 0 | |
5503 | && ! HARD_REGNO_MODE_OK (regno, GET_MODE (reload_out[r])))) | |
be7ae2a4 RK |
5504 | { |
5505 | /* The reg is OK. */ | |
5506 | last_spill_reg = i; | |
5507 | ||
5508 | /* Mark as in use for this insn the reload regs we use | |
5509 | for this. */ | |
5510 | mark_reload_reg_in_use (spill_regs[i], reload_opnum[r], | |
5511 | reload_when_needed[r], reload_mode[r]); | |
5512 | ||
5513 | reload_reg_rtx[r] = new; | |
e6e52be0 | 5514 | reload_spill_index[r] = spill_regs[i]; |
be7ae2a4 RK |
5515 | return 1; |
5516 | } | |
32131a9c RK |
5517 | } |
5518 | ||
5519 | /* The reg is not OK. */ | |
5520 | if (noerror) | |
5521 | return 0; | |
5522 | ||
139fc12e | 5523 | failure: |
32131a9c RK |
5524 | if (asm_noperands (PATTERN (insn)) < 0) |
5525 | /* It's the compiler's fault. */ | |
a89b2cc4 | 5526 | fatal_insn ("Could not find a spill register", insn); |
32131a9c RK |
5527 | |
5528 | /* It's the user's fault; the operand's mode and constraint | |
5529 | don't match. Disable this reload so we don't crash in final. */ | |
5530 | error_for_asm (insn, | |
5531 | "`asm' operand constraint incompatible with operand size"); | |
5532 | reload_in[r] = 0; | |
5533 | reload_out[r] = 0; | |
5534 | reload_reg_rtx[r] = 0; | |
5535 | reload_optional[r] = 1; | |
5536 | reload_secondary_p[r] = 1; | |
5537 | ||
5538 | return 1; | |
5539 | } | |
5540 | \f | |
5541 | /* Assign hard reg targets for the pseudo-registers we must reload | |
5542 | into hard regs for this insn. | |
5543 | Also output the instructions to copy them in and out of the hard regs. | |
5544 | ||
5545 | For machines with register classes, we are responsible for | |
5546 | finding a reload reg in the proper class. */ | |
5547 | ||
5548 | static void | |
03acd8f8 | 5549 | choose_reload_regs (chain) |
7609e720 | 5550 | struct insn_chain *chain; |
32131a9c | 5551 | { |
7609e720 | 5552 | rtx insn = chain->insn; |
32131a9c RK |
5553 | register int i, j; |
5554 | int max_group_size = 1; | |
5555 | enum reg_class group_class = NO_REGS; | |
5556 | int inheritance; | |
cb2afeb3 | 5557 | int pass; |
32131a9c RK |
5558 | |
5559 | rtx save_reload_reg_rtx[MAX_RELOADS]; | |
5560 | char save_reload_inherited[MAX_RELOADS]; | |
5561 | rtx save_reload_inheritance_insn[MAX_RELOADS]; | |
5562 | rtx save_reload_override_in[MAX_RELOADS]; | |
5563 | int save_reload_spill_index[MAX_RELOADS]; | |
5564 | HARD_REG_SET save_reload_reg_used; | |
546b63fb | 5565 | HARD_REG_SET save_reload_reg_used_in_input_addr[MAX_RECOG_OPERANDS]; |
47c8cf91 | 5566 | HARD_REG_SET save_reload_reg_used_in_inpaddr_addr[MAX_RECOG_OPERANDS]; |
546b63fb | 5567 | HARD_REG_SET save_reload_reg_used_in_output_addr[MAX_RECOG_OPERANDS]; |
47c8cf91 | 5568 | HARD_REG_SET save_reload_reg_used_in_outaddr_addr[MAX_RECOG_OPERANDS]; |
546b63fb RK |
5569 | HARD_REG_SET save_reload_reg_used_in_input[MAX_RECOG_OPERANDS]; |
5570 | HARD_REG_SET save_reload_reg_used_in_output[MAX_RECOG_OPERANDS]; | |
32131a9c | 5571 | HARD_REG_SET save_reload_reg_used_in_op_addr; |
893bc853 | 5572 | HARD_REG_SET save_reload_reg_used_in_op_addr_reload; |
546b63fb RK |
5573 | HARD_REG_SET save_reload_reg_used_in_insn; |
5574 | HARD_REG_SET save_reload_reg_used_in_other_addr; | |
32131a9c RK |
5575 | HARD_REG_SET save_reload_reg_used_at_all; |
5576 | ||
5577 | bzero (reload_inherited, MAX_RELOADS); | |
4c9a05bc RK |
5578 | bzero ((char *) reload_inheritance_insn, MAX_RELOADS * sizeof (rtx)); |
5579 | bzero ((char *) reload_override_in, MAX_RELOADS * sizeof (rtx)); | |
32131a9c RK |
5580 | |
5581 | CLEAR_HARD_REG_SET (reload_reg_used); | |
5582 | CLEAR_HARD_REG_SET (reload_reg_used_at_all); | |
32131a9c | 5583 | CLEAR_HARD_REG_SET (reload_reg_used_in_op_addr); |
893bc853 | 5584 | CLEAR_HARD_REG_SET (reload_reg_used_in_op_addr_reload); |
546b63fb RK |
5585 | CLEAR_HARD_REG_SET (reload_reg_used_in_insn); |
5586 | CLEAR_HARD_REG_SET (reload_reg_used_in_other_addr); | |
32131a9c | 5587 | |
297927a8 BS |
5588 | CLEAR_HARD_REG_SET (reg_used_by_pseudo); |
5589 | compute_use_by_pseudos (®_used_by_pseudo, chain->live_before); | |
5590 | compute_use_by_pseudos (®_used_by_pseudo, chain->live_after); | |
5591 | ||
546b63fb RK |
5592 | for (i = 0; i < reload_n_operands; i++) |
5593 | { | |
5594 | CLEAR_HARD_REG_SET (reload_reg_used_in_output[i]); | |
5595 | CLEAR_HARD_REG_SET (reload_reg_used_in_input[i]); | |
5596 | CLEAR_HARD_REG_SET (reload_reg_used_in_input_addr[i]); | |
47c8cf91 | 5597 | CLEAR_HARD_REG_SET (reload_reg_used_in_inpaddr_addr[i]); |
546b63fb | 5598 | CLEAR_HARD_REG_SET (reload_reg_used_in_output_addr[i]); |
47c8cf91 | 5599 | CLEAR_HARD_REG_SET (reload_reg_used_in_outaddr_addr[i]); |
546b63fb | 5600 | } |
32131a9c | 5601 | |
03acd8f8 BS |
5602 | IOR_COMPL_HARD_REG_SET (reload_reg_used, chain->used_spill_regs); |
5603 | ||
32131a9c RK |
5604 | #if 0 /* Not needed, now that we can always retry without inheritance. */ |
5605 | /* See if we have more mandatory reloads than spill regs. | |
5606 | If so, then we cannot risk optimizations that could prevent | |
a8fdc208 | 5607 | reloads from sharing one spill register. |
32131a9c RK |
5608 | |
5609 | Since we will try finding a better register than reload_reg_rtx | |
5610 | unless it is equal to reload_in or reload_out, count such reloads. */ | |
5611 | ||
5612 | { | |
03acd8f8 | 5613 | int tem = 0; |
32131a9c RK |
5614 | for (j = 0; j < n_reloads; j++) |
5615 | if (! reload_optional[j] | |
5616 | && (reload_in[j] != 0 || reload_out[j] != 0 || reload_secondary_p[j]) | |
5617 | && (reload_reg_rtx[j] == 0 | |
5618 | || (! rtx_equal_p (reload_reg_rtx[j], reload_in[j]) | |
5619 | && ! rtx_equal_p (reload_reg_rtx[j], reload_out[j])))) | |
5620 | tem++; | |
5621 | if (tem > n_spills) | |
5622 | must_reuse = 1; | |
5623 | } | |
5624 | #endif | |
5625 | ||
32131a9c RK |
5626 | /* In order to be certain of getting the registers we need, |
5627 | we must sort the reloads into order of increasing register class. | |
5628 | Then our grabbing of reload registers will parallel the process | |
a8fdc208 | 5629 | that provided the reload registers. |
32131a9c RK |
5630 | |
5631 | Also note whether any of the reloads wants a consecutive group of regs. | |
5632 | If so, record the maximum size of the group desired and what | |
5633 | register class contains all the groups needed by this insn. */ | |
5634 | ||
5635 | for (j = 0; j < n_reloads; j++) | |
5636 | { | |
5637 | reload_order[j] = j; | |
5638 | reload_spill_index[j] = -1; | |
5639 | ||
5640 | reload_mode[j] | |
546b63fb RK |
5641 | = (reload_inmode[j] == VOIDmode |
5642 | || (GET_MODE_SIZE (reload_outmode[j]) | |
5643 | > GET_MODE_SIZE (reload_inmode[j]))) | |
5644 | ? reload_outmode[j] : reload_inmode[j]; | |
32131a9c RK |
5645 | |
5646 | reload_nregs[j] = CLASS_MAX_NREGS (reload_reg_class[j], reload_mode[j]); | |
5647 | ||
5648 | if (reload_nregs[j] > 1) | |
5649 | { | |
5650 | max_group_size = MAX (reload_nregs[j], max_group_size); | |
5651 | group_class = reg_class_superunion[(int)reload_reg_class[j]][(int)group_class]; | |
5652 | } | |
5653 | ||
5654 | /* If we have already decided to use a certain register, | |
5655 | don't use it in another way. */ | |
5656 | if (reload_reg_rtx[j]) | |
546b63fb | 5657 | mark_reload_reg_in_use (REGNO (reload_reg_rtx[j]), reload_opnum[j], |
32131a9c RK |
5658 | reload_when_needed[j], reload_mode[j]); |
5659 | } | |
5660 | ||
5661 | if (n_reloads > 1) | |
5662 | qsort (reload_order, n_reloads, sizeof (short), reload_reg_class_lower); | |
5663 | ||
4c9a05bc RK |
5664 | bcopy ((char *) reload_reg_rtx, (char *) save_reload_reg_rtx, |
5665 | sizeof reload_reg_rtx); | |
32131a9c | 5666 | bcopy (reload_inherited, save_reload_inherited, sizeof reload_inherited); |
4c9a05bc RK |
5667 | bcopy ((char *) reload_inheritance_insn, |
5668 | (char *) save_reload_inheritance_insn, | |
32131a9c | 5669 | sizeof reload_inheritance_insn); |
4c9a05bc | 5670 | bcopy ((char *) reload_override_in, (char *) save_reload_override_in, |
32131a9c | 5671 | sizeof reload_override_in); |
4c9a05bc | 5672 | bcopy ((char *) reload_spill_index, (char *) save_reload_spill_index, |
32131a9c RK |
5673 | sizeof reload_spill_index); |
5674 | COPY_HARD_REG_SET (save_reload_reg_used, reload_reg_used); | |
5675 | COPY_HARD_REG_SET (save_reload_reg_used_at_all, reload_reg_used_at_all); | |
32131a9c RK |
5676 | COPY_HARD_REG_SET (save_reload_reg_used_in_op_addr, |
5677 | reload_reg_used_in_op_addr); | |
893bc853 RK |
5678 | |
5679 | COPY_HARD_REG_SET (save_reload_reg_used_in_op_addr_reload, | |
5680 | reload_reg_used_in_op_addr_reload); | |
5681 | ||
546b63fb RK |
5682 | COPY_HARD_REG_SET (save_reload_reg_used_in_insn, |
5683 | reload_reg_used_in_insn); | |
5684 | COPY_HARD_REG_SET (save_reload_reg_used_in_other_addr, | |
5685 | reload_reg_used_in_other_addr); | |
5686 | ||
5687 | for (i = 0; i < reload_n_operands; i++) | |
5688 | { | |
5689 | COPY_HARD_REG_SET (save_reload_reg_used_in_output[i], | |
5690 | reload_reg_used_in_output[i]); | |
5691 | COPY_HARD_REG_SET (save_reload_reg_used_in_input[i], | |
5692 | reload_reg_used_in_input[i]); | |
5693 | COPY_HARD_REG_SET (save_reload_reg_used_in_input_addr[i], | |
5694 | reload_reg_used_in_input_addr[i]); | |
47c8cf91 ILT |
5695 | COPY_HARD_REG_SET (save_reload_reg_used_in_inpaddr_addr[i], |
5696 | reload_reg_used_in_inpaddr_addr[i]); | |
546b63fb RK |
5697 | COPY_HARD_REG_SET (save_reload_reg_used_in_output_addr[i], |
5698 | reload_reg_used_in_output_addr[i]); | |
47c8cf91 ILT |
5699 | COPY_HARD_REG_SET (save_reload_reg_used_in_outaddr_addr[i], |
5700 | reload_reg_used_in_outaddr_addr[i]); | |
546b63fb | 5701 | } |
32131a9c | 5702 | |
58b1581b RS |
5703 | /* If -O, try first with inheritance, then turning it off. |
5704 | If not -O, don't do inheritance. | |
5705 | Using inheritance when not optimizing leads to paradoxes | |
5706 | with fp on the 68k: fp numbers (not NaNs) fail to be equal to themselves | |
5707 | because one side of the comparison might be inherited. */ | |
32131a9c | 5708 | |
58b1581b | 5709 | for (inheritance = optimize > 0; inheritance >= 0; inheritance--) |
32131a9c RK |
5710 | { |
5711 | /* Process the reloads in order of preference just found. | |
5712 | Beyond this point, subregs can be found in reload_reg_rtx. | |
5713 | ||
5714 | This used to look for an existing reloaded home for all | |
5715 | of the reloads, and only then perform any new reloads. | |
5716 | But that could lose if the reloads were done out of reg-class order | |
5717 | because a later reload with a looser constraint might have an old | |
5718 | home in a register needed by an earlier reload with a tighter constraint. | |
5719 | ||
5720 | To solve this, we make two passes over the reloads, in the order | |
5721 | described above. In the first pass we try to inherit a reload | |
5722 | from a previous insn. If there is a later reload that needs a | |
5723 | class that is a proper subset of the class being processed, we must | |
5724 | also allocate a spill register during the first pass. | |
5725 | ||
5726 | Then make a second pass over the reloads to allocate any reloads | |
5727 | that haven't been given registers yet. */ | |
5728 | ||
be7ae2a4 RK |
5729 | CLEAR_HARD_REG_SET (reload_reg_used_for_inherit); |
5730 | ||
32131a9c RK |
5731 | for (j = 0; j < n_reloads; j++) |
5732 | { | |
5733 | register int r = reload_order[j]; | |
5734 | ||
5735 | /* Ignore reloads that got marked inoperative. */ | |
b080c137 RK |
5736 | if (reload_out[r] == 0 && reload_in[r] == 0 |
5737 | && ! reload_secondary_p[r]) | |
32131a9c RK |
5738 | continue; |
5739 | ||
b29514ee | 5740 | /* If find_reloads chose to use reload_in or reload_out as a reload |
b080c137 RK |
5741 | register, we don't need to chose one. Otherwise, try even if it |
5742 | found one since we might save an insn if we find the value lying | |
b29514ee R |
5743 | around. |
5744 | Try also when reload_in is a pseudo without a hard reg. */ | |
32131a9c RK |
5745 | if (reload_in[r] != 0 && reload_reg_rtx[r] != 0 |
5746 | && (rtx_equal_p (reload_in[r], reload_reg_rtx[r]) | |
b29514ee R |
5747 | || (rtx_equal_p (reload_out[r], reload_reg_rtx[r]) |
5748 | && GET_CODE (reload_in[r]) != MEM | |
5749 | && true_regnum (reload_in[r]) < FIRST_PSEUDO_REGISTER))) | |
32131a9c RK |
5750 | continue; |
5751 | ||
5752 | #if 0 /* No longer needed for correct operation. | |
5753 | It might give better code, or might not; worth an experiment? */ | |
5754 | /* If this is an optional reload, we can't inherit from earlier insns | |
5755 | until we are sure that any non-optional reloads have been allocated. | |
5756 | The following code takes advantage of the fact that optional reloads | |
5757 | are at the end of reload_order. */ | |
5758 | if (reload_optional[r] != 0) | |
5759 | for (i = 0; i < j; i++) | |
5760 | if ((reload_out[reload_order[i]] != 0 | |
5761 | || reload_in[reload_order[i]] != 0 | |
5762 | || reload_secondary_p[reload_order[i]]) | |
5763 | && ! reload_optional[reload_order[i]] | |
5764 | && reload_reg_rtx[reload_order[i]] == 0) | |
7609e720 | 5765 | allocate_reload_reg (chain, reload_order[i], 0, inheritance); |
32131a9c RK |
5766 | #endif |
5767 | ||
5768 | /* First see if this pseudo is already available as reloaded | |
5769 | for a previous insn. We cannot try to inherit for reloads | |
5770 | that are smaller than the maximum number of registers needed | |
5771 | for groups unless the register we would allocate cannot be used | |
5772 | for the groups. | |
5773 | ||
5774 | We could check here to see if this is a secondary reload for | |
5775 | an object that is already in a register of the desired class. | |
5776 | This would avoid the need for the secondary reload register. | |
5777 | But this is complex because we can't easily determine what | |
b080c137 RK |
5778 | objects might want to be loaded via this reload. So let a |
5779 | register be allocated here. In `emit_reload_insns' we suppress | |
5780 | one of the loads in the case described above. */ | |
32131a9c RK |
5781 | |
5782 | if (inheritance) | |
5783 | { | |
cb2afeb3 | 5784 | int word = 0; |
32131a9c | 5785 | register int regno = -1; |
db660765 | 5786 | enum machine_mode mode; |
32131a9c RK |
5787 | |
5788 | if (reload_in[r] == 0) | |
5789 | ; | |
5790 | else if (GET_CODE (reload_in[r]) == REG) | |
db660765 TW |
5791 | { |
5792 | regno = REGNO (reload_in[r]); | |
5793 | mode = GET_MODE (reload_in[r]); | |
5794 | } | |
32131a9c | 5795 | else if (GET_CODE (reload_in_reg[r]) == REG) |
db660765 TW |
5796 | { |
5797 | regno = REGNO (reload_in_reg[r]); | |
5798 | mode = GET_MODE (reload_in_reg[r]); | |
5799 | } | |
cb2afeb3 R |
5800 | else if (GET_CODE (reload_in_reg[r]) == SUBREG |
5801 | && GET_CODE (SUBREG_REG (reload_in_reg[r])) == REG) | |
b60a8416 | 5802 | { |
cb2afeb3 R |
5803 | word = SUBREG_WORD (reload_in_reg[r]); |
5804 | regno = REGNO (SUBREG_REG (reload_in_reg[r])); | |
5805 | if (regno < FIRST_PSEUDO_REGISTER) | |
5806 | regno += word; | |
5807 | mode = GET_MODE (reload_in_reg[r]); | |
5808 | } | |
5809 | #ifdef AUTO_INC_DEC | |
5810 | else if ((GET_CODE (reload_in_reg[r]) == PRE_INC | |
5811 | || GET_CODE (reload_in_reg[r]) == PRE_DEC | |
5812 | || GET_CODE (reload_in_reg[r]) == POST_INC | |
5813 | || GET_CODE (reload_in_reg[r]) == POST_DEC) | |
5814 | && GET_CODE (XEXP (reload_in_reg[r], 0)) == REG) | |
5815 | { | |
5816 | regno = REGNO (XEXP (reload_in_reg[r], 0)); | |
5817 | mode = GET_MODE (XEXP (reload_in_reg[r], 0)); | |
5818 | reload_out[r] = reload_in[r]; | |
b60a8416 | 5819 | } |
cb2afeb3 | 5820 | #endif |
32131a9c RK |
5821 | #if 0 |
5822 | /* This won't work, since REGNO can be a pseudo reg number. | |
5823 | Also, it takes much more hair to keep track of all the things | |
5824 | that can invalidate an inherited reload of part of a pseudoreg. */ | |
5825 | else if (GET_CODE (reload_in[r]) == SUBREG | |
5826 | && GET_CODE (SUBREG_REG (reload_in[r])) == REG) | |
5827 | regno = REGNO (SUBREG_REG (reload_in[r])) + SUBREG_WORD (reload_in[r]); | |
5828 | #endif | |
5829 | ||
5830 | if (regno >= 0 && reg_last_reload_reg[regno] != 0) | |
5831 | { | |
cb2afeb3 R |
5832 | enum reg_class class = reload_reg_class[r], last_class; |
5833 | rtx last_reg = reg_last_reload_reg[regno]; | |
5834 | ||
5835 | i = REGNO (last_reg) + word; | |
5836 | last_class = REGNO_REG_CLASS (i); | |
5837 | if ((GET_MODE_SIZE (GET_MODE (last_reg)) | |
5838 | >= GET_MODE_SIZE (mode) + word * UNITS_PER_WORD) | |
5839 | && reg_reloaded_contents[i] == regno | |
e6e52be0 | 5840 | && TEST_HARD_REG_BIT (reg_reloaded_valid, i) |
e6e52be0 | 5841 | && HARD_REGNO_MODE_OK (i, reload_mode[r]) |
cb2afeb3 R |
5842 | && (TEST_HARD_REG_BIT (reg_class_contents[(int) class], i) |
5843 | /* Even if we can't use this register as a reload | |
5844 | register, we might use it for reload_override_in, | |
5845 | if copying it to the desired class is cheap | |
5846 | enough. */ | |
5847 | || ((REGISTER_MOVE_COST (last_class, class) | |
5848 | < MEMORY_MOVE_COST (mode, class, 1)) | |
5849 | #ifdef SECONDARY_INPUT_RELOAD_CLASS | |
5850 | && (SECONDARY_INPUT_RELOAD_CLASS (class, mode, | |
5851 | last_reg) | |
5852 | == NO_REGS) | |
5853 | #endif | |
5854 | #ifdef SECONDARY_MEMORY_NEEDED | |
5855 | && ! SECONDARY_MEMORY_NEEDED (last_class, class, | |
5856 | mode) | |
5857 | #endif | |
5858 | )) | |
5859 | ||
32131a9c RK |
5860 | && (reload_nregs[r] == max_group_size |
5861 | || ! TEST_HARD_REG_BIT (reg_class_contents[(int) group_class], | |
e6e52be0 | 5862 | i)) |
6e684430 R |
5863 | && ((reload_reg_free_p (i, reload_opnum[r], |
5864 | reload_when_needed[r]) | |
5865 | && reload_reg_free_before_p (i, reload_opnum[r], | |
6f77675f R |
5866 | reload_when_needed[r], |
5867 | 0)) | |
6e684430 R |
5868 | || reload_reg_free_for_value_p (i, reload_opnum[r], |
5869 | reload_when_needed[r], | |
f5470689 R |
5870 | reload_in[r], |
5871 | reload_out[r], r))) | |
32131a9c RK |
5872 | { |
5873 | /* If a group is needed, verify that all the subsequent | |
0f41302f | 5874 | registers still have their values intact. */ |
32131a9c | 5875 | int nr |
e6e52be0 | 5876 | = HARD_REGNO_NREGS (i, reload_mode[r]); |
32131a9c RK |
5877 | int k; |
5878 | ||
5879 | for (k = 1; k < nr; k++) | |
e6e52be0 R |
5880 | if (reg_reloaded_contents[i + k] != regno |
5881 | || ! TEST_HARD_REG_BIT (reg_reloaded_valid, i + k)) | |
32131a9c RK |
5882 | break; |
5883 | ||
5884 | if (k == nr) | |
5885 | { | |
c74fa651 RS |
5886 | int i1; |
5887 | ||
cb2afeb3 R |
5888 | last_reg = (GET_MODE (last_reg) == mode |
5889 | ? last_reg : gen_rtx_REG (mode, i)); | |
5890 | ||
c74fa651 RS |
5891 | /* We found a register that contains the |
5892 | value we need. If this register is the | |
5893 | same as an `earlyclobber' operand of the | |
5894 | current insn, just mark it as a place to | |
5895 | reload from since we can't use it as the | |
5896 | reload register itself. */ | |
5897 | ||
5898 | for (i1 = 0; i1 < n_earlyclobbers; i1++) | |
5899 | if (reg_overlap_mentioned_for_reload_p | |
5900 | (reg_last_reload_reg[regno], | |
5901 | reload_earlyclobbers[i1])) | |
5902 | break; | |
5903 | ||
8908158d | 5904 | if (i1 != n_earlyclobbers |
e6e52be0 | 5905 | /* Don't use it if we'd clobber a pseudo reg. */ |
297927a8 | 5906 | || (! TEST_HARD_REG_BIT (reg_used_by_pseudo, i) |
e6e52be0 R |
5907 | && reload_out[r] |
5908 | && ! TEST_HARD_REG_BIT (reg_reloaded_dead, i)) | |
8908158d RS |
5909 | /* Don't really use the inherited spill reg |
5910 | if we need it wider than we've got it. */ | |
5911 | || (GET_MODE_SIZE (reload_mode[r]) | |
b29514ee | 5912 | > GET_MODE_SIZE (mode)) |
cb2afeb3 R |
5913 | || ! TEST_HARD_REG_BIT (reg_class_contents[(int) reload_reg_class[r]], |
5914 | i) | |
5915 | ||
b29514ee R |
5916 | /* If find_reloads chose reload_out as reload |
5917 | register, stay with it - that leaves the | |
5918 | inherited register for subsequent reloads. */ | |
297927a8 | 5919 | || (reload_out[r] && reload_reg_rtx[r] |
b29514ee R |
5920 | && rtx_equal_p (reload_out[r], |
5921 | reload_reg_rtx[r]))) | |
cb2afeb3 R |
5922 | { |
5923 | reload_override_in[r] = last_reg; | |
5924 | reload_inheritance_insn[r] | |
5925 | = reg_reloaded_insn[i]; | |
5926 | } | |
c74fa651 RS |
5927 | else |
5928 | { | |
54c40e68 | 5929 | int k; |
c74fa651 RS |
5930 | /* We can use this as a reload reg. */ |
5931 | /* Mark the register as in use for this part of | |
5932 | the insn. */ | |
e6e52be0 | 5933 | mark_reload_reg_in_use (i, |
c74fa651 RS |
5934 | reload_opnum[r], |
5935 | reload_when_needed[r], | |
5936 | reload_mode[r]); | |
cb2afeb3 | 5937 | reload_reg_rtx[r] = last_reg; |
c74fa651 RS |
5938 | reload_inherited[r] = 1; |
5939 | reload_inheritance_insn[r] | |
5940 | = reg_reloaded_insn[i]; | |
5941 | reload_spill_index[r] = i; | |
54c40e68 RS |
5942 | for (k = 0; k < nr; k++) |
5943 | SET_HARD_REG_BIT (reload_reg_used_for_inherit, | |
e6e52be0 | 5944 | i + k); |
c74fa651 | 5945 | } |
32131a9c RK |
5946 | } |
5947 | } | |
5948 | } | |
5949 | } | |
5950 | ||
5951 | /* Here's another way to see if the value is already lying around. */ | |
5952 | if (inheritance | |
5953 | && reload_in[r] != 0 | |
5954 | && ! reload_inherited[r] | |
5955 | && reload_out[r] == 0 | |
5956 | && (CONSTANT_P (reload_in[r]) | |
5957 | || GET_CODE (reload_in[r]) == PLUS | |
5958 | || GET_CODE (reload_in[r]) == REG | |
5959 | || GET_CODE (reload_in[r]) == MEM) | |
5960 | && (reload_nregs[r] == max_group_size | |
5961 | || ! reg_classes_intersect_p (reload_reg_class[r], group_class))) | |
5962 | { | |
5963 | register rtx equiv | |
5964 | = find_equiv_reg (reload_in[r], insn, reload_reg_class[r], | |
fb3821f7 | 5965 | -1, NULL_PTR, 0, reload_mode[r]); |
32131a9c RK |
5966 | int regno; |
5967 | ||
5968 | if (equiv != 0) | |
5969 | { | |
5970 | if (GET_CODE (equiv) == REG) | |
5971 | regno = REGNO (equiv); | |
5972 | else if (GET_CODE (equiv) == SUBREG) | |
5973 | { | |
f8a9e02b RK |
5974 | /* This must be a SUBREG of a hard register. |
5975 | Make a new REG since this might be used in an | |
5976 | address and not all machines support SUBREGs | |
5977 | there. */ | |
5978 | regno = REGNO (SUBREG_REG (equiv)) + SUBREG_WORD (equiv); | |
38a448ca | 5979 | equiv = gen_rtx_REG (reload_mode[r], regno); |
32131a9c RK |
5980 | } |
5981 | else | |
5982 | abort (); | |
5983 | } | |
5984 | ||
5985 | /* If we found a spill reg, reject it unless it is free | |
5986 | and of the desired class. */ | |
5987 | if (equiv != 0 | |
cb2afeb3 R |
5988 | && ((TEST_HARD_REG_BIT (reload_reg_used_at_all, regno) |
5989 | && ! reload_reg_free_for_value_p (regno, reload_opnum[r], | |
5990 | reload_when_needed[r], | |
5991 | reload_in[r], | |
5992 | reload_out[r], r)) | |
32131a9c RK |
5993 | || ! TEST_HARD_REG_BIT (reg_class_contents[(int) reload_reg_class[r]], |
5994 | regno))) | |
5995 | equiv = 0; | |
5996 | ||
32131a9c RK |
5997 | if (equiv != 0 && ! HARD_REGNO_MODE_OK (regno, reload_mode[r])) |
5998 | equiv = 0; | |
5999 | ||
6000 | /* We found a register that contains the value we need. | |
6001 | If this register is the same as an `earlyclobber' operand | |
6002 | of the current insn, just mark it as a place to reload from | |
6003 | since we can't use it as the reload register itself. */ | |
6004 | ||
6005 | if (equiv != 0) | |
6006 | for (i = 0; i < n_earlyclobbers; i++) | |
bfa30b22 RK |
6007 | if (reg_overlap_mentioned_for_reload_p (equiv, |
6008 | reload_earlyclobbers[i])) | |
32131a9c RK |
6009 | { |
6010 | reload_override_in[r] = equiv; | |
6011 | equiv = 0; | |
6012 | break; | |
6013 | } | |
6014 | ||
3c785e47 R |
6015 | /* If the equiv register we have found is explicitly clobbered |
6016 | in the current insn, it depends on the reload type if we | |
6017 | can use it, use it for reload_override_in, or not at all. | |
6018 | In particular, we then can't use EQUIV for a | |
6019 | RELOAD_FOR_OUTPUT_ADDRESS reload. */ | |
32131a9c RK |
6020 | |
6021 | if (equiv != 0 && regno_clobbered_p (regno, insn)) | |
6022 | { | |
3c785e47 R |
6023 | switch (reload_when_needed[r]) |
6024 | { | |
6025 | case RELOAD_FOR_OTHER_ADDRESS: | |
6026 | case RELOAD_FOR_INPADDR_ADDRESS: | |
6027 | case RELOAD_FOR_INPUT_ADDRESS: | |
6028 | case RELOAD_FOR_OPADDR_ADDR: | |
6029 | break; | |
6030 | case RELOAD_OTHER: | |
6031 | case RELOAD_FOR_INPUT: | |
6032 | case RELOAD_FOR_OPERAND_ADDRESS: | |
6033 | reload_override_in[r] = equiv; | |
6034 | /* Fall through. */ | |
6035 | default: | |
6036 | equiv = 0; | |
6037 | break; | |
6038 | } | |
32131a9c RK |
6039 | } |
6040 | ||
6041 | /* If we found an equivalent reg, say no code need be generated | |
6042 | to load it, and use it as our reload reg. */ | |
3ec2ea3e | 6043 | if (equiv != 0 && regno != HARD_FRAME_POINTER_REGNUM) |
32131a9c | 6044 | { |
100338df JL |
6045 | int nr = HARD_REGNO_NREGS (regno, reload_mode[r]); |
6046 | int k; | |
32131a9c RK |
6047 | reload_reg_rtx[r] = equiv; |
6048 | reload_inherited[r] = 1; | |
100338df | 6049 | |
91d7e7ac R |
6050 | /* If reg_reloaded_valid is not set for this register, |
6051 | there might be a stale spill_reg_store lying around. | |
6052 | We must clear it, since otherwise emit_reload_insns | |
6053 | might delete the store. */ | |
6054 | if (! TEST_HARD_REG_BIT (reg_reloaded_valid, regno)) | |
6055 | spill_reg_store[regno] = NULL_RTX; | |
100338df JL |
6056 | /* If any of the hard registers in EQUIV are spill |
6057 | registers, mark them as in use for this insn. */ | |
6058 | for (k = 0; k < nr; k++) | |
be7ae2a4 | 6059 | { |
100338df JL |
6060 | i = spill_reg_order[regno + k]; |
6061 | if (i >= 0) | |
6062 | { | |
6063 | mark_reload_reg_in_use (regno, reload_opnum[r], | |
6064 | reload_when_needed[r], | |
6065 | reload_mode[r]); | |
6066 | SET_HARD_REG_BIT (reload_reg_used_for_inherit, | |
6067 | regno + k); | |
6068 | } | |
be7ae2a4 | 6069 | } |
32131a9c RK |
6070 | } |
6071 | } | |
6072 | ||
6073 | /* If we found a register to use already, or if this is an optional | |
6074 | reload, we are done. */ | |
6075 | if (reload_reg_rtx[r] != 0 || reload_optional[r] != 0) | |
6076 | continue; | |
6077 | ||
6078 | #if 0 /* No longer needed for correct operation. Might or might not | |
6079 | give better code on the average. Want to experiment? */ | |
6080 | ||
6081 | /* See if there is a later reload that has a class different from our | |
6082 | class that intersects our class or that requires less register | |
6083 | than our reload. If so, we must allocate a register to this | |
6084 | reload now, since that reload might inherit a previous reload | |
6085 | and take the only available register in our class. Don't do this | |
6086 | for optional reloads since they will force all previous reloads | |
6087 | to be allocated. Also don't do this for reloads that have been | |
6088 | turned off. */ | |
6089 | ||
6090 | for (i = j + 1; i < n_reloads; i++) | |
6091 | { | |
6092 | int s = reload_order[i]; | |
6093 | ||
d45cf215 RS |
6094 | if ((reload_in[s] == 0 && reload_out[s] == 0 |
6095 | && ! reload_secondary_p[s]) | |
32131a9c RK |
6096 | || reload_optional[s]) |
6097 | continue; | |
6098 | ||
6099 | if ((reload_reg_class[s] != reload_reg_class[r] | |
6100 | && reg_classes_intersect_p (reload_reg_class[r], | |
6101 | reload_reg_class[s])) | |
6102 | || reload_nregs[s] < reload_nregs[r]) | |
6103 | break; | |
6104 | } | |
6105 | ||
6106 | if (i == n_reloads) | |
6107 | continue; | |
6108 | ||
7609e720 | 6109 | allocate_reload_reg (chain, r, j == n_reloads - 1, inheritance); |
32131a9c RK |
6110 | #endif |
6111 | } | |
6112 | ||
6113 | /* Now allocate reload registers for anything non-optional that | |
6114 | didn't get one yet. */ | |
6115 | for (j = 0; j < n_reloads; j++) | |
6116 | { | |
6117 | register int r = reload_order[j]; | |
6118 | ||
6119 | /* Ignore reloads that got marked inoperative. */ | |
6120 | if (reload_out[r] == 0 && reload_in[r] == 0 && ! reload_secondary_p[r]) | |
6121 | continue; | |
6122 | ||
6123 | /* Skip reloads that already have a register allocated or are | |
0f41302f | 6124 | optional. */ |
32131a9c RK |
6125 | if (reload_reg_rtx[r] != 0 || reload_optional[r]) |
6126 | continue; | |
6127 | ||
7609e720 | 6128 | if (! allocate_reload_reg (chain, r, j == n_reloads - 1, inheritance)) |
32131a9c RK |
6129 | break; |
6130 | } | |
6131 | ||
6132 | /* If that loop got all the way, we have won. */ | |
6133 | if (j == n_reloads) | |
6134 | break; | |
6135 | ||
32131a9c RK |
6136 | /* Loop around and try without any inheritance. */ |
6137 | /* First undo everything done by the failed attempt | |
6138 | to allocate with inheritance. */ | |
4c9a05bc RK |
6139 | bcopy ((char *) save_reload_reg_rtx, (char *) reload_reg_rtx, |
6140 | sizeof reload_reg_rtx); | |
6141 | bcopy ((char *) save_reload_inherited, (char *) reload_inherited, | |
6142 | sizeof reload_inherited); | |
6143 | bcopy ((char *) save_reload_inheritance_insn, | |
6144 | (char *) reload_inheritance_insn, | |
32131a9c | 6145 | sizeof reload_inheritance_insn); |
4c9a05bc | 6146 | bcopy ((char *) save_reload_override_in, (char *) reload_override_in, |
32131a9c | 6147 | sizeof reload_override_in); |
4c9a05bc | 6148 | bcopy ((char *) save_reload_spill_index, (char *) reload_spill_index, |
32131a9c RK |
6149 | sizeof reload_spill_index); |
6150 | COPY_HARD_REG_SET (reload_reg_used, save_reload_reg_used); | |
6151 | COPY_HARD_REG_SET (reload_reg_used_at_all, save_reload_reg_used_at_all); | |
32131a9c RK |
6152 | COPY_HARD_REG_SET (reload_reg_used_in_op_addr, |
6153 | save_reload_reg_used_in_op_addr); | |
893bc853 RK |
6154 | COPY_HARD_REG_SET (reload_reg_used_in_op_addr_reload, |
6155 | save_reload_reg_used_in_op_addr_reload); | |
546b63fb RK |
6156 | COPY_HARD_REG_SET (reload_reg_used_in_insn, |
6157 | save_reload_reg_used_in_insn); | |
6158 | COPY_HARD_REG_SET (reload_reg_used_in_other_addr, | |
6159 | save_reload_reg_used_in_other_addr); | |
6160 | ||
6161 | for (i = 0; i < reload_n_operands; i++) | |
6162 | { | |
6163 | COPY_HARD_REG_SET (reload_reg_used_in_input[i], | |
6164 | save_reload_reg_used_in_input[i]); | |
6165 | COPY_HARD_REG_SET (reload_reg_used_in_output[i], | |
6166 | save_reload_reg_used_in_output[i]); | |
6167 | COPY_HARD_REG_SET (reload_reg_used_in_input_addr[i], | |
6168 | save_reload_reg_used_in_input_addr[i]); | |
47c8cf91 ILT |
6169 | COPY_HARD_REG_SET (reload_reg_used_in_inpaddr_addr[i], |
6170 | save_reload_reg_used_in_inpaddr_addr[i]); | |
546b63fb RK |
6171 | COPY_HARD_REG_SET (reload_reg_used_in_output_addr[i], |
6172 | save_reload_reg_used_in_output_addr[i]); | |
47c8cf91 ILT |
6173 | COPY_HARD_REG_SET (reload_reg_used_in_outaddr_addr[i], |
6174 | save_reload_reg_used_in_outaddr_addr[i]); | |
546b63fb | 6175 | } |
32131a9c RK |
6176 | } |
6177 | ||
6178 | /* If we thought we could inherit a reload, because it seemed that | |
6179 | nothing else wanted the same reload register earlier in the insn, | |
cb2afeb3 R |
6180 | verify that assumption, now that all reloads have been assigned. |
6181 | Likewise for reloads where reload_override_in has been set. */ | |
32131a9c | 6182 | |
cb2afeb3 R |
6183 | /* If doing expensive optimizations, do one preliminary pass that doesn't |
6184 | cancel any inheritance, but removes reloads that have been needed only | |
6185 | for reloads that we know can be inherited. */ | |
6186 | for (pass = flag_expensive_optimizations; pass >= 0; pass--) | |
32131a9c | 6187 | { |
cb2afeb3 | 6188 | for (j = 0; j < n_reloads; j++) |
029b38ff | 6189 | { |
cb2afeb3 R |
6190 | register int r = reload_order[j]; |
6191 | rtx check_reg; | |
cb2afeb3 R |
6192 | if (reload_inherited[r] && reload_reg_rtx[r]) |
6193 | check_reg = reload_reg_rtx[r]; | |
6194 | else if (reload_override_in[r] | |
6195 | && (GET_CODE (reload_override_in[r]) == REG | |
6196 | || GET_CODE (reload_override_in[r]) == SUBREG)) | |
6197 | check_reg = reload_override_in[r]; | |
6198 | else | |
6199 | continue; | |
6200 | if (! (reload_reg_free_before_p (true_regnum (check_reg), | |
6201 | reload_opnum[r], reload_when_needed[r], | |
6202 | ! reload_inherited[r]) | |
6203 | || reload_reg_free_for_value_p (true_regnum (check_reg), | |
6204 | reload_opnum[r], | |
6205 | reload_when_needed[r], | |
6206 | reload_in[r], | |
6207 | reload_out[r], r))) | |
029b38ff | 6208 | { |
cb2afeb3 R |
6209 | if (pass) |
6210 | continue; | |
6211 | reload_inherited[r] = 0; | |
6212 | reload_override_in[r] = 0; | |
029b38ff | 6213 | } |
cb2afeb3 R |
6214 | /* If we can inherit a RELOAD_FOR_INPUT, or can use a |
6215 | reload_override_in, then we do not need its related | |
6216 | RELOAD_FOR_INPUT_ADDRESS / RELOAD_FOR_INPADDR_ADDRESS reloads; | |
6217 | likewise for other reload types. | |
6218 | We handle this by removing a reload when its only replacement | |
6219 | is mentioned in reload_in of the reload we are going to inherit. | |
6220 | A special case are auto_inc expressions; even if the input is | |
6221 | inherited, we still need the address for the output. We can | |
6222 | recognize them because they have RELOAD_OUT set but not | |
6223 | RELOAD_OUT_REG. | |
6224 | If we suceeded removing some reload and we are doing a preliminary | |
6225 | pass just to remove such reloads, make another pass, since the | |
6226 | removal of one reload might allow us to inherit another one. */ | |
6227 | else if ((! reload_out[r] || reload_out_reg[r]) | |
6228 | && remove_address_replacements (reload_in[r]) && pass) | |
6229 | pass = 2; | |
32131a9c RK |
6230 | } |
6231 | } | |
6232 | ||
6233 | /* Now that reload_override_in is known valid, | |
6234 | actually override reload_in. */ | |
6235 | for (j = 0; j < n_reloads; j++) | |
6236 | if (reload_override_in[j]) | |
6237 | reload_in[j] = reload_override_in[j]; | |
6238 | ||
6239 | /* If this reload won't be done because it has been cancelled or is | |
6240 | optional and not inherited, clear reload_reg_rtx so other | |
6241 | routines (such as subst_reloads) don't get confused. */ | |
6242 | for (j = 0; j < n_reloads; j++) | |
be7ae2a4 RK |
6243 | if (reload_reg_rtx[j] != 0 |
6244 | && ((reload_optional[j] && ! reload_inherited[j]) | |
6245 | || (reload_in[j] == 0 && reload_out[j] == 0 | |
6246 | && ! reload_secondary_p[j]))) | |
6247 | { | |
6248 | int regno = true_regnum (reload_reg_rtx[j]); | |
6249 | ||
6250 | if (spill_reg_order[regno] >= 0) | |
6251 | clear_reload_reg_in_use (regno, reload_opnum[j], | |
6252 | reload_when_needed[j], reload_mode[j]); | |
6253 | reload_reg_rtx[j] = 0; | |
6254 | } | |
32131a9c RK |
6255 | |
6256 | /* Record which pseudos and which spill regs have output reloads. */ | |
6257 | for (j = 0; j < n_reloads; j++) | |
6258 | { | |
6259 | register int r = reload_order[j]; | |
6260 | ||
6261 | i = reload_spill_index[r]; | |
6262 | ||
e6e52be0 | 6263 | /* I is nonneg if this reload uses a register. |
32131a9c RK |
6264 | If reload_reg_rtx[r] is 0, this is an optional reload |
6265 | that we opted to ignore. */ | |
cb2afeb3 | 6266 | if (reload_out_reg[r] != 0 && GET_CODE (reload_out_reg[r]) == REG |
32131a9c RK |
6267 | && reload_reg_rtx[r] != 0) |
6268 | { | |
cb2afeb3 | 6269 | register int nregno = REGNO (reload_out_reg[r]); |
372e033b RS |
6270 | int nr = 1; |
6271 | ||
6272 | if (nregno < FIRST_PSEUDO_REGISTER) | |
6273 | nr = HARD_REGNO_NREGS (nregno, reload_mode[r]); | |
32131a9c RK |
6274 | |
6275 | while (--nr >= 0) | |
372e033b RS |
6276 | reg_has_output_reload[nregno + nr] = 1; |
6277 | ||
6278 | if (i >= 0) | |
32131a9c | 6279 | { |
e6e52be0 | 6280 | nr = HARD_REGNO_NREGS (i, reload_mode[r]); |
372e033b | 6281 | while (--nr >= 0) |
e6e52be0 | 6282 | SET_HARD_REG_BIT (reg_is_output_reload, i + nr); |
32131a9c RK |
6283 | } |
6284 | ||
6285 | if (reload_when_needed[r] != RELOAD_OTHER | |
546b63fb RK |
6286 | && reload_when_needed[r] != RELOAD_FOR_OUTPUT |
6287 | && reload_when_needed[r] != RELOAD_FOR_INSN) | |
32131a9c RK |
6288 | abort (); |
6289 | } | |
6290 | } | |
6291 | } | |
cb2afeb3 R |
6292 | |
6293 | /* Deallocate the reload register for reload R. This is called from | |
6294 | remove_address_replacements. */ | |
6295 | void | |
6296 | deallocate_reload_reg (r) | |
6297 | int r; | |
6298 | { | |
6299 | int regno; | |
6300 | ||
6301 | if (! reload_reg_rtx[r]) | |
6302 | return; | |
6303 | regno = true_regnum (reload_reg_rtx[r]); | |
6304 | reload_reg_rtx[r] = 0; | |
6305 | if (spill_reg_order[regno] >= 0) | |
6306 | clear_reload_reg_in_use (regno, reload_opnum[r], reload_when_needed[r], | |
6307 | reload_mode[r]); | |
6308 | reload_spill_index[r] = -1; | |
6309 | } | |
32131a9c | 6310 | \f |
e9a25f70 | 6311 | /* If SMALL_REGISTER_CLASSES is non-zero, we may not have merged two |
546b63fb RK |
6312 | reloads of the same item for fear that we might not have enough reload |
6313 | registers. However, normally they will get the same reload register | |
6314 | and hence actually need not be loaded twice. | |
6315 | ||
6316 | Here we check for the most common case of this phenomenon: when we have | |
6317 | a number of reloads for the same object, each of which were allocated | |
6318 | the same reload_reg_rtx, that reload_reg_rtx is not used for any other | |
6319 | reload, and is not modified in the insn itself. If we find such, | |
6320 | merge all the reloads and set the resulting reload to RELOAD_OTHER. | |
6321 | This will not increase the number of spill registers needed and will | |
6322 | prevent redundant code. */ | |
6323 | ||
546b63fb RK |
6324 | static void |
6325 | merge_assigned_reloads (insn) | |
6326 | rtx insn; | |
6327 | { | |
6328 | int i, j; | |
6329 | ||
6330 | /* Scan all the reloads looking for ones that only load values and | |
6331 | are not already RELOAD_OTHER and ones whose reload_reg_rtx are | |
6332 | assigned and not modified by INSN. */ | |
6333 | ||
6334 | for (i = 0; i < n_reloads; i++) | |
6335 | { | |
d668e863 R |
6336 | int conflicting_input = 0; |
6337 | int max_input_address_opnum = -1; | |
6338 | int min_conflicting_input_opnum = MAX_RECOG_OPERANDS; | |
6339 | ||
546b63fb RK |
6340 | if (reload_in[i] == 0 || reload_when_needed[i] == RELOAD_OTHER |
6341 | || reload_out[i] != 0 || reload_reg_rtx[i] == 0 | |
6342 | || reg_set_p (reload_reg_rtx[i], insn)) | |
6343 | continue; | |
6344 | ||
6345 | /* Look at all other reloads. Ensure that the only use of this | |
6346 | reload_reg_rtx is in a reload that just loads the same value | |
6347 | as we do. Note that any secondary reloads must be of the identical | |
6348 | class since the values, modes, and result registers are the | |
6349 | same, so we need not do anything with any secondary reloads. */ | |
6350 | ||
6351 | for (j = 0; j < n_reloads; j++) | |
6352 | { | |
6353 | if (i == j || reload_reg_rtx[j] == 0 | |
6354 | || ! reg_overlap_mentioned_p (reload_reg_rtx[j], | |
6355 | reload_reg_rtx[i])) | |
6356 | continue; | |
6357 | ||
d668e863 R |
6358 | if (reload_when_needed[j] == RELOAD_FOR_INPUT_ADDRESS |
6359 | && reload_opnum[j] > max_input_address_opnum) | |
6360 | max_input_address_opnum = reload_opnum[j]; | |
6361 | ||
546b63fb | 6362 | /* If the reload regs aren't exactly the same (e.g, different modes) |
d668e863 R |
6363 | or if the values are different, we can't merge this reload. |
6364 | But if it is an input reload, we might still merge | |
6365 | RELOAD_FOR_INPUT_ADDRESS and RELOAD_FOR_OTHER_ADDRESS reloads. */ | |
546b63fb RK |
6366 | |
6367 | if (! rtx_equal_p (reload_reg_rtx[i], reload_reg_rtx[j]) | |
6368 | || reload_out[j] != 0 || reload_in[j] == 0 | |
6369 | || ! rtx_equal_p (reload_in[i], reload_in[j])) | |
d668e863 R |
6370 | { |
6371 | if (reload_when_needed[j] != RELOAD_FOR_INPUT | |
6372 | || ((reload_when_needed[i] != RELOAD_FOR_INPUT_ADDRESS | |
6373 | || reload_opnum[i] > reload_opnum[j]) | |
6374 | && reload_when_needed[i] != RELOAD_FOR_OTHER_ADDRESS)) | |
6375 | break; | |
6376 | conflicting_input = 1; | |
6377 | if (min_conflicting_input_opnum > reload_opnum[j]) | |
6378 | min_conflicting_input_opnum = reload_opnum[j]; | |
6379 | } | |
546b63fb RK |
6380 | } |
6381 | ||
6382 | /* If all is OK, merge the reloads. Only set this to RELOAD_OTHER if | |
6383 | we, in fact, found any matching reloads. */ | |
6384 | ||
d668e863 R |
6385 | if (j == n_reloads |
6386 | && max_input_address_opnum <= min_conflicting_input_opnum) | |
546b63fb RK |
6387 | { |
6388 | for (j = 0; j < n_reloads; j++) | |
6389 | if (i != j && reload_reg_rtx[j] != 0 | |
d668e863 R |
6390 | && rtx_equal_p (reload_reg_rtx[i], reload_reg_rtx[j]) |
6391 | && (! conflicting_input | |
6392 | || reload_when_needed[j] == RELOAD_FOR_INPUT_ADDRESS | |
6393 | || reload_when_needed[j] == RELOAD_FOR_OTHER_ADDRESS)) | |
546b63fb RK |
6394 | { |
6395 | reload_when_needed[i] = RELOAD_OTHER; | |
6396 | reload_in[j] = 0; | |
efdb3590 | 6397 | reload_spill_index[j] = -1; |
546b63fb RK |
6398 | transfer_replacements (i, j); |
6399 | } | |
6400 | ||
6401 | /* If this is now RELOAD_OTHER, look for any reloads that load | |
6402 | parts of this operand and set them to RELOAD_FOR_OTHER_ADDRESS | |
6403 | if they were for inputs, RELOAD_OTHER for outputs. Note that | |
6404 | this test is equivalent to looking for reloads for this operand | |
6405 | number. */ | |
6406 | ||
6407 | if (reload_when_needed[i] == RELOAD_OTHER) | |
6408 | for (j = 0; j < n_reloads; j++) | |
6409 | if (reload_in[j] != 0 | |
6410 | && reload_when_needed[i] != RELOAD_OTHER | |
6411 | && reg_overlap_mentioned_for_reload_p (reload_in[j], | |
6412 | reload_in[i])) | |
6413 | reload_when_needed[j] | |
47c8cf91 ILT |
6414 | = ((reload_when_needed[i] == RELOAD_FOR_INPUT_ADDRESS |
6415 | || reload_when_needed[i] == RELOAD_FOR_INPADDR_ADDRESS) | |
6416 | ? RELOAD_FOR_OTHER_ADDRESS : RELOAD_OTHER); | |
546b63fb RK |
6417 | } |
6418 | } | |
6419 | } | |
e9a25f70 | 6420 | |
546b63fb | 6421 | \f |
32131a9c RK |
6422 | /* Output insns to reload values in and out of the chosen reload regs. */ |
6423 | ||
6424 | static void | |
7609e720 BS |
6425 | emit_reload_insns (chain) |
6426 | struct insn_chain *chain; | |
32131a9c | 6427 | { |
7609e720 BS |
6428 | rtx insn = chain->insn; |
6429 | ||
32131a9c | 6430 | register int j; |
546b63fb RK |
6431 | rtx input_reload_insns[MAX_RECOG_OPERANDS]; |
6432 | rtx other_input_address_reload_insns = 0; | |
6433 | rtx other_input_reload_insns = 0; | |
6434 | rtx input_address_reload_insns[MAX_RECOG_OPERANDS]; | |
47c8cf91 | 6435 | rtx inpaddr_address_reload_insns[MAX_RECOG_OPERANDS]; |
546b63fb RK |
6436 | rtx output_reload_insns[MAX_RECOG_OPERANDS]; |
6437 | rtx output_address_reload_insns[MAX_RECOG_OPERANDS]; | |
47c8cf91 | 6438 | rtx outaddr_address_reload_insns[MAX_RECOG_OPERANDS]; |
546b63fb | 6439 | rtx operand_reload_insns = 0; |
893bc853 | 6440 | rtx other_operand_reload_insns = 0; |
befa01b9 | 6441 | rtx other_output_reload_insns[MAX_RECOG_OPERANDS]; |
32131a9c | 6442 | rtx following_insn = NEXT_INSN (insn); |
c93b03c2 | 6443 | rtx before_insn = PREV_INSN (insn); |
32131a9c RK |
6444 | int special; |
6445 | /* Values to be put in spill_reg_store are put here first. */ | |
6446 | rtx new_spill_reg_store[FIRST_PSEUDO_REGISTER]; | |
e6e52be0 R |
6447 | HARD_REG_SET reg_reloaded_died; |
6448 | ||
6449 | CLEAR_HARD_REG_SET (reg_reloaded_died); | |
32131a9c | 6450 | |
546b63fb RK |
6451 | for (j = 0; j < reload_n_operands; j++) |
6452 | input_reload_insns[j] = input_address_reload_insns[j] | |
47c8cf91 | 6453 | = inpaddr_address_reload_insns[j] |
befa01b9 | 6454 | = output_reload_insns[j] = output_address_reload_insns[j] |
47c8cf91 | 6455 | = outaddr_address_reload_insns[j] |
befa01b9 | 6456 | = other_output_reload_insns[j] = 0; |
546b63fb | 6457 | |
32131a9c RK |
6458 | /* Now output the instructions to copy the data into and out of the |
6459 | reload registers. Do these in the order that the reloads were reported, | |
6460 | since reloads of base and index registers precede reloads of operands | |
6461 | and the operands may need the base and index registers reloaded. */ | |
6462 | ||
6463 | for (j = 0; j < n_reloads; j++) | |
6464 | { | |
6465 | register rtx old; | |
6466 | rtx oldequiv_reg = 0; | |
80d92002 | 6467 | rtx this_reload_insn = 0; |
b60a8416 | 6468 | int expect_occurrences = 1; |
73b2ad9e | 6469 | |
cb2afeb3 R |
6470 | if (reload_reg_rtx[j] |
6471 | && REGNO (reload_reg_rtx[j]) < FIRST_PSEUDO_REGISTER) | |
6472 | new_spill_reg_store[REGNO (reload_reg_rtx[j])] = 0; | |
32131a9c | 6473 | |
cb2afeb3 R |
6474 | old = (reload_in[j] && GET_CODE (reload_in[j]) == MEM |
6475 | ? reload_in_reg[j] : reload_in[j]); | |
6476 | ||
6477 | if (old != 0 | |
6478 | /* AUTO_INC reloads need to be handled even if inherited. We got an | |
6479 | AUTO_INC reload if reload_out is set but reload_out_reg isn't. */ | |
6480 | && (! reload_inherited[j] || (reload_out[j] && ! reload_out_reg[j])) | |
32131a9c RK |
6481 | && ! rtx_equal_p (reload_reg_rtx[j], old) |
6482 | && reload_reg_rtx[j] != 0) | |
6483 | { | |
6484 | register rtx reloadreg = reload_reg_rtx[j]; | |
6485 | rtx oldequiv = 0; | |
6486 | enum machine_mode mode; | |
546b63fb | 6487 | rtx *where; |
32131a9c RK |
6488 | |
6489 | /* Determine the mode to reload in. | |
6490 | This is very tricky because we have three to choose from. | |
6491 | There is the mode the insn operand wants (reload_inmode[J]). | |
6492 | There is the mode of the reload register RELOADREG. | |
6493 | There is the intrinsic mode of the operand, which we could find | |
6494 | by stripping some SUBREGs. | |
6495 | It turns out that RELOADREG's mode is irrelevant: | |
6496 | we can change that arbitrarily. | |
6497 | ||
6498 | Consider (SUBREG:SI foo:QI) as an operand that must be SImode; | |
6499 | then the reload reg may not support QImode moves, so use SImode. | |
6500 | If foo is in memory due to spilling a pseudo reg, this is safe, | |
6501 | because the QImode value is in the least significant part of a | |
6502 | slot big enough for a SImode. If foo is some other sort of | |
6503 | memory reference, then it is impossible to reload this case, | |
6504 | so previous passes had better make sure this never happens. | |
6505 | ||
6506 | Then consider a one-word union which has SImode and one of its | |
6507 | members is a float, being fetched as (SUBREG:SF union:SI). | |
6508 | We must fetch that as SFmode because we could be loading into | |
6509 | a float-only register. In this case OLD's mode is correct. | |
6510 | ||
6511 | Consider an immediate integer: it has VOIDmode. Here we need | |
6512 | to get a mode from something else. | |
6513 | ||
6514 | In some cases, there is a fourth mode, the operand's | |
6515 | containing mode. If the insn specifies a containing mode for | |
6516 | this operand, it overrides all others. | |
6517 | ||
6518 | I am not sure whether the algorithm here is always right, | |
6519 | but it does the right things in those cases. */ | |
6520 | ||
6521 | mode = GET_MODE (old); | |
6522 | if (mode == VOIDmode) | |
6523 | mode = reload_inmode[j]; | |
32131a9c RK |
6524 | |
6525 | #ifdef SECONDARY_INPUT_RELOAD_CLASS | |
6526 | /* If we need a secondary register for this operation, see if | |
6527 | the value is already in a register in that class. Don't | |
6528 | do this if the secondary register will be used as a scratch | |
6529 | register. */ | |
6530 | ||
b80bba27 RK |
6531 | if (reload_secondary_in_reload[j] >= 0 |
6532 | && reload_secondary_in_icode[j] == CODE_FOR_nothing | |
58b1581b | 6533 | && optimize) |
32131a9c RK |
6534 | oldequiv |
6535 | = find_equiv_reg (old, insn, | |
b80bba27 | 6536 | reload_reg_class[reload_secondary_in_reload[j]], |
fb3821f7 | 6537 | -1, NULL_PTR, 0, mode); |
32131a9c RK |
6538 | #endif |
6539 | ||
6540 | /* If reloading from memory, see if there is a register | |
6541 | that already holds the same value. If so, reload from there. | |
6542 | We can pass 0 as the reload_reg_p argument because | |
6543 | any other reload has either already been emitted, | |
6544 | in which case find_equiv_reg will see the reload-insn, | |
6545 | or has yet to be emitted, in which case it doesn't matter | |
6546 | because we will use this equiv reg right away. */ | |
6547 | ||
58b1581b | 6548 | if (oldequiv == 0 && optimize |
32131a9c RK |
6549 | && (GET_CODE (old) == MEM |
6550 | || (GET_CODE (old) == REG | |
6551 | && REGNO (old) >= FIRST_PSEUDO_REGISTER | |
6552 | && reg_renumber[REGNO (old)] < 0))) | |
546b63fb | 6553 | oldequiv = find_equiv_reg (old, insn, ALL_REGS, |
fb3821f7 | 6554 | -1, NULL_PTR, 0, mode); |
32131a9c RK |
6555 | |
6556 | if (oldequiv) | |
6557 | { | |
6558 | int regno = true_regnum (oldequiv); | |
6559 | ||
6560 | /* If OLDEQUIV is a spill register, don't use it for this | |
6561 | if any other reload needs it at an earlier stage of this insn | |
a8fdc208 | 6562 | or at this stage. */ |
32131a9c | 6563 | if (spill_reg_order[regno] >= 0 |
546b63fb RK |
6564 | && (! reload_reg_free_p (regno, reload_opnum[j], |
6565 | reload_when_needed[j]) | |
6566 | || ! reload_reg_free_before_p (regno, reload_opnum[j], | |
6f77675f | 6567 | reload_when_needed[j], 1))) |
32131a9c RK |
6568 | oldequiv = 0; |
6569 | ||
6570 | /* If OLDEQUIV is not a spill register, | |
6571 | don't use it if any other reload wants it. */ | |
6572 | if (spill_reg_order[regno] < 0) | |
6573 | { | |
6574 | int k; | |
6575 | for (k = 0; k < n_reloads; k++) | |
6576 | if (reload_reg_rtx[k] != 0 && k != j | |
bfa30b22 RK |
6577 | && reg_overlap_mentioned_for_reload_p (reload_reg_rtx[k], |
6578 | oldequiv)) | |
32131a9c RK |
6579 | { |
6580 | oldequiv = 0; | |
6581 | break; | |
6582 | } | |
6583 | } | |
546b63fb RK |
6584 | |
6585 | /* If it is no cheaper to copy from OLDEQUIV into the | |
6586 | reload register than it would be to move from memory, | |
6587 | don't use it. Likewise, if we need a secondary register | |
6588 | or memory. */ | |
6589 | ||
6590 | if (oldequiv != 0 | |
6591 | && ((REGNO_REG_CLASS (regno) != reload_reg_class[j] | |
6592 | && (REGISTER_MOVE_COST (REGNO_REG_CLASS (regno), | |
6593 | reload_reg_class[j]) | |
370b1b83 | 6594 | >= MEMORY_MOVE_COST (mode, reload_reg_class[j], 1))) |
546b63fb RK |
6595 | #ifdef SECONDARY_INPUT_RELOAD_CLASS |
6596 | || (SECONDARY_INPUT_RELOAD_CLASS (reload_reg_class[j], | |
6597 | mode, oldequiv) | |
6598 | != NO_REGS) | |
6599 | #endif | |
6600 | #ifdef SECONDARY_MEMORY_NEEDED | |
370b1b83 R |
6601 | || SECONDARY_MEMORY_NEEDED (REGNO_REG_CLASS (regno), |
6602 | reload_reg_class[j], | |
546b63fb RK |
6603 | mode) |
6604 | #endif | |
6605 | )) | |
6606 | oldequiv = 0; | |
32131a9c RK |
6607 | } |
6608 | ||
cb2afeb3 R |
6609 | /* delete_output_reload is only invoked properly if old contains |
6610 | the original pseudo register. Since this is replaced with a | |
6611 | hard reg when RELOAD_OVERRIDE_IN is set, see if we can | |
6612 | find the pseudo in RELOAD_IN_REG. */ | |
6613 | if (oldequiv == 0 | |
6614 | && reload_override_in[j] | |
6615 | && GET_CODE (reload_in_reg[j]) == REG) | |
6616 | { | |
6617 | oldequiv = old; | |
6618 | old = reload_in_reg[j]; | |
6619 | } | |
32131a9c RK |
6620 | if (oldequiv == 0) |
6621 | oldequiv = old; | |
6622 | else if (GET_CODE (oldequiv) == REG) | |
6623 | oldequiv_reg = oldequiv; | |
6624 | else if (GET_CODE (oldequiv) == SUBREG) | |
6625 | oldequiv_reg = SUBREG_REG (oldequiv); | |
6626 | ||
76182796 RK |
6627 | /* If we are reloading from a register that was recently stored in |
6628 | with an output-reload, see if we can prove there was | |
6629 | actually no need to store the old value in it. */ | |
6630 | ||
6631 | if (optimize && GET_CODE (oldequiv) == REG | |
6632 | && REGNO (oldequiv) < FIRST_PSEUDO_REGISTER | |
e6e52be0 | 6633 | && spill_reg_store[REGNO (oldequiv)] |
cb2afeb3 R |
6634 | && GET_CODE (old) == REG |
6635 | && (dead_or_set_p (insn, spill_reg_stored_to[REGNO (oldequiv)]) | |
6636 | || rtx_equal_p (spill_reg_stored_to[REGNO (oldequiv)], | |
6637 | reload_out_reg[j]))) | |
6638 | delete_output_reload (insn, j, REGNO (oldequiv)); | |
76182796 | 6639 | |
32131a9c | 6640 | /* Encapsulate both RELOADREG and OLDEQUIV into that mode, |
3abe6f90 RK |
6641 | then load RELOADREG from OLDEQUIV. Note that we cannot use |
6642 | gen_lowpart_common since it can do the wrong thing when | |
6643 | RELOADREG has a multi-word mode. Note that RELOADREG | |
6644 | must always be a REG here. */ | |
32131a9c RK |
6645 | |
6646 | if (GET_MODE (reloadreg) != mode) | |
38a448ca | 6647 | reloadreg = gen_rtx_REG (mode, REGNO (reloadreg)); |
32131a9c RK |
6648 | while (GET_CODE (oldequiv) == SUBREG && GET_MODE (oldequiv) != mode) |
6649 | oldequiv = SUBREG_REG (oldequiv); | |
6650 | if (GET_MODE (oldequiv) != VOIDmode | |
6651 | && mode != GET_MODE (oldequiv)) | |
38a448ca | 6652 | oldequiv = gen_rtx_SUBREG (mode, oldequiv, 0); |
32131a9c | 6653 | |
546b63fb | 6654 | /* Switch to the right place to emit the reload insns. */ |
32131a9c RK |
6655 | switch (reload_when_needed[j]) |
6656 | { | |
32131a9c | 6657 | case RELOAD_OTHER: |
546b63fb RK |
6658 | where = &other_input_reload_insns; |
6659 | break; | |
6660 | case RELOAD_FOR_INPUT: | |
6661 | where = &input_reload_insns[reload_opnum[j]]; | |
32131a9c | 6662 | break; |
546b63fb RK |
6663 | case RELOAD_FOR_INPUT_ADDRESS: |
6664 | where = &input_address_reload_insns[reload_opnum[j]]; | |
32131a9c | 6665 | break; |
47c8cf91 ILT |
6666 | case RELOAD_FOR_INPADDR_ADDRESS: |
6667 | where = &inpaddr_address_reload_insns[reload_opnum[j]]; | |
6668 | break; | |
546b63fb RK |
6669 | case RELOAD_FOR_OUTPUT_ADDRESS: |
6670 | where = &output_address_reload_insns[reload_opnum[j]]; | |
32131a9c | 6671 | break; |
47c8cf91 ILT |
6672 | case RELOAD_FOR_OUTADDR_ADDRESS: |
6673 | where = &outaddr_address_reload_insns[reload_opnum[j]]; | |
6674 | break; | |
32131a9c | 6675 | case RELOAD_FOR_OPERAND_ADDRESS: |
546b63fb RK |
6676 | where = &operand_reload_insns; |
6677 | break; | |
893bc853 RK |
6678 | case RELOAD_FOR_OPADDR_ADDR: |
6679 | where = &other_operand_reload_insns; | |
6680 | break; | |
546b63fb RK |
6681 | case RELOAD_FOR_OTHER_ADDRESS: |
6682 | where = &other_input_address_reload_insns; | |
6683 | break; | |
6684 | default: | |
6685 | abort (); | |
32131a9c RK |
6686 | } |
6687 | ||
546b63fb | 6688 | push_to_sequence (*where); |
32131a9c RK |
6689 | special = 0; |
6690 | ||
6691 | /* Auto-increment addresses must be reloaded in a special way. */ | |
cb2afeb3 | 6692 | if (reload_out[j] && ! reload_out_reg[j]) |
32131a9c RK |
6693 | { |
6694 | /* We are not going to bother supporting the case where a | |
6695 | incremented register can't be copied directly from | |
6696 | OLDEQUIV since this seems highly unlikely. */ | |
b80bba27 | 6697 | if (reload_secondary_in_reload[j] >= 0) |
32131a9c | 6698 | abort (); |
cb2afeb3 R |
6699 | |
6700 | if (reload_inherited[j]) | |
6701 | oldequiv = reloadreg; | |
6702 | ||
6703 | old = XEXP (reload_in_reg[j], 0); | |
6704 | ||
6705 | if (optimize && GET_CODE (oldequiv) == REG | |
6706 | && REGNO (oldequiv) < FIRST_PSEUDO_REGISTER | |
6707 | && spill_reg_store[REGNO (oldequiv)] | |
6708 | && GET_CODE (old) == REG | |
6709 | && (dead_or_set_p (insn, | |
6710 | spill_reg_stored_to[REGNO (oldequiv)]) | |
6711 | || rtx_equal_p (spill_reg_stored_to[REGNO (oldequiv)], | |
6712 | old))) | |
6713 | delete_output_reload (insn, j, REGNO (oldequiv)); | |
6714 | ||
32131a9c RK |
6715 | /* Prevent normal processing of this reload. */ |
6716 | special = 1; | |
6717 | /* Output a special code sequence for this case. */ | |
cb2afeb3 R |
6718 | new_spill_reg_store[REGNO (reloadreg)] |
6719 | = inc_for_reload (reloadreg, oldequiv, reload_out[j], | |
6720 | reload_inc[j]); | |
32131a9c RK |
6721 | } |
6722 | ||
6723 | /* If we are reloading a pseudo-register that was set by the previous | |
6724 | insn, see if we can get rid of that pseudo-register entirely | |
6725 | by redirecting the previous insn into our reload register. */ | |
6726 | ||
6727 | else if (optimize && GET_CODE (old) == REG | |
6728 | && REGNO (old) >= FIRST_PSEUDO_REGISTER | |
6729 | && dead_or_set_p (insn, old) | |
6730 | /* This is unsafe if some other reload | |
6731 | uses the same reg first. */ | |
546b63fb RK |
6732 | && reload_reg_free_before_p (REGNO (reloadreg), |
6733 | reload_opnum[j], | |
6f77675f | 6734 | reload_when_needed[j], 0)) |
32131a9c RK |
6735 | { |
6736 | rtx temp = PREV_INSN (insn); | |
6737 | while (temp && GET_CODE (temp) == NOTE) | |
6738 | temp = PREV_INSN (temp); | |
6739 | if (temp | |
6740 | && GET_CODE (temp) == INSN | |
6741 | && GET_CODE (PATTERN (temp)) == SET | |
6742 | && SET_DEST (PATTERN (temp)) == old | |
6743 | /* Make sure we can access insn_operand_constraint. */ | |
6744 | && asm_noperands (PATTERN (temp)) < 0 | |
6745 | /* This is unsafe if prev insn rejects our reload reg. */ | |
6746 | && constraint_accepts_reg_p (insn_operand_constraint[recog_memoized (temp)][0], | |
6747 | reloadreg) | |
6748 | /* This is unsafe if operand occurs more than once in current | |
6749 | insn. Perhaps some occurrences aren't reloaded. */ | |
6750 | && count_occurrences (PATTERN (insn), old) == 1 | |
6751 | /* Don't risk splitting a matching pair of operands. */ | |
6752 | && ! reg_mentioned_p (old, SET_SRC (PATTERN (temp)))) | |
6753 | { | |
6754 | /* Store into the reload register instead of the pseudo. */ | |
6755 | SET_DEST (PATTERN (temp)) = reloadreg; | |
6756 | /* If these are the only uses of the pseudo reg, | |
6757 | pretend for GDB it lives in the reload reg we used. */ | |
b1f21e0a MM |
6758 | if (REG_N_DEATHS (REGNO (old)) == 1 |
6759 | && REG_N_SETS (REGNO (old)) == 1) | |
32131a9c RK |
6760 | { |
6761 | reg_renumber[REGNO (old)] = REGNO (reload_reg_rtx[j]); | |
6762 | alter_reg (REGNO (old), -1); | |
6763 | } | |
6764 | special = 1; | |
6765 | } | |
6766 | } | |
6767 | ||
546b63fb RK |
6768 | /* We can't do that, so output an insn to load RELOADREG. */ |
6769 | ||
32131a9c RK |
6770 | if (! special) |
6771 | { | |
6772 | #ifdef SECONDARY_INPUT_RELOAD_CLASS | |
6773 | rtx second_reload_reg = 0; | |
6774 | enum insn_code icode; | |
6775 | ||
6776 | /* If we have a secondary reload, pick up the secondary register | |
d445b551 RK |
6777 | and icode, if any. If OLDEQUIV and OLD are different or |
6778 | if this is an in-out reload, recompute whether or not we | |
6779 | still need a secondary register and what the icode should | |
6780 | be. If we still need a secondary register and the class or | |
6781 | icode is different, go back to reloading from OLD if using | |
6782 | OLDEQUIV means that we got the wrong type of register. We | |
6783 | cannot have different class or icode due to an in-out reload | |
6784 | because we don't make such reloads when both the input and | |
6785 | output need secondary reload registers. */ | |
32131a9c | 6786 | |
b80bba27 | 6787 | if (reload_secondary_in_reload[j] >= 0) |
32131a9c | 6788 | { |
b80bba27 | 6789 | int secondary_reload = reload_secondary_in_reload[j]; |
1554c2c6 RK |
6790 | rtx real_oldequiv = oldequiv; |
6791 | rtx real_old = old; | |
6792 | ||
6793 | /* If OLDEQUIV is a pseudo with a MEM, get the real MEM | |
6794 | and similarly for OLD. | |
b80bba27 | 6795 | See comments in get_secondary_reload in reload.c. */ |
cb2afeb3 R |
6796 | /* If it is a pseudo that cannot be replaced with its |
6797 | equivalent MEM, we must fall back to reload_in, which | |
6798 | will have all the necessary substitutions registered. */ | |
6799 | ||
1554c2c6 RK |
6800 | if (GET_CODE (oldequiv) == REG |
6801 | && REGNO (oldequiv) >= FIRST_PSEUDO_REGISTER | |
cb2afeb3 R |
6802 | && reg_equiv_memory_loc[REGNO (oldequiv)] != 0) |
6803 | { | |
6804 | if (reg_equiv_address[REGNO (oldequiv)] | |
6805 | || num_not_at_initial_offset) | |
6806 | real_oldequiv = reload_in[j]; | |
6807 | else | |
6808 | real_oldequiv = reg_equiv_mem[REGNO (oldequiv)]; | |
6809 | } | |
1554c2c6 RK |
6810 | |
6811 | if (GET_CODE (old) == REG | |
6812 | && REGNO (old) >= FIRST_PSEUDO_REGISTER | |
cb2afeb3 R |
6813 | && reg_equiv_memory_loc[REGNO (old)] != 0) |
6814 | { | |
6815 | if (reg_equiv_address[REGNO (old)] | |
6816 | || num_not_at_initial_offset) | |
6817 | real_old = reload_in[j]; | |
6818 | else | |
6819 | real_old = reg_equiv_mem[REGNO (old)]; | |
6820 | } | |
1554c2c6 | 6821 | |
32131a9c | 6822 | second_reload_reg = reload_reg_rtx[secondary_reload]; |
b80bba27 | 6823 | icode = reload_secondary_in_icode[j]; |
32131a9c | 6824 | |
d445b551 RK |
6825 | if ((old != oldequiv && ! rtx_equal_p (old, oldequiv)) |
6826 | || (reload_in[j] != 0 && reload_out[j] != 0)) | |
32131a9c RK |
6827 | { |
6828 | enum reg_class new_class | |
6829 | = SECONDARY_INPUT_RELOAD_CLASS (reload_reg_class[j], | |
1554c2c6 | 6830 | mode, real_oldequiv); |
32131a9c RK |
6831 | |
6832 | if (new_class == NO_REGS) | |
6833 | second_reload_reg = 0; | |
6834 | else | |
6835 | { | |
6836 | enum insn_code new_icode; | |
6837 | enum machine_mode new_mode; | |
6838 | ||
6839 | if (! TEST_HARD_REG_BIT (reg_class_contents[(int) new_class], | |
6840 | REGNO (second_reload_reg))) | |
1554c2c6 | 6841 | oldequiv = old, real_oldequiv = real_old; |
32131a9c RK |
6842 | else |
6843 | { | |
6844 | new_icode = reload_in_optab[(int) mode]; | |
6845 | if (new_icode != CODE_FOR_nothing | |
6846 | && ((insn_operand_predicate[(int) new_icode][0] | |
a8fdc208 | 6847 | && ! ((*insn_operand_predicate[(int) new_icode][0]) |
32131a9c | 6848 | (reloadreg, mode))) |
a8fdc208 RS |
6849 | || (insn_operand_predicate[(int) new_icode][1] |
6850 | && ! ((*insn_operand_predicate[(int) new_icode][1]) | |
1554c2c6 | 6851 | (real_oldequiv, mode))))) |
32131a9c RK |
6852 | new_icode = CODE_FOR_nothing; |
6853 | ||
6854 | if (new_icode == CODE_FOR_nothing) | |
6855 | new_mode = mode; | |
6856 | else | |
196ddf8a | 6857 | new_mode = insn_operand_mode[(int) new_icode][2]; |
32131a9c RK |
6858 | |
6859 | if (GET_MODE (second_reload_reg) != new_mode) | |
6860 | { | |
6861 | if (!HARD_REGNO_MODE_OK (REGNO (second_reload_reg), | |
6862 | new_mode)) | |
1554c2c6 | 6863 | oldequiv = old, real_oldequiv = real_old; |
32131a9c RK |
6864 | else |
6865 | second_reload_reg | |
38a448ca RH |
6866 | = gen_rtx_REG (new_mode, |
6867 | REGNO (second_reload_reg)); | |
32131a9c RK |
6868 | } |
6869 | } | |
6870 | } | |
6871 | } | |
6872 | ||
6873 | /* If we still need a secondary reload register, check | |
6874 | to see if it is being used as a scratch or intermediate | |
1554c2c6 RK |
6875 | register and generate code appropriately. If we need |
6876 | a scratch register, use REAL_OLDEQUIV since the form of | |
6877 | the insn may depend on the actual address if it is | |
6878 | a MEM. */ | |
32131a9c RK |
6879 | |
6880 | if (second_reload_reg) | |
6881 | { | |
6882 | if (icode != CODE_FOR_nothing) | |
6883 | { | |
5e03c156 RK |
6884 | emit_insn (GEN_FCN (icode) (reloadreg, real_oldequiv, |
6885 | second_reload_reg)); | |
32131a9c RK |
6886 | special = 1; |
6887 | } | |
6888 | else | |
6889 | { | |
6890 | /* See if we need a scratch register to load the | |
6891 | intermediate register (a tertiary reload). */ | |
6892 | enum insn_code tertiary_icode | |
b80bba27 | 6893 | = reload_secondary_in_icode[secondary_reload]; |
32131a9c RK |
6894 | |
6895 | if (tertiary_icode != CODE_FOR_nothing) | |
6896 | { | |
6897 | rtx third_reload_reg | |
b80bba27 | 6898 | = reload_reg_rtx[reload_secondary_in_reload[secondary_reload]]; |
32131a9c | 6899 | |
546b63fb RK |
6900 | emit_insn ((GEN_FCN (tertiary_icode) |
6901 | (second_reload_reg, real_oldequiv, | |
6902 | third_reload_reg))); | |
32131a9c RK |
6903 | } |
6904 | else | |
cb2afeb3 | 6905 | gen_reload (second_reload_reg, real_oldequiv, |
5e03c156 RK |
6906 | reload_opnum[j], |
6907 | reload_when_needed[j]); | |
546b63fb RK |
6908 | |
6909 | oldequiv = second_reload_reg; | |
32131a9c RK |
6910 | } |
6911 | } | |
6912 | } | |
6913 | #endif | |
6914 | ||
2d182c6f | 6915 | if (! special && ! rtx_equal_p (reloadreg, oldequiv)) |
cb2afeb3 R |
6916 | { |
6917 | rtx real_oldequiv = oldequiv; | |
6918 | ||
6919 | if ((GET_CODE (oldequiv) == REG | |
6920 | && REGNO (oldequiv) >= FIRST_PSEUDO_REGISTER | |
6921 | && reg_equiv_memory_loc[REGNO (oldequiv)] != 0) | |
6922 | || (GET_CODE (oldequiv) == SUBREG | |
6923 | && GET_CODE (SUBREG_REG (oldequiv)) == REG | |
6924 | && (REGNO (SUBREG_REG (oldequiv)) | |
6925 | >= FIRST_PSEUDO_REGISTER) | |
6926 | && (reg_equiv_memory_loc | |
6927 | [REGNO (SUBREG_REG (oldequiv))] != 0))) | |
6928 | real_oldequiv = reload_in[j]; | |
6929 | gen_reload (reloadreg, real_oldequiv, reload_opnum[j], | |
6930 | reload_when_needed[j]); | |
6931 | } | |
32131a9c | 6932 | |
32131a9c RK |
6933 | } |
6934 | ||
80d92002 | 6935 | this_reload_insn = get_last_insn (); |
546b63fb RK |
6936 | /* End this sequence. */ |
6937 | *where = get_insns (); | |
6938 | end_sequence (); | |
cb2afeb3 R |
6939 | |
6940 | /* Update reload_override_in so that delete_address_reloads_1 | |
6941 | can see the actual register usage. */ | |
6942 | if (oldequiv_reg) | |
6943 | reload_override_in[j] = oldequiv; | |
32131a9c RK |
6944 | } |
6945 | ||
b60a8416 R |
6946 | /* When inheriting a wider reload, we have a MEM in reload_in[j], |
6947 | e.g. inheriting a SImode output reload for | |
6948 | (mem:HI (plus:SI (reg:SI 14 fp) (const_int 10))) */ | |
6949 | if (optimize && reload_inherited[j] && reload_in[j] | |
6950 | && GET_CODE (reload_in[j]) == MEM | |
cb2afeb3 | 6951 | && GET_CODE (reload_in_reg[j]) == MEM |
b60a8416 R |
6952 | && reload_spill_index[j] >= 0 |
6953 | && TEST_HARD_REG_BIT (reg_reloaded_valid, reload_spill_index[j])) | |
6954 | { | |
6955 | expect_occurrences | |
6956 | = count_occurrences (PATTERN (insn), reload_in[j]) == 1 ? 0 : -1; | |
6957 | reload_in[j] | |
6958 | = regno_reg_rtx[reg_reloaded_contents[reload_spill_index[j]]]; | |
6959 | } | |
32131a9c RK |
6960 | |
6961 | /* If we are reloading a register that was recently stored in with an | |
6962 | output-reload, see if we can prove there was | |
6963 | actually no need to store the old value in it. */ | |
6964 | ||
cb2afeb3 R |
6965 | if (optimize |
6966 | && (reload_inherited[j] || reload_override_in[j]) | |
6967 | && reload_reg_rtx[j] | |
6968 | && GET_CODE (reload_reg_rtx[j]) == REG | |
6969 | && spill_reg_store[REGNO (reload_reg_rtx[j])] != 0 | |
32131a9c RK |
6970 | #if 0 |
6971 | /* There doesn't seem to be any reason to restrict this to pseudos | |
6972 | and doing so loses in the case where we are copying from a | |
6973 | register of the wrong class. */ | |
cb2afeb3 R |
6974 | && REGNO (spill_reg_stored_to[REGNO (reload_reg_rtx[j])]) |
6975 | >= FIRST_PSEUDO_REGISTER | |
32131a9c | 6976 | #endif |
cb2afeb3 R |
6977 | /* The insn might have already some references to stackslots |
6978 | replaced by MEMs, while reload_out_reg still names the | |
6979 | original pseudo. */ | |
6980 | && (dead_or_set_p (insn, | |
6981 | spill_reg_stored_to[REGNO (reload_reg_rtx[j])]) | |
6982 | || rtx_equal_p (spill_reg_stored_to[REGNO (reload_reg_rtx[j])], | |
6983 | reload_out_reg[j]))) | |
6984 | delete_output_reload (insn, j, REGNO (reload_reg_rtx[j])); | |
32131a9c RK |
6985 | |
6986 | /* Input-reloading is done. Now do output-reloading, | |
6987 | storing the value from the reload-register after the main insn | |
6988 | if reload_out[j] is nonzero. | |
6989 | ||
6990 | ??? At some point we need to support handling output reloads of | |
6991 | JUMP_INSNs or insns that set cc0. */ | |
cb2afeb3 R |
6992 | |
6993 | /* If this is an output reload that stores something that is | |
6994 | not loaded in this same reload, see if we can eliminate a previous | |
6995 | store. */ | |
6996 | { | |
6997 | rtx pseudo = reload_out_reg[j]; | |
6998 | ||
6999 | if (pseudo | |
7000 | && GET_CODE (pseudo) == REG | |
7001 | && ! rtx_equal_p (reload_in_reg[j], pseudo) | |
7002 | && REGNO (pseudo) >= FIRST_PSEUDO_REGISTER | |
7003 | && reg_last_reload_reg[REGNO (pseudo)]) | |
7004 | { | |
7005 | int pseudo_no = REGNO (pseudo); | |
7006 | int last_regno = REGNO (reg_last_reload_reg[pseudo_no]); | |
7007 | ||
7008 | /* We don't need to test full validity of last_regno for | |
7009 | inherit here; we only want to know if the store actually | |
7010 | matches the pseudo. */ | |
7011 | if (reg_reloaded_contents[last_regno] == pseudo_no | |
7012 | && spill_reg_store[last_regno] | |
7013 | && rtx_equal_p (pseudo, spill_reg_stored_to[last_regno])) | |
7014 | delete_output_reload (insn, j, last_regno); | |
7015 | } | |
7016 | } | |
7017 | ||
7018 | old = reload_out_reg[j]; | |
32131a9c RK |
7019 | if (old != 0 |
7020 | && reload_reg_rtx[j] != old | |
7021 | && reload_reg_rtx[j] != 0) | |
7022 | { | |
7023 | register rtx reloadreg = reload_reg_rtx[j]; | |
29a82058 | 7024 | #ifdef SECONDARY_OUTPUT_RELOAD_CLASS |
32131a9c | 7025 | register rtx second_reloadreg = 0; |
29a82058 | 7026 | #endif |
32131a9c RK |
7027 | rtx note, p; |
7028 | enum machine_mode mode; | |
7029 | int special = 0; | |
7030 | ||
7031 | /* An output operand that dies right away does need a reload, | |
7032 | but need not be copied from it. Show the new location in the | |
7033 | REG_UNUSED note. */ | |
7034 | if ((GET_CODE (old) == REG || GET_CODE (old) == SCRATCH) | |
7035 | && (note = find_reg_note (insn, REG_UNUSED, old)) != 0) | |
7036 | { | |
7037 | XEXP (note, 0) = reload_reg_rtx[j]; | |
7038 | continue; | |
7039 | } | |
a7911cd2 RK |
7040 | /* Likewise for a SUBREG of an operand that dies. */ |
7041 | else if (GET_CODE (old) == SUBREG | |
7042 | && GET_CODE (SUBREG_REG (old)) == REG | |
7043 | && 0 != (note = find_reg_note (insn, REG_UNUSED, | |
7044 | SUBREG_REG (old)))) | |
7045 | { | |
7046 | XEXP (note, 0) = gen_lowpart_common (GET_MODE (old), | |
7047 | reload_reg_rtx[j]); | |
7048 | continue; | |
7049 | } | |
32131a9c RK |
7050 | else if (GET_CODE (old) == SCRATCH) |
7051 | /* If we aren't optimizing, there won't be a REG_UNUSED note, | |
7052 | but we don't want to make an output reload. */ | |
7053 | continue; | |
7054 | ||
7055 | #if 0 | |
7056 | /* Strip off of OLD any size-increasing SUBREGs such as | |
7057 | (SUBREG:SI foo:QI 0). */ | |
7058 | ||
7059 | while (GET_CODE (old) == SUBREG && SUBREG_WORD (old) == 0 | |
7060 | && (GET_MODE_SIZE (GET_MODE (old)) | |
7061 | > GET_MODE_SIZE (GET_MODE (SUBREG_REG (old))))) | |
7062 | old = SUBREG_REG (old); | |
7063 | #endif | |
7064 | ||
7065 | /* If is a JUMP_INSN, we can't support output reloads yet. */ | |
7066 | if (GET_CODE (insn) == JUMP_INSN) | |
7067 | abort (); | |
7068 | ||
d7e0324f | 7069 | if (reload_when_needed[j] == RELOAD_OTHER) |
5ca582cf | 7070 | start_sequence (); |
d7e0324f RK |
7071 | else |
7072 | push_to_sequence (output_reload_insns[reload_opnum[j]]); | |
546b63fb | 7073 | |
cb2afeb3 R |
7074 | old = reload_out[j]; |
7075 | ||
32131a9c RK |
7076 | /* Determine the mode to reload in. |
7077 | See comments above (for input reloading). */ | |
7078 | ||
7079 | mode = GET_MODE (old); | |
7080 | if (mode == VOIDmode) | |
79a365a7 RS |
7081 | { |
7082 | /* VOIDmode should never happen for an output. */ | |
7083 | if (asm_noperands (PATTERN (insn)) < 0) | |
7084 | /* It's the compiler's fault. */ | |
a89b2cc4 | 7085 | fatal_insn ("VOIDmode on an output", insn); |
79a365a7 RS |
7086 | error_for_asm (insn, "output operand is constant in `asm'"); |
7087 | /* Prevent crash--use something we know is valid. */ | |
7088 | mode = word_mode; | |
38a448ca | 7089 | old = gen_rtx_REG (mode, REGNO (reloadreg)); |
79a365a7 | 7090 | } |
32131a9c | 7091 | |
32131a9c | 7092 | if (GET_MODE (reloadreg) != mode) |
38a448ca | 7093 | reloadreg = gen_rtx_REG (mode, REGNO (reloadreg)); |
32131a9c RK |
7094 | |
7095 | #ifdef SECONDARY_OUTPUT_RELOAD_CLASS | |
7096 | ||
7097 | /* If we need two reload regs, set RELOADREG to the intermediate | |
5e03c156 | 7098 | one, since it will be stored into OLD. We might need a secondary |
32131a9c RK |
7099 | register only for an input reload, so check again here. */ |
7100 | ||
b80bba27 | 7101 | if (reload_secondary_out_reload[j] >= 0) |
32131a9c | 7102 | { |
1554c2c6 | 7103 | rtx real_old = old; |
32131a9c | 7104 | |
1554c2c6 RK |
7105 | if (GET_CODE (old) == REG && REGNO (old) >= FIRST_PSEUDO_REGISTER |
7106 | && reg_equiv_mem[REGNO (old)] != 0) | |
7107 | real_old = reg_equiv_mem[REGNO (old)]; | |
32131a9c | 7108 | |
1554c2c6 RK |
7109 | if((SECONDARY_OUTPUT_RELOAD_CLASS (reload_reg_class[j], |
7110 | mode, real_old) | |
7111 | != NO_REGS)) | |
7112 | { | |
7113 | second_reloadreg = reloadreg; | |
b80bba27 | 7114 | reloadreg = reload_reg_rtx[reload_secondary_out_reload[j]]; |
32131a9c | 7115 | |
1554c2c6 RK |
7116 | /* See if RELOADREG is to be used as a scratch register |
7117 | or as an intermediate register. */ | |
b80bba27 | 7118 | if (reload_secondary_out_icode[j] != CODE_FOR_nothing) |
32131a9c | 7119 | { |
b80bba27 | 7120 | emit_insn ((GEN_FCN (reload_secondary_out_icode[j]) |
546b63fb | 7121 | (real_old, second_reloadreg, reloadreg))); |
1554c2c6 | 7122 | special = 1; |
32131a9c RK |
7123 | } |
7124 | else | |
1554c2c6 RK |
7125 | { |
7126 | /* See if we need both a scratch and intermediate reload | |
7127 | register. */ | |
5e03c156 | 7128 | |
b80bba27 | 7129 | int secondary_reload = reload_secondary_out_reload[j]; |
1554c2c6 | 7130 | enum insn_code tertiary_icode |
b80bba27 | 7131 | = reload_secondary_out_icode[secondary_reload]; |
32131a9c | 7132 | |
1554c2c6 | 7133 | if (GET_MODE (reloadreg) != mode) |
38a448ca | 7134 | reloadreg = gen_rtx_REG (mode, REGNO (reloadreg)); |
1554c2c6 RK |
7135 | |
7136 | if (tertiary_icode != CODE_FOR_nothing) | |
7137 | { | |
7138 | rtx third_reloadreg | |
b80bba27 | 7139 | = reload_reg_rtx[reload_secondary_out_reload[secondary_reload]]; |
a7911cd2 | 7140 | rtx tem; |
5e03c156 RK |
7141 | |
7142 | /* Copy primary reload reg to secondary reload reg. | |
7143 | (Note that these have been swapped above, then | |
7144 | secondary reload reg to OLD using our insn. */ | |
7145 | ||
a7911cd2 RK |
7146 | /* If REAL_OLD is a paradoxical SUBREG, remove it |
7147 | and try to put the opposite SUBREG on | |
7148 | RELOADREG. */ | |
7149 | if (GET_CODE (real_old) == SUBREG | |
7150 | && (GET_MODE_SIZE (GET_MODE (real_old)) | |
7151 | > GET_MODE_SIZE (GET_MODE (SUBREG_REG (real_old)))) | |
7152 | && 0 != (tem = gen_lowpart_common | |
7153 | (GET_MODE (SUBREG_REG (real_old)), | |
7154 | reloadreg))) | |
7155 | real_old = SUBREG_REG (real_old), reloadreg = tem; | |
7156 | ||
5e03c156 RK |
7157 | gen_reload (reloadreg, second_reloadreg, |
7158 | reload_opnum[j], reload_when_needed[j]); | |
7159 | emit_insn ((GEN_FCN (tertiary_icode) | |
7160 | (real_old, reloadreg, third_reloadreg))); | |
7161 | special = 1; | |
9ad5f9f6 | 7162 | } |
5e03c156 | 7163 | |
1554c2c6 | 7164 | else |
5e03c156 RK |
7165 | /* Copy between the reload regs here and then to |
7166 | OUT later. */ | |
1554c2c6 | 7167 | |
5e03c156 RK |
7168 | gen_reload (reloadreg, second_reloadreg, |
7169 | reload_opnum[j], reload_when_needed[j]); | |
1554c2c6 | 7170 | } |
32131a9c RK |
7171 | } |
7172 | } | |
7173 | #endif | |
7174 | ||
7175 | /* Output the last reload insn. */ | |
7176 | if (! special) | |
d7c2e385 L |
7177 | { |
7178 | rtx set; | |
7179 | ||
7180 | /* Don't output the last reload if OLD is not the dest of | |
7181 | INSN and is in the src and is clobbered by INSN. */ | |
7182 | if (! flag_expensive_optimizations | |
7183 | || GET_CODE (old) != REG | |
7184 | || !(set = single_set (insn)) | |
7185 | || rtx_equal_p (old, SET_DEST (set)) | |
7186 | || !reg_mentioned_p (old, SET_SRC (set)) | |
7187 | || !regno_clobbered_p (REGNO (old), insn)) | |
7188 | gen_reload (old, reloadreg, reload_opnum[j], | |
7189 | reload_when_needed[j]); | |
7190 | } | |
32131a9c | 7191 | |
32131a9c | 7192 | /* Look at all insns we emitted, just to be safe. */ |
546b63fb | 7193 | for (p = get_insns (); p; p = NEXT_INSN (p)) |
32131a9c RK |
7194 | if (GET_RTX_CLASS (GET_CODE (p)) == 'i') |
7195 | { | |
e6e52be0 R |
7196 | rtx pat = PATTERN (p); |
7197 | ||
32131a9c RK |
7198 | /* If this output reload doesn't come from a spill reg, |
7199 | clear any memory of reloaded copies of the pseudo reg. | |
7200 | If this output reload comes from a spill reg, | |
7201 | reg_has_output_reload will make this do nothing. */ | |
e6e52be0 R |
7202 | note_stores (pat, forget_old_reloads_1); |
7203 | ||
7204 | if (reg_mentioned_p (reload_reg_rtx[j], pat)) | |
7205 | { | |
cb2afeb3 | 7206 | rtx set = single_set (insn); |
e6e52be0 | 7207 | if (reload_spill_index[j] < 0 |
cb2afeb3 R |
7208 | && set |
7209 | && SET_SRC (set) == reload_reg_rtx[j]) | |
e6e52be0 | 7210 | { |
cb2afeb3 | 7211 | int src = REGNO (SET_SRC (set)); |
32131a9c | 7212 | |
e6e52be0 R |
7213 | reload_spill_index[j] = src; |
7214 | SET_HARD_REG_BIT (reg_is_output_reload, src); | |
7215 | if (find_regno_note (insn, REG_DEAD, src)) | |
7216 | SET_HARD_REG_BIT (reg_reloaded_died, src); | |
7217 | } | |
cb2afeb3 | 7218 | if (REGNO (reload_reg_rtx[j]) < FIRST_PSEUDO_REGISTER) |
9da46522 R |
7219 | { |
7220 | int s = reload_secondary_out_reload[j]; | |
cb2afeb3 | 7221 | set = single_set (p); |
9da46522 R |
7222 | /* If this reload copies only to the secondary reload |
7223 | register, the secondary reload does the actual | |
7224 | store. */ | |
7225 | if (s >= 0 && set == NULL_RTX) | |
7226 | ; /* We can't tell what function the secondary reload | |
7227 | has and where the actual store to the pseudo is | |
7228 | made; leave new_spill_reg_store alone. */ | |
7229 | else if (s >= 0 | |
7230 | && SET_SRC (set) == reload_reg_rtx[j] | |
7231 | && SET_DEST (set) == reload_reg_rtx[s]) | |
7232 | { | |
7233 | /* Usually the next instruction will be the | |
7234 | secondary reload insn; if we can confirm | |
7235 | that it is, setting new_spill_reg_store to | |
7236 | that insn will allow an extra optimization. */ | |
7237 | rtx s_reg = reload_reg_rtx[s]; | |
7238 | rtx next = NEXT_INSN (p); | |
7239 | reload_out[s] = reload_out[j]; | |
cb2afeb3 | 7240 | reload_out_reg[s] = reload_out_reg[j]; |
9da46522 R |
7241 | set = single_set (next); |
7242 | if (set && SET_SRC (set) == s_reg | |
7243 | && ! new_spill_reg_store[REGNO (s_reg)]) | |
cb2afeb3 R |
7244 | { |
7245 | SET_HARD_REG_BIT (reg_is_output_reload, | |
7246 | REGNO (s_reg)); | |
7247 | new_spill_reg_store[REGNO (s_reg)] = next; | |
7248 | } | |
9da46522 R |
7249 | } |
7250 | else | |
cb2afeb3 | 7251 | new_spill_reg_store[REGNO (reload_reg_rtx[j])] = p; |
9da46522 | 7252 | } |
e6e52be0 | 7253 | } |
32131a9c RK |
7254 | } |
7255 | ||
d7e0324f | 7256 | if (reload_when_needed[j] == RELOAD_OTHER) |
befa01b9 JW |
7257 | { |
7258 | emit_insns (other_output_reload_insns[reload_opnum[j]]); | |
7259 | other_output_reload_insns[reload_opnum[j]] = get_insns (); | |
7260 | } | |
7261 | else | |
7262 | output_reload_insns[reload_opnum[j]] = get_insns (); | |
d7e0324f | 7263 | |
546b63fb | 7264 | end_sequence (); |
32131a9c | 7265 | } |
32131a9c RK |
7266 | } |
7267 | ||
546b63fb RK |
7268 | /* Now write all the insns we made for reloads in the order expected by |
7269 | the allocation functions. Prior to the insn being reloaded, we write | |
7270 | the following reloads: | |
7271 | ||
7272 | RELOAD_FOR_OTHER_ADDRESS reloads for input addresses. | |
7273 | ||
2edc8d65 | 7274 | RELOAD_OTHER reloads. |
546b63fb | 7275 | |
47c8cf91 ILT |
7276 | For each operand, any RELOAD_FOR_INPADDR_ADDRESS reloads followed |
7277 | by any RELOAD_FOR_INPUT_ADDRESS reloads followed by the | |
7278 | RELOAD_FOR_INPUT reload for the operand. | |
546b63fb | 7279 | |
893bc853 RK |
7280 | RELOAD_FOR_OPADDR_ADDRS reloads. |
7281 | ||
546b63fb RK |
7282 | RELOAD_FOR_OPERAND_ADDRESS reloads. |
7283 | ||
7284 | After the insn being reloaded, we write the following: | |
7285 | ||
47c8cf91 ILT |
7286 | For each operand, any RELOAD_FOR_OUTADDR_ADDRESS reloads followed |
7287 | by any RELOAD_FOR_OUTPUT_ADDRESS reload followed by the | |
7288 | RELOAD_FOR_OUTPUT reload, followed by any RELOAD_OTHER output | |
7289 | reloads for the operand. The RELOAD_OTHER output reloads are | |
7290 | output in descending order by reload number. */ | |
546b63fb | 7291 | |
c93b03c2 RH |
7292 | emit_insns_before (other_input_address_reload_insns, insn); |
7293 | emit_insns_before (other_input_reload_insns, insn); | |
546b63fb RK |
7294 | |
7295 | for (j = 0; j < reload_n_operands; j++) | |
7296 | { | |
c93b03c2 RH |
7297 | emit_insns_before (inpaddr_address_reload_insns[j], insn); |
7298 | emit_insns_before (input_address_reload_insns[j], insn); | |
7299 | emit_insns_before (input_reload_insns[j], insn); | |
546b63fb RK |
7300 | } |
7301 | ||
c93b03c2 RH |
7302 | emit_insns_before (other_operand_reload_insns, insn); |
7303 | emit_insns_before (operand_reload_insns, insn); | |
546b63fb RK |
7304 | |
7305 | for (j = 0; j < reload_n_operands; j++) | |
7306 | { | |
47c8cf91 | 7307 | emit_insns_before (outaddr_address_reload_insns[j], following_insn); |
546b63fb RK |
7308 | emit_insns_before (output_address_reload_insns[j], following_insn); |
7309 | emit_insns_before (output_reload_insns[j], following_insn); | |
befa01b9 | 7310 | emit_insns_before (other_output_reload_insns[j], following_insn); |
c93b03c2 RH |
7311 | } |
7312 | ||
7313 | /* Keep basic block info up to date. */ | |
7314 | if (n_basic_blocks) | |
7315 | { | |
7609e720 BS |
7316 | if (basic_block_head[chain->block] == insn) |
7317 | basic_block_head[chain->block] = NEXT_INSN (before_insn); | |
7318 | if (basic_block_end[chain->block] == insn) | |
7319 | basic_block_end[chain->block] = PREV_INSN (following_insn); | |
546b63fb RK |
7320 | } |
7321 | ||
32131a9c RK |
7322 | /* For all the spill regs newly reloaded in this instruction, |
7323 | record what they were reloaded from, so subsequent instructions | |
d445b551 RK |
7324 | can inherit the reloads. |
7325 | ||
7326 | Update spill_reg_store for the reloads of this insn. | |
e9e79d69 | 7327 | Copy the elements that were updated in the loop above. */ |
32131a9c RK |
7328 | |
7329 | for (j = 0; j < n_reloads; j++) | |
7330 | { | |
7331 | register int r = reload_order[j]; | |
7332 | register int i = reload_spill_index[r]; | |
7333 | ||
e6e52be0 | 7334 | /* I is nonneg if this reload used a register. |
32131a9c | 7335 | If reload_reg_rtx[r] is 0, this is an optional reload |
51f0c3b7 | 7336 | that we opted to ignore. */ |
d445b551 | 7337 | |
51f0c3b7 | 7338 | if (i >= 0 && reload_reg_rtx[r] != 0) |
32131a9c | 7339 | { |
32131a9c | 7340 | int nr |
e6e52be0 | 7341 | = HARD_REGNO_NREGS (i, GET_MODE (reload_reg_rtx[r])); |
32131a9c | 7342 | int k; |
51f0c3b7 JW |
7343 | int part_reaches_end = 0; |
7344 | int all_reaches_end = 1; | |
32131a9c | 7345 | |
51f0c3b7 JW |
7346 | /* For a multi register reload, we need to check if all or part |
7347 | of the value lives to the end. */ | |
32131a9c RK |
7348 | for (k = 0; k < nr; k++) |
7349 | { | |
e6e52be0 | 7350 | if (reload_reg_reaches_end_p (i + k, reload_opnum[r], |
51f0c3b7 JW |
7351 | reload_when_needed[r])) |
7352 | part_reaches_end = 1; | |
7353 | else | |
7354 | all_reaches_end = 0; | |
32131a9c RK |
7355 | } |
7356 | ||
51f0c3b7 JW |
7357 | /* Ignore reloads that don't reach the end of the insn in |
7358 | entirety. */ | |
7359 | if (all_reaches_end) | |
32131a9c | 7360 | { |
51f0c3b7 JW |
7361 | /* First, clear out memory of what used to be in this spill reg. |
7362 | If consecutive registers are used, clear them all. */ | |
d08ea79f | 7363 | |
32131a9c | 7364 | for (k = 0; k < nr; k++) |
e6e52be0 | 7365 | CLEAR_HARD_REG_BIT (reg_reloaded_valid, i + k); |
d08ea79f | 7366 | |
51f0c3b7 | 7367 | /* Maybe the spill reg contains a copy of reload_out. */ |
cb2afeb3 R |
7368 | if (reload_out[r] != 0 |
7369 | && (GET_CODE (reload_out[r]) == REG | |
7370 | #ifdef AUTO_INC_DEC | |
7371 | || ! reload_out_reg[r] | |
7372 | #endif | |
7373 | || GET_CODE (reload_out_reg[r]) == REG)) | |
51f0c3b7 | 7374 | { |
cb2afeb3 R |
7375 | rtx out = (GET_CODE (reload_out[r]) == REG |
7376 | ? reload_out[r] | |
7377 | : reload_out_reg[r] | |
7378 | ? reload_out_reg[r] | |
7379 | /* AUTO_INC */ : XEXP (reload_in_reg[r], 0)); | |
7380 | register int nregno = REGNO (out); | |
51f0c3b7 JW |
7381 | int nnr = (nregno >= FIRST_PSEUDO_REGISTER ? 1 |
7382 | : HARD_REGNO_NREGS (nregno, | |
7383 | GET_MODE (reload_reg_rtx[r]))); | |
7384 | ||
7385 | spill_reg_store[i] = new_spill_reg_store[i]; | |
cb2afeb3 | 7386 | spill_reg_stored_to[i] = out; |
51f0c3b7 JW |
7387 | reg_last_reload_reg[nregno] = reload_reg_rtx[r]; |
7388 | ||
7389 | /* If NREGNO is a hard register, it may occupy more than | |
7390 | one register. If it does, say what is in the | |
7391 | rest of the registers assuming that both registers | |
7392 | agree on how many words the object takes. If not, | |
7393 | invalidate the subsequent registers. */ | |
7394 | ||
7395 | if (nregno < FIRST_PSEUDO_REGISTER) | |
7396 | for (k = 1; k < nnr; k++) | |
7397 | reg_last_reload_reg[nregno + k] | |
7398 | = (nr == nnr | |
38a448ca RH |
7399 | ? gen_rtx_REG (reg_raw_mode[REGNO (reload_reg_rtx[r]) + k], |
7400 | REGNO (reload_reg_rtx[r]) + k) | |
51f0c3b7 JW |
7401 | : 0); |
7402 | ||
7403 | /* Now do the inverse operation. */ | |
7404 | for (k = 0; k < nr; k++) | |
7405 | { | |
e6e52be0 R |
7406 | CLEAR_HARD_REG_BIT (reg_reloaded_dead, i + k); |
7407 | reg_reloaded_contents[i + k] | |
51f0c3b7 JW |
7408 | = (nregno >= FIRST_PSEUDO_REGISTER || nr != nnr |
7409 | ? nregno | |
7410 | : nregno + k); | |
e6e52be0 R |
7411 | reg_reloaded_insn[i + k] = insn; |
7412 | SET_HARD_REG_BIT (reg_reloaded_valid, i + k); | |
51f0c3b7 JW |
7413 | } |
7414 | } | |
d08ea79f | 7415 | |
51f0c3b7 JW |
7416 | /* Maybe the spill reg contains a copy of reload_in. Only do |
7417 | something if there will not be an output reload for | |
7418 | the register being reloaded. */ | |
cb2afeb3 | 7419 | else if (reload_out_reg[r] == 0 |
51f0c3b7 JW |
7420 | && reload_in[r] != 0 |
7421 | && ((GET_CODE (reload_in[r]) == REG | |
cb2afeb3 | 7422 | && REGNO (reload_in[r]) >= FIRST_PSEUDO_REGISTER |
51f0c3b7 JW |
7423 | && ! reg_has_output_reload[REGNO (reload_in[r])]) |
7424 | || (GET_CODE (reload_in_reg[r]) == REG | |
cb2afeb3 R |
7425 | && ! reg_has_output_reload[REGNO (reload_in_reg[r])])) |
7426 | && ! reg_set_p (reload_reg_rtx[r], PATTERN (insn))) | |
51f0c3b7 JW |
7427 | { |
7428 | register int nregno; | |
7429 | int nnr; | |
d445b551 | 7430 | |
cb2afeb3 R |
7431 | if (GET_CODE (reload_in[r]) == REG |
7432 | && REGNO (reload_in[r]) >= FIRST_PSEUDO_REGISTER) | |
51f0c3b7 | 7433 | nregno = REGNO (reload_in[r]); |
cb2afeb3 | 7434 | else if (GET_CODE (reload_in_reg[r]) == REG) |
51f0c3b7 | 7435 | nregno = REGNO (reload_in_reg[r]); |
cb2afeb3 R |
7436 | else |
7437 | nregno = REGNO (XEXP (reload_in_reg[r], 0)); | |
d08ea79f | 7438 | |
51f0c3b7 JW |
7439 | nnr = (nregno >= FIRST_PSEUDO_REGISTER ? 1 |
7440 | : HARD_REGNO_NREGS (nregno, | |
7441 | GET_MODE (reload_reg_rtx[r]))); | |
7442 | ||
7443 | reg_last_reload_reg[nregno] = reload_reg_rtx[r]; | |
7444 | ||
7445 | if (nregno < FIRST_PSEUDO_REGISTER) | |
7446 | for (k = 1; k < nnr; k++) | |
7447 | reg_last_reload_reg[nregno + k] | |
7448 | = (nr == nnr | |
38a448ca RH |
7449 | ? gen_rtx_REG (reg_raw_mode[REGNO (reload_reg_rtx[r]) + k], |
7450 | REGNO (reload_reg_rtx[r]) + k) | |
51f0c3b7 JW |
7451 | : 0); |
7452 | ||
7453 | /* Unless we inherited this reload, show we haven't | |
cb2afeb3 R |
7454 | recently done a store. |
7455 | Previous stores of inherited auto_inc expressions | |
7456 | also have to be discarded. */ | |
7457 | if (! reload_inherited[r] | |
7458 | || (reload_out[r] && ! reload_out_reg[r])) | |
51f0c3b7 JW |
7459 | spill_reg_store[i] = 0; |
7460 | ||
7461 | for (k = 0; k < nr; k++) | |
7462 | { | |
e6e52be0 R |
7463 | CLEAR_HARD_REG_BIT (reg_reloaded_dead, i + k); |
7464 | reg_reloaded_contents[i + k] | |
51f0c3b7 JW |
7465 | = (nregno >= FIRST_PSEUDO_REGISTER || nr != nnr |
7466 | ? nregno | |
7467 | : nregno + k); | |
e6e52be0 R |
7468 | reg_reloaded_insn[i + k] = insn; |
7469 | SET_HARD_REG_BIT (reg_reloaded_valid, i + k); | |
51f0c3b7 JW |
7470 | } |
7471 | } | |
7472 | } | |
d445b551 | 7473 | |
51f0c3b7 JW |
7474 | /* However, if part of the reload reaches the end, then we must |
7475 | invalidate the old info for the part that survives to the end. */ | |
7476 | else if (part_reaches_end) | |
7477 | { | |
546b63fb | 7478 | for (k = 0; k < nr; k++) |
e6e52be0 | 7479 | if (reload_reg_reaches_end_p (i + k, |
51f0c3b7 JW |
7480 | reload_opnum[r], |
7481 | reload_when_needed[r])) | |
e6e52be0 | 7482 | CLEAR_HARD_REG_BIT (reg_reloaded_valid, i + k); |
32131a9c RK |
7483 | } |
7484 | } | |
7485 | ||
7486 | /* The following if-statement was #if 0'd in 1.34 (or before...). | |
7487 | It's reenabled in 1.35 because supposedly nothing else | |
7488 | deals with this problem. */ | |
7489 | ||
7490 | /* If a register gets output-reloaded from a non-spill register, | |
7491 | that invalidates any previous reloaded copy of it. | |
7492 | But forget_old_reloads_1 won't get to see it, because | |
7493 | it thinks only about the original insn. So invalidate it here. */ | |
cb2afeb3 R |
7494 | if (i < 0 && reload_out[r] != 0 |
7495 | && (GET_CODE (reload_out[r]) == REG | |
7496 | || (GET_CODE (reload_out[r]) == MEM | |
7497 | && GET_CODE (reload_out_reg[r]) == REG))) | |
32131a9c | 7498 | { |
cb2afeb3 R |
7499 | rtx out = (GET_CODE (reload_out[r]) == REG |
7500 | ? reload_out[r] : reload_out_reg[r]); | |
7501 | register int nregno = REGNO (out); | |
c7093272 | 7502 | if (nregno >= FIRST_PSEUDO_REGISTER) |
cb2afeb3 R |
7503 | { |
7504 | rtx src_reg, store_insn; | |
7505 | ||
7506 | reg_last_reload_reg[nregno] = 0; | |
7507 | ||
7508 | /* If we can find a hard register that is stored, record | |
7509 | the storing insn so that we may delete this insn with | |
7510 | delete_output_reload. */ | |
7511 | src_reg = reload_reg_rtx[r]; | |
7512 | ||
7513 | /* If this is an optional reload, try to find the source reg | |
7514 | from an input reload. */ | |
7515 | if (! src_reg) | |
7516 | { | |
7517 | rtx set = single_set (insn); | |
7518 | if (SET_DEST (set) == reload_out[r]) | |
7519 | { | |
7520 | int k; | |
7521 | ||
7522 | src_reg = SET_SRC (set); | |
7523 | store_insn = insn; | |
7524 | for (k = 0; k < n_reloads; k++) | |
7525 | { | |
7526 | if (reload_in[k] == src_reg) | |
7527 | { | |
7528 | src_reg = reload_reg_rtx[k]; | |
7529 | break; | |
7530 | } | |
7531 | } | |
7532 | } | |
7533 | } | |
7534 | else | |
7535 | store_insn = new_spill_reg_store[REGNO (src_reg)]; | |
7536 | if (src_reg && GET_CODE (src_reg) == REG | |
7537 | && REGNO (src_reg) < FIRST_PSEUDO_REGISTER) | |
7538 | { | |
7539 | int src_regno = REGNO (src_reg); | |
7540 | int nr = HARD_REGNO_NREGS (src_regno, reload_mode[r]); | |
7541 | /* The place where to find a death note varies with | |
7542 | PRESERVE_DEATH_INFO_REGNO_P . The condition is not | |
7543 | necessarily checked exactly in the code that moves | |
7544 | notes, so just check both locations. */ | |
7545 | rtx note = find_regno_note (insn, REG_DEAD, src_regno); | |
7546 | if (! note) | |
7547 | note = find_regno_note (store_insn, REG_DEAD, src_regno); | |
7548 | while (nr-- > 0) | |
7549 | { | |
7550 | spill_reg_store[src_regno + nr] = store_insn; | |
7551 | spill_reg_stored_to[src_regno + nr] = out; | |
7552 | reg_reloaded_contents[src_regno + nr] = nregno; | |
7553 | reg_reloaded_insn[src_regno + nr] = store_insn; | |
7554 | SET_HARD_REG_BIT (reg_reloaded_valid, src_regno + nr); | |
7555 | SET_HARD_REG_BIT (reg_is_output_reload, src_regno + nr); | |
7556 | if (note) | |
7557 | SET_HARD_REG_BIT (reg_reloaded_died, src_regno); | |
7558 | else | |
7559 | CLEAR_HARD_REG_BIT (reg_reloaded_died, src_regno); | |
7560 | } | |
7561 | reg_last_reload_reg[nregno] = src_reg; | |
7562 | } | |
7563 | } | |
c7093272 RK |
7564 | else |
7565 | { | |
7566 | int num_regs = HARD_REGNO_NREGS (nregno,GET_MODE (reload_out[r])); | |
36281332 | 7567 | |
c7093272 RK |
7568 | while (num_regs-- > 0) |
7569 | reg_last_reload_reg[nregno + num_regs] = 0; | |
7570 | } | |
32131a9c RK |
7571 | } |
7572 | } | |
e6e52be0 | 7573 | IOR_HARD_REG_SET (reg_reloaded_dead, reg_reloaded_died); |
32131a9c RK |
7574 | } |
7575 | \f | |
5e03c156 RK |
7576 | /* Emit code to perform a reload from IN (which may be a reload register) to |
7577 | OUT (which may also be a reload register). IN or OUT is from operand | |
7578 | OPNUM with reload type TYPE. | |
546b63fb | 7579 | |
3c3eeea6 | 7580 | Returns first insn emitted. */ |
32131a9c RK |
7581 | |
7582 | rtx | |
5e03c156 RK |
7583 | gen_reload (out, in, opnum, type) |
7584 | rtx out; | |
32131a9c | 7585 | rtx in; |
546b63fb RK |
7586 | int opnum; |
7587 | enum reload_type type; | |
32131a9c | 7588 | { |
546b63fb | 7589 | rtx last = get_last_insn (); |
7a5b18b0 RK |
7590 | rtx tem; |
7591 | ||
7592 | /* If IN is a paradoxical SUBREG, remove it and try to put the | |
7593 | opposite SUBREG on OUT. Likewise for a paradoxical SUBREG on OUT. */ | |
7594 | if (GET_CODE (in) == SUBREG | |
7595 | && (GET_MODE_SIZE (GET_MODE (in)) | |
7596 | > GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))) | |
7597 | && (tem = gen_lowpart_common (GET_MODE (SUBREG_REG (in)), out)) != 0) | |
7598 | in = SUBREG_REG (in), out = tem; | |
7599 | else if (GET_CODE (out) == SUBREG | |
7600 | && (GET_MODE_SIZE (GET_MODE (out)) | |
7601 | > GET_MODE_SIZE (GET_MODE (SUBREG_REG (out)))) | |
7602 | && (tem = gen_lowpart_common (GET_MODE (SUBREG_REG (out)), in)) != 0) | |
7603 | out = SUBREG_REG (out), in = tem; | |
32131a9c | 7604 | |
a8fdc208 | 7605 | /* How to do this reload can get quite tricky. Normally, we are being |
32131a9c RK |
7606 | asked to reload a simple operand, such as a MEM, a constant, or a pseudo |
7607 | register that didn't get a hard register. In that case we can just | |
7608 | call emit_move_insn. | |
7609 | ||
a7fd196c JW |
7610 | We can also be asked to reload a PLUS that adds a register or a MEM to |
7611 | another register, constant or MEM. This can occur during frame pointer | |
7612 | elimination and while reloading addresses. This case is handled by | |
7613 | trying to emit a single insn to perform the add. If it is not valid, | |
7614 | we use a two insn sequence. | |
32131a9c RK |
7615 | |
7616 | Finally, we could be called to handle an 'o' constraint by putting | |
7617 | an address into a register. In that case, we first try to do this | |
7618 | with a named pattern of "reload_load_address". If no such pattern | |
7619 | exists, we just emit a SET insn and hope for the best (it will normally | |
7620 | be valid on machines that use 'o'). | |
7621 | ||
7622 | This entire process is made complex because reload will never | |
7623 | process the insns we generate here and so we must ensure that | |
7624 | they will fit their constraints and also by the fact that parts of | |
7625 | IN might be being reloaded separately and replaced with spill registers. | |
7626 | Because of this, we are, in some sense, just guessing the right approach | |
7627 | here. The one listed above seems to work. | |
7628 | ||
7629 | ??? At some point, this whole thing needs to be rethought. */ | |
7630 | ||
7631 | if (GET_CODE (in) == PLUS | |
a7fd196c | 7632 | && (GET_CODE (XEXP (in, 0)) == REG |
5c6b1bd2 | 7633 | || GET_CODE (XEXP (in, 0)) == SUBREG |
a7fd196c JW |
7634 | || GET_CODE (XEXP (in, 0)) == MEM) |
7635 | && (GET_CODE (XEXP (in, 1)) == REG | |
5c6b1bd2 | 7636 | || GET_CODE (XEXP (in, 1)) == SUBREG |
a7fd196c JW |
7637 | || CONSTANT_P (XEXP (in, 1)) |
7638 | || GET_CODE (XEXP (in, 1)) == MEM)) | |
32131a9c | 7639 | { |
a7fd196c JW |
7640 | /* We need to compute the sum of a register or a MEM and another |
7641 | register, constant, or MEM, and put it into the reload | |
3002e160 JW |
7642 | register. The best possible way of doing this is if the machine |
7643 | has a three-operand ADD insn that accepts the required operands. | |
32131a9c RK |
7644 | |
7645 | The simplest approach is to try to generate such an insn and see if it | |
7646 | is recognized and matches its constraints. If so, it can be used. | |
7647 | ||
7648 | It might be better not to actually emit the insn unless it is valid, | |
0009eff2 | 7649 | but we need to pass the insn as an operand to `recog' and |
b36d7dd7 | 7650 | `insn_extract' and it is simpler to emit and then delete the insn if |
0009eff2 | 7651 | not valid than to dummy things up. */ |
a8fdc208 | 7652 | |
af929c62 | 7653 | rtx op0, op1, tem, insn; |
32131a9c | 7654 | int code; |
a8fdc208 | 7655 | |
af929c62 RK |
7656 | op0 = find_replacement (&XEXP (in, 0)); |
7657 | op1 = find_replacement (&XEXP (in, 1)); | |
7658 | ||
32131a9c RK |
7659 | /* Since constraint checking is strict, commutativity won't be |
7660 | checked, so we need to do that here to avoid spurious failure | |
7661 | if the add instruction is two-address and the second operand | |
7662 | of the add is the same as the reload reg, which is frequently | |
7663 | the case. If the insn would be A = B + A, rearrange it so | |
0f41302f | 7664 | it will be A = A + B as constrain_operands expects. */ |
a8fdc208 | 7665 | |
32131a9c | 7666 | if (GET_CODE (XEXP (in, 1)) == REG |
5e03c156 | 7667 | && REGNO (out) == REGNO (XEXP (in, 1))) |
af929c62 RK |
7668 | tem = op0, op0 = op1, op1 = tem; |
7669 | ||
7670 | if (op0 != XEXP (in, 0) || op1 != XEXP (in, 1)) | |
38a448ca | 7671 | in = gen_rtx_PLUS (GET_MODE (in), op0, op1); |
32131a9c | 7672 | |
38a448ca | 7673 | insn = emit_insn (gen_rtx_SET (VOIDmode, out, in)); |
32131a9c RK |
7674 | code = recog_memoized (insn); |
7675 | ||
7676 | if (code >= 0) | |
7677 | { | |
7678 | insn_extract (insn); | |
7679 | /* We want constrain operands to treat this insn strictly in | |
7680 | its validity determination, i.e., the way it would after reload | |
7681 | has completed. */ | |
7682 | if (constrain_operands (code, 1)) | |
7683 | return insn; | |
7684 | } | |
7685 | ||
546b63fb | 7686 | delete_insns_since (last); |
32131a9c RK |
7687 | |
7688 | /* If that failed, we must use a conservative two-insn sequence. | |
7689 | use move to copy constant, MEM, or pseudo register to the reload | |
af929c62 RK |
7690 | register since "move" will be able to handle an arbitrary operand, |
7691 | unlike add which can't, in general. Then add the registers. | |
32131a9c RK |
7692 | |
7693 | If there is another way to do this for a specific machine, a | |
7694 | DEFINE_PEEPHOLE should be specified that recognizes the sequence | |
7695 | we emit below. */ | |
7696 | ||
5c6b1bd2 | 7697 | if (CONSTANT_P (op1) || GET_CODE (op1) == MEM || GET_CODE (op1) == SUBREG |
af929c62 RK |
7698 | || (GET_CODE (op1) == REG |
7699 | && REGNO (op1) >= FIRST_PSEUDO_REGISTER)) | |
7700 | tem = op0, op0 = op1, op1 = tem; | |
32131a9c | 7701 | |
5c6b1bd2 | 7702 | gen_reload (out, op0, opnum, type); |
39b56c2a | 7703 | |
5e03c156 | 7704 | /* If OP0 and OP1 are the same, we can use OUT for OP1. |
39b56c2a RK |
7705 | This fixes a problem on the 32K where the stack pointer cannot |
7706 | be used as an operand of an add insn. */ | |
7707 | ||
7708 | if (rtx_equal_p (op0, op1)) | |
5e03c156 | 7709 | op1 = out; |
39b56c2a | 7710 | |
5e03c156 | 7711 | insn = emit_insn (gen_add2_insn (out, op1)); |
c77c9766 RK |
7712 | |
7713 | /* If that failed, copy the address register to the reload register. | |
0f41302f | 7714 | Then add the constant to the reload register. */ |
c77c9766 RK |
7715 | |
7716 | code = recog_memoized (insn); | |
7717 | ||
7718 | if (code >= 0) | |
7719 | { | |
7720 | insn_extract (insn); | |
7721 | /* We want constrain operands to treat this insn strictly in | |
7722 | its validity determination, i.e., the way it would after reload | |
7723 | has completed. */ | |
7724 | if (constrain_operands (code, 1)) | |
4117a96b R |
7725 | { |
7726 | /* Add a REG_EQUIV note so that find_equiv_reg can find it. */ | |
7727 | REG_NOTES (insn) | |
9e6a5703 | 7728 | = gen_rtx_EXPR_LIST (REG_EQUIV, in, REG_NOTES (insn)); |
4117a96b R |
7729 | return insn; |
7730 | } | |
c77c9766 RK |
7731 | } |
7732 | ||
7733 | delete_insns_since (last); | |
7734 | ||
5c6b1bd2 | 7735 | gen_reload (out, op1, opnum, type); |
4117a96b | 7736 | insn = emit_insn (gen_add2_insn (out, op0)); |
9e6a5703 | 7737 | REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUIV, in, REG_NOTES (insn)); |
32131a9c RK |
7738 | } |
7739 | ||
0dadecf6 RK |
7740 | #ifdef SECONDARY_MEMORY_NEEDED |
7741 | /* If we need a memory location to do the move, do it that way. */ | |
7742 | else if (GET_CODE (in) == REG && REGNO (in) < FIRST_PSEUDO_REGISTER | |
5e03c156 | 7743 | && GET_CODE (out) == REG && REGNO (out) < FIRST_PSEUDO_REGISTER |
0dadecf6 | 7744 | && SECONDARY_MEMORY_NEEDED (REGNO_REG_CLASS (REGNO (in)), |
5e03c156 RK |
7745 | REGNO_REG_CLASS (REGNO (out)), |
7746 | GET_MODE (out))) | |
0dadecf6 RK |
7747 | { |
7748 | /* Get the memory to use and rewrite both registers to its mode. */ | |
5e03c156 | 7749 | rtx loc = get_secondary_mem (in, GET_MODE (out), opnum, type); |
0dadecf6 | 7750 | |
5e03c156 | 7751 | if (GET_MODE (loc) != GET_MODE (out)) |
38a448ca | 7752 | out = gen_rtx_REG (GET_MODE (loc), REGNO (out)); |
0dadecf6 RK |
7753 | |
7754 | if (GET_MODE (loc) != GET_MODE (in)) | |
38a448ca | 7755 | in = gen_rtx_REG (GET_MODE (loc), REGNO (in)); |
0dadecf6 | 7756 | |
5c6b1bd2 RK |
7757 | gen_reload (loc, in, opnum, type); |
7758 | gen_reload (out, loc, opnum, type); | |
0dadecf6 RK |
7759 | } |
7760 | #endif | |
7761 | ||
32131a9c RK |
7762 | /* If IN is a simple operand, use gen_move_insn. */ |
7763 | else if (GET_RTX_CLASS (GET_CODE (in)) == 'o' || GET_CODE (in) == SUBREG) | |
5e03c156 | 7764 | emit_insn (gen_move_insn (out, in)); |
32131a9c RK |
7765 | |
7766 | #ifdef HAVE_reload_load_address | |
7767 | else if (HAVE_reload_load_address) | |
5e03c156 | 7768 | emit_insn (gen_reload_load_address (out, in)); |
32131a9c RK |
7769 | #endif |
7770 | ||
5e03c156 | 7771 | /* Otherwise, just write (set OUT IN) and hope for the best. */ |
32131a9c | 7772 | else |
38a448ca | 7773 | emit_insn (gen_rtx_SET (VOIDmode, out, in)); |
32131a9c RK |
7774 | |
7775 | /* Return the first insn emitted. | |
546b63fb | 7776 | We can not just return get_last_insn, because there may have |
32131a9c RK |
7777 | been multiple instructions emitted. Also note that gen_move_insn may |
7778 | emit more than one insn itself, so we can not assume that there is one | |
7779 | insn emitted per emit_insn_before call. */ | |
7780 | ||
546b63fb | 7781 | return last ? NEXT_INSN (last) : get_insns (); |
32131a9c RK |
7782 | } |
7783 | \f | |
7784 | /* Delete a previously made output-reload | |
7785 | whose result we now believe is not needed. | |
7786 | First we double-check. | |
7787 | ||
7788 | INSN is the insn now being processed. | |
cb2afeb3 R |
7789 | LAST_RELOAD_REG is the hard register number for which we want to delete |
7790 | the last output reload. | |
7791 | J is the reload-number that originally used REG. The caller has made | |
7792 | certain that reload J doesn't use REG any longer for input. */ | |
32131a9c RK |
7793 | |
7794 | static void | |
cb2afeb3 | 7795 | delete_output_reload (insn, j, last_reload_reg) |
32131a9c RK |
7796 | rtx insn; |
7797 | int j; | |
cb2afeb3 | 7798 | int last_reload_reg; |
32131a9c | 7799 | { |
cb2afeb3 R |
7800 | rtx output_reload_insn = spill_reg_store[last_reload_reg]; |
7801 | rtx reg = spill_reg_stored_to[last_reload_reg]; | |
7802 | int k; | |
7803 | int n_occurrences; | |
7804 | int n_inherited = 0; | |
32131a9c | 7805 | register rtx i1; |
cb2afeb3 R |
7806 | rtx substed; |
7807 | ||
32131a9c RK |
7808 | /* Get the raw pseudo-register referred to. */ |
7809 | ||
32131a9c RK |
7810 | while (GET_CODE (reg) == SUBREG) |
7811 | reg = SUBREG_REG (reg); | |
cb2afeb3 R |
7812 | substed = reg_equiv_memory_loc[REGNO (reg)]; |
7813 | ||
7814 | /* This is unsafe if the operand occurs more often in the current | |
7815 | insn than it is inherited. */ | |
7816 | for (k = n_reloads - 1; k >= 0; k--) | |
7817 | { | |
7818 | rtx reg2 = reload_in[k]; | |
7819 | if (! reg2) | |
7820 | continue; | |
7821 | if (GET_CODE (reg2) == MEM || reload_override_in[k]) | |
7822 | reg2 = reload_in_reg[k]; | |
7823 | #ifdef AUTO_INC_DEC | |
7824 | if (reload_out[k] && ! reload_out_reg[k]) | |
7825 | reg2 = XEXP (reload_in_reg[k], 0); | |
7826 | #endif | |
7827 | while (GET_CODE (reg2) == SUBREG) | |
7828 | reg2 = SUBREG_REG (reg2); | |
7829 | if (rtx_equal_p (reg2, reg)) | |
2eb6dac7 AS |
7830 | { |
7831 | if (reload_inherited[k] || reload_override_in[k] || k == j) | |
7832 | { | |
cb2afeb3 | 7833 | n_inherited++; |
2eb6dac7 AS |
7834 | reg2 = reload_out_reg[k]; |
7835 | if (! reg2) | |
7836 | continue; | |
7837 | while (GET_CODE (reg2) == SUBREG) | |
7838 | reg2 = XEXP (reg2, 0); | |
7839 | if (rtx_equal_p (reg2, reg)) | |
7840 | n_inherited++; | |
7841 | } | |
7842 | else | |
7843 | return; | |
7844 | } | |
cb2afeb3 R |
7845 | } |
7846 | n_occurrences = count_occurrences (PATTERN (insn), reg); | |
7847 | if (substed) | |
7848 | n_occurrences += count_occurrences (PATTERN (insn), substed); | |
7849 | if (n_occurrences > n_inherited) | |
7850 | return; | |
32131a9c RK |
7851 | |
7852 | /* If the pseudo-reg we are reloading is no longer referenced | |
7853 | anywhere between the store into it and here, | |
7854 | and no jumps or labels intervene, then the value can get | |
7855 | here through the reload reg alone. | |
7856 | Otherwise, give up--return. */ | |
7857 | for (i1 = NEXT_INSN (output_reload_insn); | |
7858 | i1 != insn; i1 = NEXT_INSN (i1)) | |
7859 | { | |
7860 | if (GET_CODE (i1) == CODE_LABEL || GET_CODE (i1) == JUMP_INSN) | |
7861 | return; | |
7862 | if ((GET_CODE (i1) == INSN || GET_CODE (i1) == CALL_INSN) | |
7863 | && reg_mentioned_p (reg, PATTERN (i1))) | |
aa6498c2 | 7864 | { |
cb2afeb3 R |
7865 | /* If this is USE in front of INSN, we only have to check that |
7866 | there are no more references than accounted for by inheritance. */ | |
7867 | while (GET_CODE (i1) == INSN && GET_CODE (PATTERN (i1)) == USE) | |
aa6498c2 | 7868 | { |
cb2afeb3 | 7869 | n_occurrences += rtx_equal_p (reg, XEXP (PATTERN (i1), 0)) != 0; |
aa6498c2 R |
7870 | i1 = NEXT_INSN (i1); |
7871 | } | |
cb2afeb3 | 7872 | if (n_occurrences <= n_inherited && i1 == insn) |
aa6498c2 R |
7873 | break; |
7874 | return; | |
7875 | } | |
32131a9c RK |
7876 | } |
7877 | ||
aa6498c2 R |
7878 | /* The caller has already checked that REG dies or is set in INSN. |
7879 | It has also checked that we are optimizing, and thus some inaccurancies | |
7880 | in the debugging information are acceptable. | |
7881 | So we could just delete output_reload_insn. | |
7882 | But in some cases we can improve the debugging information without | |
7883 | sacrificing optimization - maybe even improving the code: | |
7884 | See if the pseudo reg has been completely replaced | |
32131a9c RK |
7885 | with reload regs. If so, delete the store insn |
7886 | and forget we had a stack slot for the pseudo. */ | |
aa6498c2 R |
7887 | if (reload_out[j] != reload_in[j] |
7888 | && REG_N_DEATHS (REGNO (reg)) == 1 | |
7889 | && REG_BASIC_BLOCK (REGNO (reg)) >= 0 | |
7890 | && find_regno_note (insn, REG_DEAD, REGNO (reg))) | |
32131a9c RK |
7891 | { |
7892 | rtx i2; | |
7893 | ||
7894 | /* We know that it was used only between here | |
7895 | and the beginning of the current basic block. | |
7896 | (We also know that the last use before INSN was | |
7897 | the output reload we are thinking of deleting, but never mind that.) | |
7898 | Search that range; see if any ref remains. */ | |
7899 | for (i2 = PREV_INSN (insn); i2; i2 = PREV_INSN (i2)) | |
7900 | { | |
d445b551 RK |
7901 | rtx set = single_set (i2); |
7902 | ||
32131a9c RK |
7903 | /* Uses which just store in the pseudo don't count, |
7904 | since if they are the only uses, they are dead. */ | |
d445b551 | 7905 | if (set != 0 && SET_DEST (set) == reg) |
32131a9c RK |
7906 | continue; |
7907 | if (GET_CODE (i2) == CODE_LABEL | |
7908 | || GET_CODE (i2) == JUMP_INSN) | |
7909 | break; | |
7910 | if ((GET_CODE (i2) == INSN || GET_CODE (i2) == CALL_INSN) | |
7911 | && reg_mentioned_p (reg, PATTERN (i2))) | |
aa6498c2 R |
7912 | { |
7913 | /* Some other ref remains; just delete the output reload we | |
7914 | know to be dead. */ | |
cb2afeb3 R |
7915 | delete_address_reloads (output_reload_insn, insn); |
7916 | PUT_CODE (output_reload_insn, NOTE); | |
7917 | NOTE_SOURCE_FILE (output_reload_insn) = 0; | |
7918 | NOTE_LINE_NUMBER (output_reload_insn) = NOTE_INSN_DELETED; | |
aa6498c2 R |
7919 | return; |
7920 | } | |
32131a9c RK |
7921 | } |
7922 | ||
7923 | /* Delete the now-dead stores into this pseudo. */ | |
7924 | for (i2 = PREV_INSN (insn); i2; i2 = PREV_INSN (i2)) | |
7925 | { | |
d445b551 RK |
7926 | rtx set = single_set (i2); |
7927 | ||
7928 | if (set != 0 && SET_DEST (set) == reg) | |
5507b94b | 7929 | { |
cb2afeb3 | 7930 | delete_address_reloads (i2, insn); |
5507b94b RK |
7931 | /* This might be a basic block head, |
7932 | thus don't use delete_insn. */ | |
7933 | PUT_CODE (i2, NOTE); | |
7934 | NOTE_SOURCE_FILE (i2) = 0; | |
7935 | NOTE_LINE_NUMBER (i2) = NOTE_INSN_DELETED; | |
7936 | } | |
32131a9c RK |
7937 | if (GET_CODE (i2) == CODE_LABEL |
7938 | || GET_CODE (i2) == JUMP_INSN) | |
7939 | break; | |
7940 | } | |
7941 | ||
7942 | /* For the debugging info, | |
7943 | say the pseudo lives in this reload reg. */ | |
7944 | reg_renumber[REGNO (reg)] = REGNO (reload_reg_rtx[j]); | |
7945 | alter_reg (REGNO (reg), -1); | |
7946 | } | |
cb2afeb3 R |
7947 | delete_address_reloads (output_reload_insn, insn); |
7948 | PUT_CODE (output_reload_insn, NOTE); | |
7949 | NOTE_SOURCE_FILE (output_reload_insn) = 0; | |
7950 | NOTE_LINE_NUMBER (output_reload_insn) = NOTE_INSN_DELETED; | |
7951 | ||
7952 | } | |
7953 | ||
7954 | /* We are going to delete DEAD_INSN. Recursively delete loads of | |
7955 | reload registers used in DEAD_INSN that are not used till CURRENT_INSN. | |
7956 | CURRENT_INSN is being reloaded, so we have to check its reloads too. */ | |
7957 | static void | |
7958 | delete_address_reloads (dead_insn, current_insn) | |
7959 | rtx dead_insn, current_insn; | |
7960 | { | |
7961 | rtx set = single_set (dead_insn); | |
7962 | rtx set2, dst, prev, next; | |
7963 | if (set) | |
7964 | { | |
7965 | rtx dst = SET_DEST (set); | |
7966 | if (GET_CODE (dst) == MEM) | |
7967 | delete_address_reloads_1 (dead_insn, XEXP (dst, 0), current_insn); | |
7968 | } | |
7969 | /* If we deleted the store from a reloaded post_{in,de}c expression, | |
7970 | we can delete the matching adds. */ | |
7971 | prev = PREV_INSN (dead_insn); | |
7972 | next = NEXT_INSN (dead_insn); | |
7973 | if (! prev || ! next) | |
7974 | return; | |
7975 | set = single_set (next); | |
7976 | set2 = single_set (prev); | |
7977 | if (! set || ! set2 | |
7978 | || GET_CODE (SET_SRC (set)) != PLUS || GET_CODE (SET_SRC (set2)) != PLUS | |
7979 | || GET_CODE (XEXP (SET_SRC (set), 1)) != CONST_INT | |
7980 | || GET_CODE (XEXP (SET_SRC (set2), 1)) != CONST_INT) | |
7981 | return; | |
7982 | dst = SET_DEST (set); | |
7983 | if (! rtx_equal_p (dst, SET_DEST (set2)) | |
7984 | || ! rtx_equal_p (dst, XEXP (SET_SRC (set), 0)) | |
7985 | || ! rtx_equal_p (dst, XEXP (SET_SRC (set2), 0)) | |
7986 | || (INTVAL (XEXP (SET_SRC (set), 1)) | |
7987 | != - INTVAL (XEXP (SET_SRC (set2), 1)))) | |
7988 | return; | |
7989 | delete_insn (prev); | |
7990 | delete_insn (next); | |
7991 | } | |
7992 | ||
7993 | /* Subfunction of delete_address_reloads: process registers found in X. */ | |
7994 | static void | |
7995 | delete_address_reloads_1 (dead_insn, x, current_insn) | |
7996 | rtx dead_insn, x, current_insn; | |
7997 | { | |
7998 | rtx prev, set, dst, i2; | |
7999 | int i, j; | |
8000 | enum rtx_code code = GET_CODE (x); | |
8001 | ||
8002 | if (code != REG) | |
8003 | { | |
8004 | char *fmt= GET_RTX_FORMAT (code); | |
8005 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
8006 | { | |
8007 | if (fmt[i] == 'e') | |
8008 | delete_address_reloads_1 (dead_insn, XEXP (x, i), current_insn); | |
8009 | else if (fmt[i] == 'E') | |
8010 | { | |
8011 | for (j = XVECLEN (x, i) - 1; j >=0; j--) | |
8012 | delete_address_reloads_1 (dead_insn, XVECEXP (x, i, j), | |
8013 | current_insn); | |
8014 | } | |
8015 | } | |
8016 | return; | |
8017 | } | |
8018 | ||
8019 | if (spill_reg_order[REGNO (x)] < 0) | |
8020 | return; | |
aa6498c2 | 8021 | |
cb2afeb3 R |
8022 | /* Scan backwards for the insn that sets x. This might be a way back due |
8023 | to inheritance. */ | |
8024 | for (prev = PREV_INSN (dead_insn); prev; prev = PREV_INSN (prev)) | |
8025 | { | |
8026 | code = GET_CODE (prev); | |
8027 | if (code == CODE_LABEL || code == JUMP_INSN) | |
8028 | return; | |
8029 | if (GET_RTX_CLASS (code) != 'i') | |
8030 | continue; | |
8031 | if (reg_set_p (x, PATTERN (prev))) | |
8032 | break; | |
8033 | if (reg_referenced_p (x, PATTERN (prev))) | |
8034 | return; | |
8035 | } | |
8036 | if (! prev || INSN_UID (prev) < reload_first_uid) | |
8037 | return; | |
8038 | /* Check that PREV only sets the reload register. */ | |
8039 | set = single_set (prev); | |
8040 | if (! set) | |
8041 | return; | |
8042 | dst = SET_DEST (set); | |
8043 | if (GET_CODE (dst) != REG | |
8044 | || ! rtx_equal_p (dst, x)) | |
8045 | return; | |
8046 | if (! reg_set_p (dst, PATTERN (dead_insn))) | |
8047 | { | |
8048 | /* Check if DST was used in a later insn - | |
8049 | it might have been inherited. */ | |
8050 | for (i2 = NEXT_INSN (dead_insn); i2; i2 = NEXT_INSN (i2)) | |
8051 | { | |
8052 | if (GET_CODE (i2) == CODE_LABEL) | |
8053 | break; | |
8054 | if (GET_RTX_CLASS (GET_CODE (i2)) != 'i') | |
8055 | continue; | |
8056 | if (reg_referenced_p (dst, PATTERN (i2))) | |
8057 | { | |
8058 | /* If there is a reference to the register in the current insn, | |
8059 | it might be loaded in a non-inherited reload. If no other | |
8060 | reload uses it, that means the register is set before | |
8061 | referenced. */ | |
8062 | if (i2 == current_insn) | |
8063 | { | |
8064 | for (j = n_reloads - 1; j >= 0; j--) | |
8065 | if ((reload_reg_rtx[j] == dst && reload_inherited[j]) | |
8066 | || reload_override_in[j] == dst) | |
8067 | return; | |
8068 | for (j = n_reloads - 1; j >= 0; j--) | |
8069 | if (reload_in[j] && reload_reg_rtx[j] == dst) | |
8070 | break; | |
8071 | if (j >= 0) | |
8072 | break; | |
8073 | } | |
8074 | return; | |
8075 | } | |
8076 | if (GET_CODE (i2) == JUMP_INSN) | |
8077 | break; | |
8078 | if (reg_set_p (dst, PATTERN (i2))) | |
8079 | break; | |
8080 | /* If DST is still live at CURRENT_INSN, check if it is used for | |
8081 | any reload. */ | |
8082 | if (i2 == current_insn) | |
8083 | { | |
8084 | for (j = n_reloads - 1; j >= 0; j--) | |
8085 | if ((reload_reg_rtx[j] == dst && reload_inherited[j]) | |
8086 | || reload_override_in[j] == dst) | |
8087 | return; | |
8088 | /* ??? We can't finish the loop here, because dst might be | |
8089 | allocated to a pseudo in this block if no reload in this | |
8090 | block needs any of the clsses containing DST - see | |
8091 | spill_hard_reg. There is no easy way to tell this, so we | |
8092 | have to scan till the end of the basic block. */ | |
8093 | } | |
8094 | } | |
8095 | } | |
8096 | delete_address_reloads_1 (prev, SET_SRC (set), current_insn); | |
8097 | reg_reloaded_contents[REGNO (dst)] = -1; | |
8098 | /* Can't use delete_insn here because PREV might be a basic block head. */ | |
8099 | PUT_CODE (prev, NOTE); | |
8100 | NOTE_LINE_NUMBER (prev) = NOTE_INSN_DELETED; | |
8101 | NOTE_SOURCE_FILE (prev) = 0; | |
32131a9c | 8102 | } |
32131a9c | 8103 | \f |
a8fdc208 | 8104 | /* Output reload-insns to reload VALUE into RELOADREG. |
858a47b1 | 8105 | VALUE is an autoincrement or autodecrement RTX whose operand |
32131a9c RK |
8106 | is a register or memory location; |
8107 | so reloading involves incrementing that location. | |
cb2afeb3 | 8108 | IN is either identical to VALUE, or some cheaper place to reload from. |
32131a9c RK |
8109 | |
8110 | INC_AMOUNT is the number to increment or decrement by (always positive). | |
cb2afeb3 | 8111 | This cannot be deduced from VALUE. |
32131a9c | 8112 | |
cb2afeb3 R |
8113 | Return the instruction that stores into RELOADREG. */ |
8114 | ||
8115 | static rtx | |
8116 | inc_for_reload (reloadreg, in, value, inc_amount) | |
32131a9c | 8117 | rtx reloadreg; |
cb2afeb3 | 8118 | rtx in, value; |
32131a9c | 8119 | int inc_amount; |
32131a9c RK |
8120 | { |
8121 | /* REG or MEM to be copied and incremented. */ | |
8122 | rtx incloc = XEXP (value, 0); | |
8123 | /* Nonzero if increment after copying. */ | |
8124 | int post = (GET_CODE (value) == POST_DEC || GET_CODE (value) == POST_INC); | |
546b63fb | 8125 | rtx last; |
0009eff2 RK |
8126 | rtx inc; |
8127 | rtx add_insn; | |
8128 | int code; | |
cb2afeb3 R |
8129 | rtx store; |
8130 | rtx real_in = in == value ? XEXP (in, 0) : in; | |
32131a9c RK |
8131 | |
8132 | /* No hard register is equivalent to this register after | |
8133 | inc/dec operation. If REG_LAST_RELOAD_REG were non-zero, | |
8134 | we could inc/dec that register as well (maybe even using it for | |
8135 | the source), but I'm not sure it's worth worrying about. */ | |
8136 | if (GET_CODE (incloc) == REG) | |
8137 | reg_last_reload_reg[REGNO (incloc)] = 0; | |
8138 | ||
8139 | if (GET_CODE (value) == PRE_DEC || GET_CODE (value) == POST_DEC) | |
8140 | inc_amount = - inc_amount; | |
8141 | ||
fb3821f7 | 8142 | inc = GEN_INT (inc_amount); |
0009eff2 RK |
8143 | |
8144 | /* If this is post-increment, first copy the location to the reload reg. */ | |
cb2afeb3 R |
8145 | if (post && real_in != reloadreg) |
8146 | emit_insn (gen_move_insn (reloadreg, real_in)); | |
0009eff2 | 8147 | |
cb2afeb3 R |
8148 | if (in == value) |
8149 | { | |
8150 | /* See if we can directly increment INCLOC. Use a method similar to | |
8151 | that in gen_reload. */ | |
0009eff2 | 8152 | |
cb2afeb3 R |
8153 | last = get_last_insn (); |
8154 | add_insn = emit_insn (gen_rtx_SET (VOIDmode, incloc, | |
8155 | gen_rtx_PLUS (GET_MODE (incloc), | |
8156 | incloc, inc))); | |
0009eff2 | 8157 | |
cb2afeb3 R |
8158 | code = recog_memoized (add_insn); |
8159 | if (code >= 0) | |
32131a9c | 8160 | { |
cb2afeb3 R |
8161 | insn_extract (add_insn); |
8162 | if (constrain_operands (code, 1)) | |
8163 | { | |
8164 | /* If this is a pre-increment and we have incremented the value | |
8165 | where it lives, copy the incremented value to RELOADREG to | |
8166 | be used as an address. */ | |
0009eff2 | 8167 | |
cb2afeb3 R |
8168 | if (! post) |
8169 | emit_insn (gen_move_insn (reloadreg, incloc)); | |
546b63fb | 8170 | |
cb2afeb3 R |
8171 | return add_insn; |
8172 | } | |
32131a9c | 8173 | } |
cb2afeb3 | 8174 | delete_insns_since (last); |
32131a9c | 8175 | } |
0009eff2 | 8176 | |
0009eff2 RK |
8177 | /* If couldn't do the increment directly, must increment in RELOADREG. |
8178 | The way we do this depends on whether this is pre- or post-increment. | |
8179 | For pre-increment, copy INCLOC to the reload register, increment it | |
8180 | there, then save back. */ | |
8181 | ||
8182 | if (! post) | |
8183 | { | |
cb2afeb3 R |
8184 | if (in != reloadreg) |
8185 | emit_insn (gen_move_insn (reloadreg, real_in)); | |
546b63fb | 8186 | emit_insn (gen_add2_insn (reloadreg, inc)); |
cb2afeb3 | 8187 | store = emit_insn (gen_move_insn (incloc, reloadreg)); |
0009eff2 | 8188 | } |
32131a9c RK |
8189 | else |
8190 | { | |
0009eff2 RK |
8191 | /* Postincrement. |
8192 | Because this might be a jump insn or a compare, and because RELOADREG | |
8193 | may not be available after the insn in an input reload, we must do | |
8194 | the incrementation before the insn being reloaded for. | |
8195 | ||
cb2afeb3 | 8196 | We have already copied IN to RELOADREG. Increment the copy in |
0009eff2 RK |
8197 | RELOADREG, save that back, then decrement RELOADREG so it has |
8198 | the original value. */ | |
8199 | ||
546b63fb | 8200 | emit_insn (gen_add2_insn (reloadreg, inc)); |
cb2afeb3 | 8201 | store = emit_insn (gen_move_insn (incloc, reloadreg)); |
546b63fb | 8202 | emit_insn (gen_add2_insn (reloadreg, GEN_INT (-inc_amount))); |
32131a9c | 8203 | } |
0009eff2 | 8204 | |
cb2afeb3 | 8205 | return store; |
32131a9c RK |
8206 | } |
8207 | \f | |
8208 | /* Return 1 if we are certain that the constraint-string STRING allows | |
8209 | the hard register REG. Return 0 if we can't be sure of this. */ | |
8210 | ||
8211 | static int | |
8212 | constraint_accepts_reg_p (string, reg) | |
8213 | char *string; | |
8214 | rtx reg; | |
8215 | { | |
8216 | int value = 0; | |
8217 | int regno = true_regnum (reg); | |
8218 | int c; | |
8219 | ||
8220 | /* Initialize for first alternative. */ | |
8221 | value = 0; | |
8222 | /* Check that each alternative contains `g' or `r'. */ | |
8223 | while (1) | |
8224 | switch (c = *string++) | |
8225 | { | |
8226 | case 0: | |
8227 | /* If an alternative lacks `g' or `r', we lose. */ | |
8228 | return value; | |
8229 | case ',': | |
8230 | /* If an alternative lacks `g' or `r', we lose. */ | |
8231 | if (value == 0) | |
8232 | return 0; | |
8233 | /* Initialize for next alternative. */ | |
8234 | value = 0; | |
8235 | break; | |
8236 | case 'g': | |
8237 | case 'r': | |
8238 | /* Any general reg wins for this alternative. */ | |
8239 | if (TEST_HARD_REG_BIT (reg_class_contents[(int) GENERAL_REGS], regno)) | |
8240 | value = 1; | |
8241 | break; | |
8242 | default: | |
8243 | /* Any reg in specified class wins for this alternative. */ | |
8244 | { | |
0009eff2 | 8245 | enum reg_class class = REG_CLASS_FROM_LETTER (c); |
32131a9c | 8246 | |
0009eff2 | 8247 | if (TEST_HARD_REG_BIT (reg_class_contents[(int) class], regno)) |
32131a9c RK |
8248 | value = 1; |
8249 | } | |
8250 | } | |
8251 | } | |
8252 | \f | |
d445b551 RK |
8253 | /* Return the number of places FIND appears within X, but don't count |
8254 | an occurrence if some SET_DEST is FIND. */ | |
32131a9c | 8255 | |
184bb750 | 8256 | int |
32131a9c RK |
8257 | count_occurrences (x, find) |
8258 | register rtx x, find; | |
8259 | { | |
8260 | register int i, j; | |
8261 | register enum rtx_code code; | |
8262 | register char *format_ptr; | |
8263 | int count; | |
8264 | ||
8265 | if (x == find) | |
8266 | return 1; | |
8267 | if (x == 0) | |
8268 | return 0; | |
8269 | ||
8270 | code = GET_CODE (x); | |
8271 | ||
8272 | switch (code) | |
8273 | { | |
8274 | case REG: | |
8275 | case QUEUED: | |
8276 | case CONST_INT: | |
8277 | case CONST_DOUBLE: | |
8278 | case SYMBOL_REF: | |
8279 | case CODE_LABEL: | |
8280 | case PC: | |
8281 | case CC0: | |
8282 | return 0; | |
d445b551 | 8283 | |
cb2afeb3 R |
8284 | case MEM: |
8285 | if (GET_CODE (find) == MEM && rtx_equal_p (x, find)) | |
8286 | return 1; | |
8287 | break; | |
d445b551 RK |
8288 | case SET: |
8289 | if (SET_DEST (x) == find) | |
8290 | return count_occurrences (SET_SRC (x), find); | |
8291 | break; | |
e9a25f70 JL |
8292 | |
8293 | default: | |
8294 | break; | |
32131a9c RK |
8295 | } |
8296 | ||
8297 | format_ptr = GET_RTX_FORMAT (code); | |
8298 | count = 0; | |
8299 | ||
8300 | for (i = 0; i < GET_RTX_LENGTH (code); i++) | |
8301 | { | |
8302 | switch (*format_ptr++) | |
8303 | { | |
8304 | case 'e': | |
8305 | count += count_occurrences (XEXP (x, i), find); | |
8306 | break; | |
8307 | ||
8308 | case 'E': | |
8309 | if (XVEC (x, i) != NULL) | |
8310 | { | |
8311 | for (j = 0; j < XVECLEN (x, i); j++) | |
8312 | count += count_occurrences (XVECEXP (x, i, j), find); | |
8313 | } | |
8314 | break; | |
8315 | } | |
8316 | } | |
8317 | return count; | |
8318 | } | |
2a9fb548 ILT |
8319 | \f |
8320 | /* This array holds values which are equivalent to a hard register | |
8321 | during reload_cse_regs. Each array element is an EXPR_LIST of | |
8322 | values. Each time a hard register is set, we set the corresponding | |
8323 | array element to the value. Each time a hard register is copied | |
8324 | into memory, we add the memory location to the corresponding array | |
8325 | element. We don't store values or memory addresses with side | |
8326 | effects in this array. | |
8327 | ||
8328 | If the value is a CONST_INT, then the mode of the containing | |
8329 | EXPR_LIST is the mode in which that CONST_INT was referenced. | |
8330 | ||
8331 | We sometimes clobber a specific entry in a list. In that case, we | |
8332 | just set XEXP (list-entry, 0) to 0. */ | |
8333 | ||
8334 | static rtx *reg_values; | |
8335 | ||
ba325eba ILT |
8336 | /* This is a preallocated REG rtx which we use as a temporary in |
8337 | reload_cse_invalidate_regno, so that we don't need to allocate a | |
8338 | new one each time through a loop in that function. */ | |
8339 | ||
8340 | static rtx invalidate_regno_rtx; | |
8341 | ||
2a9fb548 ILT |
8342 | /* Invalidate any entries in reg_values which depend on REGNO, |
8343 | including those for REGNO itself. This is called if REGNO is | |
8344 | changing. If CLOBBER is true, then always forget anything we | |
8345 | currently know about REGNO. MODE is the mode of the assignment to | |
8346 | REGNO, which is used to determine how many hard registers are being | |
8347 | changed. If MODE is VOIDmode, then only REGNO is being changed; | |
8348 | this is used when invalidating call clobbered registers across a | |
8349 | call. */ | |
8350 | ||
8351 | static void | |
8352 | reload_cse_invalidate_regno (regno, mode, clobber) | |
8353 | int regno; | |
8354 | enum machine_mode mode; | |
8355 | int clobber; | |
8356 | { | |
8357 | int endregno; | |
8358 | register int i; | |
8359 | ||
8360 | /* Our callers don't always go through true_regnum; we may see a | |
8361 | pseudo-register here from a CLOBBER or the like. We probably | |
8362 | won't ever see a pseudo-register that has a real register number, | |
8363 | for we check anyhow for safety. */ | |
8364 | if (regno >= FIRST_PSEUDO_REGISTER) | |
8365 | regno = reg_renumber[regno]; | |
8366 | if (regno < 0) | |
8367 | return; | |
8368 | ||
8369 | if (mode == VOIDmode) | |
8370 | endregno = regno + 1; | |
8371 | else | |
8372 | endregno = regno + HARD_REGNO_NREGS (regno, mode); | |
8373 | ||
8374 | if (clobber) | |
8375 | for (i = regno; i < endregno; i++) | |
8376 | reg_values[i] = 0; | |
8377 | ||
8378 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
8379 | { | |
8380 | rtx x; | |
8381 | ||
8382 | for (x = reg_values[i]; x; x = XEXP (x, 1)) | |
8383 | { | |
8384 | if (XEXP (x, 0) != 0 | |
9e148ceb | 8385 | && refers_to_regno_p (regno, endregno, XEXP (x, 0), NULL_PTR)) |
2a9fb548 ILT |
8386 | { |
8387 | /* If this is the only entry on the list, clear | |
8388 | reg_values[i]. Otherwise, just clear this entry on | |
8389 | the list. */ | |
8390 | if (XEXP (x, 1) == 0 && x == reg_values[i]) | |
8391 | { | |
8392 | reg_values[i] = 0; | |
8393 | break; | |
8394 | } | |
8395 | XEXP (x, 0) = 0; | |
8396 | } | |
8397 | } | |
8398 | } | |
ba325eba ILT |
8399 | |
8400 | /* We must look at earlier registers, in case REGNO is part of a | |
8401 | multi word value but is not the first register. If an earlier | |
8402 | register has a value in a mode which overlaps REGNO, then we must | |
8403 | invalidate that earlier register. Note that we do not need to | |
8404 | check REGNO or later registers (we must not check REGNO itself, | |
8405 | because we would incorrectly conclude that there was a conflict). */ | |
8406 | ||
8407 | for (i = 0; i < regno; i++) | |
8408 | { | |
8409 | rtx x; | |
8410 | ||
8411 | for (x = reg_values[i]; x; x = XEXP (x, 1)) | |
8412 | { | |
8413 | if (XEXP (x, 0) != 0) | |
8414 | { | |
dbd7556e | 8415 | PUT_MODE (invalidate_regno_rtx, GET_MODE (x)); |
ba325eba ILT |
8416 | REGNO (invalidate_regno_rtx) = i; |
8417 | if (refers_to_regno_p (regno, endregno, invalidate_regno_rtx, | |
8418 | NULL_PTR)) | |
8419 | { | |
8420 | reload_cse_invalidate_regno (i, VOIDmode, 1); | |
8421 | break; | |
8422 | } | |
8423 | } | |
8424 | } | |
8425 | } | |
2a9fb548 ILT |
8426 | } |
8427 | ||
866aa3b6 DE |
8428 | /* The memory at address MEM_BASE is being changed. |
8429 | Return whether this change will invalidate VAL. */ | |
2a9fb548 ILT |
8430 | |
8431 | static int | |
cbfc3ad3 | 8432 | reload_cse_mem_conflict_p (mem_base, val) |
2a9fb548 | 8433 | rtx mem_base; |
2a9fb548 ILT |
8434 | rtx val; |
8435 | { | |
8436 | enum rtx_code code; | |
8437 | char *fmt; | |
8438 | int i; | |
8439 | ||
8440 | code = GET_CODE (val); | |
8441 | switch (code) | |
8442 | { | |
8443 | /* Get rid of a few simple cases quickly. */ | |
8444 | case REG: | |
2a9fb548 ILT |
8445 | case PC: |
8446 | case CC0: | |
8447 | case SCRATCH: | |
8448 | case CONST: | |
8449 | case CONST_INT: | |
8450 | case CONST_DOUBLE: | |
8451 | case SYMBOL_REF: | |
8452 | case LABEL_REF: | |
8453 | return 0; | |
8454 | ||
8455 | case MEM: | |
866aa3b6 DE |
8456 | if (GET_MODE (mem_base) == BLKmode |
8457 | || GET_MODE (val) == BLKmode) | |
8458 | return 1; | |
e9a25f70 JL |
8459 | if (anti_dependence (val, mem_base)) |
8460 | return 1; | |
8461 | /* The address may contain nested MEMs. */ | |
8462 | break; | |
2a9fb548 ILT |
8463 | |
8464 | default: | |
8465 | break; | |
8466 | } | |
8467 | ||
8468 | fmt = GET_RTX_FORMAT (code); | |
8469 | ||
8470 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
8471 | { | |
8472 | if (fmt[i] == 'e') | |
8473 | { | |
cbfc3ad3 | 8474 | if (reload_cse_mem_conflict_p (mem_base, XEXP (val, i))) |
2a9fb548 ILT |
8475 | return 1; |
8476 | } | |
8477 | else if (fmt[i] == 'E') | |
8478 | { | |
8479 | int j; | |
8480 | ||
8481 | for (j = 0; j < XVECLEN (val, i); j++) | |
cbfc3ad3 | 8482 | if (reload_cse_mem_conflict_p (mem_base, XVECEXP (val, i, j))) |
2a9fb548 ILT |
8483 | return 1; |
8484 | } | |
8485 | } | |
8486 | ||
8487 | return 0; | |
8488 | } | |
8489 | ||
8490 | /* Invalidate any entries in reg_values which are changed because of a | |
8491 | store to MEM_RTX. If this is called because of a non-const call | |
8492 | instruction, MEM_RTX is (mem:BLK const0_rtx). */ | |
8493 | ||
8494 | static void | |
8495 | reload_cse_invalidate_mem (mem_rtx) | |
8496 | rtx mem_rtx; | |
8497 | { | |
8498 | register int i; | |
2a9fb548 ILT |
8499 | |
8500 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
8501 | { | |
8502 | rtx x; | |
8503 | ||
8504 | for (x = reg_values[i]; x; x = XEXP (x, 1)) | |
8505 | { | |
8506 | if (XEXP (x, 0) != 0 | |
cbfc3ad3 | 8507 | && reload_cse_mem_conflict_p (mem_rtx, XEXP (x, 0))) |
2a9fb548 ILT |
8508 | { |
8509 | /* If this is the only entry on the list, clear | |
8510 | reg_values[i]. Otherwise, just clear this entry on | |
8511 | the list. */ | |
8512 | if (XEXP (x, 1) == 0 && x == reg_values[i]) | |
8513 | { | |
8514 | reg_values[i] = 0; | |
8515 | break; | |
8516 | } | |
8517 | XEXP (x, 0) = 0; | |
8518 | } | |
8519 | } | |
8520 | } | |
8521 | } | |
8522 | ||
8523 | /* Invalidate DEST, which is being assigned to or clobbered. The | |
8524 | second parameter exists so that this function can be passed to | |
8525 | note_stores; it is ignored. */ | |
8526 | ||
8527 | static void | |
8528 | reload_cse_invalidate_rtx (dest, ignore) | |
8529 | rtx dest; | |
487a6e06 | 8530 | rtx ignore ATTRIBUTE_UNUSED; |
2a9fb548 ILT |
8531 | { |
8532 | while (GET_CODE (dest) == STRICT_LOW_PART | |
8533 | || GET_CODE (dest) == SIGN_EXTRACT | |
8534 | || GET_CODE (dest) == ZERO_EXTRACT | |
8535 | || GET_CODE (dest) == SUBREG) | |
8536 | dest = XEXP (dest, 0); | |
8537 | ||
8538 | if (GET_CODE (dest) == REG) | |
8539 | reload_cse_invalidate_regno (REGNO (dest), GET_MODE (dest), 1); | |
8540 | else if (GET_CODE (dest) == MEM) | |
8541 | reload_cse_invalidate_mem (dest); | |
8542 | } | |
8543 | ||
8544 | /* Do a very simple CSE pass over the hard registers. | |
8545 | ||
8546 | This function detects no-op moves where we happened to assign two | |
8547 | different pseudo-registers to the same hard register, and then | |
8548 | copied one to the other. Reload will generate a useless | |
8549 | instruction copying a register to itself. | |
8550 | ||
8551 | This function also detects cases where we load a value from memory | |
8552 | into two different registers, and (if memory is more expensive than | |
8553 | registers) changes it to simply copy the first register into the | |
e9a25f70 JL |
8554 | second register. |
8555 | ||
8556 | Another optimization is performed that scans the operands of each | |
8557 | instruction to see whether the value is already available in a | |
8558 | hard register. It then replaces the operand with the hard register | |
8559 | if possible, much like an optional reload would. */ | |
2a9fb548 | 8560 | |
5adf6da0 R |
8561 | static void |
8562 | reload_cse_regs_1 (first) | |
2a9fb548 ILT |
8563 | rtx first; |
8564 | { | |
8565 | char *firstobj; | |
8566 | rtx callmem; | |
8567 | register int i; | |
8568 | rtx insn; | |
8569 | ||
cbfc3ad3 RK |
8570 | init_alias_analysis (); |
8571 | ||
2a9fb548 | 8572 | reg_values = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx)); |
e016950d | 8573 | bzero ((char *)reg_values, FIRST_PSEUDO_REGISTER * sizeof (rtx)); |
2a9fb548 ILT |
8574 | |
8575 | /* Create our EXPR_LIST structures on reload_obstack, so that we can | |
8576 | free them when we are done. */ | |
8577 | push_obstacks (&reload_obstack, &reload_obstack); | |
8578 | firstobj = (char *) obstack_alloc (&reload_obstack, 0); | |
8579 | ||
8580 | /* We pass this to reload_cse_invalidate_mem to invalidate all of | |
8581 | memory for a non-const call instruction. */ | |
38a448ca | 8582 | callmem = gen_rtx_MEM (BLKmode, const0_rtx); |
2a9fb548 | 8583 | |
ba325eba ILT |
8584 | /* This is used in reload_cse_invalidate_regno to avoid consing a |
8585 | new REG in a loop in that function. */ | |
38a448ca | 8586 | invalidate_regno_rtx = gen_rtx_REG (VOIDmode, 0); |
ba325eba | 8587 | |
2a9fb548 ILT |
8588 | for (insn = first; insn; insn = NEXT_INSN (insn)) |
8589 | { | |
8590 | rtx body; | |
8591 | ||
8592 | if (GET_CODE (insn) == CODE_LABEL) | |
8593 | { | |
8594 | /* Forget all the register values at a code label. We don't | |
8595 | try to do anything clever around jumps. */ | |
8596 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
8597 | reg_values[i] = 0; | |
8598 | ||
8599 | continue; | |
8600 | } | |
8601 | ||
8602 | #ifdef NON_SAVING_SETJMP | |
8603 | if (NON_SAVING_SETJMP && GET_CODE (insn) == NOTE | |
8604 | && NOTE_LINE_NUMBER (insn) == NOTE_INSN_SETJMP) | |
8605 | { | |
8606 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
8607 | reg_values[i] = 0; | |
8608 | ||
8609 | continue; | |
8610 | } | |
8611 | #endif | |
8612 | ||
8613 | if (GET_RTX_CLASS (GET_CODE (insn)) != 'i') | |
8614 | continue; | |
8615 | ||
8616 | /* If this is a call instruction, forget anything stored in a | |
8617 | call clobbered register, or, if this is not a const call, in | |
8618 | memory. */ | |
8619 | if (GET_CODE (insn) == CALL_INSN) | |
8620 | { | |
8621 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
8622 | if (call_used_regs[i]) | |
8623 | reload_cse_invalidate_regno (i, VOIDmode, 1); | |
8624 | ||
8625 | if (! CONST_CALL_P (insn)) | |
8626 | reload_cse_invalidate_mem (callmem); | |
8627 | } | |
8628 | ||
8629 | body = PATTERN (insn); | |
8630 | if (GET_CODE (body) == SET) | |
8631 | { | |
e9a25f70 | 8632 | int count = 0; |
31418d35 | 8633 | if (reload_cse_noop_set_p (body, insn)) |
2a9fb548 | 8634 | { |
54e89d25 R |
8635 | /* If this sets the return value of the function, we must keep |
8636 | a USE around, in case this is in a different basic block | |
8637 | than the final USE. Otherwise, we could loose important | |
8638 | register lifeness information on SMALL_REGISTER_CLASSES | |
8639 | machines, where return registers might be used as spills: | |
8640 | subsequent passes assume that spill registers are dead at | |
8641 | the end of a basic block. */ | |
8642 | if (REG_FUNCTION_VALUE_P (SET_DEST (body))) | |
8643 | { | |
8644 | pop_obstacks (); | |
8645 | PATTERN (insn) = gen_rtx_USE (VOIDmode, SET_DEST (body)); | |
8646 | INSN_CODE (insn) = -1; | |
8647 | REG_NOTES (insn) = NULL_RTX; | |
8648 | push_obstacks (&reload_obstack, &reload_obstack); | |
8649 | } | |
8650 | else | |
8651 | { | |
8652 | PUT_CODE (insn, NOTE); | |
8653 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
8654 | NOTE_SOURCE_FILE (insn) = 0; | |
8655 | } | |
2a9fb548 ILT |
8656 | |
8657 | /* We're done with this insn. */ | |
8658 | continue; | |
8659 | } | |
8660 | ||
e9a25f70 | 8661 | /* It's not a no-op, but we can try to simplify it. */ |
e9a25f70 JL |
8662 | count += reload_cse_simplify_set (body, insn); |
8663 | ||
6764d250 BS |
8664 | if (count > 0) |
8665 | apply_change_group (); | |
8666 | else | |
8667 | reload_cse_simplify_operands (insn); | |
e9a25f70 | 8668 | |
2a9fb548 ILT |
8669 | reload_cse_record_set (body, body); |
8670 | } | |
8671 | else if (GET_CODE (body) == PARALLEL) | |
8672 | { | |
e9a25f70 | 8673 | int count = 0; |
54e89d25 | 8674 | rtx value = NULL_RTX; |
2a9fb548 ILT |
8675 | |
8676 | /* If every action in a PARALLEL is a noop, we can delete | |
8677 | the entire PARALLEL. */ | |
8678 | for (i = XVECLEN (body, 0) - 1; i >= 0; --i) | |
54e89d25 R |
8679 | { |
8680 | rtx part = XVECEXP (body, 0, i); | |
8681 | if (GET_CODE (part) == SET) | |
8682 | { | |
8683 | if (! reload_cse_noop_set_p (part, insn)) | |
8684 | break; | |
8685 | if (REG_FUNCTION_VALUE_P (SET_DEST (part))) | |
8686 | { | |
8687 | if (value) | |
8688 | break; | |
8689 | value = SET_DEST (part); | |
8690 | } | |
8691 | } | |
8692 | else if (GET_CODE (part) != CLOBBER) | |
8693 | break; | |
8694 | } | |
2a9fb548 ILT |
8695 | if (i < 0) |
8696 | { | |
54e89d25 R |
8697 | if (value) |
8698 | { | |
8699 | pop_obstacks (); | |
8700 | PATTERN (insn) = gen_rtx_USE (VOIDmode, value); | |
8701 | INSN_CODE (insn) = -1; | |
8702 | REG_NOTES (insn) = NULL_RTX; | |
8703 | push_obstacks (&reload_obstack, &reload_obstack); | |
8704 | } | |
8705 | else | |
8706 | { | |
8707 | PUT_CODE (insn, NOTE); | |
8708 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
8709 | NOTE_SOURCE_FILE (insn) = 0; | |
8710 | } | |
2a9fb548 ILT |
8711 | |
8712 | /* We're done with this insn. */ | |
8713 | continue; | |
8714 | } | |
e9a25f70 JL |
8715 | |
8716 | /* It's not a no-op, but we can try to simplify it. */ | |
e9a25f70 JL |
8717 | for (i = XVECLEN (body, 0) - 1; i >= 0; --i) |
8718 | if (GET_CODE (XVECEXP (body, 0, i)) == SET) | |
8719 | count += reload_cse_simplify_set (XVECEXP (body, 0, i), insn); | |
8720 | ||
6764d250 BS |
8721 | if (count > 0) |
8722 | apply_change_group (); | |
8723 | else | |
8724 | reload_cse_simplify_operands (insn); | |
2a9fb548 ILT |
8725 | |
8726 | /* Look through the PARALLEL and record the values being | |
8727 | set, if possible. Also handle any CLOBBERs. */ | |
8728 | for (i = XVECLEN (body, 0) - 1; i >= 0; --i) | |
8729 | { | |
8730 | rtx x = XVECEXP (body, 0, i); | |
8731 | ||
8732 | if (GET_CODE (x) == SET) | |
8733 | reload_cse_record_set (x, body); | |
8734 | else | |
8735 | note_stores (x, reload_cse_invalidate_rtx); | |
8736 | } | |
8737 | } | |
8738 | else | |
8739 | note_stores (body, reload_cse_invalidate_rtx); | |
8740 | ||
8741 | #ifdef AUTO_INC_DEC | |
8742 | /* Clobber any registers which appear in REG_INC notes. We | |
8743 | could keep track of the changes to their values, but it is | |
8744 | unlikely to help. */ | |
8745 | { | |
8746 | rtx x; | |
8747 | ||
8748 | for (x = REG_NOTES (insn); x; x = XEXP (x, 1)) | |
8749 | if (REG_NOTE_KIND (x) == REG_INC) | |
8750 | reload_cse_invalidate_rtx (XEXP (x, 0), NULL_RTX); | |
8751 | } | |
8752 | #endif | |
8753 | ||
8754 | /* Look for any CLOBBERs in CALL_INSN_FUNCTION_USAGE, but only | |
8755 | after we have processed the insn. */ | |
8756 | if (GET_CODE (insn) == CALL_INSN) | |
8757 | { | |
8758 | rtx x; | |
8759 | ||
8760 | for (x = CALL_INSN_FUNCTION_USAGE (insn); x; x = XEXP (x, 1)) | |
8761 | if (GET_CODE (XEXP (x, 0)) == CLOBBER) | |
8762 | reload_cse_invalidate_rtx (XEXP (XEXP (x, 0), 0), NULL_RTX); | |
8763 | } | |
8764 | } | |
8765 | ||
8766 | /* Free all the temporary structures we created, and go back to the | |
8767 | regular obstacks. */ | |
8768 | obstack_free (&reload_obstack, firstobj); | |
8769 | pop_obstacks (); | |
8770 | } | |
8771 | ||
5adf6da0 R |
8772 | /* Call cse / combine like post-reload optimization phases. |
8773 | FIRST is the first instruction. */ | |
8774 | void | |
8775 | reload_cse_regs (first) | |
8776 | rtx first; | |
8777 | { | |
8778 | reload_cse_regs_1 (first); | |
8779 | reload_combine (); | |
8780 | reload_cse_move2add (first); | |
8781 | if (flag_expensive_optimizations) | |
8782 | reload_cse_regs_1 (first); | |
8783 | } | |
8784 | ||
2a9fb548 ILT |
8785 | /* Return whether the values known for REGNO are equal to VAL. MODE |
8786 | is the mode of the object that VAL is being copied to; this matters | |
8787 | if VAL is a CONST_INT. */ | |
8788 | ||
8789 | static int | |
8790 | reload_cse_regno_equal_p (regno, val, mode) | |
8791 | int regno; | |
8792 | rtx val; | |
8793 | enum machine_mode mode; | |
8794 | { | |
8795 | rtx x; | |
8796 | ||
8797 | if (val == 0) | |
8798 | return 0; | |
8799 | ||
8800 | for (x = reg_values[regno]; x; x = XEXP (x, 1)) | |
8801 | if (XEXP (x, 0) != 0 | |
8802 | && rtx_equal_p (XEXP (x, 0), val) | |
bb173ade RK |
8803 | && (! flag_float_store || GET_CODE (XEXP (x, 0)) != MEM |
8804 | || GET_MODE_CLASS (GET_MODE (x)) != MODE_FLOAT) | |
2a9fb548 ILT |
8805 | && (GET_CODE (val) != CONST_INT |
8806 | || mode == GET_MODE (x) | |
8807 | || (GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (x)) | |
6e848450 RK |
8808 | /* On a big endian machine if the value spans more than |
8809 | one register then this register holds the high part of | |
8810 | it and we can't use it. | |
8811 | ||
8812 | ??? We should also compare with the high part of the | |
8813 | value. */ | |
8814 | && !(WORDS_BIG_ENDIAN | |
8815 | && HARD_REGNO_NREGS (regno, GET_MODE (x)) > 1) | |
2a9fb548 ILT |
8816 | && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode), |
8817 | GET_MODE_BITSIZE (GET_MODE (x)))))) | |
8818 | return 1; | |
8819 | ||
8820 | return 0; | |
8821 | } | |
8822 | ||
31418d35 ILT |
8823 | /* See whether a single set is a noop. SET is the set instruction we |
8824 | are should check, and INSN is the instruction from which it came. */ | |
2a9fb548 ILT |
8825 | |
8826 | static int | |
31418d35 | 8827 | reload_cse_noop_set_p (set, insn) |
2a9fb548 | 8828 | rtx set; |
31418d35 | 8829 | rtx insn; |
2a9fb548 ILT |
8830 | { |
8831 | rtx src, dest; | |
8832 | enum machine_mode dest_mode; | |
8833 | int dreg, sreg; | |
31418d35 | 8834 | int ret; |
2a9fb548 ILT |
8835 | |
8836 | src = SET_SRC (set); | |
8837 | dest = SET_DEST (set); | |
8838 | dest_mode = GET_MODE (dest); | |
8839 | ||
8840 | if (side_effects_p (src)) | |
8841 | return 0; | |
8842 | ||
8843 | dreg = true_regnum (dest); | |
8844 | sreg = true_regnum (src); | |
8845 | ||
31418d35 ILT |
8846 | /* Check for setting a register to itself. In this case, we don't |
8847 | have to worry about REG_DEAD notes. */ | |
8848 | if (dreg >= 0 && dreg == sreg) | |
8849 | return 1; | |
8850 | ||
8851 | ret = 0; | |
2a9fb548 ILT |
8852 | if (dreg >= 0) |
8853 | { | |
8854 | /* Check for setting a register to itself. */ | |
8855 | if (dreg == sreg) | |
31418d35 | 8856 | ret = 1; |
2a9fb548 ILT |
8857 | |
8858 | /* Check for setting a register to a value which we already know | |
8859 | is in the register. */ | |
31418d35 ILT |
8860 | else if (reload_cse_regno_equal_p (dreg, src, dest_mode)) |
8861 | ret = 1; | |
2a9fb548 ILT |
8862 | |
8863 | /* Check for setting a register DREG to another register SREG | |
8864 | where SREG is equal to a value which is already in DREG. */ | |
31418d35 | 8865 | else if (sreg >= 0) |
2a9fb548 ILT |
8866 | { |
8867 | rtx x; | |
8868 | ||
8869 | for (x = reg_values[sreg]; x; x = XEXP (x, 1)) | |
31418d35 | 8870 | { |
99c2b71f ILT |
8871 | rtx tmp; |
8872 | ||
8873 | if (XEXP (x, 0) == 0) | |
8874 | continue; | |
8875 | ||
8876 | if (dest_mode == GET_MODE (x)) | |
8877 | tmp = XEXP (x, 0); | |
8878 | else if (GET_MODE_BITSIZE (dest_mode) | |
8879 | < GET_MODE_BITSIZE (GET_MODE (x))) | |
8880 | tmp = gen_lowpart_common (dest_mode, XEXP (x, 0)); | |
8881 | else | |
8882 | continue; | |
8883 | ||
8884 | if (tmp | |
8885 | && reload_cse_regno_equal_p (dreg, tmp, dest_mode)) | |
31418d35 ILT |
8886 | { |
8887 | ret = 1; | |
8888 | break; | |
8889 | } | |
8890 | } | |
2a9fb548 ILT |
8891 | } |
8892 | } | |
8893 | else if (GET_CODE (dest) == MEM) | |
8894 | { | |
8895 | /* Check for storing a register to memory when we know that the | |
8896 | register is equivalent to the memory location. */ | |
8897 | if (sreg >= 0 | |
8898 | && reload_cse_regno_equal_p (sreg, dest, dest_mode) | |
8899 | && ! side_effects_p (dest)) | |
31418d35 | 8900 | ret = 1; |
2a9fb548 ILT |
8901 | } |
8902 | ||
31418d35 | 8903 | return ret; |
2a9fb548 ILT |
8904 | } |
8905 | ||
8906 | /* Try to simplify a single SET instruction. SET is the set pattern. | |
e9a25f70 JL |
8907 | INSN is the instruction it came from. |
8908 | This function only handles one case: if we set a register to a value | |
8909 | which is not a register, we try to find that value in some other register | |
8910 | and change the set into a register copy. */ | |
2a9fb548 | 8911 | |
e9a25f70 | 8912 | static int |
2a9fb548 ILT |
8913 | reload_cse_simplify_set (set, insn) |
8914 | rtx set; | |
8915 | rtx insn; | |
8916 | { | |
8917 | int dreg; | |
8918 | rtx src; | |
8919 | enum machine_mode dest_mode; | |
8920 | enum reg_class dclass; | |
8921 | register int i; | |
8922 | ||
2a9fb548 ILT |
8923 | dreg = true_regnum (SET_DEST (set)); |
8924 | if (dreg < 0) | |
e9a25f70 | 8925 | return 0; |
2a9fb548 ILT |
8926 | |
8927 | src = SET_SRC (set); | |
8928 | if (side_effects_p (src) || true_regnum (src) >= 0) | |
e9a25f70 | 8929 | return 0; |
2a9fb548 | 8930 | |
cbd5b9a2 KR |
8931 | dclass = REGNO_REG_CLASS (dreg); |
8932 | ||
33ab8de0 | 8933 | /* If memory loads are cheaper than register copies, don't change them. */ |
cbd5b9a2 KR |
8934 | if (GET_CODE (src) == MEM |
8935 | && MEMORY_MOVE_COST (GET_MODE (src), dclass, 1) < 2) | |
e9a25f70 | 8936 | return 0; |
2a9fb548 | 8937 | |
0254c561 JC |
8938 | /* If the constant is cheaper than a register, don't change it. */ |
8939 | if (CONSTANT_P (src) | |
8940 | && rtx_cost (src, SET) < 2) | |
8941 | return 0; | |
8942 | ||
2a9fb548 | 8943 | dest_mode = GET_MODE (SET_DEST (set)); |
2a9fb548 ILT |
8944 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) |
8945 | { | |
8946 | if (i != dreg | |
8947 | && REGISTER_MOVE_COST (REGNO_REG_CLASS (i), dclass) == 2 | |
8948 | && reload_cse_regno_equal_p (i, src, dest_mode)) | |
8949 | { | |
8950 | int validated; | |
8951 | ||
8952 | /* Pop back to the real obstacks while changing the insn. */ | |
8953 | pop_obstacks (); | |
8954 | ||
8955 | validated = validate_change (insn, &SET_SRC (set), | |
38a448ca | 8956 | gen_rtx_REG (dest_mode, i), 1); |
2a9fb548 ILT |
8957 | |
8958 | /* Go back to the obstack we are using for temporary | |
8959 | storage. */ | |
8960 | push_obstacks (&reload_obstack, &reload_obstack); | |
8961 | ||
6764d250 BS |
8962 | if (validated) |
8963 | return 1; | |
e9a25f70 JL |
8964 | } |
8965 | } | |
8966 | return 0; | |
8967 | } | |
8968 | ||
8969 | /* Try to replace operands in INSN with equivalent values that are already | |
8970 | in registers. This can be viewed as optional reloading. | |
8971 | ||
8972 | For each non-register operand in the insn, see if any hard regs are | |
8973 | known to be equivalent to that operand. Record the alternatives which | |
8974 | can accept these hard registers. Among all alternatives, select the | |
8975 | ones which are better or equal to the one currently matching, where | |
8976 | "better" is in terms of '?' and '!' constraints. Among the remaining | |
8977 | alternatives, select the one which replaces most operands with | |
8978 | hard registers. */ | |
8979 | ||
8980 | static int | |
8981 | reload_cse_simplify_operands (insn) | |
8982 | rtx insn; | |
8983 | { | |
8984 | #ifdef REGISTER_CONSTRAINTS | |
8985 | int insn_code_number, n_operands, n_alternatives; | |
8986 | int i,j; | |
8987 | ||
8988 | char *constraints[MAX_RECOG_OPERANDS]; | |
8989 | ||
8990 | /* Vector recording how bad an alternative is. */ | |
8991 | int *alternative_reject; | |
8992 | /* Vector recording how many registers can be introduced by choosing | |
8993 | this alternative. */ | |
8994 | int *alternative_nregs; | |
8995 | /* Array of vectors recording, for each operand and each alternative, | |
8996 | which hard register to substitute, or -1 if the operand should be | |
8997 | left as it is. */ | |
8998 | int *op_alt_regno[MAX_RECOG_OPERANDS]; | |
8999 | /* Array of alternatives, sorted in order of decreasing desirability. */ | |
9000 | int *alternative_order; | |
0254c561 | 9001 | rtx reg = gen_rtx_REG (VOIDmode, -1); |
e9a25f70 JL |
9002 | |
9003 | /* Find out some information about this insn. */ | |
9004 | insn_code_number = recog_memoized (insn); | |
9005 | /* We don't modify asm instructions. */ | |
9006 | if (insn_code_number < 0) | |
9007 | return 0; | |
9008 | ||
9009 | n_operands = insn_n_operands[insn_code_number]; | |
9010 | n_alternatives = insn_n_alternatives[insn_code_number]; | |
9011 | ||
9012 | if (n_alternatives == 0 || n_operands == 0) | |
1d300e19 | 9013 | return 0; |
e9a25f70 JL |
9014 | insn_extract (insn); |
9015 | ||
9016 | /* Figure out which alternative currently matches. */ | |
9017 | if (! constrain_operands (insn_code_number, 1)) | |
b8705408 | 9018 | fatal_insn_not_found (insn); |
e9a25f70 JL |
9019 | |
9020 | alternative_reject = (int *) alloca (n_alternatives * sizeof (int)); | |
9021 | alternative_nregs = (int *) alloca (n_alternatives * sizeof (int)); | |
9022 | alternative_order = (int *) alloca (n_alternatives * sizeof (int)); | |
9023 | bzero ((char *)alternative_reject, n_alternatives * sizeof (int)); | |
9024 | bzero ((char *)alternative_nregs, n_alternatives * sizeof (int)); | |
9025 | ||
9026 | for (i = 0; i < n_operands; i++) | |
9027 | { | |
9028 | enum machine_mode mode; | |
9029 | int regno; | |
9030 | char *p; | |
9031 | ||
9032 | op_alt_regno[i] = (int *) alloca (n_alternatives * sizeof (int)); | |
9033 | for (j = 0; j < n_alternatives; j++) | |
9034 | op_alt_regno[i][j] = -1; | |
9035 | ||
9036 | p = constraints[i] = insn_operand_constraint[insn_code_number][i]; | |
9037 | mode = insn_operand_mode[insn_code_number][i]; | |
9038 | ||
9039 | /* Add the reject values for each alternative given by the constraints | |
9040 | for this operand. */ | |
9041 | j = 0; | |
9042 | while (*p != '\0') | |
9043 | { | |
9044 | char c = *p++; | |
9045 | if (c == ',') | |
9046 | j++; | |
9047 | else if (c == '?') | |
9048 | alternative_reject[j] += 3; | |
9049 | else if (c == '!') | |
9050 | alternative_reject[j] += 300; | |
9051 | } | |
9052 | ||
9053 | /* We won't change operands which are already registers. We | |
9054 | also don't want to modify output operands. */ | |
9055 | regno = true_regnum (recog_operand[i]); | |
9056 | if (regno >= 0 | |
9057 | || constraints[i][0] == '=' | |
9058 | || constraints[i][0] == '+') | |
9059 | continue; | |
9060 | ||
9061 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
9062 | { | |
9063 | int class = (int) NO_REGS; | |
9064 | ||
9065 | if (! reload_cse_regno_equal_p (regno, recog_operand[i], mode)) | |
9066 | continue; | |
9067 | ||
0254c561 JC |
9068 | REGNO (reg) = regno; |
9069 | PUT_MODE (reg, mode); | |
9070 | ||
e9a25f70 JL |
9071 | /* We found a register equal to this operand. Now look for all |
9072 | alternatives that can accept this register and have not been | |
9073 | assigned a register they can use yet. */ | |
9074 | j = 0; | |
9075 | p = constraints[i]; | |
9076 | for (;;) | |
31418d35 | 9077 | { |
e9a25f70 JL |
9078 | char c = *p++; |
9079 | ||
9080 | switch (c) | |
31418d35 | 9081 | { |
e9a25f70 JL |
9082 | case '=': case '+': case '?': |
9083 | case '#': case '&': case '!': | |
9084 | case '*': case '%': | |
9085 | case '0': case '1': case '2': case '3': case '4': | |
9086 | case 'm': case '<': case '>': case 'V': case 'o': | |
9087 | case 'E': case 'F': case 'G': case 'H': | |
9088 | case 's': case 'i': case 'n': | |
9089 | case 'I': case 'J': case 'K': case 'L': | |
9090 | case 'M': case 'N': case 'O': case 'P': | |
9091 | #ifdef EXTRA_CONSTRAINT | |
9092 | case 'Q': case 'R': case 'S': case 'T': case 'U': | |
9093 | #endif | |
9094 | case 'p': case 'X': | |
9095 | /* These don't say anything we care about. */ | |
9096 | break; | |
9097 | ||
9098 | case 'g': case 'r': | |
9099 | class = reg_class_subunion[(int) class][(int) GENERAL_REGS]; | |
9100 | break; | |
9101 | ||
9102 | default: | |
9103 | class | |
e51712db | 9104 | = reg_class_subunion[(int) class][(int) REG_CLASS_FROM_LETTER ((unsigned char)c)]; |
e9a25f70 | 9105 | break; |
31418d35 | 9106 | |
e9a25f70 JL |
9107 | case ',': case '\0': |
9108 | /* See if REGNO fits this alternative, and set it up as the | |
9109 | replacement register if we don't have one for this | |
0254c561 JC |
9110 | alternative yet and the operand being replaced is not |
9111 | a cheap CONST_INT. */ | |
e9a25f70 | 9112 | if (op_alt_regno[i][j] == -1 |
0254c561 JC |
9113 | && reg_fits_class_p (reg, class, 0, mode) |
9114 | && (GET_CODE (recog_operand[i]) != CONST_INT | |
9115 | || rtx_cost (recog_operand[i], SET) > rtx_cost (reg, SET))) | |
31418d35 | 9116 | { |
e9a25f70 JL |
9117 | alternative_nregs[j]++; |
9118 | op_alt_regno[i][j] = regno; | |
31418d35 | 9119 | } |
e9a25f70 JL |
9120 | j++; |
9121 | break; | |
31418d35 ILT |
9122 | } |
9123 | ||
e9a25f70 JL |
9124 | if (c == '\0') |
9125 | break; | |
9126 | } | |
9127 | } | |
9128 | } | |
9129 | ||
9130 | /* Record all alternatives which are better or equal to the currently | |
9131 | matching one in the alternative_order array. */ | |
9132 | for (i = j = 0; i < n_alternatives; i++) | |
9133 | if (alternative_reject[i] <= alternative_reject[which_alternative]) | |
9134 | alternative_order[j++] = i; | |
9135 | n_alternatives = j; | |
9136 | ||
9137 | /* Sort it. Given a small number of alternatives, a dumb algorithm | |
9138 | won't hurt too much. */ | |
9139 | for (i = 0; i < n_alternatives - 1; i++) | |
9140 | { | |
9141 | int best = i; | |
9142 | int best_reject = alternative_reject[alternative_order[i]]; | |
9143 | int best_nregs = alternative_nregs[alternative_order[i]]; | |
9144 | int tmp; | |
9145 | ||
9146 | for (j = i + 1; j < n_alternatives; j++) | |
9147 | { | |
9148 | int this_reject = alternative_reject[alternative_order[j]]; | |
9149 | int this_nregs = alternative_nregs[alternative_order[j]]; | |
9150 | ||
9151 | if (this_reject < best_reject | |
9152 | || (this_reject == best_reject && this_nregs < best_nregs)) | |
9153 | { | |
9154 | best = j; | |
9155 | best_reject = this_reject; | |
9156 | best_nregs = this_nregs; | |
31418d35 | 9157 | } |
2a9fb548 | 9158 | } |
e9a25f70 JL |
9159 | |
9160 | tmp = alternative_order[best]; | |
9161 | alternative_order[best] = alternative_order[i]; | |
9162 | alternative_order[i] = tmp; | |
9163 | } | |
9164 | ||
9165 | /* Substitute the operands as determined by op_alt_regno for the best | |
9166 | alternative. */ | |
9167 | j = alternative_order[0]; | |
e9a25f70 JL |
9168 | |
9169 | /* Pop back to the real obstacks while changing the insn. */ | |
9170 | pop_obstacks (); | |
9171 | ||
9172 | for (i = 0; i < n_operands; i++) | |
9173 | { | |
9174 | enum machine_mode mode = insn_operand_mode[insn_code_number][i]; | |
9175 | if (op_alt_regno[i][j] == -1) | |
9176 | continue; | |
9177 | ||
e9a25f70 | 9178 | validate_change (insn, recog_operand_loc[i], |
38a448ca | 9179 | gen_rtx_REG (mode, op_alt_regno[i][j]), 1); |
e9a25f70 JL |
9180 | } |
9181 | ||
9182 | for (i = insn_n_dups[insn_code_number] - 1; i >= 0; i--) | |
9183 | { | |
9184 | int op = recog_dup_num[i]; | |
9185 | enum machine_mode mode = insn_operand_mode[insn_code_number][op]; | |
9186 | ||
9187 | if (op_alt_regno[op][j] == -1) | |
9188 | continue; | |
9189 | ||
e9a25f70 | 9190 | validate_change (insn, recog_dup_loc[i], |
38a448ca | 9191 | gen_rtx_REG (mode, op_alt_regno[op][j]), 1); |
2a9fb548 | 9192 | } |
e9a25f70 JL |
9193 | |
9194 | /* Go back to the obstack we are using for temporary | |
9195 | storage. */ | |
9196 | push_obstacks (&reload_obstack, &reload_obstack); | |
9197 | ||
9198 | return apply_change_group (); | |
9199 | #else | |
9200 | return 0; | |
9201 | #endif | |
2a9fb548 ILT |
9202 | } |
9203 | ||
9204 | /* These two variables are used to pass information from | |
9205 | reload_cse_record_set to reload_cse_check_clobber. */ | |
9206 | ||
9207 | static int reload_cse_check_clobbered; | |
9208 | static rtx reload_cse_check_src; | |
9209 | ||
9210 | /* See if DEST overlaps with RELOAD_CSE_CHECK_SRC. If it does, set | |
9211 | RELOAD_CSE_CHECK_CLOBBERED. This is called via note_stores. The | |
9212 | second argument, which is passed by note_stores, is ignored. */ | |
9213 | ||
9214 | static void | |
9215 | reload_cse_check_clobber (dest, ignore) | |
9216 | rtx dest; | |
487a6e06 | 9217 | rtx ignore ATTRIBUTE_UNUSED; |
2a9fb548 ILT |
9218 | { |
9219 | if (reg_overlap_mentioned_p (dest, reload_cse_check_src)) | |
9220 | reload_cse_check_clobbered = 1; | |
9221 | } | |
9222 | ||
9223 | /* Record the result of a SET instruction. SET is the set pattern. | |
9224 | BODY is the pattern of the insn that it came from. */ | |
9225 | ||
9226 | static void | |
9227 | reload_cse_record_set (set, body) | |
9228 | rtx set; | |
9229 | rtx body; | |
9230 | { | |
9e148ceb | 9231 | rtx dest, src, x; |
2a9fb548 ILT |
9232 | int dreg, sreg; |
9233 | enum machine_mode dest_mode; | |
9234 | ||
9235 | dest = SET_DEST (set); | |
9236 | src = SET_SRC (set); | |
9237 | dreg = true_regnum (dest); | |
9238 | sreg = true_regnum (src); | |
9239 | dest_mode = GET_MODE (dest); | |
9240 | ||
9e148ceb ILT |
9241 | /* Some machines don't define AUTO_INC_DEC, but they still use push |
9242 | instructions. We need to catch that case here in order to | |
9243 | invalidate the stack pointer correctly. Note that invalidating | |
9244 | the stack pointer is different from invalidating DEST. */ | |
9245 | x = dest; | |
9246 | while (GET_CODE (x) == SUBREG | |
9247 | || GET_CODE (x) == ZERO_EXTRACT | |
9248 | || GET_CODE (x) == SIGN_EXTRACT | |
9249 | || GET_CODE (x) == STRICT_LOW_PART) | |
9250 | x = XEXP (x, 0); | |
9251 | if (push_operand (x, GET_MODE (x))) | |
9252 | { | |
9253 | reload_cse_invalidate_rtx (stack_pointer_rtx, NULL_RTX); | |
9254 | reload_cse_invalidate_rtx (dest, NULL_RTX); | |
9255 | return; | |
9256 | } | |
9257 | ||
2a9fb548 ILT |
9258 | /* We can only handle an assignment to a register, or a store of a |
9259 | register to a memory location. For other cases, we just clobber | |
9260 | the destination. We also have to just clobber if there are side | |
9261 | effects in SRC or DEST. */ | |
9262 | if ((dreg < 0 && GET_CODE (dest) != MEM) | |
9263 | || side_effects_p (src) | |
9264 | || side_effects_p (dest)) | |
9265 | { | |
9266 | reload_cse_invalidate_rtx (dest, NULL_RTX); | |
9267 | return; | |
9268 | } | |
9269 | ||
9270 | #ifdef HAVE_cc0 | |
9271 | /* We don't try to handle values involving CC, because it's a pain | |
9272 | to keep track of when they have to be invalidated. */ | |
9273 | if (reg_mentioned_p (cc0_rtx, src) | |
9274 | || reg_mentioned_p (cc0_rtx, dest)) | |
9275 | { | |
9276 | reload_cse_invalidate_rtx (dest, NULL_RTX); | |
9277 | return; | |
9278 | } | |
9279 | #endif | |
9280 | ||
9281 | /* If BODY is a PARALLEL, then we need to see whether the source of | |
9282 | SET is clobbered by some other instruction in the PARALLEL. */ | |
9283 | if (GET_CODE (body) == PARALLEL) | |
9284 | { | |
9285 | int i; | |
9286 | ||
9287 | for (i = XVECLEN (body, 0) - 1; i >= 0; --i) | |
9288 | { | |
9289 | rtx x; | |
9290 | ||
9291 | x = XVECEXP (body, 0, i); | |
9292 | if (x == set) | |
9293 | continue; | |
9294 | ||
9295 | reload_cse_check_clobbered = 0; | |
9296 | reload_cse_check_src = src; | |
9297 | note_stores (x, reload_cse_check_clobber); | |
9298 | if (reload_cse_check_clobbered) | |
9299 | { | |
9300 | reload_cse_invalidate_rtx (dest, NULL_RTX); | |
9301 | return; | |
9302 | } | |
9303 | } | |
9304 | } | |
9305 | ||
9306 | if (dreg >= 0) | |
9307 | { | |
9308 | int i; | |
9309 | ||
9310 | /* This is an assignment to a register. Update the value we | |
9311 | have stored for the register. */ | |
9312 | if (sreg >= 0) | |
ad578014 ILT |
9313 | { |
9314 | rtx x; | |
9315 | ||
9316 | /* This is a copy from one register to another. Any values | |
9317 | which were valid for SREG are now valid for DREG. If the | |
9318 | mode changes, we use gen_lowpart_common to extract only | |
9319 | the part of the value that is copied. */ | |
9320 | reg_values[dreg] = 0; | |
9321 | for (x = reg_values[sreg]; x; x = XEXP (x, 1)) | |
9322 | { | |
9323 | rtx tmp; | |
9324 | ||
9325 | if (XEXP (x, 0) == 0) | |
9326 | continue; | |
9327 | if (dest_mode == GET_MODE (XEXP (x, 0))) | |
9328 | tmp = XEXP (x, 0); | |
23e7786b JL |
9329 | else if (GET_MODE_BITSIZE (dest_mode) |
9330 | > GET_MODE_BITSIZE (GET_MODE (XEXP (x, 0)))) | |
9331 | continue; | |
ad578014 ILT |
9332 | else |
9333 | tmp = gen_lowpart_common (dest_mode, XEXP (x, 0)); | |
9334 | if (tmp) | |
38a448ca RH |
9335 | reg_values[dreg] = gen_rtx_EXPR_LIST (dest_mode, tmp, |
9336 | reg_values[dreg]); | |
ad578014 ILT |
9337 | } |
9338 | } | |
2a9fb548 | 9339 | else |
38a448ca | 9340 | reg_values[dreg] = gen_rtx_EXPR_LIST (dest_mode, src, NULL_RTX); |
2a9fb548 ILT |
9341 | |
9342 | /* We've changed DREG, so invalidate any values held by other | |
9343 | registers that depend upon it. */ | |
9344 | reload_cse_invalidate_regno (dreg, dest_mode, 0); | |
9345 | ||
9346 | /* If this assignment changes more than one hard register, | |
9347 | forget anything we know about the others. */ | |
9348 | for (i = 1; i < HARD_REGNO_NREGS (dreg, dest_mode); i++) | |
9349 | reg_values[dreg + i] = 0; | |
9350 | } | |
9351 | else if (GET_CODE (dest) == MEM) | |
9352 | { | |
9353 | /* Invalidate conflicting memory locations. */ | |
9354 | reload_cse_invalidate_mem (dest); | |
9355 | ||
9356 | /* If we're storing a register to memory, add DEST to the list | |
9357 | in REG_VALUES. */ | |
9358 | if (sreg >= 0 && ! side_effects_p (dest)) | |
38a448ca | 9359 | reg_values[sreg] = gen_rtx_EXPR_LIST (dest_mode, dest, |
2a9fb548 ILT |
9360 | reg_values[sreg]); |
9361 | } | |
9362 | else | |
9363 | { | |
9364 | /* We should have bailed out earlier. */ | |
9365 | abort (); | |
9366 | } | |
9367 | } | |
5adf6da0 R |
9368 | \f |
9369 | /* If reload couldn't use reg+reg+offset addressing, try to use reg+reg | |
9370 | addressing now. | |
9371 | This code might also be useful when reload gave up on reg+reg addresssing | |
9372 | because of clashes between the return register and INDEX_REG_CLASS. */ | |
9373 | ||
9374 | /* The maximum number of uses of a register we can keep track of to | |
9375 | replace them with reg+reg addressing. */ | |
9376 | #define RELOAD_COMBINE_MAX_USES 6 | |
9377 | ||
9378 | /* INSN is the insn where a register has ben used, and USEP points to the | |
9379 | location of the register within the rtl. */ | |
9380 | struct reg_use { rtx insn, *usep; }; | |
9381 | ||
9382 | /* If the register is used in some unknown fashion, USE_INDEX is negative. | |
9383 | If it is dead, USE_INDEX is RELOAD_COMBINE_MAX_USES, and STORE_RUID | |
9384 | indicates where it becomes live again. | |
9385 | Otherwise, USE_INDEX is the index of the last encountered use of the | |
9386 | register (which is first among these we have seen since we scan backwards), | |
9387 | OFFSET contains the constant offset that is added to the register in | |
9388 | all encountered uses, and USE_RUID indicates the first encountered, i.e. | |
9389 | last, of these uses. */ | |
9390 | static struct | |
9391 | { | |
9392 | struct reg_use reg_use[RELOAD_COMBINE_MAX_USES]; | |
9393 | int use_index; | |
9394 | rtx offset; | |
9395 | int store_ruid; | |
9396 | int use_ruid; | |
9397 | } reg_state[FIRST_PSEUDO_REGISTER]; | |
9398 | ||
9399 | /* Reverse linear uid. This is increased in reload_combine while scanning | |
9400 | the instructions from last to first. It is used to set last_label_ruid | |
9401 | and the store_ruid / use_ruid fields in reg_state. */ | |
9402 | static int reload_combine_ruid; | |
9403 | ||
9404 | static void | |
9405 | reload_combine () | |
9406 | { | |
9407 | rtx insn, set; | |
9408 | int first_index_reg = 1, last_index_reg = 0; | |
9409 | int i; | |
9410 | int last_label_ruid; | |
9411 | ||
9412 | /* If reg+reg can be used in offsetable memory adresses, the main chunk of | |
9413 | reload has already used it where appropriate, so there is no use in | |
9414 | trying to generate it now. */ | |
03acd8f8 | 9415 | if (double_reg_address_ok && INDEX_REG_CLASS != NO_REGS) |
5adf6da0 R |
9416 | return; |
9417 | ||
9418 | /* To avoid wasting too much time later searching for an index register, | |
9419 | determine the minimum and maximum index register numbers. */ | |
9420 | for (i = FIRST_PSEUDO_REGISTER - 1; i >= 0; --i) | |
9421 | { | |
9422 | if (TEST_HARD_REG_BIT (reg_class_contents[INDEX_REG_CLASS], i)) | |
9423 | { | |
9424 | if (! last_index_reg) | |
9425 | last_index_reg = i; | |
9426 | first_index_reg = i; | |
9427 | } | |
9428 | } | |
9429 | /* If no index register is available, we can quit now. */ | |
9430 | if (first_index_reg > last_index_reg) | |
9431 | return; | |
9432 | ||
9433 | /* Initialize last_label_ruid, reload_combine_ruid and reg_state. */ | |
9434 | last_label_ruid = reload_combine_ruid = 0; | |
9435 | for (i = FIRST_PSEUDO_REGISTER - 1; i >= 0; --i) | |
9436 | { | |
9437 | if (fixed_regs[i]) | |
9438 | reg_state[i].use_index = -1; | |
9439 | else | |
9440 | { | |
9441 | reg_state[i].use_index = RELOAD_COMBINE_MAX_USES; | |
9442 | reg_state[i].store_ruid = reload_combine_ruid; | |
9443 | } | |
9444 | } | |
9445 | ||
9446 | for (insn = get_last_insn (); insn; insn = PREV_INSN (insn)) | |
9447 | { | |
9448 | rtx note; | |
9449 | ||
9450 | /* We cannot do our optimization across labels. Invalidating all the use | |
9451 | information we have would be costly, so we just note where the label | |
9452 | is and then later disable any optimization that would cross it. */ | |
9453 | if (GET_CODE (insn) == CODE_LABEL) | |
9454 | last_label_ruid = reload_combine_ruid; | |
9455 | if (GET_RTX_CLASS (GET_CODE (insn)) != 'i') | |
9456 | continue; | |
9457 | reload_combine_ruid++; | |
9458 | ||
9459 | /* Look for (set (REGX) (CONST_INT)) | |
9460 | (set (REGX) (PLUS (REGX) (REGY))) | |
9461 | ... | |
9462 | ... (MEM (REGX)) ... | |
9463 | and convert it to | |
9464 | (set (REGZ) (CONST_INT)) | |
9465 | ... | |
9466 | ... (MEM (PLUS (REGZ) (REGY)))... . | |
9467 | ||
9468 | First, check that we have (set (REGX) (PLUS (REGX) (REGY))) | |
9469 | and that we know all uses of REGX before it dies. */ | |
2abbc1bd R |
9470 | set = single_set (insn); |
9471 | if (set != NULL_RTX | |
5adf6da0 R |
9472 | && GET_CODE (SET_DEST (set)) == REG |
9473 | && (HARD_REGNO_NREGS (REGNO (SET_DEST (set)), | |
9474 | GET_MODE (SET_DEST (set))) | |
9475 | == 1) | |
9476 | && GET_CODE (SET_SRC (set)) == PLUS | |
9477 | && GET_CODE (XEXP (SET_SRC (set), 1)) == REG | |
9478 | && rtx_equal_p (XEXP (SET_SRC (set), 0), SET_DEST (set)) | |
9479 | && last_label_ruid < reg_state[REGNO (SET_DEST (set))].use_ruid) | |
9480 | { | |
9481 | rtx reg = SET_DEST (set); | |
9482 | rtx plus = SET_SRC (set); | |
9483 | rtx base = XEXP (plus, 1); | |
9484 | rtx prev = prev_nonnote_insn (insn); | |
9485 | rtx prev_set = prev ? single_set (prev) : NULL_RTX; | |
9486 | int regno = REGNO (reg); | |
9487 | rtx const_reg; | |
9488 | rtx reg_sum = NULL_RTX; | |
9489 | ||
9490 | /* Now, we need an index register. | |
9491 | We'll set index_reg to this index register, const_reg to the | |
9492 | register that is to be loaded with the constant | |
9493 | (denoted as REGZ in the substitution illustration above), | |
9494 | and reg_sum to the register-register that we want to use to | |
9495 | substitute uses of REG (typically in MEMs) with. | |
9496 | First check REG and BASE for being index registers; | |
9497 | we can use them even if they are not dead. */ | |
9498 | if (TEST_HARD_REG_BIT (reg_class_contents[INDEX_REG_CLASS], regno) | |
9499 | || TEST_HARD_REG_BIT (reg_class_contents[INDEX_REG_CLASS], | |
9500 | REGNO (base))) | |
9501 | { | |
9502 | const_reg = reg; | |
9503 | reg_sum = plus; | |
9504 | } | |
9505 | else | |
9506 | { | |
9507 | /* Otherwise, look for a free index register. Since we have | |
9508 | checked above that neiter REG nor BASE are index registers, | |
9509 | if we find anything at all, it will be different from these | |
9510 | two registers. */ | |
9511 | for (i = first_index_reg; i <= last_index_reg; i++) | |
9512 | { | |
9513 | if (TEST_HARD_REG_BIT (reg_class_contents[INDEX_REG_CLASS], i) | |
9514 | && reg_state[i].use_index == RELOAD_COMBINE_MAX_USES | |
9515 | && reg_state[i].store_ruid <= reg_state[regno].use_ruid | |
9516 | && HARD_REGNO_NREGS (i, GET_MODE (reg)) == 1) | |
9517 | { | |
9518 | rtx index_reg = gen_rtx_REG (GET_MODE (reg), i); | |
9519 | const_reg = index_reg; | |
9520 | reg_sum = gen_rtx_PLUS (GET_MODE (reg), index_reg, base); | |
9521 | break; | |
9522 | } | |
9523 | } | |
9524 | } | |
9525 | if (prev_set | |
9526 | && GET_CODE (SET_SRC (prev_set)) == CONST_INT | |
9527 | && rtx_equal_p (SET_DEST (prev_set), reg) | |
9528 | && reg_state[regno].use_index >= 0 | |
9529 | && reg_sum) | |
9530 | { | |
9531 | int i; | |
9532 | ||
9533 | /* Change destination register and - if necessary - the | |
9534 | constant value in PREV, the constant loading instruction. */ | |
9535 | validate_change (prev, &SET_DEST (prev_set), const_reg, 1); | |
9536 | if (reg_state[regno].offset != const0_rtx) | |
9537 | validate_change (prev, | |
9538 | &SET_SRC (prev_set), | |
9539 | GEN_INT (INTVAL (SET_SRC (prev_set)) | |
9540 | + INTVAL (reg_state[regno].offset)), | |
9541 | 1); | |
9542 | /* Now for every use of REG that we have recorded, replace REG | |
9543 | with REG_SUM. */ | |
9544 | for (i = reg_state[regno].use_index; | |
9545 | i < RELOAD_COMBINE_MAX_USES; i++) | |
9546 | validate_change (reg_state[regno].reg_use[i].insn, | |
9547 | reg_state[regno].reg_use[i].usep, | |
9548 | reg_sum, 1); | |
9549 | ||
9550 | if (apply_change_group ()) | |
9551 | { | |
9552 | rtx *np; | |
9553 | ||
9554 | /* Delete the reg-reg addition. */ | |
9555 | PUT_CODE (insn, NOTE); | |
9556 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
9557 | NOTE_SOURCE_FILE (insn) = 0; | |
9558 | ||
9559 | if (reg_state[regno].offset != const0_rtx) | |
9560 | { | |
9561 | /* Previous REG_EQUIV / REG_EQUAL notes for PREV | |
9562 | are now invalid. */ | |
9563 | for (np = ®_NOTES (prev); *np; ) | |
9564 | { | |
9565 | if (REG_NOTE_KIND (*np) == REG_EQUAL | |
9566 | || REG_NOTE_KIND (*np) == REG_EQUIV) | |
9567 | *np = XEXP (*np, 1); | |
9568 | else | |
9569 | np = &XEXP (*np, 1); | |
9570 | } | |
9571 | } | |
9572 | reg_state[regno].use_index = RELOAD_COMBINE_MAX_USES; | |
9573 | reg_state[REGNO (const_reg)].store_ruid = reload_combine_ruid; | |
9574 | continue; | |
9575 | } | |
9576 | } | |
9577 | } | |
9578 | note_stores (PATTERN (insn), reload_combine_note_store); | |
9579 | if (GET_CODE (insn) == CALL_INSN) | |
9580 | { | |
9581 | rtx link; | |
9582 | ||
9583 | for (i = FIRST_PSEUDO_REGISTER - 1; i >= 0; --i) | |
9584 | { | |
9585 | if (call_used_regs[i]) | |
9586 | { | |
9587 | reg_state[i].use_index = RELOAD_COMBINE_MAX_USES; | |
9588 | reg_state[i].store_ruid = reload_combine_ruid; | |
9589 | } | |
9590 | } | |
9591 | for (link = CALL_INSN_FUNCTION_USAGE (insn); link; | |
9592 | link = XEXP (link, 1)) | |
9593 | { | |
9594 | rtx use = XEXP (link, 0); | |
9595 | int regno = REGNO (XEXP (use, 0)); | |
9596 | if (GET_CODE (use) == CLOBBER) | |
9597 | { | |
9598 | reg_state[regno].use_index = RELOAD_COMBINE_MAX_USES; | |
9599 | reg_state[regno].store_ruid = reload_combine_ruid; | |
9600 | } | |
9601 | else | |
9602 | reg_state[regno].use_index = -1; | |
9603 | } | |
9604 | } | |
9605 | if (GET_CODE (insn) == JUMP_INSN) | |
9606 | { | |
9607 | /* Non-spill registers might be used at the call destination in | |
9608 | some unknown fashion, so we have to mark the unknown use. */ | |
9609 | for (i = FIRST_PSEUDO_REGISTER - 1; i >= 0; --i) | |
9610 | { | |
03acd8f8 | 9611 | if (1) |
5adf6da0 R |
9612 | reg_state[i].use_index = -1; |
9613 | } | |
9614 | } | |
9615 | reload_combine_note_use (&PATTERN (insn), insn); | |
9616 | for (note = REG_NOTES (insn); note; note = XEXP (note, 1)) | |
9617 | { | |
9618 | if (REG_NOTE_KIND (note) == REG_INC | |
9619 | && GET_CODE (XEXP (note, 0)) == REG) | |
9620 | reg_state[REGNO (XEXP (note, 0))].use_index = -1; | |
9621 | } | |
9622 | } | |
9623 | } | |
9624 | ||
9625 | /* Check if DST is a register or a subreg of a register; if it is, | |
9626 | update reg_state[regno].store_ruid and reg_state[regno].use_index | |
9627 | accordingly. Called via note_stores from reload_combine. | |
9628 | The second argument, SET, is ignored. */ | |
9629 | static void | |
9630 | reload_combine_note_store (dst, set) | |
e51712db | 9631 | rtx dst, set ATTRIBUTE_UNUSED; |
5adf6da0 R |
9632 | { |
9633 | int regno = 0; | |
9634 | int i; | |
9635 | unsigned size = GET_MODE_SIZE (GET_MODE (dst)); | |
9636 | ||
9637 | if (GET_CODE (dst) == SUBREG) | |
9638 | { | |
9639 | regno = SUBREG_WORD (dst); | |
9640 | dst = SUBREG_REG (dst); | |
9641 | } | |
9642 | if (GET_CODE (dst) != REG) | |
9643 | return; | |
9644 | regno += REGNO (dst); | |
9645 | /* note_stores might have stripped a STRICT_LOW_PART, so we have to be | |
9646 | careful with registers / register parts that are not full words. */ | |
e51712db | 9647 | if (size < (unsigned) UNITS_PER_WORD) |
5adf6da0 R |
9648 | reg_state[regno].use_index = -1; |
9649 | else | |
9650 | { | |
9651 | for (i = size / UNITS_PER_WORD - 1 + regno; i >= regno; i--) | |
9652 | { | |
9653 | reg_state[i].store_ruid = reload_combine_ruid; | |
9654 | reg_state[i].use_index = RELOAD_COMBINE_MAX_USES; | |
9655 | } | |
9656 | } | |
9657 | } | |
9658 | ||
9659 | /* XP points to a piece of rtl that has to be checked for any uses of | |
9660 | registers. | |
9661 | *XP is the pattern of INSN, or a part of it. | |
9662 | Called from reload_combine, and recursively by itself. */ | |
9663 | static void | |
9664 | reload_combine_note_use (xp, insn) | |
9665 | rtx *xp, insn; | |
9666 | { | |
9667 | rtx x = *xp; | |
9668 | enum rtx_code code = x->code; | |
9669 | char *fmt; | |
9670 | int i, j; | |
9671 | rtx offset = const0_rtx; /* For the REG case below. */ | |
9672 | ||
9673 | switch (code) | |
9674 | { | |
9675 | case SET: | |
9676 | if (GET_CODE (SET_DEST (x)) == REG) | |
9677 | { | |
9678 | reload_combine_note_use (&SET_SRC (x), insn); | |
9679 | return; | |
9680 | } | |
9681 | break; | |
9682 | ||
9683 | case CLOBBER: | |
9684 | if (GET_CODE (SET_DEST (x)) == REG) | |
9685 | return; | |
9686 | break; | |
9687 | ||
9688 | case PLUS: | |
9689 | /* We are interested in (plus (reg) (const_int)) . */ | |
9690 | if (GET_CODE (XEXP (x, 0)) != REG || GET_CODE (XEXP (x, 1)) != CONST_INT) | |
9691 | break; | |
9692 | offset = XEXP (x, 1); | |
9693 | x = XEXP (x, 0); | |
9694 | /* Fall through. */ | |
9695 | case REG: | |
9696 | { | |
9697 | int regno = REGNO (x); | |
9698 | int use_index; | |
9699 | ||
9700 | /* Some spurious USEs of pseudo registers might remain. | |
9701 | Just ignore them. */ | |
9702 | if (regno >= FIRST_PSEUDO_REGISTER) | |
9703 | return; | |
9704 | ||
9705 | /* If this register is already used in some unknown fashion, we | |
9706 | can't do anything. | |
9707 | If we decrement the index from zero to -1, we can't store more | |
9708 | uses, so this register becomes used in an unknown fashion. */ | |
9709 | use_index = --reg_state[regno].use_index; | |
9710 | if (use_index < 0) | |
9711 | return; | |
9712 | ||
9713 | if (use_index != RELOAD_COMBINE_MAX_USES - 1) | |
9714 | { | |
9715 | /* We have found another use for a register that is already | |
9716 | used later. Check if the offsets match; if not, mark the | |
9717 | register as used in an unknown fashion. */ | |
9718 | if (! rtx_equal_p (offset, reg_state[regno].offset)) | |
9719 | { | |
9720 | reg_state[regno].use_index = -1; | |
9721 | return; | |
9722 | } | |
9723 | } | |
9724 | else | |
9725 | { | |
9726 | /* This is the first use of this register we have seen since we | |
9727 | marked it as dead. */ | |
9728 | reg_state[regno].offset = offset; | |
9729 | reg_state[regno].use_ruid = reload_combine_ruid; | |
9730 | } | |
9731 | reg_state[regno].reg_use[use_index].insn = insn; | |
9732 | reg_state[regno].reg_use[use_index].usep = xp; | |
9733 | return; | |
9734 | } | |
9735 | ||
9736 | default: | |
9737 | break; | |
9738 | } | |
9739 | ||
9740 | /* Recursively process the components of X. */ | |
9741 | fmt = GET_RTX_FORMAT (code); | |
9742 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
9743 | { | |
9744 | if (fmt[i] == 'e') | |
9745 | reload_combine_note_use (&XEXP (x, i), insn); | |
9746 | else if (fmt[i] == 'E') | |
9747 | { | |
9748 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) | |
9749 | reload_combine_note_use (&XVECEXP (x, i, j), insn); | |
9750 | } | |
9751 | } | |
9752 | } | |
9753 | \f | |
9754 | /* See if we can reduce the cost of a constant by replacing a move with | |
9755 | an add. */ | |
9756 | /* We cannot do our optimization across labels. Invalidating all the | |
9757 | information about register contents we have would be costly, so we | |
9758 | use last_label_luid (local variable of reload_cse_move2add) to note | |
9759 | where the label is and then later disable any optimization that would | |
9760 | cross it. | |
9761 | reg_offset[n] / reg_base_reg[n] / reg_mode[n] are only valid if | |
9762 | reg_set_luid[n] is larger than last_label_luid[n] . */ | |
9763 | static int reg_set_luid[FIRST_PSEUDO_REGISTER]; | |
9764 | /* reg_offset[n] has to be CONST_INT for it and reg_base_reg[n] / | |
9765 | reg_mode[n] to be valid. | |
9766 | If reg_offset[n] is a CONST_INT and reg_base_reg[n] is negative, register n | |
9767 | has been set to reg_offset[n] in mode reg_mode[n] . | |
9768 | If reg_offset[n] is a CONST_INT and reg_base_reg[n] is non-negative, | |
9769 | register n has been set to the sum of reg_offset[n] and register | |
9770 | reg_base_reg[n], calculated in mode reg_mode[n] . */ | |
9771 | static rtx reg_offset[FIRST_PSEUDO_REGISTER]; | |
9772 | static int reg_base_reg[FIRST_PSEUDO_REGISTER]; | |
9773 | static enum machine_mode reg_mode[FIRST_PSEUDO_REGISTER]; | |
9774 | /* move2add_luid is linearily increased while scanning the instructions | |
9775 | from first to last. It is used to set reg_set_luid in | |
6764d250 | 9776 | reload_cse_move2add and move2add_note_store. */ |
5adf6da0 R |
9777 | static int move2add_luid; |
9778 | ||
9779 | static void | |
9780 | reload_cse_move2add (first) | |
9781 | rtx first; | |
9782 | { | |
9783 | int i; | |
9784 | rtx insn; | |
9785 | int last_label_luid; | |
5adf6da0 R |
9786 | |
9787 | for (i = FIRST_PSEUDO_REGISTER-1; i >= 0; i--) | |
6764d250 BS |
9788 | reg_set_luid[i] = 0; |
9789 | ||
5adf6da0 R |
9790 | last_label_luid = 0; |
9791 | move2add_luid = 1; | |
9792 | for (insn = first; insn; insn = NEXT_INSN (insn), move2add_luid++) | |
9793 | { | |
9794 | rtx pat, note; | |
9795 | ||
9796 | if (GET_CODE (insn) == CODE_LABEL) | |
9797 | last_label_luid = move2add_luid; | |
9798 | if (GET_RTX_CLASS (GET_CODE (insn)) != 'i') | |
9799 | continue; | |
9800 | pat = PATTERN (insn); | |
9801 | /* For simplicity, we only perform this optimization on | |
9802 | straightforward SETs. */ | |
9803 | if (GET_CODE (pat) == SET | |
9804 | && GET_CODE (SET_DEST (pat)) == REG) | |
9805 | { | |
9806 | rtx reg = SET_DEST (pat); | |
9807 | int regno = REGNO (reg); | |
9808 | rtx src = SET_SRC (pat); | |
9809 | ||
9810 | /* Check if we have valid information on the contents of this | |
9811 | register in the mode of REG. */ | |
9812 | /* ??? We don't know how zero / sign extension is handled, hence | |
9813 | we can't go from a narrower to a wider mode. */ | |
9814 | if (reg_set_luid[regno] > last_label_luid | |
9815 | && (GET_MODE_SIZE (GET_MODE (reg)) | |
9816 | <= GET_MODE_SIZE (reg_mode[regno])) | |
9817 | && GET_CODE (reg_offset[regno]) == CONST_INT) | |
9818 | { | |
9819 | /* Try to transform (set (REGX) (CONST_INT A)) | |
9820 | ... | |
9821 | (set (REGX) (CONST_INT B)) | |
9822 | to | |
9823 | (set (REGX) (CONST_INT A)) | |
9824 | ... | |
9825 | (set (REGX) (plus (REGX) (CONST_INT B-A))) */ | |
9826 | ||
9827 | if (GET_CODE (src) == CONST_INT && reg_base_reg[regno] < 0) | |
9828 | { | |
9829 | int success = 0; | |
9830 | rtx new_src = GEN_INT (INTVAL (src) | |
9831 | - INTVAL (reg_offset[regno])); | |
9832 | /* (set (reg) (plus (reg) (const_int 0))) is not canonical; | |
9833 | use (set (reg) (reg)) instead. | |
9834 | We don't delete this insn, nor do we convert it into a | |
9835 | note, to avoid losing register notes or the return | |
9836 | value flag. jump2 already knowns how to get rid of | |
9837 | no-op moves. */ | |
9838 | if (new_src == const0_rtx) | |
9839 | success = validate_change (insn, &SET_SRC (pat), reg, 0); | |
9840 | else if (rtx_cost (new_src, PLUS) < rtx_cost (src, SET) | |
9841 | && have_add2_insn (GET_MODE (reg))) | |
9842 | success = validate_change (insn, &PATTERN (insn), | |
9843 | gen_add2_insn (reg, new_src), 0); | |
5adf6da0 R |
9844 | reg_set_luid[regno] = move2add_luid; |
9845 | reg_mode[regno] = GET_MODE (reg); | |
9846 | reg_offset[regno] = src; | |
9847 | continue; | |
9848 | } | |
9849 | ||
9850 | /* Try to transform (set (REGX) (REGY)) | |
9851 | (set (REGX) (PLUS (REGX) (CONST_INT A))) | |
9852 | ... | |
9853 | (set (REGX) (REGY)) | |
9854 | (set (REGX) (PLUS (REGX) (CONST_INT B))) | |
9855 | to | |
9856 | (REGX) (REGY)) | |
9857 | (set (REGX) (PLUS (REGX) (CONST_INT A))) | |
9858 | ... | |
9859 | (set (REGX) (plus (REGX) (CONST_INT B-A))) */ | |
9860 | else if (GET_CODE (src) == REG | |
9861 | && reg_base_reg[regno] == REGNO (src) | |
9862 | && reg_set_luid[regno] > reg_set_luid[REGNO (src)]) | |
9863 | { | |
9864 | rtx next = next_nonnote_insn (insn); | |
9865 | rtx set; | |
9866 | if (next) | |
9867 | set = single_set (next); | |
9868 | if (next | |
9869 | && set | |
9870 | && SET_DEST (set) == reg | |
9871 | && GET_CODE (SET_SRC (set)) == PLUS | |
9872 | && XEXP (SET_SRC (set), 0) == reg | |
9873 | && GET_CODE (XEXP (SET_SRC (set), 1)) == CONST_INT) | |
9874 | { | |
5adf6da0 R |
9875 | rtx src3 = XEXP (SET_SRC (set), 1); |
9876 | rtx new_src = GEN_INT (INTVAL (src3) | |
9877 | - INTVAL (reg_offset[regno])); | |
9878 | int success = 0; | |
9879 | ||
9880 | if (new_src == const0_rtx) | |
9881 | /* See above why we create (set (reg) (reg)) here. */ | |
9882 | success | |
9883 | = validate_change (next, &SET_SRC (set), reg, 0); | |
9884 | else if ((rtx_cost (new_src, PLUS) | |
9885 | < 2 + rtx_cost (src3, SET)) | |
9886 | && have_add2_insn (GET_MODE (reg))) | |
9887 | success | |
9888 | = validate_change (next, &PATTERN (next), | |
9889 | gen_add2_insn (reg, new_src), 0); | |
9890 | if (success) | |
9891 | { | |
5adf6da0 R |
9892 | /* INSN might be the first insn in a basic block |
9893 | if the preceding insn is a conditional jump | |
9894 | or a possible-throwing call. */ | |
9895 | PUT_CODE (insn, NOTE); | |
9896 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
9897 | NOTE_SOURCE_FILE (insn) = 0; | |
9898 | } | |
9899 | insn = next; | |
9900 | reg_set_luid[regno] = move2add_luid; | |
9901 | reg_mode[regno] = GET_MODE (reg); | |
9902 | reg_offset[regno] = src3; | |
9903 | continue; | |
9904 | } | |
9905 | } | |
9906 | } | |
9907 | } | |
9908 | ||
9909 | for (note = REG_NOTES (insn); note; note = XEXP (note, 1)) | |
9910 | { | |
9911 | if (REG_NOTE_KIND (note) == REG_INC | |
9912 | && GET_CODE (XEXP (note, 0)) == REG) | |
9913 | { | |
9914 | /* Indicate that this register has been recently written to, | |
9915 | but the exact contents are not available. */ | |
9916 | int regno = REGNO (XEXP (note, 0)); | |
9917 | if (regno < FIRST_PSEUDO_REGISTER) | |
9918 | { | |
9919 | reg_set_luid[regno] = move2add_luid; | |
9920 | reg_offset[regno] = note; | |
9921 | } | |
9922 | } | |
5adf6da0 R |
9923 | } |
9924 | note_stores (PATTERN (insn), move2add_note_store); | |
9925 | /* If this is a CALL_INSN, all call used registers are stored with | |
9926 | unknown values. */ | |
9927 | if (GET_CODE (insn) == CALL_INSN) | |
9928 | { | |
9929 | for (i = FIRST_PSEUDO_REGISTER-1; i >= 0; i--) | |
9930 | { | |
9931 | if (call_used_regs[i]) | |
9932 | { | |
9933 | reg_set_luid[i] = move2add_luid; | |
9934 | reg_offset[i] = insn; /* Invalidate contents. */ | |
9935 | } | |
9936 | } | |
9937 | } | |
9938 | } | |
9939 | } | |
9940 | ||
9941 | /* SET is a SET or CLOBBER that sets DST. | |
9942 | Update reg_set_luid, reg_offset and reg_base_reg accordingly. | |
9943 | Called from reload_cse_move2add via note_stores. */ | |
9944 | static void | |
9945 | move2add_note_store (dst, set) | |
9946 | rtx dst, set; | |
9947 | { | |
9948 | int regno = 0; | |
9949 | int i; | |
9950 | ||
9951 | enum machine_mode mode = GET_MODE (dst); | |
9952 | if (GET_CODE (dst) == SUBREG) | |
9953 | { | |
9954 | regno = SUBREG_WORD (dst); | |
9955 | dst = SUBREG_REG (dst); | |
9956 | } | |
9957 | if (GET_CODE (dst) != REG) | |
9958 | return; | |
9959 | ||
9960 | regno += REGNO (dst); | |
9961 | ||
9962 | if (HARD_REGNO_NREGS (regno, mode) == 1 && GET_CODE (set) == SET) | |
9963 | { | |
9964 | rtx src = SET_SRC (set); | |
9965 | ||
9966 | reg_mode[regno] = mode; | |
9967 | switch (GET_CODE (src)) | |
9968 | { | |
9969 | case PLUS: | |
9970 | { | |
9971 | rtx src0 = XEXP (src, 0); | |
9972 | if (GET_CODE (src0) == REG) | |
9973 | { | |
9974 | if (REGNO (src0) != regno | |
9975 | || reg_offset[regno] != const0_rtx) | |
9976 | { | |
9977 | reg_base_reg[regno] = REGNO (src0); | |
9978 | reg_set_luid[regno] = move2add_luid; | |
9979 | } | |
9980 | reg_offset[regno] = XEXP (src, 1); | |
9981 | break; | |
9982 | } | |
9983 | reg_set_luid[regno] = move2add_luid; | |
9984 | reg_offset[regno] = set; /* Invalidate contents. */ | |
9985 | break; | |
9986 | } | |
9987 | ||
9988 | case REG: | |
9989 | reg_base_reg[regno] = REGNO (SET_SRC (set)); | |
9990 | reg_offset[regno] = const0_rtx; | |
9991 | reg_set_luid[regno] = move2add_luid; | |
9992 | break; | |
9993 | ||
9994 | default: | |
9995 | reg_base_reg[regno] = -1; | |
9996 | reg_offset[regno] = SET_SRC (set); | |
9997 | reg_set_luid[regno] = move2add_luid; | |
9998 | break; | |
9999 | } | |
10000 | } | |
10001 | else | |
10002 | { | |
10003 | for (i = regno + HARD_REGNO_NREGS (regno, mode) - 1; i >= regno; i--) | |
10004 | { | |
10005 | /* Indicate that this register has been recently written to, | |
10006 | but the exact contents are not available. */ | |
10007 | reg_set_luid[i] = move2add_luid; | |
10008 | reg_offset[i] = dst; | |
10009 | } | |
10010 | } | |
10011 | } |