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6f086dfc | 1 | /* Expands front end tree to back end RTL for GNU C-Compiler |
a5cad800 | 2 | Copyright (C) 1987, 88, 89, 91-98, 1999 Free Software Foundation, Inc. |
6f086dfc RS |
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 | |
a35311b0 RK |
18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
6f086dfc RS |
20 | |
21 | ||
22 | /* This file handles the generation of rtl code from tree structure | |
23 | at the level of the function as a whole. | |
24 | It creates the rtl expressions for parameters and auto variables | |
25 | and has full responsibility for allocating stack slots. | |
26 | ||
27 | `expand_function_start' is called at the beginning of a function, | |
28 | before the function body is parsed, and `expand_function_end' is | |
29 | called after parsing the body. | |
30 | ||
31 | Call `assign_stack_local' to allocate a stack slot for a local variable. | |
32 | This is usually done during the RTL generation for the function body, | |
33 | but it can also be done in the reload pass when a pseudo-register does | |
34 | not get a hard register. | |
35 | ||
36 | Call `put_var_into_stack' when you learn, belatedly, that a variable | |
37 | previously given a pseudo-register must in fact go in the stack. | |
38 | This function changes the DECL_RTL to be a stack slot instead of a reg | |
39 | then scans all the RTL instructions so far generated to correct them. */ | |
40 | ||
41 | #include "config.h" | |
670ee920 | 42 | #include "system.h" |
6f086dfc RS |
43 | #include "rtl.h" |
44 | #include "tree.h" | |
45 | #include "flags.h" | |
1ef08c63 | 46 | #include "except.h" |
6f086dfc RS |
47 | #include "function.h" |
48 | #include "insn-flags.h" | |
49 | #include "expr.h" | |
50 | #include "insn-codes.h" | |
51 | #include "regs.h" | |
52 | #include "hard-reg-set.h" | |
53 | #include "insn-config.h" | |
54 | #include "recog.h" | |
55 | #include "output.h" | |
bdac5f58 | 56 | #include "basic-block.h" |
c20bf1f3 | 57 | #include "obstack.h" |
10f0ad3d | 58 | #include "toplev.h" |
fe9b4957 | 59 | #include "hash.h" |
6f086dfc | 60 | |
189cc377 RK |
61 | #ifndef TRAMPOLINE_ALIGNMENT |
62 | #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY | |
63 | #endif | |
64 | ||
d16790f2 JW |
65 | #ifndef LOCAL_ALIGNMENT |
66 | #define LOCAL_ALIGNMENT(TYPE, ALIGNMENT) ALIGNMENT | |
67 | #endif | |
68 | ||
293e3de4 RS |
69 | /* Some systems use __main in a way incompatible with its use in gcc, in these |
70 | cases use the macros NAME__MAIN to give a quoted symbol and SYMBOL__MAIN to | |
71 | give the same symbol without quotes for an alternative entry point. You | |
0f41302f | 72 | must define both, or neither. */ |
293e3de4 RS |
73 | #ifndef NAME__MAIN |
74 | #define NAME__MAIN "__main" | |
75 | #define SYMBOL__MAIN __main | |
76 | #endif | |
77 | ||
6f086dfc RS |
78 | /* Round a value to the lowest integer less than it that is a multiple of |
79 | the required alignment. Avoid using division in case the value is | |
80 | negative. Assume the alignment is a power of two. */ | |
81 | #define FLOOR_ROUND(VALUE,ALIGN) ((VALUE) & ~((ALIGN) - 1)) | |
82 | ||
83 | /* Similar, but round to the next highest integer that meets the | |
84 | alignment. */ | |
85 | #define CEIL_ROUND(VALUE,ALIGN) (((VALUE) + (ALIGN) - 1) & ~((ALIGN)- 1)) | |
86 | ||
87 | /* NEED_SEPARATE_AP means that we cannot derive ap from the value of fp | |
88 | during rtl generation. If they are different register numbers, this is | |
89 | always true. It may also be true if | |
90 | FIRST_PARM_OFFSET - STARTING_FRAME_OFFSET is not a constant during rtl | |
91 | generation. See fix_lexical_addr for details. */ | |
92 | ||
93 | #if ARG_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
94 | #define NEED_SEPARATE_AP | |
95 | #endif | |
96 | ||
54ff41b7 JW |
97 | /* Nonzero if function being compiled doesn't contain any calls |
98 | (ignoring the prologue and epilogue). This is set prior to | |
99 | local register allocation and is valid for the remaining | |
100 | compiler passes. */ | |
54ff41b7 JW |
101 | int current_function_is_leaf; |
102 | ||
fdb8a883 JW |
103 | /* Nonzero if function being compiled doesn't modify the stack pointer |
104 | (ignoring the prologue and epilogue). This is only valid after | |
105 | life_analysis has run. */ | |
fdb8a883 JW |
106 | int current_function_sp_is_unchanging; |
107 | ||
54ff41b7 JW |
108 | /* Nonzero if the function being compiled is a leaf function which only |
109 | uses leaf registers. This is valid after reload (specifically after | |
110 | sched2) and is useful only if the port defines LEAF_REGISTERS. */ | |
54ff41b7 JW |
111 | int current_function_uses_only_leaf_regs; |
112 | ||
6f086dfc RS |
113 | /* Nonzero once virtual register instantiation has been done. |
114 | assign_stack_local uses frame_pointer_rtx when this is nonzero. */ | |
115 | static int virtuals_instantiated; | |
116 | ||
46766466 RS |
117 | /* These variables hold pointers to functions to |
118 | save and restore machine-specific data, | |
119 | in push_function_context and pop_function_context. */ | |
9e014ded RK |
120 | void (*save_machine_status) PROTO((struct function *)); |
121 | void (*restore_machine_status) PROTO((struct function *)); | |
46766466 | 122 | |
49ad7cfa BS |
123 | /* The FUNCTION_DECL for an inline function currently being expanded. */ |
124 | tree inline_function_decl; | |
b384405b BS |
125 | |
126 | /* The currently compiled function. */ | |
127 | struct function *current_function = 0; | |
128 | ||
129 | /* Global list of all compiled functions. */ | |
130 | struct function *all_functions = 0; | |
5c7675e9 RH |
131 | |
132 | /* These arrays record the INSN_UIDs of the prologue and epilogue insns. */ | |
133 | static int *prologue; | |
134 | static int *epilogue; | |
6f086dfc RS |
135 | \f |
136 | /* In order to evaluate some expressions, such as function calls returning | |
137 | structures in memory, we need to temporarily allocate stack locations. | |
138 | We record each allocated temporary in the following structure. | |
139 | ||
140 | Associated with each temporary slot is a nesting level. When we pop up | |
141 | one level, all temporaries associated with the previous level are freed. | |
142 | Normally, all temporaries are freed after the execution of the statement | |
143 | in which they were created. However, if we are inside a ({...}) grouping, | |
144 | the result may be in a temporary and hence must be preserved. If the | |
145 | result could be in a temporary, we preserve it if we can determine which | |
146 | one it is in. If we cannot determine which temporary may contain the | |
147 | result, all temporaries are preserved. A temporary is preserved by | |
148 | pretending it was allocated at the previous nesting level. | |
149 | ||
150 | Automatic variables are also assigned temporary slots, at the nesting | |
151 | level where they are defined. They are marked a "kept" so that | |
152 | free_temp_slots will not free them. */ | |
153 | ||
154 | struct temp_slot | |
155 | { | |
156 | /* Points to next temporary slot. */ | |
157 | struct temp_slot *next; | |
0f41302f | 158 | /* The rtx to used to reference the slot. */ |
6f086dfc | 159 | rtx slot; |
e5e76139 RK |
160 | /* The rtx used to represent the address if not the address of the |
161 | slot above. May be an EXPR_LIST if multiple addresses exist. */ | |
162 | rtx address; | |
d16790f2 JW |
163 | /* The alignment (in bits) of the slot. */ |
164 | int align; | |
6f086dfc | 165 | /* The size, in units, of the slot. */ |
e5e809f4 | 166 | HOST_WIDE_INT size; |
a4c6502a MM |
167 | /* The alias set for the slot. If the alias set is zero, we don't |
168 | know anything about the alias set of the slot. We must only | |
169 | reuse a slot if it is assigned an object of the same alias set. | |
170 | Otherwise, the rest of the compiler may assume that the new use | |
171 | of the slot cannot alias the old use of the slot, which is | |
172 | false. If the slot has alias set zero, then we can't reuse the | |
173 | slot at all, since we have no idea what alias set may have been | |
174 | imposed on the memory. For example, if the stack slot is the | |
175 | call frame for an inline functioned, we have no idea what alias | |
176 | sets will be assigned to various pieces of the call frame. */ | |
177 | int alias_set; | |
e7a84011 RK |
178 | /* The value of `sequence_rtl_expr' when this temporary is allocated. */ |
179 | tree rtl_expr; | |
6f086dfc RS |
180 | /* Non-zero if this temporary is currently in use. */ |
181 | char in_use; | |
a25d4ba2 RK |
182 | /* Non-zero if this temporary has its address taken. */ |
183 | char addr_taken; | |
6f086dfc RS |
184 | /* Nesting level at which this slot is being used. */ |
185 | int level; | |
186 | /* Non-zero if this should survive a call to free_temp_slots. */ | |
187 | int keep; | |
fc91b0d0 RK |
188 | /* The offset of the slot from the frame_pointer, including extra space |
189 | for alignment. This info is for combine_temp_slots. */ | |
e5e809f4 | 190 | HOST_WIDE_INT base_offset; |
fc91b0d0 RK |
191 | /* The size of the slot, including extra space for alignment. This |
192 | info is for combine_temp_slots. */ | |
e5e809f4 | 193 | HOST_WIDE_INT full_size; |
6f086dfc | 194 | }; |
6f086dfc | 195 | \f |
e15679f8 RK |
196 | /* This structure is used to record MEMs or pseudos used to replace VAR, any |
197 | SUBREGs of VAR, and any MEMs containing VAR as an address. We need to | |
198 | maintain this list in case two operands of an insn were required to match; | |
199 | in that case we must ensure we use the same replacement. */ | |
200 | ||
201 | struct fixup_replacement | |
202 | { | |
203 | rtx old; | |
204 | rtx new; | |
205 | struct fixup_replacement *next; | |
206 | }; | |
207 | ||
fe9b4957 MM |
208 | struct insns_for_mem_entry { |
209 | /* The KEY in HE will be a MEM. */ | |
210 | struct hash_entry he; | |
211 | /* These are the INSNS which reference the MEM. */ | |
212 | rtx insns; | |
213 | }; | |
214 | ||
e15679f8 RK |
215 | /* Forward declarations. */ |
216 | ||
1ac4f799 JL |
217 | static rtx assign_outer_stack_local PROTO ((enum machine_mode, HOST_WIDE_INT, |
218 | int, struct function *)); | |
d16790f2 JW |
219 | static rtx assign_stack_temp_for_type PROTO ((enum machine_mode, HOST_WIDE_INT, |
220 | int, tree)); | |
e15679f8 RK |
221 | static struct temp_slot *find_temp_slot_from_address PROTO((rtx)); |
222 | static void put_reg_into_stack PROTO((struct function *, rtx, tree, | |
0006e95b | 223 | enum machine_mode, enum machine_mode, |
fe9b4957 MM |
224 | int, int, int, |
225 | struct hash_table *)); | |
226 | static void fixup_var_refs PROTO((rtx, enum machine_mode, int, | |
227 | struct hash_table *)); | |
e15679f8 RK |
228 | static struct fixup_replacement |
229 | *find_fixup_replacement PROTO((struct fixup_replacement **, rtx)); | |
230 | static void fixup_var_refs_insns PROTO((rtx, enum machine_mode, int, | |
fe9b4957 | 231 | rtx, int, struct hash_table *)); |
e15679f8 RK |
232 | static void fixup_var_refs_1 PROTO((rtx, enum machine_mode, rtx *, rtx, |
233 | struct fixup_replacement **)); | |
234 | static rtx fixup_memory_subreg PROTO((rtx, rtx, int)); | |
235 | static rtx walk_fixup_memory_subreg PROTO((rtx, rtx, int)); | |
236 | static rtx fixup_stack_1 PROTO((rtx, rtx)); | |
237 | static void optimize_bit_field PROTO((rtx, rtx, rtx *)); | |
238 | static void instantiate_decls PROTO((tree, int)); | |
239 | static void instantiate_decls_1 PROTO((tree, int)); | |
240 | static void instantiate_decl PROTO((rtx, int, int)); | |
241 | static int instantiate_virtual_regs_1 PROTO((rtx *, rtx, int)); | |
242 | static void delete_handlers PROTO((void)); | |
243 | static void pad_to_arg_alignment PROTO((struct args_size *, int)); | |
51723711 | 244 | #ifndef ARGS_GROW_DOWNWARD |
e15679f8 RK |
245 | static void pad_below PROTO((struct args_size *, enum machine_mode, |
246 | tree)); | |
51723711 | 247 | #endif |
487a6e06 | 248 | #ifdef ARGS_GROW_DOWNWARD |
e15679f8 | 249 | static tree round_down PROTO((tree, int)); |
487a6e06 | 250 | #endif |
e15679f8 RK |
251 | static rtx round_trampoline_addr PROTO((rtx)); |
252 | static tree blocks_nreverse PROTO((tree)); | |
253 | static int all_blocks PROTO((tree, tree *)); | |
081f5e7e | 254 | #if defined (HAVE_prologue) || defined (HAVE_epilogue) |
487a6e06 | 255 | static int *record_insns PROTO((rtx)); |
e15679f8 | 256 | static int contains PROTO((rtx, int *)); |
081f5e7e | 257 | #endif /* HAVE_prologue || HAVE_epilogue */ |
fe9b4957 MM |
258 | static void put_addressof_into_stack PROTO((rtx, struct hash_table *)); |
259 | static void purge_addressof_1 PROTO((rtx *, rtx, int, int, | |
260 | struct hash_table *)); | |
261 | static struct hash_entry *insns_for_mem_newfunc PROTO((struct hash_entry *, | |
262 | struct hash_table *, | |
263 | hash_table_key)); | |
264 | static unsigned long insns_for_mem_hash PROTO ((hash_table_key)); | |
265 | static boolean insns_for_mem_comp PROTO ((hash_table_key, hash_table_key)); | |
266 | static int insns_for_mem_walk PROTO ((rtx *, void *)); | |
267 | static void compute_insns_for_mem PROTO ((rtx, rtx, struct hash_table *)); | |
268 | ||
c20bf1f3 | 269 | \f |
6f086dfc RS |
270 | /* Pointer to chain of `struct function' for containing functions. */ |
271 | struct function *outer_function_chain; | |
272 | ||
273 | /* Given a function decl for a containing function, | |
274 | return the `struct function' for it. */ | |
275 | ||
276 | struct function * | |
277 | find_function_data (decl) | |
278 | tree decl; | |
279 | { | |
280 | struct function *p; | |
e5e809f4 | 281 | |
6f086dfc RS |
282 | for (p = outer_function_chain; p; p = p->next) |
283 | if (p->decl == decl) | |
284 | return p; | |
e5e809f4 | 285 | |
6f086dfc RS |
286 | abort (); |
287 | } | |
288 | ||
289 | /* Save the current context for compilation of a nested function. | |
290 | This is called from language-specific code. | |
291 | The caller is responsible for saving any language-specific status, | |
6dc42e49 | 292 | since this function knows only about language-independent variables. */ |
6f086dfc RS |
293 | |
294 | void | |
a0dabda5 JM |
295 | push_function_context_to (context) |
296 | tree context; | |
6f086dfc | 297 | { |
b384405b BS |
298 | struct function *p; |
299 | ||
300 | if (current_function == 0) | |
301 | init_dummy_function_start (); | |
302 | p = current_function; | |
6f086dfc RS |
303 | |
304 | p->next = outer_function_chain; | |
305 | outer_function_chain = p; | |
6f086dfc | 306 | p->decl = current_function_decl; |
6f086dfc RS |
307 | p->fixup_var_refs_queue = 0; |
308 | ||
a0dabda5 | 309 | save_tree_status (p, context); |
e9a25f70 | 310 | save_varasm_status (p, context); |
46766466 RS |
311 | if (save_machine_status) |
312 | (*save_machine_status) (p); | |
b384405b BS |
313 | |
314 | current_function = 0; | |
6f086dfc RS |
315 | } |
316 | ||
e4a4639e JM |
317 | void |
318 | push_function_context () | |
319 | { | |
a0dabda5 | 320 | push_function_context_to (current_function_decl); |
e4a4639e JM |
321 | } |
322 | ||
6f086dfc RS |
323 | /* Restore the last saved context, at the end of a nested function. |
324 | This function is called from language-specific code. */ | |
325 | ||
326 | void | |
a0dabda5 JM |
327 | pop_function_context_from (context) |
328 | tree context; | |
6f086dfc RS |
329 | { |
330 | struct function *p = outer_function_chain; | |
e5e809f4 | 331 | struct var_refs_queue *queue; |
6f086dfc | 332 | |
b384405b | 333 | current_function = p; |
6f086dfc RS |
334 | outer_function_chain = p->next; |
335 | ||
49468af2 | 336 | current_function_contains_functions |
49ad7cfa | 337 | |= p->inline_obstacks || context == current_function_decl; |
6f086dfc | 338 | current_function_decl = p->decl; |
7cbc7b0c | 339 | reg_renumber = 0; |
6f086dfc | 340 | |
d1485032 | 341 | restore_tree_status (p, context); |
6f086dfc | 342 | restore_emit_status (p); |
a506307a | 343 | restore_varasm_status (p); |
6f086dfc | 344 | |
46766466 RS |
345 | if (restore_machine_status) |
346 | (*restore_machine_status) (p); | |
347 | ||
6f086dfc RS |
348 | /* Finish doing put_var_into_stack for any of our variables |
349 | which became addressable during the nested function. */ | |
e5e809f4 | 350 | for (queue = p->fixup_var_refs_queue; queue; queue = queue->next) |
fe9b4957 MM |
351 | fixup_var_refs (queue->modified, queue->promoted_mode, |
352 | queue->unsignedp, 0); | |
6f086dfc | 353 | |
6f086dfc RS |
354 | /* Reset variables that have known state during rtx generation. */ |
355 | rtx_equal_function_value_matters = 1; | |
356 | virtuals_instantiated = 0; | |
357 | } | |
e4a4639e JM |
358 | |
359 | void pop_function_context () | |
360 | { | |
a0dabda5 | 361 | pop_function_context_from (current_function_decl); |
e4a4639e | 362 | } |
6f086dfc RS |
363 | \f |
364 | /* Allocate fixed slots in the stack frame of the current function. */ | |
365 | ||
49ad7cfa BS |
366 | /* Return size needed for stack frame based on slots so far allocated in |
367 | function F. | |
c795bca9 | 368 | This size counts from zero. It is not rounded to PREFERRED_STACK_BOUNDARY; |
6f086dfc RS |
369 | the caller may have to do that. */ |
370 | ||
8af5168b | 371 | HOST_WIDE_INT |
49ad7cfa BS |
372 | get_func_frame_size (f) |
373 | struct function *f; | |
6f086dfc RS |
374 | { |
375 | #ifdef FRAME_GROWS_DOWNWARD | |
49ad7cfa | 376 | return -f->x_frame_offset; |
6f086dfc | 377 | #else |
49ad7cfa | 378 | return f->x_frame_offset; |
6f086dfc RS |
379 | #endif |
380 | } | |
381 | ||
49ad7cfa BS |
382 | /* Return size needed for stack frame based on slots so far allocated. |
383 | This size counts from zero. It is not rounded to PREFERRED_STACK_BOUNDARY; | |
384 | the caller may have to do that. */ | |
385 | HOST_WIDE_INT | |
386 | get_frame_size () | |
387 | { | |
388 | return get_func_frame_size (current_function); | |
389 | } | |
390 | ||
6f086dfc RS |
391 | /* Allocate a stack slot of SIZE bytes and return a MEM rtx for it |
392 | with machine mode MODE. | |
393 | ||
394 | ALIGN controls the amount of alignment for the address of the slot: | |
395 | 0 means according to MODE, | |
396 | -1 means use BIGGEST_ALIGNMENT and round size to multiple of that, | |
397 | positive specifies alignment boundary in bits. | |
398 | ||
399 | We do not round to stack_boundary here. */ | |
400 | ||
401 | rtx | |
402 | assign_stack_local (mode, size, align) | |
403 | enum machine_mode mode; | |
e5e809f4 | 404 | HOST_WIDE_INT size; |
6f086dfc RS |
405 | int align; |
406 | { | |
407 | register rtx x, addr; | |
408 | int bigend_correction = 0; | |
409 | int alignment; | |
410 | ||
411 | if (align == 0) | |
412 | { | |
d16790f2 JW |
413 | tree type; |
414 | ||
415 | alignment = GET_MODE_ALIGNMENT (mode); | |
6f086dfc | 416 | if (mode == BLKmode) |
d16790f2 JW |
417 | alignment = BIGGEST_ALIGNMENT; |
418 | ||
419 | /* Allow the target to (possibly) increase the alignment of this | |
420 | stack slot. */ | |
421 | type = type_for_mode (mode, 0); | |
422 | if (type) | |
423 | alignment = LOCAL_ALIGNMENT (type, alignment); | |
424 | ||
425 | alignment /= BITS_PER_UNIT; | |
6f086dfc RS |
426 | } |
427 | else if (align == -1) | |
428 | { | |
429 | alignment = BIGGEST_ALIGNMENT / BITS_PER_UNIT; | |
430 | size = CEIL_ROUND (size, alignment); | |
431 | } | |
432 | else | |
433 | alignment = align / BITS_PER_UNIT; | |
434 | ||
1474e303 JL |
435 | #ifdef FRAME_GROWS_DOWNWARD |
436 | frame_offset -= size; | |
437 | #endif | |
438 | ||
6f086dfc RS |
439 | /* Round frame offset to that alignment. |
440 | We must be careful here, since FRAME_OFFSET might be negative and | |
441 | division with a negative dividend isn't as well defined as we might | |
442 | like. So we instead assume that ALIGNMENT is a power of two and | |
443 | use logical operations which are unambiguous. */ | |
444 | #ifdef FRAME_GROWS_DOWNWARD | |
445 | frame_offset = FLOOR_ROUND (frame_offset, alignment); | |
446 | #else | |
447 | frame_offset = CEIL_ROUND (frame_offset, alignment); | |
448 | #endif | |
449 | ||
450 | /* On a big-endian machine, if we are allocating more space than we will use, | |
451 | use the least significant bytes of those that are allocated. */ | |
f76b9db2 | 452 | if (BYTES_BIG_ENDIAN && mode != BLKmode) |
6f086dfc | 453 | bigend_correction = size - GET_MODE_SIZE (mode); |
6f086dfc | 454 | |
6f086dfc RS |
455 | /* If we have already instantiated virtual registers, return the actual |
456 | address relative to the frame pointer. */ | |
457 | if (virtuals_instantiated) | |
458 | addr = plus_constant (frame_pointer_rtx, | |
459 | (frame_offset + bigend_correction | |
460 | + STARTING_FRAME_OFFSET)); | |
461 | else | |
462 | addr = plus_constant (virtual_stack_vars_rtx, | |
463 | frame_offset + bigend_correction); | |
464 | ||
465 | #ifndef FRAME_GROWS_DOWNWARD | |
466 | frame_offset += size; | |
467 | #endif | |
468 | ||
38a448ca | 469 | x = gen_rtx_MEM (mode, addr); |
6f086dfc | 470 | |
38a448ca | 471 | stack_slot_list = gen_rtx_EXPR_LIST (VOIDmode, x, stack_slot_list); |
6f086dfc RS |
472 | |
473 | return x; | |
474 | } | |
475 | ||
476 | /* Assign a stack slot in a containing function. | |
477 | First three arguments are same as in preceding function. | |
478 | The last argument specifies the function to allocate in. */ | |
479 | ||
1ac4f799 | 480 | static rtx |
6f086dfc RS |
481 | assign_outer_stack_local (mode, size, align, function) |
482 | enum machine_mode mode; | |
e5e809f4 | 483 | HOST_WIDE_INT size; |
6f086dfc RS |
484 | int align; |
485 | struct function *function; | |
486 | { | |
487 | register rtx x, addr; | |
488 | int bigend_correction = 0; | |
489 | int alignment; | |
490 | ||
491 | /* Allocate in the memory associated with the function in whose frame | |
492 | we are assigning. */ | |
493 | push_obstacks (function->function_obstack, | |
494 | function->function_maybepermanent_obstack); | |
495 | ||
496 | if (align == 0) | |
497 | { | |
d16790f2 JW |
498 | tree type; |
499 | ||
500 | alignment = GET_MODE_ALIGNMENT (mode); | |
6f086dfc | 501 | if (mode == BLKmode) |
d16790f2 JW |
502 | alignment = BIGGEST_ALIGNMENT; |
503 | ||
504 | /* Allow the target to (possibly) increase the alignment of this | |
505 | stack slot. */ | |
506 | type = type_for_mode (mode, 0); | |
507 | if (type) | |
508 | alignment = LOCAL_ALIGNMENT (type, alignment); | |
509 | ||
510 | alignment /= BITS_PER_UNIT; | |
6f086dfc RS |
511 | } |
512 | else if (align == -1) | |
513 | { | |
514 | alignment = BIGGEST_ALIGNMENT / BITS_PER_UNIT; | |
515 | size = CEIL_ROUND (size, alignment); | |
516 | } | |
517 | else | |
518 | alignment = align / BITS_PER_UNIT; | |
519 | ||
1474e303 | 520 | #ifdef FRAME_GROWS_DOWNWARD |
49ad7cfa | 521 | function->x_frame_offset -= size; |
1474e303 JL |
522 | #endif |
523 | ||
6f086dfc RS |
524 | /* Round frame offset to that alignment. */ |
525 | #ifdef FRAME_GROWS_DOWNWARD | |
49ad7cfa | 526 | function->x_frame_offset = FLOOR_ROUND (function->x_frame_offset, alignment); |
6f086dfc | 527 | #else |
49ad7cfa | 528 | function->x_frame_offset = CEIL_ROUND (function->x_frame_offset, alignment); |
6f086dfc RS |
529 | #endif |
530 | ||
531 | /* On a big-endian machine, if we are allocating more space than we will use, | |
532 | use the least significant bytes of those that are allocated. */ | |
f76b9db2 | 533 | if (BYTES_BIG_ENDIAN && mode != BLKmode) |
6f086dfc | 534 | bigend_correction = size - GET_MODE_SIZE (mode); |
6f086dfc | 535 | |
6f086dfc | 536 | addr = plus_constant (virtual_stack_vars_rtx, |
49ad7cfa | 537 | function->x_frame_offset + bigend_correction); |
6f086dfc | 538 | #ifndef FRAME_GROWS_DOWNWARD |
49ad7cfa | 539 | function->x_frame_offset += size; |
6f086dfc RS |
540 | #endif |
541 | ||
38a448ca | 542 | x = gen_rtx_MEM (mode, addr); |
6f086dfc | 543 | |
49ad7cfa BS |
544 | function->x_stack_slot_list |
545 | = gen_rtx_EXPR_LIST (VOIDmode, x, function->x_stack_slot_list); | |
6f086dfc RS |
546 | |
547 | pop_obstacks (); | |
548 | ||
549 | return x; | |
550 | } | |
551 | \f | |
552 | /* Allocate a temporary stack slot and record it for possible later | |
553 | reuse. | |
554 | ||
555 | MODE is the machine mode to be given to the returned rtx. | |
556 | ||
557 | SIZE is the size in units of the space required. We do no rounding here | |
558 | since assign_stack_local will do any required rounding. | |
559 | ||
d93d4205 MS |
560 | KEEP is 1 if this slot is to be retained after a call to |
561 | free_temp_slots. Automatic variables for a block are allocated | |
e5e809f4 JL |
562 | with this flag. KEEP is 2 if we allocate a longer term temporary, |
563 | whose lifetime is controlled by CLEANUP_POINT_EXPRs. KEEP is 3 | |
564 | if we are to allocate something at an inner level to be treated as | |
a4c6502a MM |
565 | a variable in the block (e.g., a SAVE_EXPR). |
566 | ||
567 | TYPE is the type that will be used for the stack slot. */ | |
6f086dfc | 568 | |
d16790f2 JW |
569 | static rtx |
570 | assign_stack_temp_for_type (mode, size, keep, type) | |
6f086dfc | 571 | enum machine_mode mode; |
e5e809f4 | 572 | HOST_WIDE_INT size; |
6f086dfc | 573 | int keep; |
d16790f2 | 574 | tree type; |
6f086dfc | 575 | { |
d16790f2 | 576 | int align; |
a4c6502a | 577 | int alias_set; |
6f086dfc RS |
578 | struct temp_slot *p, *best_p = 0; |
579 | ||
303ec2aa RK |
580 | /* If SIZE is -1 it means that somebody tried to allocate a temporary |
581 | of a variable size. */ | |
582 | if (size == -1) | |
583 | abort (); | |
584 | ||
a4c6502a MM |
585 | /* If we know the alias set for the memory that will be used, use |
586 | it. If there's no TYPE, then we don't know anything about the | |
587 | alias set for the memory. */ | |
588 | if (type) | |
589 | alias_set = get_alias_set (type); | |
590 | else | |
591 | alias_set = 0; | |
592 | ||
d16790f2 JW |
593 | align = GET_MODE_ALIGNMENT (mode); |
594 | if (mode == BLKmode) | |
595 | align = BIGGEST_ALIGNMENT; | |
6f086dfc | 596 | |
d16790f2 JW |
597 | if (! type) |
598 | type = type_for_mode (mode, 0); | |
599 | if (type) | |
600 | align = LOCAL_ALIGNMENT (type, align); | |
601 | ||
602 | /* Try to find an available, already-allocated temporary of the proper | |
603 | mode which meets the size and alignment requirements. Choose the | |
604 | smallest one with the closest alignment. */ | |
605 | for (p = temp_slots; p; p = p->next) | |
606 | if (p->align >= align && p->size >= size && GET_MODE (p->slot) == mode | |
607 | && ! p->in_use | |
a4c6502a MM |
608 | && (!flag_strict_aliasing |
609 | || (alias_set && p->alias_set == alias_set)) | |
d16790f2 JW |
610 | && (best_p == 0 || best_p->size > p->size |
611 | || (best_p->size == p->size && best_p->align > p->align))) | |
612 | { | |
613 | if (p->align == align && p->size == size) | |
614 | { | |
615 | best_p = 0; | |
616 | break; | |
617 | } | |
6f086dfc | 618 | best_p = p; |
d16790f2 | 619 | } |
6f086dfc RS |
620 | |
621 | /* Make our best, if any, the one to use. */ | |
622 | if (best_p) | |
a45035b6 JW |
623 | { |
624 | /* If there are enough aligned bytes left over, make them into a new | |
625 | temp_slot so that the extra bytes don't get wasted. Do this only | |
626 | for BLKmode slots, so that we can be sure of the alignment. */ | |
a4c6502a MM |
627 | if (GET_MODE (best_p->slot) == BLKmode |
628 | /* We can't split slots if -fstrict-aliasing because the | |
629 | information about the alias set for the new slot will be | |
630 | lost. */ | |
631 | && !flag_strict_aliasing) | |
a45035b6 | 632 | { |
d16790f2 | 633 | int alignment = best_p->align / BITS_PER_UNIT; |
e5e809f4 | 634 | HOST_WIDE_INT rounded_size = CEIL_ROUND (size, alignment); |
a45035b6 JW |
635 | |
636 | if (best_p->size - rounded_size >= alignment) | |
637 | { | |
638 | p = (struct temp_slot *) oballoc (sizeof (struct temp_slot)); | |
a25d4ba2 | 639 | p->in_use = p->addr_taken = 0; |
a45035b6 | 640 | p->size = best_p->size - rounded_size; |
307d8cd6 RK |
641 | p->base_offset = best_p->base_offset + rounded_size; |
642 | p->full_size = best_p->full_size - rounded_size; | |
38a448ca RH |
643 | p->slot = gen_rtx_MEM (BLKmode, |
644 | plus_constant (XEXP (best_p->slot, 0), | |
645 | rounded_size)); | |
d16790f2 | 646 | p->align = best_p->align; |
e5e76139 | 647 | p->address = 0; |
84e24c03 | 648 | p->rtl_expr = 0; |
a45035b6 JW |
649 | p->next = temp_slots; |
650 | temp_slots = p; | |
651 | ||
38a448ca RH |
652 | stack_slot_list = gen_rtx_EXPR_LIST (VOIDmode, p->slot, |
653 | stack_slot_list); | |
a45035b6 JW |
654 | |
655 | best_p->size = rounded_size; | |
291dde90 | 656 | best_p->full_size = rounded_size; |
a45035b6 JW |
657 | } |
658 | } | |
659 | ||
660 | p = best_p; | |
661 | } | |
662 | ||
6f086dfc RS |
663 | /* If we still didn't find one, make a new temporary. */ |
664 | if (p == 0) | |
665 | { | |
e5e809f4 JL |
666 | HOST_WIDE_INT frame_offset_old = frame_offset; |
667 | ||
6f086dfc | 668 | p = (struct temp_slot *) oballoc (sizeof (struct temp_slot)); |
e5e809f4 | 669 | |
c87a0a39 JL |
670 | /* We are passing an explicit alignment request to assign_stack_local. |
671 | One side effect of that is assign_stack_local will not round SIZE | |
672 | to ensure the frame offset remains suitably aligned. | |
673 | ||
674 | So for requests which depended on the rounding of SIZE, we go ahead | |
675 | and round it now. We also make sure ALIGNMENT is at least | |
676 | BIGGEST_ALIGNMENT. */ | |
010529e5 | 677 | if (mode == BLKmode && align < BIGGEST_ALIGNMENT) |
6f67a30d JW |
678 | abort(); |
679 | p->slot = assign_stack_local (mode, | |
010529e5 AS |
680 | (mode == BLKmode |
681 | ? CEIL_ROUND (size, align / BITS_PER_UNIT) | |
682 | : size), | |
6f67a30d | 683 | align); |
d16790f2 JW |
684 | |
685 | p->align = align; | |
a4c6502a | 686 | p->alias_set = alias_set; |
e5e809f4 | 687 | |
b2a80c0d DE |
688 | /* The following slot size computation is necessary because we don't |
689 | know the actual size of the temporary slot until assign_stack_local | |
690 | has performed all the frame alignment and size rounding for the | |
fc91b0d0 RK |
691 | requested temporary. Note that extra space added for alignment |
692 | can be either above or below this stack slot depending on which | |
693 | way the frame grows. We include the extra space if and only if it | |
694 | is above this slot. */ | |
b2a80c0d DE |
695 | #ifdef FRAME_GROWS_DOWNWARD |
696 | p->size = frame_offset_old - frame_offset; | |
697 | #else | |
fc91b0d0 RK |
698 | p->size = size; |
699 | #endif | |
e5e809f4 | 700 | |
fc91b0d0 RK |
701 | /* Now define the fields used by combine_temp_slots. */ |
702 | #ifdef FRAME_GROWS_DOWNWARD | |
703 | p->base_offset = frame_offset; | |
704 | p->full_size = frame_offset_old - frame_offset; | |
705 | #else | |
706 | p->base_offset = frame_offset_old; | |
707 | p->full_size = frame_offset - frame_offset_old; | |
b2a80c0d | 708 | #endif |
e5e76139 | 709 | p->address = 0; |
6f086dfc RS |
710 | p->next = temp_slots; |
711 | temp_slots = p; | |
712 | } | |
713 | ||
714 | p->in_use = 1; | |
a25d4ba2 | 715 | p->addr_taken = 0; |
49ad7cfa | 716 | p->rtl_expr = seq_rtl_expr; |
a25d4ba2 | 717 | |
d93d4205 MS |
718 | if (keep == 2) |
719 | { | |
720 | p->level = target_temp_slot_level; | |
721 | p->keep = 0; | |
722 | } | |
e5e809f4 JL |
723 | else if (keep == 3) |
724 | { | |
725 | p->level = var_temp_slot_level; | |
726 | p->keep = 0; | |
727 | } | |
d93d4205 MS |
728 | else |
729 | { | |
730 | p->level = temp_slot_level; | |
731 | p->keep = keep; | |
732 | } | |
1995f267 RK |
733 | |
734 | /* We may be reusing an old slot, so clear any MEM flags that may have been | |
735 | set from before. */ | |
736 | RTX_UNCHANGING_P (p->slot) = 0; | |
737 | MEM_IN_STRUCT_P (p->slot) = 0; | |
c6df88cb MM |
738 | MEM_SCALAR_P (p->slot) = 0; |
739 | MEM_ALIAS_SET (p->slot) = 0; | |
6f086dfc RS |
740 | return p->slot; |
741 | } | |
d16790f2 JW |
742 | |
743 | /* Allocate a temporary stack slot and record it for possible later | |
744 | reuse. First three arguments are same as in preceding function. */ | |
745 | ||
746 | rtx | |
747 | assign_stack_temp (mode, size, keep) | |
748 | enum machine_mode mode; | |
749 | HOST_WIDE_INT size; | |
750 | int keep; | |
751 | { | |
752 | return assign_stack_temp_for_type (mode, size, keep, NULL_TREE); | |
753 | } | |
638141a6 | 754 | \f |
230f21b4 PB |
755 | /* Assign a temporary of given TYPE. |
756 | KEEP is as for assign_stack_temp. | |
757 | MEMORY_REQUIRED is 1 if the result must be addressable stack memory; | |
b55d9ff8 RK |
758 | it is 0 if a register is OK. |
759 | DONT_PROMOTE is 1 if we should not promote values in register | |
760 | to wider modes. */ | |
230f21b4 PB |
761 | |
762 | rtx | |
b55d9ff8 | 763 | assign_temp (type, keep, memory_required, dont_promote) |
230f21b4 PB |
764 | tree type; |
765 | int keep; | |
766 | int memory_required; | |
b55d9ff8 | 767 | int dont_promote; |
230f21b4 PB |
768 | { |
769 | enum machine_mode mode = TYPE_MODE (type); | |
638141a6 RK |
770 | int unsignedp = TREE_UNSIGNED (type); |
771 | ||
230f21b4 PB |
772 | if (mode == BLKmode || memory_required) |
773 | { | |
e5e809f4 | 774 | HOST_WIDE_INT size = int_size_in_bytes (type); |
230f21b4 PB |
775 | rtx tmp; |
776 | ||
777 | /* Unfortunately, we don't yet know how to allocate variable-sized | |
778 | temporaries. However, sometimes we have a fixed upper limit on | |
779 | the size (which is stored in TYPE_ARRAY_MAX_SIZE) and can use that | |
0f41302f | 780 | instead. This is the case for Chill variable-sized strings. */ |
230f21b4 PB |
781 | if (size == -1 && TREE_CODE (type) == ARRAY_TYPE |
782 | && TYPE_ARRAY_MAX_SIZE (type) != NULL_TREE | |
783 | && TREE_CODE (TYPE_ARRAY_MAX_SIZE (type)) == INTEGER_CST) | |
784 | size = TREE_INT_CST_LOW (TYPE_ARRAY_MAX_SIZE (type)); | |
785 | ||
d16790f2 | 786 | tmp = assign_stack_temp_for_type (mode, size, keep, type); |
c6df88cb | 787 | MEM_SET_IN_STRUCT_P (tmp, AGGREGATE_TYPE_P (type)); |
230f21b4 PB |
788 | return tmp; |
789 | } | |
638141a6 | 790 | |
230f21b4 | 791 | #ifndef PROMOTE_FOR_CALL_ONLY |
b55d9ff8 RK |
792 | if (! dont_promote) |
793 | mode = promote_mode (type, mode, &unsignedp, 0); | |
230f21b4 | 794 | #endif |
638141a6 | 795 | |
230f21b4 PB |
796 | return gen_reg_rtx (mode); |
797 | } | |
638141a6 | 798 | \f |
a45035b6 JW |
799 | /* Combine temporary stack slots which are adjacent on the stack. |
800 | ||
801 | This allows for better use of already allocated stack space. This is only | |
802 | done for BLKmode slots because we can be sure that we won't have alignment | |
803 | problems in this case. */ | |
804 | ||
805 | void | |
806 | combine_temp_slots () | |
807 | { | |
808 | struct temp_slot *p, *q; | |
809 | struct temp_slot *prev_p, *prev_q; | |
e5e809f4 JL |
810 | int num_slots; |
811 | ||
a4c6502a MM |
812 | /* We can't combine slots, because the information about which slot |
813 | is in which alias set will be lost. */ | |
814 | if (flag_strict_aliasing) | |
815 | return; | |
816 | ||
e5e809f4 JL |
817 | /* If there are a lot of temp slots, don't do anything unless |
818 | high levels of optimizaton. */ | |
819 | if (! flag_expensive_optimizations) | |
820 | for (p = temp_slots, num_slots = 0; p; p = p->next, num_slots++) | |
821 | if (num_slots > 100 || (num_slots > 10 && optimize == 0)) | |
822 | return; | |
a45035b6 | 823 | |
e9b7093a RS |
824 | for (p = temp_slots, prev_p = 0; p; p = prev_p ? prev_p->next : temp_slots) |
825 | { | |
826 | int delete_p = 0; | |
e5e809f4 | 827 | |
e9b7093a RS |
828 | if (! p->in_use && GET_MODE (p->slot) == BLKmode) |
829 | for (q = p->next, prev_q = p; q; q = prev_q->next) | |
a45035b6 | 830 | { |
e9b7093a RS |
831 | int delete_q = 0; |
832 | if (! q->in_use && GET_MODE (q->slot) == BLKmode) | |
a45035b6 | 833 | { |
fc91b0d0 | 834 | if (p->base_offset + p->full_size == q->base_offset) |
e9b7093a RS |
835 | { |
836 | /* Q comes after P; combine Q into P. */ | |
837 | p->size += q->size; | |
307d8cd6 | 838 | p->full_size += q->full_size; |
e9b7093a RS |
839 | delete_q = 1; |
840 | } | |
fc91b0d0 | 841 | else if (q->base_offset + q->full_size == p->base_offset) |
e9b7093a RS |
842 | { |
843 | /* P comes after Q; combine P into Q. */ | |
844 | q->size += p->size; | |
307d8cd6 | 845 | q->full_size += p->full_size; |
e9b7093a RS |
846 | delete_p = 1; |
847 | break; | |
848 | } | |
a45035b6 | 849 | } |
e9b7093a RS |
850 | /* Either delete Q or advance past it. */ |
851 | if (delete_q) | |
852 | prev_q->next = q->next; | |
853 | else | |
854 | prev_q = q; | |
a45035b6 | 855 | } |
e9b7093a RS |
856 | /* Either delete P or advance past it. */ |
857 | if (delete_p) | |
858 | { | |
859 | if (prev_p) | |
860 | prev_p->next = p->next; | |
861 | else | |
862 | temp_slots = p->next; | |
863 | } | |
864 | else | |
865 | prev_p = p; | |
866 | } | |
a45035b6 | 867 | } |
6f086dfc | 868 | \f |
e5e76139 RK |
869 | /* Find the temp slot corresponding to the object at address X. */ |
870 | ||
871 | static struct temp_slot * | |
872 | find_temp_slot_from_address (x) | |
873 | rtx x; | |
874 | { | |
875 | struct temp_slot *p; | |
876 | rtx next; | |
877 | ||
878 | for (p = temp_slots; p; p = p->next) | |
879 | { | |
880 | if (! p->in_use) | |
881 | continue; | |
e5e809f4 | 882 | |
e5e76139 | 883 | else if (XEXP (p->slot, 0) == x |
abb52246 RK |
884 | || p->address == x |
885 | || (GET_CODE (x) == PLUS | |
886 | && XEXP (x, 0) == virtual_stack_vars_rtx | |
887 | && GET_CODE (XEXP (x, 1)) == CONST_INT | |
888 | && INTVAL (XEXP (x, 1)) >= p->base_offset | |
889 | && INTVAL (XEXP (x, 1)) < p->base_offset + p->full_size)) | |
e5e76139 RK |
890 | return p; |
891 | ||
892 | else if (p->address != 0 && GET_CODE (p->address) == EXPR_LIST) | |
893 | for (next = p->address; next; next = XEXP (next, 1)) | |
894 | if (XEXP (next, 0) == x) | |
895 | return p; | |
896 | } | |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
9faa82d8 | 901 | /* Indicate that NEW is an alternate way of referring to the temp slot |
e5e809f4 | 902 | that previously was known by OLD. */ |
e5e76139 RK |
903 | |
904 | void | |
905 | update_temp_slot_address (old, new) | |
906 | rtx old, new; | |
907 | { | |
908 | struct temp_slot *p = find_temp_slot_from_address (old); | |
909 | ||
910 | /* If none, return. Else add NEW as an alias. */ | |
911 | if (p == 0) | |
912 | return; | |
913 | else if (p->address == 0) | |
914 | p->address = new; | |
915 | else | |
916 | { | |
917 | if (GET_CODE (p->address) != EXPR_LIST) | |
38a448ca | 918 | p->address = gen_rtx_EXPR_LIST (VOIDmode, p->address, NULL_RTX); |
e5e76139 | 919 | |
38a448ca | 920 | p->address = gen_rtx_EXPR_LIST (VOIDmode, new, p->address); |
e5e76139 RK |
921 | } |
922 | } | |
923 | ||
a25d4ba2 | 924 | /* If X could be a reference to a temporary slot, mark the fact that its |
9faa82d8 | 925 | address was taken. */ |
a25d4ba2 RK |
926 | |
927 | void | |
928 | mark_temp_addr_taken (x) | |
929 | rtx x; | |
930 | { | |
931 | struct temp_slot *p; | |
932 | ||
933 | if (x == 0) | |
934 | return; | |
935 | ||
936 | /* If X is not in memory or is at a constant address, it cannot be in | |
937 | a temporary slot. */ | |
938 | if (GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0))) | |
939 | return; | |
940 | ||
941 | p = find_temp_slot_from_address (XEXP (x, 0)); | |
942 | if (p != 0) | |
943 | p->addr_taken = 1; | |
944 | } | |
945 | ||
9cca6a99 MS |
946 | /* If X could be a reference to a temporary slot, mark that slot as |
947 | belonging to the to one level higher than the current level. If X | |
948 | matched one of our slots, just mark that one. Otherwise, we can't | |
949 | easily predict which it is, so upgrade all of them. Kept slots | |
950 | need not be touched. | |
6f086dfc RS |
951 | |
952 | This is called when an ({...}) construct occurs and a statement | |
953 | returns a value in memory. */ | |
954 | ||
955 | void | |
956 | preserve_temp_slots (x) | |
957 | rtx x; | |
958 | { | |
a25d4ba2 | 959 | struct temp_slot *p = 0; |
6f086dfc | 960 | |
73620b82 RK |
961 | /* If there is no result, we still might have some objects whose address |
962 | were taken, so we need to make sure they stay around. */ | |
e3a77161 | 963 | if (x == 0) |
73620b82 RK |
964 | { |
965 | for (p = temp_slots; p; p = p->next) | |
966 | if (p->in_use && p->level == temp_slot_level && p->addr_taken) | |
967 | p->level--; | |
968 | ||
969 | return; | |
970 | } | |
e3a77161 RK |
971 | |
972 | /* If X is a register that is being used as a pointer, see if we have | |
973 | a temporary slot we know it points to. To be consistent with | |
974 | the code below, we really should preserve all non-kept slots | |
975 | if we can't find a match, but that seems to be much too costly. */ | |
a25d4ba2 RK |
976 | if (GET_CODE (x) == REG && REGNO_POINTER_FLAG (REGNO (x))) |
977 | p = find_temp_slot_from_address (x); | |
978 | ||
6f086dfc | 979 | /* If X is not in memory or is at a constant address, it cannot be in |
e19571db RK |
980 | a temporary slot, but it can contain something whose address was |
981 | taken. */ | |
a25d4ba2 | 982 | if (p == 0 && (GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0)))) |
e19571db RK |
983 | { |
984 | for (p = temp_slots; p; p = p->next) | |
985 | if (p->in_use && p->level == temp_slot_level && p->addr_taken) | |
986 | p->level--; | |
987 | ||
988 | return; | |
989 | } | |
6f086dfc RS |
990 | |
991 | /* First see if we can find a match. */ | |
73620b82 | 992 | if (p == 0) |
a25d4ba2 RK |
993 | p = find_temp_slot_from_address (XEXP (x, 0)); |
994 | ||
e5e76139 RK |
995 | if (p != 0) |
996 | { | |
a25d4ba2 RK |
997 | /* Move everything at our level whose address was taken to our new |
998 | level in case we used its address. */ | |
999 | struct temp_slot *q; | |
1000 | ||
9cca6a99 MS |
1001 | if (p->level == temp_slot_level) |
1002 | { | |
1003 | for (q = temp_slots; q; q = q->next) | |
1004 | if (q != p && q->addr_taken && q->level == p->level) | |
1005 | q->level--; | |
a25d4ba2 | 1006 | |
9cca6a99 MS |
1007 | p->level--; |
1008 | p->addr_taken = 0; | |
1009 | } | |
e5e76139 RK |
1010 | return; |
1011 | } | |
6f086dfc RS |
1012 | |
1013 | /* Otherwise, preserve all non-kept slots at this level. */ | |
1014 | for (p = temp_slots; p; p = p->next) | |
1015 | if (p->in_use && p->level == temp_slot_level && ! p->keep) | |
1016 | p->level--; | |
1017 | } | |
1018 | ||
422c8f63 RK |
1019 | /* X is the result of an RTL_EXPR. If it is a temporary slot associated |
1020 | with that RTL_EXPR, promote it into a temporary slot at the present | |
1021 | level so it will not be freed when we free slots made in the | |
1022 | RTL_EXPR. */ | |
1023 | ||
1024 | void | |
1025 | preserve_rtl_expr_result (x) | |
1026 | rtx x; | |
1027 | { | |
1028 | struct temp_slot *p; | |
1029 | ||
1030 | /* If X is not in memory or is at a constant address, it cannot be in | |
1031 | a temporary slot. */ | |
1032 | if (x == 0 || GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0))) | |
1033 | return; | |
1034 | ||
199b61d8 RK |
1035 | /* If we can find a match, move it to our level unless it is already at |
1036 | an upper level. */ | |
1037 | p = find_temp_slot_from_address (XEXP (x, 0)); | |
1038 | if (p != 0) | |
1039 | { | |
1040 | p->level = MIN (p->level, temp_slot_level); | |
1041 | p->rtl_expr = 0; | |
1042 | } | |
422c8f63 RK |
1043 | |
1044 | return; | |
1045 | } | |
1046 | ||
6f086dfc | 1047 | /* Free all temporaries used so far. This is normally called at the end |
e7a84011 RK |
1048 | of generating code for a statement. Don't free any temporaries |
1049 | currently in use for an RTL_EXPR that hasn't yet been emitted. | |
1050 | We could eventually do better than this since it can be reused while | |
1051 | generating the same RTL_EXPR, but this is complex and probably not | |
1052 | worthwhile. */ | |
6f086dfc RS |
1053 | |
1054 | void | |
1055 | free_temp_slots () | |
1056 | { | |
1057 | struct temp_slot *p; | |
1058 | ||
1059 | for (p = temp_slots; p; p = p->next) | |
e7a84011 RK |
1060 | if (p->in_use && p->level == temp_slot_level && ! p->keep |
1061 | && p->rtl_expr == 0) | |
1062 | p->in_use = 0; | |
1063 | ||
1064 | combine_temp_slots (); | |
1065 | } | |
1066 | ||
1067 | /* Free all temporary slots used in T, an RTL_EXPR node. */ | |
1068 | ||
1069 | void | |
1070 | free_temps_for_rtl_expr (t) | |
1071 | tree t; | |
1072 | { | |
1073 | struct temp_slot *p; | |
1074 | ||
1075 | for (p = temp_slots; p; p = p->next) | |
1076 | if (p->rtl_expr == t) | |
6f086dfc | 1077 | p->in_use = 0; |
a45035b6 JW |
1078 | |
1079 | combine_temp_slots (); | |
6f086dfc RS |
1080 | } |
1081 | ||
956d6950 | 1082 | /* Mark all temporaries ever allocated in this function as not suitable |
a94e4054 RK |
1083 | for reuse until the current level is exited. */ |
1084 | ||
1085 | void | |
1086 | mark_all_temps_used () | |
1087 | { | |
1088 | struct temp_slot *p; | |
1089 | ||
1090 | for (p = temp_slots; p; p = p->next) | |
1091 | { | |
85b119d1 | 1092 | p->in_use = p->keep = 1; |
27ce006b | 1093 | p->level = MIN (p->level, temp_slot_level); |
a94e4054 RK |
1094 | } |
1095 | } | |
1096 | ||
6f086dfc RS |
1097 | /* Push deeper into the nesting level for stack temporaries. */ |
1098 | ||
1099 | void | |
1100 | push_temp_slots () | |
1101 | { | |
6f086dfc RS |
1102 | temp_slot_level++; |
1103 | } | |
1104 | ||
e5e809f4 JL |
1105 | /* Likewise, but save the new level as the place to allocate variables |
1106 | for blocks. */ | |
1107 | ||
1108 | void | |
1109 | push_temp_slots_for_block () | |
1110 | { | |
1111 | push_temp_slots (); | |
1112 | ||
1113 | var_temp_slot_level = temp_slot_level; | |
1114 | } | |
1115 | ||
f5963e61 JL |
1116 | /* Likewise, but save the new level as the place to allocate temporaries |
1117 | for TARGET_EXPRs. */ | |
1118 | ||
1119 | void | |
1120 | push_temp_slots_for_target () | |
1121 | { | |
1122 | push_temp_slots (); | |
1123 | ||
1124 | target_temp_slot_level = temp_slot_level; | |
1125 | } | |
1126 | ||
1127 | /* Set and get the value of target_temp_slot_level. The only | |
1128 | permitted use of these functions is to save and restore this value. */ | |
1129 | ||
1130 | int | |
1131 | get_target_temp_slot_level () | |
1132 | { | |
1133 | return target_temp_slot_level; | |
1134 | } | |
1135 | ||
1136 | void | |
1137 | set_target_temp_slot_level (level) | |
1138 | int level; | |
1139 | { | |
1140 | target_temp_slot_level = level; | |
1141 | } | |
1142 | ||
6f086dfc RS |
1143 | /* Pop a temporary nesting level. All slots in use in the current level |
1144 | are freed. */ | |
1145 | ||
1146 | void | |
1147 | pop_temp_slots () | |
1148 | { | |
1149 | struct temp_slot *p; | |
1150 | ||
6f086dfc | 1151 | for (p = temp_slots; p; p = p->next) |
e7a84011 | 1152 | if (p->in_use && p->level == temp_slot_level && p->rtl_expr == 0) |
6f086dfc RS |
1153 | p->in_use = 0; |
1154 | ||
a45035b6 JW |
1155 | combine_temp_slots (); |
1156 | ||
6f086dfc RS |
1157 | temp_slot_level--; |
1158 | } | |
bc0ebdf9 RK |
1159 | |
1160 | /* Initialize temporary slots. */ | |
1161 | ||
1162 | void | |
1163 | init_temp_slots () | |
1164 | { | |
1165 | /* We have not allocated any temporaries yet. */ | |
1166 | temp_slots = 0; | |
1167 | temp_slot_level = 0; | |
e5e809f4 | 1168 | var_temp_slot_level = 0; |
bc0ebdf9 RK |
1169 | target_temp_slot_level = 0; |
1170 | } | |
6f086dfc RS |
1171 | \f |
1172 | /* Retroactively move an auto variable from a register to a stack slot. | |
1173 | This is done when an address-reference to the variable is seen. */ | |
1174 | ||
1175 | void | |
1176 | put_var_into_stack (decl) | |
1177 | tree decl; | |
1178 | { | |
1179 | register rtx reg; | |
00d8a4c1 | 1180 | enum machine_mode promoted_mode, decl_mode; |
6f086dfc | 1181 | struct function *function = 0; |
c20bf1f3 | 1182 | tree context; |
e9a25f70 | 1183 | int can_use_addressof; |
c20bf1f3 | 1184 | |
c20bf1f3 | 1185 | context = decl_function_context (decl); |
6f086dfc | 1186 | |
9ec36da5 | 1187 | /* Get the current rtl used for this object and its original mode. */ |
6f086dfc | 1188 | reg = TREE_CODE (decl) == SAVE_EXPR ? SAVE_EXPR_RTL (decl) : DECL_RTL (decl); |
2baccce2 RS |
1189 | |
1190 | /* No need to do anything if decl has no rtx yet | |
1191 | since in that case caller is setting TREE_ADDRESSABLE | |
1192 | and a stack slot will be assigned when the rtl is made. */ | |
1193 | if (reg == 0) | |
1194 | return; | |
00d8a4c1 RK |
1195 | |
1196 | /* Get the declared mode for this object. */ | |
1197 | decl_mode = (TREE_CODE (decl) == SAVE_EXPR ? TYPE_MODE (TREE_TYPE (decl)) | |
1198 | : DECL_MODE (decl)); | |
2baccce2 RS |
1199 | /* Get the mode it's actually stored in. */ |
1200 | promoted_mode = GET_MODE (reg); | |
6f086dfc RS |
1201 | |
1202 | /* If this variable comes from an outer function, | |
1203 | find that function's saved context. */ | |
4ac74fb8 | 1204 | if (context != current_function_decl && context != inline_function_decl) |
6f086dfc RS |
1205 | for (function = outer_function_chain; function; function = function->next) |
1206 | if (function->decl == context) | |
1207 | break; | |
1208 | ||
6f086dfc RS |
1209 | /* If this is a variable-size object with a pseudo to address it, |
1210 | put that pseudo into the stack, if the var is nonlocal. */ | |
a82ad570 | 1211 | if (DECL_NONLOCAL (decl) |
6f086dfc RS |
1212 | && GET_CODE (reg) == MEM |
1213 | && GET_CODE (XEXP (reg, 0)) == REG | |
1214 | && REGNO (XEXP (reg, 0)) > LAST_VIRTUAL_REGISTER) | |
4cdb3e78 RS |
1215 | { |
1216 | reg = XEXP (reg, 0); | |
1217 | decl_mode = promoted_mode = GET_MODE (reg); | |
1218 | } | |
e15762df | 1219 | |
e9a25f70 JL |
1220 | can_use_addressof |
1221 | = (function == 0 | |
e5e809f4 | 1222 | && optimize > 0 |
e9a25f70 JL |
1223 | /* FIXME make it work for promoted modes too */ |
1224 | && decl_mode == promoted_mode | |
1225 | #ifdef NON_SAVING_SETJMP | |
1226 | && ! (NON_SAVING_SETJMP && current_function_calls_setjmp) | |
1227 | #endif | |
1228 | ); | |
1229 | ||
1230 | /* If we can't use ADDRESSOF, make sure we see through one we already | |
1231 | generated. */ | |
1232 | if (! can_use_addressof && GET_CODE (reg) == MEM | |
1233 | && GET_CODE (XEXP (reg, 0)) == ADDRESSOF) | |
1234 | reg = XEXP (XEXP (reg, 0), 0); | |
1235 | ||
293e3de4 RS |
1236 | /* Now we should have a value that resides in one or more pseudo regs. */ |
1237 | ||
1238 | if (GET_CODE (reg) == REG) | |
e9a25f70 JL |
1239 | { |
1240 | /* If this variable lives in the current function and we don't need | |
1241 | to put things in the stack for the sake of setjmp, try to keep it | |
1242 | in a register until we know we actually need the address. */ | |
1243 | if (can_use_addressof) | |
1244 | gen_mem_addressof (reg, decl); | |
1245 | else | |
1246 | put_reg_into_stack (function, reg, TREE_TYPE (decl), | |
1247 | promoted_mode, decl_mode, | |
e5e809f4 | 1248 | TREE_SIDE_EFFECTS (decl), 0, |
fe9b4957 MM |
1249 | TREE_USED (decl) || DECL_INITIAL (decl) != 0, |
1250 | 0); | |
e9a25f70 | 1251 | } |
293e3de4 RS |
1252 | else if (GET_CODE (reg) == CONCAT) |
1253 | { | |
1254 | /* A CONCAT contains two pseudos; put them both in the stack. | |
1255 | We do it so they end up consecutive. */ | |
1256 | enum machine_mode part_mode = GET_MODE (XEXP (reg, 0)); | |
1257 | tree part_type = TREE_TYPE (TREE_TYPE (decl)); | |
4738c10d | 1258 | #ifdef FRAME_GROWS_DOWNWARD |
293e3de4 | 1259 | /* Since part 0 should have a lower address, do it second. */ |
0006e95b | 1260 | put_reg_into_stack (function, XEXP (reg, 1), part_type, part_mode, |
e5e809f4 | 1261 | part_mode, TREE_SIDE_EFFECTS (decl), 0, |
fe9b4957 MM |
1262 | TREE_USED (decl) || DECL_INITIAL (decl) != 0, |
1263 | 0); | |
0006e95b | 1264 | put_reg_into_stack (function, XEXP (reg, 0), part_type, part_mode, |
e5e809f4 | 1265 | part_mode, TREE_SIDE_EFFECTS (decl), 0, |
fe9b4957 MM |
1266 | TREE_USED (decl) || DECL_INITIAL (decl) != 0, |
1267 | 0); | |
293e3de4 | 1268 | #else |
0006e95b | 1269 | put_reg_into_stack (function, XEXP (reg, 0), part_type, part_mode, |
e5e809f4 | 1270 | part_mode, TREE_SIDE_EFFECTS (decl), 0, |
fe9b4957 MM |
1271 | TREE_USED (decl) || DECL_INITIAL (decl) != 0, |
1272 | 0); | |
0006e95b | 1273 | put_reg_into_stack (function, XEXP (reg, 1), part_type, part_mode, |
e5e809f4 | 1274 | part_mode, TREE_SIDE_EFFECTS (decl), 0, |
fe9b4957 MM |
1275 | TREE_USED (decl) || DECL_INITIAL (decl) != 0, |
1276 | 0); | |
293e3de4 RS |
1277 | #endif |
1278 | ||
1279 | /* Change the CONCAT into a combined MEM for both parts. */ | |
1280 | PUT_CODE (reg, MEM); | |
0006e95b | 1281 | MEM_VOLATILE_P (reg) = MEM_VOLATILE_P (XEXP (reg, 0)); |
41472af8 | 1282 | MEM_ALIAS_SET (reg) = get_alias_set (decl); |
0006e95b | 1283 | |
293e3de4 RS |
1284 | /* The two parts are in memory order already. |
1285 | Use the lower parts address as ours. */ | |
1286 | XEXP (reg, 0) = XEXP (XEXP (reg, 0), 0); | |
1287 | /* Prevent sharing of rtl that might lose. */ | |
1288 | if (GET_CODE (XEXP (reg, 0)) == PLUS) | |
1289 | XEXP (reg, 0) = copy_rtx (XEXP (reg, 0)); | |
1290 | } | |
86fa911a RK |
1291 | else |
1292 | return; | |
1293 | ||
7d384cc0 | 1294 | if (current_function_check_memory_usage) |
86fa911a | 1295 | emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3, |
6a9c4aed | 1296 | XEXP (reg, 0), Pmode, |
86fa911a RK |
1297 | GEN_INT (GET_MODE_SIZE (GET_MODE (reg))), |
1298 | TYPE_MODE (sizetype), | |
956d6950 JL |
1299 | GEN_INT (MEMORY_USE_RW), |
1300 | TYPE_MODE (integer_type_node)); | |
293e3de4 RS |
1301 | } |
1302 | ||
1303 | /* Subroutine of put_var_into_stack. This puts a single pseudo reg REG | |
1304 | into the stack frame of FUNCTION (0 means the current function). | |
1305 | DECL_MODE is the machine mode of the user-level data type. | |
0006e95b | 1306 | PROMOTED_MODE is the machine mode of the register. |
e5e809f4 JL |
1307 | VOLATILE_P is nonzero if this is for a "volatile" decl. |
1308 | USED_P is nonzero if this reg might have already been used in an insn. */ | |
293e3de4 RS |
1309 | |
1310 | static void | |
e9a25f70 | 1311 | put_reg_into_stack (function, reg, type, promoted_mode, decl_mode, volatile_p, |
fe9b4957 | 1312 | original_regno, used_p, ht) |
293e3de4 RS |
1313 | struct function *function; |
1314 | rtx reg; | |
1315 | tree type; | |
1316 | enum machine_mode promoted_mode, decl_mode; | |
0006e95b | 1317 | int volatile_p; |
e9a25f70 | 1318 | int original_regno; |
e5e809f4 | 1319 | int used_p; |
fe9b4957 | 1320 | struct hash_table *ht; |
293e3de4 RS |
1321 | { |
1322 | rtx new = 0; | |
e9a25f70 JL |
1323 | int regno = original_regno; |
1324 | ||
1325 | if (regno == 0) | |
1326 | regno = REGNO (reg); | |
6f086dfc RS |
1327 | |
1328 | if (function) | |
1329 | { | |
49ad7cfa BS |
1330 | if (regno < function->x_max_parm_reg) |
1331 | new = function->x_parm_reg_stack_loc[regno]; | |
6f086dfc | 1332 | if (new == 0) |
e15762df | 1333 | new = assign_outer_stack_local (decl_mode, GET_MODE_SIZE (decl_mode), |
6f086dfc RS |
1334 | 0, function); |
1335 | } | |
1336 | else | |
1337 | { | |
e9a25f70 JL |
1338 | if (regno < max_parm_reg) |
1339 | new = parm_reg_stack_loc[regno]; | |
6f086dfc | 1340 | if (new == 0) |
e15762df | 1341 | new = assign_stack_local (decl_mode, GET_MODE_SIZE (decl_mode), 0); |
6f086dfc RS |
1342 | } |
1343 | ||
0006e95b | 1344 | PUT_MODE (reg, decl_mode); |
6f086dfc RS |
1345 | XEXP (reg, 0) = XEXP (new, 0); |
1346 | /* `volatil' bit means one thing for MEMs, another entirely for REGs. */ | |
0006e95b | 1347 | MEM_VOLATILE_P (reg) = volatile_p; |
6f086dfc RS |
1348 | PUT_CODE (reg, MEM); |
1349 | ||
1350 | /* If this is a memory ref that contains aggregate components, | |
bdd3e6ab JW |
1351 | mark it as such for cse and loop optimize. If we are reusing a |
1352 | previously generated stack slot, then we need to copy the bit in | |
1353 | case it was set for other reasons. For instance, it is set for | |
1354 | __builtin_va_alist. */ | |
c6df88cb MM |
1355 | MEM_SET_IN_STRUCT_P (reg, |
1356 | AGGREGATE_TYPE_P (type) || MEM_IN_STRUCT_P (new)); | |
41472af8 | 1357 | MEM_ALIAS_SET (reg) = get_alias_set (type); |
6f086dfc RS |
1358 | |
1359 | /* Now make sure that all refs to the variable, previously made | |
1360 | when it was a register, are fixed up to be valid again. */ | |
e5e809f4 JL |
1361 | |
1362 | if (used_p && function != 0) | |
6f086dfc RS |
1363 | { |
1364 | struct var_refs_queue *temp; | |
1365 | ||
1366 | /* Variable is inherited; fix it up when we get back to its function. */ | |
1367 | push_obstacks (function->function_obstack, | |
1368 | function->function_maybepermanent_obstack); | |
4da73fa0 RK |
1369 | |
1370 | /* See comment in restore_tree_status in tree.c for why this needs to be | |
1371 | on saveable obstack. */ | |
6f086dfc | 1372 | temp |
4da73fa0 | 1373 | = (struct var_refs_queue *) savealloc (sizeof (struct var_refs_queue)); |
6f086dfc | 1374 | temp->modified = reg; |
00d8a4c1 | 1375 | temp->promoted_mode = promoted_mode; |
293e3de4 | 1376 | temp->unsignedp = TREE_UNSIGNED (type); |
6f086dfc RS |
1377 | temp->next = function->fixup_var_refs_queue; |
1378 | function->fixup_var_refs_queue = temp; | |
1379 | pop_obstacks (); | |
1380 | } | |
e5e809f4 | 1381 | else if (used_p) |
6f086dfc | 1382 | /* Variable is local; fix it up now. */ |
fe9b4957 | 1383 | fixup_var_refs (reg, promoted_mode, TREE_UNSIGNED (type), ht); |
6f086dfc RS |
1384 | } |
1385 | \f | |
1386 | static void | |
fe9b4957 | 1387 | fixup_var_refs (var, promoted_mode, unsignedp, ht) |
6f086dfc | 1388 | rtx var; |
00d8a4c1 RK |
1389 | enum machine_mode promoted_mode; |
1390 | int unsignedp; | |
fe9b4957 | 1391 | struct hash_table *ht; |
6f086dfc RS |
1392 | { |
1393 | tree pending; | |
1394 | rtx first_insn = get_insns (); | |
49ad7cfa | 1395 | struct sequence_stack *stack = seq_stack; |
6f086dfc RS |
1396 | tree rtl_exps = rtl_expr_chain; |
1397 | ||
1398 | /* Must scan all insns for stack-refs that exceed the limit. */ | |
fe9b4957 MM |
1399 | fixup_var_refs_insns (var, promoted_mode, unsignedp, first_insn, |
1400 | stack == 0, ht); | |
1401 | /* If there's a hash table, it must record all uses of VAR. */ | |
1402 | if (ht) | |
1403 | return; | |
6f086dfc RS |
1404 | |
1405 | /* Scan all pending sequences too. */ | |
1406 | for (; stack; stack = stack->next) | |
1407 | { | |
1408 | push_to_sequence (stack->first); | |
00d8a4c1 | 1409 | fixup_var_refs_insns (var, promoted_mode, unsignedp, |
fe9b4957 | 1410 | stack->first, stack->next != 0, 0); |
6f086dfc RS |
1411 | /* Update remembered end of sequence |
1412 | in case we added an insn at the end. */ | |
1413 | stack->last = get_last_insn (); | |
1414 | end_sequence (); | |
1415 | } | |
1416 | ||
1417 | /* Scan all waiting RTL_EXPRs too. */ | |
1418 | for (pending = rtl_exps; pending; pending = TREE_CHAIN (pending)) | |
1419 | { | |
1420 | rtx seq = RTL_EXPR_SEQUENCE (TREE_VALUE (pending)); | |
1421 | if (seq != const0_rtx && seq != 0) | |
1422 | { | |
1423 | push_to_sequence (seq); | |
fe9b4957 MM |
1424 | fixup_var_refs_insns (var, promoted_mode, unsignedp, seq, 0, |
1425 | 0); | |
6f086dfc RS |
1426 | end_sequence (); |
1427 | } | |
1428 | } | |
d33c2956 DB |
1429 | |
1430 | /* Scan the catch clauses for exception handling too. */ | |
1431 | push_to_sequence (catch_clauses); | |
fe9b4957 MM |
1432 | fixup_var_refs_insns (var, promoted_mode, unsignedp, catch_clauses, |
1433 | 0, 0); | |
d33c2956 | 1434 | end_sequence (); |
6f086dfc RS |
1435 | } |
1436 | \f | |
e15679f8 | 1437 | /* REPLACEMENTS is a pointer to a list of the struct fixup_replacement and X is |
6f086dfc | 1438 | some part of an insn. Return a struct fixup_replacement whose OLD |
0f41302f | 1439 | value is equal to X. Allocate a new structure if no such entry exists. */ |
6f086dfc RS |
1440 | |
1441 | static struct fixup_replacement * | |
2740a678 | 1442 | find_fixup_replacement (replacements, x) |
6f086dfc RS |
1443 | struct fixup_replacement **replacements; |
1444 | rtx x; | |
1445 | { | |
1446 | struct fixup_replacement *p; | |
1447 | ||
1448 | /* See if we have already replaced this. */ | |
1449 | for (p = *replacements; p && p->old != x; p = p->next) | |
1450 | ; | |
1451 | ||
1452 | if (p == 0) | |
1453 | { | |
1454 | p = (struct fixup_replacement *) oballoc (sizeof (struct fixup_replacement)); | |
1455 | p->old = x; | |
1456 | p->new = 0; | |
1457 | p->next = *replacements; | |
1458 | *replacements = p; | |
1459 | } | |
1460 | ||
1461 | return p; | |
1462 | } | |
1463 | ||
1464 | /* Scan the insn-chain starting with INSN for refs to VAR | |
1465 | and fix them up. TOPLEVEL is nonzero if this chain is the | |
1466 | main chain of insns for the current function. */ | |
1467 | ||
1468 | static void | |
fe9b4957 | 1469 | fixup_var_refs_insns (var, promoted_mode, unsignedp, insn, toplevel, ht) |
6f086dfc | 1470 | rtx var; |
00d8a4c1 RK |
1471 | enum machine_mode promoted_mode; |
1472 | int unsignedp; | |
6f086dfc RS |
1473 | rtx insn; |
1474 | int toplevel; | |
fe9b4957 | 1475 | struct hash_table *ht; |
6f086dfc | 1476 | { |
02a10449 | 1477 | rtx call_dest = 0; |
07444f1d | 1478 | rtx insn_list = NULL_RTX; |
fe9b4957 MM |
1479 | |
1480 | /* If we already know which INSNs reference VAR there's no need | |
1481 | to walk the entire instruction chain. */ | |
1482 | if (ht) | |
1483 | { | |
1484 | insn_list = ((struct insns_for_mem_entry *) | |
1485 | hash_lookup (ht, var, /*create=*/0, /*copy=*/0))->insns; | |
1486 | insn = insn_list ? XEXP (insn_list, 0) : NULL_RTX; | |
1487 | insn_list = XEXP (insn_list, 1); | |
1488 | } | |
02a10449 | 1489 | |
6f086dfc RS |
1490 | while (insn) |
1491 | { | |
1492 | rtx next = NEXT_INSN (insn); | |
e5e809f4 | 1493 | rtx set, prev, prev_set; |
6f086dfc | 1494 | rtx note; |
e5e809f4 | 1495 | |
e15762df | 1496 | if (GET_RTX_CLASS (GET_CODE (insn)) == 'i') |
6f086dfc | 1497 | { |
63770d6a RK |
1498 | /* If this is a CLOBBER of VAR, delete it. |
1499 | ||
1500 | If it has a REG_LIBCALL note, delete the REG_LIBCALL | |
1501 | and REG_RETVAL notes too. */ | |
926d1ca5 | 1502 | if (GET_CODE (PATTERN (insn)) == CLOBBER |
07362cb3 JW |
1503 | && (XEXP (PATTERN (insn), 0) == var |
1504 | || (GET_CODE (XEXP (PATTERN (insn), 0)) == CONCAT | |
1505 | && (XEXP (XEXP (PATTERN (insn), 0), 0) == var | |
1506 | || XEXP (XEXP (PATTERN (insn), 0), 1) == var)))) | |
63770d6a RK |
1507 | { |
1508 | if ((note = find_reg_note (insn, REG_LIBCALL, NULL_RTX)) != 0) | |
1509 | /* The REG_LIBCALL note will go away since we are going to | |
1510 | turn INSN into a NOTE, so just delete the | |
1511 | corresponding REG_RETVAL note. */ | |
1512 | remove_note (XEXP (note, 0), | |
1513 | find_reg_note (XEXP (note, 0), REG_RETVAL, | |
1514 | NULL_RTX)); | |
1515 | ||
1516 | /* In unoptimized compilation, we shouldn't call delete_insn | |
1517 | except in jump.c doing warnings. */ | |
1518 | PUT_CODE (insn, NOTE); | |
1519 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
1520 | NOTE_SOURCE_FILE (insn) = 0; | |
1521 | } | |
1522 | ||
6f086dfc | 1523 | /* The insn to load VAR from a home in the arglist |
e5e809f4 JL |
1524 | is now a no-op. When we see it, just delete it. |
1525 | Similarly if this is storing VAR from a register from which | |
1526 | it was loaded in the previous insn. This will occur | |
1527 | when an ADDRESSOF was made for an arglist slot. */ | |
63770d6a | 1528 | else if (toplevel |
e5e809f4 JL |
1529 | && (set = single_set (insn)) != 0 |
1530 | && SET_DEST (set) == var | |
63770d6a RK |
1531 | /* If this represents the result of an insn group, |
1532 | don't delete the insn. */ | |
1533 | && find_reg_note (insn, REG_RETVAL, NULL_RTX) == 0 | |
e5e809f4 JL |
1534 | && (rtx_equal_p (SET_SRC (set), var) |
1535 | || (GET_CODE (SET_SRC (set)) == REG | |
1536 | && (prev = prev_nonnote_insn (insn)) != 0 | |
1537 | && (prev_set = single_set (prev)) != 0 | |
1538 | && SET_DEST (prev_set) == SET_SRC (set) | |
1539 | && rtx_equal_p (SET_SRC (prev_set), var)))) | |
6f086dfc | 1540 | { |
b4ff474c RS |
1541 | /* In unoptimized compilation, we shouldn't call delete_insn |
1542 | except in jump.c doing warnings. */ | |
1543 | PUT_CODE (insn, NOTE); | |
1544 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
1545 | NOTE_SOURCE_FILE (insn) = 0; | |
6f086dfc RS |
1546 | if (insn == last_parm_insn) |
1547 | last_parm_insn = PREV_INSN (next); | |
1548 | } | |
1549 | else | |
1550 | { | |
02a10449 RK |
1551 | struct fixup_replacement *replacements = 0; |
1552 | rtx next_insn = NEXT_INSN (insn); | |
1553 | ||
e9a25f70 JL |
1554 | if (SMALL_REGISTER_CLASSES) |
1555 | { | |
1556 | /* If the insn that copies the results of a CALL_INSN | |
1557 | into a pseudo now references VAR, we have to use an | |
1558 | intermediate pseudo since we want the life of the | |
1559 | return value register to be only a single insn. | |
02a10449 | 1560 | |
e9a25f70 JL |
1561 | If we don't use an intermediate pseudo, such things as |
1562 | address computations to make the address of VAR valid | |
1563 | if it is not can be placed between the CALL_INSN and INSN. | |
02a10449 | 1564 | |
e9a25f70 JL |
1565 | To make sure this doesn't happen, we record the destination |
1566 | of the CALL_INSN and see if the next insn uses both that | |
1567 | and VAR. */ | |
02a10449 | 1568 | |
f95182a4 ILT |
1569 | if (call_dest != 0 && GET_CODE (insn) == INSN |
1570 | && reg_mentioned_p (var, PATTERN (insn)) | |
1571 | && reg_mentioned_p (call_dest, PATTERN (insn))) | |
1572 | { | |
1573 | rtx temp = gen_reg_rtx (GET_MODE (call_dest)); | |
02a10449 | 1574 | |
f95182a4 | 1575 | emit_insn_before (gen_move_insn (temp, call_dest), insn); |
02a10449 | 1576 | |
f95182a4 ILT |
1577 | PATTERN (insn) = replace_rtx (PATTERN (insn), |
1578 | call_dest, temp); | |
1579 | } | |
02a10449 | 1580 | |
f95182a4 ILT |
1581 | if (GET_CODE (insn) == CALL_INSN |
1582 | && GET_CODE (PATTERN (insn)) == SET) | |
1583 | call_dest = SET_DEST (PATTERN (insn)); | |
1584 | else if (GET_CODE (insn) == CALL_INSN | |
1585 | && GET_CODE (PATTERN (insn)) == PARALLEL | |
1586 | && GET_CODE (XVECEXP (PATTERN (insn), 0, 0)) == SET) | |
1587 | call_dest = SET_DEST (XVECEXP (PATTERN (insn), 0, 0)); | |
1588 | else | |
1589 | call_dest = 0; | |
1590 | } | |
02a10449 | 1591 | |
6f086dfc RS |
1592 | /* See if we have to do anything to INSN now that VAR is in |
1593 | memory. If it needs to be loaded into a pseudo, use a single | |
1594 | pseudo for the entire insn in case there is a MATCH_DUP | |
1595 | between two operands. We pass a pointer to the head of | |
1596 | a list of struct fixup_replacements. If fixup_var_refs_1 | |
1597 | needs to allocate pseudos or replacement MEMs (for SUBREGs), | |
1598 | it will record them in this list. | |
1599 | ||
1600 | If it allocated a pseudo for any replacement, we copy into | |
1601 | it here. */ | |
1602 | ||
00d8a4c1 RK |
1603 | fixup_var_refs_1 (var, promoted_mode, &PATTERN (insn), insn, |
1604 | &replacements); | |
6f086dfc | 1605 | |
77121fee JW |
1606 | /* If this is last_parm_insn, and any instructions were output |
1607 | after it to fix it up, then we must set last_parm_insn to | |
1608 | the last such instruction emitted. */ | |
1609 | if (insn == last_parm_insn) | |
1610 | last_parm_insn = PREV_INSN (next_insn); | |
1611 | ||
6f086dfc RS |
1612 | while (replacements) |
1613 | { | |
1614 | if (GET_CODE (replacements->new) == REG) | |
1615 | { | |
1616 | rtx insert_before; | |
00d8a4c1 | 1617 | rtx seq; |
6f086dfc RS |
1618 | |
1619 | /* OLD might be a (subreg (mem)). */ | |
1620 | if (GET_CODE (replacements->old) == SUBREG) | |
1621 | replacements->old | |
1622 | = fixup_memory_subreg (replacements->old, insn, 0); | |
1623 | else | |
1624 | replacements->old | |
1625 | = fixup_stack_1 (replacements->old, insn); | |
1626 | ||
5fa7422b | 1627 | insert_before = insn; |
6f086dfc | 1628 | |
00d8a4c1 RK |
1629 | /* If we are changing the mode, do a conversion. |
1630 | This might be wasteful, but combine.c will | |
1631 | eliminate much of the waste. */ | |
1632 | ||
1633 | if (GET_MODE (replacements->new) | |
1634 | != GET_MODE (replacements->old)) | |
1635 | { | |
1636 | start_sequence (); | |
1637 | convert_move (replacements->new, | |
1638 | replacements->old, unsignedp); | |
1639 | seq = gen_sequence (); | |
1640 | end_sequence (); | |
1641 | } | |
1642 | else | |
1643 | seq = gen_move_insn (replacements->new, | |
1644 | replacements->old); | |
1645 | ||
1646 | emit_insn_before (seq, insert_before); | |
6f086dfc RS |
1647 | } |
1648 | ||
1649 | replacements = replacements->next; | |
1650 | } | |
1651 | } | |
1652 | ||
1653 | /* Also fix up any invalid exprs in the REG_NOTES of this insn. | |
1654 | But don't touch other insns referred to by reg-notes; | |
1655 | we will get them elsewhere. */ | |
1656 | for (note = REG_NOTES (insn); note; note = XEXP (note, 1)) | |
1657 | if (GET_CODE (note) != INSN_LIST) | |
ab6155b7 RK |
1658 | XEXP (note, 0) |
1659 | = walk_fixup_memory_subreg (XEXP (note, 0), insn, 1); | |
6f086dfc | 1660 | } |
fe9b4957 MM |
1661 | |
1662 | if (!ht) | |
1663 | insn = next; | |
1664 | else if (insn_list) | |
1665 | { | |
1666 | insn = XEXP (insn_list, 0); | |
1667 | insn_list = XEXP (insn_list, 1); | |
1668 | } | |
1669 | else | |
1670 | insn = NULL_RTX; | |
6f086dfc RS |
1671 | } |
1672 | } | |
1673 | \f | |
00d8a4c1 RK |
1674 | /* VAR is a MEM that used to be a pseudo register with mode PROMOTED_MODE. |
1675 | See if the rtx expression at *LOC in INSN needs to be changed. | |
6f086dfc RS |
1676 | |
1677 | REPLACEMENTS is a pointer to a list head that starts out zero, but may | |
1678 | contain a list of original rtx's and replacements. If we find that we need | |
1679 | to modify this insn by replacing a memory reference with a pseudo or by | |
1680 | making a new MEM to implement a SUBREG, we consult that list to see if | |
1681 | we have already chosen a replacement. If none has already been allocated, | |
1682 | we allocate it and update the list. fixup_var_refs_insns will copy VAR | |
1683 | or the SUBREG, as appropriate, to the pseudo. */ | |
1684 | ||
1685 | static void | |
00d8a4c1 | 1686 | fixup_var_refs_1 (var, promoted_mode, loc, insn, replacements) |
6f086dfc | 1687 | register rtx var; |
00d8a4c1 | 1688 | enum machine_mode promoted_mode; |
6f086dfc RS |
1689 | register rtx *loc; |
1690 | rtx insn; | |
1691 | struct fixup_replacement **replacements; | |
1692 | { | |
1693 | register int i; | |
1694 | register rtx x = *loc; | |
1695 | RTX_CODE code = GET_CODE (x); | |
6f7d635c | 1696 | register const char *fmt; |
6f086dfc RS |
1697 | register rtx tem, tem1; |
1698 | struct fixup_replacement *replacement; | |
1699 | ||
1700 | switch (code) | |
1701 | { | |
e9a25f70 JL |
1702 | case ADDRESSOF: |
1703 | if (XEXP (x, 0) == var) | |
1704 | { | |
956d6950 JL |
1705 | /* Prevent sharing of rtl that might lose. */ |
1706 | rtx sub = copy_rtx (XEXP (var, 0)); | |
1707 | ||
956d6950 JL |
1708 | if (! validate_change (insn, loc, sub, 0)) |
1709 | { | |
5f98f7c4 RH |
1710 | rtx y = gen_reg_rtx (GET_MODE (sub)); |
1711 | rtx seq, new_insn; | |
1712 | ||
1713 | /* We should be able to replace with a register or all is lost. | |
1714 | Note that we can't use validate_change to verify this, since | |
1715 | we're not caring for replacing all dups simultaneously. */ | |
1716 | if (! validate_replace_rtx (*loc, y, insn)) | |
1717 | abort (); | |
1718 | ||
1719 | /* Careful! First try to recognize a direct move of the | |
1720 | value, mimicking how things are done in gen_reload wrt | |
1721 | PLUS. Consider what happens when insn is a conditional | |
1722 | move instruction and addsi3 clobbers flags. */ | |
1723 | ||
1724 | start_sequence (); | |
1725 | new_insn = emit_insn (gen_rtx_SET (VOIDmode, y, sub)); | |
1726 | seq = gen_sequence (); | |
1727 | end_sequence (); | |
1728 | ||
1729 | if (recog_memoized (new_insn) < 0) | |
1730 | { | |
1731 | /* That failed. Fall back on force_operand and hope. */ | |
956d6950 | 1732 | |
5f98f7c4 RH |
1733 | start_sequence (); |
1734 | force_operand (sub, y); | |
1735 | seq = gen_sequence (); | |
1736 | end_sequence (); | |
1737 | } | |
956d6950 | 1738 | |
5f98f7c4 RH |
1739 | #ifdef HAVE_cc0 |
1740 | /* Don't separate setter from user. */ | |
1741 | if (PREV_INSN (insn) && sets_cc0_p (PREV_INSN (insn))) | |
1742 | insn = PREV_INSN (insn); | |
1743 | #endif | |
1744 | ||
1745 | emit_insn_before (seq, insn); | |
1746 | } | |
e9a25f70 JL |
1747 | } |
1748 | return; | |
1749 | ||
6f086dfc RS |
1750 | case MEM: |
1751 | if (var == x) | |
1752 | { | |
1753 | /* If we already have a replacement, use it. Otherwise, | |
1754 | try to fix up this address in case it is invalid. */ | |
1755 | ||
2740a678 | 1756 | replacement = find_fixup_replacement (replacements, var); |
6f086dfc RS |
1757 | if (replacement->new) |
1758 | { | |
1759 | *loc = replacement->new; | |
1760 | return; | |
1761 | } | |
1762 | ||
1763 | *loc = replacement->new = x = fixup_stack_1 (x, insn); | |
1764 | ||
00d8a4c1 RK |
1765 | /* Unless we are forcing memory to register or we changed the mode, |
1766 | we can leave things the way they are if the insn is valid. */ | |
6f086dfc RS |
1767 | |
1768 | INSN_CODE (insn) = -1; | |
00d8a4c1 RK |
1769 | if (! flag_force_mem && GET_MODE (x) == promoted_mode |
1770 | && recog_memoized (insn) >= 0) | |
6f086dfc RS |
1771 | return; |
1772 | ||
00d8a4c1 | 1773 | *loc = replacement->new = gen_reg_rtx (promoted_mode); |
6f086dfc RS |
1774 | return; |
1775 | } | |
1776 | ||
1777 | /* If X contains VAR, we need to unshare it here so that we update | |
1778 | each occurrence separately. But all identical MEMs in one insn | |
1779 | must be replaced with the same rtx because of the possibility of | |
1780 | MATCH_DUPs. */ | |
1781 | ||
1782 | if (reg_mentioned_p (var, x)) | |
1783 | { | |
2740a678 | 1784 | replacement = find_fixup_replacement (replacements, x); |
6f086dfc RS |
1785 | if (replacement->new == 0) |
1786 | replacement->new = copy_most_rtx (x, var); | |
1787 | ||
1788 | *loc = x = replacement->new; | |
1789 | } | |
1790 | break; | |
1791 | ||
1792 | case REG: | |
1793 | case CC0: | |
1794 | case PC: | |
1795 | case CONST_INT: | |
1796 | case CONST: | |
1797 | case SYMBOL_REF: | |
1798 | case LABEL_REF: | |
1799 | case CONST_DOUBLE: | |
1800 | return; | |
1801 | ||
1802 | case SIGN_EXTRACT: | |
1803 | case ZERO_EXTRACT: | |
1804 | /* Note that in some cases those types of expressions are altered | |
1805 | by optimize_bit_field, and do not survive to get here. */ | |
1806 | if (XEXP (x, 0) == var | |
1807 | || (GET_CODE (XEXP (x, 0)) == SUBREG | |
1808 | && SUBREG_REG (XEXP (x, 0)) == var)) | |
1809 | { | |
1810 | /* Get TEM as a valid MEM in the mode presently in the insn. | |
1811 | ||
1812 | We don't worry about the possibility of MATCH_DUP here; it | |
1813 | is highly unlikely and would be tricky to handle. */ | |
1814 | ||
1815 | tem = XEXP (x, 0); | |
1816 | if (GET_CODE (tem) == SUBREG) | |
0e09cc26 RK |
1817 | { |
1818 | if (GET_MODE_BITSIZE (GET_MODE (tem)) | |
1819 | > GET_MODE_BITSIZE (GET_MODE (var))) | |
1820 | { | |
1821 | replacement = find_fixup_replacement (replacements, var); | |
1822 | if (replacement->new == 0) | |
1823 | replacement->new = gen_reg_rtx (GET_MODE (var)); | |
1824 | SUBREG_REG (tem) = replacement->new; | |
1825 | } | |
ef933d26 RK |
1826 | else |
1827 | tem = fixup_memory_subreg (tem, insn, 0); | |
0e09cc26 RK |
1828 | } |
1829 | else | |
1830 | tem = fixup_stack_1 (tem, insn); | |
6f086dfc RS |
1831 | |
1832 | /* Unless we want to load from memory, get TEM into the proper mode | |
1833 | for an extract from memory. This can only be done if the | |
1834 | extract is at a constant position and length. */ | |
1835 | ||
1836 | if (! flag_force_mem && GET_CODE (XEXP (x, 1)) == CONST_INT | |
1837 | && GET_CODE (XEXP (x, 2)) == CONST_INT | |
1838 | && ! mode_dependent_address_p (XEXP (tem, 0)) | |
1839 | && ! MEM_VOLATILE_P (tem)) | |
1840 | { | |
1841 | enum machine_mode wanted_mode = VOIDmode; | |
1842 | enum machine_mode is_mode = GET_MODE (tem); | |
e5e809f4 | 1843 | HOST_WIDE_INT pos = INTVAL (XEXP (x, 2)); |
6f086dfc RS |
1844 | |
1845 | #ifdef HAVE_extzv | |
1846 | if (GET_CODE (x) == ZERO_EXTRACT) | |
0d8e55d8 JL |
1847 | { |
1848 | wanted_mode = insn_operand_mode[(int) CODE_FOR_extzv][1]; | |
1849 | if (wanted_mode == VOIDmode) | |
1850 | wanted_mode = word_mode; | |
1851 | } | |
6f086dfc RS |
1852 | #endif |
1853 | #ifdef HAVE_extv | |
1854 | if (GET_CODE (x) == SIGN_EXTRACT) | |
0d8e55d8 JL |
1855 | { |
1856 | wanted_mode = insn_operand_mode[(int) CODE_FOR_extv][1]; | |
1857 | if (wanted_mode == VOIDmode) | |
1858 | wanted_mode = word_mode; | |
1859 | } | |
6f086dfc | 1860 | #endif |
6dc42e49 | 1861 | /* If we have a narrower mode, we can do something. */ |
6f086dfc RS |
1862 | if (wanted_mode != VOIDmode |
1863 | && GET_MODE_SIZE (wanted_mode) < GET_MODE_SIZE (is_mode)) | |
1864 | { | |
e5e809f4 | 1865 | HOST_WIDE_INT offset = pos / BITS_PER_UNIT; |
6f086dfc RS |
1866 | rtx old_pos = XEXP (x, 2); |
1867 | rtx newmem; | |
1868 | ||
1869 | /* If the bytes and bits are counted differently, we | |
1870 | must adjust the offset. */ | |
f76b9db2 ILT |
1871 | if (BYTES_BIG_ENDIAN != BITS_BIG_ENDIAN) |
1872 | offset = (GET_MODE_SIZE (is_mode) | |
1873 | - GET_MODE_SIZE (wanted_mode) - offset); | |
6f086dfc RS |
1874 | |
1875 | pos %= GET_MODE_BITSIZE (wanted_mode); | |
1876 | ||
38a448ca RH |
1877 | newmem = gen_rtx_MEM (wanted_mode, |
1878 | plus_constant (XEXP (tem, 0), offset)); | |
6f086dfc | 1879 | RTX_UNCHANGING_P (newmem) = RTX_UNCHANGING_P (tem); |
c6df88cb | 1880 | MEM_COPY_ATTRIBUTES (newmem, tem); |
6f086dfc RS |
1881 | |
1882 | /* Make the change and see if the insn remains valid. */ | |
1883 | INSN_CODE (insn) = -1; | |
1884 | XEXP (x, 0) = newmem; | |
5f4f0e22 | 1885 | XEXP (x, 2) = GEN_INT (pos); |
6f086dfc RS |
1886 | |
1887 | if (recog_memoized (insn) >= 0) | |
1888 | return; | |
1889 | ||
1890 | /* Otherwise, restore old position. XEXP (x, 0) will be | |
1891 | restored later. */ | |
1892 | XEXP (x, 2) = old_pos; | |
1893 | } | |
1894 | } | |
1895 | ||
1896 | /* If we get here, the bitfield extract insn can't accept a memory | |
1897 | reference. Copy the input into a register. */ | |
1898 | ||
1899 | tem1 = gen_reg_rtx (GET_MODE (tem)); | |
1900 | emit_insn_before (gen_move_insn (tem1, tem), insn); | |
1901 | XEXP (x, 0) = tem1; | |
1902 | return; | |
1903 | } | |
1904 | break; | |
1905 | ||
1906 | case SUBREG: | |
1907 | if (SUBREG_REG (x) == var) | |
1908 | { | |
00d8a4c1 RK |
1909 | /* If this is a special SUBREG made because VAR was promoted |
1910 | from a wider mode, replace it with VAR and call ourself | |
1911 | recursively, this time saying that the object previously | |
1912 | had its current mode (by virtue of the SUBREG). */ | |
1913 | ||
1914 | if (SUBREG_PROMOTED_VAR_P (x)) | |
1915 | { | |
1916 | *loc = var; | |
1917 | fixup_var_refs_1 (var, GET_MODE (var), loc, insn, replacements); | |
1918 | return; | |
1919 | } | |
1920 | ||
6f086dfc RS |
1921 | /* If this SUBREG makes VAR wider, it has become a paradoxical |
1922 | SUBREG with VAR in memory, but these aren't allowed at this | |
1923 | stage of the compilation. So load VAR into a pseudo and take | |
1924 | a SUBREG of that pseudo. */ | |
1925 | if (GET_MODE_SIZE (GET_MODE (x)) > GET_MODE_SIZE (GET_MODE (var))) | |
1926 | { | |
2740a678 | 1927 | replacement = find_fixup_replacement (replacements, var); |
6f086dfc RS |
1928 | if (replacement->new == 0) |
1929 | replacement->new = gen_reg_rtx (GET_MODE (var)); | |
1930 | SUBREG_REG (x) = replacement->new; | |
1931 | return; | |
1932 | } | |
1933 | ||
1934 | /* See if we have already found a replacement for this SUBREG. | |
1935 | If so, use it. Otherwise, make a MEM and see if the insn | |
1936 | is recognized. If not, or if we should force MEM into a register, | |
1937 | make a pseudo for this SUBREG. */ | |
2740a678 | 1938 | replacement = find_fixup_replacement (replacements, x); |
6f086dfc RS |
1939 | if (replacement->new) |
1940 | { | |
1941 | *loc = replacement->new; | |
1942 | return; | |
1943 | } | |
1944 | ||
1945 | replacement->new = *loc = fixup_memory_subreg (x, insn, 0); | |
1946 | ||
f898f031 | 1947 | INSN_CODE (insn) = -1; |
6f086dfc RS |
1948 | if (! flag_force_mem && recog_memoized (insn) >= 0) |
1949 | return; | |
1950 | ||
1951 | *loc = replacement->new = gen_reg_rtx (GET_MODE (x)); | |
1952 | return; | |
1953 | } | |
1954 | break; | |
1955 | ||
1956 | case SET: | |
1957 | /* First do special simplification of bit-field references. */ | |
1958 | if (GET_CODE (SET_DEST (x)) == SIGN_EXTRACT | |
1959 | || GET_CODE (SET_DEST (x)) == ZERO_EXTRACT) | |
1960 | optimize_bit_field (x, insn, 0); | |
1961 | if (GET_CODE (SET_SRC (x)) == SIGN_EXTRACT | |
1962 | || GET_CODE (SET_SRC (x)) == ZERO_EXTRACT) | |
5f4f0e22 | 1963 | optimize_bit_field (x, insn, NULL_PTR); |
6f086dfc | 1964 | |
0e09cc26 RK |
1965 | /* For a paradoxical SUBREG inside a ZERO_EXTRACT, load the object |
1966 | into a register and then store it back out. */ | |
1967 | if (GET_CODE (SET_DEST (x)) == ZERO_EXTRACT | |
1968 | && GET_CODE (XEXP (SET_DEST (x), 0)) == SUBREG | |
1969 | && SUBREG_REG (XEXP (SET_DEST (x), 0)) == var | |
1970 | && (GET_MODE_SIZE (GET_MODE (XEXP (SET_DEST (x), 0))) | |
1971 | > GET_MODE_SIZE (GET_MODE (var)))) | |
1972 | { | |
1973 | replacement = find_fixup_replacement (replacements, var); | |
1974 | if (replacement->new == 0) | |
1975 | replacement->new = gen_reg_rtx (GET_MODE (var)); | |
1976 | ||
1977 | SUBREG_REG (XEXP (SET_DEST (x), 0)) = replacement->new; | |
1978 | emit_insn_after (gen_move_insn (var, replacement->new), insn); | |
1979 | } | |
1980 | ||
6f086dfc | 1981 | /* If SET_DEST is now a paradoxical SUBREG, put the result of this |
0f41302f | 1982 | insn into a pseudo and store the low part of the pseudo into VAR. */ |
6f086dfc RS |
1983 | if (GET_CODE (SET_DEST (x)) == SUBREG |
1984 | && SUBREG_REG (SET_DEST (x)) == var | |
1985 | && (GET_MODE_SIZE (GET_MODE (SET_DEST (x))) | |
1986 | > GET_MODE_SIZE (GET_MODE (var)))) | |
1987 | { | |
1988 | SET_DEST (x) = tem = gen_reg_rtx (GET_MODE (SET_DEST (x))); | |
1989 | emit_insn_after (gen_move_insn (var, gen_lowpart (GET_MODE (var), | |
1990 | tem)), | |
1991 | insn); | |
1992 | break; | |
1993 | } | |
1994 | ||
1995 | { | |
1996 | rtx dest = SET_DEST (x); | |
1997 | rtx src = SET_SRC (x); | |
29a82058 | 1998 | #ifdef HAVE_insv |
6f086dfc | 1999 | rtx outerdest = dest; |
29a82058 | 2000 | #endif |
6f086dfc RS |
2001 | |
2002 | while (GET_CODE (dest) == SUBREG || GET_CODE (dest) == STRICT_LOW_PART | |
2003 | || GET_CODE (dest) == SIGN_EXTRACT | |
2004 | || GET_CODE (dest) == ZERO_EXTRACT) | |
2005 | dest = XEXP (dest, 0); | |
2006 | ||
2007 | if (GET_CODE (src) == SUBREG) | |
2008 | src = XEXP (src, 0); | |
2009 | ||
2010 | /* If VAR does not appear at the top level of the SET | |
2011 | just scan the lower levels of the tree. */ | |
2012 | ||
2013 | if (src != var && dest != var) | |
2014 | break; | |
2015 | ||
2016 | /* We will need to rerecognize this insn. */ | |
2017 | INSN_CODE (insn) = -1; | |
2018 | ||
2019 | #ifdef HAVE_insv | |
2020 | if (GET_CODE (outerdest) == ZERO_EXTRACT && dest == var) | |
2021 | { | |
2022 | /* Since this case will return, ensure we fixup all the | |
2023 | operands here. */ | |
00d8a4c1 RK |
2024 | fixup_var_refs_1 (var, promoted_mode, &XEXP (outerdest, 1), |
2025 | insn, replacements); | |
2026 | fixup_var_refs_1 (var, promoted_mode, &XEXP (outerdest, 2), | |
2027 | insn, replacements); | |
2028 | fixup_var_refs_1 (var, promoted_mode, &SET_SRC (x), | |
2029 | insn, replacements); | |
6f086dfc RS |
2030 | |
2031 | tem = XEXP (outerdest, 0); | |
2032 | ||
2033 | /* Clean up (SUBREG:SI (MEM:mode ...) 0) | |
2034 | that may appear inside a ZERO_EXTRACT. | |
2035 | This was legitimate when the MEM was a REG. */ | |
2036 | if (GET_CODE (tem) == SUBREG | |
2037 | && SUBREG_REG (tem) == var) | |
0e09cc26 | 2038 | tem = fixup_memory_subreg (tem, insn, 0); |
6f086dfc RS |
2039 | else |
2040 | tem = fixup_stack_1 (tem, insn); | |
2041 | ||
2042 | if (GET_CODE (XEXP (outerdest, 1)) == CONST_INT | |
2043 | && GET_CODE (XEXP (outerdest, 2)) == CONST_INT | |
2044 | && ! mode_dependent_address_p (XEXP (tem, 0)) | |
2045 | && ! MEM_VOLATILE_P (tem)) | |
2046 | { | |
0d8e55d8 | 2047 | enum machine_mode wanted_mode; |
6f086dfc | 2048 | enum machine_mode is_mode = GET_MODE (tem); |
e5e809f4 | 2049 | HOST_WIDE_INT pos = INTVAL (XEXP (outerdest, 2)); |
6f086dfc | 2050 | |
0d8e55d8 JL |
2051 | wanted_mode = insn_operand_mode[(int) CODE_FOR_insv][0]; |
2052 | if (wanted_mode == VOIDmode) | |
2053 | wanted_mode = word_mode; | |
2054 | ||
6dc42e49 | 2055 | /* If we have a narrower mode, we can do something. */ |
6f086dfc RS |
2056 | if (GET_MODE_SIZE (wanted_mode) < GET_MODE_SIZE (is_mode)) |
2057 | { | |
e5e809f4 | 2058 | HOST_WIDE_INT offset = pos / BITS_PER_UNIT; |
6f086dfc RS |
2059 | rtx old_pos = XEXP (outerdest, 2); |
2060 | rtx newmem; | |
2061 | ||
f76b9db2 ILT |
2062 | if (BYTES_BIG_ENDIAN != BITS_BIG_ENDIAN) |
2063 | offset = (GET_MODE_SIZE (is_mode) | |
2064 | - GET_MODE_SIZE (wanted_mode) - offset); | |
6f086dfc RS |
2065 | |
2066 | pos %= GET_MODE_BITSIZE (wanted_mode); | |
2067 | ||
38a448ca RH |
2068 | newmem = gen_rtx_MEM (wanted_mode, |
2069 | plus_constant (XEXP (tem, 0), offset)); | |
6f086dfc | 2070 | RTX_UNCHANGING_P (newmem) = RTX_UNCHANGING_P (tem); |
c6df88cb | 2071 | MEM_COPY_ATTRIBUTES (newmem, tem); |
6f086dfc RS |
2072 | |
2073 | /* Make the change and see if the insn remains valid. */ | |
2074 | INSN_CODE (insn) = -1; | |
2075 | XEXP (outerdest, 0) = newmem; | |
5f4f0e22 | 2076 | XEXP (outerdest, 2) = GEN_INT (pos); |
6f086dfc RS |
2077 | |
2078 | if (recog_memoized (insn) >= 0) | |
2079 | return; | |
2080 | ||
2081 | /* Otherwise, restore old position. XEXP (x, 0) will be | |
2082 | restored later. */ | |
2083 | XEXP (outerdest, 2) = old_pos; | |
2084 | } | |
2085 | } | |
2086 | ||
2087 | /* If we get here, the bit-field store doesn't allow memory | |
2088 | or isn't located at a constant position. Load the value into | |
2089 | a register, do the store, and put it back into memory. */ | |
2090 | ||
2091 | tem1 = gen_reg_rtx (GET_MODE (tem)); | |
2092 | emit_insn_before (gen_move_insn (tem1, tem), insn); | |
2093 | emit_insn_after (gen_move_insn (tem, tem1), insn); | |
2094 | XEXP (outerdest, 0) = tem1; | |
2095 | return; | |
2096 | } | |
2097 | #endif | |
2098 | ||
2099 | /* STRICT_LOW_PART is a no-op on memory references | |
2100 | and it can cause combinations to be unrecognizable, | |
2101 | so eliminate it. */ | |
2102 | ||
2103 | if (dest == var && GET_CODE (SET_DEST (x)) == STRICT_LOW_PART) | |
2104 | SET_DEST (x) = XEXP (SET_DEST (x), 0); | |
2105 | ||
2106 | /* A valid insn to copy VAR into or out of a register | |
2107 | must be left alone, to avoid an infinite loop here. | |
2108 | If the reference to VAR is by a subreg, fix that up, | |
2109 | since SUBREG is not valid for a memref. | |
e15762df RK |
2110 | Also fix up the address of the stack slot. |
2111 | ||
2112 | Note that we must not try to recognize the insn until | |
2113 | after we know that we have valid addresses and no | |
2114 | (subreg (mem ...) ...) constructs, since these interfere | |
2115 | with determining the validity of the insn. */ | |
6f086dfc RS |
2116 | |
2117 | if ((SET_SRC (x) == var | |
2118 | || (GET_CODE (SET_SRC (x)) == SUBREG | |
2119 | && SUBREG_REG (SET_SRC (x)) == var)) | |
2120 | && (GET_CODE (SET_DEST (x)) == REG | |
2121 | || (GET_CODE (SET_DEST (x)) == SUBREG | |
2122 | && GET_CODE (SUBREG_REG (SET_DEST (x))) == REG)) | |
1d273bf5 | 2123 | && GET_MODE (var) == promoted_mode |
c46722a7 | 2124 | && x == single_set (insn)) |
6f086dfc | 2125 | { |
e15762df RK |
2126 | rtx pat; |
2127 | ||
2740a678 | 2128 | replacement = find_fixup_replacement (replacements, SET_SRC (x)); |
6f086dfc | 2129 | if (replacement->new) |
6f086dfc | 2130 | SET_SRC (x) = replacement->new; |
6f086dfc RS |
2131 | else if (GET_CODE (SET_SRC (x)) == SUBREG) |
2132 | SET_SRC (x) = replacement->new | |
2133 | = fixup_memory_subreg (SET_SRC (x), insn, 0); | |
2134 | else | |
2135 | SET_SRC (x) = replacement->new | |
2136 | = fixup_stack_1 (SET_SRC (x), insn); | |
e15762df RK |
2137 | |
2138 | if (recog_memoized (insn) >= 0) | |
2139 | return; | |
2140 | ||
2141 | /* INSN is not valid, but we know that we want to | |
2142 | copy SET_SRC (x) to SET_DEST (x) in some way. So | |
2143 | we generate the move and see whether it requires more | |
2144 | than one insn. If it does, we emit those insns and | |
2145 | delete INSN. Otherwise, we an just replace the pattern | |
2146 | of INSN; we have already verified above that INSN has | |
2147 | no other function that to do X. */ | |
2148 | ||
2149 | pat = gen_move_insn (SET_DEST (x), SET_SRC (x)); | |
2150 | if (GET_CODE (pat) == SEQUENCE) | |
2151 | { | |
2152 | emit_insn_after (pat, insn); | |
2153 | PUT_CODE (insn, NOTE); | |
2154 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
2155 | NOTE_SOURCE_FILE (insn) = 0; | |
2156 | } | |
2157 | else | |
2158 | PATTERN (insn) = pat; | |
2159 | ||
6f086dfc RS |
2160 | return; |
2161 | } | |
2162 | ||
2163 | if ((SET_DEST (x) == var | |
2164 | || (GET_CODE (SET_DEST (x)) == SUBREG | |
2165 | && SUBREG_REG (SET_DEST (x)) == var)) | |
2166 | && (GET_CODE (SET_SRC (x)) == REG | |
2167 | || (GET_CODE (SET_SRC (x)) == SUBREG | |
2168 | && GET_CODE (SUBREG_REG (SET_SRC (x))) == REG)) | |
1d273bf5 | 2169 | && GET_MODE (var) == promoted_mode |
c46722a7 | 2170 | && x == single_set (insn)) |
6f086dfc | 2171 | { |
e15762df RK |
2172 | rtx pat; |
2173 | ||
6f086dfc RS |
2174 | if (GET_CODE (SET_DEST (x)) == SUBREG) |
2175 | SET_DEST (x) = fixup_memory_subreg (SET_DEST (x), insn, 0); | |
2176 | else | |
2177 | SET_DEST (x) = fixup_stack_1 (SET_DEST (x), insn); | |
e15762df RK |
2178 | |
2179 | if (recog_memoized (insn) >= 0) | |
2180 | return; | |
2181 | ||
2182 | pat = gen_move_insn (SET_DEST (x), SET_SRC (x)); | |
2183 | if (GET_CODE (pat) == SEQUENCE) | |
2184 | { | |
2185 | emit_insn_after (pat, insn); | |
2186 | PUT_CODE (insn, NOTE); | |
2187 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
2188 | NOTE_SOURCE_FILE (insn) = 0; | |
2189 | } | |
2190 | else | |
2191 | PATTERN (insn) = pat; | |
2192 | ||
6f086dfc RS |
2193 | return; |
2194 | } | |
2195 | ||
2196 | /* Otherwise, storing into VAR must be handled specially | |
2197 | by storing into a temporary and copying that into VAR | |
00d8a4c1 RK |
2198 | with a new insn after this one. Note that this case |
2199 | will be used when storing into a promoted scalar since | |
2200 | the insn will now have different modes on the input | |
2201 | and output and hence will be invalid (except for the case | |
2202 | of setting it to a constant, which does not need any | |
2203 | change if it is valid). We generate extra code in that case, | |
2204 | but combine.c will eliminate it. */ | |
6f086dfc RS |
2205 | |
2206 | if (dest == var) | |
2207 | { | |
2208 | rtx temp; | |
00d8a4c1 RK |
2209 | rtx fixeddest = SET_DEST (x); |
2210 | ||
6f086dfc | 2211 | /* STRICT_LOW_PART can be discarded, around a MEM. */ |
00d8a4c1 RK |
2212 | if (GET_CODE (fixeddest) == STRICT_LOW_PART) |
2213 | fixeddest = XEXP (fixeddest, 0); | |
6f086dfc | 2214 | /* Convert (SUBREG (MEM)) to a MEM in a changed mode. */ |
00d8a4c1 | 2215 | if (GET_CODE (fixeddest) == SUBREG) |
926d1ca5 RK |
2216 | { |
2217 | fixeddest = fixup_memory_subreg (fixeddest, insn, 0); | |
2218 | promoted_mode = GET_MODE (fixeddest); | |
2219 | } | |
6f086dfc | 2220 | else |
00d8a4c1 RK |
2221 | fixeddest = fixup_stack_1 (fixeddest, insn); |
2222 | ||
926d1ca5 | 2223 | temp = gen_reg_rtx (promoted_mode); |
00d8a4c1 RK |
2224 | |
2225 | emit_insn_after (gen_move_insn (fixeddest, | |
2226 | gen_lowpart (GET_MODE (fixeddest), | |
2227 | temp)), | |
2228 | insn); | |
6f086dfc | 2229 | |
6f086dfc RS |
2230 | SET_DEST (x) = temp; |
2231 | } | |
2232 | } | |
e9a25f70 JL |
2233 | |
2234 | default: | |
2235 | break; | |
6f086dfc RS |
2236 | } |
2237 | ||
2238 | /* Nothing special about this RTX; fix its operands. */ | |
2239 | ||
2240 | fmt = GET_RTX_FORMAT (code); | |
2241 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2242 | { | |
2243 | if (fmt[i] == 'e') | |
00d8a4c1 | 2244 | fixup_var_refs_1 (var, promoted_mode, &XEXP (x, i), insn, replacements); |
6f086dfc RS |
2245 | if (fmt[i] == 'E') |
2246 | { | |
2247 | register int j; | |
2248 | for (j = 0; j < XVECLEN (x, i); j++) | |
00d8a4c1 RK |
2249 | fixup_var_refs_1 (var, promoted_mode, &XVECEXP (x, i, j), |
2250 | insn, replacements); | |
6f086dfc RS |
2251 | } |
2252 | } | |
2253 | } | |
2254 | \f | |
2255 | /* Given X, an rtx of the form (SUBREG:m1 (MEM:m2 addr)), | |
2256 | return an rtx (MEM:m1 newaddr) which is equivalent. | |
2257 | If any insns must be emitted to compute NEWADDR, put them before INSN. | |
2258 | ||
2259 | UNCRITICAL nonzero means accept paradoxical subregs. | |
0f41302f | 2260 | This is used for subregs found inside REG_NOTES. */ |
6f086dfc RS |
2261 | |
2262 | static rtx | |
2263 | fixup_memory_subreg (x, insn, uncritical) | |
2264 | rtx x; | |
2265 | rtx insn; | |
2266 | int uncritical; | |
2267 | { | |
2268 | int offset = SUBREG_WORD (x) * UNITS_PER_WORD; | |
2269 | rtx addr = XEXP (SUBREG_REG (x), 0); | |
2270 | enum machine_mode mode = GET_MODE (x); | |
29a82058 | 2271 | rtx result; |
6f086dfc RS |
2272 | |
2273 | /* Paradoxical SUBREGs are usually invalid during RTL generation. */ | |
2274 | if (GET_MODE_SIZE (mode) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) | |
2275 | && ! uncritical) | |
2276 | abort (); | |
2277 | ||
f76b9db2 ILT |
2278 | if (BYTES_BIG_ENDIAN) |
2279 | offset += (MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) | |
2280 | - MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))); | |
6f086dfc RS |
2281 | addr = plus_constant (addr, offset); |
2282 | if (!flag_force_addr && memory_address_p (mode, addr)) | |
2283 | /* Shortcut if no insns need be emitted. */ | |
2284 | return change_address (SUBREG_REG (x), mode, addr); | |
2285 | start_sequence (); | |
2286 | result = change_address (SUBREG_REG (x), mode, addr); | |
2287 | emit_insn_before (gen_sequence (), insn); | |
2288 | end_sequence (); | |
2289 | return result; | |
2290 | } | |
2291 | ||
2292 | /* Do fixup_memory_subreg on all (SUBREG (MEM ...) ...) contained in X. | |
2293 | Replace subexpressions of X in place. | |
2294 | If X itself is a (SUBREG (MEM ...) ...), return the replacement expression. | |
2295 | Otherwise return X, with its contents possibly altered. | |
2296 | ||
ab6155b7 RK |
2297 | If any insns must be emitted to compute NEWADDR, put them before INSN. |
2298 | ||
2299 | UNCRITICAL is as in fixup_memory_subreg. */ | |
6f086dfc RS |
2300 | |
2301 | static rtx | |
ab6155b7 | 2302 | walk_fixup_memory_subreg (x, insn, uncritical) |
6f086dfc RS |
2303 | register rtx x; |
2304 | rtx insn; | |
ab6155b7 | 2305 | int uncritical; |
6f086dfc RS |
2306 | { |
2307 | register enum rtx_code code; | |
6f7d635c | 2308 | register const char *fmt; |
6f086dfc RS |
2309 | register int i; |
2310 | ||
2311 | if (x == 0) | |
2312 | return 0; | |
2313 | ||
2314 | code = GET_CODE (x); | |
2315 | ||
2316 | if (code == SUBREG && GET_CODE (SUBREG_REG (x)) == MEM) | |
ab6155b7 | 2317 | return fixup_memory_subreg (x, insn, uncritical); |
6f086dfc RS |
2318 | |
2319 | /* Nothing special about this RTX; fix its operands. */ | |
2320 | ||
2321 | fmt = GET_RTX_FORMAT (code); | |
2322 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2323 | { | |
2324 | if (fmt[i] == 'e') | |
ab6155b7 | 2325 | XEXP (x, i) = walk_fixup_memory_subreg (XEXP (x, i), insn, uncritical); |
6f086dfc RS |
2326 | if (fmt[i] == 'E') |
2327 | { | |
2328 | register int j; | |
2329 | for (j = 0; j < XVECLEN (x, i); j++) | |
2330 | XVECEXP (x, i, j) | |
ab6155b7 | 2331 | = walk_fixup_memory_subreg (XVECEXP (x, i, j), insn, uncritical); |
6f086dfc RS |
2332 | } |
2333 | } | |
2334 | return x; | |
2335 | } | |
2336 | \f | |
6f086dfc RS |
2337 | /* For each memory ref within X, if it refers to a stack slot |
2338 | with an out of range displacement, put the address in a temp register | |
2339 | (emitting new insns before INSN to load these registers) | |
2340 | and alter the memory ref to use that register. | |
2341 | Replace each such MEM rtx with a copy, to avoid clobberage. */ | |
2342 | ||
2343 | static rtx | |
2344 | fixup_stack_1 (x, insn) | |
2345 | rtx x; | |
2346 | rtx insn; | |
2347 | { | |
2348 | register int i; | |
2349 | register RTX_CODE code = GET_CODE (x); | |
6f7d635c | 2350 | register const char *fmt; |
6f086dfc RS |
2351 | |
2352 | if (code == MEM) | |
2353 | { | |
2354 | register rtx ad = XEXP (x, 0); | |
2355 | /* If we have address of a stack slot but it's not valid | |
2356 | (displacement is too large), compute the sum in a register. */ | |
2357 | if (GET_CODE (ad) == PLUS | |
2358 | && GET_CODE (XEXP (ad, 0)) == REG | |
40d05551 RK |
2359 | && ((REGNO (XEXP (ad, 0)) >= FIRST_VIRTUAL_REGISTER |
2360 | && REGNO (XEXP (ad, 0)) <= LAST_VIRTUAL_REGISTER) | |
e9a25f70 JL |
2361 | || REGNO (XEXP (ad, 0)) == FRAME_POINTER_REGNUM |
2362 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
2363 | || REGNO (XEXP (ad, 0)) == HARD_FRAME_POINTER_REGNUM | |
2364 | #endif | |
2365 | || REGNO (XEXP (ad, 0)) == STACK_POINTER_REGNUM | |
956d6950 | 2366 | || REGNO (XEXP (ad, 0)) == ARG_POINTER_REGNUM |
40d05551 | 2367 | || XEXP (ad, 0) == current_function_internal_arg_pointer) |
6f086dfc RS |
2368 | && GET_CODE (XEXP (ad, 1)) == CONST_INT) |
2369 | { | |
2370 | rtx temp, seq; | |
2371 | if (memory_address_p (GET_MODE (x), ad)) | |
2372 | return x; | |
2373 | ||
2374 | start_sequence (); | |
2375 | temp = copy_to_reg (ad); | |
2376 | seq = gen_sequence (); | |
2377 | end_sequence (); | |
2378 | emit_insn_before (seq, insn); | |
2379 | return change_address (x, VOIDmode, temp); | |
2380 | } | |
2381 | return x; | |
2382 | } | |
2383 | ||
2384 | fmt = GET_RTX_FORMAT (code); | |
2385 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2386 | { | |
2387 | if (fmt[i] == 'e') | |
2388 | XEXP (x, i) = fixup_stack_1 (XEXP (x, i), insn); | |
2389 | if (fmt[i] == 'E') | |
2390 | { | |
2391 | register int j; | |
2392 | for (j = 0; j < XVECLEN (x, i); j++) | |
2393 | XVECEXP (x, i, j) = fixup_stack_1 (XVECEXP (x, i, j), insn); | |
2394 | } | |
2395 | } | |
2396 | return x; | |
2397 | } | |
2398 | \f | |
2399 | /* Optimization: a bit-field instruction whose field | |
2400 | happens to be a byte or halfword in memory | |
2401 | can be changed to a move instruction. | |
2402 | ||
2403 | We call here when INSN is an insn to examine or store into a bit-field. | |
2404 | BODY is the SET-rtx to be altered. | |
2405 | ||
2406 | EQUIV_MEM is the table `reg_equiv_mem' if that is available; else 0. | |
2407 | (Currently this is called only from function.c, and EQUIV_MEM | |
2408 | is always 0.) */ | |
2409 | ||
2410 | static void | |
2411 | optimize_bit_field (body, insn, equiv_mem) | |
2412 | rtx body; | |
2413 | rtx insn; | |
2414 | rtx *equiv_mem; | |
2415 | { | |
2416 | register rtx bitfield; | |
2417 | int destflag; | |
2418 | rtx seq = 0; | |
2419 | enum machine_mode mode; | |
2420 | ||
2421 | if (GET_CODE (SET_DEST (body)) == SIGN_EXTRACT | |
2422 | || GET_CODE (SET_DEST (body)) == ZERO_EXTRACT) | |
2423 | bitfield = SET_DEST (body), destflag = 1; | |
2424 | else | |
2425 | bitfield = SET_SRC (body), destflag = 0; | |
2426 | ||
2427 | /* First check that the field being stored has constant size and position | |
2428 | and is in fact a byte or halfword suitably aligned. */ | |
2429 | ||
2430 | if (GET_CODE (XEXP (bitfield, 1)) == CONST_INT | |
2431 | && GET_CODE (XEXP (bitfield, 2)) == CONST_INT | |
2432 | && ((mode = mode_for_size (INTVAL (XEXP (bitfield, 1)), MODE_INT, 1)) | |
2433 | != BLKmode) | |
2434 | && INTVAL (XEXP (bitfield, 2)) % INTVAL (XEXP (bitfield, 1)) == 0) | |
2435 | { | |
2436 | register rtx memref = 0; | |
2437 | ||
2438 | /* Now check that the containing word is memory, not a register, | |
2439 | and that it is safe to change the machine mode. */ | |
2440 | ||
2441 | if (GET_CODE (XEXP (bitfield, 0)) == MEM) | |
2442 | memref = XEXP (bitfield, 0); | |
2443 | else if (GET_CODE (XEXP (bitfield, 0)) == REG | |
2444 | && equiv_mem != 0) | |
2445 | memref = equiv_mem[REGNO (XEXP (bitfield, 0))]; | |
2446 | else if (GET_CODE (XEXP (bitfield, 0)) == SUBREG | |
2447 | && GET_CODE (SUBREG_REG (XEXP (bitfield, 0))) == MEM) | |
2448 | memref = SUBREG_REG (XEXP (bitfield, 0)); | |
2449 | else if (GET_CODE (XEXP (bitfield, 0)) == SUBREG | |
2450 | && equiv_mem != 0 | |
2451 | && GET_CODE (SUBREG_REG (XEXP (bitfield, 0))) == REG) | |
2452 | memref = equiv_mem[REGNO (SUBREG_REG (XEXP (bitfield, 0)))]; | |
2453 | ||
2454 | if (memref | |
2455 | && ! mode_dependent_address_p (XEXP (memref, 0)) | |
2456 | && ! MEM_VOLATILE_P (memref)) | |
2457 | { | |
2458 | /* Now adjust the address, first for any subreg'ing | |
2459 | that we are now getting rid of, | |
2460 | and then for which byte of the word is wanted. */ | |
2461 | ||
e5e809f4 | 2462 | HOST_WIDE_INT offset = INTVAL (XEXP (bitfield, 2)); |
b88a3142 RK |
2463 | rtx insns; |
2464 | ||
6f086dfc | 2465 | /* Adjust OFFSET to count bits from low-address byte. */ |
f76b9db2 ILT |
2466 | if (BITS_BIG_ENDIAN != BYTES_BIG_ENDIAN) |
2467 | offset = (GET_MODE_BITSIZE (GET_MODE (XEXP (bitfield, 0))) | |
2468 | - offset - INTVAL (XEXP (bitfield, 1))); | |
2469 | ||
6f086dfc RS |
2470 | /* Adjust OFFSET to count bytes from low-address byte. */ |
2471 | offset /= BITS_PER_UNIT; | |
2472 | if (GET_CODE (XEXP (bitfield, 0)) == SUBREG) | |
2473 | { | |
2474 | offset += SUBREG_WORD (XEXP (bitfield, 0)) * UNITS_PER_WORD; | |
f76b9db2 ILT |
2475 | if (BYTES_BIG_ENDIAN) |
2476 | offset -= (MIN (UNITS_PER_WORD, | |
2477 | GET_MODE_SIZE (GET_MODE (XEXP (bitfield, 0)))) | |
2478 | - MIN (UNITS_PER_WORD, | |
2479 | GET_MODE_SIZE (GET_MODE (memref)))); | |
6f086dfc RS |
2480 | } |
2481 | ||
b88a3142 RK |
2482 | start_sequence (); |
2483 | memref = change_address (memref, mode, | |
6f086dfc | 2484 | plus_constant (XEXP (memref, 0), offset)); |
b88a3142 RK |
2485 | insns = get_insns (); |
2486 | end_sequence (); | |
2487 | emit_insns_before (insns, insn); | |
6f086dfc RS |
2488 | |
2489 | /* Store this memory reference where | |
2490 | we found the bit field reference. */ | |
2491 | ||
2492 | if (destflag) | |
2493 | { | |
2494 | validate_change (insn, &SET_DEST (body), memref, 1); | |
2495 | if (! CONSTANT_ADDRESS_P (SET_SRC (body))) | |
2496 | { | |
2497 | rtx src = SET_SRC (body); | |
2498 | while (GET_CODE (src) == SUBREG | |
2499 | && SUBREG_WORD (src) == 0) | |
2500 | src = SUBREG_REG (src); | |
2501 | if (GET_MODE (src) != GET_MODE (memref)) | |
2502 | src = gen_lowpart (GET_MODE (memref), SET_SRC (body)); | |
2503 | validate_change (insn, &SET_SRC (body), src, 1); | |
2504 | } | |
2505 | else if (GET_MODE (SET_SRC (body)) != VOIDmode | |
2506 | && GET_MODE (SET_SRC (body)) != GET_MODE (memref)) | |
2507 | /* This shouldn't happen because anything that didn't have | |
2508 | one of these modes should have got converted explicitly | |
2509 | and then referenced through a subreg. | |
2510 | This is so because the original bit-field was | |
2511 | handled by agg_mode and so its tree structure had | |
2512 | the same mode that memref now has. */ | |
2513 | abort (); | |
2514 | } | |
2515 | else | |
2516 | { | |
2517 | rtx dest = SET_DEST (body); | |
2518 | ||
2519 | while (GET_CODE (dest) == SUBREG | |
4013a709 RK |
2520 | && SUBREG_WORD (dest) == 0 |
2521 | && (GET_MODE_CLASS (GET_MODE (dest)) | |
ab87f8c8 JL |
2522 | == GET_MODE_CLASS (GET_MODE (SUBREG_REG (dest)))) |
2523 | && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (dest))) | |
2524 | <= UNITS_PER_WORD)) | |
6f086dfc RS |
2525 | dest = SUBREG_REG (dest); |
2526 | ||
2527 | validate_change (insn, &SET_DEST (body), dest, 1); | |
2528 | ||
2529 | if (GET_MODE (dest) == GET_MODE (memref)) | |
2530 | validate_change (insn, &SET_SRC (body), memref, 1); | |
2531 | else | |
2532 | { | |
2533 | /* Convert the mem ref to the destination mode. */ | |
2534 | rtx newreg = gen_reg_rtx (GET_MODE (dest)); | |
2535 | ||
2536 | start_sequence (); | |
2537 | convert_move (newreg, memref, | |
2538 | GET_CODE (SET_SRC (body)) == ZERO_EXTRACT); | |
2539 | seq = get_insns (); | |
2540 | end_sequence (); | |
2541 | ||
2542 | validate_change (insn, &SET_SRC (body), newreg, 1); | |
2543 | } | |
2544 | } | |
2545 | ||
2546 | /* See if we can convert this extraction or insertion into | |
2547 | a simple move insn. We might not be able to do so if this | |
2548 | was, for example, part of a PARALLEL. | |
2549 | ||
2550 | If we succeed, write out any needed conversions. If we fail, | |
2551 | it is hard to guess why we failed, so don't do anything | |
2552 | special; just let the optimization be suppressed. */ | |
2553 | ||
2554 | if (apply_change_group () && seq) | |
2555 | emit_insns_before (seq, insn); | |
2556 | } | |
2557 | } | |
2558 | } | |
2559 | \f | |
2560 | /* These routines are responsible for converting virtual register references | |
2561 | to the actual hard register references once RTL generation is complete. | |
2562 | ||
2563 | The following four variables are used for communication between the | |
2564 | routines. They contain the offsets of the virtual registers from their | |
2565 | respective hard registers. */ | |
2566 | ||
2567 | static int in_arg_offset; | |
2568 | static int var_offset; | |
2569 | static int dynamic_offset; | |
2570 | static int out_arg_offset; | |
71038426 | 2571 | static int cfa_offset; |
6f086dfc RS |
2572 | |
2573 | /* In most machines, the stack pointer register is equivalent to the bottom | |
2574 | of the stack. */ | |
2575 | ||
2576 | #ifndef STACK_POINTER_OFFSET | |
2577 | #define STACK_POINTER_OFFSET 0 | |
2578 | #endif | |
2579 | ||
2580 | /* If not defined, pick an appropriate default for the offset of dynamically | |
2581 | allocated memory depending on the value of ACCUMULATE_OUTGOING_ARGS, | |
2582 | REG_PARM_STACK_SPACE, and OUTGOING_REG_PARM_STACK_SPACE. */ | |
2583 | ||
2584 | #ifndef STACK_DYNAMIC_OFFSET | |
2585 | ||
2586 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2587 | /* The bottom of the stack points to the actual arguments. If | |
2588 | REG_PARM_STACK_SPACE is defined, this includes the space for the register | |
2589 | parameters. However, if OUTGOING_REG_PARM_STACK space is not defined, | |
2590 | stack space for register parameters is not pushed by the caller, but | |
2591 | rather part of the fixed stack areas and hence not included in | |
2592 | `current_function_outgoing_args_size'. Nevertheless, we must allow | |
2593 | for it when allocating stack dynamic objects. */ | |
2594 | ||
2595 | #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) | |
2596 | #define STACK_DYNAMIC_OFFSET(FNDECL) \ | |
2597 | (current_function_outgoing_args_size \ | |
2598 | + REG_PARM_STACK_SPACE (FNDECL) + (STACK_POINTER_OFFSET)) | |
2599 | ||
2600 | #else | |
2601 | #define STACK_DYNAMIC_OFFSET(FNDECL) \ | |
2602 | (current_function_outgoing_args_size + (STACK_POINTER_OFFSET)) | |
2603 | #endif | |
2604 | ||
2605 | #else | |
2606 | #define STACK_DYNAMIC_OFFSET(FNDECL) STACK_POINTER_OFFSET | |
2607 | #endif | |
2608 | #endif | |
2609 | ||
71038426 RH |
2610 | /* On a few machines, the CFA coincides with the arg pointer. */ |
2611 | ||
2612 | #ifndef ARG_POINTER_CFA_OFFSET | |
2613 | #define ARG_POINTER_CFA_OFFSET 0 | |
2614 | #endif | |
2615 | ||
2616 | ||
e9a25f70 JL |
2617 | /* Build up a (MEM (ADDRESSOF (REG))) rtx for a register REG that just had |
2618 | its address taken. DECL is the decl for the object stored in the | |
2619 | register, for later use if we do need to force REG into the stack. | |
2620 | REG is overwritten by the MEM like in put_reg_into_stack. */ | |
2621 | ||
2622 | rtx | |
2623 | gen_mem_addressof (reg, decl) | |
2624 | rtx reg; | |
2625 | tree decl; | |
2626 | { | |
2627 | tree type = TREE_TYPE (decl); | |
8f985ec4 ZW |
2628 | rtx r = gen_rtx_ADDRESSOF (Pmode, gen_reg_rtx (GET_MODE (reg)), |
2629 | REGNO (reg), decl); | |
95ca22f4 MM |
2630 | /* If the original REG was a user-variable, then so is the REG whose |
2631 | address is being taken. */ | |
2632 | REG_USERVAR_P (XEXP (r, 0)) = REG_USERVAR_P (reg); | |
e9a25f70 JL |
2633 | |
2634 | XEXP (reg, 0) = r; | |
2635 | PUT_CODE (reg, MEM); | |
2636 | PUT_MODE (reg, DECL_MODE (decl)); | |
2637 | MEM_VOLATILE_P (reg) = TREE_SIDE_EFFECTS (decl); | |
c6df88cb | 2638 | MEM_SET_IN_STRUCT_P (reg, AGGREGATE_TYPE_P (type)); |
41472af8 | 2639 | MEM_ALIAS_SET (reg) = get_alias_set (decl); |
e9a25f70 | 2640 | |
e5e809f4 | 2641 | if (TREE_USED (decl) || DECL_INITIAL (decl) != 0) |
fe9b4957 | 2642 | fixup_var_refs (reg, GET_MODE (reg), TREE_UNSIGNED (type), 0); |
e5e809f4 | 2643 | |
e9a25f70 JL |
2644 | return reg; |
2645 | } | |
2646 | ||
2647 | /* If DECL has an RTL that is an ADDRESSOF rtx, put it into the stack. */ | |
2648 | ||
2649 | void | |
2650 | flush_addressof (decl) | |
2651 | tree decl; | |
2652 | { | |
2653 | if ((TREE_CODE (decl) == PARM_DECL || TREE_CODE (decl) == VAR_DECL) | |
2654 | && DECL_RTL (decl) != 0 | |
2655 | && GET_CODE (DECL_RTL (decl)) == MEM | |
2656 | && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF | |
2657 | && GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == REG) | |
fe9b4957 | 2658 | put_addressof_into_stack (XEXP (DECL_RTL (decl), 0), 0); |
e9a25f70 JL |
2659 | } |
2660 | ||
2661 | /* Force the register pointed to by R, an ADDRESSOF rtx, into the stack. */ | |
2662 | ||
2663 | static void | |
fe9b4957 | 2664 | put_addressof_into_stack (r, ht) |
e9a25f70 | 2665 | rtx r; |
fe9b4957 | 2666 | struct hash_table *ht; |
e9a25f70 JL |
2667 | { |
2668 | tree decl = ADDRESSOF_DECL (r); | |
2669 | rtx reg = XEXP (r, 0); | |
2670 | ||
2671 | if (GET_CODE (reg) != REG) | |
2672 | abort (); | |
2673 | ||
2674 | put_reg_into_stack (0, reg, TREE_TYPE (decl), GET_MODE (reg), | |
2675 | DECL_MODE (decl), TREE_SIDE_EFFECTS (decl), | |
e5e809f4 | 2676 | ADDRESSOF_REGNO (r), |
fe9b4957 | 2677 | TREE_USED (decl) || DECL_INITIAL (decl) != 0, ht); |
e9a25f70 JL |
2678 | } |
2679 | ||
b5bd3b3c AS |
2680 | /* List of replacements made below in purge_addressof_1 when creating |
2681 | bitfield insertions. */ | |
8b04083b VM |
2682 | static rtx purge_bitfield_addressof_replacements; |
2683 | ||
2684 | /* List of replacements made below in purge_addressof_1 for patterns | |
2685 | (MEM (ADDRESSOF (REG ...))). The key of the list entry is the | |
2686 | corresponding (ADDRESSOF (REG ...)) and value is a substitution for | |
2687 | the all pattern. List PURGE_BITFIELD_ADDRESSOF_REPLACEMENTS is not | |
2688 | enough in complex cases, e.g. when some field values can be | |
2689 | extracted by usage MEM with narrower mode. */ | |
b5bd3b3c AS |
2690 | static rtx purge_addressof_replacements; |
2691 | ||
e9a25f70 JL |
2692 | /* Helper function for purge_addressof. See if the rtx expression at *LOC |
2693 | in INSN needs to be changed. If FORCE, always put any ADDRESSOFs into | |
2694 | the stack. */ | |
2695 | ||
2696 | static void | |
fe9b4957 | 2697 | purge_addressof_1 (loc, insn, force, store, ht) |
e9a25f70 JL |
2698 | rtx *loc; |
2699 | rtx insn; | |
f7b6d104 | 2700 | int force, store; |
fe9b4957 | 2701 | struct hash_table *ht; |
e9a25f70 JL |
2702 | { |
2703 | rtx x; | |
2704 | RTX_CODE code; | |
2705 | int i, j; | |
6f7d635c | 2706 | const char *fmt; |
e9a25f70 JL |
2707 | |
2708 | /* Re-start here to avoid recursion in common cases. */ | |
2709 | restart: | |
2710 | ||
2711 | x = *loc; | |
2712 | if (x == 0) | |
2713 | return; | |
2714 | ||
2715 | code = GET_CODE (x); | |
2716 | ||
2717 | if (code == ADDRESSOF && GET_CODE (XEXP (x, 0)) == MEM) | |
2718 | { | |
2719 | rtx insns; | |
956d6950 JL |
2720 | /* We must create a copy of the rtx because it was created by |
2721 | overwriting a REG rtx which is always shared. */ | |
2722 | rtx sub = copy_rtx (XEXP (XEXP (x, 0), 0)); | |
e9a25f70 | 2723 | |
ab87f8c8 JL |
2724 | if (validate_change (insn, loc, sub, 0) |
2725 | || validate_replace_rtx (x, sub, insn)) | |
e9a25f70 | 2726 | return; |
ab87f8c8 | 2727 | |
e9a25f70 | 2728 | start_sequence (); |
ab87f8c8 JL |
2729 | sub = force_operand (sub, NULL_RTX); |
2730 | if (! validate_change (insn, loc, sub, 0) | |
2731 | && ! validate_replace_rtx (x, sub, insn)) | |
e9a25f70 JL |
2732 | abort (); |
2733 | ||
f7b6d104 | 2734 | insns = gen_sequence (); |
e9a25f70 | 2735 | end_sequence (); |
18e765cb | 2736 | emit_insn_before (insns, insn); |
e9a25f70 JL |
2737 | return; |
2738 | } | |
2739 | else if (code == MEM && GET_CODE (XEXP (x, 0)) == ADDRESSOF && ! force) | |
2740 | { | |
2741 | rtx sub = XEXP (XEXP (x, 0), 0); | |
ab87f8c8 | 2742 | rtx sub2; |
e5e809f4 | 2743 | |
6d8ccdbb | 2744 | if (GET_CODE (sub) == MEM) |
ab87f8c8 JL |
2745 | { |
2746 | sub2 = gen_rtx_MEM (GET_MODE (x), copy_rtx (XEXP (sub, 0))); | |
2747 | MEM_COPY_ATTRIBUTES (sub2, sub); | |
2748 | RTX_UNCHANGING_P (sub2) = RTX_UNCHANGING_P (sub); | |
2749 | sub = sub2; | |
2750 | } | |
e5e809f4 | 2751 | |
f5963e61 JL |
2752 | if (GET_CODE (sub) == REG |
2753 | && (MEM_VOLATILE_P (x) || GET_MODE (x) == BLKmode)) | |
e5e809f4 | 2754 | { |
fe9b4957 | 2755 | put_addressof_into_stack (XEXP (x, 0), ht); |
e5e809f4 JL |
2756 | return; |
2757 | } | |
2758 | else if (GET_CODE (sub) == REG && GET_MODE (x) != GET_MODE (sub)) | |
e9a25f70 | 2759 | { |
f7b6d104 RH |
2760 | int size_x, size_sub; |
2761 | ||
b5bd3b3c AS |
2762 | if (!insn) |
2763 | { | |
2764 | /* When processing REG_NOTES look at the list of | |
2765 | replacements done on the insn to find the register that X | |
2766 | was replaced by. */ | |
2767 | rtx tem; | |
2768 | ||
8b04083b VM |
2769 | for (tem = purge_bitfield_addressof_replacements; |
2770 | tem != NULL_RTX; | |
b5bd3b3c | 2771 | tem = XEXP (XEXP (tem, 1), 1)) |
8b04083b VM |
2772 | if (rtx_equal_p (x, XEXP (tem, 0))) |
2773 | { | |
2774 | *loc = XEXP (XEXP (tem, 1), 0); | |
2775 | return; | |
2776 | } | |
fbdfe39c | 2777 | |
8b04083b VM |
2778 | /* See comment for purge_addressof_replacements. */ |
2779 | for (tem = purge_addressof_replacements; | |
2780 | tem != NULL_RTX; | |
2781 | tem = XEXP (XEXP (tem, 1), 1)) | |
2782 | if (rtx_equal_p (XEXP (x, 0), XEXP (tem, 0))) | |
2783 | { | |
2784 | rtx z = XEXP (XEXP (tem, 1), 0); | |
fbdfe39c | 2785 | |
8b04083b VM |
2786 | if (GET_MODE (x) == GET_MODE (z) |
2787 | || (GET_CODE (XEXP (XEXP (tem, 1), 0)) != REG | |
2788 | && GET_CODE (XEXP (XEXP (tem, 1), 0)) != SUBREG)) | |
2789 | abort (); | |
2790 | ||
2791 | /* It can happen that the note may speak of things | |
2792 | in a wider (or just different) mode than the | |
2793 | code did. This is especially true of | |
2794 | REG_RETVAL. */ | |
2795 | ||
2796 | if (GET_CODE (z) == SUBREG && SUBREG_WORD (z) == 0) | |
2797 | z = SUBREG_REG (z); | |
2798 | ||
2799 | if (GET_MODE_SIZE (GET_MODE (x)) > UNITS_PER_WORD | |
2800 | && (GET_MODE_SIZE (GET_MODE (x)) | |
2801 | > GET_MODE_SIZE (GET_MODE (z)))) | |
2802 | { | |
2803 | /* This can occur as a result in invalid | |
2804 | pointer casts, e.g. float f; ... | |
2805 | *(long long int *)&f. | |
2806 | ??? We could emit a warning here, but | |
2807 | without a line number that wouldn't be | |
2808 | very helpful. */ | |
2809 | z = gen_rtx_SUBREG (GET_MODE (x), z, 0); | |
2810 | } | |
2811 | else | |
2812 | z = gen_lowpart (GET_MODE (x), z); | |
2813 | ||
2814 | *loc = z; | |
2815 | return; | |
2816 | } | |
b5bd3b3c AS |
2817 | |
2818 | /* There should always be such a replacement. */ | |
2819 | abort (); | |
2820 | } | |
2821 | ||
f7b6d104 RH |
2822 | size_x = GET_MODE_BITSIZE (GET_MODE (x)); |
2823 | size_sub = GET_MODE_BITSIZE (GET_MODE (sub)); | |
2824 | ||
2825 | /* Don't even consider working with paradoxical subregs, | |
2826 | or the moral equivalent seen here. */ | |
470032d7 | 2827 | if (size_x <= size_sub |
d006aa54 | 2828 | && int_mode_for_mode (GET_MODE (sub)) != BLKmode) |
e9a25f70 | 2829 | { |
f7b6d104 RH |
2830 | /* Do a bitfield insertion to mirror what would happen |
2831 | in memory. */ | |
2832 | ||
f7b6d104 RH |
2833 | rtx val, seq; |
2834 | ||
f7b6d104 RH |
2835 | if (store) |
2836 | { | |
fe9b4957 | 2837 | rtx p = PREV_INSN (insn); |
de0dd934 | 2838 | |
f7b6d104 RH |
2839 | start_sequence (); |
2840 | val = gen_reg_rtx (GET_MODE (x)); | |
2841 | if (! validate_change (insn, loc, val, 0)) | |
b5bd3b3c AS |
2842 | { |
2843 | /* Discard the current sequence and put the | |
2844 | ADDRESSOF on stack. */ | |
2845 | end_sequence (); | |
2846 | goto give_up; | |
2847 | } | |
f7b6d104 RH |
2848 | seq = gen_sequence (); |
2849 | end_sequence (); | |
2850 | emit_insn_before (seq, insn); | |
fe9b4957 MM |
2851 | compute_insns_for_mem (p ? NEXT_INSN (p) : get_insns (), |
2852 | insn, ht); | |
f7b6d104 RH |
2853 | |
2854 | start_sequence (); | |
47401c4d | 2855 | store_bit_field (sub, size_x, 0, GET_MODE (x), |
f7b6d104 RH |
2856 | val, GET_MODE_SIZE (GET_MODE (sub)), |
2857 | GET_MODE_SIZE (GET_MODE (sub))); | |
2858 | ||
de0dd934 R |
2859 | /* Make sure to unshare any shared rtl that store_bit_field |
2860 | might have created. */ | |
2861 | for (p = get_insns(); p; p = NEXT_INSN (p)) | |
2862 | { | |
2863 | reset_used_flags (PATTERN (p)); | |
2864 | reset_used_flags (REG_NOTES (p)); | |
2865 | reset_used_flags (LOG_LINKS (p)); | |
2866 | } | |
2867 | unshare_all_rtl (get_insns ()); | |
2868 | ||
f7b6d104 RH |
2869 | seq = gen_sequence (); |
2870 | end_sequence (); | |
fe9b4957 MM |
2871 | p = emit_insn_after (seq, insn); |
2872 | if (NEXT_INSN (insn)) | |
2873 | compute_insns_for_mem (NEXT_INSN (insn), | |
2874 | p ? NEXT_INSN (p) : NULL_RTX, | |
2875 | ht); | |
f7b6d104 RH |
2876 | } |
2877 | else | |
2878 | { | |
fe9b4957 MM |
2879 | rtx p = PREV_INSN (insn); |
2880 | ||
f7b6d104 | 2881 | start_sequence (); |
47401c4d | 2882 | val = extract_bit_field (sub, size_x, 0, 1, NULL_RTX, |
f7b6d104 RH |
2883 | GET_MODE (x), GET_MODE (x), |
2884 | GET_MODE_SIZE (GET_MODE (sub)), | |
2885 | GET_MODE_SIZE (GET_MODE (sub))); | |
2886 | ||
f7b6d104 | 2887 | if (! validate_change (insn, loc, val, 0)) |
b5bd3b3c AS |
2888 | { |
2889 | /* Discard the current sequence and put the | |
2890 | ADDRESSOF on stack. */ | |
2891 | end_sequence (); | |
2892 | goto give_up; | |
2893 | } | |
f7b6d104 RH |
2894 | |
2895 | seq = gen_sequence (); | |
2896 | end_sequence (); | |
2897 | emit_insn_before (seq, insn); | |
fe9b4957 MM |
2898 | compute_insns_for_mem (p ? NEXT_INSN (p) : get_insns (), |
2899 | insn, ht); | |
f7b6d104 RH |
2900 | } |
2901 | ||
b5bd3b3c AS |
2902 | /* Remember the replacement so that the same one can be done |
2903 | on the REG_NOTES. */ | |
8b04083b | 2904 | purge_bitfield_addressof_replacements |
b5bd3b3c | 2905 | = gen_rtx_EXPR_LIST (VOIDmode, x, |
8b04083b VM |
2906 | gen_rtx_EXPR_LIST |
2907 | (VOIDmode, val, | |
2908 | purge_bitfield_addressof_replacements)); | |
b5bd3b3c | 2909 | |
f7b6d104 RH |
2910 | /* We replaced with a reg -- all done. */ |
2911 | return; | |
e9a25f70 JL |
2912 | } |
2913 | } | |
2914 | else if (validate_change (insn, loc, sub, 0)) | |
fbdfe39c RH |
2915 | { |
2916 | /* Remember the replacement so that the same one can be done | |
2917 | on the REG_NOTES. */ | |
8b04083b VM |
2918 | if (GET_CODE (sub) == REG || GET_CODE (sub) == SUBREG) |
2919 | { | |
2920 | rtx tem; | |
2921 | ||
2922 | for (tem = purge_addressof_replacements; | |
2923 | tem != NULL_RTX; | |
2924 | tem = XEXP (XEXP (tem, 1), 1)) | |
2925 | if (rtx_equal_p (XEXP (x, 0), XEXP (tem, 0))) | |
2926 | { | |
2927 | XEXP (XEXP (tem, 1), 0) = sub; | |
2928 | return; | |
2929 | } | |
2930 | purge_addressof_replacements | |
2931 | = gen_rtx (EXPR_LIST, VOIDmode, XEXP (x, 0), | |
2932 | gen_rtx_EXPR_LIST (VOIDmode, sub, | |
2933 | purge_addressof_replacements)); | |
2934 | return; | |
2935 | } | |
fbdfe39c RH |
2936 | goto restart; |
2937 | } | |
b5bd3b3c | 2938 | give_up:; |
e9a25f70 JL |
2939 | /* else give up and put it into the stack */ |
2940 | } | |
2941 | else if (code == ADDRESSOF) | |
2942 | { | |
fe9b4957 | 2943 | put_addressof_into_stack (x, ht); |
e9a25f70 JL |
2944 | return; |
2945 | } | |
f7b6d104 RH |
2946 | else if (code == SET) |
2947 | { | |
fe9b4957 MM |
2948 | purge_addressof_1 (&SET_DEST (x), insn, force, 1, ht); |
2949 | purge_addressof_1 (&SET_SRC (x), insn, force, 0, ht); | |
f7b6d104 RH |
2950 | return; |
2951 | } | |
e9a25f70 JL |
2952 | |
2953 | /* Scan all subexpressions. */ | |
2954 | fmt = GET_RTX_FORMAT (code); | |
2955 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
2956 | { | |
2957 | if (*fmt == 'e') | |
fe9b4957 | 2958 | purge_addressof_1 (&XEXP (x, i), insn, force, 0, ht); |
e9a25f70 JL |
2959 | else if (*fmt == 'E') |
2960 | for (j = 0; j < XVECLEN (x, i); j++) | |
fe9b4957 MM |
2961 | purge_addressof_1 (&XVECEXP (x, i, j), insn, force, 0, ht); |
2962 | } | |
2963 | } | |
2964 | ||
2965 | /* Return a new hash table entry in HT. */ | |
2966 | ||
2967 | static struct hash_entry * | |
2968 | insns_for_mem_newfunc (he, ht, k) | |
2969 | struct hash_entry *he; | |
2970 | struct hash_table *ht; | |
2971 | hash_table_key k ATTRIBUTE_UNUSED; | |
2972 | { | |
2973 | struct insns_for_mem_entry *ifmhe; | |
2974 | if (he) | |
2975 | return he; | |
2976 | ||
2977 | ifmhe = ((struct insns_for_mem_entry *) | |
2978 | hash_allocate (ht, sizeof (struct insns_for_mem_entry))); | |
2979 | ifmhe->insns = NULL_RTX; | |
2980 | ||
2981 | return &ifmhe->he; | |
2982 | } | |
2983 | ||
2984 | /* Return a hash value for K, a REG. */ | |
2985 | ||
2986 | static unsigned long | |
2987 | insns_for_mem_hash (k) | |
2988 | hash_table_key k; | |
2989 | { | |
2990 | /* K is really a RTX. Just use the address as the hash value. */ | |
2991 | return (unsigned long) k; | |
2992 | } | |
2993 | ||
2994 | /* Return non-zero if K1 and K2 (two REGs) are the same. */ | |
2995 | ||
2996 | static boolean | |
2997 | insns_for_mem_comp (k1, k2) | |
2998 | hash_table_key k1; | |
2999 | hash_table_key k2; | |
3000 | { | |
3001 | return k1 == k2; | |
3002 | } | |
3003 | ||
3004 | struct insns_for_mem_walk_info { | |
3005 | /* The hash table that we are using to record which INSNs use which | |
3006 | MEMs. */ | |
3007 | struct hash_table *ht; | |
3008 | ||
3009 | /* The INSN we are currently proessing. */ | |
3010 | rtx insn; | |
3011 | ||
3012 | /* Zero if we are walking to find ADDRESSOFs, one if we are walking | |
3013 | to find the insns that use the REGs in the ADDRESSOFs. */ | |
3014 | int pass; | |
3015 | }; | |
3016 | ||
3017 | /* Called from compute_insns_for_mem via for_each_rtx. If R is a REG | |
3018 | that might be used in an ADDRESSOF expression, record this INSN in | |
3019 | the hash table given by DATA (which is really a pointer to an | |
3020 | insns_for_mem_walk_info structure). */ | |
3021 | ||
3022 | static int | |
3023 | insns_for_mem_walk (r, data) | |
3024 | rtx *r; | |
3025 | void *data; | |
3026 | { | |
3027 | struct insns_for_mem_walk_info *ifmwi | |
3028 | = (struct insns_for_mem_walk_info *) data; | |
3029 | ||
3030 | if (ifmwi->pass == 0 && *r && GET_CODE (*r) == ADDRESSOF | |
3031 | && GET_CODE (XEXP (*r, 0)) == REG) | |
3032 | hash_lookup (ifmwi->ht, XEXP (*r, 0), /*create=*/1, /*copy=*/0); | |
3033 | else if (ifmwi->pass == 1 && *r && GET_CODE (*r) == REG) | |
3034 | { | |
3035 | /* Lookup this MEM in the hashtable, creating it if necessary. */ | |
3036 | struct insns_for_mem_entry *ifme | |
3037 | = (struct insns_for_mem_entry *) hash_lookup (ifmwi->ht, | |
3038 | *r, | |
3039 | /*create=*/0, | |
3040 | /*copy=*/0); | |
3041 | ||
3042 | /* If we have not already recorded this INSN, do so now. Since | |
3043 | we process the INSNs in order, we know that if we have | |
3044 | recorded it it must be at the front of the list. */ | |
3045 | if (ifme && (!ifme->insns || XEXP (ifme->insns, 0) != ifmwi->insn)) | |
3046 | { | |
3047 | /* We do the allocation on the same obstack as is used for | |
3048 | the hash table since this memory will not be used once | |
3049 | the hash table is deallocated. */ | |
3050 | push_obstacks (&ifmwi->ht->memory, &ifmwi->ht->memory); | |
3051 | ifme->insns = gen_rtx_EXPR_LIST (VOIDmode, ifmwi->insn, | |
3052 | ifme->insns); | |
3053 | pop_obstacks (); | |
3054 | } | |
e9a25f70 | 3055 | } |
fe9b4957 MM |
3056 | |
3057 | return 0; | |
3058 | } | |
3059 | ||
3060 | /* Walk the INSNS, until we reach LAST_INSN, recording which INSNs use | |
3061 | which REGs in HT. */ | |
3062 | ||
3063 | static void | |
3064 | compute_insns_for_mem (insns, last_insn, ht) | |
3065 | rtx insns; | |
3066 | rtx last_insn; | |
3067 | struct hash_table *ht; | |
3068 | { | |
3069 | rtx insn; | |
3070 | struct insns_for_mem_walk_info ifmwi; | |
3071 | ifmwi.ht = ht; | |
3072 | ||
3073 | for (ifmwi.pass = 0; ifmwi.pass < 2; ++ifmwi.pass) | |
3074 | for (insn = insns; insn != last_insn; insn = NEXT_INSN (insn)) | |
3075 | if (GET_RTX_CLASS (GET_CODE (insn)) == 'i') | |
3076 | { | |
3077 | ifmwi.insn = insn; | |
3078 | for_each_rtx (&insn, insns_for_mem_walk, &ifmwi); | |
3079 | } | |
e9a25f70 JL |
3080 | } |
3081 | ||
3082 | /* Eliminate all occurrences of ADDRESSOF from INSNS. Elide any remaining | |
3083 | (MEM (ADDRESSOF)) patterns, and force any needed registers into the | |
3084 | stack. */ | |
3085 | ||
3086 | void | |
3087 | purge_addressof (insns) | |
3088 | rtx insns; | |
3089 | { | |
3090 | rtx insn; | |
fe9b4957 MM |
3091 | struct hash_table ht; |
3092 | ||
3093 | /* When we actually purge ADDRESSOFs, we turn REGs into MEMs. That | |
3094 | requires a fixup pass over the instruction stream to correct | |
3095 | INSNs that depended on the REG being a REG, and not a MEM. But, | |
3096 | these fixup passes are slow. Furthermore, more MEMs are not | |
3097 | mentioned in very many instructions. So, we speed up the process | |
3098 | by pre-calculating which REGs occur in which INSNs; that allows | |
3099 | us to perform the fixup passes much more quickly. */ | |
3100 | hash_table_init (&ht, | |
3101 | insns_for_mem_newfunc, | |
3102 | insns_for_mem_hash, | |
3103 | insns_for_mem_comp); | |
3104 | compute_insns_for_mem (insns, NULL_RTX, &ht); | |
3105 | ||
e9a25f70 JL |
3106 | for (insn = insns; insn; insn = NEXT_INSN (insn)) |
3107 | if (GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN | |
3108 | || GET_CODE (insn) == CALL_INSN) | |
3109 | { | |
3110 | purge_addressof_1 (&PATTERN (insn), insn, | |
fe9b4957 MM |
3111 | asm_noperands (PATTERN (insn)) > 0, 0, &ht); |
3112 | purge_addressof_1 (®_NOTES (insn), NULL_RTX, 0, 0, &ht); | |
e9a25f70 | 3113 | } |
fe9b4957 MM |
3114 | |
3115 | /* Clean up. */ | |
3116 | hash_table_free (&ht); | |
8b04083b | 3117 | purge_bitfield_addressof_replacements = 0; |
da9b1f9c | 3118 | purge_addressof_replacements = 0; |
e9a25f70 JL |
3119 | } |
3120 | \f | |
6f086dfc RS |
3121 | /* Pass through the INSNS of function FNDECL and convert virtual register |
3122 | references to hard register references. */ | |
3123 | ||
3124 | void | |
3125 | instantiate_virtual_regs (fndecl, insns) | |
3126 | tree fndecl; | |
3127 | rtx insns; | |
3128 | { | |
3129 | rtx insn; | |
e9a25f70 | 3130 | int i; |
6f086dfc RS |
3131 | |
3132 | /* Compute the offsets to use for this function. */ | |
3133 | in_arg_offset = FIRST_PARM_OFFSET (fndecl); | |
3134 | var_offset = STARTING_FRAME_OFFSET; | |
3135 | dynamic_offset = STACK_DYNAMIC_OFFSET (fndecl); | |
3136 | out_arg_offset = STACK_POINTER_OFFSET; | |
71038426 | 3137 | cfa_offset = ARG_POINTER_CFA_OFFSET; |
6f086dfc RS |
3138 | |
3139 | /* Scan all variables and parameters of this function. For each that is | |
3140 | in memory, instantiate all virtual registers if the result is a valid | |
3141 | address. If not, we do it later. That will handle most uses of virtual | |
3142 | regs on many machines. */ | |
3143 | instantiate_decls (fndecl, 1); | |
3144 | ||
3145 | /* Initialize recognition, indicating that volatile is OK. */ | |
3146 | init_recog (); | |
3147 | ||
3148 | /* Scan through all the insns, instantiating every virtual register still | |
3149 | present. */ | |
3150 | for (insn = insns; insn; insn = NEXT_INSN (insn)) | |
3151 | if (GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN | |
3152 | || GET_CODE (insn) == CALL_INSN) | |
3153 | { | |
3154 | instantiate_virtual_regs_1 (&PATTERN (insn), insn, 1); | |
5f4f0e22 | 3155 | instantiate_virtual_regs_1 (®_NOTES (insn), NULL_RTX, 0); |
6f086dfc RS |
3156 | } |
3157 | ||
e9a25f70 JL |
3158 | /* Instantiate the stack slots for the parm registers, for later use in |
3159 | addressof elimination. */ | |
3160 | for (i = 0; i < max_parm_reg; ++i) | |
3161 | if (parm_reg_stack_loc[i]) | |
3162 | instantiate_virtual_regs_1 (&parm_reg_stack_loc[i], NULL_RTX, 0); | |
3163 | ||
6f086dfc RS |
3164 | /* Now instantiate the remaining register equivalences for debugging info. |
3165 | These will not be valid addresses. */ | |
3166 | instantiate_decls (fndecl, 0); | |
3167 | ||
3168 | /* Indicate that, from now on, assign_stack_local should use | |
3169 | frame_pointer_rtx. */ | |
3170 | virtuals_instantiated = 1; | |
3171 | } | |
3172 | ||
3173 | /* Scan all decls in FNDECL (both variables and parameters) and instantiate | |
3174 | all virtual registers in their DECL_RTL's. | |
3175 | ||
3176 | If VALID_ONLY, do this only if the resulting address is still valid. | |
3177 | Otherwise, always do it. */ | |
3178 | ||
3179 | static void | |
3180 | instantiate_decls (fndecl, valid_only) | |
3181 | tree fndecl; | |
3182 | int valid_only; | |
3183 | { | |
3184 | tree decl; | |
3185 | ||
e1686233 | 3186 | if (DECL_SAVED_INSNS (fndecl)) |
6f086dfc RS |
3187 | /* When compiling an inline function, the obstack used for |
3188 | rtl allocation is the maybepermanent_obstack. Calling | |
3189 | `resume_temporary_allocation' switches us back to that | |
3190 | obstack while we process this function's parameters. */ | |
3191 | resume_temporary_allocation (); | |
3192 | ||
3193 | /* Process all parameters of the function. */ | |
3194 | for (decl = DECL_ARGUMENTS (fndecl); decl; decl = TREE_CHAIN (decl)) | |
3195 | { | |
e5e809f4 JL |
3196 | HOST_WIDE_INT size = int_size_in_bytes (TREE_TYPE (decl)); |
3197 | ||
ce717ce4 JW |
3198 | instantiate_decl (DECL_RTL (decl), size, valid_only); |
3199 | ||
3200 | /* If the parameter was promoted, then the incoming RTL mode may be | |
3201 | larger than the declared type size. We must use the larger of | |
3202 | the two sizes. */ | |
3203 | size = MAX (GET_MODE_SIZE (GET_MODE (DECL_INCOMING_RTL (decl))), size); | |
3204 | instantiate_decl (DECL_INCOMING_RTL (decl), size, valid_only); | |
6f086dfc RS |
3205 | } |
3206 | ||
0f41302f | 3207 | /* Now process all variables defined in the function or its subblocks. */ |
6f086dfc RS |
3208 | instantiate_decls_1 (DECL_INITIAL (fndecl), valid_only); |
3209 | ||
79c0672e | 3210 | if (DECL_INLINE (fndecl) || DECL_DEFER_OUTPUT (fndecl)) |
6f086dfc RS |
3211 | { |
3212 | /* Save all rtl allocated for this function by raising the | |
3213 | high-water mark on the maybepermanent_obstack. */ | |
3214 | preserve_data (); | |
3215 | /* All further rtl allocation is now done in the current_obstack. */ | |
3216 | rtl_in_current_obstack (); | |
3217 | } | |
3218 | } | |
3219 | ||
3220 | /* Subroutine of instantiate_decls: Process all decls in the given | |
3221 | BLOCK node and all its subblocks. */ | |
3222 | ||
3223 | static void | |
3224 | instantiate_decls_1 (let, valid_only) | |
3225 | tree let; | |
3226 | int valid_only; | |
3227 | { | |
3228 | tree t; | |
3229 | ||
3230 | for (t = BLOCK_VARS (let); t; t = TREE_CHAIN (t)) | |
5a73491b RK |
3231 | instantiate_decl (DECL_RTL (t), int_size_in_bytes (TREE_TYPE (t)), |
3232 | valid_only); | |
6f086dfc RS |
3233 | |
3234 | /* Process all subblocks. */ | |
3235 | for (t = BLOCK_SUBBLOCKS (let); t; t = TREE_CHAIN (t)) | |
3236 | instantiate_decls_1 (t, valid_only); | |
3237 | } | |
5a73491b | 3238 | |
8008b228 | 3239 | /* Subroutine of the preceding procedures: Given RTL representing a |
5a73491b RK |
3240 | decl and the size of the object, do any instantiation required. |
3241 | ||
3242 | If VALID_ONLY is non-zero, it means that the RTL should only be | |
3243 | changed if the new address is valid. */ | |
3244 | ||
3245 | static void | |
3246 | instantiate_decl (x, size, valid_only) | |
3247 | rtx x; | |
3248 | int size; | |
3249 | int valid_only; | |
3250 | { | |
3251 | enum machine_mode mode; | |
3252 | rtx addr; | |
3253 | ||
3254 | /* If this is not a MEM, no need to do anything. Similarly if the | |
3255 | address is a constant or a register that is not a virtual register. */ | |
3256 | ||
3257 | if (x == 0 || GET_CODE (x) != MEM) | |
3258 | return; | |
3259 | ||
3260 | addr = XEXP (x, 0); | |
3261 | if (CONSTANT_P (addr) | |
956d6950 | 3262 | || (GET_CODE (addr) == ADDRESSOF && GET_CODE (XEXP (addr, 0)) == REG) |
5a73491b RK |
3263 | || (GET_CODE (addr) == REG |
3264 | && (REGNO (addr) < FIRST_VIRTUAL_REGISTER | |
3265 | || REGNO (addr) > LAST_VIRTUAL_REGISTER))) | |
3266 | return; | |
3267 | ||
3268 | /* If we should only do this if the address is valid, copy the address. | |
3269 | We need to do this so we can undo any changes that might make the | |
3270 | address invalid. This copy is unfortunate, but probably can't be | |
3271 | avoided. */ | |
3272 | ||
3273 | if (valid_only) | |
3274 | addr = copy_rtx (addr); | |
3275 | ||
3276 | instantiate_virtual_regs_1 (&addr, NULL_RTX, 0); | |
3277 | ||
87ce34d6 JW |
3278 | if (valid_only) |
3279 | { | |
3280 | /* Now verify that the resulting address is valid for every integer or | |
3281 | floating-point mode up to and including SIZE bytes long. We do this | |
3282 | since the object might be accessed in any mode and frame addresses | |
3283 | are shared. */ | |
3284 | ||
3285 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); | |
3286 | mode != VOIDmode && GET_MODE_SIZE (mode) <= size; | |
3287 | mode = GET_MODE_WIDER_MODE (mode)) | |
3288 | if (! memory_address_p (mode, addr)) | |
3289 | return; | |
5a73491b | 3290 | |
87ce34d6 JW |
3291 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); |
3292 | mode != VOIDmode && GET_MODE_SIZE (mode) <= size; | |
3293 | mode = GET_MODE_WIDER_MODE (mode)) | |
3294 | if (! memory_address_p (mode, addr)) | |
3295 | return; | |
3296 | } | |
5a73491b | 3297 | |
87ce34d6 JW |
3298 | /* Put back the address now that we have updated it and we either know |
3299 | it is valid or we don't care whether it is valid. */ | |
5a73491b RK |
3300 | |
3301 | XEXP (x, 0) = addr; | |
3302 | } | |
6f086dfc RS |
3303 | \f |
3304 | /* Given a pointer to a piece of rtx and an optional pointer to the | |
3305 | containing object, instantiate any virtual registers present in it. | |
3306 | ||
3307 | If EXTRA_INSNS, we always do the replacement and generate | |
3308 | any extra insns before OBJECT. If it zero, we do nothing if replacement | |
3309 | is not valid. | |
3310 | ||
3311 | Return 1 if we either had nothing to do or if we were able to do the | |
3312 | needed replacement. Return 0 otherwise; we only return zero if | |
3313 | EXTRA_INSNS is zero. | |
3314 | ||
3315 | We first try some simple transformations to avoid the creation of extra | |
3316 | pseudos. */ | |
3317 | ||
3318 | static int | |
3319 | instantiate_virtual_regs_1 (loc, object, extra_insns) | |
3320 | rtx *loc; | |
3321 | rtx object; | |
3322 | int extra_insns; | |
3323 | { | |
3324 | rtx x; | |
3325 | RTX_CODE code; | |
3326 | rtx new = 0; | |
07444f1d | 3327 | HOST_WIDE_INT offset = 0; |
6f086dfc RS |
3328 | rtx temp; |
3329 | rtx seq; | |
3330 | int i, j; | |
6f7d635c | 3331 | const char *fmt; |
6f086dfc RS |
3332 | |
3333 | /* Re-start here to avoid recursion in common cases. */ | |
3334 | restart: | |
3335 | ||
3336 | x = *loc; | |
3337 | if (x == 0) | |
3338 | return 1; | |
3339 | ||
3340 | code = GET_CODE (x); | |
3341 | ||
3342 | /* Check for some special cases. */ | |
3343 | switch (code) | |
3344 | { | |
3345 | case CONST_INT: | |
3346 | case CONST_DOUBLE: | |
3347 | case CONST: | |
3348 | case SYMBOL_REF: | |
3349 | case CODE_LABEL: | |
3350 | case PC: | |
3351 | case CC0: | |
3352 | case ASM_INPUT: | |
3353 | case ADDR_VEC: | |
3354 | case ADDR_DIFF_VEC: | |
3355 | case RETURN: | |
3356 | return 1; | |
3357 | ||
3358 | case SET: | |
3359 | /* We are allowed to set the virtual registers. This means that | |
38e01259 | 3360 | the actual register should receive the source minus the |
6f086dfc RS |
3361 | appropriate offset. This is used, for example, in the handling |
3362 | of non-local gotos. */ | |
3363 | if (SET_DEST (x) == virtual_incoming_args_rtx) | |
3364 | new = arg_pointer_rtx, offset = - in_arg_offset; | |
3365 | else if (SET_DEST (x) == virtual_stack_vars_rtx) | |
dfd3dae6 | 3366 | new = frame_pointer_rtx, offset = - var_offset; |
6f086dfc RS |
3367 | else if (SET_DEST (x) == virtual_stack_dynamic_rtx) |
3368 | new = stack_pointer_rtx, offset = - dynamic_offset; | |
3369 | else if (SET_DEST (x) == virtual_outgoing_args_rtx) | |
3370 | new = stack_pointer_rtx, offset = - out_arg_offset; | |
71038426 RH |
3371 | else if (SET_DEST (x) == virtual_cfa_rtx) |
3372 | new = arg_pointer_rtx, offset = - cfa_offset; | |
6f086dfc RS |
3373 | |
3374 | if (new) | |
3375 | { | |
3376 | /* The only valid sources here are PLUS or REG. Just do | |
3377 | the simplest possible thing to handle them. */ | |
3378 | if (GET_CODE (SET_SRC (x)) != REG | |
3379 | && GET_CODE (SET_SRC (x)) != PLUS) | |
3380 | abort (); | |
3381 | ||
3382 | start_sequence (); | |
3383 | if (GET_CODE (SET_SRC (x)) != REG) | |
5f4f0e22 | 3384 | temp = force_operand (SET_SRC (x), NULL_RTX); |
6f086dfc RS |
3385 | else |
3386 | temp = SET_SRC (x); | |
5f4f0e22 | 3387 | temp = force_operand (plus_constant (temp, offset), NULL_RTX); |
6f086dfc RS |
3388 | seq = get_insns (); |
3389 | end_sequence (); | |
3390 | ||
3391 | emit_insns_before (seq, object); | |
3392 | SET_DEST (x) = new; | |
3393 | ||
e9a25f70 | 3394 | if (! validate_change (object, &SET_SRC (x), temp, 0) |
6f086dfc RS |
3395 | || ! extra_insns) |
3396 | abort (); | |
3397 | ||
3398 | return 1; | |
3399 | } | |
3400 | ||
3401 | instantiate_virtual_regs_1 (&SET_DEST (x), object, extra_insns); | |
3402 | loc = &SET_SRC (x); | |
3403 | goto restart; | |
3404 | ||
3405 | case PLUS: | |
3406 | /* Handle special case of virtual register plus constant. */ | |
3407 | if (CONSTANT_P (XEXP (x, 1))) | |
3408 | { | |
b1f82ccf | 3409 | rtx old, new_offset; |
6f086dfc RS |
3410 | |
3411 | /* Check for (plus (plus VIRT foo) (const_int)) first. */ | |
3412 | if (GET_CODE (XEXP (x, 0)) == PLUS) | |
3413 | { | |
3414 | rtx inner = XEXP (XEXP (x, 0), 0); | |
3415 | ||
3416 | if (inner == virtual_incoming_args_rtx) | |
3417 | new = arg_pointer_rtx, offset = in_arg_offset; | |
3418 | else if (inner == virtual_stack_vars_rtx) | |
3419 | new = frame_pointer_rtx, offset = var_offset; | |
3420 | else if (inner == virtual_stack_dynamic_rtx) | |
3421 | new = stack_pointer_rtx, offset = dynamic_offset; | |
3422 | else if (inner == virtual_outgoing_args_rtx) | |
3423 | new = stack_pointer_rtx, offset = out_arg_offset; | |
71038426 RH |
3424 | else if (inner == virtual_cfa_rtx) |
3425 | new = arg_pointer_rtx, offset = cfa_offset; | |
6f086dfc RS |
3426 | else |
3427 | { | |
3428 | loc = &XEXP (x, 0); | |
3429 | goto restart; | |
3430 | } | |
3431 | ||
3432 | instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 1), object, | |
3433 | extra_insns); | |
38a448ca | 3434 | new = gen_rtx_PLUS (Pmode, new, XEXP (XEXP (x, 0), 1)); |
6f086dfc RS |
3435 | } |
3436 | ||
3437 | else if (XEXP (x, 0) == virtual_incoming_args_rtx) | |
3438 | new = arg_pointer_rtx, offset = in_arg_offset; | |
3439 | else if (XEXP (x, 0) == virtual_stack_vars_rtx) | |
3440 | new = frame_pointer_rtx, offset = var_offset; | |
3441 | else if (XEXP (x, 0) == virtual_stack_dynamic_rtx) | |
3442 | new = stack_pointer_rtx, offset = dynamic_offset; | |
3443 | else if (XEXP (x, 0) == virtual_outgoing_args_rtx) | |
3444 | new = stack_pointer_rtx, offset = out_arg_offset; | |
71038426 RH |
3445 | else if (XEXP (x, 0) == virtual_cfa_rtx) |
3446 | new = arg_pointer_rtx, offset = cfa_offset; | |
6f086dfc RS |
3447 | else |
3448 | { | |
3449 | /* We know the second operand is a constant. Unless the | |
3450 | first operand is a REG (which has been already checked), | |
3451 | it needs to be checked. */ | |
3452 | if (GET_CODE (XEXP (x, 0)) != REG) | |
3453 | { | |
3454 | loc = &XEXP (x, 0); | |
3455 | goto restart; | |
3456 | } | |
3457 | return 1; | |
3458 | } | |
3459 | ||
b1f82ccf | 3460 | new_offset = plus_constant (XEXP (x, 1), offset); |
6f086dfc | 3461 | |
b1f82ccf DE |
3462 | /* If the new constant is zero, try to replace the sum with just |
3463 | the register. */ | |
3464 | if (new_offset == const0_rtx | |
3465 | && validate_change (object, loc, new, 0)) | |
6f086dfc RS |
3466 | return 1; |
3467 | ||
b1f82ccf DE |
3468 | /* Next try to replace the register and new offset. |
3469 | There are two changes to validate here and we can't assume that | |
3470 | in the case of old offset equals new just changing the register | |
3471 | will yield a valid insn. In the interests of a little efficiency, | |
3472 | however, we only call validate change once (we don't queue up the | |
0f41302f | 3473 | changes and then call apply_change_group). */ |
b1f82ccf DE |
3474 | |
3475 | old = XEXP (x, 0); | |
3476 | if (offset == 0 | |
3477 | ? ! validate_change (object, &XEXP (x, 0), new, 0) | |
3478 | : (XEXP (x, 0) = new, | |
3479 | ! validate_change (object, &XEXP (x, 1), new_offset, 0))) | |
6f086dfc RS |
3480 | { |
3481 | if (! extra_insns) | |
3482 | { | |
3483 | XEXP (x, 0) = old; | |
3484 | return 0; | |
3485 | } | |
3486 | ||
3487 | /* Otherwise copy the new constant into a register and replace | |
3488 | constant with that register. */ | |
3489 | temp = gen_reg_rtx (Pmode); | |
b1f82ccf | 3490 | XEXP (x, 0) = new; |
6f086dfc | 3491 | if (validate_change (object, &XEXP (x, 1), temp, 0)) |
b1f82ccf | 3492 | emit_insn_before (gen_move_insn (temp, new_offset), object); |
6f086dfc RS |
3493 | else |
3494 | { | |
3495 | /* If that didn't work, replace this expression with a | |
3496 | register containing the sum. */ | |
3497 | ||
6f086dfc | 3498 | XEXP (x, 0) = old; |
38a448ca | 3499 | new = gen_rtx_PLUS (Pmode, new, new_offset); |
6f086dfc RS |
3500 | |
3501 | start_sequence (); | |
5f4f0e22 | 3502 | temp = force_operand (new, NULL_RTX); |
6f086dfc RS |
3503 | seq = get_insns (); |
3504 | end_sequence (); | |
3505 | ||
3506 | emit_insns_before (seq, object); | |
3507 | if (! validate_change (object, loc, temp, 0) | |
3508 | && ! validate_replace_rtx (x, temp, object)) | |
3509 | abort (); | |
3510 | } | |
3511 | } | |
3512 | ||
3513 | return 1; | |
3514 | } | |
3515 | ||
3516 | /* Fall through to generic two-operand expression case. */ | |
3517 | case EXPR_LIST: | |
3518 | case CALL: | |
3519 | case COMPARE: | |
3520 | case MINUS: | |
3521 | case MULT: | |
3522 | case DIV: case UDIV: | |
3523 | case MOD: case UMOD: | |
3524 | case AND: case IOR: case XOR: | |
45620ed4 RK |
3525 | case ROTATERT: case ROTATE: |
3526 | case ASHIFTRT: case LSHIFTRT: case ASHIFT: | |
6f086dfc RS |
3527 | case NE: case EQ: |
3528 | case GE: case GT: case GEU: case GTU: | |
3529 | case LE: case LT: case LEU: case LTU: | |
3530 | if (XEXP (x, 1) && ! CONSTANT_P (XEXP (x, 1))) | |
3531 | instantiate_virtual_regs_1 (&XEXP (x, 1), object, extra_insns); | |
3532 | loc = &XEXP (x, 0); | |
3533 | goto restart; | |
3534 | ||
3535 | case MEM: | |
3536 | /* Most cases of MEM that convert to valid addresses have already been | |
4fd796bb | 3537 | handled by our scan of decls. The only special handling we |
6f086dfc | 3538 | need here is to make a copy of the rtx to ensure it isn't being |
b335c2cc | 3539 | shared if we have to change it to a pseudo. |
6f086dfc RS |
3540 | |
3541 | If the rtx is a simple reference to an address via a virtual register, | |
3542 | it can potentially be shared. In such cases, first try to make it | |
3543 | a valid address, which can also be shared. Otherwise, copy it and | |
3544 | proceed normally. | |
3545 | ||
3546 | First check for common cases that need no processing. These are | |
3547 | usually due to instantiation already being done on a previous instance | |
3548 | of a shared rtx. */ | |
3549 | ||
3550 | temp = XEXP (x, 0); | |
3551 | if (CONSTANT_ADDRESS_P (temp) | |
3552 | #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM | |
3553 | || temp == arg_pointer_rtx | |
b37f453b DE |
3554 | #endif |
3555 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
3556 | || temp == hard_frame_pointer_rtx | |
6f086dfc RS |
3557 | #endif |
3558 | || temp == frame_pointer_rtx) | |
3559 | return 1; | |
3560 | ||
3561 | if (GET_CODE (temp) == PLUS | |
3562 | && CONSTANT_ADDRESS_P (XEXP (temp, 1)) | |
3563 | && (XEXP (temp, 0) == frame_pointer_rtx | |
b37f453b DE |
3564 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM |
3565 | || XEXP (temp, 0) == hard_frame_pointer_rtx | |
3566 | #endif | |
6f086dfc RS |
3567 | #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM |
3568 | || XEXP (temp, 0) == arg_pointer_rtx | |
3569 | #endif | |
3570 | )) | |
3571 | return 1; | |
3572 | ||
3573 | if (temp == virtual_stack_vars_rtx | |
3574 | || temp == virtual_incoming_args_rtx | |
3575 | || (GET_CODE (temp) == PLUS | |
3576 | && CONSTANT_ADDRESS_P (XEXP (temp, 1)) | |
3577 | && (XEXP (temp, 0) == virtual_stack_vars_rtx | |
3578 | || XEXP (temp, 0) == virtual_incoming_args_rtx))) | |
3579 | { | |
3580 | /* This MEM may be shared. If the substitution can be done without | |
3581 | the need to generate new pseudos, we want to do it in place | |
3582 | so all copies of the shared rtx benefit. The call below will | |
3583 | only make substitutions if the resulting address is still | |
3584 | valid. | |
3585 | ||
3586 | Note that we cannot pass X as the object in the recursive call | |
3587 | since the insn being processed may not allow all valid | |
6461be14 RS |
3588 | addresses. However, if we were not passed on object, we can |
3589 | only modify X without copying it if X will have a valid | |
3590 | address. | |
6f086dfc | 3591 | |
6461be14 RS |
3592 | ??? Also note that this can still lose if OBJECT is an insn that |
3593 | has less restrictions on an address that some other insn. | |
3594 | In that case, we will modify the shared address. This case | |
4fd796bb RK |
3595 | doesn't seem very likely, though. One case where this could |
3596 | happen is in the case of a USE or CLOBBER reference, but we | |
3597 | take care of that below. */ | |
6461be14 RS |
3598 | |
3599 | if (instantiate_virtual_regs_1 (&XEXP (x, 0), | |
3600 | object ? object : x, 0)) | |
6f086dfc RS |
3601 | return 1; |
3602 | ||
3603 | /* Otherwise make a copy and process that copy. We copy the entire | |
3604 | RTL expression since it might be a PLUS which could also be | |
3605 | shared. */ | |
3606 | *loc = x = copy_rtx (x); | |
3607 | } | |
3608 | ||
3609 | /* Fall through to generic unary operation case. */ | |
6f086dfc RS |
3610 | case SUBREG: |
3611 | case STRICT_LOW_PART: | |
3612 | case NEG: case NOT: | |
3613 | case PRE_DEC: case PRE_INC: case POST_DEC: case POST_INC: | |
3614 | case SIGN_EXTEND: case ZERO_EXTEND: | |
3615 | case TRUNCATE: case FLOAT_EXTEND: case FLOAT_TRUNCATE: | |
3616 | case FLOAT: case FIX: | |
3617 | case UNSIGNED_FIX: case UNSIGNED_FLOAT: | |
3618 | case ABS: | |
3619 | case SQRT: | |
3620 | case FFS: | |
3621 | /* These case either have just one operand or we know that we need not | |
3622 | check the rest of the operands. */ | |
3623 | loc = &XEXP (x, 0); | |
3624 | goto restart; | |
3625 | ||
4fd796bb RK |
3626 | case USE: |
3627 | case CLOBBER: | |
3628 | /* If the operand is a MEM, see if the change is a valid MEM. If not, | |
3629 | go ahead and make the invalid one, but do it to a copy. For a REG, | |
3630 | just make the recursive call, since there's no chance of a problem. */ | |
3631 | ||
3632 | if ((GET_CODE (XEXP (x, 0)) == MEM | |
3633 | && instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 0), XEXP (x, 0), | |
3634 | 0)) | |
3635 | || (GET_CODE (XEXP (x, 0)) == REG | |
7694ce35 | 3636 | && instantiate_virtual_regs_1 (&XEXP (x, 0), object, 0))) |
4fd796bb RK |
3637 | return 1; |
3638 | ||
3639 | XEXP (x, 0) = copy_rtx (XEXP (x, 0)); | |
3640 | loc = &XEXP (x, 0); | |
3641 | goto restart; | |
3642 | ||
6f086dfc RS |
3643 | case REG: |
3644 | /* Try to replace with a PLUS. If that doesn't work, compute the sum | |
3645 | in front of this insn and substitute the temporary. */ | |
3646 | if (x == virtual_incoming_args_rtx) | |
3647 | new = arg_pointer_rtx, offset = in_arg_offset; | |
3648 | else if (x == virtual_stack_vars_rtx) | |
3649 | new = frame_pointer_rtx, offset = var_offset; | |
3650 | else if (x == virtual_stack_dynamic_rtx) | |
3651 | new = stack_pointer_rtx, offset = dynamic_offset; | |
3652 | else if (x == virtual_outgoing_args_rtx) | |
3653 | new = stack_pointer_rtx, offset = out_arg_offset; | |
71038426 RH |
3654 | else if (x == virtual_cfa_rtx) |
3655 | new = arg_pointer_rtx, offset = cfa_offset; | |
6f086dfc RS |
3656 | |
3657 | if (new) | |
3658 | { | |
3659 | temp = plus_constant (new, offset); | |
3660 | if (!validate_change (object, loc, temp, 0)) | |
3661 | { | |
3662 | if (! extra_insns) | |
3663 | return 0; | |
3664 | ||
3665 | start_sequence (); | |
5f4f0e22 | 3666 | temp = force_operand (temp, NULL_RTX); |
6f086dfc RS |
3667 | seq = get_insns (); |
3668 | end_sequence (); | |
3669 | ||
3670 | emit_insns_before (seq, object); | |
3671 | if (! validate_change (object, loc, temp, 0) | |
3672 | && ! validate_replace_rtx (x, temp, object)) | |
3673 | abort (); | |
3674 | } | |
3675 | } | |
3676 | ||
3677 | return 1; | |
e9a25f70 JL |
3678 | |
3679 | case ADDRESSOF: | |
3680 | if (GET_CODE (XEXP (x, 0)) == REG) | |
3681 | return 1; | |
3682 | ||
3683 | else if (GET_CODE (XEXP (x, 0)) == MEM) | |
3684 | { | |
3685 | /* If we have a (addressof (mem ..)), do any instantiation inside | |
3686 | since we know we'll be making the inside valid when we finally | |
3687 | remove the ADDRESSOF. */ | |
3688 | instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 0), NULL_RTX, 0); | |
3689 | return 1; | |
3690 | } | |
3691 | break; | |
3692 | ||
3693 | default: | |
3694 | break; | |
6f086dfc RS |
3695 | } |
3696 | ||
3697 | /* Scan all subexpressions. */ | |
3698 | fmt = GET_RTX_FORMAT (code); | |
3699 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
3700 | if (*fmt == 'e') | |
3701 | { | |
3702 | if (!instantiate_virtual_regs_1 (&XEXP (x, i), object, extra_insns)) | |
3703 | return 0; | |
3704 | } | |
3705 | else if (*fmt == 'E') | |
3706 | for (j = 0; j < XVECLEN (x, i); j++) | |
3707 | if (! instantiate_virtual_regs_1 (&XVECEXP (x, i, j), object, | |
3708 | extra_insns)) | |
3709 | return 0; | |
3710 | ||
3711 | return 1; | |
3712 | } | |
3713 | \f | |
3714 | /* Optimization: assuming this function does not receive nonlocal gotos, | |
3715 | delete the handlers for such, as well as the insns to establish | |
3716 | and disestablish them. */ | |
3717 | ||
3718 | static void | |
3719 | delete_handlers () | |
3720 | { | |
3721 | rtx insn; | |
3722 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
3723 | { | |
3724 | /* Delete the handler by turning off the flag that would | |
3725 | prevent jump_optimize from deleting it. | |
3726 | Also permit deletion of the nonlocal labels themselves | |
3727 | if nothing local refers to them. */ | |
3728 | if (GET_CODE (insn) == CODE_LABEL) | |
71cd4a8d JW |
3729 | { |
3730 | tree t, last_t; | |
3731 | ||
3732 | LABEL_PRESERVE_P (insn) = 0; | |
3733 | ||
3734 | /* Remove it from the nonlocal_label list, to avoid confusing | |
3735 | flow. */ | |
3736 | for (t = nonlocal_labels, last_t = 0; t; | |
3737 | last_t = t, t = TREE_CHAIN (t)) | |
3738 | if (DECL_RTL (TREE_VALUE (t)) == insn) | |
3739 | break; | |
3740 | if (t) | |
3741 | { | |
3742 | if (! last_t) | |
3743 | nonlocal_labels = TREE_CHAIN (nonlocal_labels); | |
3744 | else | |
3745 | TREE_CHAIN (last_t) = TREE_CHAIN (t); | |
3746 | } | |
3747 | } | |
ba716ac9 BS |
3748 | if (GET_CODE (insn) == INSN) |
3749 | { | |
3750 | int can_delete = 0; | |
3751 | rtx t; | |
3752 | for (t = nonlocal_goto_handler_slots; t != 0; t = XEXP (t, 1)) | |
3753 | if (reg_mentioned_p (t, PATTERN (insn))) | |
3754 | { | |
3755 | can_delete = 1; | |
3756 | break; | |
3757 | } | |
3758 | if (can_delete | |
59257ff7 RK |
3759 | || (nonlocal_goto_stack_level != 0 |
3760 | && reg_mentioned_p (nonlocal_goto_stack_level, | |
ba716ac9 BS |
3761 | PATTERN (insn)))) |
3762 | delete_insn (insn); | |
3763 | } | |
6f086dfc RS |
3764 | } |
3765 | } | |
6f086dfc RS |
3766 | \f |
3767 | /* Output a USE for any register use in RTL. | |
3768 | This is used with -noreg to mark the extent of lifespan | |
3769 | of any registers used in a user-visible variable's DECL_RTL. */ | |
3770 | ||
3771 | void | |
3772 | use_variable (rtl) | |
3773 | rtx rtl; | |
3774 | { | |
3775 | if (GET_CODE (rtl) == REG) | |
3776 | /* This is a register variable. */ | |
38a448ca | 3777 | emit_insn (gen_rtx_USE (VOIDmode, rtl)); |
6f086dfc RS |
3778 | else if (GET_CODE (rtl) == MEM |
3779 | && GET_CODE (XEXP (rtl, 0)) == REG | |
3780 | && (REGNO (XEXP (rtl, 0)) < FIRST_VIRTUAL_REGISTER | |
3781 | || REGNO (XEXP (rtl, 0)) > LAST_VIRTUAL_REGISTER) | |
3782 | && XEXP (rtl, 0) != current_function_internal_arg_pointer) | |
3783 | /* This is a variable-sized structure. */ | |
38a448ca | 3784 | emit_insn (gen_rtx_USE (VOIDmode, XEXP (rtl, 0))); |
6f086dfc RS |
3785 | } |
3786 | ||
3787 | /* Like use_variable except that it outputs the USEs after INSN | |
3788 | instead of at the end of the insn-chain. */ | |
3789 | ||
3790 | void | |
3791 | use_variable_after (rtl, insn) | |
3792 | rtx rtl, insn; | |
3793 | { | |
3794 | if (GET_CODE (rtl) == REG) | |
3795 | /* This is a register variable. */ | |
38a448ca | 3796 | emit_insn_after (gen_rtx_USE (VOIDmode, rtl), insn); |
6f086dfc RS |
3797 | else if (GET_CODE (rtl) == MEM |
3798 | && GET_CODE (XEXP (rtl, 0)) == REG | |
3799 | && (REGNO (XEXP (rtl, 0)) < FIRST_VIRTUAL_REGISTER | |
3800 | || REGNO (XEXP (rtl, 0)) > LAST_VIRTUAL_REGISTER) | |
3801 | && XEXP (rtl, 0) != current_function_internal_arg_pointer) | |
3802 | /* This is a variable-sized structure. */ | |
38a448ca | 3803 | emit_insn_after (gen_rtx_USE (VOIDmode, XEXP (rtl, 0)), insn); |
6f086dfc RS |
3804 | } |
3805 | \f | |
3806 | int | |
3807 | max_parm_reg_num () | |
3808 | { | |
3809 | return max_parm_reg; | |
3810 | } | |
3811 | ||
3812 | /* Return the first insn following those generated by `assign_parms'. */ | |
3813 | ||
3814 | rtx | |
3815 | get_first_nonparm_insn () | |
3816 | { | |
3817 | if (last_parm_insn) | |
3818 | return NEXT_INSN (last_parm_insn); | |
3819 | return get_insns (); | |
3820 | } | |
3821 | ||
5378192b RS |
3822 | /* Return the first NOTE_INSN_BLOCK_BEG note in the function. |
3823 | Crash if there is none. */ | |
3824 | ||
3825 | rtx | |
3826 | get_first_block_beg () | |
3827 | { | |
3828 | register rtx searcher; | |
3829 | register rtx insn = get_first_nonparm_insn (); | |
3830 | ||
3831 | for (searcher = insn; searcher; searcher = NEXT_INSN (searcher)) | |
3832 | if (GET_CODE (searcher) == NOTE | |
3833 | && NOTE_LINE_NUMBER (searcher) == NOTE_INSN_BLOCK_BEG) | |
3834 | return searcher; | |
3835 | ||
3836 | abort (); /* Invalid call to this function. (See comments above.) */ | |
3837 | return NULL_RTX; | |
3838 | } | |
3839 | ||
d181c154 RS |
3840 | /* Return 1 if EXP is an aggregate type (or a value with aggregate type). |
3841 | This means a type for which function calls must pass an address to the | |
3842 | function or get an address back from the function. | |
3843 | EXP may be a type node or an expression (whose type is tested). */ | |
6f086dfc RS |
3844 | |
3845 | int | |
3846 | aggregate_value_p (exp) | |
3847 | tree exp; | |
3848 | { | |
9d790a4f RS |
3849 | int i, regno, nregs; |
3850 | rtx reg; | |
d181c154 RS |
3851 | tree type; |
3852 | if (TREE_CODE_CLASS (TREE_CODE (exp)) == 't') | |
3853 | type = exp; | |
3854 | else | |
3855 | type = TREE_TYPE (exp); | |
3856 | ||
3857 | if (RETURN_IN_MEMORY (type)) | |
6f086dfc | 3858 | return 1; |
956d6950 | 3859 | /* Types that are TREE_ADDRESSABLE must be constructed in memory, |
49a2e5b2 DE |
3860 | and thus can't be returned in registers. */ |
3861 | if (TREE_ADDRESSABLE (type)) | |
3862 | return 1; | |
05e3bdb9 | 3863 | if (flag_pcc_struct_return && AGGREGATE_TYPE_P (type)) |
6f086dfc | 3864 | return 1; |
9d790a4f RS |
3865 | /* Make sure we have suitable call-clobbered regs to return |
3866 | the value in; if not, we must return it in memory. */ | |
d181c154 | 3867 | reg = hard_function_value (type, 0); |
e71f7aa5 JW |
3868 | |
3869 | /* If we have something other than a REG (e.g. a PARALLEL), then assume | |
3870 | it is OK. */ | |
3871 | if (GET_CODE (reg) != REG) | |
3872 | return 0; | |
3873 | ||
9d790a4f | 3874 | regno = REGNO (reg); |
d181c154 | 3875 | nregs = HARD_REGNO_NREGS (regno, TYPE_MODE (type)); |
9d790a4f RS |
3876 | for (i = 0; i < nregs; i++) |
3877 | if (! call_used_regs[regno + i]) | |
3878 | return 1; | |
6f086dfc RS |
3879 | return 0; |
3880 | } | |
3881 | \f | |
3882 | /* Assign RTL expressions to the function's parameters. | |
3883 | This may involve copying them into registers and using | |
3884 | those registers as the RTL for them. | |
3885 | ||
3886 | If SECOND_TIME is non-zero it means that this function is being | |
3887 | called a second time. This is done by integrate.c when a function's | |
3888 | compilation is deferred. We need to come back here in case the | |
3889 | FUNCTION_ARG macro computes items needed for the rest of the compilation | |
3890 | (such as changing which registers are fixed or caller-saved). But suppress | |
3891 | writing any insns or setting DECL_RTL of anything in this case. */ | |
3892 | ||
3893 | void | |
3894 | assign_parms (fndecl, second_time) | |
3895 | tree fndecl; | |
3896 | int second_time; | |
3897 | { | |
3898 | register tree parm; | |
3899 | register rtx entry_parm = 0; | |
3900 | register rtx stack_parm = 0; | |
3901 | CUMULATIVE_ARGS args_so_far; | |
621061f4 RK |
3902 | enum machine_mode promoted_mode, passed_mode; |
3903 | enum machine_mode nominal_mode, promoted_nominal_mode; | |
00d8a4c1 | 3904 | int unsignedp; |
6f086dfc RS |
3905 | /* Total space needed so far for args on the stack, |
3906 | given as a constant and a tree-expression. */ | |
3907 | struct args_size stack_args_size; | |
3908 | tree fntype = TREE_TYPE (fndecl); | |
3909 | tree fnargs = DECL_ARGUMENTS (fndecl); | |
3910 | /* This is used for the arg pointer when referring to stack args. */ | |
3911 | rtx internal_arg_pointer; | |
3912 | /* This is a dummy PARM_DECL that we used for the function result if | |
3913 | the function returns a structure. */ | |
3914 | tree function_result_decl = 0; | |
54ea1de9 | 3915 | #ifdef SETUP_INCOMING_VARARGS |
6f086dfc | 3916 | int varargs_setup = 0; |
54ea1de9 | 3917 | #endif |
3412b298 | 3918 | rtx conversion_insns = 0; |
6f086dfc RS |
3919 | |
3920 | /* Nonzero if the last arg is named `__builtin_va_alist', | |
3921 | which is used on some machines for old-fashioned non-ANSI varargs.h; | |
3922 | this should be stuck onto the stack as if it had arrived there. */ | |
3b69d50e RK |
3923 | int hide_last_arg |
3924 | = (current_function_varargs | |
3925 | && fnargs | |
6f086dfc RS |
3926 | && (parm = tree_last (fnargs)) != 0 |
3927 | && DECL_NAME (parm) | |
3928 | && (! strcmp (IDENTIFIER_POINTER (DECL_NAME (parm)), | |
3929 | "__builtin_va_alist"))); | |
3930 | ||
3931 | /* Nonzero if function takes extra anonymous args. | |
3932 | This means the last named arg must be on the stack | |
0f41302f | 3933 | right before the anonymous ones. */ |
6f086dfc RS |
3934 | int stdarg |
3935 | = (TYPE_ARG_TYPES (fntype) != 0 | |
3936 | && (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype))) | |
3937 | != void_type_node)); | |
3938 | ||
ebb904cb RK |
3939 | current_function_stdarg = stdarg; |
3940 | ||
6f086dfc RS |
3941 | /* If the reg that the virtual arg pointer will be translated into is |
3942 | not a fixed reg or is the stack pointer, make a copy of the virtual | |
3943 | arg pointer, and address parms via the copy. The frame pointer is | |
3944 | considered fixed even though it is not marked as such. | |
3945 | ||
3946 | The second time through, simply use ap to avoid generating rtx. */ | |
3947 | ||
3948 | if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM | |
3949 | || ! (fixed_regs[ARG_POINTER_REGNUM] | |
3950 | || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)) | |
3951 | && ! second_time) | |
3952 | internal_arg_pointer = copy_to_reg (virtual_incoming_args_rtx); | |
3953 | else | |
3954 | internal_arg_pointer = virtual_incoming_args_rtx; | |
3955 | current_function_internal_arg_pointer = internal_arg_pointer; | |
3956 | ||
3957 | stack_args_size.constant = 0; | |
3958 | stack_args_size.var = 0; | |
3959 | ||
3960 | /* If struct value address is treated as the first argument, make it so. */ | |
3961 | if (aggregate_value_p (DECL_RESULT (fndecl)) | |
3962 | && ! current_function_returns_pcc_struct | |
3963 | && struct_value_incoming_rtx == 0) | |
3964 | { | |
f9f29478 | 3965 | tree type = build_pointer_type (TREE_TYPE (fntype)); |
6f086dfc | 3966 | |
5f4f0e22 | 3967 | function_result_decl = build_decl (PARM_DECL, NULL_TREE, type); |
6f086dfc RS |
3968 | |
3969 | DECL_ARG_TYPE (function_result_decl) = type; | |
3970 | TREE_CHAIN (function_result_decl) = fnargs; | |
3971 | fnargs = function_result_decl; | |
3972 | } | |
3973 | ||
e9a25f70 JL |
3974 | max_parm_reg = LAST_VIRTUAL_REGISTER + 1; |
3975 | parm_reg_stack_loc = (rtx *) savealloc (max_parm_reg * sizeof (rtx)); | |
3976 | bzero ((char *) parm_reg_stack_loc, max_parm_reg * sizeof (rtx)); | |
6f086dfc RS |
3977 | |
3978 | #ifdef INIT_CUMULATIVE_INCOMING_ARGS | |
ea0d4c4b | 3979 | INIT_CUMULATIVE_INCOMING_ARGS (args_so_far, fntype, NULL_RTX); |
6f086dfc | 3980 | #else |
2c7ee1a6 | 3981 | INIT_CUMULATIVE_ARGS (args_so_far, fntype, NULL_RTX, 0); |
6f086dfc RS |
3982 | #endif |
3983 | ||
3984 | /* We haven't yet found an argument that we must push and pretend the | |
3985 | caller did. */ | |
3986 | current_function_pretend_args_size = 0; | |
3987 | ||
3988 | for (parm = fnargs; parm; parm = TREE_CHAIN (parm)) | |
3989 | { | |
05e3bdb9 | 3990 | int aggregate = AGGREGATE_TYPE_P (TREE_TYPE (parm)); |
6f086dfc RS |
3991 | struct args_size stack_offset; |
3992 | struct args_size arg_size; | |
3993 | int passed_pointer = 0; | |
621061f4 | 3994 | int did_conversion = 0; |
6f086dfc | 3995 | tree passed_type = DECL_ARG_TYPE (parm); |
621061f4 | 3996 | tree nominal_type = TREE_TYPE (parm); |
9ab70a9b | 3997 | int pretend_named; |
6f086dfc RS |
3998 | |
3999 | /* Set LAST_NAMED if this is last named arg before some | |
bf9c83fe | 4000 | anonymous args. */ |
6f086dfc RS |
4001 | int last_named = ((TREE_CHAIN (parm) == 0 |
4002 | || DECL_NAME (TREE_CHAIN (parm)) == 0) | |
3b69d50e | 4003 | && (stdarg || current_function_varargs)); |
bf9c83fe JW |
4004 | /* Set NAMED_ARG if this arg should be treated as a named arg. For |
4005 | most machines, if this is a varargs/stdarg function, then we treat | |
4006 | the last named arg as if it were anonymous too. */ | |
e5e809f4 | 4007 | int named_arg = STRICT_ARGUMENT_NAMING ? 1 : ! last_named; |
6f086dfc RS |
4008 | |
4009 | if (TREE_TYPE (parm) == error_mark_node | |
4010 | /* This can happen after weird syntax errors | |
4011 | or if an enum type is defined among the parms. */ | |
4012 | || TREE_CODE (parm) != PARM_DECL | |
4013 | || passed_type == NULL) | |
4014 | { | |
38a448ca RH |
4015 | DECL_INCOMING_RTL (parm) = DECL_RTL (parm) |
4016 | = gen_rtx_MEM (BLKmode, const0_rtx); | |
6f086dfc RS |
4017 | TREE_USED (parm) = 1; |
4018 | continue; | |
4019 | } | |
4020 | ||
4021 | /* For varargs.h function, save info about regs and stack space | |
4022 | used by the individual args, not including the va_alist arg. */ | |
3b69d50e | 4023 | if (hide_last_arg && last_named) |
6f086dfc RS |
4024 | current_function_args_info = args_so_far; |
4025 | ||
4026 | /* Find mode of arg as it is passed, and mode of arg | |
4027 | as it should be during execution of this function. */ | |
4028 | passed_mode = TYPE_MODE (passed_type); | |
621061f4 | 4029 | nominal_mode = TYPE_MODE (nominal_type); |
6f086dfc | 4030 | |
16bae307 RS |
4031 | /* If the parm's mode is VOID, its value doesn't matter, |
4032 | and avoid the usual things like emit_move_insn that could crash. */ | |
4033 | if (nominal_mode == VOIDmode) | |
4034 | { | |
4035 | DECL_INCOMING_RTL (parm) = DECL_RTL (parm) = const0_rtx; | |
4036 | continue; | |
4037 | } | |
4038 | ||
3f46679a RK |
4039 | /* If the parm is to be passed as a transparent union, use the |
4040 | type of the first field for the tests below. We have already | |
4041 | verified that the modes are the same. */ | |
4042 | if (DECL_TRANSPARENT_UNION (parm) | |
4043 | || TYPE_TRANSPARENT_UNION (passed_type)) | |
4044 | passed_type = TREE_TYPE (TYPE_FIELDS (passed_type)); | |
4045 | ||
a14ae508 RK |
4046 | /* See if this arg was passed by invisible reference. It is if |
4047 | it is an object whose size depends on the contents of the | |
4048 | object itself or if the machine requires these objects be passed | |
4049 | that way. */ | |
4050 | ||
4051 | if ((TREE_CODE (TYPE_SIZE (passed_type)) != INTEGER_CST | |
4052 | && contains_placeholder_p (TYPE_SIZE (passed_type))) | |
657bb6dc | 4053 | || TREE_ADDRESSABLE (passed_type) |
6f086dfc | 4054 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE |
a14ae508 | 4055 | || FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, passed_mode, |
bf9c83fe | 4056 | passed_type, named_arg) |
a14ae508 RK |
4057 | #endif |
4058 | ) | |
6f086dfc | 4059 | { |
621061f4 | 4060 | passed_type = nominal_type = build_pointer_type (passed_type); |
6f086dfc RS |
4061 | passed_pointer = 1; |
4062 | passed_mode = nominal_mode = Pmode; | |
4063 | } | |
6f086dfc | 4064 | |
a53e14c0 RK |
4065 | promoted_mode = passed_mode; |
4066 | ||
4067 | #ifdef PROMOTE_FUNCTION_ARGS | |
4068 | /* Compute the mode in which the arg is actually extended to. */ | |
7940255d | 4069 | unsignedp = TREE_UNSIGNED (passed_type); |
a5a52dbc | 4070 | promoted_mode = promote_mode (passed_type, promoted_mode, &unsignedp, 1); |
a53e14c0 RK |
4071 | #endif |
4072 | ||
6f086dfc RS |
4073 | /* Let machine desc say which reg (if any) the parm arrives in. |
4074 | 0 means it arrives on the stack. */ | |
4075 | #ifdef FUNCTION_INCOMING_ARG | |
a53e14c0 | 4076 | entry_parm = FUNCTION_INCOMING_ARG (args_so_far, promoted_mode, |
bf9c83fe | 4077 | passed_type, named_arg); |
6f086dfc | 4078 | #else |
a53e14c0 | 4079 | entry_parm = FUNCTION_ARG (args_so_far, promoted_mode, |
bf9c83fe | 4080 | passed_type, named_arg); |
6f086dfc RS |
4081 | #endif |
4082 | ||
621061f4 RK |
4083 | if (entry_parm == 0) |
4084 | promoted_mode = passed_mode; | |
a53e14c0 | 4085 | |
6f086dfc RS |
4086 | #ifdef SETUP_INCOMING_VARARGS |
4087 | /* If this is the last named parameter, do any required setup for | |
4088 | varargs or stdargs. We need to know about the case of this being an | |
4089 | addressable type, in which case we skip the registers it | |
4090 | would have arrived in. | |
4091 | ||
4092 | For stdargs, LAST_NAMED will be set for two parameters, the one that | |
4093 | is actually the last named, and the dummy parameter. We only | |
4094 | want to do this action once. | |
4095 | ||
4096 | Also, indicate when RTL generation is to be suppressed. */ | |
4097 | if (last_named && !varargs_setup) | |
4098 | { | |
621061f4 | 4099 | SETUP_INCOMING_VARARGS (args_so_far, promoted_mode, passed_type, |
6f086dfc RS |
4100 | current_function_pretend_args_size, |
4101 | second_time); | |
4102 | varargs_setup = 1; | |
4103 | } | |
4104 | #endif | |
4105 | ||
4106 | /* Determine parm's home in the stack, | |
4107 | in case it arrives in the stack or we should pretend it did. | |
4108 | ||
4109 | Compute the stack position and rtx where the argument arrives | |
4110 | and its size. | |
4111 | ||
4112 | There is one complexity here: If this was a parameter that would | |
4113 | have been passed in registers, but wasn't only because it is | |
4114 | __builtin_va_alist, we want locate_and_pad_parm to treat it as if | |
4115 | it came in a register so that REG_PARM_STACK_SPACE isn't skipped. | |
4116 | In this case, we call FUNCTION_ARG with NAMED set to 1 instead of | |
4117 | 0 as it was the previous time. */ | |
4118 | ||
9ab70a9b | 4119 | pretend_named = named_arg || PRETEND_OUTGOING_VARARGS_NAMED; |
0f11903b | 4120 | locate_and_pad_parm (promoted_mode, passed_type, |
6f086dfc RS |
4121 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
4122 | 1, | |
4123 | #else | |
4124 | #ifdef FUNCTION_INCOMING_ARG | |
621061f4 | 4125 | FUNCTION_INCOMING_ARG (args_so_far, promoted_mode, |
6f086dfc | 4126 | passed_type, |
9ab70a9b | 4127 | pretend_named) != 0, |
6f086dfc | 4128 | #else |
621061f4 | 4129 | FUNCTION_ARG (args_so_far, promoted_mode, |
6f086dfc | 4130 | passed_type, |
9ab70a9b | 4131 | pretend_named) != 0, |
6f086dfc RS |
4132 | #endif |
4133 | #endif | |
4134 | fndecl, &stack_args_size, &stack_offset, &arg_size); | |
4135 | ||
4136 | if (! second_time) | |
4137 | { | |
4138 | rtx offset_rtx = ARGS_SIZE_RTX (stack_offset); | |
4139 | ||
4140 | if (offset_rtx == const0_rtx) | |
0f11903b | 4141 | stack_parm = gen_rtx_MEM (promoted_mode, internal_arg_pointer); |
6f086dfc | 4142 | else |
0f11903b | 4143 | stack_parm = gen_rtx_MEM (promoted_mode, |
38a448ca RH |
4144 | gen_rtx_PLUS (Pmode, |
4145 | internal_arg_pointer, | |
4146 | offset_rtx)); | |
6f086dfc RS |
4147 | |
4148 | /* If this is a memory ref that contains aggregate components, | |
a00285d0 RK |
4149 | mark it as such for cse and loop optimize. Likewise if it |
4150 | is readonly. */ | |
c6df88cb | 4151 | MEM_SET_IN_STRUCT_P (stack_parm, aggregate); |
a00285d0 | 4152 | RTX_UNCHANGING_P (stack_parm) = TREE_READONLY (parm); |
41472af8 | 4153 | MEM_ALIAS_SET (stack_parm) = get_alias_set (parm); |
6f086dfc RS |
4154 | } |
4155 | ||
4156 | /* If this parameter was passed both in registers and in the stack, | |
4157 | use the copy on the stack. */ | |
621061f4 | 4158 | if (MUST_PASS_IN_STACK (promoted_mode, passed_type)) |
6f086dfc RS |
4159 | entry_parm = 0; |
4160 | ||
461beb10 | 4161 | #ifdef FUNCTION_ARG_PARTIAL_NREGS |
6f086dfc RS |
4162 | /* If this parm was passed part in regs and part in memory, |
4163 | pretend it arrived entirely in memory | |
4164 | by pushing the register-part onto the stack. | |
4165 | ||
4166 | In the special case of a DImode or DFmode that is split, | |
4167 | we could put it together in a pseudoreg directly, | |
4168 | but for now that's not worth bothering with. */ | |
4169 | ||
4170 | if (entry_parm) | |
4171 | { | |
621061f4 | 4172 | int nregs = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, promoted_mode, |
bf9c83fe | 4173 | passed_type, named_arg); |
6f086dfc RS |
4174 | |
4175 | if (nregs > 0) | |
4176 | { | |
4177 | current_function_pretend_args_size | |
4178 | = (((nregs * UNITS_PER_WORD) + (PARM_BOUNDARY / BITS_PER_UNIT) - 1) | |
4179 | / (PARM_BOUNDARY / BITS_PER_UNIT) | |
4180 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
4181 | ||
4182 | if (! second_time) | |
5c4cdc9f JW |
4183 | { |
4184 | /* Handle calls that pass values in multiple non-contiguous | |
4185 | locations. The Irix 6 ABI has examples of this. */ | |
4186 | if (GET_CODE (entry_parm) == PARALLEL) | |
aac5cc16 RH |
4187 | emit_group_store (validize_mem (stack_parm), entry_parm, |
4188 | int_size_in_bytes (TREE_TYPE (parm)), | |
4189 | (TYPE_ALIGN (TREE_TYPE (parm)) | |
4190 | / BITS_PER_UNIT)); | |
5c4cdc9f JW |
4191 | else |
4192 | move_block_from_reg (REGNO (entry_parm), | |
4193 | validize_mem (stack_parm), nregs, | |
4194 | int_size_in_bytes (TREE_TYPE (parm))); | |
4195 | } | |
6f086dfc RS |
4196 | entry_parm = stack_parm; |
4197 | } | |
4198 | } | |
461beb10 | 4199 | #endif |
6f086dfc RS |
4200 | |
4201 | /* If we didn't decide this parm came in a register, | |
4202 | by default it came on the stack. */ | |
4203 | if (entry_parm == 0) | |
4204 | entry_parm = stack_parm; | |
4205 | ||
4206 | /* Record permanently how this parm was passed. */ | |
4207 | if (! second_time) | |
4208 | DECL_INCOMING_RTL (parm) = entry_parm; | |
4209 | ||
4210 | /* If there is actually space on the stack for this parm, | |
4211 | count it in stack_args_size; otherwise set stack_parm to 0 | |
4212 | to indicate there is no preallocated stack slot for the parm. */ | |
4213 | ||
4214 | if (entry_parm == stack_parm | |
ab87f8c8 JL |
4215 | || (GET_CODE (entry_parm) == PARALLEL |
4216 | && XEXP (XVECEXP (entry_parm, 0, 0), 0) == NULL_RTX) | |
d9ca49d5 | 4217 | #if defined (REG_PARM_STACK_SPACE) && ! defined (MAYBE_REG_PARM_STACK_SPACE) |
6f086dfc | 4218 | /* On some machines, even if a parm value arrives in a register |
d9ca49d5 JW |
4219 | there is still an (uninitialized) stack slot allocated for it. |
4220 | ||
4221 | ??? When MAYBE_REG_PARM_STACK_SPACE is defined, we can't tell | |
4222 | whether this parameter already has a stack slot allocated, | |
4223 | because an arg block exists only if current_function_args_size | |
abc95ed3 | 4224 | is larger than some threshold, and we haven't calculated that |
d9ca49d5 JW |
4225 | yet. So, for now, we just assume that stack slots never exist |
4226 | in this case. */ | |
6f086dfc RS |
4227 | || REG_PARM_STACK_SPACE (fndecl) > 0 |
4228 | #endif | |
4229 | ) | |
4230 | { | |
4231 | stack_args_size.constant += arg_size.constant; | |
4232 | if (arg_size.var) | |
4233 | ADD_PARM_SIZE (stack_args_size, arg_size.var); | |
4234 | } | |
4235 | else | |
4236 | /* No stack slot was pushed for this parm. */ | |
4237 | stack_parm = 0; | |
4238 | ||
4239 | /* Update info on where next arg arrives in registers. */ | |
4240 | ||
621061f4 | 4241 | FUNCTION_ARG_ADVANCE (args_so_far, promoted_mode, |
bf9c83fe | 4242 | passed_type, named_arg); |
6f086dfc | 4243 | |
0f41302f | 4244 | /* If this is our second time through, we are done with this parm. */ |
6f086dfc RS |
4245 | if (second_time) |
4246 | continue; | |
4247 | ||
e16c591a RS |
4248 | /* If we can't trust the parm stack slot to be aligned enough |
4249 | for its ultimate type, don't use that slot after entry. | |
4250 | We'll make another stack slot, if we need one. */ | |
4251 | { | |
e16c591a | 4252 | int thisparm_boundary |
621061f4 | 4253 | = FUNCTION_ARG_BOUNDARY (promoted_mode, passed_type); |
e16c591a RS |
4254 | |
4255 | if (GET_MODE_ALIGNMENT (nominal_mode) > thisparm_boundary) | |
4256 | stack_parm = 0; | |
4257 | } | |
4258 | ||
cb61f66f RS |
4259 | /* If parm was passed in memory, and we need to convert it on entry, |
4260 | don't store it back in that same slot. */ | |
4261 | if (entry_parm != 0 | |
4262 | && nominal_mode != BLKmode && nominal_mode != passed_mode) | |
4263 | stack_parm = 0; | |
4264 | ||
4265 | #if 0 | |
6f086dfc RS |
4266 | /* Now adjust STACK_PARM to the mode and precise location |
4267 | where this parameter should live during execution, | |
4268 | if we discover that it must live in the stack during execution. | |
4269 | To make debuggers happier on big-endian machines, we store | |
4270 | the value in the last bytes of the space available. */ | |
4271 | ||
4272 | if (nominal_mode != BLKmode && nominal_mode != passed_mode | |
4273 | && stack_parm != 0) | |
4274 | { | |
4275 | rtx offset_rtx; | |
4276 | ||
f76b9db2 ILT |
4277 | if (BYTES_BIG_ENDIAN |
4278 | && GET_MODE_SIZE (nominal_mode) < UNITS_PER_WORD) | |
6f086dfc RS |
4279 | stack_offset.constant += (GET_MODE_SIZE (passed_mode) |
4280 | - GET_MODE_SIZE (nominal_mode)); | |
6f086dfc RS |
4281 | |
4282 | offset_rtx = ARGS_SIZE_RTX (stack_offset); | |
4283 | if (offset_rtx == const0_rtx) | |
38a448ca | 4284 | stack_parm = gen_rtx_MEM (nominal_mode, internal_arg_pointer); |
6f086dfc | 4285 | else |
38a448ca RH |
4286 | stack_parm = gen_rtx_MEM (nominal_mode, |
4287 | gen_rtx_PLUS (Pmode, | |
4288 | internal_arg_pointer, | |
4289 | offset_rtx)); | |
6f086dfc RS |
4290 | |
4291 | /* If this is a memory ref that contains aggregate components, | |
4292 | mark it as such for cse and loop optimize. */ | |
c6df88cb | 4293 | MEM_SET_IN_STRUCT_P (stack_parm, aggregate); |
6f086dfc | 4294 | } |
cb61f66f | 4295 | #endif /* 0 */ |
6f086dfc | 4296 | |
9dc0f531 RK |
4297 | #ifdef STACK_REGS |
4298 | /* We need this "use" info, because the gcc-register->stack-register | |
4299 | converter in reg-stack.c needs to know which registers are active | |
4300 | at the start of the function call. The actual parameter loading | |
4301 | instructions are not always available then anymore, since they might | |
4302 | have been optimised away. */ | |
4303 | ||
4304 | if (GET_CODE (entry_parm) == REG && !(hide_last_arg && last_named)) | |
38a448ca | 4305 | emit_insn (gen_rtx_USE (GET_MODE (entry_parm), entry_parm)); |
9dc0f531 RK |
4306 | #endif |
4307 | ||
6f086dfc RS |
4308 | /* ENTRY_PARM is an RTX for the parameter as it arrives, |
4309 | in the mode in which it arrives. | |
4310 | STACK_PARM is an RTX for a stack slot where the parameter can live | |
4311 | during the function (in case we want to put it there). | |
4312 | STACK_PARM is 0 if no stack slot was pushed for it. | |
4313 | ||
4314 | Now output code if necessary to convert ENTRY_PARM to | |
4315 | the type in which this function declares it, | |
4316 | and store that result in an appropriate place, | |
4317 | which may be a pseudo reg, may be STACK_PARM, | |
4318 | or may be a local stack slot if STACK_PARM is 0. | |
4319 | ||
4320 | Set DECL_RTL to that place. */ | |
4321 | ||
5c4cdc9f | 4322 | if (nominal_mode == BLKmode || GET_CODE (entry_parm) == PARALLEL) |
6f086dfc | 4323 | { |
5c4cdc9f JW |
4324 | /* If a BLKmode arrives in registers, copy it to a stack slot. |
4325 | Handle calls that pass values in multiple non-contiguous | |
4326 | locations. The Irix 6 ABI has examples of this. */ | |
4327 | if (GET_CODE (entry_parm) == REG | |
4328 | || GET_CODE (entry_parm) == PARALLEL) | |
6f086dfc | 4329 | { |
621061f4 RK |
4330 | int size_stored |
4331 | = CEIL_ROUND (int_size_in_bytes (TREE_TYPE (parm)), | |
4332 | UNITS_PER_WORD); | |
6f086dfc RS |
4333 | |
4334 | /* Note that we will be storing an integral number of words. | |
4335 | So we have to be careful to ensure that we allocate an | |
4336 | integral number of words. We do this below in the | |
4337 | assign_stack_local if space was not allocated in the argument | |
4338 | list. If it was, this will not work if PARM_BOUNDARY is not | |
4339 | a multiple of BITS_PER_WORD. It isn't clear how to fix this | |
4340 | if it becomes a problem. */ | |
4341 | ||
4342 | if (stack_parm == 0) | |
7e41ffa2 RS |
4343 | { |
4344 | stack_parm | |
621061f4 RK |
4345 | = assign_stack_local (GET_MODE (entry_parm), |
4346 | size_stored, 0); | |
4347 | ||
4348 | /* If this is a memory ref that contains aggregate | |
4349 | components, mark it as such for cse and loop optimize. */ | |
c6df88cb | 4350 | MEM_SET_IN_STRUCT_P (stack_parm, aggregate); |
7e41ffa2 RS |
4351 | } |
4352 | ||
6f086dfc RS |
4353 | else if (PARM_BOUNDARY % BITS_PER_WORD != 0) |
4354 | abort (); | |
4355 | ||
7a30f0c4 JW |
4356 | if (TREE_READONLY (parm)) |
4357 | RTX_UNCHANGING_P (stack_parm) = 1; | |
4358 | ||
5c4cdc9f JW |
4359 | /* Handle calls that pass values in multiple non-contiguous |
4360 | locations. The Irix 6 ABI has examples of this. */ | |
4361 | if (GET_CODE (entry_parm) == PARALLEL) | |
aac5cc16 RH |
4362 | emit_group_store (validize_mem (stack_parm), entry_parm, |
4363 | int_size_in_bytes (TREE_TYPE (parm)), | |
4364 | (TYPE_ALIGN (TREE_TYPE (parm)) | |
4365 | / BITS_PER_UNIT)); | |
5c4cdc9f JW |
4366 | else |
4367 | move_block_from_reg (REGNO (entry_parm), | |
4368 | validize_mem (stack_parm), | |
4369 | size_stored / UNITS_PER_WORD, | |
4370 | int_size_in_bytes (TREE_TYPE (parm))); | |
6f086dfc RS |
4371 | } |
4372 | DECL_RTL (parm) = stack_parm; | |
4373 | } | |
74bd77a8 | 4374 | else if (! ((obey_regdecls && ! DECL_REGISTER (parm) |
a82ad570 | 4375 | && ! DECL_INLINE (fndecl)) |
6f086dfc RS |
4376 | /* layout_decl may set this. */ |
4377 | || TREE_ADDRESSABLE (parm) | |
4378 | || TREE_SIDE_EFFECTS (parm) | |
4379 | /* If -ffloat-store specified, don't put explicit | |
4380 | float variables into registers. */ | |
4381 | || (flag_float_store | |
4382 | && TREE_CODE (TREE_TYPE (parm)) == REAL_TYPE)) | |
4383 | /* Always assign pseudo to structure return or item passed | |
4384 | by invisible reference. */ | |
4385 | || passed_pointer || parm == function_result_decl) | |
4386 | { | |
00d8a4c1 RK |
4387 | /* Store the parm in a pseudoregister during the function, but we |
4388 | may need to do it in a wider mode. */ | |
4389 | ||
4390 | register rtx parmreg; | |
4e86caed | 4391 | int regno, regnoi = 0, regnor = 0; |
00d8a4c1 RK |
4392 | |
4393 | unsignedp = TREE_UNSIGNED (TREE_TYPE (parm)); | |
cd5b3469 | 4394 | |
621061f4 RK |
4395 | promoted_nominal_mode |
4396 | = promote_mode (TREE_TYPE (parm), nominal_mode, &unsignedp, 0); | |
6f086dfc | 4397 | |
621061f4 | 4398 | parmreg = gen_reg_rtx (promoted_nominal_mode); |
ddb7361a | 4399 | mark_user_reg (parmreg); |
6f086dfc RS |
4400 | |
4401 | /* If this was an item that we received a pointer to, set DECL_RTL | |
4402 | appropriately. */ | |
4403 | if (passed_pointer) | |
4404 | { | |
621061f4 | 4405 | DECL_RTL (parm) |
38a448ca | 4406 | = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (passed_type)), parmreg); |
c6df88cb | 4407 | MEM_SET_IN_STRUCT_P (DECL_RTL (parm), aggregate); |
6f086dfc RS |
4408 | } |
4409 | else | |
4410 | DECL_RTL (parm) = parmreg; | |
4411 | ||
4412 | /* Copy the value into the register. */ | |
621061f4 RK |
4413 | if (nominal_mode != passed_mode |
4414 | || promoted_nominal_mode != promoted_mode) | |
86f8eff3 | 4415 | { |
efd8cba0 | 4416 | int save_tree_used; |
621061f4 RK |
4417 | /* ENTRY_PARM has been converted to PROMOTED_MODE, its |
4418 | mode, by the caller. We now have to convert it to | |
4419 | NOMINAL_MODE, if different. However, PARMREG may be in | |
956d6950 | 4420 | a different mode than NOMINAL_MODE if it is being stored |
621061f4 RK |
4421 | promoted. |
4422 | ||
4423 | If ENTRY_PARM is a hard register, it might be in a register | |
86f8eff3 RK |
4424 | not valid for operating in its mode (e.g., an odd-numbered |
4425 | register for a DFmode). In that case, moves are the only | |
4426 | thing valid, so we can't do a convert from there. This | |
4427 | occurs when the calling sequence allow such misaligned | |
3412b298 JW |
4428 | usages. |
4429 | ||
4430 | In addition, the conversion may involve a call, which could | |
4431 | clobber parameters which haven't been copied to pseudo | |
4432 | registers yet. Therefore, we must first copy the parm to | |
4433 | a pseudo reg here, and save the conversion until after all | |
4434 | parameters have been moved. */ | |
4435 | ||
4436 | rtx tempreg = gen_reg_rtx (GET_MODE (entry_parm)); | |
4437 | ||
4438 | emit_move_insn (tempreg, validize_mem (entry_parm)); | |
4439 | ||
4440 | push_to_sequence (conversion_insns); | |
ad241351 RK |
4441 | tempreg = convert_to_mode (nominal_mode, tempreg, unsignedp); |
4442 | ||
efd8cba0 DB |
4443 | /* TREE_USED gets set erroneously during expand_assignment. */ |
4444 | save_tree_used = TREE_USED (parm); | |
621061f4 RK |
4445 | expand_assignment (parm, |
4446 | make_tree (nominal_type, tempreg), 0, 0); | |
efd8cba0 | 4447 | TREE_USED (parm) = save_tree_used; |
3412b298 | 4448 | conversion_insns = get_insns (); |
621061f4 | 4449 | did_conversion = 1; |
3412b298 | 4450 | end_sequence (); |
86f8eff3 | 4451 | } |
6f086dfc RS |
4452 | else |
4453 | emit_move_insn (parmreg, validize_mem (entry_parm)); | |
4454 | ||
74bd77a8 RS |
4455 | /* If we were passed a pointer but the actual value |
4456 | can safely live in a register, put it in one. */ | |
16bae307 | 4457 | if (passed_pointer && TYPE_MODE (TREE_TYPE (parm)) != BLKmode |
74bd77a8 RS |
4458 | && ! ((obey_regdecls && ! DECL_REGISTER (parm) |
4459 | && ! DECL_INLINE (fndecl)) | |
4460 | /* layout_decl may set this. */ | |
4461 | || TREE_ADDRESSABLE (parm) | |
4462 | || TREE_SIDE_EFFECTS (parm) | |
4463 | /* If -ffloat-store specified, don't put explicit | |
4464 | float variables into registers. */ | |
4465 | || (flag_float_store | |
4466 | && TREE_CODE (TREE_TYPE (parm)) == REAL_TYPE))) | |
4467 | { | |
2654605a JW |
4468 | /* We can't use nominal_mode, because it will have been set to |
4469 | Pmode above. We must use the actual mode of the parm. */ | |
4470 | parmreg = gen_reg_rtx (TYPE_MODE (TREE_TYPE (parm))); | |
ddb7361a | 4471 | mark_user_reg (parmreg); |
74bd77a8 RS |
4472 | emit_move_insn (parmreg, DECL_RTL (parm)); |
4473 | DECL_RTL (parm) = parmreg; | |
c110c53d RS |
4474 | /* STACK_PARM is the pointer, not the parm, and PARMREG is |
4475 | now the parm. */ | |
4476 | stack_parm = 0; | |
74bd77a8 | 4477 | } |
137a2a7b DE |
4478 | #ifdef FUNCTION_ARG_CALLEE_COPIES |
4479 | /* If we are passed an arg by reference and it is our responsibility | |
4480 | to make a copy, do it now. | |
4481 | PASSED_TYPE and PASSED mode now refer to the pointer, not the | |
4482 | original argument, so we must recreate them in the call to | |
4483 | FUNCTION_ARG_CALLEE_COPIES. */ | |
4484 | /* ??? Later add code to handle the case that if the argument isn't | |
4485 | modified, don't do the copy. */ | |
4486 | ||
4487 | else if (passed_pointer | |
4488 | && FUNCTION_ARG_CALLEE_COPIES (args_so_far, | |
4489 | TYPE_MODE (DECL_ARG_TYPE (parm)), | |
4490 | DECL_ARG_TYPE (parm), | |
bf9c83fe | 4491 | named_arg) |
926b1b99 | 4492 | && ! TREE_ADDRESSABLE (DECL_ARG_TYPE (parm))) |
137a2a7b DE |
4493 | { |
4494 | rtx copy; | |
4495 | tree type = DECL_ARG_TYPE (parm); | |
4496 | ||
4497 | /* This sequence may involve a library call perhaps clobbering | |
4498 | registers that haven't been copied to pseudos yet. */ | |
4499 | ||
4500 | push_to_sequence (conversion_insns); | |
4501 | ||
4502 | if (TYPE_SIZE (type) == 0 | |
4503 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
1fd3ef7f | 4504 | /* This is a variable sized object. */ |
38a448ca RH |
4505 | copy = gen_rtx_MEM (BLKmode, |
4506 | allocate_dynamic_stack_space | |
4507 | (expr_size (parm), NULL_RTX, | |
4508 | TYPE_ALIGN (type))); | |
137a2a7b | 4509 | else |
1fd3ef7f RK |
4510 | copy = assign_stack_temp (TYPE_MODE (type), |
4511 | int_size_in_bytes (type), 1); | |
c6df88cb | 4512 | MEM_SET_IN_STRUCT_P (copy, AGGREGATE_TYPE_P (type)); |
e9a25f70 | 4513 | RTX_UNCHANGING_P (copy) = TREE_READONLY (parm); |
137a2a7b DE |
4514 | |
4515 | store_expr (parm, copy, 0); | |
4516 | emit_move_insn (parmreg, XEXP (copy, 0)); | |
7d384cc0 | 4517 | if (current_function_check_memory_usage) |
86fa911a | 4518 | emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3, |
6a9c4aed | 4519 | XEXP (copy, 0), Pmode, |
86fa911a RK |
4520 | GEN_INT (int_size_in_bytes (type)), |
4521 | TYPE_MODE (sizetype), | |
956d6950 JL |
4522 | GEN_INT (MEMORY_USE_RW), |
4523 | TYPE_MODE (integer_type_node)); | |
137a2a7b | 4524 | conversion_insns = get_insns (); |
621061f4 | 4525 | did_conversion = 1; |
137a2a7b DE |
4526 | end_sequence (); |
4527 | } | |
4528 | #endif /* FUNCTION_ARG_CALLEE_COPIES */ | |
74bd77a8 | 4529 | |
6f086dfc | 4530 | /* In any case, record the parm's desired stack location |
14aceb29 RS |
4531 | in case we later discover it must live in the stack. |
4532 | ||
4533 | If it is a COMPLEX value, store the stack location for both | |
4534 | halves. */ | |
4535 | ||
4536 | if (GET_CODE (parmreg) == CONCAT) | |
4537 | regno = MAX (REGNO (XEXP (parmreg, 0)), REGNO (XEXP (parmreg, 1))); | |
4538 | else | |
4539 | regno = REGNO (parmreg); | |
4540 | ||
e9a25f70 | 4541 | if (regno >= max_parm_reg) |
6f086dfc RS |
4542 | { |
4543 | rtx *new; | |
e9a25f70 | 4544 | int old_max_parm_reg = max_parm_reg; |
14aceb29 | 4545 | |
e9a25f70 JL |
4546 | /* It's slow to expand this one register at a time, |
4547 | but it's also rare and we need max_parm_reg to be | |
4548 | precisely correct. */ | |
4549 | max_parm_reg = regno + 1; | |
4550 | new = (rtx *) savealloc (max_parm_reg * sizeof (rtx)); | |
4c9a05bc | 4551 | bcopy ((char *) parm_reg_stack_loc, (char *) new, |
e9a25f70 JL |
4552 | old_max_parm_reg * sizeof (rtx)); |
4553 | bzero ((char *) (new + old_max_parm_reg), | |
4554 | (max_parm_reg - old_max_parm_reg) * sizeof (rtx)); | |
6f086dfc RS |
4555 | parm_reg_stack_loc = new; |
4556 | } | |
14aceb29 RS |
4557 | |
4558 | if (GET_CODE (parmreg) == CONCAT) | |
4559 | { | |
4560 | enum machine_mode submode = GET_MODE (XEXP (parmreg, 0)); | |
4561 | ||
a03caf76 RK |
4562 | regnor = REGNO (gen_realpart (submode, parmreg)); |
4563 | regnoi = REGNO (gen_imagpart (submode, parmreg)); | |
4564 | ||
7b1a0c14 RS |
4565 | if (stack_parm != 0) |
4566 | { | |
a03caf76 | 4567 | parm_reg_stack_loc[regnor] |
3d329b07 | 4568 | = gen_realpart (submode, stack_parm); |
a03caf76 | 4569 | parm_reg_stack_loc[regnoi] |
3d329b07 | 4570 | = gen_imagpart (submode, stack_parm); |
7b1a0c14 RS |
4571 | } |
4572 | else | |
4573 | { | |
a03caf76 RK |
4574 | parm_reg_stack_loc[regnor] = 0; |
4575 | parm_reg_stack_loc[regnoi] = 0; | |
7b1a0c14 | 4576 | } |
14aceb29 RS |
4577 | } |
4578 | else | |
4579 | parm_reg_stack_loc[REGNO (parmreg)] = stack_parm; | |
6f086dfc RS |
4580 | |
4581 | /* Mark the register as eliminable if we did no conversion | |
4582 | and it was copied from memory at a fixed offset, | |
4583 | and the arg pointer was not copied to a pseudo-reg. | |
4584 | If the arg pointer is a pseudo reg or the offset formed | |
4585 | an invalid address, such memory-equivalences | |
4586 | as we make here would screw up life analysis for it. */ | |
4587 | if (nominal_mode == passed_mode | |
621061f4 | 4588 | && ! did_conversion |
38b610ed ILT |
4589 | && stack_parm != 0 |
4590 | && GET_CODE (stack_parm) == MEM | |
6f086dfc RS |
4591 | && stack_offset.var == 0 |
4592 | && reg_mentioned_p (virtual_incoming_args_rtx, | |
38b610ed | 4593 | XEXP (stack_parm, 0))) |
a03caf76 RK |
4594 | { |
4595 | rtx linsn = get_last_insn (); | |
69685820 | 4596 | rtx sinsn, set; |
a03caf76 RK |
4597 | |
4598 | /* Mark complex types separately. */ | |
4599 | if (GET_CODE (parmreg) == CONCAT) | |
69685820 RK |
4600 | /* Scan backwards for the set of the real and |
4601 | imaginary parts. */ | |
4602 | for (sinsn = linsn; sinsn != 0; | |
4603 | sinsn = prev_nonnote_insn (sinsn)) | |
4604 | { | |
4605 | set = single_set (sinsn); | |
4606 | if (set != 0 | |
4607 | && SET_DEST (set) == regno_reg_rtx [regnoi]) | |
4608 | REG_NOTES (sinsn) | |
38a448ca RH |
4609 | = gen_rtx_EXPR_LIST (REG_EQUIV, |
4610 | parm_reg_stack_loc[regnoi], | |
4611 | REG_NOTES (sinsn)); | |
69685820 RK |
4612 | else if (set != 0 |
4613 | && SET_DEST (set) == regno_reg_rtx [regnor]) | |
4614 | REG_NOTES (sinsn) | |
38a448ca RH |
4615 | = gen_rtx_EXPR_LIST (REG_EQUIV, |
4616 | parm_reg_stack_loc[regnor], | |
4617 | REG_NOTES (sinsn)); | |
69685820 RK |
4618 | } |
4619 | else if ((set = single_set (linsn)) != 0 | |
4620 | && SET_DEST (set) == parmreg) | |
a03caf76 | 4621 | REG_NOTES (linsn) |
38a448ca RH |
4622 | = gen_rtx_EXPR_LIST (REG_EQUIV, |
4623 | stack_parm, REG_NOTES (linsn)); | |
a03caf76 | 4624 | } |
6f086dfc RS |
4625 | |
4626 | /* For pointer data type, suggest pointer register. */ | |
e5e809f4 | 4627 | if (POINTER_TYPE_P (TREE_TYPE (parm))) |
6c6166bd RK |
4628 | mark_reg_pointer (parmreg, |
4629 | (TYPE_ALIGN (TREE_TYPE (TREE_TYPE (parm))) | |
4630 | / BITS_PER_UNIT)); | |
6f086dfc RS |
4631 | } |
4632 | else | |
4633 | { | |
4634 | /* Value must be stored in the stack slot STACK_PARM | |
4635 | during function execution. */ | |
4636 | ||
621061f4 | 4637 | if (promoted_mode != nominal_mode) |
86f8eff3 RK |
4638 | { |
4639 | /* Conversion is required. */ | |
3412b298 JW |
4640 | rtx tempreg = gen_reg_rtx (GET_MODE (entry_parm)); |
4641 | ||
4642 | emit_move_insn (tempreg, validize_mem (entry_parm)); | |
86f8eff3 | 4643 | |
3412b298 JW |
4644 | push_to_sequence (conversion_insns); |
4645 | entry_parm = convert_to_mode (nominal_mode, tempreg, | |
a53e14c0 | 4646 | TREE_UNSIGNED (TREE_TYPE (parm))); |
de957303 DE |
4647 | if (stack_parm) |
4648 | { | |
4649 | /* ??? This may need a big-endian conversion on sparc64. */ | |
4650 | stack_parm = change_address (stack_parm, nominal_mode, | |
4651 | NULL_RTX); | |
4652 | } | |
3412b298 | 4653 | conversion_insns = get_insns (); |
621061f4 | 4654 | did_conversion = 1; |
3412b298 | 4655 | end_sequence (); |
86f8eff3 | 4656 | } |
6f086dfc RS |
4657 | |
4658 | if (entry_parm != stack_parm) | |
4659 | { | |
4660 | if (stack_parm == 0) | |
7e41ffa2 RS |
4661 | { |
4662 | stack_parm | |
4663 | = assign_stack_local (GET_MODE (entry_parm), | |
4664 | GET_MODE_SIZE (GET_MODE (entry_parm)), 0); | |
4665 | /* If this is a memory ref that contains aggregate components, | |
4666 | mark it as such for cse and loop optimize. */ | |
c6df88cb | 4667 | MEM_SET_IN_STRUCT_P (stack_parm, aggregate); |
7e41ffa2 RS |
4668 | } |
4669 | ||
621061f4 | 4670 | if (promoted_mode != nominal_mode) |
3412b298 JW |
4671 | { |
4672 | push_to_sequence (conversion_insns); | |
4673 | emit_move_insn (validize_mem (stack_parm), | |
4674 | validize_mem (entry_parm)); | |
4675 | conversion_insns = get_insns (); | |
4676 | end_sequence (); | |
4677 | } | |
4678 | else | |
4679 | emit_move_insn (validize_mem (stack_parm), | |
4680 | validize_mem (entry_parm)); | |
6f086dfc | 4681 | } |
7d384cc0 | 4682 | if (current_function_check_memory_usage) |
86fa911a RK |
4683 | { |
4684 | push_to_sequence (conversion_insns); | |
4685 | emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3, | |
6a9c4aed | 4686 | XEXP (stack_parm, 0), Pmode, |
86fa911a RK |
4687 | GEN_INT (GET_MODE_SIZE (GET_MODE |
4688 | (entry_parm))), | |
4689 | TYPE_MODE (sizetype), | |
956d6950 JL |
4690 | GEN_INT (MEMORY_USE_RW), |
4691 | TYPE_MODE (integer_type_node)); | |
6f086dfc | 4692 | |
86fa911a RK |
4693 | conversion_insns = get_insns (); |
4694 | end_sequence (); | |
4695 | } | |
6f086dfc RS |
4696 | DECL_RTL (parm) = stack_parm; |
4697 | } | |
4698 | ||
4699 | /* If this "parameter" was the place where we are receiving the | |
4700 | function's incoming structure pointer, set up the result. */ | |
4701 | if (parm == function_result_decl) | |
ccdecf58 RK |
4702 | { |
4703 | tree result = DECL_RESULT (fndecl); | |
4704 | tree restype = TREE_TYPE (result); | |
4705 | ||
4706 | DECL_RTL (result) | |
38a448ca | 4707 | = gen_rtx_MEM (DECL_MODE (result), DECL_RTL (parm)); |
ccdecf58 | 4708 | |
c6df88cb MM |
4709 | MEM_SET_IN_STRUCT_P (DECL_RTL (result), |
4710 | AGGREGATE_TYPE_P (restype)); | |
ccdecf58 | 4711 | } |
6f086dfc RS |
4712 | |
4713 | if (TREE_THIS_VOLATILE (parm)) | |
4714 | MEM_VOLATILE_P (DECL_RTL (parm)) = 1; | |
4715 | if (TREE_READONLY (parm)) | |
4716 | RTX_UNCHANGING_P (DECL_RTL (parm)) = 1; | |
4717 | } | |
4718 | ||
3412b298 JW |
4719 | /* Output all parameter conversion instructions (possibly including calls) |
4720 | now that all parameters have been copied out of hard registers. */ | |
4721 | emit_insns (conversion_insns); | |
4722 | ||
6f086dfc RS |
4723 | last_parm_insn = get_last_insn (); |
4724 | ||
4725 | current_function_args_size = stack_args_size.constant; | |
4726 | ||
4727 | /* Adjust function incoming argument size for alignment and | |
4728 | minimum length. */ | |
4729 | ||
4730 | #ifdef REG_PARM_STACK_SPACE | |
6f90e075 | 4731 | #ifndef MAYBE_REG_PARM_STACK_SPACE |
6f086dfc RS |
4732 | current_function_args_size = MAX (current_function_args_size, |
4733 | REG_PARM_STACK_SPACE (fndecl)); | |
4734 | #endif | |
6f90e075 | 4735 | #endif |
6f086dfc | 4736 | |
4433e339 RH |
4737 | #ifdef STACK_BOUNDARY |
4738 | #define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT) | |
4739 | ||
4740 | current_function_args_size | |
4741 | = ((current_function_args_size + STACK_BYTES - 1) | |
4742 | / STACK_BYTES) * STACK_BYTES; | |
4743 | #endif | |
4744 | ||
6f086dfc RS |
4745 | #ifdef ARGS_GROW_DOWNWARD |
4746 | current_function_arg_offset_rtx | |
5f4f0e22 | 4747 | = (stack_args_size.var == 0 ? GEN_INT (-stack_args_size.constant) |
6f086dfc RS |
4748 | : expand_expr (size_binop (MINUS_EXPR, stack_args_size.var, |
4749 | size_int (-stack_args_size.constant)), | |
86fa911a | 4750 | NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD)); |
6f086dfc RS |
4751 | #else |
4752 | current_function_arg_offset_rtx = ARGS_SIZE_RTX (stack_args_size); | |
4753 | #endif | |
4754 | ||
4755 | /* See how many bytes, if any, of its args a function should try to pop | |
4756 | on return. */ | |
4757 | ||
64e6d9cc | 4758 | current_function_pops_args = RETURN_POPS_ARGS (fndecl, TREE_TYPE (fndecl), |
6f086dfc RS |
4759 | current_function_args_size); |
4760 | ||
3b69d50e RK |
4761 | /* For stdarg.h function, save info about |
4762 | regs and stack space used by the named args. */ | |
6f086dfc | 4763 | |
3b69d50e | 4764 | if (!hide_last_arg) |
6f086dfc RS |
4765 | current_function_args_info = args_so_far; |
4766 | ||
4767 | /* Set the rtx used for the function return value. Put this in its | |
4768 | own variable so any optimizers that need this information don't have | |
4769 | to include tree.h. Do this here so it gets done when an inlined | |
4770 | function gets output. */ | |
4771 | ||
4772 | current_function_return_rtx = DECL_RTL (DECL_RESULT (fndecl)); | |
4773 | } | |
4774 | \f | |
75dc3319 RK |
4775 | /* Indicate whether REGNO is an incoming argument to the current function |
4776 | that was promoted to a wider mode. If so, return the RTX for the | |
4777 | register (to get its mode). PMODE and PUNSIGNEDP are set to the mode | |
4778 | that REGNO is promoted from and whether the promotion was signed or | |
4779 | unsigned. */ | |
4780 | ||
4781 | #ifdef PROMOTE_FUNCTION_ARGS | |
4782 | ||
4783 | rtx | |
4784 | promoted_input_arg (regno, pmode, punsignedp) | |
4785 | int regno; | |
4786 | enum machine_mode *pmode; | |
4787 | int *punsignedp; | |
4788 | { | |
4789 | tree arg; | |
4790 | ||
4791 | for (arg = DECL_ARGUMENTS (current_function_decl); arg; | |
4792 | arg = TREE_CHAIN (arg)) | |
4793 | if (GET_CODE (DECL_INCOMING_RTL (arg)) == REG | |
621061f4 RK |
4794 | && REGNO (DECL_INCOMING_RTL (arg)) == regno |
4795 | && TYPE_MODE (DECL_ARG_TYPE (arg)) == TYPE_MODE (TREE_TYPE (arg))) | |
75dc3319 RK |
4796 | { |
4797 | enum machine_mode mode = TYPE_MODE (TREE_TYPE (arg)); | |
4798 | int unsignedp = TREE_UNSIGNED (TREE_TYPE (arg)); | |
4799 | ||
a5a52dbc | 4800 | mode = promote_mode (TREE_TYPE (arg), mode, &unsignedp, 1); |
75dc3319 RK |
4801 | if (mode == GET_MODE (DECL_INCOMING_RTL (arg)) |
4802 | && mode != DECL_MODE (arg)) | |
4803 | { | |
4804 | *pmode = DECL_MODE (arg); | |
4805 | *punsignedp = unsignedp; | |
4806 | return DECL_INCOMING_RTL (arg); | |
4807 | } | |
4808 | } | |
4809 | ||
4810 | return 0; | |
4811 | } | |
4812 | ||
4813 | #endif | |
4814 | \f | |
6f086dfc RS |
4815 | /* Compute the size and offset from the start of the stacked arguments for a |
4816 | parm passed in mode PASSED_MODE and with type TYPE. | |
4817 | ||
4818 | INITIAL_OFFSET_PTR points to the current offset into the stacked | |
4819 | arguments. | |
4820 | ||
4821 | The starting offset and size for this parm are returned in *OFFSET_PTR | |
4822 | and *ARG_SIZE_PTR, respectively. | |
4823 | ||
4824 | IN_REGS is non-zero if the argument will be passed in registers. It will | |
4825 | never be set if REG_PARM_STACK_SPACE is not defined. | |
4826 | ||
4827 | FNDECL is the function in which the argument was defined. | |
4828 | ||
4829 | There are two types of rounding that are done. The first, controlled by | |
4830 | FUNCTION_ARG_BOUNDARY, forces the offset from the start of the argument | |
4831 | list to be aligned to the specific boundary (in bits). This rounding | |
4832 | affects the initial and starting offsets, but not the argument size. | |
4833 | ||
4834 | The second, controlled by FUNCTION_ARG_PADDING and PARM_BOUNDARY, | |
4835 | optionally rounds the size of the parm to PARM_BOUNDARY. The | |
4836 | initial offset is not affected by this rounding, while the size always | |
4837 | is and the starting offset may be. */ | |
4838 | ||
4839 | /* offset_ptr will be negative for ARGS_GROW_DOWNWARD case; | |
4840 | initial_offset_ptr is positive because locate_and_pad_parm's | |
4841 | callers pass in the total size of args so far as | |
4842 | initial_offset_ptr. arg_size_ptr is always positive.*/ | |
4843 | ||
6f086dfc RS |
4844 | void |
4845 | locate_and_pad_parm (passed_mode, type, in_regs, fndecl, | |
4846 | initial_offset_ptr, offset_ptr, arg_size_ptr) | |
4847 | enum machine_mode passed_mode; | |
4848 | tree type; | |
4849 | int in_regs; | |
91813b28 | 4850 | tree fndecl ATTRIBUTE_UNUSED; |
6f086dfc RS |
4851 | struct args_size *initial_offset_ptr; |
4852 | struct args_size *offset_ptr; | |
4853 | struct args_size *arg_size_ptr; | |
4854 | { | |
4855 | tree sizetree | |
4856 | = type ? size_in_bytes (type) : size_int (GET_MODE_SIZE (passed_mode)); | |
4857 | enum direction where_pad = FUNCTION_ARG_PADDING (passed_mode, type); | |
4858 | int boundary = FUNCTION_ARG_BOUNDARY (passed_mode, type); | |
6f086dfc RS |
4859 | |
4860 | #ifdef REG_PARM_STACK_SPACE | |
4861 | /* If we have found a stack parm before we reach the end of the | |
4862 | area reserved for registers, skip that area. */ | |
4863 | if (! in_regs) | |
4864 | { | |
29a82058 JL |
4865 | int reg_parm_stack_space = 0; |
4866 | ||
29008b51 JW |
4867 | #ifdef MAYBE_REG_PARM_STACK_SPACE |
4868 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
4869 | #else | |
6f086dfc | 4870 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); |
29008b51 | 4871 | #endif |
6f086dfc RS |
4872 | if (reg_parm_stack_space > 0) |
4873 | { | |
4874 | if (initial_offset_ptr->var) | |
4875 | { | |
4876 | initial_offset_ptr->var | |
4877 | = size_binop (MAX_EXPR, ARGS_SIZE_TREE (*initial_offset_ptr), | |
4878 | size_int (reg_parm_stack_space)); | |
4879 | initial_offset_ptr->constant = 0; | |
4880 | } | |
4881 | else if (initial_offset_ptr->constant < reg_parm_stack_space) | |
4882 | initial_offset_ptr->constant = reg_parm_stack_space; | |
4883 | } | |
4884 | } | |
4885 | #endif /* REG_PARM_STACK_SPACE */ | |
4886 | ||
4887 | arg_size_ptr->var = 0; | |
4888 | arg_size_ptr->constant = 0; | |
4889 | ||
4890 | #ifdef ARGS_GROW_DOWNWARD | |
4891 | if (initial_offset_ptr->var) | |
4892 | { | |
4893 | offset_ptr->constant = 0; | |
4894 | offset_ptr->var = size_binop (MINUS_EXPR, integer_zero_node, | |
4895 | initial_offset_ptr->var); | |
4896 | } | |
4897 | else | |
4898 | { | |
4899 | offset_ptr->constant = - initial_offset_ptr->constant; | |
4900 | offset_ptr->var = 0; | |
4901 | } | |
0b21dcf5 | 4902 | if (where_pad != none |
6f086dfc RS |
4903 | && (TREE_CODE (sizetree) != INTEGER_CST |
4904 | || ((TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY))) | |
4905 | sizetree = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT); | |
4906 | SUB_PARM_SIZE (*offset_ptr, sizetree); | |
66bcbe19 TG |
4907 | if (where_pad != downward) |
4908 | pad_to_arg_alignment (offset_ptr, boundary); | |
6f086dfc RS |
4909 | if (initial_offset_ptr->var) |
4910 | { | |
4911 | arg_size_ptr->var = size_binop (MINUS_EXPR, | |
4912 | size_binop (MINUS_EXPR, | |
4913 | integer_zero_node, | |
4914 | initial_offset_ptr->var), | |
4915 | offset_ptr->var); | |
4916 | } | |
4917 | else | |
4918 | { | |
db3cf6fb MS |
4919 | arg_size_ptr->constant = (- initial_offset_ptr->constant |
4920 | - offset_ptr->constant); | |
6f086dfc | 4921 | } |
6f086dfc RS |
4922 | #else /* !ARGS_GROW_DOWNWARD */ |
4923 | pad_to_arg_alignment (initial_offset_ptr, boundary); | |
4924 | *offset_ptr = *initial_offset_ptr; | |
6f086dfc RS |
4925 | |
4926 | #ifdef PUSH_ROUNDING | |
4927 | if (passed_mode != BLKmode) | |
4928 | sizetree = size_int (PUSH_ROUNDING (TREE_INT_CST_LOW (sizetree))); | |
4929 | #endif | |
4930 | ||
d4b0a7a0 DE |
4931 | /* Pad_below needs the pre-rounded size to know how much to pad below |
4932 | so this must be done before rounding up. */ | |
ea5917da DE |
4933 | if (where_pad == downward |
4934 | /* However, BLKmode args passed in regs have their padding done elsewhere. | |
4935 | The stack slot must be able to hold the entire register. */ | |
4936 | && !(in_regs && passed_mode == BLKmode)) | |
d4b0a7a0 DE |
4937 | pad_below (offset_ptr, passed_mode, sizetree); |
4938 | ||
6f086dfc RS |
4939 | if (where_pad != none |
4940 | && (TREE_CODE (sizetree) != INTEGER_CST | |
4941 | || ((TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY))) | |
4942 | sizetree = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT); | |
4943 | ||
4944 | ADD_PARM_SIZE (*arg_size_ptr, sizetree); | |
4945 | #endif /* ARGS_GROW_DOWNWARD */ | |
4946 | } | |
4947 | ||
e16c591a RS |
4948 | /* Round the stack offset in *OFFSET_PTR up to a multiple of BOUNDARY. |
4949 | BOUNDARY is measured in bits, but must be a multiple of a storage unit. */ | |
4950 | ||
6f086dfc RS |
4951 | static void |
4952 | pad_to_arg_alignment (offset_ptr, boundary) | |
4953 | struct args_size *offset_ptr; | |
4954 | int boundary; | |
4955 | { | |
4956 | int boundary_in_bytes = boundary / BITS_PER_UNIT; | |
4957 | ||
4958 | if (boundary > BITS_PER_UNIT) | |
4959 | { | |
4960 | if (offset_ptr->var) | |
4961 | { | |
4962 | offset_ptr->var = | |
4963 | #ifdef ARGS_GROW_DOWNWARD | |
4964 | round_down | |
4965 | #else | |
4966 | round_up | |
4967 | #endif | |
4968 | (ARGS_SIZE_TREE (*offset_ptr), | |
4969 | boundary / BITS_PER_UNIT); | |
4970 | offset_ptr->constant = 0; /*?*/ | |
4971 | } | |
4972 | else | |
4973 | offset_ptr->constant = | |
4974 | #ifdef ARGS_GROW_DOWNWARD | |
4975 | FLOOR_ROUND (offset_ptr->constant, boundary_in_bytes); | |
4976 | #else | |
4977 | CEIL_ROUND (offset_ptr->constant, boundary_in_bytes); | |
4978 | #endif | |
4979 | } | |
4980 | } | |
4981 | ||
51723711 | 4982 | #ifndef ARGS_GROW_DOWNWARD |
6f086dfc RS |
4983 | static void |
4984 | pad_below (offset_ptr, passed_mode, sizetree) | |
4985 | struct args_size *offset_ptr; | |
4986 | enum machine_mode passed_mode; | |
4987 | tree sizetree; | |
4988 | { | |
4989 | if (passed_mode != BLKmode) | |
4990 | { | |
4991 | if (GET_MODE_BITSIZE (passed_mode) % PARM_BOUNDARY) | |
4992 | offset_ptr->constant | |
4993 | += (((GET_MODE_BITSIZE (passed_mode) + PARM_BOUNDARY - 1) | |
4994 | / PARM_BOUNDARY * PARM_BOUNDARY / BITS_PER_UNIT) | |
4995 | - GET_MODE_SIZE (passed_mode)); | |
4996 | } | |
4997 | else | |
4998 | { | |
4999 | if (TREE_CODE (sizetree) != INTEGER_CST | |
5000 | || (TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY) | |
5001 | { | |
5002 | /* Round the size up to multiple of PARM_BOUNDARY bits. */ | |
5003 | tree s2 = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT); | |
5004 | /* Add it in. */ | |
5005 | ADD_PARM_SIZE (*offset_ptr, s2); | |
5006 | SUB_PARM_SIZE (*offset_ptr, sizetree); | |
5007 | } | |
5008 | } | |
5009 | } | |
51723711 | 5010 | #endif |
6f086dfc | 5011 | |
487a6e06 | 5012 | #ifdef ARGS_GROW_DOWNWARD |
6f086dfc RS |
5013 | static tree |
5014 | round_down (value, divisor) | |
5015 | tree value; | |
5016 | int divisor; | |
5017 | { | |
5018 | return size_binop (MULT_EXPR, | |
5019 | size_binop (FLOOR_DIV_EXPR, value, size_int (divisor)), | |
5020 | size_int (divisor)); | |
5021 | } | |
487a6e06 | 5022 | #endif |
6f086dfc RS |
5023 | \f |
5024 | /* Walk the tree of blocks describing the binding levels within a function | |
5025 | and warn about uninitialized variables. | |
5026 | This is done after calling flow_analysis and before global_alloc | |
5027 | clobbers the pseudo-regs to hard regs. */ | |
5028 | ||
5029 | void | |
5030 | uninitialized_vars_warning (block) | |
5031 | tree block; | |
5032 | { | |
5033 | register tree decl, sub; | |
5034 | for (decl = BLOCK_VARS (block); decl; decl = TREE_CHAIN (decl)) | |
5035 | { | |
5036 | if (TREE_CODE (decl) == VAR_DECL | |
5037 | /* These warnings are unreliable for and aggregates | |
5038 | because assigning the fields one by one can fail to convince | |
5039 | flow.c that the entire aggregate was initialized. | |
5040 | Unions are troublesome because members may be shorter. */ | |
05e3bdb9 | 5041 | && ! AGGREGATE_TYPE_P (TREE_TYPE (decl)) |
6f086dfc RS |
5042 | && DECL_RTL (decl) != 0 |
5043 | && GET_CODE (DECL_RTL (decl)) == REG | |
6acdd0fd JL |
5044 | /* Global optimizations can make it difficult to determine if a |
5045 | particular variable has been initialized. However, a VAR_DECL | |
5046 | with a nonzero DECL_INITIAL had an initializer, so do not | |
5047 | claim it is potentially uninitialized. | |
5048 | ||
5049 | We do not care about the actual value in DECL_INITIAL, so we do | |
5050 | not worry that it may be a dangling pointer. */ | |
5051 | && DECL_INITIAL (decl) == NULL_TREE | |
6f086dfc RS |
5052 | && regno_uninitialized (REGNO (DECL_RTL (decl)))) |
5053 | warning_with_decl (decl, | |
3c8cd8bd | 5054 | "`%s' might be used uninitialized in this function"); |
6f086dfc RS |
5055 | if (TREE_CODE (decl) == VAR_DECL |
5056 | && DECL_RTL (decl) != 0 | |
5057 | && GET_CODE (DECL_RTL (decl)) == REG | |
5058 | && regno_clobbered_at_setjmp (REGNO (DECL_RTL (decl)))) | |
5059 | warning_with_decl (decl, | |
3c8cd8bd | 5060 | "variable `%s' might be clobbered by `longjmp' or `vfork'"); |
6f086dfc RS |
5061 | } |
5062 | for (sub = BLOCK_SUBBLOCKS (block); sub; sub = TREE_CHAIN (sub)) | |
5063 | uninitialized_vars_warning (sub); | |
5064 | } | |
5065 | ||
5066 | /* Do the appropriate part of uninitialized_vars_warning | |
5067 | but for arguments instead of local variables. */ | |
5068 | ||
5069 | void | |
0cd6ef35 | 5070 | setjmp_args_warning () |
6f086dfc RS |
5071 | { |
5072 | register tree decl; | |
5073 | for (decl = DECL_ARGUMENTS (current_function_decl); | |
5074 | decl; decl = TREE_CHAIN (decl)) | |
5075 | if (DECL_RTL (decl) != 0 | |
5076 | && GET_CODE (DECL_RTL (decl)) == REG | |
5077 | && regno_clobbered_at_setjmp (REGNO (DECL_RTL (decl)))) | |
3c8cd8bd | 5078 | warning_with_decl (decl, "argument `%s' might be clobbered by `longjmp' or `vfork'"); |
6f086dfc RS |
5079 | } |
5080 | ||
5081 | /* If this function call setjmp, put all vars into the stack | |
5082 | unless they were declared `register'. */ | |
5083 | ||
5084 | void | |
5085 | setjmp_protect (block) | |
5086 | tree block; | |
5087 | { | |
5088 | register tree decl, sub; | |
5089 | for (decl = BLOCK_VARS (block); decl; decl = TREE_CHAIN (decl)) | |
5090 | if ((TREE_CODE (decl) == VAR_DECL | |
5091 | || TREE_CODE (decl) == PARM_DECL) | |
5092 | && DECL_RTL (decl) != 0 | |
e9a25f70 JL |
5093 | && (GET_CODE (DECL_RTL (decl)) == REG |
5094 | || (GET_CODE (DECL_RTL (decl)) == MEM | |
5095 | && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF)) | |
b335c2cc | 5096 | /* If this variable came from an inline function, it must be |
9ec36da5 | 5097 | that its life doesn't overlap the setjmp. If there was a |
b335c2cc TW |
5098 | setjmp in the function, it would already be in memory. We |
5099 | must exclude such variable because their DECL_RTL might be | |
5100 | set to strange things such as virtual_stack_vars_rtx. */ | |
5101 | && ! DECL_FROM_INLINE (decl) | |
6f086dfc RS |
5102 | && ( |
5103 | #ifdef NON_SAVING_SETJMP | |
5104 | /* If longjmp doesn't restore the registers, | |
5105 | don't put anything in them. */ | |
5106 | NON_SAVING_SETJMP | |
5107 | || | |
5108 | #endif | |
a82ad570 | 5109 | ! DECL_REGISTER (decl))) |
6f086dfc RS |
5110 | put_var_into_stack (decl); |
5111 | for (sub = BLOCK_SUBBLOCKS (block); sub; sub = TREE_CHAIN (sub)) | |
5112 | setjmp_protect (sub); | |
5113 | } | |
5114 | \f | |
5115 | /* Like the previous function, but for args instead of local variables. */ | |
5116 | ||
5117 | void | |
5118 | setjmp_protect_args () | |
5119 | { | |
29a82058 | 5120 | register tree decl; |
6f086dfc RS |
5121 | for (decl = DECL_ARGUMENTS (current_function_decl); |
5122 | decl; decl = TREE_CHAIN (decl)) | |
5123 | if ((TREE_CODE (decl) == VAR_DECL | |
5124 | || TREE_CODE (decl) == PARM_DECL) | |
5125 | && DECL_RTL (decl) != 0 | |
e9a25f70 JL |
5126 | && (GET_CODE (DECL_RTL (decl)) == REG |
5127 | || (GET_CODE (DECL_RTL (decl)) == MEM | |
5128 | && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF)) | |
6f086dfc RS |
5129 | && ( |
5130 | /* If longjmp doesn't restore the registers, | |
5131 | don't put anything in them. */ | |
5132 | #ifdef NON_SAVING_SETJMP | |
5133 | NON_SAVING_SETJMP | |
5134 | || | |
5135 | #endif | |
a82ad570 | 5136 | ! DECL_REGISTER (decl))) |
6f086dfc RS |
5137 | put_var_into_stack (decl); |
5138 | } | |
5139 | \f | |
5140 | /* Return the context-pointer register corresponding to DECL, | |
5141 | or 0 if it does not need one. */ | |
5142 | ||
5143 | rtx | |
5144 | lookup_static_chain (decl) | |
5145 | tree decl; | |
5146 | { | |
b001a02f PB |
5147 | tree context = decl_function_context (decl); |
5148 | tree link; | |
7ad8c4bf | 5149 | |
38ee6ed9 JM |
5150 | if (context == 0 |
5151 | || (TREE_CODE (decl) == FUNCTION_DECL && DECL_NO_STATIC_CHAIN (decl))) | |
7ad8c4bf | 5152 | return 0; |
38ee6ed9 | 5153 | |
6f086dfc RS |
5154 | /* We treat inline_function_decl as an alias for the current function |
5155 | because that is the inline function whose vars, types, etc. | |
5156 | are being merged into the current function. | |
5157 | See expand_inline_function. */ | |
5158 | if (context == current_function_decl || context == inline_function_decl) | |
5159 | return virtual_stack_vars_rtx; | |
5160 | ||
5161 | for (link = context_display; link; link = TREE_CHAIN (link)) | |
5162 | if (TREE_PURPOSE (link) == context) | |
5163 | return RTL_EXPR_RTL (TREE_VALUE (link)); | |
5164 | ||
5165 | abort (); | |
5166 | } | |
5167 | \f | |
5168 | /* Convert a stack slot address ADDR for variable VAR | |
5169 | (from a containing function) | |
5170 | into an address valid in this function (using a static chain). */ | |
5171 | ||
5172 | rtx | |
5173 | fix_lexical_addr (addr, var) | |
5174 | rtx addr; | |
5175 | tree var; | |
5176 | { | |
5177 | rtx basereg; | |
e5e809f4 | 5178 | HOST_WIDE_INT displacement; |
6f086dfc RS |
5179 | tree context = decl_function_context (var); |
5180 | struct function *fp; | |
5181 | rtx base = 0; | |
5182 | ||
5183 | /* If this is the present function, we need not do anything. */ | |
5184 | if (context == current_function_decl || context == inline_function_decl) | |
5185 | return addr; | |
5186 | ||
5187 | for (fp = outer_function_chain; fp; fp = fp->next) | |
5188 | if (fp->decl == context) | |
5189 | break; | |
5190 | ||
5191 | if (fp == 0) | |
5192 | abort (); | |
5193 | ||
e9a25f70 JL |
5194 | if (GET_CODE (addr) == ADDRESSOF && GET_CODE (XEXP (addr, 0)) == MEM) |
5195 | addr = XEXP (XEXP (addr, 0), 0); | |
5196 | ||
6f086dfc RS |
5197 | /* Decode given address as base reg plus displacement. */ |
5198 | if (GET_CODE (addr) == REG) | |
5199 | basereg = addr, displacement = 0; | |
5200 | else if (GET_CODE (addr) == PLUS && GET_CODE (XEXP (addr, 1)) == CONST_INT) | |
5201 | basereg = XEXP (addr, 0), displacement = INTVAL (XEXP (addr, 1)); | |
5202 | else | |
5203 | abort (); | |
5204 | ||
5205 | /* We accept vars reached via the containing function's | |
5206 | incoming arg pointer and via its stack variables pointer. */ | |
5207 | if (basereg == fp->internal_arg_pointer) | |
5208 | { | |
5209 | /* If reached via arg pointer, get the arg pointer value | |
5210 | out of that function's stack frame. | |
5211 | ||
5212 | There are two cases: If a separate ap is needed, allocate a | |
5213 | slot in the outer function for it and dereference it that way. | |
5214 | This is correct even if the real ap is actually a pseudo. | |
5215 | Otherwise, just adjust the offset from the frame pointer to | |
5216 | compensate. */ | |
5217 | ||
5218 | #ifdef NEED_SEPARATE_AP | |
5219 | rtx addr; | |
5220 | ||
49ad7cfa BS |
5221 | if (fp->x_arg_pointer_save_area == 0) |
5222 | fp->x_arg_pointer_save_area | |
6f086dfc RS |
5223 | = assign_outer_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0, fp); |
5224 | ||
49ad7cfa | 5225 | addr = fix_lexical_addr (XEXP (fp->x_arg_pointer_save_area, 0), var); |
6f086dfc RS |
5226 | addr = memory_address (Pmode, addr); |
5227 | ||
38a448ca | 5228 | base = copy_to_reg (gen_rtx_MEM (Pmode, addr)); |
6f086dfc RS |
5229 | #else |
5230 | displacement += (FIRST_PARM_OFFSET (context) - STARTING_FRAME_OFFSET); | |
86f8eff3 | 5231 | base = lookup_static_chain (var); |
6f086dfc RS |
5232 | #endif |
5233 | } | |
5234 | ||
5235 | else if (basereg == virtual_stack_vars_rtx) | |
5236 | { | |
5237 | /* This is the same code as lookup_static_chain, duplicated here to | |
5238 | avoid an extra call to decl_function_context. */ | |
5239 | tree link; | |
5240 | ||
5241 | for (link = context_display; link; link = TREE_CHAIN (link)) | |
5242 | if (TREE_PURPOSE (link) == context) | |
5243 | { | |
5244 | base = RTL_EXPR_RTL (TREE_VALUE (link)); | |
5245 | break; | |
5246 | } | |
5247 | } | |
5248 | ||
5249 | if (base == 0) | |
5250 | abort (); | |
5251 | ||
5252 | /* Use same offset, relative to appropriate static chain or argument | |
5253 | pointer. */ | |
5254 | return plus_constant (base, displacement); | |
5255 | } | |
5256 | \f | |
5257 | /* Return the address of the trampoline for entering nested fn FUNCTION. | |
5258 | If necessary, allocate a trampoline (in the stack frame) | |
5259 | and emit rtl to initialize its contents (at entry to this function). */ | |
5260 | ||
5261 | rtx | |
5262 | trampoline_address (function) | |
5263 | tree function; | |
5264 | { | |
5265 | tree link; | |
5266 | tree rtlexp; | |
5267 | rtx tramp; | |
5268 | struct function *fp; | |
5269 | tree fn_context; | |
5270 | ||
5271 | /* Find an existing trampoline and return it. */ | |
5272 | for (link = trampoline_list; link; link = TREE_CHAIN (link)) | |
5273 | if (TREE_PURPOSE (link) == function) | |
e87ee2a9 RK |
5274 | return |
5275 | round_trampoline_addr (XEXP (RTL_EXPR_RTL (TREE_VALUE (link)), 0)); | |
5276 | ||
6f086dfc | 5277 | for (fp = outer_function_chain; fp; fp = fp->next) |
49ad7cfa | 5278 | for (link = fp->x_trampoline_list; link; link = TREE_CHAIN (link)) |
6f086dfc RS |
5279 | if (TREE_PURPOSE (link) == function) |
5280 | { | |
5281 | tramp = fix_lexical_addr (XEXP (RTL_EXPR_RTL (TREE_VALUE (link)), 0), | |
5282 | function); | |
5283 | return round_trampoline_addr (tramp); | |
5284 | } | |
5285 | ||
5286 | /* None exists; we must make one. */ | |
5287 | ||
5288 | /* Find the `struct function' for the function containing FUNCTION. */ | |
5289 | fp = 0; | |
5290 | fn_context = decl_function_context (function); | |
4ac74fb8 RK |
5291 | if (fn_context != current_function_decl |
5292 | && fn_context != inline_function_decl) | |
6f086dfc RS |
5293 | for (fp = outer_function_chain; fp; fp = fp->next) |
5294 | if (fp->decl == fn_context) | |
5295 | break; | |
5296 | ||
5297 | /* Allocate run-time space for this trampoline | |
5298 | (usually in the defining function's stack frame). */ | |
5299 | #ifdef ALLOCATE_TRAMPOLINE | |
5300 | tramp = ALLOCATE_TRAMPOLINE (fp); | |
5301 | #else | |
5302 | /* If rounding needed, allocate extra space | |
5303 | to ensure we have TRAMPOLINE_SIZE bytes left after rounding up. */ | |
5304 | #ifdef TRAMPOLINE_ALIGNMENT | |
b02ab63a RK |
5305 | #define TRAMPOLINE_REAL_SIZE \ |
5306 | (TRAMPOLINE_SIZE + (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT) - 1) | |
6f086dfc RS |
5307 | #else |
5308 | #define TRAMPOLINE_REAL_SIZE (TRAMPOLINE_SIZE) | |
5309 | #endif | |
5310 | if (fp != 0) | |
5311 | tramp = assign_outer_stack_local (BLKmode, TRAMPOLINE_REAL_SIZE, 0, fp); | |
5312 | else | |
5313 | tramp = assign_stack_local (BLKmode, TRAMPOLINE_REAL_SIZE, 0); | |
5314 | #endif | |
5315 | ||
5316 | /* Record the trampoline for reuse and note it for later initialization | |
5317 | by expand_function_end. */ | |
5318 | if (fp != 0) | |
5319 | { | |
28498644 RK |
5320 | push_obstacks (fp->function_maybepermanent_obstack, |
5321 | fp->function_maybepermanent_obstack); | |
6f086dfc RS |
5322 | rtlexp = make_node (RTL_EXPR); |
5323 | RTL_EXPR_RTL (rtlexp) = tramp; | |
49ad7cfa BS |
5324 | fp->x_trampoline_list = tree_cons (function, rtlexp, |
5325 | fp->x_trampoline_list); | |
6f086dfc RS |
5326 | pop_obstacks (); |
5327 | } | |
5328 | else | |
5329 | { | |
5330 | /* Make the RTL_EXPR node temporary, not momentary, so that the | |
5331 | trampoline_list doesn't become garbage. */ | |
5332 | int momentary = suspend_momentary (); | |
5333 | rtlexp = make_node (RTL_EXPR); | |
5334 | resume_momentary (momentary); | |
5335 | ||
5336 | RTL_EXPR_RTL (rtlexp) = tramp; | |
5337 | trampoline_list = tree_cons (function, rtlexp, trampoline_list); | |
5338 | } | |
5339 | ||
5340 | tramp = fix_lexical_addr (XEXP (tramp, 0), function); | |
5341 | return round_trampoline_addr (tramp); | |
5342 | } | |
5343 | ||
5344 | /* Given a trampoline address, | |
5345 | round it to multiple of TRAMPOLINE_ALIGNMENT. */ | |
5346 | ||
5347 | static rtx | |
5348 | round_trampoline_addr (tramp) | |
5349 | rtx tramp; | |
5350 | { | |
5351 | #ifdef TRAMPOLINE_ALIGNMENT | |
5352 | /* Round address up to desired boundary. */ | |
5353 | rtx temp = gen_reg_rtx (Pmode); | |
5354 | temp = expand_binop (Pmode, add_optab, tramp, | |
b02ab63a | 5355 | GEN_INT (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT - 1), |
6f086dfc RS |
5356 | temp, 0, OPTAB_LIB_WIDEN); |
5357 | tramp = expand_binop (Pmode, and_optab, temp, | |
b02ab63a | 5358 | GEN_INT (- TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT), |
6f086dfc RS |
5359 | temp, 0, OPTAB_LIB_WIDEN); |
5360 | #endif | |
5361 | return tramp; | |
5362 | } | |
5363 | \f | |
467456d0 RS |
5364 | /* The functions identify_blocks and reorder_blocks provide a way to |
5365 | reorder the tree of BLOCK nodes, for optimizers that reshuffle or | |
5366 | duplicate portions of the RTL code. Call identify_blocks before | |
5367 | changing the RTL, and call reorder_blocks after. */ | |
5368 | ||
b2a59b15 MS |
5369 | /* Put all this function's BLOCK nodes including those that are chained |
5370 | onto the first block into a vector, and return it. | |
467456d0 RS |
5371 | Also store in each NOTE for the beginning or end of a block |
5372 | the index of that block in the vector. | |
b2a59b15 | 5373 | The arguments are BLOCK, the chain of top-level blocks of the function, |
467456d0 RS |
5374 | and INSNS, the insn chain of the function. */ |
5375 | ||
5376 | tree * | |
b2a59b15 MS |
5377 | identify_blocks (block, insns) |
5378 | tree block; | |
467456d0 RS |
5379 | rtx insns; |
5380 | { | |
fc289cd1 JW |
5381 | int n_blocks; |
5382 | tree *block_vector; | |
5383 | int *block_stack; | |
467456d0 | 5384 | int depth = 0; |
b2a59b15 MS |
5385 | int next_block_number = 1; |
5386 | int current_block_number = 1; | |
467456d0 RS |
5387 | rtx insn; |
5388 | ||
b2a59b15 | 5389 | if (block == 0) |
fc289cd1 JW |
5390 | return 0; |
5391 | ||
b2a59b15 | 5392 | n_blocks = all_blocks (block, 0); |
fc289cd1 JW |
5393 | block_vector = (tree *) xmalloc (n_blocks * sizeof (tree)); |
5394 | block_stack = (int *) alloca (n_blocks * sizeof (int)); | |
5395 | ||
b2a59b15 | 5396 | all_blocks (block, block_vector); |
467456d0 RS |
5397 | |
5398 | for (insn = insns; insn; insn = NEXT_INSN (insn)) | |
5399 | if (GET_CODE (insn) == NOTE) | |
5400 | { | |
5401 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG) | |
5402 | { | |
5403 | block_stack[depth++] = current_block_number; | |
5404 | current_block_number = next_block_number; | |
1b2ac438 | 5405 | NOTE_BLOCK_NUMBER (insn) = next_block_number++; |
467456d0 RS |
5406 | } |
5407 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END) | |
5408 | { | |
1b2ac438 | 5409 | NOTE_BLOCK_NUMBER (insn) = current_block_number; |
c7fdfd49 | 5410 | current_block_number = block_stack[--depth]; |
467456d0 RS |
5411 | } |
5412 | } | |
5413 | ||
b2a59b15 MS |
5414 | if (n_blocks != next_block_number) |
5415 | abort (); | |
5416 | ||
467456d0 RS |
5417 | return block_vector; |
5418 | } | |
5419 | ||
5420 | /* Given BLOCK_VECTOR which was returned by identify_blocks, | |
5421 | and a revised instruction chain, rebuild the tree structure | |
5422 | of BLOCK nodes to correspond to the new order of RTL. | |
fc289cd1 | 5423 | The new block tree is inserted below TOP_BLOCK. |
467456d0 RS |
5424 | Returns the current top-level block. */ |
5425 | ||
5426 | tree | |
b2a59b15 | 5427 | reorder_blocks (block_vector, block, insns) |
467456d0 | 5428 | tree *block_vector; |
b2a59b15 | 5429 | tree block; |
467456d0 RS |
5430 | rtx insns; |
5431 | { | |
b2a59b15 | 5432 | tree current_block = block; |
467456d0 RS |
5433 | rtx insn; |
5434 | ||
fc289cd1 | 5435 | if (block_vector == 0) |
b2a59b15 | 5436 | return block; |
fc289cd1 | 5437 | |
b2a59b15 | 5438 | /* Prune the old trees away, so that it doesn't get in the way. */ |
fc289cd1 | 5439 | BLOCK_SUBBLOCKS (current_block) = 0; |
b2a59b15 | 5440 | BLOCK_CHAIN (current_block) = 0; |
fc289cd1 | 5441 | |
467456d0 RS |
5442 | for (insn = insns; insn; insn = NEXT_INSN (insn)) |
5443 | if (GET_CODE (insn) == NOTE) | |
5444 | { | |
5445 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG) | |
5446 | { | |
5447 | tree block = block_vector[NOTE_BLOCK_NUMBER (insn)]; | |
5448 | /* If we have seen this block before, copy it. */ | |
5449 | if (TREE_ASM_WRITTEN (block)) | |
5450 | block = copy_node (block); | |
fc289cd1 | 5451 | BLOCK_SUBBLOCKS (block) = 0; |
467456d0 RS |
5452 | TREE_ASM_WRITTEN (block) = 1; |
5453 | BLOCK_SUPERCONTEXT (block) = current_block; | |
5454 | BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (current_block); | |
5455 | BLOCK_SUBBLOCKS (current_block) = block; | |
5456 | current_block = block; | |
1b2ac438 | 5457 | NOTE_SOURCE_FILE (insn) = 0; |
467456d0 RS |
5458 | } |
5459 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END) | |
5460 | { | |
5461 | BLOCK_SUBBLOCKS (current_block) | |
5462 | = blocks_nreverse (BLOCK_SUBBLOCKS (current_block)); | |
5463 | current_block = BLOCK_SUPERCONTEXT (current_block); | |
1b2ac438 | 5464 | NOTE_SOURCE_FILE (insn) = 0; |
467456d0 RS |
5465 | } |
5466 | } | |
5467 | ||
b2a59b15 MS |
5468 | BLOCK_SUBBLOCKS (current_block) |
5469 | = blocks_nreverse (BLOCK_SUBBLOCKS (current_block)); | |
467456d0 RS |
5470 | return current_block; |
5471 | } | |
5472 | ||
5473 | /* Reverse the order of elements in the chain T of blocks, | |
5474 | and return the new head of the chain (old last element). */ | |
5475 | ||
5476 | static tree | |
5477 | blocks_nreverse (t) | |
5478 | tree t; | |
5479 | { | |
5480 | register tree prev = 0, decl, next; | |
5481 | for (decl = t; decl; decl = next) | |
5482 | { | |
5483 | next = BLOCK_CHAIN (decl); | |
5484 | BLOCK_CHAIN (decl) = prev; | |
5485 | prev = decl; | |
5486 | } | |
5487 | return prev; | |
5488 | } | |
5489 | ||
b2a59b15 MS |
5490 | /* Count the subblocks of the list starting with BLOCK, and list them |
5491 | all into the vector VECTOR. Also clear TREE_ASM_WRITTEN in all | |
5492 | blocks. */ | |
467456d0 RS |
5493 | |
5494 | static int | |
5495 | all_blocks (block, vector) | |
5496 | tree block; | |
5497 | tree *vector; | |
5498 | { | |
b2a59b15 MS |
5499 | int n_blocks = 0; |
5500 | ||
5501 | while (block) | |
5502 | { | |
5503 | TREE_ASM_WRITTEN (block) = 0; | |
5504 | ||
5505 | /* Record this block. */ | |
5506 | if (vector) | |
5507 | vector[n_blocks] = block; | |
5508 | ||
5509 | ++n_blocks; | |
5510 | ||
5511 | /* Record the subblocks, and their subblocks... */ | |
5512 | n_blocks += all_blocks (BLOCK_SUBBLOCKS (block), | |
5513 | vector ? vector + n_blocks : 0); | |
5514 | block = BLOCK_CHAIN (block); | |
5515 | } | |
467456d0 RS |
5516 | |
5517 | return n_blocks; | |
5518 | } | |
5519 | \f | |
b384405b BS |
5520 | /* Allocate a function structure and reset its contents to the defaults. */ |
5521 | static void | |
5522 | prepare_function_start () | |
6f086dfc | 5523 | { |
b384405b BS |
5524 | current_function = (struct function *) xcalloc (1, sizeof (struct function)); |
5525 | ||
6f086dfc RS |
5526 | init_stmt_for_function (); |
5527 | ||
5528 | cse_not_expected = ! optimize; | |
5529 | ||
5530 | /* Caller save not needed yet. */ | |
5531 | caller_save_needed = 0; | |
5532 | ||
5533 | /* No stack slots have been made yet. */ | |
5534 | stack_slot_list = 0; | |
5535 | ||
b384405b BS |
5536 | current_function_has_nonlocal_label = 0; |
5537 | current_function_has_nonlocal_goto = 0; | |
5538 | ||
6f086dfc | 5539 | /* There is no stack slot for handling nonlocal gotos. */ |
ba716ac9 | 5540 | nonlocal_goto_handler_slots = 0; |
6f086dfc RS |
5541 | nonlocal_goto_stack_level = 0; |
5542 | ||
5543 | /* No labels have been declared for nonlocal use. */ | |
5544 | nonlocal_labels = 0; | |
e881bb1b | 5545 | nonlocal_goto_handler_labels = 0; |
6f086dfc RS |
5546 | |
5547 | /* No function calls so far in this function. */ | |
5548 | function_call_count = 0; | |
5549 | ||
5550 | /* No parm regs have been allocated. | |
5551 | (This is important for output_inline_function.) */ | |
5552 | max_parm_reg = LAST_VIRTUAL_REGISTER + 1; | |
5553 | ||
5554 | /* Initialize the RTL mechanism. */ | |
5555 | init_emit (); | |
5556 | ||
5557 | /* Initialize the queue of pending postincrement and postdecrements, | |
5558 | and some other info in expr.c. */ | |
5559 | init_expr (); | |
b384405b | 5560 | |
6f086dfc RS |
5561 | /* We haven't done register allocation yet. */ |
5562 | reg_renumber = 0; | |
5563 | ||
5564 | init_const_rtx_hash_table (); | |
5565 | ||
6f086dfc RS |
5566 | /* Set if a call to setjmp is seen. */ |
5567 | current_function_calls_setjmp = 0; | |
5568 | ||
5569 | /* Set if a call to longjmp is seen. */ | |
5570 | current_function_calls_longjmp = 0; | |
5571 | ||
5572 | current_function_calls_alloca = 0; | |
6f086dfc | 5573 | current_function_contains_functions = 0; |
54ff41b7 | 5574 | current_function_is_leaf = 0; |
fdb8a883 | 5575 | current_function_sp_is_unchanging = 0; |
54ff41b7 | 5576 | current_function_uses_only_leaf_regs = 0; |
acd693d1 | 5577 | current_function_has_computed_jump = 0; |
173cd503 | 5578 | current_function_is_thunk = 0; |
6f086dfc RS |
5579 | |
5580 | current_function_returns_pcc_struct = 0; | |
5581 | current_function_returns_struct = 0; | |
5582 | current_function_epilogue_delay_list = 0; | |
5583 | current_function_uses_const_pool = 0; | |
5584 | current_function_uses_pic_offset_table = 0; | |
aeb302bb | 5585 | current_function_cannot_inline = 0; |
6f086dfc | 5586 | |
49ad7cfa BS |
5587 | current_function->inlinable = 0; |
5588 | ||
6f086dfc RS |
5589 | /* We have not yet needed to make a label to jump to for tail-recursion. */ |
5590 | tail_recursion_label = 0; | |
5591 | ||
5592 | /* We haven't had a need to make a save area for ap yet. */ | |
6f086dfc RS |
5593 | arg_pointer_save_area = 0; |
5594 | ||
5595 | /* No stack slots allocated yet. */ | |
5596 | frame_offset = 0; | |
5597 | ||
5598 | /* No SAVE_EXPRs in this function yet. */ | |
5599 | save_expr_regs = 0; | |
5600 | ||
5601 | /* No RTL_EXPRs in this function yet. */ | |
5602 | rtl_expr_chain = 0; | |
5603 | ||
bc0ebdf9 RK |
5604 | /* Set up to allocate temporaries. */ |
5605 | init_temp_slots (); | |
6f086dfc | 5606 | |
b384405b BS |
5607 | /* Indicate that we need to distinguish between the return value of the |
5608 | present function and the return value of a function being called. */ | |
5609 | rtx_equal_function_value_matters = 1; | |
5610 | ||
5611 | /* Indicate that we have not instantiated virtual registers yet. */ | |
5612 | virtuals_instantiated = 0; | |
5613 | ||
5614 | /* Indicate we have no need of a frame pointer yet. */ | |
5615 | frame_pointer_needed = 0; | |
5616 | ||
5617 | /* By default assume not varargs or stdarg. */ | |
5618 | current_function_varargs = 0; | |
5619 | current_function_stdarg = 0; | |
6f086dfc | 5620 | |
d9a98e1a RK |
5621 | /* We haven't made any trampolines for this function yet. */ |
5622 | trampoline_list = 0; | |
5623 | ||
6f086dfc RS |
5624 | init_pending_stack_adjust (); |
5625 | inhibit_defer_pop = 0; | |
5626 | ||
5627 | current_function_outgoing_args_size = 0; | |
b384405b BS |
5628 | } |
5629 | ||
5630 | /* Initialize the rtl expansion mechanism so that we can do simple things | |
5631 | like generate sequences. This is used to provide a context during global | |
5632 | initialization of some passes. */ | |
5633 | void | |
5634 | init_dummy_function_start () | |
5635 | { | |
5636 | prepare_function_start (); | |
5637 | } | |
5638 | ||
5639 | /* Generate RTL for the start of the function SUBR (a FUNCTION_DECL tree node) | |
5640 | and initialize static variables for generating RTL for the statements | |
5641 | of the function. */ | |
5642 | ||
5643 | void | |
5644 | init_function_start (subr, filename, line) | |
5645 | tree subr; | |
5646 | char *filename; | |
5647 | int line; | |
5648 | { | |
5649 | prepare_function_start (); | |
5650 | ||
5651 | /* Remember this function for later. */ | |
5652 | current_function->next_global = all_functions; | |
5653 | all_functions = current_function; | |
5654 | ||
5655 | current_function_name = (*decl_printable_name) (subr, 2); | |
5656 | ||
5657 | /* Nonzero if this is a nested function that uses a static chain. */ | |
5658 | ||
5659 | current_function_needs_context | |
5660 | = (decl_function_context (current_function_decl) != 0 | |
5661 | && ! DECL_NO_STATIC_CHAIN (current_function_decl)); | |
5662 | ||
5663 | /* Within function body, compute a type's size as soon it is laid out. */ | |
5664 | immediate_size_expand++; | |
6f086dfc | 5665 | |
6f086dfc | 5666 | /* Prevent ever trying to delete the first instruction of a function. |
b274104c PB |
5667 | Also tell final how to output a linenum before the function prologue. |
5668 | Note linenums could be missing, e.g. when compiling a Java .class file. */ | |
5669 | if (line > 0) | |
5670 | emit_line_note (filename, line); | |
6f086dfc RS |
5671 | |
5672 | /* Make sure first insn is a note even if we don't want linenums. | |
5673 | This makes sure the first insn will never be deleted. | |
5674 | Also, final expects a note to appear there. */ | |
5f4f0e22 | 5675 | emit_note (NULL_PTR, NOTE_INSN_DELETED); |
6f086dfc RS |
5676 | |
5677 | /* Set flags used by final.c. */ | |
5678 | if (aggregate_value_p (DECL_RESULT (subr))) | |
5679 | { | |
5680 | #ifdef PCC_STATIC_STRUCT_RETURN | |
1b8297c1 | 5681 | current_function_returns_pcc_struct = 1; |
6f086dfc | 5682 | #endif |
1b8297c1 | 5683 | current_function_returns_struct = 1; |
6f086dfc RS |
5684 | } |
5685 | ||
5686 | /* Warn if this value is an aggregate type, | |
5687 | regardless of which calling convention we are using for it. */ | |
5688 | if (warn_aggregate_return | |
05e3bdb9 | 5689 | && AGGREGATE_TYPE_P (TREE_TYPE (DECL_RESULT (subr)))) |
6f086dfc RS |
5690 | warning ("function returns an aggregate"); |
5691 | ||
5692 | current_function_returns_pointer | |
8eda074c | 5693 | = POINTER_TYPE_P (TREE_TYPE (DECL_RESULT (subr))); |
49ad7cfa | 5694 | } |
5c7675e9 | 5695 | |
49ad7cfa BS |
5696 | /* Make sure all values used by the optimization passes have sane |
5697 | defaults. */ | |
5698 | void | |
5699 | init_function_for_compilation () | |
5700 | { | |
5701 | reg_renumber = 0; | |
5c7675e9 RH |
5702 | /* No prologue/epilogue insns yet. */ |
5703 | prologue = epilogue = 0; | |
6f086dfc RS |
5704 | } |
5705 | ||
5706 | /* Indicate that the current function uses extra args | |
5707 | not explicitly mentioned in the argument list in any fashion. */ | |
5708 | ||
5709 | void | |
5710 | mark_varargs () | |
5711 | { | |
5712 | current_function_varargs = 1; | |
5713 | } | |
5714 | ||
5715 | /* Expand a call to __main at the beginning of a possible main function. */ | |
5716 | ||
e2fd1d94 JM |
5717 | #if defined(INIT_SECTION_ASM_OP) && !defined(INVOKE__main) |
5718 | #undef HAS_INIT_SECTION | |
5719 | #define HAS_INIT_SECTION | |
5720 | #endif | |
5721 | ||
6f086dfc RS |
5722 | void |
5723 | expand_main_function () | |
5724 | { | |
e2fd1d94 | 5725 | #if !defined (HAS_INIT_SECTION) |
b93a436e JL |
5726 | emit_library_call (gen_rtx_SYMBOL_REF (Pmode, NAME__MAIN), 0, |
5727 | VOIDmode, 0); | |
e2fd1d94 | 5728 | #endif /* not HAS_INIT_SECTION */ |
6f086dfc RS |
5729 | } |
5730 | \f | |
c20bf1f3 JB |
5731 | extern struct obstack permanent_obstack; |
5732 | ||
6f086dfc RS |
5733 | /* Start the RTL for a new function, and set variables used for |
5734 | emitting RTL. | |
5735 | SUBR is the FUNCTION_DECL node. | |
5736 | PARMS_HAVE_CLEANUPS is nonzero if there are cleanups associated with | |
5737 | the function's parameters, which must be run at any return statement. */ | |
5738 | ||
5739 | void | |
5740 | expand_function_start (subr, parms_have_cleanups) | |
5741 | tree subr; | |
5742 | int parms_have_cleanups; | |
5743 | { | |
5744 | register int i; | |
5745 | tree tem; | |
4e86caed | 5746 | rtx last_ptr = NULL_RTX; |
6f086dfc RS |
5747 | |
5748 | /* Make sure volatile mem refs aren't considered | |
5749 | valid operands of arithmetic insns. */ | |
5750 | init_recog_no_volatile (); | |
5751 | ||
7d384cc0 KR |
5752 | /* Set this before generating any memory accesses. */ |
5753 | current_function_check_memory_usage | |
5754 | = (flag_check_memory_usage | |
5755 | && ! DECL_NO_CHECK_MEMORY_USAGE (current_function_decl)); | |
5756 | ||
07417085 KR |
5757 | current_function_instrument_entry_exit |
5758 | = (flag_instrument_function_entry_exit | |
5759 | && ! DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (subr)); | |
5760 | ||
6f086dfc RS |
5761 | /* If function gets a static chain arg, store it in the stack frame. |
5762 | Do this first, so it gets the first stack slot offset. */ | |
5763 | if (current_function_needs_context) | |
3e2481e9 JW |
5764 | { |
5765 | last_ptr = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0); | |
f0c51a1e | 5766 | |
f0c51a1e RK |
5767 | /* Delay copying static chain if it is not a register to avoid |
5768 | conflicts with regs used for parameters. */ | |
f95182a4 ILT |
5769 | if (! SMALL_REGISTER_CLASSES |
5770 | || GET_CODE (static_chain_incoming_rtx) == REG) | |
f0c51a1e | 5771 | emit_move_insn (last_ptr, static_chain_incoming_rtx); |
3e2481e9 | 5772 | } |
6f086dfc RS |
5773 | |
5774 | /* If the parameters of this function need cleaning up, get a label | |
5775 | for the beginning of the code which executes those cleanups. This must | |
5776 | be done before doing anything with return_label. */ | |
5777 | if (parms_have_cleanups) | |
5778 | cleanup_label = gen_label_rtx (); | |
5779 | else | |
5780 | cleanup_label = 0; | |
5781 | ||
5782 | /* Make the label for return statements to jump to, if this machine | |
5783 | does not have a one-instruction return and uses an epilogue, | |
5784 | or if it returns a structure, or if it has parm cleanups. */ | |
5785 | #ifdef HAVE_return | |
5786 | if (cleanup_label == 0 && HAVE_return | |
07417085 | 5787 | && ! current_function_instrument_entry_exit |
6f086dfc RS |
5788 | && ! current_function_returns_pcc_struct |
5789 | && ! (current_function_returns_struct && ! optimize)) | |
5790 | return_label = 0; | |
5791 | else | |
5792 | return_label = gen_label_rtx (); | |
5793 | #else | |
5794 | return_label = gen_label_rtx (); | |
5795 | #endif | |
5796 | ||
5797 | /* Initialize rtx used to return the value. */ | |
5798 | /* Do this before assign_parms so that we copy the struct value address | |
5799 | before any library calls that assign parms might generate. */ | |
5800 | ||
5801 | /* Decide whether to return the value in memory or in a register. */ | |
5802 | if (aggregate_value_p (DECL_RESULT (subr))) | |
5803 | { | |
5804 | /* Returning something that won't go in a register. */ | |
4acc00bf | 5805 | register rtx value_address = 0; |
6f086dfc RS |
5806 | |
5807 | #ifdef PCC_STATIC_STRUCT_RETURN | |
5808 | if (current_function_returns_pcc_struct) | |
5809 | { | |
5810 | int size = int_size_in_bytes (TREE_TYPE (DECL_RESULT (subr))); | |
5811 | value_address = assemble_static_space (size); | |
5812 | } | |
5813 | else | |
5814 | #endif | |
5815 | { | |
5816 | /* Expect to be passed the address of a place to store the value. | |
5817 | If it is passed as an argument, assign_parms will take care of | |
5818 | it. */ | |
5819 | if (struct_value_incoming_rtx) | |
5820 | { | |
5821 | value_address = gen_reg_rtx (Pmode); | |
5822 | emit_move_insn (value_address, struct_value_incoming_rtx); | |
5823 | } | |
5824 | } | |
5825 | if (value_address) | |
ccdecf58 RK |
5826 | { |
5827 | DECL_RTL (DECL_RESULT (subr)) | |
38a448ca | 5828 | = gen_rtx_MEM (DECL_MODE (DECL_RESULT (subr)), value_address); |
c6df88cb MM |
5829 | MEM_SET_IN_STRUCT_P (DECL_RTL (DECL_RESULT (subr)), |
5830 | AGGREGATE_TYPE_P (TREE_TYPE | |
5831 | (DECL_RESULT | |
5832 | (subr)))); | |
ccdecf58 | 5833 | } |
6f086dfc RS |
5834 | } |
5835 | else if (DECL_MODE (DECL_RESULT (subr)) == VOIDmode) | |
5836 | /* If return mode is void, this decl rtl should not be used. */ | |
5837 | DECL_RTL (DECL_RESULT (subr)) = 0; | |
07417085 | 5838 | else if (parms_have_cleanups || current_function_instrument_entry_exit) |
a53e14c0 RK |
5839 | { |
5840 | /* If function will end with cleanup code for parms, | |
5841 | compute the return values into a pseudo reg, | |
5842 | which we will copy into the true return register | |
5843 | after the cleanups are done. */ | |
5844 | ||
5845 | enum machine_mode mode = DECL_MODE (DECL_RESULT (subr)); | |
a5a52dbc | 5846 | |
a53e14c0 RK |
5847 | #ifdef PROMOTE_FUNCTION_RETURN |
5848 | tree type = TREE_TYPE (DECL_RESULT (subr)); | |
5849 | int unsignedp = TREE_UNSIGNED (type); | |
5850 | ||
a5a52dbc | 5851 | mode = promote_mode (type, mode, &unsignedp, 1); |
a53e14c0 RK |
5852 | #endif |
5853 | ||
5854 | DECL_RTL (DECL_RESULT (subr)) = gen_reg_rtx (mode); | |
5855 | } | |
6f086dfc RS |
5856 | else |
5857 | /* Scalar, returned in a register. */ | |
5858 | { | |
5859 | #ifdef FUNCTION_OUTGOING_VALUE | |
5860 | DECL_RTL (DECL_RESULT (subr)) | |
5861 | = FUNCTION_OUTGOING_VALUE (TREE_TYPE (DECL_RESULT (subr)), subr); | |
5862 | #else | |
5863 | DECL_RTL (DECL_RESULT (subr)) | |
5864 | = FUNCTION_VALUE (TREE_TYPE (DECL_RESULT (subr)), subr); | |
5865 | #endif | |
5866 | ||
5867 | /* Mark this reg as the function's return value. */ | |
5868 | if (GET_CODE (DECL_RTL (DECL_RESULT (subr))) == REG) | |
5869 | { | |
5870 | REG_FUNCTION_VALUE_P (DECL_RTL (DECL_RESULT (subr))) = 1; | |
5871 | /* Needed because we may need to move this to memory | |
5872 | in case it's a named return value whose address is taken. */ | |
a82ad570 | 5873 | DECL_REGISTER (DECL_RESULT (subr)) = 1; |
6f086dfc RS |
5874 | } |
5875 | } | |
5876 | ||
5877 | /* Initialize rtx for parameters and local variables. | |
5878 | In some cases this requires emitting insns. */ | |
5879 | ||
5880 | assign_parms (subr, 0); | |
5881 | ||
f0c51a1e RK |
5882 | /* Copy the static chain now if it wasn't a register. The delay is to |
5883 | avoid conflicts with the parameter passing registers. */ | |
5884 | ||
f95182a4 | 5885 | if (SMALL_REGISTER_CLASSES && current_function_needs_context) |
f0c51a1e RK |
5886 | if (GET_CODE (static_chain_incoming_rtx) != REG) |
5887 | emit_move_insn (last_ptr, static_chain_incoming_rtx); | |
f0c51a1e | 5888 | |
6f086dfc RS |
5889 | /* The following was moved from init_function_start. |
5890 | The move is supposed to make sdb output more accurate. */ | |
5891 | /* Indicate the beginning of the function body, | |
5892 | as opposed to parm setup. */ | |
5f4f0e22 | 5893 | emit_note (NULL_PTR, NOTE_INSN_FUNCTION_BEG); |
6f086dfc RS |
5894 | |
5895 | /* If doing stupid allocation, mark parms as born here. */ | |
5896 | ||
5897 | if (GET_CODE (get_last_insn ()) != NOTE) | |
5f4f0e22 | 5898 | emit_note (NULL_PTR, NOTE_INSN_DELETED); |
6f086dfc RS |
5899 | parm_birth_insn = get_last_insn (); |
5900 | ||
5901 | if (obey_regdecls) | |
5902 | { | |
5903 | for (i = LAST_VIRTUAL_REGISTER + 1; i < max_parm_reg; i++) | |
5904 | use_variable (regno_reg_rtx[i]); | |
5905 | ||
5906 | if (current_function_internal_arg_pointer != virtual_incoming_args_rtx) | |
5907 | use_variable (current_function_internal_arg_pointer); | |
5908 | } | |
5909 | ||
6d7306f7 JM |
5910 | context_display = 0; |
5911 | if (current_function_needs_context) | |
ac9e20f0 | 5912 | { |
6d7306f7 JM |
5913 | /* Fetch static chain values for containing functions. */ |
5914 | tem = decl_function_context (current_function_decl); | |
5915 | /* If not doing stupid register allocation copy the static chain | |
5916 | pointer into a pseudo. If we have small register classes, copy | |
5917 | the value from memory if static_chain_incoming_rtx is a REG. If | |
5918 | we do stupid register allocation, we use the stack address | |
5919 | generated above. */ | |
5920 | if (tem && ! obey_regdecls) | |
5921 | { | |
6d7306f7 JM |
5922 | /* If the static chain originally came in a register, put it back |
5923 | there, then move it out in the next insn. The reason for | |
5924 | this peculiar code is to satisfy function integration. */ | |
f95182a4 ILT |
5925 | if (SMALL_REGISTER_CLASSES |
5926 | && GET_CODE (static_chain_incoming_rtx) == REG) | |
6d7306f7 | 5927 | emit_move_insn (static_chain_incoming_rtx, last_ptr); |
6d7306f7 JM |
5928 | last_ptr = copy_to_reg (static_chain_incoming_rtx); |
5929 | } | |
ac9e20f0 | 5930 | |
6d7306f7 JM |
5931 | while (tem) |
5932 | { | |
5933 | tree rtlexp = make_node (RTL_EXPR); | |
6f086dfc | 5934 | |
6d7306f7 JM |
5935 | RTL_EXPR_RTL (rtlexp) = last_ptr; |
5936 | context_display = tree_cons (tem, rtlexp, context_display); | |
5937 | tem = decl_function_context (tem); | |
5938 | if (tem == 0) | |
5939 | break; | |
5940 | /* Chain thru stack frames, assuming pointer to next lexical frame | |
5941 | is found at the place we always store it. */ | |
6f086dfc | 5942 | #ifdef FRAME_GROWS_DOWNWARD |
6d7306f7 | 5943 | last_ptr = plus_constant (last_ptr, - GET_MODE_SIZE (Pmode)); |
6f086dfc | 5944 | #endif |
38a448ca RH |
5945 | last_ptr = copy_to_reg (gen_rtx_MEM (Pmode, |
5946 | memory_address (Pmode, last_ptr))); | |
6d7306f7 JM |
5947 | |
5948 | /* If we are not optimizing, ensure that we know that this | |
5949 | piece of context is live over the entire function. */ | |
5950 | if (! optimize) | |
38a448ca RH |
5951 | save_expr_regs = gen_rtx_EXPR_LIST (VOIDmode, last_ptr, |
5952 | save_expr_regs); | |
6d7306f7 | 5953 | } |
6f086dfc RS |
5954 | } |
5955 | ||
07417085 KR |
5956 | if (current_function_instrument_entry_exit) |
5957 | { | |
5958 | rtx fun = DECL_RTL (current_function_decl); | |
5959 | if (GET_CODE (fun) == MEM) | |
5960 | fun = XEXP (fun, 0); | |
5961 | else | |
5962 | abort (); | |
5963 | emit_library_call (profile_function_entry_libfunc, 0, VOIDmode, 2, | |
5964 | fun, Pmode, | |
5965 | expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS, | |
5966 | 0, | |
5967 | hard_frame_pointer_rtx), | |
5968 | Pmode); | |
5969 | } | |
5970 | ||
6f086dfc RS |
5971 | /* After the display initializations is where the tail-recursion label |
5972 | should go, if we end up needing one. Ensure we have a NOTE here | |
5973 | since some things (like trampolines) get placed before this. */ | |
5f4f0e22 | 5974 | tail_recursion_reentry = emit_note (NULL_PTR, NOTE_INSN_DELETED); |
6f086dfc RS |
5975 | |
5976 | /* Evaluate now the sizes of any types declared among the arguments. */ | |
5977 | for (tem = nreverse (get_pending_sizes ()); tem; tem = TREE_CHAIN (tem)) | |
7b05e286 | 5978 | { |
86fa911a RK |
5979 | expand_expr (TREE_VALUE (tem), const0_rtx, VOIDmode, |
5980 | EXPAND_MEMORY_USE_BAD); | |
7b05e286 JW |
5981 | /* Flush the queue in case this parameter declaration has |
5982 | side-effects. */ | |
5983 | emit_queue (); | |
5984 | } | |
6f086dfc RS |
5985 | |
5986 | /* Make sure there is a line number after the function entry setup code. */ | |
5987 | force_next_line_note (); | |
5988 | } | |
5989 | \f | |
49ad7cfa BS |
5990 | /* Undo the effects of init_dummy_function_start. */ |
5991 | void | |
5992 | expand_dummy_function_end () | |
5993 | { | |
5994 | /* End any sequences that failed to be closed due to syntax errors. */ | |
5995 | while (in_sequence_p ()) | |
5996 | end_sequence (); | |
5997 | ||
5998 | /* Outside function body, can't compute type's actual size | |
5999 | until next function's body starts. */ | |
6000 | current_function = 0; | |
6001 | } | |
6002 | ||
6f086dfc | 6003 | /* Generate RTL for the end of the current function. |
980697fd | 6004 | FILENAME and LINE are the current position in the source file. |
6f086dfc | 6005 | |
980697fd | 6006 | It is up to language-specific callers to do cleanups for parameters-- |
1be07046 | 6007 | or else, supply 1 for END_BINDINGS and we will call expand_end_bindings. */ |
6f086dfc RS |
6008 | |
6009 | void | |
1be07046 | 6010 | expand_function_end (filename, line, end_bindings) |
6f086dfc RS |
6011 | char *filename; |
6012 | int line; | |
1be07046 | 6013 | int end_bindings; |
6f086dfc RS |
6014 | { |
6015 | register int i; | |
6016 | tree link; | |
6017 | ||
1e2414db | 6018 | #ifdef TRAMPOLINE_TEMPLATE |
6f086dfc | 6019 | static rtx initial_trampoline; |
1e2414db | 6020 | #endif |
6f086dfc | 6021 | |
49ad7cfa BS |
6022 | finish_expr_for_function (); |
6023 | ||
6f086dfc RS |
6024 | #ifdef NON_SAVING_SETJMP |
6025 | /* Don't put any variables in registers if we call setjmp | |
6026 | on a machine that fails to restore the registers. */ | |
6027 | if (NON_SAVING_SETJMP && current_function_calls_setjmp) | |
6028 | { | |
b88a3142 RK |
6029 | if (DECL_INITIAL (current_function_decl) != error_mark_node) |
6030 | setjmp_protect (DECL_INITIAL (current_function_decl)); | |
6031 | ||
6f086dfc RS |
6032 | setjmp_protect_args (); |
6033 | } | |
6034 | #endif | |
6035 | ||
6036 | /* Save the argument pointer if a save area was made for it. */ | |
6037 | if (arg_pointer_save_area) | |
6038 | { | |
ea0f9a85 JW |
6039 | /* arg_pointer_save_area may not be a valid memory address, so we |
6040 | have to check it and fix it if necessary. */ | |
6041 | rtx seq; | |
6042 | start_sequence (); | |
6043 | emit_move_insn (validize_mem (arg_pointer_save_area), | |
6044 | virtual_incoming_args_rtx); | |
6045 | seq = gen_sequence (); | |
6046 | end_sequence (); | |
6047 | emit_insn_before (seq, tail_recursion_reentry); | |
6f086dfc RS |
6048 | } |
6049 | ||
6050 | /* Initialize any trampolines required by this function. */ | |
6051 | for (link = trampoline_list; link; link = TREE_CHAIN (link)) | |
6052 | { | |
6053 | tree function = TREE_PURPOSE (link); | |
6054 | rtx context = lookup_static_chain (function); | |
6055 | rtx tramp = RTL_EXPR_RTL (TREE_VALUE (link)); | |
7a87758d | 6056 | #ifdef TRAMPOLINE_TEMPLATE |
1e2414db | 6057 | rtx blktramp; |
7a87758d | 6058 | #endif |
6f086dfc RS |
6059 | rtx seq; |
6060 | ||
1e2414db | 6061 | #ifdef TRAMPOLINE_TEMPLATE |
6f086dfc RS |
6062 | /* First make sure this compilation has a template for |
6063 | initializing trampolines. */ | |
6064 | if (initial_trampoline == 0) | |
86f8eff3 RK |
6065 | { |
6066 | end_temporary_allocation (); | |
6067 | initial_trampoline | |
38a448ca | 6068 | = gen_rtx_MEM (BLKmode, assemble_trampoline_template ()); |
86f8eff3 RK |
6069 | resume_temporary_allocation (); |
6070 | } | |
1e2414db | 6071 | #endif |
6f086dfc RS |
6072 | |
6073 | /* Generate insns to initialize the trampoline. */ | |
6074 | start_sequence (); | |
1e2414db RK |
6075 | tramp = round_trampoline_addr (XEXP (tramp, 0)); |
6076 | #ifdef TRAMPOLINE_TEMPLATE | |
6077 | blktramp = change_address (initial_trampoline, BLKmode, tramp); | |
6078 | emit_block_move (blktramp, initial_trampoline, | |
6079 | GEN_INT (TRAMPOLINE_SIZE), | |
189cc377 | 6080 | TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT); |
1e2414db RK |
6081 | #endif |
6082 | INITIALIZE_TRAMPOLINE (tramp, XEXP (DECL_RTL (function), 0), context); | |
6f086dfc RS |
6083 | seq = get_insns (); |
6084 | end_sequence (); | |
6085 | ||
6086 | /* Put those insns at entry to the containing function (this one). */ | |
6087 | emit_insns_before (seq, tail_recursion_reentry); | |
6088 | } | |
6f086dfc | 6089 | |
11044f66 RK |
6090 | /* If we are doing stack checking and this function makes calls, |
6091 | do a stack probe at the start of the function to ensure we have enough | |
6092 | space for another stack frame. */ | |
6093 | if (flag_stack_check && ! STACK_CHECK_BUILTIN) | |
6094 | { | |
6095 | rtx insn, seq; | |
6096 | ||
6097 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
6098 | if (GET_CODE (insn) == CALL_INSN) | |
6099 | { | |
6100 | start_sequence (); | |
6101 | probe_stack_range (STACK_CHECK_PROTECT, | |
6102 | GEN_INT (STACK_CHECK_MAX_FRAME_SIZE)); | |
6103 | seq = get_insns (); | |
6104 | end_sequence (); | |
6105 | emit_insns_before (seq, tail_recursion_reentry); | |
6106 | break; | |
6107 | } | |
6108 | } | |
6109 | ||
db8717d9 RK |
6110 | /* Warn about unused parms if extra warnings were specified. */ |
6111 | if (warn_unused && extra_warnings) | |
6f086dfc | 6112 | { |
db8717d9 | 6113 | tree decl; |
6f086dfc RS |
6114 | |
6115 | for (decl = DECL_ARGUMENTS (current_function_decl); | |
6116 | decl; decl = TREE_CHAIN (decl)) | |
497dc802 JM |
6117 | if (! TREE_USED (decl) && TREE_CODE (decl) == PARM_DECL |
6118 | && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl)) | |
6f086dfc RS |
6119 | warning_with_decl (decl, "unused parameter `%s'"); |
6120 | } | |
6f086dfc RS |
6121 | |
6122 | /* Delete handlers for nonlocal gotos if nothing uses them. */ | |
ba716ac9 BS |
6123 | if (nonlocal_goto_handler_slots != 0 |
6124 | && ! current_function_has_nonlocal_label) | |
6f086dfc RS |
6125 | delete_handlers (); |
6126 | ||
6127 | /* End any sequences that failed to be closed due to syntax errors. */ | |
6128 | while (in_sequence_p ()) | |
5f4f0e22 | 6129 | end_sequence (); |
6f086dfc RS |
6130 | |
6131 | /* Outside function body, can't compute type's actual size | |
6132 | until next function's body starts. */ | |
6133 | immediate_size_expand--; | |
6134 | ||
6135 | /* If doing stupid register allocation, | |
6136 | mark register parms as dying here. */ | |
6137 | ||
6138 | if (obey_regdecls) | |
6139 | { | |
6140 | rtx tem; | |
6141 | for (i = LAST_VIRTUAL_REGISTER + 1; i < max_parm_reg; i++) | |
6142 | use_variable (regno_reg_rtx[i]); | |
6143 | ||
6144 | /* Likewise for the regs of all the SAVE_EXPRs in the function. */ | |
6145 | ||
6146 | for (tem = save_expr_regs; tem; tem = XEXP (tem, 1)) | |
6147 | { | |
6148 | use_variable (XEXP (tem, 0)); | |
6149 | use_variable_after (XEXP (tem, 0), parm_birth_insn); | |
6150 | } | |
6151 | ||
6152 | if (current_function_internal_arg_pointer != virtual_incoming_args_rtx) | |
6153 | use_variable (current_function_internal_arg_pointer); | |
6154 | } | |
6155 | ||
6156 | clear_pending_stack_adjust (); | |
6157 | do_pending_stack_adjust (); | |
6158 | ||
6159 | /* Mark the end of the function body. | |
6160 | If control reaches this insn, the function can drop through | |
6161 | without returning a value. */ | |
5f4f0e22 | 6162 | emit_note (NULL_PTR, NOTE_INSN_FUNCTION_END); |
6f086dfc | 6163 | |
82e415a3 DE |
6164 | /* Must mark the last line number note in the function, so that the test |
6165 | coverage code can avoid counting the last line twice. This just tells | |
6166 | the code to ignore the immediately following line note, since there | |
6167 | already exists a copy of this note somewhere above. This line number | |
6168 | note is still needed for debugging though, so we can't delete it. */ | |
6169 | if (flag_test_coverage) | |
6170 | emit_note (NULL_PTR, NOTE_REPEATED_LINE_NUMBER); | |
6171 | ||
6f086dfc RS |
6172 | /* Output a linenumber for the end of the function. |
6173 | SDB depends on this. */ | |
6174 | emit_line_note_force (filename, line); | |
6175 | ||
6176 | /* Output the label for the actual return from the function, | |
6177 | if one is expected. This happens either because a function epilogue | |
6178 | is used instead of a return instruction, or because a return was done | |
6179 | with a goto in order to run local cleanups, or because of pcc-style | |
6180 | structure returning. */ | |
6181 | ||
6182 | if (return_label) | |
6183 | emit_label (return_label); | |
6184 | ||
1be07046 RS |
6185 | /* C++ uses this. */ |
6186 | if (end_bindings) | |
6187 | expand_end_bindings (0, 0, 0); | |
6188 | ||
e5a1e0e8 MS |
6189 | /* Now handle any leftover exception regions that may have been |
6190 | created for the parameters. */ | |
6191 | { | |
6192 | rtx last = get_last_insn (); | |
6193 | rtx label; | |
6194 | ||
6195 | expand_leftover_cleanups (); | |
6196 | ||
6197 | /* If the above emitted any code, may sure we jump around it. */ | |
6198 | if (last != get_last_insn ()) | |
6199 | { | |
6200 | label = gen_label_rtx (); | |
6201 | last = emit_jump_insn_after (gen_jump (label), last); | |
6202 | last = emit_barrier_after (last); | |
6203 | emit_label (label); | |
6204 | } | |
6205 | } | |
6206 | ||
07417085 KR |
6207 | if (current_function_instrument_entry_exit) |
6208 | { | |
6209 | rtx fun = DECL_RTL (current_function_decl); | |
6210 | if (GET_CODE (fun) == MEM) | |
6211 | fun = XEXP (fun, 0); | |
6212 | else | |
6213 | abort (); | |
6214 | emit_library_call (profile_function_exit_libfunc, 0, VOIDmode, 2, | |
6215 | fun, Pmode, | |
6216 | expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS, | |
6217 | 0, | |
6218 | hard_frame_pointer_rtx), | |
6219 | Pmode); | |
6220 | } | |
6221 | ||
6f086dfc RS |
6222 | /* If we had calls to alloca, and this machine needs |
6223 | an accurate stack pointer to exit the function, | |
6224 | insert some code to save and restore the stack pointer. */ | |
6225 | #ifdef EXIT_IGNORE_STACK | |
6226 | if (! EXIT_IGNORE_STACK) | |
6227 | #endif | |
6228 | if (current_function_calls_alloca) | |
6229 | { | |
59257ff7 RK |
6230 | rtx tem = 0; |
6231 | ||
6232 | emit_stack_save (SAVE_FUNCTION, &tem, parm_birth_insn); | |
5f4f0e22 | 6233 | emit_stack_restore (SAVE_FUNCTION, tem, NULL_RTX); |
6f086dfc RS |
6234 | } |
6235 | ||
6236 | /* If scalar return value was computed in a pseudo-reg, | |
6237 | copy that to the hard return register. */ | |
6238 | if (DECL_RTL (DECL_RESULT (current_function_decl)) != 0 | |
6239 | && GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) == REG | |
6240 | && (REGNO (DECL_RTL (DECL_RESULT (current_function_decl))) | |
6241 | >= FIRST_PSEUDO_REGISTER)) | |
6242 | { | |
6243 | rtx real_decl_result; | |
6244 | ||
6245 | #ifdef FUNCTION_OUTGOING_VALUE | |
6246 | real_decl_result | |
6247 | = FUNCTION_OUTGOING_VALUE (TREE_TYPE (DECL_RESULT (current_function_decl)), | |
6248 | current_function_decl); | |
6249 | #else | |
6250 | real_decl_result | |
6251 | = FUNCTION_VALUE (TREE_TYPE (DECL_RESULT (current_function_decl)), | |
6252 | current_function_decl); | |
6253 | #endif | |
6254 | REG_FUNCTION_VALUE_P (real_decl_result) = 1; | |
ecec4441 JW |
6255 | /* If this is a BLKmode structure being returned in registers, then use |
6256 | the mode computed in expand_return. */ | |
6257 | if (GET_MODE (real_decl_result) == BLKmode) | |
6258 | PUT_MODE (real_decl_result, | |
6259 | GET_MODE (DECL_RTL (DECL_RESULT (current_function_decl)))); | |
6f086dfc RS |
6260 | emit_move_insn (real_decl_result, |
6261 | DECL_RTL (DECL_RESULT (current_function_decl))); | |
38a448ca | 6262 | emit_insn (gen_rtx_USE (VOIDmode, real_decl_result)); |
f345de42 JL |
6263 | |
6264 | /* The delay slot scheduler assumes that current_function_return_rtx | |
6265 | holds the hard register containing the return value, not a temporary | |
6266 | pseudo. */ | |
6267 | current_function_return_rtx = real_decl_result; | |
6f086dfc RS |
6268 | } |
6269 | ||
6270 | /* If returning a structure, arrange to return the address of the value | |
6271 | in a place where debuggers expect to find it. | |
6272 | ||
6273 | If returning a structure PCC style, | |
6274 | the caller also depends on this value. | |
6275 | And current_function_returns_pcc_struct is not necessarily set. */ | |
6276 | if (current_function_returns_struct | |
6277 | || current_function_returns_pcc_struct) | |
6278 | { | |
6279 | rtx value_address = XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0); | |
6280 | tree type = TREE_TYPE (DECL_RESULT (current_function_decl)); | |
6281 | #ifdef FUNCTION_OUTGOING_VALUE | |
6282 | rtx outgoing | |
6283 | = FUNCTION_OUTGOING_VALUE (build_pointer_type (type), | |
6284 | current_function_decl); | |
6285 | #else | |
6286 | rtx outgoing | |
6287 | = FUNCTION_VALUE (build_pointer_type (type), | |
6288 | current_function_decl); | |
6289 | #endif | |
6290 | ||
6291 | /* Mark this as a function return value so integrate will delete the | |
6292 | assignment and USE below when inlining this function. */ | |
6293 | REG_FUNCTION_VALUE_P (outgoing) = 1; | |
6294 | ||
6295 | emit_move_insn (outgoing, value_address); | |
6296 | use_variable (outgoing); | |
6297 | } | |
6298 | ||
71038426 RH |
6299 | /* If this is an implementation of __throw, do what's necessary to |
6300 | communicate between __builtin_eh_return and the epilogue. */ | |
6301 | expand_eh_return (); | |
6302 | ||
6f086dfc RS |
6303 | /* Output a return insn if we are using one. |
6304 | Otherwise, let the rtl chain end here, to drop through | |
6305 | into the epilogue. */ | |
6306 | ||
6307 | #ifdef HAVE_return | |
6308 | if (HAVE_return) | |
6309 | { | |
6310 | emit_jump_insn (gen_return ()); | |
6311 | emit_barrier (); | |
6312 | } | |
6313 | #endif | |
6314 | ||
6315 | /* Fix up any gotos that jumped out to the outermost | |
6316 | binding level of the function. | |
6317 | Must follow emitting RETURN_LABEL. */ | |
6318 | ||
6319 | /* If you have any cleanups to do at this point, | |
6320 | and they need to create temporary variables, | |
6321 | then you will lose. */ | |
e15679f8 | 6322 | expand_fixups (get_insns ()); |
6f086dfc | 6323 | } |
bdac5f58 | 6324 | \f |
bdac5f58 TW |
6325 | /* Create an array that records the INSN_UIDs of INSNS (either a sequence |
6326 | or a single insn). */ | |
6327 | ||
487a6e06 | 6328 | #if defined (HAVE_prologue) || defined (HAVE_epilogue) |
bdac5f58 TW |
6329 | static int * |
6330 | record_insns (insns) | |
6331 | rtx insns; | |
6332 | { | |
6333 | int *vec; | |
6334 | ||
6335 | if (GET_CODE (insns) == SEQUENCE) | |
6336 | { | |
6337 | int len = XVECLEN (insns, 0); | |
6338 | vec = (int *) oballoc ((len + 1) * sizeof (int)); | |
6339 | vec[len] = 0; | |
6340 | while (--len >= 0) | |
6341 | vec[len] = INSN_UID (XVECEXP (insns, 0, len)); | |
6342 | } | |
6343 | else | |
6344 | { | |
6345 | vec = (int *) oballoc (2 * sizeof (int)); | |
6346 | vec[0] = INSN_UID (insns); | |
6347 | vec[1] = 0; | |
6348 | } | |
6349 | return vec; | |
6350 | } | |
6351 | ||
10914065 | 6352 | /* Determine how many INSN_UIDs in VEC are part of INSN. */ |
bdac5f58 | 6353 | |
10914065 | 6354 | static int |
bdac5f58 TW |
6355 | contains (insn, vec) |
6356 | rtx insn; | |
6357 | int *vec; | |
6358 | { | |
6359 | register int i, j; | |
6360 | ||
6361 | if (GET_CODE (insn) == INSN | |
6362 | && GET_CODE (PATTERN (insn)) == SEQUENCE) | |
6363 | { | |
10914065 | 6364 | int count = 0; |
bdac5f58 TW |
6365 | for (i = XVECLEN (PATTERN (insn), 0) - 1; i >= 0; i--) |
6366 | for (j = 0; vec[j]; j++) | |
6367 | if (INSN_UID (XVECEXP (PATTERN (insn), 0, i)) == vec[j]) | |
10914065 TW |
6368 | count++; |
6369 | return count; | |
bdac5f58 TW |
6370 | } |
6371 | else | |
6372 | { | |
6373 | for (j = 0; vec[j]; j++) | |
6374 | if (INSN_UID (insn) == vec[j]) | |
10914065 | 6375 | return 1; |
bdac5f58 TW |
6376 | } |
6377 | return 0; | |
6378 | } | |
5c7675e9 RH |
6379 | |
6380 | int | |
6381 | prologue_epilogue_contains (insn) | |
6382 | rtx insn; | |
6383 | { | |
6384 | if (prologue && contains (insn, prologue)) | |
6385 | return 1; | |
6386 | if (epilogue && contains (insn, epilogue)) | |
6387 | return 1; | |
6388 | return 0; | |
6389 | } | |
081f5e7e | 6390 | #endif /* HAVE_prologue || HAVE_epilogue */ |
bdac5f58 | 6391 | |
9faa82d8 | 6392 | /* Generate the prologue and epilogue RTL if the machine supports it. Thread |
bdac5f58 TW |
6393 | this into place with notes indicating where the prologue ends and where |
6394 | the epilogue begins. Update the basic block information when possible. */ | |
6395 | ||
6396 | void | |
6397 | thread_prologue_and_epilogue_insns (f) | |
54ea1de9 | 6398 | rtx f ATTRIBUTE_UNUSED; |
bdac5f58 | 6399 | { |
e881bb1b RH |
6400 | int insertted = 0; |
6401 | ||
bdac5f58 TW |
6402 | #ifdef HAVE_prologue |
6403 | if (HAVE_prologue) | |
6404 | { | |
e881bb1b | 6405 | rtx seq; |
bdac5f58 | 6406 | |
e881bb1b RH |
6407 | start_sequence (); |
6408 | seq = gen_prologue(); | |
6409 | emit_insn (seq); | |
bdac5f58 TW |
6410 | |
6411 | /* Retain a map of the prologue insns. */ | |
e881bb1b RH |
6412 | if (GET_CODE (seq) != SEQUENCE) |
6413 | seq = get_insns (); | |
6414 | prologue = record_insns (seq); | |
6415 | ||
6416 | emit_note (NULL, NOTE_INSN_PROLOGUE_END); | |
6417 | seq = gen_sequence (); | |
6418 | end_sequence (); | |
6419 | ||
6420 | /* If optimization is off, and perhaps in an empty function, | |
6421 | the entry block will have no successors. */ | |
6422 | if (ENTRY_BLOCK_PTR->succ) | |
6423 | { | |
6424 | /* Can't deal with multiple successsors of the entry block. */ | |
6425 | if (ENTRY_BLOCK_PTR->succ->succ_next) | |
6426 | abort (); | |
6427 | ||
6428 | insert_insn_on_edge (seq, ENTRY_BLOCK_PTR->succ); | |
6429 | insertted = 1; | |
6430 | } | |
6431 | else | |
6432 | emit_insn_after (seq, f); | |
bdac5f58 | 6433 | } |
bdac5f58 | 6434 | #endif |
bdac5f58 TW |
6435 | |
6436 | #ifdef HAVE_epilogue | |
6437 | if (HAVE_epilogue) | |
6438 | { | |
e881bb1b RH |
6439 | edge e; |
6440 | basic_block bb = 0; | |
6441 | rtx tail = get_last_insn (); | |
6442 | ||
6443 | /* ??? This is gastly. If function returns were not done via uses, | |
6444 | but via mark_regs_live_at_end, we could use insert_insn_on_edge | |
6445 | and all of this uglyness would go away. */ | |
bdac5f58 | 6446 | |
e881bb1b | 6447 | switch (optimize) |
bdac5f58 | 6448 | { |
e881bb1b RH |
6449 | default: |
6450 | /* If the exit block has no non-fake predecessors, we don't | |
6451 | need an epilogue. Furthermore, only pay attention to the | |
6452 | fallthru predecessors; if (conditional) return insns were | |
6453 | generated, by definition we do not need to emit epilogue | |
6454 | insns. */ | |
6455 | ||
6456 | for (e = EXIT_BLOCK_PTR->pred; e ; e = e->pred_next) | |
6457 | if ((e->flags & EDGE_FAKE) == 0 | |
6458 | && (e->flags & EDGE_FALLTHRU) != 0) | |
6459 | break; | |
6460 | if (e == NULL) | |
6461 | break; | |
6462 | ||
6463 | /* We can't handle multiple epilogues -- if one is needed, | |
6464 | we won't be able to place it multiple times. | |
6465 | ||
6466 | ??? Fix epilogue expanders to not assume they are the | |
6467 | last thing done compiling the function. Either that | |
6468 | or copy_rtx each insn. | |
6469 | ||
6470 | ??? Blah, it's not a simple expression to assert that | |
6471 | we've exactly one fallthru exit edge. */ | |
6472 | ||
6473 | bb = e->src; | |
6474 | tail = bb->end; | |
6475 | ||
6476 | /* ??? If the last insn of the basic block is a jump, then we | |
6477 | are creating a new basic block. Wimp out and leave these | |
6478 | insns outside any block. */ | |
6479 | if (GET_CODE (tail) == JUMP_INSN) | |
6480 | bb = 0; | |
6481 | ||
6482 | /* FALLTHRU */ | |
6483 | case 0: | |
6484 | { | |
6485 | rtx prev, seq, first_use; | |
6486 | ||
6487 | /* Move the USE insns at the end of a function onto a list. */ | |
6488 | prev = tail; | |
6489 | if (GET_CODE (prev) == BARRIER | |
6490 | || GET_CODE (prev) == NOTE) | |
bdac5f58 | 6491 | prev = prev_nonnote_insn (prev); |
a78bdb38 | 6492 | |
e881bb1b RH |
6493 | first_use = 0; |
6494 | if (prev | |
6495 | && GET_CODE (prev) == INSN | |
6496 | && GET_CODE (PATTERN (prev)) == USE) | |
6497 | { | |
6498 | /* If the end of the block is the use, grab hold of something | |
6499 | else so that we emit barriers etc in the right place. */ | |
6500 | if (prev == tail) | |
6501 | { | |
6502 | do | |
6503 | tail = PREV_INSN (tail); | |
6504 | while (GET_CODE (tail) == INSN | |
6505 | && GET_CODE (PATTERN (tail)) == USE); | |
6506 | } | |
bdac5f58 | 6507 | |
e881bb1b RH |
6508 | do |
6509 | { | |
6510 | rtx use = prev; | |
6511 | prev = prev_nonnote_insn (prev); | |
6512 | ||
6513 | remove_insn (use); | |
6514 | if (first_use) | |
6515 | { | |
6516 | NEXT_INSN (use) = first_use; | |
6517 | PREV_INSN (first_use) = use; | |
6518 | } | |
6519 | else | |
6520 | NEXT_INSN (use) = NULL_RTX; | |
6521 | first_use = use; | |
6522 | } | |
6523 | while (prev | |
6524 | && GET_CODE (prev) == INSN | |
6525 | && GET_CODE (PATTERN (prev)) == USE); | |
6526 | } | |
a78bdb38 | 6527 | |
e881bb1b RH |
6528 | /* The last basic block ends with a NOTE_INSN_EPILOGUE_BEG, the |
6529 | epilogue insns, the USE insns at the end of a function, | |
6530 | the jump insn that returns, and then a BARRIER. */ | |
a78bdb38 | 6531 | |
e881bb1b RH |
6532 | if (GET_CODE (tail) != BARRIER) |
6533 | { | |
6534 | prev = next_nonnote_insn (tail); | |
6535 | if (!prev || GET_CODE (prev) != BARRIER) | |
6536 | emit_barrier_after (tail); | |
6537 | } | |
a78bdb38 | 6538 | |
e881bb1b RH |
6539 | seq = gen_epilogue (); |
6540 | prev = tail; | |
6541 | tail = emit_jump_insn_after (seq, tail); | |
bdac5f58 | 6542 | |
e881bb1b RH |
6543 | /* Insert the USE insns immediately before the return insn, which |
6544 | must be the last instruction emitted in the sequence. */ | |
6545 | if (first_use) | |
6546 | emit_insns_before (first_use, tail); | |
6547 | emit_note_after (NOTE_INSN_EPILOGUE_BEG, prev); | |
bdac5f58 | 6548 | |
e881bb1b RH |
6549 | /* Update the tail of the basic block. */ |
6550 | if (bb) | |
6551 | bb->end = tail; | |
6552 | ||
6553 | /* Retain a map of the epilogue insns. */ | |
6554 | epilogue = record_insns (GET_CODE (seq) == SEQUENCE ? seq : tail); | |
6555 | } | |
bdac5f58 TW |
6556 | } |
6557 | } | |
6558 | #endif | |
e881bb1b RH |
6559 | |
6560 | if (insertted) | |
6561 | commit_edge_insertions (); | |
bdac5f58 TW |
6562 | } |
6563 | ||
6564 | /* Reposition the prologue-end and epilogue-begin notes after instruction | |
6565 | scheduling and delayed branch scheduling. */ | |
6566 | ||
6567 | void | |
6568 | reposition_prologue_and_epilogue_notes (f) | |
79c9824e | 6569 | rtx f ATTRIBUTE_UNUSED; |
bdac5f58 TW |
6570 | { |
6571 | #if defined (HAVE_prologue) || defined (HAVE_epilogue) | |
6572 | /* Reposition the prologue and epilogue notes. */ | |
6573 | if (n_basic_blocks) | |
6574 | { | |
bf526252 | 6575 | int len; |
bdac5f58 TW |
6576 | |
6577 | if (prologue) | |
6578 | { | |
bf526252 RK |
6579 | register rtx insn, note = 0; |
6580 | ||
6581 | /* Scan from the beginning until we reach the last prologue insn. | |
6582 | We apparently can't depend on basic_block_{head,end} after | |
6583 | reorg has run. */ | |
6584 | for (len = 0; prologue[len]; len++) | |
6585 | ; | |
9392c110 JH |
6586 | for (insn = f; len && insn; insn = NEXT_INSN (insn)) |
6587 | { | |
6588 | if (GET_CODE (insn) == NOTE) | |
6589 | { | |
6590 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_PROLOGUE_END) | |
6591 | note = insn; | |
6592 | } | |
6593 | else if ((len -= contains (insn, prologue)) == 0) | |
6594 | { | |
89e99eea | 6595 | rtx next; |
9392c110 JH |
6596 | /* Find the prologue-end note if we haven't already, and |
6597 | move it to just after the last prologue insn. */ | |
6598 | if (note == 0) | |
6599 | { | |
51723711 | 6600 | for (note = insn; (note = NEXT_INSN (note));) |
9392c110 JH |
6601 | if (GET_CODE (note) == NOTE |
6602 | && NOTE_LINE_NUMBER (note) == NOTE_INSN_PROLOGUE_END) | |
6603 | break; | |
6604 | } | |
c93b03c2 | 6605 | |
9392c110 | 6606 | next = NEXT_INSN (note); |
c93b03c2 | 6607 | |
3b413743 | 6608 | /* Whether or not we can depend on BLOCK_HEAD, |
c93b03c2 | 6609 | attempt to keep it up-to-date. */ |
3b413743 RH |
6610 | if (BLOCK_HEAD (0) == note) |
6611 | BLOCK_HEAD (0) = next; | |
c93b03c2 | 6612 | |
89e99eea | 6613 | remove_insn (note); |
9392c110 JH |
6614 | add_insn_after (note, insn); |
6615 | } | |
6616 | } | |
bdac5f58 TW |
6617 | } |
6618 | ||
6619 | if (epilogue) | |
6620 | { | |
bf526252 RK |
6621 | register rtx insn, note = 0; |
6622 | ||
6623 | /* Scan from the end until we reach the first epilogue insn. | |
6624 | We apparently can't depend on basic_block_{head,end} after | |
6625 | reorg has run. */ | |
6626 | for (len = 0; epilogue[len]; len++) | |
6627 | ; | |
9392c110 JH |
6628 | for (insn = get_last_insn (); len && insn; insn = PREV_INSN (insn)) |
6629 | { | |
6630 | if (GET_CODE (insn) == NOTE) | |
6631 | { | |
6632 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_EPILOGUE_BEG) | |
6633 | note = insn; | |
6634 | } | |
6635 | else if ((len -= contains (insn, epilogue)) == 0) | |
6636 | { | |
6637 | /* Find the epilogue-begin note if we haven't already, and | |
6638 | move it to just before the first epilogue insn. */ | |
6639 | if (note == 0) | |
6640 | { | |
51723711 | 6641 | for (note = insn; (note = PREV_INSN (note));) |
9392c110 JH |
6642 | if (GET_CODE (note) == NOTE |
6643 | && NOTE_LINE_NUMBER (note) == NOTE_INSN_EPILOGUE_BEG) | |
6644 | break; | |
6645 | } | |
c93b03c2 | 6646 | |
3b413743 | 6647 | /* Whether or not we can depend on BLOCK_HEAD, |
c93b03c2 RH |
6648 | attempt to keep it up-to-date. */ |
6649 | if (n_basic_blocks | |
3b413743 RH |
6650 | && BLOCK_HEAD (n_basic_blocks-1) == insn) |
6651 | BLOCK_HEAD (n_basic_blocks-1) = note; | |
c93b03c2 | 6652 | |
89e99eea | 6653 | remove_insn (note); |
c93b03c2 | 6654 | add_insn_before (note, insn); |
9392c110 JH |
6655 | } |
6656 | } | |
bdac5f58 TW |
6657 | } |
6658 | } | |
6659 | #endif /* HAVE_prologue or HAVE_epilogue */ | |
6660 | } |