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bbf6f052 | 1 | /* Convert tree expression to rtl instructions, for GNU compiler. |
99310285 | 2 | Copyright (C) 1988, 1992, 1993, 1994 Free Software Foundation, Inc. |
bbf6f052 RK |
3 | |
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU CC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
21 | #include "config.h" | |
ca695ac9 | 22 | #include "machmode.h" |
bbf6f052 RK |
23 | #include "rtl.h" |
24 | #include "tree.h" | |
ca695ac9 | 25 | #include "obstack.h" |
bbf6f052 RK |
26 | #include "flags.h" |
27 | #include "function.h" | |
28 | #include "insn-flags.h" | |
29 | #include "insn-codes.h" | |
30 | #include "expr.h" | |
31 | #include "insn-config.h" | |
32 | #include "recog.h" | |
33 | #include "output.h" | |
bbf6f052 RK |
34 | #include "typeclass.h" |
35 | ||
ca695ac9 JB |
36 | #include "bytecode.h" |
37 | #include "bc-opcode.h" | |
38 | #include "bc-typecd.h" | |
39 | #include "bc-optab.h" | |
40 | #include "bc-emit.h" | |
41 | ||
42 | ||
bbf6f052 RK |
43 | #define CEIL(x,y) (((x) + (y) - 1) / (y)) |
44 | ||
45 | /* Decide whether a function's arguments should be processed | |
bbc8a071 RK |
46 | from first to last or from last to first. |
47 | ||
48 | They should if the stack and args grow in opposite directions, but | |
49 | only if we have push insns. */ | |
bbf6f052 | 50 | |
bbf6f052 | 51 | #ifdef PUSH_ROUNDING |
bbc8a071 | 52 | |
3319a347 | 53 | #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD) |
bbf6f052 RK |
54 | #define PUSH_ARGS_REVERSED /* If it's last to first */ |
55 | #endif | |
bbc8a071 | 56 | |
bbf6f052 RK |
57 | #endif |
58 | ||
59 | #ifndef STACK_PUSH_CODE | |
60 | #ifdef STACK_GROWS_DOWNWARD | |
61 | #define STACK_PUSH_CODE PRE_DEC | |
62 | #else | |
63 | #define STACK_PUSH_CODE PRE_INC | |
64 | #endif | |
65 | #endif | |
66 | ||
67 | /* Like STACK_BOUNDARY but in units of bytes, not bits. */ | |
68 | #define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT) | |
69 | ||
70 | /* If this is nonzero, we do not bother generating VOLATILE | |
71 | around volatile memory references, and we are willing to | |
72 | output indirect addresses. If cse is to follow, we reject | |
73 | indirect addresses so a useful potential cse is generated; | |
74 | if it is used only once, instruction combination will produce | |
75 | the same indirect address eventually. */ | |
76 | int cse_not_expected; | |
77 | ||
78 | /* Nonzero to generate code for all the subroutines within an | |
79 | expression before generating the upper levels of the expression. | |
80 | Nowadays this is never zero. */ | |
81 | int do_preexpand_calls = 1; | |
82 | ||
83 | /* Number of units that we should eventually pop off the stack. | |
84 | These are the arguments to function calls that have already returned. */ | |
85 | int pending_stack_adjust; | |
86 | ||
87 | /* Nonzero means stack pops must not be deferred, and deferred stack | |
88 | pops must not be output. It is nonzero inside a function call, | |
89 | inside a conditional expression, inside a statement expression, | |
90 | and in other cases as well. */ | |
91 | int inhibit_defer_pop; | |
92 | ||
93 | /* A list of all cleanups which belong to the arguments of | |
94 | function calls being expanded by expand_call. */ | |
95 | tree cleanups_this_call; | |
96 | ||
97 | /* Nonzero means __builtin_saveregs has already been done in this function. | |
98 | The value is the pseudoreg containing the value __builtin_saveregs | |
99 | returned. */ | |
100 | static rtx saveregs_value; | |
101 | ||
dcf76fff TW |
102 | /* Similarly for __builtin_apply_args. */ |
103 | static rtx apply_args_value; | |
104 | ||
4969d05d RK |
105 | /* This structure is used by move_by_pieces to describe the move to |
106 | be performed. */ | |
107 | ||
108 | struct move_by_pieces | |
109 | { | |
110 | rtx to; | |
111 | rtx to_addr; | |
112 | int autinc_to; | |
113 | int explicit_inc_to; | |
114 | rtx from; | |
115 | rtx from_addr; | |
116 | int autinc_from; | |
117 | int explicit_inc_from; | |
118 | int len; | |
119 | int offset; | |
120 | int reverse; | |
121 | }; | |
122 | ||
c02bd5d9 JB |
123 | /* Used to generate bytecodes: keep track of size of local variables, |
124 | as well as depth of arithmetic stack. (Notice that variables are | |
125 | stored on the machine's stack, not the arithmetic stack.) */ | |
126 | ||
186f92ce | 127 | extern int local_vars_size; |
c02bd5d9 JB |
128 | extern int stack_depth; |
129 | extern int max_stack_depth; | |
292b1216 | 130 | extern struct obstack permanent_obstack; |
c02bd5d9 JB |
131 | |
132 | ||
4969d05d RK |
133 | static rtx enqueue_insn PROTO((rtx, rtx)); |
134 | static int queued_subexp_p PROTO((rtx)); | |
135 | static void init_queue PROTO((void)); | |
136 | static void move_by_pieces PROTO((rtx, rtx, int, int)); | |
137 | static int move_by_pieces_ninsns PROTO((unsigned int, int)); | |
138 | static void move_by_pieces_1 PROTO((rtx (*) (), enum machine_mode, | |
139 | struct move_by_pieces *)); | |
4969d05d RK |
140 | static void store_constructor PROTO((tree, rtx)); |
141 | static rtx store_field PROTO((rtx, int, int, enum machine_mode, tree, | |
142 | enum machine_mode, int, int, int)); | |
143 | static tree save_noncopied_parts PROTO((tree, tree)); | |
144 | static tree init_noncopied_parts PROTO((tree, tree)); | |
145 | static int safe_from_p PROTO((rtx, tree)); | |
146 | static int fixed_type_p PROTO((tree)); | |
147 | static int get_pointer_alignment PROTO((tree, unsigned)); | |
148 | static tree string_constant PROTO((tree, tree *)); | |
149 | static tree c_strlen PROTO((tree)); | |
307b821c RK |
150 | static rtx expand_builtin PROTO((tree, rtx, rtx, |
151 | enum machine_mode, int)); | |
0006469d TW |
152 | static int apply_args_size PROTO((void)); |
153 | static int apply_result_size PROTO((void)); | |
154 | static rtx result_vector PROTO((int, rtx)); | |
155 | static rtx expand_builtin_apply_args PROTO((void)); | |
156 | static rtx expand_builtin_apply PROTO((rtx, rtx, rtx)); | |
157 | static void expand_builtin_return PROTO((rtx)); | |
4969d05d | 158 | static rtx expand_increment PROTO((tree, int)); |
ca695ac9 JB |
159 | rtx bc_expand_increment PROTO((struct increment_operator *, tree)); |
160 | tree bc_runtime_type_code PROTO((tree)); | |
161 | rtx bc_allocate_local PROTO((int, int)); | |
162 | void bc_store_memory PROTO((tree, tree)); | |
163 | tree bc_expand_component_address PROTO((tree)); | |
164 | tree bc_expand_address PROTO((tree)); | |
165 | void bc_expand_constructor PROTO((tree)); | |
166 | void bc_adjust_stack PROTO((int)); | |
167 | tree bc_canonicalize_array_ref PROTO((tree)); | |
168 | void bc_load_memory PROTO((tree, tree)); | |
169 | void bc_load_externaddr PROTO((rtx)); | |
170 | void bc_load_externaddr_id PROTO((tree, int)); | |
171 | void bc_load_localaddr PROTO((rtx)); | |
172 | void bc_load_parmaddr PROTO((rtx)); | |
4969d05d RK |
173 | static void preexpand_calls PROTO((tree)); |
174 | static void do_jump_by_parts_greater PROTO((tree, int, rtx, rtx)); | |
f81497d9 | 175 | static void do_jump_by_parts_greater_rtx PROTO((enum machine_mode, int, rtx, rtx, rtx, rtx)); |
4969d05d RK |
176 | static void do_jump_by_parts_equality PROTO((tree, rtx, rtx)); |
177 | static void do_jump_by_parts_equality_rtx PROTO((rtx, rtx, rtx)); | |
178 | static void do_jump_for_compare PROTO((rtx, rtx, rtx)); | |
179 | static rtx compare PROTO((tree, enum rtx_code, enum rtx_code)); | |
180 | static rtx do_store_flag PROTO((tree, rtx, enum machine_mode, int)); | |
bbf6f052 | 181 | |
4fa52007 RK |
182 | /* Record for each mode whether we can move a register directly to or |
183 | from an object of that mode in memory. If we can't, we won't try | |
184 | to use that mode directly when accessing a field of that mode. */ | |
185 | ||
186 | static char direct_load[NUM_MACHINE_MODES]; | |
187 | static char direct_store[NUM_MACHINE_MODES]; | |
188 | ||
bbf6f052 RK |
189 | /* MOVE_RATIO is the number of move instructions that is better than |
190 | a block move. */ | |
191 | ||
192 | #ifndef MOVE_RATIO | |
266007a7 | 193 | #if defined (HAVE_movstrqi) || defined (HAVE_movstrhi) || defined (HAVE_movstrsi) || defined (HAVE_movstrdi) || defined (HAVE_movstrti) |
bbf6f052 RK |
194 | #define MOVE_RATIO 2 |
195 | #else | |
196 | /* A value of around 6 would minimize code size; infinity would minimize | |
197 | execution time. */ | |
198 | #define MOVE_RATIO 15 | |
199 | #endif | |
200 | #endif | |
e87b4f3f | 201 | |
266007a7 | 202 | /* This array records the insn_code of insns to perform block moves. */ |
e6677db3 | 203 | enum insn_code movstr_optab[NUM_MACHINE_MODES]; |
266007a7 | 204 | |
e87b4f3f RS |
205 | /* SLOW_UNALIGNED_ACCESS is non-zero if unaligned accesses are very slow. */ |
206 | ||
207 | #ifndef SLOW_UNALIGNED_ACCESS | |
208 | #define SLOW_UNALIGNED_ACCESS 0 | |
209 | #endif | |
0006469d TW |
210 | |
211 | /* Register mappings for target machines without register windows. */ | |
212 | #ifndef INCOMING_REGNO | |
213 | #define INCOMING_REGNO(OUT) (OUT) | |
214 | #endif | |
215 | #ifndef OUTGOING_REGNO | |
216 | #define OUTGOING_REGNO(IN) (IN) | |
217 | #endif | |
bbf6f052 | 218 | \f |
ca695ac9 JB |
219 | /* Maps used to convert modes to const, load, and store bytecodes. */ |
220 | enum bytecode_opcode mode_to_const_map[MAX_MACHINE_MODE]; | |
221 | enum bytecode_opcode mode_to_load_map[MAX_MACHINE_MODE]; | |
222 | enum bytecode_opcode mode_to_store_map[MAX_MACHINE_MODE]; | |
223 | ||
224 | /* Initialize maps used to convert modes to const, load, and store | |
225 | bytecodes. */ | |
226 | void | |
227 | bc_init_mode_to_opcode_maps () | |
228 | { | |
229 | int mode; | |
230 | ||
6bd6178d | 231 | for (mode = 0; mode < (int) MAX_MACHINE_MODE; mode++) |
ca695ac9 JB |
232 | mode_to_const_map[mode] = |
233 | mode_to_load_map[mode] = | |
234 | mode_to_store_map[mode] = neverneverland; | |
235 | ||
236 | #define DEF_MODEMAP(SYM, CODE, UCODE, CONST, LOAD, STORE) \ | |
6bd6178d RK |
237 | mode_to_const_map[(int) SYM] = CONST; \ |
238 | mode_to_load_map[(int) SYM] = LOAD; \ | |
239 | mode_to_store_map[(int) SYM] = STORE; | |
ca695ac9 JB |
240 | |
241 | #include "modemap.def" | |
242 | #undef DEF_MODEMAP | |
243 | } | |
244 | \f | |
4fa52007 | 245 | /* This is run once per compilation to set up which modes can be used |
266007a7 | 246 | directly in memory and to initialize the block move optab. */ |
4fa52007 RK |
247 | |
248 | void | |
249 | init_expr_once () | |
250 | { | |
251 | rtx insn, pat; | |
252 | enum machine_mode mode; | |
e2549997 RS |
253 | /* Try indexing by frame ptr and try by stack ptr. |
254 | It is known that on the Convex the stack ptr isn't a valid index. | |
255 | With luck, one or the other is valid on any machine. */ | |
4fa52007 | 256 | rtx mem = gen_rtx (MEM, VOIDmode, stack_pointer_rtx); |
e2549997 | 257 | rtx mem1 = gen_rtx (MEM, VOIDmode, frame_pointer_rtx); |
4fa52007 RK |
258 | |
259 | start_sequence (); | |
260 | insn = emit_insn (gen_rtx (SET, 0, 0)); | |
261 | pat = PATTERN (insn); | |
262 | ||
263 | for (mode = VOIDmode; (int) mode < NUM_MACHINE_MODES; | |
264 | mode = (enum machine_mode) ((int) mode + 1)) | |
265 | { | |
266 | int regno; | |
267 | rtx reg; | |
268 | int num_clobbers; | |
269 | ||
270 | direct_load[(int) mode] = direct_store[(int) mode] = 0; | |
271 | PUT_MODE (mem, mode); | |
e2549997 | 272 | PUT_MODE (mem1, mode); |
4fa52007 | 273 | |
e6fe56a4 RK |
274 | /* See if there is some register that can be used in this mode and |
275 | directly loaded or stored from memory. */ | |
276 | ||
7308a047 RS |
277 | if (mode != VOIDmode && mode != BLKmode) |
278 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER | |
279 | && (direct_load[(int) mode] == 0 || direct_store[(int) mode] == 0); | |
280 | regno++) | |
281 | { | |
282 | if (! HARD_REGNO_MODE_OK (regno, mode)) | |
283 | continue; | |
e6fe56a4 | 284 | |
7308a047 | 285 | reg = gen_rtx (REG, mode, regno); |
e6fe56a4 | 286 | |
7308a047 RS |
287 | SET_SRC (pat) = mem; |
288 | SET_DEST (pat) = reg; | |
289 | if (recog (pat, insn, &num_clobbers) >= 0) | |
290 | direct_load[(int) mode] = 1; | |
e6fe56a4 | 291 | |
e2549997 RS |
292 | SET_SRC (pat) = mem1; |
293 | SET_DEST (pat) = reg; | |
294 | if (recog (pat, insn, &num_clobbers) >= 0) | |
295 | direct_load[(int) mode] = 1; | |
296 | ||
7308a047 RS |
297 | SET_SRC (pat) = reg; |
298 | SET_DEST (pat) = mem; | |
299 | if (recog (pat, insn, &num_clobbers) >= 0) | |
300 | direct_store[(int) mode] = 1; | |
e2549997 RS |
301 | |
302 | SET_SRC (pat) = reg; | |
303 | SET_DEST (pat) = mem1; | |
304 | if (recog (pat, insn, &num_clobbers) >= 0) | |
305 | direct_store[(int) mode] = 1; | |
7308a047 | 306 | } |
4fa52007 RK |
307 | } |
308 | ||
309 | end_sequence (); | |
310 | } | |
311 | ||
bbf6f052 RK |
312 | /* This is run at the start of compiling a function. */ |
313 | ||
314 | void | |
315 | init_expr () | |
316 | { | |
317 | init_queue (); | |
318 | ||
319 | pending_stack_adjust = 0; | |
320 | inhibit_defer_pop = 0; | |
321 | cleanups_this_call = 0; | |
322 | saveregs_value = 0; | |
0006469d | 323 | apply_args_value = 0; |
e87b4f3f | 324 | forced_labels = 0; |
bbf6f052 RK |
325 | } |
326 | ||
327 | /* Save all variables describing the current status into the structure *P. | |
328 | This is used before starting a nested function. */ | |
329 | ||
330 | void | |
331 | save_expr_status (p) | |
332 | struct function *p; | |
333 | { | |
334 | /* Instead of saving the postincrement queue, empty it. */ | |
335 | emit_queue (); | |
336 | ||
337 | p->pending_stack_adjust = pending_stack_adjust; | |
338 | p->inhibit_defer_pop = inhibit_defer_pop; | |
339 | p->cleanups_this_call = cleanups_this_call; | |
340 | p->saveregs_value = saveregs_value; | |
0006469d | 341 | p->apply_args_value = apply_args_value; |
e87b4f3f | 342 | p->forced_labels = forced_labels; |
bbf6f052 RK |
343 | |
344 | pending_stack_adjust = 0; | |
345 | inhibit_defer_pop = 0; | |
346 | cleanups_this_call = 0; | |
347 | saveregs_value = 0; | |
0006469d | 348 | apply_args_value = 0; |
e87b4f3f | 349 | forced_labels = 0; |
bbf6f052 RK |
350 | } |
351 | ||
352 | /* Restore all variables describing the current status from the structure *P. | |
353 | This is used after a nested function. */ | |
354 | ||
355 | void | |
356 | restore_expr_status (p) | |
357 | struct function *p; | |
358 | { | |
359 | pending_stack_adjust = p->pending_stack_adjust; | |
360 | inhibit_defer_pop = p->inhibit_defer_pop; | |
361 | cleanups_this_call = p->cleanups_this_call; | |
362 | saveregs_value = p->saveregs_value; | |
0006469d | 363 | apply_args_value = p->apply_args_value; |
e87b4f3f | 364 | forced_labels = p->forced_labels; |
bbf6f052 RK |
365 | } |
366 | \f | |
367 | /* Manage the queue of increment instructions to be output | |
368 | for POSTINCREMENT_EXPR expressions, etc. */ | |
369 | ||
370 | static rtx pending_chain; | |
371 | ||
372 | /* Queue up to increment (or change) VAR later. BODY says how: | |
373 | BODY should be the same thing you would pass to emit_insn | |
374 | to increment right away. It will go to emit_insn later on. | |
375 | ||
376 | The value is a QUEUED expression to be used in place of VAR | |
377 | where you want to guarantee the pre-incrementation value of VAR. */ | |
378 | ||
379 | static rtx | |
380 | enqueue_insn (var, body) | |
381 | rtx var, body; | |
382 | { | |
383 | pending_chain = gen_rtx (QUEUED, GET_MODE (var), | |
906c4e36 | 384 | var, NULL_RTX, NULL_RTX, body, pending_chain); |
bbf6f052 RK |
385 | return pending_chain; |
386 | } | |
387 | ||
388 | /* Use protect_from_queue to convert a QUEUED expression | |
389 | into something that you can put immediately into an instruction. | |
390 | If the queued incrementation has not happened yet, | |
391 | protect_from_queue returns the variable itself. | |
392 | If the incrementation has happened, protect_from_queue returns a temp | |
393 | that contains a copy of the old value of the variable. | |
394 | ||
395 | Any time an rtx which might possibly be a QUEUED is to be put | |
396 | into an instruction, it must be passed through protect_from_queue first. | |
397 | QUEUED expressions are not meaningful in instructions. | |
398 | ||
399 | Do not pass a value through protect_from_queue and then hold | |
400 | on to it for a while before putting it in an instruction! | |
401 | If the queue is flushed in between, incorrect code will result. */ | |
402 | ||
403 | rtx | |
404 | protect_from_queue (x, modify) | |
405 | register rtx x; | |
406 | int modify; | |
407 | { | |
408 | register RTX_CODE code = GET_CODE (x); | |
409 | ||
410 | #if 0 /* A QUEUED can hang around after the queue is forced out. */ | |
411 | /* Shortcut for most common case. */ | |
412 | if (pending_chain == 0) | |
413 | return x; | |
414 | #endif | |
415 | ||
416 | if (code != QUEUED) | |
417 | { | |
e9baa644 RK |
418 | /* A special hack for read access to (MEM (QUEUED ...)) to facilitate |
419 | use of autoincrement. Make a copy of the contents of the memory | |
420 | location rather than a copy of the address, but not if the value is | |
421 | of mode BLKmode. Don't modify X in place since it might be | |
422 | shared. */ | |
bbf6f052 RK |
423 | if (code == MEM && GET_MODE (x) != BLKmode |
424 | && GET_CODE (XEXP (x, 0)) == QUEUED && !modify) | |
425 | { | |
426 | register rtx y = XEXP (x, 0); | |
e9baa644 RK |
427 | register rtx new = gen_rtx (MEM, GET_MODE (x), QUEUED_VAR (y)); |
428 | ||
429 | MEM_IN_STRUCT_P (new) = MEM_IN_STRUCT_P (x); | |
430 | RTX_UNCHANGING_P (new) = RTX_UNCHANGING_P (x); | |
431 | MEM_VOLATILE_P (new) = MEM_VOLATILE_P (x); | |
432 | ||
bbf6f052 RK |
433 | if (QUEUED_INSN (y)) |
434 | { | |
e9baa644 RK |
435 | register rtx temp = gen_reg_rtx (GET_MODE (new)); |
436 | emit_insn_before (gen_move_insn (temp, new), | |
bbf6f052 RK |
437 | QUEUED_INSN (y)); |
438 | return temp; | |
439 | } | |
e9baa644 | 440 | return new; |
bbf6f052 RK |
441 | } |
442 | /* Otherwise, recursively protect the subexpressions of all | |
443 | the kinds of rtx's that can contain a QUEUED. */ | |
444 | if (code == MEM) | |
3f15938e RS |
445 | { |
446 | rtx tem = protect_from_queue (XEXP (x, 0), 0); | |
447 | if (tem != XEXP (x, 0)) | |
448 | { | |
449 | x = copy_rtx (x); | |
450 | XEXP (x, 0) = tem; | |
451 | } | |
452 | } | |
bbf6f052 RK |
453 | else if (code == PLUS || code == MULT) |
454 | { | |
3f15938e RS |
455 | rtx new0 = protect_from_queue (XEXP (x, 0), 0); |
456 | rtx new1 = protect_from_queue (XEXP (x, 1), 0); | |
457 | if (new0 != XEXP (x, 0) || new1 != XEXP (x, 1)) | |
458 | { | |
459 | x = copy_rtx (x); | |
460 | XEXP (x, 0) = new0; | |
461 | XEXP (x, 1) = new1; | |
462 | } | |
bbf6f052 RK |
463 | } |
464 | return x; | |
465 | } | |
466 | /* If the increment has not happened, use the variable itself. */ | |
467 | if (QUEUED_INSN (x) == 0) | |
468 | return QUEUED_VAR (x); | |
469 | /* If the increment has happened and a pre-increment copy exists, | |
470 | use that copy. */ | |
471 | if (QUEUED_COPY (x) != 0) | |
472 | return QUEUED_COPY (x); | |
473 | /* The increment has happened but we haven't set up a pre-increment copy. | |
474 | Set one up now, and use it. */ | |
475 | QUEUED_COPY (x) = gen_reg_rtx (GET_MODE (QUEUED_VAR (x))); | |
476 | emit_insn_before (gen_move_insn (QUEUED_COPY (x), QUEUED_VAR (x)), | |
477 | QUEUED_INSN (x)); | |
478 | return QUEUED_COPY (x); | |
479 | } | |
480 | ||
481 | /* Return nonzero if X contains a QUEUED expression: | |
482 | if it contains anything that will be altered by a queued increment. | |
483 | We handle only combinations of MEM, PLUS, MINUS and MULT operators | |
484 | since memory addresses generally contain only those. */ | |
485 | ||
486 | static int | |
487 | queued_subexp_p (x) | |
488 | rtx x; | |
489 | { | |
490 | register enum rtx_code code = GET_CODE (x); | |
491 | switch (code) | |
492 | { | |
493 | case QUEUED: | |
494 | return 1; | |
495 | case MEM: | |
496 | return queued_subexp_p (XEXP (x, 0)); | |
497 | case MULT: | |
498 | case PLUS: | |
499 | case MINUS: | |
500 | return queued_subexp_p (XEXP (x, 0)) | |
501 | || queued_subexp_p (XEXP (x, 1)); | |
502 | } | |
503 | return 0; | |
504 | } | |
505 | ||
506 | /* Perform all the pending incrementations. */ | |
507 | ||
508 | void | |
509 | emit_queue () | |
510 | { | |
511 | register rtx p; | |
512 | while (p = pending_chain) | |
513 | { | |
514 | QUEUED_INSN (p) = emit_insn (QUEUED_BODY (p)); | |
515 | pending_chain = QUEUED_NEXT (p); | |
516 | } | |
517 | } | |
518 | ||
519 | static void | |
520 | init_queue () | |
521 | { | |
522 | if (pending_chain) | |
523 | abort (); | |
524 | } | |
525 | \f | |
526 | /* Copy data from FROM to TO, where the machine modes are not the same. | |
527 | Both modes may be integer, or both may be floating. | |
528 | UNSIGNEDP should be nonzero if FROM is an unsigned type. | |
529 | This causes zero-extension instead of sign-extension. */ | |
530 | ||
531 | void | |
532 | convert_move (to, from, unsignedp) | |
533 | register rtx to, from; | |
534 | int unsignedp; | |
535 | { | |
536 | enum machine_mode to_mode = GET_MODE (to); | |
537 | enum machine_mode from_mode = GET_MODE (from); | |
538 | int to_real = GET_MODE_CLASS (to_mode) == MODE_FLOAT; | |
539 | int from_real = GET_MODE_CLASS (from_mode) == MODE_FLOAT; | |
540 | enum insn_code code; | |
541 | rtx libcall; | |
542 | ||
543 | /* rtx code for making an equivalent value. */ | |
544 | enum rtx_code equiv_code = (unsignedp ? ZERO_EXTEND : SIGN_EXTEND); | |
545 | ||
546 | to = protect_from_queue (to, 1); | |
547 | from = protect_from_queue (from, 0); | |
548 | ||
549 | if (to_real != from_real) | |
550 | abort (); | |
551 | ||
1499e0a8 RK |
552 | /* If FROM is a SUBREG that indicates that we have already done at least |
553 | the required extension, strip it. We don't handle such SUBREGs as | |
554 | TO here. */ | |
555 | ||
556 | if (GET_CODE (from) == SUBREG && SUBREG_PROMOTED_VAR_P (from) | |
557 | && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (from))) | |
558 | >= GET_MODE_SIZE (to_mode)) | |
559 | && SUBREG_PROMOTED_UNSIGNED_P (from) == unsignedp) | |
560 | from = gen_lowpart (to_mode, from), from_mode = to_mode; | |
561 | ||
562 | if (GET_CODE (to) == SUBREG && SUBREG_PROMOTED_VAR_P (to)) | |
563 | abort (); | |
564 | ||
bbf6f052 RK |
565 | if (to_mode == from_mode |
566 | || (from_mode == VOIDmode && CONSTANT_P (from))) | |
567 | { | |
568 | emit_move_insn (to, from); | |
569 | return; | |
570 | } | |
571 | ||
572 | if (to_real) | |
573 | { | |
81d79e2c RS |
574 | rtx value; |
575 | ||
b424402e RS |
576 | #ifdef HAVE_extendqfhf2 |
577 | if (HAVE_extendqfsf2 && from_mode == QFmode && to_mode == HFmode) | |
578 | { | |
579 | emit_unop_insn (CODE_FOR_extendqfsf2, to, from, UNKNOWN); | |
580 | return; | |
581 | } | |
582 | #endif | |
583 | #ifdef HAVE_extendqfsf2 | |
584 | if (HAVE_extendqfsf2 && from_mode == QFmode && to_mode == SFmode) | |
585 | { | |
586 | emit_unop_insn (CODE_FOR_extendqfsf2, to, from, UNKNOWN); | |
587 | return; | |
588 | } | |
589 | #endif | |
590 | #ifdef HAVE_extendqfdf2 | |
591 | if (HAVE_extendqfdf2 && from_mode == QFmode && to_mode == DFmode) | |
592 | { | |
593 | emit_unop_insn (CODE_FOR_extendqfdf2, to, from, UNKNOWN); | |
594 | return; | |
595 | } | |
596 | #endif | |
597 | #ifdef HAVE_extendqfxf2 | |
598 | if (HAVE_extendqfxf2 && from_mode == QFmode && to_mode == XFmode) | |
599 | { | |
600 | emit_unop_insn (CODE_FOR_extendqfxf2, to, from, UNKNOWN); | |
601 | return; | |
602 | } | |
603 | #endif | |
604 | #ifdef HAVE_extendqftf2 | |
605 | if (HAVE_extendqftf2 && from_mode == QFmode && to_mode == TFmode) | |
606 | { | |
607 | emit_unop_insn (CODE_FOR_extendqftf2, to, from, UNKNOWN); | |
608 | return; | |
609 | } | |
610 | #endif | |
611 | ||
612 | #ifdef HAVE_extendhfsf2 | |
613 | if (HAVE_extendhfsf2 && from_mode == HFmode && to_mode == SFmode) | |
614 | { | |
615 | emit_unop_insn (CODE_FOR_extendhfsf2, to, from, UNKNOWN); | |
616 | return; | |
617 | } | |
618 | #endif | |
619 | #ifdef HAVE_extendhfdf2 | |
620 | if (HAVE_extendhfdf2 && from_mode == HFmode && to_mode == DFmode) | |
621 | { | |
622 | emit_unop_insn (CODE_FOR_extendhfdf2, to, from, UNKNOWN); | |
623 | return; | |
624 | } | |
625 | #endif | |
626 | #ifdef HAVE_extendhfxf2 | |
627 | if (HAVE_extendhfxf2 && from_mode == HFmode && to_mode == XFmode) | |
628 | { | |
629 | emit_unop_insn (CODE_FOR_extendhfxf2, to, from, UNKNOWN); | |
630 | return; | |
631 | } | |
632 | #endif | |
633 | #ifdef HAVE_extendhftf2 | |
634 | if (HAVE_extendhftf2 && from_mode == HFmode && to_mode == TFmode) | |
635 | { | |
636 | emit_unop_insn (CODE_FOR_extendhftf2, to, from, UNKNOWN); | |
637 | return; | |
638 | } | |
639 | #endif | |
640 | ||
bbf6f052 RK |
641 | #ifdef HAVE_extendsfdf2 |
642 | if (HAVE_extendsfdf2 && from_mode == SFmode && to_mode == DFmode) | |
643 | { | |
644 | emit_unop_insn (CODE_FOR_extendsfdf2, to, from, UNKNOWN); | |
645 | return; | |
646 | } | |
647 | #endif | |
b092b471 JW |
648 | #ifdef HAVE_extendsfxf2 |
649 | if (HAVE_extendsfxf2 && from_mode == SFmode && to_mode == XFmode) | |
650 | { | |
651 | emit_unop_insn (CODE_FOR_extendsfxf2, to, from, UNKNOWN); | |
652 | return; | |
653 | } | |
654 | #endif | |
bbf6f052 RK |
655 | #ifdef HAVE_extendsftf2 |
656 | if (HAVE_extendsftf2 && from_mode == SFmode && to_mode == TFmode) | |
657 | { | |
658 | emit_unop_insn (CODE_FOR_extendsftf2, to, from, UNKNOWN); | |
659 | return; | |
660 | } | |
661 | #endif | |
b092b471 JW |
662 | #ifdef HAVE_extenddfxf2 |
663 | if (HAVE_extenddfxf2 && from_mode == DFmode && to_mode == XFmode) | |
664 | { | |
665 | emit_unop_insn (CODE_FOR_extenddfxf2, to, from, UNKNOWN); | |
666 | return; | |
667 | } | |
668 | #endif | |
bbf6f052 RK |
669 | #ifdef HAVE_extenddftf2 |
670 | if (HAVE_extenddftf2 && from_mode == DFmode && to_mode == TFmode) | |
671 | { | |
672 | emit_unop_insn (CODE_FOR_extenddftf2, to, from, UNKNOWN); | |
673 | return; | |
674 | } | |
675 | #endif | |
b424402e RS |
676 | |
677 | #ifdef HAVE_trunchfqf2 | |
678 | if (HAVE_trunchfqf2 && from_mode == HFmode && to_mode == QFmode) | |
679 | { | |
680 | emit_unop_insn (CODE_FOR_trunchfqf2, to, from, UNKNOWN); | |
681 | return; | |
682 | } | |
683 | #endif | |
684 | #ifdef HAVE_truncsfqf2 | |
685 | if (HAVE_truncsfqf2 && from_mode == SFmode && to_mode == QFmode) | |
686 | { | |
687 | emit_unop_insn (CODE_FOR_truncsfqf2, to, from, UNKNOWN); | |
688 | return; | |
689 | } | |
690 | #endif | |
691 | #ifdef HAVE_truncdfqf2 | |
692 | if (HAVE_truncdfqf2 && from_mode == DFmode && to_mode == QFmode) | |
693 | { | |
694 | emit_unop_insn (CODE_FOR_truncdfqf2, to, from, UNKNOWN); | |
695 | return; | |
696 | } | |
697 | #endif | |
698 | #ifdef HAVE_truncxfqf2 | |
699 | if (HAVE_truncxfqf2 && from_mode == XFmode && to_mode == QFmode) | |
700 | { | |
701 | emit_unop_insn (CODE_FOR_truncxfqf2, to, from, UNKNOWN); | |
702 | return; | |
703 | } | |
704 | #endif | |
705 | #ifdef HAVE_trunctfqf2 | |
706 | if (HAVE_trunctfqf2 && from_mode == TFmode && to_mode == QFmode) | |
707 | { | |
708 | emit_unop_insn (CODE_FOR_trunctfqf2, to, from, UNKNOWN); | |
709 | return; | |
710 | } | |
711 | #endif | |
712 | #ifdef HAVE_truncsfhf2 | |
713 | if (HAVE_truncsfhf2 && from_mode == SFmode && to_mode == HFmode) | |
714 | { | |
715 | emit_unop_insn (CODE_FOR_truncsfhf2, to, from, UNKNOWN); | |
716 | return; | |
717 | } | |
718 | #endif | |
719 | #ifdef HAVE_truncdfhf2 | |
720 | if (HAVE_truncdfhf2 && from_mode == DFmode && to_mode == HFmode) | |
721 | { | |
722 | emit_unop_insn (CODE_FOR_truncdfhf2, to, from, UNKNOWN); | |
723 | return; | |
724 | } | |
725 | #endif | |
726 | #ifdef HAVE_truncxfhf2 | |
727 | if (HAVE_truncxfhf2 && from_mode == XFmode && to_mode == HFmode) | |
728 | { | |
729 | emit_unop_insn (CODE_FOR_truncxfhf2, to, from, UNKNOWN); | |
730 | return; | |
731 | } | |
732 | #endif | |
733 | #ifdef HAVE_trunctfhf2 | |
734 | if (HAVE_trunctfhf2 && from_mode == TFmode && to_mode == HFmode) | |
735 | { | |
736 | emit_unop_insn (CODE_FOR_trunctfhf2, to, from, UNKNOWN); | |
737 | return; | |
738 | } | |
739 | #endif | |
bbf6f052 RK |
740 | #ifdef HAVE_truncdfsf2 |
741 | if (HAVE_truncdfsf2 && from_mode == DFmode && to_mode == SFmode) | |
742 | { | |
743 | emit_unop_insn (CODE_FOR_truncdfsf2, to, from, UNKNOWN); | |
744 | return; | |
745 | } | |
746 | #endif | |
b092b471 JW |
747 | #ifdef HAVE_truncxfsf2 |
748 | if (HAVE_truncxfsf2 && from_mode == XFmode && to_mode == SFmode) | |
749 | { | |
750 | emit_unop_insn (CODE_FOR_truncxfsf2, to, from, UNKNOWN); | |
751 | return; | |
752 | } | |
753 | #endif | |
bbf6f052 RK |
754 | #ifdef HAVE_trunctfsf2 |
755 | if (HAVE_trunctfsf2 && from_mode == TFmode && to_mode == SFmode) | |
756 | { | |
757 | emit_unop_insn (CODE_FOR_trunctfsf2, to, from, UNKNOWN); | |
758 | return; | |
759 | } | |
760 | #endif | |
b092b471 JW |
761 | #ifdef HAVE_truncxfdf2 |
762 | if (HAVE_truncxfdf2 && from_mode == XFmode && to_mode == DFmode) | |
763 | { | |
764 | emit_unop_insn (CODE_FOR_truncxfdf2, to, from, UNKNOWN); | |
765 | return; | |
766 | } | |
767 | #endif | |
bbf6f052 RK |
768 | #ifdef HAVE_trunctfdf2 |
769 | if (HAVE_trunctfdf2 && from_mode == TFmode && to_mode == DFmode) | |
770 | { | |
771 | emit_unop_insn (CODE_FOR_trunctfdf2, to, from, UNKNOWN); | |
772 | return; | |
773 | } | |
774 | #endif | |
775 | ||
b092b471 JW |
776 | libcall = (rtx) 0; |
777 | switch (from_mode) | |
778 | { | |
779 | case SFmode: | |
780 | switch (to_mode) | |
781 | { | |
782 | case DFmode: | |
783 | libcall = extendsfdf2_libfunc; | |
784 | break; | |
785 | ||
786 | case XFmode: | |
787 | libcall = extendsfxf2_libfunc; | |
788 | break; | |
789 | ||
790 | case TFmode: | |
791 | libcall = extendsftf2_libfunc; | |
792 | break; | |
793 | } | |
794 | break; | |
795 | ||
796 | case DFmode: | |
797 | switch (to_mode) | |
798 | { | |
799 | case SFmode: | |
800 | libcall = truncdfsf2_libfunc; | |
801 | break; | |
802 | ||
803 | case XFmode: | |
804 | libcall = extenddfxf2_libfunc; | |
805 | break; | |
806 | ||
807 | case TFmode: | |
808 | libcall = extenddftf2_libfunc; | |
809 | break; | |
810 | } | |
811 | break; | |
812 | ||
813 | case XFmode: | |
814 | switch (to_mode) | |
815 | { | |
816 | case SFmode: | |
817 | libcall = truncxfsf2_libfunc; | |
818 | break; | |
819 | ||
820 | case DFmode: | |
821 | libcall = truncxfdf2_libfunc; | |
822 | break; | |
823 | } | |
824 | break; | |
825 | ||
826 | case TFmode: | |
827 | switch (to_mode) | |
828 | { | |
829 | case SFmode: | |
830 | libcall = trunctfsf2_libfunc; | |
831 | break; | |
832 | ||
833 | case DFmode: | |
834 | libcall = trunctfdf2_libfunc; | |
835 | break; | |
836 | } | |
837 | break; | |
838 | } | |
839 | ||
840 | if (libcall == (rtx) 0) | |
841 | /* This conversion is not implemented yet. */ | |
bbf6f052 RK |
842 | abort (); |
843 | ||
81d79e2c RS |
844 | value = emit_library_call_value (libcall, NULL_RTX, 1, to_mode, |
845 | 1, from, from_mode); | |
846 | emit_move_insn (to, value); | |
bbf6f052 RK |
847 | return; |
848 | } | |
849 | ||
850 | /* Now both modes are integers. */ | |
851 | ||
852 | /* Handle expanding beyond a word. */ | |
853 | if (GET_MODE_BITSIZE (from_mode) < GET_MODE_BITSIZE (to_mode) | |
854 | && GET_MODE_BITSIZE (to_mode) > BITS_PER_WORD) | |
855 | { | |
856 | rtx insns; | |
857 | rtx lowpart; | |
858 | rtx fill_value; | |
859 | rtx lowfrom; | |
860 | int i; | |
861 | enum machine_mode lowpart_mode; | |
862 | int nwords = CEIL (GET_MODE_SIZE (to_mode), UNITS_PER_WORD); | |
863 | ||
864 | /* Try converting directly if the insn is supported. */ | |
865 | if ((code = can_extend_p (to_mode, from_mode, unsignedp)) | |
866 | != CODE_FOR_nothing) | |
867 | { | |
cd1b4b44 RK |
868 | /* If FROM is a SUBREG, put it into a register. Do this |
869 | so that we always generate the same set of insns for | |
870 | better cse'ing; if an intermediate assignment occurred, | |
871 | we won't be doing the operation directly on the SUBREG. */ | |
872 | if (optimize > 0 && GET_CODE (from) == SUBREG) | |
873 | from = force_reg (from_mode, from); | |
bbf6f052 RK |
874 | emit_unop_insn (code, to, from, equiv_code); |
875 | return; | |
876 | } | |
877 | /* Next, try converting via full word. */ | |
878 | else if (GET_MODE_BITSIZE (from_mode) < BITS_PER_WORD | |
879 | && ((code = can_extend_p (to_mode, word_mode, unsignedp)) | |
880 | != CODE_FOR_nothing)) | |
881 | { | |
a81fee56 RS |
882 | if (GET_CODE (to) == REG) |
883 | emit_insn (gen_rtx (CLOBBER, VOIDmode, to)); | |
bbf6f052 RK |
884 | convert_move (gen_lowpart (word_mode, to), from, unsignedp); |
885 | emit_unop_insn (code, to, | |
886 | gen_lowpart (word_mode, to), equiv_code); | |
887 | return; | |
888 | } | |
889 | ||
890 | /* No special multiword conversion insn; do it by hand. */ | |
891 | start_sequence (); | |
892 | ||
893 | /* Get a copy of FROM widened to a word, if necessary. */ | |
894 | if (GET_MODE_BITSIZE (from_mode) < BITS_PER_WORD) | |
895 | lowpart_mode = word_mode; | |
896 | else | |
897 | lowpart_mode = from_mode; | |
898 | ||
899 | lowfrom = convert_to_mode (lowpart_mode, from, unsignedp); | |
900 | ||
901 | lowpart = gen_lowpart (lowpart_mode, to); | |
902 | emit_move_insn (lowpart, lowfrom); | |
903 | ||
904 | /* Compute the value to put in each remaining word. */ | |
905 | if (unsignedp) | |
906 | fill_value = const0_rtx; | |
907 | else | |
908 | { | |
909 | #ifdef HAVE_slt | |
910 | if (HAVE_slt | |
911 | && insn_operand_mode[(int) CODE_FOR_slt][0] == word_mode | |
912 | && STORE_FLAG_VALUE == -1) | |
913 | { | |
906c4e36 RK |
914 | emit_cmp_insn (lowfrom, const0_rtx, NE, NULL_RTX, |
915 | lowpart_mode, 0, 0); | |
bbf6f052 RK |
916 | fill_value = gen_reg_rtx (word_mode); |
917 | emit_insn (gen_slt (fill_value)); | |
918 | } | |
919 | else | |
920 | #endif | |
921 | { | |
922 | fill_value | |
923 | = expand_shift (RSHIFT_EXPR, lowpart_mode, lowfrom, | |
924 | size_int (GET_MODE_BITSIZE (lowpart_mode) - 1), | |
906c4e36 | 925 | NULL_RTX, 0); |
bbf6f052 RK |
926 | fill_value = convert_to_mode (word_mode, fill_value, 1); |
927 | } | |
928 | } | |
929 | ||
930 | /* Fill the remaining words. */ | |
931 | for (i = GET_MODE_SIZE (lowpart_mode) / UNITS_PER_WORD; i < nwords; i++) | |
932 | { | |
933 | int index = (WORDS_BIG_ENDIAN ? nwords - i - 1 : i); | |
934 | rtx subword = operand_subword (to, index, 1, to_mode); | |
935 | ||
936 | if (subword == 0) | |
937 | abort (); | |
938 | ||
939 | if (fill_value != subword) | |
940 | emit_move_insn (subword, fill_value); | |
941 | } | |
942 | ||
943 | insns = get_insns (); | |
944 | end_sequence (); | |
945 | ||
906c4e36 | 946 | emit_no_conflict_block (insns, to, from, NULL_RTX, |
2abec1b7 | 947 | gen_rtx (equiv_code, to_mode, copy_rtx (from))); |
bbf6f052 RK |
948 | return; |
949 | } | |
950 | ||
d3c64ee3 RS |
951 | /* Truncating multi-word to a word or less. */ |
952 | if (GET_MODE_BITSIZE (from_mode) > BITS_PER_WORD | |
953 | && GET_MODE_BITSIZE (to_mode) <= BITS_PER_WORD) | |
bbf6f052 | 954 | { |
431a6eca JW |
955 | if (!((GET_CODE (from) == MEM |
956 | && ! MEM_VOLATILE_P (from) | |
957 | && direct_load[(int) to_mode] | |
958 | && ! mode_dependent_address_p (XEXP (from, 0))) | |
959 | || GET_CODE (from) == REG | |
960 | || GET_CODE (from) == SUBREG)) | |
961 | from = force_reg (from_mode, from); | |
bbf6f052 RK |
962 | convert_move (to, gen_lowpart (word_mode, from), 0); |
963 | return; | |
964 | } | |
965 | ||
966 | /* Handle pointer conversion */ /* SPEE 900220 */ | |
967 | if (to_mode == PSImode) | |
968 | { | |
969 | if (from_mode != SImode) | |
970 | from = convert_to_mode (SImode, from, unsignedp); | |
971 | ||
1f584163 DE |
972 | #ifdef HAVE_truncsipsi2 |
973 | if (HAVE_truncsipsi2) | |
bbf6f052 | 974 | { |
1f584163 | 975 | emit_unop_insn (CODE_FOR_truncsipsi2, to, from, UNKNOWN); |
bbf6f052 RK |
976 | return; |
977 | } | |
1f584163 | 978 | #endif /* HAVE_truncsipsi2 */ |
bbf6f052 RK |
979 | abort (); |
980 | } | |
981 | ||
982 | if (from_mode == PSImode) | |
983 | { | |
984 | if (to_mode != SImode) | |
985 | { | |
986 | from = convert_to_mode (SImode, from, unsignedp); | |
987 | from_mode = SImode; | |
988 | } | |
989 | else | |
990 | { | |
1f584163 DE |
991 | #ifdef HAVE_extendpsisi2 |
992 | if (HAVE_extendpsisi2) | |
bbf6f052 | 993 | { |
1f584163 | 994 | emit_unop_insn (CODE_FOR_extendpsisi2, to, from, UNKNOWN); |
bbf6f052 RK |
995 | return; |
996 | } | |
1f584163 | 997 | #endif /* HAVE_extendpsisi2 */ |
bbf6f052 RK |
998 | abort (); |
999 | } | |
1000 | } | |
1001 | ||
1002 | /* Now follow all the conversions between integers | |
1003 | no more than a word long. */ | |
1004 | ||
1005 | /* For truncation, usually we can just refer to FROM in a narrower mode. */ | |
1006 | if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode) | |
1007 | && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (to_mode), | |
d3c64ee3 | 1008 | GET_MODE_BITSIZE (from_mode))) |
bbf6f052 | 1009 | { |
d3c64ee3 RS |
1010 | if (!((GET_CODE (from) == MEM |
1011 | && ! MEM_VOLATILE_P (from) | |
1012 | && direct_load[(int) to_mode] | |
1013 | && ! mode_dependent_address_p (XEXP (from, 0))) | |
1014 | || GET_CODE (from) == REG | |
1015 | || GET_CODE (from) == SUBREG)) | |
1016 | from = force_reg (from_mode, from); | |
bbf6f052 RK |
1017 | emit_move_insn (to, gen_lowpart (to_mode, from)); |
1018 | return; | |
1019 | } | |
1020 | ||
d3c64ee3 | 1021 | /* Handle extension. */ |
bbf6f052 RK |
1022 | if (GET_MODE_BITSIZE (to_mode) > GET_MODE_BITSIZE (from_mode)) |
1023 | { | |
1024 | /* Convert directly if that works. */ | |
1025 | if ((code = can_extend_p (to_mode, from_mode, unsignedp)) | |
1026 | != CODE_FOR_nothing) | |
1027 | { | |
3dc4195c RK |
1028 | /* If FROM is a SUBREG, put it into a register. Do this |
1029 | so that we always generate the same set of insns for | |
1030 | better cse'ing; if an intermediate assignment occurred, | |
1031 | we won't be doing the operation directly on the SUBREG. */ | |
1032 | if (optimize > 0 && GET_CODE (from) == SUBREG) | |
1033 | from = force_reg (from_mode, from); | |
bbf6f052 RK |
1034 | emit_unop_insn (code, to, from, equiv_code); |
1035 | return; | |
1036 | } | |
1037 | else | |
1038 | { | |
1039 | enum machine_mode intermediate; | |
1040 | ||
1041 | /* Search for a mode to convert via. */ | |
1042 | for (intermediate = from_mode; intermediate != VOIDmode; | |
1043 | intermediate = GET_MODE_WIDER_MODE (intermediate)) | |
1044 | if ((can_extend_p (to_mode, intermediate, unsignedp) | |
1045 | != CODE_FOR_nothing) | |
1046 | && (can_extend_p (intermediate, from_mode, unsignedp) | |
1047 | != CODE_FOR_nothing)) | |
1048 | { | |
1049 | convert_move (to, convert_to_mode (intermediate, from, | |
1050 | unsignedp), unsignedp); | |
1051 | return; | |
1052 | } | |
1053 | ||
1054 | /* No suitable intermediate mode. */ | |
1055 | abort (); | |
1056 | } | |
1057 | } | |
1058 | ||
1059 | /* Support special truncate insns for certain modes. */ | |
1060 | ||
1061 | if (from_mode == DImode && to_mode == SImode) | |
1062 | { | |
1063 | #ifdef HAVE_truncdisi2 | |
1064 | if (HAVE_truncdisi2) | |
1065 | { | |
1066 | emit_unop_insn (CODE_FOR_truncdisi2, to, from, UNKNOWN); | |
1067 | return; | |
1068 | } | |
1069 | #endif | |
1070 | convert_move (to, force_reg (from_mode, from), unsignedp); | |
1071 | return; | |
1072 | } | |
1073 | ||
1074 | if (from_mode == DImode && to_mode == HImode) | |
1075 | { | |
1076 | #ifdef HAVE_truncdihi2 | |
1077 | if (HAVE_truncdihi2) | |
1078 | { | |
1079 | emit_unop_insn (CODE_FOR_truncdihi2, to, from, UNKNOWN); | |
1080 | return; | |
1081 | } | |
1082 | #endif | |
1083 | convert_move (to, force_reg (from_mode, from), unsignedp); | |
1084 | return; | |
1085 | } | |
1086 | ||
1087 | if (from_mode == DImode && to_mode == QImode) | |
1088 | { | |
1089 | #ifdef HAVE_truncdiqi2 | |
1090 | if (HAVE_truncdiqi2) | |
1091 | { | |
1092 | emit_unop_insn (CODE_FOR_truncdiqi2, to, from, UNKNOWN); | |
1093 | return; | |
1094 | } | |
1095 | #endif | |
1096 | convert_move (to, force_reg (from_mode, from), unsignedp); | |
1097 | return; | |
1098 | } | |
1099 | ||
1100 | if (from_mode == SImode && to_mode == HImode) | |
1101 | { | |
1102 | #ifdef HAVE_truncsihi2 | |
1103 | if (HAVE_truncsihi2) | |
1104 | { | |
1105 | emit_unop_insn (CODE_FOR_truncsihi2, to, from, UNKNOWN); | |
1106 | return; | |
1107 | } | |
1108 | #endif | |
1109 | convert_move (to, force_reg (from_mode, from), unsignedp); | |
1110 | return; | |
1111 | } | |
1112 | ||
1113 | if (from_mode == SImode && to_mode == QImode) | |
1114 | { | |
1115 | #ifdef HAVE_truncsiqi2 | |
1116 | if (HAVE_truncsiqi2) | |
1117 | { | |
1118 | emit_unop_insn (CODE_FOR_truncsiqi2, to, from, UNKNOWN); | |
1119 | return; | |
1120 | } | |
1121 | #endif | |
1122 | convert_move (to, force_reg (from_mode, from), unsignedp); | |
1123 | return; | |
1124 | } | |
1125 | ||
1126 | if (from_mode == HImode && to_mode == QImode) | |
1127 | { | |
1128 | #ifdef HAVE_trunchiqi2 | |
1129 | if (HAVE_trunchiqi2) | |
1130 | { | |
1131 | emit_unop_insn (CODE_FOR_trunchiqi2, to, from, UNKNOWN); | |
1132 | return; | |
1133 | } | |
1134 | #endif | |
1135 | convert_move (to, force_reg (from_mode, from), unsignedp); | |
1136 | return; | |
1137 | } | |
1138 | ||
1139 | /* Handle truncation of volatile memrefs, and so on; | |
1140 | the things that couldn't be truncated directly, | |
1141 | and for which there was no special instruction. */ | |
1142 | if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode)) | |
1143 | { | |
1144 | rtx temp = force_reg (to_mode, gen_lowpart (to_mode, from)); | |
1145 | emit_move_insn (to, temp); | |
1146 | return; | |
1147 | } | |
1148 | ||
1149 | /* Mode combination is not recognized. */ | |
1150 | abort (); | |
1151 | } | |
1152 | ||
1153 | /* Return an rtx for a value that would result | |
1154 | from converting X to mode MODE. | |
1155 | Both X and MODE may be floating, or both integer. | |
1156 | UNSIGNEDP is nonzero if X is an unsigned value. | |
1157 | This can be done by referring to a part of X in place | |
5d901c31 RS |
1158 | or by copying to a new temporary with conversion. |
1159 | ||
1160 | This function *must not* call protect_from_queue | |
1161 | except when putting X into an insn (in which case convert_move does it). */ | |
bbf6f052 RK |
1162 | |
1163 | rtx | |
1164 | convert_to_mode (mode, x, unsignedp) | |
1165 | enum machine_mode mode; | |
1166 | rtx x; | |
1167 | int unsignedp; | |
5ffe63ed RS |
1168 | { |
1169 | return convert_modes (mode, VOIDmode, x, unsignedp); | |
1170 | } | |
1171 | ||
1172 | /* Return an rtx for a value that would result | |
1173 | from converting X from mode OLDMODE to mode MODE. | |
1174 | Both modes may be floating, or both integer. | |
1175 | UNSIGNEDP is nonzero if X is an unsigned value. | |
1176 | ||
1177 | This can be done by referring to a part of X in place | |
1178 | or by copying to a new temporary with conversion. | |
1179 | ||
1180 | You can give VOIDmode for OLDMODE, if you are sure X has a nonvoid mode. | |
1181 | ||
1182 | This function *must not* call protect_from_queue | |
1183 | except when putting X into an insn (in which case convert_move does it). */ | |
1184 | ||
1185 | rtx | |
1186 | convert_modes (mode, oldmode, x, unsignedp) | |
1187 | enum machine_mode mode, oldmode; | |
1188 | rtx x; | |
1189 | int unsignedp; | |
bbf6f052 RK |
1190 | { |
1191 | register rtx temp; | |
5ffe63ed | 1192 | |
1499e0a8 RK |
1193 | /* If FROM is a SUBREG that indicates that we have already done at least |
1194 | the required extension, strip it. */ | |
1195 | ||
1196 | if (GET_CODE (x) == SUBREG && SUBREG_PROMOTED_VAR_P (x) | |
1197 | && GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) >= GET_MODE_SIZE (mode) | |
1198 | && SUBREG_PROMOTED_UNSIGNED_P (x) == unsignedp) | |
1199 | x = gen_lowpart (mode, x); | |
bbf6f052 | 1200 | |
64791b18 RK |
1201 | if (GET_MODE (x) != VOIDmode) |
1202 | oldmode = GET_MODE (x); | |
1203 | ||
5ffe63ed | 1204 | if (mode == oldmode) |
bbf6f052 RK |
1205 | return x; |
1206 | ||
1207 | /* There is one case that we must handle specially: If we are converting | |
906c4e36 | 1208 | a CONST_INT into a mode whose size is twice HOST_BITS_PER_WIDE_INT and |
bbf6f052 RK |
1209 | we are to interpret the constant as unsigned, gen_lowpart will do |
1210 | the wrong if the constant appears negative. What we want to do is | |
1211 | make the high-order word of the constant zero, not all ones. */ | |
1212 | ||
1213 | if (unsignedp && GET_MODE_CLASS (mode) == MODE_INT | |
906c4e36 | 1214 | && GET_MODE_BITSIZE (mode) == 2 * HOST_BITS_PER_WIDE_INT |
bbf6f052 | 1215 | && GET_CODE (x) == CONST_INT && INTVAL (x) < 0) |
906c4e36 | 1216 | return immed_double_const (INTVAL (x), (HOST_WIDE_INT) 0, mode); |
bbf6f052 RK |
1217 | |
1218 | /* We can do this with a gen_lowpart if both desired and current modes | |
1219 | are integer, and this is either a constant integer, a register, or a | |
ba2e110c RK |
1220 | non-volatile MEM. Except for the constant case where MODE is no |
1221 | wider than HOST_BITS_PER_WIDE_INT, we must be narrowing the operand. */ | |
bbf6f052 | 1222 | |
ba2e110c RK |
1223 | if ((GET_CODE (x) == CONST_INT |
1224 | && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT) | |
bbf6f052 | 1225 | || (GET_MODE_CLASS (mode) == MODE_INT |
5ffe63ed | 1226 | && GET_MODE_CLASS (oldmode) == MODE_INT |
bbf6f052 | 1227 | && (GET_CODE (x) == CONST_DOUBLE |
5ffe63ed | 1228 | || (GET_MODE_SIZE (mode) <= GET_MODE_SIZE (oldmode) |
d57c66da JW |
1229 | && ((GET_CODE (x) == MEM && ! MEM_VOLATILE_P (x) |
1230 | && direct_load[(int) mode]) | |
2bf29316 JW |
1231 | || (GET_CODE (x) == REG |
1232 | && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode), | |
1233 | GET_MODE_BITSIZE (GET_MODE (x))))))))) | |
ba2e110c RK |
1234 | { |
1235 | /* ?? If we don't know OLDMODE, we have to assume here that | |
1236 | X does not need sign- or zero-extension. This may not be | |
1237 | the case, but it's the best we can do. */ | |
1238 | if (GET_CODE (x) == CONST_INT && oldmode != VOIDmode | |
1239 | && GET_MODE_SIZE (mode) > GET_MODE_SIZE (oldmode)) | |
1240 | { | |
1241 | HOST_WIDE_INT val = INTVAL (x); | |
1242 | int width = GET_MODE_BITSIZE (oldmode); | |
1243 | ||
1244 | /* We must sign or zero-extend in this case. Start by | |
1245 | zero-extending, then sign extend if we need to. */ | |
1246 | val &= ((HOST_WIDE_INT) 1 << width) - 1; | |
1247 | if (! unsignedp | |
1248 | && (val & ((HOST_WIDE_INT) 1 << (width - 1)))) | |
1249 | val |= (HOST_WIDE_INT) (-1) << width; | |
1250 | ||
1251 | return GEN_INT (val); | |
1252 | } | |
1253 | ||
1254 | return gen_lowpart (mode, x); | |
1255 | } | |
bbf6f052 RK |
1256 | |
1257 | temp = gen_reg_rtx (mode); | |
1258 | convert_move (temp, x, unsignedp); | |
1259 | return temp; | |
1260 | } | |
1261 | \f | |
1262 | /* Generate several move instructions to copy LEN bytes | |
1263 | from block FROM to block TO. (These are MEM rtx's with BLKmode). | |
1264 | The caller must pass FROM and TO | |
1265 | through protect_from_queue before calling. | |
1266 | ALIGN (in bytes) is maximum alignment we can assume. */ | |
1267 | ||
bbf6f052 RK |
1268 | static void |
1269 | move_by_pieces (to, from, len, align) | |
1270 | rtx to, from; | |
1271 | int len, align; | |
1272 | { | |
1273 | struct move_by_pieces data; | |
1274 | rtx to_addr = XEXP (to, 0), from_addr = XEXP (from, 0); | |
e87b4f3f | 1275 | int max_size = MOVE_MAX + 1; |
bbf6f052 RK |
1276 | |
1277 | data.offset = 0; | |
1278 | data.to_addr = to_addr; | |
1279 | data.from_addr = from_addr; | |
1280 | data.to = to; | |
1281 | data.from = from; | |
1282 | data.autinc_to | |
1283 | = (GET_CODE (to_addr) == PRE_INC || GET_CODE (to_addr) == PRE_DEC | |
1284 | || GET_CODE (to_addr) == POST_INC || GET_CODE (to_addr) == POST_DEC); | |
1285 | data.autinc_from | |
1286 | = (GET_CODE (from_addr) == PRE_INC || GET_CODE (from_addr) == PRE_DEC | |
1287 | || GET_CODE (from_addr) == POST_INC | |
1288 | || GET_CODE (from_addr) == POST_DEC); | |
1289 | ||
1290 | data.explicit_inc_from = 0; | |
1291 | data.explicit_inc_to = 0; | |
1292 | data.reverse | |
1293 | = (GET_CODE (to_addr) == PRE_DEC || GET_CODE (to_addr) == POST_DEC); | |
1294 | if (data.reverse) data.offset = len; | |
1295 | data.len = len; | |
1296 | ||
1297 | /* If copying requires more than two move insns, | |
1298 | copy addresses to registers (to make displacements shorter) | |
1299 | and use post-increment if available. */ | |
1300 | if (!(data.autinc_from && data.autinc_to) | |
1301 | && move_by_pieces_ninsns (len, align) > 2) | |
1302 | { | |
1303 | #ifdef HAVE_PRE_DECREMENT | |
1304 | if (data.reverse && ! data.autinc_from) | |
1305 | { | |
1306 | data.from_addr = copy_addr_to_reg (plus_constant (from_addr, len)); | |
1307 | data.autinc_from = 1; | |
1308 | data.explicit_inc_from = -1; | |
1309 | } | |
1310 | #endif | |
1311 | #ifdef HAVE_POST_INCREMENT | |
1312 | if (! data.autinc_from) | |
1313 | { | |
1314 | data.from_addr = copy_addr_to_reg (from_addr); | |
1315 | data.autinc_from = 1; | |
1316 | data.explicit_inc_from = 1; | |
1317 | } | |
1318 | #endif | |
1319 | if (!data.autinc_from && CONSTANT_P (from_addr)) | |
1320 | data.from_addr = copy_addr_to_reg (from_addr); | |
1321 | #ifdef HAVE_PRE_DECREMENT | |
1322 | if (data.reverse && ! data.autinc_to) | |
1323 | { | |
1324 | data.to_addr = copy_addr_to_reg (plus_constant (to_addr, len)); | |
1325 | data.autinc_to = 1; | |
1326 | data.explicit_inc_to = -1; | |
1327 | } | |
1328 | #endif | |
1329 | #ifdef HAVE_POST_INCREMENT | |
1330 | if (! data.reverse && ! data.autinc_to) | |
1331 | { | |
1332 | data.to_addr = copy_addr_to_reg (to_addr); | |
1333 | data.autinc_to = 1; | |
1334 | data.explicit_inc_to = 1; | |
1335 | } | |
1336 | #endif | |
1337 | if (!data.autinc_to && CONSTANT_P (to_addr)) | |
1338 | data.to_addr = copy_addr_to_reg (to_addr); | |
1339 | } | |
1340 | ||
e87b4f3f RS |
1341 | if (! (STRICT_ALIGNMENT || SLOW_UNALIGNED_ACCESS) |
1342 | || align > MOVE_MAX || align >= BIGGEST_ALIGNMENT / BITS_PER_UNIT) | |
bbf6f052 | 1343 | align = MOVE_MAX; |
bbf6f052 RK |
1344 | |
1345 | /* First move what we can in the largest integer mode, then go to | |
1346 | successively smaller modes. */ | |
1347 | ||
1348 | while (max_size > 1) | |
1349 | { | |
1350 | enum machine_mode mode = VOIDmode, tmode; | |
1351 | enum insn_code icode; | |
1352 | ||
e7c33f54 RK |
1353 | for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT); |
1354 | tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode)) | |
1355 | if (GET_MODE_SIZE (tmode) < max_size) | |
bbf6f052 RK |
1356 | mode = tmode; |
1357 | ||
1358 | if (mode == VOIDmode) | |
1359 | break; | |
1360 | ||
1361 | icode = mov_optab->handlers[(int) mode].insn_code; | |
1362 | if (icode != CODE_FOR_nothing | |
1363 | && align >= MIN (BIGGEST_ALIGNMENT / BITS_PER_UNIT, | |
1364 | GET_MODE_SIZE (mode))) | |
1365 | move_by_pieces_1 (GEN_FCN (icode), mode, &data); | |
1366 | ||
1367 | max_size = GET_MODE_SIZE (mode); | |
1368 | } | |
1369 | ||
1370 | /* The code above should have handled everything. */ | |
1371 | if (data.len != 0) | |
1372 | abort (); | |
1373 | } | |
1374 | ||
1375 | /* Return number of insns required to move L bytes by pieces. | |
1376 | ALIGN (in bytes) is maximum alignment we can assume. */ | |
1377 | ||
1378 | static int | |
1379 | move_by_pieces_ninsns (l, align) | |
1380 | unsigned int l; | |
1381 | int align; | |
1382 | { | |
1383 | register int n_insns = 0; | |
e87b4f3f | 1384 | int max_size = MOVE_MAX + 1; |
bbf6f052 | 1385 | |
e87b4f3f RS |
1386 | if (! (STRICT_ALIGNMENT || SLOW_UNALIGNED_ACCESS) |
1387 | || align > MOVE_MAX || align >= BIGGEST_ALIGNMENT / BITS_PER_UNIT) | |
bbf6f052 | 1388 | align = MOVE_MAX; |
bbf6f052 RK |
1389 | |
1390 | while (max_size > 1) | |
1391 | { | |
1392 | enum machine_mode mode = VOIDmode, tmode; | |
1393 | enum insn_code icode; | |
1394 | ||
e7c33f54 RK |
1395 | for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT); |
1396 | tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode)) | |
1397 | if (GET_MODE_SIZE (tmode) < max_size) | |
bbf6f052 RK |
1398 | mode = tmode; |
1399 | ||
1400 | if (mode == VOIDmode) | |
1401 | break; | |
1402 | ||
1403 | icode = mov_optab->handlers[(int) mode].insn_code; | |
1404 | if (icode != CODE_FOR_nothing | |
1405 | && align >= MIN (BIGGEST_ALIGNMENT / BITS_PER_UNIT, | |
1406 | GET_MODE_SIZE (mode))) | |
1407 | n_insns += l / GET_MODE_SIZE (mode), l %= GET_MODE_SIZE (mode); | |
1408 | ||
1409 | max_size = GET_MODE_SIZE (mode); | |
1410 | } | |
1411 | ||
1412 | return n_insns; | |
1413 | } | |
1414 | ||
1415 | /* Subroutine of move_by_pieces. Move as many bytes as appropriate | |
1416 | with move instructions for mode MODE. GENFUN is the gen_... function | |
1417 | to make a move insn for that mode. DATA has all the other info. */ | |
1418 | ||
1419 | static void | |
1420 | move_by_pieces_1 (genfun, mode, data) | |
1421 | rtx (*genfun) (); | |
1422 | enum machine_mode mode; | |
1423 | struct move_by_pieces *data; | |
1424 | { | |
1425 | register int size = GET_MODE_SIZE (mode); | |
1426 | register rtx to1, from1; | |
1427 | ||
1428 | while (data->len >= size) | |
1429 | { | |
1430 | if (data->reverse) data->offset -= size; | |
1431 | ||
1432 | to1 = (data->autinc_to | |
1433 | ? gen_rtx (MEM, mode, data->to_addr) | |
1434 | : change_address (data->to, mode, | |
1435 | plus_constant (data->to_addr, data->offset))); | |
1436 | from1 = | |
1437 | (data->autinc_from | |
1438 | ? gen_rtx (MEM, mode, data->from_addr) | |
1439 | : change_address (data->from, mode, | |
1440 | plus_constant (data->from_addr, data->offset))); | |
1441 | ||
1442 | #ifdef HAVE_PRE_DECREMENT | |
1443 | if (data->explicit_inc_to < 0) | |
906c4e36 | 1444 | emit_insn (gen_add2_insn (data->to_addr, GEN_INT (-size))); |
bbf6f052 | 1445 | if (data->explicit_inc_from < 0) |
906c4e36 | 1446 | emit_insn (gen_add2_insn (data->from_addr, GEN_INT (-size))); |
bbf6f052 RK |
1447 | #endif |
1448 | ||
1449 | emit_insn ((*genfun) (to1, from1)); | |
1450 | #ifdef HAVE_POST_INCREMENT | |
1451 | if (data->explicit_inc_to > 0) | |
906c4e36 | 1452 | emit_insn (gen_add2_insn (data->to_addr, GEN_INT (size))); |
bbf6f052 | 1453 | if (data->explicit_inc_from > 0) |
906c4e36 | 1454 | emit_insn (gen_add2_insn (data->from_addr, GEN_INT (size))); |
bbf6f052 RK |
1455 | #endif |
1456 | ||
1457 | if (! data->reverse) data->offset += size; | |
1458 | ||
1459 | data->len -= size; | |
1460 | } | |
1461 | } | |
1462 | \f | |
1463 | /* Emit code to move a block Y to a block X. | |
1464 | This may be done with string-move instructions, | |
1465 | with multiple scalar move instructions, or with a library call. | |
1466 | ||
1467 | Both X and Y must be MEM rtx's (perhaps inside VOLATILE) | |
1468 | with mode BLKmode. | |
1469 | SIZE is an rtx that says how long they are. | |
1470 | ALIGN is the maximum alignment we can assume they have, | |
1471 | measured in bytes. */ | |
1472 | ||
1473 | void | |
1474 | emit_block_move (x, y, size, align) | |
1475 | rtx x, y; | |
1476 | rtx size; | |
1477 | int align; | |
1478 | { | |
1479 | if (GET_MODE (x) != BLKmode) | |
1480 | abort (); | |
1481 | ||
1482 | if (GET_MODE (y) != BLKmode) | |
1483 | abort (); | |
1484 | ||
1485 | x = protect_from_queue (x, 1); | |
1486 | y = protect_from_queue (y, 0); | |
5d901c31 | 1487 | size = protect_from_queue (size, 0); |
bbf6f052 RK |
1488 | |
1489 | if (GET_CODE (x) != MEM) | |
1490 | abort (); | |
1491 | if (GET_CODE (y) != MEM) | |
1492 | abort (); | |
1493 | if (size == 0) | |
1494 | abort (); | |
1495 | ||
1496 | if (GET_CODE (size) == CONST_INT | |
906c4e36 | 1497 | && (move_by_pieces_ninsns (INTVAL (size), align) < MOVE_RATIO)) |
bbf6f052 RK |
1498 | move_by_pieces (x, y, INTVAL (size), align); |
1499 | else | |
1500 | { | |
1501 | /* Try the most limited insn first, because there's no point | |
1502 | including more than one in the machine description unless | |
1503 | the more limited one has some advantage. */ | |
266007a7 | 1504 | |
0bba3f6f | 1505 | rtx opalign = GEN_INT (align); |
266007a7 RK |
1506 | enum machine_mode mode; |
1507 | ||
1508 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode; | |
1509 | mode = GET_MODE_WIDER_MODE (mode)) | |
bbf6f052 | 1510 | { |
266007a7 | 1511 | enum insn_code code = movstr_optab[(int) mode]; |
266007a7 RK |
1512 | |
1513 | if (code != CODE_FOR_nothing | |
803090c4 RK |
1514 | /* We don't need MODE to be narrower than BITS_PER_HOST_WIDE_INT |
1515 | here because if SIZE is less than the mode mask, as it is | |
8008b228 | 1516 | returned by the macro, it will definitely be less than the |
803090c4 | 1517 | actual mode mask. */ |
f85b95d1 | 1518 | && (unsigned HOST_WIDE_INT) INTVAL (size) <= GET_MODE_MASK (mode) |
0bba3f6f RK |
1519 | && (insn_operand_predicate[(int) code][0] == 0 |
1520 | || (*insn_operand_predicate[(int) code][0]) (x, BLKmode)) | |
1521 | && (insn_operand_predicate[(int) code][1] == 0 | |
1522 | || (*insn_operand_predicate[(int) code][1]) (y, BLKmode)) | |
1523 | && (insn_operand_predicate[(int) code][3] == 0 | |
1524 | || (*insn_operand_predicate[(int) code][3]) (opalign, | |
1525 | VOIDmode))) | |
bbf6f052 | 1526 | { |
1ba1e2a8 | 1527 | rtx op2; |
266007a7 RK |
1528 | rtx last = get_last_insn (); |
1529 | rtx pat; | |
1530 | ||
1ba1e2a8 | 1531 | op2 = convert_to_mode (mode, size, 1); |
0bba3f6f RK |
1532 | if (insn_operand_predicate[(int) code][2] != 0 |
1533 | && ! (*insn_operand_predicate[(int) code][2]) (op2, mode)) | |
266007a7 RK |
1534 | op2 = copy_to_mode_reg (mode, op2); |
1535 | ||
1536 | pat = GEN_FCN ((int) code) (x, y, op2, opalign); | |
1537 | if (pat) | |
1538 | { | |
1539 | emit_insn (pat); | |
1540 | return; | |
1541 | } | |
1542 | else | |
1543 | delete_insns_since (last); | |
bbf6f052 RK |
1544 | } |
1545 | } | |
bbf6f052 RK |
1546 | |
1547 | #ifdef TARGET_MEM_FUNCTIONS | |
d562e42e | 1548 | emit_library_call (memcpy_libfunc, 0, |
bbf6f052 RK |
1549 | VOIDmode, 3, XEXP (x, 0), Pmode, |
1550 | XEXP (y, 0), Pmode, | |
0fa83258 RK |
1551 | convert_to_mode (TYPE_MODE (sizetype), size, |
1552 | TREE_UNSIGNED (sizetype)), | |
1553 | TYPE_MODE (sizetype)); | |
bbf6f052 | 1554 | #else |
d562e42e | 1555 | emit_library_call (bcopy_libfunc, 0, |
bbf6f052 RK |
1556 | VOIDmode, 3, XEXP (y, 0), Pmode, |
1557 | XEXP (x, 0), Pmode, | |
0fa83258 RK |
1558 | convert_to_mode (TYPE_MODE (sizetype), size, |
1559 | TREE_UNSIGNED (sizetype)), | |
1560 | TYPE_MODE (sizetype)); | |
bbf6f052 RK |
1561 | #endif |
1562 | } | |
1563 | } | |
1564 | \f | |
1565 | /* Copy all or part of a value X into registers starting at REGNO. | |
1566 | The number of registers to be filled is NREGS. */ | |
1567 | ||
1568 | void | |
1569 | move_block_to_reg (regno, x, nregs, mode) | |
1570 | int regno; | |
1571 | rtx x; | |
1572 | int nregs; | |
1573 | enum machine_mode mode; | |
1574 | { | |
1575 | int i; | |
1576 | rtx pat, last; | |
1577 | ||
1578 | if (CONSTANT_P (x) && ! LEGITIMATE_CONSTANT_P (x)) | |
1579 | x = validize_mem (force_const_mem (mode, x)); | |
1580 | ||
1581 | /* See if the machine can do this with a load multiple insn. */ | |
1582 | #ifdef HAVE_load_multiple | |
c3a02afe | 1583 | if (HAVE_load_multiple) |
bbf6f052 | 1584 | { |
c3a02afe RK |
1585 | last = get_last_insn (); |
1586 | pat = gen_load_multiple (gen_rtx (REG, word_mode, regno), x, | |
1587 | GEN_INT (nregs)); | |
1588 | if (pat) | |
1589 | { | |
1590 | emit_insn (pat); | |
1591 | return; | |
1592 | } | |
1593 | else | |
1594 | delete_insns_since (last); | |
bbf6f052 | 1595 | } |
bbf6f052 RK |
1596 | #endif |
1597 | ||
1598 | for (i = 0; i < nregs; i++) | |
1599 | emit_move_insn (gen_rtx (REG, word_mode, regno + i), | |
1600 | operand_subword_force (x, i, mode)); | |
1601 | } | |
1602 | ||
1603 | /* Copy all or part of a BLKmode value X out of registers starting at REGNO. | |
0040593d JW |
1604 | The number of registers to be filled is NREGS. SIZE indicates the number |
1605 | of bytes in the object X. */ | |
1606 | ||
bbf6f052 RK |
1607 | |
1608 | void | |
0040593d | 1609 | move_block_from_reg (regno, x, nregs, size) |
bbf6f052 RK |
1610 | int regno; |
1611 | rtx x; | |
1612 | int nregs; | |
0040593d | 1613 | int size; |
bbf6f052 RK |
1614 | { |
1615 | int i; | |
1616 | rtx pat, last; | |
1617 | ||
0040593d JW |
1618 | /* Blocks smaller than a word on a BYTES_BIG_ENDIAN machine must be aligned |
1619 | to the left before storing to memory. */ | |
1620 | if (size < UNITS_PER_WORD && BYTES_BIG_ENDIAN) | |
1621 | { | |
1622 | rtx tem = operand_subword (x, 0, 1, BLKmode); | |
1623 | rtx shift; | |
1624 | ||
1625 | if (tem == 0) | |
1626 | abort (); | |
1627 | ||
1628 | shift = expand_shift (LSHIFT_EXPR, word_mode, | |
1629 | gen_rtx (REG, word_mode, regno), | |
1630 | build_int_2 ((UNITS_PER_WORD - size) | |
1631 | * BITS_PER_UNIT, 0), NULL_RTX, 0); | |
1632 | emit_move_insn (tem, shift); | |
1633 | return; | |
1634 | } | |
1635 | ||
bbf6f052 RK |
1636 | /* See if the machine can do this with a store multiple insn. */ |
1637 | #ifdef HAVE_store_multiple | |
c3a02afe | 1638 | if (HAVE_store_multiple) |
bbf6f052 | 1639 | { |
c3a02afe RK |
1640 | last = get_last_insn (); |
1641 | pat = gen_store_multiple (x, gen_rtx (REG, word_mode, regno), | |
1642 | GEN_INT (nregs)); | |
1643 | if (pat) | |
1644 | { | |
1645 | emit_insn (pat); | |
1646 | return; | |
1647 | } | |
1648 | else | |
1649 | delete_insns_since (last); | |
bbf6f052 | 1650 | } |
bbf6f052 RK |
1651 | #endif |
1652 | ||
1653 | for (i = 0; i < nregs; i++) | |
1654 | { | |
1655 | rtx tem = operand_subword (x, i, 1, BLKmode); | |
1656 | ||
1657 | if (tem == 0) | |
1658 | abort (); | |
1659 | ||
1660 | emit_move_insn (tem, gen_rtx (REG, word_mode, regno + i)); | |
1661 | } | |
1662 | } | |
1663 | ||
1664 | /* Mark NREGS consecutive regs, starting at REGNO, as being live now. */ | |
1665 | ||
1666 | void | |
1667 | use_regs (regno, nregs) | |
1668 | int regno; | |
1669 | int nregs; | |
1670 | { | |
1671 | int i; | |
1672 | ||
1673 | for (i = 0; i < nregs; i++) | |
1674 | emit_insn (gen_rtx (USE, VOIDmode, gen_rtx (REG, word_mode, regno + i))); | |
1675 | } | |
1676 | \f | |
1677 | /* Write zeros through the storage of OBJECT. | |
1678 | If OBJECT has BLKmode, SIZE is its length in bytes. */ | |
1679 | ||
1680 | void | |
1681 | clear_storage (object, size) | |
1682 | rtx object; | |
1683 | int size; | |
1684 | { | |
1685 | if (GET_MODE (object) == BLKmode) | |
1686 | { | |
1687 | #ifdef TARGET_MEM_FUNCTIONS | |
d562e42e | 1688 | emit_library_call (memset_libfunc, 0, |
bbf6f052 RK |
1689 | VOIDmode, 3, |
1690 | XEXP (object, 0), Pmode, const0_rtx, Pmode, | |
906c4e36 | 1691 | GEN_INT (size), Pmode); |
bbf6f052 | 1692 | #else |
d562e42e | 1693 | emit_library_call (bzero_libfunc, 0, |
bbf6f052 RK |
1694 | VOIDmode, 2, |
1695 | XEXP (object, 0), Pmode, | |
906c4e36 | 1696 | GEN_INT (size), Pmode); |
bbf6f052 RK |
1697 | #endif |
1698 | } | |
1699 | else | |
1700 | emit_move_insn (object, const0_rtx); | |
1701 | } | |
1702 | ||
1703 | /* Generate code to copy Y into X. | |
1704 | Both Y and X must have the same mode, except that | |
1705 | Y can be a constant with VOIDmode. | |
1706 | This mode cannot be BLKmode; use emit_block_move for that. | |
1707 | ||
1708 | Return the last instruction emitted. */ | |
1709 | ||
1710 | rtx | |
1711 | emit_move_insn (x, y) | |
1712 | rtx x, y; | |
1713 | { | |
1714 | enum machine_mode mode = GET_MODE (x); | |
bbf6f052 RK |
1715 | |
1716 | x = protect_from_queue (x, 1); | |
1717 | y = protect_from_queue (y, 0); | |
1718 | ||
1719 | if (mode == BLKmode || (GET_MODE (y) != mode && GET_MODE (y) != VOIDmode)) | |
1720 | abort (); | |
1721 | ||
1722 | if (CONSTANT_P (y) && ! LEGITIMATE_CONSTANT_P (y)) | |
1723 | y = force_const_mem (mode, y); | |
1724 | ||
1725 | /* If X or Y are memory references, verify that their addresses are valid | |
1726 | for the machine. */ | |
1727 | if (GET_CODE (x) == MEM | |
1728 | && ((! memory_address_p (GET_MODE (x), XEXP (x, 0)) | |
1729 | && ! push_operand (x, GET_MODE (x))) | |
1730 | || (flag_force_addr | |
1731 | && CONSTANT_ADDRESS_P (XEXP (x, 0))))) | |
1732 | x = change_address (x, VOIDmode, XEXP (x, 0)); | |
1733 | ||
1734 | if (GET_CODE (y) == MEM | |
1735 | && (! memory_address_p (GET_MODE (y), XEXP (y, 0)) | |
1736 | || (flag_force_addr | |
1737 | && CONSTANT_ADDRESS_P (XEXP (y, 0))))) | |
1738 | y = change_address (y, VOIDmode, XEXP (y, 0)); | |
1739 | ||
1740 | if (mode == BLKmode) | |
1741 | abort (); | |
1742 | ||
261c4230 RS |
1743 | return emit_move_insn_1 (x, y); |
1744 | } | |
1745 | ||
1746 | /* Low level part of emit_move_insn. | |
1747 | Called just like emit_move_insn, but assumes X and Y | |
1748 | are basically valid. */ | |
1749 | ||
1750 | rtx | |
1751 | emit_move_insn_1 (x, y) | |
1752 | rtx x, y; | |
1753 | { | |
1754 | enum machine_mode mode = GET_MODE (x); | |
1755 | enum machine_mode submode; | |
1756 | enum mode_class class = GET_MODE_CLASS (mode); | |
1757 | int i; | |
1758 | ||
bbf6f052 RK |
1759 | if (mov_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing) |
1760 | return | |
1761 | emit_insn (GEN_FCN (mov_optab->handlers[(int) mode].insn_code) (x, y)); | |
1762 | ||
89742723 | 1763 | /* Expand complex moves by moving real part and imag part, if possible. */ |
7308a047 | 1764 | else if ((class == MODE_COMPLEX_FLOAT || class == MODE_COMPLEX_INT) |
d0c76654 RK |
1765 | && BLKmode != (submode = mode_for_size ((GET_MODE_UNIT_SIZE (mode) |
1766 | * BITS_PER_UNIT), | |
1767 | (class == MODE_COMPLEX_INT | |
1768 | ? MODE_INT : MODE_FLOAT), | |
1769 | 0)) | |
7308a047 RS |
1770 | && (mov_optab->handlers[(int) submode].insn_code |
1771 | != CODE_FOR_nothing)) | |
1772 | { | |
1773 | /* Don't split destination if it is a stack push. */ | |
1774 | int stack = push_operand (x, GET_MODE (x)); | |
6551fa4d | 1775 | rtx insns; |
7308a047 | 1776 | |
6551fa4d | 1777 | start_sequence (); |
7308a047 RS |
1778 | |
1779 | /* If this is a stack, push the highpart first, so it | |
1780 | will be in the argument order. | |
1781 | ||
1782 | In that case, change_address is used only to convert | |
1783 | the mode, not to change the address. */ | |
c937357e RS |
1784 | if (stack) |
1785 | { | |
e33c0d66 RS |
1786 | /* Note that the real part always precedes the imag part in memory |
1787 | regardless of machine's endianness. */ | |
c937357e RS |
1788 | #ifdef STACK_GROWS_DOWNWARD |
1789 | emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code) | |
1790 | (gen_rtx (MEM, submode, (XEXP (x, 0))), | |
e33c0d66 | 1791 | gen_imagpart (submode, y))); |
c937357e RS |
1792 | emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code) |
1793 | (gen_rtx (MEM, submode, (XEXP (x, 0))), | |
e33c0d66 | 1794 | gen_realpart (submode, y))); |
c937357e RS |
1795 | #else |
1796 | emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code) | |
1797 | (gen_rtx (MEM, submode, (XEXP (x, 0))), | |
e33c0d66 | 1798 | gen_realpart (submode, y))); |
c937357e RS |
1799 | emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code) |
1800 | (gen_rtx (MEM, submode, (XEXP (x, 0))), | |
e33c0d66 | 1801 | gen_imagpart (submode, y))); |
c937357e RS |
1802 | #endif |
1803 | } | |
1804 | else | |
1805 | { | |
1806 | emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code) | |
976ff203 | 1807 | (gen_realpart (submode, x), gen_realpart (submode, y))); |
c937357e | 1808 | emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code) |
976ff203 | 1809 | (gen_imagpart (submode, x), gen_imagpart (submode, y))); |
c937357e | 1810 | } |
7308a047 | 1811 | |
6551fa4d JW |
1812 | insns = get_insns (); |
1813 | end_sequence (); | |
1814 | ||
1815 | /* If X is a CONCAT, we got insns like RD = RS, ID = IS, | |
1816 | each with a separate pseudo as destination. | |
1817 | It's not correct for flow to treat them as a unit. */ | |
6d6e61ce | 1818 | if (GET_CODE (x) != CONCAT) |
6551fa4d JW |
1819 | emit_no_conflict_block (insns, x, y, NULL_RTX, NULL_RTX); |
1820 | else | |
1821 | emit_insns (insns); | |
7a1ab50a RS |
1822 | |
1823 | return get_last_insn (); | |
7308a047 RS |
1824 | } |
1825 | ||
bbf6f052 RK |
1826 | /* This will handle any multi-word mode that lacks a move_insn pattern. |
1827 | However, you will get better code if you define such patterns, | |
1828 | even if they must turn into multiple assembler instructions. */ | |
a4320483 | 1829 | else if (GET_MODE_SIZE (mode) > UNITS_PER_WORD) |
bbf6f052 RK |
1830 | { |
1831 | rtx last_insn = 0; | |
6551fa4d JW |
1832 | rtx insns; |
1833 | ||
1834 | start_sequence (); | |
bbf6f052 RK |
1835 | |
1836 | for (i = 0; | |
1837 | i < (GET_MODE_SIZE (mode) + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; | |
1838 | i++) | |
1839 | { | |
1840 | rtx xpart = operand_subword (x, i, 1, mode); | |
1841 | rtx ypart = operand_subword (y, i, 1, mode); | |
1842 | ||
1843 | /* If we can't get a part of Y, put Y into memory if it is a | |
1844 | constant. Otherwise, force it into a register. If we still | |
1845 | can't get a part of Y, abort. */ | |
1846 | if (ypart == 0 && CONSTANT_P (y)) | |
1847 | { | |
1848 | y = force_const_mem (mode, y); | |
1849 | ypart = operand_subword (y, i, 1, mode); | |
1850 | } | |
1851 | else if (ypart == 0) | |
1852 | ypart = operand_subword_force (y, i, mode); | |
1853 | ||
1854 | if (xpart == 0 || ypart == 0) | |
1855 | abort (); | |
1856 | ||
1857 | last_insn = emit_move_insn (xpart, ypart); | |
1858 | } | |
6551fa4d JW |
1859 | |
1860 | insns = get_insns (); | |
1861 | end_sequence (); | |
1862 | emit_no_conflict_block (insns, x, y, NULL_RTX, NULL_RTX); | |
7308a047 | 1863 | |
bbf6f052 RK |
1864 | return last_insn; |
1865 | } | |
1866 | else | |
1867 | abort (); | |
1868 | } | |
1869 | \f | |
1870 | /* Pushing data onto the stack. */ | |
1871 | ||
1872 | /* Push a block of length SIZE (perhaps variable) | |
1873 | and return an rtx to address the beginning of the block. | |
1874 | Note that it is not possible for the value returned to be a QUEUED. | |
1875 | The value may be virtual_outgoing_args_rtx. | |
1876 | ||
1877 | EXTRA is the number of bytes of padding to push in addition to SIZE. | |
1878 | BELOW nonzero means this padding comes at low addresses; | |
1879 | otherwise, the padding comes at high addresses. */ | |
1880 | ||
1881 | rtx | |
1882 | push_block (size, extra, below) | |
1883 | rtx size; | |
1884 | int extra, below; | |
1885 | { | |
1886 | register rtx temp; | |
1887 | if (CONSTANT_P (size)) | |
1888 | anti_adjust_stack (plus_constant (size, extra)); | |
1889 | else if (GET_CODE (size) == REG && extra == 0) | |
1890 | anti_adjust_stack (size); | |
1891 | else | |
1892 | { | |
1893 | rtx temp = copy_to_mode_reg (Pmode, size); | |
1894 | if (extra != 0) | |
906c4e36 | 1895 | temp = expand_binop (Pmode, add_optab, temp, GEN_INT (extra), |
bbf6f052 RK |
1896 | temp, 0, OPTAB_LIB_WIDEN); |
1897 | anti_adjust_stack (temp); | |
1898 | } | |
1899 | ||
1900 | #ifdef STACK_GROWS_DOWNWARD | |
1901 | temp = virtual_outgoing_args_rtx; | |
1902 | if (extra != 0 && below) | |
1903 | temp = plus_constant (temp, extra); | |
1904 | #else | |
1905 | if (GET_CODE (size) == CONST_INT) | |
1906 | temp = plus_constant (virtual_outgoing_args_rtx, | |
1907 | - INTVAL (size) - (below ? 0 : extra)); | |
1908 | else if (extra != 0 && !below) | |
1909 | temp = gen_rtx (PLUS, Pmode, virtual_outgoing_args_rtx, | |
1910 | negate_rtx (Pmode, plus_constant (size, extra))); | |
1911 | else | |
1912 | temp = gen_rtx (PLUS, Pmode, virtual_outgoing_args_rtx, | |
1913 | negate_rtx (Pmode, size)); | |
1914 | #endif | |
1915 | ||
1916 | return memory_address (GET_CLASS_NARROWEST_MODE (MODE_INT), temp); | |
1917 | } | |
1918 | ||
87e38d84 | 1919 | rtx |
bbf6f052 RK |
1920 | gen_push_operand () |
1921 | { | |
1922 | return gen_rtx (STACK_PUSH_CODE, Pmode, stack_pointer_rtx); | |
1923 | } | |
1924 | ||
1925 | /* Generate code to push X onto the stack, assuming it has mode MODE and | |
1926 | type TYPE. | |
1927 | MODE is redundant except when X is a CONST_INT (since they don't | |
1928 | carry mode info). | |
1929 | SIZE is an rtx for the size of data to be copied (in bytes), | |
1930 | needed only if X is BLKmode. | |
1931 | ||
1932 | ALIGN (in bytes) is maximum alignment we can assume. | |
1933 | ||
cd048831 RK |
1934 | If PARTIAL and REG are both nonzero, then copy that many of the first |
1935 | words of X into registers starting with REG, and push the rest of X. | |
bbf6f052 RK |
1936 | The amount of space pushed is decreased by PARTIAL words, |
1937 | rounded *down* to a multiple of PARM_BOUNDARY. | |
1938 | REG must be a hard register in this case. | |
cd048831 RK |
1939 | If REG is zero but PARTIAL is not, take any all others actions for an |
1940 | argument partially in registers, but do not actually load any | |
1941 | registers. | |
bbf6f052 RK |
1942 | |
1943 | EXTRA is the amount in bytes of extra space to leave next to this arg. | |
6dc42e49 | 1944 | This is ignored if an argument block has already been allocated. |
bbf6f052 RK |
1945 | |
1946 | On a machine that lacks real push insns, ARGS_ADDR is the address of | |
1947 | the bottom of the argument block for this call. We use indexing off there | |
1948 | to store the arg. On machines with push insns, ARGS_ADDR is 0 when a | |
1949 | argument block has not been preallocated. | |
1950 | ||
1951 | ARGS_SO_FAR is the size of args previously pushed for this call. */ | |
1952 | ||
1953 | void | |
1954 | emit_push_insn (x, mode, type, size, align, partial, reg, extra, | |
1955 | args_addr, args_so_far) | |
1956 | register rtx x; | |
1957 | enum machine_mode mode; | |
1958 | tree type; | |
1959 | rtx size; | |
1960 | int align; | |
1961 | int partial; | |
1962 | rtx reg; | |
1963 | int extra; | |
1964 | rtx args_addr; | |
1965 | rtx args_so_far; | |
1966 | { | |
1967 | rtx xinner; | |
1968 | enum direction stack_direction | |
1969 | #ifdef STACK_GROWS_DOWNWARD | |
1970 | = downward; | |
1971 | #else | |
1972 | = upward; | |
1973 | #endif | |
1974 | ||
1975 | /* Decide where to pad the argument: `downward' for below, | |
1976 | `upward' for above, or `none' for don't pad it. | |
1977 | Default is below for small data on big-endian machines; else above. */ | |
1978 | enum direction where_pad = FUNCTION_ARG_PADDING (mode, type); | |
1979 | ||
1980 | /* Invert direction if stack is post-update. */ | |
1981 | if (STACK_PUSH_CODE == POST_INC || STACK_PUSH_CODE == POST_DEC) | |
1982 | if (where_pad != none) | |
1983 | where_pad = (where_pad == downward ? upward : downward); | |
1984 | ||
1985 | xinner = x = protect_from_queue (x, 0); | |
1986 | ||
1987 | if (mode == BLKmode) | |
1988 | { | |
1989 | /* Copy a block into the stack, entirely or partially. */ | |
1990 | ||
1991 | register rtx temp; | |
1992 | int used = partial * UNITS_PER_WORD; | |
1993 | int offset = used % (PARM_BOUNDARY / BITS_PER_UNIT); | |
1994 | int skip; | |
1995 | ||
1996 | if (size == 0) | |
1997 | abort (); | |
1998 | ||
1999 | used -= offset; | |
2000 | ||
2001 | /* USED is now the # of bytes we need not copy to the stack | |
2002 | because registers will take care of them. */ | |
2003 | ||
2004 | if (partial != 0) | |
2005 | xinner = change_address (xinner, BLKmode, | |
2006 | plus_constant (XEXP (xinner, 0), used)); | |
2007 | ||
2008 | /* If the partial register-part of the arg counts in its stack size, | |
2009 | skip the part of stack space corresponding to the registers. | |
2010 | Otherwise, start copying to the beginning of the stack space, | |
2011 | by setting SKIP to 0. */ | |
2012 | #ifndef REG_PARM_STACK_SPACE | |
2013 | skip = 0; | |
2014 | #else | |
2015 | skip = used; | |
2016 | #endif | |
2017 | ||
2018 | #ifdef PUSH_ROUNDING | |
2019 | /* Do it with several push insns if that doesn't take lots of insns | |
2020 | and if there is no difficulty with push insns that skip bytes | |
2021 | on the stack for alignment purposes. */ | |
2022 | if (args_addr == 0 | |
2023 | && GET_CODE (size) == CONST_INT | |
2024 | && skip == 0 | |
2025 | && (move_by_pieces_ninsns ((unsigned) INTVAL (size) - used, align) | |
2026 | < MOVE_RATIO) | |
bbf6f052 RK |
2027 | /* Here we avoid the case of a structure whose weak alignment |
2028 | forces many pushes of a small amount of data, | |
2029 | and such small pushes do rounding that causes trouble. */ | |
e87b4f3f RS |
2030 | && ((! STRICT_ALIGNMENT && ! SLOW_UNALIGNED_ACCESS) |
2031 | || align >= BIGGEST_ALIGNMENT / BITS_PER_UNIT | |
bbf6f052 | 2032 | || PUSH_ROUNDING (align) == align) |
bbf6f052 RK |
2033 | && PUSH_ROUNDING (INTVAL (size)) == INTVAL (size)) |
2034 | { | |
2035 | /* Push padding now if padding above and stack grows down, | |
2036 | or if padding below and stack grows up. | |
2037 | But if space already allocated, this has already been done. */ | |
2038 | if (extra && args_addr == 0 | |
2039 | && where_pad != none && where_pad != stack_direction) | |
906c4e36 | 2040 | anti_adjust_stack (GEN_INT (extra)); |
bbf6f052 RK |
2041 | |
2042 | move_by_pieces (gen_rtx (MEM, BLKmode, gen_push_operand ()), xinner, | |
2043 | INTVAL (size) - used, align); | |
2044 | } | |
2045 | else | |
2046 | #endif /* PUSH_ROUNDING */ | |
2047 | { | |
2048 | /* Otherwise make space on the stack and copy the data | |
2049 | to the address of that space. */ | |
2050 | ||
2051 | /* Deduct words put into registers from the size we must copy. */ | |
2052 | if (partial != 0) | |
2053 | { | |
2054 | if (GET_CODE (size) == CONST_INT) | |
906c4e36 | 2055 | size = GEN_INT (INTVAL (size) - used); |
bbf6f052 RK |
2056 | else |
2057 | size = expand_binop (GET_MODE (size), sub_optab, size, | |
906c4e36 RK |
2058 | GEN_INT (used), NULL_RTX, 0, |
2059 | OPTAB_LIB_WIDEN); | |
bbf6f052 RK |
2060 | } |
2061 | ||
2062 | /* Get the address of the stack space. | |
2063 | In this case, we do not deal with EXTRA separately. | |
2064 | A single stack adjust will do. */ | |
2065 | if (! args_addr) | |
2066 | { | |
2067 | temp = push_block (size, extra, where_pad == downward); | |
2068 | extra = 0; | |
2069 | } | |
2070 | else if (GET_CODE (args_so_far) == CONST_INT) | |
2071 | temp = memory_address (BLKmode, | |
2072 | plus_constant (args_addr, | |
2073 | skip + INTVAL (args_so_far))); | |
2074 | else | |
2075 | temp = memory_address (BLKmode, | |
2076 | plus_constant (gen_rtx (PLUS, Pmode, | |
2077 | args_addr, args_so_far), | |
2078 | skip)); | |
2079 | ||
2080 | /* TEMP is the address of the block. Copy the data there. */ | |
2081 | if (GET_CODE (size) == CONST_INT | |
2082 | && (move_by_pieces_ninsns ((unsigned) INTVAL (size), align) | |
2083 | < MOVE_RATIO)) | |
2084 | { | |
2085 | move_by_pieces (gen_rtx (MEM, BLKmode, temp), xinner, | |
2086 | INTVAL (size), align); | |
2087 | goto ret; | |
2088 | } | |
2089 | /* Try the most limited insn first, because there's no point | |
2090 | including more than one in the machine description unless | |
2091 | the more limited one has some advantage. */ | |
2092 | #ifdef HAVE_movstrqi | |
2093 | if (HAVE_movstrqi | |
2094 | && GET_CODE (size) == CONST_INT | |
2095 | && ((unsigned) INTVAL (size) | |
2096 | < (1 << (GET_MODE_BITSIZE (QImode) - 1)))) | |
2097 | { | |
c841050e RS |
2098 | rtx pat = gen_movstrqi (gen_rtx (MEM, BLKmode, temp), |
2099 | xinner, size, GEN_INT (align)); | |
2100 | if (pat != 0) | |
2101 | { | |
2102 | emit_insn (pat); | |
2103 | goto ret; | |
2104 | } | |
bbf6f052 RK |
2105 | } |
2106 | #endif | |
2107 | #ifdef HAVE_movstrhi | |
2108 | if (HAVE_movstrhi | |
2109 | && GET_CODE (size) == CONST_INT | |
2110 | && ((unsigned) INTVAL (size) | |
2111 | < (1 << (GET_MODE_BITSIZE (HImode) - 1)))) | |
2112 | { | |
c841050e RS |
2113 | rtx pat = gen_movstrhi (gen_rtx (MEM, BLKmode, temp), |
2114 | xinner, size, GEN_INT (align)); | |
2115 | if (pat != 0) | |
2116 | { | |
2117 | emit_insn (pat); | |
2118 | goto ret; | |
2119 | } | |
bbf6f052 RK |
2120 | } |
2121 | #endif | |
2122 | #ifdef HAVE_movstrsi | |
2123 | if (HAVE_movstrsi) | |
2124 | { | |
c841050e RS |
2125 | rtx pat = gen_movstrsi (gen_rtx (MEM, BLKmode, temp), |
2126 | xinner, size, GEN_INT (align)); | |
2127 | if (pat != 0) | |
2128 | { | |
2129 | emit_insn (pat); | |
2130 | goto ret; | |
2131 | } | |
bbf6f052 RK |
2132 | } |
2133 | #endif | |
2134 | #ifdef HAVE_movstrdi | |
2135 | if (HAVE_movstrdi) | |
2136 | { | |
c841050e RS |
2137 | rtx pat = gen_movstrdi (gen_rtx (MEM, BLKmode, temp), |
2138 | xinner, size, GEN_INT (align)); | |
2139 | if (pat != 0) | |
2140 | { | |
2141 | emit_insn (pat); | |
2142 | goto ret; | |
2143 | } | |
bbf6f052 RK |
2144 | } |
2145 | #endif | |
2146 | ||
2147 | #ifndef ACCUMULATE_OUTGOING_ARGS | |
2148 | /* If the source is referenced relative to the stack pointer, | |
2149 | copy it to another register to stabilize it. We do not need | |
2150 | to do this if we know that we won't be changing sp. */ | |
2151 | ||
2152 | if (reg_mentioned_p (virtual_stack_dynamic_rtx, temp) | |
2153 | || reg_mentioned_p (virtual_outgoing_args_rtx, temp)) | |
2154 | temp = copy_to_reg (temp); | |
2155 | #endif | |
2156 | ||
2157 | /* Make inhibit_defer_pop nonzero around the library call | |
2158 | to force it to pop the bcopy-arguments right away. */ | |
2159 | NO_DEFER_POP; | |
2160 | #ifdef TARGET_MEM_FUNCTIONS | |
d562e42e | 2161 | emit_library_call (memcpy_libfunc, 0, |
bbf6f052 | 2162 | VOIDmode, 3, temp, Pmode, XEXP (xinner, 0), Pmode, |
0fa83258 RK |
2163 | convert_to_mode (TYPE_MODE (sizetype), |
2164 | size, TREE_UNSIGNED (sizetype)), | |
26ba80fc | 2165 | TYPE_MODE (sizetype)); |
bbf6f052 | 2166 | #else |
d562e42e | 2167 | emit_library_call (bcopy_libfunc, 0, |
bbf6f052 | 2168 | VOIDmode, 3, XEXP (xinner, 0), Pmode, temp, Pmode, |
0fa83258 RK |
2169 | convert_to_mode (TYPE_MODE (sizetype), |
2170 | size, TREE_UNSIGNED (sizetype)), | |
26ba80fc | 2171 | TYPE_MODE (sizetype)); |
bbf6f052 RK |
2172 | #endif |
2173 | OK_DEFER_POP; | |
2174 | } | |
2175 | } | |
2176 | else if (partial > 0) | |
2177 | { | |
2178 | /* Scalar partly in registers. */ | |
2179 | ||
2180 | int size = GET_MODE_SIZE (mode) / UNITS_PER_WORD; | |
2181 | int i; | |
2182 | int not_stack; | |
2183 | /* # words of start of argument | |
2184 | that we must make space for but need not store. */ | |
2185 | int offset = partial % (PARM_BOUNDARY / BITS_PER_WORD); | |
2186 | int args_offset = INTVAL (args_so_far); | |
2187 | int skip; | |
2188 | ||
2189 | /* Push padding now if padding above and stack grows down, | |
2190 | or if padding below and stack grows up. | |
2191 | But if space already allocated, this has already been done. */ | |
2192 | if (extra && args_addr == 0 | |
2193 | && where_pad != none && where_pad != stack_direction) | |
906c4e36 | 2194 | anti_adjust_stack (GEN_INT (extra)); |
bbf6f052 RK |
2195 | |
2196 | /* If we make space by pushing it, we might as well push | |
2197 | the real data. Otherwise, we can leave OFFSET nonzero | |
2198 | and leave the space uninitialized. */ | |
2199 | if (args_addr == 0) | |
2200 | offset = 0; | |
2201 | ||
2202 | /* Now NOT_STACK gets the number of words that we don't need to | |
2203 | allocate on the stack. */ | |
2204 | not_stack = partial - offset; | |
2205 | ||
2206 | /* If the partial register-part of the arg counts in its stack size, | |
2207 | skip the part of stack space corresponding to the registers. | |
2208 | Otherwise, start copying to the beginning of the stack space, | |
2209 | by setting SKIP to 0. */ | |
2210 | #ifndef REG_PARM_STACK_SPACE | |
2211 | skip = 0; | |
2212 | #else | |
2213 | skip = not_stack; | |
2214 | #endif | |
2215 | ||
2216 | if (CONSTANT_P (x) && ! LEGITIMATE_CONSTANT_P (x)) | |
2217 | x = validize_mem (force_const_mem (mode, x)); | |
2218 | ||
2219 | /* If X is a hard register in a non-integer mode, copy it into a pseudo; | |
2220 | SUBREGs of such registers are not allowed. */ | |
2221 | if ((GET_CODE (x) == REG && REGNO (x) < FIRST_PSEUDO_REGISTER | |
2222 | && GET_MODE_CLASS (GET_MODE (x)) != MODE_INT)) | |
2223 | x = copy_to_reg (x); | |
2224 | ||
2225 | /* Loop over all the words allocated on the stack for this arg. */ | |
2226 | /* We can do it by words, because any scalar bigger than a word | |
2227 | has a size a multiple of a word. */ | |
2228 | #ifndef PUSH_ARGS_REVERSED | |
2229 | for (i = not_stack; i < size; i++) | |
2230 | #else | |
2231 | for (i = size - 1; i >= not_stack; i--) | |
2232 | #endif | |
2233 | if (i >= not_stack + offset) | |
2234 | emit_push_insn (operand_subword_force (x, i, mode), | |
906c4e36 RK |
2235 | word_mode, NULL_TREE, NULL_RTX, align, 0, NULL_RTX, |
2236 | 0, args_addr, | |
2237 | GEN_INT (args_offset + ((i - not_stack + skip) | |
bbf6f052 RK |
2238 | * UNITS_PER_WORD))); |
2239 | } | |
2240 | else | |
2241 | { | |
2242 | rtx addr; | |
2243 | ||
2244 | /* Push padding now if padding above and stack grows down, | |
2245 | or if padding below and stack grows up. | |
2246 | But if space already allocated, this has already been done. */ | |
2247 | if (extra && args_addr == 0 | |
2248 | && where_pad != none && where_pad != stack_direction) | |
906c4e36 | 2249 | anti_adjust_stack (GEN_INT (extra)); |
bbf6f052 RK |
2250 | |
2251 | #ifdef PUSH_ROUNDING | |
2252 | if (args_addr == 0) | |
2253 | addr = gen_push_operand (); | |
2254 | else | |
2255 | #endif | |
2256 | if (GET_CODE (args_so_far) == CONST_INT) | |
2257 | addr | |
2258 | = memory_address (mode, | |
2259 | plus_constant (args_addr, INTVAL (args_so_far))); | |
2260 | else | |
2261 | addr = memory_address (mode, gen_rtx (PLUS, Pmode, args_addr, | |
2262 | args_so_far)); | |
2263 | ||
2264 | emit_move_insn (gen_rtx (MEM, mode, addr), x); | |
2265 | } | |
2266 | ||
2267 | ret: | |
2268 | /* If part should go in registers, copy that part | |
2269 | into the appropriate registers. Do this now, at the end, | |
2270 | since mem-to-mem copies above may do function calls. */ | |
cd048831 | 2271 | if (partial > 0 && reg != 0) |
bbf6f052 RK |
2272 | move_block_to_reg (REGNO (reg), x, partial, mode); |
2273 | ||
2274 | if (extra && args_addr == 0 && where_pad == stack_direction) | |
906c4e36 | 2275 | anti_adjust_stack (GEN_INT (extra)); |
bbf6f052 RK |
2276 | } |
2277 | \f | |
bbf6f052 RK |
2278 | /* Expand an assignment that stores the value of FROM into TO. |
2279 | If WANT_VALUE is nonzero, return an rtx for the value of TO. | |
709f5be1 RS |
2280 | (This may contain a QUEUED rtx; |
2281 | if the value is constant, this rtx is a constant.) | |
2282 | Otherwise, the returned value is NULL_RTX. | |
bbf6f052 RK |
2283 | |
2284 | SUGGEST_REG is no longer actually used. | |
2285 | It used to mean, copy the value through a register | |
2286 | and return that register, if that is possible. | |
709f5be1 | 2287 | We now use WANT_VALUE to decide whether to do this. */ |
bbf6f052 RK |
2288 | |
2289 | rtx | |
2290 | expand_assignment (to, from, want_value, suggest_reg) | |
2291 | tree to, from; | |
2292 | int want_value; | |
2293 | int suggest_reg; | |
2294 | { | |
2295 | register rtx to_rtx = 0; | |
2296 | rtx result; | |
2297 | ||
2298 | /* Don't crash if the lhs of the assignment was erroneous. */ | |
2299 | ||
2300 | if (TREE_CODE (to) == ERROR_MARK) | |
709f5be1 RS |
2301 | { |
2302 | result = expand_expr (from, NULL_RTX, VOIDmode, 0); | |
2303 | return want_value ? result : NULL_RTX; | |
2304 | } | |
bbf6f052 | 2305 | |
ca695ac9 JB |
2306 | if (output_bytecode) |
2307 | { | |
2308 | tree dest_innermost; | |
2309 | ||
2310 | bc_expand_expr (from); | |
6d6e61ce | 2311 | bc_emit_instruction (duplicate); |
ca695ac9 JB |
2312 | |
2313 | dest_innermost = bc_expand_address (to); | |
2314 | ||
2315 | /* Can't deduce from TYPE that we're dealing with a bitfield, so | |
2316 | take care of it here. */ | |
2317 | ||
2318 | bc_store_memory (TREE_TYPE (to), dest_innermost); | |
2319 | return NULL; | |
2320 | } | |
2321 | ||
bbf6f052 RK |
2322 | /* Assignment of a structure component needs special treatment |
2323 | if the structure component's rtx is not simply a MEM. | |
2324 | Assignment of an array element at a constant index | |
2325 | has the same problem. */ | |
2326 | ||
2327 | if (TREE_CODE (to) == COMPONENT_REF | |
2328 | || TREE_CODE (to) == BIT_FIELD_REF | |
2329 | || (TREE_CODE (to) == ARRAY_REF | |
2330 | && TREE_CODE (TREE_OPERAND (to, 1)) == INTEGER_CST | |
2331 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (to))) == INTEGER_CST)) | |
2332 | { | |
2333 | enum machine_mode mode1; | |
2334 | int bitsize; | |
2335 | int bitpos; | |
7bb0943f | 2336 | tree offset; |
bbf6f052 RK |
2337 | int unsignedp; |
2338 | int volatilep = 0; | |
0088fcb1 | 2339 | tree tem; |
d78d243c | 2340 | int alignment; |
0088fcb1 RK |
2341 | |
2342 | push_temp_slots (); | |
2343 | tem = get_inner_reference (to, &bitsize, &bitpos, &offset, | |
bbf6f052 RK |
2344 | &mode1, &unsignedp, &volatilep); |
2345 | ||
2346 | /* If we are going to use store_bit_field and extract_bit_field, | |
2347 | make sure to_rtx will be safe for multiple use. */ | |
2348 | ||
2349 | if (mode1 == VOIDmode && want_value) | |
2350 | tem = stabilize_reference (tem); | |
2351 | ||
d78d243c | 2352 | alignment = TYPE_ALIGN (TREE_TYPE (tem)) / BITS_PER_UNIT; |
906c4e36 | 2353 | to_rtx = expand_expr (tem, NULL_RTX, VOIDmode, 0); |
7bb0943f RS |
2354 | if (offset != 0) |
2355 | { | |
906c4e36 | 2356 | rtx offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, 0); |
7bb0943f RS |
2357 | |
2358 | if (GET_CODE (to_rtx) != MEM) | |
2359 | abort (); | |
2360 | to_rtx = change_address (to_rtx, VOIDmode, | |
2361 | gen_rtx (PLUS, Pmode, XEXP (to_rtx, 0), | |
2362 | force_reg (Pmode, offset_rtx))); | |
d78d243c RS |
2363 | /* If we have a variable offset, the known alignment |
2364 | is only that of the innermost structure containing the field. | |
2365 | (Actually, we could sometimes do better by using the | |
2366 | align of an element of the innermost array, but no need.) */ | |
2367 | if (TREE_CODE (to) == COMPONENT_REF | |
2368 | || TREE_CODE (to) == BIT_FIELD_REF) | |
2369 | alignment | |
2370 | = TYPE_ALIGN (TREE_TYPE (TREE_OPERAND (to, 0))) / BITS_PER_UNIT; | |
7bb0943f | 2371 | } |
bbf6f052 RK |
2372 | if (volatilep) |
2373 | { | |
2374 | if (GET_CODE (to_rtx) == MEM) | |
2375 | MEM_VOLATILE_P (to_rtx) = 1; | |
2376 | #if 0 /* This was turned off because, when a field is volatile | |
2377 | in an object which is not volatile, the object may be in a register, | |
2378 | and then we would abort over here. */ | |
2379 | else | |
2380 | abort (); | |
2381 | #endif | |
2382 | } | |
2383 | ||
2384 | result = store_field (to_rtx, bitsize, bitpos, mode1, from, | |
2385 | (want_value | |
2386 | /* Spurious cast makes HPUX compiler happy. */ | |
2387 | ? (enum machine_mode) TYPE_MODE (TREE_TYPE (to)) | |
2388 | : VOIDmode), | |
2389 | unsignedp, | |
2390 | /* Required alignment of containing datum. */ | |
d78d243c | 2391 | alignment, |
bbf6f052 RK |
2392 | int_size_in_bytes (TREE_TYPE (tem))); |
2393 | preserve_temp_slots (result); | |
2394 | free_temp_slots (); | |
0088fcb1 | 2395 | pop_temp_slots (); |
bbf6f052 | 2396 | |
709f5be1 RS |
2397 | /* If the value is meaningful, convert RESULT to the proper mode. |
2398 | Otherwise, return nothing. */ | |
5ffe63ed RS |
2399 | return (want_value ? convert_modes (TYPE_MODE (TREE_TYPE (to)), |
2400 | TYPE_MODE (TREE_TYPE (from)), | |
2401 | result, | |
2402 | TREE_UNSIGNED (TREE_TYPE (to))) | |
709f5be1 | 2403 | : NULL_RTX); |
bbf6f052 RK |
2404 | } |
2405 | ||
cd1db108 RS |
2406 | /* If the rhs is a function call and its value is not an aggregate, |
2407 | call the function before we start to compute the lhs. | |
2408 | This is needed for correct code for cases such as | |
2409 | val = setjmp (buf) on machines where reference to val | |
1ad87b63 RK |
2410 | requires loading up part of an address in a separate insn. |
2411 | ||
2412 | Don't do this if TO is a VAR_DECL whose DECL_RTL is REG since it might be | |
2413 | a promoted variable where the zero- or sign- extension needs to be done. | |
2414 | Handling this in the normal way is safe because no computation is done | |
2415 | before the call. */ | |
2416 | if (TREE_CODE (from) == CALL_EXPR && ! aggregate_value_p (from) | |
2417 | && ! (TREE_CODE (to) == VAR_DECL && GET_CODE (DECL_RTL (to)) == REG)) | |
cd1db108 | 2418 | { |
0088fcb1 RK |
2419 | rtx value; |
2420 | ||
2421 | push_temp_slots (); | |
2422 | value = expand_expr (from, NULL_RTX, VOIDmode, 0); | |
cd1db108 RS |
2423 | if (to_rtx == 0) |
2424 | to_rtx = expand_expr (to, NULL_RTX, VOIDmode, 0); | |
2425 | emit_move_insn (to_rtx, value); | |
2426 | preserve_temp_slots (to_rtx); | |
2427 | free_temp_slots (); | |
0088fcb1 | 2428 | pop_temp_slots (); |
709f5be1 | 2429 | return want_value ? to_rtx : NULL_RTX; |
cd1db108 RS |
2430 | } |
2431 | ||
bbf6f052 RK |
2432 | /* Ordinary treatment. Expand TO to get a REG or MEM rtx. |
2433 | Don't re-expand if it was expanded already (in COMPONENT_REF case). */ | |
2434 | ||
2435 | if (to_rtx == 0) | |
906c4e36 | 2436 | to_rtx = expand_expr (to, NULL_RTX, VOIDmode, 0); |
bbf6f052 | 2437 | |
86d38d25 RS |
2438 | /* Don't move directly into a return register. */ |
2439 | if (TREE_CODE (to) == RESULT_DECL && GET_CODE (to_rtx) == REG) | |
2440 | { | |
0088fcb1 RK |
2441 | rtx temp; |
2442 | ||
2443 | push_temp_slots (); | |
2444 | temp = expand_expr (from, 0, GET_MODE (to_rtx), 0); | |
86d38d25 RS |
2445 | emit_move_insn (to_rtx, temp); |
2446 | preserve_temp_slots (to_rtx); | |
2447 | free_temp_slots (); | |
0088fcb1 | 2448 | pop_temp_slots (); |
709f5be1 | 2449 | return want_value ? to_rtx : NULL_RTX; |
86d38d25 RS |
2450 | } |
2451 | ||
bbf6f052 RK |
2452 | /* In case we are returning the contents of an object which overlaps |
2453 | the place the value is being stored, use a safe function when copying | |
2454 | a value through a pointer into a structure value return block. */ | |
2455 | if (TREE_CODE (to) == RESULT_DECL && TREE_CODE (from) == INDIRECT_REF | |
2456 | && current_function_returns_struct | |
2457 | && !current_function_returns_pcc_struct) | |
2458 | { | |
0088fcb1 RK |
2459 | rtx from_rtx, size; |
2460 | ||
2461 | push_temp_slots (); | |
33a20d10 RK |
2462 | size = expr_size (from); |
2463 | from_rtx = expand_expr (from, NULL_RTX, VOIDmode, 0); | |
bbf6f052 RK |
2464 | |
2465 | #ifdef TARGET_MEM_FUNCTIONS | |
d562e42e | 2466 | emit_library_call (memcpy_libfunc, 0, |
bbf6f052 RK |
2467 | VOIDmode, 3, XEXP (to_rtx, 0), Pmode, |
2468 | XEXP (from_rtx, 0), Pmode, | |
0fa83258 RK |
2469 | convert_to_mode (TYPE_MODE (sizetype), |
2470 | size, TREE_UNSIGNED (sizetype)), | |
26ba80fc | 2471 | TYPE_MODE (sizetype)); |
bbf6f052 | 2472 | #else |
d562e42e | 2473 | emit_library_call (bcopy_libfunc, 0, |
bbf6f052 RK |
2474 | VOIDmode, 3, XEXP (from_rtx, 0), Pmode, |
2475 | XEXP (to_rtx, 0), Pmode, | |
0fa83258 RK |
2476 | convert_to_mode (TYPE_MODE (sizetype), |
2477 | size, TREE_UNSIGNED (sizetype)), | |
26ba80fc | 2478 | TYPE_MODE (sizetype)); |
bbf6f052 RK |
2479 | #endif |
2480 | ||
2481 | preserve_temp_slots (to_rtx); | |
2482 | free_temp_slots (); | |
0088fcb1 | 2483 | pop_temp_slots (); |
709f5be1 | 2484 | return want_value ? to_rtx : NULL_RTX; |
bbf6f052 RK |
2485 | } |
2486 | ||
2487 | /* Compute FROM and store the value in the rtx we got. */ | |
2488 | ||
0088fcb1 | 2489 | push_temp_slots (); |
bbf6f052 RK |
2490 | result = store_expr (from, to_rtx, want_value); |
2491 | preserve_temp_slots (result); | |
2492 | free_temp_slots (); | |
0088fcb1 | 2493 | pop_temp_slots (); |
709f5be1 | 2494 | return want_value ? result : NULL_RTX; |
bbf6f052 RK |
2495 | } |
2496 | ||
2497 | /* Generate code for computing expression EXP, | |
2498 | and storing the value into TARGET. | |
bbf6f052 RK |
2499 | TARGET may contain a QUEUED rtx. |
2500 | ||
709f5be1 RS |
2501 | If WANT_VALUE is nonzero, return a copy of the value |
2502 | not in TARGET, so that we can be sure to use the proper | |
2503 | value in a containing expression even if TARGET has something | |
2504 | else stored in it. If possible, we copy the value through a pseudo | |
2505 | and return that pseudo. Or, if the value is constant, we try to | |
2506 | return the constant. In some cases, we return a pseudo | |
2507 | copied *from* TARGET. | |
2508 | ||
2509 | If the mode is BLKmode then we may return TARGET itself. | |
2510 | It turns out that in BLKmode it doesn't cause a problem. | |
2511 | because C has no operators that could combine two different | |
2512 | assignments into the same BLKmode object with different values | |
2513 | with no sequence point. Will other languages need this to | |
2514 | be more thorough? | |
2515 | ||
2516 | If WANT_VALUE is 0, we return NULL, to make sure | |
2517 | to catch quickly any cases where the caller uses the value | |
2518 | and fails to set WANT_VALUE. */ | |
bbf6f052 RK |
2519 | |
2520 | rtx | |
709f5be1 | 2521 | store_expr (exp, target, want_value) |
bbf6f052 RK |
2522 | register tree exp; |
2523 | register rtx target; | |
709f5be1 | 2524 | int want_value; |
bbf6f052 RK |
2525 | { |
2526 | register rtx temp; | |
2527 | int dont_return_target = 0; | |
2528 | ||
2529 | if (TREE_CODE (exp) == COMPOUND_EXPR) | |
2530 | { | |
2531 | /* Perform first part of compound expression, then assign from second | |
2532 | part. */ | |
2533 | expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0); | |
2534 | emit_queue (); | |
709f5be1 | 2535 | return store_expr (TREE_OPERAND (exp, 1), target, want_value); |
bbf6f052 RK |
2536 | } |
2537 | else if (TREE_CODE (exp) == COND_EXPR && GET_MODE (target) == BLKmode) | |
2538 | { | |
2539 | /* For conditional expression, get safe form of the target. Then | |
2540 | test the condition, doing the appropriate assignment on either | |
2541 | side. This avoids the creation of unnecessary temporaries. | |
2542 | For non-BLKmode, it is more efficient not to do this. */ | |
2543 | ||
2544 | rtx lab1 = gen_label_rtx (), lab2 = gen_label_rtx (); | |
2545 | ||
2546 | emit_queue (); | |
2547 | target = protect_from_queue (target, 1); | |
2548 | ||
2549 | NO_DEFER_POP; | |
2550 | jumpifnot (TREE_OPERAND (exp, 0), lab1); | |
709f5be1 | 2551 | store_expr (TREE_OPERAND (exp, 1), target, 0); |
bbf6f052 RK |
2552 | emit_queue (); |
2553 | emit_jump_insn (gen_jump (lab2)); | |
2554 | emit_barrier (); | |
2555 | emit_label (lab1); | |
709f5be1 | 2556 | store_expr (TREE_OPERAND (exp, 2), target, 0); |
bbf6f052 RK |
2557 | emit_queue (); |
2558 | emit_label (lab2); | |
2559 | OK_DEFER_POP; | |
709f5be1 | 2560 | return want_value ? target : NULL_RTX; |
bbf6f052 | 2561 | } |
709f5be1 | 2562 | else if (want_value && GET_CODE (target) == MEM && ! MEM_VOLATILE_P (target) |
bbf6f052 RK |
2563 | && GET_MODE (target) != BLKmode) |
2564 | /* If target is in memory and caller wants value in a register instead, | |
2565 | arrange that. Pass TARGET as target for expand_expr so that, | |
709f5be1 | 2566 | if EXP is another assignment, WANT_VALUE will be nonzero for it. |
c2e6aff6 RS |
2567 | We know expand_expr will not use the target in that case. |
2568 | Don't do this if TARGET is volatile because we are supposed | |
2569 | to write it and then read it. */ | |
bbf6f052 | 2570 | { |
906c4e36 | 2571 | temp = expand_expr (exp, cse_not_expected ? NULL_RTX : target, |
bbf6f052 RK |
2572 | GET_MODE (target), 0); |
2573 | if (GET_MODE (temp) != BLKmode && GET_MODE (temp) != VOIDmode) | |
2574 | temp = copy_to_reg (temp); | |
2575 | dont_return_target = 1; | |
2576 | } | |
2577 | else if (queued_subexp_p (target)) | |
709f5be1 RS |
2578 | /* If target contains a postincrement, let's not risk |
2579 | using it as the place to generate the rhs. */ | |
bbf6f052 RK |
2580 | { |
2581 | if (GET_MODE (target) != BLKmode && GET_MODE (target) != VOIDmode) | |
2582 | { | |
2583 | /* Expand EXP into a new pseudo. */ | |
2584 | temp = gen_reg_rtx (GET_MODE (target)); | |
2585 | temp = expand_expr (exp, temp, GET_MODE (target), 0); | |
2586 | } | |
2587 | else | |
906c4e36 | 2588 | temp = expand_expr (exp, NULL_RTX, GET_MODE (target), 0); |
709f5be1 RS |
2589 | |
2590 | /* If target is volatile, ANSI requires accessing the value | |
2591 | *from* the target, if it is accessed. So make that happen. | |
2592 | In no case return the target itself. */ | |
2593 | if (! MEM_VOLATILE_P (target) && want_value) | |
2594 | dont_return_target = 1; | |
bbf6f052 | 2595 | } |
1499e0a8 RK |
2596 | else if (GET_CODE (target) == SUBREG && SUBREG_PROMOTED_VAR_P (target)) |
2597 | /* If this is an scalar in a register that is stored in a wider mode | |
2598 | than the declared mode, compute the result into its declared mode | |
2599 | and then convert to the wider mode. Our value is the computed | |
2600 | expression. */ | |
2601 | { | |
2602 | temp = expand_expr (exp, NULL_RTX, VOIDmode, 0); | |
b258707c | 2603 | |
766f36c7 RK |
2604 | /* If TEMP is a volatile MEM and we want a result value, make |
2605 | the access now so it gets done only once. */ | |
2606 | if (GET_CODE (temp) == MEM && MEM_VOLATILE_P (temp)) | |
2607 | temp = copy_to_reg (temp); | |
2608 | ||
b258707c RS |
2609 | /* If TEMP is a VOIDmode constant, use convert_modes to make |
2610 | sure that we properly convert it. */ | |
2611 | if (CONSTANT_P (temp) && GET_MODE (temp) == VOIDmode) | |
2612 | temp = convert_modes (GET_MODE (SUBREG_REG (target)), | |
2613 | TYPE_MODE (TREE_TYPE (exp)), temp, | |
2614 | SUBREG_PROMOTED_UNSIGNED_P (target)); | |
2615 | ||
1499e0a8 RK |
2616 | convert_move (SUBREG_REG (target), temp, |
2617 | SUBREG_PROMOTED_UNSIGNED_P (target)); | |
709f5be1 | 2618 | return want_value ? temp : NULL_RTX; |
1499e0a8 | 2619 | } |
bbf6f052 RK |
2620 | else |
2621 | { | |
2622 | temp = expand_expr (exp, target, GET_MODE (target), 0); | |
766f36c7 | 2623 | /* Return TARGET if it's a specified hardware register. |
709f5be1 RS |
2624 | If TARGET is a volatile mem ref, either return TARGET |
2625 | or return a reg copied *from* TARGET; ANSI requires this. | |
2626 | ||
2627 | Otherwise, if TEMP is not TARGET, return TEMP | |
2628 | if it is constant (for efficiency), | |
2629 | or if we really want the correct value. */ | |
bbf6f052 RK |
2630 | if (!(target && GET_CODE (target) == REG |
2631 | && REGNO (target) < FIRST_PSEUDO_REGISTER) | |
709f5be1 RS |
2632 | && !(GET_CODE (target) == MEM && MEM_VOLATILE_P (target)) |
2633 | && temp != target | |
2634 | && (CONSTANT_P (temp) || want_value)) | |
bbf6f052 RK |
2635 | dont_return_target = 1; |
2636 | } | |
2637 | ||
b258707c RS |
2638 | /* If TEMP is a VOIDmode constant and the mode of the type of EXP is not |
2639 | the same as that of TARGET, adjust the constant. This is needed, for | |
2640 | example, in case it is a CONST_DOUBLE and we want only a word-sized | |
2641 | value. */ | |
2642 | if (CONSTANT_P (temp) && GET_MODE (temp) == VOIDmode | |
2643 | && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp))) | |
2644 | temp = convert_modes (GET_MODE (target), TYPE_MODE (TREE_TYPE (exp)), | |
2645 | temp, TREE_UNSIGNED (TREE_TYPE (exp))); | |
2646 | ||
bbf6f052 RK |
2647 | /* If value was not generated in the target, store it there. |
2648 | Convert the value to TARGET's type first if nec. */ | |
2649 | ||
2650 | if (temp != target && TREE_CODE (exp) != ERROR_MARK) | |
2651 | { | |
2652 | target = protect_from_queue (target, 1); | |
2653 | if (GET_MODE (temp) != GET_MODE (target) | |
2654 | && GET_MODE (temp) != VOIDmode) | |
2655 | { | |
2656 | int unsignedp = TREE_UNSIGNED (TREE_TYPE (exp)); | |
2657 | if (dont_return_target) | |
2658 | { | |
2659 | /* In this case, we will return TEMP, | |
2660 | so make sure it has the proper mode. | |
2661 | But don't forget to store the value into TARGET. */ | |
2662 | temp = convert_to_mode (GET_MODE (target), temp, unsignedp); | |
2663 | emit_move_insn (target, temp); | |
2664 | } | |
2665 | else | |
2666 | convert_move (target, temp, unsignedp); | |
2667 | } | |
2668 | ||
2669 | else if (GET_MODE (temp) == BLKmode && TREE_CODE (exp) == STRING_CST) | |
2670 | { | |
2671 | /* Handle copying a string constant into an array. | |
2672 | The string constant may be shorter than the array. | |
2673 | So copy just the string's actual length, and clear the rest. */ | |
2674 | rtx size; | |
2675 | ||
e87b4f3f RS |
2676 | /* Get the size of the data type of the string, |
2677 | which is actually the size of the target. */ | |
2678 | size = expr_size (exp); | |
2679 | if (GET_CODE (size) == CONST_INT | |
2680 | && INTVAL (size) < TREE_STRING_LENGTH (exp)) | |
2681 | emit_block_move (target, temp, size, | |
2682 | TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT); | |
2683 | else | |
bbf6f052 | 2684 | { |
e87b4f3f RS |
2685 | /* Compute the size of the data to copy from the string. */ |
2686 | tree copy_size | |
c03b7665 | 2687 | = size_binop (MIN_EXPR, |
b50d17a1 | 2688 | make_tree (sizetype, size), |
c03b7665 RK |
2689 | convert (sizetype, |
2690 | build_int_2 (TREE_STRING_LENGTH (exp), 0))); | |
906c4e36 RK |
2691 | rtx copy_size_rtx = expand_expr (copy_size, NULL_RTX, |
2692 | VOIDmode, 0); | |
e87b4f3f RS |
2693 | rtx label = 0; |
2694 | ||
2695 | /* Copy that much. */ | |
2696 | emit_block_move (target, temp, copy_size_rtx, | |
2697 | TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT); | |
2698 | ||
2699 | /* Figure out how much is left in TARGET | |
2700 | that we have to clear. */ | |
2701 | if (GET_CODE (copy_size_rtx) == CONST_INT) | |
2702 | { | |
2703 | temp = plus_constant (XEXP (target, 0), | |
2704 | TREE_STRING_LENGTH (exp)); | |
2705 | size = plus_constant (size, | |
2706 | - TREE_STRING_LENGTH (exp)); | |
2707 | } | |
2708 | else | |
2709 | { | |
2710 | enum machine_mode size_mode = Pmode; | |
2711 | ||
2712 | temp = force_reg (Pmode, XEXP (target, 0)); | |
2713 | temp = expand_binop (size_mode, add_optab, temp, | |
906c4e36 RK |
2714 | copy_size_rtx, NULL_RTX, 0, |
2715 | OPTAB_LIB_WIDEN); | |
e87b4f3f RS |
2716 | |
2717 | size = expand_binop (size_mode, sub_optab, size, | |
906c4e36 RK |
2718 | copy_size_rtx, NULL_RTX, 0, |
2719 | OPTAB_LIB_WIDEN); | |
e87b4f3f | 2720 | |
906c4e36 | 2721 | emit_cmp_insn (size, const0_rtx, LT, NULL_RTX, |
e87b4f3f RS |
2722 | GET_MODE (size), 0, 0); |
2723 | label = gen_label_rtx (); | |
2724 | emit_jump_insn (gen_blt (label)); | |
2725 | } | |
2726 | ||
2727 | if (size != const0_rtx) | |
2728 | { | |
bbf6f052 | 2729 | #ifdef TARGET_MEM_FUNCTIONS |
d562e42e | 2730 | emit_library_call (memset_libfunc, 0, VOIDmode, 3, |
e87b4f3f | 2731 | temp, Pmode, const0_rtx, Pmode, size, Pmode); |
bbf6f052 | 2732 | #else |
d562e42e | 2733 | emit_library_call (bzero_libfunc, 0, VOIDmode, 2, |
e87b4f3f | 2734 | temp, Pmode, size, Pmode); |
bbf6f052 | 2735 | #endif |
e87b4f3f RS |
2736 | } |
2737 | if (label) | |
2738 | emit_label (label); | |
bbf6f052 RK |
2739 | } |
2740 | } | |
2741 | else if (GET_MODE (temp) == BLKmode) | |
2742 | emit_block_move (target, temp, expr_size (exp), | |
2743 | TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT); | |
2744 | else | |
2745 | emit_move_insn (target, temp); | |
2746 | } | |
709f5be1 | 2747 | |
766f36c7 RK |
2748 | /* If we don't want a value, return NULL_RTX. */ |
2749 | if (! want_value) | |
2750 | return NULL_RTX; | |
2751 | ||
2752 | /* If we are supposed to return TEMP, do so as long as it isn't a MEM. | |
2753 | ??? The latter test doesn't seem to make sense. */ | |
2754 | else if (dont_return_target && GET_CODE (temp) != MEM) | |
bbf6f052 | 2755 | return temp; |
766f36c7 RK |
2756 | |
2757 | /* Return TARGET itself if it is a hard register. */ | |
2758 | else if (want_value && GET_MODE (target) != BLKmode | |
2759 | && ! (GET_CODE (target) == REG | |
2760 | && REGNO (target) < FIRST_PSEUDO_REGISTER)) | |
709f5be1 | 2761 | return copy_to_reg (target); |
766f36c7 RK |
2762 | |
2763 | else | |
709f5be1 | 2764 | return target; |
bbf6f052 RK |
2765 | } |
2766 | \f | |
2767 | /* Store the value of constructor EXP into the rtx TARGET. | |
2768 | TARGET is either a REG or a MEM. */ | |
2769 | ||
2770 | static void | |
2771 | store_constructor (exp, target) | |
2772 | tree exp; | |
2773 | rtx target; | |
2774 | { | |
4af3895e JVA |
2775 | tree type = TREE_TYPE (exp); |
2776 | ||
bbf6f052 RK |
2777 | /* We know our target cannot conflict, since safe_from_p has been called. */ |
2778 | #if 0 | |
2779 | /* Don't try copying piece by piece into a hard register | |
2780 | since that is vulnerable to being clobbered by EXP. | |
2781 | Instead, construct in a pseudo register and then copy it all. */ | |
2782 | if (GET_CODE (target) == REG && REGNO (target) < FIRST_PSEUDO_REGISTER) | |
2783 | { | |
2784 | rtx temp = gen_reg_rtx (GET_MODE (target)); | |
2785 | store_constructor (exp, temp); | |
2786 | emit_move_insn (target, temp); | |
2787 | return; | |
2788 | } | |
2789 | #endif | |
2790 | ||
e44842fe RK |
2791 | if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE |
2792 | || TREE_CODE (type) == QUAL_UNION_TYPE) | |
bbf6f052 RK |
2793 | { |
2794 | register tree elt; | |
2795 | ||
4af3895e | 2796 | /* Inform later passes that the whole union value is dead. */ |
e44842fe RK |
2797 | if (TREE_CODE (type) == UNION_TYPE |
2798 | || TREE_CODE (type) == QUAL_UNION_TYPE) | |
bbf6f052 | 2799 | emit_insn (gen_rtx (CLOBBER, VOIDmode, target)); |
4af3895e JVA |
2800 | |
2801 | /* If we are building a static constructor into a register, | |
2802 | set the initial value as zero so we can fold the value into | |
2803 | a constant. */ | |
2804 | else if (GET_CODE (target) == REG && TREE_STATIC (exp)) | |
2805 | emit_move_insn (target, const0_rtx); | |
2806 | ||
bbf6f052 RK |
2807 | /* If the constructor has fewer fields than the structure, |
2808 | clear the whole structure first. */ | |
2809 | else if (list_length (CONSTRUCTOR_ELTS (exp)) | |
4af3895e JVA |
2810 | != list_length (TYPE_FIELDS (type))) |
2811 | clear_storage (target, int_size_in_bytes (type)); | |
bbf6f052 RK |
2812 | else |
2813 | /* Inform later passes that the old value is dead. */ | |
2814 | emit_insn (gen_rtx (CLOBBER, VOIDmode, target)); | |
2815 | ||
2816 | /* Store each element of the constructor into | |
2817 | the corresponding field of TARGET. */ | |
2818 | ||
2819 | for (elt = CONSTRUCTOR_ELTS (exp); elt; elt = TREE_CHAIN (elt)) | |
2820 | { | |
2821 | register tree field = TREE_PURPOSE (elt); | |
2822 | register enum machine_mode mode; | |
2823 | int bitsize; | |
b50d17a1 | 2824 | int bitpos = 0; |
bbf6f052 | 2825 | int unsignedp; |
b50d17a1 RK |
2826 | tree pos, constant = 0, offset = 0; |
2827 | rtx to_rtx = target; | |
bbf6f052 | 2828 | |
f32fd778 RS |
2829 | /* Just ignore missing fields. |
2830 | We cleared the whole structure, above, | |
2831 | if any fields are missing. */ | |
2832 | if (field == 0) | |
2833 | continue; | |
2834 | ||
bbf6f052 RK |
2835 | bitsize = TREE_INT_CST_LOW (DECL_SIZE (field)); |
2836 | unsignedp = TREE_UNSIGNED (field); | |
2837 | mode = DECL_MODE (field); | |
2838 | if (DECL_BIT_FIELD (field)) | |
2839 | mode = VOIDmode; | |
2840 | ||
b50d17a1 RK |
2841 | pos = DECL_FIELD_BITPOS (field); |
2842 | if (TREE_CODE (pos) == INTEGER_CST) | |
2843 | constant = pos; | |
2844 | else if (TREE_CODE (pos) == PLUS_EXPR | |
2845 | && TREE_CODE (TREE_OPERAND (pos, 1)) == INTEGER_CST) | |
2846 | constant = TREE_OPERAND (pos, 1), offset = TREE_OPERAND (pos, 0); | |
2847 | else | |
2848 | offset = pos; | |
2849 | ||
2850 | if (constant) | |
2851 | bitpos = TREE_INT_CST_LOW (DECL_FIELD_BITPOS (field)); | |
2852 | ||
2853 | if (offset) | |
2854 | { | |
2855 | rtx offset_rtx; | |
2856 | ||
2857 | if (contains_placeholder_p (offset)) | |
2858 | offset = build (WITH_RECORD_EXPR, sizetype, | |
2859 | offset, exp); | |
bbf6f052 | 2860 | |
b50d17a1 RK |
2861 | offset = size_binop (FLOOR_DIV_EXPR, offset, |
2862 | size_int (BITS_PER_UNIT)); | |
bbf6f052 | 2863 | |
b50d17a1 RK |
2864 | offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, 0); |
2865 | if (GET_CODE (to_rtx) != MEM) | |
2866 | abort (); | |
2867 | ||
2868 | to_rtx | |
2869 | = change_address (to_rtx, VOIDmode, | |
2870 | gen_rtx (PLUS, Pmode, XEXP (to_rtx, 0), | |
2871 | force_reg (Pmode, offset_rtx))); | |
2872 | } | |
2873 | ||
2874 | store_field (to_rtx, bitsize, bitpos, mode, TREE_VALUE (elt), | |
bbf6f052 RK |
2875 | /* The alignment of TARGET is |
2876 | at least what its type requires. */ | |
2877 | VOIDmode, 0, | |
4af3895e JVA |
2878 | TYPE_ALIGN (type) / BITS_PER_UNIT, |
2879 | int_size_in_bytes (type)); | |
bbf6f052 RK |
2880 | } |
2881 | } | |
4af3895e | 2882 | else if (TREE_CODE (type) == ARRAY_TYPE) |
bbf6f052 RK |
2883 | { |
2884 | register tree elt; | |
2885 | register int i; | |
4af3895e | 2886 | tree domain = TYPE_DOMAIN (type); |
906c4e36 RK |
2887 | HOST_WIDE_INT minelt = TREE_INT_CST_LOW (TYPE_MIN_VALUE (domain)); |
2888 | HOST_WIDE_INT maxelt = TREE_INT_CST_LOW (TYPE_MAX_VALUE (domain)); | |
4af3895e | 2889 | tree elttype = TREE_TYPE (type); |
bbf6f052 RK |
2890 | |
2891 | /* If the constructor has fewer fields than the structure, | |
4af3895e JVA |
2892 | clear the whole structure first. Similarly if this this is |
2893 | static constructor of a non-BLKmode object. */ | |
bbf6f052 | 2894 | |
4af3895e JVA |
2895 | if (list_length (CONSTRUCTOR_ELTS (exp)) < maxelt - minelt + 1 |
2896 | || (GET_CODE (target) == REG && TREE_STATIC (exp))) | |
597bb7f1 | 2897 | clear_storage (target, int_size_in_bytes (type)); |
bbf6f052 RK |
2898 | else |
2899 | /* Inform later passes that the old value is dead. */ | |
2900 | emit_insn (gen_rtx (CLOBBER, VOIDmode, target)); | |
2901 | ||
2902 | /* Store each element of the constructor into | |
2903 | the corresponding element of TARGET, determined | |
2904 | by counting the elements. */ | |
2905 | for (elt = CONSTRUCTOR_ELTS (exp), i = 0; | |
2906 | elt; | |
2907 | elt = TREE_CHAIN (elt), i++) | |
2908 | { | |
2909 | register enum machine_mode mode; | |
2910 | int bitsize; | |
2911 | int bitpos; | |
2912 | int unsignedp; | |
03dc44a6 RS |
2913 | tree index = TREE_PURPOSE (elt); |
2914 | rtx xtarget = target; | |
bbf6f052 RK |
2915 | |
2916 | mode = TYPE_MODE (elttype); | |
2917 | bitsize = GET_MODE_BITSIZE (mode); | |
2918 | unsignedp = TREE_UNSIGNED (elttype); | |
2919 | ||
03dc44a6 RS |
2920 | if (index != 0 && TREE_CODE (index) != INTEGER_CST) |
2921 | { | |
2922 | /* We don't currently allow variable indices in a | |
2923 | C initializer, but let's try here to support them. */ | |
2924 | rtx pos_rtx, addr, xtarget; | |
2925 | tree position; | |
2926 | ||
2927 | position = size_binop (MULT_EXPR, index, TYPE_SIZE (elttype)); | |
2928 | pos_rtx = expand_expr (position, 0, VOIDmode, 0); | |
2929 | addr = gen_rtx (PLUS, Pmode, XEXP (target, 0), pos_rtx); | |
2930 | xtarget = change_address (target, mode, addr); | |
2931 | store_expr (TREE_VALUE (elt), xtarget, 0); | |
2932 | } | |
2933 | else | |
2934 | { | |
2935 | if (index != 0) | |
7c314719 | 2936 | bitpos = ((TREE_INT_CST_LOW (index) - minelt) |
03dc44a6 RS |
2937 | * TREE_INT_CST_LOW (TYPE_SIZE (elttype))); |
2938 | else | |
2939 | bitpos = (i * TREE_INT_CST_LOW (TYPE_SIZE (elttype))); | |
2940 | ||
2941 | store_field (xtarget, bitsize, bitpos, mode, TREE_VALUE (elt), | |
2942 | /* The alignment of TARGET is | |
2943 | at least what its type requires. */ | |
2944 | VOIDmode, 0, | |
2945 | TYPE_ALIGN (type) / BITS_PER_UNIT, | |
2946 | int_size_in_bytes (type)); | |
2947 | } | |
bbf6f052 RK |
2948 | } |
2949 | } | |
2950 | ||
2951 | else | |
2952 | abort (); | |
2953 | } | |
2954 | ||
2955 | /* Store the value of EXP (an expression tree) | |
2956 | into a subfield of TARGET which has mode MODE and occupies | |
2957 | BITSIZE bits, starting BITPOS bits from the start of TARGET. | |
2958 | If MODE is VOIDmode, it means that we are storing into a bit-field. | |
2959 | ||
2960 | If VALUE_MODE is VOIDmode, return nothing in particular. | |
2961 | UNSIGNEDP is not used in this case. | |
2962 | ||
2963 | Otherwise, return an rtx for the value stored. This rtx | |
2964 | has mode VALUE_MODE if that is convenient to do. | |
2965 | In this case, UNSIGNEDP must be nonzero if the value is an unsigned type. | |
2966 | ||
2967 | ALIGN is the alignment that TARGET is known to have, measured in bytes. | |
2968 | TOTAL_SIZE is the size in bytes of the structure, or -1 if varying. */ | |
2969 | ||
2970 | static rtx | |
2971 | store_field (target, bitsize, bitpos, mode, exp, value_mode, | |
2972 | unsignedp, align, total_size) | |
2973 | rtx target; | |
2974 | int bitsize, bitpos; | |
2975 | enum machine_mode mode; | |
2976 | tree exp; | |
2977 | enum machine_mode value_mode; | |
2978 | int unsignedp; | |
2979 | int align; | |
2980 | int total_size; | |
2981 | { | |
906c4e36 | 2982 | HOST_WIDE_INT width_mask = 0; |
bbf6f052 | 2983 | |
906c4e36 RK |
2984 | if (bitsize < HOST_BITS_PER_WIDE_INT) |
2985 | width_mask = ((HOST_WIDE_INT) 1 << bitsize) - 1; | |
bbf6f052 RK |
2986 | |
2987 | /* If we are storing into an unaligned field of an aligned union that is | |
2988 | in a register, we may have the mode of TARGET being an integer mode but | |
2989 | MODE == BLKmode. In that case, get an aligned object whose size and | |
2990 | alignment are the same as TARGET and store TARGET into it (we can avoid | |
2991 | the store if the field being stored is the entire width of TARGET). Then | |
2992 | call ourselves recursively to store the field into a BLKmode version of | |
2993 | that object. Finally, load from the object into TARGET. This is not | |
2994 | very efficient in general, but should only be slightly more expensive | |
2995 | than the otherwise-required unaligned accesses. Perhaps this can be | |
2996 | cleaned up later. */ | |
2997 | ||
2998 | if (mode == BLKmode | |
2999 | && (GET_CODE (target) == REG || GET_CODE (target) == SUBREG)) | |
3000 | { | |
3001 | rtx object = assign_stack_temp (GET_MODE (target), | |
3002 | GET_MODE_SIZE (GET_MODE (target)), 0); | |
3003 | rtx blk_object = copy_rtx (object); | |
3004 | ||
3005 | PUT_MODE (blk_object, BLKmode); | |
3006 | ||
3007 | if (bitsize != GET_MODE_BITSIZE (GET_MODE (target))) | |
3008 | emit_move_insn (object, target); | |
3009 | ||
3010 | store_field (blk_object, bitsize, bitpos, mode, exp, VOIDmode, 0, | |
3011 | align, total_size); | |
3012 | ||
46093b97 RS |
3013 | /* Even though we aren't returning target, we need to |
3014 | give it the updated value. */ | |
bbf6f052 RK |
3015 | emit_move_insn (target, object); |
3016 | ||
46093b97 | 3017 | return blk_object; |
bbf6f052 RK |
3018 | } |
3019 | ||
3020 | /* If the structure is in a register or if the component | |
3021 | is a bit field, we cannot use addressing to access it. | |
3022 | Use bit-field techniques or SUBREG to store in it. */ | |
3023 | ||
4fa52007 RK |
3024 | if (mode == VOIDmode |
3025 | || (mode != BLKmode && ! direct_store[(int) mode]) | |
3026 | || GET_CODE (target) == REG | |
c980ac49 | 3027 | || GET_CODE (target) == SUBREG |
ccc98036 RS |
3028 | /* If the field isn't aligned enough to store as an ordinary memref, |
3029 | store it as a bit field. */ | |
3030 | || (STRICT_ALIGNMENT | |
3031 | && align * BITS_PER_UNIT < GET_MODE_ALIGNMENT (mode)) | |
3032 | || (STRICT_ALIGNMENT && bitpos % GET_MODE_ALIGNMENT (mode) != 0)) | |
bbf6f052 | 3033 | { |
906c4e36 | 3034 | rtx temp = expand_expr (exp, NULL_RTX, VOIDmode, 0); |
bbd6cf73 RK |
3035 | |
3036 | /* Unless MODE is VOIDmode or BLKmode, convert TEMP to | |
3037 | MODE. */ | |
3038 | if (mode != VOIDmode && mode != BLKmode | |
3039 | && mode != TYPE_MODE (TREE_TYPE (exp))) | |
3040 | temp = convert_modes (mode, TYPE_MODE (TREE_TYPE (exp)), temp, 1); | |
3041 | ||
bbf6f052 RK |
3042 | /* Store the value in the bitfield. */ |
3043 | store_bit_field (target, bitsize, bitpos, mode, temp, align, total_size); | |
3044 | if (value_mode != VOIDmode) | |
3045 | { | |
3046 | /* The caller wants an rtx for the value. */ | |
3047 | /* If possible, avoid refetching from the bitfield itself. */ | |
3048 | if (width_mask != 0 | |
3049 | && ! (GET_CODE (target) == MEM && MEM_VOLATILE_P (target))) | |
5c4d7cfb | 3050 | { |
9074de27 | 3051 | tree count; |
5c4d7cfb | 3052 | enum machine_mode tmode; |
86a2c12a | 3053 | |
5c4d7cfb RS |
3054 | if (unsignedp) |
3055 | return expand_and (temp, GEN_INT (width_mask), NULL_RTX); | |
3056 | tmode = GET_MODE (temp); | |
86a2c12a RS |
3057 | if (tmode == VOIDmode) |
3058 | tmode = value_mode; | |
5c4d7cfb RS |
3059 | count = build_int_2 (GET_MODE_BITSIZE (tmode) - bitsize, 0); |
3060 | temp = expand_shift (LSHIFT_EXPR, tmode, temp, count, 0, 0); | |
3061 | return expand_shift (RSHIFT_EXPR, tmode, temp, count, 0, 0); | |
3062 | } | |
bbf6f052 | 3063 | return extract_bit_field (target, bitsize, bitpos, unsignedp, |
906c4e36 RK |
3064 | NULL_RTX, value_mode, 0, align, |
3065 | total_size); | |
bbf6f052 RK |
3066 | } |
3067 | return const0_rtx; | |
3068 | } | |
3069 | else | |
3070 | { | |
3071 | rtx addr = XEXP (target, 0); | |
3072 | rtx to_rtx; | |
3073 | ||
3074 | /* If a value is wanted, it must be the lhs; | |
3075 | so make the address stable for multiple use. */ | |
3076 | ||
3077 | if (value_mode != VOIDmode && GET_CODE (addr) != REG | |
3078 | && ! CONSTANT_ADDRESS_P (addr) | |
3079 | /* A frame-pointer reference is already stable. */ | |
3080 | && ! (GET_CODE (addr) == PLUS | |
3081 | && GET_CODE (XEXP (addr, 1)) == CONST_INT | |
3082 | && (XEXP (addr, 0) == virtual_incoming_args_rtx | |
3083 | || XEXP (addr, 0) == virtual_stack_vars_rtx))) | |
3084 | addr = copy_to_reg (addr); | |
3085 | ||
3086 | /* Now build a reference to just the desired component. */ | |
3087 | ||
3088 | to_rtx = change_address (target, mode, | |
3089 | plus_constant (addr, (bitpos / BITS_PER_UNIT))); | |
3090 | MEM_IN_STRUCT_P (to_rtx) = 1; | |
3091 | ||
3092 | return store_expr (exp, to_rtx, value_mode != VOIDmode); | |
3093 | } | |
3094 | } | |
3095 | \f | |
3096 | /* Given an expression EXP that may be a COMPONENT_REF, a BIT_FIELD_REF, | |
3097 | or an ARRAY_REF, look for nested COMPONENT_REFs, BIT_FIELD_REFs, or | |
742920c7 | 3098 | ARRAY_REFs and find the ultimate containing object, which we return. |
bbf6f052 RK |
3099 | |
3100 | We set *PBITSIZE to the size in bits that we want, *PBITPOS to the | |
3101 | bit position, and *PUNSIGNEDP to the signedness of the field. | |
7bb0943f RS |
3102 | If the position of the field is variable, we store a tree |
3103 | giving the variable offset (in units) in *POFFSET. | |
3104 | This offset is in addition to the bit position. | |
3105 | If the position is not variable, we store 0 in *POFFSET. | |
bbf6f052 RK |
3106 | |
3107 | If any of the extraction expressions is volatile, | |
3108 | we store 1 in *PVOLATILEP. Otherwise we don't change that. | |
3109 | ||
3110 | If the field is a bit-field, *PMODE is set to VOIDmode. Otherwise, it | |
3111 | is a mode that can be used to access the field. In that case, *PBITSIZE | |
e7c33f54 RK |
3112 | is redundant. |
3113 | ||
3114 | If the field describes a variable-sized object, *PMODE is set to | |
3115 | VOIDmode and *PBITSIZE is set to -1. An access cannot be made in | |
3116 | this case, but the address of the object can be found. */ | |
bbf6f052 RK |
3117 | |
3118 | tree | |
4969d05d RK |
3119 | get_inner_reference (exp, pbitsize, pbitpos, poffset, pmode, |
3120 | punsignedp, pvolatilep) | |
bbf6f052 RK |
3121 | tree exp; |
3122 | int *pbitsize; | |
3123 | int *pbitpos; | |
7bb0943f | 3124 | tree *poffset; |
bbf6f052 RK |
3125 | enum machine_mode *pmode; |
3126 | int *punsignedp; | |
3127 | int *pvolatilep; | |
3128 | { | |
b50d17a1 | 3129 | tree orig_exp = exp; |
bbf6f052 RK |
3130 | tree size_tree = 0; |
3131 | enum machine_mode mode = VOIDmode; | |
742920c7 | 3132 | tree offset = integer_zero_node; |
bbf6f052 RK |
3133 | |
3134 | if (TREE_CODE (exp) == COMPONENT_REF) | |
3135 | { | |
3136 | size_tree = DECL_SIZE (TREE_OPERAND (exp, 1)); | |
3137 | if (! DECL_BIT_FIELD (TREE_OPERAND (exp, 1))) | |
3138 | mode = DECL_MODE (TREE_OPERAND (exp, 1)); | |
3139 | *punsignedp = TREE_UNSIGNED (TREE_OPERAND (exp, 1)); | |
3140 | } | |
3141 | else if (TREE_CODE (exp) == BIT_FIELD_REF) | |
3142 | { | |
3143 | size_tree = TREE_OPERAND (exp, 1); | |
3144 | *punsignedp = TREE_UNSIGNED (exp); | |
3145 | } | |
3146 | else | |
3147 | { | |
3148 | mode = TYPE_MODE (TREE_TYPE (exp)); | |
3149 | *pbitsize = GET_MODE_BITSIZE (mode); | |
3150 | *punsignedp = TREE_UNSIGNED (TREE_TYPE (exp)); | |
3151 | } | |
3152 | ||
3153 | if (size_tree) | |
3154 | { | |
3155 | if (TREE_CODE (size_tree) != INTEGER_CST) | |
e7c33f54 RK |
3156 | mode = BLKmode, *pbitsize = -1; |
3157 | else | |
3158 | *pbitsize = TREE_INT_CST_LOW (size_tree); | |
bbf6f052 RK |
3159 | } |
3160 | ||
3161 | /* Compute cumulative bit-offset for nested component-refs and array-refs, | |
3162 | and find the ultimate containing object. */ | |
3163 | ||
3164 | *pbitpos = 0; | |
3165 | ||
3166 | while (1) | |
3167 | { | |
7bb0943f | 3168 | if (TREE_CODE (exp) == COMPONENT_REF || TREE_CODE (exp) == BIT_FIELD_REF) |
bbf6f052 | 3169 | { |
7bb0943f RS |
3170 | tree pos = (TREE_CODE (exp) == COMPONENT_REF |
3171 | ? DECL_FIELD_BITPOS (TREE_OPERAND (exp, 1)) | |
3172 | : TREE_OPERAND (exp, 2)); | |
bbf6f052 | 3173 | |
e7f3c83f RK |
3174 | /* If this field hasn't been filled in yet, don't go |
3175 | past it. This should only happen when folding expressions | |
3176 | made during type construction. */ | |
3177 | if (pos == 0) | |
3178 | break; | |
3179 | ||
7bb0943f RS |
3180 | if (TREE_CODE (pos) == PLUS_EXPR) |
3181 | { | |
3182 | tree constant, var; | |
3183 | if (TREE_CODE (TREE_OPERAND (pos, 0)) == INTEGER_CST) | |
3184 | { | |
3185 | constant = TREE_OPERAND (pos, 0); | |
3186 | var = TREE_OPERAND (pos, 1); | |
3187 | } | |
3188 | else if (TREE_CODE (TREE_OPERAND (pos, 1)) == INTEGER_CST) | |
3189 | { | |
3190 | constant = TREE_OPERAND (pos, 1); | |
3191 | var = TREE_OPERAND (pos, 0); | |
3192 | } | |
3193 | else | |
3194 | abort (); | |
742920c7 | 3195 | |
7bb0943f | 3196 | *pbitpos += TREE_INT_CST_LOW (constant); |
742920c7 RK |
3197 | offset = size_binop (PLUS_EXPR, offset, |
3198 | size_binop (FLOOR_DIV_EXPR, var, | |
3199 | size_int (BITS_PER_UNIT))); | |
7bb0943f RS |
3200 | } |
3201 | else if (TREE_CODE (pos) == INTEGER_CST) | |
3202 | *pbitpos += TREE_INT_CST_LOW (pos); | |
3203 | else | |
3204 | { | |
3205 | /* Assume here that the offset is a multiple of a unit. | |
3206 | If not, there should be an explicitly added constant. */ | |
742920c7 RK |
3207 | offset = size_binop (PLUS_EXPR, offset, |
3208 | size_binop (FLOOR_DIV_EXPR, pos, | |
3209 | size_int (BITS_PER_UNIT))); | |
7bb0943f | 3210 | } |
bbf6f052 | 3211 | } |
bbf6f052 | 3212 | |
742920c7 | 3213 | else if (TREE_CODE (exp) == ARRAY_REF) |
bbf6f052 | 3214 | { |
742920c7 RK |
3215 | /* This code is based on the code in case ARRAY_REF in expand_expr |
3216 | below. We assume here that the size of an array element is | |
3217 | always an integral multiple of BITS_PER_UNIT. */ | |
3218 | ||
3219 | tree index = TREE_OPERAND (exp, 1); | |
3220 | tree domain = TYPE_DOMAIN (TREE_TYPE (TREE_OPERAND (exp, 0))); | |
3221 | tree low_bound | |
3222 | = domain ? TYPE_MIN_VALUE (domain) : integer_zero_node; | |
3223 | tree index_type = TREE_TYPE (index); | |
3224 | ||
3225 | if (! integer_zerop (low_bound)) | |
3226 | index = fold (build (MINUS_EXPR, index_type, index, low_bound)); | |
3227 | ||
3228 | if (TYPE_PRECISION (index_type) != POINTER_SIZE) | |
3229 | { | |
3230 | index = convert (type_for_size (POINTER_SIZE, 0), index); | |
3231 | index_type = TREE_TYPE (index); | |
3232 | } | |
3233 | ||
3234 | index = fold (build (MULT_EXPR, index_type, index, | |
3235 | TYPE_SIZE (TREE_TYPE (exp)))); | |
3236 | ||
3237 | if (TREE_CODE (index) == INTEGER_CST | |
3238 | && TREE_INT_CST_HIGH (index) == 0) | |
3239 | *pbitpos += TREE_INT_CST_LOW (index); | |
3240 | else | |
3241 | offset = size_binop (PLUS_EXPR, offset, | |
3242 | size_binop (FLOOR_DIV_EXPR, index, | |
3243 | size_int (BITS_PER_UNIT))); | |
bbf6f052 RK |
3244 | } |
3245 | else if (TREE_CODE (exp) != NON_LVALUE_EXPR | |
3246 | && ! ((TREE_CODE (exp) == NOP_EXPR | |
3247 | || TREE_CODE (exp) == CONVERT_EXPR) | |
3248 | && (TYPE_MODE (TREE_TYPE (exp)) | |
3249 | == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))))) | |
3250 | break; | |
7bb0943f RS |
3251 | |
3252 | /* If any reference in the chain is volatile, the effect is volatile. */ | |
3253 | if (TREE_THIS_VOLATILE (exp)) | |
3254 | *pvolatilep = 1; | |
bbf6f052 RK |
3255 | exp = TREE_OPERAND (exp, 0); |
3256 | } | |
3257 | ||
3258 | /* If this was a bit-field, see if there is a mode that allows direct | |
3259 | access in case EXP is in memory. */ | |
e7f3c83f | 3260 | if (mode == VOIDmode && *pbitsize != 0 && *pbitpos % *pbitsize == 0) |
bbf6f052 RK |
3261 | { |
3262 | mode = mode_for_size (*pbitsize, MODE_INT, 0); | |
3263 | if (mode == BLKmode) | |
3264 | mode = VOIDmode; | |
3265 | } | |
3266 | ||
742920c7 RK |
3267 | if (integer_zerop (offset)) |
3268 | offset = 0; | |
3269 | ||
b50d17a1 RK |
3270 | if (offset != 0 && contains_placeholder_p (offset)) |
3271 | offset = build (WITH_RECORD_EXPR, sizetype, offset, orig_exp); | |
3272 | ||
bbf6f052 | 3273 | *pmode = mode; |
7bb0943f | 3274 | *poffset = offset; |
bbf6f052 RK |
3275 | return exp; |
3276 | } | |
3277 | \f | |
3278 | /* Given an rtx VALUE that may contain additions and multiplications, | |
3279 | return an equivalent value that just refers to a register or memory. | |
3280 | This is done by generating instructions to perform the arithmetic | |
c45a13a6 RK |
3281 | and returning a pseudo-register containing the value. |
3282 | ||
3283 | The returned value may be a REG, SUBREG, MEM or constant. */ | |
bbf6f052 RK |
3284 | |
3285 | rtx | |
3286 | force_operand (value, target) | |
3287 | rtx value, target; | |
3288 | { | |
3289 | register optab binoptab = 0; | |
3290 | /* Use a temporary to force order of execution of calls to | |
3291 | `force_operand'. */ | |
3292 | rtx tmp; | |
3293 | register rtx op2; | |
3294 | /* Use subtarget as the target for operand 0 of a binary operation. */ | |
3295 | register rtx subtarget = (target != 0 && GET_CODE (target) == REG ? target : 0); | |
3296 | ||
3297 | if (GET_CODE (value) == PLUS) | |
3298 | binoptab = add_optab; | |
3299 | else if (GET_CODE (value) == MINUS) | |
3300 | binoptab = sub_optab; | |
3301 | else if (GET_CODE (value) == MULT) | |
3302 | { | |
3303 | op2 = XEXP (value, 1); | |
3304 | if (!CONSTANT_P (op2) | |
3305 | && !(GET_CODE (op2) == REG && op2 != subtarget)) | |
3306 | subtarget = 0; | |
3307 | tmp = force_operand (XEXP (value, 0), subtarget); | |
3308 | return expand_mult (GET_MODE (value), tmp, | |
906c4e36 | 3309 | force_operand (op2, NULL_RTX), |
bbf6f052 RK |
3310 | target, 0); |
3311 | } | |
3312 | ||
3313 | if (binoptab) | |
3314 | { | |
3315 | op2 = XEXP (value, 1); | |
3316 | if (!CONSTANT_P (op2) | |
3317 | && !(GET_CODE (op2) == REG && op2 != subtarget)) | |
3318 | subtarget = 0; | |
3319 | if (binoptab == sub_optab && GET_CODE (op2) == CONST_INT) | |
3320 | { | |
3321 | binoptab = add_optab; | |
3322 | op2 = negate_rtx (GET_MODE (value), op2); | |
3323 | } | |
3324 | ||
3325 | /* Check for an addition with OP2 a constant integer and our first | |
3326 | operand a PLUS of a virtual register and something else. In that | |
3327 | case, we want to emit the sum of the virtual register and the | |
3328 | constant first and then add the other value. This allows virtual | |
3329 | register instantiation to simply modify the constant rather than | |
3330 | creating another one around this addition. */ | |
3331 | if (binoptab == add_optab && GET_CODE (op2) == CONST_INT | |
3332 | && GET_CODE (XEXP (value, 0)) == PLUS | |
3333 | && GET_CODE (XEXP (XEXP (value, 0), 0)) == REG | |
3334 | && REGNO (XEXP (XEXP (value, 0), 0)) >= FIRST_VIRTUAL_REGISTER | |
3335 | && REGNO (XEXP (XEXP (value, 0), 0)) <= LAST_VIRTUAL_REGISTER) | |
3336 | { | |
3337 | rtx temp = expand_binop (GET_MODE (value), binoptab, | |
3338 | XEXP (XEXP (value, 0), 0), op2, | |
3339 | subtarget, 0, OPTAB_LIB_WIDEN); | |
3340 | return expand_binop (GET_MODE (value), binoptab, temp, | |
3341 | force_operand (XEXP (XEXP (value, 0), 1), 0), | |
3342 | target, 0, OPTAB_LIB_WIDEN); | |
3343 | } | |
3344 | ||
3345 | tmp = force_operand (XEXP (value, 0), subtarget); | |
3346 | return expand_binop (GET_MODE (value), binoptab, tmp, | |
906c4e36 | 3347 | force_operand (op2, NULL_RTX), |
bbf6f052 | 3348 | target, 0, OPTAB_LIB_WIDEN); |
8008b228 | 3349 | /* We give UNSIGNEDP = 0 to expand_binop |
bbf6f052 RK |
3350 | because the only operations we are expanding here are signed ones. */ |
3351 | } | |
3352 | return value; | |
3353 | } | |
3354 | \f | |
3355 | /* Subroutine of expand_expr: | |
3356 | save the non-copied parts (LIST) of an expr (LHS), and return a list | |
3357 | which can restore these values to their previous values, | |
3358 | should something modify their storage. */ | |
3359 | ||
3360 | static tree | |
3361 | save_noncopied_parts (lhs, list) | |
3362 | tree lhs; | |
3363 | tree list; | |
3364 | { | |
3365 | tree tail; | |
3366 | tree parts = 0; | |
3367 | ||
3368 | for (tail = list; tail; tail = TREE_CHAIN (tail)) | |
3369 | if (TREE_CODE (TREE_VALUE (tail)) == TREE_LIST) | |
3370 | parts = chainon (parts, save_noncopied_parts (lhs, TREE_VALUE (tail))); | |
3371 | else | |
3372 | { | |
3373 | tree part = TREE_VALUE (tail); | |
3374 | tree part_type = TREE_TYPE (part); | |
906c4e36 | 3375 | tree to_be_saved = build (COMPONENT_REF, part_type, lhs, part); |
bbf6f052 RK |
3376 | rtx target = assign_stack_temp (TYPE_MODE (part_type), |
3377 | int_size_in_bytes (part_type), 0); | |
3378 | if (! memory_address_p (TYPE_MODE (part_type), XEXP (target, 0))) | |
906c4e36 | 3379 | target = change_address (target, TYPE_MODE (part_type), NULL_RTX); |
bbf6f052 | 3380 | parts = tree_cons (to_be_saved, |
906c4e36 RK |
3381 | build (RTL_EXPR, part_type, NULL_TREE, |
3382 | (tree) target), | |
bbf6f052 RK |
3383 | parts); |
3384 | store_expr (TREE_PURPOSE (parts), RTL_EXPR_RTL (TREE_VALUE (parts)), 0); | |
3385 | } | |
3386 | return parts; | |
3387 | } | |
3388 | ||
3389 | /* Subroutine of expand_expr: | |
3390 | record the non-copied parts (LIST) of an expr (LHS), and return a list | |
3391 | which specifies the initial values of these parts. */ | |
3392 | ||
3393 | static tree | |
3394 | init_noncopied_parts (lhs, list) | |
3395 | tree lhs; | |
3396 | tree list; | |
3397 | { | |
3398 | tree tail; | |
3399 | tree parts = 0; | |
3400 | ||
3401 | for (tail = list; tail; tail = TREE_CHAIN (tail)) | |
3402 | if (TREE_CODE (TREE_VALUE (tail)) == TREE_LIST) | |
3403 | parts = chainon (parts, init_noncopied_parts (lhs, TREE_VALUE (tail))); | |
3404 | else | |
3405 | { | |
3406 | tree part = TREE_VALUE (tail); | |
3407 | tree part_type = TREE_TYPE (part); | |
906c4e36 | 3408 | tree to_be_initialized = build (COMPONENT_REF, part_type, lhs, part); |
bbf6f052 RK |
3409 | parts = tree_cons (TREE_PURPOSE (tail), to_be_initialized, parts); |
3410 | } | |
3411 | return parts; | |
3412 | } | |
3413 | ||
3414 | /* Subroutine of expand_expr: return nonzero iff there is no way that | |
3415 | EXP can reference X, which is being modified. */ | |
3416 | ||
3417 | static int | |
3418 | safe_from_p (x, exp) | |
3419 | rtx x; | |
3420 | tree exp; | |
3421 | { | |
3422 | rtx exp_rtl = 0; | |
3423 | int i, nops; | |
3424 | ||
3425 | if (x == 0) | |
3426 | return 1; | |
3427 | ||
3428 | /* If this is a subreg of a hard register, declare it unsafe, otherwise, | |
3429 | find the underlying pseudo. */ | |
3430 | if (GET_CODE (x) == SUBREG) | |
3431 | { | |
3432 | x = SUBREG_REG (x); | |
3433 | if (GET_CODE (x) == REG && REGNO (x) < FIRST_PSEUDO_REGISTER) | |
3434 | return 0; | |
3435 | } | |
3436 | ||
3437 | /* If X is a location in the outgoing argument area, it is always safe. */ | |
3438 | if (GET_CODE (x) == MEM | |
3439 | && (XEXP (x, 0) == virtual_outgoing_args_rtx | |
3440 | || (GET_CODE (XEXP (x, 0)) == PLUS | |
3441 | && XEXP (XEXP (x, 0), 0) == virtual_outgoing_args_rtx))) | |
3442 | return 1; | |
3443 | ||
3444 | switch (TREE_CODE_CLASS (TREE_CODE (exp))) | |
3445 | { | |
3446 | case 'd': | |
3447 | exp_rtl = DECL_RTL (exp); | |
3448 | break; | |
3449 | ||
3450 | case 'c': | |
3451 | return 1; | |
3452 | ||
3453 | case 'x': | |
3454 | if (TREE_CODE (exp) == TREE_LIST) | |
f32fd778 RS |
3455 | return ((TREE_VALUE (exp) == 0 |
3456 | || safe_from_p (x, TREE_VALUE (exp))) | |
bbf6f052 RK |
3457 | && (TREE_CHAIN (exp) == 0 |
3458 | || safe_from_p (x, TREE_CHAIN (exp)))); | |
3459 | else | |
3460 | return 0; | |
3461 | ||
3462 | case '1': | |
3463 | return safe_from_p (x, TREE_OPERAND (exp, 0)); | |
3464 | ||
3465 | case '2': | |
3466 | case '<': | |
3467 | return (safe_from_p (x, TREE_OPERAND (exp, 0)) | |
3468 | && safe_from_p (x, TREE_OPERAND (exp, 1))); | |
3469 | ||
3470 | case 'e': | |
3471 | case 'r': | |
3472 | /* Now do code-specific tests. EXP_RTL is set to any rtx we find in | |
3473 | the expression. If it is set, we conflict iff we are that rtx or | |
3474 | both are in memory. Otherwise, we check all operands of the | |
3475 | expression recursively. */ | |
3476 | ||
3477 | switch (TREE_CODE (exp)) | |
3478 | { | |
3479 | case ADDR_EXPR: | |
e44842fe RK |
3480 | return (staticp (TREE_OPERAND (exp, 0)) |
3481 | || safe_from_p (x, TREE_OPERAND (exp, 0))); | |
bbf6f052 RK |
3482 | |
3483 | case INDIRECT_REF: | |
3484 | if (GET_CODE (x) == MEM) | |
3485 | return 0; | |
3486 | break; | |
3487 | ||
3488 | case CALL_EXPR: | |
3489 | exp_rtl = CALL_EXPR_RTL (exp); | |
3490 | if (exp_rtl == 0) | |
3491 | { | |
3492 | /* Assume that the call will clobber all hard registers and | |
3493 | all of memory. */ | |
3494 | if ((GET_CODE (x) == REG && REGNO (x) < FIRST_PSEUDO_REGISTER) | |
3495 | || GET_CODE (x) == MEM) | |
3496 | return 0; | |
3497 | } | |
3498 | ||
3499 | break; | |
3500 | ||
3501 | case RTL_EXPR: | |
3502 | exp_rtl = RTL_EXPR_RTL (exp); | |
3503 | if (exp_rtl == 0) | |
3504 | /* We don't know what this can modify. */ | |
3505 | return 0; | |
3506 | ||
3507 | break; | |
3508 | ||
3509 | case WITH_CLEANUP_EXPR: | |
3510 | exp_rtl = RTL_EXPR_RTL (exp); | |
3511 | break; | |
3512 | ||
3513 | case SAVE_EXPR: | |
3514 | exp_rtl = SAVE_EXPR_RTL (exp); | |
3515 | break; | |
3516 | ||
8129842c RS |
3517 | case BIND_EXPR: |
3518 | /* The only operand we look at is operand 1. The rest aren't | |
3519 | part of the expression. */ | |
3520 | return safe_from_p (x, TREE_OPERAND (exp, 1)); | |
3521 | ||
bbf6f052 RK |
3522 | case METHOD_CALL_EXPR: |
3523 | /* This takes a rtx argument, but shouldn't appear here. */ | |
3524 | abort (); | |
3525 | } | |
3526 | ||
3527 | /* If we have an rtx, we do not need to scan our operands. */ | |
3528 | if (exp_rtl) | |
3529 | break; | |
3530 | ||
3531 | nops = tree_code_length[(int) TREE_CODE (exp)]; | |
3532 | for (i = 0; i < nops; i++) | |
3533 | if (TREE_OPERAND (exp, i) != 0 | |
3534 | && ! safe_from_p (x, TREE_OPERAND (exp, i))) | |
3535 | return 0; | |
3536 | } | |
3537 | ||
3538 | /* If we have an rtl, find any enclosed object. Then see if we conflict | |
3539 | with it. */ | |
3540 | if (exp_rtl) | |
3541 | { | |
3542 | if (GET_CODE (exp_rtl) == SUBREG) | |
3543 | { | |
3544 | exp_rtl = SUBREG_REG (exp_rtl); | |
3545 | if (GET_CODE (exp_rtl) == REG | |
3546 | && REGNO (exp_rtl) < FIRST_PSEUDO_REGISTER) | |
3547 | return 0; | |
3548 | } | |
3549 | ||
3550 | /* If the rtl is X, then it is not safe. Otherwise, it is unless both | |
3551 | are memory and EXP is not readonly. */ | |
3552 | return ! (rtx_equal_p (x, exp_rtl) | |
3553 | || (GET_CODE (x) == MEM && GET_CODE (exp_rtl) == MEM | |
3554 | && ! TREE_READONLY (exp))); | |
3555 | } | |
3556 | ||
3557 | /* If we reach here, it is safe. */ | |
3558 | return 1; | |
3559 | } | |
3560 | ||
3561 | /* Subroutine of expand_expr: return nonzero iff EXP is an | |
3562 | expression whose type is statically determinable. */ | |
3563 | ||
3564 | static int | |
3565 | fixed_type_p (exp) | |
3566 | tree exp; | |
3567 | { | |
3568 | if (TREE_CODE (exp) == PARM_DECL | |
3569 | || TREE_CODE (exp) == VAR_DECL | |
3570 | || TREE_CODE (exp) == CALL_EXPR || TREE_CODE (exp) == TARGET_EXPR | |
3571 | || TREE_CODE (exp) == COMPONENT_REF | |
3572 | || TREE_CODE (exp) == ARRAY_REF) | |
3573 | return 1; | |
3574 | return 0; | |
3575 | } | |
3576 | \f | |
3577 | /* expand_expr: generate code for computing expression EXP. | |
3578 | An rtx for the computed value is returned. The value is never null. | |
3579 | In the case of a void EXP, const0_rtx is returned. | |
3580 | ||
3581 | The value may be stored in TARGET if TARGET is nonzero. | |
3582 | TARGET is just a suggestion; callers must assume that | |
3583 | the rtx returned may not be the same as TARGET. | |
3584 | ||
3585 | If TARGET is CONST0_RTX, it means that the value will be ignored. | |
3586 | ||
3587 | If TMODE is not VOIDmode, it suggests generating the | |
3588 | result in mode TMODE. But this is done only when convenient. | |
3589 | Otherwise, TMODE is ignored and the value generated in its natural mode. | |
3590 | TMODE is just a suggestion; callers must assume that | |
3591 | the rtx returned may not have mode TMODE. | |
3592 | ||
d6a5ac33 RK |
3593 | Note that TARGET may have neither TMODE nor MODE. In that case, it |
3594 | probably will not be used. | |
bbf6f052 RK |
3595 | |
3596 | If MODIFIER is EXPAND_SUM then when EXP is an addition | |
3597 | we can return an rtx of the form (MULT (REG ...) (CONST_INT ...)) | |
3598 | or a nest of (PLUS ...) and (MINUS ...) where the terms are | |
3599 | products as above, or REG or MEM, or constant. | |
3600 | Ordinarily in such cases we would output mul or add instructions | |
3601 | and then return a pseudo reg containing the sum. | |
3602 | ||
3603 | EXPAND_INITIALIZER is much like EXPAND_SUM except that | |
3604 | it also marks a label as absolutely required (it can't be dead). | |
26fcb35a | 3605 | It also makes a ZERO_EXTEND or SIGN_EXTEND instead of emitting extend insns. |
d6a5ac33 RK |
3606 | This is used for outputting expressions used in initializers. |
3607 | ||
3608 | EXPAND_CONST_ADDRESS says that it is okay to return a MEM | |
3609 | with a constant address even if that address is not normally legitimate. | |
3610 | EXPAND_INITIALIZER and EXPAND_SUM also have this effect. */ | |
bbf6f052 RK |
3611 | |
3612 | rtx | |
3613 | expand_expr (exp, target, tmode, modifier) | |
3614 | register tree exp; | |
3615 | rtx target; | |
3616 | enum machine_mode tmode; | |
3617 | enum expand_modifier modifier; | |
3618 | { | |
b50d17a1 RK |
3619 | /* Chain of pending expressions for PLACEHOLDER_EXPR to replace. |
3620 | This is static so it will be accessible to our recursive callees. */ | |
3621 | static tree placeholder_list = 0; | |
bbf6f052 RK |
3622 | register rtx op0, op1, temp; |
3623 | tree type = TREE_TYPE (exp); | |
3624 | int unsignedp = TREE_UNSIGNED (type); | |
3625 | register enum machine_mode mode = TYPE_MODE (type); | |
3626 | register enum tree_code code = TREE_CODE (exp); | |
3627 | optab this_optab; | |
3628 | /* Use subtarget as the target for operand 0 of a binary operation. */ | |
3629 | rtx subtarget = (target != 0 && GET_CODE (target) == REG ? target : 0); | |
3630 | rtx original_target = target; | |
ca695ac9 | 3631 | /* Maybe defer this until sure not doing bytecode? */ |
dd27116b RK |
3632 | int ignore = (target == const0_rtx |
3633 | || ((code == NON_LVALUE_EXPR || code == NOP_EXPR | |
4d87de75 RS |
3634 | || code == CONVERT_EXPR || code == REFERENCE_EXPR |
3635 | || code == COND_EXPR) | |
dd27116b | 3636 | && TREE_CODE (type) == VOID_TYPE)); |
bbf6f052 RK |
3637 | tree context; |
3638 | ||
ca695ac9 | 3639 | |
1d556704 | 3640 | if (output_bytecode && modifier != EXPAND_INITIALIZER) |
ca695ac9 JB |
3641 | { |
3642 | bc_expand_expr (exp); | |
3643 | return NULL; | |
3644 | } | |
3645 | ||
bbf6f052 RK |
3646 | /* Don't use hard regs as subtargets, because the combiner |
3647 | can only handle pseudo regs. */ | |
3648 | if (subtarget && REGNO (subtarget) < FIRST_PSEUDO_REGISTER) | |
3649 | subtarget = 0; | |
3650 | /* Avoid subtargets inside loops, | |
3651 | since they hide some invariant expressions. */ | |
3652 | if (preserve_subexpressions_p ()) | |
3653 | subtarget = 0; | |
3654 | ||
dd27116b RK |
3655 | /* If we are going to ignore this result, we need only do something |
3656 | if there is a side-effect somewhere in the expression. If there | |
b50d17a1 RK |
3657 | is, short-circuit the most common cases here. Note that we must |
3658 | not call expand_expr with anything but const0_rtx in case this | |
3659 | is an initial expansion of a size that contains a PLACEHOLDER_EXPR. */ | |
bbf6f052 | 3660 | |
dd27116b RK |
3661 | if (ignore) |
3662 | { | |
3663 | if (! TREE_SIDE_EFFECTS (exp)) | |
3664 | return const0_rtx; | |
3665 | ||
3666 | /* Ensure we reference a volatile object even if value is ignored. */ | |
3667 | if (TREE_THIS_VOLATILE (exp) | |
3668 | && TREE_CODE (exp) != FUNCTION_DECL | |
3669 | && mode != VOIDmode && mode != BLKmode) | |
3670 | { | |
3671 | temp = expand_expr (exp, NULL_RTX, VOIDmode, modifier); | |
3672 | if (GET_CODE (temp) == MEM) | |
3673 | temp = copy_to_reg (temp); | |
3674 | return const0_rtx; | |
3675 | } | |
3676 | ||
3677 | if (TREE_CODE_CLASS (code) == '1') | |
3678 | return expand_expr (TREE_OPERAND (exp, 0), const0_rtx, | |
3679 | VOIDmode, modifier); | |
3680 | else if (TREE_CODE_CLASS (code) == '2' | |
3681 | || TREE_CODE_CLASS (code) == '<') | |
3682 | { | |
3683 | expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, modifier); | |
3684 | expand_expr (TREE_OPERAND (exp, 1), const0_rtx, VOIDmode, modifier); | |
3685 | return const0_rtx; | |
3686 | } | |
3687 | else if ((code == TRUTH_ANDIF_EXPR || code == TRUTH_ORIF_EXPR) | |
3688 | && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 1))) | |
3689 | /* If the second operand has no side effects, just evaluate | |
3690 | the first. */ | |
3691 | return expand_expr (TREE_OPERAND (exp, 0), const0_rtx, | |
3692 | VOIDmode, modifier); | |
dd27116b | 3693 | |
90764a87 | 3694 | target = 0; |
dd27116b | 3695 | } |
bbf6f052 | 3696 | |
e44842fe RK |
3697 | /* If will do cse, generate all results into pseudo registers |
3698 | since 1) that allows cse to find more things | |
3699 | and 2) otherwise cse could produce an insn the machine | |
3700 | cannot support. */ | |
3701 | ||
bbf6f052 RK |
3702 | if (! cse_not_expected && mode != BLKmode && target |
3703 | && (GET_CODE (target) != REG || REGNO (target) < FIRST_PSEUDO_REGISTER)) | |
3704 | target = subtarget; | |
3705 | ||
bbf6f052 RK |
3706 | switch (code) |
3707 | { | |
3708 | case LABEL_DECL: | |
b552441b RS |
3709 | { |
3710 | tree function = decl_function_context (exp); | |
3711 | /* Handle using a label in a containing function. */ | |
3712 | if (function != current_function_decl && function != 0) | |
3713 | { | |
3714 | struct function *p = find_function_data (function); | |
3715 | /* Allocate in the memory associated with the function | |
3716 | that the label is in. */ | |
3717 | push_obstacks (p->function_obstack, | |
3718 | p->function_maybepermanent_obstack); | |
3719 | ||
3720 | p->forced_labels = gen_rtx (EXPR_LIST, VOIDmode, | |
3721 | label_rtx (exp), p->forced_labels); | |
3722 | pop_obstacks (); | |
3723 | } | |
3724 | else if (modifier == EXPAND_INITIALIZER) | |
3725 | forced_labels = gen_rtx (EXPR_LIST, VOIDmode, | |
3726 | label_rtx (exp), forced_labels); | |
26fcb35a | 3727 | temp = gen_rtx (MEM, FUNCTION_MODE, |
b552441b | 3728 | gen_rtx (LABEL_REF, Pmode, label_rtx (exp))); |
26fcb35a RS |
3729 | if (function != current_function_decl && function != 0) |
3730 | LABEL_REF_NONLOCAL_P (XEXP (temp, 0)) = 1; | |
3731 | return temp; | |
b552441b | 3732 | } |
bbf6f052 RK |
3733 | |
3734 | case PARM_DECL: | |
3735 | if (DECL_RTL (exp) == 0) | |
3736 | { | |
3737 | error_with_decl (exp, "prior parameter's size depends on `%s'"); | |
4af3895e | 3738 | return CONST0_RTX (mode); |
bbf6f052 RK |
3739 | } |
3740 | ||
d6a5ac33 RK |
3741 | /* ... fall through ... */ |
3742 | ||
bbf6f052 | 3743 | case VAR_DECL: |
2dca20cd RS |
3744 | /* If a static var's type was incomplete when the decl was written, |
3745 | but the type is complete now, lay out the decl now. */ | |
3746 | if (DECL_SIZE (exp) == 0 && TYPE_SIZE (TREE_TYPE (exp)) != 0 | |
3747 | && (TREE_STATIC (exp) || DECL_EXTERNAL (exp))) | |
3748 | { | |
3749 | push_obstacks_nochange (); | |
3750 | end_temporary_allocation (); | |
3751 | layout_decl (exp, 0); | |
3752 | PUT_MODE (DECL_RTL (exp), DECL_MODE (exp)); | |
3753 | pop_obstacks (); | |
3754 | } | |
d6a5ac33 RK |
3755 | |
3756 | /* ... fall through ... */ | |
3757 | ||
2dca20cd | 3758 | case FUNCTION_DECL: |
bbf6f052 RK |
3759 | case RESULT_DECL: |
3760 | if (DECL_RTL (exp) == 0) | |
3761 | abort (); | |
d6a5ac33 | 3762 | |
e44842fe RK |
3763 | /* Ensure variable marked as used even if it doesn't go through |
3764 | a parser. If it hasn't be used yet, write out an external | |
3765 | definition. */ | |
3766 | if (! TREE_USED (exp)) | |
3767 | { | |
3768 | assemble_external (exp); | |
3769 | TREE_USED (exp) = 1; | |
3770 | } | |
3771 | ||
bbf6f052 RK |
3772 | /* Handle variables inherited from containing functions. */ |
3773 | context = decl_function_context (exp); | |
3774 | ||
3775 | /* We treat inline_function_decl as an alias for the current function | |
3776 | because that is the inline function whose vars, types, etc. | |
3777 | are being merged into the current function. | |
3778 | See expand_inline_function. */ | |
d6a5ac33 | 3779 | |
bbf6f052 RK |
3780 | if (context != 0 && context != current_function_decl |
3781 | && context != inline_function_decl | |
3782 | /* If var is static, we don't need a static chain to access it. */ | |
3783 | && ! (GET_CODE (DECL_RTL (exp)) == MEM | |
3784 | && CONSTANT_P (XEXP (DECL_RTL (exp), 0)))) | |
3785 | { | |
3786 | rtx addr; | |
3787 | ||
3788 | /* Mark as non-local and addressable. */ | |
81feeecb | 3789 | DECL_NONLOCAL (exp) = 1; |
bbf6f052 RK |
3790 | mark_addressable (exp); |
3791 | if (GET_CODE (DECL_RTL (exp)) != MEM) | |
3792 | abort (); | |
3793 | addr = XEXP (DECL_RTL (exp), 0); | |
3794 | if (GET_CODE (addr) == MEM) | |
d6a5ac33 RK |
3795 | addr = gen_rtx (MEM, Pmode, |
3796 | fix_lexical_addr (XEXP (addr, 0), exp)); | |
bbf6f052 RK |
3797 | else |
3798 | addr = fix_lexical_addr (addr, exp); | |
3799 | return change_address (DECL_RTL (exp), mode, addr); | |
3800 | } | |
4af3895e | 3801 | |
bbf6f052 RK |
3802 | /* This is the case of an array whose size is to be determined |
3803 | from its initializer, while the initializer is still being parsed. | |
3804 | See expand_decl. */ | |
d6a5ac33 | 3805 | |
bbf6f052 RK |
3806 | if (GET_CODE (DECL_RTL (exp)) == MEM |
3807 | && GET_CODE (XEXP (DECL_RTL (exp), 0)) == REG) | |
3808 | return change_address (DECL_RTL (exp), GET_MODE (DECL_RTL (exp)), | |
3809 | XEXP (DECL_RTL (exp), 0)); | |
d6a5ac33 RK |
3810 | |
3811 | /* If DECL_RTL is memory, we are in the normal case and either | |
3812 | the address is not valid or it is not a register and -fforce-addr | |
3813 | is specified, get the address into a register. */ | |
3814 | ||
bbf6f052 RK |
3815 | if (GET_CODE (DECL_RTL (exp)) == MEM |
3816 | && modifier != EXPAND_CONST_ADDRESS | |
3817 | && modifier != EXPAND_SUM | |
d6a5ac33 RK |
3818 | && modifier != EXPAND_INITIALIZER |
3819 | && (! memory_address_p (DECL_MODE (exp), XEXP (DECL_RTL (exp), 0)) | |
bbf6f052 | 3820 | || (flag_force_addr |
d6a5ac33 RK |
3821 | && GET_CODE (XEXP (DECL_RTL (exp), 0)) != REG))) |
3822 | return change_address (DECL_RTL (exp), VOIDmode, | |
3823 | copy_rtx (XEXP (DECL_RTL (exp), 0))); | |
1499e0a8 RK |
3824 | |
3825 | /* If the mode of DECL_RTL does not match that of the decl, it | |
3826 | must be a promoted value. We return a SUBREG of the wanted mode, | |
3827 | but mark it so that we know that it was already extended. */ | |
3828 | ||
3829 | if (GET_CODE (DECL_RTL (exp)) == REG | |
3830 | && GET_MODE (DECL_RTL (exp)) != mode) | |
3831 | { | |
3832 | enum machine_mode decl_mode = DECL_MODE (exp); | |
3833 | ||
3834 | /* Get the signedness used for this variable. Ensure we get the | |
3835 | same mode we got when the variable was declared. */ | |
3836 | ||
3837 | PROMOTE_MODE (decl_mode, unsignedp, type); | |
3838 | ||
3839 | if (decl_mode != GET_MODE (DECL_RTL (exp))) | |
3840 | abort (); | |
3841 | ||
3842 | temp = gen_rtx (SUBREG, mode, DECL_RTL (exp), 0); | |
3843 | SUBREG_PROMOTED_VAR_P (temp) = 1; | |
3844 | SUBREG_PROMOTED_UNSIGNED_P (temp) = unsignedp; | |
3845 | return temp; | |
3846 | } | |
3847 | ||
bbf6f052 RK |
3848 | return DECL_RTL (exp); |
3849 | ||
3850 | case INTEGER_CST: | |
3851 | return immed_double_const (TREE_INT_CST_LOW (exp), | |
3852 | TREE_INT_CST_HIGH (exp), | |
3853 | mode); | |
3854 | ||
3855 | case CONST_DECL: | |
3856 | return expand_expr (DECL_INITIAL (exp), target, VOIDmode, 0); | |
3857 | ||
3858 | case REAL_CST: | |
3859 | /* If optimized, generate immediate CONST_DOUBLE | |
3860 | which will be turned into memory by reload if necessary. | |
3861 | ||
3862 | We used to force a register so that loop.c could see it. But | |
3863 | this does not allow gen_* patterns to perform optimizations with | |
3864 | the constants. It also produces two insns in cases like "x = 1.0;". | |
3865 | On most machines, floating-point constants are not permitted in | |
3866 | many insns, so we'd end up copying it to a register in any case. | |
3867 | ||
3868 | Now, we do the copying in expand_binop, if appropriate. */ | |
3869 | return immed_real_const (exp); | |
3870 | ||
3871 | case COMPLEX_CST: | |
3872 | case STRING_CST: | |
3873 | if (! TREE_CST_RTL (exp)) | |
3874 | output_constant_def (exp); | |
3875 | ||
3876 | /* TREE_CST_RTL probably contains a constant address. | |
3877 | On RISC machines where a constant address isn't valid, | |
3878 | make some insns to get that address into a register. */ | |
3879 | if (GET_CODE (TREE_CST_RTL (exp)) == MEM | |
3880 | && modifier != EXPAND_CONST_ADDRESS | |
3881 | && modifier != EXPAND_INITIALIZER | |
3882 | && modifier != EXPAND_SUM | |
d6a5ac33 RK |
3883 | && (! memory_address_p (mode, XEXP (TREE_CST_RTL (exp), 0)) |
3884 | || (flag_force_addr | |
3885 | && GET_CODE (XEXP (TREE_CST_RTL (exp), 0)) != REG))) | |
bbf6f052 RK |
3886 | return change_address (TREE_CST_RTL (exp), VOIDmode, |
3887 | copy_rtx (XEXP (TREE_CST_RTL (exp), 0))); | |
3888 | return TREE_CST_RTL (exp); | |
3889 | ||
3890 | case SAVE_EXPR: | |
3891 | context = decl_function_context (exp); | |
d6a5ac33 | 3892 | |
bbf6f052 RK |
3893 | /* We treat inline_function_decl as an alias for the current function |
3894 | because that is the inline function whose vars, types, etc. | |
3895 | are being merged into the current function. | |
3896 | See expand_inline_function. */ | |
3897 | if (context == current_function_decl || context == inline_function_decl) | |
3898 | context = 0; | |
3899 | ||
3900 | /* If this is non-local, handle it. */ | |
3901 | if (context) | |
3902 | { | |
3903 | temp = SAVE_EXPR_RTL (exp); | |
3904 | if (temp && GET_CODE (temp) == REG) | |
3905 | { | |
3906 | put_var_into_stack (exp); | |
3907 | temp = SAVE_EXPR_RTL (exp); | |
3908 | } | |
3909 | if (temp == 0 || GET_CODE (temp) != MEM) | |
3910 | abort (); | |
3911 | return change_address (temp, mode, | |
3912 | fix_lexical_addr (XEXP (temp, 0), exp)); | |
3913 | } | |
3914 | if (SAVE_EXPR_RTL (exp) == 0) | |
3915 | { | |
3916 | if (mode == BLKmode) | |
34a25822 RK |
3917 | { |
3918 | temp | |
3919 | = assign_stack_temp (mode, int_size_in_bytes (type), 0); | |
3920 | MEM_IN_STRUCT_P (temp) | |
3921 | = (TREE_CODE (type) == RECORD_TYPE | |
3922 | || TREE_CODE (type) == UNION_TYPE | |
3923 | || TREE_CODE (type) == QUAL_UNION_TYPE | |
3924 | || TREE_CODE (type) == ARRAY_TYPE); | |
3925 | } | |
bbf6f052 | 3926 | else |
1499e0a8 RK |
3927 | { |
3928 | enum machine_mode var_mode = mode; | |
3929 | ||
3930 | if (TREE_CODE (type) == INTEGER_TYPE | |
3931 | || TREE_CODE (type) == ENUMERAL_TYPE | |
3932 | || TREE_CODE (type) == BOOLEAN_TYPE | |
3933 | || TREE_CODE (type) == CHAR_TYPE | |
3934 | || TREE_CODE (type) == REAL_TYPE | |
3935 | || TREE_CODE (type) == POINTER_TYPE | |
3936 | || TREE_CODE (type) == OFFSET_TYPE) | |
3937 | { | |
3938 | PROMOTE_MODE (var_mode, unsignedp, type); | |
3939 | } | |
3940 | ||
3941 | temp = gen_reg_rtx (var_mode); | |
3942 | } | |
3943 | ||
bbf6f052 | 3944 | SAVE_EXPR_RTL (exp) = temp; |
bbf6f052 RK |
3945 | if (!optimize && GET_CODE (temp) == REG) |
3946 | save_expr_regs = gen_rtx (EXPR_LIST, VOIDmode, temp, | |
3947 | save_expr_regs); | |
ff78f773 RK |
3948 | |
3949 | /* If the mode of TEMP does not match that of the expression, it | |
3950 | must be a promoted value. We pass store_expr a SUBREG of the | |
3951 | wanted mode but mark it so that we know that it was already | |
3952 | extended. Note that `unsignedp' was modified above in | |
3953 | this case. */ | |
3954 | ||
3955 | if (GET_CODE (temp) == REG && GET_MODE (temp) != mode) | |
3956 | { | |
3957 | temp = gen_rtx (SUBREG, mode, SAVE_EXPR_RTL (exp), 0); | |
3958 | SUBREG_PROMOTED_VAR_P (temp) = 1; | |
3959 | SUBREG_PROMOTED_UNSIGNED_P (temp) = unsignedp; | |
3960 | } | |
3961 | ||
3962 | store_expr (TREE_OPERAND (exp, 0), temp, 0); | |
bbf6f052 | 3963 | } |
1499e0a8 RK |
3964 | |
3965 | /* If the mode of SAVE_EXPR_RTL does not match that of the expression, it | |
3966 | must be a promoted value. We return a SUBREG of the wanted mode, | |
adc22a04 | 3967 | but mark it so that we know that it was already extended. */ |
1499e0a8 RK |
3968 | |
3969 | if (GET_CODE (SAVE_EXPR_RTL (exp)) == REG | |
3970 | && GET_MODE (SAVE_EXPR_RTL (exp)) != mode) | |
3971 | { | |
adc22a04 RK |
3972 | enum machine_mode var_mode = mode; |
3973 | ||
3974 | if (TREE_CODE (type) == INTEGER_TYPE | |
3975 | || TREE_CODE (type) == ENUMERAL_TYPE | |
3976 | || TREE_CODE (type) == BOOLEAN_TYPE | |
3977 | || TREE_CODE (type) == CHAR_TYPE | |
3978 | || TREE_CODE (type) == REAL_TYPE | |
3979 | || TREE_CODE (type) == POINTER_TYPE | |
3980 | || TREE_CODE (type) == OFFSET_TYPE) | |
3981 | { | |
3982 | PROMOTE_MODE (var_mode, unsignedp, type); | |
3983 | } | |
3984 | ||
1499e0a8 RK |
3985 | temp = gen_rtx (SUBREG, mode, SAVE_EXPR_RTL (exp), 0); |
3986 | SUBREG_PROMOTED_VAR_P (temp) = 1; | |
3987 | SUBREG_PROMOTED_UNSIGNED_P (temp) = unsignedp; | |
3988 | return temp; | |
3989 | } | |
3990 | ||
bbf6f052 RK |
3991 | return SAVE_EXPR_RTL (exp); |
3992 | ||
b50d17a1 RK |
3993 | case PLACEHOLDER_EXPR: |
3994 | /* If there is an object on the head of the placeholder list, | |
3995 | see if some object in it's references is of type TYPE. For | |
3996 | further information, see tree.def. */ | |
3997 | if (placeholder_list) | |
3998 | { | |
3999 | tree object; | |
f59d43a9 | 4000 | tree old_list = placeholder_list; |
b50d17a1 RK |
4001 | |
4002 | for (object = TREE_PURPOSE (placeholder_list); | |
4003 | TREE_TYPE (object) != type | |
4004 | && (TREE_CODE_CLASS (TREE_CODE (object)) == 'r' | |
4805bfa0 RK |
4005 | || TREE_CODE_CLASS (TREE_CODE (object)) == '1' |
4006 | || TREE_CODE_CLASS (TREE_CODE (object)) == '2' | |
4007 | || TREE_CODE_CLASS (TREE_CODE (object)) == 'e'); | |
b50d17a1 RK |
4008 | object = TREE_OPERAND (object, 0)) |
4009 | ; | |
4010 | ||
4805bfa0 | 4011 | if (object && TREE_TYPE (object) == type) |
f59d43a9 RK |
4012 | { |
4013 | /* Expand this object skipping the list entries before | |
4014 | it was found in case it is also a PLACEHOLDER_EXPR. | |
4015 | In that case, we want to translate it using subsequent | |
4016 | entries. */ | |
4017 | placeholder_list = TREE_CHAIN (placeholder_list); | |
4018 | temp = expand_expr (object, original_target, tmode, modifier); | |
4019 | placeholder_list = old_list; | |
4020 | return temp; | |
4021 | } | |
b50d17a1 RK |
4022 | } |
4023 | ||
4024 | /* We can't find the object or there was a missing WITH_RECORD_EXPR. */ | |
4025 | abort (); | |
4026 | ||
4027 | case WITH_RECORD_EXPR: | |
4028 | /* Put the object on the placeholder list, expand our first operand, | |
4029 | and pop the list. */ | |
4030 | placeholder_list = tree_cons (TREE_OPERAND (exp, 1), NULL_TREE, | |
4031 | placeholder_list); | |
4032 | target = expand_expr (TREE_OPERAND (exp, 0), original_target, | |
4033 | tmode, modifier); | |
4034 | placeholder_list = TREE_CHAIN (placeholder_list); | |
4035 | return target; | |
4036 | ||
bbf6f052 | 4037 | case EXIT_EXPR: |
e44842fe RK |
4038 | expand_exit_loop_if_false (NULL_PTR, |
4039 | invert_truthvalue (TREE_OPERAND (exp, 0))); | |
bbf6f052 RK |
4040 | return const0_rtx; |
4041 | ||
4042 | case LOOP_EXPR: | |
0088fcb1 | 4043 | push_temp_slots (); |
bbf6f052 RK |
4044 | expand_start_loop (1); |
4045 | expand_expr_stmt (TREE_OPERAND (exp, 0)); | |
4046 | expand_end_loop (); | |
0088fcb1 | 4047 | pop_temp_slots (); |
bbf6f052 RK |
4048 | |
4049 | return const0_rtx; | |
4050 | ||
4051 | case BIND_EXPR: | |
4052 | { | |
4053 | tree vars = TREE_OPERAND (exp, 0); | |
4054 | int vars_need_expansion = 0; | |
4055 | ||
4056 | /* Need to open a binding contour here because | |
4057 | if there are any cleanups they most be contained here. */ | |
4058 | expand_start_bindings (0); | |
4059 | ||
2df53c0b RS |
4060 | /* Mark the corresponding BLOCK for output in its proper place. */ |
4061 | if (TREE_OPERAND (exp, 2) != 0 | |
4062 | && ! TREE_USED (TREE_OPERAND (exp, 2))) | |
4063 | insert_block (TREE_OPERAND (exp, 2)); | |
bbf6f052 RK |
4064 | |
4065 | /* If VARS have not yet been expanded, expand them now. */ | |
4066 | while (vars) | |
4067 | { | |
4068 | if (DECL_RTL (vars) == 0) | |
4069 | { | |
4070 | vars_need_expansion = 1; | |
4071 | expand_decl (vars); | |
4072 | } | |
4073 | expand_decl_init (vars); | |
4074 | vars = TREE_CHAIN (vars); | |
4075 | } | |
4076 | ||
4077 | temp = expand_expr (TREE_OPERAND (exp, 1), target, tmode, modifier); | |
4078 | ||
4079 | expand_end_bindings (TREE_OPERAND (exp, 0), 0, 0); | |
4080 | ||
4081 | return temp; | |
4082 | } | |
4083 | ||
4084 | case RTL_EXPR: | |
4085 | if (RTL_EXPR_SEQUENCE (exp) == const0_rtx) | |
4086 | abort (); | |
4087 | emit_insns (RTL_EXPR_SEQUENCE (exp)); | |
4088 | RTL_EXPR_SEQUENCE (exp) = const0_rtx; | |
99310285 | 4089 | preserve_rtl_expr_result (RTL_EXPR_RTL (exp)); |
ca814259 | 4090 | free_temps_for_rtl_expr (exp); |
bbf6f052 RK |
4091 | return RTL_EXPR_RTL (exp); |
4092 | ||
4093 | case CONSTRUCTOR: | |
dd27116b RK |
4094 | /* If we don't need the result, just ensure we evaluate any |
4095 | subexpressions. */ | |
4096 | if (ignore) | |
4097 | { | |
4098 | tree elt; | |
4099 | for (elt = CONSTRUCTOR_ELTS (exp); elt; elt = TREE_CHAIN (elt)) | |
4100 | expand_expr (TREE_VALUE (elt), const0_rtx, VOIDmode, 0); | |
4101 | return const0_rtx; | |
4102 | } | |
3207b172 | 4103 | |
4af3895e JVA |
4104 | /* All elts simple constants => refer to a constant in memory. But |
4105 | if this is a non-BLKmode mode, let it store a field at a time | |
4106 | since that should make a CONST_INT or CONST_DOUBLE when we | |
3207b172 RK |
4107 | fold. Likewise, if we have a target we can use, it is best to |
4108 | store directly into the target. If we are making an initializer and | |
4109 | all operands are constant, put it in memory as well. */ | |
dd27116b | 4110 | else if ((TREE_STATIC (exp) |
3207b172 RK |
4111 | && ((mode == BLKmode |
4112 | && ! (target != 0 && safe_from_p (target, exp))) | |
4113 | || TREE_ADDRESSABLE (exp))) | |
dd27116b | 4114 | || (modifier == EXPAND_INITIALIZER && TREE_CONSTANT (exp))) |
bbf6f052 RK |
4115 | { |
4116 | rtx constructor = output_constant_def (exp); | |
b552441b RS |
4117 | if (modifier != EXPAND_CONST_ADDRESS |
4118 | && modifier != EXPAND_INITIALIZER | |
4119 | && modifier != EXPAND_SUM | |
d6a5ac33 RK |
4120 | && (! memory_address_p (GET_MODE (constructor), |
4121 | XEXP (constructor, 0)) | |
4122 | || (flag_force_addr | |
4123 | && GET_CODE (XEXP (constructor, 0)) != REG))) | |
bbf6f052 RK |
4124 | constructor = change_address (constructor, VOIDmode, |
4125 | XEXP (constructor, 0)); | |
4126 | return constructor; | |
4127 | } | |
4128 | ||
bbf6f052 RK |
4129 | else |
4130 | { | |
4131 | if (target == 0 || ! safe_from_p (target, exp)) | |
4132 | { | |
4133 | if (mode != BLKmode && ! TREE_ADDRESSABLE (exp)) | |
d6a5ac33 | 4134 | target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode); |
bbf6f052 RK |
4135 | else |
4136 | { | |
3b94d087 RS |
4137 | enum tree_code c = TREE_CODE (type); |
4138 | target | |
4139 | = assign_stack_temp (mode, int_size_in_bytes (type), 0); | |
e7f3c83f RK |
4140 | if (c == RECORD_TYPE || c == UNION_TYPE |
4141 | || c == QUAL_UNION_TYPE || c == ARRAY_TYPE) | |
3b94d087 | 4142 | MEM_IN_STRUCT_P (target) = 1; |
bbf6f052 RK |
4143 | } |
4144 | } | |
4145 | store_constructor (exp, target); | |
4146 | return target; | |
4147 | } | |
4148 | ||
4149 | case INDIRECT_REF: | |
4150 | { | |
4151 | tree exp1 = TREE_OPERAND (exp, 0); | |
4152 | tree exp2; | |
4153 | ||
4154 | /* A SAVE_EXPR as the address in an INDIRECT_EXPR is generated | |
4155 | for *PTR += ANYTHING where PTR is put inside the SAVE_EXPR. | |
4156 | This code has the same general effect as simply doing | |
4157 | expand_expr on the save expr, except that the expression PTR | |
4158 | is computed for use as a memory address. This means different | |
4159 | code, suitable for indexing, may be generated. */ | |
4160 | if (TREE_CODE (exp1) == SAVE_EXPR | |
4161 | && SAVE_EXPR_RTL (exp1) == 0 | |
4162 | && TREE_CODE (exp2 = TREE_OPERAND (exp1, 0)) != ERROR_MARK | |
4163 | && TYPE_MODE (TREE_TYPE (exp1)) == Pmode | |
4164 | && TYPE_MODE (TREE_TYPE (exp2)) == Pmode) | |
4165 | { | |
906c4e36 RK |
4166 | temp = expand_expr (TREE_OPERAND (exp1, 0), NULL_RTX, |
4167 | VOIDmode, EXPAND_SUM); | |
bbf6f052 RK |
4168 | op0 = memory_address (mode, temp); |
4169 | op0 = copy_all_regs (op0); | |
4170 | SAVE_EXPR_RTL (exp1) = op0; | |
4171 | } | |
4172 | else | |
4173 | { | |
906c4e36 | 4174 | op0 = expand_expr (exp1, NULL_RTX, VOIDmode, EXPAND_SUM); |
bbf6f052 RK |
4175 | op0 = memory_address (mode, op0); |
4176 | } | |
8c8a8e34 JW |
4177 | |
4178 | temp = gen_rtx (MEM, mode, op0); | |
4179 | /* If address was computed by addition, | |
4180 | mark this as an element of an aggregate. */ | |
4181 | if (TREE_CODE (TREE_OPERAND (exp, 0)) == PLUS_EXPR | |
4182 | || (TREE_CODE (TREE_OPERAND (exp, 0)) == SAVE_EXPR | |
4183 | && TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) == PLUS_EXPR) | |
4184 | || TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE | |
4185 | || TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE | |
4186 | || TREE_CODE (TREE_TYPE (exp)) == UNION_TYPE | |
e7f3c83f | 4187 | || TREE_CODE (TREE_TYPE (exp)) == QUAL_UNION_TYPE |
8c8a8e34 JW |
4188 | || (TREE_CODE (exp1) == ADDR_EXPR |
4189 | && (exp2 = TREE_OPERAND (exp1, 0)) | |
4190 | && (TREE_CODE (TREE_TYPE (exp2)) == ARRAY_TYPE | |
4191 | || TREE_CODE (TREE_TYPE (exp2)) == RECORD_TYPE | |
e7f3c83f RK |
4192 | || TREE_CODE (TREE_TYPE (exp2)) == UNION_TYPE |
4193 | || TREE_CODE (TREE_TYPE (exp2)) == QUAL_UNION_TYPE))) | |
8c8a8e34 | 4194 | MEM_IN_STRUCT_P (temp) = 1; |
2c4c436a | 4195 | MEM_VOLATILE_P (temp) = TREE_THIS_VOLATILE (exp) | flag_volatile; |
89742723 | 4196 | #if 0 /* It is incorrect to set RTX_UNCHANGING_P here, because the fact that |
bbf6f052 RK |
4197 | a location is accessed through a pointer to const does not mean |
4198 | that the value there can never change. */ | |
8c8a8e34 | 4199 | RTX_UNCHANGING_P (temp) = TREE_READONLY (exp); |
bbf6f052 | 4200 | #endif |
8c8a8e34 JW |
4201 | return temp; |
4202 | } | |
bbf6f052 RK |
4203 | |
4204 | case ARRAY_REF: | |
742920c7 RK |
4205 | if (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) != ARRAY_TYPE) |
4206 | abort (); | |
bbf6f052 | 4207 | |
bbf6f052 | 4208 | { |
742920c7 RK |
4209 | tree array = TREE_OPERAND (exp, 0); |
4210 | tree domain = TYPE_DOMAIN (TREE_TYPE (array)); | |
4211 | tree low_bound = domain ? TYPE_MIN_VALUE (domain) : integer_zero_node; | |
4212 | tree index = TREE_OPERAND (exp, 1); | |
4213 | tree index_type = TREE_TYPE (index); | |
bbf6f052 | 4214 | int i; |
bbf6f052 | 4215 | |
b50d17a1 RK |
4216 | if (TREE_CODE (low_bound) != INTEGER_CST |
4217 | && contains_placeholder_p (low_bound)) | |
4218 | low_bound = build (WITH_RECORD_EXPR, sizetype, low_bound, exp); | |
4219 | ||
d4c89139 PB |
4220 | /* Optimize the special-case of a zero lower bound. |
4221 | ||
4222 | We convert the low_bound to sizetype to avoid some problems | |
4223 | with constant folding. (E.g. suppose the lower bound is 1, | |
4224 | and its mode is QI. Without the conversion, (ARRAY | |
4225 | +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1)) | |
4226 | +INDEX), which becomes (ARRAY+255+INDEX). Oops!) | |
4227 | ||
4228 | But sizetype isn't quite right either (especially if | |
4229 | the lowbound is negative). FIXME */ | |
4230 | ||
742920c7 | 4231 | if (! integer_zerop (low_bound)) |
d4c89139 PB |
4232 | index = fold (build (MINUS_EXPR, index_type, index, |
4233 | convert (sizetype, low_bound))); | |
742920c7 RK |
4234 | |
4235 | if (TREE_CODE (index) != INTEGER_CST | |
4236 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
4237 | { | |
4238 | /* Nonconstant array index or nonconstant element size. | |
4239 | Generate the tree for *(&array+index) and expand that, | |
4240 | except do it in a language-independent way | |
4241 | and don't complain about non-lvalue arrays. | |
4242 | `mark_addressable' should already have been called | |
4243 | for any array for which this case will be reached. */ | |
4244 | ||
4245 | /* Don't forget the const or volatile flag from the array | |
4246 | element. */ | |
4247 | tree variant_type = build_type_variant (type, | |
4248 | TREE_READONLY (exp), | |
4249 | TREE_THIS_VOLATILE (exp)); | |
4250 | tree array_adr = build1 (ADDR_EXPR, | |
4251 | build_pointer_type (variant_type), array); | |
4252 | tree elt; | |
b50d17a1 | 4253 | tree size = size_in_bytes (type); |
742920c7 RK |
4254 | |
4255 | /* Convert the integer argument to a type the same size as a | |
4256 | pointer so the multiply won't overflow spuriously. */ | |
4257 | if (TYPE_PRECISION (index_type) != POINTER_SIZE) | |
4258 | index = convert (type_for_size (POINTER_SIZE, 0), index); | |
4259 | ||
b50d17a1 RK |
4260 | if (TREE_CODE (size) != INTEGER_CST |
4261 | && contains_placeholder_p (size)) | |
4262 | size = build (WITH_RECORD_EXPR, sizetype, size, exp); | |
4263 | ||
742920c7 RK |
4264 | /* Don't think the address has side effects |
4265 | just because the array does. | |
4266 | (In some cases the address might have side effects, | |
4267 | and we fail to record that fact here. However, it should not | |
4268 | matter, since expand_expr should not care.) */ | |
4269 | TREE_SIDE_EFFECTS (array_adr) = 0; | |
4270 | ||
4271 | elt = build1 (INDIRECT_REF, type, | |
4272 | fold (build (PLUS_EXPR, | |
4273 | TYPE_POINTER_TO (variant_type), | |
4274 | array_adr, | |
4275 | fold (build (MULT_EXPR, | |
4276 | TYPE_POINTER_TO (variant_type), | |
b50d17a1 | 4277 | index, size))))); |
742920c7 RK |
4278 | |
4279 | /* Volatility, etc., of new expression is same as old | |
4280 | expression. */ | |
4281 | TREE_SIDE_EFFECTS (elt) = TREE_SIDE_EFFECTS (exp); | |
4282 | TREE_THIS_VOLATILE (elt) = TREE_THIS_VOLATILE (exp); | |
4283 | TREE_READONLY (elt) = TREE_READONLY (exp); | |
4284 | ||
4285 | return expand_expr (elt, target, tmode, modifier); | |
4286 | } | |
4287 | ||
4288 | /* Fold an expression like: "foo"[2]. | |
4289 | This is not done in fold so it won't happen inside &. */ | |
4290 | ||
4291 | if (TREE_CODE (array) == STRING_CST | |
4292 | && TREE_CODE (index) == INTEGER_CST | |
4293 | && !TREE_INT_CST_HIGH (index) | |
307b821c RK |
4294 | && (i = TREE_INT_CST_LOW (index)) < TREE_STRING_LENGTH (array) |
4295 | && GET_MODE_CLASS (mode) == MODE_INT) | |
4296 | return GEN_INT (TREE_STRING_POINTER (array)[i]); | |
bbf6f052 | 4297 | |
742920c7 RK |
4298 | /* If this is a constant index into a constant array, |
4299 | just get the value from the array. Handle both the cases when | |
4300 | we have an explicit constructor and when our operand is a variable | |
4301 | that was declared const. */ | |
4af3895e | 4302 | |
742920c7 RK |
4303 | if (TREE_CODE (array) == CONSTRUCTOR && ! TREE_SIDE_EFFECTS (array)) |
4304 | { | |
4305 | if (TREE_CODE (index) == INTEGER_CST | |
4306 | && TREE_INT_CST_HIGH (index) == 0) | |
4307 | { | |
4308 | tree elem = CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0)); | |
4309 | ||
4310 | i = TREE_INT_CST_LOW (index); | |
4311 | while (elem && i--) | |
4312 | elem = TREE_CHAIN (elem); | |
4313 | if (elem) | |
4314 | return expand_expr (fold (TREE_VALUE (elem)), target, | |
4315 | tmode, modifier); | |
4316 | } | |
4317 | } | |
4af3895e | 4318 | |
742920c7 RK |
4319 | else if (optimize >= 1 |
4320 | && TREE_READONLY (array) && ! TREE_SIDE_EFFECTS (array) | |
4321 | && TREE_CODE (array) == VAR_DECL && DECL_INITIAL (array) | |
4322 | && TREE_CODE (DECL_INITIAL (array)) != ERROR_MARK) | |
4323 | { | |
4324 | if (TREE_CODE (index) == INTEGER_CST | |
4325 | && TREE_INT_CST_HIGH (index) == 0) | |
4326 | { | |
4327 | tree init = DECL_INITIAL (array); | |
4328 | ||
4329 | i = TREE_INT_CST_LOW (index); | |
4330 | if (TREE_CODE (init) == CONSTRUCTOR) | |
4331 | { | |
4332 | tree elem = CONSTRUCTOR_ELTS (init); | |
4333 | ||
03dc44a6 RS |
4334 | while (elem |
4335 | && !tree_int_cst_equal (TREE_PURPOSE (elem), index)) | |
742920c7 RK |
4336 | elem = TREE_CHAIN (elem); |
4337 | if (elem) | |
4338 | return expand_expr (fold (TREE_VALUE (elem)), target, | |
4339 | tmode, modifier); | |
4340 | } | |
4341 | else if (TREE_CODE (init) == STRING_CST | |
4342 | && i < TREE_STRING_LENGTH (init)) | |
307b821c | 4343 | return GEN_INT (TREE_STRING_POINTER (init)[i]); |
742920c7 RK |
4344 | } |
4345 | } | |
4346 | } | |
8c8a8e34 | 4347 | |
bbf6f052 RK |
4348 | /* Treat array-ref with constant index as a component-ref. */ |
4349 | ||
4350 | case COMPONENT_REF: | |
4351 | case BIT_FIELD_REF: | |
4af3895e JVA |
4352 | /* If the operand is a CONSTRUCTOR, we can just extract the |
4353 | appropriate field if it is present. */ | |
4354 | if (code != ARRAY_REF | |
4355 | && TREE_CODE (TREE_OPERAND (exp, 0)) == CONSTRUCTOR) | |
4356 | { | |
4357 | tree elt; | |
4358 | ||
4359 | for (elt = CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0)); elt; | |
4360 | elt = TREE_CHAIN (elt)) | |
4361 | if (TREE_PURPOSE (elt) == TREE_OPERAND (exp, 1)) | |
4362 | return expand_expr (TREE_VALUE (elt), target, tmode, modifier); | |
4363 | } | |
4364 | ||
bbf6f052 RK |
4365 | { |
4366 | enum machine_mode mode1; | |
4367 | int bitsize; | |
4368 | int bitpos; | |
7bb0943f | 4369 | tree offset; |
bbf6f052 | 4370 | int volatilep = 0; |
7bb0943f | 4371 | tree tem = get_inner_reference (exp, &bitsize, &bitpos, &offset, |
bbf6f052 | 4372 | &mode1, &unsignedp, &volatilep); |
034f9101 | 4373 | int alignment; |
bbf6f052 | 4374 | |
e7f3c83f RK |
4375 | /* If we got back the original object, something is wrong. Perhaps |
4376 | we are evaluating an expression too early. In any event, don't | |
4377 | infinitely recurse. */ | |
4378 | if (tem == exp) | |
4379 | abort (); | |
4380 | ||
bbf6f052 RK |
4381 | /* In some cases, we will be offsetting OP0's address by a constant. |
4382 | So get it as a sum, if possible. If we will be using it | |
4383 | directly in an insn, we validate it. */ | |
906c4e36 | 4384 | op0 = expand_expr (tem, NULL_RTX, VOIDmode, EXPAND_SUM); |
bbf6f052 | 4385 | |
8c8a8e34 | 4386 | /* If this is a constant, put it into a register if it is a |
8008b228 | 4387 | legitimate constant and memory if it isn't. */ |
8c8a8e34 JW |
4388 | if (CONSTANT_P (op0)) |
4389 | { | |
4390 | enum machine_mode mode = TYPE_MODE (TREE_TYPE (tem)); | |
f2878c6b | 4391 | if (mode != BLKmode && LEGITIMATE_CONSTANT_P (op0)) |
8c8a8e34 JW |
4392 | op0 = force_reg (mode, op0); |
4393 | else | |
4394 | op0 = validize_mem (force_const_mem (mode, op0)); | |
4395 | } | |
4396 | ||
034f9101 | 4397 | alignment = TYPE_ALIGN (TREE_TYPE (tem)) / BITS_PER_UNIT; |
7bb0943f RS |
4398 | if (offset != 0) |
4399 | { | |
906c4e36 | 4400 | rtx offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, 0); |
7bb0943f RS |
4401 | |
4402 | if (GET_CODE (op0) != MEM) | |
4403 | abort (); | |
4404 | op0 = change_address (op0, VOIDmode, | |
4405 | gen_rtx (PLUS, Pmode, XEXP (op0, 0), | |
4406 | force_reg (Pmode, offset_rtx))); | |
034f9101 RS |
4407 | /* If we have a variable offset, the known alignment |
4408 | is only that of the innermost structure containing the field. | |
4409 | (Actually, we could sometimes do better by using the | |
4410 | size of an element of the innermost array, but no need.) */ | |
4411 | if (TREE_CODE (exp) == COMPONENT_REF | |
4412 | || TREE_CODE (exp) == BIT_FIELD_REF) | |
4413 | alignment = (TYPE_ALIGN (TREE_TYPE (TREE_OPERAND (exp, 0))) | |
4414 | / BITS_PER_UNIT); | |
7bb0943f RS |
4415 | } |
4416 | ||
bbf6f052 RK |
4417 | /* Don't forget about volatility even if this is a bitfield. */ |
4418 | if (GET_CODE (op0) == MEM && volatilep && ! MEM_VOLATILE_P (op0)) | |
4419 | { | |
4420 | op0 = copy_rtx (op0); | |
4421 | MEM_VOLATILE_P (op0) = 1; | |
4422 | } | |
4423 | ||
ccc98036 RS |
4424 | /* In cases where an aligned union has an unaligned object |
4425 | as a field, we might be extracting a BLKmode value from | |
4426 | an integer-mode (e.g., SImode) object. Handle this case | |
4427 | by doing the extract into an object as wide as the field | |
4428 | (which we know to be the width of a basic mode), then | |
4429 | storing into memory, and changing the mode to BLKmode. */ | |
bbf6f052 | 4430 | if (mode1 == VOIDmode |
0bba3f6f RK |
4431 | || (mode1 != BLKmode && ! direct_load[(int) mode1] |
4432 | && modifier != EXPAND_CONST_ADDRESS | |
4433 | && modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER) | |
ccc98036 RS |
4434 | || GET_CODE (op0) == REG || GET_CODE (op0) == SUBREG |
4435 | /* If the field isn't aligned enough to fetch as a memref, | |
4436 | fetch it as a bit field. */ | |
4437 | || (STRICT_ALIGNMENT | |
4438 | && TYPE_ALIGN (TREE_TYPE (tem)) < GET_MODE_ALIGNMENT (mode)) | |
4439 | || (STRICT_ALIGNMENT && bitpos % GET_MODE_ALIGNMENT (mode) != 0)) | |
bbf6f052 | 4440 | { |
bbf6f052 RK |
4441 | enum machine_mode ext_mode = mode; |
4442 | ||
4443 | if (ext_mode == BLKmode) | |
4444 | ext_mode = mode_for_size (bitsize, MODE_INT, 1); | |
4445 | ||
4446 | if (ext_mode == BLKmode) | |
4447 | abort (); | |
4448 | ||
4449 | op0 = extract_bit_field (validize_mem (op0), bitsize, bitpos, | |
4450 | unsignedp, target, ext_mode, ext_mode, | |
034f9101 | 4451 | alignment, |
bbf6f052 RK |
4452 | int_size_in_bytes (TREE_TYPE (tem))); |
4453 | if (mode == BLKmode) | |
4454 | { | |
4455 | rtx new = assign_stack_temp (ext_mode, | |
4456 | bitsize / BITS_PER_UNIT, 0); | |
4457 | ||
4458 | emit_move_insn (new, op0); | |
4459 | op0 = copy_rtx (new); | |
4460 | PUT_MODE (op0, BLKmode); | |
092dded9 | 4461 | MEM_IN_STRUCT_P (op0) = 1; |
bbf6f052 RK |
4462 | } |
4463 | ||
4464 | return op0; | |
4465 | } | |
4466 | ||
4467 | /* Get a reference to just this component. */ | |
4468 | if (modifier == EXPAND_CONST_ADDRESS | |
4469 | || modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER) | |
4470 | op0 = gen_rtx (MEM, mode1, plus_constant (XEXP (op0, 0), | |
4471 | (bitpos / BITS_PER_UNIT))); | |
4472 | else | |
4473 | op0 = change_address (op0, mode1, | |
4474 | plus_constant (XEXP (op0, 0), | |
4475 | (bitpos / BITS_PER_UNIT))); | |
4476 | MEM_IN_STRUCT_P (op0) = 1; | |
4477 | MEM_VOLATILE_P (op0) |= volatilep; | |
4478 | if (mode == mode1 || mode1 == BLKmode || mode1 == tmode) | |
4479 | return op0; | |
4480 | if (target == 0) | |
4481 | target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode); | |
4482 | convert_move (target, op0, unsignedp); | |
4483 | return target; | |
4484 | } | |
4485 | ||
4486 | case OFFSET_REF: | |
4487 | { | |
da120c2f | 4488 | tree base = build1 (ADDR_EXPR, type, TREE_OPERAND (exp, 0)); |
bbf6f052 | 4489 | tree addr = build (PLUS_EXPR, type, base, TREE_OPERAND (exp, 1)); |
906c4e36 | 4490 | op0 = expand_expr (addr, NULL_RTX, VOIDmode, EXPAND_SUM); |
bbf6f052 RK |
4491 | temp = gen_rtx (MEM, mode, memory_address (mode, op0)); |
4492 | MEM_IN_STRUCT_P (temp) = 1; | |
f94cc92f | 4493 | MEM_VOLATILE_P (temp) = TREE_THIS_VOLATILE (exp); |
89742723 | 4494 | #if 0 /* It is incorrect to set RTX_UNCHANGING_P here, because the fact that |
bbf6f052 RK |
4495 | a location is accessed through a pointer to const does not mean |
4496 | that the value there can never change. */ | |
4497 | RTX_UNCHANGING_P (temp) = TREE_READONLY (exp); | |
4498 | #endif | |
4499 | return temp; | |
4500 | } | |
4501 | ||
4502 | /* Intended for a reference to a buffer of a file-object in Pascal. | |
4503 | But it's not certain that a special tree code will really be | |
4504 | necessary for these. INDIRECT_REF might work for them. */ | |
4505 | case BUFFER_REF: | |
4506 | abort (); | |
4507 | ||
7308a047 | 4508 | case IN_EXPR: |
7308a047 | 4509 | { |
d6a5ac33 RK |
4510 | /* Pascal set IN expression. |
4511 | ||
4512 | Algorithm: | |
4513 | rlo = set_low - (set_low%bits_per_word); | |
4514 | the_word = set [ (index - rlo)/bits_per_word ]; | |
4515 | bit_index = index % bits_per_word; | |
4516 | bitmask = 1 << bit_index; | |
4517 | return !!(the_word & bitmask); */ | |
4518 | ||
7308a047 RS |
4519 | tree set = TREE_OPERAND (exp, 0); |
4520 | tree index = TREE_OPERAND (exp, 1); | |
d6a5ac33 | 4521 | int iunsignedp = TREE_UNSIGNED (TREE_TYPE (index)); |
7308a047 | 4522 | tree set_type = TREE_TYPE (set); |
7308a047 RS |
4523 | tree set_low_bound = TYPE_MIN_VALUE (TYPE_DOMAIN (set_type)); |
4524 | tree set_high_bound = TYPE_MAX_VALUE (TYPE_DOMAIN (set_type)); | |
d6a5ac33 RK |
4525 | rtx index_val = expand_expr (index, 0, VOIDmode, 0); |
4526 | rtx lo_r = expand_expr (set_low_bound, 0, VOIDmode, 0); | |
4527 | rtx hi_r = expand_expr (set_high_bound, 0, VOIDmode, 0); | |
4528 | rtx setval = expand_expr (set, 0, VOIDmode, 0); | |
4529 | rtx setaddr = XEXP (setval, 0); | |
4530 | enum machine_mode index_mode = TYPE_MODE (TREE_TYPE (index)); | |
7308a047 RS |
4531 | rtx rlow; |
4532 | rtx diff, quo, rem, addr, bit, result; | |
7308a047 | 4533 | |
d6a5ac33 RK |
4534 | preexpand_calls (exp); |
4535 | ||
4536 | /* If domain is empty, answer is no. Likewise if index is constant | |
4537 | and out of bounds. */ | |
4538 | if ((TREE_CODE (set_high_bound) == INTEGER_CST | |
4539 | && TREE_CODE (set_low_bound) == INTEGER_CST | |
4540 | && tree_int_cst_lt (set_high_bound, set_low_bound) | |
4541 | || (TREE_CODE (index) == INTEGER_CST | |
4542 | && TREE_CODE (set_low_bound) == INTEGER_CST | |
4543 | && tree_int_cst_lt (index, set_low_bound)) | |
4544 | || (TREE_CODE (set_high_bound) == INTEGER_CST | |
4545 | && TREE_CODE (index) == INTEGER_CST | |
4546 | && tree_int_cst_lt (set_high_bound, index)))) | |
7308a047 RS |
4547 | return const0_rtx; |
4548 | ||
d6a5ac33 RK |
4549 | if (target == 0) |
4550 | target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode); | |
7308a047 RS |
4551 | |
4552 | /* If we get here, we have to generate the code for both cases | |
4553 | (in range and out of range). */ | |
4554 | ||
4555 | op0 = gen_label_rtx (); | |
4556 | op1 = gen_label_rtx (); | |
4557 | ||
4558 | if (! (GET_CODE (index_val) == CONST_INT | |
4559 | && GET_CODE (lo_r) == CONST_INT)) | |
4560 | { | |
17938e57 | 4561 | emit_cmp_insn (index_val, lo_r, LT, NULL_RTX, |
d6a5ac33 | 4562 | GET_MODE (index_val), iunsignedp, 0); |
7308a047 RS |
4563 | emit_jump_insn (gen_blt (op1)); |
4564 | } | |
4565 | ||
4566 | if (! (GET_CODE (index_val) == CONST_INT | |
4567 | && GET_CODE (hi_r) == CONST_INT)) | |
4568 | { | |
17938e57 | 4569 | emit_cmp_insn (index_val, hi_r, GT, NULL_RTX, |
d6a5ac33 | 4570 | GET_MODE (index_val), iunsignedp, 0); |
7308a047 RS |
4571 | emit_jump_insn (gen_bgt (op1)); |
4572 | } | |
4573 | ||
4574 | /* Calculate the element number of bit zero in the first word | |
4575 | of the set. */ | |
4576 | if (GET_CODE (lo_r) == CONST_INT) | |
17938e57 RK |
4577 | rlow = GEN_INT (INTVAL (lo_r) |
4578 | & ~ ((HOST_WIDE_INT) 1 << BITS_PER_UNIT)); | |
7308a047 | 4579 | else |
17938e57 RK |
4580 | rlow = expand_binop (index_mode, and_optab, lo_r, |
4581 | GEN_INT (~((HOST_WIDE_INT) 1 << BITS_PER_UNIT)), | |
d6a5ac33 | 4582 | NULL_RTX, iunsignedp, OPTAB_LIB_WIDEN); |
7308a047 | 4583 | |
d6a5ac33 RK |
4584 | diff = expand_binop (index_mode, sub_optab, index_val, rlow, |
4585 | NULL_RTX, iunsignedp, OPTAB_LIB_WIDEN); | |
7308a047 RS |
4586 | |
4587 | quo = expand_divmod (0, TRUNC_DIV_EXPR, index_mode, diff, | |
d6a5ac33 | 4588 | GEN_INT (BITS_PER_UNIT), NULL_RTX, iunsignedp); |
7308a047 | 4589 | rem = expand_divmod (1, TRUNC_MOD_EXPR, index_mode, index_val, |
d6a5ac33 RK |
4590 | GEN_INT (BITS_PER_UNIT), NULL_RTX, iunsignedp); |
4591 | ||
7308a047 | 4592 | addr = memory_address (byte_mode, |
d6a5ac33 RK |
4593 | expand_binop (index_mode, add_optab, diff, |
4594 | setaddr, NULL_RTX, iunsignedp, | |
17938e57 | 4595 | OPTAB_LIB_WIDEN)); |
d6a5ac33 | 4596 | |
7308a047 RS |
4597 | /* Extract the bit we want to examine */ |
4598 | bit = expand_shift (RSHIFT_EXPR, byte_mode, | |
17938e57 RK |
4599 | gen_rtx (MEM, byte_mode, addr), |
4600 | make_tree (TREE_TYPE (index), rem), | |
4601 | NULL_RTX, 1); | |
4602 | result = expand_binop (byte_mode, and_optab, bit, const1_rtx, | |
4603 | GET_MODE (target) == byte_mode ? target : 0, | |
7308a047 | 4604 | 1, OPTAB_LIB_WIDEN); |
17938e57 RK |
4605 | |
4606 | if (result != target) | |
4607 | convert_move (target, result, 1); | |
7308a047 RS |
4608 | |
4609 | /* Output the code to handle the out-of-range case. */ | |
4610 | emit_jump (op0); | |
4611 | emit_label (op1); | |
4612 | emit_move_insn (target, const0_rtx); | |
4613 | emit_label (op0); | |
4614 | return target; | |
4615 | } | |
4616 | ||
bbf6f052 RK |
4617 | case WITH_CLEANUP_EXPR: |
4618 | if (RTL_EXPR_RTL (exp) == 0) | |
4619 | { | |
4620 | RTL_EXPR_RTL (exp) | |
e287fd6e RK |
4621 | = expand_expr (TREE_OPERAND (exp, 0), |
4622 | target ? target : const0_rtx, | |
4623 | tmode, modifier); | |
906c4e36 RK |
4624 | cleanups_this_call |
4625 | = tree_cons (NULL_TREE, TREE_OPERAND (exp, 2), cleanups_this_call); | |
bbf6f052 RK |
4626 | /* That's it for this cleanup. */ |
4627 | TREE_OPERAND (exp, 2) = 0; | |
4628 | } | |
4629 | return RTL_EXPR_RTL (exp); | |
4630 | ||
4631 | case CALL_EXPR: | |
4632 | /* Check for a built-in function. */ | |
4633 | if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR | |
d6a5ac33 RK |
4634 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) |
4635 | == FUNCTION_DECL) | |
bbf6f052 RK |
4636 | && DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))) |
4637 | return expand_builtin (exp, target, subtarget, tmode, ignore); | |
d6a5ac33 | 4638 | |
bbf6f052 RK |
4639 | /* If this call was expanded already by preexpand_calls, |
4640 | just return the result we got. */ | |
4641 | if (CALL_EXPR_RTL (exp) != 0) | |
4642 | return CALL_EXPR_RTL (exp); | |
d6a5ac33 | 4643 | |
8129842c | 4644 | return expand_call (exp, target, ignore); |
bbf6f052 RK |
4645 | |
4646 | case NON_LVALUE_EXPR: | |
4647 | case NOP_EXPR: | |
4648 | case CONVERT_EXPR: | |
4649 | case REFERENCE_EXPR: | |
bbf6f052 RK |
4650 | if (mode == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))) |
4651 | return expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode, modifier); | |
d6a5ac33 | 4652 | |
bbf6f052 RK |
4653 | if (TREE_CODE (type) == UNION_TYPE) |
4654 | { | |
4655 | tree valtype = TREE_TYPE (TREE_OPERAND (exp, 0)); | |
4656 | if (target == 0) | |
4657 | { | |
4658 | if (mode == BLKmode) | |
4659 | { | |
4660 | if (TYPE_SIZE (type) == 0 | |
4661 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
4662 | abort (); | |
4663 | target = assign_stack_temp (BLKmode, | |
4664 | (TREE_INT_CST_LOW (TYPE_SIZE (type)) | |
4665 | + BITS_PER_UNIT - 1) | |
4666 | / BITS_PER_UNIT, 0); | |
4667 | } | |
4668 | else | |
d6a5ac33 | 4669 | target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode); |
bbf6f052 | 4670 | } |
d6a5ac33 | 4671 | |
bbf6f052 RK |
4672 | if (GET_CODE (target) == MEM) |
4673 | /* Store data into beginning of memory target. */ | |
4674 | store_expr (TREE_OPERAND (exp, 0), | |
1499e0a8 RK |
4675 | change_address (target, TYPE_MODE (valtype), 0), 0); |
4676 | ||
bbf6f052 RK |
4677 | else if (GET_CODE (target) == REG) |
4678 | /* Store this field into a union of the proper type. */ | |
4679 | store_field (target, GET_MODE_BITSIZE (TYPE_MODE (valtype)), 0, | |
4680 | TYPE_MODE (valtype), TREE_OPERAND (exp, 0), | |
4681 | VOIDmode, 0, 1, | |
4682 | int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)))); | |
4683 | else | |
4684 | abort (); | |
4685 | ||
4686 | /* Return the entire union. */ | |
4687 | return target; | |
4688 | } | |
d6a5ac33 | 4689 | |
1499e0a8 | 4690 | op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, mode, 0); |
12342f90 RS |
4691 | if (GET_MODE (op0) == mode) |
4692 | return op0; | |
12342f90 | 4693 | |
d6a5ac33 RK |
4694 | /* If OP0 is a constant, just convert it into the proper mode. */ |
4695 | if (CONSTANT_P (op0)) | |
4696 | return | |
4697 | convert_modes (mode, TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))), | |
4698 | op0, TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0)))); | |
12342f90 | 4699 | |
26fcb35a RS |
4700 | if (modifier == EXPAND_INITIALIZER) |
4701 | return gen_rtx (unsignedp ? ZERO_EXTEND : SIGN_EXTEND, mode, op0); | |
d6a5ac33 | 4702 | |
bbf6f052 RK |
4703 | if (flag_force_mem && GET_CODE (op0) == MEM) |
4704 | op0 = copy_to_reg (op0); | |
4705 | ||
4706 | if (target == 0) | |
d6a5ac33 RK |
4707 | return |
4708 | convert_to_mode (mode, op0, | |
4709 | TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0)))); | |
bbf6f052 | 4710 | else |
d6a5ac33 RK |
4711 | convert_move (target, op0, |
4712 | TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0)))); | |
bbf6f052 RK |
4713 | return target; |
4714 | ||
4715 | case PLUS_EXPR: | |
4716 | /* We come here from MINUS_EXPR when the second operand is a constant. */ | |
4717 | plus_expr: | |
4718 | this_optab = add_optab; | |
4719 | ||
4720 | /* If we are adding a constant, an RTL_EXPR that is sp, fp, or ap, and | |
4721 | something else, make sure we add the register to the constant and | |
4722 | then to the other thing. This case can occur during strength | |
4723 | reduction and doing it this way will produce better code if the | |
4724 | frame pointer or argument pointer is eliminated. | |
4725 | ||
4726 | fold-const.c will ensure that the constant is always in the inner | |
4727 | PLUS_EXPR, so the only case we need to do anything about is if | |
4728 | sp, ap, or fp is our second argument, in which case we must swap | |
4729 | the innermost first argument and our second argument. */ | |
4730 | ||
4731 | if (TREE_CODE (TREE_OPERAND (exp, 0)) == PLUS_EXPR | |
4732 | && TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 1)) == INTEGER_CST | |
4733 | && TREE_CODE (TREE_OPERAND (exp, 1)) == RTL_EXPR | |
4734 | && (RTL_EXPR_RTL (TREE_OPERAND (exp, 1)) == frame_pointer_rtx | |
4735 | || RTL_EXPR_RTL (TREE_OPERAND (exp, 1)) == stack_pointer_rtx | |
4736 | || RTL_EXPR_RTL (TREE_OPERAND (exp, 1)) == arg_pointer_rtx)) | |
4737 | { | |
4738 | tree t = TREE_OPERAND (exp, 1); | |
4739 | ||
4740 | TREE_OPERAND (exp, 1) = TREE_OPERAND (TREE_OPERAND (exp, 0), 0); | |
4741 | TREE_OPERAND (TREE_OPERAND (exp, 0), 0) = t; | |
4742 | } | |
4743 | ||
4744 | /* If the result is to be Pmode and we are adding an integer to | |
4745 | something, we might be forming a constant. So try to use | |
4746 | plus_constant. If it produces a sum and we can't accept it, | |
4747 | use force_operand. This allows P = &ARR[const] to generate | |
4748 | efficient code on machines where a SYMBOL_REF is not a valid | |
4749 | address. | |
4750 | ||
4751 | If this is an EXPAND_SUM call, always return the sum. */ | |
c980ac49 RS |
4752 | if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER |
4753 | || mode == Pmode) | |
bbf6f052 | 4754 | { |
c980ac49 RS |
4755 | if (TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST |
4756 | && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT | |
4757 | && TREE_CONSTANT (TREE_OPERAND (exp, 1))) | |
4758 | { | |
4759 | op1 = expand_expr (TREE_OPERAND (exp, 1), subtarget, VOIDmode, | |
4760 | EXPAND_SUM); | |
4761 | op1 = plus_constant (op1, TREE_INT_CST_LOW (TREE_OPERAND (exp, 0))); | |
4762 | if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER) | |
4763 | op1 = force_operand (op1, target); | |
4764 | return op1; | |
4765 | } | |
bbf6f052 | 4766 | |
c980ac49 RS |
4767 | else if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST |
4768 | && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_INT | |
4769 | && TREE_CONSTANT (TREE_OPERAND (exp, 0))) | |
4770 | { | |
4771 | op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, | |
4772 | EXPAND_SUM); | |
4773 | if (! CONSTANT_P (op0)) | |
4774 | { | |
4775 | op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, | |
4776 | VOIDmode, modifier); | |
709f5be1 RS |
4777 | /* Don't go to both_summands if modifier |
4778 | says it's not right to return a PLUS. */ | |
4779 | if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER) | |
4780 | goto binop2; | |
c980ac49 RS |
4781 | goto both_summands; |
4782 | } | |
4783 | op0 = plus_constant (op0, TREE_INT_CST_LOW (TREE_OPERAND (exp, 1))); | |
4784 | if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER) | |
4785 | op0 = force_operand (op0, target); | |
4786 | return op0; | |
4787 | } | |
bbf6f052 RK |
4788 | } |
4789 | ||
4790 | /* No sense saving up arithmetic to be done | |
4791 | if it's all in the wrong mode to form part of an address. | |
4792 | And force_operand won't know whether to sign-extend or | |
4793 | zero-extend. */ | |
4794 | if ((modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER) | |
c980ac49 RS |
4795 | || mode != Pmode) |
4796 | goto binop; | |
bbf6f052 RK |
4797 | |
4798 | preexpand_calls (exp); | |
4799 | if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1))) | |
4800 | subtarget = 0; | |
4801 | ||
4802 | op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, modifier); | |
906c4e36 | 4803 | op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, modifier); |
bbf6f052 | 4804 | |
c980ac49 | 4805 | both_summands: |
bbf6f052 RK |
4806 | /* Make sure any term that's a sum with a constant comes last. */ |
4807 | if (GET_CODE (op0) == PLUS | |
4808 | && CONSTANT_P (XEXP (op0, 1))) | |
4809 | { | |
4810 | temp = op0; | |
4811 | op0 = op1; | |
4812 | op1 = temp; | |
4813 | } | |
4814 | /* If adding to a sum including a constant, | |
4815 | associate it to put the constant outside. */ | |
4816 | if (GET_CODE (op1) == PLUS | |
4817 | && CONSTANT_P (XEXP (op1, 1))) | |
4818 | { | |
4819 | rtx constant_term = const0_rtx; | |
4820 | ||
4821 | temp = simplify_binary_operation (PLUS, mode, XEXP (op1, 0), op0); | |
4822 | if (temp != 0) | |
4823 | op0 = temp; | |
6f90e075 JW |
4824 | /* Ensure that MULT comes first if there is one. */ |
4825 | else if (GET_CODE (op0) == MULT) | |
4826 | op0 = gen_rtx (PLUS, mode, op0, XEXP (op1, 0)); | |
bbf6f052 RK |
4827 | else |
4828 | op0 = gen_rtx (PLUS, mode, XEXP (op1, 0), op0); | |
4829 | ||
4830 | /* Let's also eliminate constants from op0 if possible. */ | |
4831 | op0 = eliminate_constant_term (op0, &constant_term); | |
4832 | ||
4833 | /* CONSTANT_TERM and XEXP (op1, 1) are known to be constant, so | |
4834 | their sum should be a constant. Form it into OP1, since the | |
4835 | result we want will then be OP0 + OP1. */ | |
4836 | ||
4837 | temp = simplify_binary_operation (PLUS, mode, constant_term, | |
4838 | XEXP (op1, 1)); | |
4839 | if (temp != 0) | |
4840 | op1 = temp; | |
4841 | else | |
4842 | op1 = gen_rtx (PLUS, mode, constant_term, XEXP (op1, 1)); | |
4843 | } | |
4844 | ||
4845 | /* Put a constant term last and put a multiplication first. */ | |
4846 | if (CONSTANT_P (op0) || GET_CODE (op1) == MULT) | |
4847 | temp = op1, op1 = op0, op0 = temp; | |
4848 | ||
4849 | temp = simplify_binary_operation (PLUS, mode, op0, op1); | |
4850 | return temp ? temp : gen_rtx (PLUS, mode, op0, op1); | |
4851 | ||
4852 | case MINUS_EXPR: | |
ea87523e RK |
4853 | /* For initializers, we are allowed to return a MINUS of two |
4854 | symbolic constants. Here we handle all cases when both operands | |
4855 | are constant. */ | |
bbf6f052 RK |
4856 | /* Handle difference of two symbolic constants, |
4857 | for the sake of an initializer. */ | |
4858 | if ((modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER) | |
4859 | && really_constant_p (TREE_OPERAND (exp, 0)) | |
4860 | && really_constant_p (TREE_OPERAND (exp, 1))) | |
4861 | { | |
906c4e36 RK |
4862 | rtx op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, |
4863 | VOIDmode, modifier); | |
4864 | rtx op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, | |
4865 | VOIDmode, modifier); | |
ea87523e RK |
4866 | |
4867 | /* If one operand is a CONST_INT, put it last. */ | |
4868 | if (GET_CODE (op0) == CONST_INT) | |
4869 | temp = op0, op0 = op1, op1 = temp; | |
4870 | ||
4871 | /* If the last operand is a CONST_INT, use plus_constant of | |
4872 | the negated constant. Else make the MINUS. */ | |
4873 | if (GET_CODE (op1) == CONST_INT) | |
4874 | return plus_constant (op0, - INTVAL (op1)); | |
4875 | else | |
4876 | return gen_rtx (MINUS, mode, op0, op1); | |
bbf6f052 RK |
4877 | } |
4878 | /* Convert A - const to A + (-const). */ | |
4879 | if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST) | |
4880 | { | |
4881 | exp = build (PLUS_EXPR, type, TREE_OPERAND (exp, 0), | |
4882 | fold (build1 (NEGATE_EXPR, type, | |
4883 | TREE_OPERAND (exp, 1)))); | |
4884 | goto plus_expr; | |
4885 | } | |
4886 | this_optab = sub_optab; | |
4887 | goto binop; | |
4888 | ||
4889 | case MULT_EXPR: | |
4890 | preexpand_calls (exp); | |
4891 | /* If first operand is constant, swap them. | |
4892 | Thus the following special case checks need only | |
4893 | check the second operand. */ | |
4894 | if (TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST) | |
4895 | { | |
4896 | register tree t1 = TREE_OPERAND (exp, 0); | |
4897 | TREE_OPERAND (exp, 0) = TREE_OPERAND (exp, 1); | |
4898 | TREE_OPERAND (exp, 1) = t1; | |
4899 | } | |
4900 | ||
4901 | /* Attempt to return something suitable for generating an | |
4902 | indexed address, for machines that support that. */ | |
4903 | ||
4904 | if (modifier == EXPAND_SUM && mode == Pmode | |
4905 | && TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST | |
906c4e36 | 4906 | && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT) |
bbf6f052 RK |
4907 | { |
4908 | op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, EXPAND_SUM); | |
4909 | ||
4910 | /* Apply distributive law if OP0 is x+c. */ | |
4911 | if (GET_CODE (op0) == PLUS | |
4912 | && GET_CODE (XEXP (op0, 1)) == CONST_INT) | |
4913 | return gen_rtx (PLUS, mode, | |
4914 | gen_rtx (MULT, mode, XEXP (op0, 0), | |
906c4e36 RK |
4915 | GEN_INT (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)))), |
4916 | GEN_INT (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)) | |
4917 | * INTVAL (XEXP (op0, 1)))); | |
bbf6f052 RK |
4918 | |
4919 | if (GET_CODE (op0) != REG) | |
906c4e36 | 4920 | op0 = force_operand (op0, NULL_RTX); |
bbf6f052 RK |
4921 | if (GET_CODE (op0) != REG) |
4922 | op0 = copy_to_mode_reg (mode, op0); | |
4923 | ||
4924 | return gen_rtx (MULT, mode, op0, | |
906c4e36 | 4925 | GEN_INT (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)))); |
bbf6f052 RK |
4926 | } |
4927 | ||
4928 | if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1))) | |
4929 | subtarget = 0; | |
4930 | ||
4931 | /* Check for multiplying things that have been extended | |
4932 | from a narrower type. If this machine supports multiplying | |
4933 | in that narrower type with a result in the desired type, | |
4934 | do it that way, and avoid the explicit type-conversion. */ | |
4935 | if (TREE_CODE (TREE_OPERAND (exp, 0)) == NOP_EXPR | |
4936 | && TREE_CODE (type) == INTEGER_TYPE | |
4937 | && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))) | |
4938 | < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp, 0)))) | |
4939 | && ((TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST | |
4940 | && int_fits_type_p (TREE_OPERAND (exp, 1), | |
4941 | TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))) | |
4942 | /* Don't use a widening multiply if a shift will do. */ | |
4943 | && ((GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 1)))) | |
906c4e36 | 4944 | > HOST_BITS_PER_WIDE_INT) |
bbf6f052 RK |
4945 | || exact_log2 (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1))) < 0)) |
4946 | || | |
4947 | (TREE_CODE (TREE_OPERAND (exp, 1)) == NOP_EXPR | |
4948 | && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 1), 0))) | |
4949 | == | |
4950 | TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))) | |
4951 | /* If both operands are extended, they must either both | |
4952 | be zero-extended or both be sign-extended. */ | |
4953 | && (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 1), 0))) | |
4954 | == | |
4955 | TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))))))) | |
4956 | { | |
4957 | enum machine_mode innermode | |
4958 | = TYPE_MODE (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))); | |
4959 | this_optab = (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))) | |
4960 | ? umul_widen_optab : smul_widen_optab); | |
4961 | if (mode == GET_MODE_WIDER_MODE (innermode) | |
4962 | && this_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing) | |
4963 | { | |
4964 | op0 = expand_expr (TREE_OPERAND (TREE_OPERAND (exp, 0), 0), | |
906c4e36 | 4965 | NULL_RTX, VOIDmode, 0); |
bbf6f052 | 4966 | if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST) |
906c4e36 RK |
4967 | op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, |
4968 | VOIDmode, 0); | |
bbf6f052 RK |
4969 | else |
4970 | op1 = expand_expr (TREE_OPERAND (TREE_OPERAND (exp, 1), 0), | |
906c4e36 | 4971 | NULL_RTX, VOIDmode, 0); |
bbf6f052 RK |
4972 | goto binop2; |
4973 | } | |
4974 | } | |
4975 | op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0); | |
906c4e36 | 4976 | op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0); |
bbf6f052 RK |
4977 | return expand_mult (mode, op0, op1, target, unsignedp); |
4978 | ||
4979 | case TRUNC_DIV_EXPR: | |
4980 | case FLOOR_DIV_EXPR: | |
4981 | case CEIL_DIV_EXPR: | |
4982 | case ROUND_DIV_EXPR: | |
4983 | case EXACT_DIV_EXPR: | |
4984 | preexpand_calls (exp); | |
4985 | if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1))) | |
4986 | subtarget = 0; | |
4987 | /* Possible optimization: compute the dividend with EXPAND_SUM | |
4988 | then if the divisor is constant can optimize the case | |
4989 | where some terms of the dividend have coeffs divisible by it. */ | |
4990 | op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0); | |
906c4e36 | 4991 | op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0); |
bbf6f052 RK |
4992 | return expand_divmod (0, code, mode, op0, op1, target, unsignedp); |
4993 | ||
4994 | case RDIV_EXPR: | |
4995 | this_optab = flodiv_optab; | |
4996 | goto binop; | |
4997 | ||
4998 | case TRUNC_MOD_EXPR: | |
4999 | case FLOOR_MOD_EXPR: | |
5000 | case CEIL_MOD_EXPR: | |
5001 | case ROUND_MOD_EXPR: | |
5002 | preexpand_calls (exp); | |
5003 | if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1))) | |
5004 | subtarget = 0; | |
5005 | op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0); | |
906c4e36 | 5006 | op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0); |
bbf6f052 RK |
5007 | return expand_divmod (1, code, mode, op0, op1, target, unsignedp); |
5008 | ||
5009 | case FIX_ROUND_EXPR: | |
5010 | case FIX_FLOOR_EXPR: | |
5011 | case FIX_CEIL_EXPR: | |
5012 | abort (); /* Not used for C. */ | |
5013 | ||
5014 | case FIX_TRUNC_EXPR: | |
906c4e36 | 5015 | op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0); |
bbf6f052 RK |
5016 | if (target == 0) |
5017 | target = gen_reg_rtx (mode); | |
5018 | expand_fix (target, op0, unsignedp); | |
5019 | return target; | |
5020 | ||
5021 | case FLOAT_EXPR: | |
906c4e36 | 5022 | op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0); |
bbf6f052 RK |
5023 | if (target == 0) |
5024 | target = gen_reg_rtx (mode); | |
5025 | /* expand_float can't figure out what to do if FROM has VOIDmode. | |
5026 | So give it the correct mode. With -O, cse will optimize this. */ | |
5027 | if (GET_MODE (op0) == VOIDmode) | |
5028 | op0 = copy_to_mode_reg (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))), | |
5029 | op0); | |
5030 | expand_float (target, op0, | |
5031 | TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0)))); | |
5032 | return target; | |
5033 | ||
5034 | case NEGATE_EXPR: | |
5b22bee8 | 5035 | op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0); |
bbf6f052 RK |
5036 | temp = expand_unop (mode, neg_optab, op0, target, 0); |
5037 | if (temp == 0) | |
5038 | abort (); | |
5039 | return temp; | |
5040 | ||
5041 | case ABS_EXPR: | |
5042 | op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0); | |
5043 | ||
2d7050fd | 5044 | /* Handle complex values specially. */ |
d6a5ac33 RK |
5045 | if (GET_MODE_CLASS (mode) == MODE_COMPLEX_INT |
5046 | || GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT) | |
5047 | return expand_complex_abs (mode, op0, target, unsignedp); | |
2d7050fd | 5048 | |
bbf6f052 RK |
5049 | /* Unsigned abs is simply the operand. Testing here means we don't |
5050 | risk generating incorrect code below. */ | |
5051 | if (TREE_UNSIGNED (type)) | |
5052 | return op0; | |
5053 | ||
5054 | /* First try to do it with a special abs instruction. */ | |
5055 | temp = expand_unop (mode, abs_optab, op0, target, 0); | |
5056 | if (temp != 0) | |
5057 | return temp; | |
5058 | ||
5059 | /* If this machine has expensive jumps, we can do integer absolute | |
5060 | value of X as (((signed) x >> (W-1)) ^ x) - ((signed) x >> (W-1)), | |
5061 | where W is the width of MODE. */ | |
5062 | ||
5063 | if (GET_MODE_CLASS (mode) == MODE_INT && BRANCH_COST >= 2) | |
5064 | { | |
5065 | rtx extended = expand_shift (RSHIFT_EXPR, mode, op0, | |
5066 | size_int (GET_MODE_BITSIZE (mode) - 1), | |
906c4e36 | 5067 | NULL_RTX, 0); |
bbf6f052 RK |
5068 | |
5069 | temp = expand_binop (mode, xor_optab, extended, op0, target, 0, | |
5070 | OPTAB_LIB_WIDEN); | |
5071 | if (temp != 0) | |
5072 | temp = expand_binop (mode, sub_optab, temp, extended, target, 0, | |
5073 | OPTAB_LIB_WIDEN); | |
5074 | ||
5075 | if (temp != 0) | |
5076 | return temp; | |
5077 | } | |
5078 | ||
5079 | /* If that does not win, use conditional jump and negate. */ | |
5080 | target = original_target; | |
d6a5ac33 | 5081 | op1 = gen_label_rtx (); |
bbf6f052 | 5082 | if (target == 0 || ! safe_from_p (target, TREE_OPERAND (exp, 0)) |
d6a5ac33 | 5083 | || GET_MODE (target) != mode |
37568125 | 5084 | || (GET_CODE (target) == MEM && MEM_VOLATILE_P (target)) |
bbf6f052 RK |
5085 | || (GET_CODE (target) == REG |
5086 | && REGNO (target) < FIRST_PSEUDO_REGISTER)) | |
5087 | target = gen_reg_rtx (mode); | |
d6a5ac33 | 5088 | |
bbf6f052 | 5089 | emit_move_insn (target, op0); |
bbf6f052 | 5090 | NO_DEFER_POP; |
d6a5ac33 RK |
5091 | |
5092 | /* If this mode is an integer too wide to compare properly, | |
5093 | compare word by word. Rely on CSE to optimize constant cases. */ | |
5094 | if (GET_MODE_CLASS (mode) == MODE_INT && ! can_compare_p (mode)) | |
5095 | do_jump_by_parts_greater_rtx (mode, 0, target, const0_rtx, | |
5096 | NULL_RTX, op1); | |
5097 | else | |
5098 | { | |
5099 | temp = compare_from_rtx (target, const0_rtx, GE, 0, mode, | |
5100 | NULL_RTX, 0); | |
5101 | if (temp == const1_rtx) | |
5102 | return target; | |
5103 | else if (temp != const0_rtx) | |
5104 | { | |
5105 | if (bcc_gen_fctn[(int) GET_CODE (temp)] != 0) | |
eedd251f | 5106 | emit_jump_insn ((*bcc_gen_fctn[(int) GET_CODE (temp)]) (op1)); |
d6a5ac33 RK |
5107 | else |
5108 | abort (); | |
5109 | } | |
5110 | } | |
5111 | ||
bbf6f052 RK |
5112 | op0 = expand_unop (mode, neg_optab, target, target, 0); |
5113 | if (op0 != target) | |
5114 | emit_move_insn (target, op0); | |
d6a5ac33 | 5115 | emit_label (op1); |
bbf6f052 RK |
5116 | OK_DEFER_POP; |
5117 | return target; | |
5118 | ||
5119 | case MAX_EXPR: | |
5120 | case MIN_EXPR: | |
5121 | target = original_target; | |
5122 | if (target == 0 || ! safe_from_p (target, TREE_OPERAND (exp, 1)) | |
fc155707 | 5123 | || (GET_CODE (target) == MEM && MEM_VOLATILE_P (target)) |
d6a5ac33 | 5124 | || GET_MODE (target) != mode |
bbf6f052 RK |
5125 | || (GET_CODE (target) == REG |
5126 | && REGNO (target) < FIRST_PSEUDO_REGISTER)) | |
5127 | target = gen_reg_rtx (mode); | |
906c4e36 | 5128 | op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0); |
bbf6f052 RK |
5129 | op0 = expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode, 0); |
5130 | ||
5131 | /* First try to do it with a special MIN or MAX instruction. | |
5132 | If that does not win, use a conditional jump to select the proper | |
5133 | value. */ | |
5134 | this_optab = (TREE_UNSIGNED (type) | |
5135 | ? (code == MIN_EXPR ? umin_optab : umax_optab) | |
5136 | : (code == MIN_EXPR ? smin_optab : smax_optab)); | |
5137 | ||
5138 | temp = expand_binop (mode, this_optab, op0, op1, target, unsignedp, | |
5139 | OPTAB_WIDEN); | |
5140 | if (temp != 0) | |
5141 | return temp; | |
5142 | ||
ee456b1c RK |
5143 | if (target != op0) |
5144 | emit_move_insn (target, op0); | |
d6a5ac33 | 5145 | |
bbf6f052 | 5146 | op0 = gen_label_rtx (); |
d6a5ac33 | 5147 | |
f81497d9 RS |
5148 | /* If this mode is an integer too wide to compare properly, |
5149 | compare word by word. Rely on cse to optimize constant cases. */ | |
d6a5ac33 | 5150 | if (GET_MODE_CLASS (mode) == MODE_INT && !can_compare_p (mode)) |
bbf6f052 | 5151 | { |
f81497d9 | 5152 | if (code == MAX_EXPR) |
d6a5ac33 RK |
5153 | do_jump_by_parts_greater_rtx (mode, TREE_UNSIGNED (type), |
5154 | target, op1, NULL_RTX, op0); | |
bbf6f052 | 5155 | else |
d6a5ac33 RK |
5156 | do_jump_by_parts_greater_rtx (mode, TREE_UNSIGNED (type), |
5157 | op1, target, NULL_RTX, op0); | |
ee456b1c | 5158 | emit_move_insn (target, op1); |
bbf6f052 | 5159 | } |
f81497d9 RS |
5160 | else |
5161 | { | |
5162 | if (code == MAX_EXPR) | |
5163 | temp = (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 1))) | |
ee456b1c RK |
5164 | ? compare_from_rtx (target, op1, GEU, 1, mode, NULL_RTX, 0) |
5165 | : compare_from_rtx (target, op1, GE, 0, mode, NULL_RTX, 0)); | |
f81497d9 RS |
5166 | else |
5167 | temp = (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 1))) | |
ee456b1c RK |
5168 | ? compare_from_rtx (target, op1, LEU, 1, mode, NULL_RTX, 0) |
5169 | : compare_from_rtx (target, op1, LE, 0, mode, NULL_RTX, 0)); | |
f81497d9 | 5170 | if (temp == const0_rtx) |
ee456b1c | 5171 | emit_move_insn (target, op1); |
f81497d9 RS |
5172 | else if (temp != const_true_rtx) |
5173 | { | |
5174 | if (bcc_gen_fctn[(int) GET_CODE (temp)] != 0) | |
5175 | emit_jump_insn ((*bcc_gen_fctn[(int) GET_CODE (temp)]) (op0)); | |
5176 | else | |
5177 | abort (); | |
ee456b1c | 5178 | emit_move_insn (target, op1); |
f81497d9 RS |
5179 | } |
5180 | } | |
bbf6f052 RK |
5181 | emit_label (op0); |
5182 | return target; | |
5183 | ||
bbf6f052 RK |
5184 | case BIT_NOT_EXPR: |
5185 | op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0); | |
5186 | temp = expand_unop (mode, one_cmpl_optab, op0, target, 1); | |
5187 | if (temp == 0) | |
5188 | abort (); | |
5189 | return temp; | |
5190 | ||
5191 | case FFS_EXPR: | |
5192 | op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0); | |
5193 | temp = expand_unop (mode, ffs_optab, op0, target, 1); | |
5194 | if (temp == 0) | |
5195 | abort (); | |
5196 | return temp; | |
5197 | ||
d6a5ac33 RK |
5198 | /* ??? Can optimize bitwise operations with one arg constant. |
5199 | Can optimize (a bitwise1 n) bitwise2 (a bitwise3 b) | |
5200 | and (a bitwise1 b) bitwise2 b (etc) | |
5201 | but that is probably not worth while. */ | |
5202 | ||
5203 | /* BIT_AND_EXPR is for bitwise anding. TRUTH_AND_EXPR is for anding two | |
5204 | boolean values when we want in all cases to compute both of them. In | |
5205 | general it is fastest to do TRUTH_AND_EXPR by computing both operands | |
5206 | as actual zero-or-1 values and then bitwise anding. In cases where | |
5207 | there cannot be any side effects, better code would be made by | |
5208 | treating TRUTH_AND_EXPR like TRUTH_ANDIF_EXPR; but the question is | |
5209 | how to recognize those cases. */ | |
5210 | ||
bbf6f052 RK |
5211 | case TRUTH_AND_EXPR: |
5212 | case BIT_AND_EXPR: | |
5213 | this_optab = and_optab; | |
5214 | goto binop; | |
5215 | ||
bbf6f052 RK |
5216 | case TRUTH_OR_EXPR: |
5217 | case BIT_IOR_EXPR: | |
5218 | this_optab = ior_optab; | |
5219 | goto binop; | |
5220 | ||
874726a8 | 5221 | case TRUTH_XOR_EXPR: |
bbf6f052 RK |
5222 | case BIT_XOR_EXPR: |
5223 | this_optab = xor_optab; | |
5224 | goto binop; | |
5225 | ||
5226 | case LSHIFT_EXPR: | |
5227 | case RSHIFT_EXPR: | |
5228 | case LROTATE_EXPR: | |
5229 | case RROTATE_EXPR: | |
5230 | preexpand_calls (exp); | |
5231 | if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1))) | |
5232 | subtarget = 0; | |
5233 | op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0); | |
5234 | return expand_shift (code, mode, op0, TREE_OPERAND (exp, 1), target, | |
5235 | unsignedp); | |
5236 | ||
d6a5ac33 RK |
5237 | /* Could determine the answer when only additive constants differ. Also, |
5238 | the addition of one can be handled by changing the condition. */ | |
bbf6f052 RK |
5239 | case LT_EXPR: |
5240 | case LE_EXPR: | |
5241 | case GT_EXPR: | |
5242 | case GE_EXPR: | |
5243 | case EQ_EXPR: | |
5244 | case NE_EXPR: | |
5245 | preexpand_calls (exp); | |
5246 | temp = do_store_flag (exp, target, tmode != VOIDmode ? tmode : mode, 0); | |
5247 | if (temp != 0) | |
5248 | return temp; | |
d6a5ac33 | 5249 | |
bbf6f052 RK |
5250 | /* For foo != 0, load foo, and if it is nonzero load 1 instead. */ |
5251 | if (code == NE_EXPR && integer_zerop (TREE_OPERAND (exp, 1)) | |
5252 | && original_target | |
5253 | && GET_CODE (original_target) == REG | |
5254 | && (GET_MODE (original_target) | |
5255 | == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))) | |
5256 | { | |
d6a5ac33 RK |
5257 | temp = expand_expr (TREE_OPERAND (exp, 0), original_target, |
5258 | VOIDmode, 0); | |
5259 | ||
bbf6f052 RK |
5260 | if (temp != original_target) |
5261 | temp = copy_to_reg (temp); | |
d6a5ac33 | 5262 | |
bbf6f052 | 5263 | op1 = gen_label_rtx (); |
906c4e36 | 5264 | emit_cmp_insn (temp, const0_rtx, EQ, NULL_RTX, |
bbf6f052 RK |
5265 | GET_MODE (temp), unsignedp, 0); |
5266 | emit_jump_insn (gen_beq (op1)); | |
5267 | emit_move_insn (temp, const1_rtx); | |
5268 | emit_label (op1); | |
5269 | return temp; | |
5270 | } | |
d6a5ac33 | 5271 | |
bbf6f052 RK |
5272 | /* If no set-flag instruction, must generate a conditional |
5273 | store into a temporary variable. Drop through | |
5274 | and handle this like && and ||. */ | |
5275 | ||
5276 | case TRUTH_ANDIF_EXPR: | |
5277 | case TRUTH_ORIF_EXPR: | |
e44842fe RK |
5278 | if (! ignore |
5279 | && (target == 0 || ! safe_from_p (target, exp) | |
5280 | /* Make sure we don't have a hard reg (such as function's return | |
5281 | value) live across basic blocks, if not optimizing. */ | |
5282 | || (!optimize && GET_CODE (target) == REG | |
5283 | && REGNO (target) < FIRST_PSEUDO_REGISTER))) | |
bbf6f052 | 5284 | target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode); |
e44842fe RK |
5285 | |
5286 | if (target) | |
5287 | emit_clr_insn (target); | |
5288 | ||
bbf6f052 RK |
5289 | op1 = gen_label_rtx (); |
5290 | jumpifnot (exp, op1); | |
e44842fe RK |
5291 | |
5292 | if (target) | |
5293 | emit_0_to_1_insn (target); | |
5294 | ||
bbf6f052 | 5295 | emit_label (op1); |
e44842fe | 5296 | return ignore ? const0_rtx : target; |
bbf6f052 RK |
5297 | |
5298 | case TRUTH_NOT_EXPR: | |
5299 | op0 = expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode, 0); | |
5300 | /* The parser is careful to generate TRUTH_NOT_EXPR | |
5301 | only with operands that are always zero or one. */ | |
906c4e36 | 5302 | temp = expand_binop (mode, xor_optab, op0, const1_rtx, |
bbf6f052 RK |
5303 | target, 1, OPTAB_LIB_WIDEN); |
5304 | if (temp == 0) | |
5305 | abort (); | |
5306 | return temp; | |
5307 | ||
5308 | case COMPOUND_EXPR: | |
5309 | expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0); | |
5310 | emit_queue (); | |
5311 | return expand_expr (TREE_OPERAND (exp, 1), | |
5312 | (ignore ? const0_rtx : target), | |
5313 | VOIDmode, 0); | |
5314 | ||
5315 | case COND_EXPR: | |
5316 | { | |
5317 | /* Note that COND_EXPRs whose type is a structure or union | |
5318 | are required to be constructed to contain assignments of | |
5319 | a temporary variable, so that we can evaluate them here | |
5320 | for side effect only. If type is void, we must do likewise. */ | |
5321 | ||
5322 | /* If an arm of the branch requires a cleanup, | |
5323 | only that cleanup is performed. */ | |
5324 | ||
5325 | tree singleton = 0; | |
5326 | tree binary_op = 0, unary_op = 0; | |
5327 | tree old_cleanups = cleanups_this_call; | |
5328 | cleanups_this_call = 0; | |
5329 | ||
5330 | /* If this is (A ? 1 : 0) and A is a condition, just evaluate it and | |
5331 | convert it to our mode, if necessary. */ | |
5332 | if (integer_onep (TREE_OPERAND (exp, 1)) | |
5333 | && integer_zerop (TREE_OPERAND (exp, 2)) | |
5334 | && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<') | |
5335 | { | |
dd27116b RK |
5336 | if (ignore) |
5337 | { | |
5338 | expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, | |
5339 | modifier); | |
5340 | return const0_rtx; | |
5341 | } | |
5342 | ||
bbf6f052 RK |
5343 | op0 = expand_expr (TREE_OPERAND (exp, 0), target, mode, modifier); |
5344 | if (GET_MODE (op0) == mode) | |
5345 | return op0; | |
d6a5ac33 | 5346 | |
bbf6f052 RK |
5347 | if (target == 0) |
5348 | target = gen_reg_rtx (mode); | |
5349 | convert_move (target, op0, unsignedp); | |
5350 | return target; | |
5351 | } | |
5352 | ||
5353 | /* If we are not to produce a result, we have no target. Otherwise, | |
5354 | if a target was specified use it; it will not be used as an | |
5355 | intermediate target unless it is safe. If no target, use a | |
5356 | temporary. */ | |
5357 | ||
dd27116b | 5358 | if (ignore) |
bbf6f052 RK |
5359 | temp = 0; |
5360 | else if (original_target | |
d6a5ac33 RK |
5361 | && safe_from_p (original_target, TREE_OPERAND (exp, 0)) |
5362 | && GET_MODE (original_target) == mode) | |
bbf6f052 RK |
5363 | temp = original_target; |
5364 | else if (mode == BLKmode) | |
5365 | { | |
5366 | if (TYPE_SIZE (type) == 0 | |
5367 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
5368 | abort (); | |
673bc773 | 5369 | |
bbf6f052 RK |
5370 | temp = assign_stack_temp (BLKmode, |
5371 | (TREE_INT_CST_LOW (TYPE_SIZE (type)) | |
5372 | + BITS_PER_UNIT - 1) | |
5373 | / BITS_PER_UNIT, 0); | |
673bc773 RS |
5374 | MEM_IN_STRUCT_P (temp) |
5375 | = (TREE_CODE (type) == RECORD_TYPE | |
5376 | || TREE_CODE (type) == UNION_TYPE | |
5377 | || TREE_CODE (type) == QUAL_UNION_TYPE | |
5378 | || TREE_CODE (type) == ARRAY_TYPE); | |
bbf6f052 RK |
5379 | } |
5380 | else | |
5381 | temp = gen_reg_rtx (mode); | |
5382 | ||
5383 | /* Check for X ? A + B : A. If we have this, we can copy | |
5384 | A to the output and conditionally add B. Similarly for unary | |
5385 | operations. Don't do this if X has side-effects because | |
5386 | those side effects might affect A or B and the "?" operation is | |
5387 | a sequence point in ANSI. (We test for side effects later.) */ | |
5388 | ||
5389 | if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 1))) == '2' | |
5390 | && operand_equal_p (TREE_OPERAND (exp, 2), | |
5391 | TREE_OPERAND (TREE_OPERAND (exp, 1), 0), 0)) | |
5392 | singleton = TREE_OPERAND (exp, 2), binary_op = TREE_OPERAND (exp, 1); | |
5393 | else if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 2))) == '2' | |
5394 | && operand_equal_p (TREE_OPERAND (exp, 1), | |
5395 | TREE_OPERAND (TREE_OPERAND (exp, 2), 0), 0)) | |
5396 | singleton = TREE_OPERAND (exp, 1), binary_op = TREE_OPERAND (exp, 2); | |
5397 | else if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 1))) == '1' | |
5398 | && operand_equal_p (TREE_OPERAND (exp, 2), | |
5399 | TREE_OPERAND (TREE_OPERAND (exp, 1), 0), 0)) | |
5400 | singleton = TREE_OPERAND (exp, 2), unary_op = TREE_OPERAND (exp, 1); | |
5401 | else if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 2))) == '1' | |
5402 | && operand_equal_p (TREE_OPERAND (exp, 1), | |
5403 | TREE_OPERAND (TREE_OPERAND (exp, 2), 0), 0)) | |
5404 | singleton = TREE_OPERAND (exp, 1), unary_op = TREE_OPERAND (exp, 2); | |
5405 | ||
5406 | /* If we had X ? A + 1 : A and we can do the test of X as a store-flag | |
5407 | operation, do this as A + (X != 0). Similarly for other simple | |
5408 | binary operators. */ | |
dd27116b | 5409 | if (temp && singleton && binary_op |
bbf6f052 RK |
5410 | && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0)) |
5411 | && (TREE_CODE (binary_op) == PLUS_EXPR | |
5412 | || TREE_CODE (binary_op) == MINUS_EXPR | |
5413 | || TREE_CODE (binary_op) == BIT_IOR_EXPR | |
5414 | || TREE_CODE (binary_op) == BIT_XOR_EXPR | |
5415 | || TREE_CODE (binary_op) == BIT_AND_EXPR) | |
5416 | && integer_onep (TREE_OPERAND (binary_op, 1)) | |
5417 | && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<') | |
5418 | { | |
5419 | rtx result; | |
5420 | optab boptab = (TREE_CODE (binary_op) == PLUS_EXPR ? add_optab | |
5421 | : TREE_CODE (binary_op) == MINUS_EXPR ? sub_optab | |
5422 | : TREE_CODE (binary_op) == BIT_IOR_EXPR ? ior_optab | |
5423 | : TREE_CODE (binary_op) == BIT_XOR_EXPR ? xor_optab | |
5424 | : and_optab); | |
5425 | ||
5426 | /* If we had X ? A : A + 1, do this as A + (X == 0). | |
5427 | ||
5428 | We have to invert the truth value here and then put it | |
5429 | back later if do_store_flag fails. We cannot simply copy | |
5430 | TREE_OPERAND (exp, 0) to another variable and modify that | |
5431 | because invert_truthvalue can modify the tree pointed to | |
5432 | by its argument. */ | |
5433 | if (singleton == TREE_OPERAND (exp, 1)) | |
5434 | TREE_OPERAND (exp, 0) | |
5435 | = invert_truthvalue (TREE_OPERAND (exp, 0)); | |
5436 | ||
5437 | result = do_store_flag (TREE_OPERAND (exp, 0), | |
906c4e36 RK |
5438 | (safe_from_p (temp, singleton) |
5439 | ? temp : NULL_RTX), | |
bbf6f052 RK |
5440 | mode, BRANCH_COST <= 1); |
5441 | ||
5442 | if (result) | |
5443 | { | |
906c4e36 | 5444 | op1 = expand_expr (singleton, NULL_RTX, VOIDmode, 0); |
bbf6f052 RK |
5445 | return expand_binop (mode, boptab, op1, result, temp, |
5446 | unsignedp, OPTAB_LIB_WIDEN); | |
5447 | } | |
5448 | else if (singleton == TREE_OPERAND (exp, 1)) | |
5449 | TREE_OPERAND (exp, 0) | |
5450 | = invert_truthvalue (TREE_OPERAND (exp, 0)); | |
5451 | } | |
5452 | ||
5453 | NO_DEFER_POP; | |
5454 | op0 = gen_label_rtx (); | |
5455 | ||
5456 | if (singleton && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0))) | |
5457 | { | |
5458 | if (temp != 0) | |
5459 | { | |
5460 | /* If the target conflicts with the other operand of the | |
5461 | binary op, we can't use it. Also, we can't use the target | |
5462 | if it is a hard register, because evaluating the condition | |
5463 | might clobber it. */ | |
5464 | if ((binary_op | |
5465 | && ! safe_from_p (temp, TREE_OPERAND (binary_op, 1))) | |
5466 | || (GET_CODE (temp) == REG | |
5467 | && REGNO (temp) < FIRST_PSEUDO_REGISTER)) | |
5468 | temp = gen_reg_rtx (mode); | |
5469 | store_expr (singleton, temp, 0); | |
5470 | } | |
5471 | else | |
906c4e36 | 5472 | expand_expr (singleton, |
2937cf87 | 5473 | ignore ? const0_rtx : NULL_RTX, VOIDmode, 0); |
bbf6f052 RK |
5474 | if (cleanups_this_call) |
5475 | { | |
5476 | sorry ("aggregate value in COND_EXPR"); | |
5477 | cleanups_this_call = 0; | |
5478 | } | |
5479 | if (singleton == TREE_OPERAND (exp, 1)) | |
5480 | jumpif (TREE_OPERAND (exp, 0), op0); | |
5481 | else | |
5482 | jumpifnot (TREE_OPERAND (exp, 0), op0); | |
5483 | ||
5484 | if (binary_op && temp == 0) | |
5485 | /* Just touch the other operand. */ | |
5486 | expand_expr (TREE_OPERAND (binary_op, 1), | |
906c4e36 | 5487 | ignore ? const0_rtx : NULL_RTX, VOIDmode, 0); |
bbf6f052 RK |
5488 | else if (binary_op) |
5489 | store_expr (build (TREE_CODE (binary_op), type, | |
5490 | make_tree (type, temp), | |
5491 | TREE_OPERAND (binary_op, 1)), | |
5492 | temp, 0); | |
5493 | else | |
5494 | store_expr (build1 (TREE_CODE (unary_op), type, | |
5495 | make_tree (type, temp)), | |
5496 | temp, 0); | |
5497 | op1 = op0; | |
5498 | } | |
5499 | #if 0 | |
5500 | /* This is now done in jump.c and is better done there because it | |
5501 | produces shorter register lifetimes. */ | |
5502 | ||
5503 | /* Check for both possibilities either constants or variables | |
5504 | in registers (but not the same as the target!). If so, can | |
5505 | save branches by assigning one, branching, and assigning the | |
5506 | other. */ | |
5507 | else if (temp && GET_MODE (temp) != BLKmode | |
5508 | && (TREE_CONSTANT (TREE_OPERAND (exp, 1)) | |
5509 | || ((TREE_CODE (TREE_OPERAND (exp, 1)) == PARM_DECL | |
5510 | || TREE_CODE (TREE_OPERAND (exp, 1)) == VAR_DECL) | |
5511 | && DECL_RTL (TREE_OPERAND (exp, 1)) | |
5512 | && GET_CODE (DECL_RTL (TREE_OPERAND (exp, 1))) == REG | |
5513 | && DECL_RTL (TREE_OPERAND (exp, 1)) != temp)) | |
5514 | && (TREE_CONSTANT (TREE_OPERAND (exp, 2)) | |
5515 | || ((TREE_CODE (TREE_OPERAND (exp, 2)) == PARM_DECL | |
5516 | || TREE_CODE (TREE_OPERAND (exp, 2)) == VAR_DECL) | |
5517 | && DECL_RTL (TREE_OPERAND (exp, 2)) | |
5518 | && GET_CODE (DECL_RTL (TREE_OPERAND (exp, 2))) == REG | |
5519 | && DECL_RTL (TREE_OPERAND (exp, 2)) != temp))) | |
5520 | { | |
5521 | if (GET_CODE (temp) == REG && REGNO (temp) < FIRST_PSEUDO_REGISTER) | |
5522 | temp = gen_reg_rtx (mode); | |
5523 | store_expr (TREE_OPERAND (exp, 2), temp, 0); | |
5524 | jumpifnot (TREE_OPERAND (exp, 0), op0); | |
5525 | store_expr (TREE_OPERAND (exp, 1), temp, 0); | |
5526 | op1 = op0; | |
5527 | } | |
5528 | #endif | |
5529 | /* Check for A op 0 ? A : FOO and A op 0 ? FOO : A where OP is any | |
5530 | comparison operator. If we have one of these cases, set the | |
5531 | output to A, branch on A (cse will merge these two references), | |
5532 | then set the output to FOO. */ | |
5533 | else if (temp | |
5534 | && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<' | |
5535 | && integer_zerop (TREE_OPERAND (TREE_OPERAND (exp, 0), 1)) | |
5536 | && operand_equal_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0), | |
5537 | TREE_OPERAND (exp, 1), 0) | |
5538 | && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0)) | |
5539 | && safe_from_p (temp, TREE_OPERAND (exp, 2))) | |
5540 | { | |
5541 | if (GET_CODE (temp) == REG && REGNO (temp) < FIRST_PSEUDO_REGISTER) | |
5542 | temp = gen_reg_rtx (mode); | |
5543 | store_expr (TREE_OPERAND (exp, 1), temp, 0); | |
5544 | jumpif (TREE_OPERAND (exp, 0), op0); | |
5545 | store_expr (TREE_OPERAND (exp, 2), temp, 0); | |
5546 | op1 = op0; | |
5547 | } | |
5548 | else if (temp | |
5549 | && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<' | |
5550 | && integer_zerop (TREE_OPERAND (TREE_OPERAND (exp, 0), 1)) | |
5551 | && operand_equal_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0), | |
5552 | TREE_OPERAND (exp, 2), 0) | |
5553 | && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0)) | |
5554 | && safe_from_p (temp, TREE_OPERAND (exp, 1))) | |
5555 | { | |
5556 | if (GET_CODE (temp) == REG && REGNO (temp) < FIRST_PSEUDO_REGISTER) | |
5557 | temp = gen_reg_rtx (mode); | |
5558 | store_expr (TREE_OPERAND (exp, 2), temp, 0); | |
5559 | jumpifnot (TREE_OPERAND (exp, 0), op0); | |
5560 | store_expr (TREE_OPERAND (exp, 1), temp, 0); | |
5561 | op1 = op0; | |
5562 | } | |
5563 | else | |
5564 | { | |
5565 | op1 = gen_label_rtx (); | |
5566 | jumpifnot (TREE_OPERAND (exp, 0), op0); | |
5567 | if (temp != 0) | |
5568 | store_expr (TREE_OPERAND (exp, 1), temp, 0); | |
5569 | else | |
906c4e36 RK |
5570 | expand_expr (TREE_OPERAND (exp, 1), |
5571 | ignore ? const0_rtx : NULL_RTX, VOIDmode, 0); | |
bbf6f052 RK |
5572 | if (cleanups_this_call) |
5573 | { | |
5574 | sorry ("aggregate value in COND_EXPR"); | |
5575 | cleanups_this_call = 0; | |
5576 | } | |
5577 | ||
5578 | emit_queue (); | |
5579 | emit_jump_insn (gen_jump (op1)); | |
5580 | emit_barrier (); | |
5581 | emit_label (op0); | |
5582 | if (temp != 0) | |
5583 | store_expr (TREE_OPERAND (exp, 2), temp, 0); | |
5584 | else | |
906c4e36 RK |
5585 | expand_expr (TREE_OPERAND (exp, 2), |
5586 | ignore ? const0_rtx : NULL_RTX, VOIDmode, 0); | |
bbf6f052 RK |
5587 | } |
5588 | ||
5589 | if (cleanups_this_call) | |
5590 | { | |
5591 | sorry ("aggregate value in COND_EXPR"); | |
5592 | cleanups_this_call = 0; | |
5593 | } | |
5594 | ||
5595 | emit_queue (); | |
5596 | emit_label (op1); | |
5597 | OK_DEFER_POP; | |
5598 | cleanups_this_call = old_cleanups; | |
5599 | return temp; | |
5600 | } | |
5601 | ||
5602 | case TARGET_EXPR: | |
5603 | { | |
5604 | /* Something needs to be initialized, but we didn't know | |
5605 | where that thing was when building the tree. For example, | |
5606 | it could be the return value of a function, or a parameter | |
5607 | to a function which lays down in the stack, or a temporary | |
5608 | variable which must be passed by reference. | |
5609 | ||
5610 | We guarantee that the expression will either be constructed | |
5611 | or copied into our original target. */ | |
5612 | ||
5613 | tree slot = TREE_OPERAND (exp, 0); | |
5c062816 | 5614 | tree exp1; |
bbf6f052 RK |
5615 | |
5616 | if (TREE_CODE (slot) != VAR_DECL) | |
5617 | abort (); | |
5618 | ||
5619 | if (target == 0) | |
5620 | { | |
5621 | if (DECL_RTL (slot) != 0) | |
ac993f4f MS |
5622 | { |
5623 | target = DECL_RTL (slot); | |
5c062816 | 5624 | /* If we have already expanded the slot, so don't do |
ac993f4f | 5625 | it again. (mrs) */ |
5c062816 MS |
5626 | if (TREE_OPERAND (exp, 1) == NULL_TREE) |
5627 | return target; | |
ac993f4f | 5628 | } |
bbf6f052 RK |
5629 | else |
5630 | { | |
5631 | target = assign_stack_temp (mode, int_size_in_bytes (type), 0); | |
5632 | /* All temp slots at this level must not conflict. */ | |
5633 | preserve_temp_slots (target); | |
5634 | DECL_RTL (slot) = target; | |
5635 | } | |
5636 | ||
e287fd6e RK |
5637 | /* We set IGNORE when we know that we're already |
5638 | doing this for a cleanup. */ | |
5639 | if (ignore == 0) | |
5640 | { | |
5641 | /* Since SLOT is not known to the called function | |
5642 | to belong to its stack frame, we must build an explicit | |
5643 | cleanup. This case occurs when we must build up a reference | |
5644 | to pass the reference as an argument. In this case, | |
5645 | it is very likely that such a reference need not be | |
5646 | built here. */ | |
5647 | ||
5648 | if (TREE_OPERAND (exp, 2) == 0) | |
5649 | TREE_OPERAND (exp, 2) = maybe_build_cleanup (slot); | |
5650 | if (TREE_OPERAND (exp, 2)) | |
5651 | cleanups_this_call = tree_cons (NULL_TREE, TREE_OPERAND (exp, 2), | |
5652 | cleanups_this_call); | |
5653 | } | |
bbf6f052 RK |
5654 | } |
5655 | else | |
5656 | { | |
5657 | /* This case does occur, when expanding a parameter which | |
5658 | needs to be constructed on the stack. The target | |
5659 | is the actual stack address that we want to initialize. | |
5660 | The function we call will perform the cleanup in this case. */ | |
5661 | ||
8c042b47 RS |
5662 | /* If we have already assigned it space, use that space, |
5663 | not target that we were passed in, as our target | |
5664 | parameter is only a hint. */ | |
5665 | if (DECL_RTL (slot) != 0) | |
5666 | { | |
5667 | target = DECL_RTL (slot); | |
5668 | /* If we have already expanded the slot, so don't do | |
5669 | it again. (mrs) */ | |
5670 | if (TREE_OPERAND (exp, 1) == NULL_TREE) | |
5671 | return target; | |
5672 | } | |
5673 | ||
bbf6f052 RK |
5674 | DECL_RTL (slot) = target; |
5675 | } | |
5676 | ||
5c062816 MS |
5677 | exp1 = TREE_OPERAND (exp, 1); |
5678 | /* Mark it as expanded. */ | |
5679 | TREE_OPERAND (exp, 1) = NULL_TREE; | |
5680 | ||
5681 | return expand_expr (exp1, target, tmode, modifier); | |
bbf6f052 RK |
5682 | } |
5683 | ||
5684 | case INIT_EXPR: | |
5685 | { | |
5686 | tree lhs = TREE_OPERAND (exp, 0); | |
5687 | tree rhs = TREE_OPERAND (exp, 1); | |
5688 | tree noncopied_parts = 0; | |
5689 | tree lhs_type = TREE_TYPE (lhs); | |
5690 | ||
5691 | temp = expand_assignment (lhs, rhs, ! ignore, original_target != 0); | |
5692 | if (TYPE_NONCOPIED_PARTS (lhs_type) != 0 && !fixed_type_p (rhs)) | |
5693 | noncopied_parts = init_noncopied_parts (stabilize_reference (lhs), | |
5694 | TYPE_NONCOPIED_PARTS (lhs_type)); | |
5695 | while (noncopied_parts != 0) | |
5696 | { | |
5697 | expand_assignment (TREE_VALUE (noncopied_parts), | |
5698 | TREE_PURPOSE (noncopied_parts), 0, 0); | |
5699 | noncopied_parts = TREE_CHAIN (noncopied_parts); | |
5700 | } | |
5701 | return temp; | |
5702 | } | |
5703 | ||
5704 | case MODIFY_EXPR: | |
5705 | { | |
5706 | /* If lhs is complex, expand calls in rhs before computing it. | |
5707 | That's so we don't compute a pointer and save it over a call. | |
5708 | If lhs is simple, compute it first so we can give it as a | |
5709 | target if the rhs is just a call. This avoids an extra temp and copy | |
5710 | and that prevents a partial-subsumption which makes bad code. | |
5711 | Actually we could treat component_ref's of vars like vars. */ | |
5712 | ||
5713 | tree lhs = TREE_OPERAND (exp, 0); | |
5714 | tree rhs = TREE_OPERAND (exp, 1); | |
5715 | tree noncopied_parts = 0; | |
5716 | tree lhs_type = TREE_TYPE (lhs); | |
5717 | ||
5718 | temp = 0; | |
5719 | ||
5720 | if (TREE_CODE (lhs) != VAR_DECL | |
5721 | && TREE_CODE (lhs) != RESULT_DECL | |
5722 | && TREE_CODE (lhs) != PARM_DECL) | |
5723 | preexpand_calls (exp); | |
5724 | ||
5725 | /* Check for |= or &= of a bitfield of size one into another bitfield | |
5726 | of size 1. In this case, (unless we need the result of the | |
5727 | assignment) we can do this more efficiently with a | |
5728 | test followed by an assignment, if necessary. | |
5729 | ||
5730 | ??? At this point, we can't get a BIT_FIELD_REF here. But if | |
5731 | things change so we do, this code should be enhanced to | |
5732 | support it. */ | |
5733 | if (ignore | |
5734 | && TREE_CODE (lhs) == COMPONENT_REF | |
5735 | && (TREE_CODE (rhs) == BIT_IOR_EXPR | |
5736 | || TREE_CODE (rhs) == BIT_AND_EXPR) | |
5737 | && TREE_OPERAND (rhs, 0) == lhs | |
5738 | && TREE_CODE (TREE_OPERAND (rhs, 1)) == COMPONENT_REF | |
5739 | && TREE_INT_CST_LOW (DECL_SIZE (TREE_OPERAND (lhs, 1))) == 1 | |
5740 | && TREE_INT_CST_LOW (DECL_SIZE (TREE_OPERAND (TREE_OPERAND (rhs, 1), 1))) == 1) | |
5741 | { | |
5742 | rtx label = gen_label_rtx (); | |
5743 | ||
5744 | do_jump (TREE_OPERAND (rhs, 1), | |
5745 | TREE_CODE (rhs) == BIT_IOR_EXPR ? label : 0, | |
5746 | TREE_CODE (rhs) == BIT_AND_EXPR ? label : 0); | |
5747 | expand_assignment (lhs, convert (TREE_TYPE (rhs), | |
5748 | (TREE_CODE (rhs) == BIT_IOR_EXPR | |
5749 | ? integer_one_node | |
5750 | : integer_zero_node)), | |
5751 | 0, 0); | |
e7c33f54 | 5752 | do_pending_stack_adjust (); |
bbf6f052 RK |
5753 | emit_label (label); |
5754 | return const0_rtx; | |
5755 | } | |
5756 | ||
5757 | if (TYPE_NONCOPIED_PARTS (lhs_type) != 0 | |
5758 | && ! (fixed_type_p (lhs) && fixed_type_p (rhs))) | |
5759 | noncopied_parts = save_noncopied_parts (stabilize_reference (lhs), | |
5760 | TYPE_NONCOPIED_PARTS (lhs_type)); | |
5761 | ||
5762 | temp = expand_assignment (lhs, rhs, ! ignore, original_target != 0); | |
5763 | while (noncopied_parts != 0) | |
5764 | { | |
5765 | expand_assignment (TREE_PURPOSE (noncopied_parts), | |
5766 | TREE_VALUE (noncopied_parts), 0, 0); | |
5767 | noncopied_parts = TREE_CHAIN (noncopied_parts); | |
5768 | } | |
5769 | return temp; | |
5770 | } | |
5771 | ||
5772 | case PREINCREMENT_EXPR: | |
5773 | case PREDECREMENT_EXPR: | |
5774 | return expand_increment (exp, 0); | |
5775 | ||
5776 | case POSTINCREMENT_EXPR: | |
5777 | case POSTDECREMENT_EXPR: | |
5778 | /* Faster to treat as pre-increment if result is not used. */ | |
5779 | return expand_increment (exp, ! ignore); | |
5780 | ||
5781 | case ADDR_EXPR: | |
987c71d9 RK |
5782 | /* If nonzero, TEMP will be set to the address of something that might |
5783 | be a MEM corresponding to a stack slot. */ | |
5784 | temp = 0; | |
5785 | ||
bbf6f052 RK |
5786 | /* Are we taking the address of a nested function? */ |
5787 | if (TREE_CODE (TREE_OPERAND (exp, 0)) == FUNCTION_DECL | |
5788 | && decl_function_context (TREE_OPERAND (exp, 0)) != 0) | |
5789 | { | |
5790 | op0 = trampoline_address (TREE_OPERAND (exp, 0)); | |
5791 | op0 = force_operand (op0, target); | |
5792 | } | |
5793 | else | |
5794 | { | |
e287fd6e RK |
5795 | /* We make sure to pass const0_rtx down if we came in with |
5796 | ignore set, to avoid doing the cleanups twice for something. */ | |
5797 | op0 = expand_expr (TREE_OPERAND (exp, 0), | |
5798 | ignore ? const0_rtx : NULL_RTX, VOIDmode, | |
bbf6f052 RK |
5799 | (modifier == EXPAND_INITIALIZER |
5800 | ? modifier : EXPAND_CONST_ADDRESS)); | |
896102d0 RK |
5801 | |
5802 | /* We would like the object in memory. If it is a constant, | |
5803 | we can have it be statically allocated into memory. For | |
5804 | a non-constant (REG or SUBREG), we need to allocate some | |
5805 | memory and store the value into it. */ | |
5806 | ||
5807 | if (CONSTANT_P (op0)) | |
5808 | op0 = force_const_mem (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))), | |
5809 | op0); | |
987c71d9 RK |
5810 | else if (GET_CODE (op0) == MEM) |
5811 | temp = XEXP (op0, 0); | |
896102d0 | 5812 | |
b6f01001 RS |
5813 | /* These cases happen in Fortran. Is that legitimate? |
5814 | Should Fortran work in another way? | |
5815 | Do they happen in C? */ | |
5816 | if (GET_CODE (op0) == REG || GET_CODE (op0) == SUBREG | |
5817 | || GET_CODE (op0) == CONCAT) | |
896102d0 RK |
5818 | { |
5819 | /* If this object is in a register, it must be not | |
5820 | be BLKmode. */ | |
5821 | tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0)); | |
5822 | enum machine_mode inner_mode = TYPE_MODE (inner_type); | |
5823 | rtx memloc | |
5824 | = assign_stack_temp (inner_mode, | |
5825 | int_size_in_bytes (inner_type), 1); | |
5826 | ||
5827 | emit_move_insn (memloc, op0); | |
5828 | op0 = memloc; | |
5829 | } | |
5830 | ||
bbf6f052 RK |
5831 | if (GET_CODE (op0) != MEM) |
5832 | abort (); | |
5833 | ||
5834 | if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER) | |
5835 | return XEXP (op0, 0); | |
987c71d9 | 5836 | |
bbf6f052 RK |
5837 | op0 = force_operand (XEXP (op0, 0), target); |
5838 | } | |
987c71d9 | 5839 | |
bbf6f052 | 5840 | if (flag_force_addr && GET_CODE (op0) != REG) |
987c71d9 RK |
5841 | op0 = force_reg (Pmode, op0); |
5842 | ||
5843 | if (GET_CODE (op0) == REG) | |
5844 | mark_reg_pointer (op0); | |
5845 | ||
5846 | /* If we might have had a temp slot, add an equivalent address | |
5847 | for it. */ | |
5848 | if (temp != 0) | |
5849 | update_temp_slot_address (temp, op0); | |
5850 | ||
bbf6f052 RK |
5851 | return op0; |
5852 | ||
5853 | case ENTRY_VALUE_EXPR: | |
5854 | abort (); | |
5855 | ||
7308a047 RS |
5856 | /* COMPLEX type for Extended Pascal & Fortran */ |
5857 | case COMPLEX_EXPR: | |
5858 | { | |
5859 | enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp))); | |
6551fa4d | 5860 | rtx insns; |
7308a047 RS |
5861 | |
5862 | /* Get the rtx code of the operands. */ | |
5863 | op0 = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0); | |
5864 | op1 = expand_expr (TREE_OPERAND (exp, 1), 0, VOIDmode, 0); | |
5865 | ||
5866 | if (! target) | |
5867 | target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp))); | |
5868 | ||
6551fa4d | 5869 | start_sequence (); |
7308a047 RS |
5870 | |
5871 | /* Move the real (op0) and imaginary (op1) parts to their location. */ | |
2d7050fd RS |
5872 | emit_move_insn (gen_realpart (mode, target), op0); |
5873 | emit_move_insn (gen_imagpart (mode, target), op1); | |
7308a047 | 5874 | |
6551fa4d JW |
5875 | insns = get_insns (); |
5876 | end_sequence (); | |
5877 | ||
7308a047 | 5878 | /* Complex construction should appear as a single unit. */ |
6551fa4d JW |
5879 | /* If TARGET is a CONCAT, we got insns like RD = RS, ID = IS, |
5880 | each with a separate pseudo as destination. | |
5881 | It's not correct for flow to treat them as a unit. */ | |
6d6e61ce | 5882 | if (GET_CODE (target) != CONCAT) |
6551fa4d JW |
5883 | emit_no_conflict_block (insns, target, op0, op1, NULL_RTX); |
5884 | else | |
5885 | emit_insns (insns); | |
7308a047 RS |
5886 | |
5887 | return target; | |
5888 | } | |
5889 | ||
5890 | case REALPART_EXPR: | |
2d7050fd RS |
5891 | op0 = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0); |
5892 | return gen_realpart (mode, op0); | |
7308a047 RS |
5893 | |
5894 | case IMAGPART_EXPR: | |
2d7050fd RS |
5895 | op0 = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0); |
5896 | return gen_imagpart (mode, op0); | |
7308a047 RS |
5897 | |
5898 | case CONJ_EXPR: | |
5899 | { | |
7308a047 | 5900 | rtx imag_t; |
6551fa4d | 5901 | rtx insns; |
7308a047 RS |
5902 | |
5903 | op0 = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0); | |
5904 | ||
5905 | if (! target) | |
d6a5ac33 | 5906 | target = gen_reg_rtx (mode); |
7308a047 | 5907 | |
6551fa4d | 5908 | start_sequence (); |
7308a047 RS |
5909 | |
5910 | /* Store the realpart and the negated imagpart to target. */ | |
2d7050fd | 5911 | emit_move_insn (gen_realpart (mode, target), gen_realpart (mode, op0)); |
7308a047 | 5912 | |
2d7050fd | 5913 | imag_t = gen_imagpart (mode, target); |
d6a5ac33 RK |
5914 | temp = expand_unop (mode, neg_optab, |
5915 | gen_imagpart (mode, op0), imag_t, 0); | |
7308a047 RS |
5916 | if (temp != imag_t) |
5917 | emit_move_insn (imag_t, temp); | |
5918 | ||
6551fa4d JW |
5919 | insns = get_insns (); |
5920 | end_sequence (); | |
5921 | ||
d6a5ac33 RK |
5922 | /* Conjugate should appear as a single unit |
5923 | If TARGET is a CONCAT, we got insns like RD = RS, ID = - IS, | |
6551fa4d JW |
5924 | each with a separate pseudo as destination. |
5925 | It's not correct for flow to treat them as a unit. */ | |
6d6e61ce | 5926 | if (GET_CODE (target) != CONCAT) |
6551fa4d JW |
5927 | emit_no_conflict_block (insns, target, op0, NULL_RTX, NULL_RTX); |
5928 | else | |
5929 | emit_insns (insns); | |
7308a047 RS |
5930 | |
5931 | return target; | |
5932 | } | |
5933 | ||
bbf6f052 | 5934 | case ERROR_MARK: |
66538193 RS |
5935 | op0 = CONST0_RTX (tmode); |
5936 | if (op0 != 0) | |
5937 | return op0; | |
bbf6f052 RK |
5938 | return const0_rtx; |
5939 | ||
5940 | default: | |
90764a87 | 5941 | return (*lang_expand_expr) (exp, original_target, tmode, modifier); |
bbf6f052 RK |
5942 | } |
5943 | ||
5944 | /* Here to do an ordinary binary operator, generating an instruction | |
5945 | from the optab already placed in `this_optab'. */ | |
5946 | binop: | |
5947 | preexpand_calls (exp); | |
5948 | if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1))) | |
5949 | subtarget = 0; | |
5950 | op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0); | |
906c4e36 | 5951 | op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0); |
bbf6f052 RK |
5952 | binop2: |
5953 | temp = expand_binop (mode, this_optab, op0, op1, target, | |
5954 | unsignedp, OPTAB_LIB_WIDEN); | |
5955 | if (temp == 0) | |
5956 | abort (); | |
5957 | return temp; | |
5958 | } | |
bbf6f052 | 5959 | |
bbf6f052 | 5960 | |
ca695ac9 JB |
5961 | /* Emit bytecode to evaluate the given expression EXP to the stack. */ |
5962 | void | |
5963 | bc_expand_expr (exp) | |
5964 | tree exp; | |
bbf6f052 | 5965 | { |
ca695ac9 JB |
5966 | enum tree_code code; |
5967 | tree type, arg0; | |
5968 | rtx r; | |
5969 | struct binary_operator *binoptab; | |
5970 | struct unary_operator *unoptab; | |
5971 | struct increment_operator *incroptab; | |
5972 | struct bc_label *lab, *lab1; | |
5973 | enum bytecode_opcode opcode; | |
5974 | ||
5975 | ||
5976 | code = TREE_CODE (exp); | |
5977 | ||
5978 | switch (code) | |
bbf6f052 | 5979 | { |
ca695ac9 JB |
5980 | case PARM_DECL: |
5981 | ||
5982 | if (DECL_RTL (exp) == 0) | |
bbf6f052 | 5983 | { |
ca695ac9 JB |
5984 | error_with_decl (exp, "prior parameter's size depends on `%s'"); |
5985 | return; | |
bbf6f052 | 5986 | } |
ca695ac9 JB |
5987 | |
5988 | bc_load_parmaddr (DECL_RTL (exp)); | |
5989 | bc_load_memory (TREE_TYPE (exp), exp); | |
5990 | ||
5991 | return; | |
5992 | ||
5993 | case VAR_DECL: | |
5994 | ||
5995 | if (DECL_RTL (exp) == 0) | |
5996 | abort (); | |
5997 | ||
5998 | #if 0 | |
e7a42772 | 5999 | if (BYTECODE_LABEL (DECL_RTL (exp))) |
ca695ac9 JB |
6000 | bc_load_externaddr (DECL_RTL (exp)); |
6001 | else | |
6002 | bc_load_localaddr (DECL_RTL (exp)); | |
6003 | #endif | |
6004 | if (TREE_PUBLIC (exp)) | |
e7a42772 JB |
6005 | bc_load_externaddr_id (DECL_ASSEMBLER_NAME (exp), |
6006 | BYTECODE_BC_LABEL (DECL_RTL (exp))->offset); | |
ca695ac9 JB |
6007 | else |
6008 | bc_load_localaddr (DECL_RTL (exp)); | |
6009 | ||
6010 | bc_load_memory (TREE_TYPE (exp), exp); | |
6011 | return; | |
6012 | ||
6013 | case INTEGER_CST: | |
6014 | ||
6015 | #ifdef DEBUG_PRINT_CODE | |
6016 | fprintf (stderr, " [%x]\n", TREE_INT_CST_LOW (exp)); | |
6017 | #endif | |
6bd6178d | 6018 | bc_emit_instruction (mode_to_const_map[(int) (DECL_BIT_FIELD (exp) |
ca695ac9 | 6019 | ? SImode |
6bd6178d | 6020 | : TYPE_MODE (TREE_TYPE (exp)))], |
ca695ac9 JB |
6021 | (HOST_WIDE_INT) TREE_INT_CST_LOW (exp)); |
6022 | return; | |
6023 | ||
6024 | case REAL_CST: | |
6025 | ||
c02bd5d9 | 6026 | #if 0 |
ca695ac9 JB |
6027 | #ifdef DEBUG_PRINT_CODE |
6028 | fprintf (stderr, " [%g]\n", (double) TREE_INT_CST_LOW (exp)); | |
6029 | #endif | |
c02bd5d9 | 6030 | /* FIX THIS: find a better way to pass real_cst's. -bson */ |
ca695ac9 JB |
6031 | bc_emit_instruction (mode_to_const_map[TYPE_MODE (TREE_TYPE (exp))], |
6032 | (double) TREE_REAL_CST (exp)); | |
c02bd5d9 JB |
6033 | #else |
6034 | abort (); | |
6035 | #endif | |
6036 | ||
ca695ac9 JB |
6037 | return; |
6038 | ||
6039 | case CALL_EXPR: | |
6040 | ||
6041 | /* We build a call description vector describing the type of | |
6042 | the return value and of the arguments; this call vector, | |
6043 | together with a pointer to a location for the return value | |
6044 | and the base of the argument list, is passed to the low | |
6045 | level machine dependent call subroutine, which is responsible | |
6046 | for putting the arguments wherever real functions expect | |
6047 | them, as well as getting the return value back. */ | |
6048 | { | |
6049 | tree calldesc = 0, arg; | |
6050 | int nargs = 0, i; | |
6051 | rtx retval; | |
6052 | ||
6053 | /* Push the evaluated args on the evaluation stack in reverse | |
6054 | order. Also make an entry for each arg in the calldesc | |
6055 | vector while we're at it. */ | |
6056 | ||
6057 | TREE_OPERAND (exp, 1) = nreverse (TREE_OPERAND (exp, 1)); | |
6058 | ||
6059 | for (arg = TREE_OPERAND (exp, 1); arg; arg = TREE_CHAIN (arg)) | |
6060 | { | |
6061 | ++nargs; | |
6062 | bc_expand_expr (TREE_VALUE (arg)); | |
6063 | ||
6064 | calldesc = tree_cons ((tree) 0, | |
6065 | size_in_bytes (TREE_TYPE (TREE_VALUE (arg))), | |
6066 | calldesc); | |
6067 | calldesc = tree_cons ((tree) 0, | |
6068 | bc_runtime_type_code (TREE_TYPE (TREE_VALUE (arg))), | |
6069 | calldesc); | |
6070 | } | |
6071 | ||
6072 | TREE_OPERAND (exp, 1) = nreverse (TREE_OPERAND (exp, 1)); | |
6073 | ||
6074 | /* Allocate a location for the return value and push its | |
6075 | address on the evaluation stack. Also make an entry | |
6076 | at the front of the calldesc for the return value type. */ | |
6077 | ||
6078 | type = TREE_TYPE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0)))); | |
6079 | retval = bc_allocate_local (int_size_in_bytes (type), TYPE_ALIGN (type)); | |
6080 | bc_load_localaddr (retval); | |
6081 | ||
6082 | calldesc = tree_cons ((tree) 0, size_in_bytes (type), calldesc); | |
6083 | calldesc = tree_cons ((tree) 0, bc_runtime_type_code (type), calldesc); | |
6084 | ||
6085 | /* Prepend the argument count. */ | |
6086 | calldesc = tree_cons ((tree) 0, | |
6087 | build_int_2 (nargs, 0), | |
6088 | calldesc); | |
6089 | ||
6090 | /* Push the address of the call description vector on the stack. */ | |
6091 | calldesc = build_nt (CONSTRUCTOR, (tree) 0, calldesc); | |
6092 | TREE_TYPE (calldesc) = build_array_type (integer_type_node, | |
6093 | build_index_type (build_int_2 (nargs * 2, 0))); | |
6094 | r = output_constant_def (calldesc); | |
6095 | bc_load_externaddr (r); | |
6096 | ||
6097 | /* Push the address of the function to be called. */ | |
6098 | bc_expand_expr (TREE_OPERAND (exp, 0)); | |
6099 | ||
6100 | /* Call the function, popping its address and the calldesc vector | |
6101 | address off the evaluation stack in the process. */ | |
6102 | bc_emit_instruction (call); | |
6103 | ||
6104 | /* Pop the arguments off the stack. */ | |
6105 | bc_adjust_stack (nargs); | |
6106 | ||
6107 | /* Load the return value onto the stack. */ | |
6108 | bc_load_localaddr (retval); | |
6109 | bc_load_memory (type, TREE_OPERAND (exp, 0)); | |
6110 | } | |
6111 | return; | |
6112 | ||
6113 | case SAVE_EXPR: | |
6114 | ||
6115 | if (!SAVE_EXPR_RTL (exp)) | |
bbf6f052 | 6116 | { |
ca695ac9 JB |
6117 | /* First time around: copy to local variable */ |
6118 | SAVE_EXPR_RTL (exp) = bc_allocate_local (int_size_in_bytes (TREE_TYPE (exp)), | |
6119 | TYPE_ALIGN (TREE_TYPE(exp))); | |
6120 | bc_expand_expr (TREE_OPERAND (exp, 0)); | |
6d6e61ce | 6121 | bc_emit_instruction (duplicate); |
ca695ac9 JB |
6122 | |
6123 | bc_load_localaddr (SAVE_EXPR_RTL (exp)); | |
6124 | bc_store_memory (TREE_TYPE (exp), TREE_OPERAND (exp, 0)); | |
bbf6f052 | 6125 | } |
ca695ac9 | 6126 | else |
bbf6f052 | 6127 | { |
ca695ac9 JB |
6128 | /* Consecutive reference: use saved copy */ |
6129 | bc_load_localaddr (SAVE_EXPR_RTL (exp)); | |
6130 | bc_load_memory (TREE_TYPE (exp), TREE_OPERAND (exp, 0)); | |
bbf6f052 | 6131 | } |
ca695ac9 JB |
6132 | return; |
6133 | ||
6134 | #if 0 | |
6135 | /* FIXME: the XXXX_STMT codes have been removed in GCC2, but | |
6136 | how are they handled instead? */ | |
6137 | case LET_STMT: | |
6138 | ||
6139 | TREE_USED (exp) = 1; | |
6140 | bc_expand_expr (STMT_BODY (exp)); | |
6141 | return; | |
6142 | #endif | |
6143 | ||
6144 | case NOP_EXPR: | |
6145 | case CONVERT_EXPR: | |
6146 | ||
6147 | bc_expand_expr (TREE_OPERAND (exp, 0)); | |
6148 | bc_expand_conversion (TREE_TYPE (TREE_OPERAND (exp, 0)), TREE_TYPE (exp)); | |
6149 | return; | |
6150 | ||
6151 | case MODIFY_EXPR: | |
6152 | ||
c02bd5d9 | 6153 | expand_assignment (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1), 0, 0); |
ca695ac9 JB |
6154 | return; |
6155 | ||
6156 | case ADDR_EXPR: | |
6157 | ||
6158 | bc_expand_address (TREE_OPERAND (exp, 0)); | |
6159 | return; | |
6160 | ||
6161 | case INDIRECT_REF: | |
6162 | ||
6163 | bc_expand_expr (TREE_OPERAND (exp, 0)); | |
6164 | bc_load_memory (TREE_TYPE (exp), TREE_OPERAND (exp, 0)); | |
6165 | return; | |
6166 | ||
6167 | case ARRAY_REF: | |
6168 | ||
6169 | bc_expand_expr (bc_canonicalize_array_ref (exp)); | |
6170 | return; | |
6171 | ||
6172 | case COMPONENT_REF: | |
6173 | ||
6174 | bc_expand_component_address (exp); | |
6175 | ||
6176 | /* If we have a bitfield, generate a proper load */ | |
6177 | bc_load_memory (TREE_TYPE (TREE_OPERAND (exp, 1)), TREE_OPERAND (exp, 1)); | |
6178 | return; | |
6179 | ||
6180 | case COMPOUND_EXPR: | |
6181 | ||
6182 | bc_expand_expr (TREE_OPERAND (exp, 0)); | |
6183 | bc_emit_instruction (drop); | |
6184 | bc_expand_expr (TREE_OPERAND (exp, 1)); | |
6185 | return; | |
6186 | ||
6187 | case COND_EXPR: | |
6188 | ||
6189 | bc_expand_expr (TREE_OPERAND (exp, 0)); | |
6190 | bc_expand_truth_conversion (TREE_TYPE (TREE_OPERAND (exp, 0))); | |
6191 | lab = bc_get_bytecode_label (); | |
c02bd5d9 | 6192 | bc_emit_bytecode (xjumpifnot); |
ca695ac9 JB |
6193 | bc_emit_bytecode_labelref (lab); |
6194 | ||
6195 | #ifdef DEBUG_PRINT_CODE | |
6196 | fputc ('\n', stderr); | |
6197 | #endif | |
6198 | bc_expand_expr (TREE_OPERAND (exp, 1)); | |
6199 | lab1 = bc_get_bytecode_label (); | |
6200 | bc_emit_bytecode (jump); | |
6201 | bc_emit_bytecode_labelref (lab1); | |
6202 | ||
6203 | #ifdef DEBUG_PRINT_CODE | |
6204 | fputc ('\n', stderr); | |
6205 | #endif | |
6206 | ||
6207 | bc_emit_bytecode_labeldef (lab); | |
6208 | bc_expand_expr (TREE_OPERAND (exp, 2)); | |
6209 | bc_emit_bytecode_labeldef (lab1); | |
6210 | return; | |
6211 | ||
6212 | case TRUTH_ANDIF_EXPR: | |
6213 | ||
c02bd5d9 | 6214 | opcode = xjumpifnot; |
ca695ac9 JB |
6215 | goto andorif; |
6216 | ||
6217 | case TRUTH_ORIF_EXPR: | |
6218 | ||
c02bd5d9 | 6219 | opcode = xjumpif; |
ca695ac9 JB |
6220 | goto andorif; |
6221 | ||
6222 | case PLUS_EXPR: | |
6223 | ||
6224 | binoptab = optab_plus_expr; | |
6225 | goto binop; | |
6226 | ||
6227 | case MINUS_EXPR: | |
6228 | ||
6229 | binoptab = optab_minus_expr; | |
6230 | goto binop; | |
6231 | ||
6232 | case MULT_EXPR: | |
6233 | ||
6234 | binoptab = optab_mult_expr; | |
6235 | goto binop; | |
6236 | ||
6237 | case TRUNC_DIV_EXPR: | |
6238 | case FLOOR_DIV_EXPR: | |
6239 | case CEIL_DIV_EXPR: | |
6240 | case ROUND_DIV_EXPR: | |
6241 | case EXACT_DIV_EXPR: | |
6242 | ||
6243 | binoptab = optab_trunc_div_expr; | |
6244 | goto binop; | |
6245 | ||
6246 | case TRUNC_MOD_EXPR: | |
6247 | case FLOOR_MOD_EXPR: | |
6248 | case CEIL_MOD_EXPR: | |
6249 | case ROUND_MOD_EXPR: | |
6250 | ||
6251 | binoptab = optab_trunc_mod_expr; | |
6252 | goto binop; | |
6253 | ||
6254 | case FIX_ROUND_EXPR: | |
6255 | case FIX_FLOOR_EXPR: | |
6256 | case FIX_CEIL_EXPR: | |
6257 | abort (); /* Not used for C. */ | |
6258 | ||
6259 | case FIX_TRUNC_EXPR: | |
6260 | case FLOAT_EXPR: | |
6261 | case MAX_EXPR: | |
6262 | case MIN_EXPR: | |
6263 | case FFS_EXPR: | |
6264 | case LROTATE_EXPR: | |
6265 | case RROTATE_EXPR: | |
6266 | abort (); /* FIXME */ | |
6267 | ||
6268 | case RDIV_EXPR: | |
6269 | ||
6270 | binoptab = optab_rdiv_expr; | |
6271 | goto binop; | |
6272 | ||
6273 | case BIT_AND_EXPR: | |
6274 | ||
6275 | binoptab = optab_bit_and_expr; | |
6276 | goto binop; | |
6277 | ||
6278 | case BIT_IOR_EXPR: | |
6279 | ||
6280 | binoptab = optab_bit_ior_expr; | |
6281 | goto binop; | |
6282 | ||
6283 | case BIT_XOR_EXPR: | |
6284 | ||
6285 | binoptab = optab_bit_xor_expr; | |
6286 | goto binop; | |
6287 | ||
6288 | case LSHIFT_EXPR: | |
6289 | ||
6290 | binoptab = optab_lshift_expr; | |
6291 | goto binop; | |
6292 | ||
6293 | case RSHIFT_EXPR: | |
6294 | ||
6295 | binoptab = optab_rshift_expr; | |
6296 | goto binop; | |
6297 | ||
6298 | case TRUTH_AND_EXPR: | |
6299 | ||
6300 | binoptab = optab_truth_and_expr; | |
6301 | goto binop; | |
6302 | ||
6303 | case TRUTH_OR_EXPR: | |
6304 | ||
6305 | binoptab = optab_truth_or_expr; | |
6306 | goto binop; | |
6307 | ||
6308 | case LT_EXPR: | |
6309 | ||
6310 | binoptab = optab_lt_expr; | |
6311 | goto binop; | |
6312 | ||
6313 | case LE_EXPR: | |
6314 | ||
6315 | binoptab = optab_le_expr; | |
6316 | goto binop; | |
6317 | ||
6318 | case GE_EXPR: | |
6319 | ||
6320 | binoptab = optab_ge_expr; | |
6321 | goto binop; | |
6322 | ||
6323 | case GT_EXPR: | |
6324 | ||
6325 | binoptab = optab_gt_expr; | |
6326 | goto binop; | |
6327 | ||
6328 | case EQ_EXPR: | |
6329 | ||
6330 | binoptab = optab_eq_expr; | |
6331 | goto binop; | |
6332 | ||
6333 | case NE_EXPR: | |
6334 | ||
6335 | binoptab = optab_ne_expr; | |
6336 | goto binop; | |
6337 | ||
6338 | case NEGATE_EXPR: | |
6339 | ||
6340 | unoptab = optab_negate_expr; | |
6341 | goto unop; | |
6342 | ||
6343 | case BIT_NOT_EXPR: | |
6344 | ||
6345 | unoptab = optab_bit_not_expr; | |
6346 | goto unop; | |
6347 | ||
6348 | case TRUTH_NOT_EXPR: | |
6349 | ||
6350 | unoptab = optab_truth_not_expr; | |
6351 | goto unop; | |
6352 | ||
6353 | case PREDECREMENT_EXPR: | |
6354 | ||
6355 | incroptab = optab_predecrement_expr; | |
6356 | goto increment; | |
6357 | ||
6358 | case PREINCREMENT_EXPR: | |
6359 | ||
6360 | incroptab = optab_preincrement_expr; | |
6361 | goto increment; | |
6362 | ||
6363 | case POSTDECREMENT_EXPR: | |
6364 | ||
6365 | incroptab = optab_postdecrement_expr; | |
6366 | goto increment; | |
6367 | ||
6368 | case POSTINCREMENT_EXPR: | |
6369 | ||
6370 | incroptab = optab_postincrement_expr; | |
6371 | goto increment; | |
6372 | ||
6373 | case CONSTRUCTOR: | |
6374 | ||
6375 | bc_expand_constructor (exp); | |
6376 | return; | |
6377 | ||
6378 | case ERROR_MARK: | |
6379 | case RTL_EXPR: | |
6380 | ||
6381 | return; | |
6382 | ||
6383 | case BIND_EXPR: | |
6384 | { | |
6385 | tree vars = TREE_OPERAND (exp, 0); | |
6386 | int vars_need_expansion = 0; | |
6387 | ||
6388 | /* Need to open a binding contour here because | |
6389 | if there are any cleanups they most be contained here. */ | |
6390 | expand_start_bindings (0); | |
6391 | ||
6392 | /* Mark the corresponding BLOCK for output. */ | |
6393 | if (TREE_OPERAND (exp, 2) != 0) | |
6394 | TREE_USED (TREE_OPERAND (exp, 2)) = 1; | |
6395 | ||
6396 | /* If VARS have not yet been expanded, expand them now. */ | |
6397 | while (vars) | |
6398 | { | |
6399 | if (DECL_RTL (vars) == 0) | |
6400 | { | |
6401 | vars_need_expansion = 1; | |
6402 | bc_expand_decl (vars, 0); | |
6403 | } | |
6404 | bc_expand_decl_init (vars); | |
6405 | vars = TREE_CHAIN (vars); | |
6406 | } | |
6407 | ||
6408 | bc_expand_expr (TREE_OPERAND (exp, 1)); | |
6409 | ||
6410 | expand_end_bindings (TREE_OPERAND (exp, 0), 0, 0); | |
6411 | ||
6412 | return; | |
6413 | } | |
6414 | } | |
6415 | ||
6416 | abort (); | |
6417 | ||
6418 | binop: | |
6419 | ||
6420 | bc_expand_binary_operation (binoptab, TREE_TYPE (exp), | |
6421 | TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1)); | |
6422 | return; | |
6423 | ||
6424 | ||
6425 | unop: | |
6426 | ||
6427 | bc_expand_unary_operation (unoptab, TREE_TYPE (exp), TREE_OPERAND (exp, 0)); | |
6428 | return; | |
6429 | ||
6430 | ||
6431 | andorif: | |
6432 | ||
6433 | bc_expand_expr (TREE_OPERAND (exp, 0)); | |
6434 | bc_expand_truth_conversion (TREE_TYPE (TREE_OPERAND (exp, 0))); | |
6435 | lab = bc_get_bytecode_label (); | |
6436 | ||
6d6e61ce | 6437 | bc_emit_instruction (duplicate); |
ca695ac9 JB |
6438 | bc_emit_bytecode (opcode); |
6439 | bc_emit_bytecode_labelref (lab); | |
6440 | ||
6441 | #ifdef DEBUG_PRINT_CODE | |
6442 | fputc ('\n', stderr); | |
6443 | #endif | |
6444 | ||
6445 | bc_emit_instruction (drop); | |
6446 | ||
6447 | bc_expand_expr (TREE_OPERAND (exp, 1)); | |
6448 | bc_expand_truth_conversion (TREE_TYPE (TREE_OPERAND (exp, 1))); | |
6449 | bc_emit_bytecode_labeldef (lab); | |
6450 | return; | |
6451 | ||
6452 | ||
6453 | increment: | |
6454 | ||
6455 | type = TREE_TYPE (TREE_OPERAND (exp, 0)); | |
6456 | ||
6457 | /* Push the quantum. */ | |
6458 | bc_expand_expr (TREE_OPERAND (exp, 1)); | |
6459 | ||
6460 | /* Convert it to the lvalue's type. */ | |
6461 | bc_expand_conversion (TREE_TYPE (TREE_OPERAND (exp, 1)), type); | |
6462 | ||
6463 | /* Push the address of the lvalue */ | |
c02bd5d9 | 6464 | bc_expand_expr (build1 (ADDR_EXPR, TYPE_POINTER_TO (type), TREE_OPERAND (exp, 0))); |
ca695ac9 JB |
6465 | |
6466 | /* Perform actual increment */ | |
c02bd5d9 | 6467 | bc_expand_increment (incroptab, type); |
ca695ac9 JB |
6468 | return; |
6469 | } | |
6470 | \f | |
6471 | /* Return the alignment in bits of EXP, a pointer valued expression. | |
6472 | But don't return more than MAX_ALIGN no matter what. | |
6473 | The alignment returned is, by default, the alignment of the thing that | |
6474 | EXP points to (if it is not a POINTER_TYPE, 0 is returned). | |
6475 | ||
6476 | Otherwise, look at the expression to see if we can do better, i.e., if the | |
6477 | expression is actually pointing at an object whose alignment is tighter. */ | |
6478 | ||
6479 | static int | |
6480 | get_pointer_alignment (exp, max_align) | |
6481 | tree exp; | |
6482 | unsigned max_align; | |
6483 | { | |
6484 | unsigned align, inner; | |
6485 | ||
6486 | if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE) | |
6487 | return 0; | |
6488 | ||
6489 | align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp))); | |
6490 | align = MIN (align, max_align); | |
6491 | ||
6492 | while (1) | |
6493 | { | |
6494 | switch (TREE_CODE (exp)) | |
6495 | { | |
6496 | case NOP_EXPR: | |
6497 | case CONVERT_EXPR: | |
6498 | case NON_LVALUE_EXPR: | |
6499 | exp = TREE_OPERAND (exp, 0); | |
6500 | if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE) | |
6501 | return align; | |
6502 | inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp))); | |
8dc2fbcf | 6503 | align = MIN (inner, max_align); |
ca695ac9 JB |
6504 | break; |
6505 | ||
6506 | case PLUS_EXPR: | |
6507 | /* If sum of pointer + int, restrict our maximum alignment to that | |
6508 | imposed by the integer. If not, we can't do any better than | |
6509 | ALIGN. */ | |
6510 | if (TREE_CODE (TREE_OPERAND (exp, 1)) != INTEGER_CST) | |
6511 | return align; | |
6512 | ||
6513 | while (((TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)) * BITS_PER_UNIT) | |
6514 | & (max_align - 1)) | |
6515 | != 0) | |
6516 | max_align >>= 1; | |
6517 | ||
6518 | exp = TREE_OPERAND (exp, 0); | |
6519 | break; | |
6520 | ||
6521 | case ADDR_EXPR: | |
6522 | /* See what we are pointing at and look at its alignment. */ | |
6523 | exp = TREE_OPERAND (exp, 0); | |
6524 | if (TREE_CODE (exp) == FUNCTION_DECL) | |
8dc2fbcf | 6525 | align = FUNCTION_BOUNDARY; |
ca695ac9 | 6526 | else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'd') |
8dc2fbcf | 6527 | align = DECL_ALIGN (exp); |
ca695ac9 JB |
6528 | #ifdef CONSTANT_ALIGNMENT |
6529 | else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c') | |
6530 | align = CONSTANT_ALIGNMENT (exp, align); | |
6531 | #endif | |
6532 | return MIN (align, max_align); | |
6533 | ||
6534 | default: | |
6535 | return align; | |
6536 | } | |
6537 | } | |
6538 | } | |
6539 | \f | |
6540 | /* Return the tree node and offset if a given argument corresponds to | |
6541 | a string constant. */ | |
6542 | ||
6543 | static tree | |
6544 | string_constant (arg, ptr_offset) | |
6545 | tree arg; | |
6546 | tree *ptr_offset; | |
6547 | { | |
6548 | STRIP_NOPS (arg); | |
6549 | ||
6550 | if (TREE_CODE (arg) == ADDR_EXPR | |
6551 | && TREE_CODE (TREE_OPERAND (arg, 0)) == STRING_CST) | |
6552 | { | |
6553 | *ptr_offset = integer_zero_node; | |
6554 | return TREE_OPERAND (arg, 0); | |
6555 | } | |
6556 | else if (TREE_CODE (arg) == PLUS_EXPR) | |
6557 | { | |
6558 | tree arg0 = TREE_OPERAND (arg, 0); | |
6559 | tree arg1 = TREE_OPERAND (arg, 1); | |
6560 | ||
6561 | STRIP_NOPS (arg0); | |
6562 | STRIP_NOPS (arg1); | |
6563 | ||
6564 | if (TREE_CODE (arg0) == ADDR_EXPR | |
6565 | && TREE_CODE (TREE_OPERAND (arg0, 0)) == STRING_CST) | |
6566 | { | |
6567 | *ptr_offset = arg1; | |
6568 | return TREE_OPERAND (arg0, 0); | |
6569 | } | |
6570 | else if (TREE_CODE (arg1) == ADDR_EXPR | |
6571 | && TREE_CODE (TREE_OPERAND (arg1, 0)) == STRING_CST) | |
6572 | { | |
6573 | *ptr_offset = arg0; | |
6574 | return TREE_OPERAND (arg1, 0); | |
6575 | } | |
6576 | } | |
6577 | ||
6578 | return 0; | |
6579 | } | |
6580 | ||
6581 | /* Compute the length of a C string. TREE_STRING_LENGTH is not the right | |
6582 | way, because it could contain a zero byte in the middle. | |
6583 | TREE_STRING_LENGTH is the size of the character array, not the string. | |
6584 | ||
6585 | Unfortunately, string_constant can't access the values of const char | |
6586 | arrays with initializers, so neither can we do so here. */ | |
6587 | ||
6588 | static tree | |
6589 | c_strlen (src) | |
6590 | tree src; | |
6591 | { | |
6592 | tree offset_node; | |
6593 | int offset, max; | |
6594 | char *ptr; | |
6595 | ||
6596 | src = string_constant (src, &offset_node); | |
6597 | if (src == 0) | |
6598 | return 0; | |
6599 | max = TREE_STRING_LENGTH (src); | |
6600 | ptr = TREE_STRING_POINTER (src); | |
6601 | if (offset_node && TREE_CODE (offset_node) != INTEGER_CST) | |
6602 | { | |
6603 | /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't | |
6604 | compute the offset to the following null if we don't know where to | |
6605 | start searching for it. */ | |
6606 | int i; | |
6607 | for (i = 0; i < max; i++) | |
6608 | if (ptr[i] == 0) | |
6609 | return 0; | |
6610 | /* We don't know the starting offset, but we do know that the string | |
6611 | has no internal zero bytes. We can assume that the offset falls | |
6612 | within the bounds of the string; otherwise, the programmer deserves | |
6613 | what he gets. Subtract the offset from the length of the string, | |
6614 | and return that. */ | |
6615 | /* This would perhaps not be valid if we were dealing with named | |
6616 | arrays in addition to literal string constants. */ | |
6617 | return size_binop (MINUS_EXPR, size_int (max), offset_node); | |
6618 | } | |
6619 | ||
6620 | /* We have a known offset into the string. Start searching there for | |
6621 | a null character. */ | |
6622 | if (offset_node == 0) | |
6623 | offset = 0; | |
6624 | else | |
6625 | { | |
6626 | /* Did we get a long long offset? If so, punt. */ | |
6627 | if (TREE_INT_CST_HIGH (offset_node) != 0) | |
6628 | return 0; | |
6629 | offset = TREE_INT_CST_LOW (offset_node); | |
6630 | } | |
6631 | /* If the offset is known to be out of bounds, warn, and call strlen at | |
6632 | runtime. */ | |
6633 | if (offset < 0 || offset > max) | |
6634 | { | |
6635 | warning ("offset outside bounds of constant string"); | |
6636 | return 0; | |
6637 | } | |
6638 | /* Use strlen to search for the first zero byte. Since any strings | |
6639 | constructed with build_string will have nulls appended, we win even | |
6640 | if we get handed something like (char[4])"abcd". | |
6641 | ||
6642 | Since OFFSET is our starting index into the string, no further | |
6643 | calculation is needed. */ | |
6644 | return size_int (strlen (ptr + offset)); | |
6645 | } | |
6646 | \f | |
6647 | /* Expand an expression EXP that calls a built-in function, | |
6648 | with result going to TARGET if that's convenient | |
6649 | (and in mode MODE if that's convenient). | |
6650 | SUBTARGET may be used as the target for computing one of EXP's operands. | |
6651 | IGNORE is nonzero if the value is to be ignored. */ | |
6652 | ||
98aad286 RK |
6653 | #define CALLED_AS_BUILT_IN(NODE) \ |
6654 | (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10)) | |
6655 | ||
ca695ac9 JB |
6656 | static rtx |
6657 | expand_builtin (exp, target, subtarget, mode, ignore) | |
6658 | tree exp; | |
6659 | rtx target; | |
6660 | rtx subtarget; | |
6661 | enum machine_mode mode; | |
6662 | int ignore; | |
6663 | { | |
6664 | tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0); | |
6665 | tree arglist = TREE_OPERAND (exp, 1); | |
6666 | rtx op0; | |
6667 | rtx lab1, insns; | |
6668 | enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp)); | |
6669 | optab builtin_optab; | |
6670 | ||
6671 | switch (DECL_FUNCTION_CODE (fndecl)) | |
6672 | { | |
6673 | case BUILT_IN_ABS: | |
6674 | case BUILT_IN_LABS: | |
6675 | case BUILT_IN_FABS: | |
6676 | /* build_function_call changes these into ABS_EXPR. */ | |
6677 | abort (); | |
6678 | ||
6679 | case BUILT_IN_SIN: | |
6680 | case BUILT_IN_COS: | |
6681 | case BUILT_IN_FSQRT: | |
6682 | /* If not optimizing, call the library function. */ | |
6683 | if (! optimize) | |
6684 | break; | |
6685 | ||
6686 | if (arglist == 0 | |
6687 | /* Arg could be wrong type if user redeclared this fcn wrong. */ | |
6688 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != REAL_TYPE) | |
7b073ca6 | 6689 | break; |
ca695ac9 JB |
6690 | |
6691 | /* Stabilize and compute the argument. */ | |
6692 | if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL | |
6693 | && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL) | |
6694 | { | |
6695 | exp = copy_node (exp); | |
6696 | arglist = copy_node (arglist); | |
6697 | TREE_OPERAND (exp, 1) = arglist; | |
6698 | TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist)); | |
6699 | } | |
6700 | op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0); | |
6701 | ||
6702 | /* Make a suitable register to place result in. */ | |
6703 | target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp))); | |
6704 | ||
6705 | emit_queue (); | |
6706 | start_sequence (); | |
6707 | ||
6708 | switch (DECL_FUNCTION_CODE (fndecl)) | |
6709 | { | |
6710 | case BUILT_IN_SIN: | |
6711 | builtin_optab = sin_optab; break; | |
6712 | case BUILT_IN_COS: | |
6713 | builtin_optab = cos_optab; break; | |
6714 | case BUILT_IN_FSQRT: | |
6715 | builtin_optab = sqrt_optab; break; | |
6716 | default: | |
6717 | abort (); | |
6718 | } | |
6719 | ||
6720 | /* Compute into TARGET. | |
6721 | Set TARGET to wherever the result comes back. */ | |
6722 | target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))), | |
6723 | builtin_optab, op0, target, 0); | |
6724 | ||
6725 | /* If we were unable to expand via the builtin, stop the | |
6726 | sequence (without outputting the insns) and break, causing | |
6727 | a call the the library function. */ | |
6728 | if (target == 0) | |
6729 | { | |
6730 | end_sequence (); | |
6731 | break; | |
6732 | } | |
6733 | ||
6734 | /* Check the results by default. But if flag_fast_math is turned on, | |
6735 | then assume sqrt will always be called with valid arguments. */ | |
6736 | ||
6737 | if (! flag_fast_math) | |
6738 | { | |
6739 | /* Don't define the builtin FP instructions | |
6740 | if your machine is not IEEE. */ | |
6741 | if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT) | |
6742 | abort (); | |
6743 | ||
6744 | lab1 = gen_label_rtx (); | |
6745 | ||
6746 | /* Test the result; if it is NaN, set errno=EDOM because | |
6747 | the argument was not in the domain. */ | |
6748 | emit_cmp_insn (target, target, EQ, 0, GET_MODE (target), 0, 0); | |
6749 | emit_jump_insn (gen_beq (lab1)); | |
6750 | ||
6751 | #if TARGET_EDOM | |
6752 | { | |
6753 | #ifdef GEN_ERRNO_RTX | |
6754 | rtx errno_rtx = GEN_ERRNO_RTX; | |
6755 | #else | |
6756 | rtx errno_rtx | |
6757 | = gen_rtx (MEM, word_mode, gen_rtx (SYMBOL_REF, Pmode, "*errno")); | |
6758 | #endif | |
6759 | ||
6760 | emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM)); | |
6761 | } | |
6762 | #else | |
6763 | /* We can't set errno=EDOM directly; let the library call do it. | |
6764 | Pop the arguments right away in case the call gets deleted. */ | |
6765 | NO_DEFER_POP; | |
6766 | expand_call (exp, target, 0); | |
6767 | OK_DEFER_POP; | |
6768 | #endif | |
6769 | ||
6770 | emit_label (lab1); | |
6771 | } | |
6772 | ||
6773 | /* Output the entire sequence. */ | |
6774 | insns = get_insns (); | |
6775 | end_sequence (); | |
6776 | emit_insns (insns); | |
6777 | ||
6778 | return target; | |
6779 | ||
6780 | /* __builtin_apply_args returns block of memory allocated on | |
6781 | the stack into which is stored the arg pointer, structure | |
6782 | value address, static chain, and all the registers that might | |
6783 | possibly be used in performing a function call. The code is | |
6784 | moved to the start of the function so the incoming values are | |
6785 | saved. */ | |
6786 | case BUILT_IN_APPLY_ARGS: | |
6787 | /* Don't do __builtin_apply_args more than once in a function. | |
6788 | Save the result of the first call and reuse it. */ | |
6789 | if (apply_args_value != 0) | |
6790 | return apply_args_value; | |
6791 | { | |
6792 | /* When this function is called, it means that registers must be | |
6793 | saved on entry to this function. So we migrate the | |
6794 | call to the first insn of this function. */ | |
6795 | rtx temp; | |
6796 | rtx seq; | |
6797 | ||
6798 | start_sequence (); | |
6799 | temp = expand_builtin_apply_args (); | |
6800 | seq = get_insns (); | |
6801 | end_sequence (); | |
6802 | ||
6803 | apply_args_value = temp; | |
6804 | ||
6805 | /* Put the sequence after the NOTE that starts the function. | |
6806 | If this is inside a SEQUENCE, make the outer-level insn | |
6807 | chain current, so the code is placed at the start of the | |
6808 | function. */ | |
6809 | push_topmost_sequence (); | |
6810 | emit_insns_before (seq, NEXT_INSN (get_insns ())); | |
6811 | pop_topmost_sequence (); | |
6812 | return temp; | |
6813 | } | |
6814 | ||
6815 | /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes | |
6816 | FUNCTION with a copy of the parameters described by | |
6817 | ARGUMENTS, and ARGSIZE. It returns a block of memory | |
6818 | allocated on the stack into which is stored all the registers | |
6819 | that might possibly be used for returning the result of a | |
6820 | function. ARGUMENTS is the value returned by | |
6821 | __builtin_apply_args. ARGSIZE is the number of bytes of | |
6822 | arguments that must be copied. ??? How should this value be | |
6823 | computed? We'll also need a safe worst case value for varargs | |
6824 | functions. */ | |
6825 | case BUILT_IN_APPLY: | |
6826 | if (arglist == 0 | |
6827 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ | |
6828 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE | |
6829 | || TREE_CHAIN (arglist) == 0 | |
6830 | || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE | |
6831 | || TREE_CHAIN (TREE_CHAIN (arglist)) == 0 | |
6832 | || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE) | |
6833 | return const0_rtx; | |
6834 | else | |
6835 | { | |
6836 | int i; | |
6837 | tree t; | |
6838 | rtx ops[3]; | |
6839 | ||
6840 | for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++) | |
6841 | ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0); | |
6842 | ||
6843 | return expand_builtin_apply (ops[0], ops[1], ops[2]); | |
6844 | } | |
6845 | ||
6846 | /* __builtin_return (RESULT) causes the function to return the | |
6847 | value described by RESULT. RESULT is address of the block of | |
6848 | memory returned by __builtin_apply. */ | |
6849 | case BUILT_IN_RETURN: | |
6850 | if (arglist | |
6851 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ | |
6852 | && TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) == POINTER_TYPE) | |
6853 | expand_builtin_return (expand_expr (TREE_VALUE (arglist), | |
6854 | NULL_RTX, VOIDmode, 0)); | |
6855 | return const0_rtx; | |
6856 | ||
6857 | case BUILT_IN_SAVEREGS: | |
6858 | /* Don't do __builtin_saveregs more than once in a function. | |
6859 | Save the result of the first call and reuse it. */ | |
6860 | if (saveregs_value != 0) | |
6861 | return saveregs_value; | |
6862 | { | |
6863 | /* When this function is called, it means that registers must be | |
6864 | saved on entry to this function. So we migrate the | |
6865 | call to the first insn of this function. */ | |
6866 | rtx temp; | |
6867 | rtx seq; | |
ca695ac9 JB |
6868 | |
6869 | /* Now really call the function. `expand_call' does not call | |
6870 | expand_builtin, so there is no danger of infinite recursion here. */ | |
6871 | start_sequence (); | |
6872 | ||
6873 | #ifdef EXPAND_BUILTIN_SAVEREGS | |
6874 | /* Do whatever the machine needs done in this case. */ | |
6875 | temp = EXPAND_BUILTIN_SAVEREGS (arglist); | |
6876 | #else | |
6877 | /* The register where the function returns its value | |
6878 | is likely to have something else in it, such as an argument. | |
6879 | So preserve that register around the call. */ | |
d0c76654 | 6880 | |
ca695ac9 JB |
6881 | if (value_mode != VOIDmode) |
6882 | { | |
d0c76654 RK |
6883 | rtx valreg = hard_libcall_value (value_mode); |
6884 | rtx saved_valreg = gen_reg_rtx (value_mode); | |
6885 | ||
ca695ac9 | 6886 | emit_move_insn (saved_valreg, valreg); |
d0c76654 RK |
6887 | temp = expand_call (exp, target, ignore); |
6888 | emit_move_insn (valreg, saved_valreg); | |
ca695ac9 | 6889 | } |
d0c76654 RK |
6890 | else |
6891 | /* Generate the call, putting the value in a pseudo. */ | |
6892 | temp = expand_call (exp, target, ignore); | |
ca695ac9 JB |
6893 | #endif |
6894 | ||
6895 | seq = get_insns (); | |
6896 | end_sequence (); | |
6897 | ||
6898 | saveregs_value = temp; | |
6899 | ||
6900 | /* Put the sequence after the NOTE that starts the function. | |
6901 | If this is inside a SEQUENCE, make the outer-level insn | |
6902 | chain current, so the code is placed at the start of the | |
6903 | function. */ | |
6904 | push_topmost_sequence (); | |
6905 | emit_insns_before (seq, NEXT_INSN (get_insns ())); | |
6906 | pop_topmost_sequence (); | |
6907 | return temp; | |
6908 | } | |
6909 | ||
6910 | /* __builtin_args_info (N) returns word N of the arg space info | |
6911 | for the current function. The number and meanings of words | |
6912 | is controlled by the definition of CUMULATIVE_ARGS. */ | |
6913 | case BUILT_IN_ARGS_INFO: | |
6914 | { | |
6915 | int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int); | |
6916 | int i; | |
6917 | int *word_ptr = (int *) ¤t_function_args_info; | |
6918 | tree type, elts, result; | |
6919 | ||
6920 | if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0) | |
6921 | fatal ("CUMULATIVE_ARGS type defined badly; see %s, line %d", | |
6922 | __FILE__, __LINE__); | |
6923 | ||
6924 | if (arglist != 0) | |
6925 | { | |
6926 | tree arg = TREE_VALUE (arglist); | |
6927 | if (TREE_CODE (arg) != INTEGER_CST) | |
6928 | error ("argument of `__builtin_args_info' must be constant"); | |
6929 | else | |
6930 | { | |
6931 | int wordnum = TREE_INT_CST_LOW (arg); | |
6932 | ||
6933 | if (wordnum < 0 || wordnum >= nwords || TREE_INT_CST_HIGH (arg)) | |
6934 | error ("argument of `__builtin_args_info' out of range"); | |
6935 | else | |
6936 | return GEN_INT (word_ptr[wordnum]); | |
6937 | } | |
6938 | } | |
6939 | else | |
6940 | error ("missing argument in `__builtin_args_info'"); | |
6941 | ||
6942 | return const0_rtx; | |
6943 | ||
6944 | #if 0 | |
6945 | for (i = 0; i < nwords; i++) | |
6946 | elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0)); | |
6947 | ||
6948 | type = build_array_type (integer_type_node, | |
6949 | build_index_type (build_int_2 (nwords, 0))); | |
6950 | result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts)); | |
6951 | TREE_CONSTANT (result) = 1; | |
6952 | TREE_STATIC (result) = 1; | |
6953 | result = build (INDIRECT_REF, build_pointer_type (type), result); | |
6954 | TREE_CONSTANT (result) = 1; | |
6955 | return expand_expr (result, NULL_RTX, VOIDmode, 0); | |
6956 | #endif | |
6957 | } | |
6958 | ||
c4dfe0fc JW |
6959 | /* Return the address of the first anonymous stack arg. |
6960 | This should only be used for stdarg functions. */ | |
ca695ac9 JB |
6961 | case BUILT_IN_NEXT_ARG: |
6962 | { | |
6963 | tree fntype = TREE_TYPE (current_function_decl); | |
c4dfe0fc JW |
6964 | tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl)); |
6965 | tree arg; | |
6966 | ||
6967 | if (TYPE_ARG_TYPES (fntype) == 0 | |
6968 | || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype))) | |
6969 | == void_type_node)) | |
ca695ac9 JB |
6970 | { |
6971 | error ("`va_start' used in function with fixed args"); | |
6972 | return const0_rtx; | |
6973 | } | |
c4dfe0fc JW |
6974 | |
6975 | arg = TREE_VALUE (arglist); | |
6976 | /* Strip off all nops for the sake of the comparison. This is not | |
6977 | quite the same as STRIP_NOPS. It does more. */ | |
6978 | while (TREE_CODE (arg) == NOP_EXPR | |
6979 | || TREE_CODE (arg) == CONVERT_EXPR | |
6980 | || TREE_CODE (arg) == NON_LVALUE_EXPR) | |
6981 | arg = TREE_OPERAND (arg, 0); | |
6982 | if (arg != last_parm) | |
6983 | warning ("second parameter of `va_start' not last named argument"); | |
ca695ac9 JB |
6984 | } |
6985 | ||
6986 | return expand_binop (Pmode, add_optab, | |
6987 | current_function_internal_arg_pointer, | |
6988 | current_function_arg_offset_rtx, | |
6989 | NULL_RTX, 0, OPTAB_LIB_WIDEN); | |
6990 | ||
6991 | case BUILT_IN_CLASSIFY_TYPE: | |
6992 | if (arglist != 0) | |
6993 | { | |
6994 | tree type = TREE_TYPE (TREE_VALUE (arglist)); | |
6995 | enum tree_code code = TREE_CODE (type); | |
6996 | if (code == VOID_TYPE) | |
6997 | return GEN_INT (void_type_class); | |
6998 | if (code == INTEGER_TYPE) | |
6999 | return GEN_INT (integer_type_class); | |
7000 | if (code == CHAR_TYPE) | |
7001 | return GEN_INT (char_type_class); | |
7002 | if (code == ENUMERAL_TYPE) | |
7003 | return GEN_INT (enumeral_type_class); | |
7004 | if (code == BOOLEAN_TYPE) | |
7005 | return GEN_INT (boolean_type_class); | |
7006 | if (code == POINTER_TYPE) | |
7007 | return GEN_INT (pointer_type_class); | |
7008 | if (code == REFERENCE_TYPE) | |
7009 | return GEN_INT (reference_type_class); | |
7010 | if (code == OFFSET_TYPE) | |
7011 | return GEN_INT (offset_type_class); | |
7012 | if (code == REAL_TYPE) | |
7013 | return GEN_INT (real_type_class); | |
7014 | if (code == COMPLEX_TYPE) | |
7015 | return GEN_INT (complex_type_class); | |
7016 | if (code == FUNCTION_TYPE) | |
7017 | return GEN_INT (function_type_class); | |
7018 | if (code == METHOD_TYPE) | |
7019 | return GEN_INT (method_type_class); | |
7020 | if (code == RECORD_TYPE) | |
7021 | return GEN_INT (record_type_class); | |
7022 | if (code == UNION_TYPE || code == QUAL_UNION_TYPE) | |
7023 | return GEN_INT (union_type_class); | |
7024 | if (code == ARRAY_TYPE) | |
4042d440 PB |
7025 | { |
7026 | if (TYPE_STRING_FLAG (type)) | |
7027 | return GEN_INT (string_type_class); | |
7028 | else | |
7029 | return GEN_INT (array_type_class); | |
7030 | } | |
ca695ac9 JB |
7031 | if (code == SET_TYPE) |
7032 | return GEN_INT (set_type_class); | |
7033 | if (code == FILE_TYPE) | |
7034 | return GEN_INT (file_type_class); | |
7035 | if (code == LANG_TYPE) | |
7036 | return GEN_INT (lang_type_class); | |
7037 | } | |
7038 | return GEN_INT (no_type_class); | |
7039 | ||
7040 | case BUILT_IN_CONSTANT_P: | |
7041 | if (arglist == 0) | |
7042 | return const0_rtx; | |
7043 | else | |
7044 | return (TREE_CODE_CLASS (TREE_CODE (TREE_VALUE (arglist))) == 'c' | |
7045 | ? const1_rtx : const0_rtx); | |
7046 | ||
7047 | case BUILT_IN_FRAME_ADDRESS: | |
7048 | /* The argument must be a nonnegative integer constant. | |
7049 | It counts the number of frames to scan up the stack. | |
7050 | The value is the address of that frame. */ | |
7051 | case BUILT_IN_RETURN_ADDRESS: | |
7052 | /* The argument must be a nonnegative integer constant. | |
7053 | It counts the number of frames to scan up the stack. | |
7054 | The value is the return address saved in that frame. */ | |
7055 | if (arglist == 0) | |
7056 | /* Warning about missing arg was already issued. */ | |
7057 | return const0_rtx; | |
7058 | else if (TREE_CODE (TREE_VALUE (arglist)) != INTEGER_CST) | |
7059 | { | |
7060 | error ("invalid arg to `__builtin_return_address'"); | |
7061 | return const0_rtx; | |
7062 | } | |
153c149b | 7063 | else if (tree_int_cst_sgn (TREE_VALUE (arglist)) < 0) |
ca695ac9 JB |
7064 | { |
7065 | error ("invalid arg to `__builtin_return_address'"); | |
7066 | return const0_rtx; | |
7067 | } | |
7068 | else | |
7069 | { | |
7070 | int count = TREE_INT_CST_LOW (TREE_VALUE (arglist)); | |
7071 | rtx tem = frame_pointer_rtx; | |
7072 | int i; | |
7073 | ||
7074 | /* Some machines need special handling before we can access arbitrary | |
7075 | frames. For example, on the sparc, we must first flush all | |
7076 | register windows to the stack. */ | |
7077 | #ifdef SETUP_FRAME_ADDRESSES | |
7078 | SETUP_FRAME_ADDRESSES (); | |
7079 | #endif | |
7080 | ||
7081 | /* On the sparc, the return address is not in the frame, it is | |
7082 | in a register. There is no way to access it off of the current | |
7083 | frame pointer, but it can be accessed off the previous frame | |
7084 | pointer by reading the value from the register window save | |
7085 | area. */ | |
7086 | #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME | |
7087 | if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_RETURN_ADDRESS) | |
7088 | count--; | |
7089 | #endif | |
7090 | ||
7091 | /* Scan back COUNT frames to the specified frame. */ | |
7092 | for (i = 0; i < count; i++) | |
7093 | { | |
7094 | /* Assume the dynamic chain pointer is in the word that | |
7095 | the frame address points to, unless otherwise specified. */ | |
7096 | #ifdef DYNAMIC_CHAIN_ADDRESS | |
7097 | tem = DYNAMIC_CHAIN_ADDRESS (tem); | |
7098 | #endif | |
7099 | tem = memory_address (Pmode, tem); | |
7100 | tem = copy_to_reg (gen_rtx (MEM, Pmode, tem)); | |
7101 | } | |
7102 | ||
7103 | /* For __builtin_frame_address, return what we've got. */ | |
7104 | if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS) | |
7105 | return tem; | |
7106 | ||
7107 | /* For __builtin_return_address, | |
7108 | Get the return address from that frame. */ | |
7109 | #ifdef RETURN_ADDR_RTX | |
7110 | return RETURN_ADDR_RTX (count, tem); | |
7111 | #else | |
7112 | tem = memory_address (Pmode, | |
7113 | plus_constant (tem, GET_MODE_SIZE (Pmode))); | |
7114 | return copy_to_reg (gen_rtx (MEM, Pmode, tem)); | |
7115 | #endif | |
7116 | } | |
7117 | ||
7118 | case BUILT_IN_ALLOCA: | |
7119 | if (arglist == 0 | |
7120 | /* Arg could be non-integer if user redeclared this fcn wrong. */ | |
7121 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE) | |
7b073ca6 | 7122 | break; |
ca695ac9 JB |
7123 | current_function_calls_alloca = 1; |
7124 | /* Compute the argument. */ | |
7125 | op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0); | |
7126 | ||
7127 | /* Allocate the desired space. */ | |
7128 | target = allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT); | |
7129 | ||
7130 | /* Record the new stack level for nonlocal gotos. */ | |
7131 | if (nonlocal_goto_handler_slot != 0) | |
7132 | emit_stack_save (SAVE_NONLOCAL, &nonlocal_goto_stack_level, NULL_RTX); | |
7133 | return target; | |
7134 | ||
7135 | case BUILT_IN_FFS: | |
7136 | /* If not optimizing, call the library function. */ | |
98aad286 | 7137 | if (!optimize && ! CALLED_AS_BUILT_IN (fndecl)) |
ca695ac9 JB |
7138 | break; |
7139 | ||
7140 | if (arglist == 0 | |
7141 | /* Arg could be non-integer if user redeclared this fcn wrong. */ | |
7142 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE) | |
7b073ca6 | 7143 | break; |
ca695ac9 JB |
7144 | |
7145 | /* Compute the argument. */ | |
7146 | op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0); | |
7147 | /* Compute ffs, into TARGET if possible. | |
7148 | Set TARGET to wherever the result comes back. */ | |
7149 | target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))), | |
7150 | ffs_optab, op0, target, 1); | |
7151 | if (target == 0) | |
7152 | abort (); | |
7153 | return target; | |
7154 | ||
7155 | case BUILT_IN_STRLEN: | |
7156 | /* If not optimizing, call the library function. */ | |
98aad286 | 7157 | if (!optimize && ! CALLED_AS_BUILT_IN (fndecl)) |
ca695ac9 JB |
7158 | break; |
7159 | ||
7160 | if (arglist == 0 | |
7161 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ | |
7162 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE) | |
7b073ca6 | 7163 | break; |
ca695ac9 JB |
7164 | else |
7165 | { | |
7166 | tree src = TREE_VALUE (arglist); | |
7167 | tree len = c_strlen (src); | |
7168 | ||
7169 | int align | |
7170 | = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT; | |
7171 | ||
7172 | rtx result, src_rtx, char_rtx; | |
7173 | enum machine_mode insn_mode = value_mode, char_mode; | |
7174 | enum insn_code icode; | |
7175 | ||
7176 | /* If the length is known, just return it. */ | |
7177 | if (len != 0) | |
7178 | return expand_expr (len, target, mode, 0); | |
7179 | ||
7180 | /* If SRC is not a pointer type, don't do this operation inline. */ | |
7181 | if (align == 0) | |
7182 | break; | |
7183 | ||
7184 | /* Call a function if we can't compute strlen in the right mode. */ | |
7185 | ||
7186 | while (insn_mode != VOIDmode) | |
7187 | { | |
7188 | icode = strlen_optab->handlers[(int) insn_mode].insn_code; | |
7189 | if (icode != CODE_FOR_nothing) | |
7190 | break; | |
bbf6f052 | 7191 | |
ca695ac9 JB |
7192 | insn_mode = GET_MODE_WIDER_MODE (insn_mode); |
7193 | } | |
7194 | if (insn_mode == VOIDmode) | |
7195 | break; | |
bbf6f052 | 7196 | |
ca695ac9 JB |
7197 | /* Make a place to write the result of the instruction. */ |
7198 | result = target; | |
7199 | if (! (result != 0 | |
7200 | && GET_CODE (result) == REG | |
7201 | && GET_MODE (result) == insn_mode | |
7202 | && REGNO (result) >= FIRST_PSEUDO_REGISTER)) | |
7203 | result = gen_reg_rtx (insn_mode); | |
bbf6f052 | 7204 | |
ca695ac9 JB |
7205 | /* Make sure the operands are acceptable to the predicates. */ |
7206 | ||
7207 | if (! (*insn_operand_predicate[(int)icode][0]) (result, insn_mode)) | |
7208 | result = gen_reg_rtx (insn_mode); | |
7209 | ||
7210 | src_rtx = memory_address (BLKmode, | |
7211 | expand_expr (src, NULL_RTX, Pmode, | |
7212 | EXPAND_NORMAL)); | |
7213 | if (! (*insn_operand_predicate[(int)icode][1]) (src_rtx, Pmode)) | |
7214 | src_rtx = copy_to_mode_reg (Pmode, src_rtx); | |
7215 | ||
7216 | char_rtx = const0_rtx; | |
7217 | char_mode = insn_operand_mode[(int)icode][2]; | |
7218 | if (! (*insn_operand_predicate[(int)icode][2]) (char_rtx, char_mode)) | |
7219 | char_rtx = copy_to_mode_reg (char_mode, char_rtx); | |
7220 | ||
7221 | emit_insn (GEN_FCN (icode) (result, | |
7222 | gen_rtx (MEM, BLKmode, src_rtx), | |
7223 | char_rtx, GEN_INT (align))); | |
7224 | ||
7225 | /* Return the value in the proper mode for this function. */ | |
7226 | if (GET_MODE (result) == value_mode) | |
7227 | return result; | |
7228 | else if (target != 0) | |
7229 | { | |
7230 | convert_move (target, result, 0); | |
7231 | return target; | |
7232 | } | |
7233 | else | |
7234 | return convert_to_mode (value_mode, result, 0); | |
7235 | } | |
7236 | ||
7237 | case BUILT_IN_STRCPY: | |
e87b4f3f | 7238 | /* If not optimizing, call the library function. */ |
98aad286 | 7239 | if (!optimize && ! CALLED_AS_BUILT_IN (fndecl)) |
e87b4f3f RS |
7240 | break; |
7241 | ||
7242 | if (arglist == 0 | |
ca695ac9 JB |
7243 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ |
7244 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE | |
7245 | || TREE_CHAIN (arglist) == 0 | |
7246 | || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE) | |
7b073ca6 | 7247 | break; |
ca695ac9 | 7248 | else |
db0e6d01 | 7249 | { |
ca695ac9 | 7250 | tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist))); |
e7c33f54 | 7251 | |
ca695ac9 JB |
7252 | if (len == 0) |
7253 | break; | |
e7c33f54 | 7254 | |
ca695ac9 | 7255 | len = size_binop (PLUS_EXPR, len, integer_one_node); |
e7c33f54 | 7256 | |
ca695ac9 | 7257 | chainon (arglist, build_tree_list (NULL_TREE, len)); |
1bbddf11 JVA |
7258 | } |
7259 | ||
ca695ac9 JB |
7260 | /* Drops in. */ |
7261 | case BUILT_IN_MEMCPY: | |
7262 | /* If not optimizing, call the library function. */ | |
98aad286 | 7263 | if (!optimize && ! CALLED_AS_BUILT_IN (fndecl)) |
ca695ac9 | 7264 | break; |
e7c33f54 | 7265 | |
ca695ac9 JB |
7266 | if (arglist == 0 |
7267 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ | |
7268 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE | |
7269 | || TREE_CHAIN (arglist) == 0 | |
7270 | || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE | |
7271 | || TREE_CHAIN (TREE_CHAIN (arglist)) == 0 | |
7272 | || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE) | |
7b073ca6 | 7273 | break; |
ca695ac9 | 7274 | else |
e7c33f54 | 7275 | { |
ca695ac9 JB |
7276 | tree dest = TREE_VALUE (arglist); |
7277 | tree src = TREE_VALUE (TREE_CHAIN (arglist)); | |
7278 | tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))); | |
e87b4f3f | 7279 | |
ca695ac9 JB |
7280 | int src_align |
7281 | = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT; | |
7282 | int dest_align | |
7283 | = get_pointer_alignment (dest, BIGGEST_ALIGNMENT) / BITS_PER_UNIT; | |
7284 | rtx dest_rtx, dest_mem, src_mem; | |
60bac6ea | 7285 | |
ca695ac9 JB |
7286 | /* If either SRC or DEST is not a pointer type, don't do |
7287 | this operation in-line. */ | |
7288 | if (src_align == 0 || dest_align == 0) | |
7289 | { | |
7290 | if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_STRCPY) | |
7291 | TREE_CHAIN (TREE_CHAIN (arglist)) = 0; | |
7292 | break; | |
7293 | } | |
7294 | ||
7295 | dest_rtx = expand_expr (dest, NULL_RTX, Pmode, EXPAND_NORMAL); | |
7296 | dest_mem = gen_rtx (MEM, BLKmode, | |
7297 | memory_address (BLKmode, dest_rtx)); | |
7298 | src_mem = gen_rtx (MEM, BLKmode, | |
7299 | memory_address (BLKmode, | |
7300 | expand_expr (src, NULL_RTX, | |
7301 | Pmode, | |
7302 | EXPAND_NORMAL))); | |
7303 | ||
7304 | /* Copy word part most expediently. */ | |
7305 | emit_block_move (dest_mem, src_mem, | |
7306 | expand_expr (len, NULL_RTX, VOIDmode, 0), | |
7307 | MIN (src_align, dest_align)); | |
7308 | return dest_rtx; | |
7309 | } | |
7310 | ||
7311 | /* These comparison functions need an instruction that returns an actual | |
7312 | index. An ordinary compare that just sets the condition codes | |
7313 | is not enough. */ | |
7314 | #ifdef HAVE_cmpstrsi | |
7315 | case BUILT_IN_STRCMP: | |
7316 | /* If not optimizing, call the library function. */ | |
98aad286 | 7317 | if (!optimize && ! CALLED_AS_BUILT_IN (fndecl)) |
ca695ac9 JB |
7318 | break; |
7319 | ||
7320 | if (arglist == 0 | |
7321 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ | |
7322 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE | |
7323 | || TREE_CHAIN (arglist) == 0 | |
7324 | || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE) | |
7b073ca6 | 7325 | break; |
ca695ac9 JB |
7326 | else if (!HAVE_cmpstrsi) |
7327 | break; | |
7328 | { | |
7329 | tree arg1 = TREE_VALUE (arglist); | |
7330 | tree arg2 = TREE_VALUE (TREE_CHAIN (arglist)); | |
7331 | tree offset; | |
7332 | tree len, len2; | |
7333 | ||
7334 | len = c_strlen (arg1); | |
7335 | if (len) | |
7336 | len = size_binop (PLUS_EXPR, integer_one_node, len); | |
7337 | len2 = c_strlen (arg2); | |
7338 | if (len2) | |
7339 | len2 = size_binop (PLUS_EXPR, integer_one_node, len2); | |
7340 | ||
7341 | /* If we don't have a constant length for the first, use the length | |
7342 | of the second, if we know it. We don't require a constant for | |
7343 | this case; some cost analysis could be done if both are available | |
7344 | but neither is constant. For now, assume they're equally cheap. | |
7345 | ||
7346 | If both strings have constant lengths, use the smaller. This | |
7347 | could arise if optimization results in strcpy being called with | |
7348 | two fixed strings, or if the code was machine-generated. We should | |
7349 | add some code to the `memcmp' handler below to deal with such | |
7350 | situations, someday. */ | |
7351 | if (!len || TREE_CODE (len) != INTEGER_CST) | |
7352 | { | |
7353 | if (len2) | |
7354 | len = len2; | |
7355 | else if (len == 0) | |
7356 | break; | |
7357 | } | |
7358 | else if (len2 && TREE_CODE (len2) == INTEGER_CST) | |
7359 | { | |
7360 | if (tree_int_cst_lt (len2, len)) | |
7361 | len = len2; | |
7362 | } | |
7363 | ||
7364 | chainon (arglist, build_tree_list (NULL_TREE, len)); | |
7365 | } | |
7366 | ||
7367 | /* Drops in. */ | |
7368 | case BUILT_IN_MEMCMP: | |
7369 | /* If not optimizing, call the library function. */ | |
98aad286 | 7370 | if (!optimize && ! CALLED_AS_BUILT_IN (fndecl)) |
ca695ac9 JB |
7371 | break; |
7372 | ||
7373 | if (arglist == 0 | |
7374 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ | |
7375 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE | |
7376 | || TREE_CHAIN (arglist) == 0 | |
7377 | || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE | |
7378 | || TREE_CHAIN (TREE_CHAIN (arglist)) == 0 | |
7379 | || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE) | |
7b073ca6 | 7380 | break; |
ca695ac9 JB |
7381 | else if (!HAVE_cmpstrsi) |
7382 | break; | |
7383 | { | |
7384 | tree arg1 = TREE_VALUE (arglist); | |
7385 | tree arg2 = TREE_VALUE (TREE_CHAIN (arglist)); | |
7386 | tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))); | |
7387 | rtx result; | |
7388 | ||
7389 | int arg1_align | |
7390 | = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT; | |
7391 | int arg2_align | |
7392 | = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT; | |
7393 | enum machine_mode insn_mode | |
7394 | = insn_operand_mode[(int) CODE_FOR_cmpstrsi][0]; | |
60bac6ea | 7395 | |
ca695ac9 JB |
7396 | /* If we don't have POINTER_TYPE, call the function. */ |
7397 | if (arg1_align == 0 || arg2_align == 0) | |
7398 | { | |
7399 | if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_STRCMP) | |
7400 | TREE_CHAIN (TREE_CHAIN (arglist)) = 0; | |
7401 | break; | |
7402 | } | |
60bac6ea | 7403 | |
ca695ac9 JB |
7404 | /* Make a place to write the result of the instruction. */ |
7405 | result = target; | |
7406 | if (! (result != 0 | |
7407 | && GET_CODE (result) == REG && GET_MODE (result) == insn_mode | |
7408 | && REGNO (result) >= FIRST_PSEUDO_REGISTER)) | |
7409 | result = gen_reg_rtx (insn_mode); | |
60bac6ea | 7410 | |
ca695ac9 JB |
7411 | emit_insn (gen_cmpstrsi (result, |
7412 | gen_rtx (MEM, BLKmode, | |
7413 | expand_expr (arg1, NULL_RTX, Pmode, | |
7414 | EXPAND_NORMAL)), | |
7415 | gen_rtx (MEM, BLKmode, | |
7416 | expand_expr (arg2, NULL_RTX, Pmode, | |
7417 | EXPAND_NORMAL)), | |
7418 | expand_expr (len, NULL_RTX, VOIDmode, 0), | |
7419 | GEN_INT (MIN (arg1_align, arg2_align)))); | |
60bac6ea | 7420 | |
ca695ac9 JB |
7421 | /* Return the value in the proper mode for this function. */ |
7422 | mode = TYPE_MODE (TREE_TYPE (exp)); | |
7423 | if (GET_MODE (result) == mode) | |
7424 | return result; | |
7425 | else if (target != 0) | |
7426 | { | |
7427 | convert_move (target, result, 0); | |
7428 | return target; | |
60bac6ea | 7429 | } |
ca695ac9 JB |
7430 | else |
7431 | return convert_to_mode (mode, result, 0); | |
7432 | } | |
60bac6ea | 7433 | #else |
ca695ac9 JB |
7434 | case BUILT_IN_STRCMP: |
7435 | case BUILT_IN_MEMCMP: | |
7436 | break; | |
60bac6ea RS |
7437 | #endif |
7438 | ||
ca695ac9 JB |
7439 | default: /* just do library call, if unknown builtin */ |
7440 | error ("built-in function `%s' not currently supported", | |
7441 | IDENTIFIER_POINTER (DECL_NAME (fndecl))); | |
7442 | } | |
e87b4f3f | 7443 | |
ca695ac9 JB |
7444 | /* The switch statement above can drop through to cause the function |
7445 | to be called normally. */ | |
e7c33f54 | 7446 | |
ca695ac9 JB |
7447 | return expand_call (exp, target, ignore); |
7448 | } | |
7449 | \f | |
7450 | /* Built-in functions to perform an untyped call and return. */ | |
0006469d | 7451 | |
ca695ac9 JB |
7452 | /* For each register that may be used for calling a function, this |
7453 | gives a mode used to copy the register's value. VOIDmode indicates | |
7454 | the register is not used for calling a function. If the machine | |
7455 | has register windows, this gives only the outbound registers. | |
7456 | INCOMING_REGNO gives the corresponding inbound register. */ | |
7457 | static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER]; | |
0006469d | 7458 | |
ca695ac9 JB |
7459 | /* For each register that may be used for returning values, this gives |
7460 | a mode used to copy the register's value. VOIDmode indicates the | |
7461 | register is not used for returning values. If the machine has | |
7462 | register windows, this gives only the outbound registers. | |
7463 | INCOMING_REGNO gives the corresponding inbound register. */ | |
7464 | static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER]; | |
0006469d | 7465 | |
ca695ac9 JB |
7466 | /* For each register that may be used for calling a function, this |
7467 | gives the offset of that register into the block returned by | |
7468 | __bultin_apply_args. 0 indicates that the register is not | |
7469 | used for calling a function. */ | |
7470 | static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER]; | |
0006469d | 7471 | |
ca695ac9 JB |
7472 | /* Return the offset of register REGNO into the block returned by |
7473 | __builtin_apply_args. This is not declared static, since it is | |
7474 | needed in objc-act.c. */ | |
0006469d | 7475 | |
ca695ac9 JB |
7476 | int |
7477 | apply_args_register_offset (regno) | |
7478 | int regno; | |
7479 | { | |
7480 | apply_args_size (); | |
0006469d | 7481 | |
ca695ac9 JB |
7482 | /* Arguments are always put in outgoing registers (in the argument |
7483 | block) if such make sense. */ | |
7484 | #ifdef OUTGOING_REGNO | |
7485 | regno = OUTGOING_REGNO(regno); | |
7486 | #endif | |
7487 | return apply_args_reg_offset[regno]; | |
7488 | } | |
0006469d | 7489 | |
ca695ac9 JB |
7490 | /* Return the size required for the block returned by __builtin_apply_args, |
7491 | and initialize apply_args_mode. */ | |
0006469d | 7492 | |
ca695ac9 JB |
7493 | static int |
7494 | apply_args_size () | |
7495 | { | |
7496 | static int size = -1; | |
7497 | int align, regno; | |
7498 | enum machine_mode mode; | |
bbf6f052 | 7499 | |
ca695ac9 JB |
7500 | /* The values computed by this function never change. */ |
7501 | if (size < 0) | |
7502 | { | |
7503 | /* The first value is the incoming arg-pointer. */ | |
7504 | size = GET_MODE_SIZE (Pmode); | |
bbf6f052 | 7505 | |
ca695ac9 JB |
7506 | /* The second value is the structure value address unless this is |
7507 | passed as an "invisible" first argument. */ | |
7508 | if (struct_value_rtx) | |
7509 | size += GET_MODE_SIZE (Pmode); | |
7510 | ||
7511 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
7512 | if (FUNCTION_ARG_REGNO_P (regno)) | |
bbf6f052 | 7513 | { |
ca695ac9 JB |
7514 | /* Search for the proper mode for copying this register's |
7515 | value. I'm not sure this is right, but it works so far. */ | |
7516 | enum machine_mode best_mode = VOIDmode; | |
7517 | ||
7518 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); | |
7519 | mode != VOIDmode; | |
7520 | mode = GET_MODE_WIDER_MODE (mode)) | |
7521 | if (HARD_REGNO_MODE_OK (regno, mode) | |
7522 | && HARD_REGNO_NREGS (regno, mode) == 1) | |
7523 | best_mode = mode; | |
7524 | ||
7525 | if (best_mode == VOIDmode) | |
7526 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); | |
7527 | mode != VOIDmode; | |
7528 | mode = GET_MODE_WIDER_MODE (mode)) | |
7529 | if (HARD_REGNO_MODE_OK (regno, mode) | |
7530 | && (mov_optab->handlers[(int) mode].insn_code | |
7531 | != CODE_FOR_nothing)) | |
7532 | best_mode = mode; | |
7533 | ||
7534 | mode = best_mode; | |
7535 | if (mode == VOIDmode) | |
7536 | abort (); | |
7537 | ||
7538 | align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT; | |
7539 | if (size % align != 0) | |
7540 | size = CEIL (size, align) * align; | |
7541 | apply_args_reg_offset[regno] = size; | |
7542 | size += GET_MODE_SIZE (mode); | |
7543 | apply_args_mode[regno] = mode; | |
7544 | } | |
7545 | else | |
7546 | { | |
7547 | apply_args_mode[regno] = VOIDmode; | |
7548 | apply_args_reg_offset[regno] = 0; | |
bbf6f052 | 7549 | } |
ca695ac9 JB |
7550 | } |
7551 | return size; | |
7552 | } | |
bbf6f052 | 7553 | |
ca695ac9 JB |
7554 | /* Return the size required for the block returned by __builtin_apply, |
7555 | and initialize apply_result_mode. */ | |
bbf6f052 | 7556 | |
ca695ac9 JB |
7557 | static int |
7558 | apply_result_size () | |
7559 | { | |
7560 | static int size = -1; | |
7561 | int align, regno; | |
7562 | enum machine_mode mode; | |
bbf6f052 | 7563 | |
ca695ac9 JB |
7564 | /* The values computed by this function never change. */ |
7565 | if (size < 0) | |
7566 | { | |
7567 | size = 0; | |
bbf6f052 | 7568 | |
ca695ac9 JB |
7569 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) |
7570 | if (FUNCTION_VALUE_REGNO_P (regno)) | |
7571 | { | |
7572 | /* Search for the proper mode for copying this register's | |
7573 | value. I'm not sure this is right, but it works so far. */ | |
7574 | enum machine_mode best_mode = VOIDmode; | |
bbf6f052 | 7575 | |
ca695ac9 JB |
7576 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); |
7577 | mode != TImode; | |
7578 | mode = GET_MODE_WIDER_MODE (mode)) | |
7579 | if (HARD_REGNO_MODE_OK (regno, mode)) | |
7580 | best_mode = mode; | |
bbf6f052 | 7581 | |
ca695ac9 JB |
7582 | if (best_mode == VOIDmode) |
7583 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); | |
7584 | mode != VOIDmode; | |
7585 | mode = GET_MODE_WIDER_MODE (mode)) | |
7586 | if (HARD_REGNO_MODE_OK (regno, mode) | |
7587 | && (mov_optab->handlers[(int) mode].insn_code | |
7588 | != CODE_FOR_nothing)) | |
7589 | best_mode = mode; | |
bbf6f052 | 7590 | |
ca695ac9 JB |
7591 | mode = best_mode; |
7592 | if (mode == VOIDmode) | |
7593 | abort (); | |
bbf6f052 | 7594 | |
ca695ac9 JB |
7595 | align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT; |
7596 | if (size % align != 0) | |
7597 | size = CEIL (size, align) * align; | |
7598 | size += GET_MODE_SIZE (mode); | |
7599 | apply_result_mode[regno] = mode; | |
bbf6f052 RK |
7600 | } |
7601 | else | |
ca695ac9 | 7602 | apply_result_mode[regno] = VOIDmode; |
bbf6f052 | 7603 | |
ca695ac9 JB |
7604 | /* Allow targets that use untyped_call and untyped_return to override |
7605 | the size so that machine-specific information can be stored here. */ | |
7606 | #ifdef APPLY_RESULT_SIZE | |
7607 | size = APPLY_RESULT_SIZE; | |
7608 | #endif | |
7609 | } | |
7610 | return size; | |
7611 | } | |
bbf6f052 | 7612 | |
ca695ac9 JB |
7613 | #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return) |
7614 | /* Create a vector describing the result block RESULT. If SAVEP is true, | |
7615 | the result block is used to save the values; otherwise it is used to | |
7616 | restore the values. */ | |
bbf6f052 | 7617 | |
ca695ac9 JB |
7618 | static rtx |
7619 | result_vector (savep, result) | |
7620 | int savep; | |
7621 | rtx result; | |
7622 | { | |
7623 | int regno, size, align, nelts; | |
7624 | enum machine_mode mode; | |
7625 | rtx reg, mem; | |
7626 | rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx)); | |
7627 | ||
7628 | size = nelts = 0; | |
7629 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
7630 | if ((mode = apply_result_mode[regno]) != VOIDmode) | |
7631 | { | |
7632 | align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT; | |
7633 | if (size % align != 0) | |
7634 | size = CEIL (size, align) * align; | |
7635 | reg = gen_rtx (REG, mode, savep ? INCOMING_REGNO (regno) : regno); | |
7636 | mem = change_address (result, mode, | |
7637 | plus_constant (XEXP (result, 0), size)); | |
7638 | savevec[nelts++] = (savep | |
7639 | ? gen_rtx (SET, VOIDmode, mem, reg) | |
7640 | : gen_rtx (SET, VOIDmode, reg, mem)); | |
7641 | size += GET_MODE_SIZE (mode); | |
bbf6f052 | 7642 | } |
ca695ac9 JB |
7643 | return gen_rtx (PARALLEL, VOIDmode, gen_rtvec_v (nelts, savevec)); |
7644 | } | |
7645 | #endif /* HAVE_untyped_call or HAVE_untyped_return */ | |
bbf6f052 | 7646 | |
ca695ac9 JB |
7647 | /* Save the state required to perform an untyped call with the same |
7648 | arguments as were passed to the current function. */ | |
7649 | ||
7650 | static rtx | |
7651 | expand_builtin_apply_args () | |
7652 | { | |
7653 | rtx registers; | |
7654 | int size, align, regno; | |
7655 | enum machine_mode mode; | |
7656 | ||
7657 | /* Create a block where the arg-pointer, structure value address, | |
7658 | and argument registers can be saved. */ | |
7659 | registers = assign_stack_local (BLKmode, apply_args_size (), -1); | |
7660 | ||
7661 | /* Walk past the arg-pointer and structure value address. */ | |
7662 | size = GET_MODE_SIZE (Pmode); | |
7663 | if (struct_value_rtx) | |
7664 | size += GET_MODE_SIZE (Pmode); | |
7665 | ||
7666 | /* Save each register used in calling a function to the block. */ | |
7667 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
7668 | if ((mode = apply_args_mode[regno]) != VOIDmode) | |
bbf6f052 | 7669 | { |
ca695ac9 JB |
7670 | align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT; |
7671 | if (size % align != 0) | |
7672 | size = CEIL (size, align) * align; | |
7673 | emit_move_insn (change_address (registers, mode, | |
7674 | plus_constant (XEXP (registers, 0), | |
7675 | size)), | |
7676 | gen_rtx (REG, mode, INCOMING_REGNO (regno))); | |
7677 | size += GET_MODE_SIZE (mode); | |
bbf6f052 RK |
7678 | } |
7679 | ||
ca695ac9 JB |
7680 | /* Save the arg pointer to the block. */ |
7681 | emit_move_insn (change_address (registers, Pmode, XEXP (registers, 0)), | |
7682 | copy_to_reg (virtual_incoming_args_rtx)); | |
7683 | size = GET_MODE_SIZE (Pmode); | |
bbf6f052 | 7684 | |
ca695ac9 JB |
7685 | /* Save the structure value address unless this is passed as an |
7686 | "invisible" first argument. */ | |
7687 | if (struct_value_incoming_rtx) | |
7688 | { | |
7689 | emit_move_insn (change_address (registers, Pmode, | |
7690 | plus_constant (XEXP (registers, 0), | |
7691 | size)), | |
7692 | copy_to_reg (struct_value_incoming_rtx)); | |
7693 | size += GET_MODE_SIZE (Pmode); | |
7694 | } | |
7695 | ||
7696 | /* Return the address of the block. */ | |
7697 | return copy_addr_to_reg (XEXP (registers, 0)); | |
7698 | } | |
7699 | ||
7700 | /* Perform an untyped call and save the state required to perform an | |
7701 | untyped return of whatever value was returned by the given function. */ | |
7702 | ||
7703 | static rtx | |
7704 | expand_builtin_apply (function, arguments, argsize) | |
7705 | rtx function, arguments, argsize; | |
7706 | { | |
7707 | int size, align, regno; | |
7708 | enum machine_mode mode; | |
7709 | rtx incoming_args, result, reg, dest, call_insn; | |
7710 | rtx old_stack_level = 0; | |
7711 | rtx use_insns = 0; | |
bbf6f052 | 7712 | |
ca695ac9 JB |
7713 | /* Create a block where the return registers can be saved. */ |
7714 | result = assign_stack_local (BLKmode, apply_result_size (), -1); | |
bbf6f052 | 7715 | |
ca695ac9 | 7716 | /* ??? The argsize value should be adjusted here. */ |
bbf6f052 | 7717 | |
ca695ac9 JB |
7718 | /* Fetch the arg pointer from the ARGUMENTS block. */ |
7719 | incoming_args = gen_reg_rtx (Pmode); | |
7720 | emit_move_insn (incoming_args, | |
7721 | gen_rtx (MEM, Pmode, arguments)); | |
7722 | #ifndef STACK_GROWS_DOWNWARD | |
7723 | incoming_args = expand_binop (Pmode, sub_optab, incoming_args, argsize, | |
7724 | incoming_args, 0, OPTAB_LIB_WIDEN); | |
46b68a37 JW |
7725 | #endif |
7726 | ||
ca695ac9 JB |
7727 | /* Perform postincrements before actually calling the function. */ |
7728 | emit_queue (); | |
46b68a37 | 7729 | |
ca695ac9 JB |
7730 | /* Push a new argument block and copy the arguments. */ |
7731 | do_pending_stack_adjust (); | |
7732 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
bbf6f052 | 7733 | |
ca695ac9 JB |
7734 | /* Push a block of memory onto the stack to store the memory arguments. |
7735 | Save the address in a register, and copy the memory arguments. ??? I | |
7736 | haven't figured out how the calling convention macros effect this, | |
7737 | but it's likely that the source and/or destination addresses in | |
7738 | the block copy will need updating in machine specific ways. */ | |
7739 | dest = copy_addr_to_reg (push_block (argsize, 0, 0)); | |
7740 | emit_block_move (gen_rtx (MEM, BLKmode, dest), | |
7741 | gen_rtx (MEM, BLKmode, incoming_args), | |
7742 | argsize, | |
7743 | PARM_BOUNDARY / BITS_PER_UNIT); | |
bbf6f052 | 7744 | |
ca695ac9 JB |
7745 | /* Refer to the argument block. */ |
7746 | apply_args_size (); | |
7747 | arguments = gen_rtx (MEM, BLKmode, arguments); | |
7748 | ||
7749 | /* Walk past the arg-pointer and structure value address. */ | |
7750 | size = GET_MODE_SIZE (Pmode); | |
7751 | if (struct_value_rtx) | |
7752 | size += GET_MODE_SIZE (Pmode); | |
7753 | ||
7754 | /* Restore each of the registers previously saved. Make USE insns | |
7755 | for each of these registers for use in making the call. */ | |
7756 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
7757 | if ((mode = apply_args_mode[regno]) != VOIDmode) | |
7758 | { | |
7759 | align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT; | |
7760 | if (size % align != 0) | |
7761 | size = CEIL (size, align) * align; | |
7762 | reg = gen_rtx (REG, mode, regno); | |
7763 | emit_move_insn (reg, | |
7764 | change_address (arguments, mode, | |
7765 | plus_constant (XEXP (arguments, 0), | |
7766 | size))); | |
7767 | ||
7768 | push_to_sequence (use_insns); | |
7769 | emit_insn (gen_rtx (USE, VOIDmode, reg)); | |
7770 | use_insns = get_insns (); | |
7771 | end_sequence (); | |
7772 | size += GET_MODE_SIZE (mode); | |
7773 | } | |
7774 | ||
7775 | /* Restore the structure value address unless this is passed as an | |
7776 | "invisible" first argument. */ | |
7777 | size = GET_MODE_SIZE (Pmode); | |
7778 | if (struct_value_rtx) | |
7779 | { | |
7780 | rtx value = gen_reg_rtx (Pmode); | |
7781 | emit_move_insn (value, | |
7782 | change_address (arguments, Pmode, | |
7783 | plus_constant (XEXP (arguments, 0), | |
7784 | size))); | |
7785 | emit_move_insn (struct_value_rtx, value); | |
7786 | if (GET_CODE (struct_value_rtx) == REG) | |
7787 | { | |
7788 | push_to_sequence (use_insns); | |
7789 | emit_insn (gen_rtx (USE, VOIDmode, struct_value_rtx)); | |
7790 | use_insns = get_insns (); | |
7791 | end_sequence (); | |
bbf6f052 | 7792 | } |
ca695ac9 JB |
7793 | size += GET_MODE_SIZE (Pmode); |
7794 | } | |
bbf6f052 | 7795 | |
ca695ac9 JB |
7796 | /* All arguments and registers used for the call are set up by now! */ |
7797 | function = prepare_call_address (function, NULL_TREE, &use_insns); | |
bbf6f052 | 7798 | |
ca695ac9 JB |
7799 | /* Ensure address is valid. SYMBOL_REF is already valid, so no need, |
7800 | and we don't want to load it into a register as an optimization, | |
7801 | because prepare_call_address already did it if it should be done. */ | |
7802 | if (GET_CODE (function) != SYMBOL_REF) | |
7803 | function = memory_address (FUNCTION_MODE, function); | |
bbf6f052 | 7804 | |
ca695ac9 JB |
7805 | /* Generate the actual call instruction and save the return value. */ |
7806 | #ifdef HAVE_untyped_call | |
7807 | if (HAVE_untyped_call) | |
7808 | emit_call_insn (gen_untyped_call (gen_rtx (MEM, FUNCTION_MODE, function), | |
7809 | result, result_vector (1, result))); | |
7810 | else | |
7811 | #endif | |
7812 | #ifdef HAVE_call_value | |
7813 | if (HAVE_call_value) | |
7814 | { | |
7815 | rtx valreg = 0; | |
bbf6f052 | 7816 | |
ca695ac9 JB |
7817 | /* Locate the unique return register. It is not possible to |
7818 | express a call that sets more than one return register using | |
7819 | call_value; use untyped_call for that. In fact, untyped_call | |
7820 | only needs to save the return registers in the given block. */ | |
7821 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
7822 | if ((mode = apply_result_mode[regno]) != VOIDmode) | |
7823 | { | |
7824 | if (valreg) | |
7825 | abort (); /* HAVE_untyped_call required. */ | |
7826 | valreg = gen_rtx (REG, mode, regno); | |
7827 | } | |
bbf6f052 | 7828 | |
ca695ac9 JB |
7829 | emit_call_insn (gen_call_value (valreg, |
7830 | gen_rtx (MEM, FUNCTION_MODE, function), | |
7831 | const0_rtx, NULL_RTX, const0_rtx)); | |
bbf6f052 | 7832 | |
ca695ac9 JB |
7833 | emit_move_insn (change_address (result, GET_MODE (valreg), |
7834 | XEXP (result, 0)), | |
7835 | valreg); | |
7836 | } | |
7837 | else | |
7838 | #endif | |
7839 | abort (); | |
bbf6f052 | 7840 | |
ca695ac9 JB |
7841 | /* Find the CALL insn we just emitted and write the USE insns before it. */ |
7842 | for (call_insn = get_last_insn (); | |
7843 | call_insn && GET_CODE (call_insn) != CALL_INSN; | |
7844 | call_insn = PREV_INSN (call_insn)) | |
7845 | ; | |
bbf6f052 | 7846 | |
ca695ac9 JB |
7847 | if (! call_insn) |
7848 | abort (); | |
bbf6f052 | 7849 | |
ca695ac9 JB |
7850 | /* Put the USE insns before the CALL. */ |
7851 | emit_insns_before (use_insns, call_insn); | |
e7c33f54 | 7852 | |
ca695ac9 JB |
7853 | /* Restore the stack. */ |
7854 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
e7c33f54 | 7855 | |
ca695ac9 JB |
7856 | /* Return the address of the result block. */ |
7857 | return copy_addr_to_reg (XEXP (result, 0)); | |
7858 | } | |
e7c33f54 | 7859 | |
ca695ac9 | 7860 | /* Perform an untyped return. */ |
e7c33f54 | 7861 | |
ca695ac9 JB |
7862 | static void |
7863 | expand_builtin_return (result) | |
7864 | rtx result; | |
7865 | { | |
7866 | int size, align, regno; | |
7867 | enum machine_mode mode; | |
7868 | rtx reg; | |
7869 | rtx use_insns = 0; | |
e7c33f54 | 7870 | |
ca695ac9 JB |
7871 | apply_result_size (); |
7872 | result = gen_rtx (MEM, BLKmode, result); | |
e7c33f54 | 7873 | |
ca695ac9 JB |
7874 | #ifdef HAVE_untyped_return |
7875 | if (HAVE_untyped_return) | |
7876 | { | |
7877 | emit_jump_insn (gen_untyped_return (result, result_vector (0, result))); | |
7878 | emit_barrier (); | |
7879 | return; | |
7880 | } | |
7881 | #endif | |
e7c33f54 | 7882 | |
ca695ac9 JB |
7883 | /* Restore the return value and note that each value is used. */ |
7884 | size = 0; | |
7885 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
7886 | if ((mode = apply_result_mode[regno]) != VOIDmode) | |
7887 | { | |
7888 | align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT; | |
7889 | if (size % align != 0) | |
7890 | size = CEIL (size, align) * align; | |
7891 | reg = gen_rtx (REG, mode, INCOMING_REGNO (regno)); | |
7892 | emit_move_insn (reg, | |
7893 | change_address (result, mode, | |
7894 | plus_constant (XEXP (result, 0), | |
7895 | size))); | |
e7c33f54 | 7896 | |
ca695ac9 JB |
7897 | push_to_sequence (use_insns); |
7898 | emit_insn (gen_rtx (USE, VOIDmode, reg)); | |
7899 | use_insns = get_insns (); | |
7900 | end_sequence (); | |
7901 | size += GET_MODE_SIZE (mode); | |
7902 | } | |
e7c33f54 | 7903 | |
ca695ac9 JB |
7904 | /* Put the USE insns before the return. */ |
7905 | emit_insns (use_insns); | |
e7c33f54 | 7906 | |
ca695ac9 JB |
7907 | /* Return whatever values was restored by jumping directly to the end |
7908 | of the function. */ | |
7909 | expand_null_return (); | |
7910 | } | |
7911 | \f | |
7912 | /* Expand code for a post- or pre- increment or decrement | |
7913 | and return the RTX for the result. | |
7914 | POST is 1 for postinc/decrements and 0 for preinc/decrements. */ | |
e7c33f54 | 7915 | |
ca695ac9 JB |
7916 | static rtx |
7917 | expand_increment (exp, post) | |
7918 | register tree exp; | |
7919 | int post; | |
7920 | { | |
7921 | register rtx op0, op1; | |
7922 | register rtx temp, value; | |
7923 | register tree incremented = TREE_OPERAND (exp, 0); | |
7924 | optab this_optab = add_optab; | |
7925 | int icode; | |
7926 | enum machine_mode mode = TYPE_MODE (TREE_TYPE (exp)); | |
7927 | int op0_is_copy = 0; | |
7928 | int single_insn = 0; | |
a97f5a86 RS |
7929 | /* 1 means we can't store into OP0 directly, |
7930 | because it is a subreg narrower than a word, | |
7931 | and we don't dare clobber the rest of the word. */ | |
7932 | int bad_subreg = 0; | |
e7c33f54 | 7933 | |
ca695ac9 | 7934 | if (output_bytecode) |
c02bd5d9 JB |
7935 | { |
7936 | bc_expand_expr (exp); | |
7937 | return NULL_RTX; | |
7938 | } | |
e7c33f54 | 7939 | |
ca695ac9 JB |
7940 | /* Stabilize any component ref that might need to be |
7941 | evaluated more than once below. */ | |
7942 | if (!post | |
7943 | || TREE_CODE (incremented) == BIT_FIELD_REF | |
7944 | || (TREE_CODE (incremented) == COMPONENT_REF | |
7945 | && (TREE_CODE (TREE_OPERAND (incremented, 0)) != INDIRECT_REF | |
7946 | || DECL_BIT_FIELD (TREE_OPERAND (incremented, 1))))) | |
7947 | incremented = stabilize_reference (incremented); | |
7948 | /* Nested *INCREMENT_EXPRs can happen in C++. We must force innermost | |
7949 | ones into save exprs so that they don't accidentally get evaluated | |
7950 | more than once by the code below. */ | |
7951 | if (TREE_CODE (incremented) == PREINCREMENT_EXPR | |
7952 | || TREE_CODE (incremented) == PREDECREMENT_EXPR) | |
7953 | incremented = save_expr (incremented); | |
bbf6f052 | 7954 | |
ca695ac9 JB |
7955 | /* Compute the operands as RTX. |
7956 | Note whether OP0 is the actual lvalue or a copy of it: | |
7957 | I believe it is a copy iff it is a register or subreg | |
7958 | and insns were generated in computing it. */ | |
bbf6f052 | 7959 | |
ca695ac9 JB |
7960 | temp = get_last_insn (); |
7961 | op0 = expand_expr (incremented, NULL_RTX, VOIDmode, 0); | |
bbf6f052 | 7962 | |
ca695ac9 JB |
7963 | /* If OP0 is a SUBREG made for a promoted variable, we cannot increment |
7964 | in place but intead must do sign- or zero-extension during assignment, | |
7965 | so we copy it into a new register and let the code below use it as | |
7966 | a copy. | |
bbf6f052 | 7967 | |
ca695ac9 JB |
7968 | Note that we can safely modify this SUBREG since it is know not to be |
7969 | shared (it was made by the expand_expr call above). */ | |
bbf6f052 | 7970 | |
ca695ac9 JB |
7971 | if (GET_CODE (op0) == SUBREG && SUBREG_PROMOTED_VAR_P (op0)) |
7972 | SUBREG_REG (op0) = copy_to_reg (SUBREG_REG (op0)); | |
a97f5a86 RS |
7973 | else if (GET_CODE (op0) == SUBREG |
7974 | && GET_MODE_BITSIZE (GET_MODE (op0)) < BITS_PER_WORD) | |
79777b79 RK |
7975 | { |
7976 | /* We cannot increment this SUBREG in place. If we are | |
7977 | post-incrementing, get a copy of the old value. Otherwise, | |
7978 | just mark that we cannot increment in place. */ | |
7979 | if (post) | |
7980 | op0 = copy_to_reg (op0); | |
7981 | else | |
7982 | bad_subreg = 1; | |
7983 | } | |
bbf6f052 | 7984 | |
ca695ac9 JB |
7985 | op0_is_copy = ((GET_CODE (op0) == SUBREG || GET_CODE (op0) == REG) |
7986 | && temp != get_last_insn ()); | |
7987 | op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0); | |
bbf6f052 | 7988 | |
ca695ac9 JB |
7989 | /* Decide whether incrementing or decrementing. */ |
7990 | if (TREE_CODE (exp) == POSTDECREMENT_EXPR | |
7991 | || TREE_CODE (exp) == PREDECREMENT_EXPR) | |
7992 | this_optab = sub_optab; | |
bbf6f052 | 7993 | |
ca695ac9 JB |
7994 | /* Convert decrement by a constant into a negative increment. */ |
7995 | if (this_optab == sub_optab | |
7996 | && GET_CODE (op1) == CONST_INT) | |
7997 | { | |
7998 | op1 = GEN_INT (- INTVAL (op1)); | |
7999 | this_optab = add_optab; | |
8000 | } | |
bbf6f052 | 8001 | |
ca695ac9 JB |
8002 | /* For a preincrement, see if we can do this with a single instruction. */ |
8003 | if (!post) | |
8004 | { | |
8005 | icode = (int) this_optab->handlers[(int) mode].insn_code; | |
8006 | if (icode != (int) CODE_FOR_nothing | |
8007 | /* Make sure that OP0 is valid for operands 0 and 1 | |
8008 | of the insn we want to queue. */ | |
8009 | && (*insn_operand_predicate[icode][0]) (op0, mode) | |
8010 | && (*insn_operand_predicate[icode][1]) (op0, mode) | |
8011 | && (*insn_operand_predicate[icode][2]) (op1, mode)) | |
8012 | single_insn = 1; | |
8013 | } | |
bbf6f052 | 8014 | |
ca695ac9 JB |
8015 | /* If OP0 is not the actual lvalue, but rather a copy in a register, |
8016 | then we cannot just increment OP0. We must therefore contrive to | |
8017 | increment the original value. Then, for postincrement, we can return | |
8018 | OP0 since it is a copy of the old value. For preincrement, expand here | |
a97f5a86 RS |
8019 | unless we can do it with a single insn. |
8020 | ||
8021 | Likewise if storing directly into OP0 would clobber high bits | |
8022 | we need to preserve (bad_subreg). */ | |
8023 | if (op0_is_copy || (!post && !single_insn) || bad_subreg) | |
ca695ac9 JB |
8024 | { |
8025 | /* This is the easiest way to increment the value wherever it is. | |
8026 | Problems with multiple evaluation of INCREMENTED are prevented | |
8027 | because either (1) it is a component_ref or preincrement, | |
8028 | in which case it was stabilized above, or (2) it is an array_ref | |
8029 | with constant index in an array in a register, which is | |
8030 | safe to reevaluate. */ | |
8031 | tree newexp = build (((TREE_CODE (exp) == POSTDECREMENT_EXPR | |
8032 | || TREE_CODE (exp) == PREDECREMENT_EXPR) | |
8033 | ? MINUS_EXPR : PLUS_EXPR), | |
8034 | TREE_TYPE (exp), | |
8035 | incremented, | |
8036 | TREE_OPERAND (exp, 1)); | |
8037 | temp = expand_assignment (incremented, newexp, ! post, 0); | |
8038 | return post ? op0 : temp; | |
8039 | } | |
bbf6f052 | 8040 | |
ca695ac9 JB |
8041 | if (post) |
8042 | { | |
8043 | /* We have a true reference to the value in OP0. | |
8044 | If there is an insn to add or subtract in this mode, queue it. | |
8045 | Queueing the increment insn avoids the register shuffling | |
8046 | that often results if we must increment now and first save | |
8047 | the old value for subsequent use. */ | |
bbf6f052 | 8048 | |
ca695ac9 JB |
8049 | #if 0 /* Turned off to avoid making extra insn for indexed memref. */ |
8050 | op0 = stabilize (op0); | |
8051 | #endif | |
bbf6f052 | 8052 | |
ca695ac9 JB |
8053 | icode = (int) this_optab->handlers[(int) mode].insn_code; |
8054 | if (icode != (int) CODE_FOR_nothing | |
8055 | /* Make sure that OP0 is valid for operands 0 and 1 | |
8056 | of the insn we want to queue. */ | |
8057 | && (*insn_operand_predicate[icode][0]) (op0, mode) | |
8058 | && (*insn_operand_predicate[icode][1]) (op0, mode)) | |
8059 | { | |
8060 | if (! (*insn_operand_predicate[icode][2]) (op1, mode)) | |
8061 | op1 = force_reg (mode, op1); | |
bbf6f052 | 8062 | |
ca695ac9 JB |
8063 | return enqueue_insn (op0, GEN_FCN (icode) (op0, op0, op1)); |
8064 | } | |
8065 | } | |
bbf6f052 | 8066 | |
ca695ac9 JB |
8067 | /* Preincrement, or we can't increment with one simple insn. */ |
8068 | if (post) | |
8069 | /* Save a copy of the value before inc or dec, to return it later. */ | |
8070 | temp = value = copy_to_reg (op0); | |
8071 | else | |
8072 | /* Arrange to return the incremented value. */ | |
8073 | /* Copy the rtx because expand_binop will protect from the queue, | |
8074 | and the results of that would be invalid for us to return | |
8075 | if our caller does emit_queue before using our result. */ | |
8076 | temp = copy_rtx (value = op0); | |
bbf6f052 | 8077 | |
ca695ac9 JB |
8078 | /* Increment however we can. */ |
8079 | op1 = expand_binop (mode, this_optab, value, op1, op0, | |
8080 | TREE_UNSIGNED (TREE_TYPE (exp)), OPTAB_LIB_WIDEN); | |
8081 | /* Make sure the value is stored into OP0. */ | |
8082 | if (op1 != op0) | |
8083 | emit_move_insn (op0, op1); | |
bbf6f052 | 8084 | |
ca695ac9 JB |
8085 | return temp; |
8086 | } | |
8087 | \f | |
8088 | /* Expand all function calls contained within EXP, innermost ones first. | |
8089 | But don't look within expressions that have sequence points. | |
8090 | For each CALL_EXPR, record the rtx for its value | |
8091 | in the CALL_EXPR_RTL field. */ | |
bbf6f052 | 8092 | |
ca695ac9 JB |
8093 | static void |
8094 | preexpand_calls (exp) | |
8095 | tree exp; | |
8096 | { | |
8097 | register int nops, i; | |
8098 | int type = TREE_CODE_CLASS (TREE_CODE (exp)); | |
bbf6f052 | 8099 | |
ca695ac9 JB |
8100 | if (! do_preexpand_calls) |
8101 | return; | |
bbf6f052 | 8102 | |
ca695ac9 | 8103 | /* Only expressions and references can contain calls. */ |
bbf6f052 | 8104 | |
ca695ac9 JB |
8105 | if (type != 'e' && type != '<' && type != '1' && type != '2' && type != 'r') |
8106 | return; | |
bbf6f052 | 8107 | |
ca695ac9 JB |
8108 | switch (TREE_CODE (exp)) |
8109 | { | |
8110 | case CALL_EXPR: | |
8111 | /* Do nothing if already expanded. */ | |
8112 | if (CALL_EXPR_RTL (exp) != 0) | |
8113 | return; | |
bbf6f052 | 8114 | |
ca695ac9 JB |
8115 | /* Do nothing to built-in functions. */ |
8116 | if (TREE_CODE (TREE_OPERAND (exp, 0)) != ADDR_EXPR | |
8117 | || TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) != FUNCTION_DECL | |
8118 | || ! DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))) | |
8119 | CALL_EXPR_RTL (exp) = expand_call (exp, NULL_RTX, 0); | |
8120 | return; | |
bbf6f052 | 8121 | |
ca695ac9 JB |
8122 | case COMPOUND_EXPR: |
8123 | case COND_EXPR: | |
8124 | case TRUTH_ANDIF_EXPR: | |
8125 | case TRUTH_ORIF_EXPR: | |
8126 | /* If we find one of these, then we can be sure | |
8127 | the adjust will be done for it (since it makes jumps). | |
8128 | Do it now, so that if this is inside an argument | |
8129 | of a function, we don't get the stack adjustment | |
8130 | after some other args have already been pushed. */ | |
8131 | do_pending_stack_adjust (); | |
8132 | return; | |
bbf6f052 | 8133 | |
ca695ac9 JB |
8134 | case BLOCK: |
8135 | case RTL_EXPR: | |
8136 | case WITH_CLEANUP_EXPR: | |
8137 | return; | |
bbf6f052 | 8138 | |
ca695ac9 JB |
8139 | case SAVE_EXPR: |
8140 | if (SAVE_EXPR_RTL (exp) != 0) | |
8141 | return; | |
8142 | } | |
bbf6f052 | 8143 | |
ca695ac9 JB |
8144 | nops = tree_code_length[(int) TREE_CODE (exp)]; |
8145 | for (i = 0; i < nops; i++) | |
8146 | if (TREE_OPERAND (exp, i) != 0) | |
8147 | { | |
8148 | type = TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, i))); | |
8149 | if (type == 'e' || type == '<' || type == '1' || type == '2' | |
8150 | || type == 'r') | |
8151 | preexpand_calls (TREE_OPERAND (exp, i)); | |
8152 | } | |
bbf6f052 RK |
8153 | } |
8154 | \f | |
ca695ac9 JB |
8155 | /* At the start of a function, record that we have no previously-pushed |
8156 | arguments waiting to be popped. */ | |
0006469d | 8157 | |
ca695ac9 JB |
8158 | void |
8159 | init_pending_stack_adjust () | |
8160 | { | |
8161 | pending_stack_adjust = 0; | |
8162 | } | |
fb2ca25a | 8163 | |
ca695ac9 JB |
8164 | /* When exiting from function, if safe, clear out any pending stack adjust |
8165 | so the adjustment won't get done. */ | |
904762c8 | 8166 | |
ca695ac9 JB |
8167 | void |
8168 | clear_pending_stack_adjust () | |
fb2ca25a | 8169 | { |
ca695ac9 JB |
8170 | #ifdef EXIT_IGNORE_STACK |
8171 | if (! flag_omit_frame_pointer && EXIT_IGNORE_STACK | |
8172 | && ! (DECL_INLINE (current_function_decl) && ! flag_no_inline) | |
8173 | && ! flag_inline_functions) | |
8174 | pending_stack_adjust = 0; | |
fb2ca25a | 8175 | #endif |
fb2ca25a KKT |
8176 | } |
8177 | ||
ca695ac9 JB |
8178 | /* Pop any previously-pushed arguments that have not been popped yet. */ |
8179 | ||
8180 | void | |
8181 | do_pending_stack_adjust () | |
8182 | { | |
8183 | if (inhibit_defer_pop == 0) | |
8184 | { | |
8185 | if (pending_stack_adjust != 0) | |
8186 | adjust_stack (GEN_INT (pending_stack_adjust)); | |
8187 | pending_stack_adjust = 0; | |
8188 | } | |
8189 | } | |
8190 | ||
8191 | /* Expand all cleanups up to OLD_CLEANUPS. | |
8192 | Needed here, and also for language-dependent calls. */ | |
904762c8 | 8193 | |
ca695ac9 JB |
8194 | void |
8195 | expand_cleanups_to (old_cleanups) | |
8196 | tree old_cleanups; | |
0006469d | 8197 | { |
ca695ac9 | 8198 | while (cleanups_this_call != old_cleanups) |
0006469d | 8199 | { |
ca695ac9 JB |
8200 | expand_expr (TREE_VALUE (cleanups_this_call), NULL_RTX, VOIDmode, 0); |
8201 | cleanups_this_call = TREE_CHAIN (cleanups_this_call); | |
8202 | } | |
8203 | } | |
8204 | \f | |
8205 | /* Expand conditional expressions. */ | |
0006469d | 8206 | |
ca695ac9 JB |
8207 | /* Generate code to evaluate EXP and jump to LABEL if the value is zero. |
8208 | LABEL is an rtx of code CODE_LABEL, in this function and all the | |
8209 | functions here. */ | |
0006469d | 8210 | |
ca695ac9 JB |
8211 | void |
8212 | jumpifnot (exp, label) | |
8213 | tree exp; | |
8214 | rtx label; | |
8215 | { | |
8216 | do_jump (exp, label, NULL_RTX); | |
8217 | } | |
0006469d | 8218 | |
ca695ac9 | 8219 | /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */ |
0006469d | 8220 | |
ca695ac9 JB |
8221 | void |
8222 | jumpif (exp, label) | |
8223 | tree exp; | |
8224 | rtx label; | |
8225 | { | |
8226 | do_jump (exp, NULL_RTX, label); | |
8227 | } | |
0006469d | 8228 | |
ca695ac9 JB |
8229 | /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if |
8230 | the result is zero, or IF_TRUE_LABEL if the result is one. | |
8231 | Either of IF_FALSE_LABEL and IF_TRUE_LABEL may be zero, | |
8232 | meaning fall through in that case. | |
0006469d | 8233 | |
ca695ac9 JB |
8234 | do_jump always does any pending stack adjust except when it does not |
8235 | actually perform a jump. An example where there is no jump | |
8236 | is when EXP is `(foo (), 0)' and IF_FALSE_LABEL is null. | |
0006469d | 8237 | |
ca695ac9 JB |
8238 | This function is responsible for optimizing cases such as |
8239 | &&, || and comparison operators in EXP. */ | |
904762c8 | 8240 | |
ca695ac9 JB |
8241 | void |
8242 | do_jump (exp, if_false_label, if_true_label) | |
8243 | tree exp; | |
8244 | rtx if_false_label, if_true_label; | |
0006469d | 8245 | { |
ca695ac9 JB |
8246 | register enum tree_code code = TREE_CODE (exp); |
8247 | /* Some cases need to create a label to jump to | |
8248 | in order to properly fall through. | |
8249 | These cases set DROP_THROUGH_LABEL nonzero. */ | |
8250 | rtx drop_through_label = 0; | |
8251 | rtx temp; | |
8252 | rtx comparison = 0; | |
8253 | int i; | |
8254 | tree type; | |
0006469d | 8255 | |
ca695ac9 | 8256 | emit_queue (); |
0006469d | 8257 | |
ca695ac9 JB |
8258 | switch (code) |
8259 | { | |
8260 | case ERROR_MARK: | |
8261 | break; | |
0006469d | 8262 | |
ca695ac9 JB |
8263 | case INTEGER_CST: |
8264 | temp = integer_zerop (exp) ? if_false_label : if_true_label; | |
8265 | if (temp) | |
8266 | emit_jump (temp); | |
8267 | break; | |
0006469d | 8268 | |
ca695ac9 JB |
8269 | #if 0 |
8270 | /* This is not true with #pragma weak */ | |
8271 | case ADDR_EXPR: | |
8272 | /* The address of something can never be zero. */ | |
8273 | if (if_true_label) | |
8274 | emit_jump (if_true_label); | |
8275 | break; | |
8276 | #endif | |
0006469d | 8277 | |
ca695ac9 JB |
8278 | case NOP_EXPR: |
8279 | if (TREE_CODE (TREE_OPERAND (exp, 0)) == COMPONENT_REF | |
8280 | || TREE_CODE (TREE_OPERAND (exp, 0)) == BIT_FIELD_REF | |
8281 | || TREE_CODE (TREE_OPERAND (exp, 0)) == ARRAY_REF) | |
8282 | goto normal; | |
8283 | case CONVERT_EXPR: | |
8284 | /* If we are narrowing the operand, we have to do the compare in the | |
8285 | narrower mode. */ | |
8286 | if ((TYPE_PRECISION (TREE_TYPE (exp)) | |
8287 | < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp, 0))))) | |
8288 | goto normal; | |
8289 | case NON_LVALUE_EXPR: | |
8290 | case REFERENCE_EXPR: | |
8291 | case ABS_EXPR: | |
8292 | case NEGATE_EXPR: | |
8293 | case LROTATE_EXPR: | |
8294 | case RROTATE_EXPR: | |
8295 | /* These cannot change zero->non-zero or vice versa. */ | |
8296 | do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label); | |
8297 | break; | |
0006469d | 8298 | |
ca695ac9 JB |
8299 | #if 0 |
8300 | /* This is never less insns than evaluating the PLUS_EXPR followed by | |
8301 | a test and can be longer if the test is eliminated. */ | |
8302 | case PLUS_EXPR: | |
8303 | /* Reduce to minus. */ | |
8304 | exp = build (MINUS_EXPR, TREE_TYPE (exp), | |
8305 | TREE_OPERAND (exp, 0), | |
8306 | fold (build1 (NEGATE_EXPR, TREE_TYPE (TREE_OPERAND (exp, 1)), | |
8307 | TREE_OPERAND (exp, 1)))); | |
8308 | /* Process as MINUS. */ | |
0006469d | 8309 | #endif |
0006469d | 8310 | |
ca695ac9 JB |
8311 | case MINUS_EXPR: |
8312 | /* Non-zero iff operands of minus differ. */ | |
8313 | comparison = compare (build (NE_EXPR, TREE_TYPE (exp), | |
8314 | TREE_OPERAND (exp, 0), | |
8315 | TREE_OPERAND (exp, 1)), | |
8316 | NE, NE); | |
8317 | break; | |
904762c8 | 8318 | |
ca695ac9 JB |
8319 | case BIT_AND_EXPR: |
8320 | /* If we are AND'ing with a small constant, do this comparison in the | |
8321 | smallest type that fits. If the machine doesn't have comparisons | |
8322 | that small, it will be converted back to the wider comparison. | |
8323 | This helps if we are testing the sign bit of a narrower object. | |
8324 | combine can't do this for us because it can't know whether a | |
8325 | ZERO_EXTRACT or a compare in a smaller mode exists, but we do. */ | |
0006469d | 8326 | |
ca695ac9 JB |
8327 | if (! SLOW_BYTE_ACCESS |
8328 | && TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST | |
8329 | && TYPE_PRECISION (TREE_TYPE (exp)) <= HOST_BITS_PER_WIDE_INT | |
8330 | && (i = floor_log2 (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)))) >= 0 | |
8331 | && (type = type_for_size (i + 1, 1)) != 0 | |
8332 | && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (exp)) | |
8333 | && (cmp_optab->handlers[(int) TYPE_MODE (type)].insn_code | |
8334 | != CODE_FOR_nothing)) | |
8335 | { | |
8336 | do_jump (convert (type, exp), if_false_label, if_true_label); | |
8337 | break; | |
8338 | } | |
8339 | goto normal; | |
904762c8 | 8340 | |
ca695ac9 JB |
8341 | case TRUTH_NOT_EXPR: |
8342 | do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label); | |
8343 | break; | |
0006469d | 8344 | |
ca695ac9 JB |
8345 | case TRUTH_ANDIF_EXPR: |
8346 | if (if_false_label == 0) | |
8347 | if_false_label = drop_through_label = gen_label_rtx (); | |
8348 | do_jump (TREE_OPERAND (exp, 0), if_false_label, NULL_RTX); | |
8349 | do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label); | |
8350 | break; | |
0006469d | 8351 | |
ca695ac9 JB |
8352 | case TRUTH_ORIF_EXPR: |
8353 | if (if_true_label == 0) | |
8354 | if_true_label = drop_through_label = gen_label_rtx (); | |
8355 | do_jump (TREE_OPERAND (exp, 0), NULL_RTX, if_true_label); | |
8356 | do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label); | |
8357 | break; | |
0006469d | 8358 | |
ca695ac9 | 8359 | case COMPOUND_EXPR: |
0088fcb1 | 8360 | push_temp_slots (); |
ca695ac9 JB |
8361 | expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0); |
8362 | free_temp_slots (); | |
0088fcb1 | 8363 | pop_temp_slots (); |
ca695ac9 JB |
8364 | emit_queue (); |
8365 | do_pending_stack_adjust (); | |
8366 | do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label); | |
8367 | break; | |
0006469d | 8368 | |
ca695ac9 JB |
8369 | case COMPONENT_REF: |
8370 | case BIT_FIELD_REF: | |
8371 | case ARRAY_REF: | |
8372 | { | |
8373 | int bitsize, bitpos, unsignedp; | |
8374 | enum machine_mode mode; | |
8375 | tree type; | |
8376 | tree offset; | |
8377 | int volatilep = 0; | |
0006469d | 8378 | |
ca695ac9 JB |
8379 | /* Get description of this reference. We don't actually care |
8380 | about the underlying object here. */ | |
8381 | get_inner_reference (exp, &bitsize, &bitpos, &offset, | |
8382 | &mode, &unsignedp, &volatilep); | |
0006469d | 8383 | |
ca695ac9 JB |
8384 | type = type_for_size (bitsize, unsignedp); |
8385 | if (! SLOW_BYTE_ACCESS | |
8386 | && type != 0 && bitsize >= 0 | |
8387 | && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (exp)) | |
8388 | && (cmp_optab->handlers[(int) TYPE_MODE (type)].insn_code | |
8389 | != CODE_FOR_nothing)) | |
8390 | { | |
8391 | do_jump (convert (type, exp), if_false_label, if_true_label); | |
8392 | break; | |
8393 | } | |
8394 | goto normal; | |
8395 | } | |
0006469d | 8396 | |
ca695ac9 JB |
8397 | case COND_EXPR: |
8398 | /* Do (a ? 1 : 0) and (a ? 0 : 1) as special cases. */ | |
8399 | if (integer_onep (TREE_OPERAND (exp, 1)) | |
8400 | && integer_zerop (TREE_OPERAND (exp, 2))) | |
8401 | do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label); | |
904762c8 | 8402 | |
ca695ac9 JB |
8403 | else if (integer_zerop (TREE_OPERAND (exp, 1)) |
8404 | && integer_onep (TREE_OPERAND (exp, 2))) | |
8405 | do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label); | |
0006469d | 8406 | |
ca695ac9 JB |
8407 | else |
8408 | { | |
8409 | register rtx label1 = gen_label_rtx (); | |
8410 | drop_through_label = gen_label_rtx (); | |
8411 | do_jump (TREE_OPERAND (exp, 0), label1, NULL_RTX); | |
8412 | /* Now the THEN-expression. */ | |
8413 | do_jump (TREE_OPERAND (exp, 1), | |
8414 | if_false_label ? if_false_label : drop_through_label, | |
8415 | if_true_label ? if_true_label : drop_through_label); | |
8416 | /* In case the do_jump just above never jumps. */ | |
8417 | do_pending_stack_adjust (); | |
8418 | emit_label (label1); | |
8419 | /* Now the ELSE-expression. */ | |
8420 | do_jump (TREE_OPERAND (exp, 2), | |
8421 | if_false_label ? if_false_label : drop_through_label, | |
8422 | if_true_label ? if_true_label : drop_through_label); | |
8423 | } | |
8424 | break; | |
0006469d | 8425 | |
ca695ac9 JB |
8426 | case EQ_EXPR: |
8427 | if (integer_zerop (TREE_OPERAND (exp, 1))) | |
8428 | do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label); | |
0766f239 RS |
8429 | else if (((GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))) |
8430 | == MODE_INT) | |
8431 | && | |
8432 | !can_compare_p (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))) | |
8433 | || GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))) == MODE_COMPLEX_FLOAT | |
8434 | || GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))) == MODE_COMPLEX_INT) | |
ca695ac9 JB |
8435 | do_jump_by_parts_equality (exp, if_false_label, if_true_label); |
8436 | else | |
8437 | comparison = compare (exp, EQ, EQ); | |
8438 | break; | |
0006469d | 8439 | |
ca695ac9 JB |
8440 | case NE_EXPR: |
8441 | if (integer_zerop (TREE_OPERAND (exp, 1))) | |
8442 | do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label); | |
0766f239 RS |
8443 | else if (((GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))) |
8444 | == MODE_INT) | |
8445 | && | |
8446 | !can_compare_p (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))) | |
8447 | || GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))) == MODE_COMPLEX_FLOAT | |
8448 | || GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))) == MODE_COMPLEX_INT) | |
ca695ac9 JB |
8449 | do_jump_by_parts_equality (exp, if_true_label, if_false_label); |
8450 | else | |
8451 | comparison = compare (exp, NE, NE); | |
8452 | break; | |
0006469d | 8453 | |
ca695ac9 JB |
8454 | case LT_EXPR: |
8455 | if ((GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))) | |
8456 | == MODE_INT) | |
8457 | && !can_compare_p (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))) | |
8458 | do_jump_by_parts_greater (exp, 1, if_false_label, if_true_label); | |
8459 | else | |
8460 | comparison = compare (exp, LT, LTU); | |
8461 | break; | |
0006469d | 8462 | |
ca695ac9 JB |
8463 | case LE_EXPR: |
8464 | if ((GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))) | |
8465 | == MODE_INT) | |
8466 | && !can_compare_p (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))) | |
8467 | do_jump_by_parts_greater (exp, 0, if_true_label, if_false_label); | |
8468 | else | |
8469 | comparison = compare (exp, LE, LEU); | |
8470 | break; | |
0006469d | 8471 | |
ca695ac9 JB |
8472 | case GT_EXPR: |
8473 | if ((GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))) | |
8474 | == MODE_INT) | |
8475 | && !can_compare_p (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))) | |
8476 | do_jump_by_parts_greater (exp, 0, if_false_label, if_true_label); | |
8477 | else | |
8478 | comparison = compare (exp, GT, GTU); | |
8479 | break; | |
0006469d | 8480 | |
ca695ac9 JB |
8481 | case GE_EXPR: |
8482 | if ((GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))) | |
8483 | == MODE_INT) | |
8484 | && !can_compare_p (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))) | |
8485 | do_jump_by_parts_greater (exp, 1, if_true_label, if_false_label); | |
8486 | else | |
8487 | comparison = compare (exp, GE, GEU); | |
8488 | break; | |
0006469d | 8489 | |
ca695ac9 JB |
8490 | default: |
8491 | normal: | |
8492 | temp = expand_expr (exp, NULL_RTX, VOIDmode, 0); | |
8493 | #if 0 | |
8494 | /* This is not needed any more and causes poor code since it causes | |
8495 | comparisons and tests from non-SI objects to have different code | |
8496 | sequences. */ | |
8497 | /* Copy to register to avoid generating bad insns by cse | |
8498 | from (set (mem ...) (arithop)) (set (cc0) (mem ...)). */ | |
8499 | if (!cse_not_expected && GET_CODE (temp) == MEM) | |
8500 | temp = copy_to_reg (temp); | |
8501 | #endif | |
8502 | do_pending_stack_adjust (); | |
8503 | if (GET_CODE (temp) == CONST_INT) | |
8504 | comparison = (temp == const0_rtx ? const0_rtx : const_true_rtx); | |
8505 | else if (GET_CODE (temp) == LABEL_REF) | |
8506 | comparison = const_true_rtx; | |
8507 | else if (GET_MODE_CLASS (GET_MODE (temp)) == MODE_INT | |
8508 | && !can_compare_p (GET_MODE (temp))) | |
8509 | /* Note swapping the labels gives us not-equal. */ | |
8510 | do_jump_by_parts_equality_rtx (temp, if_true_label, if_false_label); | |
8511 | else if (GET_MODE (temp) != VOIDmode) | |
8512 | comparison = compare_from_rtx (temp, CONST0_RTX (GET_MODE (temp)), | |
8513 | NE, TREE_UNSIGNED (TREE_TYPE (exp)), | |
8514 | GET_MODE (temp), NULL_RTX, 0); | |
8515 | else | |
8516 | abort (); | |
8517 | } | |
0006469d | 8518 | |
ca695ac9 JB |
8519 | /* Do any postincrements in the expression that was tested. */ |
8520 | emit_queue (); | |
0006469d | 8521 | |
ca695ac9 JB |
8522 | /* If COMPARISON is nonzero here, it is an rtx that can be substituted |
8523 | straight into a conditional jump instruction as the jump condition. | |
8524 | Otherwise, all the work has been done already. */ | |
0006469d | 8525 | |
ca695ac9 | 8526 | if (comparison == const_true_rtx) |
0006469d | 8527 | { |
ca695ac9 JB |
8528 | if (if_true_label) |
8529 | emit_jump (if_true_label); | |
0006469d | 8530 | } |
ca695ac9 JB |
8531 | else if (comparison == const0_rtx) |
8532 | { | |
8533 | if (if_false_label) | |
8534 | emit_jump (if_false_label); | |
8535 | } | |
8536 | else if (comparison) | |
8537 | do_jump_for_compare (comparison, if_false_label, if_true_label); | |
0006469d | 8538 | |
ca695ac9 | 8539 | if (drop_through_label) |
0006469d | 8540 | { |
ca695ac9 JB |
8541 | /* If do_jump produces code that might be jumped around, |
8542 | do any stack adjusts from that code, before the place | |
8543 | where control merges in. */ | |
8544 | do_pending_stack_adjust (); | |
8545 | emit_label (drop_through_label); | |
8546 | } | |
8547 | } | |
8548 | \f | |
8549 | /* Given a comparison expression EXP for values too wide to be compared | |
8550 | with one insn, test the comparison and jump to the appropriate label. | |
8551 | The code of EXP is ignored; we always test GT if SWAP is 0, | |
8552 | and LT if SWAP is 1. */ | |
0006469d | 8553 | |
ca695ac9 JB |
8554 | static void |
8555 | do_jump_by_parts_greater (exp, swap, if_false_label, if_true_label) | |
8556 | tree exp; | |
8557 | int swap; | |
8558 | rtx if_false_label, if_true_label; | |
8559 | { | |
8560 | rtx op0 = expand_expr (TREE_OPERAND (exp, swap), NULL_RTX, VOIDmode, 0); | |
8561 | rtx op1 = expand_expr (TREE_OPERAND (exp, !swap), NULL_RTX, VOIDmode, 0); | |
8562 | enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))); | |
8563 | int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD); | |
8564 | rtx drop_through_label = 0; | |
8565 | int unsignedp = TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))); | |
8566 | int i; | |
0006469d | 8567 | |
ca695ac9 JB |
8568 | if (! if_true_label || ! if_false_label) |
8569 | drop_through_label = gen_label_rtx (); | |
8570 | if (! if_true_label) | |
8571 | if_true_label = drop_through_label; | |
8572 | if (! if_false_label) | |
8573 | if_false_label = drop_through_label; | |
0006469d | 8574 | |
ca695ac9 JB |
8575 | /* Compare a word at a time, high order first. */ |
8576 | for (i = 0; i < nwords; i++) | |
8577 | { | |
8578 | rtx comp; | |
8579 | rtx op0_word, op1_word; | |
0006469d | 8580 | |
ca695ac9 JB |
8581 | if (WORDS_BIG_ENDIAN) |
8582 | { | |
8583 | op0_word = operand_subword_force (op0, i, mode); | |
8584 | op1_word = operand_subword_force (op1, i, mode); | |
8585 | } | |
8586 | else | |
8587 | { | |
8588 | op0_word = operand_subword_force (op0, nwords - 1 - i, mode); | |
8589 | op1_word = operand_subword_force (op1, nwords - 1 - i, mode); | |
8590 | } | |
0006469d | 8591 | |
ca695ac9 JB |
8592 | /* All but high-order word must be compared as unsigned. */ |
8593 | comp = compare_from_rtx (op0_word, op1_word, | |
8594 | (unsignedp || i > 0) ? GTU : GT, | |
8595 | unsignedp, word_mode, NULL_RTX, 0); | |
8596 | if (comp == const_true_rtx) | |
8597 | emit_jump (if_true_label); | |
8598 | else if (comp != const0_rtx) | |
8599 | do_jump_for_compare (comp, NULL_RTX, if_true_label); | |
0006469d | 8600 | |
ca695ac9 JB |
8601 | /* Consider lower words only if these are equal. */ |
8602 | comp = compare_from_rtx (op0_word, op1_word, NE, unsignedp, word_mode, | |
8603 | NULL_RTX, 0); | |
8604 | if (comp == const_true_rtx) | |
8605 | emit_jump (if_false_label); | |
8606 | else if (comp != const0_rtx) | |
8607 | do_jump_for_compare (comp, NULL_RTX, if_false_label); | |
8608 | } | |
0006469d | 8609 | |
ca695ac9 JB |
8610 | if (if_false_label) |
8611 | emit_jump (if_false_label); | |
8612 | if (drop_through_label) | |
8613 | emit_label (drop_through_label); | |
0006469d TW |
8614 | } |
8615 | ||
ca695ac9 JB |
8616 | /* Compare OP0 with OP1, word at a time, in mode MODE. |
8617 | UNSIGNEDP says to do unsigned comparison. | |
8618 | Jump to IF_TRUE_LABEL if OP0 is greater, IF_FALSE_LABEL otherwise. */ | |
904762c8 | 8619 | |
0006469d | 8620 | static void |
ca695ac9 JB |
8621 | do_jump_by_parts_greater_rtx (mode, unsignedp, op0, op1, if_false_label, if_true_label) |
8622 | enum machine_mode mode; | |
8623 | int unsignedp; | |
8624 | rtx op0, op1; | |
8625 | rtx if_false_label, if_true_label; | |
0006469d | 8626 | { |
ca695ac9 JB |
8627 | int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD); |
8628 | rtx drop_through_label = 0; | |
8629 | int i; | |
0006469d | 8630 | |
ca695ac9 JB |
8631 | if (! if_true_label || ! if_false_label) |
8632 | drop_through_label = gen_label_rtx (); | |
8633 | if (! if_true_label) | |
8634 | if_true_label = drop_through_label; | |
8635 | if (! if_false_label) | |
8636 | if_false_label = drop_through_label; | |
0006469d | 8637 | |
ca695ac9 JB |
8638 | /* Compare a word at a time, high order first. */ |
8639 | for (i = 0; i < nwords; i++) | |
0006469d | 8640 | { |
ca695ac9 JB |
8641 | rtx comp; |
8642 | rtx op0_word, op1_word; | |
0006469d | 8643 | |
ca695ac9 JB |
8644 | if (WORDS_BIG_ENDIAN) |
8645 | { | |
8646 | op0_word = operand_subword_force (op0, i, mode); | |
8647 | op1_word = operand_subword_force (op1, i, mode); | |
8648 | } | |
8649 | else | |
8650 | { | |
8651 | op0_word = operand_subword_force (op0, nwords - 1 - i, mode); | |
8652 | op1_word = operand_subword_force (op1, nwords - 1 - i, mode); | |
8653 | } | |
0006469d | 8654 | |
ca695ac9 JB |
8655 | /* All but high-order word must be compared as unsigned. */ |
8656 | comp = compare_from_rtx (op0_word, op1_word, | |
8657 | (unsignedp || i > 0) ? GTU : GT, | |
8658 | unsignedp, word_mode, NULL_RTX, 0); | |
8659 | if (comp == const_true_rtx) | |
8660 | emit_jump (if_true_label); | |
8661 | else if (comp != const0_rtx) | |
8662 | do_jump_for_compare (comp, NULL_RTX, if_true_label); | |
0006469d | 8663 | |
ca695ac9 JB |
8664 | /* Consider lower words only if these are equal. */ |
8665 | comp = compare_from_rtx (op0_word, op1_word, NE, unsignedp, word_mode, | |
8666 | NULL_RTX, 0); | |
8667 | if (comp == const_true_rtx) | |
8668 | emit_jump (if_false_label); | |
8669 | else if (comp != const0_rtx) | |
8670 | do_jump_for_compare (comp, NULL_RTX, if_false_label); | |
8671 | } | |
0006469d | 8672 | |
ca695ac9 JB |
8673 | if (if_false_label) |
8674 | emit_jump (if_false_label); | |
8675 | if (drop_through_label) | |
8676 | emit_label (drop_through_label); | |
0006469d | 8677 | } |
bbf6f052 | 8678 | |
ca695ac9 JB |
8679 | /* Given an EQ_EXPR expression EXP for values too wide to be compared |
8680 | with one insn, test the comparison and jump to the appropriate label. */ | |
8681 | ||
8682 | static void | |
8683 | do_jump_by_parts_equality (exp, if_false_label, if_true_label) | |
8684 | tree exp; | |
8685 | rtx if_false_label, if_true_label; | |
bbf6f052 | 8686 | { |
ca695ac9 JB |
8687 | rtx op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0); |
8688 | rtx op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0); | |
8689 | enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))); | |
8690 | int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD); | |
8691 | int i; | |
8692 | rtx drop_through_label = 0; | |
bbf6f052 | 8693 | |
ca695ac9 JB |
8694 | if (! if_false_label) |
8695 | drop_through_label = if_false_label = gen_label_rtx (); | |
bbf6f052 | 8696 | |
ca695ac9 JB |
8697 | for (i = 0; i < nwords; i++) |
8698 | { | |
8699 | rtx comp = compare_from_rtx (operand_subword_force (op0, i, mode), | |
8700 | operand_subword_force (op1, i, mode), | |
8701 | EQ, TREE_UNSIGNED (TREE_TYPE (exp)), | |
8702 | word_mode, NULL_RTX, 0); | |
8703 | if (comp == const_true_rtx) | |
8704 | emit_jump (if_false_label); | |
8705 | else if (comp != const0_rtx) | |
8706 | do_jump_for_compare (comp, if_false_label, NULL_RTX); | |
8707 | } | |
1499e0a8 | 8708 | |
ca695ac9 JB |
8709 | if (if_true_label) |
8710 | emit_jump (if_true_label); | |
8711 | if (drop_through_label) | |
8712 | emit_label (drop_through_label); | |
8713 | } | |
8714 | \f | |
8715 | /* Jump according to whether OP0 is 0. | |
8716 | We assume that OP0 has an integer mode that is too wide | |
8717 | for the available compare insns. */ | |
1499e0a8 | 8718 | |
ca695ac9 JB |
8719 | static void |
8720 | do_jump_by_parts_equality_rtx (op0, if_false_label, if_true_label) | |
8721 | rtx op0; | |
8722 | rtx if_false_label, if_true_label; | |
8723 | { | |
8724 | int nwords = GET_MODE_SIZE (GET_MODE (op0)) / UNITS_PER_WORD; | |
8725 | int i; | |
8726 | rtx drop_through_label = 0; | |
1499e0a8 | 8727 | |
ca695ac9 JB |
8728 | if (! if_false_label) |
8729 | drop_through_label = if_false_label = gen_label_rtx (); | |
1499e0a8 | 8730 | |
ca695ac9 JB |
8731 | for (i = 0; i < nwords; i++) |
8732 | { | |
8733 | rtx comp = compare_from_rtx (operand_subword_force (op0, i, | |
8734 | GET_MODE (op0)), | |
8735 | const0_rtx, EQ, 1, word_mode, NULL_RTX, 0); | |
8736 | if (comp == const_true_rtx) | |
8737 | emit_jump (if_false_label); | |
8738 | else if (comp != const0_rtx) | |
8739 | do_jump_for_compare (comp, if_false_label, NULL_RTX); | |
8740 | } | |
1499e0a8 | 8741 | |
ca695ac9 JB |
8742 | if (if_true_label) |
8743 | emit_jump (if_true_label); | |
8744 | if (drop_through_label) | |
8745 | emit_label (drop_through_label); | |
8746 | } | |
bbf6f052 | 8747 | |
ca695ac9 JB |
8748 | /* Given a comparison expression in rtl form, output conditional branches to |
8749 | IF_TRUE_LABEL, IF_FALSE_LABEL, or both. */ | |
bbf6f052 | 8750 | |
ca695ac9 JB |
8751 | static void |
8752 | do_jump_for_compare (comparison, if_false_label, if_true_label) | |
8753 | rtx comparison, if_false_label, if_true_label; | |
8754 | { | |
8755 | if (if_true_label) | |
a358cee0 | 8756 | { |
ca695ac9 JB |
8757 | if (bcc_gen_fctn[(int) GET_CODE (comparison)] != 0) |
8758 | emit_jump_insn ((*bcc_gen_fctn[(int) GET_CODE (comparison)]) (if_true_label)); | |
8759 | else | |
8760 | abort (); | |
a358cee0 | 8761 | |
ca695ac9 JB |
8762 | if (if_false_label) |
8763 | emit_jump (if_false_label); | |
c980ac49 | 8764 | } |
ca695ac9 | 8765 | else if (if_false_label) |
bbf6f052 | 8766 | { |
ca695ac9 | 8767 | rtx insn; |
f12f485a | 8768 | rtx prev = get_last_insn (); |
ca695ac9 | 8769 | rtx branch = 0; |
bbf6f052 | 8770 | |
f12f485a RK |
8771 | if (prev != 0) |
8772 | prev = PREV_INSN (prev); | |
8773 | ||
ca695ac9 JB |
8774 | /* Output the branch with the opposite condition. Then try to invert |
8775 | what is generated. If more than one insn is a branch, or if the | |
8776 | branch is not the last insn written, abort. If we can't invert | |
8777 | the branch, emit make a true label, redirect this jump to that, | |
8778 | emit a jump to the false label and define the true label. */ | |
bbf6f052 | 8779 | |
ca695ac9 JB |
8780 | if (bcc_gen_fctn[(int) GET_CODE (comparison)] != 0) |
8781 | emit_jump_insn ((*bcc_gen_fctn[(int) GET_CODE (comparison)]) (if_false_label)); | |
8782 | else | |
8783 | abort (); | |
bbf6f052 | 8784 | |
ca695ac9 JB |
8785 | /* Here we get the insn before what was just emitted. |
8786 | On some machines, emitting the branch can discard | |
8787 | the previous compare insn and emit a replacement. */ | |
8788 | if (prev == 0) | |
8789 | /* If there's only one preceding insn... */ | |
8790 | insn = get_insns (); | |
8791 | else | |
8792 | insn = NEXT_INSN (prev); | |
bbf6f052 | 8793 | |
ca695ac9 JB |
8794 | for (insn = NEXT_INSN (insn); insn; insn = NEXT_INSN (insn)) |
8795 | if (GET_CODE (insn) == JUMP_INSN) | |
8796 | { | |
8797 | if (branch) | |
8798 | abort (); | |
8799 | branch = insn; | |
8800 | } | |
8801 | ||
8802 | if (branch != get_last_insn ()) | |
8803 | abort (); | |
8804 | ||
127e4d19 | 8805 | JUMP_LABEL (branch) = if_false_label; |
ca695ac9 JB |
8806 | if (! invert_jump (branch, if_false_label)) |
8807 | { | |
8808 | if_true_label = gen_label_rtx (); | |
8809 | redirect_jump (branch, if_true_label); | |
8810 | emit_jump (if_false_label); | |
8811 | emit_label (if_true_label); | |
bbf6f052 RK |
8812 | } |
8813 | } | |
ca695ac9 JB |
8814 | } |
8815 | \f | |
8816 | /* Generate code for a comparison expression EXP | |
8817 | (including code to compute the values to be compared) | |
8818 | and set (CC0) according to the result. | |
8819 | SIGNED_CODE should be the rtx operation for this comparison for | |
8820 | signed data; UNSIGNED_CODE, likewise for use if data is unsigned. | |
8821 | ||
8822 | We force a stack adjustment unless there are currently | |
8823 | things pushed on the stack that aren't yet used. */ | |
8824 | ||
8825 | static rtx | |
8826 | compare (exp, signed_code, unsigned_code) | |
8827 | register tree exp; | |
8828 | enum rtx_code signed_code, unsigned_code; | |
8829 | { | |
8830 | register rtx op0 | |
8831 | = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0); | |
8832 | register rtx op1 | |
8833 | = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0); | |
8834 | register tree type = TREE_TYPE (TREE_OPERAND (exp, 0)); | |
8835 | register enum machine_mode mode = TYPE_MODE (type); | |
8836 | int unsignedp = TREE_UNSIGNED (type); | |
8837 | enum rtx_code code = unsignedp ? unsigned_code : signed_code; | |
bbf6f052 | 8838 | |
ca695ac9 JB |
8839 | return compare_from_rtx (op0, op1, code, unsignedp, mode, |
8840 | ((mode == BLKmode) | |
8841 | ? expr_size (TREE_OPERAND (exp, 0)) : NULL_RTX), | |
8842 | TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT); | |
8843 | } | |
bbf6f052 | 8844 | |
ca695ac9 JB |
8845 | /* Like compare but expects the values to compare as two rtx's. |
8846 | The decision as to signed or unsigned comparison must be made by the caller. | |
bbf6f052 | 8847 | |
ca695ac9 JB |
8848 | If MODE is BLKmode, SIZE is an RTX giving the size of the objects being |
8849 | compared. | |
bbf6f052 | 8850 | |
ca695ac9 JB |
8851 | If ALIGN is non-zero, it is the alignment of this type; if zero, the |
8852 | size of MODE should be used. */ | |
bbf6f052 | 8853 | |
ca695ac9 JB |
8854 | rtx |
8855 | compare_from_rtx (op0, op1, code, unsignedp, mode, size, align) | |
8856 | register rtx op0, op1; | |
8857 | enum rtx_code code; | |
8858 | int unsignedp; | |
8859 | enum machine_mode mode; | |
8860 | rtx size; | |
8861 | int align; | |
8862 | { | |
8863 | rtx tem; | |
bbf6f052 | 8864 | |
ca695ac9 JB |
8865 | /* If one operand is constant, make it the second one. Only do this |
8866 | if the other operand is not constant as well. */ | |
bbf6f052 | 8867 | |
ca695ac9 JB |
8868 | if ((CONSTANT_P (op0) && ! CONSTANT_P (op1)) |
8869 | || (GET_CODE (op0) == CONST_INT && GET_CODE (op1) != CONST_INT)) | |
8870 | { | |
8871 | tem = op0; | |
8872 | op0 = op1; | |
8873 | op1 = tem; | |
8874 | code = swap_condition (code); | |
8875 | } | |
bbf6f052 | 8876 | |
ca695ac9 | 8877 | if (flag_force_mem) |
bbf6f052 | 8878 | { |
ca695ac9 JB |
8879 | op0 = force_not_mem (op0); |
8880 | op1 = force_not_mem (op1); | |
8881 | } | |
bbf6f052 | 8882 | |
ca695ac9 | 8883 | do_pending_stack_adjust (); |
bbf6f052 | 8884 | |
ca695ac9 JB |
8885 | if (GET_CODE (op0) == CONST_INT && GET_CODE (op1) == CONST_INT |
8886 | && (tem = simplify_relational_operation (code, mode, op0, op1)) != 0) | |
8887 | return tem; | |
bbf6f052 | 8888 | |
ca695ac9 JB |
8889 | #if 0 |
8890 | /* There's no need to do this now that combine.c can eliminate lots of | |
8891 | sign extensions. This can be less efficient in certain cases on other | |
8892 | machines. */ | |
bbf6f052 | 8893 | |
ca695ac9 JB |
8894 | /* If this is a signed equality comparison, we can do it as an |
8895 | unsigned comparison since zero-extension is cheaper than sign | |
8896 | extension and comparisons with zero are done as unsigned. This is | |
8897 | the case even on machines that can do fast sign extension, since | |
8898 | zero-extension is easier to combine with other operations than | |
8899 | sign-extension is. If we are comparing against a constant, we must | |
8900 | convert it to what it would look like unsigned. */ | |
8901 | if ((code == EQ || code == NE) && ! unsignedp | |
8902 | && GET_MODE_BITSIZE (GET_MODE (op0)) <= HOST_BITS_PER_WIDE_INT) | |
8903 | { | |
8904 | if (GET_CODE (op1) == CONST_INT | |
8905 | && (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0))) != INTVAL (op1)) | |
8906 | op1 = GEN_INT (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0))); | |
8907 | unsignedp = 1; | |
bbf6f052 | 8908 | } |
ca695ac9 JB |
8909 | #endif |
8910 | ||
8911 | emit_cmp_insn (op0, op1, code, size, mode, unsignedp, align); | |
bbf6f052 | 8912 | |
ca695ac9 | 8913 | return gen_rtx (code, VOIDmode, cc0_rtx, const0_rtx); |
bbf6f052 RK |
8914 | } |
8915 | \f | |
ca695ac9 JB |
8916 | /* Generate code to calculate EXP using a store-flag instruction |
8917 | and return an rtx for the result. EXP is either a comparison | |
8918 | or a TRUTH_NOT_EXPR whose operand is a comparison. | |
bbf6f052 | 8919 | |
ca695ac9 | 8920 | If TARGET is nonzero, store the result there if convenient. |
bbf6f052 | 8921 | |
ca695ac9 JB |
8922 | If ONLY_CHEAP is non-zero, only do this if it is likely to be very |
8923 | cheap. | |
bbf6f052 | 8924 | |
ca695ac9 JB |
8925 | Return zero if there is no suitable set-flag instruction |
8926 | available on this machine. | |
bbf6f052 | 8927 | |
ca695ac9 JB |
8928 | Once expand_expr has been called on the arguments of the comparison, |
8929 | we are committed to doing the store flag, since it is not safe to | |
8930 | re-evaluate the expression. We emit the store-flag insn by calling | |
8931 | emit_store_flag, but only expand the arguments if we have a reason | |
8932 | to believe that emit_store_flag will be successful. If we think that | |
8933 | it will, but it isn't, we have to simulate the store-flag with a | |
8934 | set/jump/set sequence. */ | |
bbf6f052 | 8935 | |
ca695ac9 JB |
8936 | static rtx |
8937 | do_store_flag (exp, target, mode, only_cheap) | |
8938 | tree exp; | |
8939 | rtx target; | |
8940 | enum machine_mode mode; | |
8941 | int only_cheap; | |
bbf6f052 | 8942 | { |
ca695ac9 JB |
8943 | enum rtx_code code; |
8944 | tree arg0, arg1, type; | |
8945 | tree tem; | |
8946 | enum machine_mode operand_mode; | |
8947 | int invert = 0; | |
8948 | int unsignedp; | |
8949 | rtx op0, op1; | |
8950 | enum insn_code icode; | |
8951 | rtx subtarget = target; | |
8952 | rtx result, label, pattern, jump_pat; | |
bbf6f052 | 8953 | |
ca695ac9 JB |
8954 | /* If this is a TRUTH_NOT_EXPR, set a flag indicating we must invert the |
8955 | result at the end. We can't simply invert the test since it would | |
8956 | have already been inverted if it were valid. This case occurs for | |
8957 | some floating-point comparisons. */ | |
8958 | ||
8959 | if (TREE_CODE (exp) == TRUTH_NOT_EXPR) | |
8960 | invert = 1, exp = TREE_OPERAND (exp, 0); | |
8961 | ||
8962 | arg0 = TREE_OPERAND (exp, 0); | |
8963 | arg1 = TREE_OPERAND (exp, 1); | |
8964 | type = TREE_TYPE (arg0); | |
8965 | operand_mode = TYPE_MODE (type); | |
8966 | unsignedp = TREE_UNSIGNED (type); | |
8967 | ||
8968 | /* We won't bother with BLKmode store-flag operations because it would mean | |
8969 | passing a lot of information to emit_store_flag. */ | |
8970 | if (operand_mode == BLKmode) | |
8971 | return 0; | |
8972 | ||
8973 | STRIP_NOPS (arg0); | |
8974 | STRIP_NOPS (arg1); | |
8975 | ||
8976 | /* Get the rtx comparison code to use. We know that EXP is a comparison | |
8977 | operation of some type. Some comparisons against 1 and -1 can be | |
8978 | converted to comparisons with zero. Do so here so that the tests | |
8979 | below will be aware that we have a comparison with zero. These | |
8980 | tests will not catch constants in the first operand, but constants | |
8981 | are rarely passed as the first operand. */ | |
8982 | ||
8983 | switch (TREE_CODE (exp)) | |
8984 | { | |
8985 | case EQ_EXPR: | |
8986 | code = EQ; | |
8987 | break; | |
8988 | case NE_EXPR: | |
8989 | code = NE; | |
8990 | break; | |
8991 | case LT_EXPR: | |
8992 | if (integer_onep (arg1)) | |
8993 | arg1 = integer_zero_node, code = unsignedp ? LEU : LE; | |
8994 | else | |
8995 | code = unsignedp ? LTU : LT; | |
8996 | break; | |
8997 | case LE_EXPR: | |
8998 | if (! unsignedp && integer_all_onesp (arg1)) | |
8999 | arg1 = integer_zero_node, code = LT; | |
9000 | else | |
9001 | code = unsignedp ? LEU : LE; | |
9002 | break; | |
9003 | case GT_EXPR: | |
9004 | if (! unsignedp && integer_all_onesp (arg1)) | |
9005 | arg1 = integer_zero_node, code = GE; | |
9006 | else | |
9007 | code = unsignedp ? GTU : GT; | |
9008 | break; | |
9009 | case GE_EXPR: | |
9010 | if (integer_onep (arg1)) | |
9011 | arg1 = integer_zero_node, code = unsignedp ? GTU : GT; | |
9012 | else | |
9013 | code = unsignedp ? GEU : GE; | |
9014 | break; | |
9015 | default: | |
9016 | abort (); | |
9017 | } | |
bbf6f052 | 9018 | |
ca695ac9 JB |
9019 | /* Put a constant second. */ |
9020 | if (TREE_CODE (arg0) == REAL_CST || TREE_CODE (arg0) == INTEGER_CST) | |
bbf6f052 | 9021 | { |
ca695ac9 JB |
9022 | tem = arg0; arg0 = arg1; arg1 = tem; |
9023 | code = swap_condition (code); | |
bbf6f052 | 9024 | } |
bbf6f052 | 9025 | |
ca695ac9 JB |
9026 | /* If this is an equality or inequality test of a single bit, we can |
9027 | do this by shifting the bit being tested to the low-order bit and | |
9028 | masking the result with the constant 1. If the condition was EQ, | |
9029 | we xor it with 1. This does not require an scc insn and is faster | |
9030 | than an scc insn even if we have it. */ | |
bbf6f052 | 9031 | |
ca695ac9 JB |
9032 | if ((code == NE || code == EQ) |
9033 | && TREE_CODE (arg0) == BIT_AND_EXPR && integer_zerop (arg1) | |
9034 | && integer_pow2p (TREE_OPERAND (arg0, 1)) | |
9035 | && TYPE_PRECISION (type) <= HOST_BITS_PER_WIDE_INT) | |
9036 | { | |
9037 | tree inner = TREE_OPERAND (arg0, 0); | |
9038 | int bitnum = exact_log2 (INTVAL (expand_expr (TREE_OPERAND (arg0, 1), | |
9039 | NULL_RTX, VOIDmode, 0))); | |
9040 | int ops_unsignedp; | |
bbf6f052 | 9041 | |
ca695ac9 JB |
9042 | /* If INNER is a right shift of a constant and it plus BITNUM does |
9043 | not overflow, adjust BITNUM and INNER. */ | |
bbf6f052 | 9044 | |
ca695ac9 JB |
9045 | if (TREE_CODE (inner) == RSHIFT_EXPR |
9046 | && TREE_CODE (TREE_OPERAND (inner, 1)) == INTEGER_CST | |
9047 | && TREE_INT_CST_HIGH (TREE_OPERAND (inner, 1)) == 0 | |
9048 | && (bitnum + TREE_INT_CST_LOW (TREE_OPERAND (inner, 1)) | |
9049 | < TYPE_PRECISION (type))) | |
9050 | { | |
9051 | bitnum +=TREE_INT_CST_LOW (TREE_OPERAND (inner, 1)); | |
9052 | inner = TREE_OPERAND (inner, 0); | |
9053 | } | |
bbf6f052 | 9054 | |
ca695ac9 JB |
9055 | /* If we are going to be able to omit the AND below, we must do our |
9056 | operations as unsigned. If we must use the AND, we have a choice. | |
9057 | Normally unsigned is faster, but for some machines signed is. */ | |
9058 | ops_unsignedp = (bitnum == TYPE_PRECISION (type) - 1 ? 1 | |
ad92c826 RK |
9059 | #ifdef LOAD_EXTEND_OP |
9060 | : (LOAD_EXTEND_OP (operand_mode) == SIGN_EXTEND ? 0 : 1) | |
ca695ac9 JB |
9061 | #else |
9062 | : 1 | |
9063 | #endif | |
9064 | ); | |
bbf6f052 | 9065 | |
ca695ac9 JB |
9066 | if (subtarget == 0 || GET_CODE (subtarget) != REG |
9067 | || GET_MODE (subtarget) != operand_mode | |
9068 | || ! safe_from_p (subtarget, inner)) | |
9069 | subtarget = 0; | |
e7c33f54 | 9070 | |
ca695ac9 | 9071 | op0 = expand_expr (inner, subtarget, VOIDmode, 0); |
bbf6f052 | 9072 | |
ca695ac9 JB |
9073 | if (bitnum != 0) |
9074 | op0 = expand_shift (RSHIFT_EXPR, GET_MODE (op0), op0, | |
0c316b20 | 9075 | size_int (bitnum), subtarget, ops_unsignedp); |
bbf6f052 | 9076 | |
ca695ac9 JB |
9077 | if (GET_MODE (op0) != mode) |
9078 | op0 = convert_to_mode (mode, op0, ops_unsignedp); | |
bbf6f052 | 9079 | |
ca695ac9 | 9080 | if ((code == EQ && ! invert) || (code == NE && invert)) |
0c316b20 | 9081 | op0 = expand_binop (mode, xor_optab, op0, const1_rtx, subtarget, |
ca695ac9 | 9082 | ops_unsignedp, OPTAB_LIB_WIDEN); |
bbf6f052 | 9083 | |
ca695ac9 JB |
9084 | /* Put the AND last so it can combine with more things. */ |
9085 | if (bitnum != TYPE_PRECISION (type) - 1) | |
0c316b20 | 9086 | op0 = expand_and (op0, const1_rtx, subtarget); |
bbf6f052 | 9087 | |
ca695ac9 JB |
9088 | return op0; |
9089 | } | |
bbf6f052 | 9090 | |
ca695ac9 JB |
9091 | /* Now see if we are likely to be able to do this. Return if not. */ |
9092 | if (! can_compare_p (operand_mode)) | |
9093 | return 0; | |
9094 | icode = setcc_gen_code[(int) code]; | |
9095 | if (icode == CODE_FOR_nothing | |
9096 | || (only_cheap && insn_operand_mode[(int) icode][0] != mode)) | |
9097 | { | |
9098 | /* We can only do this if it is one of the special cases that | |
9099 | can be handled without an scc insn. */ | |
9100 | if ((code == LT && integer_zerop (arg1)) | |
9101 | || (! only_cheap && code == GE && integer_zerop (arg1))) | |
9102 | ; | |
9103 | else if (BRANCH_COST >= 0 | |
9104 | && ! only_cheap && (code == NE || code == EQ) | |
9105 | && TREE_CODE (type) != REAL_TYPE | |
9106 | && ((abs_optab->handlers[(int) operand_mode].insn_code | |
9107 | != CODE_FOR_nothing) | |
9108 | || (ffs_optab->handlers[(int) operand_mode].insn_code | |
9109 | != CODE_FOR_nothing))) | |
9110 | ; | |
9111 | else | |
9112 | return 0; | |
9113 | } | |
9114 | ||
9115 | preexpand_calls (exp); | |
9116 | if (subtarget == 0 || GET_CODE (subtarget) != REG | |
9117 | || GET_MODE (subtarget) != operand_mode | |
9118 | || ! safe_from_p (subtarget, arg1)) | |
9119 | subtarget = 0; | |
bbf6f052 | 9120 | |
ca695ac9 JB |
9121 | op0 = expand_expr (arg0, subtarget, VOIDmode, 0); |
9122 | op1 = expand_expr (arg1, NULL_RTX, VOIDmode, 0); | |
bbf6f052 | 9123 | |
ca695ac9 JB |
9124 | if (target == 0) |
9125 | target = gen_reg_rtx (mode); | |
bbf6f052 | 9126 | |
ca695ac9 JB |
9127 | /* Pass copies of OP0 and OP1 in case they contain a QUEUED. This is safe |
9128 | because, if the emit_store_flag does anything it will succeed and | |
9129 | OP0 and OP1 will not be used subsequently. */ | |
bbf6f052 | 9130 | |
ca695ac9 JB |
9131 | result = emit_store_flag (target, code, |
9132 | queued_subexp_p (op0) ? copy_rtx (op0) : op0, | |
9133 | queued_subexp_p (op1) ? copy_rtx (op1) : op1, | |
9134 | operand_mode, unsignedp, 1); | |
bbf6f052 | 9135 | |
ca695ac9 JB |
9136 | if (result) |
9137 | { | |
9138 | if (invert) | |
9139 | result = expand_binop (mode, xor_optab, result, const1_rtx, | |
9140 | result, 0, OPTAB_LIB_WIDEN); | |
9141 | return result; | |
9142 | } | |
bbf6f052 | 9143 | |
ca695ac9 JB |
9144 | /* If this failed, we have to do this with set/compare/jump/set code. */ |
9145 | if (target == 0 || GET_CODE (target) != REG | |
9146 | || reg_mentioned_p (target, op0) || reg_mentioned_p (target, op1)) | |
9147 | target = gen_reg_rtx (GET_MODE (target)); | |
bbf6f052 | 9148 | |
ca695ac9 JB |
9149 | emit_move_insn (target, invert ? const0_rtx : const1_rtx); |
9150 | result = compare_from_rtx (op0, op1, code, unsignedp, | |
9151 | operand_mode, NULL_RTX, 0); | |
9152 | if (GET_CODE (result) == CONST_INT) | |
9153 | return (((result == const0_rtx && ! invert) | |
9154 | || (result != const0_rtx && invert)) | |
9155 | ? const0_rtx : const1_rtx); | |
bbf6f052 | 9156 | |
ca695ac9 JB |
9157 | label = gen_label_rtx (); |
9158 | if (bcc_gen_fctn[(int) code] == 0) | |
9159 | abort (); | |
bbf6f052 | 9160 | |
ca695ac9 JB |
9161 | emit_jump_insn ((*bcc_gen_fctn[(int) code]) (label)); |
9162 | emit_move_insn (target, invert ? const1_rtx : const0_rtx); | |
9163 | emit_label (label); | |
bbf6f052 | 9164 | |
ca695ac9 JB |
9165 | return target; |
9166 | } | |
9167 | \f | |
9168 | /* Generate a tablejump instruction (used for switch statements). */ | |
bbf6f052 | 9169 | |
ca695ac9 | 9170 | #ifdef HAVE_tablejump |
bbf6f052 | 9171 | |
ca695ac9 JB |
9172 | /* INDEX is the value being switched on, with the lowest value |
9173 | in the table already subtracted. | |
9174 | MODE is its expected mode (needed if INDEX is constant). | |
9175 | RANGE is the length of the jump table. | |
9176 | TABLE_LABEL is a CODE_LABEL rtx for the table itself. | |
bbf6f052 | 9177 | |
ca695ac9 JB |
9178 | DEFAULT_LABEL is a CODE_LABEL rtx to jump to if the |
9179 | index value is out of range. */ | |
bbf6f052 | 9180 | |
ca695ac9 JB |
9181 | void |
9182 | do_tablejump (index, mode, range, table_label, default_label) | |
9183 | rtx index, range, table_label, default_label; | |
9184 | enum machine_mode mode; | |
9185 | { | |
9186 | register rtx temp, vector; | |
bbf6f052 | 9187 | |
ca695ac9 JB |
9188 | /* Do an unsigned comparison (in the proper mode) between the index |
9189 | expression and the value which represents the length of the range. | |
9190 | Since we just finished subtracting the lower bound of the range | |
9191 | from the index expression, this comparison allows us to simultaneously | |
9192 | check that the original index expression value is both greater than | |
9193 | or equal to the minimum value of the range and less than or equal to | |
9194 | the maximum value of the range. */ | |
bbf6f052 | 9195 | |
bf500664 RK |
9196 | emit_cmp_insn (index, range, GTU, NULL_RTX, mode, 1, 0); |
9197 | emit_jump_insn (gen_bgtu (default_label)); | |
bbf6f052 | 9198 | |
ca695ac9 JB |
9199 | /* If index is in range, it must fit in Pmode. |
9200 | Convert to Pmode so we can index with it. */ | |
9201 | if (mode != Pmode) | |
9202 | index = convert_to_mode (Pmode, index, 1); | |
bbf6f052 | 9203 | |
ca695ac9 JB |
9204 | /* Don't let a MEM slip thru, because then INDEX that comes |
9205 | out of PIC_CASE_VECTOR_ADDRESS won't be a valid address, | |
9206 | and break_out_memory_refs will go to work on it and mess it up. */ | |
9207 | #ifdef PIC_CASE_VECTOR_ADDRESS | |
9208 | if (flag_pic && GET_CODE (index) != REG) | |
9209 | index = copy_to_mode_reg (Pmode, index); | |
9210 | #endif | |
bbf6f052 | 9211 | |
ca695ac9 JB |
9212 | /* If flag_force_addr were to affect this address |
9213 | it could interfere with the tricky assumptions made | |
9214 | about addresses that contain label-refs, | |
9215 | which may be valid only very near the tablejump itself. */ | |
9216 | /* ??? The only correct use of CASE_VECTOR_MODE is the one inside the | |
9217 | GET_MODE_SIZE, because this indicates how large insns are. The other | |
9218 | uses should all be Pmode, because they are addresses. This code | |
9219 | could fail if addresses and insns are not the same size. */ | |
9220 | index = gen_rtx (PLUS, Pmode, | |
9221 | gen_rtx (MULT, Pmode, index, | |
9222 | GEN_INT (GET_MODE_SIZE (CASE_VECTOR_MODE))), | |
9223 | gen_rtx (LABEL_REF, Pmode, table_label)); | |
9224 | #ifdef PIC_CASE_VECTOR_ADDRESS | |
9225 | if (flag_pic) | |
9226 | index = PIC_CASE_VECTOR_ADDRESS (index); | |
9227 | else | |
9228 | #endif | |
9229 | index = memory_address_noforce (CASE_VECTOR_MODE, index); | |
9230 | temp = gen_reg_rtx (CASE_VECTOR_MODE); | |
9231 | vector = gen_rtx (MEM, CASE_VECTOR_MODE, index); | |
9232 | RTX_UNCHANGING_P (vector) = 1; | |
9233 | convert_move (temp, vector, 0); | |
bbf6f052 | 9234 | |
ca695ac9 | 9235 | emit_jump_insn (gen_tablejump (temp, table_label)); |
bbf6f052 | 9236 | |
ca695ac9 JB |
9237 | #ifndef CASE_VECTOR_PC_RELATIVE |
9238 | /* If we are generating PIC code or if the table is PC-relative, the | |
9239 | table and JUMP_INSN must be adjacent, so don't output a BARRIER. */ | |
9240 | if (! flag_pic) | |
9241 | emit_barrier (); | |
bbf6f052 | 9242 | #endif |
ca695ac9 | 9243 | } |
bbf6f052 | 9244 | |
ca695ac9 | 9245 | #endif /* HAVE_tablejump */ |
bbf6f052 | 9246 | |
bbf6f052 | 9247 | |
ca695ac9 JB |
9248 | /* Emit a suitable bytecode to load a value from memory, assuming a pointer |
9249 | to that value is on the top of the stack. The resulting type is TYPE, and | |
9250 | the source declaration is DECL. */ | |
bbf6f052 | 9251 | |
ca695ac9 JB |
9252 | void |
9253 | bc_load_memory (type, decl) | |
9254 | tree type, decl; | |
9255 | { | |
9256 | enum bytecode_opcode opcode; | |
9257 | ||
9258 | ||
9259 | /* Bit fields are special. We only know about signed and | |
9260 | unsigned ints, and enums. The latter are treated as | |
9261 | signed integers. */ | |
9262 | ||
9263 | if (DECL_BIT_FIELD (decl)) | |
9264 | if (TREE_CODE (type) == ENUMERAL_TYPE | |
9265 | || TREE_CODE (type) == INTEGER_TYPE) | |
9266 | opcode = TREE_UNSIGNED (type) ? zxloadBI : sxloadBI; | |
9267 | else | |
9268 | abort (); | |
9269 | else | |
9270 | /* See corresponding comment in bc_store_memory(). */ | |
9271 | if (TYPE_MODE (type) == BLKmode | |
9272 | || TYPE_MODE (type) == VOIDmode) | |
9273 | return; | |
9274 | else | |
6bd6178d | 9275 | opcode = mode_to_load_map [(int) TYPE_MODE (type)]; |
bbf6f052 | 9276 | |
ca695ac9 JB |
9277 | if (opcode == neverneverland) |
9278 | abort (); | |
9279 | ||
9280 | bc_emit_bytecode (opcode); | |
9281 | ||
9282 | #ifdef DEBUG_PRINT_CODE | |
9283 | fputc ('\n', stderr); | |
9284 | #endif | |
bbf6f052 | 9285 | } |
bbf6f052 | 9286 | |
bbf6f052 | 9287 | |
ca695ac9 JB |
9288 | /* Store the contents of the second stack slot to the address in the |
9289 | top stack slot. DECL is the declaration of the destination and is used | |
9290 | to determine whether we're dealing with a bitfield. */ | |
bbf6f052 | 9291 | |
ca695ac9 JB |
9292 | void |
9293 | bc_store_memory (type, decl) | |
9294 | tree type, decl; | |
9295 | { | |
9296 | enum bytecode_opcode opcode; | |
9297 | ||
9298 | ||
9299 | if (DECL_BIT_FIELD (decl)) | |
f81497d9 | 9300 | { |
ca695ac9 JB |
9301 | if (TREE_CODE (type) == ENUMERAL_TYPE |
9302 | || TREE_CODE (type) == INTEGER_TYPE) | |
9303 | opcode = sstoreBI; | |
f81497d9 | 9304 | else |
ca695ac9 | 9305 | abort (); |
f81497d9 | 9306 | } |
ca695ac9 JB |
9307 | else |
9308 | if (TYPE_MODE (type) == BLKmode) | |
9309 | { | |
9310 | /* Copy structure. This expands to a block copy instruction, storeBLK. | |
9311 | In addition to the arguments expected by the other store instructions, | |
9312 | it also expects a type size (SImode) on top of the stack, which is the | |
9313 | structure size in size units (usually bytes). The two first arguments | |
9314 | are already on the stack; so we just put the size on level 1. For some | |
9315 | other languages, the size may be variable, this is why we don't encode | |
9316 | it as a storeBLK literal, but rather treat it as a full-fledged expression. */ | |
9317 | ||
9318 | bc_expand_expr (TYPE_SIZE (type)); | |
9319 | opcode = storeBLK; | |
9320 | } | |
9321 | else | |
6bd6178d | 9322 | opcode = mode_to_store_map [(int) TYPE_MODE (type)]; |
f81497d9 | 9323 | |
ca695ac9 JB |
9324 | if (opcode == neverneverland) |
9325 | abort (); | |
9326 | ||
9327 | bc_emit_bytecode (opcode); | |
9328 | ||
9329 | #ifdef DEBUG_PRINT_CODE | |
9330 | fputc ('\n', stderr); | |
9331 | #endif | |
f81497d9 RS |
9332 | } |
9333 | ||
f81497d9 | 9334 | |
ca695ac9 JB |
9335 | /* Allocate local stack space sufficient to hold a value of the given |
9336 | SIZE at alignment boundary ALIGNMENT bits. ALIGNMENT must be an | |
9337 | integral power of 2. A special case is locals of type VOID, which | |
9338 | have size 0 and alignment 1 - any "voidish" SIZE or ALIGNMENT is | |
9339 | remapped into the corresponding attribute of SI. */ | |
9340 | ||
9341 | rtx | |
9342 | bc_allocate_local (size, alignment) | |
9343 | int size, alignment; | |
f81497d9 | 9344 | { |
ca695ac9 JB |
9345 | rtx retval; |
9346 | int byte_alignment; | |
f81497d9 | 9347 | |
ca695ac9 JB |
9348 | if (size < 0) |
9349 | abort (); | |
f81497d9 | 9350 | |
ca695ac9 JB |
9351 | /* Normalize size and alignment */ |
9352 | if (!size) | |
9353 | size = UNITS_PER_WORD; | |
bbf6f052 | 9354 | |
ca695ac9 JB |
9355 | if (alignment < BITS_PER_UNIT) |
9356 | byte_alignment = 1 << (INT_ALIGN - 1); | |
9357 | else | |
9358 | /* Align */ | |
9359 | byte_alignment = alignment / BITS_PER_UNIT; | |
bbf6f052 | 9360 | |
ca695ac9 JB |
9361 | if (local_vars_size & (byte_alignment - 1)) |
9362 | local_vars_size += byte_alignment - (local_vars_size & (byte_alignment - 1)); | |
bbf6f052 | 9363 | |
ca695ac9 JB |
9364 | retval = bc_gen_rtx ((char *) 0, local_vars_size, (struct bc_label *) 0); |
9365 | local_vars_size += size; | |
bbf6f052 | 9366 | |
ca695ac9 | 9367 | return retval; |
bbf6f052 RK |
9368 | } |
9369 | ||
bbf6f052 | 9370 | |
ca695ac9 JB |
9371 | /* Allocate variable-sized local array. Variable-sized arrays are |
9372 | actually pointers to the address in memory where they are stored. */ | |
9373 | ||
9374 | rtx | |
9375 | bc_allocate_variable_array (size) | |
9376 | tree size; | |
bbf6f052 | 9377 | { |
ca695ac9 JB |
9378 | rtx retval; |
9379 | const int ptralign = (1 << (PTR_ALIGN - 1)); | |
bbf6f052 | 9380 | |
ca695ac9 JB |
9381 | /* Align pointer */ |
9382 | if (local_vars_size & ptralign) | |
9383 | local_vars_size += ptralign - (local_vars_size & ptralign); | |
bbf6f052 | 9384 | |
ca695ac9 JB |
9385 | /* Note down local space needed: pointer to block; also return |
9386 | dummy rtx */ | |
bbf6f052 | 9387 | |
ca695ac9 JB |
9388 | retval = bc_gen_rtx ((char *) 0, local_vars_size, (struct bc_label *) 0); |
9389 | local_vars_size += POINTER_SIZE / BITS_PER_UNIT; | |
9390 | return retval; | |
bbf6f052 | 9391 | } |
bbf6f052 | 9392 | |
bbf6f052 | 9393 | |
ca695ac9 JB |
9394 | /* Push the machine address for the given external variable offset. */ |
9395 | void | |
9396 | bc_load_externaddr (externaddr) | |
9397 | rtx externaddr; | |
9398 | { | |
9399 | bc_emit_bytecode (constP); | |
e7a42772 JB |
9400 | bc_emit_code_labelref (BYTECODE_LABEL (externaddr), |
9401 | BYTECODE_BC_LABEL (externaddr)->offset); | |
bbf6f052 | 9402 | |
ca695ac9 JB |
9403 | #ifdef DEBUG_PRINT_CODE |
9404 | fputc ('\n', stderr); | |
9405 | #endif | |
bbf6f052 RK |
9406 | } |
9407 | ||
bbf6f052 | 9408 | |
ca695ac9 JB |
9409 | static char * |
9410 | bc_strdup (s) | |
9411 | char *s; | |
bbf6f052 | 9412 | { |
5e70898c RS |
9413 | char *new = (char *) xmalloc ((strlen (s) + 1) * sizeof *s); |
9414 | strcpy (new, s); | |
9415 | return new; | |
ca695ac9 | 9416 | } |
bbf6f052 | 9417 | |
bbf6f052 | 9418 | |
ca695ac9 JB |
9419 | /* Like above, but expects an IDENTIFIER. */ |
9420 | void | |
9421 | bc_load_externaddr_id (id, offset) | |
9422 | tree id; | |
9423 | int offset; | |
9424 | { | |
9425 | if (!IDENTIFIER_POINTER (id)) | |
9426 | abort (); | |
bbf6f052 | 9427 | |
ca695ac9 JB |
9428 | bc_emit_bytecode (constP); |
9429 | bc_emit_code_labelref (bc_xstrdup (IDENTIFIER_POINTER (id)), offset); | |
bbf6f052 | 9430 | |
ca695ac9 JB |
9431 | #ifdef DEBUG_PRINT_CODE |
9432 | fputc ('\n', stderr); | |
9433 | #endif | |
9434 | } | |
bbf6f052 | 9435 | |
bbf6f052 | 9436 | |
ca695ac9 JB |
9437 | /* Push the machine address for the given local variable offset. */ |
9438 | void | |
9439 | bc_load_localaddr (localaddr) | |
9440 | rtx localaddr; | |
9441 | { | |
e7a42772 | 9442 | bc_emit_instruction (localP, (HOST_WIDE_INT) BYTECODE_BC_LABEL (localaddr)->offset); |
bbf6f052 | 9443 | } |
bbf6f052 | 9444 | |
bbf6f052 | 9445 | |
ca695ac9 JB |
9446 | /* Push the machine address for the given parameter offset. |
9447 | NOTE: offset is in bits. */ | |
9448 | void | |
9449 | bc_load_parmaddr (parmaddr) | |
9450 | rtx parmaddr; | |
bbf6f052 | 9451 | { |
e7a42772 JB |
9452 | bc_emit_instruction (argP, ((HOST_WIDE_INT) BYTECODE_BC_LABEL (parmaddr)->offset |
9453 | / BITS_PER_UNIT)); | |
ca695ac9 | 9454 | } |
bbf6f052 | 9455 | |
ca695ac9 JB |
9456 | |
9457 | /* Convert a[i] into *(a + i). */ | |
9458 | tree | |
9459 | bc_canonicalize_array_ref (exp) | |
9460 | tree exp; | |
9461 | { | |
9462 | tree type = TREE_TYPE (exp); | |
9463 | tree array_adr = build1 (ADDR_EXPR, TYPE_POINTER_TO (type), | |
9464 | TREE_OPERAND (exp, 0)); | |
9465 | tree index = TREE_OPERAND (exp, 1); | |
9466 | ||
9467 | ||
9468 | /* Convert the integer argument to a type the same size as a pointer | |
9469 | so the multiply won't overflow spuriously. */ | |
9470 | ||
9471 | if (TYPE_PRECISION (TREE_TYPE (index)) != POINTER_SIZE) | |
9472 | index = convert (type_for_size (POINTER_SIZE, 0), index); | |
9473 | ||
9474 | /* The array address isn't volatile even if the array is. | |
9475 | (Of course this isn't terribly relevant since the bytecode | |
9476 | translator treats nearly everything as volatile anyway.) */ | |
9477 | TREE_THIS_VOLATILE (array_adr) = 0; | |
9478 | ||
9479 | return build1 (INDIRECT_REF, type, | |
9480 | fold (build (PLUS_EXPR, | |
9481 | TYPE_POINTER_TO (type), | |
9482 | array_adr, | |
9483 | fold (build (MULT_EXPR, | |
9484 | TYPE_POINTER_TO (type), | |
9485 | index, | |
9486 | size_in_bytes (type)))))); | |
bbf6f052 RK |
9487 | } |
9488 | ||
bbf6f052 | 9489 | |
ca695ac9 JB |
9490 | /* Load the address of the component referenced by the given |
9491 | COMPONENT_REF expression. | |
bbf6f052 | 9492 | |
ca695ac9 | 9493 | Returns innermost lvalue. */ |
bbf6f052 | 9494 | |
ca695ac9 JB |
9495 | tree |
9496 | bc_expand_component_address (exp) | |
9497 | tree exp; | |
bbf6f052 | 9498 | { |
ca695ac9 JB |
9499 | tree tem, chain; |
9500 | enum machine_mode mode; | |
9501 | int bitpos = 0; | |
9502 | HOST_WIDE_INT SIval; | |
a7c5971a | 9503 | |
bbf6f052 | 9504 | |
ca695ac9 JB |
9505 | tem = TREE_OPERAND (exp, 1); |
9506 | mode = DECL_MODE (tem); | |
bbf6f052 | 9507 | |
ca695ac9 JB |
9508 | |
9509 | /* Compute cumulative bit offset for nested component refs | |
9510 | and array refs, and find the ultimate containing object. */ | |
9511 | ||
9512 | for (tem = exp;; tem = TREE_OPERAND (tem, 0)) | |
bbf6f052 | 9513 | { |
ca695ac9 JB |
9514 | if (TREE_CODE (tem) == COMPONENT_REF) |
9515 | bitpos += TREE_INT_CST_LOW (DECL_FIELD_BITPOS (TREE_OPERAND (tem, 1))); | |
9516 | else | |
9517 | if (TREE_CODE (tem) == ARRAY_REF | |
9518 | && TREE_CODE (TREE_OPERAND (tem, 1)) == INTEGER_CST | |
9519 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (tem))) == INTEGER_CST) | |
bbf6f052 | 9520 | |
ca695ac9 JB |
9521 | bitpos += (TREE_INT_CST_LOW (TREE_OPERAND (tem, 1)) |
9522 | * TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (tem))) | |
9523 | /* * TYPE_SIZE_UNIT (TREE_TYPE (tem)) */); | |
9524 | else | |
9525 | break; | |
9526 | } | |
bbf6f052 | 9527 | |
c02bd5d9 | 9528 | bc_expand_expr (tem); |
bbf6f052 | 9529 | |
cd1b4b44 | 9530 | |
ca695ac9 JB |
9531 | /* For bitfields also push their offset and size */ |
9532 | if (DECL_BIT_FIELD (TREE_OPERAND (exp, 1))) | |
9533 | bc_push_offset_and_size (bitpos, /* DECL_SIZE_UNIT */ (TREE_OPERAND (exp, 1))); | |
9534 | else | |
9535 | if (SIval = bitpos / BITS_PER_UNIT) | |
9536 | bc_emit_instruction (addconstPSI, SIval); | |
bbf6f052 | 9537 | |
ca695ac9 | 9538 | return (TREE_OPERAND (exp, 1)); |
bbf6f052 | 9539 | } |
e7c33f54 | 9540 | |
bbf6f052 | 9541 | |
ca695ac9 JB |
9542 | /* Emit code to push two SI constants */ |
9543 | void | |
9544 | bc_push_offset_and_size (offset, size) | |
9545 | HOST_WIDE_INT offset, size; | |
9546 | { | |
9547 | bc_emit_instruction (constSI, offset); | |
9548 | bc_emit_instruction (constSI, size); | |
9549 | } | |
bbf6f052 | 9550 | |
bbf6f052 | 9551 | |
ca695ac9 JB |
9552 | /* Emit byte code to push the address of the given lvalue expression to |
9553 | the stack. If it's a bit field, we also push offset and size info. | |
bbf6f052 | 9554 | |
ca695ac9 JB |
9555 | Returns innermost component, which allows us to determine not only |
9556 | its type, but also whether it's a bitfield. */ | |
9557 | ||
9558 | tree | |
9559 | bc_expand_address (exp) | |
bbf6f052 | 9560 | tree exp; |
bbf6f052 | 9561 | { |
ca695ac9 JB |
9562 | /* Safeguard */ |
9563 | if (!exp || TREE_CODE (exp) == ERROR_MARK) | |
9564 | return (exp); | |
bbf6f052 | 9565 | |
e7c33f54 | 9566 | |
ca695ac9 JB |
9567 | switch (TREE_CODE (exp)) |
9568 | { | |
9569 | case ARRAY_REF: | |
e7c33f54 | 9570 | |
ca695ac9 | 9571 | return (bc_expand_address (bc_canonicalize_array_ref (exp))); |
e7c33f54 | 9572 | |
ca695ac9 | 9573 | case COMPONENT_REF: |
bbf6f052 | 9574 | |
ca695ac9 | 9575 | return (bc_expand_component_address (exp)); |
bbf6f052 | 9576 | |
ca695ac9 | 9577 | case INDIRECT_REF: |
bbf6f052 | 9578 | |
ca695ac9 JB |
9579 | bc_expand_expr (TREE_OPERAND (exp, 0)); |
9580 | ||
9581 | /* For variable-sized types: retrieve pointer. Sometimes the | |
9582 | TYPE_SIZE tree is NULL. Is this a bug or a feature? Let's | |
9583 | also make sure we have an operand, just in case... */ | |
9584 | ||
9585 | if (TREE_OPERAND (exp, 0) | |
9586 | && TYPE_SIZE (TREE_TYPE (TREE_OPERAND (exp, 0))) | |
9587 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_OPERAND (exp, 0)))) != INTEGER_CST) | |
9588 | bc_emit_instruction (loadP); | |
9589 | ||
9590 | /* If packed, also return offset and size */ | |
9591 | if (DECL_BIT_FIELD (TREE_OPERAND (exp, 0))) | |
9592 | ||
9593 | bc_push_offset_and_size (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (TREE_OPERAND (exp, 0))), | |
9594 | TREE_INT_CST_LOW (DECL_SIZE (TREE_OPERAND (exp, 0)))); | |
9595 | ||
9596 | return (TREE_OPERAND (exp, 0)); | |
9597 | ||
9598 | case FUNCTION_DECL: | |
9599 | ||
e7a42772 JB |
9600 | bc_load_externaddr_id (DECL_ASSEMBLER_NAME (exp), |
9601 | BYTECODE_BC_LABEL (DECL_RTL (exp))->offset); | |
bbf6f052 | 9602 | break; |
ca695ac9 JB |
9603 | |
9604 | case PARM_DECL: | |
9605 | ||
9606 | bc_load_parmaddr (DECL_RTL (exp)); | |
9607 | ||
9608 | /* For variable-sized types: retrieve pointer */ | |
9609 | if (TYPE_SIZE (TREE_TYPE (exp)) | |
9610 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) != INTEGER_CST) | |
9611 | bc_emit_instruction (loadP); | |
9612 | ||
9613 | /* If packed, also return offset and size */ | |
9614 | if (DECL_BIT_FIELD (exp)) | |
9615 | bc_push_offset_and_size (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (exp)), | |
9616 | TREE_INT_CST_LOW (DECL_SIZE (exp))); | |
9617 | ||
bbf6f052 | 9618 | break; |
ca695ac9 JB |
9619 | |
9620 | case RESULT_DECL: | |
9621 | ||
9622 | bc_emit_instruction (returnP); | |
bbf6f052 | 9623 | break; |
ca695ac9 JB |
9624 | |
9625 | case VAR_DECL: | |
9626 | ||
9627 | #if 0 | |
e7a42772 | 9628 | if (BYTECODE_LABEL (DECL_RTL (exp))) |
ca695ac9 JB |
9629 | bc_load_externaddr (DECL_RTL (exp)); |
9630 | #endif | |
9631 | ||
9632 | if (DECL_EXTERNAL (exp)) | |
e7a42772 | 9633 | bc_load_externaddr_id (DECL_ASSEMBLER_NAME (exp), |
eb862a37 | 9634 | (BYTECODE_BC_LABEL (DECL_RTL (exp)))->offset); |
bbf6f052 | 9635 | else |
ca695ac9 JB |
9636 | bc_load_localaddr (DECL_RTL (exp)); |
9637 | ||
9638 | /* For variable-sized types: retrieve pointer */ | |
9639 | if (TYPE_SIZE (TREE_TYPE (exp)) | |
9640 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) != INTEGER_CST) | |
9641 | bc_emit_instruction (loadP); | |
9642 | ||
9643 | /* If packed, also return offset and size */ | |
9644 | if (DECL_BIT_FIELD (exp)) | |
9645 | bc_push_offset_and_size (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (exp)), | |
9646 | TREE_INT_CST_LOW (DECL_SIZE (exp))); | |
9647 | ||
bbf6f052 | 9648 | break; |
ca695ac9 JB |
9649 | |
9650 | case STRING_CST: | |
9651 | { | |
9652 | rtx r; | |
9653 | ||
9654 | bc_emit_bytecode (constP); | |
9655 | r = output_constant_def (exp); | |
e7a42772 | 9656 | bc_emit_code_labelref (BYTECODE_LABEL (r), BYTECODE_BC_LABEL (r)->offset); |
ca695ac9 JB |
9657 | |
9658 | #ifdef DEBUG_PRINT_CODE | |
9659 | fputc ('\n', stderr); | |
9660 | #endif | |
9661 | } | |
bbf6f052 | 9662 | break; |
ca695ac9 | 9663 | |
bbf6f052 | 9664 | default: |
bbf6f052 | 9665 | |
ca695ac9 JB |
9666 | abort(); |
9667 | break; | |
bbf6f052 RK |
9668 | } |
9669 | ||
ca695ac9 JB |
9670 | /* Most lvalues don't have components. */ |
9671 | return (exp); | |
9672 | } | |
bbf6f052 | 9673 | |
ca695ac9 JB |
9674 | |
9675 | /* Emit a type code to be used by the runtime support in handling | |
9676 | parameter passing. The type code consists of the machine mode | |
9677 | plus the minimal alignment shifted left 8 bits. */ | |
9678 | ||
9679 | tree | |
9680 | bc_runtime_type_code (type) | |
9681 | tree type; | |
9682 | { | |
9683 | int val; | |
9684 | ||
9685 | switch (TREE_CODE (type)) | |
bbf6f052 | 9686 | { |
ca695ac9 JB |
9687 | case VOID_TYPE: |
9688 | case INTEGER_TYPE: | |
9689 | case REAL_TYPE: | |
9690 | case COMPLEX_TYPE: | |
9691 | case ENUMERAL_TYPE: | |
9692 | case POINTER_TYPE: | |
9693 | case RECORD_TYPE: | |
9694 | ||
6bd6178d | 9695 | val = (int) TYPE_MODE (type) | TYPE_ALIGN (type) << 8; |
ca695ac9 JB |
9696 | break; |
9697 | ||
9698 | case ERROR_MARK: | |
9699 | ||
9700 | val = 0; | |
9701 | break; | |
9702 | ||
9703 | default: | |
af508edd | 9704 | |
ca695ac9 JB |
9705 | abort (); |
9706 | } | |
9707 | return build_int_2 (val, 0); | |
9708 | } | |
af508edd | 9709 | |
af508edd | 9710 | |
ca695ac9 JB |
9711 | /* Generate constructor label */ |
9712 | char * | |
9713 | bc_gen_constr_label () | |
9714 | { | |
9715 | static int label_counter; | |
9716 | static char label[20]; | |
bbf6f052 | 9717 | |
ca695ac9 | 9718 | sprintf (label, "*LR%d", label_counter++); |
bbf6f052 | 9719 | |
ca695ac9 JB |
9720 | return (obstack_copy0 (&permanent_obstack, label, strlen (label))); |
9721 | } | |
bbf6f052 | 9722 | |
bbf6f052 | 9723 | |
ca695ac9 JB |
9724 | /* Evaluate constructor CONSTR and return pointer to it on level one. We |
9725 | expand the constructor data as static data, and push a pointer to it. | |
9726 | The pointer is put in the pointer table and is retrieved by a constP | |
9727 | bytecode instruction. We then loop and store each constructor member in | |
9728 | the corresponding component. Finally, we return the original pointer on | |
9729 | the stack. */ | |
af508edd | 9730 | |
ca695ac9 JB |
9731 | void |
9732 | bc_expand_constructor (constr) | |
9733 | tree constr; | |
9734 | { | |
9735 | char *l; | |
9736 | HOST_WIDE_INT ptroffs; | |
9737 | rtx constr_rtx; | |
bbf6f052 | 9738 | |
ca695ac9 JB |
9739 | |
9740 | /* Literal constructors are handled as constants, whereas | |
9741 | non-literals are evaluated and stored element by element | |
9742 | into the data segment. */ | |
9743 | ||
9744 | /* Allocate space in proper segment and push pointer to space on stack. | |
9745 | */ | |
bbf6f052 | 9746 | |
ca695ac9 | 9747 | l = bc_gen_constr_label (); |
bbf6f052 | 9748 | |
ca695ac9 | 9749 | if (TREE_CONSTANT (constr)) |
bbf6f052 | 9750 | { |
ca695ac9 JB |
9751 | text_section (); |
9752 | ||
9753 | bc_emit_const_labeldef (l); | |
9754 | bc_output_constructor (constr, int_size_in_bytes (TREE_TYPE (constr))); | |
bbf6f052 | 9755 | } |
ca695ac9 JB |
9756 | else |
9757 | { | |
9758 | data_section (); | |
bbf6f052 | 9759 | |
ca695ac9 JB |
9760 | bc_emit_data_labeldef (l); |
9761 | bc_output_data_constructor (constr); | |
9762 | } | |
bbf6f052 | 9763 | |
ca695ac9 JB |
9764 | |
9765 | /* Add reference to pointer table and recall pointer to stack; | |
9766 | this code is common for both types of constructors: literals | |
9767 | and non-literals. */ | |
bbf6f052 | 9768 | |
de7d9320 JB |
9769 | ptroffs = bc_define_pointer (l); |
9770 | bc_emit_instruction (constP, ptroffs); | |
d39985fa | 9771 | |
ca695ac9 JB |
9772 | /* This is all that has to be done if it's a literal. */ |
9773 | if (TREE_CONSTANT (constr)) | |
9774 | return; | |
bbf6f052 | 9775 | |
ca695ac9 JB |
9776 | |
9777 | /* At this point, we have the pointer to the structure on top of the stack. | |
9778 | Generate sequences of store_memory calls for the constructor. */ | |
9779 | ||
9780 | /* constructor type is structure */ | |
9781 | if (TREE_CODE (TREE_TYPE (constr)) == RECORD_TYPE) | |
e7c33f54 | 9782 | { |
ca695ac9 JB |
9783 | register tree elt; |
9784 | ||
9785 | /* If the constructor has fewer fields than the structure, | |
9786 | clear the whole structure first. */ | |
9787 | ||
9788 | if (list_length (CONSTRUCTOR_ELTS (constr)) | |
9789 | != list_length (TYPE_FIELDS (TREE_TYPE (constr)))) | |
9790 | { | |
6d6e61ce | 9791 | bc_emit_instruction (duplicate); |
ca695ac9 JB |
9792 | bc_emit_instruction (constSI, (HOST_WIDE_INT) int_size_in_bytes (TREE_TYPE (constr))); |
9793 | bc_emit_instruction (clearBLK); | |
9794 | } | |
9795 | ||
9796 | /* Store each element of the constructor into the corresponding | |
9797 | field of TARGET. */ | |
9798 | ||
9799 | for (elt = CONSTRUCTOR_ELTS (constr); elt; elt = TREE_CHAIN (elt)) | |
9800 | { | |
9801 | register tree field = TREE_PURPOSE (elt); | |
9802 | register enum machine_mode mode; | |
9803 | int bitsize; | |
9804 | int bitpos; | |
9805 | int unsignedp; | |
9806 | ||
9807 | bitsize = TREE_INT_CST_LOW (DECL_SIZE (field)) /* * DECL_SIZE_UNIT (field) */; | |
9808 | mode = DECL_MODE (field); | |
9809 | unsignedp = TREE_UNSIGNED (field); | |
9810 | ||
9811 | bitpos = TREE_INT_CST_LOW (DECL_FIELD_BITPOS (field)); | |
9812 | ||
9813 | bc_store_field (elt, bitsize, bitpos, mode, TREE_VALUE (elt), TREE_TYPE (TREE_VALUE (elt)), | |
9814 | /* The alignment of TARGET is | |
9815 | at least what its type requires. */ | |
9816 | VOIDmode, 0, | |
9817 | TYPE_ALIGN (TREE_TYPE (constr)) / BITS_PER_UNIT, | |
9818 | int_size_in_bytes (TREE_TYPE (constr))); | |
9819 | } | |
e7c33f54 | 9820 | } |
ca695ac9 JB |
9821 | else |
9822 | ||
9823 | /* Constructor type is array */ | |
9824 | if (TREE_CODE (TREE_TYPE (constr)) == ARRAY_TYPE) | |
9825 | { | |
9826 | register tree elt; | |
9827 | register int i; | |
9828 | tree domain = TYPE_DOMAIN (TREE_TYPE (constr)); | |
9829 | int minelt = TREE_INT_CST_LOW (TYPE_MIN_VALUE (domain)); | |
9830 | int maxelt = TREE_INT_CST_LOW (TYPE_MAX_VALUE (domain)); | |
9831 | tree elttype = TREE_TYPE (TREE_TYPE (constr)); | |
9832 | ||
9833 | /* If the constructor has fewer fields than the structure, | |
9834 | clear the whole structure first. */ | |
9835 | ||
9836 | if (list_length (CONSTRUCTOR_ELTS (constr)) < maxelt - minelt + 1) | |
9837 | { | |
6d6e61ce | 9838 | bc_emit_instruction (duplicate); |
ca695ac9 JB |
9839 | bc_emit_instruction (constSI, (HOST_WIDE_INT) int_size_in_bytes (TREE_TYPE (constr))); |
9840 | bc_emit_instruction (clearBLK); | |
9841 | } | |
9842 | ||
9843 | ||
9844 | /* Store each element of the constructor into the corresponding | |
9845 | element of TARGET, determined by counting the elements. */ | |
9846 | ||
9847 | for (elt = CONSTRUCTOR_ELTS (constr), i = 0; | |
9848 | elt; | |
9849 | elt = TREE_CHAIN (elt), i++) | |
9850 | { | |
9851 | register enum machine_mode mode; | |
9852 | int bitsize; | |
9853 | int bitpos; | |
9854 | int unsignedp; | |
9855 | ||
9856 | mode = TYPE_MODE (elttype); | |
9857 | bitsize = GET_MODE_BITSIZE (mode); | |
9858 | unsignedp = TREE_UNSIGNED (elttype); | |
9859 | ||
9860 | bitpos = (i * TREE_INT_CST_LOW (TYPE_SIZE (elttype)) | |
9861 | /* * TYPE_SIZE_UNIT (elttype) */ ); | |
9862 | ||
9863 | bc_store_field (elt, bitsize, bitpos, mode, | |
9864 | TREE_VALUE (elt), TREE_TYPE (TREE_VALUE (elt)), | |
9865 | /* The alignment of TARGET is | |
9866 | at least what its type requires. */ | |
9867 | VOIDmode, 0, | |
9868 | TYPE_ALIGN (TREE_TYPE (constr)) / BITS_PER_UNIT, | |
9869 | int_size_in_bytes (TREE_TYPE (constr))); | |
9870 | } | |
9871 | ||
9872 | } | |
9873 | } | |
bbf6f052 | 9874 | |
bbf6f052 | 9875 | |
ca695ac9 JB |
9876 | /* Store the value of EXP (an expression tree) into member FIELD of |
9877 | structure at address on stack, which has type TYPE, mode MODE and | |
9878 | occupies BITSIZE bits, starting BITPOS bits from the beginning of the | |
9879 | structure. | |
bbf6f052 | 9880 | |
ca695ac9 JB |
9881 | ALIGN is the alignment that TARGET is known to have, measured in bytes. |
9882 | TOTAL_SIZE is its size in bytes, or -1 if variable. */ | |
bbf6f052 | 9883 | |
ca695ac9 JB |
9884 | void |
9885 | bc_store_field (field, bitsize, bitpos, mode, exp, type, | |
9886 | value_mode, unsignedp, align, total_size) | |
9887 | int bitsize, bitpos; | |
9888 | enum machine_mode mode; | |
9889 | tree field, exp, type; | |
9890 | enum machine_mode value_mode; | |
9891 | int unsignedp; | |
9892 | int align; | |
9893 | int total_size; | |
9894 | { | |
bbf6f052 | 9895 | |
ca695ac9 JB |
9896 | /* Expand expression and copy pointer */ |
9897 | bc_expand_expr (exp); | |
9898 | bc_emit_instruction (over); | |
bbf6f052 | 9899 | |
bbf6f052 | 9900 | |
ca695ac9 JB |
9901 | /* If the component is a bit field, we cannot use addressing to access |
9902 | it. Use bit-field techniques to store in it. */ | |
bbf6f052 | 9903 | |
ca695ac9 JB |
9904 | if (DECL_BIT_FIELD (field)) |
9905 | { | |
9906 | bc_store_bit_field (bitpos, bitsize, unsignedp); | |
9907 | return; | |
9908 | } | |
9909 | else | |
9910 | /* Not bit field */ | |
9911 | { | |
9912 | HOST_WIDE_INT offset = bitpos / BITS_PER_UNIT; | |
9913 | ||
9914 | /* Advance pointer to the desired member */ | |
9915 | if (offset) | |
9916 | bc_emit_instruction (addconstPSI, offset); | |
9917 | ||
9918 | /* Store */ | |
9919 | bc_store_memory (type, field); | |
9920 | } | |
9921 | } | |
bbf6f052 | 9922 | |
ca695ac9 JB |
9923 | |
9924 | /* Store SI/SU in bitfield */ | |
bbf6f052 | 9925 | void |
ca695ac9 JB |
9926 | bc_store_bit_field (offset, size, unsignedp) |
9927 | int offset, size, unsignedp; | |
bbf6f052 | 9928 | { |
ca695ac9 JB |
9929 | /* Push bitfield offset and size */ |
9930 | bc_push_offset_and_size (offset, size); | |
bbf6f052 | 9931 | |
ca695ac9 JB |
9932 | /* Store */ |
9933 | bc_emit_instruction (sstoreBI); | |
9934 | } | |
e87b4f3f | 9935 | |
88d3b7f0 | 9936 | |
ca695ac9 JB |
9937 | /* Load SI/SU from bitfield */ |
9938 | void | |
9939 | bc_load_bit_field (offset, size, unsignedp) | |
9940 | int offset, size, unsignedp; | |
9941 | { | |
9942 | /* Push bitfield offset and size */ | |
9943 | bc_push_offset_and_size (offset, size); | |
88d3b7f0 | 9944 | |
ca695ac9 JB |
9945 | /* Load: sign-extend if signed, else zero-extend */ |
9946 | bc_emit_instruction (unsignedp ? zxloadBI : sxloadBI); | |
9947 | } | |
709f5be1 | 9948 | |
bbf6f052 | 9949 | |
ca695ac9 JB |
9950 | /* Adjust interpreter stack by NLEVELS. Positive means drop NLEVELS |
9951 | (adjust stack pointer upwards), negative means add that number of | |
9952 | levels (adjust the stack pointer downwards). Only positive values | |
9953 | normally make sense. */ | |
bbf6f052 | 9954 | |
ca695ac9 JB |
9955 | void |
9956 | bc_adjust_stack (nlevels) | |
9957 | int nlevels; | |
9958 | { | |
9959 | switch (nlevels) | |
9960 | { | |
9961 | case 0: | |
9962 | break; | |
9963 | ||
9964 | case 2: | |
9965 | bc_emit_instruction (drop); | |
9966 | ||
9967 | case 1: | |
9968 | bc_emit_instruction (drop); | |
9969 | break; | |
9970 | ||
9971 | default: | |
9972 | ||
9973 | bc_emit_instruction (adjstackSI, (HOST_WIDE_INT) nlevels); | |
9974 | stack_depth -= nlevels; | |
9975 | } | |
9976 | ||
a68c7608 RS |
9977 | #if defined (VALIDATE_STACK_FOR_BC) |
9978 | VALIDATE_STACK_FOR_BC (); | |
bbf6f052 RK |
9979 | #endif |
9980 | } |