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2055cea7 | 1 | /* Subroutines used by or related to instruction recognition. |
1f06ee8d | 2 | Copyright (C) 1987, 1988, 91-98, 1999 Free Software Foundation, Inc. |
2055cea7 RK |
3 | |
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU CC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
e99215a3 RK |
18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
2055cea7 RK |
20 | |
21 | ||
22 | #include "config.h" | |
670ee920 | 23 | #include "system.h" |
38a448ca | 24 | #include "rtl.h" |
2055cea7 RK |
25 | #include "insn-config.h" |
26 | #include "insn-attr.h" | |
27 | #include "insn-flags.h" | |
28 | #include "insn-codes.h" | |
29 | #include "recog.h" | |
30 | #include "regs.h" | |
31 | #include "hard-reg-set.h" | |
32 | #include "flags.h" | |
33 | #include "real.h" | |
7f7f8214 | 34 | #include "toplev.h" |
ca545bb5 | 35 | #include "basic-block.h" |
2055cea7 RK |
36 | |
37 | #ifndef STACK_PUSH_CODE | |
38 | #ifdef STACK_GROWS_DOWNWARD | |
39 | #define STACK_PUSH_CODE PRE_DEC | |
40 | #else | |
41 | #define STACK_PUSH_CODE PRE_INC | |
42 | #endif | |
43 | #endif | |
44 | ||
6fbe9bd8 RH |
45 | #ifndef STACK_POP_CODE |
46 | #ifdef STACK_GROWS_DOWNWARD | |
47 | #define STACK_POP_CODE POST_INC | |
48 | #else | |
49 | #define STACK_POP_CODE POST_DEC | |
50 | #endif | |
51 | #endif | |
52 | ||
61719ba7 BS |
53 | static void validate_replace_rtx_1 PROTO((rtx *, rtx, rtx, rtx)); |
54 | static rtx *find_single_use_1 PROTO((rtx, rtx *)); | |
55 | static rtx *find_constant_term_loc PROTO((rtx *)); | |
56 | static int insn_invalid_p PROTO((rtx)); | |
2055cea7 RK |
57 | |
58 | /* Nonzero means allow operands to be volatile. | |
59 | This should be 0 if you are generating rtl, such as if you are calling | |
60 | the functions in optabs.c and expmed.c (most of the time). | |
61 | This should be 1 if all valid insns need to be recognized, | |
62 | such as in regclass.c and final.c and reload.c. | |
63 | ||
64 | init_recog and init_recog_no_volatile are responsible for setting this. */ | |
65 | ||
66 | int volatile_ok; | |
67 | ||
0eadeb15 BS |
68 | /* The next variables are set up by extract_insn. The first four of them |
69 | are also set up during insn_extract. */ | |
0a578fee BS |
70 | |
71 | /* Indexed by N, gives value of operand N. */ | |
72 | rtx recog_operand[MAX_RECOG_OPERANDS]; | |
73 | ||
74 | /* Indexed by N, gives location where operand N was found. */ | |
75 | rtx *recog_operand_loc[MAX_RECOG_OPERANDS]; | |
76 | ||
77 | /* Indexed by N, gives location where the Nth duplicate-appearance of | |
78 | an operand was found. This is something that matched MATCH_DUP. */ | |
79 | rtx *recog_dup_loc[MAX_RECOG_OPERANDS]; | |
80 | ||
81 | /* Indexed by N, gives the operand number that was duplicated in the | |
82 | Nth duplicate-appearance of an operand. */ | |
83 | char recog_dup_num[MAX_RECOG_OPERANDS]; | |
84 | ||
0a578fee BS |
85 | /* The number of operands of the insn. */ |
86 | int recog_n_operands; | |
87 | ||
88 | /* The number of MATCH_DUPs in the insn. */ | |
89 | int recog_n_dups; | |
90 | ||
91 | /* The number of alternatives in the constraints for the insn. */ | |
92 | int recog_n_alternatives; | |
93 | ||
94 | /* Indexed by N, gives the mode of operand N. */ | |
95 | enum machine_mode recog_operand_mode[MAX_RECOG_OPERANDS]; | |
96 | ||
97 | /* Indexed by N, gives the constraint string for operand N. */ | |
9b3142b3 | 98 | const char *recog_constraints[MAX_RECOG_OPERANDS]; |
0a578fee | 99 | |
0eadeb15 BS |
100 | /* Indexed by N, gives the type (in, out, inout) for operand N. */ |
101 | enum op_type recog_op_type[MAX_RECOG_OPERANDS]; | |
102 | ||
0a578fee BS |
103 | #ifndef REGISTER_CONSTRAINTS |
104 | /* Indexed by N, nonzero if operand N should be an address. */ | |
105 | char recog_operand_address_p[MAX_RECOG_OPERANDS]; | |
106 | #endif | |
107 | ||
f62a15e3 BS |
108 | /* Contains a vector of operand_alternative structures for every operand. |
109 | Set up by preprocess_constraints. */ | |
110 | struct operand_alternative recog_op_alt[MAX_RECOG_OPERANDS][MAX_RECOG_ALTERNATIVES]; | |
111 | ||
2055cea7 RK |
112 | /* On return from `constrain_operands', indicate which alternative |
113 | was satisfied. */ | |
114 | ||
115 | int which_alternative; | |
116 | ||
117 | /* Nonzero after end of reload pass. | |
118 | Set to 1 or 0 by toplev.c. | |
119 | Controls the significance of (SUBREG (MEM)). */ | |
120 | ||
121 | int reload_completed; | |
122 | ||
123 | /* Initialize data used by the function `recog'. | |
124 | This must be called once in the compilation of a function | |
125 | before any insn recognition may be done in the function. */ | |
126 | ||
127 | void | |
128 | init_recog_no_volatile () | |
129 | { | |
130 | volatile_ok = 0; | |
131 | } | |
132 | ||
e0069e43 | 133 | void |
2055cea7 RK |
134 | init_recog () |
135 | { | |
136 | volatile_ok = 1; | |
137 | } | |
138 | ||
139 | /* Try recognizing the instruction INSN, | |
140 | and return the code number that results. | |
9faa82d8 | 141 | Remember the code so that repeated calls do not |
2055cea7 RK |
142 | need to spend the time for actual rerecognition. |
143 | ||
144 | This function is the normal interface to instruction recognition. | |
145 | The automatically-generated function `recog' is normally called | |
146 | through this one. (The only exception is in combine.c.) */ | |
147 | ||
148 | int | |
149 | recog_memoized (insn) | |
150 | rtx insn; | |
151 | { | |
152 | if (INSN_CODE (insn) < 0) | |
9e4223f2 | 153 | INSN_CODE (insn) = recog (PATTERN (insn), insn, NULL_PTR); |
2055cea7 RK |
154 | return INSN_CODE (insn); |
155 | } | |
156 | \f | |
157 | /* Check that X is an insn-body for an `asm' with operands | |
158 | and that the operands mentioned in it are legitimate. */ | |
159 | ||
160 | int | |
161 | check_asm_operands (x) | |
162 | rtx x; | |
163 | { | |
1f06ee8d | 164 | int noperands; |
2055cea7 | 165 | rtx *operands; |
9b3142b3 | 166 | const char **constraints; |
2055cea7 RK |
167 | int i; |
168 | ||
1f06ee8d RH |
169 | /* Post-reload, be more strict with things. */ |
170 | if (reload_completed) | |
171 | { | |
172 | /* ??? Doh! We've not got the wrapping insn. Cook one up. */ | |
173 | extract_insn (make_insn_raw (x)); | |
174 | constrain_operands (1); | |
175 | return which_alternative >= 0; | |
176 | } | |
177 | ||
178 | noperands = asm_noperands (x); | |
2055cea7 RK |
179 | if (noperands < 0) |
180 | return 0; | |
181 | if (noperands == 0) | |
182 | return 1; | |
183 | ||
184 | operands = (rtx *) alloca (noperands * sizeof (rtx)); | |
9b3142b3 | 185 | constraints = (const char **) alloca (noperands * sizeof (char *)); |
1f06ee8d RH |
186 | |
187 | decode_asm_operands (x, operands, NULL_PTR, constraints, NULL_PTR); | |
2055cea7 RK |
188 | |
189 | for (i = 0; i < noperands; i++) | |
1f06ee8d | 190 | { |
9b3142b3 | 191 | const char *c = constraints[i]; |
1afbe1c4 RH |
192 | if (c[0] == '%') |
193 | c++; | |
194 | if (ISDIGIT ((unsigned char)c[0]) && c[1] == '\0') | |
1f06ee8d RH |
195 | c = constraints[c[0] - '0']; |
196 | ||
197 | if (! asm_operand_ok (operands[i], c)) | |
198 | return 0; | |
199 | } | |
2055cea7 RK |
200 | |
201 | return 1; | |
202 | } | |
203 | \f | |
41a972a9 | 204 | /* Static data for the next two routines. */ |
2055cea7 | 205 | |
41a972a9 MM |
206 | typedef struct change_t |
207 | { | |
208 | rtx object; | |
209 | int old_code; | |
210 | rtx *loc; | |
211 | rtx old; | |
212 | } change_t; | |
2055cea7 | 213 | |
41a972a9 MM |
214 | static change_t *changes; |
215 | static int changes_allocated; | |
2055cea7 RK |
216 | |
217 | static int num_changes = 0; | |
218 | ||
219 | /* Validate a proposed change to OBJECT. LOC is the location in the rtl for | |
220 | at which NEW will be placed. If OBJECT is zero, no validation is done, | |
221 | the change is simply made. | |
222 | ||
223 | Two types of objects are supported: If OBJECT is a MEM, memory_address_p | |
224 | will be called with the address and mode as parameters. If OBJECT is | |
225 | an INSN, CALL_INSN, or JUMP_INSN, the insn will be re-recognized with | |
226 | the change in place. | |
227 | ||
228 | IN_GROUP is non-zero if this is part of a group of changes that must be | |
229 | performed as a group. In that case, the changes will be stored. The | |
230 | function `apply_change_group' will validate and apply the changes. | |
231 | ||
232 | If IN_GROUP is zero, this is a single change. Try to recognize the insn | |
233 | or validate the memory reference with the change applied. If the result | |
234 | is not valid for the machine, suppress the change and return zero. | |
235 | Otherwise, perform the change and return 1. */ | |
236 | ||
237 | int | |
238 | validate_change (object, loc, new, in_group) | |
239 | rtx object; | |
240 | rtx *loc; | |
241 | rtx new; | |
242 | int in_group; | |
243 | { | |
244 | rtx old = *loc; | |
245 | ||
246 | if (old == new || rtx_equal_p (old, new)) | |
247 | return 1; | |
248 | ||
41a972a9 | 249 | if (in_group == 0 && num_changes != 0) |
2055cea7 RK |
250 | abort (); |
251 | ||
252 | *loc = new; | |
253 | ||
254 | /* Save the information describing this change. */ | |
41a972a9 MM |
255 | if (num_changes >= changes_allocated) |
256 | { | |
257 | if (changes_allocated == 0) | |
258 | /* This value allows for repeated substitutions inside complex | |
259 | indexed addresses, or changes in up to 5 insns. */ | |
260 | changes_allocated = MAX_RECOG_OPERANDS * 5; | |
261 | else | |
262 | changes_allocated *= 2; | |
263 | ||
264 | changes = | |
265 | (change_t*) xrealloc (changes, | |
266 | sizeof (change_t) * changes_allocated); | |
267 | } | |
268 | ||
269 | changes[num_changes].object = object; | |
270 | changes[num_changes].loc = loc; | |
271 | changes[num_changes].old = old; | |
2055cea7 RK |
272 | |
273 | if (object && GET_CODE (object) != MEM) | |
274 | { | |
275 | /* Set INSN_CODE to force rerecognition of insn. Save old code in | |
276 | case invalid. */ | |
41a972a9 | 277 | changes[num_changes].old_code = INSN_CODE (object); |
2055cea7 RK |
278 | INSN_CODE (object) = -1; |
279 | } | |
280 | ||
281 | num_changes++; | |
282 | ||
283 | /* If we are making a group of changes, return 1. Otherwise, validate the | |
284 | change group we made. */ | |
285 | ||
286 | if (in_group) | |
287 | return 1; | |
288 | else | |
289 | return apply_change_group (); | |
290 | } | |
291 | ||
61719ba7 BS |
292 | /* This subroutine of apply_change_group verifies whether the changes to INSN |
293 | were valid; i.e. whether INSN can still be recognized. */ | |
294 | ||
295 | static int | |
296 | insn_invalid_p (insn) | |
297 | rtx insn; | |
298 | { | |
299 | int icode = recog_memoized (insn); | |
300 | int is_asm = icode < 0 && asm_noperands (PATTERN (insn)) >= 0; | |
301 | ||
0eadeb15 BS |
302 | if (is_asm && ! check_asm_operands (PATTERN (insn))) |
303 | return 1; | |
304 | if (! is_asm && icode < 0) | |
61719ba7 BS |
305 | return 1; |
306 | ||
307 | /* After reload, verify that all constraints are satisfied. */ | |
308 | if (reload_completed) | |
309 | { | |
0eadeb15 | 310 | extract_insn (insn); |
61719ba7 | 311 | |
0eadeb15 | 312 | if (! constrain_operands (1)) |
61719ba7 BS |
313 | return 1; |
314 | } | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
2055cea7 RK |
319 | /* Apply a group of changes previously issued with `validate_change'. |
320 | Return 1 if all changes are valid, zero otherwise. */ | |
321 | ||
322 | int | |
323 | apply_change_group () | |
324 | { | |
325 | int i; | |
326 | ||
327 | /* The changes have been applied and all INSN_CODEs have been reset to force | |
328 | rerecognition. | |
329 | ||
330 | The changes are valid if we aren't given an object, or if we are | |
331 | given a MEM and it still is a valid address, or if this is in insn | |
332 | and it is recognized. In the latter case, if reload has completed, | |
333 | we also require that the operands meet the constraints for | |
0eadeb15 | 334 | the insn. */ |
2055cea7 RK |
335 | |
336 | for (i = 0; i < num_changes; i++) | |
337 | { | |
41a972a9 | 338 | rtx object = changes[i].object; |
2055cea7 RK |
339 | |
340 | if (object == 0) | |
341 | continue; | |
342 | ||
343 | if (GET_CODE (object) == MEM) | |
344 | { | |
345 | if (! memory_address_p (GET_MODE (object), XEXP (object, 0))) | |
346 | break; | |
347 | } | |
61719ba7 | 348 | else if (insn_invalid_p (object)) |
2055cea7 RK |
349 | { |
350 | rtx pat = PATTERN (object); | |
351 | ||
352 | /* Perhaps we couldn't recognize the insn because there were | |
353 | extra CLOBBERs at the end. If so, try to re-recognize | |
354 | without the last CLOBBER (later iterations will cause each of | |
355 | them to be eliminated, in turn). But don't do this if we | |
356 | have an ASM_OPERAND. */ | |
357 | if (GET_CODE (pat) == PARALLEL | |
358 | && GET_CODE (XVECEXP (pat, 0, XVECLEN (pat, 0) - 1)) == CLOBBER | |
359 | && asm_noperands (PATTERN (object)) < 0) | |
360 | { | |
361 | rtx newpat; | |
362 | ||
363 | if (XVECLEN (pat, 0) == 2) | |
364 | newpat = XVECEXP (pat, 0, 0); | |
365 | else | |
366 | { | |
367 | int j; | |
368 | ||
38a448ca RH |
369 | newpat = gen_rtx_PARALLEL (VOIDmode, |
370 | gen_rtvec (XVECLEN (pat, 0) - 1)); | |
2055cea7 RK |
371 | for (j = 0; j < XVECLEN (newpat, 0); j++) |
372 | XVECEXP (newpat, 0, j) = XVECEXP (pat, 0, j); | |
373 | } | |
374 | ||
375 | /* Add a new change to this group to replace the pattern | |
376 | with this new pattern. Then consider this change | |
377 | as having succeeded. The change we added will | |
378 | cause the entire call to fail if things remain invalid. | |
379 | ||
380 | Note that this can lose if a later change than the one | |
381 | we are processing specified &XVECEXP (PATTERN (object), 0, X) | |
382 | but this shouldn't occur. */ | |
383 | ||
384 | validate_change (object, &PATTERN (object), newpat, 1); | |
385 | } | |
386 | else if (GET_CODE (pat) == USE || GET_CODE (pat) == CLOBBER) | |
387 | /* If this insn is a CLOBBER or USE, it is always valid, but is | |
388 | never recognized. */ | |
389 | continue; | |
390 | else | |
391 | break; | |
392 | } | |
393 | } | |
394 | ||
395 | if (i == num_changes) | |
396 | { | |
397 | num_changes = 0; | |
398 | return 1; | |
399 | } | |
400 | else | |
401 | { | |
402 | cancel_changes (0); | |
403 | return 0; | |
404 | } | |
405 | } | |
406 | ||
407 | /* Return the number of changes so far in the current group. */ | |
408 | ||
409 | int | |
410 | num_validated_changes () | |
411 | { | |
412 | return num_changes; | |
413 | } | |
414 | ||
415 | /* Retract the changes numbered NUM and up. */ | |
416 | ||
417 | void | |
418 | cancel_changes (num) | |
419 | int num; | |
420 | { | |
421 | int i; | |
422 | ||
423 | /* Back out all the changes. Do this in the opposite order in which | |
424 | they were made. */ | |
425 | for (i = num_changes - 1; i >= num; i--) | |
426 | { | |
41a972a9 MM |
427 | *changes[i].loc = changes[i].old; |
428 | if (changes[i].object && GET_CODE (changes[i].object) != MEM) | |
429 | INSN_CODE (changes[i].object) = changes[i].old_code; | |
2055cea7 RK |
430 | } |
431 | num_changes = num; | |
432 | } | |
433 | ||
434 | /* Replace every occurrence of FROM in X with TO. Mark each change with | |
435 | validate_change passing OBJECT. */ | |
436 | ||
437 | static void | |
438 | validate_replace_rtx_1 (loc, from, to, object) | |
439 | rtx *loc; | |
440 | rtx from, to, object; | |
441 | { | |
442 | register int i, j; | |
443 | register char *fmt; | |
444 | register rtx x = *loc; | |
445 | enum rtx_code code = GET_CODE (x); | |
446 | ||
447 | /* X matches FROM if it is the same rtx or they are both referring to the | |
448 | same register in the same mode. Avoid calling rtx_equal_p unless the | |
449 | operands look similar. */ | |
450 | ||
451 | if (x == from | |
452 | || (GET_CODE (x) == REG && GET_CODE (from) == REG | |
453 | && GET_MODE (x) == GET_MODE (from) | |
454 | && REGNO (x) == REGNO (from)) | |
455 | || (GET_CODE (x) == GET_CODE (from) && GET_MODE (x) == GET_MODE (from) | |
456 | && rtx_equal_p (x, from))) | |
457 | { | |
458 | validate_change (object, loc, to, 1); | |
459 | return; | |
460 | } | |
461 | ||
462 | /* For commutative or comparison operations, try replacing each argument | |
463 | separately and seeing if we made any changes. If so, put a constant | |
464 | argument last.*/ | |
465 | if (GET_RTX_CLASS (code) == '<' || GET_RTX_CLASS (code) == 'c') | |
466 | { | |
467 | int prev_changes = num_changes; | |
468 | ||
469 | validate_replace_rtx_1 (&XEXP (x, 0), from, to, object); | |
470 | validate_replace_rtx_1 (&XEXP (x, 1), from, to, object); | |
471 | if (prev_changes != num_changes && CONSTANT_P (XEXP (x, 0))) | |
472 | { | |
473 | validate_change (object, loc, | |
38a448ca RH |
474 | gen_rtx_fmt_ee (GET_RTX_CLASS (code) == 'c' ? code |
475 | : swap_condition (code), | |
476 | GET_MODE (x), XEXP (x, 1), | |
477 | XEXP (x, 0)), | |
2055cea7 RK |
478 | 1); |
479 | x = *loc; | |
480 | code = GET_CODE (x); | |
481 | } | |
482 | } | |
483 | ||
06140bdf RK |
484 | /* Note that if CODE's RTX_CLASS is "c" or "<" we will have already |
485 | done the substitution, otherwise we won't. */ | |
486 | ||
2055cea7 RK |
487 | switch (code) |
488 | { | |
489 | case PLUS: | |
38e01259 | 490 | /* If we have a PLUS whose second operand is now a CONST_INT, use |
2055cea7 RK |
491 | plus_constant to try to simplify it. */ |
492 | if (GET_CODE (XEXP (x, 1)) == CONST_INT && XEXP (x, 1) == to) | |
06140bdf RK |
493 | validate_change (object, loc, plus_constant (XEXP (x, 0), INTVAL (to)), |
494 | 1); | |
2055cea7 | 495 | return; |
06140bdf RK |
496 | |
497 | case MINUS: | |
498 | if (GET_CODE (to) == CONST_INT && XEXP (x, 1) == from) | |
499 | { | |
500 | validate_change (object, loc, | |
501 | plus_constant (XEXP (x, 0), - INTVAL (to)), | |
502 | 1); | |
503 | return; | |
504 | } | |
505 | break; | |
2055cea7 RK |
506 | |
507 | case ZERO_EXTEND: | |
508 | case SIGN_EXTEND: | |
509 | /* In these cases, the operation to be performed depends on the mode | |
510 | of the operand. If we are replacing the operand with a VOIDmode | |
511 | constant, we lose the information. So try to simplify the operation | |
512 | in that case. If it fails, substitute in something that we know | |
6dc42e49 | 513 | won't be recognized. */ |
2055cea7 RK |
514 | if (GET_MODE (to) == VOIDmode |
515 | && (XEXP (x, 0) == from | |
516 | || (GET_CODE (XEXP (x, 0)) == REG && GET_CODE (from) == REG | |
517 | && GET_MODE (XEXP (x, 0)) == GET_MODE (from) | |
518 | && REGNO (XEXP (x, 0)) == REGNO (from)))) | |
519 | { | |
520 | rtx new = simplify_unary_operation (code, GET_MODE (x), to, | |
521 | GET_MODE (from)); | |
522 | if (new == 0) | |
38a448ca | 523 | new = gen_rtx_CLOBBER (GET_MODE (x), const0_rtx); |
2055cea7 RK |
524 | |
525 | validate_change (object, loc, new, 1); | |
526 | return; | |
527 | } | |
528 | break; | |
529 | ||
530 | case SUBREG: | |
531 | /* If we have a SUBREG of a register that we are replacing and we are | |
532 | replacing it with a MEM, make a new MEM and try replacing the | |
533 | SUBREG with it. Don't do this if the MEM has a mode-dependent address | |
534 | or if we would be widening it. */ | |
535 | ||
536 | if (SUBREG_REG (x) == from | |
537 | && GET_CODE (from) == REG | |
538 | && GET_CODE (to) == MEM | |
539 | && ! mode_dependent_address_p (XEXP (to, 0)) | |
540 | && ! MEM_VOLATILE_P (to) | |
541 | && GET_MODE_SIZE (GET_MODE (x)) <= GET_MODE_SIZE (GET_MODE (to))) | |
542 | { | |
543 | int offset = SUBREG_WORD (x) * UNITS_PER_WORD; | |
544 | enum machine_mode mode = GET_MODE (x); | |
545 | rtx new; | |
546 | ||
f76b9db2 ILT |
547 | if (BYTES_BIG_ENDIAN) |
548 | offset += (MIN (UNITS_PER_WORD, | |
549 | GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) | |
550 | - MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))); | |
2055cea7 | 551 | |
38a448ca | 552 | new = gen_rtx_MEM (mode, plus_constant (XEXP (to, 0), offset)); |
2055cea7 | 553 | RTX_UNCHANGING_P (new) = RTX_UNCHANGING_P (to); |
c6df88cb | 554 | MEM_COPY_ATTRIBUTES (new, to); |
2055cea7 RK |
555 | validate_change (object, loc, new, 1); |
556 | return; | |
557 | } | |
558 | break; | |
559 | ||
560 | case ZERO_EXTRACT: | |
561 | case SIGN_EXTRACT: | |
562 | /* If we are replacing a register with memory, try to change the memory | |
563 | to be the mode required for memory in extract operations (this isn't | |
564 | likely to be an insertion operation; if it was, nothing bad will | |
565 | happen, we might just fail in some cases). */ | |
566 | ||
567 | if (XEXP (x, 0) == from && GET_CODE (from) == REG && GET_CODE (to) == MEM | |
568 | && GET_CODE (XEXP (x, 1)) == CONST_INT | |
569 | && GET_CODE (XEXP (x, 2)) == CONST_INT | |
570 | && ! mode_dependent_address_p (XEXP (to, 0)) | |
571 | && ! MEM_VOLATILE_P (to)) | |
572 | { | |
573 | enum machine_mode wanted_mode = VOIDmode; | |
574 | enum machine_mode is_mode = GET_MODE (to); | |
2055cea7 RK |
575 | int pos = INTVAL (XEXP (x, 2)); |
576 | ||
577 | #ifdef HAVE_extzv | |
578 | if (code == ZERO_EXTRACT) | |
0d8e55d8 JL |
579 | { |
580 | wanted_mode = insn_operand_mode[(int) CODE_FOR_extzv][1]; | |
581 | if (wanted_mode == VOIDmode) | |
582 | wanted_mode = word_mode; | |
583 | } | |
2055cea7 RK |
584 | #endif |
585 | #ifdef HAVE_extv | |
586 | if (code == SIGN_EXTRACT) | |
0d8e55d8 JL |
587 | { |
588 | wanted_mode = insn_operand_mode[(int) CODE_FOR_extv][1]; | |
589 | if (wanted_mode == VOIDmode) | |
590 | wanted_mode = word_mode; | |
591 | } | |
2055cea7 RK |
592 | #endif |
593 | ||
6dc42e49 | 594 | /* If we have a narrower mode, we can do something. */ |
2055cea7 RK |
595 | if (wanted_mode != VOIDmode |
596 | && GET_MODE_SIZE (wanted_mode) < GET_MODE_SIZE (is_mode)) | |
597 | { | |
598 | int offset = pos / BITS_PER_UNIT; | |
599 | rtx newmem; | |
600 | ||
601 | /* If the bytes and bits are counted differently, we | |
602 | must adjust the offset. */ | |
f76b9db2 ILT |
603 | if (BYTES_BIG_ENDIAN != BITS_BIG_ENDIAN) |
604 | offset = (GET_MODE_SIZE (is_mode) - GET_MODE_SIZE (wanted_mode) | |
605 | - offset); | |
2055cea7 RK |
606 | |
607 | pos %= GET_MODE_BITSIZE (wanted_mode); | |
608 | ||
38a448ca RH |
609 | newmem = gen_rtx_MEM (wanted_mode, |
610 | plus_constant (XEXP (to, 0), offset)); | |
2055cea7 | 611 | RTX_UNCHANGING_P (newmem) = RTX_UNCHANGING_P (to); |
c6df88cb | 612 | MEM_COPY_ATTRIBUTES (newmem, to); |
2055cea7 | 613 | |
9e4223f2 | 614 | validate_change (object, &XEXP (x, 2), GEN_INT (pos), 1); |
2055cea7 RK |
615 | validate_change (object, &XEXP (x, 0), newmem, 1); |
616 | } | |
617 | } | |
618 | ||
619 | break; | |
38a448ca RH |
620 | |
621 | default: | |
622 | break; | |
2055cea7 RK |
623 | } |
624 | ||
f745c7a2 AB |
625 | /* For commutative or comparison operations we've already performed |
626 | replacements. Don't try to perform them again. */ | |
627 | if (GET_RTX_CLASS (code) != '<' && GET_RTX_CLASS (code) != 'c') | |
2055cea7 | 628 | { |
f745c7a2 AB |
629 | fmt = GET_RTX_FORMAT (code); |
630 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
631 | { | |
632 | if (fmt[i] == 'e') | |
633 | validate_replace_rtx_1 (&XEXP (x, i), from, to, object); | |
634 | else if (fmt[i] == 'E') | |
635 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) | |
636 | validate_replace_rtx_1 (&XVECEXP (x, i, j), from, to, object); | |
637 | } | |
2055cea7 RK |
638 | } |
639 | } | |
640 | ||
641 | /* Try replacing every occurrence of FROM in INSN with TO. After all | |
642 | changes have been made, validate by seeing if INSN is still valid. */ | |
643 | ||
644 | int | |
645 | validate_replace_rtx (from, to, insn) | |
646 | rtx from, to, insn; | |
647 | { | |
648 | validate_replace_rtx_1 (&PATTERN (insn), from, to, insn); | |
649 | return apply_change_group (); | |
650 | } | |
7506f491 | 651 | |
edfac33e JL |
652 | /* Try replacing every occurrence of FROM in INSN with TO. After all |
653 | changes have been made, validate by seeing if INSN is still valid. */ | |
654 | ||
655 | void | |
656 | validate_replace_rtx_group (from, to, insn) | |
657 | rtx from, to, insn; | |
658 | { | |
659 | validate_replace_rtx_1 (&PATTERN (insn), from, to, insn); | |
660 | } | |
661 | ||
7506f491 DE |
662 | /* Try replacing every occurrence of FROM in INSN with TO, avoiding |
663 | SET_DESTs. After all changes have been made, validate by seeing if | |
664 | INSN is still valid. */ | |
665 | ||
666 | int | |
667 | validate_replace_src (from, to, insn) | |
668 | rtx from, to, insn; | |
669 | { | |
670 | if ((GET_CODE (insn) != INSN && GET_CODE (insn) != JUMP_INSN) | |
671 | || GET_CODE (PATTERN (insn)) != SET) | |
672 | abort (); | |
673 | ||
674 | validate_replace_rtx_1 (&SET_SRC (PATTERN (insn)), from, to, insn); | |
675 | if (GET_CODE (SET_DEST (PATTERN (insn))) == MEM) | |
676 | validate_replace_rtx_1 (&XEXP (SET_DEST (PATTERN (insn)), 0), | |
677 | from, to, insn); | |
678 | return apply_change_group (); | |
679 | } | |
2055cea7 RK |
680 | \f |
681 | #ifdef HAVE_cc0 | |
682 | /* Return 1 if the insn using CC0 set by INSN does not contain | |
683 | any ordered tests applied to the condition codes. | |
684 | EQ and NE tests do not count. */ | |
685 | ||
686 | int | |
687 | next_insn_tests_no_inequality (insn) | |
688 | rtx insn; | |
689 | { | |
690 | register rtx next = next_cc0_user (insn); | |
691 | ||
692 | /* If there is no next insn, we have to take the conservative choice. */ | |
693 | if (next == 0) | |
694 | return 0; | |
695 | ||
696 | return ((GET_CODE (next) == JUMP_INSN | |
697 | || GET_CODE (next) == INSN | |
698 | || GET_CODE (next) == CALL_INSN) | |
699 | && ! inequality_comparisons_p (PATTERN (next))); | |
700 | } | |
701 | ||
702 | #if 0 /* This is useless since the insn that sets the cc's | |
703 | must be followed immediately by the use of them. */ | |
704 | /* Return 1 if the CC value set up by INSN is not used. */ | |
705 | ||
706 | int | |
707 | next_insns_test_no_inequality (insn) | |
708 | rtx insn; | |
709 | { | |
710 | register rtx next = NEXT_INSN (insn); | |
711 | ||
712 | for (; next != 0; next = NEXT_INSN (next)) | |
713 | { | |
714 | if (GET_CODE (next) == CODE_LABEL | |
715 | || GET_CODE (next) == BARRIER) | |
716 | return 1; | |
717 | if (GET_CODE (next) == NOTE) | |
718 | continue; | |
719 | if (inequality_comparisons_p (PATTERN (next))) | |
720 | return 0; | |
721 | if (sets_cc0_p (PATTERN (next)) == 1) | |
722 | return 1; | |
723 | if (! reg_mentioned_p (cc0_rtx, PATTERN (next))) | |
724 | return 1; | |
725 | } | |
726 | return 1; | |
727 | } | |
728 | #endif | |
729 | #endif | |
730 | \f | |
731 | /* This is used by find_single_use to locate an rtx that contains exactly one | |
732 | use of DEST, which is typically either a REG or CC0. It returns a | |
733 | pointer to the innermost rtx expression containing DEST. Appearances of | |
734 | DEST that are being used to totally replace it are not counted. */ | |
735 | ||
736 | static rtx * | |
737 | find_single_use_1 (dest, loc) | |
738 | rtx dest; | |
739 | rtx *loc; | |
740 | { | |
741 | rtx x = *loc; | |
742 | enum rtx_code code = GET_CODE (x); | |
743 | rtx *result = 0; | |
744 | rtx *this_result; | |
745 | int i; | |
746 | char *fmt; | |
747 | ||
748 | switch (code) | |
749 | { | |
750 | case CONST_INT: | |
751 | case CONST: | |
752 | case LABEL_REF: | |
753 | case SYMBOL_REF: | |
754 | case CONST_DOUBLE: | |
755 | case CLOBBER: | |
756 | return 0; | |
757 | ||
758 | case SET: | |
759 | /* If the destination is anything other than CC0, PC, a REG or a SUBREG | |
760 | of a REG that occupies all of the REG, the insn uses DEST if | |
761 | it is mentioned in the destination or the source. Otherwise, we | |
762 | need just check the source. */ | |
763 | if (GET_CODE (SET_DEST (x)) != CC0 | |
764 | && GET_CODE (SET_DEST (x)) != PC | |
765 | && GET_CODE (SET_DEST (x)) != REG | |
766 | && ! (GET_CODE (SET_DEST (x)) == SUBREG | |
767 | && GET_CODE (SUBREG_REG (SET_DEST (x))) == REG | |
768 | && (((GET_MODE_SIZE (GET_MODE (SUBREG_REG (SET_DEST (x)))) | |
769 | + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD) | |
770 | == ((GET_MODE_SIZE (GET_MODE (SET_DEST (x))) | |
771 | + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD)))) | |
772 | break; | |
773 | ||
774 | return find_single_use_1 (dest, &SET_SRC (x)); | |
775 | ||
776 | case MEM: | |
777 | case SUBREG: | |
778 | return find_single_use_1 (dest, &XEXP (x, 0)); | |
38a448ca RH |
779 | |
780 | default: | |
781 | break; | |
2055cea7 RK |
782 | } |
783 | ||
784 | /* If it wasn't one of the common cases above, check each expression and | |
785 | vector of this code. Look for a unique usage of DEST. */ | |
786 | ||
787 | fmt = GET_RTX_FORMAT (code); | |
788 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
789 | { | |
790 | if (fmt[i] == 'e') | |
791 | { | |
792 | if (dest == XEXP (x, i) | |
793 | || (GET_CODE (dest) == REG && GET_CODE (XEXP (x, i)) == REG | |
794 | && REGNO (dest) == REGNO (XEXP (x, i)))) | |
795 | this_result = loc; | |
796 | else | |
797 | this_result = find_single_use_1 (dest, &XEXP (x, i)); | |
798 | ||
799 | if (result == 0) | |
800 | result = this_result; | |
801 | else if (this_result) | |
802 | /* Duplicate usage. */ | |
803 | return 0; | |
804 | } | |
805 | else if (fmt[i] == 'E') | |
806 | { | |
807 | int j; | |
808 | ||
809 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) | |
810 | { | |
811 | if (XVECEXP (x, i, j) == dest | |
812 | || (GET_CODE (dest) == REG | |
813 | && GET_CODE (XVECEXP (x, i, j)) == REG | |
814 | && REGNO (XVECEXP (x, i, j)) == REGNO (dest))) | |
815 | this_result = loc; | |
816 | else | |
817 | this_result = find_single_use_1 (dest, &XVECEXP (x, i, j)); | |
818 | ||
819 | if (result == 0) | |
820 | result = this_result; | |
821 | else if (this_result) | |
822 | return 0; | |
823 | } | |
824 | } | |
825 | } | |
826 | ||
827 | return result; | |
828 | } | |
829 | \f | |
830 | /* See if DEST, produced in INSN, is used only a single time in the | |
831 | sequel. If so, return a pointer to the innermost rtx expression in which | |
832 | it is used. | |
833 | ||
834 | If PLOC is non-zero, *PLOC is set to the insn containing the single use. | |
835 | ||
836 | This routine will return usually zero either before flow is called (because | |
837 | there will be no LOG_LINKS notes) or after reload (because the REG_DEAD | |
838 | note can't be trusted). | |
839 | ||
840 | If DEST is cc0_rtx, we look only at the next insn. In that case, we don't | |
841 | care about REG_DEAD notes or LOG_LINKS. | |
842 | ||
843 | Otherwise, we find the single use by finding an insn that has a | |
844 | LOG_LINKS pointing at INSN and has a REG_DEAD note for DEST. If DEST is | |
845 | only referenced once in that insn, we know that it must be the first | |
846 | and last insn referencing DEST. */ | |
847 | ||
848 | rtx * | |
849 | find_single_use (dest, insn, ploc) | |
850 | rtx dest; | |
851 | rtx insn; | |
852 | rtx *ploc; | |
853 | { | |
854 | rtx next; | |
855 | rtx *result; | |
856 | rtx link; | |
857 | ||
858 | #ifdef HAVE_cc0 | |
859 | if (dest == cc0_rtx) | |
860 | { | |
861 | next = NEXT_INSN (insn); | |
862 | if (next == 0 | |
863 | || (GET_CODE (next) != INSN && GET_CODE (next) != JUMP_INSN)) | |
864 | return 0; | |
865 | ||
866 | result = find_single_use_1 (dest, &PATTERN (next)); | |
867 | if (result && ploc) | |
868 | *ploc = next; | |
869 | return result; | |
870 | } | |
871 | #endif | |
872 | ||
873 | if (reload_completed || reload_in_progress || GET_CODE (dest) != REG) | |
874 | return 0; | |
875 | ||
876 | for (next = next_nonnote_insn (insn); | |
877 | next != 0 && GET_CODE (next) != CODE_LABEL; | |
878 | next = next_nonnote_insn (next)) | |
879 | if (GET_RTX_CLASS (GET_CODE (next)) == 'i' && dead_or_set_p (next, dest)) | |
880 | { | |
881 | for (link = LOG_LINKS (next); link; link = XEXP (link, 1)) | |
882 | if (XEXP (link, 0) == insn) | |
883 | break; | |
884 | ||
885 | if (link) | |
886 | { | |
887 | result = find_single_use_1 (dest, &PATTERN (next)); | |
888 | if (ploc) | |
889 | *ploc = next; | |
890 | return result; | |
891 | } | |
892 | } | |
893 | ||
894 | return 0; | |
895 | } | |
896 | \f | |
897 | /* Return 1 if OP is a valid general operand for machine mode MODE. | |
898 | This is either a register reference, a memory reference, | |
899 | or a constant. In the case of a memory reference, the address | |
900 | is checked for general validity for the target machine. | |
901 | ||
902 | Register and memory references must have mode MODE in order to be valid, | |
903 | but some constants have no machine mode and are valid for any mode. | |
904 | ||
905 | If MODE is VOIDmode, OP is checked for validity for whatever mode | |
906 | it has. | |
907 | ||
908 | The main use of this function is as a predicate in match_operand | |
909 | expressions in the machine description. | |
910 | ||
6dc42e49 | 911 | For an explanation of this function's behavior for registers of |
2055cea7 RK |
912 | class NO_REGS, see the comment for `register_operand'. */ |
913 | ||
914 | int | |
915 | general_operand (op, mode) | |
916 | register rtx op; | |
917 | enum machine_mode mode; | |
918 | { | |
919 | register enum rtx_code code = GET_CODE (op); | |
920 | int mode_altering_drug = 0; | |
921 | ||
922 | if (mode == VOIDmode) | |
923 | mode = GET_MODE (op); | |
924 | ||
925 | /* Don't accept CONST_INT or anything similar | |
926 | if the caller wants something floating. */ | |
927 | if (GET_MODE (op) == VOIDmode && mode != VOIDmode | |
4bb4c82e RK |
928 | && GET_MODE_CLASS (mode) != MODE_INT |
929 | && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT) | |
2055cea7 RK |
930 | return 0; |
931 | ||
932 | if (CONSTANT_P (op)) | |
933 | return ((GET_MODE (op) == VOIDmode || GET_MODE (op) == mode) | |
934 | #ifdef LEGITIMATE_PIC_OPERAND_P | |
935 | && (! flag_pic || LEGITIMATE_PIC_OPERAND_P (op)) | |
936 | #endif | |
937 | && LEGITIMATE_CONSTANT_P (op)); | |
938 | ||
939 | /* Except for certain constants with VOIDmode, already checked for, | |
940 | OP's mode must match MODE if MODE specifies a mode. */ | |
941 | ||
942 | if (GET_MODE (op) != mode) | |
943 | return 0; | |
944 | ||
945 | if (code == SUBREG) | |
946 | { | |
947 | #ifdef INSN_SCHEDULING | |
948 | /* On machines that have insn scheduling, we want all memory | |
949 | reference to be explicit, so outlaw paradoxical SUBREGs. */ | |
950 | if (GET_CODE (SUBREG_REG (op)) == MEM | |
951 | && GET_MODE_SIZE (mode) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (op)))) | |
952 | return 0; | |
953 | #endif | |
954 | ||
955 | op = SUBREG_REG (op); | |
956 | code = GET_CODE (op); | |
957 | #if 0 | |
958 | /* No longer needed, since (SUBREG (MEM...)) | |
959 | will load the MEM into a reload reg in the MEM's own mode. */ | |
960 | mode_altering_drug = 1; | |
961 | #endif | |
962 | } | |
963 | ||
964 | if (code == REG) | |
965 | /* A register whose class is NO_REGS is not a general operand. */ | |
966 | return (REGNO (op) >= FIRST_PSEUDO_REGISTER | |
967 | || REGNO_REG_CLASS (REGNO (op)) != NO_REGS); | |
968 | ||
969 | if (code == MEM) | |
970 | { | |
971 | register rtx y = XEXP (op, 0); | |
972 | if (! volatile_ok && MEM_VOLATILE_P (op)) | |
973 | return 0; | |
38a448ca RH |
974 | if (GET_CODE (y) == ADDRESSOF) |
975 | return 1; | |
2055cea7 RK |
976 | /* Use the mem's mode, since it will be reloaded thus. */ |
977 | mode = GET_MODE (op); | |
978 | GO_IF_LEGITIMATE_ADDRESS (mode, y, win); | |
979 | } | |
38a448ca RH |
980 | |
981 | /* Pretend this is an operand for now; we'll run force_operand | |
982 | on its replacement in fixup_var_refs_1. */ | |
983 | if (code == ADDRESSOF) | |
984 | return 1; | |
985 | ||
2055cea7 RK |
986 | return 0; |
987 | ||
988 | win: | |
989 | if (mode_altering_drug) | |
990 | return ! mode_dependent_address_p (XEXP (op, 0)); | |
991 | return 1; | |
992 | } | |
993 | \f | |
994 | /* Return 1 if OP is a valid memory address for a memory reference | |
995 | of mode MODE. | |
996 | ||
997 | The main use of this function is as a predicate in match_operand | |
998 | expressions in the machine description. */ | |
999 | ||
1000 | int | |
1001 | address_operand (op, mode) | |
1002 | register rtx op; | |
1003 | enum machine_mode mode; | |
1004 | { | |
1005 | return memory_address_p (mode, op); | |
1006 | } | |
1007 | ||
1008 | /* Return 1 if OP is a register reference of mode MODE. | |
1009 | If MODE is VOIDmode, accept a register in any mode. | |
1010 | ||
1011 | The main use of this function is as a predicate in match_operand | |
1012 | expressions in the machine description. | |
1013 | ||
1014 | As a special exception, registers whose class is NO_REGS are | |
1015 | not accepted by `register_operand'. The reason for this change | |
1016 | is to allow the representation of special architecture artifacts | |
1017 | (such as a condition code register) without extending the rtl | |
1018 | definitions. Since registers of class NO_REGS cannot be used | |
1019 | as registers in any case where register classes are examined, | |
1020 | it is most consistent to keep this function from accepting them. */ | |
1021 | ||
1022 | int | |
1023 | register_operand (op, mode) | |
1024 | register rtx op; | |
1025 | enum machine_mode mode; | |
1026 | { | |
1027 | if (GET_MODE (op) != mode && mode != VOIDmode) | |
1028 | return 0; | |
1029 | ||
1030 | if (GET_CODE (op) == SUBREG) | |
1031 | { | |
1032 | /* Before reload, we can allow (SUBREG (MEM...)) as a register operand | |
1033 | because it is guaranteed to be reloaded into one. | |
1034 | Just make sure the MEM is valid in itself. | |
1035 | (Ideally, (SUBREG (MEM)...) should not exist after reload, | |
1036 | but currently it does result from (SUBREG (REG)...) where the | |
1037 | reg went on the stack.) */ | |
1038 | if (! reload_completed && GET_CODE (SUBREG_REG (op)) == MEM) | |
1039 | return general_operand (op, mode); | |
cba057ed RK |
1040 | |
1041 | #ifdef CLASS_CANNOT_CHANGE_SIZE | |
1042 | if (GET_CODE (SUBREG_REG (op)) == REG | |
1043 | && REGNO (SUBREG_REG (op)) < FIRST_PSEUDO_REGISTER | |
1044 | && TEST_HARD_REG_BIT (reg_class_contents[(int) CLASS_CANNOT_CHANGE_SIZE], | |
1045 | REGNO (SUBREG_REG (op))) | |
1046 | && (GET_MODE_SIZE (mode) | |
50dc6373 RK |
1047 | != GET_MODE_SIZE (GET_MODE (SUBREG_REG (op)))) |
1048 | && GET_MODE_CLASS (GET_MODE (SUBREG_REG (op))) != MODE_COMPLEX_INT | |
1049 | && GET_MODE_CLASS (GET_MODE (SUBREG_REG (op))) != MODE_COMPLEX_FLOAT) | |
cba057ed RK |
1050 | return 0; |
1051 | #endif | |
1052 | ||
2055cea7 RK |
1053 | op = SUBREG_REG (op); |
1054 | } | |
1055 | ||
1056 | /* We don't consider registers whose class is NO_REGS | |
1057 | to be a register operand. */ | |
1058 | return (GET_CODE (op) == REG | |
1059 | && (REGNO (op) >= FIRST_PSEUDO_REGISTER | |
1060 | || REGNO_REG_CLASS (REGNO (op)) != NO_REGS)); | |
1061 | } | |
1062 | ||
1063 | /* Return 1 if OP should match a MATCH_SCRATCH, i.e., if it is a SCRATCH | |
1064 | or a hard register. */ | |
1065 | ||
1066 | int | |
1067 | scratch_operand (op, mode) | |
1068 | register rtx op; | |
1069 | enum machine_mode mode; | |
1070 | { | |
1071 | return (GET_MODE (op) == mode | |
1072 | && (GET_CODE (op) == SCRATCH | |
1073 | || (GET_CODE (op) == REG | |
1074 | && REGNO (op) < FIRST_PSEUDO_REGISTER))); | |
1075 | } | |
1076 | ||
1077 | /* Return 1 if OP is a valid immediate operand for mode MODE. | |
1078 | ||
1079 | The main use of this function is as a predicate in match_operand | |
1080 | expressions in the machine description. */ | |
1081 | ||
1082 | int | |
1083 | immediate_operand (op, mode) | |
1084 | register rtx op; | |
1085 | enum machine_mode mode; | |
1086 | { | |
1087 | /* Don't accept CONST_INT or anything similar | |
1088 | if the caller wants something floating. */ | |
1089 | if (GET_MODE (op) == VOIDmode && mode != VOIDmode | |
4bb4c82e RK |
1090 | && GET_MODE_CLASS (mode) != MODE_INT |
1091 | && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT) | |
2055cea7 RK |
1092 | return 0; |
1093 | ||
ee5332b8 RH |
1094 | /* Accept CONSTANT_P_RTX, since it will be gone by CSE1 and |
1095 | result in 0/1. It seems a safe assumption that this is | |
1096 | in range for everyone. */ | |
1097 | if (GET_CODE (op) == CONSTANT_P_RTX) | |
1098 | return 1; | |
1099 | ||
2055cea7 RK |
1100 | return (CONSTANT_P (op) |
1101 | && (GET_MODE (op) == mode || mode == VOIDmode | |
1102 | || GET_MODE (op) == VOIDmode) | |
1103 | #ifdef LEGITIMATE_PIC_OPERAND_P | |
1104 | && (! flag_pic || LEGITIMATE_PIC_OPERAND_P (op)) | |
1105 | #endif | |
1106 | && LEGITIMATE_CONSTANT_P (op)); | |
1107 | } | |
1108 | ||
1109 | /* Returns 1 if OP is an operand that is a CONST_INT. */ | |
1110 | ||
1111 | int | |
1112 | const_int_operand (op, mode) | |
1113 | register rtx op; | |
e51712db | 1114 | enum machine_mode mode ATTRIBUTE_UNUSED; |
2055cea7 RK |
1115 | { |
1116 | return GET_CODE (op) == CONST_INT; | |
1117 | } | |
1118 | ||
1119 | /* Returns 1 if OP is an operand that is a constant integer or constant | |
1120 | floating-point number. */ | |
1121 | ||
1122 | int | |
1123 | const_double_operand (op, mode) | |
1124 | register rtx op; | |
1125 | enum machine_mode mode; | |
1126 | { | |
1127 | /* Don't accept CONST_INT or anything similar | |
1128 | if the caller wants something floating. */ | |
1129 | if (GET_MODE (op) == VOIDmode && mode != VOIDmode | |
4bb4c82e RK |
1130 | && GET_MODE_CLASS (mode) != MODE_INT |
1131 | && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT) | |
2055cea7 RK |
1132 | return 0; |
1133 | ||
1134 | return ((GET_CODE (op) == CONST_DOUBLE || GET_CODE (op) == CONST_INT) | |
1135 | && (mode == VOIDmode || GET_MODE (op) == mode | |
1136 | || GET_MODE (op) == VOIDmode)); | |
1137 | } | |
1138 | ||
1139 | /* Return 1 if OP is a general operand that is not an immediate operand. */ | |
1140 | ||
1141 | int | |
1142 | nonimmediate_operand (op, mode) | |
1143 | register rtx op; | |
1144 | enum machine_mode mode; | |
1145 | { | |
1146 | return (general_operand (op, mode) && ! CONSTANT_P (op)); | |
1147 | } | |
1148 | ||
1149 | /* Return 1 if OP is a register reference or immediate value of mode MODE. */ | |
1150 | ||
1151 | int | |
1152 | nonmemory_operand (op, mode) | |
1153 | register rtx op; | |
1154 | enum machine_mode mode; | |
1155 | { | |
1156 | if (CONSTANT_P (op)) | |
1157 | { | |
1158 | /* Don't accept CONST_INT or anything similar | |
1159 | if the caller wants something floating. */ | |
1160 | if (GET_MODE (op) == VOIDmode && mode != VOIDmode | |
4bb4c82e RK |
1161 | && GET_MODE_CLASS (mode) != MODE_INT |
1162 | && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT) | |
2055cea7 RK |
1163 | return 0; |
1164 | ||
1165 | return ((GET_MODE (op) == VOIDmode || GET_MODE (op) == mode) | |
1166 | #ifdef LEGITIMATE_PIC_OPERAND_P | |
1167 | && (! flag_pic || LEGITIMATE_PIC_OPERAND_P (op)) | |
1168 | #endif | |
1169 | && LEGITIMATE_CONSTANT_P (op)); | |
1170 | } | |
1171 | ||
1172 | if (GET_MODE (op) != mode && mode != VOIDmode) | |
1173 | return 0; | |
1174 | ||
1175 | if (GET_CODE (op) == SUBREG) | |
1176 | { | |
1177 | /* Before reload, we can allow (SUBREG (MEM...)) as a register operand | |
1178 | because it is guaranteed to be reloaded into one. | |
1179 | Just make sure the MEM is valid in itself. | |
1180 | (Ideally, (SUBREG (MEM)...) should not exist after reload, | |
1181 | but currently it does result from (SUBREG (REG)...) where the | |
1182 | reg went on the stack.) */ | |
1183 | if (! reload_completed && GET_CODE (SUBREG_REG (op)) == MEM) | |
1184 | return general_operand (op, mode); | |
1185 | op = SUBREG_REG (op); | |
1186 | } | |
1187 | ||
1188 | /* We don't consider registers whose class is NO_REGS | |
1189 | to be a register operand. */ | |
1190 | return (GET_CODE (op) == REG | |
1191 | && (REGNO (op) >= FIRST_PSEUDO_REGISTER | |
1192 | || REGNO_REG_CLASS (REGNO (op)) != NO_REGS)); | |
1193 | } | |
1194 | ||
1195 | /* Return 1 if OP is a valid operand that stands for pushing a | |
1196 | value of mode MODE onto the stack. | |
1197 | ||
1198 | The main use of this function is as a predicate in match_operand | |
1199 | expressions in the machine description. */ | |
1200 | ||
1201 | int | |
1202 | push_operand (op, mode) | |
1203 | rtx op; | |
1204 | enum machine_mode mode; | |
1205 | { | |
1206 | if (GET_CODE (op) != MEM) | |
1207 | return 0; | |
1208 | ||
1209 | if (GET_MODE (op) != mode) | |
1210 | return 0; | |
1211 | ||
1212 | op = XEXP (op, 0); | |
1213 | ||
1214 | if (GET_CODE (op) != STACK_PUSH_CODE) | |
1215 | return 0; | |
1216 | ||
1217 | return XEXP (op, 0) == stack_pointer_rtx; | |
1218 | } | |
1219 | ||
6fbe9bd8 RH |
1220 | /* Return 1 if OP is a valid operand that stands for popping a |
1221 | value of mode MODE off the stack. | |
1222 | ||
1223 | The main use of this function is as a predicate in match_operand | |
1224 | expressions in the machine description. */ | |
1225 | ||
1226 | int | |
1227 | pop_operand (op, mode) | |
1228 | rtx op; | |
1229 | enum machine_mode mode; | |
1230 | { | |
1231 | if (GET_CODE (op) != MEM) | |
1232 | return 0; | |
1233 | ||
1234 | if (GET_MODE (op) != mode) | |
1235 | return 0; | |
1236 | ||
1237 | op = XEXP (op, 0); | |
1238 | ||
1239 | if (GET_CODE (op) != STACK_POP_CODE) | |
1240 | return 0; | |
1241 | ||
1242 | return XEXP (op, 0) == stack_pointer_rtx; | |
1243 | } | |
1244 | ||
2055cea7 RK |
1245 | /* Return 1 if ADDR is a valid memory address for mode MODE. */ |
1246 | ||
1247 | int | |
1248 | memory_address_p (mode, addr) | |
1249 | enum machine_mode mode; | |
1250 | register rtx addr; | |
1251 | { | |
38a448ca RH |
1252 | if (GET_CODE (addr) == ADDRESSOF) |
1253 | return 1; | |
1254 | ||
2055cea7 RK |
1255 | GO_IF_LEGITIMATE_ADDRESS (mode, addr, win); |
1256 | return 0; | |
1257 | ||
1258 | win: | |
1259 | return 1; | |
1260 | } | |
1261 | ||
1262 | /* Return 1 if OP is a valid memory reference with mode MODE, | |
1263 | including a valid address. | |
1264 | ||
1265 | The main use of this function is as a predicate in match_operand | |
1266 | expressions in the machine description. */ | |
1267 | ||
1268 | int | |
1269 | memory_operand (op, mode) | |
1270 | register rtx op; | |
1271 | enum machine_mode mode; | |
1272 | { | |
1273 | rtx inner; | |
1274 | ||
1275 | if (! reload_completed) | |
1276 | /* Note that no SUBREG is a memory operand before end of reload pass, | |
1277 | because (SUBREG (MEM...)) forces reloading into a register. */ | |
1278 | return GET_CODE (op) == MEM && general_operand (op, mode); | |
1279 | ||
1280 | if (mode != VOIDmode && GET_MODE (op) != mode) | |
1281 | return 0; | |
1282 | ||
1283 | inner = op; | |
1284 | if (GET_CODE (inner) == SUBREG) | |
1285 | inner = SUBREG_REG (inner); | |
1286 | ||
1287 | return (GET_CODE (inner) == MEM && general_operand (op, mode)); | |
1288 | } | |
1289 | ||
1290 | /* Return 1 if OP is a valid indirect memory reference with mode MODE; | |
1291 | that is, a memory reference whose address is a general_operand. */ | |
1292 | ||
1293 | int | |
1294 | indirect_operand (op, mode) | |
1295 | register rtx op; | |
1296 | enum machine_mode mode; | |
1297 | { | |
1298 | /* Before reload, a SUBREG isn't in memory (see memory_operand, above). */ | |
1299 | if (! reload_completed | |
1300 | && GET_CODE (op) == SUBREG && GET_CODE (SUBREG_REG (op)) == MEM) | |
1301 | { | |
1302 | register int offset = SUBREG_WORD (op) * UNITS_PER_WORD; | |
1303 | rtx inner = SUBREG_REG (op); | |
1304 | ||
f76b9db2 ILT |
1305 | if (BYTES_BIG_ENDIAN) |
1306 | offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (op))) | |
1307 | - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (inner)))); | |
2055cea7 | 1308 | |
b0e0a0f9 RK |
1309 | if (mode != VOIDmode && GET_MODE (op) != mode) |
1310 | return 0; | |
1311 | ||
2055cea7 RK |
1312 | /* The only way that we can have a general_operand as the resulting |
1313 | address is if OFFSET is zero and the address already is an operand | |
1314 | or if the address is (plus Y (const_int -OFFSET)) and Y is an | |
1315 | operand. */ | |
1316 | ||
1317 | return ((offset == 0 && general_operand (XEXP (inner, 0), Pmode)) | |
1318 | || (GET_CODE (XEXP (inner, 0)) == PLUS | |
1319 | && GET_CODE (XEXP (XEXP (inner, 0), 1)) == CONST_INT | |
1320 | && INTVAL (XEXP (XEXP (inner, 0), 1)) == -offset | |
1321 | && general_operand (XEXP (XEXP (inner, 0), 0), Pmode))); | |
1322 | } | |
1323 | ||
1324 | return (GET_CODE (op) == MEM | |
1325 | && memory_operand (op, mode) | |
1326 | && general_operand (XEXP (op, 0), Pmode)); | |
1327 | } | |
1328 | ||
1329 | /* Return 1 if this is a comparison operator. This allows the use of | |
1330 | MATCH_OPERATOR to recognize all the branch insns. */ | |
1331 | ||
1332 | int | |
1333 | comparison_operator (op, mode) | |
1334 | register rtx op; | |
1335 | enum machine_mode mode; | |
1336 | { | |
1337 | return ((mode == VOIDmode || GET_MODE (op) == mode) | |
1338 | && GET_RTX_CLASS (GET_CODE (op)) == '<'); | |
1339 | } | |
1340 | \f | |
1341 | /* If BODY is an insn body that uses ASM_OPERANDS, | |
1342 | return the number of operands (both input and output) in the insn. | |
1343 | Otherwise return -1. */ | |
1344 | ||
1345 | int | |
1346 | asm_noperands (body) | |
1347 | rtx body; | |
1348 | { | |
1349 | if (GET_CODE (body) == ASM_OPERANDS) | |
1350 | /* No output operands: return number of input operands. */ | |
1351 | return ASM_OPERANDS_INPUT_LENGTH (body); | |
1352 | if (GET_CODE (body) == SET && GET_CODE (SET_SRC (body)) == ASM_OPERANDS) | |
1353 | /* Single output operand: BODY is (set OUTPUT (asm_operands ...)). */ | |
1354 | return ASM_OPERANDS_INPUT_LENGTH (SET_SRC (body)) + 1; | |
1355 | else if (GET_CODE (body) == PARALLEL | |
1356 | && GET_CODE (XVECEXP (body, 0, 0)) == SET | |
1357 | && GET_CODE (SET_SRC (XVECEXP (body, 0, 0))) == ASM_OPERANDS) | |
1358 | { | |
1359 | /* Multiple output operands, or 1 output plus some clobbers: | |
1360 | body is [(set OUTPUT (asm_operands ...))... (clobber (reg ...))...]. */ | |
1361 | int i; | |
1362 | int n_sets; | |
1363 | ||
1364 | /* Count backwards through CLOBBERs to determine number of SETs. */ | |
1365 | for (i = XVECLEN (body, 0); i > 0; i--) | |
1366 | { | |
1367 | if (GET_CODE (XVECEXP (body, 0, i - 1)) == SET) | |
1368 | break; | |
1369 | if (GET_CODE (XVECEXP (body, 0, i - 1)) != CLOBBER) | |
1370 | return -1; | |
1371 | } | |
1372 | ||
1373 | /* N_SETS is now number of output operands. */ | |
1374 | n_sets = i; | |
1375 | ||
1376 | /* Verify that all the SETs we have | |
1377 | came from a single original asm_operands insn | |
1378 | (so that invalid combinations are blocked). */ | |
1379 | for (i = 0; i < n_sets; i++) | |
1380 | { | |
1381 | rtx elt = XVECEXP (body, 0, i); | |
1382 | if (GET_CODE (elt) != SET) | |
1383 | return -1; | |
1384 | if (GET_CODE (SET_SRC (elt)) != ASM_OPERANDS) | |
1385 | return -1; | |
1386 | /* If these ASM_OPERANDS rtx's came from different original insns | |
1387 | then they aren't allowed together. */ | |
1388 | if (ASM_OPERANDS_INPUT_VEC (SET_SRC (elt)) | |
1389 | != ASM_OPERANDS_INPUT_VEC (SET_SRC (XVECEXP (body, 0, 0)))) | |
1390 | return -1; | |
1391 | } | |
1392 | return (ASM_OPERANDS_INPUT_LENGTH (SET_SRC (XVECEXP (body, 0, 0))) | |
1393 | + n_sets); | |
1394 | } | |
1395 | else if (GET_CODE (body) == PARALLEL | |
1396 | && GET_CODE (XVECEXP (body, 0, 0)) == ASM_OPERANDS) | |
1397 | { | |
1398 | /* 0 outputs, but some clobbers: | |
1399 | body is [(asm_operands ...) (clobber (reg ...))...]. */ | |
1400 | int i; | |
1401 | ||
1402 | /* Make sure all the other parallel things really are clobbers. */ | |
1403 | for (i = XVECLEN (body, 0) - 1; i > 0; i--) | |
1404 | if (GET_CODE (XVECEXP (body, 0, i)) != CLOBBER) | |
1405 | return -1; | |
1406 | ||
1407 | return ASM_OPERANDS_INPUT_LENGTH (XVECEXP (body, 0, 0)); | |
1408 | } | |
1409 | else | |
1410 | return -1; | |
1411 | } | |
1412 | ||
1413 | /* Assuming BODY is an insn body that uses ASM_OPERANDS, | |
1414 | copy its operands (both input and output) into the vector OPERANDS, | |
1415 | the locations of the operands within the insn into the vector OPERAND_LOCS, | |
1416 | and the constraints for the operands into CONSTRAINTS. | |
1417 | Write the modes of the operands into MODES. | |
1418 | Return the assembler-template. | |
1419 | ||
1420 | If MODES, OPERAND_LOCS, CONSTRAINTS or OPERANDS is 0, | |
1421 | we don't store that info. */ | |
1422 | ||
1423 | char * | |
1424 | decode_asm_operands (body, operands, operand_locs, constraints, modes) | |
1425 | rtx body; | |
1426 | rtx *operands; | |
1427 | rtx **operand_locs; | |
9b3142b3 | 1428 | const char **constraints; |
2055cea7 RK |
1429 | enum machine_mode *modes; |
1430 | { | |
1431 | register int i; | |
1432 | int noperands; | |
1433 | char *template = 0; | |
1434 | ||
1435 | if (GET_CODE (body) == SET && GET_CODE (SET_SRC (body)) == ASM_OPERANDS) | |
1436 | { | |
1437 | rtx asmop = SET_SRC (body); | |
1438 | /* Single output operand: BODY is (set OUTPUT (asm_operands ....)). */ | |
1439 | ||
1440 | noperands = ASM_OPERANDS_INPUT_LENGTH (asmop) + 1; | |
1441 | ||
1442 | for (i = 1; i < noperands; i++) | |
1443 | { | |
1444 | if (operand_locs) | |
1445 | operand_locs[i] = &ASM_OPERANDS_INPUT (asmop, i - 1); | |
1446 | if (operands) | |
1447 | operands[i] = ASM_OPERANDS_INPUT (asmop, i - 1); | |
1448 | if (constraints) | |
1449 | constraints[i] = ASM_OPERANDS_INPUT_CONSTRAINT (asmop, i - 1); | |
1450 | if (modes) | |
1451 | modes[i] = ASM_OPERANDS_INPUT_MODE (asmop, i - 1); | |
1452 | } | |
1453 | ||
1454 | /* The output is in the SET. | |
1455 | Its constraint is in the ASM_OPERANDS itself. */ | |
1456 | if (operands) | |
1457 | operands[0] = SET_DEST (body); | |
1458 | if (operand_locs) | |
1459 | operand_locs[0] = &SET_DEST (body); | |
1460 | if (constraints) | |
1461 | constraints[0] = ASM_OPERANDS_OUTPUT_CONSTRAINT (asmop); | |
1462 | if (modes) | |
1463 | modes[0] = GET_MODE (SET_DEST (body)); | |
1464 | template = ASM_OPERANDS_TEMPLATE (asmop); | |
1465 | } | |
1466 | else if (GET_CODE (body) == ASM_OPERANDS) | |
1467 | { | |
1468 | rtx asmop = body; | |
1469 | /* No output operands: BODY is (asm_operands ....). */ | |
1470 | ||
1471 | noperands = ASM_OPERANDS_INPUT_LENGTH (asmop); | |
1472 | ||
1473 | /* The input operands are found in the 1st element vector. */ | |
1474 | /* Constraints for inputs are in the 2nd element vector. */ | |
1475 | for (i = 0; i < noperands; i++) | |
1476 | { | |
1477 | if (operand_locs) | |
1478 | operand_locs[i] = &ASM_OPERANDS_INPUT (asmop, i); | |
1479 | if (operands) | |
1480 | operands[i] = ASM_OPERANDS_INPUT (asmop, i); | |
1481 | if (constraints) | |
1482 | constraints[i] = ASM_OPERANDS_INPUT_CONSTRAINT (asmop, i); | |
1483 | if (modes) | |
1484 | modes[i] = ASM_OPERANDS_INPUT_MODE (asmop, i); | |
1485 | } | |
1486 | template = ASM_OPERANDS_TEMPLATE (asmop); | |
1487 | } | |
1488 | else if (GET_CODE (body) == PARALLEL | |
1489 | && GET_CODE (XVECEXP (body, 0, 0)) == SET) | |
1490 | { | |
1491 | rtx asmop = SET_SRC (XVECEXP (body, 0, 0)); | |
1492 | int nparallel = XVECLEN (body, 0); /* Includes CLOBBERs. */ | |
1493 | int nin = ASM_OPERANDS_INPUT_LENGTH (asmop); | |
1494 | int nout = 0; /* Does not include CLOBBERs. */ | |
1495 | ||
1496 | /* At least one output, plus some CLOBBERs. */ | |
1497 | ||
1498 | /* The outputs are in the SETs. | |
1499 | Their constraints are in the ASM_OPERANDS itself. */ | |
1500 | for (i = 0; i < nparallel; i++) | |
1501 | { | |
1502 | if (GET_CODE (XVECEXP (body, 0, i)) == CLOBBER) | |
1503 | break; /* Past last SET */ | |
1504 | ||
1505 | if (operands) | |
1506 | operands[i] = SET_DEST (XVECEXP (body, 0, i)); | |
1507 | if (operand_locs) | |
1508 | operand_locs[i] = &SET_DEST (XVECEXP (body, 0, i)); | |
1509 | if (constraints) | |
1510 | constraints[i] = XSTR (SET_SRC (XVECEXP (body, 0, i)), 1); | |
1511 | if (modes) | |
1512 | modes[i] = GET_MODE (SET_DEST (XVECEXP (body, 0, i))); | |
1513 | nout++; | |
1514 | } | |
1515 | ||
1516 | for (i = 0; i < nin; i++) | |
1517 | { | |
1518 | if (operand_locs) | |
1519 | operand_locs[i + nout] = &ASM_OPERANDS_INPUT (asmop, i); | |
1520 | if (operands) | |
1521 | operands[i + nout] = ASM_OPERANDS_INPUT (asmop, i); | |
1522 | if (constraints) | |
1523 | constraints[i + nout] = ASM_OPERANDS_INPUT_CONSTRAINT (asmop, i); | |
1524 | if (modes) | |
1525 | modes[i + nout] = ASM_OPERANDS_INPUT_MODE (asmop, i); | |
1526 | } | |
1527 | ||
1528 | template = ASM_OPERANDS_TEMPLATE (asmop); | |
1529 | } | |
1530 | else if (GET_CODE (body) == PARALLEL | |
1531 | && GET_CODE (XVECEXP (body, 0, 0)) == ASM_OPERANDS) | |
1532 | { | |
1533 | /* No outputs, but some CLOBBERs. */ | |
1534 | ||
1535 | rtx asmop = XVECEXP (body, 0, 0); | |
1536 | int nin = ASM_OPERANDS_INPUT_LENGTH (asmop); | |
1537 | ||
1538 | for (i = 0; i < nin; i++) | |
1539 | { | |
1540 | if (operand_locs) | |
1541 | operand_locs[i] = &ASM_OPERANDS_INPUT (asmop, i); | |
1542 | if (operands) | |
1543 | operands[i] = ASM_OPERANDS_INPUT (asmop, i); | |
1544 | if (constraints) | |
1545 | constraints[i] = ASM_OPERANDS_INPUT_CONSTRAINT (asmop, i); | |
1546 | if (modes) | |
1547 | modes[i] = ASM_OPERANDS_INPUT_MODE (asmop, i); | |
1548 | } | |
1549 | ||
1550 | template = ASM_OPERANDS_TEMPLATE (asmop); | |
1551 | } | |
1552 | ||
1553 | return template; | |
1554 | } | |
1f06ee8d | 1555 | |
1afbe1c4 RH |
1556 | /* Check if an asm_operand matches it's constraints. |
1557 | Return > 0 if ok, = 0 if bad, < 0 if inconclusive. */ | |
1f06ee8d RH |
1558 | |
1559 | int | |
1560 | asm_operand_ok (op, constraint) | |
1561 | rtx op; | |
1562 | const char *constraint; | |
1563 | { | |
1afbe1c4 RH |
1564 | int result = 0; |
1565 | ||
1f06ee8d RH |
1566 | /* Use constrain_operands after reload. */ |
1567 | if (reload_completed) | |
1568 | abort (); | |
1569 | ||
1570 | while (*constraint) | |
1571 | { | |
1572 | switch (*constraint++) | |
1573 | { | |
1574 | case '=': | |
1575 | case '+': | |
1576 | case '*': | |
1577 | case '%': | |
1578 | case '?': | |
1579 | case '!': | |
1580 | case '#': | |
1581 | case '&': | |
1582 | case ',': | |
1583 | break; | |
1584 | ||
1585 | case '0': case '1': case '2': case '3': case '4': | |
1586 | case '5': case '6': case '7': case '8': case '9': | |
1afbe1c4 RH |
1587 | /* For best results, our caller should have given us the |
1588 | proper matching constraint, but we can't actually fail | |
1589 | the check if they didn't. Indicate that results are | |
1590 | inconclusive. */ | |
1591 | result = -1; | |
1f06ee8d RH |
1592 | break; |
1593 | ||
1594 | case 'p': | |
1595 | if (address_operand (op, VOIDmode)) | |
1596 | return 1; | |
1597 | break; | |
1598 | ||
1599 | case 'm': | |
1600 | case 'V': /* non-offsettable */ | |
1601 | if (memory_operand (op, VOIDmode)) | |
1602 | return 1; | |
1603 | break; | |
1604 | ||
1605 | case 'o': /* offsettable */ | |
1606 | if (offsettable_nonstrict_memref_p (op)) | |
1607 | return 1; | |
1608 | break; | |
1609 | ||
1610 | case '<': | |
1afbe1c4 RH |
1611 | /* ??? Before flow, auto inc/dec insns are not supposed to exist, |
1612 | excepting those that expand_call created. Further, on some | |
1613 | machines which do not have generalized auto inc/dec, an inc/dec | |
1614 | is not a memory_operand. | |
1615 | ||
1616 | Match any memory and hope things are resolved after reload. */ | |
1617 | ||
1f06ee8d | 1618 | if (GET_CODE (op) == MEM |
1afbe1c4 RH |
1619 | && (1 |
1620 | || GET_CODE (XEXP (op, 0)) == PRE_DEC | |
1f06ee8d RH |
1621 | || GET_CODE (XEXP (op, 0)) == POST_DEC)) |
1622 | return 1; | |
1623 | break; | |
1624 | ||
1625 | case '>': | |
1626 | if (GET_CODE (op) == MEM | |
1afbe1c4 RH |
1627 | && (1 |
1628 | || GET_CODE (XEXP (op, 0)) == PRE_INC | |
1f06ee8d RH |
1629 | || GET_CODE (XEXP (op, 0)) == POST_INC)) |
1630 | return 1; | |
1631 | break; | |
1632 | ||
1633 | case 'E': | |
1634 | #ifndef REAL_ARITHMETIC | |
1635 | /* Match any floating double constant, but only if | |
1636 | we can examine the bits of it reliably. */ | |
1637 | if ((HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT | |
1638 | || HOST_BITS_PER_WIDE_INT != BITS_PER_WORD) | |
1639 | && GET_MODE (op) != VOIDmode && ! flag_pretend_float) | |
1640 | break; | |
1641 | #endif | |
1642 | /* FALLTHRU */ | |
1643 | ||
1644 | case 'F': | |
1645 | if (GET_CODE (op) == CONST_DOUBLE) | |
1646 | return 1; | |
1647 | break; | |
1648 | ||
1649 | case 'G': | |
1650 | if (GET_CODE (op) == CONST_DOUBLE | |
1651 | && CONST_DOUBLE_OK_FOR_LETTER_P (op, 'G')) | |
1652 | return 1; | |
1653 | break; | |
1654 | case 'H': | |
1655 | if (GET_CODE (op) == CONST_DOUBLE | |
1656 | && CONST_DOUBLE_OK_FOR_LETTER_P (op, 'H')) | |
1657 | return 1; | |
1658 | break; | |
1659 | ||
1660 | case 's': | |
1661 | if (GET_CODE (op) == CONST_INT | |
1662 | || (GET_CODE (op) == CONST_DOUBLE | |
1663 | && GET_MODE (op) == VOIDmode)) | |
1664 | break; | |
1665 | /* FALLTHRU */ | |
1666 | ||
1667 | case 'i': | |
1668 | if (CONSTANT_P (op) | |
1669 | #ifdef LEGITIMATE_PIC_OPERAND_P | |
1670 | && (! flag_pic || LEGITIMATE_PIC_OPERAND_P (op)) | |
1671 | #endif | |
1672 | ) | |
1673 | return 1; | |
1674 | break; | |
1675 | ||
1676 | case 'n': | |
1677 | if (GET_CODE (op) == CONST_INT | |
1678 | || (GET_CODE (op) == CONST_DOUBLE | |
1679 | && GET_MODE (op) == VOIDmode)) | |
1680 | return 1; | |
1681 | break; | |
1682 | ||
1683 | case 'I': | |
1684 | if (GET_CODE (op) == CONST_INT | |
1685 | && CONST_OK_FOR_LETTER_P (INTVAL (op), 'I')) | |
1686 | return 1; | |
1687 | break; | |
1688 | case 'J': | |
1689 | if (GET_CODE (op) == CONST_INT | |
1690 | && CONST_OK_FOR_LETTER_P (INTVAL (op), 'J')) | |
1691 | return 1; | |
1692 | break; | |
1693 | case 'K': | |
1694 | if (GET_CODE (op) == CONST_INT | |
1695 | && CONST_OK_FOR_LETTER_P (INTVAL (op), 'K')) | |
1696 | return 1; | |
1697 | break; | |
1698 | case 'L': | |
1699 | if (GET_CODE (op) == CONST_INT | |
1700 | && CONST_OK_FOR_LETTER_P (INTVAL (op), 'L')) | |
1701 | return 1; | |
1702 | break; | |
1703 | case 'M': | |
1704 | if (GET_CODE (op) == CONST_INT | |
1705 | && CONST_OK_FOR_LETTER_P (INTVAL (op), 'M')) | |
1706 | return 1; | |
1707 | break; | |
1708 | case 'N': | |
1709 | if (GET_CODE (op) == CONST_INT | |
1710 | && CONST_OK_FOR_LETTER_P (INTVAL (op), 'N')) | |
1711 | return 1; | |
1712 | break; | |
1713 | case 'O': | |
1714 | if (GET_CODE (op) == CONST_INT | |
1715 | && CONST_OK_FOR_LETTER_P (INTVAL (op), 'O')) | |
1716 | return 1; | |
1717 | break; | |
1718 | case 'P': | |
1719 | if (GET_CODE (op) == CONST_INT | |
1720 | && CONST_OK_FOR_LETTER_P (INTVAL (op), 'P')) | |
1721 | return 1; | |
1722 | break; | |
1723 | ||
1724 | case 'X': | |
1725 | return 1; | |
1726 | ||
1727 | case 'g': | |
1728 | if (general_operand (op, VOIDmode)) | |
1729 | return 1; | |
1730 | break; | |
1731 | ||
1732 | #ifdef EXTRA_CONSTRAINT | |
1733 | case 'Q': | |
1734 | if (EXTRA_CONSTRAINT (op, 'Q')) | |
1735 | return 1; | |
1736 | break; | |
1737 | case 'R': | |
1738 | if (EXTRA_CONSTRAINT (op, 'R')) | |
1739 | return 1; | |
1740 | break; | |
1741 | case 'S': | |
1742 | if (EXTRA_CONSTRAINT (op, 'S')) | |
1743 | return 1; | |
1744 | break; | |
1745 | case 'T': | |
1746 | if (EXTRA_CONSTRAINT (op, 'T')) | |
1747 | return 1; | |
1748 | break; | |
1749 | case 'U': | |
1750 | if (EXTRA_CONSTRAINT (op, 'U')) | |
1751 | return 1; | |
1752 | break; | |
1753 | #endif | |
1754 | ||
1755 | case 'r': | |
1756 | default: | |
1757 | if (GET_MODE (op) == BLKmode) | |
1758 | break; | |
1759 | if (register_operand (op, VOIDmode)) | |
1760 | return 1; | |
1761 | break; | |
1762 | } | |
1763 | } | |
1764 | ||
1afbe1c4 | 1765 | return result; |
1f06ee8d | 1766 | } |
2055cea7 | 1767 | \f |
2055cea7 RK |
1768 | /* Given an rtx *P, if it is a sum containing an integer constant term, |
1769 | return the location (type rtx *) of the pointer to that constant term. | |
1770 | Otherwise, return a null pointer. */ | |
1771 | ||
1772 | static rtx * | |
1773 | find_constant_term_loc (p) | |
1774 | rtx *p; | |
1775 | { | |
1776 | register rtx *tem; | |
1777 | register enum rtx_code code = GET_CODE (*p); | |
1778 | ||
1779 | /* If *P IS such a constant term, P is its location. */ | |
1780 | ||
1781 | if (code == CONST_INT || code == SYMBOL_REF || code == LABEL_REF | |
1782 | || code == CONST) | |
1783 | return p; | |
1784 | ||
1785 | /* Otherwise, if not a sum, it has no constant term. */ | |
1786 | ||
1787 | if (GET_CODE (*p) != PLUS) | |
1788 | return 0; | |
1789 | ||
1790 | /* If one of the summands is constant, return its location. */ | |
1791 | ||
1792 | if (XEXP (*p, 0) && CONSTANT_P (XEXP (*p, 0)) | |
1793 | && XEXP (*p, 1) && CONSTANT_P (XEXP (*p, 1))) | |
1794 | return p; | |
1795 | ||
1796 | /* Otherwise, check each summand for containing a constant term. */ | |
1797 | ||
1798 | if (XEXP (*p, 0) != 0) | |
1799 | { | |
1800 | tem = find_constant_term_loc (&XEXP (*p, 0)); | |
1801 | if (tem != 0) | |
1802 | return tem; | |
1803 | } | |
1804 | ||
1805 | if (XEXP (*p, 1) != 0) | |
1806 | { | |
1807 | tem = find_constant_term_loc (&XEXP (*p, 1)); | |
1808 | if (tem != 0) | |
1809 | return tem; | |
1810 | } | |
1811 | ||
1812 | return 0; | |
1813 | } | |
1814 | \f | |
1815 | /* Return 1 if OP is a memory reference | |
1816 | whose address contains no side effects | |
1817 | and remains valid after the addition | |
1818 | of a positive integer less than the | |
1819 | size of the object being referenced. | |
1820 | ||
1821 | We assume that the original address is valid and do not check it. | |
1822 | ||
1823 | This uses strict_memory_address_p as a subroutine, so | |
1824 | don't use it before reload. */ | |
1825 | ||
1826 | int | |
1827 | offsettable_memref_p (op) | |
1828 | rtx op; | |
1829 | { | |
1830 | return ((GET_CODE (op) == MEM) | |
1831 | && offsettable_address_p (1, GET_MODE (op), XEXP (op, 0))); | |
1832 | } | |
1833 | ||
1834 | /* Similar, but don't require a strictly valid mem ref: | |
1835 | consider pseudo-regs valid as index or base regs. */ | |
1836 | ||
1837 | int | |
1838 | offsettable_nonstrict_memref_p (op) | |
1839 | rtx op; | |
1840 | { | |
1841 | return ((GET_CODE (op) == MEM) | |
1842 | && offsettable_address_p (0, GET_MODE (op), XEXP (op, 0))); | |
1843 | } | |
1844 | ||
1845 | /* Return 1 if Y is a memory address which contains no side effects | |
1846 | and would remain valid after the addition of a positive integer | |
1847 | less than the size of that mode. | |
1848 | ||
1849 | We assume that the original address is valid and do not check it. | |
1850 | We do check that it is valid for narrower modes. | |
1851 | ||
1852 | If STRICTP is nonzero, we require a strictly valid address, | |
1853 | for the sake of use in reload.c. */ | |
1854 | ||
1855 | int | |
1856 | offsettable_address_p (strictp, mode, y) | |
1857 | int strictp; | |
1858 | enum machine_mode mode; | |
1859 | register rtx y; | |
1860 | { | |
1861 | register enum rtx_code ycode = GET_CODE (y); | |
1862 | register rtx z; | |
1863 | rtx y1 = y; | |
1864 | rtx *y2; | |
1865 | int (*addressp) () = (strictp ? strict_memory_address_p : memory_address_p); | |
1866 | ||
1867 | if (CONSTANT_ADDRESS_P (y)) | |
1868 | return 1; | |
1869 | ||
1870 | /* Adjusting an offsettable address involves changing to a narrower mode. | |
1871 | Make sure that's OK. */ | |
1872 | ||
1873 | if (mode_dependent_address_p (y)) | |
1874 | return 0; | |
1875 | ||
1876 | /* If the expression contains a constant term, | |
1877 | see if it remains valid when max possible offset is added. */ | |
1878 | ||
1879 | if ((ycode == PLUS) && (y2 = find_constant_term_loc (&y1))) | |
1880 | { | |
1881 | int good; | |
1882 | ||
1883 | y1 = *y2; | |
1884 | *y2 = plus_constant (*y2, GET_MODE_SIZE (mode) - 1); | |
1885 | /* Use QImode because an odd displacement may be automatically invalid | |
1886 | for any wider mode. But it should be valid for a single byte. */ | |
1887 | good = (*addressp) (QImode, y); | |
1888 | ||
1889 | /* In any case, restore old contents of memory. */ | |
1890 | *y2 = y1; | |
1891 | return good; | |
1892 | } | |
1893 | ||
1894 | if (ycode == PRE_DEC || ycode == PRE_INC | |
1895 | || ycode == POST_DEC || ycode == POST_INC) | |
1896 | return 0; | |
1897 | ||
1898 | /* The offset added here is chosen as the maximum offset that | |
1899 | any instruction could need to add when operating on something | |
1900 | of the specified mode. We assume that if Y and Y+c are | |
1901 | valid addresses then so is Y+d for all 0<d<c. */ | |
1902 | ||
1903 | z = plus_constant_for_output (y, GET_MODE_SIZE (mode) - 1); | |
1904 | ||
1905 | /* Use QImode because an odd displacement may be automatically invalid | |
1906 | for any wider mode. But it should be valid for a single byte. */ | |
1907 | return (*addressp) (QImode, z); | |
1908 | } | |
1909 | ||
1910 | /* Return 1 if ADDR is an address-expression whose effect depends | |
1911 | on the mode of the memory reference it is used in. | |
1912 | ||
1913 | Autoincrement addressing is a typical example of mode-dependence | |
1914 | because the amount of the increment depends on the mode. */ | |
1915 | ||
1916 | int | |
1917 | mode_dependent_address_p (addr) | |
47c3ed98 | 1918 | rtx addr ATTRIBUTE_UNUSED; /* Maybe used in GO_IF_MODE_DEPENDENT_ADDRESS. */ |
2055cea7 RK |
1919 | { |
1920 | GO_IF_MODE_DEPENDENT_ADDRESS (addr, win); | |
1921 | return 0; | |
47c3ed98 KG |
1922 | /* Label `win' might (not) be used via GO_IF_MODE_DEPENDENT_ADDRESS. */ |
1923 | win: ATTRIBUTE_UNUSED_LABEL | |
2055cea7 RK |
1924 | return 1; |
1925 | } | |
1926 | ||
1927 | /* Return 1 if OP is a general operand | |
1928 | other than a memory ref with a mode dependent address. */ | |
1929 | ||
1930 | int | |
1931 | mode_independent_operand (op, mode) | |
1932 | enum machine_mode mode; | |
1933 | rtx op; | |
1934 | { | |
1935 | rtx addr; | |
1936 | ||
1937 | if (! general_operand (op, mode)) | |
1938 | return 0; | |
1939 | ||
1940 | if (GET_CODE (op) != MEM) | |
1941 | return 1; | |
1942 | ||
1943 | addr = XEXP (op, 0); | |
1944 | GO_IF_MODE_DEPENDENT_ADDRESS (addr, lose); | |
1945 | return 1; | |
47c3ed98 KG |
1946 | /* Label `lose' might (not) be used via GO_IF_MODE_DEPENDENT_ADDRESS. */ |
1947 | lose: ATTRIBUTE_UNUSED_LABEL | |
2055cea7 RK |
1948 | return 0; |
1949 | } | |
1950 | ||
1951 | /* Given an operand OP that is a valid memory reference | |
1952 | which satisfies offsettable_memref_p, | |
1953 | return a new memory reference whose address has been adjusted by OFFSET. | |
1954 | OFFSET should be positive and less than the size of the object referenced. | |
1955 | */ | |
1956 | ||
1957 | rtx | |
1958 | adj_offsettable_operand (op, offset) | |
1959 | rtx op; | |
1960 | int offset; | |
1961 | { | |
1962 | register enum rtx_code code = GET_CODE (op); | |
1963 | ||
1964 | if (code == MEM) | |
1965 | { | |
1966 | register rtx y = XEXP (op, 0); | |
1967 | register rtx new; | |
1968 | ||
1969 | if (CONSTANT_ADDRESS_P (y)) | |
1970 | { | |
38a448ca | 1971 | new = gen_rtx_MEM (GET_MODE (op), plus_constant_for_output (y, offset)); |
2055cea7 RK |
1972 | RTX_UNCHANGING_P (new) = RTX_UNCHANGING_P (op); |
1973 | return new; | |
1974 | } | |
1975 | ||
1976 | if (GET_CODE (y) == PLUS) | |
1977 | { | |
1978 | rtx z = y; | |
1979 | register rtx *const_loc; | |
1980 | ||
1981 | op = copy_rtx (op); | |
1982 | z = XEXP (op, 0); | |
1983 | const_loc = find_constant_term_loc (&z); | |
1984 | if (const_loc) | |
1985 | { | |
1986 | *const_loc = plus_constant_for_output (*const_loc, offset); | |
1987 | return op; | |
1988 | } | |
1989 | } | |
1990 | ||
38a448ca | 1991 | new = gen_rtx_MEM (GET_MODE (op), plus_constant_for_output (y, offset)); |
2055cea7 RK |
1992 | RTX_UNCHANGING_P (new) = RTX_UNCHANGING_P (op); |
1993 | return new; | |
1994 | } | |
1995 | abort (); | |
1996 | } | |
1997 | \f | |
0a578fee BS |
1998 | /* Analyze INSN and compute the variables recog_n_operands, recog_n_dups, |
1999 | recog_n_alternatives, recog_operand, recog_operand_loc, recog_constraints, | |
2000 | recog_operand_mode, recog_dup_loc and recog_dup_num. | |
2001 | If REGISTER_CONSTRAINTS is not defined, also compute | |
2002 | recog_operand_address_p. */ | |
2003 | void | |
2004 | extract_insn (insn) | |
2005 | rtx insn; | |
2006 | { | |
2007 | int i; | |
2008 | int icode; | |
2009 | int noperands; | |
2010 | rtx body = PATTERN (insn); | |
2011 | ||
2012 | recog_n_operands = 0; | |
2013 | recog_n_alternatives = 0; | |
2014 | recog_n_dups = 0; | |
2015 | ||
2016 | switch (GET_CODE (body)) | |
2017 | { | |
2018 | case USE: | |
2019 | case CLOBBER: | |
2020 | case ASM_INPUT: | |
2021 | case ADDR_VEC: | |
2022 | case ADDR_DIFF_VEC: | |
2023 | return; | |
2024 | ||
2025 | case SET: | |
2026 | case PARALLEL: | |
2027 | case ASM_OPERANDS: | |
2028 | recog_n_operands = noperands = asm_noperands (body); | |
2029 | if (noperands >= 0) | |
2030 | { | |
0a578fee BS |
2031 | /* This insn is an `asm' with operands. */ |
2032 | ||
2033 | /* expand_asm_operands makes sure there aren't too many operands. */ | |
2034 | if (noperands > MAX_RECOG_OPERANDS) | |
2035 | abort (); | |
2036 | ||
2037 | /* Now get the operand values and constraints out of the insn. */ | |
2038 | decode_asm_operands (body, recog_operand, recog_operand_loc, | |
2039 | recog_constraints, recog_operand_mode); | |
2040 | if (noperands > 0) | |
2041 | { | |
9b3142b3 | 2042 | const char *p = recog_constraints[0]; |
0a578fee BS |
2043 | recog_n_alternatives = 1; |
2044 | while (*p) | |
2045 | recog_n_alternatives += (*p++ == ','); | |
2046 | } | |
2047 | #ifndef REGISTER_CONSTRAINTS | |
2048 | bzero (recog_operand_address_p, sizeof recog_operand_address_p); | |
2049 | #endif | |
2050 | break; | |
2051 | } | |
2052 | ||
2053 | /* FALLTHROUGH */ | |
2054 | ||
2055 | default: | |
2056 | /* Ordinary insn: recognize it, get the operands via insn_extract | |
2057 | and get the constraints. */ | |
2058 | ||
2059 | icode = recog_memoized (insn); | |
2060 | if (icode < 0) | |
2061 | fatal_insn_not_found (insn); | |
2062 | ||
2063 | recog_n_operands = noperands = insn_n_operands[icode]; | |
2064 | recog_n_alternatives = insn_n_alternatives[icode]; | |
2065 | recog_n_dups = insn_n_dups[icode]; | |
2066 | ||
2067 | insn_extract (insn); | |
2068 | ||
2069 | for (i = 0; i < noperands; i++) | |
2070 | { | |
2071 | #ifdef REGISTER_CONSTRAINTS | |
2072 | recog_constraints[i] = insn_operand_constraint[icode][i]; | |
2073 | #else | |
2074 | recog_operand_address_p[i] = insn_operand_address_p[icode][i]; | |
2075 | #endif | |
2076 | recog_operand_mode[i] = insn_operand_mode[icode][i]; | |
2077 | } | |
2078 | } | |
0eadeb15 BS |
2079 | for (i = 0; i < noperands; i++) |
2080 | recog_op_type[i] = (recog_constraints[i][0] == '=' ? OP_OUT | |
2081 | : recog_constraints[i][0] == '+' ? OP_INOUT | |
2082 | : OP_IN); | |
f62a15e3 BS |
2083 | |
2084 | if (recog_n_alternatives > MAX_RECOG_ALTERNATIVES) | |
2085 | abort (); | |
0a578fee BS |
2086 | } |
2087 | ||
f62a15e3 BS |
2088 | /* After calling extract_insn, you can use this function to extract some |
2089 | information from the constraint strings into a more usable form. | |
2090 | The collected data is stored in recog_op_alt. */ | |
2091 | void | |
2092 | preprocess_constraints () | |
2093 | { | |
2094 | int i; | |
2095 | ||
2096 | for (i = 0; i < recog_n_operands; i++) | |
2097 | { | |
2098 | int j; | |
2099 | struct operand_alternative *op_alt; | |
9b3142b3 | 2100 | const char *p = recog_constraints[i]; |
f62a15e3 BS |
2101 | |
2102 | op_alt = recog_op_alt[i]; | |
2103 | ||
2104 | for (j = 0; j < recog_n_alternatives; j++) | |
2105 | { | |
2106 | op_alt[j].class = NO_REGS; | |
2107 | op_alt[j].constraint = p; | |
2108 | op_alt[j].matches = -1; | |
2109 | op_alt[j].matched = -1; | |
2110 | ||
2111 | if (*p == '\0' || *p == ',') | |
2112 | { | |
2113 | op_alt[j].anything_ok = 1; | |
2114 | continue; | |
2115 | } | |
2116 | ||
2117 | for (;;) | |
2118 | { | |
2119 | char c = *p++; | |
2120 | if (c == '#') | |
2121 | do | |
2122 | c = *p++; | |
2123 | while (c != ',' && c != '\0'); | |
2124 | if (c == ',' || c == '\0') | |
2125 | break; | |
2126 | ||
2127 | switch (c) | |
2128 | { | |
2129 | case '=': case '+': case '*': case '%': | |
2130 | case 'E': case 'F': case 'G': case 'H': | |
2131 | case 's': case 'i': case 'n': | |
2132 | case 'I': case 'J': case 'K': case 'L': | |
2133 | case 'M': case 'N': case 'O': case 'P': | |
2134 | #ifdef EXTRA_CONSTRAINT | |
2135 | case 'Q': case 'R': case 'S': case 'T': case 'U': | |
2136 | #endif | |
2137 | /* These don't say anything we care about. */ | |
2138 | break; | |
2139 | ||
2140 | case '?': | |
2141 | op_alt[j].reject += 6; | |
2142 | break; | |
2143 | case '!': | |
2144 | op_alt[j].reject += 600; | |
2145 | break; | |
2146 | case '&': | |
2147 | op_alt[j].earlyclobber = 1; | |
2148 | break; | |
2149 | ||
2150 | case '0': case '1': case '2': case '3': case '4': | |
2151 | case '5': case '6': case '7': case '8': case '9': | |
2152 | op_alt[j].matches = c - '0'; | |
2153 | op_alt[op_alt[j].matches].matched = i; | |
2154 | break; | |
2155 | ||
2156 | case 'm': | |
2157 | op_alt[j].memory_ok = 1; | |
2158 | break; | |
2159 | case '<': | |
2160 | op_alt[j].decmem_ok = 1; | |
2161 | break; | |
2162 | case '>': | |
2163 | op_alt[j].incmem_ok = 1; | |
2164 | break; | |
2165 | case 'V': | |
2166 | op_alt[j].nonoffmem_ok = 1; | |
2167 | break; | |
2168 | case 'o': | |
2169 | op_alt[j].offmem_ok = 1; | |
2170 | break; | |
2171 | case 'X': | |
2172 | op_alt[j].anything_ok = 1; | |
2173 | break; | |
2174 | ||
2175 | case 'p': | |
2176 | op_alt[j].class = reg_class_subunion[(int) op_alt[j].class][(int) BASE_REG_CLASS]; | |
2177 | break; | |
2178 | ||
2179 | case 'g': case 'r': | |
2180 | op_alt[j].class = reg_class_subunion[(int) op_alt[j].class][(int) GENERAL_REGS]; | |
2181 | break; | |
2182 | ||
2183 | default: | |
973838fd | 2184 | op_alt[j].class = reg_class_subunion[(int) op_alt[j].class][(int) REG_CLASS_FROM_LETTER ((unsigned char)c)]; |
f62a15e3 BS |
2185 | break; |
2186 | } | |
2187 | } | |
2188 | } | |
2189 | } | |
2190 | } | |
2191 | ||
2055cea7 RK |
2192 | #ifdef REGISTER_CONSTRAINTS |
2193 | ||
0eadeb15 | 2194 | /* Check the operands of an insn against the insn's operand constraints |
2055cea7 | 2195 | and return 1 if they are valid. |
0eadeb15 BS |
2196 | The information about the insn's operands, constraints, operand modes |
2197 | etc. is obtained from the global variables set up by extract_insn. | |
2055cea7 RK |
2198 | |
2199 | WHICH_ALTERNATIVE is set to a number which indicates which | |
2200 | alternative of constraints was matched: 0 for the first alternative, | |
2201 | 1 for the next, etc. | |
2202 | ||
2203 | In addition, when two operands are match | |
2204 | and it happens that the output operand is (reg) while the | |
2205 | input operand is --(reg) or ++(reg) (a pre-inc or pre-dec), | |
2206 | make the output operand look like the input. | |
2207 | This is because the output operand is the one the template will print. | |
2208 | ||
2209 | This is used in final, just before printing the assembler code and by | |
2210 | the routines that determine an insn's attribute. | |
2211 | ||
2212 | If STRICT is a positive non-zero value, it means that we have been | |
2213 | called after reload has been completed. In that case, we must | |
2214 | do all checks strictly. If it is zero, it means that we have been called | |
2215 | before reload has completed. In that case, we first try to see if we can | |
2216 | find an alternative that matches strictly. If not, we try again, this | |
2217 | time assuming that reload will fix up the insn. This provides a "best | |
2218 | guess" for the alternative and is used to compute attributes of insns prior | |
2219 | to reload. A negative value of STRICT is used for this internal call. */ | |
2220 | ||
2221 | struct funny_match | |
2222 | { | |
2223 | int this, other; | |
2224 | }; | |
2225 | ||
2226 | int | |
0eadeb15 | 2227 | constrain_operands (strict) |
2055cea7 RK |
2228 | int strict; |
2229 | { | |
9b3142b3 | 2230 | const char *constraints[MAX_RECOG_OPERANDS]; |
9e21be9d | 2231 | int matching_operands[MAX_RECOG_OPERANDS]; |
9e21be9d | 2232 | int earlyclobber[MAX_RECOG_OPERANDS]; |
2055cea7 | 2233 | register int c; |
2055cea7 RK |
2234 | |
2235 | struct funny_match funny_match[MAX_RECOG_OPERANDS]; | |
2236 | int funny_match_index; | |
2055cea7 | 2237 | |
0eadeb15 | 2238 | if (recog_n_operands == 0 || recog_n_alternatives == 0) |
2055cea7 RK |
2239 | return 1; |
2240 | ||
0eadeb15 | 2241 | for (c = 0; c < recog_n_operands; c++) |
9e21be9d | 2242 | { |
0eadeb15 | 2243 | constraints[c] = recog_constraints[c]; |
9e21be9d | 2244 | matching_operands[c] = -1; |
9e21be9d | 2245 | } |
2055cea7 RK |
2246 | |
2247 | which_alternative = 0; | |
2248 | ||
0eadeb15 | 2249 | while (which_alternative < recog_n_alternatives) |
2055cea7 RK |
2250 | { |
2251 | register int opno; | |
2252 | int lose = 0; | |
2253 | funny_match_index = 0; | |
2254 | ||
0eadeb15 | 2255 | for (opno = 0; opno < recog_n_operands; opno++) |
2055cea7 RK |
2256 | { |
2257 | register rtx op = recog_operand[opno]; | |
2258 | enum machine_mode mode = GET_MODE (op); | |
9b3142b3 | 2259 | register const char *p = constraints[opno]; |
2055cea7 RK |
2260 | int offset = 0; |
2261 | int win = 0; | |
2262 | int val; | |
2263 | ||
9e21be9d RK |
2264 | earlyclobber[opno] = 0; |
2265 | ||
b85f21c0 | 2266 | /* A unary operator may be accepted by the predicate, but it |
38a448ca | 2267 | is irrelevant for matching constraints. */ |
b85f21c0 ILT |
2268 | if (GET_RTX_CLASS (GET_CODE (op)) == '1') |
2269 | op = XEXP (op, 0); | |
2270 | ||
2055cea7 RK |
2271 | if (GET_CODE (op) == SUBREG) |
2272 | { | |
2273 | if (GET_CODE (SUBREG_REG (op)) == REG | |
2274 | && REGNO (SUBREG_REG (op)) < FIRST_PSEUDO_REGISTER) | |
2275 | offset = SUBREG_WORD (op); | |
2276 | op = SUBREG_REG (op); | |
2277 | } | |
2278 | ||
2279 | /* An empty constraint or empty alternative | |
2280 | allows anything which matched the pattern. */ | |
2281 | if (*p == 0 || *p == ',') | |
2282 | win = 1; | |
2283 | ||
2284 | while (*p && (c = *p++) != ',') | |
2285 | switch (c) | |
2286 | { | |
2055cea7 | 2287 | case '?': |
2055cea7 RK |
2288 | case '!': |
2289 | case '*': | |
2290 | case '%': | |
0eadeb15 BS |
2291 | case '=': |
2292 | case '+': | |
2055cea7 RK |
2293 | break; |
2294 | ||
4d3067db RK |
2295 | case '#': |
2296 | /* Ignore rest of this alternative as far as | |
2297 | constraint checking is concerned. */ | |
2298 | while (*p && *p != ',') | |
2299 | p++; | |
2300 | break; | |
2301 | ||
9e21be9d RK |
2302 | case '&': |
2303 | earlyclobber[opno] = 1; | |
2304 | break; | |
2305 | ||
2055cea7 RK |
2306 | case '0': |
2307 | case '1': | |
2308 | case '2': | |
2309 | case '3': | |
2310 | case '4': | |
2311 | /* This operand must be the same as a previous one. | |
2312 | This kind of constraint is used for instructions such | |
2313 | as add when they take only two operands. | |
2314 | ||
2315 | Note that the lower-numbered operand is passed first. | |
2316 | ||
2317 | If we are not testing strictly, assume that this constraint | |
2318 | will be satisfied. */ | |
2319 | if (strict < 0) | |
2320 | val = 1; | |
2321 | else | |
2322 | val = operands_match_p (recog_operand[c - '0'], | |
2323 | recog_operand[opno]); | |
2324 | ||
9e21be9d RK |
2325 | matching_operands[opno] = c - '0'; |
2326 | matching_operands[c - '0'] = opno; | |
2327 | ||
2055cea7 RK |
2328 | if (val != 0) |
2329 | win = 1; | |
2330 | /* If output is *x and input is *--x, | |
2331 | arrange later to change the output to *--x as well, | |
2332 | since the output op is the one that will be printed. */ | |
2333 | if (val == 2 && strict > 0) | |
2334 | { | |
2335 | funny_match[funny_match_index].this = opno; | |
2336 | funny_match[funny_match_index++].other = c - '0'; | |
2337 | } | |
2338 | break; | |
2339 | ||
2340 | case 'p': | |
2341 | /* p is used for address_operands. When we are called by | |
a8647766 RK |
2342 | gen_reload, no one will have checked that the address is |
2343 | strictly valid, i.e., that all pseudos requiring hard regs | |
2344 | have gotten them. */ | |
2055cea7 | 2345 | if (strict <= 0 |
0eadeb15 BS |
2346 | || (strict_memory_address_p (recog_operand_mode[opno], |
2347 | op))) | |
2055cea7 RK |
2348 | win = 1; |
2349 | break; | |
2350 | ||
2351 | /* No need to check general_operand again; | |
2352 | it was done in insn-recog.c. */ | |
2353 | case 'g': | |
2354 | /* Anything goes unless it is a REG and really has a hard reg | |
2355 | but the hard reg is not in the class GENERAL_REGS. */ | |
2356 | if (strict < 0 | |
2357 | || GENERAL_REGS == ALL_REGS | |
2358 | || GET_CODE (op) != REG | |
3c3eeea6 RK |
2359 | || (reload_in_progress |
2360 | && REGNO (op) >= FIRST_PSEUDO_REGISTER) | |
2055cea7 RK |
2361 | || reg_fits_class_p (op, GENERAL_REGS, offset, mode)) |
2362 | win = 1; | |
2363 | break; | |
2364 | ||
2365 | case 'r': | |
2366 | if (strict < 0 | |
2367 | || (strict == 0 | |
2368 | && GET_CODE (op) == REG | |
2369 | && REGNO (op) >= FIRST_PSEUDO_REGISTER) | |
2370 | || (strict == 0 && GET_CODE (op) == SCRATCH) | |
2371 | || (GET_CODE (op) == REG | |
5a19ad3f RK |
2372 | && ((GENERAL_REGS == ALL_REGS |
2373 | && REGNO (op) < FIRST_PSEUDO_REGISTER) | |
2055cea7 RK |
2374 | || reg_fits_class_p (op, GENERAL_REGS, |
2375 | offset, mode)))) | |
2376 | win = 1; | |
2377 | break; | |
2378 | ||
2379 | case 'X': | |
0f41302f MS |
2380 | /* This is used for a MATCH_SCRATCH in the cases when |
2381 | we don't actually need anything. So anything goes | |
2382 | any time. */ | |
2055cea7 RK |
2383 | win = 1; |
2384 | break; | |
2385 | ||
2386 | case 'm': | |
2387 | if (GET_CODE (op) == MEM | |
2388 | /* Before reload, accept what reload can turn into mem. */ | |
3c3eeea6 RK |
2389 | || (strict < 0 && CONSTANT_P (op)) |
2390 | /* During reload, accept a pseudo */ | |
2391 | || (reload_in_progress && GET_CODE (op) == REG | |
2392 | && REGNO (op) >= FIRST_PSEUDO_REGISTER)) | |
2055cea7 RK |
2393 | win = 1; |
2394 | break; | |
2395 | ||
2396 | case '<': | |
2397 | if (GET_CODE (op) == MEM | |
2398 | && (GET_CODE (XEXP (op, 0)) == PRE_DEC | |
2399 | || GET_CODE (XEXP (op, 0)) == POST_DEC)) | |
2400 | win = 1; | |
2401 | break; | |
2402 | ||
2403 | case '>': | |
2404 | if (GET_CODE (op) == MEM | |
2405 | && (GET_CODE (XEXP (op, 0)) == PRE_INC | |
2406 | || GET_CODE (XEXP (op, 0)) == POST_INC)) | |
2407 | win = 1; | |
2408 | break; | |
2409 | ||
2410 | case 'E': | |
b990f635 | 2411 | #ifndef REAL_ARITHMETIC |
2055cea7 RK |
2412 | /* Match any CONST_DOUBLE, but only if |
2413 | we can examine the bits of it reliably. */ | |
2414 | if ((HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT | |
9e4223f2 | 2415 | || HOST_BITS_PER_WIDE_INT != BITS_PER_WORD) |
d1b765a5 | 2416 | && GET_MODE (op) != VOIDmode && ! flag_pretend_float) |
2055cea7 | 2417 | break; |
b990f635 | 2418 | #endif |
2055cea7 RK |
2419 | if (GET_CODE (op) == CONST_DOUBLE) |
2420 | win = 1; | |
2421 | break; | |
2422 | ||
2423 | case 'F': | |
2424 | if (GET_CODE (op) == CONST_DOUBLE) | |
2425 | win = 1; | |
2426 | break; | |
2427 | ||
2428 | case 'G': | |
2429 | case 'H': | |
2430 | if (GET_CODE (op) == CONST_DOUBLE | |
2431 | && CONST_DOUBLE_OK_FOR_LETTER_P (op, c)) | |
2432 | win = 1; | |
2433 | break; | |
2434 | ||
2435 | case 's': | |
2436 | if (GET_CODE (op) == CONST_INT | |
2437 | || (GET_CODE (op) == CONST_DOUBLE | |
2438 | && GET_MODE (op) == VOIDmode)) | |
2439 | break; | |
2440 | case 'i': | |
2441 | if (CONSTANT_P (op)) | |
2442 | win = 1; | |
2443 | break; | |
2444 | ||
2445 | case 'n': | |
2446 | if (GET_CODE (op) == CONST_INT | |
2447 | || (GET_CODE (op) == CONST_DOUBLE | |
2448 | && GET_MODE (op) == VOIDmode)) | |
2449 | win = 1; | |
2450 | break; | |
2451 | ||
2452 | case 'I': | |
2453 | case 'J': | |
2454 | case 'K': | |
2455 | case 'L': | |
2456 | case 'M': | |
2457 | case 'N': | |
2458 | case 'O': | |
2459 | case 'P': | |
2460 | if (GET_CODE (op) == CONST_INT | |
2461 | && CONST_OK_FOR_LETTER_P (INTVAL (op), c)) | |
2462 | win = 1; | |
2463 | break; | |
2464 | ||
2465 | #ifdef EXTRA_CONSTRAINT | |
2466 | case 'Q': | |
2467 | case 'R': | |
2468 | case 'S': | |
2469 | case 'T': | |
2470 | case 'U': | |
2471 | if (EXTRA_CONSTRAINT (op, c)) | |
2472 | win = 1; | |
2473 | break; | |
2474 | #endif | |
2475 | ||
2476 | case 'V': | |
2477 | if (GET_CODE (op) == MEM | |
69f724c0 JL |
2478 | && ((strict > 0 && ! offsettable_memref_p (op)) |
2479 | || (strict < 0 | |
2480 | && !(CONSTANT_P (op) || GET_CODE (op) == MEM)) | |
2481 | || (reload_in_progress | |
2482 | && !(GET_CODE (op) == REG | |
2483 | && REGNO (op) >= FIRST_PSEUDO_REGISTER)))) | |
2055cea7 RK |
2484 | win = 1; |
2485 | break; | |
2486 | ||
2487 | case 'o': | |
2488 | if ((strict > 0 && offsettable_memref_p (op)) | |
2489 | || (strict == 0 && offsettable_nonstrict_memref_p (op)) | |
2490 | /* Before reload, accept what reload can handle. */ | |
2491 | || (strict < 0 | |
3c3eeea6 RK |
2492 | && (CONSTANT_P (op) || GET_CODE (op) == MEM)) |
2493 | /* During reload, accept a pseudo */ | |
2494 | || (reload_in_progress && GET_CODE (op) == REG | |
2495 | && REGNO (op) >= FIRST_PSEUDO_REGISTER)) | |
2055cea7 RK |
2496 | win = 1; |
2497 | break; | |
2498 | ||
2499 | default: | |
2500 | if (strict < 0 | |
2501 | || (strict == 0 | |
2502 | && GET_CODE (op) == REG | |
2503 | && REGNO (op) >= FIRST_PSEUDO_REGISTER) | |
2504 | || (strict == 0 && GET_CODE (op) == SCRATCH) | |
2505 | || (GET_CODE (op) == REG | |
2506 | && reg_fits_class_p (op, REG_CLASS_FROM_LETTER (c), | |
2507 | offset, mode))) | |
2508 | win = 1; | |
2509 | } | |
2510 | ||
2511 | constraints[opno] = p; | |
2512 | /* If this operand did not win somehow, | |
2513 | this alternative loses. */ | |
2514 | if (! win) | |
2515 | lose = 1; | |
2516 | } | |
2517 | /* This alternative won; the operands are ok. | |
2518 | Change whichever operands this alternative says to change. */ | |
2519 | if (! lose) | |
2520 | { | |
9e21be9d RK |
2521 | int opno, eopno; |
2522 | ||
2523 | /* See if any earlyclobber operand conflicts with some other | |
2524 | operand. */ | |
2525 | ||
2526 | if (strict > 0) | |
0eadeb15 | 2527 | for (eopno = 0; eopno < recog_n_operands; eopno++) |
62946075 RS |
2528 | /* Ignore earlyclobber operands now in memory, |
2529 | because we would often report failure when we have | |
2530 | two memory operands, one of which was formerly a REG. */ | |
2531 | if (earlyclobber[eopno] | |
2532 | && GET_CODE (recog_operand[eopno]) == REG) | |
0eadeb15 | 2533 | for (opno = 0; opno < recog_n_operands; opno++) |
9e21be9d | 2534 | if ((GET_CODE (recog_operand[opno]) == MEM |
0eadeb15 | 2535 | || recog_op_type[opno] != OP_OUT) |
9e21be9d | 2536 | && opno != eopno |
0f41302f | 2537 | /* Ignore things like match_operator operands. */ |
0eadeb15 | 2538 | && *recog_constraints[opno] != 0 |
9e21be9d | 2539 | && ! (matching_operands[opno] == eopno |
011063bd JW |
2540 | && operands_match_p (recog_operand[opno], |
2541 | recog_operand[eopno])) | |
9e21be9d RK |
2542 | && ! safe_from_earlyclobber (recog_operand[opno], |
2543 | recog_operand[eopno])) | |
2544 | lose = 1; | |
2545 | ||
2546 | if (! lose) | |
2055cea7 | 2547 | { |
9e21be9d RK |
2548 | while (--funny_match_index >= 0) |
2549 | { | |
2550 | recog_operand[funny_match[funny_match_index].other] | |
2551 | = recog_operand[funny_match[funny_match_index].this]; | |
2552 | } | |
2553 | ||
2554 | return 1; | |
2055cea7 | 2555 | } |
2055cea7 RK |
2556 | } |
2557 | ||
2558 | which_alternative++; | |
2559 | } | |
2560 | ||
2561 | /* If we are about to reject this, but we are not to test strictly, | |
2562 | try a very loose test. Only return failure if it fails also. */ | |
2563 | if (strict == 0) | |
0eadeb15 | 2564 | return constrain_operands (-1); |
2055cea7 RK |
2565 | else |
2566 | return 0; | |
2567 | } | |
2568 | ||
2569 | /* Return 1 iff OPERAND (assumed to be a REG rtx) | |
38a448ca | 2570 | is a hard reg in class CLASS when its regno is offset by OFFSET |
2055cea7 RK |
2571 | and changed to mode MODE. |
2572 | If REG occupies multiple hard regs, all of them must be in CLASS. */ | |
2573 | ||
2574 | int | |
2575 | reg_fits_class_p (operand, class, offset, mode) | |
2576 | rtx operand; | |
2577 | register enum reg_class class; | |
2578 | int offset; | |
2579 | enum machine_mode mode; | |
2580 | { | |
2581 | register int regno = REGNO (operand); | |
2582 | if (regno < FIRST_PSEUDO_REGISTER | |
2583 | && TEST_HARD_REG_BIT (reg_class_contents[(int) class], | |
2584 | regno + offset)) | |
2585 | { | |
2586 | register int sr; | |
2587 | regno += offset; | |
2588 | for (sr = HARD_REGNO_NREGS (regno, mode) - 1; | |
2589 | sr > 0; sr--) | |
2590 | if (! TEST_HARD_REG_BIT (reg_class_contents[(int) class], | |
2591 | regno + sr)) | |
2592 | break; | |
2593 | return sr == 0; | |
2594 | } | |
2595 | ||
2596 | return 0; | |
2597 | } | |
2598 | ||
2599 | #endif /* REGISTER_CONSTRAINTS */ | |
ca545bb5 BM |
2600 | \f |
2601 | /* Do the splitting of insns in the block B. Only try to actually split if | |
2602 | DO_SPLIT is true; otherwise, just remove nops. */ | |
2603 | ||
2604 | void | |
2605 | split_block_insns (b, do_split) | |
2606 | int b; | |
2607 | int do_split; | |
2608 | { | |
2609 | rtx insn, next; | |
2610 | ||
2611 | for (insn = BLOCK_HEAD (b);; insn = next) | |
2612 | { | |
2613 | rtx set; | |
2614 | ||
2615 | /* Can't use `next_real_insn' because that | |
2616 | might go across CODE_LABELS and short-out basic blocks. */ | |
2617 | next = NEXT_INSN (insn); | |
2618 | if (GET_CODE (insn) != INSN) | |
2619 | { | |
2620 | if (insn == BLOCK_END (b)) | |
2621 | break; | |
2622 | ||
2623 | continue; | |
2624 | } | |
2625 | ||
2626 | /* Don't split no-op move insns. These should silently disappear | |
2627 | later in final. Splitting such insns would break the code | |
2628 | that handles REG_NO_CONFLICT blocks. */ | |
2629 | set = single_set (insn); | |
2630 | if (set && rtx_equal_p (SET_SRC (set), SET_DEST (set))) | |
2631 | { | |
2632 | if (insn == BLOCK_END (b)) | |
2633 | break; | |
2634 | ||
2635 | /* Nops get in the way while scheduling, so delete them now if | |
2636 | register allocation has already been done. It is too risky | |
2637 | to try to do this before register allocation, and there are | |
2638 | unlikely to be very many nops then anyways. */ | |
2639 | if (reload_completed) | |
2640 | { | |
2641 | ||
2642 | PUT_CODE (insn, NOTE); | |
2643 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
2644 | NOTE_SOURCE_FILE (insn) = 0; | |
2645 | } | |
2646 | ||
2647 | continue; | |
2648 | } | |
2649 | ||
2650 | if (do_split) | |
2651 | { | |
2652 | /* Split insns here to get max fine-grain parallelism. */ | |
2653 | rtx first = PREV_INSN (insn); | |
2654 | rtx notes = REG_NOTES (insn); | |
2655 | rtx last = try_split (PATTERN (insn), insn, 1); | |
2656 | ||
2657 | if (last != insn) | |
2658 | { | |
2659 | /* try_split returns the NOTE that INSN became. */ | |
2660 | first = NEXT_INSN (first); | |
2661 | update_flow_info (notes, first, last, insn); | |
2662 | ||
2663 | PUT_CODE (insn, NOTE); | |
2664 | NOTE_SOURCE_FILE (insn) = 0; | |
2665 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
2666 | if (insn == BLOCK_HEAD (b)) | |
2667 | BLOCK_HEAD (b) = first; | |
2668 | if (insn == BLOCK_END (b)) | |
2669 | { | |
2670 | BLOCK_END (b) = last; | |
2671 | break; | |
2672 | } | |
2673 | } | |
2674 | } | |
2675 | ||
2676 | if (insn == BLOCK_END (b)) | |
2677 | break; | |
2678 | } | |
2679 | } |