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2c88418c | 1 | /* Analyze RTL for C-Compiler |
af841dbd | 2 | Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
f759eb8b | 3 | 1999, 2000, 2001 Free Software Foundation, Inc. |
2c88418c RS |
4 | |
5 | This file is part of GNU CC. | |
6 | ||
7 | GNU CC is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU CC is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU CC; see the file COPYING. If not, write to | |
e99215a3 RK |
19 | the Free Software Foundation, 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
2c88418c RS |
21 | |
22 | ||
23 | #include "config.h" | |
670ee920 | 24 | #include "system.h" |
e35b9579 | 25 | #include "toplev.h" |
2c88418c | 26 | #include "rtl.h" |
3335f1d9 | 27 | #include "hard-reg-set.h" |
2c88418c | 28 | |
e2373f95 | 29 | /* Forward declarations */ |
91b2d119 | 30 | static void set_of_1 PARAMS ((rtx, rtx, void *)); |
4eb00163 | 31 | static void insn_dependent_p_1 PARAMS ((rtx, rtx, void *)); |
fce7e199 | 32 | static int computed_jump_p_1 PARAMS ((rtx)); |
e5c56fd9 | 33 | static int operand_preference PARAMS ((rtx)); |
2a1777af | 34 | |
2c88418c RS |
35 | /* Bit flags that specify the machine subtype we are compiling for. |
36 | Bits are tested using macros TARGET_... defined in the tm.h file | |
37 | and set by `-m...' switches. Must be defined in rtlanal.c. */ | |
38 | ||
39 | int target_flags; | |
40 | \f | |
41 | /* Return 1 if the value of X is unstable | |
42 | (would be different at a different point in the program). | |
43 | The frame pointer, arg pointer, etc. are considered stable | |
44 | (within one function) and so is anything marked `unchanging'. */ | |
45 | ||
46 | int | |
47 | rtx_unstable_p (x) | |
48 | rtx x; | |
49 | { | |
50 | register RTX_CODE code = GET_CODE (x); | |
51 | register int i; | |
6f7d635c | 52 | register const char *fmt; |
2c88418c | 53 | |
ae0fb1b9 JW |
54 | switch (code) |
55 | { | |
56 | case MEM: | |
57 | return ! RTX_UNCHANGING_P (x) || rtx_unstable_p (XEXP (x, 0)); | |
2c88418c | 58 | |
ae0fb1b9 JW |
59 | case QUEUED: |
60 | return 1; | |
2c88418c | 61 | |
978f547f | 62 | case ADDRESSOF: |
ae0fb1b9 JW |
63 | case CONST: |
64 | case CONST_INT: | |
65 | case CONST_DOUBLE: | |
66 | case SYMBOL_REF: | |
67 | case LABEL_REF: | |
68 | return 0; | |
2c88418c | 69 | |
ae0fb1b9 JW |
70 | case REG: |
71 | /* As in rtx_varies_p, we have to use the actual rtx, not reg number. */ | |
c0fc376b | 72 | if (x == frame_pointer_rtx || x == hard_frame_pointer_rtx |
3335f1d9 JL |
73 | /* The arg pointer varies if it is not a fixed register. */ |
74 | || (x == arg_pointer_rtx && fixed_regs[ARG_POINTER_REGNUM]) | |
75 | || RTX_UNCHANGING_P (x)) | |
c0fc376b RH |
76 | return 0; |
77 | #ifndef PIC_OFFSET_TABLE_REG_CALL_CLOBBERED | |
78 | /* ??? When call-clobbered, the value is stable modulo the restore | |
79 | that must happen after a call. This currently screws up local-alloc | |
80 | into believing that the restore is not needed. */ | |
81 | if (x == pic_offset_table_rtx) | |
82 | return 0; | |
83 | #endif | |
84 | return 1; | |
ae0fb1b9 JW |
85 | |
86 | case ASM_OPERANDS: | |
87 | if (MEM_VOLATILE_P (x)) | |
88 | return 1; | |
89 | ||
90 | /* FALLTHROUGH */ | |
91 | ||
92 | default: | |
93 | break; | |
94 | } | |
2c88418c RS |
95 | |
96 | fmt = GET_RTX_FORMAT (code); | |
97 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
98 | if (fmt[i] == 'e') | |
9c82ac6b JW |
99 | { |
100 | if (rtx_unstable_p (XEXP (x, i))) | |
101 | return 1; | |
102 | } | |
103 | else if (fmt[i] == 'E') | |
104 | { | |
105 | int j; | |
106 | for (j = 0; j < XVECLEN (x, i); j++) | |
107 | if (rtx_unstable_p (XVECEXP (x, i, j))) | |
108 | return 1; | |
109 | } | |
110 | ||
2c88418c RS |
111 | return 0; |
112 | } | |
113 | ||
114 | /* Return 1 if X has a value that can vary even between two | |
115 | executions of the program. 0 means X can be compared reliably | |
116 | against certain constants or near-constants. | |
e38fe8e0 BS |
117 | FOR_ALIAS is nonzero if we are called from alias analysis; if it is |
118 | zero, we are slightly more conservative. | |
2c88418c RS |
119 | The frame pointer and the arg pointer are considered constant. */ |
120 | ||
121 | int | |
e38fe8e0 | 122 | rtx_varies_p (x, for_alias) |
2c88418c | 123 | rtx x; |
e38fe8e0 | 124 | int for_alias; |
2c88418c RS |
125 | { |
126 | register RTX_CODE code = GET_CODE (x); | |
127 | register int i; | |
6f7d635c | 128 | register const char *fmt; |
2c88418c RS |
129 | |
130 | switch (code) | |
131 | { | |
132 | case MEM: | |
e38fe8e0 | 133 | return ! RTX_UNCHANGING_P (x) || rtx_varies_p (XEXP (x, 0), for_alias); |
55efb413 | 134 | |
2c88418c RS |
135 | case QUEUED: |
136 | return 1; | |
137 | ||
138 | case CONST: | |
139 | case CONST_INT: | |
140 | case CONST_DOUBLE: | |
141 | case SYMBOL_REF: | |
142 | case LABEL_REF: | |
143 | return 0; | |
144 | ||
145 | case REG: | |
146 | /* Note that we have to test for the actual rtx used for the frame | |
147 | and arg pointers and not just the register number in case we have | |
148 | eliminated the frame and/or arg pointer and are using it | |
149 | for pseudos. */ | |
c0fc376b | 150 | if (x == frame_pointer_rtx || x == hard_frame_pointer_rtx |
3335f1d9 JL |
151 | /* The arg pointer varies if it is not a fixed register. */ |
152 | || (x == arg_pointer_rtx && fixed_regs[ARG_POINTER_REGNUM])) | |
c0fc376b | 153 | return 0; |
e38fe8e0 BS |
154 | if (x == pic_offset_table_rtx |
155 | #ifdef PIC_OFFSET_TABLE_REG_CALL_CLOBBERED | |
156 | /* ??? When call-clobbered, the value is stable modulo the restore | |
157 | that must happen after a call. This currently screws up | |
158 | local-alloc into believing that the restore is not needed, so we | |
159 | must return 0 only if we are called from alias analysis. */ | |
160 | && for_alias | |
c0fc376b | 161 | #endif |
e38fe8e0 BS |
162 | ) |
163 | return 0; | |
c0fc376b | 164 | return 1; |
2c88418c RS |
165 | |
166 | case LO_SUM: | |
167 | /* The operand 0 of a LO_SUM is considered constant | |
e7d96a83 JW |
168 | (in fact it is related specifically to operand 1) |
169 | during alias analysis. */ | |
170 | return (! for_alias && rtx_varies_p (XEXP (x, 0), for_alias)) | |
171 | || rtx_varies_p (XEXP (x, 1), for_alias); | |
e9a25f70 | 172 | |
ae0fb1b9 JW |
173 | case ASM_OPERANDS: |
174 | if (MEM_VOLATILE_P (x)) | |
175 | return 1; | |
176 | ||
177 | /* FALLTHROUGH */ | |
178 | ||
e9a25f70 JL |
179 | default: |
180 | break; | |
2c88418c RS |
181 | } |
182 | ||
183 | fmt = GET_RTX_FORMAT (code); | |
184 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
185 | if (fmt[i] == 'e') | |
9c82ac6b | 186 | { |
e38fe8e0 | 187 | if (rtx_varies_p (XEXP (x, i), for_alias)) |
9c82ac6b JW |
188 | return 1; |
189 | } | |
190 | else if (fmt[i] == 'E') | |
191 | { | |
192 | int j; | |
193 | for (j = 0; j < XVECLEN (x, i); j++) | |
e38fe8e0 | 194 | if (rtx_varies_p (XVECEXP (x, i, j), for_alias)) |
9c82ac6b JW |
195 | return 1; |
196 | } | |
197 | ||
2c88418c RS |
198 | return 0; |
199 | } | |
200 | ||
201 | /* Return 0 if the use of X as an address in a MEM can cause a trap. */ | |
202 | ||
e38fe8e0 | 203 | int |
2c88418c RS |
204 | rtx_addr_can_trap_p (x) |
205 | register rtx x; | |
206 | { | |
207 | register enum rtx_code code = GET_CODE (x); | |
208 | ||
209 | switch (code) | |
210 | { | |
211 | case SYMBOL_REF: | |
ff0b6b99 FS |
212 | return SYMBOL_REF_WEAK (x); |
213 | ||
2c88418c | 214 | case LABEL_REF: |
2c88418c RS |
215 | return 0; |
216 | ||
217 | case REG: | |
218 | /* As in rtx_varies_p, we have to use the actual rtx, not reg number. */ | |
4f73495e RH |
219 | if (x == frame_pointer_rtx || x == hard_frame_pointer_rtx |
220 | || x == stack_pointer_rtx | |
221 | /* The arg pointer varies if it is not a fixed register. */ | |
222 | || (x == arg_pointer_rtx && fixed_regs[ARG_POINTER_REGNUM])) | |
223 | return 0; | |
224 | /* All of the virtual frame registers are stack references. */ | |
225 | if (REGNO (x) >= FIRST_VIRTUAL_REGISTER | |
226 | && REGNO (x) <= LAST_VIRTUAL_REGISTER) | |
227 | return 0; | |
228 | return 1; | |
2c88418c RS |
229 | |
230 | case CONST: | |
231 | return rtx_addr_can_trap_p (XEXP (x, 0)); | |
232 | ||
233 | case PLUS: | |
234 | /* An address is assumed not to trap if it is an address that can't | |
55efb413 JW |
235 | trap plus a constant integer or it is the pic register plus a |
236 | constant. */ | |
237 | return ! ((! rtx_addr_can_trap_p (XEXP (x, 0)) | |
238 | && GET_CODE (XEXP (x, 1)) == CONST_INT) | |
239 | || (XEXP (x, 0) == pic_offset_table_rtx | |
240 | && CONSTANT_P (XEXP (x, 1)))); | |
2c88418c RS |
241 | |
242 | case LO_SUM: | |
4f73495e | 243 | case PRE_MODIFY: |
2c88418c | 244 | return rtx_addr_can_trap_p (XEXP (x, 1)); |
4f73495e RH |
245 | |
246 | case PRE_DEC: | |
247 | case PRE_INC: | |
248 | case POST_DEC: | |
249 | case POST_INC: | |
250 | case POST_MODIFY: | |
251 | return rtx_addr_can_trap_p (XEXP (x, 0)); | |
252 | ||
e9a25f70 JL |
253 | default: |
254 | break; | |
2c88418c RS |
255 | } |
256 | ||
257 | /* If it isn't one of the case above, it can cause a trap. */ | |
258 | return 1; | |
259 | } | |
260 | ||
261 | /* Return 1 if X refers to a memory location whose address | |
262 | cannot be compared reliably with constant addresses, | |
e38fe8e0 BS |
263 | or if X refers to a BLKmode memory object. |
264 | FOR_ALIAS is nonzero if we are called from alias analysis; if it is | |
265 | zero, we are slightly more conservative. */ | |
2c88418c RS |
266 | |
267 | int | |
e38fe8e0 | 268 | rtx_addr_varies_p (x, for_alias) |
2c88418c | 269 | rtx x; |
e38fe8e0 | 270 | int for_alias; |
2c88418c RS |
271 | { |
272 | register enum rtx_code code; | |
273 | register int i; | |
6f7d635c | 274 | register const char *fmt; |
2c88418c RS |
275 | |
276 | if (x == 0) | |
277 | return 0; | |
278 | ||
279 | code = GET_CODE (x); | |
280 | if (code == MEM) | |
e38fe8e0 | 281 | return GET_MODE (x) == BLKmode || rtx_varies_p (XEXP (x, 0), for_alias); |
2c88418c RS |
282 | |
283 | fmt = GET_RTX_FORMAT (code); | |
284 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
285 | if (fmt[i] == 'e') | |
833c0b26 | 286 | { |
e38fe8e0 | 287 | if (rtx_addr_varies_p (XEXP (x, i), for_alias)) |
833c0b26 RK |
288 | return 1; |
289 | } | |
290 | else if (fmt[i] == 'E') | |
291 | { | |
292 | int j; | |
293 | for (j = 0; j < XVECLEN (x, i); j++) | |
e38fe8e0 | 294 | if (rtx_addr_varies_p (XVECEXP (x, i, j), for_alias)) |
833c0b26 RK |
295 | return 1; |
296 | } | |
2c88418c RS |
297 | return 0; |
298 | } | |
299 | \f | |
300 | /* Return the value of the integer term in X, if one is apparent; | |
301 | otherwise return 0. | |
302 | Only obvious integer terms are detected. | |
303 | This is used in cse.c with the `related_value' field.*/ | |
304 | ||
c166a311 | 305 | HOST_WIDE_INT |
2c88418c RS |
306 | get_integer_term (x) |
307 | rtx x; | |
308 | { | |
309 | if (GET_CODE (x) == CONST) | |
310 | x = XEXP (x, 0); | |
311 | ||
312 | if (GET_CODE (x) == MINUS | |
313 | && GET_CODE (XEXP (x, 1)) == CONST_INT) | |
314 | return - INTVAL (XEXP (x, 1)); | |
315 | if (GET_CODE (x) == PLUS | |
316 | && GET_CODE (XEXP (x, 1)) == CONST_INT) | |
317 | return INTVAL (XEXP (x, 1)); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | /* If X is a constant, return the value sans apparent integer term; | |
322 | otherwise return 0. | |
323 | Only obvious integer terms are detected. */ | |
324 | ||
325 | rtx | |
326 | get_related_value (x) | |
327 | rtx x; | |
328 | { | |
329 | if (GET_CODE (x) != CONST) | |
330 | return 0; | |
331 | x = XEXP (x, 0); | |
332 | if (GET_CODE (x) == PLUS | |
333 | && GET_CODE (XEXP (x, 1)) == CONST_INT) | |
334 | return XEXP (x, 0); | |
335 | else if (GET_CODE (x) == MINUS | |
336 | && GET_CODE (XEXP (x, 1)) == CONST_INT) | |
337 | return XEXP (x, 0); | |
338 | return 0; | |
339 | } | |
340 | \f | |
4b983fdc RH |
341 | /* Return the number of places FIND appears within X. If COUNT_DEST is |
342 | zero, we do not count occurrences inside the destination of a SET. */ | |
343 | ||
344 | int | |
345 | count_occurrences (x, find, count_dest) | |
346 | rtx x, find; | |
347 | int count_dest; | |
348 | { | |
349 | int i, j; | |
350 | enum rtx_code code; | |
351 | const char *format_ptr; | |
352 | int count; | |
353 | ||
354 | if (x == find) | |
355 | return 1; | |
356 | ||
357 | code = GET_CODE (x); | |
358 | ||
359 | switch (code) | |
360 | { | |
361 | case REG: | |
362 | case CONST_INT: | |
363 | case CONST_DOUBLE: | |
364 | case SYMBOL_REF: | |
365 | case CODE_LABEL: | |
366 | case PC: | |
367 | case CC0: | |
368 | return 0; | |
369 | ||
370 | case MEM: | |
371 | if (GET_CODE (find) == MEM && rtx_equal_p (x, find)) | |
372 | return 1; | |
373 | break; | |
374 | ||
375 | case SET: | |
376 | if (SET_DEST (x) == find && ! count_dest) | |
377 | return count_occurrences (SET_SRC (x), find, count_dest); | |
378 | break; | |
379 | ||
380 | default: | |
381 | break; | |
382 | } | |
383 | ||
384 | format_ptr = GET_RTX_FORMAT (code); | |
385 | count = 0; | |
386 | ||
387 | for (i = 0; i < GET_RTX_LENGTH (code); i++) | |
388 | { | |
389 | switch (*format_ptr++) | |
390 | { | |
391 | case 'e': | |
392 | count += count_occurrences (XEXP (x, i), find, count_dest); | |
393 | break; | |
394 | ||
395 | case 'E': | |
396 | for (j = 0; j < XVECLEN (x, i); j++) | |
397 | count += count_occurrences (XVECEXP (x, i, j), find, count_dest); | |
398 | break; | |
399 | } | |
400 | } | |
401 | return count; | |
402 | } | |
403 | \f | |
2c88418c RS |
404 | /* Nonzero if register REG appears somewhere within IN. |
405 | Also works if REG is not a register; in this case it checks | |
406 | for a subexpression of IN that is Lisp "equal" to REG. */ | |
407 | ||
408 | int | |
409 | reg_mentioned_p (reg, in) | |
410 | register rtx reg, in; | |
411 | { | |
6f7d635c | 412 | register const char *fmt; |
2c88418c RS |
413 | register int i; |
414 | register enum rtx_code code; | |
415 | ||
416 | if (in == 0) | |
417 | return 0; | |
418 | ||
419 | if (reg == in) | |
420 | return 1; | |
421 | ||
422 | if (GET_CODE (in) == LABEL_REF) | |
423 | return reg == XEXP (in, 0); | |
424 | ||
425 | code = GET_CODE (in); | |
426 | ||
427 | switch (code) | |
428 | { | |
429 | /* Compare registers by number. */ | |
430 | case REG: | |
431 | return GET_CODE (reg) == REG && REGNO (in) == REGNO (reg); | |
432 | ||
433 | /* These codes have no constituent expressions | |
434 | and are unique. */ | |
435 | case SCRATCH: | |
436 | case CC0: | |
437 | case PC: | |
438 | return 0; | |
439 | ||
440 | case CONST_INT: | |
441 | return GET_CODE (reg) == CONST_INT && INTVAL (in) == INTVAL (reg); | |
442 | ||
443 | case CONST_DOUBLE: | |
444 | /* These are kept unique for a given value. */ | |
445 | return 0; | |
e9a25f70 JL |
446 | |
447 | default: | |
448 | break; | |
2c88418c RS |
449 | } |
450 | ||
451 | if (GET_CODE (reg) == code && rtx_equal_p (reg, in)) | |
452 | return 1; | |
453 | ||
454 | fmt = GET_RTX_FORMAT (code); | |
455 | ||
456 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
457 | { | |
458 | if (fmt[i] == 'E') | |
459 | { | |
460 | register int j; | |
461 | for (j = XVECLEN (in, i) - 1; j >= 0; j--) | |
462 | if (reg_mentioned_p (reg, XVECEXP (in, i, j))) | |
463 | return 1; | |
464 | } | |
465 | else if (fmt[i] == 'e' | |
466 | && reg_mentioned_p (reg, XEXP (in, i))) | |
467 | return 1; | |
468 | } | |
469 | return 0; | |
470 | } | |
471 | \f | |
472 | /* Return 1 if in between BEG and END, exclusive of BEG and END, there is | |
473 | no CODE_LABEL insn. */ | |
474 | ||
475 | int | |
476 | no_labels_between_p (beg, end) | |
477 | rtx beg, end; | |
478 | { | |
479 | register rtx p; | |
978f547f JH |
480 | if (beg == end) |
481 | return 0; | |
2c88418c RS |
482 | for (p = NEXT_INSN (beg); p != end; p = NEXT_INSN (p)) |
483 | if (GET_CODE (p) == CODE_LABEL) | |
484 | return 0; | |
485 | return 1; | |
486 | } | |
487 | ||
3ec2b590 R |
488 | /* Return 1 if in between BEG and END, exclusive of BEG and END, there is |
489 | no JUMP_INSN insn. */ | |
490 | ||
491 | int | |
492 | no_jumps_between_p (beg, end) | |
493 | rtx beg, end; | |
494 | { | |
495 | register rtx p; | |
496 | for (p = NEXT_INSN (beg); p != end; p = NEXT_INSN (p)) | |
497 | if (GET_CODE (p) == JUMP_INSN) | |
498 | return 0; | |
499 | return 1; | |
500 | } | |
501 | ||
2c88418c RS |
502 | /* Nonzero if register REG is used in an insn between |
503 | FROM_INSN and TO_INSN (exclusive of those two). */ | |
504 | ||
505 | int | |
506 | reg_used_between_p (reg, from_insn, to_insn) | |
507 | rtx reg, from_insn, to_insn; | |
508 | { | |
509 | register rtx insn; | |
510 | ||
511 | if (from_insn == to_insn) | |
512 | return 0; | |
513 | ||
514 | for (insn = NEXT_INSN (from_insn); insn != to_insn; insn = NEXT_INSN (insn)) | |
2c3c49de | 515 | if (INSN_P (insn) |
8f3e7a26 RK |
516 | && (reg_overlap_mentioned_p (reg, PATTERN (insn)) |
517 | || (GET_CODE (insn) == CALL_INSN | |
518 | && (find_reg_fusage (insn, USE, reg) | |
519 | || find_reg_fusage (insn, CLOBBER, reg))))) | |
2c88418c RS |
520 | return 1; |
521 | return 0; | |
522 | } | |
523 | \f | |
524 | /* Nonzero if the old value of X, a register, is referenced in BODY. If X | |
525 | is entirely replaced by a new value and the only use is as a SET_DEST, | |
526 | we do not consider it a reference. */ | |
527 | ||
528 | int | |
529 | reg_referenced_p (x, body) | |
530 | rtx x; | |
531 | rtx body; | |
532 | { | |
533 | int i; | |
534 | ||
535 | switch (GET_CODE (body)) | |
536 | { | |
537 | case SET: | |
538 | if (reg_overlap_mentioned_p (x, SET_SRC (body))) | |
539 | return 1; | |
540 | ||
541 | /* If the destination is anything other than CC0, PC, a REG or a SUBREG | |
542 | of a REG that occupies all of the REG, the insn references X if | |
543 | it is mentioned in the destination. */ | |
544 | if (GET_CODE (SET_DEST (body)) != CC0 | |
545 | && GET_CODE (SET_DEST (body)) != PC | |
546 | && GET_CODE (SET_DEST (body)) != REG | |
547 | && ! (GET_CODE (SET_DEST (body)) == SUBREG | |
548 | && GET_CODE (SUBREG_REG (SET_DEST (body))) == REG | |
549 | && (((GET_MODE_SIZE (GET_MODE (SUBREG_REG (SET_DEST (body)))) | |
550 | + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD) | |
551 | == ((GET_MODE_SIZE (GET_MODE (SET_DEST (body))) | |
552 | + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD))) | |
553 | && reg_overlap_mentioned_p (x, SET_DEST (body))) | |
554 | return 1; | |
e9a25f70 | 555 | return 0; |
2c88418c RS |
556 | |
557 | case ASM_OPERANDS: | |
558 | for (i = ASM_OPERANDS_INPUT_LENGTH (body) - 1; i >= 0; i--) | |
559 | if (reg_overlap_mentioned_p (x, ASM_OPERANDS_INPUT (body, i))) | |
560 | return 1; | |
e9a25f70 | 561 | return 0; |
2c88418c RS |
562 | |
563 | case CALL: | |
564 | case USE: | |
14a774a9 | 565 | case IF_THEN_ELSE: |
2c88418c RS |
566 | return reg_overlap_mentioned_p (x, body); |
567 | ||
568 | case TRAP_IF: | |
569 | return reg_overlap_mentioned_p (x, TRAP_CONDITION (body)); | |
570 | ||
2ac4fed0 RK |
571 | case UNSPEC: |
572 | case UNSPEC_VOLATILE: | |
2f9fb4c2 R |
573 | for (i = XVECLEN (body, 0) - 1; i >= 0; i--) |
574 | if (reg_overlap_mentioned_p (x, XVECEXP (body, 0, i))) | |
575 | return 1; | |
576 | return 0; | |
577 | ||
2c88418c RS |
578 | case PARALLEL: |
579 | for (i = XVECLEN (body, 0) - 1; i >= 0; i--) | |
580 | if (reg_referenced_p (x, XVECEXP (body, 0, i))) | |
581 | return 1; | |
e9a25f70 JL |
582 | return 0; |
583 | ||
0d3ffb5a GK |
584 | case CLOBBER: |
585 | if (GET_CODE (XEXP (body, 0)) == MEM) | |
586 | if (reg_overlap_mentioned_p (x, XEXP (XEXP (body, 0), 0))) | |
587 | return 1; | |
588 | return 0; | |
589 | ||
0c99ec5c RH |
590 | case COND_EXEC: |
591 | if (reg_overlap_mentioned_p (x, COND_EXEC_TEST (body))) | |
592 | return 1; | |
593 | return reg_referenced_p (x, COND_EXEC_CODE (body)); | |
594 | ||
e9a25f70 JL |
595 | default: |
596 | return 0; | |
2c88418c | 597 | } |
2c88418c RS |
598 | } |
599 | ||
600 | /* Nonzero if register REG is referenced in an insn between | |
601 | FROM_INSN and TO_INSN (exclusive of those two). Sets of REG do | |
0f41302f | 602 | not count. */ |
2c88418c RS |
603 | |
604 | int | |
605 | reg_referenced_between_p (reg, from_insn, to_insn) | |
606 | rtx reg, from_insn, to_insn; | |
607 | { | |
608 | register rtx insn; | |
609 | ||
610 | if (from_insn == to_insn) | |
611 | return 0; | |
612 | ||
613 | for (insn = NEXT_INSN (from_insn); insn != to_insn; insn = NEXT_INSN (insn)) | |
2c3c49de | 614 | if (INSN_P (insn) |
8f3e7a26 RK |
615 | && (reg_referenced_p (reg, PATTERN (insn)) |
616 | || (GET_CODE (insn) == CALL_INSN | |
617 | && find_reg_fusage (insn, USE, reg)))) | |
2c88418c RS |
618 | return 1; |
619 | return 0; | |
620 | } | |
621 | \f | |
622 | /* Nonzero if register REG is set or clobbered in an insn between | |
623 | FROM_INSN and TO_INSN (exclusive of those two). */ | |
624 | ||
625 | int | |
626 | reg_set_between_p (reg, from_insn, to_insn) | |
627 | rtx reg, from_insn, to_insn; | |
628 | { | |
629 | register rtx insn; | |
630 | ||
631 | if (from_insn == to_insn) | |
632 | return 0; | |
633 | ||
634 | for (insn = NEXT_INSN (from_insn); insn != to_insn; insn = NEXT_INSN (insn)) | |
2c3c49de | 635 | if (INSN_P (insn) && reg_set_p (reg, insn)) |
2c88418c RS |
636 | return 1; |
637 | return 0; | |
638 | } | |
639 | ||
640 | /* Internals of reg_set_between_p. */ | |
2c88418c RS |
641 | int |
642 | reg_set_p (reg, insn) | |
643 | rtx reg, insn; | |
644 | { | |
645 | rtx body = insn; | |
646 | ||
647 | /* We can be passed an insn or part of one. If we are passed an insn, | |
648 | check if a side-effect of the insn clobbers REG. */ | |
2c3c49de | 649 | if (INSN_P (insn)) |
2c88418c RS |
650 | { |
651 | if (FIND_REG_INC_NOTE (insn, reg) | |
652 | || (GET_CODE (insn) == CALL_INSN | |
653 | /* We'd like to test call_used_regs here, but rtlanal.c can't | |
654 | reference that variable due to its use in genattrtab. So | |
8f3e7a26 RK |
655 | we'll just be more conservative. |
656 | ||
657 | ??? Unless we could ensure that the CALL_INSN_FUNCTION_USAGE | |
658 | information holds all clobbered registers. */ | |
2c88418c RS |
659 | && ((GET_CODE (reg) == REG |
660 | && REGNO (reg) < FIRST_PSEUDO_REGISTER) | |
8f3e7a26 RK |
661 | || GET_CODE (reg) == MEM |
662 | || find_reg_fusage (insn, CLOBBER, reg)))) | |
2c88418c RS |
663 | return 1; |
664 | ||
665 | body = PATTERN (insn); | |
666 | } | |
667 | ||
91b2d119 | 668 | return set_of (reg, insn) != NULL_RTX; |
2c88418c RS |
669 | } |
670 | ||
a2e1a0bf RH |
671 | /* Similar to reg_set_between_p, but check all registers in X. Return 0 |
672 | only if none of them are modified between START and END. Do not | |
673 | consider non-registers one way or the other. */ | |
674 | ||
675 | int | |
676 | regs_set_between_p (x, start, end) | |
677 | rtx x; | |
678 | rtx start, end; | |
679 | { | |
680 | enum rtx_code code = GET_CODE (x); | |
6f7d635c | 681 | const char *fmt; |
a2e1a0bf RH |
682 | int i, j; |
683 | ||
684 | switch (code) | |
685 | { | |
686 | case CONST_INT: | |
687 | case CONST_DOUBLE: | |
688 | case CONST: | |
689 | case SYMBOL_REF: | |
690 | case LABEL_REF: | |
691 | case PC: | |
692 | case CC0: | |
693 | return 0; | |
694 | ||
695 | case REG: | |
696 | return reg_set_between_p (x, start, end); | |
697 | ||
698 | default: | |
699 | break; | |
700 | } | |
701 | ||
702 | fmt = GET_RTX_FORMAT (code); | |
703 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
704 | { | |
705 | if (fmt[i] == 'e' && regs_set_between_p (XEXP (x, i), start, end)) | |
706 | return 1; | |
707 | ||
708 | else if (fmt[i] == 'E') | |
709 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) | |
710 | if (regs_set_between_p (XVECEXP (x, i, j), start, end)) | |
711 | return 1; | |
712 | } | |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
2c88418c RS |
717 | /* Similar to reg_set_between_p, but check all registers in X. Return 0 |
718 | only if none of them are modified between START and END. Return 1 if | |
719 | X contains a MEM; this routine does not perform any memory aliasing. */ | |
720 | ||
721 | int | |
722 | modified_between_p (x, start, end) | |
723 | rtx x; | |
724 | rtx start, end; | |
725 | { | |
726 | enum rtx_code code = GET_CODE (x); | |
6f7d635c | 727 | const char *fmt; |
f8163c92 | 728 | int i, j; |
2c88418c RS |
729 | |
730 | switch (code) | |
731 | { | |
732 | case CONST_INT: | |
733 | case CONST_DOUBLE: | |
734 | case CONST: | |
735 | case SYMBOL_REF: | |
736 | case LABEL_REF: | |
737 | return 0; | |
738 | ||
739 | case PC: | |
740 | case CC0: | |
741 | return 1; | |
742 | ||
743 | case MEM: | |
744 | /* If the memory is not constant, assume it is modified. If it is | |
745 | constant, we still have to check the address. */ | |
746 | if (! RTX_UNCHANGING_P (x)) | |
747 | return 1; | |
748 | break; | |
749 | ||
750 | case REG: | |
751 | return reg_set_between_p (x, start, end); | |
e9a25f70 JL |
752 | |
753 | default: | |
754 | break; | |
2c88418c RS |
755 | } |
756 | ||
757 | fmt = GET_RTX_FORMAT (code); | |
758 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
f8163c92 RK |
759 | { |
760 | if (fmt[i] == 'e' && modified_between_p (XEXP (x, i), start, end)) | |
761 | return 1; | |
762 | ||
d4757e6a | 763 | else if (fmt[i] == 'E') |
f8163c92 RK |
764 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) |
765 | if (modified_between_p (XVECEXP (x, i, j), start, end)) | |
766 | return 1; | |
767 | } | |
768 | ||
769 | return 0; | |
770 | } | |
771 | ||
772 | /* Similar to reg_set_p, but check all registers in X. Return 0 only if none | |
773 | of them are modified in INSN. Return 1 if X contains a MEM; this routine | |
774 | does not perform any memory aliasing. */ | |
775 | ||
776 | int | |
777 | modified_in_p (x, insn) | |
778 | rtx x; | |
779 | rtx insn; | |
780 | { | |
781 | enum rtx_code code = GET_CODE (x); | |
6f7d635c | 782 | const char *fmt; |
f8163c92 RK |
783 | int i, j; |
784 | ||
785 | switch (code) | |
786 | { | |
787 | case CONST_INT: | |
788 | case CONST_DOUBLE: | |
789 | case CONST: | |
790 | case SYMBOL_REF: | |
791 | case LABEL_REF: | |
792 | return 0; | |
793 | ||
794 | case PC: | |
795 | case CC0: | |
2c88418c RS |
796 | return 1; |
797 | ||
f8163c92 RK |
798 | case MEM: |
799 | /* If the memory is not constant, assume it is modified. If it is | |
800 | constant, we still have to check the address. */ | |
801 | if (! RTX_UNCHANGING_P (x)) | |
802 | return 1; | |
803 | break; | |
804 | ||
805 | case REG: | |
806 | return reg_set_p (x, insn); | |
e9a25f70 JL |
807 | |
808 | default: | |
809 | break; | |
f8163c92 RK |
810 | } |
811 | ||
812 | fmt = GET_RTX_FORMAT (code); | |
813 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
814 | { | |
815 | if (fmt[i] == 'e' && modified_in_p (XEXP (x, i), insn)) | |
816 | return 1; | |
817 | ||
d4757e6a | 818 | else if (fmt[i] == 'E') |
f8163c92 RK |
819 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) |
820 | if (modified_in_p (XVECEXP (x, i, j), insn)) | |
821 | return 1; | |
822 | } | |
823 | ||
2c88418c RS |
824 | return 0; |
825 | } | |
a8393d5d | 826 | |
4eb00163 | 827 | /* Return true if anything in insn X is (anti,output,true) dependent on |
a8393d5d RH |
828 | anything in insn Y. */ |
829 | ||
830 | int | |
4eb00163 | 831 | insn_dependent_p (x, y) |
a8393d5d RH |
832 | rtx x, y; |
833 | { | |
834 | rtx tmp; | |
835 | ||
836 | if (! INSN_P (x) || ! INSN_P (y)) | |
837 | abort (); | |
838 | ||
839 | tmp = PATTERN (y); | |
4eb00163 | 840 | note_stores (PATTERN (x), insn_dependent_p_1, &tmp); |
a8393d5d RH |
841 | if (tmp == NULL_RTX) |
842 | return 1; | |
843 | ||
844 | tmp = PATTERN (x); | |
4eb00163 | 845 | note_stores (PATTERN (y), insn_dependent_p_1, &tmp); |
a8393d5d RH |
846 | if (tmp == NULL_RTX) |
847 | return 1; | |
848 | ||
849 | return 0; | |
850 | } | |
851 | ||
4eb00163 | 852 | /* A helper routine for insn_dependent_p called through note_stores. */ |
a8393d5d RH |
853 | |
854 | static void | |
4eb00163 | 855 | insn_dependent_p_1 (x, pat, data) |
a8393d5d RH |
856 | rtx x; |
857 | rtx pat ATTRIBUTE_UNUSED; | |
858 | void *data; | |
859 | { | |
860 | rtx * pinsn = (rtx *) data; | |
861 | ||
862 | if (*pinsn && reg_mentioned_p (x, *pinsn)) | |
863 | *pinsn = NULL_RTX; | |
864 | } | |
2c88418c | 865 | \f |
91b2d119 JH |
866 | /* Helper function for set_of. */ |
867 | struct set_of_data | |
868 | { | |
869 | rtx found; | |
870 | rtx pat; | |
871 | }; | |
872 | ||
873 | static void | |
874 | set_of_1 (x, pat, data1) | |
875 | rtx x; | |
876 | rtx pat; | |
877 | void *data1; | |
878 | { | |
879 | struct set_of_data *data = (struct set_of_data *) (data1); | |
880 | if (rtx_equal_p (x, data->pat) | |
881 | || (GET_CODE (x) != MEM && reg_overlap_mentioned_p (data->pat, x))) | |
882 | data->found = pat; | |
883 | } | |
884 | ||
885 | /* Give an INSN, return a SET or CLOBBER expression that does modify PAT | |
886 | (eighter directly or via STRICT_LOW_PART and similar modifiers). */ | |
887 | rtx | |
888 | set_of (pat, insn) | |
889 | rtx pat, insn; | |
890 | { | |
891 | struct set_of_data data; | |
892 | data.found = NULL_RTX; | |
893 | data.pat = pat; | |
894 | note_stores (INSN_P (insn) ? PATTERN (insn) : insn, set_of_1, &data); | |
895 | return data.found; | |
896 | } | |
897 | \f | |
2c88418c RS |
898 | /* Given an INSN, return a SET expression if this insn has only a single SET. |
899 | It may also have CLOBBERs, USEs, or SET whose output | |
900 | will not be used, which we ignore. */ | |
901 | ||
902 | rtx | |
2130b7fb BS |
903 | single_set_2 (insn, pat) |
904 | rtx insn, pat; | |
2c88418c | 905 | { |
c9b89a21 JH |
906 | rtx set = NULL; |
907 | int set_verified = 1; | |
2c88418c | 908 | int i; |
c9b89a21 | 909 | |
b1cdafbb | 910 | if (GET_CODE (pat) == PARALLEL) |
2c88418c | 911 | { |
c9b89a21 | 912 | for (i = 0; i < XVECLEN (pat, 0); i++) |
b1cdafbb | 913 | { |
c9b89a21 JH |
914 | rtx sub = XVECEXP (pat, 0, i); |
915 | switch (GET_CODE (sub)) | |
916 | { | |
917 | case USE: | |
918 | case CLOBBER: | |
919 | break; | |
920 | ||
921 | case SET: | |
922 | /* We can consider insns having multiple sets, where all | |
923 | but one are dead as single set insns. In common case | |
924 | only single set is present in the pattern so we want | |
925 | to avoid checking for REG_UNUSED notes unless neccesary. | |
926 | ||
927 | When we reach set first time, we just expect this is | |
928 | the single set we are looking for and only when more | |
929 | sets are found in the insn, we check them. */ | |
930 | if (!set_verified) | |
931 | { | |
932 | if (find_reg_note (insn, REG_UNUSED, SET_DEST (set)) | |
933 | && !side_effects_p (set)) | |
934 | set = NULL; | |
935 | else | |
936 | set_verified = 1; | |
937 | } | |
938 | if (!set) | |
939 | set = sub, set_verified = 0; | |
940 | else if (!find_reg_note (insn, REG_UNUSED, SET_DEST (sub)) | |
941 | || side_effects_p (sub)) | |
942 | return NULL_RTX; | |
943 | break; | |
944 | ||
945 | default: | |
946 | return NULL_RTX; | |
947 | } | |
787ccee0 | 948 | } |
2c88418c | 949 | } |
c9b89a21 | 950 | return set; |
2c88418c | 951 | } |
941c63ac JL |
952 | |
953 | /* Given an INSN, return nonzero if it has more than one SET, else return | |
954 | zero. */ | |
955 | ||
5f7d3786 | 956 | int |
941c63ac JL |
957 | multiple_sets (insn) |
958 | rtx insn; | |
959 | { | |
cae8acdd | 960 | int found; |
941c63ac JL |
961 | int i; |
962 | ||
963 | /* INSN must be an insn. */ | |
2c3c49de | 964 | if (! INSN_P (insn)) |
941c63ac JL |
965 | return 0; |
966 | ||
967 | /* Only a PARALLEL can have multiple SETs. */ | |
968 | if (GET_CODE (PATTERN (insn)) == PARALLEL) | |
969 | { | |
970 | for (i = 0, found = 0; i < XVECLEN (PATTERN (insn), 0); i++) | |
971 | if (GET_CODE (XVECEXP (PATTERN (insn), 0, i)) == SET) | |
972 | { | |
973 | /* If we have already found a SET, then return now. */ | |
974 | if (found) | |
975 | return 1; | |
976 | else | |
977 | found = 1; | |
978 | } | |
979 | } | |
980 | ||
981 | /* Either zero or one SET. */ | |
982 | return 0; | |
983 | } | |
2c88418c | 984 | \f |
7142e318 JW |
985 | /* Return nonzero if the destination of SET equals the source |
986 | and there are no side effects. */ | |
987 | ||
988 | int | |
989 | set_noop_p (set) | |
990 | rtx set; | |
991 | { | |
992 | rtx src = SET_SRC (set); | |
993 | rtx dst = SET_DEST (set); | |
994 | ||
995 | if (side_effects_p (src) || side_effects_p (dst)) | |
996 | return 0; | |
997 | ||
998 | if (GET_CODE (dst) == MEM && GET_CODE (src) == MEM) | |
999 | return rtx_equal_p (dst, src); | |
1000 | ||
1001 | if (GET_CODE (dst) == SIGN_EXTRACT | |
1002 | || GET_CODE (dst) == ZERO_EXTRACT) | |
1003 | return rtx_equal_p (XEXP (dst, 0), src) | |
1004 | && ! BYTES_BIG_ENDIAN && XEXP (dst, 2) == const0_rtx; | |
1005 | ||
1006 | if (GET_CODE (dst) == STRICT_LOW_PART) | |
1007 | dst = XEXP (dst, 0); | |
1008 | ||
1009 | if (GET_CODE (src) == SUBREG && GET_CODE (dst) == SUBREG) | |
1010 | { | |
1011 | if (SUBREG_BYTE (src) != SUBREG_BYTE (dst)) | |
1012 | return 0; | |
1013 | src = SUBREG_REG (src); | |
1014 | dst = SUBREG_REG (dst); | |
1015 | } | |
1016 | ||
1017 | return (GET_CODE (src) == REG && GET_CODE (dst) == REG | |
1018 | && REGNO (src) == REGNO (dst)); | |
1019 | } | |
1020 | ||
63be01fb JW |
1021 | /* Return the last thing that X was assigned from before *PINSN. If VALID_TO |
1022 | is not NULL_RTX then verify that the object is not modified up to VALID_TO. | |
1023 | If the object was modified, if we hit a partial assignment to X, or hit a | |
1024 | CODE_LABEL first, return X. If we found an assignment, update *PINSN to | |
1025 | point to it. ALLOW_HWREG is set to 1 if hardware registers are allowed to | |
1026 | be the src. */ | |
2c88418c RS |
1027 | |
1028 | rtx | |
89d3d442 | 1029 | find_last_value (x, pinsn, valid_to, allow_hwreg) |
2c88418c RS |
1030 | rtx x; |
1031 | rtx *pinsn; | |
1032 | rtx valid_to; | |
89d3d442 | 1033 | int allow_hwreg; |
2c88418c RS |
1034 | { |
1035 | rtx p; | |
1036 | ||
1037 | for (p = PREV_INSN (*pinsn); p && GET_CODE (p) != CODE_LABEL; | |
1038 | p = PREV_INSN (p)) | |
2c3c49de | 1039 | if (INSN_P (p)) |
2c88418c RS |
1040 | { |
1041 | rtx set = single_set (p); | |
c166a311 | 1042 | rtx note = find_reg_note (p, REG_EQUAL, NULL_RTX); |
2c88418c RS |
1043 | |
1044 | if (set && rtx_equal_p (x, SET_DEST (set))) | |
1045 | { | |
1046 | rtx src = SET_SRC (set); | |
1047 | ||
1048 | if (note && GET_CODE (XEXP (note, 0)) != EXPR_LIST) | |
1049 | src = XEXP (note, 0); | |
1050 | ||
63be01fb JW |
1051 | if ((valid_to == NULL_RTX |
1052 | || ! modified_between_p (src, PREV_INSN (p), valid_to)) | |
2c88418c RS |
1053 | /* Reject hard registers because we don't usually want |
1054 | to use them; we'd rather use a pseudo. */ | |
89d3d442 AM |
1055 | && (! (GET_CODE (src) == REG |
1056 | && REGNO (src) < FIRST_PSEUDO_REGISTER) || allow_hwreg)) | |
2c88418c RS |
1057 | { |
1058 | *pinsn = p; | |
1059 | return src; | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | /* If set in non-simple way, we don't have a value. */ | |
1064 | if (reg_set_p (x, p)) | |
1065 | break; | |
1066 | } | |
1067 | ||
1068 | return x; | |
1069 | } | |
1070 | \f | |
1071 | /* Return nonzero if register in range [REGNO, ENDREGNO) | |
1072 | appears either explicitly or implicitly in X | |
1073 | other than being stored into. | |
1074 | ||
1075 | References contained within the substructure at LOC do not count. | |
1076 | LOC may be zero, meaning don't ignore anything. */ | |
1077 | ||
1078 | int | |
1079 | refers_to_regno_p (regno, endregno, x, loc) | |
770ae6cc | 1080 | unsigned int regno, endregno; |
2c88418c RS |
1081 | rtx x; |
1082 | rtx *loc; | |
1083 | { | |
770ae6cc RK |
1084 | int i; |
1085 | unsigned int x_regno; | |
1086 | RTX_CODE code; | |
1087 | const char *fmt; | |
2c88418c RS |
1088 | |
1089 | repeat: | |
1090 | /* The contents of a REG_NONNEG note is always zero, so we must come here | |
1091 | upon repeat in case the last REG_NOTE is a REG_NONNEG note. */ | |
1092 | if (x == 0) | |
1093 | return 0; | |
1094 | ||
1095 | code = GET_CODE (x); | |
1096 | ||
1097 | switch (code) | |
1098 | { | |
1099 | case REG: | |
770ae6cc | 1100 | x_regno = REGNO (x); |
f8163c92 RK |
1101 | |
1102 | /* If we modifying the stack, frame, or argument pointer, it will | |
1103 | clobber a virtual register. In fact, we could be more precise, | |
1104 | but it isn't worth it. */ | |
770ae6cc | 1105 | if ((x_regno == STACK_POINTER_REGNUM |
f8163c92 | 1106 | #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM |
770ae6cc | 1107 | || x_regno == ARG_POINTER_REGNUM |
f8163c92 | 1108 | #endif |
770ae6cc | 1109 | || x_regno == FRAME_POINTER_REGNUM) |
f8163c92 RK |
1110 | && regno >= FIRST_VIRTUAL_REGISTER && regno <= LAST_VIRTUAL_REGISTER) |
1111 | return 1; | |
1112 | ||
770ae6cc RK |
1113 | return (endregno > x_regno |
1114 | && regno < x_regno + (x_regno < FIRST_PSEUDO_REGISTER | |
1115 | ? HARD_REGNO_NREGS (x_regno, GET_MODE (x)) | |
2c88418c RS |
1116 | : 1)); |
1117 | ||
1118 | case SUBREG: | |
1119 | /* If this is a SUBREG of a hard reg, we can see exactly which | |
1120 | registers are being modified. Otherwise, handle normally. */ | |
1121 | if (GET_CODE (SUBREG_REG (x)) == REG | |
1122 | && REGNO (SUBREG_REG (x)) < FIRST_PSEUDO_REGISTER) | |
1123 | { | |
ddef6bc7 | 1124 | unsigned int inner_regno = subreg_regno (x); |
770ae6cc | 1125 | unsigned int inner_endregno |
2c88418c RS |
1126 | = inner_regno + (inner_regno < FIRST_PSEUDO_REGISTER |
1127 | ? HARD_REGNO_NREGS (regno, GET_MODE (x)) : 1); | |
1128 | ||
1129 | return endregno > inner_regno && regno < inner_endregno; | |
1130 | } | |
1131 | break; | |
1132 | ||
1133 | case CLOBBER: | |
1134 | case SET: | |
1135 | if (&SET_DEST (x) != loc | |
1136 | /* Note setting a SUBREG counts as referring to the REG it is in for | |
1137 | a pseudo but not for hard registers since we can | |
1138 | treat each word individually. */ | |
1139 | && ((GET_CODE (SET_DEST (x)) == SUBREG | |
1140 | && loc != &SUBREG_REG (SET_DEST (x)) | |
1141 | && GET_CODE (SUBREG_REG (SET_DEST (x))) == REG | |
1142 | && REGNO (SUBREG_REG (SET_DEST (x))) >= FIRST_PSEUDO_REGISTER | |
1143 | && refers_to_regno_p (regno, endregno, | |
1144 | SUBREG_REG (SET_DEST (x)), loc)) | |
1145 | || (GET_CODE (SET_DEST (x)) != REG | |
1146 | && refers_to_regno_p (regno, endregno, SET_DEST (x), loc)))) | |
1147 | return 1; | |
1148 | ||
1149 | if (code == CLOBBER || loc == &SET_SRC (x)) | |
1150 | return 0; | |
1151 | x = SET_SRC (x); | |
1152 | goto repeat; | |
e9a25f70 JL |
1153 | |
1154 | default: | |
1155 | break; | |
2c88418c RS |
1156 | } |
1157 | ||
1158 | /* X does not match, so try its subexpressions. */ | |
1159 | ||
1160 | fmt = GET_RTX_FORMAT (code); | |
1161 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
1162 | { | |
1163 | if (fmt[i] == 'e' && loc != &XEXP (x, i)) | |
1164 | { | |
1165 | if (i == 0) | |
1166 | { | |
1167 | x = XEXP (x, 0); | |
1168 | goto repeat; | |
1169 | } | |
1170 | else | |
1171 | if (refers_to_regno_p (regno, endregno, XEXP (x, i), loc)) | |
1172 | return 1; | |
1173 | } | |
1174 | else if (fmt[i] == 'E') | |
1175 | { | |
1176 | register int j; | |
1177 | for (j = XVECLEN (x, i) - 1; j >=0; j--) | |
1178 | if (loc != &XVECEXP (x, i, j) | |
1179 | && refers_to_regno_p (regno, endregno, XVECEXP (x, i, j), loc)) | |
1180 | return 1; | |
1181 | } | |
1182 | } | |
1183 | return 0; | |
1184 | } | |
1185 | ||
1186 | /* Nonzero if modifying X will affect IN. If X is a register or a SUBREG, | |
1187 | we check if any register number in X conflicts with the relevant register | |
1188 | numbers. If X is a constant, return 0. If X is a MEM, return 1 iff IN | |
1189 | contains a MEM (we don't bother checking for memory addresses that can't | |
1190 | conflict because we expect this to be a rare case. */ | |
1191 | ||
1192 | int | |
1193 | reg_overlap_mentioned_p (x, in) | |
1194 | rtx x, in; | |
1195 | { | |
770ae6cc | 1196 | unsigned int regno, endregno; |
2c88418c | 1197 | |
b98b49ac JL |
1198 | /* Overly conservative. */ |
1199 | if (GET_CODE (x) == STRICT_LOW_PART) | |
1200 | x = XEXP (x, 0); | |
1201 | ||
1202 | /* If either argument is a constant, then modifying X can not affect IN. */ | |
1203 | if (CONSTANT_P (x) || CONSTANT_P (in)) | |
1204 | return 0; | |
0c99ec5c RH |
1205 | |
1206 | switch (GET_CODE (x)) | |
2c88418c | 1207 | { |
0c99ec5c | 1208 | case SUBREG: |
2c88418c RS |
1209 | regno = REGNO (SUBREG_REG (x)); |
1210 | if (regno < FIRST_PSEUDO_REGISTER) | |
ddef6bc7 | 1211 | regno = subreg_regno (x); |
0c99ec5c | 1212 | goto do_reg; |
2c88418c | 1213 | |
0c99ec5c RH |
1214 | case REG: |
1215 | regno = REGNO (x); | |
1216 | do_reg: | |
1217 | endregno = regno + (regno < FIRST_PSEUDO_REGISTER | |
1218 | ? HARD_REGNO_NREGS (regno, GET_MODE (x)) : 1); | |
9714cf43 | 1219 | return refers_to_regno_p (regno, endregno, in, (rtx*)0); |
2c88418c | 1220 | |
0c99ec5c RH |
1221 | case MEM: |
1222 | { | |
1223 | const char *fmt; | |
1224 | int i; | |
2c88418c | 1225 | |
0c99ec5c | 1226 | if (GET_CODE (in) == MEM) |
2c88418c RS |
1227 | return 1; |
1228 | ||
0c99ec5c RH |
1229 | fmt = GET_RTX_FORMAT (GET_CODE (in)); |
1230 | for (i = GET_RTX_LENGTH (GET_CODE (in)) - 1; i >= 0; i--) | |
1231 | if (fmt[i] == 'e' && reg_overlap_mentioned_p (x, XEXP (in, i))) | |
1232 | return 1; | |
c0222c21 | 1233 | |
0c99ec5c RH |
1234 | return 0; |
1235 | } | |
1236 | ||
1237 | case SCRATCH: | |
1238 | case PC: | |
1239 | case CC0: | |
1240 | return reg_mentioned_p (x, in); | |
1241 | ||
1242 | case PARALLEL: | |
37ceff9d | 1243 | { |
90d036a0 | 1244 | int i; |
37ceff9d RH |
1245 | |
1246 | /* If any register in here refers to it we return true. */ | |
7193d1dc RK |
1247 | for (i = XVECLEN (x, 0) - 1; i >= 0; i--) |
1248 | if (XEXP (XVECEXP (x, 0, i), 0) != 0 | |
1249 | && reg_overlap_mentioned_p (XEXP (XVECEXP (x, 0, i), 0), in)) | |
90d036a0 | 1250 | return 1; |
7193d1dc | 1251 | return 0; |
37ceff9d | 1252 | } |
2c88418c | 1253 | |
0c99ec5c RH |
1254 | default: |
1255 | break; | |
1256 | } | |
2c88418c | 1257 | |
0c99ec5c | 1258 | abort (); |
2c88418c RS |
1259 | } |
1260 | \f | |
2c88418c RS |
1261 | /* Return the last value to which REG was set prior to INSN. If we can't |
1262 | find it easily, return 0. | |
1263 | ||
4d9d7d9d RK |
1264 | We only return a REG, SUBREG, or constant because it is too hard to |
1265 | check if a MEM remains unchanged. */ | |
2c88418c RS |
1266 | |
1267 | rtx | |
1268 | reg_set_last (x, insn) | |
1269 | rtx x; | |
1270 | rtx insn; | |
1271 | { | |
1272 | rtx orig_insn = insn; | |
1273 | ||
2c88418c RS |
1274 | /* Scan backwards until reg_set_last_1 changed one of the above flags. |
1275 | Stop when we reach a label or X is a hard reg and we reach a | |
1276 | CALL_INSN (if reg_set_last_last_regno is a hard reg). | |
1277 | ||
1278 | If we find a set of X, ensure that its SET_SRC remains unchanged. */ | |
1279 | ||
6b02c316 RS |
1280 | /* We compare with <= here, because reg_set_last_last_regno |
1281 | is actually the number of the first reg *not* in X. */ | |
2c88418c RS |
1282 | for (; |
1283 | insn && GET_CODE (insn) != CODE_LABEL | |
1284 | && ! (GET_CODE (insn) == CALL_INSN | |
91b2d119 | 1285 | && REGNO (x) <= FIRST_PSEUDO_REGISTER); |
2c88418c | 1286 | insn = PREV_INSN (insn)) |
2c3c49de | 1287 | if (INSN_P (insn)) |
2c88418c | 1288 | { |
91b2d119 JH |
1289 | rtx set = set_of (x, insn); |
1290 | /* OK, this function modify our register. See if we understand it. */ | |
1291 | if (set) | |
2c88418c | 1292 | { |
91b2d119 JH |
1293 | rtx last_value; |
1294 | if (GET_CODE (set) != SET || SET_DEST (set) != x) | |
1295 | return 0; | |
1296 | last_value = SET_SRC (x); | |
1297 | if (CONSTANT_P (last_value) | |
1298 | || ((GET_CODE (last_value) == REG | |
1299 | || GET_CODE (last_value) == SUBREG) | |
1300 | && ! reg_set_between_p (last_value, | |
ce9c8df2 | 1301 | insn, orig_insn))) |
91b2d119 | 1302 | return last_value; |
2c88418c RS |
1303 | else |
1304 | return 0; | |
1305 | } | |
1306 | } | |
1307 | ||
1308 | return 0; | |
1309 | } | |
1310 | \f | |
2c88418c RS |
1311 | /* Call FUN on each register or MEM that is stored into or clobbered by X. |
1312 | (X would be the pattern of an insn). | |
1313 | FUN receives two arguments: | |
1314 | the REG, MEM, CC0 or PC being stored in or clobbered, | |
1315 | the SET or CLOBBER rtx that does the store. | |
1316 | ||
1317 | If the item being stored in or clobbered is a SUBREG of a hard register, | |
1318 | the SUBREG will be passed. */ | |
1319 | ||
1320 | void | |
84832317 | 1321 | note_stores (x, fun, data) |
2c88418c | 1322 | register rtx x; |
cdadb1dd | 1323 | void (*fun) PARAMS ((rtx, rtx, void *)); |
84832317 | 1324 | void *data; |
2c88418c | 1325 | { |
90d036a0 RK |
1326 | int i; |
1327 | ||
0c99ec5c RH |
1328 | if (GET_CODE (x) == COND_EXEC) |
1329 | x = COND_EXEC_CODE (x); | |
90d036a0 | 1330 | |
0c99ec5c | 1331 | if (GET_CODE (x) == SET || GET_CODE (x) == CLOBBER) |
2c88418c RS |
1332 | { |
1333 | register rtx dest = SET_DEST (x); | |
90d036a0 | 1334 | |
2c88418c RS |
1335 | while ((GET_CODE (dest) == SUBREG |
1336 | && (GET_CODE (SUBREG_REG (dest)) != REG | |
1337 | || REGNO (SUBREG_REG (dest)) >= FIRST_PSEUDO_REGISTER)) | |
1338 | || GET_CODE (dest) == ZERO_EXTRACT | |
1339 | || GET_CODE (dest) == SIGN_EXTRACT | |
1340 | || GET_CODE (dest) == STRICT_LOW_PART) | |
1341 | dest = XEXP (dest, 0); | |
86465af7 | 1342 | |
7193d1dc RK |
1343 | /* If we have a PARALLEL, SET_DEST is a list of EXPR_LIST expressions, |
1344 | each of whose first operand is a register. We can't know what | |
1345 | precisely is being set in these cases, so make up a CLOBBER to pass | |
1346 | to the function. */ | |
1347 | if (GET_CODE (dest) == PARALLEL) | |
1348 | { | |
1349 | for (i = XVECLEN (dest, 0) - 1; i >= 0; i--) | |
1350 | if (XEXP (XVECEXP (dest, 0, i), 0) != 0) | |
1351 | (*fun) (XEXP (XVECEXP (dest, 0, i), 0), | |
1352 | gen_rtx_CLOBBER (VOIDmode, | |
1353 | XEXP (XVECEXP (dest, 0, i), 0)), | |
1354 | data); | |
1355 | } | |
86465af7 | 1356 | else |
84832317 | 1357 | (*fun) (dest, x, data); |
2c88418c | 1358 | } |
770ae6cc | 1359 | |
90d036a0 RK |
1360 | else if (GET_CODE (x) == PARALLEL) |
1361 | for (i = XVECLEN (x, 0) - 1; i >= 0; i--) | |
1362 | note_stores (XVECEXP (x, 0, i), fun, data); | |
2c88418c RS |
1363 | } |
1364 | \f | |
e2373f95 RK |
1365 | /* Like notes_stores, but call FUN for each expression that is being |
1366 | referenced in PBODY, a pointer to the PATTERN of an insn. We only call | |
1367 | FUN for each expression, not any interior subexpressions. FUN receives a | |
1368 | pointer to the expression and the DATA passed to this function. | |
1369 | ||
1370 | Note that this is not quite the same test as that done in reg_referenced_p | |
1371 | since that considers something as being referenced if it is being | |
1372 | partially set, while we do not. */ | |
1373 | ||
1374 | void | |
1375 | note_uses (pbody, fun, data) | |
1376 | rtx *pbody; | |
1377 | void (*fun) PARAMS ((rtx *, void *)); | |
1378 | void *data; | |
1379 | { | |
1380 | rtx body = *pbody; | |
1381 | int i; | |
1382 | ||
1383 | switch (GET_CODE (body)) | |
1384 | { | |
1385 | case COND_EXEC: | |
1386 | (*fun) (&COND_EXEC_TEST (body), data); | |
1387 | note_uses (&COND_EXEC_CODE (body), fun, data); | |
1388 | return; | |
1389 | ||
1390 | case PARALLEL: | |
1391 | for (i = XVECLEN (body, 0) - 1; i >= 0; i--) | |
1392 | note_uses (&XVECEXP (body, 0, i), fun, data); | |
1393 | return; | |
1394 | ||
1395 | case USE: | |
1396 | (*fun) (&XEXP (body, 0), data); | |
1397 | return; | |
1398 | ||
1399 | case ASM_OPERANDS: | |
1400 | for (i = ASM_OPERANDS_INPUT_LENGTH (body) - 1; i >= 0; i--) | |
1401 | (*fun) (&ASM_OPERANDS_INPUT (body, i), data); | |
1402 | return; | |
1403 | ||
1404 | case TRAP_IF: | |
1405 | (*fun) (&TRAP_CONDITION (body), data); | |
1406 | return; | |
1407 | ||
1408 | case UNSPEC: | |
1409 | case UNSPEC_VOLATILE: | |
1410 | for (i = XVECLEN (body, 0) - 1; i >= 0; i--) | |
1411 | (*fun) (&XVECEXP (body, 0, i), data); | |
1412 | return; | |
1413 | ||
1414 | case CLOBBER: | |
1415 | if (GET_CODE (XEXP (body, 0)) == MEM) | |
1416 | (*fun) (&XEXP (XEXP (body, 0), 0), data); | |
1417 | return; | |
1418 | ||
1419 | case SET: | |
1420 | { | |
1421 | rtx dest = SET_DEST (body); | |
1422 | ||
1423 | /* For sets we replace everything in source plus registers in memory | |
1424 | expression in store and operands of a ZERO_EXTRACT. */ | |
1425 | (*fun) (&SET_SRC (body), data); | |
1426 | ||
1427 | if (GET_CODE (dest) == ZERO_EXTRACT) | |
1428 | { | |
1429 | (*fun) (&XEXP (dest, 1), data); | |
1430 | (*fun) (&XEXP (dest, 2), data); | |
1431 | } | |
1432 | ||
1433 | while (GET_CODE (dest) == SUBREG || GET_CODE (dest) == STRICT_LOW_PART) | |
1434 | dest = XEXP (dest, 0); | |
1435 | ||
1436 | if (GET_CODE (dest) == MEM) | |
1437 | (*fun) (&XEXP (dest, 0), data); | |
1438 | } | |
1439 | return; | |
1440 | ||
1441 | default: | |
1442 | /* All the other possibilities never store. */ | |
1443 | (*fun) (pbody, data); | |
1444 | return; | |
1445 | } | |
1446 | } | |
1447 | \f | |
2c88418c RS |
1448 | /* Return nonzero if X's old contents don't survive after INSN. |
1449 | This will be true if X is (cc0) or if X is a register and | |
1450 | X dies in INSN or because INSN entirely sets X. | |
1451 | ||
1452 | "Entirely set" means set directly and not through a SUBREG, | |
1453 | ZERO_EXTRACT or SIGN_EXTRACT, so no trace of the old contents remains. | |
1454 | Likewise, REG_INC does not count. | |
1455 | ||
1456 | REG may be a hard or pseudo reg. Renumbering is not taken into account, | |
1457 | but for this use that makes no difference, since regs don't overlap | |
1458 | during their lifetimes. Therefore, this function may be used | |
1459 | at any time after deaths have been computed (in flow.c). | |
1460 | ||
1461 | If REG is a hard reg that occupies multiple machine registers, this | |
1462 | function will only return 1 if each of those registers will be replaced | |
1463 | by INSN. */ | |
1464 | ||
1465 | int | |
1466 | dead_or_set_p (insn, x) | |
1467 | rtx insn; | |
1468 | rtx x; | |
1469 | { | |
770ae6cc RK |
1470 | unsigned int regno, last_regno; |
1471 | unsigned int i; | |
2c88418c RS |
1472 | |
1473 | /* Can't use cc0_rtx below since this file is used by genattrtab.c. */ | |
1474 | if (GET_CODE (x) == CC0) | |
1475 | return 1; | |
1476 | ||
1477 | if (GET_CODE (x) != REG) | |
1478 | abort (); | |
1479 | ||
1480 | regno = REGNO (x); | |
1481 | last_regno = (regno >= FIRST_PSEUDO_REGISTER ? regno | |
1482 | : regno + HARD_REGNO_NREGS (regno, GET_MODE (x)) - 1); | |
1483 | ||
1484 | for (i = regno; i <= last_regno; i++) | |
1485 | if (! dead_or_set_regno_p (insn, i)) | |
1486 | return 0; | |
1487 | ||
1488 | return 1; | |
1489 | } | |
1490 | ||
1491 | /* Utility function for dead_or_set_p to check an individual register. Also | |
1492 | called from flow.c. */ | |
1493 | ||
1494 | int | |
1495 | dead_or_set_regno_p (insn, test_regno) | |
1496 | rtx insn; | |
770ae6cc | 1497 | unsigned int test_regno; |
2c88418c | 1498 | { |
770ae6cc | 1499 | unsigned int regno, endregno; |
8c8de5fc | 1500 | rtx pattern; |
2c88418c | 1501 | |
0a2287bf RH |
1502 | /* See if there is a death note for something that includes TEST_REGNO. */ |
1503 | if (find_regno_note (insn, REG_DEAD, test_regno)) | |
1504 | return 1; | |
2c88418c | 1505 | |
8f3e7a26 RK |
1506 | if (GET_CODE (insn) == CALL_INSN |
1507 | && find_regno_fusage (insn, CLOBBER, test_regno)) | |
1508 | return 1; | |
1509 | ||
0c99ec5c RH |
1510 | pattern = PATTERN (insn); |
1511 | ||
1512 | if (GET_CODE (pattern) == COND_EXEC) | |
1513 | pattern = COND_EXEC_CODE (pattern); | |
1514 | ||
1515 | if (GET_CODE (pattern) == SET) | |
2c88418c RS |
1516 | { |
1517 | rtx dest = SET_DEST (PATTERN (insn)); | |
1518 | ||
1519 | /* A value is totally replaced if it is the destination or the | |
1520 | destination is a SUBREG of REGNO that does not change the number of | |
1521 | words in it. */ | |
6764d250 | 1522 | if (GET_CODE (dest) == SUBREG |
2c88418c RS |
1523 | && (((GET_MODE_SIZE (GET_MODE (dest)) |
1524 | + UNITS_PER_WORD - 1) / UNITS_PER_WORD) | |
1525 | == ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (dest))) | |
1526 | + UNITS_PER_WORD - 1) / UNITS_PER_WORD))) | |
1527 | dest = SUBREG_REG (dest); | |
1528 | ||
1529 | if (GET_CODE (dest) != REG) | |
1530 | return 0; | |
1531 | ||
1532 | regno = REGNO (dest); | |
1533 | endregno = (regno >= FIRST_PSEUDO_REGISTER ? regno + 1 | |
1534 | : regno + HARD_REGNO_NREGS (regno, GET_MODE (dest))); | |
1535 | ||
1536 | return (test_regno >= regno && test_regno < endregno); | |
1537 | } | |
0c99ec5c | 1538 | else if (GET_CODE (pattern) == PARALLEL) |
2c88418c RS |
1539 | { |
1540 | register int i; | |
1541 | ||
0c99ec5c | 1542 | for (i = XVECLEN (pattern, 0) - 1; i >= 0; i--) |
2c88418c | 1543 | { |
0c99ec5c RH |
1544 | rtx body = XVECEXP (pattern, 0, i); |
1545 | ||
1546 | if (GET_CODE (body) == COND_EXEC) | |
1547 | body = COND_EXEC_CODE (body); | |
2c88418c RS |
1548 | |
1549 | if (GET_CODE (body) == SET || GET_CODE (body) == CLOBBER) | |
1550 | { | |
1551 | rtx dest = SET_DEST (body); | |
1552 | ||
1553 | if (GET_CODE (dest) == SUBREG | |
1554 | && (((GET_MODE_SIZE (GET_MODE (dest)) | |
1555 | + UNITS_PER_WORD - 1) / UNITS_PER_WORD) | |
1556 | == ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (dest))) | |
1557 | + UNITS_PER_WORD - 1) / UNITS_PER_WORD))) | |
1558 | dest = SUBREG_REG (dest); | |
1559 | ||
1560 | if (GET_CODE (dest) != REG) | |
1561 | continue; | |
1562 | ||
1563 | regno = REGNO (dest); | |
1564 | endregno = (regno >= FIRST_PSEUDO_REGISTER ? regno + 1 | |
1565 | : regno + HARD_REGNO_NREGS (regno, GET_MODE (dest))); | |
1566 | ||
1567 | if (test_regno >= regno && test_regno < endregno) | |
1568 | return 1; | |
1569 | } | |
1570 | } | |
1571 | } | |
1572 | ||
1573 | return 0; | |
1574 | } | |
1575 | ||
1576 | /* Return the reg-note of kind KIND in insn INSN, if there is one. | |
1577 | If DATUM is nonzero, look for one whose datum is DATUM. */ | |
1578 | ||
1579 | rtx | |
1580 | find_reg_note (insn, kind, datum) | |
1581 | rtx insn; | |
1582 | enum reg_note kind; | |
1583 | rtx datum; | |
1584 | { | |
1585 | register rtx link; | |
1586 | ||
ae78d276 | 1587 | /* Ignore anything that is not an INSN, JUMP_INSN or CALL_INSN. */ |
2c3c49de | 1588 | if (! INSN_P (insn)) |
ae78d276 MM |
1589 | return 0; |
1590 | ||
2c88418c RS |
1591 | for (link = REG_NOTES (insn); link; link = XEXP (link, 1)) |
1592 | if (REG_NOTE_KIND (link) == kind | |
1593 | && (datum == 0 || datum == XEXP (link, 0))) | |
1594 | return link; | |
1595 | return 0; | |
1596 | } | |
1597 | ||
1598 | /* Return the reg-note of kind KIND in insn INSN which applies to register | |
99309f3b RK |
1599 | number REGNO, if any. Return 0 if there is no such reg-note. Note that |
1600 | the REGNO of this NOTE need not be REGNO if REGNO is a hard register; | |
1601 | it might be the case that the note overlaps REGNO. */ | |
2c88418c RS |
1602 | |
1603 | rtx | |
1604 | find_regno_note (insn, kind, regno) | |
1605 | rtx insn; | |
1606 | enum reg_note kind; | |
770ae6cc | 1607 | unsigned int regno; |
2c88418c RS |
1608 | { |
1609 | register rtx link; | |
1610 | ||
ae78d276 | 1611 | /* Ignore anything that is not an INSN, JUMP_INSN or CALL_INSN. */ |
2c3c49de | 1612 | if (! INSN_P (insn)) |
ae78d276 MM |
1613 | return 0; |
1614 | ||
2c88418c RS |
1615 | for (link = REG_NOTES (insn); link; link = XEXP (link, 1)) |
1616 | if (REG_NOTE_KIND (link) == kind | |
1617 | /* Verify that it is a register, so that scratch and MEM won't cause a | |
1618 | problem here. */ | |
1619 | && GET_CODE (XEXP (link, 0)) == REG | |
99309f3b RK |
1620 | && REGNO (XEXP (link, 0)) <= regno |
1621 | && ((REGNO (XEXP (link, 0)) | |
1622 | + (REGNO (XEXP (link, 0)) >= FIRST_PSEUDO_REGISTER ? 1 | |
1623 | : HARD_REGNO_NREGS (REGNO (XEXP (link, 0)), | |
1624 | GET_MODE (XEXP (link, 0))))) | |
1625 | > regno)) | |
2c88418c RS |
1626 | return link; |
1627 | return 0; | |
1628 | } | |
8f3e7a26 | 1629 | |
d9c695ff RK |
1630 | /* Return a REG_EQUIV or REG_EQUAL note if insn has only a single set and |
1631 | has such a note. */ | |
1632 | ||
1633 | rtx | |
1634 | find_reg_equal_equiv_note (insn) | |
1635 | rtx insn; | |
1636 | { | |
1637 | rtx note; | |
1638 | ||
1639 | if (single_set (insn) == 0) | |
1640 | return 0; | |
1641 | else if ((note = find_reg_note (insn, REG_EQUIV, NULL_RTX)) != 0) | |
1642 | return note; | |
1643 | else | |
1644 | return find_reg_note (insn, REG_EQUAL, NULL_RTX); | |
1645 | } | |
1646 | ||
8f3e7a26 RK |
1647 | /* Return true if DATUM, or any overlap of DATUM, of kind CODE is found |
1648 | in the CALL_INSN_FUNCTION_USAGE information of INSN. */ | |
1649 | ||
1650 | int | |
1651 | find_reg_fusage (insn, code, datum) | |
1652 | rtx insn; | |
1653 | enum rtx_code code; | |
1654 | rtx datum; | |
1655 | { | |
1656 | /* If it's not a CALL_INSN, it can't possibly have a | |
1657 | CALL_INSN_FUNCTION_USAGE field, so don't bother checking. */ | |
1658 | if (GET_CODE (insn) != CALL_INSN) | |
1659 | return 0; | |
1660 | ||
1661 | if (! datum) | |
1662 | abort(); | |
1663 | ||
1664 | if (GET_CODE (datum) != REG) | |
1665 | { | |
1666 | register rtx link; | |
1667 | ||
1668 | for (link = CALL_INSN_FUNCTION_USAGE (insn); | |
1669 | link; | |
1670 | link = XEXP (link, 1)) | |
1671 | if (GET_CODE (XEXP (link, 0)) == code | |
1672 | && rtx_equal_p (datum, SET_DEST (XEXP (link, 0)))) | |
1673 | return 1; | |
1674 | } | |
1675 | else | |
1676 | { | |
770ae6cc | 1677 | unsigned int regno = REGNO (datum); |
8f3e7a26 RK |
1678 | |
1679 | /* CALL_INSN_FUNCTION_USAGE information cannot contain references | |
1680 | to pseudo registers, so don't bother checking. */ | |
1681 | ||
1682 | if (regno < FIRST_PSEUDO_REGISTER) | |
1683 | { | |
770ae6cc RK |
1684 | unsigned int end_regno |
1685 | = regno + HARD_REGNO_NREGS (regno, GET_MODE (datum)); | |
1686 | unsigned int i; | |
8f3e7a26 RK |
1687 | |
1688 | for (i = regno; i < end_regno; i++) | |
1689 | if (find_regno_fusage (insn, code, i)) | |
1690 | return 1; | |
1691 | } | |
1692 | } | |
1693 | ||
1694 | return 0; | |
1695 | } | |
1696 | ||
1697 | /* Return true if REGNO, or any overlap of REGNO, of kind CODE is found | |
1698 | in the CALL_INSN_FUNCTION_USAGE information of INSN. */ | |
1699 | ||
1700 | int | |
1701 | find_regno_fusage (insn, code, regno) | |
1702 | rtx insn; | |
1703 | enum rtx_code code; | |
770ae6cc | 1704 | unsigned int regno; |
8f3e7a26 RK |
1705 | { |
1706 | register rtx link; | |
1707 | ||
1708 | /* CALL_INSN_FUNCTION_USAGE information cannot contain references | |
1709 | to pseudo registers, so don't bother checking. */ | |
1710 | ||
1711 | if (regno >= FIRST_PSEUDO_REGISTER | |
1712 | || GET_CODE (insn) != CALL_INSN ) | |
1713 | return 0; | |
1714 | ||
1715 | for (link = CALL_INSN_FUNCTION_USAGE (insn); link; link = XEXP (link, 1)) | |
83ab3839 | 1716 | { |
770ae6cc RK |
1717 | unsigned int regnote; |
1718 | rtx op, reg; | |
83ab3839 RH |
1719 | |
1720 | if (GET_CODE (op = XEXP (link, 0)) == code | |
1721 | && GET_CODE (reg = XEXP (op, 0)) == REG | |
1722 | && (regnote = REGNO (reg)) <= regno | |
1723 | && regnote + HARD_REGNO_NREGS (regnote, GET_MODE (reg)) > regno) | |
1724 | return 1; | |
1725 | } | |
8f3e7a26 RK |
1726 | |
1727 | return 0; | |
1728 | } | |
2c88418c RS |
1729 | \f |
1730 | /* Remove register note NOTE from the REG_NOTES of INSN. */ | |
1731 | ||
1732 | void | |
1733 | remove_note (insn, note) | |
2c88418c | 1734 | register rtx insn; |
49c3bb12 | 1735 | register rtx note; |
2c88418c RS |
1736 | { |
1737 | register rtx link; | |
1738 | ||
49c3bb12 RH |
1739 | if (note == NULL_RTX) |
1740 | return; | |
1741 | ||
2c88418c RS |
1742 | if (REG_NOTES (insn) == note) |
1743 | { | |
1744 | REG_NOTES (insn) = XEXP (note, 1); | |
1745 | return; | |
1746 | } | |
1747 | ||
1748 | for (link = REG_NOTES (insn); link; link = XEXP (link, 1)) | |
1749 | if (XEXP (link, 1) == note) | |
1750 | { | |
1751 | XEXP (link, 1) = XEXP (note, 1); | |
1752 | return; | |
1753 | } | |
1754 | ||
1755 | abort (); | |
1756 | } | |
55a98783 | 1757 | |
dd248abd RK |
1758 | /* Search LISTP (an EXPR_LIST) for an entry whose first operand is NODE and |
1759 | remove that entry from the list if it is found. | |
55a98783 | 1760 | |
dd248abd | 1761 | A simple equality test is used to determine if NODE matches. */ |
55a98783 JL |
1762 | |
1763 | void | |
1764 | remove_node_from_expr_list (node, listp) | |
1765 | rtx node; | |
1766 | rtx *listp; | |
1767 | { | |
1768 | rtx temp = *listp; | |
1769 | rtx prev = NULL_RTX; | |
1770 | ||
1771 | while (temp) | |
1772 | { | |
1773 | if (node == XEXP (temp, 0)) | |
1774 | { | |
1775 | /* Splice the node out of the list. */ | |
1776 | if (prev) | |
1777 | XEXP (prev, 1) = XEXP (temp, 1); | |
1778 | else | |
1779 | *listp = XEXP (temp, 1); | |
1780 | ||
1781 | return; | |
1782 | } | |
dd248abd RK |
1783 | |
1784 | prev = temp; | |
55a98783 JL |
1785 | temp = XEXP (temp, 1); |
1786 | } | |
1787 | } | |
2c88418c | 1788 | \f |
2b067faf RS |
1789 | /* Nonzero if X contains any volatile instructions. These are instructions |
1790 | which may cause unpredictable machine state instructions, and thus no | |
1791 | instructions should be moved or combined across them. This includes | |
1792 | only volatile asms and UNSPEC_VOLATILE instructions. */ | |
1793 | ||
1794 | int | |
1795 | volatile_insn_p (x) | |
1796 | rtx x; | |
1797 | { | |
1798 | register RTX_CODE code; | |
1799 | ||
1800 | code = GET_CODE (x); | |
1801 | switch (code) | |
1802 | { | |
1803 | case LABEL_REF: | |
1804 | case SYMBOL_REF: | |
1805 | case CONST_INT: | |
1806 | case CONST: | |
1807 | case CONST_DOUBLE: | |
1808 | case CC0: | |
1809 | case PC: | |
1810 | case REG: | |
1811 | case SCRATCH: | |
1812 | case CLOBBER: | |
1813 | case ASM_INPUT: | |
1814 | case ADDR_VEC: | |
1815 | case ADDR_DIFF_VEC: | |
1816 | case CALL: | |
1817 | case MEM: | |
1818 | return 0; | |
1819 | ||
1820 | case UNSPEC_VOLATILE: | |
1821 | /* case TRAP_IF: This isn't clear yet. */ | |
1822 | return 1; | |
1823 | ||
1824 | case ASM_OPERANDS: | |
1825 | if (MEM_VOLATILE_P (x)) | |
1826 | return 1; | |
e9a25f70 JL |
1827 | |
1828 | default: | |
1829 | break; | |
2b067faf RS |
1830 | } |
1831 | ||
1832 | /* Recursively scan the operands of this expression. */ | |
1833 | ||
1834 | { | |
6f7d635c | 1835 | register const char *fmt = GET_RTX_FORMAT (code); |
2b067faf RS |
1836 | register int i; |
1837 | ||
1838 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
1839 | { | |
1840 | if (fmt[i] == 'e') | |
1841 | { | |
31001f72 | 1842 | if (volatile_insn_p (XEXP (x, i))) |
2b067faf RS |
1843 | return 1; |
1844 | } | |
d4757e6a | 1845 | else if (fmt[i] == 'E') |
2b067faf RS |
1846 | { |
1847 | register int j; | |
1848 | for (j = 0; j < XVECLEN (x, i); j++) | |
31001f72 | 1849 | if (volatile_insn_p (XVECEXP (x, i, j))) |
2b067faf RS |
1850 | return 1; |
1851 | } | |
1852 | } | |
1853 | } | |
1854 | return 0; | |
1855 | } | |
1856 | ||
2c88418c | 1857 | /* Nonzero if X contains any volatile memory references |
2ac4fed0 | 1858 | UNSPEC_VOLATILE operations or volatile ASM_OPERANDS expressions. */ |
2c88418c RS |
1859 | |
1860 | int | |
1861 | volatile_refs_p (x) | |
1862 | rtx x; | |
1863 | { | |
1864 | register RTX_CODE code; | |
1865 | ||
1866 | code = GET_CODE (x); | |
1867 | switch (code) | |
1868 | { | |
1869 | case LABEL_REF: | |
1870 | case SYMBOL_REF: | |
1871 | case CONST_INT: | |
1872 | case CONST: | |
1873 | case CONST_DOUBLE: | |
1874 | case CC0: | |
1875 | case PC: | |
1876 | case REG: | |
1877 | case SCRATCH: | |
1878 | case CLOBBER: | |
1879 | case ASM_INPUT: | |
1880 | case ADDR_VEC: | |
1881 | case ADDR_DIFF_VEC: | |
1882 | return 0; | |
1883 | ||
1884 | case CALL: | |
2ac4fed0 | 1885 | case UNSPEC_VOLATILE: |
2c88418c RS |
1886 | /* case TRAP_IF: This isn't clear yet. */ |
1887 | return 1; | |
1888 | ||
1889 | case MEM: | |
1890 | case ASM_OPERANDS: | |
1891 | if (MEM_VOLATILE_P (x)) | |
1892 | return 1; | |
e9a25f70 JL |
1893 | |
1894 | default: | |
1895 | break; | |
2c88418c RS |
1896 | } |
1897 | ||
1898 | /* Recursively scan the operands of this expression. */ | |
1899 | ||
1900 | { | |
6f7d635c | 1901 | register const char *fmt = GET_RTX_FORMAT (code); |
2c88418c RS |
1902 | register int i; |
1903 | ||
1904 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
1905 | { | |
1906 | if (fmt[i] == 'e') | |
1907 | { | |
1908 | if (volatile_refs_p (XEXP (x, i))) | |
1909 | return 1; | |
1910 | } | |
d4757e6a | 1911 | else if (fmt[i] == 'E') |
2c88418c RS |
1912 | { |
1913 | register int j; | |
1914 | for (j = 0; j < XVECLEN (x, i); j++) | |
1915 | if (volatile_refs_p (XVECEXP (x, i, j))) | |
1916 | return 1; | |
1917 | } | |
1918 | } | |
1919 | } | |
1920 | return 0; | |
1921 | } | |
1922 | ||
1923 | /* Similar to above, except that it also rejects register pre- and post- | |
1924 | incrementing. */ | |
1925 | ||
1926 | int | |
1927 | side_effects_p (x) | |
1928 | rtx x; | |
1929 | { | |
1930 | register RTX_CODE code; | |
1931 | ||
1932 | code = GET_CODE (x); | |
1933 | switch (code) | |
1934 | { | |
1935 | case LABEL_REF: | |
1936 | case SYMBOL_REF: | |
1937 | case CONST_INT: | |
1938 | case CONST: | |
1939 | case CONST_DOUBLE: | |
1940 | case CC0: | |
1941 | case PC: | |
1942 | case REG: | |
1943 | case SCRATCH: | |
1944 | case ASM_INPUT: | |
1945 | case ADDR_VEC: | |
1946 | case ADDR_DIFF_VEC: | |
1947 | return 0; | |
1948 | ||
1949 | case CLOBBER: | |
1950 | /* Reject CLOBBER with a non-VOID mode. These are made by combine.c | |
1951 | when some combination can't be done. If we see one, don't think | |
1952 | that we can simplify the expression. */ | |
1953 | return (GET_MODE (x) != VOIDmode); | |
1954 | ||
1955 | case PRE_INC: | |
1956 | case PRE_DEC: | |
1957 | case POST_INC: | |
1958 | case POST_DEC: | |
1fb9c5cd MH |
1959 | case PRE_MODIFY: |
1960 | case POST_MODIFY: | |
2c88418c | 1961 | case CALL: |
2ac4fed0 | 1962 | case UNSPEC_VOLATILE: |
2c88418c RS |
1963 | /* case TRAP_IF: This isn't clear yet. */ |
1964 | return 1; | |
1965 | ||
1966 | case MEM: | |
1967 | case ASM_OPERANDS: | |
1968 | if (MEM_VOLATILE_P (x)) | |
1969 | return 1; | |
e9a25f70 JL |
1970 | |
1971 | default: | |
1972 | break; | |
2c88418c RS |
1973 | } |
1974 | ||
1975 | /* Recursively scan the operands of this expression. */ | |
1976 | ||
1977 | { | |
6f7d635c | 1978 | register const char *fmt = GET_RTX_FORMAT (code); |
2c88418c RS |
1979 | register int i; |
1980 | ||
1981 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
1982 | { | |
1983 | if (fmt[i] == 'e') | |
1984 | { | |
1985 | if (side_effects_p (XEXP (x, i))) | |
1986 | return 1; | |
1987 | } | |
d4757e6a | 1988 | else if (fmt[i] == 'E') |
2c88418c RS |
1989 | { |
1990 | register int j; | |
1991 | for (j = 0; j < XVECLEN (x, i); j++) | |
1992 | if (side_effects_p (XVECEXP (x, i, j))) | |
1993 | return 1; | |
1994 | } | |
1995 | } | |
1996 | } | |
1997 | return 0; | |
1998 | } | |
1999 | \f | |
2000 | /* Return nonzero if evaluating rtx X might cause a trap. */ | |
2001 | ||
2002 | int | |
2003 | may_trap_p (x) | |
2004 | rtx x; | |
2005 | { | |
2006 | int i; | |
2007 | enum rtx_code code; | |
6f7d635c | 2008 | const char *fmt; |
2c88418c RS |
2009 | |
2010 | if (x == 0) | |
2011 | return 0; | |
2012 | code = GET_CODE (x); | |
2013 | switch (code) | |
2014 | { | |
2015 | /* Handle these cases quickly. */ | |
2016 | case CONST_INT: | |
2017 | case CONST_DOUBLE: | |
2018 | case SYMBOL_REF: | |
2019 | case LABEL_REF: | |
2020 | case CONST: | |
2021 | case PC: | |
2022 | case CC0: | |
2023 | case REG: | |
2024 | case SCRATCH: | |
2025 | return 0; | |
2026 | ||
22aa60a1 | 2027 | case ASM_INPUT: |
2ac4fed0 | 2028 | case UNSPEC_VOLATILE: |
2c88418c RS |
2029 | case TRAP_IF: |
2030 | return 1; | |
2031 | ||
22aa60a1 RH |
2032 | case ASM_OPERANDS: |
2033 | return MEM_VOLATILE_P (x); | |
2034 | ||
2c88418c RS |
2035 | /* Memory ref can trap unless it's a static var or a stack slot. */ |
2036 | case MEM: | |
2037 | return rtx_addr_can_trap_p (XEXP (x, 0)); | |
2038 | ||
2039 | /* Division by a non-constant might trap. */ | |
2040 | case DIV: | |
2041 | case MOD: | |
2042 | case UDIV: | |
2043 | case UMOD: | |
e9a25f70 JL |
2044 | if (! CONSTANT_P (XEXP (x, 1)) |
2045 | || GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT) | |
2c88418c RS |
2046 | return 1; |
2047 | /* This was const0_rtx, but by not using that, | |
2048 | we can link this file into other programs. */ | |
2049 | if (GET_CODE (XEXP (x, 1)) == CONST_INT && INTVAL (XEXP (x, 1)) == 0) | |
2050 | return 1; | |
e9a25f70 JL |
2051 | break; |
2052 | ||
b278301b RK |
2053 | case EXPR_LIST: |
2054 | /* An EXPR_LIST is used to represent a function call. This | |
2055 | certainly may trap. */ | |
2056 | return 1; | |
e9a25f70 | 2057 | |
734508ea JW |
2058 | case GE: |
2059 | case GT: | |
2060 | case LE: | |
2061 | case LT: | |
55143861 | 2062 | case COMPARE: |
734508ea JW |
2063 | /* Some floating point comparisons may trap. */ |
2064 | /* ??? There is no machine independent way to check for tests that trap | |
2065 | when COMPARE is used, though many targets do make this distinction. | |
2066 | For instance, sparc uses CCFPE for compares which generate exceptions | |
2067 | and CCFP for compares which do not generate exceptions. */ | |
55143861 JJ |
2068 | if (GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT) |
2069 | return 1; | |
2070 | /* But often the compare has some CC mode, so check operand | |
2071 | modes as well. */ | |
2072 | if (GET_MODE_CLASS (GET_MODE (XEXP (x, 0))) == MODE_FLOAT | |
2073 | || GET_MODE_CLASS (GET_MODE (XEXP (x, 1))) == MODE_FLOAT) | |
2074 | return 1; | |
2075 | break; | |
2076 | ||
05cc23e8 RH |
2077 | case NEG: |
2078 | case ABS: | |
2079 | /* These operations don't trap even with floating point. */ | |
2080 | break; | |
2081 | ||
2c88418c RS |
2082 | default: |
2083 | /* Any floating arithmetic may trap. */ | |
2084 | if (GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT) | |
2085 | return 1; | |
2086 | } | |
2087 | ||
2088 | fmt = GET_RTX_FORMAT (code); | |
2089 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2090 | { | |
2091 | if (fmt[i] == 'e') | |
2092 | { | |
2093 | if (may_trap_p (XEXP (x, i))) | |
2094 | return 1; | |
2095 | } | |
2096 | else if (fmt[i] == 'E') | |
2097 | { | |
2098 | register int j; | |
2099 | for (j = 0; j < XVECLEN (x, i); j++) | |
2100 | if (may_trap_p (XVECEXP (x, i, j))) | |
2101 | return 1; | |
2102 | } | |
2103 | } | |
2104 | return 0; | |
2105 | } | |
2106 | \f | |
2107 | /* Return nonzero if X contains a comparison that is not either EQ or NE, | |
2108 | i.e., an inequality. */ | |
2109 | ||
2110 | int | |
2111 | inequality_comparisons_p (x) | |
2112 | rtx x; | |
2113 | { | |
6f7d635c | 2114 | register const char *fmt; |
2c88418c RS |
2115 | register int len, i; |
2116 | register enum rtx_code code = GET_CODE (x); | |
2117 | ||
2118 | switch (code) | |
2119 | { | |
2120 | case REG: | |
2121 | case SCRATCH: | |
2122 | case PC: | |
2123 | case CC0: | |
2124 | case CONST_INT: | |
2125 | case CONST_DOUBLE: | |
2126 | case CONST: | |
2127 | case LABEL_REF: | |
2128 | case SYMBOL_REF: | |
2129 | return 0; | |
2130 | ||
2131 | case LT: | |
2132 | case LTU: | |
2133 | case GT: | |
2134 | case GTU: | |
2135 | case LE: | |
2136 | case LEU: | |
2137 | case GE: | |
2138 | case GEU: | |
2139 | return 1; | |
e9a25f70 JL |
2140 | |
2141 | default: | |
2142 | break; | |
2c88418c RS |
2143 | } |
2144 | ||
2145 | len = GET_RTX_LENGTH (code); | |
2146 | fmt = GET_RTX_FORMAT (code); | |
2147 | ||
2148 | for (i = 0; i < len; i++) | |
2149 | { | |
2150 | if (fmt[i] == 'e') | |
2151 | { | |
2152 | if (inequality_comparisons_p (XEXP (x, i))) | |
2153 | return 1; | |
2154 | } | |
2155 | else if (fmt[i] == 'E') | |
2156 | { | |
2157 | register int j; | |
2158 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) | |
2159 | if (inequality_comparisons_p (XVECEXP (x, i, j))) | |
2160 | return 1; | |
2161 | } | |
2162 | } | |
2163 | ||
2164 | return 0; | |
2165 | } | |
2166 | \f | |
1ed0205e VM |
2167 | /* Replace any occurrence of FROM in X with TO. The function does |
2168 | not enter into CONST_DOUBLE for the replace. | |
2c88418c RS |
2169 | |
2170 | Note that copying is not done so X must not be shared unless all copies | |
2171 | are to be modified. */ | |
2172 | ||
2173 | rtx | |
2174 | replace_rtx (x, from, to) | |
2175 | rtx x, from, to; | |
2176 | { | |
2177 | register int i, j; | |
6f7d635c | 2178 | register const char *fmt; |
2c88418c | 2179 | |
1ed0205e VM |
2180 | /* The following prevents loops occurrence when we change MEM in |
2181 | CONST_DOUBLE onto the same CONST_DOUBLE. */ | |
2182 | if (x != 0 && GET_CODE (x) == CONST_DOUBLE) | |
2183 | return x; | |
2184 | ||
2c88418c RS |
2185 | if (x == from) |
2186 | return to; | |
2187 | ||
2188 | /* Allow this function to make replacements in EXPR_LISTs. */ | |
2189 | if (x == 0) | |
2190 | return 0; | |
2191 | ||
2192 | fmt = GET_RTX_FORMAT (GET_CODE (x)); | |
2193 | for (i = GET_RTX_LENGTH (GET_CODE (x)) - 1; i >= 0; i--) | |
2194 | { | |
2195 | if (fmt[i] == 'e') | |
2196 | XEXP (x, i) = replace_rtx (XEXP (x, i), from, to); | |
2197 | else if (fmt[i] == 'E') | |
2198 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) | |
2199 | XVECEXP (x, i, j) = replace_rtx (XVECEXP (x, i, j), from, to); | |
2200 | } | |
2201 | ||
2202 | return x; | |
2203 | } | |
2204 | \f | |
2205 | /* Throughout the rtx X, replace many registers according to REG_MAP. | |
2206 | Return the replacement for X (which may be X with altered contents). | |
2207 | REG_MAP[R] is the replacement for register R, or 0 for don't replace. | |
2208 | NREGS is the length of REG_MAP; regs >= NREGS are not mapped. | |
2209 | ||
2210 | We only support REG_MAP entries of REG or SUBREG. Also, hard registers | |
2211 | should not be mapped to pseudos or vice versa since validate_change | |
2212 | is not called. | |
2213 | ||
2214 | If REPLACE_DEST is 1, replacements are also done in destinations; | |
2215 | otherwise, only sources are replaced. */ | |
2216 | ||
2217 | rtx | |
2218 | replace_regs (x, reg_map, nregs, replace_dest) | |
2219 | rtx x; | |
2220 | rtx *reg_map; | |
770ae6cc | 2221 | unsigned int nregs; |
2c88418c RS |
2222 | int replace_dest; |
2223 | { | |
2224 | register enum rtx_code code; | |
2225 | register int i; | |
6f7d635c | 2226 | register const char *fmt; |
2c88418c RS |
2227 | |
2228 | if (x == 0) | |
2229 | return x; | |
2230 | ||
2231 | code = GET_CODE (x); | |
2232 | switch (code) | |
2233 | { | |
2234 | case SCRATCH: | |
2235 | case PC: | |
2236 | case CC0: | |
2237 | case CONST_INT: | |
2238 | case CONST_DOUBLE: | |
2239 | case CONST: | |
2240 | case SYMBOL_REF: | |
2241 | case LABEL_REF: | |
2242 | return x; | |
2243 | ||
2244 | case REG: | |
2245 | /* Verify that the register has an entry before trying to access it. */ | |
2246 | if (REGNO (x) < nregs && reg_map[REGNO (x)] != 0) | |
3eb8f14c JW |
2247 | { |
2248 | /* SUBREGs can't be shared. Always return a copy to ensure that if | |
2249 | this replacement occurs more than once then each instance will | |
2250 | get distinct rtx. */ | |
2251 | if (GET_CODE (reg_map[REGNO (x)]) == SUBREG) | |
2252 | return copy_rtx (reg_map[REGNO (x)]); | |
2253 | return reg_map[REGNO (x)]; | |
2254 | } | |
2c88418c RS |
2255 | return x; |
2256 | ||
2257 | case SUBREG: | |
2258 | /* Prevent making nested SUBREGs. */ | |
2259 | if (GET_CODE (SUBREG_REG (x)) == REG && REGNO (SUBREG_REG (x)) < nregs | |
2260 | && reg_map[REGNO (SUBREG_REG (x))] != 0 | |
2261 | && GET_CODE (reg_map[REGNO (SUBREG_REG (x))]) == SUBREG) | |
2262 | { | |
2263 | rtx map_val = reg_map[REGNO (SUBREG_REG (x))]; | |
e0e08ac2 JH |
2264 | return simplify_gen_subreg (GET_MODE (x), map_val, |
2265 | GET_MODE (SUBREG_REG (x)), | |
2266 | SUBREG_BYTE (x)); | |
2c88418c RS |
2267 | } |
2268 | break; | |
2269 | ||
2270 | case SET: | |
2271 | if (replace_dest) | |
2272 | SET_DEST (x) = replace_regs (SET_DEST (x), reg_map, nregs, 0); | |
2273 | ||
2274 | else if (GET_CODE (SET_DEST (x)) == MEM | |
2275 | || GET_CODE (SET_DEST (x)) == STRICT_LOW_PART) | |
2276 | /* Even if we are not to replace destinations, replace register if it | |
2277 | is CONTAINED in destination (destination is memory or | |
2278 | STRICT_LOW_PART). */ | |
2279 | XEXP (SET_DEST (x), 0) = replace_regs (XEXP (SET_DEST (x), 0), | |
2280 | reg_map, nregs, 0); | |
2281 | else if (GET_CODE (SET_DEST (x)) == ZERO_EXTRACT) | |
2282 | /* Similarly, for ZERO_EXTRACT we replace all operands. */ | |
2283 | break; | |
2284 | ||
2285 | SET_SRC (x) = replace_regs (SET_SRC (x), reg_map, nregs, 0); | |
2286 | return x; | |
e9a25f70 JL |
2287 | |
2288 | default: | |
2289 | break; | |
2c88418c RS |
2290 | } |
2291 | ||
2292 | fmt = GET_RTX_FORMAT (code); | |
2293 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2294 | { | |
2295 | if (fmt[i] == 'e') | |
2296 | XEXP (x, i) = replace_regs (XEXP (x, i), reg_map, nregs, replace_dest); | |
d4757e6a | 2297 | else if (fmt[i] == 'E') |
2c88418c RS |
2298 | { |
2299 | register int j; | |
2300 | for (j = 0; j < XVECLEN (x, i); j++) | |
2301 | XVECEXP (x, i, j) = replace_regs (XVECEXP (x, i, j), reg_map, | |
2302 | nregs, replace_dest); | |
2303 | } | |
2304 | } | |
2305 | return x; | |
2306 | } | |
2a1777af | 2307 | |
fce7e199 RH |
2308 | /* A subroutine of computed_jump_p, return 1 if X contains a REG or MEM or |
2309 | constant that is not in the constant pool and not in the condition | |
2310 | of an IF_THEN_ELSE. */ | |
2a1777af JL |
2311 | |
2312 | static int | |
fce7e199 | 2313 | computed_jump_p_1 (x) |
2a1777af JL |
2314 | rtx x; |
2315 | { | |
2316 | enum rtx_code code = GET_CODE (x); | |
2317 | int i, j; | |
6f7d635c | 2318 | const char *fmt; |
2a1777af JL |
2319 | |
2320 | switch (code) | |
2321 | { | |
2a1777af JL |
2322 | case LABEL_REF: |
2323 | case PC: | |
2324 | return 0; | |
2325 | ||
fce7e199 RH |
2326 | case CONST: |
2327 | case CONST_INT: | |
2328 | case CONST_DOUBLE: | |
2329 | case SYMBOL_REF: | |
2a1777af JL |
2330 | case REG: |
2331 | return 1; | |
2332 | ||
2333 | case MEM: | |
2334 | return ! (GET_CODE (XEXP (x, 0)) == SYMBOL_REF | |
2335 | && CONSTANT_POOL_ADDRESS_P (XEXP (x, 0))); | |
2336 | ||
2337 | case IF_THEN_ELSE: | |
fce7e199 RH |
2338 | return (computed_jump_p_1 (XEXP (x, 1)) |
2339 | || computed_jump_p_1 (XEXP (x, 2))); | |
1d300e19 KG |
2340 | |
2341 | default: | |
2342 | break; | |
2a1777af JL |
2343 | } |
2344 | ||
2345 | fmt = GET_RTX_FORMAT (code); | |
2346 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2347 | { | |
2348 | if (fmt[i] == 'e' | |
fce7e199 | 2349 | && computed_jump_p_1 (XEXP (x, i))) |
2a1777af JL |
2350 | return 1; |
2351 | ||
d4757e6a | 2352 | else if (fmt[i] == 'E') |
2a1777af | 2353 | for (j = 0; j < XVECLEN (x, i); j++) |
fce7e199 | 2354 | if (computed_jump_p_1 (XVECEXP (x, i, j))) |
2a1777af JL |
2355 | return 1; |
2356 | } | |
2357 | ||
2358 | return 0; | |
2359 | } | |
2360 | ||
2361 | /* Return nonzero if INSN is an indirect jump (aka computed jump). | |
2362 | ||
2363 | Tablejumps and casesi insns are not considered indirect jumps; | |
4eb00163 | 2364 | we can recognize them by a (use (label_ref)). */ |
2a1777af JL |
2365 | |
2366 | int | |
2367 | computed_jump_p (insn) | |
2368 | rtx insn; | |
2369 | { | |
2370 | int i; | |
2371 | if (GET_CODE (insn) == JUMP_INSN) | |
2372 | { | |
2373 | rtx pat = PATTERN (insn); | |
2a1777af | 2374 | |
f759eb8b AO |
2375 | if (find_reg_note (insn, REG_LABEL, NULL_RTX)) |
2376 | return 0; | |
2377 | else if (GET_CODE (pat) == PARALLEL) | |
2a1777af JL |
2378 | { |
2379 | int len = XVECLEN (pat, 0); | |
2380 | int has_use_labelref = 0; | |
2381 | ||
2382 | for (i = len - 1; i >= 0; i--) | |
2383 | if (GET_CODE (XVECEXP (pat, 0, i)) == USE | |
2384 | && (GET_CODE (XEXP (XVECEXP (pat, 0, i), 0)) | |
2385 | == LABEL_REF)) | |
2386 | has_use_labelref = 1; | |
2387 | ||
2388 | if (! has_use_labelref) | |
2389 | for (i = len - 1; i >= 0; i--) | |
2390 | if (GET_CODE (XVECEXP (pat, 0, i)) == SET | |
2391 | && SET_DEST (XVECEXP (pat, 0, i)) == pc_rtx | |
fce7e199 | 2392 | && computed_jump_p_1 (SET_SRC (XVECEXP (pat, 0, i)))) |
2a1777af JL |
2393 | return 1; |
2394 | } | |
2395 | else if (GET_CODE (pat) == SET | |
2396 | && SET_DEST (pat) == pc_rtx | |
fce7e199 | 2397 | && computed_jump_p_1 (SET_SRC (pat))) |
2a1777af JL |
2398 | return 1; |
2399 | } | |
2400 | return 0; | |
2401 | } | |
ccc2d6d0 MM |
2402 | |
2403 | /* Traverse X via depth-first search, calling F for each | |
2404 | sub-expression (including X itself). F is also passed the DATA. | |
2405 | If F returns -1, do not traverse sub-expressions, but continue | |
2406 | traversing the rest of the tree. If F ever returns any other | |
2407 | non-zero value, stop the traversal, and return the value returned | |
2408 | by F. Otherwise, return 0. This function does not traverse inside | |
2409 | tree structure that contains RTX_EXPRs, or into sub-expressions | |
2410 | whose format code is `0' since it is not known whether or not those | |
2411 | codes are actually RTL. | |
2412 | ||
2413 | This routine is very general, and could (should?) be used to | |
2414 | implement many of the other routines in this file. */ | |
2415 | ||
ae0b51ef JL |
2416 | int |
2417 | for_each_rtx (x, f, data) | |
ef30399b | 2418 | rtx *x; |
ccc2d6d0 | 2419 | rtx_function f; |
ef30399b | 2420 | void *data; |
ccc2d6d0 MM |
2421 | { |
2422 | int result; | |
2423 | int length; | |
b987f237 | 2424 | const char *format; |
ccc2d6d0 MM |
2425 | int i; |
2426 | ||
2427 | /* Call F on X. */ | |
b987f237 | 2428 | result = (*f) (x, data); |
ccc2d6d0 MM |
2429 | if (result == -1) |
2430 | /* Do not traverse sub-expressions. */ | |
2431 | return 0; | |
2432 | else if (result != 0) | |
2433 | /* Stop the traversal. */ | |
2434 | return result; | |
2435 | ||
2436 | if (*x == NULL_RTX) | |
2437 | /* There are no sub-expressions. */ | |
2438 | return 0; | |
2439 | ||
2440 | length = GET_RTX_LENGTH (GET_CODE (*x)); | |
2441 | format = GET_RTX_FORMAT (GET_CODE (*x)); | |
2442 | ||
2443 | for (i = 0; i < length; ++i) | |
2444 | { | |
2445 | switch (format[i]) | |
2446 | { | |
2447 | case 'e': | |
2448 | result = for_each_rtx (&XEXP (*x, i), f, data); | |
2449 | if (result != 0) | |
2450 | return result; | |
2451 | break; | |
2452 | ||
2453 | case 'V': | |
2454 | case 'E': | |
2455 | if (XVEC (*x, i) != 0) | |
2456 | { | |
2457 | int j; | |
2458 | for (j = 0; j < XVECLEN (*x, i); ++j) | |
2459 | { | |
2460 | result = for_each_rtx (&XVECEXP (*x, i, j), f, data); | |
2461 | if (result != 0) | |
2462 | return result; | |
2463 | } | |
2464 | } | |
2465 | break; | |
2466 | ||
2467 | default: | |
2468 | /* Nothing to do. */ | |
2469 | break; | |
2470 | } | |
2471 | ||
2472 | } | |
2473 | ||
2474 | return 0; | |
2475 | } | |
3ec2b590 | 2476 | |
777b1b71 RH |
2477 | /* Searches X for any reference to REGNO, returning the rtx of the |
2478 | reference found if any. Otherwise, returns NULL_RTX. */ | |
2479 | ||
2480 | rtx | |
2481 | regno_use_in (regno, x) | |
770ae6cc | 2482 | unsigned int regno; |
777b1b71 RH |
2483 | rtx x; |
2484 | { | |
6f7d635c | 2485 | register const char *fmt; |
777b1b71 RH |
2486 | int i, j; |
2487 | rtx tem; | |
2488 | ||
2489 | if (GET_CODE (x) == REG && REGNO (x) == regno) | |
2490 | return x; | |
2491 | ||
2492 | fmt = GET_RTX_FORMAT (GET_CODE (x)); | |
2493 | for (i = GET_RTX_LENGTH (GET_CODE (x)) - 1; i >= 0; i--) | |
2494 | { | |
2495 | if (fmt[i] == 'e') | |
2496 | { | |
2497 | if ((tem = regno_use_in (regno, XEXP (x, i)))) | |
2498 | return tem; | |
2499 | } | |
2500 | else if (fmt[i] == 'E') | |
2501 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) | |
2502 | if ((tem = regno_use_in (regno , XVECEXP (x, i, j)))) | |
2503 | return tem; | |
2504 | } | |
2505 | ||
2506 | return NULL_RTX; | |
2507 | } | |
2dfa9a87 | 2508 | |
e5c56fd9 JH |
2509 | /* Return a value indicating whether OP, an operand of a commutative |
2510 | operation, is preferred as the first or second operand. The higher | |
2511 | the value, the stronger the preference for being the first operand. | |
2512 | We use negative values to indicate a preference for the first operand | |
2513 | and positive values for the second operand. */ | |
2514 | ||
2515 | static int | |
2516 | operand_preference (op) | |
2517 | rtx op; | |
2518 | { | |
2519 | /* Constants always come the second operand. Prefer "nice" constants. */ | |
2520 | if (GET_CODE (op) == CONST_INT) | |
0631e0bf | 2521 | return -5; |
e5c56fd9 | 2522 | if (GET_CODE (op) == CONST_DOUBLE) |
0631e0bf | 2523 | return -4; |
e5c56fd9 | 2524 | if (CONSTANT_P (op)) |
0631e0bf | 2525 | return -3; |
e5c56fd9 JH |
2526 | |
2527 | /* SUBREGs of objects should come second. */ | |
2528 | if (GET_CODE (op) == SUBREG | |
2529 | && GET_RTX_CLASS (GET_CODE (SUBREG_REG (op))) == 'o') | |
0631e0bf | 2530 | return -2; |
e5c56fd9 JH |
2531 | |
2532 | /* If only one operand is a `neg', `not', | |
2533 | `mult', `plus', or `minus' expression, it will be the first | |
2534 | operand. */ | |
2535 | if (GET_CODE (op) == NEG || GET_CODE (op) == NOT | |
2536 | || GET_CODE (op) == MULT || GET_CODE (op) == PLUS | |
2537 | || GET_CODE (op) == MINUS) | |
2538 | return 2; | |
2539 | ||
0631e0bf JH |
2540 | /* Complex expressions should be the first, so decrease priority |
2541 | of objects. */ | |
e5c56fd9 | 2542 | if (GET_RTX_CLASS (GET_CODE (op)) == 'o') |
0631e0bf | 2543 | return -1; |
e5c56fd9 JH |
2544 | return 0; |
2545 | } | |
2546 | ||
2547 | /* Return 1 iff it is neccesary to swap operands of commutative operation | |
2548 | in order to canonicalize expression. */ | |
2549 | ||
2550 | int | |
2551 | swap_commutative_operands_p (x, y) | |
2552 | rtx x, y; | |
2553 | { | |
2554 | return operand_preference (x) < operand_preference (y); | |
2555 | } | |
2dfa9a87 MH |
2556 | |
2557 | /* Return 1 if X is an autoincrement side effect and the register is | |
2558 | not the stack pointer. */ | |
2559 | int | |
2560 | auto_inc_p (x) | |
2561 | rtx x; | |
2562 | { | |
2563 | switch (GET_CODE (x)) | |
2564 | { | |
2565 | case PRE_INC: | |
2566 | case POST_INC: | |
2567 | case PRE_DEC: | |
2568 | case POST_DEC: | |
2569 | case PRE_MODIFY: | |
2570 | case POST_MODIFY: | |
2571 | /* There are no REG_INC notes for SP. */ | |
2572 | if (XEXP (x, 0) != stack_pointer_rtx) | |
2573 | return 1; | |
2574 | default: | |
2575 | break; | |
2576 | } | |
2577 | return 0; | |
2578 | } | |
3b10cf4b MM |
2579 | |
2580 | /* Return 1 if the sequence of instructions beginning with FROM and up | |
2581 | to and including TO is safe to move. If NEW_TO is non-NULL, and | |
2582 | the sequence is not already safe to move, but can be easily | |
2583 | extended to a sequence which is safe, then NEW_TO will point to the | |
7015a814 MM |
2584 | end of the extended sequence. |
2585 | ||
2586 | For now, this function only checks that the region contains whole | |
5bea1ccf | 2587 | exception regions, but it could be extended to check additional |
7015a814 | 2588 | conditions as well. */ |
3b10cf4b MM |
2589 | |
2590 | int | |
2591 | insns_safe_to_move_p (from, to, new_to) | |
2592 | rtx from; | |
2593 | rtx to; | |
2594 | rtx *new_to; | |
2595 | { | |
2596 | int eh_region_count = 0; | |
2597 | int past_to_p = 0; | |
2598 | rtx r = from; | |
2599 | ||
7015a814 MM |
2600 | /* By default, assume the end of the region will be what was |
2601 | suggested. */ | |
2602 | if (new_to) | |
2603 | *new_to = to; | |
2604 | ||
3b10cf4b MM |
2605 | while (r) |
2606 | { | |
2607 | if (GET_CODE (r) == NOTE) | |
2608 | { | |
2609 | switch (NOTE_LINE_NUMBER (r)) | |
2610 | { | |
2611 | case NOTE_INSN_EH_REGION_BEG: | |
2612 | ++eh_region_count; | |
2613 | break; | |
2614 | ||
2615 | case NOTE_INSN_EH_REGION_END: | |
2616 | if (eh_region_count == 0) | |
2617 | /* This sequence of instructions contains the end of | |
2618 | an exception region, but not he beginning. Moving | |
2619 | it will cause chaos. */ | |
2620 | return 0; | |
2621 | ||
2622 | --eh_region_count; | |
2623 | break; | |
2624 | ||
2625 | default: | |
2626 | break; | |
2627 | } | |
2628 | } | |
2629 | else if (past_to_p) | |
2630 | /* If we've passed TO, and we see a non-note instruction, we | |
2631 | can't extend the sequence to a movable sequence. */ | |
2632 | return 0; | |
2633 | ||
2634 | if (r == to) | |
2635 | { | |
2636 | if (!new_to) | |
2637 | /* It's OK to move the sequence if there were matched sets of | |
2638 | exception region notes. */ | |
2639 | return eh_region_count == 0; | |
2640 | ||
2641 | past_to_p = 1; | |
2642 | } | |
2643 | ||
2644 | /* It's OK to move the sequence if there were matched sets of | |
2645 | exception region notes. */ | |
2646 | if (past_to_p && eh_region_count == 0) | |
2647 | { | |
2648 | *new_to = r; | |
2649 | return 1; | |
2650 | } | |
2651 | ||
2652 | /* Go to the next instruction. */ | |
2653 | r = NEXT_INSN (r); | |
2654 | } | |
2655 | ||
2656 | return 0; | |
2657 | } | |
db7ba742 R |
2658 | |
2659 | /* Return non-zero if IN contains a piece of rtl that has the address LOC */ | |
2660 | int | |
2661 | loc_mentioned_in_p (loc, in) | |
2662 | rtx *loc, in; | |
2663 | { | |
2664 | enum rtx_code code = GET_CODE (in); | |
2665 | const char *fmt = GET_RTX_FORMAT (code); | |
2666 | int i, j; | |
2667 | ||
2668 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2669 | { | |
2670 | if (loc == &in->fld[i].rtx) | |
2671 | return 1; | |
2672 | if (fmt[i] == 'e') | |
2673 | { | |
2674 | if (loc_mentioned_in_p (loc, XEXP (in, i))) | |
2675 | return 1; | |
2676 | } | |
2677 | else if (fmt[i] == 'E') | |
2678 | for (j = XVECLEN (in, i) - 1; j >= 0; j--) | |
2679 | if (loc_mentioned_in_p (loc, XVECEXP (in, i, j))) | |
2680 | return 1; | |
2681 | } | |
2682 | return 0; | |
2683 | } | |
ddef6bc7 JJ |
2684 | |
2685 | /* This function returns the regno offset of a subreg expression. | |
2686 | xregno - A regno of an inner hard subreg_reg (or what will become one). | |
2687 | xmode - The mode of xregno. | |
2688 | offset - The byte offset. | |
2689 | ymode - The mode of a top level SUBREG (or what may become one). | |
2690 | RETURN - The regno offset which would be used. | |
2691 | This function can be overridden by defining SUBREG_REGNO_OFFSET, | |
2692 | taking the same parameters. */ | |
2693 | unsigned int | |
2694 | subreg_regno_offset (xregno, xmode, offset, ymode) | |
2695 | unsigned int xregno; | |
2696 | enum machine_mode xmode; | |
2697 | unsigned int offset; | |
2698 | enum machine_mode ymode; | |
2699 | { | |
2700 | unsigned ret; | |
2701 | int nregs_xmode, nregs_ymode; | |
2702 | int mode_multiple, nregs_multiple; | |
2703 | int y_offset; | |
2704 | ||
2705 | /* Check for an override, and use it instead. */ | |
2706 | #ifdef SUBREG_REGNO_OFFSET | |
2707 | ret = SUBREG_REGNO_OFFSET (xregno, xmode, offset, ymode) | |
2708 | #else | |
2709 | if (xregno >= FIRST_PSEUDO_REGISTER) | |
2710 | abort (); | |
2711 | ||
2712 | nregs_xmode = HARD_REGNO_NREGS (xregno, xmode); | |
2713 | nregs_ymode = HARD_REGNO_NREGS (xregno, ymode); | |
2714 | if (offset == 0 || nregs_xmode == nregs_ymode) | |
2715 | return 0; | |
2716 | ||
2717 | /* size of ymode must not be greater than the size of xmode. */ | |
2718 | mode_multiple = GET_MODE_SIZE (xmode) / GET_MODE_SIZE (ymode); | |
2719 | if (mode_multiple == 0) | |
2720 | abort (); | |
2721 | ||
2722 | y_offset = offset / GET_MODE_SIZE (ymode); | |
2723 | nregs_multiple = nregs_xmode / nregs_ymode; | |
2724 | ret = (y_offset / (mode_multiple / nregs_multiple)) * nregs_ymode; | |
2725 | #endif | |
2726 | ||
2727 | return ret; | |
2728 | } | |
2729 | ||
2730 | /* Return the final regno that a subreg expression refers to. */ | |
2731 | unsigned int | |
2732 | subreg_regno (x) | |
2733 | rtx x; | |
2734 | { | |
2735 | unsigned int ret; | |
2736 | rtx subreg = SUBREG_REG (x); | |
2737 | int regno = REGNO (subreg); | |
2738 | ||
2739 | ret = regno + subreg_regno_offset (regno, | |
2740 | GET_MODE (subreg), | |
2741 | SUBREG_BYTE (x), | |
2742 | GET_MODE (x)); | |
2743 | return ret; | |
2744 | ||
2745 | } |