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af082de3 | 1 | /* Analyze RTL for GNU compiler. |
af841dbd | 2 | Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
af082de3 BE |
3 | 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software |
4 | Foundation, Inc. | |
2c88418c | 5 | |
1322177d | 6 | This file is part of GCC. |
2c88418c | 7 | |
1322177d LB |
8 | GCC is free software; you can redistribute it and/or modify it under |
9 | the terms of the GNU General Public License as published by the Free | |
10 | Software Foundation; either version 2, or (at your option) any later | |
11 | version. | |
2c88418c | 12 | |
1322177d LB |
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
2c88418c RS |
17 | |
18 | You should have received a copy of the GNU General Public License | |
1322177d | 19 | along with GCC; see the file COPYING. If not, write to the Free |
366ccddb KC |
20 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
21 | 02110-1301, USA. */ | |
2c88418c RS |
22 | |
23 | ||
24 | #include "config.h" | |
670ee920 | 25 | #include "system.h" |
4977bab6 ZW |
26 | #include "coretypes.h" |
27 | #include "tm.h" | |
e35b9579 | 28 | #include "toplev.h" |
2c88418c | 29 | #include "rtl.h" |
3335f1d9 | 30 | #include "hard-reg-set.h" |
bc204393 RH |
31 | #include "insn-config.h" |
32 | #include "recog.h" | |
f894b69b PB |
33 | #include "target.h" |
34 | #include "output.h" | |
91ea4f8d | 35 | #include "tm_p.h" |
f5eb5fd0 | 36 | #include "flags.h" |
52bfebf0 | 37 | #include "real.h" |
66fd46b6 | 38 | #include "regs.h" |
2f93eea8 | 39 | #include "function.h" |
2c88418c | 40 | |
e2373f95 | 41 | /* Forward declarations */ |
0c20a65f | 42 | static void set_of_1 (rtx, rtx, void *); |
194acded HPN |
43 | static bool covers_regno_p (rtx, unsigned int); |
44 | static bool covers_regno_no_parallel_p (rtx, unsigned int); | |
0c20a65f AJ |
45 | static int rtx_referenced_p_1 (rtx *, void *); |
46 | static int computed_jump_p_1 (rtx); | |
47 | static void parms_set (rtx, rtx, void *); | |
2a1777af | 48 | |
2f93eea8 PB |
49 | static unsigned HOST_WIDE_INT cached_nonzero_bits (rtx, enum machine_mode, |
50 | rtx, enum machine_mode, | |
51 | unsigned HOST_WIDE_INT); | |
52 | static unsigned HOST_WIDE_INT nonzero_bits1 (rtx, enum machine_mode, rtx, | |
53 | enum machine_mode, | |
54 | unsigned HOST_WIDE_INT); | |
55 | static unsigned int cached_num_sign_bit_copies (rtx, enum machine_mode, rtx, | |
56 | enum machine_mode, | |
57 | unsigned int); | |
58 | static unsigned int num_sign_bit_copies1 (rtx, enum machine_mode, rtx, | |
59 | enum machine_mode, unsigned int); | |
60 | ||
cf94b0fc PB |
61 | /* Offset of the first 'e', 'E' or 'V' operand for each rtx code, or |
62 | -1 if a code has no such operand. */ | |
63 | static int non_rtx_starting_operands[NUM_RTX_CODE]; | |
64 | ||
2c88418c RS |
65 | /* Bit flags that specify the machine subtype we are compiling for. |
66 | Bits are tested using macros TARGET_... defined in the tm.h file | |
67 | and set by `-m...' switches. Must be defined in rtlanal.c. */ | |
68 | ||
69 | int target_flags; | |
b12cbf2c AN |
70 | |
71 | /* Truncation narrows the mode from SOURCE mode to DESTINATION mode. | |
72 | If TARGET_MODE_REP_EXTENDED (DESTINATION, DESTINATION_REP) is | |
73 | SIGN_EXTEND then while narrowing we also have to enforce the | |
74 | representation and sign-extend the value to mode DESTINATION_REP. | |
75 | ||
76 | If the value is already sign-extended to DESTINATION_REP mode we | |
77 | can just switch to DESTINATION mode on it. For each pair of | |
78 | integral modes SOURCE and DESTINATION, when truncating from SOURCE | |
79 | to DESTINATION, NUM_SIGN_BIT_COPIES_IN_REP[SOURCE][DESTINATION] | |
80 | contains the number of high-order bits in SOURCE that have to be | |
81 | copies of the sign-bit so that we can do this mode-switch to | |
82 | DESTINATION. */ | |
83 | ||
84 | static unsigned int | |
85 | num_sign_bit_copies_in_rep[MAX_MODE_INT + 1][MAX_MODE_INT + 1]; | |
2c88418c RS |
86 | \f |
87 | /* Return 1 if the value of X is unstable | |
88 | (would be different at a different point in the program). | |
89 | The frame pointer, arg pointer, etc. are considered stable | |
90 | (within one function) and so is anything marked `unchanging'. */ | |
91 | ||
92 | int | |
0c20a65f | 93 | rtx_unstable_p (rtx x) |
2c88418c | 94 | { |
b3694847 SS |
95 | RTX_CODE code = GET_CODE (x); |
96 | int i; | |
97 | const char *fmt; | |
2c88418c | 98 | |
ae0fb1b9 JW |
99 | switch (code) |
100 | { | |
101 | case MEM: | |
389fdba0 | 102 | return !MEM_READONLY_P (x) || rtx_unstable_p (XEXP (x, 0)); |
2c88418c | 103 | |
ae0fb1b9 JW |
104 | case CONST: |
105 | case CONST_INT: | |
106 | case CONST_DOUBLE: | |
69ef87e2 | 107 | case CONST_VECTOR: |
ae0fb1b9 JW |
108 | case SYMBOL_REF: |
109 | case LABEL_REF: | |
110 | return 0; | |
2c88418c | 111 | |
ae0fb1b9 JW |
112 | case REG: |
113 | /* As in rtx_varies_p, we have to use the actual rtx, not reg number. */ | |
c0fc376b | 114 | if (x == frame_pointer_rtx || x == hard_frame_pointer_rtx |
3335f1d9 | 115 | /* The arg pointer varies if it is not a fixed register. */ |
389fdba0 | 116 | || (x == arg_pointer_rtx && fixed_regs[ARG_POINTER_REGNUM])) |
c0fc376b RH |
117 | return 0; |
118 | #ifndef PIC_OFFSET_TABLE_REG_CALL_CLOBBERED | |
119 | /* ??? When call-clobbered, the value is stable modulo the restore | |
120 | that must happen after a call. This currently screws up local-alloc | |
121 | into believing that the restore is not needed. */ | |
122 | if (x == pic_offset_table_rtx) | |
123 | return 0; | |
124 | #endif | |
125 | return 1; | |
ae0fb1b9 JW |
126 | |
127 | case ASM_OPERANDS: | |
128 | if (MEM_VOLATILE_P (x)) | |
129 | return 1; | |
130 | ||
5d3cc252 | 131 | /* Fall through. */ |
ae0fb1b9 JW |
132 | |
133 | default: | |
134 | break; | |
135 | } | |
2c88418c RS |
136 | |
137 | fmt = GET_RTX_FORMAT (code); | |
138 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
139 | if (fmt[i] == 'e') | |
9c82ac6b JW |
140 | { |
141 | if (rtx_unstable_p (XEXP (x, i))) | |
142 | return 1; | |
143 | } | |
144 | else if (fmt[i] == 'E') | |
145 | { | |
146 | int j; | |
147 | for (j = 0; j < XVECLEN (x, i); j++) | |
148 | if (rtx_unstable_p (XVECEXP (x, i, j))) | |
149 | return 1; | |
150 | } | |
151 | ||
2c88418c RS |
152 | return 0; |
153 | } | |
154 | ||
155 | /* Return 1 if X has a value that can vary even between two | |
156 | executions of the program. 0 means X can be compared reliably | |
157 | against certain constants or near-constants. | |
e38fe8e0 BS |
158 | FOR_ALIAS is nonzero if we are called from alias analysis; if it is |
159 | zero, we are slightly more conservative. | |
2c88418c RS |
160 | The frame pointer and the arg pointer are considered constant. */ |
161 | ||
162 | int | |
0c20a65f | 163 | rtx_varies_p (rtx x, int for_alias) |
2c88418c | 164 | { |
e978d62e | 165 | RTX_CODE code; |
b3694847 SS |
166 | int i; |
167 | const char *fmt; | |
2c88418c | 168 | |
e978d62e PB |
169 | if (!x) |
170 | return 0; | |
171 | ||
172 | code = GET_CODE (x); | |
2c88418c RS |
173 | switch (code) |
174 | { | |
175 | case MEM: | |
389fdba0 | 176 | return !MEM_READONLY_P (x) || rtx_varies_p (XEXP (x, 0), for_alias); |
55efb413 | 177 | |
2c88418c RS |
178 | case CONST: |
179 | case CONST_INT: | |
180 | case CONST_DOUBLE: | |
69ef87e2 | 181 | case CONST_VECTOR: |
2c88418c RS |
182 | case SYMBOL_REF: |
183 | case LABEL_REF: | |
184 | return 0; | |
185 | ||
186 | case REG: | |
187 | /* Note that we have to test for the actual rtx used for the frame | |
188 | and arg pointers and not just the register number in case we have | |
189 | eliminated the frame and/or arg pointer and are using it | |
190 | for pseudos. */ | |
c0fc376b | 191 | if (x == frame_pointer_rtx || x == hard_frame_pointer_rtx |
3335f1d9 JL |
192 | /* The arg pointer varies if it is not a fixed register. */ |
193 | || (x == arg_pointer_rtx && fixed_regs[ARG_POINTER_REGNUM])) | |
c0fc376b | 194 | return 0; |
e38fe8e0 BS |
195 | if (x == pic_offset_table_rtx |
196 | #ifdef PIC_OFFSET_TABLE_REG_CALL_CLOBBERED | |
197 | /* ??? When call-clobbered, the value is stable modulo the restore | |
198 | that must happen after a call. This currently screws up | |
199 | local-alloc into believing that the restore is not needed, so we | |
200 | must return 0 only if we are called from alias analysis. */ | |
201 | && for_alias | |
c0fc376b | 202 | #endif |
e38fe8e0 BS |
203 | ) |
204 | return 0; | |
c0fc376b | 205 | return 1; |
2c88418c RS |
206 | |
207 | case LO_SUM: | |
208 | /* The operand 0 of a LO_SUM is considered constant | |
e7d96a83 JW |
209 | (in fact it is related specifically to operand 1) |
210 | during alias analysis. */ | |
211 | return (! for_alias && rtx_varies_p (XEXP (x, 0), for_alias)) | |
212 | || rtx_varies_p (XEXP (x, 1), for_alias); | |
a6a2274a | 213 | |
ae0fb1b9 JW |
214 | case ASM_OPERANDS: |
215 | if (MEM_VOLATILE_P (x)) | |
216 | return 1; | |
217 | ||
5d3cc252 | 218 | /* Fall through. */ |
ae0fb1b9 | 219 | |
e9a25f70 JL |
220 | default: |
221 | break; | |
2c88418c RS |
222 | } |
223 | ||
224 | fmt = GET_RTX_FORMAT (code); | |
225 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
226 | if (fmt[i] == 'e') | |
9c82ac6b | 227 | { |
e38fe8e0 | 228 | if (rtx_varies_p (XEXP (x, i), for_alias)) |
9c82ac6b JW |
229 | return 1; |
230 | } | |
231 | else if (fmt[i] == 'E') | |
232 | { | |
233 | int j; | |
234 | for (j = 0; j < XVECLEN (x, i); j++) | |
e38fe8e0 | 235 | if (rtx_varies_p (XVECEXP (x, i, j), for_alias)) |
9c82ac6b JW |
236 | return 1; |
237 | } | |
238 | ||
2c88418c RS |
239 | return 0; |
240 | } | |
241 | ||
2358ff91 EB |
242 | /* Return nonzero if the use of X as an address in a MEM can cause a trap. |
243 | MODE is the mode of the MEM (not that of X) and UNALIGNED_MEMS controls | |
244 | whether nonzero is returned for unaligned memory accesses on strict | |
245 | alignment machines. */ | |
2c88418c | 246 | |
2358ff91 EB |
247 | static int |
248 | rtx_addr_can_trap_p_1 (rtx x, enum machine_mode mode, bool unaligned_mems) | |
2c88418c | 249 | { |
b3694847 | 250 | enum rtx_code code = GET_CODE (x); |
2c88418c RS |
251 | |
252 | switch (code) | |
253 | { | |
254 | case SYMBOL_REF: | |
ff0b6b99 FS |
255 | return SYMBOL_REF_WEAK (x); |
256 | ||
2c88418c | 257 | case LABEL_REF: |
2c88418c RS |
258 | return 0; |
259 | ||
260 | case REG: | |
261 | /* As in rtx_varies_p, we have to use the actual rtx, not reg number. */ | |
4f73495e RH |
262 | if (x == frame_pointer_rtx || x == hard_frame_pointer_rtx |
263 | || x == stack_pointer_rtx | |
264 | /* The arg pointer varies if it is not a fixed register. */ | |
265 | || (x == arg_pointer_rtx && fixed_regs[ARG_POINTER_REGNUM])) | |
266 | return 0; | |
267 | /* All of the virtual frame registers are stack references. */ | |
268 | if (REGNO (x) >= FIRST_VIRTUAL_REGISTER | |
269 | && REGNO (x) <= LAST_VIRTUAL_REGISTER) | |
270 | return 0; | |
271 | return 1; | |
2c88418c RS |
272 | |
273 | case CONST: | |
2358ff91 | 274 | return rtx_addr_can_trap_p_1 (XEXP (x, 0), mode, unaligned_mems); |
2c88418c RS |
275 | |
276 | case PLUS: | |
2358ff91 EB |
277 | /* An address is assumed not to trap if: |
278 | - it is an address that can't trap plus a constant integer, | |
279 | with the proper remainder modulo the mode size if we are | |
280 | considering unaligned memory references. */ | |
281 | if (!rtx_addr_can_trap_p_1 (XEXP (x, 0), mode, unaligned_mems) | |
282 | && GET_CODE (XEXP (x, 1)) == CONST_INT) | |
283 | { | |
284 | HOST_WIDE_INT offset; | |
285 | ||
bb11103a EB |
286 | if (!STRICT_ALIGNMENT |
287 | || !unaligned_mems | |
288 | || GET_MODE_SIZE (mode) == 0) | |
2358ff91 EB |
289 | return 0; |
290 | ||
291 | offset = INTVAL (XEXP (x, 1)); | |
292 | ||
293 | #ifdef SPARC_STACK_BOUNDARY_HACK | |
294 | /* ??? The SPARC port may claim a STACK_BOUNDARY higher than | |
295 | the real alignment of %sp. However, when it does this, the | |
296 | alignment of %sp+STACK_POINTER_OFFSET is STACK_BOUNDARY. */ | |
297 | if (SPARC_STACK_BOUNDARY_HACK | |
298 | && (XEXP (x, 0) == stack_pointer_rtx | |
299 | || XEXP (x, 0) == hard_frame_pointer_rtx)) | |
300 | offset -= STACK_POINTER_OFFSET; | |
301 | #endif | |
302 | ||
303 | return offset % GET_MODE_SIZE (mode) != 0; | |
304 | } | |
305 | ||
306 | /* - or it is the pic register plus a constant. */ | |
307 | if (XEXP (x, 0) == pic_offset_table_rtx && CONSTANT_P (XEXP (x, 1))) | |
308 | return 0; | |
309 | ||
310 | return 1; | |
2c88418c RS |
311 | |
312 | case LO_SUM: | |
4f73495e | 313 | case PRE_MODIFY: |
2358ff91 | 314 | return rtx_addr_can_trap_p_1 (XEXP (x, 1), mode, unaligned_mems); |
4f73495e RH |
315 | |
316 | case PRE_DEC: | |
317 | case PRE_INC: | |
318 | case POST_DEC: | |
319 | case POST_INC: | |
320 | case POST_MODIFY: | |
2358ff91 | 321 | return rtx_addr_can_trap_p_1 (XEXP (x, 0), mode, unaligned_mems); |
4f73495e | 322 | |
e9a25f70 JL |
323 | default: |
324 | break; | |
2c88418c RS |
325 | } |
326 | ||
327 | /* If it isn't one of the case above, it can cause a trap. */ | |
328 | return 1; | |
329 | } | |
330 | ||
2358ff91 EB |
331 | /* Return nonzero if the use of X as an address in a MEM can cause a trap. */ |
332 | ||
333 | int | |
334 | rtx_addr_can_trap_p (rtx x) | |
335 | { | |
336 | return rtx_addr_can_trap_p_1 (x, VOIDmode, false); | |
337 | } | |
338 | ||
4977bab6 ZW |
339 | /* Return true if X is an address that is known to not be zero. */ |
340 | ||
341 | bool | |
0c20a65f | 342 | nonzero_address_p (rtx x) |
4977bab6 ZW |
343 | { |
344 | enum rtx_code code = GET_CODE (x); | |
345 | ||
346 | switch (code) | |
347 | { | |
348 | case SYMBOL_REF: | |
349 | return !SYMBOL_REF_WEAK (x); | |
350 | ||
351 | case LABEL_REF: | |
352 | return true; | |
353 | ||
4977bab6 ZW |
354 | case REG: |
355 | /* As in rtx_varies_p, we have to use the actual rtx, not reg number. */ | |
356 | if (x == frame_pointer_rtx || x == hard_frame_pointer_rtx | |
357 | || x == stack_pointer_rtx | |
358 | || (x == arg_pointer_rtx && fixed_regs[ARG_POINTER_REGNUM])) | |
359 | return true; | |
360 | /* All of the virtual frame registers are stack references. */ | |
361 | if (REGNO (x) >= FIRST_VIRTUAL_REGISTER | |
362 | && REGNO (x) <= LAST_VIRTUAL_REGISTER) | |
363 | return true; | |
364 | return false; | |
365 | ||
366 | case CONST: | |
367 | return nonzero_address_p (XEXP (x, 0)); | |
368 | ||
369 | case PLUS: | |
370 | if (GET_CODE (XEXP (x, 1)) == CONST_INT) | |
942d7821 | 371 | return nonzero_address_p (XEXP (x, 0)); |
4977bab6 ZW |
372 | /* Handle PIC references. */ |
373 | else if (XEXP (x, 0) == pic_offset_table_rtx | |
374 | && CONSTANT_P (XEXP (x, 1))) | |
375 | return true; | |
376 | return false; | |
377 | ||
378 | case PRE_MODIFY: | |
379 | /* Similar to the above; allow positive offsets. Further, since | |
380 | auto-inc is only allowed in memories, the register must be a | |
381 | pointer. */ | |
382 | if (GET_CODE (XEXP (x, 1)) == CONST_INT | |
383 | && INTVAL (XEXP (x, 1)) > 0) | |
384 | return true; | |
385 | return nonzero_address_p (XEXP (x, 0)); | |
386 | ||
387 | case PRE_INC: | |
388 | /* Similarly. Further, the offset is always positive. */ | |
389 | return true; | |
390 | ||
391 | case PRE_DEC: | |
392 | case POST_DEC: | |
393 | case POST_INC: | |
394 | case POST_MODIFY: | |
395 | return nonzero_address_p (XEXP (x, 0)); | |
396 | ||
397 | case LO_SUM: | |
398 | return nonzero_address_p (XEXP (x, 1)); | |
399 | ||
400 | default: | |
401 | break; | |
402 | } | |
403 | ||
404 | /* If it isn't one of the case above, might be zero. */ | |
405 | return false; | |
406 | } | |
407 | ||
a6a2274a | 408 | /* Return 1 if X refers to a memory location whose address |
2c88418c | 409 | cannot be compared reliably with constant addresses, |
a6a2274a | 410 | or if X refers to a BLKmode memory object. |
e38fe8e0 BS |
411 | FOR_ALIAS is nonzero if we are called from alias analysis; if it is |
412 | zero, we are slightly more conservative. */ | |
2c88418c RS |
413 | |
414 | int | |
0c20a65f | 415 | rtx_addr_varies_p (rtx x, int for_alias) |
2c88418c | 416 | { |
b3694847 SS |
417 | enum rtx_code code; |
418 | int i; | |
419 | const char *fmt; | |
2c88418c RS |
420 | |
421 | if (x == 0) | |
422 | return 0; | |
423 | ||
424 | code = GET_CODE (x); | |
425 | if (code == MEM) | |
e38fe8e0 | 426 | return GET_MODE (x) == BLKmode || rtx_varies_p (XEXP (x, 0), for_alias); |
2c88418c RS |
427 | |
428 | fmt = GET_RTX_FORMAT (code); | |
429 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
430 | if (fmt[i] == 'e') | |
833c0b26 | 431 | { |
e38fe8e0 | 432 | if (rtx_addr_varies_p (XEXP (x, i), for_alias)) |
833c0b26 RK |
433 | return 1; |
434 | } | |
435 | else if (fmt[i] == 'E') | |
436 | { | |
437 | int j; | |
438 | for (j = 0; j < XVECLEN (x, i); j++) | |
e38fe8e0 | 439 | if (rtx_addr_varies_p (XVECEXP (x, i, j), for_alias)) |
833c0b26 RK |
440 | return 1; |
441 | } | |
2c88418c RS |
442 | return 0; |
443 | } | |
444 | \f | |
445 | /* Return the value of the integer term in X, if one is apparent; | |
446 | otherwise return 0. | |
447 | Only obvious integer terms are detected. | |
3ef42a0c | 448 | This is used in cse.c with the `related_value' field. */ |
2c88418c | 449 | |
c166a311 | 450 | HOST_WIDE_INT |
0c20a65f | 451 | get_integer_term (rtx x) |
2c88418c RS |
452 | { |
453 | if (GET_CODE (x) == CONST) | |
454 | x = XEXP (x, 0); | |
455 | ||
456 | if (GET_CODE (x) == MINUS | |
457 | && GET_CODE (XEXP (x, 1)) == CONST_INT) | |
458 | return - INTVAL (XEXP (x, 1)); | |
459 | if (GET_CODE (x) == PLUS | |
460 | && GET_CODE (XEXP (x, 1)) == CONST_INT) | |
461 | return INTVAL (XEXP (x, 1)); | |
462 | return 0; | |
463 | } | |
464 | ||
465 | /* If X is a constant, return the value sans apparent integer term; | |
466 | otherwise return 0. | |
467 | Only obvious integer terms are detected. */ | |
468 | ||
469 | rtx | |
0c20a65f | 470 | get_related_value (rtx x) |
2c88418c RS |
471 | { |
472 | if (GET_CODE (x) != CONST) | |
473 | return 0; | |
474 | x = XEXP (x, 0); | |
475 | if (GET_CODE (x) == PLUS | |
476 | && GET_CODE (XEXP (x, 1)) == CONST_INT) | |
477 | return XEXP (x, 0); | |
478 | else if (GET_CODE (x) == MINUS | |
479 | && GET_CODE (XEXP (x, 1)) == CONST_INT) | |
480 | return XEXP (x, 0); | |
481 | return 0; | |
482 | } | |
483 | \f | |
4b983fdc RH |
484 | /* Return the number of places FIND appears within X. If COUNT_DEST is |
485 | zero, we do not count occurrences inside the destination of a SET. */ | |
486 | ||
487 | int | |
0c20a65f | 488 | count_occurrences (rtx x, rtx find, int count_dest) |
4b983fdc RH |
489 | { |
490 | int i, j; | |
491 | enum rtx_code code; | |
492 | const char *format_ptr; | |
493 | int count; | |
494 | ||
495 | if (x == find) | |
496 | return 1; | |
497 | ||
498 | code = GET_CODE (x); | |
499 | ||
500 | switch (code) | |
501 | { | |
502 | case REG: | |
503 | case CONST_INT: | |
504 | case CONST_DOUBLE: | |
69ef87e2 | 505 | case CONST_VECTOR: |
4b983fdc RH |
506 | case SYMBOL_REF: |
507 | case CODE_LABEL: | |
508 | case PC: | |
509 | case CC0: | |
510 | return 0; | |
511 | ||
512 | case MEM: | |
3c0cb5de | 513 | if (MEM_P (find) && rtx_equal_p (x, find)) |
4b983fdc RH |
514 | return 1; |
515 | break; | |
516 | ||
517 | case SET: | |
518 | if (SET_DEST (x) == find && ! count_dest) | |
519 | return count_occurrences (SET_SRC (x), find, count_dest); | |
520 | break; | |
521 | ||
522 | default: | |
523 | break; | |
524 | } | |
525 | ||
526 | format_ptr = GET_RTX_FORMAT (code); | |
527 | count = 0; | |
528 | ||
529 | for (i = 0; i < GET_RTX_LENGTH (code); i++) | |
530 | { | |
531 | switch (*format_ptr++) | |
532 | { | |
533 | case 'e': | |
534 | count += count_occurrences (XEXP (x, i), find, count_dest); | |
535 | break; | |
536 | ||
537 | case 'E': | |
538 | for (j = 0; j < XVECLEN (x, i); j++) | |
539 | count += count_occurrences (XVECEXP (x, i, j), find, count_dest); | |
540 | break; | |
541 | } | |
542 | } | |
543 | return count; | |
544 | } | |
545 | \f | |
2c88418c RS |
546 | /* Nonzero if register REG appears somewhere within IN. |
547 | Also works if REG is not a register; in this case it checks | |
548 | for a subexpression of IN that is Lisp "equal" to REG. */ | |
549 | ||
550 | int | |
0c20a65f | 551 | reg_mentioned_p (rtx reg, rtx in) |
2c88418c | 552 | { |
b3694847 SS |
553 | const char *fmt; |
554 | int i; | |
555 | enum rtx_code code; | |
2c88418c RS |
556 | |
557 | if (in == 0) | |
558 | return 0; | |
559 | ||
560 | if (reg == in) | |
561 | return 1; | |
562 | ||
563 | if (GET_CODE (in) == LABEL_REF) | |
564 | return reg == XEXP (in, 0); | |
565 | ||
566 | code = GET_CODE (in); | |
567 | ||
568 | switch (code) | |
569 | { | |
570 | /* Compare registers by number. */ | |
571 | case REG: | |
f8cfc6aa | 572 | return REG_P (reg) && REGNO (in) == REGNO (reg); |
2c88418c RS |
573 | |
574 | /* These codes have no constituent expressions | |
575 | and are unique. */ | |
576 | case SCRATCH: | |
577 | case CC0: | |
578 | case PC: | |
579 | return 0; | |
580 | ||
581 | case CONST_INT: | |
69ef87e2 | 582 | case CONST_VECTOR: |
2c88418c RS |
583 | case CONST_DOUBLE: |
584 | /* These are kept unique for a given value. */ | |
585 | return 0; | |
a6a2274a | 586 | |
e9a25f70 JL |
587 | default: |
588 | break; | |
2c88418c RS |
589 | } |
590 | ||
591 | if (GET_CODE (reg) == code && rtx_equal_p (reg, in)) | |
592 | return 1; | |
593 | ||
594 | fmt = GET_RTX_FORMAT (code); | |
595 | ||
596 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
597 | { | |
598 | if (fmt[i] == 'E') | |
599 | { | |
b3694847 | 600 | int j; |
2c88418c RS |
601 | for (j = XVECLEN (in, i) - 1; j >= 0; j--) |
602 | if (reg_mentioned_p (reg, XVECEXP (in, i, j))) | |
603 | return 1; | |
604 | } | |
605 | else if (fmt[i] == 'e' | |
606 | && reg_mentioned_p (reg, XEXP (in, i))) | |
607 | return 1; | |
608 | } | |
609 | return 0; | |
610 | } | |
611 | \f | |
612 | /* Return 1 if in between BEG and END, exclusive of BEG and END, there is | |
613 | no CODE_LABEL insn. */ | |
614 | ||
615 | int | |
0c20a65f | 616 | no_labels_between_p (rtx beg, rtx end) |
2c88418c | 617 | { |
b3694847 | 618 | rtx p; |
978f547f JH |
619 | if (beg == end) |
620 | return 0; | |
2c88418c | 621 | for (p = NEXT_INSN (beg); p != end; p = NEXT_INSN (p)) |
4b4bf941 | 622 | if (LABEL_P (p)) |
2c88418c RS |
623 | return 0; |
624 | return 1; | |
625 | } | |
626 | ||
627 | /* Nonzero if register REG is used in an insn between | |
628 | FROM_INSN and TO_INSN (exclusive of those two). */ | |
629 | ||
630 | int | |
0c20a65f | 631 | reg_used_between_p (rtx reg, rtx from_insn, rtx to_insn) |
2c88418c | 632 | { |
b3694847 | 633 | rtx insn; |
2c88418c RS |
634 | |
635 | if (from_insn == to_insn) | |
636 | return 0; | |
637 | ||
638 | for (insn = NEXT_INSN (from_insn); insn != to_insn; insn = NEXT_INSN (insn)) | |
2c3c49de | 639 | if (INSN_P (insn) |
8f3e7a26 | 640 | && (reg_overlap_mentioned_p (reg, PATTERN (insn)) |
76dd5923 | 641 | || (CALL_P (insn) && find_reg_fusage (insn, USE, reg)))) |
2c88418c RS |
642 | return 1; |
643 | return 0; | |
644 | } | |
645 | \f | |
646 | /* Nonzero if the old value of X, a register, is referenced in BODY. If X | |
647 | is entirely replaced by a new value and the only use is as a SET_DEST, | |
648 | we do not consider it a reference. */ | |
649 | ||
650 | int | |
0c20a65f | 651 | reg_referenced_p (rtx x, rtx body) |
2c88418c RS |
652 | { |
653 | int i; | |
654 | ||
655 | switch (GET_CODE (body)) | |
656 | { | |
657 | case SET: | |
658 | if (reg_overlap_mentioned_p (x, SET_SRC (body))) | |
659 | return 1; | |
660 | ||
661 | /* If the destination is anything other than CC0, PC, a REG or a SUBREG | |
662 | of a REG that occupies all of the REG, the insn references X if | |
663 | it is mentioned in the destination. */ | |
664 | if (GET_CODE (SET_DEST (body)) != CC0 | |
665 | && GET_CODE (SET_DEST (body)) != PC | |
f8cfc6aa | 666 | && !REG_P (SET_DEST (body)) |
2c88418c | 667 | && ! (GET_CODE (SET_DEST (body)) == SUBREG |
f8cfc6aa | 668 | && REG_P (SUBREG_REG (SET_DEST (body))) |
2c88418c RS |
669 | && (((GET_MODE_SIZE (GET_MODE (SUBREG_REG (SET_DEST (body)))) |
670 | + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD) | |
671 | == ((GET_MODE_SIZE (GET_MODE (SET_DEST (body))) | |
672 | + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD))) | |
673 | && reg_overlap_mentioned_p (x, SET_DEST (body))) | |
674 | return 1; | |
e9a25f70 | 675 | return 0; |
2c88418c RS |
676 | |
677 | case ASM_OPERANDS: | |
678 | for (i = ASM_OPERANDS_INPUT_LENGTH (body) - 1; i >= 0; i--) | |
679 | if (reg_overlap_mentioned_p (x, ASM_OPERANDS_INPUT (body, i))) | |
680 | return 1; | |
e9a25f70 | 681 | return 0; |
2c88418c RS |
682 | |
683 | case CALL: | |
684 | case USE: | |
14a774a9 | 685 | case IF_THEN_ELSE: |
2c88418c RS |
686 | return reg_overlap_mentioned_p (x, body); |
687 | ||
688 | case TRAP_IF: | |
689 | return reg_overlap_mentioned_p (x, TRAP_CONDITION (body)); | |
690 | ||
21b8482a JJ |
691 | case PREFETCH: |
692 | return reg_overlap_mentioned_p (x, XEXP (body, 0)); | |
693 | ||
2ac4fed0 RK |
694 | case UNSPEC: |
695 | case UNSPEC_VOLATILE: | |
2f9fb4c2 R |
696 | for (i = XVECLEN (body, 0) - 1; i >= 0; i--) |
697 | if (reg_overlap_mentioned_p (x, XVECEXP (body, 0, i))) | |
698 | return 1; | |
699 | return 0; | |
700 | ||
2c88418c RS |
701 | case PARALLEL: |
702 | for (i = XVECLEN (body, 0) - 1; i >= 0; i--) | |
703 | if (reg_referenced_p (x, XVECEXP (body, 0, i))) | |
704 | return 1; | |
e9a25f70 | 705 | return 0; |
a6a2274a | 706 | |
0d3ffb5a | 707 | case CLOBBER: |
3c0cb5de | 708 | if (MEM_P (XEXP (body, 0))) |
0d3ffb5a GK |
709 | if (reg_overlap_mentioned_p (x, XEXP (XEXP (body, 0), 0))) |
710 | return 1; | |
711 | return 0; | |
712 | ||
0c99ec5c RH |
713 | case COND_EXEC: |
714 | if (reg_overlap_mentioned_p (x, COND_EXEC_TEST (body))) | |
715 | return 1; | |
716 | return reg_referenced_p (x, COND_EXEC_CODE (body)); | |
717 | ||
e9a25f70 JL |
718 | default: |
719 | return 0; | |
2c88418c | 720 | } |
2c88418c | 721 | } |
2c88418c RS |
722 | \f |
723 | /* Nonzero if register REG is set or clobbered in an insn between | |
724 | FROM_INSN and TO_INSN (exclusive of those two). */ | |
725 | ||
726 | int | |
0c20a65f | 727 | reg_set_between_p (rtx reg, rtx from_insn, rtx to_insn) |
2c88418c | 728 | { |
b3694847 | 729 | rtx insn; |
2c88418c RS |
730 | |
731 | if (from_insn == to_insn) | |
732 | return 0; | |
733 | ||
734 | for (insn = NEXT_INSN (from_insn); insn != to_insn; insn = NEXT_INSN (insn)) | |
2c3c49de | 735 | if (INSN_P (insn) && reg_set_p (reg, insn)) |
2c88418c RS |
736 | return 1; |
737 | return 0; | |
738 | } | |
739 | ||
740 | /* Internals of reg_set_between_p. */ | |
2c88418c | 741 | int |
0c20a65f | 742 | reg_set_p (rtx reg, rtx insn) |
2c88418c | 743 | { |
2c88418c RS |
744 | /* We can be passed an insn or part of one. If we are passed an insn, |
745 | check if a side-effect of the insn clobbers REG. */ | |
4977bab6 ZW |
746 | if (INSN_P (insn) |
747 | && (FIND_REG_INC_NOTE (insn, reg) | |
4b4bf941 | 748 | || (CALL_P (insn) |
f8cfc6aa | 749 | && ((REG_P (reg) |
4f1605d2 RS |
750 | && REGNO (reg) < FIRST_PSEUDO_REGISTER |
751 | && TEST_HARD_REG_BIT (regs_invalidated_by_call, | |
752 | REGNO (reg))) | |
3c0cb5de | 753 | || MEM_P (reg) |
4977bab6 ZW |
754 | || find_reg_fusage (insn, CLOBBER, reg))))) |
755 | return 1; | |
2c88418c | 756 | |
91b2d119 | 757 | return set_of (reg, insn) != NULL_RTX; |
2c88418c RS |
758 | } |
759 | ||
760 | /* Similar to reg_set_between_p, but check all registers in X. Return 0 | |
761 | only if none of them are modified between START and END. Return 1 if | |
7b52eede | 762 | X contains a MEM; this routine does usememory aliasing. */ |
2c88418c RS |
763 | |
764 | int | |
0c20a65f | 765 | modified_between_p (rtx x, rtx start, rtx end) |
2c88418c RS |
766 | { |
767 | enum rtx_code code = GET_CODE (x); | |
6f7d635c | 768 | const char *fmt; |
f8163c92 | 769 | int i, j; |
7b52eede JH |
770 | rtx insn; |
771 | ||
772 | if (start == end) | |
773 | return 0; | |
2c88418c RS |
774 | |
775 | switch (code) | |
776 | { | |
777 | case CONST_INT: | |
778 | case CONST_DOUBLE: | |
69ef87e2 | 779 | case CONST_VECTOR: |
2c88418c RS |
780 | case CONST: |
781 | case SYMBOL_REF: | |
782 | case LABEL_REF: | |
783 | return 0; | |
784 | ||
785 | case PC: | |
786 | case CC0: | |
787 | return 1; | |
788 | ||
789 | case MEM: | |
7b52eede | 790 | if (modified_between_p (XEXP (x, 0), start, end)) |
2c88418c | 791 | return 1; |
550b7784 KK |
792 | if (MEM_READONLY_P (x)) |
793 | return 0; | |
7b52eede JH |
794 | for (insn = NEXT_INSN (start); insn != end; insn = NEXT_INSN (insn)) |
795 | if (memory_modified_in_insn_p (x, insn)) | |
796 | return 1; | |
797 | return 0; | |
2c88418c RS |
798 | break; |
799 | ||
800 | case REG: | |
801 | return reg_set_between_p (x, start, end); | |
a6a2274a | 802 | |
e9a25f70 JL |
803 | default: |
804 | break; | |
2c88418c RS |
805 | } |
806 | ||
807 | fmt = GET_RTX_FORMAT (code); | |
808 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
f8163c92 RK |
809 | { |
810 | if (fmt[i] == 'e' && modified_between_p (XEXP (x, i), start, end)) | |
811 | return 1; | |
812 | ||
d4757e6a | 813 | else if (fmt[i] == 'E') |
f8163c92 RK |
814 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) |
815 | if (modified_between_p (XVECEXP (x, i, j), start, end)) | |
816 | return 1; | |
817 | } | |
818 | ||
819 | return 0; | |
820 | } | |
821 | ||
822 | /* Similar to reg_set_p, but check all registers in X. Return 0 only if none | |
823 | of them are modified in INSN. Return 1 if X contains a MEM; this routine | |
7b52eede | 824 | does use memory aliasing. */ |
f8163c92 RK |
825 | |
826 | int | |
0c20a65f | 827 | modified_in_p (rtx x, rtx insn) |
f8163c92 RK |
828 | { |
829 | enum rtx_code code = GET_CODE (x); | |
6f7d635c | 830 | const char *fmt; |
f8163c92 RK |
831 | int i, j; |
832 | ||
833 | switch (code) | |
834 | { | |
835 | case CONST_INT: | |
836 | case CONST_DOUBLE: | |
69ef87e2 | 837 | case CONST_VECTOR: |
f8163c92 RK |
838 | case CONST: |
839 | case SYMBOL_REF: | |
840 | case LABEL_REF: | |
841 | return 0; | |
842 | ||
843 | case PC: | |
844 | case CC0: | |
2c88418c RS |
845 | return 1; |
846 | ||
f8163c92 | 847 | case MEM: |
7b52eede | 848 | if (modified_in_p (XEXP (x, 0), insn)) |
f8163c92 | 849 | return 1; |
550b7784 KK |
850 | if (MEM_READONLY_P (x)) |
851 | return 0; | |
7b52eede JH |
852 | if (memory_modified_in_insn_p (x, insn)) |
853 | return 1; | |
854 | return 0; | |
f8163c92 RK |
855 | break; |
856 | ||
857 | case REG: | |
858 | return reg_set_p (x, insn); | |
e9a25f70 JL |
859 | |
860 | default: | |
861 | break; | |
f8163c92 RK |
862 | } |
863 | ||
864 | fmt = GET_RTX_FORMAT (code); | |
865 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
866 | { | |
867 | if (fmt[i] == 'e' && modified_in_p (XEXP (x, i), insn)) | |
868 | return 1; | |
869 | ||
d4757e6a | 870 | else if (fmt[i] == 'E') |
f8163c92 RK |
871 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) |
872 | if (modified_in_p (XVECEXP (x, i, j), insn)) | |
873 | return 1; | |
874 | } | |
875 | ||
2c88418c RS |
876 | return 0; |
877 | } | |
878 | \f | |
91b2d119 JH |
879 | /* Helper function for set_of. */ |
880 | struct set_of_data | |
881 | { | |
882 | rtx found; | |
883 | rtx pat; | |
884 | }; | |
885 | ||
886 | static void | |
0c20a65f | 887 | set_of_1 (rtx x, rtx pat, void *data1) |
91b2d119 JH |
888 | { |
889 | struct set_of_data *data = (struct set_of_data *) (data1); | |
890 | if (rtx_equal_p (x, data->pat) | |
3c0cb5de | 891 | || (!MEM_P (x) && reg_overlap_mentioned_p (data->pat, x))) |
91b2d119 JH |
892 | data->found = pat; |
893 | } | |
894 | ||
895 | /* Give an INSN, return a SET or CLOBBER expression that does modify PAT | |
eaec9b3d | 896 | (either directly or via STRICT_LOW_PART and similar modifiers). */ |
91b2d119 | 897 | rtx |
0c20a65f | 898 | set_of (rtx pat, rtx insn) |
91b2d119 JH |
899 | { |
900 | struct set_of_data data; | |
901 | data.found = NULL_RTX; | |
902 | data.pat = pat; | |
903 | note_stores (INSN_P (insn) ? PATTERN (insn) : insn, set_of_1, &data); | |
904 | return data.found; | |
905 | } | |
906 | \f | |
2c88418c RS |
907 | /* Given an INSN, return a SET expression if this insn has only a single SET. |
908 | It may also have CLOBBERs, USEs, or SET whose output | |
909 | will not be used, which we ignore. */ | |
910 | ||
911 | rtx | |
0c20a65f | 912 | single_set_2 (rtx insn, rtx pat) |
2c88418c | 913 | { |
c9b89a21 JH |
914 | rtx set = NULL; |
915 | int set_verified = 1; | |
2c88418c | 916 | int i; |
c9b89a21 | 917 | |
b1cdafbb | 918 | if (GET_CODE (pat) == PARALLEL) |
2c88418c | 919 | { |
c9b89a21 | 920 | for (i = 0; i < XVECLEN (pat, 0); i++) |
b1cdafbb | 921 | { |
c9b89a21 JH |
922 | rtx sub = XVECEXP (pat, 0, i); |
923 | switch (GET_CODE (sub)) | |
924 | { | |
925 | case USE: | |
926 | case CLOBBER: | |
927 | break; | |
928 | ||
929 | case SET: | |
930 | /* We can consider insns having multiple sets, where all | |
931 | but one are dead as single set insns. In common case | |
932 | only single set is present in the pattern so we want | |
f63d1bf7 | 933 | to avoid checking for REG_UNUSED notes unless necessary. |
c9b89a21 JH |
934 | |
935 | When we reach set first time, we just expect this is | |
936 | the single set we are looking for and only when more | |
937 | sets are found in the insn, we check them. */ | |
938 | if (!set_verified) | |
939 | { | |
940 | if (find_reg_note (insn, REG_UNUSED, SET_DEST (set)) | |
941 | && !side_effects_p (set)) | |
942 | set = NULL; | |
943 | else | |
944 | set_verified = 1; | |
945 | } | |
946 | if (!set) | |
947 | set = sub, set_verified = 0; | |
948 | else if (!find_reg_note (insn, REG_UNUSED, SET_DEST (sub)) | |
949 | || side_effects_p (sub)) | |
950 | return NULL_RTX; | |
951 | break; | |
952 | ||
953 | default: | |
954 | return NULL_RTX; | |
955 | } | |
787ccee0 | 956 | } |
2c88418c | 957 | } |
c9b89a21 | 958 | return set; |
2c88418c | 959 | } |
941c63ac JL |
960 | |
961 | /* Given an INSN, return nonzero if it has more than one SET, else return | |
962 | zero. */ | |
963 | ||
5f7d3786 | 964 | int |
0c20a65f | 965 | multiple_sets (rtx insn) |
941c63ac | 966 | { |
cae8acdd | 967 | int found; |
941c63ac | 968 | int i; |
a6a2274a | 969 | |
941c63ac | 970 | /* INSN must be an insn. */ |
2c3c49de | 971 | if (! INSN_P (insn)) |
941c63ac JL |
972 | return 0; |
973 | ||
974 | /* Only a PARALLEL can have multiple SETs. */ | |
975 | if (GET_CODE (PATTERN (insn)) == PARALLEL) | |
976 | { | |
977 | for (i = 0, found = 0; i < XVECLEN (PATTERN (insn), 0); i++) | |
978 | if (GET_CODE (XVECEXP (PATTERN (insn), 0, i)) == SET) | |
979 | { | |
980 | /* If we have already found a SET, then return now. */ | |
981 | if (found) | |
982 | return 1; | |
983 | else | |
984 | found = 1; | |
985 | } | |
986 | } | |
a6a2274a | 987 | |
941c63ac JL |
988 | /* Either zero or one SET. */ |
989 | return 0; | |
990 | } | |
2c88418c | 991 | \f |
7142e318 JW |
992 | /* Return nonzero if the destination of SET equals the source |
993 | and there are no side effects. */ | |
994 | ||
995 | int | |
0c20a65f | 996 | set_noop_p (rtx set) |
7142e318 JW |
997 | { |
998 | rtx src = SET_SRC (set); | |
999 | rtx dst = SET_DEST (set); | |
1000 | ||
371b8fc0 JH |
1001 | if (dst == pc_rtx && src == pc_rtx) |
1002 | return 1; | |
1003 | ||
3c0cb5de | 1004 | if (MEM_P (dst) && MEM_P (src)) |
cd648cec JH |
1005 | return rtx_equal_p (dst, src) && !side_effects_p (dst); |
1006 | ||
46d096a3 | 1007 | if (GET_CODE (dst) == ZERO_EXTRACT) |
7142e318 | 1008 | return rtx_equal_p (XEXP (dst, 0), src) |
cd648cec JH |
1009 | && ! BYTES_BIG_ENDIAN && XEXP (dst, 2) == const0_rtx |
1010 | && !side_effects_p (src); | |
7142e318 JW |
1011 | |
1012 | if (GET_CODE (dst) == STRICT_LOW_PART) | |
1013 | dst = XEXP (dst, 0); | |
1014 | ||
1015 | if (GET_CODE (src) == SUBREG && GET_CODE (dst) == SUBREG) | |
1016 | { | |
1017 | if (SUBREG_BYTE (src) != SUBREG_BYTE (dst)) | |
1018 | return 0; | |
1019 | src = SUBREG_REG (src); | |
1020 | dst = SUBREG_REG (dst); | |
1021 | } | |
1022 | ||
f8cfc6aa | 1023 | return (REG_P (src) && REG_P (dst) |
7142e318 JW |
1024 | && REGNO (src) == REGNO (dst)); |
1025 | } | |
0005550b JH |
1026 | \f |
1027 | /* Return nonzero if an insn consists only of SETs, each of which only sets a | |
1028 | value to itself. */ | |
1029 | ||
1030 | int | |
0c20a65f | 1031 | noop_move_p (rtx insn) |
0005550b JH |
1032 | { |
1033 | rtx pat = PATTERN (insn); | |
1034 | ||
b5832b43 JH |
1035 | if (INSN_CODE (insn) == NOOP_MOVE_INSN_CODE) |
1036 | return 1; | |
1037 | ||
0005550b JH |
1038 | /* Insns carrying these notes are useful later on. */ |
1039 | if (find_reg_note (insn, REG_EQUAL, NULL_RTX)) | |
1040 | return 0; | |
1041 | ||
eb9d8e4d JW |
1042 | /* For now treat an insn with a REG_RETVAL note as a |
1043 | a special insn which should not be considered a no-op. */ | |
1044 | if (find_reg_note (insn, REG_RETVAL, NULL_RTX)) | |
1045 | return 0; | |
1046 | ||
0005550b JH |
1047 | if (GET_CODE (pat) == SET && set_noop_p (pat)) |
1048 | return 1; | |
1049 | ||
1050 | if (GET_CODE (pat) == PARALLEL) | |
1051 | { | |
1052 | int i; | |
1053 | /* If nothing but SETs of registers to themselves, | |
1054 | this insn can also be deleted. */ | |
1055 | for (i = 0; i < XVECLEN (pat, 0); i++) | |
1056 | { | |
1057 | rtx tem = XVECEXP (pat, 0, i); | |
1058 | ||
1059 | if (GET_CODE (tem) == USE | |
1060 | || GET_CODE (tem) == CLOBBER) | |
1061 | continue; | |
1062 | ||
1063 | if (GET_CODE (tem) != SET || ! set_noop_p (tem)) | |
1064 | return 0; | |
1065 | } | |
1066 | ||
1067 | return 1; | |
1068 | } | |
1069 | return 0; | |
1070 | } | |
1071 | \f | |
7142e318 | 1072 | |
63be01fb JW |
1073 | /* Return the last thing that X was assigned from before *PINSN. If VALID_TO |
1074 | is not NULL_RTX then verify that the object is not modified up to VALID_TO. | |
1075 | If the object was modified, if we hit a partial assignment to X, or hit a | |
1076 | CODE_LABEL first, return X. If we found an assignment, update *PINSN to | |
1077 | point to it. ALLOW_HWREG is set to 1 if hardware registers are allowed to | |
1078 | be the src. */ | |
2c88418c RS |
1079 | |
1080 | rtx | |
0c20a65f | 1081 | find_last_value (rtx x, rtx *pinsn, rtx valid_to, int allow_hwreg) |
2c88418c RS |
1082 | { |
1083 | rtx p; | |
1084 | ||
4b4bf941 | 1085 | for (p = PREV_INSN (*pinsn); p && !LABEL_P (p); |
2c88418c | 1086 | p = PREV_INSN (p)) |
2c3c49de | 1087 | if (INSN_P (p)) |
2c88418c RS |
1088 | { |
1089 | rtx set = single_set (p); | |
c166a311 | 1090 | rtx note = find_reg_note (p, REG_EQUAL, NULL_RTX); |
2c88418c RS |
1091 | |
1092 | if (set && rtx_equal_p (x, SET_DEST (set))) | |
1093 | { | |
1094 | rtx src = SET_SRC (set); | |
1095 | ||
1096 | if (note && GET_CODE (XEXP (note, 0)) != EXPR_LIST) | |
1097 | src = XEXP (note, 0); | |
1098 | ||
63be01fb JW |
1099 | if ((valid_to == NULL_RTX |
1100 | || ! modified_between_p (src, PREV_INSN (p), valid_to)) | |
2c88418c RS |
1101 | /* Reject hard registers because we don't usually want |
1102 | to use them; we'd rather use a pseudo. */ | |
f8cfc6aa | 1103 | && (! (REG_P (src) |
89d3d442 | 1104 | && REGNO (src) < FIRST_PSEUDO_REGISTER) || allow_hwreg)) |
2c88418c RS |
1105 | { |
1106 | *pinsn = p; | |
1107 | return src; | |
1108 | } | |
1109 | } | |
a6a2274a | 1110 | |
2c88418c RS |
1111 | /* If set in non-simple way, we don't have a value. */ |
1112 | if (reg_set_p (x, p)) | |
1113 | break; | |
1114 | } | |
1115 | ||
1116 | return x; | |
a6a2274a | 1117 | } |
2c88418c RS |
1118 | \f |
1119 | /* Return nonzero if register in range [REGNO, ENDREGNO) | |
1120 | appears either explicitly or implicitly in X | |
1121 | other than being stored into. | |
1122 | ||
1123 | References contained within the substructure at LOC do not count. | |
1124 | LOC may be zero, meaning don't ignore anything. */ | |
1125 | ||
1126 | int | |
0c20a65f AJ |
1127 | refers_to_regno_p (unsigned int regno, unsigned int endregno, rtx x, |
1128 | rtx *loc) | |
2c88418c | 1129 | { |
770ae6cc RK |
1130 | int i; |
1131 | unsigned int x_regno; | |
1132 | RTX_CODE code; | |
1133 | const char *fmt; | |
2c88418c RS |
1134 | |
1135 | repeat: | |
1136 | /* The contents of a REG_NONNEG note is always zero, so we must come here | |
1137 | upon repeat in case the last REG_NOTE is a REG_NONNEG note. */ | |
1138 | if (x == 0) | |
1139 | return 0; | |
1140 | ||
1141 | code = GET_CODE (x); | |
1142 | ||
1143 | switch (code) | |
1144 | { | |
1145 | case REG: | |
770ae6cc | 1146 | x_regno = REGNO (x); |
f8163c92 RK |
1147 | |
1148 | /* If we modifying the stack, frame, or argument pointer, it will | |
1149 | clobber a virtual register. In fact, we could be more precise, | |
1150 | but it isn't worth it. */ | |
770ae6cc | 1151 | if ((x_regno == STACK_POINTER_REGNUM |
f8163c92 | 1152 | #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM |
770ae6cc | 1153 | || x_regno == ARG_POINTER_REGNUM |
f8163c92 | 1154 | #endif |
770ae6cc | 1155 | || x_regno == FRAME_POINTER_REGNUM) |
f8163c92 RK |
1156 | && regno >= FIRST_VIRTUAL_REGISTER && regno <= LAST_VIRTUAL_REGISTER) |
1157 | return 1; | |
1158 | ||
770ae6cc | 1159 | return (endregno > x_regno |
a6a2274a | 1160 | && regno < x_regno + (x_regno < FIRST_PSEUDO_REGISTER |
66fd46b6 | 1161 | ? hard_regno_nregs[x_regno][GET_MODE (x)] |
2c88418c RS |
1162 | : 1)); |
1163 | ||
1164 | case SUBREG: | |
1165 | /* If this is a SUBREG of a hard reg, we can see exactly which | |
1166 | registers are being modified. Otherwise, handle normally. */ | |
f8cfc6aa | 1167 | if (REG_P (SUBREG_REG (x)) |
2c88418c RS |
1168 | && REGNO (SUBREG_REG (x)) < FIRST_PSEUDO_REGISTER) |
1169 | { | |
ddef6bc7 | 1170 | unsigned int inner_regno = subreg_regno (x); |
770ae6cc | 1171 | unsigned int inner_endregno |
403c659c DE |
1172 | = inner_regno + (inner_regno < FIRST_PSEUDO_REGISTER |
1173 | ? hard_regno_nregs[inner_regno][GET_MODE (x)] : 1); | |
2c88418c RS |
1174 | |
1175 | return endregno > inner_regno && regno < inner_endregno; | |
1176 | } | |
1177 | break; | |
1178 | ||
1179 | case CLOBBER: | |
1180 | case SET: | |
1181 | if (&SET_DEST (x) != loc | |
1182 | /* Note setting a SUBREG counts as referring to the REG it is in for | |
1183 | a pseudo but not for hard registers since we can | |
1184 | treat each word individually. */ | |
1185 | && ((GET_CODE (SET_DEST (x)) == SUBREG | |
1186 | && loc != &SUBREG_REG (SET_DEST (x)) | |
f8cfc6aa | 1187 | && REG_P (SUBREG_REG (SET_DEST (x))) |
2c88418c RS |
1188 | && REGNO (SUBREG_REG (SET_DEST (x))) >= FIRST_PSEUDO_REGISTER |
1189 | && refers_to_regno_p (regno, endregno, | |
1190 | SUBREG_REG (SET_DEST (x)), loc)) | |
f8cfc6aa | 1191 | || (!REG_P (SET_DEST (x)) |
2c88418c RS |
1192 | && refers_to_regno_p (regno, endregno, SET_DEST (x), loc)))) |
1193 | return 1; | |
1194 | ||
1195 | if (code == CLOBBER || loc == &SET_SRC (x)) | |
1196 | return 0; | |
1197 | x = SET_SRC (x); | |
1198 | goto repeat; | |
e9a25f70 JL |
1199 | |
1200 | default: | |
1201 | break; | |
2c88418c RS |
1202 | } |
1203 | ||
1204 | /* X does not match, so try its subexpressions. */ | |
1205 | ||
1206 | fmt = GET_RTX_FORMAT (code); | |
1207 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
1208 | { | |
1209 | if (fmt[i] == 'e' && loc != &XEXP (x, i)) | |
1210 | { | |
1211 | if (i == 0) | |
1212 | { | |
1213 | x = XEXP (x, 0); | |
1214 | goto repeat; | |
1215 | } | |
1216 | else | |
1217 | if (refers_to_regno_p (regno, endregno, XEXP (x, i), loc)) | |
1218 | return 1; | |
1219 | } | |
1220 | else if (fmt[i] == 'E') | |
1221 | { | |
b3694847 | 1222 | int j; |
6a87d634 | 1223 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) |
2c88418c RS |
1224 | if (loc != &XVECEXP (x, i, j) |
1225 | && refers_to_regno_p (regno, endregno, XVECEXP (x, i, j), loc)) | |
1226 | return 1; | |
1227 | } | |
1228 | } | |
1229 | return 0; | |
1230 | } | |
1231 | ||
1232 | /* Nonzero if modifying X will affect IN. If X is a register or a SUBREG, | |
1233 | we check if any register number in X conflicts with the relevant register | |
1234 | numbers. If X is a constant, return 0. If X is a MEM, return 1 iff IN | |
1235 | contains a MEM (we don't bother checking for memory addresses that can't | |
1236 | conflict because we expect this to be a rare case. */ | |
1237 | ||
1238 | int | |
0c20a65f | 1239 | reg_overlap_mentioned_p (rtx x, rtx in) |
2c88418c | 1240 | { |
770ae6cc | 1241 | unsigned int regno, endregno; |
2c88418c | 1242 | |
6f626d1b PB |
1243 | /* If either argument is a constant, then modifying X can not |
1244 | affect IN. Here we look at IN, we can profitably combine | |
1245 | CONSTANT_P (x) with the switch statement below. */ | |
1246 | if (CONSTANT_P (in)) | |
b98b49ac | 1247 | return 0; |
0c99ec5c | 1248 | |
6f626d1b | 1249 | recurse: |
0c99ec5c | 1250 | switch (GET_CODE (x)) |
2c88418c | 1251 | { |
6f626d1b PB |
1252 | case STRICT_LOW_PART: |
1253 | case ZERO_EXTRACT: | |
1254 | case SIGN_EXTRACT: | |
1255 | /* Overly conservative. */ | |
1256 | x = XEXP (x, 0); | |
1257 | goto recurse; | |
1258 | ||
0c99ec5c | 1259 | case SUBREG: |
2c88418c RS |
1260 | regno = REGNO (SUBREG_REG (x)); |
1261 | if (regno < FIRST_PSEUDO_REGISTER) | |
ddef6bc7 | 1262 | regno = subreg_regno (x); |
0c99ec5c | 1263 | goto do_reg; |
2c88418c | 1264 | |
0c99ec5c RH |
1265 | case REG: |
1266 | regno = REGNO (x); | |
1267 | do_reg: | |
1268 | endregno = regno + (regno < FIRST_PSEUDO_REGISTER | |
66fd46b6 | 1269 | ? hard_regno_nregs[regno][GET_MODE (x)] : 1); |
8e2e89f7 | 1270 | return refers_to_regno_p (regno, endregno, in, (rtx*) 0); |
2c88418c | 1271 | |
0c99ec5c RH |
1272 | case MEM: |
1273 | { | |
1274 | const char *fmt; | |
1275 | int i; | |
2c88418c | 1276 | |
3c0cb5de | 1277 | if (MEM_P (in)) |
2c88418c RS |
1278 | return 1; |
1279 | ||
0c99ec5c RH |
1280 | fmt = GET_RTX_FORMAT (GET_CODE (in)); |
1281 | for (i = GET_RTX_LENGTH (GET_CODE (in)) - 1; i >= 0; i--) | |
3b009185 RH |
1282 | if (fmt[i] == 'e') |
1283 | { | |
1284 | if (reg_overlap_mentioned_p (x, XEXP (in, i))) | |
1285 | return 1; | |
1286 | } | |
1287 | else if (fmt[i] == 'E') | |
1288 | { | |
1289 | int j; | |
1290 | for (j = XVECLEN (in, i) - 1; j >= 0; --j) | |
1291 | if (reg_overlap_mentioned_p (x, XVECEXP (in, i, j))) | |
1292 | return 1; | |
1293 | } | |
c0222c21 | 1294 | |
0c99ec5c RH |
1295 | return 0; |
1296 | } | |
1297 | ||
1298 | case SCRATCH: | |
1299 | case PC: | |
1300 | case CC0: | |
1301 | return reg_mentioned_p (x, in); | |
1302 | ||
1303 | case PARALLEL: | |
37ceff9d | 1304 | { |
90d036a0 | 1305 | int i; |
37ceff9d RH |
1306 | |
1307 | /* If any register in here refers to it we return true. */ | |
7193d1dc RK |
1308 | for (i = XVECLEN (x, 0) - 1; i >= 0; i--) |
1309 | if (XEXP (XVECEXP (x, 0, i), 0) != 0 | |
1310 | && reg_overlap_mentioned_p (XEXP (XVECEXP (x, 0, i), 0), in)) | |
6f626d1b | 1311 | return 1; |
7193d1dc | 1312 | return 0; |
37ceff9d | 1313 | } |
2c88418c | 1314 | |
0c99ec5c | 1315 | default: |
41374e13 | 1316 | gcc_assert (CONSTANT_P (x)); |
6f626d1b PB |
1317 | return 0; |
1318 | } | |
2c88418c RS |
1319 | } |
1320 | \f | |
2c88418c RS |
1321 | /* Call FUN on each register or MEM that is stored into or clobbered by X. |
1322 | (X would be the pattern of an insn). | |
1323 | FUN receives two arguments: | |
1324 | the REG, MEM, CC0 or PC being stored in or clobbered, | |
1325 | the SET or CLOBBER rtx that does the store. | |
1326 | ||
1327 | If the item being stored in or clobbered is a SUBREG of a hard register, | |
1328 | the SUBREG will be passed. */ | |
a6a2274a | 1329 | |
2c88418c | 1330 | void |
0c20a65f | 1331 | note_stores (rtx x, void (*fun) (rtx, rtx, void *), void *data) |
2c88418c | 1332 | { |
90d036a0 RK |
1333 | int i; |
1334 | ||
0c99ec5c RH |
1335 | if (GET_CODE (x) == COND_EXEC) |
1336 | x = COND_EXEC_CODE (x); | |
90d036a0 | 1337 | |
0c99ec5c | 1338 | if (GET_CODE (x) == SET || GET_CODE (x) == CLOBBER) |
2c88418c | 1339 | { |
b3694847 | 1340 | rtx dest = SET_DEST (x); |
90d036a0 | 1341 | |
2c88418c | 1342 | while ((GET_CODE (dest) == SUBREG |
f8cfc6aa | 1343 | && (!REG_P (SUBREG_REG (dest)) |
2c88418c RS |
1344 | || REGNO (SUBREG_REG (dest)) >= FIRST_PSEUDO_REGISTER)) |
1345 | || GET_CODE (dest) == ZERO_EXTRACT | |
2c88418c RS |
1346 | || GET_CODE (dest) == STRICT_LOW_PART) |
1347 | dest = XEXP (dest, 0); | |
86465af7 | 1348 | |
7193d1dc | 1349 | /* If we have a PARALLEL, SET_DEST is a list of EXPR_LIST expressions, |
629111c7 | 1350 | each of whose first operand is a register. */ |
7193d1dc RK |
1351 | if (GET_CODE (dest) == PARALLEL) |
1352 | { | |
1353 | for (i = XVECLEN (dest, 0) - 1; i >= 0; i--) | |
1354 | if (XEXP (XVECEXP (dest, 0, i), 0) != 0) | |
629111c7 | 1355 | (*fun) (XEXP (XVECEXP (dest, 0, i), 0), x, data); |
7193d1dc | 1356 | } |
86465af7 | 1357 | else |
84832317 | 1358 | (*fun) (dest, x, data); |
2c88418c | 1359 | } |
770ae6cc | 1360 | |
90d036a0 RK |
1361 | else if (GET_CODE (x) == PARALLEL) |
1362 | for (i = XVECLEN (x, 0) - 1; i >= 0; i--) | |
1363 | note_stores (XVECEXP (x, 0, i), fun, data); | |
2c88418c RS |
1364 | } |
1365 | \f | |
e2373f95 RK |
1366 | /* Like notes_stores, but call FUN for each expression that is being |
1367 | referenced in PBODY, a pointer to the PATTERN of an insn. We only call | |
1368 | FUN for each expression, not any interior subexpressions. FUN receives a | |
1369 | pointer to the expression and the DATA passed to this function. | |
1370 | ||
1371 | Note that this is not quite the same test as that done in reg_referenced_p | |
1372 | since that considers something as being referenced if it is being | |
1373 | partially set, while we do not. */ | |
1374 | ||
1375 | void | |
0c20a65f | 1376 | note_uses (rtx *pbody, void (*fun) (rtx *, void *), void *data) |
e2373f95 RK |
1377 | { |
1378 | rtx body = *pbody; | |
1379 | int i; | |
1380 | ||
1381 | switch (GET_CODE (body)) | |
1382 | { | |
1383 | case COND_EXEC: | |
1384 | (*fun) (&COND_EXEC_TEST (body), data); | |
1385 | note_uses (&COND_EXEC_CODE (body), fun, data); | |
1386 | return; | |
1387 | ||
1388 | case PARALLEL: | |
1389 | for (i = XVECLEN (body, 0) - 1; i >= 0; i--) | |
1390 | note_uses (&XVECEXP (body, 0, i), fun, data); | |
1391 | return; | |
1392 | ||
bbbc206e BS |
1393 | case SEQUENCE: |
1394 | for (i = XVECLEN (body, 0) - 1; i >= 0; i--) | |
1395 | note_uses (&PATTERN (XVECEXP (body, 0, i)), fun, data); | |
1396 | return; | |
1397 | ||
e2373f95 RK |
1398 | case USE: |
1399 | (*fun) (&XEXP (body, 0), data); | |
1400 | return; | |
1401 | ||
1402 | case ASM_OPERANDS: | |
1403 | for (i = ASM_OPERANDS_INPUT_LENGTH (body) - 1; i >= 0; i--) | |
1404 | (*fun) (&ASM_OPERANDS_INPUT (body, i), data); | |
1405 | return; | |
1406 | ||
1407 | case TRAP_IF: | |
1408 | (*fun) (&TRAP_CONDITION (body), data); | |
1409 | return; | |
1410 | ||
21b8482a JJ |
1411 | case PREFETCH: |
1412 | (*fun) (&XEXP (body, 0), data); | |
1413 | return; | |
1414 | ||
e2373f95 RK |
1415 | case UNSPEC: |
1416 | case UNSPEC_VOLATILE: | |
1417 | for (i = XVECLEN (body, 0) - 1; i >= 0; i--) | |
1418 | (*fun) (&XVECEXP (body, 0, i), data); | |
1419 | return; | |
1420 | ||
1421 | case CLOBBER: | |
3c0cb5de | 1422 | if (MEM_P (XEXP (body, 0))) |
e2373f95 RK |
1423 | (*fun) (&XEXP (XEXP (body, 0), 0), data); |
1424 | return; | |
1425 | ||
1426 | case SET: | |
1427 | { | |
1428 | rtx dest = SET_DEST (body); | |
1429 | ||
1430 | /* For sets we replace everything in source plus registers in memory | |
1431 | expression in store and operands of a ZERO_EXTRACT. */ | |
1432 | (*fun) (&SET_SRC (body), data); | |
1433 | ||
1434 | if (GET_CODE (dest) == ZERO_EXTRACT) | |
1435 | { | |
1436 | (*fun) (&XEXP (dest, 1), data); | |
1437 | (*fun) (&XEXP (dest, 2), data); | |
1438 | } | |
1439 | ||
1440 | while (GET_CODE (dest) == SUBREG || GET_CODE (dest) == STRICT_LOW_PART) | |
1441 | dest = XEXP (dest, 0); | |
1442 | ||
3c0cb5de | 1443 | if (MEM_P (dest)) |
e2373f95 RK |
1444 | (*fun) (&XEXP (dest, 0), data); |
1445 | } | |
1446 | return; | |
1447 | ||
1448 | default: | |
1449 | /* All the other possibilities never store. */ | |
1450 | (*fun) (pbody, data); | |
1451 | return; | |
1452 | } | |
1453 | } | |
1454 | \f | |
2c88418c RS |
1455 | /* Return nonzero if X's old contents don't survive after INSN. |
1456 | This will be true if X is (cc0) or if X is a register and | |
1457 | X dies in INSN or because INSN entirely sets X. | |
1458 | ||
46d096a3 SB |
1459 | "Entirely set" means set directly and not through a SUBREG, or |
1460 | ZERO_EXTRACT, so no trace of the old contents remains. | |
2c88418c RS |
1461 | Likewise, REG_INC does not count. |
1462 | ||
1463 | REG may be a hard or pseudo reg. Renumbering is not taken into account, | |
1464 | but for this use that makes no difference, since regs don't overlap | |
1465 | during their lifetimes. Therefore, this function may be used | |
1466 | at any time after deaths have been computed (in flow.c). | |
1467 | ||
1468 | If REG is a hard reg that occupies multiple machine registers, this | |
1469 | function will only return 1 if each of those registers will be replaced | |
1470 | by INSN. */ | |
1471 | ||
1472 | int | |
0c20a65f | 1473 | dead_or_set_p (rtx insn, rtx x) |
2c88418c | 1474 | { |
770ae6cc RK |
1475 | unsigned int regno, last_regno; |
1476 | unsigned int i; | |
2c88418c RS |
1477 | |
1478 | /* Can't use cc0_rtx below since this file is used by genattrtab.c. */ | |
1479 | if (GET_CODE (x) == CC0) | |
1480 | return 1; | |
1481 | ||
41374e13 | 1482 | gcc_assert (REG_P (x)); |
2c88418c RS |
1483 | |
1484 | regno = REGNO (x); | |
1485 | last_regno = (regno >= FIRST_PSEUDO_REGISTER ? regno | |
66fd46b6 | 1486 | : regno + hard_regno_nregs[regno][GET_MODE (x)] - 1); |
2c88418c RS |
1487 | |
1488 | for (i = regno; i <= last_regno; i++) | |
1489 | if (! dead_or_set_regno_p (insn, i)) | |
1490 | return 0; | |
1491 | ||
1492 | return 1; | |
1493 | } | |
1494 | ||
194acded HPN |
1495 | /* Return TRUE iff DEST is a register or subreg of a register and |
1496 | doesn't change the number of words of the inner register, and any | |
1497 | part of the register is TEST_REGNO. */ | |
1498 | ||
1499 | static bool | |
1500 | covers_regno_no_parallel_p (rtx dest, unsigned int test_regno) | |
1501 | { | |
1502 | unsigned int regno, endregno; | |
1503 | ||
1504 | if (GET_CODE (dest) == SUBREG | |
1505 | && (((GET_MODE_SIZE (GET_MODE (dest)) | |
1506 | + UNITS_PER_WORD - 1) / UNITS_PER_WORD) | |
1507 | == ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (dest))) | |
1508 | + UNITS_PER_WORD - 1) / UNITS_PER_WORD))) | |
1509 | dest = SUBREG_REG (dest); | |
1510 | ||
1511 | if (!REG_P (dest)) | |
1512 | return false; | |
1513 | ||
1514 | regno = REGNO (dest); | |
1515 | endregno = (regno >= FIRST_PSEUDO_REGISTER ? regno + 1 | |
1516 | : regno + hard_regno_nregs[regno][GET_MODE (dest)]); | |
1517 | return (test_regno >= regno && test_regno < endregno); | |
1518 | } | |
1519 | ||
1520 | /* Like covers_regno_no_parallel_p, but also handles PARALLELs where | |
1521 | any member matches the covers_regno_no_parallel_p criteria. */ | |
1522 | ||
1523 | static bool | |
1524 | covers_regno_p (rtx dest, unsigned int test_regno) | |
1525 | { | |
1526 | if (GET_CODE (dest) == PARALLEL) | |
1527 | { | |
1528 | /* Some targets place small structures in registers for return | |
1529 | values of functions, and those registers are wrapped in | |
1530 | PARALLELs that we may see as the destination of a SET. */ | |
1531 | int i; | |
1532 | ||
1533 | for (i = XVECLEN (dest, 0) - 1; i >= 0; i--) | |
1534 | { | |
1535 | rtx inner = XEXP (XVECEXP (dest, 0, i), 0); | |
1536 | if (inner != NULL_RTX | |
1537 | && covers_regno_no_parallel_p (inner, test_regno)) | |
1538 | return true; | |
1539 | } | |
1540 | ||
1541 | return false; | |
1542 | } | |
1543 | else | |
1544 | return covers_regno_no_parallel_p (dest, test_regno); | |
1545 | } | |
1546 | ||
2c88418c RS |
1547 | /* Utility function for dead_or_set_p to check an individual register. Also |
1548 | called from flow.c. */ | |
1549 | ||
1550 | int | |
0c20a65f | 1551 | dead_or_set_regno_p (rtx insn, unsigned int test_regno) |
2c88418c | 1552 | { |
8c8de5fc | 1553 | rtx pattern; |
2c88418c | 1554 | |
0a2287bf RH |
1555 | /* See if there is a death note for something that includes TEST_REGNO. */ |
1556 | if (find_regno_note (insn, REG_DEAD, test_regno)) | |
1557 | return 1; | |
2c88418c | 1558 | |
4b4bf941 | 1559 | if (CALL_P (insn) |
8f3e7a26 RK |
1560 | && find_regno_fusage (insn, CLOBBER, test_regno)) |
1561 | return 1; | |
1562 | ||
0c99ec5c RH |
1563 | pattern = PATTERN (insn); |
1564 | ||
1565 | if (GET_CODE (pattern) == COND_EXEC) | |
1566 | pattern = COND_EXEC_CODE (pattern); | |
1567 | ||
1568 | if (GET_CODE (pattern) == SET) | |
194acded | 1569 | return covers_regno_p (SET_DEST (pattern), test_regno); |
0c99ec5c | 1570 | else if (GET_CODE (pattern) == PARALLEL) |
2c88418c | 1571 | { |
b3694847 | 1572 | int i; |
2c88418c | 1573 | |
0c99ec5c | 1574 | for (i = XVECLEN (pattern, 0) - 1; i >= 0; i--) |
2c88418c | 1575 | { |
0c99ec5c RH |
1576 | rtx body = XVECEXP (pattern, 0, i); |
1577 | ||
1578 | if (GET_CODE (body) == COND_EXEC) | |
1579 | body = COND_EXEC_CODE (body); | |
2c88418c | 1580 | |
194acded HPN |
1581 | if ((GET_CODE (body) == SET || GET_CODE (body) == CLOBBER) |
1582 | && covers_regno_p (SET_DEST (body), test_regno)) | |
1583 | return 1; | |
2c88418c RS |
1584 | } |
1585 | } | |
1586 | ||
1587 | return 0; | |
1588 | } | |
1589 | ||
1590 | /* Return the reg-note of kind KIND in insn INSN, if there is one. | |
1591 | If DATUM is nonzero, look for one whose datum is DATUM. */ | |
1592 | ||
1593 | rtx | |
0c20a65f | 1594 | find_reg_note (rtx insn, enum reg_note kind, rtx datum) |
2c88418c | 1595 | { |
b3694847 | 1596 | rtx link; |
2c88418c | 1597 | |
af082de3 BE |
1598 | gcc_assert (insn); |
1599 | ||
ae78d276 | 1600 | /* Ignore anything that is not an INSN, JUMP_INSN or CALL_INSN. */ |
2c3c49de | 1601 | if (! INSN_P (insn)) |
ae78d276 | 1602 | return 0; |
cd798543 AP |
1603 | if (datum == 0) |
1604 | { | |
1605 | for (link = REG_NOTES (insn); link; link = XEXP (link, 1)) | |
1606 | if (REG_NOTE_KIND (link) == kind) | |
1607 | return link; | |
1608 | return 0; | |
1609 | } | |
ae78d276 | 1610 | |
2c88418c | 1611 | for (link = REG_NOTES (insn); link; link = XEXP (link, 1)) |
cd798543 | 1612 | if (REG_NOTE_KIND (link) == kind && datum == XEXP (link, 0)) |
2c88418c RS |
1613 | return link; |
1614 | return 0; | |
1615 | } | |
1616 | ||
1617 | /* Return the reg-note of kind KIND in insn INSN which applies to register | |
99309f3b RK |
1618 | number REGNO, if any. Return 0 if there is no such reg-note. Note that |
1619 | the REGNO of this NOTE need not be REGNO if REGNO is a hard register; | |
1620 | it might be the case that the note overlaps REGNO. */ | |
2c88418c RS |
1621 | |
1622 | rtx | |
0c20a65f | 1623 | find_regno_note (rtx insn, enum reg_note kind, unsigned int regno) |
2c88418c | 1624 | { |
b3694847 | 1625 | rtx link; |
2c88418c | 1626 | |
ae78d276 | 1627 | /* Ignore anything that is not an INSN, JUMP_INSN or CALL_INSN. */ |
2c3c49de | 1628 | if (! INSN_P (insn)) |
ae78d276 MM |
1629 | return 0; |
1630 | ||
2c88418c RS |
1631 | for (link = REG_NOTES (insn); link; link = XEXP (link, 1)) |
1632 | if (REG_NOTE_KIND (link) == kind | |
1633 | /* Verify that it is a register, so that scratch and MEM won't cause a | |
1634 | problem here. */ | |
f8cfc6aa | 1635 | && REG_P (XEXP (link, 0)) |
99309f3b RK |
1636 | && REGNO (XEXP (link, 0)) <= regno |
1637 | && ((REGNO (XEXP (link, 0)) | |
1638 | + (REGNO (XEXP (link, 0)) >= FIRST_PSEUDO_REGISTER ? 1 | |
66fd46b6 JH |
1639 | : hard_regno_nregs[REGNO (XEXP (link, 0))] |
1640 | [GET_MODE (XEXP (link, 0))])) | |
99309f3b | 1641 | > regno)) |
2c88418c RS |
1642 | return link; |
1643 | return 0; | |
1644 | } | |
8f3e7a26 | 1645 | |
d9c695ff RK |
1646 | /* Return a REG_EQUIV or REG_EQUAL note if insn has only a single set and |
1647 | has such a note. */ | |
1648 | ||
1649 | rtx | |
0c20a65f | 1650 | find_reg_equal_equiv_note (rtx insn) |
d9c695ff | 1651 | { |
cd648cec | 1652 | rtx link; |
d9c695ff | 1653 | |
cd648cec | 1654 | if (!INSN_P (insn)) |
d9c695ff | 1655 | return 0; |
cd648cec JH |
1656 | for (link = REG_NOTES (insn); link; link = XEXP (link, 1)) |
1657 | if (REG_NOTE_KIND (link) == REG_EQUAL | |
1658 | || REG_NOTE_KIND (link) == REG_EQUIV) | |
1659 | { | |
1660 | if (single_set (insn) == 0) | |
1661 | return 0; | |
1662 | return link; | |
1663 | } | |
1664 | return NULL; | |
d9c695ff RK |
1665 | } |
1666 | ||
8f3e7a26 RK |
1667 | /* Return true if DATUM, or any overlap of DATUM, of kind CODE is found |
1668 | in the CALL_INSN_FUNCTION_USAGE information of INSN. */ | |
1669 | ||
1670 | int | |
0c20a65f | 1671 | find_reg_fusage (rtx insn, enum rtx_code code, rtx datum) |
8f3e7a26 RK |
1672 | { |
1673 | /* If it's not a CALL_INSN, it can't possibly have a | |
1674 | CALL_INSN_FUNCTION_USAGE field, so don't bother checking. */ | |
4b4bf941 | 1675 | if (!CALL_P (insn)) |
8f3e7a26 RK |
1676 | return 0; |
1677 | ||
41374e13 | 1678 | gcc_assert (datum); |
8f3e7a26 | 1679 | |
f8cfc6aa | 1680 | if (!REG_P (datum)) |
8f3e7a26 | 1681 | { |
b3694847 | 1682 | rtx link; |
8f3e7a26 RK |
1683 | |
1684 | for (link = CALL_INSN_FUNCTION_USAGE (insn); | |
a6a2274a | 1685 | link; |
8f3e7a26 | 1686 | link = XEXP (link, 1)) |
a6a2274a | 1687 | if (GET_CODE (XEXP (link, 0)) == code |
cc863bea | 1688 | && rtx_equal_p (datum, XEXP (XEXP (link, 0), 0))) |
a6a2274a | 1689 | return 1; |
8f3e7a26 RK |
1690 | } |
1691 | else | |
1692 | { | |
770ae6cc | 1693 | unsigned int regno = REGNO (datum); |
8f3e7a26 RK |
1694 | |
1695 | /* CALL_INSN_FUNCTION_USAGE information cannot contain references | |
1696 | to pseudo registers, so don't bother checking. */ | |
1697 | ||
1698 | if (regno < FIRST_PSEUDO_REGISTER) | |
a6a2274a | 1699 | { |
770ae6cc | 1700 | unsigned int end_regno |
66fd46b6 | 1701 | = regno + hard_regno_nregs[regno][GET_MODE (datum)]; |
770ae6cc | 1702 | unsigned int i; |
8f3e7a26 RK |
1703 | |
1704 | for (i = regno; i < end_regno; i++) | |
1705 | if (find_regno_fusage (insn, code, i)) | |
1706 | return 1; | |
a6a2274a | 1707 | } |
8f3e7a26 RK |
1708 | } |
1709 | ||
1710 | return 0; | |
1711 | } | |
1712 | ||
1713 | /* Return true if REGNO, or any overlap of REGNO, of kind CODE is found | |
1714 | in the CALL_INSN_FUNCTION_USAGE information of INSN. */ | |
1715 | ||
1716 | int | |
0c20a65f | 1717 | find_regno_fusage (rtx insn, enum rtx_code code, unsigned int regno) |
8f3e7a26 | 1718 | { |
b3694847 | 1719 | rtx link; |
8f3e7a26 RK |
1720 | |
1721 | /* CALL_INSN_FUNCTION_USAGE information cannot contain references | |
1722 | to pseudo registers, so don't bother checking. */ | |
1723 | ||
1724 | if (regno >= FIRST_PSEUDO_REGISTER | |
4b4bf941 | 1725 | || !CALL_P (insn) ) |
8f3e7a26 RK |
1726 | return 0; |
1727 | ||
1728 | for (link = CALL_INSN_FUNCTION_USAGE (insn); link; link = XEXP (link, 1)) | |
83ab3839 | 1729 | { |
770ae6cc RK |
1730 | unsigned int regnote; |
1731 | rtx op, reg; | |
83ab3839 RH |
1732 | |
1733 | if (GET_CODE (op = XEXP (link, 0)) == code | |
f8cfc6aa | 1734 | && REG_P (reg = XEXP (op, 0)) |
83ab3839 | 1735 | && (regnote = REGNO (reg)) <= regno |
66fd46b6 | 1736 | && regnote + hard_regno_nregs[regnote][GET_MODE (reg)] > regno) |
83ab3839 RH |
1737 | return 1; |
1738 | } | |
8f3e7a26 RK |
1739 | |
1740 | return 0; | |
1741 | } | |
a6a063b8 AM |
1742 | |
1743 | /* Return true if INSN is a call to a pure function. */ | |
1744 | ||
1745 | int | |
0c20a65f | 1746 | pure_call_p (rtx insn) |
a6a063b8 AM |
1747 | { |
1748 | rtx link; | |
1749 | ||
4b4bf941 | 1750 | if (!CALL_P (insn) || ! CONST_OR_PURE_CALL_P (insn)) |
a6a063b8 AM |
1751 | return 0; |
1752 | ||
1753 | /* Look for the note that differentiates const and pure functions. */ | |
1754 | for (link = CALL_INSN_FUNCTION_USAGE (insn); link; link = XEXP (link, 1)) | |
1755 | { | |
1756 | rtx u, m; | |
1757 | ||
1758 | if (GET_CODE (u = XEXP (link, 0)) == USE | |
3c0cb5de | 1759 | && MEM_P (m = XEXP (u, 0)) && GET_MODE (m) == BLKmode |
a6a063b8 AM |
1760 | && GET_CODE (XEXP (m, 0)) == SCRATCH) |
1761 | return 1; | |
1762 | } | |
1763 | ||
1764 | return 0; | |
1765 | } | |
2c88418c RS |
1766 | \f |
1767 | /* Remove register note NOTE from the REG_NOTES of INSN. */ | |
1768 | ||
1769 | void | |
0c20a65f | 1770 | remove_note (rtx insn, rtx note) |
2c88418c | 1771 | { |
b3694847 | 1772 | rtx link; |
2c88418c | 1773 | |
49c3bb12 RH |
1774 | if (note == NULL_RTX) |
1775 | return; | |
1776 | ||
2c88418c RS |
1777 | if (REG_NOTES (insn) == note) |
1778 | { | |
1779 | REG_NOTES (insn) = XEXP (note, 1); | |
1780 | return; | |
1781 | } | |
1782 | ||
1783 | for (link = REG_NOTES (insn); link; link = XEXP (link, 1)) | |
1784 | if (XEXP (link, 1) == note) | |
1785 | { | |
1786 | XEXP (link, 1) = XEXP (note, 1); | |
1787 | return; | |
1788 | } | |
1789 | ||
41374e13 | 1790 | gcc_unreachable (); |
2c88418c | 1791 | } |
55a98783 | 1792 | |
5f0d2358 RK |
1793 | /* Search LISTP (an EXPR_LIST) for an entry whose first operand is NODE and |
1794 | return 1 if it is found. A simple equality test is used to determine if | |
1795 | NODE matches. */ | |
1796 | ||
1797 | int | |
0c20a65f | 1798 | in_expr_list_p (rtx listp, rtx node) |
5f0d2358 RK |
1799 | { |
1800 | rtx x; | |
1801 | ||
1802 | for (x = listp; x; x = XEXP (x, 1)) | |
1803 | if (node == XEXP (x, 0)) | |
1804 | return 1; | |
1805 | ||
1806 | return 0; | |
1807 | } | |
1808 | ||
dd248abd RK |
1809 | /* Search LISTP (an EXPR_LIST) for an entry whose first operand is NODE and |
1810 | remove that entry from the list if it is found. | |
55a98783 | 1811 | |
dd248abd | 1812 | A simple equality test is used to determine if NODE matches. */ |
55a98783 JL |
1813 | |
1814 | void | |
0c20a65f | 1815 | remove_node_from_expr_list (rtx node, rtx *listp) |
55a98783 JL |
1816 | { |
1817 | rtx temp = *listp; | |
1818 | rtx prev = NULL_RTX; | |
1819 | ||
1820 | while (temp) | |
1821 | { | |
1822 | if (node == XEXP (temp, 0)) | |
1823 | { | |
1824 | /* Splice the node out of the list. */ | |
1825 | if (prev) | |
1826 | XEXP (prev, 1) = XEXP (temp, 1); | |
1827 | else | |
1828 | *listp = XEXP (temp, 1); | |
1829 | ||
1830 | return; | |
1831 | } | |
dd248abd RK |
1832 | |
1833 | prev = temp; | |
55a98783 JL |
1834 | temp = XEXP (temp, 1); |
1835 | } | |
1836 | } | |
2c88418c | 1837 | \f |
2b067faf RS |
1838 | /* Nonzero if X contains any volatile instructions. These are instructions |
1839 | which may cause unpredictable machine state instructions, and thus no | |
1840 | instructions should be moved or combined across them. This includes | |
1841 | only volatile asms and UNSPEC_VOLATILE instructions. */ | |
1842 | ||
1843 | int | |
0c20a65f | 1844 | volatile_insn_p (rtx x) |
2b067faf | 1845 | { |
b3694847 | 1846 | RTX_CODE code; |
2b067faf RS |
1847 | |
1848 | code = GET_CODE (x); | |
1849 | switch (code) | |
1850 | { | |
1851 | case LABEL_REF: | |
1852 | case SYMBOL_REF: | |
1853 | case CONST_INT: | |
1854 | case CONST: | |
1855 | case CONST_DOUBLE: | |
69ef87e2 | 1856 | case CONST_VECTOR: |
2b067faf RS |
1857 | case CC0: |
1858 | case PC: | |
1859 | case REG: | |
1860 | case SCRATCH: | |
1861 | case CLOBBER: | |
2b067faf RS |
1862 | case ADDR_VEC: |
1863 | case ADDR_DIFF_VEC: | |
1864 | case CALL: | |
1865 | case MEM: | |
1866 | return 0; | |
1867 | ||
1868 | case UNSPEC_VOLATILE: | |
1869 | /* case TRAP_IF: This isn't clear yet. */ | |
1870 | return 1; | |
1871 | ||
4c46ea23 | 1872 | case ASM_INPUT: |
2b067faf RS |
1873 | case ASM_OPERANDS: |
1874 | if (MEM_VOLATILE_P (x)) | |
1875 | return 1; | |
e9a25f70 JL |
1876 | |
1877 | default: | |
1878 | break; | |
2b067faf RS |
1879 | } |
1880 | ||
1881 | /* Recursively scan the operands of this expression. */ | |
1882 | ||
1883 | { | |
b3694847 SS |
1884 | const char *fmt = GET_RTX_FORMAT (code); |
1885 | int i; | |
a6a2274a | 1886 | |
2b067faf RS |
1887 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) |
1888 | { | |
1889 | if (fmt[i] == 'e') | |
1890 | { | |
31001f72 | 1891 | if (volatile_insn_p (XEXP (x, i))) |
2b067faf RS |
1892 | return 1; |
1893 | } | |
d4757e6a | 1894 | else if (fmt[i] == 'E') |
2b067faf | 1895 | { |
b3694847 | 1896 | int j; |
2b067faf | 1897 | for (j = 0; j < XVECLEN (x, i); j++) |
31001f72 | 1898 | if (volatile_insn_p (XVECEXP (x, i, j))) |
2b067faf RS |
1899 | return 1; |
1900 | } | |
1901 | } | |
1902 | } | |
1903 | return 0; | |
1904 | } | |
1905 | ||
2c88418c | 1906 | /* Nonzero if X contains any volatile memory references |
2ac4fed0 | 1907 | UNSPEC_VOLATILE operations or volatile ASM_OPERANDS expressions. */ |
2c88418c RS |
1908 | |
1909 | int | |
0c20a65f | 1910 | volatile_refs_p (rtx x) |
2c88418c | 1911 | { |
b3694847 | 1912 | RTX_CODE code; |
2c88418c RS |
1913 | |
1914 | code = GET_CODE (x); | |
1915 | switch (code) | |
1916 | { | |
1917 | case LABEL_REF: | |
1918 | case SYMBOL_REF: | |
1919 | case CONST_INT: | |
1920 | case CONST: | |
1921 | case CONST_DOUBLE: | |
69ef87e2 | 1922 | case CONST_VECTOR: |
2c88418c RS |
1923 | case CC0: |
1924 | case PC: | |
1925 | case REG: | |
1926 | case SCRATCH: | |
1927 | case CLOBBER: | |
2c88418c RS |
1928 | case ADDR_VEC: |
1929 | case ADDR_DIFF_VEC: | |
1930 | return 0; | |
1931 | ||
2ac4fed0 | 1932 | case UNSPEC_VOLATILE: |
2c88418c RS |
1933 | return 1; |
1934 | ||
1935 | case MEM: | |
4c46ea23 | 1936 | case ASM_INPUT: |
2c88418c RS |
1937 | case ASM_OPERANDS: |
1938 | if (MEM_VOLATILE_P (x)) | |
1939 | return 1; | |
e9a25f70 JL |
1940 | |
1941 | default: | |
1942 | break; | |
2c88418c RS |
1943 | } |
1944 | ||
1945 | /* Recursively scan the operands of this expression. */ | |
1946 | ||
1947 | { | |
b3694847 SS |
1948 | const char *fmt = GET_RTX_FORMAT (code); |
1949 | int i; | |
a6a2274a | 1950 | |
2c88418c RS |
1951 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) |
1952 | { | |
1953 | if (fmt[i] == 'e') | |
1954 | { | |
1955 | if (volatile_refs_p (XEXP (x, i))) | |
1956 | return 1; | |
1957 | } | |
d4757e6a | 1958 | else if (fmt[i] == 'E') |
2c88418c | 1959 | { |
b3694847 | 1960 | int j; |
2c88418c RS |
1961 | for (j = 0; j < XVECLEN (x, i); j++) |
1962 | if (volatile_refs_p (XVECEXP (x, i, j))) | |
1963 | return 1; | |
1964 | } | |
1965 | } | |
1966 | } | |
1967 | return 0; | |
1968 | } | |
1969 | ||
1970 | /* Similar to above, except that it also rejects register pre- and post- | |
1971 | incrementing. */ | |
1972 | ||
1973 | int | |
0c20a65f | 1974 | side_effects_p (rtx x) |
2c88418c | 1975 | { |
b3694847 | 1976 | RTX_CODE code; |
2c88418c RS |
1977 | |
1978 | code = GET_CODE (x); | |
1979 | switch (code) | |
1980 | { | |
1981 | case LABEL_REF: | |
1982 | case SYMBOL_REF: | |
1983 | case CONST_INT: | |
1984 | case CONST: | |
1985 | case CONST_DOUBLE: | |
69ef87e2 | 1986 | case CONST_VECTOR: |
2c88418c RS |
1987 | case CC0: |
1988 | case PC: | |
1989 | case REG: | |
1990 | case SCRATCH: | |
2c88418c RS |
1991 | case ADDR_VEC: |
1992 | case ADDR_DIFF_VEC: | |
1993 | return 0; | |
1994 | ||
1995 | case CLOBBER: | |
1996 | /* Reject CLOBBER with a non-VOID mode. These are made by combine.c | |
1997 | when some combination can't be done. If we see one, don't think | |
1998 | that we can simplify the expression. */ | |
1999 | return (GET_MODE (x) != VOIDmode); | |
2000 | ||
2001 | case PRE_INC: | |
2002 | case PRE_DEC: | |
2003 | case POST_INC: | |
2004 | case POST_DEC: | |
1fb9c5cd MH |
2005 | case PRE_MODIFY: |
2006 | case POST_MODIFY: | |
2c88418c | 2007 | case CALL: |
2ac4fed0 | 2008 | case UNSPEC_VOLATILE: |
2c88418c RS |
2009 | /* case TRAP_IF: This isn't clear yet. */ |
2010 | return 1; | |
2011 | ||
2012 | case MEM: | |
4c46ea23 | 2013 | case ASM_INPUT: |
2c88418c RS |
2014 | case ASM_OPERANDS: |
2015 | if (MEM_VOLATILE_P (x)) | |
2016 | return 1; | |
e9a25f70 JL |
2017 | |
2018 | default: | |
2019 | break; | |
2c88418c RS |
2020 | } |
2021 | ||
2022 | /* Recursively scan the operands of this expression. */ | |
2023 | ||
2024 | { | |
b3694847 SS |
2025 | const char *fmt = GET_RTX_FORMAT (code); |
2026 | int i; | |
a6a2274a | 2027 | |
2c88418c RS |
2028 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) |
2029 | { | |
2030 | if (fmt[i] == 'e') | |
2031 | { | |
2032 | if (side_effects_p (XEXP (x, i))) | |
2033 | return 1; | |
2034 | } | |
d4757e6a | 2035 | else if (fmt[i] == 'E') |
2c88418c | 2036 | { |
b3694847 | 2037 | int j; |
2c88418c RS |
2038 | for (j = 0; j < XVECLEN (x, i); j++) |
2039 | if (side_effects_p (XVECEXP (x, i, j))) | |
2040 | return 1; | |
2041 | } | |
2042 | } | |
2043 | } | |
2044 | return 0; | |
2045 | } | |
2046 | \f | |
e755fcf5 ZD |
2047 | enum may_trap_p_flags |
2048 | { | |
2049 | MTP_UNALIGNED_MEMS = 1, | |
2050 | MTP_AFTER_MOVE = 2 | |
2051 | }; | |
2052 | /* Return nonzero if evaluating rtx X might cause a trap. | |
2053 | (FLAGS & MTP_UNALIGNED_MEMS) controls whether nonzero is returned for | |
2054 | unaligned memory accesses on strict alignment machines. If | |
2055 | (FLAGS & AFTER_MOVE) is true, returns nonzero even in case the expression | |
2056 | cannot trap at its current location, but it might become trapping if moved | |
2057 | elsewhere. */ | |
2c88418c | 2058 | |
2358ff91 | 2059 | static int |
e755fcf5 | 2060 | may_trap_p_1 (rtx x, unsigned flags) |
2c88418c RS |
2061 | { |
2062 | int i; | |
2063 | enum rtx_code code; | |
6f7d635c | 2064 | const char *fmt; |
e755fcf5 | 2065 | bool unaligned_mems = (flags & MTP_UNALIGNED_MEMS) != 0; |
2c88418c RS |
2066 | |
2067 | if (x == 0) | |
2068 | return 0; | |
2069 | code = GET_CODE (x); | |
2070 | switch (code) | |
2071 | { | |
2072 | /* Handle these cases quickly. */ | |
2073 | case CONST_INT: | |
2074 | case CONST_DOUBLE: | |
69ef87e2 | 2075 | case CONST_VECTOR: |
2c88418c RS |
2076 | case SYMBOL_REF: |
2077 | case LABEL_REF: | |
2078 | case CONST: | |
2079 | case PC: | |
2080 | case CC0: | |
2081 | case REG: | |
2082 | case SCRATCH: | |
2083 | return 0; | |
2084 | ||
22aa60a1 | 2085 | case ASM_INPUT: |
2ac4fed0 | 2086 | case UNSPEC_VOLATILE: |
2c88418c RS |
2087 | case TRAP_IF: |
2088 | return 1; | |
2089 | ||
22aa60a1 RH |
2090 | case ASM_OPERANDS: |
2091 | return MEM_VOLATILE_P (x); | |
2092 | ||
2c88418c RS |
2093 | /* Memory ref can trap unless it's a static var or a stack slot. */ |
2094 | case MEM: | |
e755fcf5 ZD |
2095 | if (/* MEM_NOTRAP_P only relates to the actual position of the memory |
2096 | reference; moving it out of condition might cause its address | |
2097 | become invalid. */ | |
2098 | !(flags & MTP_AFTER_MOVE) | |
2099 | && MEM_NOTRAP_P (x) | |
2358ff91 | 2100 | && (!STRICT_ALIGNMENT || !unaligned_mems)) |
4da2eb6b | 2101 | return 0; |
2358ff91 EB |
2102 | return |
2103 | rtx_addr_can_trap_p_1 (XEXP (x, 0), GET_MODE (x), unaligned_mems); | |
2c88418c RS |
2104 | |
2105 | /* Division by a non-constant might trap. */ | |
2106 | case DIV: | |
2107 | case MOD: | |
2108 | case UDIV: | |
2109 | case UMOD: | |
52bfebf0 RS |
2110 | if (HONOR_SNANS (GET_MODE (x))) |
2111 | return 1; | |
3d8bf70f | 2112 | if (SCALAR_FLOAT_MODE_P (GET_MODE (x))) |
f9013075 DE |
2113 | return flag_trapping_math; |
2114 | if (!CONSTANT_P (XEXP (x, 1)) || (XEXP (x, 1) == const0_rtx)) | |
2c88418c | 2115 | return 1; |
e9a25f70 JL |
2116 | break; |
2117 | ||
b278301b RK |
2118 | case EXPR_LIST: |
2119 | /* An EXPR_LIST is used to represent a function call. This | |
2120 | certainly may trap. */ | |
2121 | return 1; | |
e9a25f70 | 2122 | |
734508ea JW |
2123 | case GE: |
2124 | case GT: | |
2125 | case LE: | |
2126 | case LT: | |
19aec195 | 2127 | case LTGT: |
55143861 | 2128 | case COMPARE: |
734508ea | 2129 | /* Some floating point comparisons may trap. */ |
f5eb5fd0 JH |
2130 | if (!flag_trapping_math) |
2131 | break; | |
734508ea JW |
2132 | /* ??? There is no machine independent way to check for tests that trap |
2133 | when COMPARE is used, though many targets do make this distinction. | |
2134 | For instance, sparc uses CCFPE for compares which generate exceptions | |
2135 | and CCFP for compares which do not generate exceptions. */ | |
52bfebf0 | 2136 | if (HONOR_NANS (GET_MODE (x))) |
55143861 JJ |
2137 | return 1; |
2138 | /* But often the compare has some CC mode, so check operand | |
2139 | modes as well. */ | |
52bfebf0 RS |
2140 | if (HONOR_NANS (GET_MODE (XEXP (x, 0))) |
2141 | || HONOR_NANS (GET_MODE (XEXP (x, 1)))) | |
2142 | return 1; | |
2143 | break; | |
2144 | ||
2145 | case EQ: | |
2146 | case NE: | |
2147 | if (HONOR_SNANS (GET_MODE (x))) | |
2148 | return 1; | |
2149 | /* Often comparison is CC mode, so check operand modes. */ | |
2150 | if (HONOR_SNANS (GET_MODE (XEXP (x, 0))) | |
2151 | || HONOR_SNANS (GET_MODE (XEXP (x, 1)))) | |
55143861 JJ |
2152 | return 1; |
2153 | break; | |
2154 | ||
22fd5743 FH |
2155 | case FIX: |
2156 | /* Conversion of floating point might trap. */ | |
2157 | if (flag_trapping_math && HONOR_NANS (GET_MODE (XEXP (x, 0)))) | |
2158 | return 1; | |
2159 | break; | |
2160 | ||
05cc23e8 RH |
2161 | case NEG: |
2162 | case ABS: | |
e3947b34 | 2163 | case SUBREG: |
05cc23e8 RH |
2164 | /* These operations don't trap even with floating point. */ |
2165 | break; | |
2166 | ||
2c88418c RS |
2167 | default: |
2168 | /* Any floating arithmetic may trap. */ | |
3d8bf70f | 2169 | if (SCALAR_FLOAT_MODE_P (GET_MODE (x)) |
f5eb5fd0 | 2170 | && flag_trapping_math) |
2c88418c RS |
2171 | return 1; |
2172 | } | |
2173 | ||
2174 | fmt = GET_RTX_FORMAT (code); | |
2175 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2176 | { | |
2177 | if (fmt[i] == 'e') | |
2178 | { | |
e755fcf5 | 2179 | if (may_trap_p_1 (XEXP (x, i), flags)) |
2c88418c RS |
2180 | return 1; |
2181 | } | |
2182 | else if (fmt[i] == 'E') | |
2183 | { | |
b3694847 | 2184 | int j; |
2c88418c | 2185 | for (j = 0; j < XVECLEN (x, i); j++) |
e755fcf5 | 2186 | if (may_trap_p_1 (XVECEXP (x, i, j), flags)) |
2c88418c RS |
2187 | return 1; |
2188 | } | |
2189 | } | |
2190 | return 0; | |
2191 | } | |
2358ff91 EB |
2192 | |
2193 | /* Return nonzero if evaluating rtx X might cause a trap. */ | |
2194 | ||
2195 | int | |
2196 | may_trap_p (rtx x) | |
2197 | { | |
e755fcf5 ZD |
2198 | return may_trap_p_1 (x, 0); |
2199 | } | |
2200 | ||
2201 | /* Return nonzero if evaluating rtx X might cause a trap, when the expression | |
2202 | is moved from its current location by some optimization. */ | |
2203 | ||
2204 | int | |
2205 | may_trap_after_code_motion_p (rtx x) | |
2206 | { | |
2207 | return may_trap_p_1 (x, MTP_AFTER_MOVE); | |
2358ff91 EB |
2208 | } |
2209 | ||
c0220ea4 | 2210 | /* Same as above, but additionally return nonzero if evaluating rtx X might |
2358ff91 EB |
2211 | cause a fault. We define a fault for the purpose of this function as a |
2212 | erroneous execution condition that cannot be encountered during the normal | |
2213 | execution of a valid program; the typical example is an unaligned memory | |
2214 | access on a strict alignment machine. The compiler guarantees that it | |
2215 | doesn't generate code that will fault from a valid program, but this | |
2216 | guarantee doesn't mean anything for individual instructions. Consider | |
2217 | the following example: | |
2218 | ||
2219 | struct S { int d; union { char *cp; int *ip; }; }; | |
2220 | ||
2221 | int foo(struct S *s) | |
2222 | { | |
2223 | if (s->d == 1) | |
2224 | return *s->ip; | |
2225 | else | |
2226 | return *s->cp; | |
2227 | } | |
2228 | ||
2229 | on a strict alignment machine. In a valid program, foo will never be | |
2230 | invoked on a structure for which d is equal to 1 and the underlying | |
2231 | unique field of the union not aligned on a 4-byte boundary, but the | |
2232 | expression *s->ip might cause a fault if considered individually. | |
2233 | ||
2234 | At the RTL level, potentially problematic expressions will almost always | |
2235 | verify may_trap_p; for example, the above dereference can be emitted as | |
2236 | (mem:SI (reg:P)) and this expression is may_trap_p for a generic register. | |
2237 | However, suppose that foo is inlined in a caller that causes s->cp to | |
2238 | point to a local character variable and guarantees that s->d is not set | |
2239 | to 1; foo may have been effectively translated into pseudo-RTL as: | |
2240 | ||
2241 | if ((reg:SI) == 1) | |
2242 | (set (reg:SI) (mem:SI (%fp - 7))) | |
2243 | else | |
2244 | (set (reg:QI) (mem:QI (%fp - 7))) | |
2245 | ||
2246 | Now (mem:SI (%fp - 7)) is considered as not may_trap_p since it is a | |
2247 | memory reference to a stack slot, but it will certainly cause a fault | |
2248 | on a strict alignment machine. */ | |
2249 | ||
2250 | int | |
2251 | may_trap_or_fault_p (rtx x) | |
2252 | { | |
e755fcf5 | 2253 | return may_trap_p_1 (x, MTP_UNALIGNED_MEMS); |
2358ff91 | 2254 | } |
2c88418c RS |
2255 | \f |
2256 | /* Return nonzero if X contains a comparison that is not either EQ or NE, | |
2257 | i.e., an inequality. */ | |
2258 | ||
2259 | int | |
0c20a65f | 2260 | inequality_comparisons_p (rtx x) |
2c88418c | 2261 | { |
b3694847 SS |
2262 | const char *fmt; |
2263 | int len, i; | |
2264 | enum rtx_code code = GET_CODE (x); | |
2c88418c RS |
2265 | |
2266 | switch (code) | |
2267 | { | |
2268 | case REG: | |
2269 | case SCRATCH: | |
2270 | case PC: | |
2271 | case CC0: | |
2272 | case CONST_INT: | |
2273 | case CONST_DOUBLE: | |
69ef87e2 | 2274 | case CONST_VECTOR: |
2c88418c RS |
2275 | case CONST: |
2276 | case LABEL_REF: | |
2277 | case SYMBOL_REF: | |
2278 | return 0; | |
2279 | ||
2280 | case LT: | |
2281 | case LTU: | |
2282 | case GT: | |
2283 | case GTU: | |
2284 | case LE: | |
2285 | case LEU: | |
2286 | case GE: | |
2287 | case GEU: | |
2288 | return 1; | |
a6a2274a | 2289 | |
e9a25f70 JL |
2290 | default: |
2291 | break; | |
2c88418c RS |
2292 | } |
2293 | ||
2294 | len = GET_RTX_LENGTH (code); | |
2295 | fmt = GET_RTX_FORMAT (code); | |
2296 | ||
2297 | for (i = 0; i < len; i++) | |
2298 | { | |
2299 | if (fmt[i] == 'e') | |
2300 | { | |
2301 | if (inequality_comparisons_p (XEXP (x, i))) | |
2302 | return 1; | |
2303 | } | |
2304 | else if (fmt[i] == 'E') | |
2305 | { | |
b3694847 | 2306 | int j; |
2c88418c RS |
2307 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) |
2308 | if (inequality_comparisons_p (XVECEXP (x, i, j))) | |
2309 | return 1; | |
2310 | } | |
2311 | } | |
a6a2274a | 2312 | |
2c88418c RS |
2313 | return 0; |
2314 | } | |
2315 | \f | |
1ed0205e VM |
2316 | /* Replace any occurrence of FROM in X with TO. The function does |
2317 | not enter into CONST_DOUBLE for the replace. | |
2c88418c RS |
2318 | |
2319 | Note that copying is not done so X must not be shared unless all copies | |
2320 | are to be modified. */ | |
2321 | ||
2322 | rtx | |
0c20a65f | 2323 | replace_rtx (rtx x, rtx from, rtx to) |
2c88418c | 2324 | { |
b3694847 SS |
2325 | int i, j; |
2326 | const char *fmt; | |
2c88418c | 2327 | |
1ed0205e | 2328 | /* The following prevents loops occurrence when we change MEM in |
dc297297 | 2329 | CONST_DOUBLE onto the same CONST_DOUBLE. */ |
1ed0205e VM |
2330 | if (x != 0 && GET_CODE (x) == CONST_DOUBLE) |
2331 | return x; | |
2332 | ||
2c88418c RS |
2333 | if (x == from) |
2334 | return to; | |
2335 | ||
2336 | /* Allow this function to make replacements in EXPR_LISTs. */ | |
2337 | if (x == 0) | |
2338 | return 0; | |
2339 | ||
9dd791c8 AO |
2340 | if (GET_CODE (x) == SUBREG) |
2341 | { | |
2342 | rtx new = replace_rtx (SUBREG_REG (x), from, to); | |
2343 | ||
2344 | if (GET_CODE (new) == CONST_INT) | |
2345 | { | |
2346 | x = simplify_subreg (GET_MODE (x), new, | |
2347 | GET_MODE (SUBREG_REG (x)), | |
2348 | SUBREG_BYTE (x)); | |
41374e13 | 2349 | gcc_assert (x); |
9dd791c8 AO |
2350 | } |
2351 | else | |
2352 | SUBREG_REG (x) = new; | |
2353 | ||
2354 | return x; | |
2355 | } | |
2356 | else if (GET_CODE (x) == ZERO_EXTEND) | |
2357 | { | |
2358 | rtx new = replace_rtx (XEXP (x, 0), from, to); | |
2359 | ||
2360 | if (GET_CODE (new) == CONST_INT) | |
2361 | { | |
2362 | x = simplify_unary_operation (ZERO_EXTEND, GET_MODE (x), | |
2363 | new, GET_MODE (XEXP (x, 0))); | |
41374e13 | 2364 | gcc_assert (x); |
9dd791c8 AO |
2365 | } |
2366 | else | |
2367 | XEXP (x, 0) = new; | |
2368 | ||
2369 | return x; | |
2370 | } | |
2371 | ||
2c88418c RS |
2372 | fmt = GET_RTX_FORMAT (GET_CODE (x)); |
2373 | for (i = GET_RTX_LENGTH (GET_CODE (x)) - 1; i >= 0; i--) | |
2374 | { | |
2375 | if (fmt[i] == 'e') | |
2376 | XEXP (x, i) = replace_rtx (XEXP (x, i), from, to); | |
2377 | else if (fmt[i] == 'E') | |
2378 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) | |
2379 | XVECEXP (x, i, j) = replace_rtx (XVECEXP (x, i, j), from, to); | |
2380 | } | |
2381 | ||
2382 | return x; | |
a6a2274a | 2383 | } |
2c88418c | 2384 | \f |
39811184 | 2385 | /* Replace occurrences of the old label in *X with the new one. |
4af16369 | 2386 | DATA is a REPLACE_LABEL_DATA containing the old and new labels. */ |
39811184 JZ |
2387 | |
2388 | int | |
0c20a65f | 2389 | replace_label (rtx *x, void *data) |
39811184 JZ |
2390 | { |
2391 | rtx l = *x; | |
4af16369 JZ |
2392 | rtx old_label = ((replace_label_data *) data)->r1; |
2393 | rtx new_label = ((replace_label_data *) data)->r2; | |
2394 | bool update_label_nuses = ((replace_label_data *) data)->update_label_nuses; | |
39811184 JZ |
2395 | |
2396 | if (l == NULL_RTX) | |
2397 | return 0; | |
2398 | ||
173cd571 JZ |
2399 | if (GET_CODE (l) == SYMBOL_REF |
2400 | && CONSTANT_POOL_ADDRESS_P (l)) | |
4af16369 | 2401 | { |
173cd571 | 2402 | rtx c = get_pool_constant (l); |
4af16369 JZ |
2403 | if (rtx_referenced_p (old_label, c)) |
2404 | { | |
2405 | rtx new_c, new_l; | |
2406 | replace_label_data *d = (replace_label_data *) data; | |
0c20a65f | 2407 | |
4af16369 JZ |
2408 | /* Create a copy of constant C; replace the label inside |
2409 | but do not update LABEL_NUSES because uses in constant pool | |
2410 | are not counted. */ | |
2411 | new_c = copy_rtx (c); | |
2412 | d->update_label_nuses = false; | |
2413 | for_each_rtx (&new_c, replace_label, data); | |
2414 | d->update_label_nuses = update_label_nuses; | |
2415 | ||
2416 | /* Add the new constant NEW_C to constant pool and replace | |
2417 | the old reference to constant by new reference. */ | |
173cd571 | 2418 | new_l = XEXP (force_const_mem (get_pool_mode (l), new_c), 0); |
4af16369 JZ |
2419 | *x = replace_rtx (l, l, new_l); |
2420 | } | |
2421 | return 0; | |
2422 | } | |
2423 | ||
39811184 JZ |
2424 | /* If this is a JUMP_INSN, then we also need to fix the JUMP_LABEL |
2425 | field. This is not handled by for_each_rtx because it doesn't | |
2426 | handle unprinted ('0') fields. */ | |
4b4bf941 | 2427 | if (JUMP_P (l) && JUMP_LABEL (l) == old_label) |
39811184 | 2428 | JUMP_LABEL (l) = new_label; |
39811184 | 2429 | |
4af16369 JZ |
2430 | if ((GET_CODE (l) == LABEL_REF |
2431 | || GET_CODE (l) == INSN_LIST) | |
2432 | && XEXP (l, 0) == old_label) | |
2433 | { | |
2434 | XEXP (l, 0) = new_label; | |
2435 | if (update_label_nuses) | |
2436 | { | |
2437 | ++LABEL_NUSES (new_label); | |
2438 | --LABEL_NUSES (old_label); | |
2439 | } | |
2440 | return 0; | |
2441 | } | |
39811184 JZ |
2442 | |
2443 | return 0; | |
2444 | } | |
2445 | ||
4af16369 JZ |
2446 | /* When *BODY is equal to X or X is directly referenced by *BODY |
2447 | return nonzero, thus FOR_EACH_RTX stops traversing and returns nonzero | |
2448 | too, otherwise FOR_EACH_RTX continues traversing *BODY. */ | |
39811184 JZ |
2449 | |
2450 | static int | |
0c20a65f | 2451 | rtx_referenced_p_1 (rtx *body, void *x) |
39811184 | 2452 | { |
4af16369 JZ |
2453 | rtx y = (rtx) x; |
2454 | ||
2455 | if (*body == NULL_RTX) | |
2456 | return y == NULL_RTX; | |
2457 | ||
2458 | /* Return true if a label_ref *BODY refers to label Y. */ | |
4b4bf941 | 2459 | if (GET_CODE (*body) == LABEL_REF && LABEL_P (y)) |
4af16369 JZ |
2460 | return XEXP (*body, 0) == y; |
2461 | ||
2462 | /* If *BODY is a reference to pool constant traverse the constant. */ | |
2463 | if (GET_CODE (*body) == SYMBOL_REF | |
2464 | && CONSTANT_POOL_ADDRESS_P (*body)) | |
2465 | return rtx_referenced_p (y, get_pool_constant (*body)); | |
2466 | ||
2467 | /* By default, compare the RTL expressions. */ | |
2468 | return rtx_equal_p (*body, y); | |
39811184 JZ |
2469 | } |
2470 | ||
4af16369 | 2471 | /* Return true if X is referenced in BODY. */ |
39811184 JZ |
2472 | |
2473 | int | |
0c20a65f | 2474 | rtx_referenced_p (rtx x, rtx body) |
39811184 | 2475 | { |
4af16369 | 2476 | return for_each_rtx (&body, rtx_referenced_p_1, x); |
39811184 JZ |
2477 | } |
2478 | ||
ee735eef JZ |
2479 | /* If INSN is a tablejump return true and store the label (before jump table) to |
2480 | *LABELP and the jump table to *TABLEP. LABELP and TABLEP may be NULL. */ | |
39811184 JZ |
2481 | |
2482 | bool | |
ee735eef | 2483 | tablejump_p (rtx insn, rtx *labelp, rtx *tablep) |
39811184 | 2484 | { |
ee735eef JZ |
2485 | rtx label, table; |
2486 | ||
4b4bf941 | 2487 | if (JUMP_P (insn) |
ee735eef JZ |
2488 | && (label = JUMP_LABEL (insn)) != NULL_RTX |
2489 | && (table = next_active_insn (label)) != NULL_RTX | |
4b4bf941 | 2490 | && JUMP_P (table) |
ee735eef JZ |
2491 | && (GET_CODE (PATTERN (table)) == ADDR_VEC |
2492 | || GET_CODE (PATTERN (table)) == ADDR_DIFF_VEC)) | |
39811184 | 2493 | { |
ee735eef JZ |
2494 | if (labelp) |
2495 | *labelp = label; | |
2496 | if (tablep) | |
2497 | *tablep = table; | |
39811184 JZ |
2498 | return true; |
2499 | } | |
2500 | return false; | |
2501 | } | |
2502 | ||
fce7e199 RH |
2503 | /* A subroutine of computed_jump_p, return 1 if X contains a REG or MEM or |
2504 | constant that is not in the constant pool and not in the condition | |
2505 | of an IF_THEN_ELSE. */ | |
2a1777af JL |
2506 | |
2507 | static int | |
0c20a65f | 2508 | computed_jump_p_1 (rtx x) |
2a1777af JL |
2509 | { |
2510 | enum rtx_code code = GET_CODE (x); | |
2511 | int i, j; | |
6f7d635c | 2512 | const char *fmt; |
2a1777af JL |
2513 | |
2514 | switch (code) | |
2515 | { | |
2a1777af JL |
2516 | case LABEL_REF: |
2517 | case PC: | |
2518 | return 0; | |
2519 | ||
fce7e199 RH |
2520 | case CONST: |
2521 | case CONST_INT: | |
2522 | case CONST_DOUBLE: | |
69ef87e2 | 2523 | case CONST_VECTOR: |
fce7e199 | 2524 | case SYMBOL_REF: |
2a1777af JL |
2525 | case REG: |
2526 | return 1; | |
2527 | ||
2528 | case MEM: | |
2529 | return ! (GET_CODE (XEXP (x, 0)) == SYMBOL_REF | |
2530 | && CONSTANT_POOL_ADDRESS_P (XEXP (x, 0))); | |
2531 | ||
2532 | case IF_THEN_ELSE: | |
fce7e199 RH |
2533 | return (computed_jump_p_1 (XEXP (x, 1)) |
2534 | || computed_jump_p_1 (XEXP (x, 2))); | |
1d300e19 KG |
2535 | |
2536 | default: | |
2537 | break; | |
2a1777af JL |
2538 | } |
2539 | ||
2540 | fmt = GET_RTX_FORMAT (code); | |
2541 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2542 | { | |
2543 | if (fmt[i] == 'e' | |
fce7e199 | 2544 | && computed_jump_p_1 (XEXP (x, i))) |
2a1777af JL |
2545 | return 1; |
2546 | ||
d4757e6a | 2547 | else if (fmt[i] == 'E') |
2a1777af | 2548 | for (j = 0; j < XVECLEN (x, i); j++) |
fce7e199 | 2549 | if (computed_jump_p_1 (XVECEXP (x, i, j))) |
2a1777af JL |
2550 | return 1; |
2551 | } | |
2552 | ||
2553 | return 0; | |
2554 | } | |
2555 | ||
2556 | /* Return nonzero if INSN is an indirect jump (aka computed jump). | |
2557 | ||
2558 | Tablejumps and casesi insns are not considered indirect jumps; | |
4eb00163 | 2559 | we can recognize them by a (use (label_ref)). */ |
2a1777af JL |
2560 | |
2561 | int | |
0c20a65f | 2562 | computed_jump_p (rtx insn) |
2a1777af JL |
2563 | { |
2564 | int i; | |
4b4bf941 | 2565 | if (JUMP_P (insn)) |
2a1777af JL |
2566 | { |
2567 | rtx pat = PATTERN (insn); | |
2a1777af | 2568 | |
f759eb8b AO |
2569 | if (find_reg_note (insn, REG_LABEL, NULL_RTX)) |
2570 | return 0; | |
2571 | else if (GET_CODE (pat) == PARALLEL) | |
2a1777af JL |
2572 | { |
2573 | int len = XVECLEN (pat, 0); | |
2574 | int has_use_labelref = 0; | |
2575 | ||
2576 | for (i = len - 1; i >= 0; i--) | |
2577 | if (GET_CODE (XVECEXP (pat, 0, i)) == USE | |
2578 | && (GET_CODE (XEXP (XVECEXP (pat, 0, i), 0)) | |
2579 | == LABEL_REF)) | |
2580 | has_use_labelref = 1; | |
2581 | ||
2582 | if (! has_use_labelref) | |
2583 | for (i = len - 1; i >= 0; i--) | |
2584 | if (GET_CODE (XVECEXP (pat, 0, i)) == SET | |
2585 | && SET_DEST (XVECEXP (pat, 0, i)) == pc_rtx | |
fce7e199 | 2586 | && computed_jump_p_1 (SET_SRC (XVECEXP (pat, 0, i)))) |
2a1777af JL |
2587 | return 1; |
2588 | } | |
2589 | else if (GET_CODE (pat) == SET | |
2590 | && SET_DEST (pat) == pc_rtx | |
fce7e199 | 2591 | && computed_jump_p_1 (SET_SRC (pat))) |
2a1777af JL |
2592 | return 1; |
2593 | } | |
2594 | return 0; | |
2595 | } | |
ccc2d6d0 | 2596 | |
cf94b0fc PB |
2597 | /* Optimized loop of for_each_rtx, trying to avoid useless recursive |
2598 | calls. Processes the subexpressions of EXP and passes them to F. */ | |
2599 | static int | |
2600 | for_each_rtx_1 (rtx exp, int n, rtx_function f, void *data) | |
2601 | { | |
2602 | int result, i, j; | |
2603 | const char *format = GET_RTX_FORMAT (GET_CODE (exp)); | |
2604 | rtx *x; | |
2605 | ||
2606 | for (; format[n] != '\0'; n++) | |
2607 | { | |
2608 | switch (format[n]) | |
2609 | { | |
2610 | case 'e': | |
2611 | /* Call F on X. */ | |
2612 | x = &XEXP (exp, n); | |
2613 | result = (*f) (x, data); | |
2614 | if (result == -1) | |
2615 | /* Do not traverse sub-expressions. */ | |
2616 | continue; | |
2617 | else if (result != 0) | |
2618 | /* Stop the traversal. */ | |
2619 | return result; | |
2620 | ||
2621 | if (*x == NULL_RTX) | |
2622 | /* There are no sub-expressions. */ | |
2623 | continue; | |
2624 | ||
2625 | i = non_rtx_starting_operands[GET_CODE (*x)]; | |
2626 | if (i >= 0) | |
2627 | { | |
2628 | result = for_each_rtx_1 (*x, i, f, data); | |
2629 | if (result != 0) | |
2630 | return result; | |
2631 | } | |
2632 | break; | |
2633 | ||
2634 | case 'V': | |
2635 | case 'E': | |
2636 | if (XVEC (exp, n) == 0) | |
2637 | continue; | |
2638 | for (j = 0; j < XVECLEN (exp, n); ++j) | |
2639 | { | |
2640 | /* Call F on X. */ | |
2641 | x = &XVECEXP (exp, n, j); | |
2642 | result = (*f) (x, data); | |
2643 | if (result == -1) | |
2644 | /* Do not traverse sub-expressions. */ | |
2645 | continue; | |
2646 | else if (result != 0) | |
2647 | /* Stop the traversal. */ | |
2648 | return result; | |
2649 | ||
2650 | if (*x == NULL_RTX) | |
2651 | /* There are no sub-expressions. */ | |
2652 | continue; | |
2653 | ||
2654 | i = non_rtx_starting_operands[GET_CODE (*x)]; | |
2655 | if (i >= 0) | |
2656 | { | |
2657 | result = for_each_rtx_1 (*x, i, f, data); | |
2658 | if (result != 0) | |
2659 | return result; | |
2660 | } | |
2661 | } | |
2662 | break; | |
2663 | ||
2664 | default: | |
2665 | /* Nothing to do. */ | |
2666 | break; | |
2667 | } | |
2668 | } | |
2669 | ||
2670 | return 0; | |
2671 | } | |
2672 | ||
ccc2d6d0 MM |
2673 | /* Traverse X via depth-first search, calling F for each |
2674 | sub-expression (including X itself). F is also passed the DATA. | |
2675 | If F returns -1, do not traverse sub-expressions, but continue | |
2676 | traversing the rest of the tree. If F ever returns any other | |
40f03658 | 2677 | nonzero value, stop the traversal, and return the value returned |
ccc2d6d0 MM |
2678 | by F. Otherwise, return 0. This function does not traverse inside |
2679 | tree structure that contains RTX_EXPRs, or into sub-expressions | |
2680 | whose format code is `0' since it is not known whether or not those | |
2681 | codes are actually RTL. | |
2682 | ||
2683 | This routine is very general, and could (should?) be used to | |
2684 | implement many of the other routines in this file. */ | |
2685 | ||
ae0b51ef | 2686 | int |
0c20a65f | 2687 | for_each_rtx (rtx *x, rtx_function f, void *data) |
ccc2d6d0 MM |
2688 | { |
2689 | int result; | |
ccc2d6d0 MM |
2690 | int i; |
2691 | ||
2692 | /* Call F on X. */ | |
b987f237 | 2693 | result = (*f) (x, data); |
ccc2d6d0 MM |
2694 | if (result == -1) |
2695 | /* Do not traverse sub-expressions. */ | |
2696 | return 0; | |
2697 | else if (result != 0) | |
2698 | /* Stop the traversal. */ | |
2699 | return result; | |
2700 | ||
2701 | if (*x == NULL_RTX) | |
2702 | /* There are no sub-expressions. */ | |
2703 | return 0; | |
2704 | ||
cf94b0fc PB |
2705 | i = non_rtx_starting_operands[GET_CODE (*x)]; |
2706 | if (i < 0) | |
2707 | return 0; | |
ccc2d6d0 | 2708 | |
cf94b0fc | 2709 | return for_each_rtx_1 (*x, i, f, data); |
ccc2d6d0 | 2710 | } |
3ec2b590 | 2711 | |
cf94b0fc | 2712 | |
777b1b71 RH |
2713 | /* Searches X for any reference to REGNO, returning the rtx of the |
2714 | reference found if any. Otherwise, returns NULL_RTX. */ | |
2715 | ||
2716 | rtx | |
0c20a65f | 2717 | regno_use_in (unsigned int regno, rtx x) |
777b1b71 | 2718 | { |
b3694847 | 2719 | const char *fmt; |
777b1b71 RH |
2720 | int i, j; |
2721 | rtx tem; | |
2722 | ||
f8cfc6aa | 2723 | if (REG_P (x) && REGNO (x) == regno) |
777b1b71 RH |
2724 | return x; |
2725 | ||
2726 | fmt = GET_RTX_FORMAT (GET_CODE (x)); | |
2727 | for (i = GET_RTX_LENGTH (GET_CODE (x)) - 1; i >= 0; i--) | |
2728 | { | |
2729 | if (fmt[i] == 'e') | |
2730 | { | |
2731 | if ((tem = regno_use_in (regno, XEXP (x, i)))) | |
2732 | return tem; | |
2733 | } | |
2734 | else if (fmt[i] == 'E') | |
2735 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) | |
2736 | if ((tem = regno_use_in (regno , XVECEXP (x, i, j)))) | |
2737 | return tem; | |
2738 | } | |
2739 | ||
2740 | return NULL_RTX; | |
2741 | } | |
2dfa9a87 | 2742 | |
e5c56fd9 JH |
2743 | /* Return a value indicating whether OP, an operand of a commutative |
2744 | operation, is preferred as the first or second operand. The higher | |
2745 | the value, the stronger the preference for being the first operand. | |
2746 | We use negative values to indicate a preference for the first operand | |
2747 | and positive values for the second operand. */ | |
2748 | ||
9b3bd424 | 2749 | int |
0c20a65f | 2750 | commutative_operand_precedence (rtx op) |
e5c56fd9 | 2751 | { |
e3d6e740 | 2752 | enum rtx_code code = GET_CODE (op); |
e3d6e740 | 2753 | |
e5c56fd9 | 2754 | /* Constants always come the second operand. Prefer "nice" constants. */ |
e3d6e740 | 2755 | if (code == CONST_INT) |
9ce79a7a | 2756 | return -7; |
e3d6e740 | 2757 | if (code == CONST_DOUBLE) |
9ce79a7a RS |
2758 | return -6; |
2759 | op = avoid_constant_pool_reference (op); | |
79b82df3 | 2760 | code = GET_CODE (op); |
ec8e098d PB |
2761 | |
2762 | switch (GET_RTX_CLASS (code)) | |
2763 | { | |
2764 | case RTX_CONST_OBJ: | |
2765 | if (code == CONST_INT) | |
2766 | return -5; | |
2767 | if (code == CONST_DOUBLE) | |
2768 | return -4; | |
2769 | return -3; | |
2770 | ||
2771 | case RTX_EXTRA: | |
2772 | /* SUBREGs of objects should come second. */ | |
2773 | if (code == SUBREG && OBJECT_P (SUBREG_REG (op))) | |
2774 | return -2; | |
2775 | ||
2776 | if (!CONSTANT_P (op)) | |
2777 | return 0; | |
2778 | else | |
2779 | /* As for RTX_CONST_OBJ. */ | |
2780 | return -3; | |
2781 | ||
2782 | case RTX_OBJ: | |
2783 | /* Complex expressions should be the first, so decrease priority | |
2784 | of objects. */ | |
2785 | return -1; | |
2786 | ||
2787 | case RTX_COMM_ARITH: | |
2788 | /* Prefer operands that are themselves commutative to be first. | |
2789 | This helps to make things linear. In particular, | |
2790 | (and (and (reg) (reg)) (not (reg))) is canonical. */ | |
2791 | return 4; | |
2792 | ||
2793 | case RTX_BIN_ARITH: | |
2794 | /* If only one operand is a binary expression, it will be the first | |
2795 | operand. In particular, (plus (minus (reg) (reg)) (neg (reg))) | |
2796 | is canonical, although it will usually be further simplified. */ | |
2797 | return 2; | |
e3d6e740 | 2798 | |
ec8e098d PB |
2799 | case RTX_UNARY: |
2800 | /* Then prefer NEG and NOT. */ | |
2801 | if (code == NEG || code == NOT) | |
2802 | return 1; | |
e5c56fd9 | 2803 | |
ec8e098d PB |
2804 | default: |
2805 | return 0; | |
2806 | } | |
e5c56fd9 JH |
2807 | } |
2808 | ||
f63d1bf7 | 2809 | /* Return 1 iff it is necessary to swap operands of commutative operation |
e5c56fd9 JH |
2810 | in order to canonicalize expression. */ |
2811 | ||
2812 | int | |
0c20a65f | 2813 | swap_commutative_operands_p (rtx x, rtx y) |
e5c56fd9 | 2814 | { |
9b3bd424 RH |
2815 | return (commutative_operand_precedence (x) |
2816 | < commutative_operand_precedence (y)); | |
e5c56fd9 | 2817 | } |
2dfa9a87 MH |
2818 | |
2819 | /* Return 1 if X is an autoincrement side effect and the register is | |
2820 | not the stack pointer. */ | |
2821 | int | |
0c20a65f | 2822 | auto_inc_p (rtx x) |
2dfa9a87 MH |
2823 | { |
2824 | switch (GET_CODE (x)) | |
2825 | { | |
2826 | case PRE_INC: | |
2827 | case POST_INC: | |
2828 | case PRE_DEC: | |
2829 | case POST_DEC: | |
2830 | case PRE_MODIFY: | |
2831 | case POST_MODIFY: | |
2832 | /* There are no REG_INC notes for SP. */ | |
2833 | if (XEXP (x, 0) != stack_pointer_rtx) | |
2834 | return 1; | |
2835 | default: | |
2836 | break; | |
2837 | } | |
2838 | return 0; | |
2839 | } | |
3b10cf4b | 2840 | |
f9da5064 | 2841 | /* Return nonzero if IN contains a piece of rtl that has the address LOC. */ |
db7ba742 | 2842 | int |
0c20a65f | 2843 | loc_mentioned_in_p (rtx *loc, rtx in) |
db7ba742 | 2844 | { |
a52b023a PB |
2845 | enum rtx_code code; |
2846 | const char *fmt; | |
db7ba742 R |
2847 | int i, j; |
2848 | ||
a52b023a PB |
2849 | if (!in) |
2850 | return 0; | |
2851 | ||
2852 | code = GET_CODE (in); | |
2853 | fmt = GET_RTX_FORMAT (code); | |
db7ba742 R |
2854 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) |
2855 | { | |
9ce88f5e | 2856 | if (loc == &in->u.fld[i].rt_rtx) |
db7ba742 R |
2857 | return 1; |
2858 | if (fmt[i] == 'e') | |
2859 | { | |
2860 | if (loc_mentioned_in_p (loc, XEXP (in, i))) | |
2861 | return 1; | |
2862 | } | |
2863 | else if (fmt[i] == 'E') | |
2864 | for (j = XVECLEN (in, i) - 1; j >= 0; j--) | |
2865 | if (loc_mentioned_in_p (loc, XVECEXP (in, i, j))) | |
2866 | return 1; | |
2867 | } | |
2868 | return 0; | |
2869 | } | |
ddef6bc7 | 2870 | |
bb51e270 RS |
2871 | /* Helper function for subreg_lsb. Given a subreg's OUTER_MODE, INNER_MODE, |
2872 | and SUBREG_BYTE, return the bit offset where the subreg begins | |
2873 | (counting from the least significant bit of the operand). */ | |
33aceff2 JW |
2874 | |
2875 | unsigned int | |
bb51e270 RS |
2876 | subreg_lsb_1 (enum machine_mode outer_mode, |
2877 | enum machine_mode inner_mode, | |
2878 | unsigned int subreg_byte) | |
33aceff2 | 2879 | { |
33aceff2 JW |
2880 | unsigned int bitpos; |
2881 | unsigned int byte; | |
2882 | unsigned int word; | |
2883 | ||
2884 | /* A paradoxical subreg begins at bit position 0. */ | |
bb51e270 | 2885 | if (GET_MODE_BITSIZE (outer_mode) > GET_MODE_BITSIZE (inner_mode)) |
33aceff2 JW |
2886 | return 0; |
2887 | ||
2888 | if (WORDS_BIG_ENDIAN != BYTES_BIG_ENDIAN) | |
2889 | /* If the subreg crosses a word boundary ensure that | |
2890 | it also begins and ends on a word boundary. */ | |
41374e13 NS |
2891 | gcc_assert (!((subreg_byte % UNITS_PER_WORD |
2892 | + GET_MODE_SIZE (outer_mode)) > UNITS_PER_WORD | |
2893 | && (subreg_byte % UNITS_PER_WORD | |
2894 | || GET_MODE_SIZE (outer_mode) % UNITS_PER_WORD))); | |
33aceff2 JW |
2895 | |
2896 | if (WORDS_BIG_ENDIAN) | |
2897 | word = (GET_MODE_SIZE (inner_mode) | |
bb51e270 | 2898 | - (subreg_byte + GET_MODE_SIZE (outer_mode))) / UNITS_PER_WORD; |
33aceff2 | 2899 | else |
bb51e270 | 2900 | word = subreg_byte / UNITS_PER_WORD; |
33aceff2 JW |
2901 | bitpos = word * BITS_PER_WORD; |
2902 | ||
2903 | if (BYTES_BIG_ENDIAN) | |
2904 | byte = (GET_MODE_SIZE (inner_mode) | |
bb51e270 | 2905 | - (subreg_byte + GET_MODE_SIZE (outer_mode))) % UNITS_PER_WORD; |
33aceff2 | 2906 | else |
bb51e270 | 2907 | byte = subreg_byte % UNITS_PER_WORD; |
33aceff2 JW |
2908 | bitpos += byte * BITS_PER_UNIT; |
2909 | ||
2910 | return bitpos; | |
2911 | } | |
2912 | ||
bb51e270 RS |
2913 | /* Given a subreg X, return the bit offset where the subreg begins |
2914 | (counting from the least significant bit of the reg). */ | |
2915 | ||
2916 | unsigned int | |
2917 | subreg_lsb (rtx x) | |
2918 | { | |
2919 | return subreg_lsb_1 (GET_MODE (x), GET_MODE (SUBREG_REG (x)), | |
2920 | SUBREG_BYTE (x)); | |
2921 | } | |
2922 | ||
ddef6bc7 JJ |
2923 | /* This function returns the regno offset of a subreg expression. |
2924 | xregno - A regno of an inner hard subreg_reg (or what will become one). | |
2925 | xmode - The mode of xregno. | |
2926 | offset - The byte offset. | |
2927 | ymode - The mode of a top level SUBREG (or what may become one). | |
5809eb5f | 2928 | RETURN - The regno offset which would be used. */ |
ddef6bc7 | 2929 | unsigned int |
0c20a65f AJ |
2930 | subreg_regno_offset (unsigned int xregno, enum machine_mode xmode, |
2931 | unsigned int offset, enum machine_mode ymode) | |
ddef6bc7 | 2932 | { |
8521c414 | 2933 | int nregs_xmode, nregs_ymode; |
ddef6bc7 JJ |
2934 | int mode_multiple, nregs_multiple; |
2935 | int y_offset; | |
2936 | ||
41374e13 | 2937 | gcc_assert (xregno < FIRST_PSEUDO_REGISTER); |
ddef6bc7 | 2938 | |
dd79bb7e | 2939 | /* Adjust nregs_xmode to allow for 'holes'. */ |
8521c414 JM |
2940 | if (HARD_REGNO_NREGS_HAS_PADDING (xregno, xmode)) |
2941 | nregs_xmode = HARD_REGNO_NREGS_WITH_PADDING (xregno, xmode); | |
dd79bb7e GK |
2942 | else |
2943 | nregs_xmode = hard_regno_nregs[xregno][xmode]; | |
2944 | ||
66fd46b6 | 2945 | nregs_ymode = hard_regno_nregs[xregno][ymode]; |
eab2120d R |
2946 | |
2947 | /* If this is a big endian paradoxical subreg, which uses more actual | |
2948 | hard registers than the original register, we must return a negative | |
2949 | offset so that we find the proper highpart of the register. */ | |
2950 | if (offset == 0 | |
2951 | && nregs_ymode > nregs_xmode | |
2952 | && (GET_MODE_SIZE (ymode) > UNITS_PER_WORD | |
2953 | ? WORDS_BIG_ENDIAN : BYTES_BIG_ENDIAN)) | |
2954 | return nregs_xmode - nregs_ymode; | |
2955 | ||
ddef6bc7 JJ |
2956 | if (offset == 0 || nregs_xmode == nregs_ymode) |
2957 | return 0; | |
a6a2274a | 2958 | |
dd79bb7e | 2959 | /* Size of ymode must not be greater than the size of xmode. */ |
ddef6bc7 | 2960 | mode_multiple = GET_MODE_SIZE (xmode) / GET_MODE_SIZE (ymode); |
41374e13 | 2961 | gcc_assert (mode_multiple != 0); |
ddef6bc7 JJ |
2962 | |
2963 | y_offset = offset / GET_MODE_SIZE (ymode); | |
2964 | nregs_multiple = nregs_xmode / nregs_ymode; | |
5809eb5f | 2965 | return (y_offset / (mode_multiple / nregs_multiple)) * nregs_ymode; |
ddef6bc7 JJ |
2966 | } |
2967 | ||
04c5580f JH |
2968 | /* This function returns true when the offset is representable via |
2969 | subreg_offset in the given regno. | |
2970 | xregno - A regno of an inner hard subreg_reg (or what will become one). | |
2971 | xmode - The mode of xregno. | |
2972 | offset - The byte offset. | |
2973 | ymode - The mode of a top level SUBREG (or what may become one). | |
dd79bb7e | 2974 | RETURN - Whether the offset is representable. */ |
04c5580f | 2975 | bool |
0c20a65f AJ |
2976 | subreg_offset_representable_p (unsigned int xregno, enum machine_mode xmode, |
2977 | unsigned int offset, enum machine_mode ymode) | |
04c5580f | 2978 | { |
8521c414 | 2979 | int nregs_xmode, nregs_ymode; |
04c5580f JH |
2980 | int mode_multiple, nregs_multiple; |
2981 | int y_offset; | |
8521c414 | 2982 | int regsize_xmode, regsize_ymode; |
04c5580f | 2983 | |
41374e13 | 2984 | gcc_assert (xregno < FIRST_PSEUDO_REGISTER); |
04c5580f | 2985 | |
dd79bb7e GK |
2986 | /* If there are holes in a non-scalar mode in registers, we expect |
2987 | that it is made up of its units concatenated together. */ | |
8521c414 | 2988 | if (HARD_REGNO_NREGS_HAS_PADDING (xregno, xmode)) |
dd79bb7e | 2989 | { |
8521c414 JM |
2990 | enum machine_mode xmode_unit; |
2991 | ||
2992 | nregs_xmode = HARD_REGNO_NREGS_WITH_PADDING (xregno, xmode); | |
2993 | if (GET_MODE_INNER (xmode) == VOIDmode) | |
2994 | xmode_unit = xmode; | |
2995 | else | |
2996 | xmode_unit = GET_MODE_INNER (xmode); | |
2997 | gcc_assert (HARD_REGNO_NREGS_HAS_PADDING (xregno, xmode_unit)); | |
2998 | gcc_assert (nregs_xmode | |
2999 | == (GET_MODE_NUNITS (xmode) | |
3000 | * HARD_REGNO_NREGS_WITH_PADDING (xregno, xmode_unit))); | |
3001 | gcc_assert (hard_regno_nregs[xregno][xmode] | |
3002 | == (hard_regno_nregs[xregno][xmode_unit] | |
3003 | * GET_MODE_NUNITS (xmode))); | |
dd79bb7e GK |
3004 | |
3005 | /* You can only ask for a SUBREG of a value with holes in the middle | |
3006 | if you don't cross the holes. (Such a SUBREG should be done by | |
3007 | picking a different register class, or doing it in memory if | |
3008 | necessary.) An example of a value with holes is XCmode on 32-bit | |
3009 | x86 with -m128bit-long-double; it's represented in 6 32-bit registers, | |
3010 | 3 for each part, but in memory it's two 128-bit parts. | |
3011 | Padding is assumed to be at the end (not necessarily the 'high part') | |
3012 | of each unit. */ | |
8521c414 JM |
3013 | if ((offset / GET_MODE_SIZE (xmode_unit) + 1 |
3014 | < GET_MODE_NUNITS (xmode)) | |
3015 | && (offset / GET_MODE_SIZE (xmode_unit) | |
dd79bb7e | 3016 | != ((offset + GET_MODE_SIZE (ymode) - 1) |
8521c414 | 3017 | / GET_MODE_SIZE (xmode_unit)))) |
dd79bb7e | 3018 | return false; |
dd79bb7e GK |
3019 | } |
3020 | else | |
3021 | nregs_xmode = hard_regno_nregs[xregno][xmode]; | |
3022 | ||
66fd46b6 | 3023 | nregs_ymode = hard_regno_nregs[xregno][ymode]; |
04c5580f | 3024 | |
dd79bb7e | 3025 | /* Paradoxical subregs are otherwise valid. */ |
04c5580f JH |
3026 | if (offset == 0 |
3027 | && nregs_ymode > nregs_xmode | |
3028 | && (GET_MODE_SIZE (ymode) > UNITS_PER_WORD | |
3029 | ? WORDS_BIG_ENDIAN : BYTES_BIG_ENDIAN)) | |
3030 | return true; | |
3031 | ||
8521c414 JM |
3032 | /* If registers store different numbers of bits in the different |
3033 | modes, we cannot generally form this subreg. */ | |
3034 | regsize_xmode = GET_MODE_SIZE (xmode) / nregs_xmode; | |
3035 | regsize_ymode = GET_MODE_SIZE (ymode) / nregs_ymode; | |
3036 | if (regsize_xmode > regsize_ymode && nregs_ymode > 1) | |
3037 | return false; | |
3038 | if (regsize_ymode > regsize_xmode && nregs_xmode > 1) | |
3039 | return false; | |
3040 | ||
dd79bb7e | 3041 | /* Lowpart subregs are otherwise valid. */ |
04c5580f JH |
3042 | if (offset == subreg_lowpart_offset (ymode, xmode)) |
3043 | return true; | |
3044 | ||
dd79bb7e GK |
3045 | /* This should always pass, otherwise we don't know how to verify |
3046 | the constraint. These conditions may be relaxed but | |
3047 | subreg_regno_offset would need to be redesigned. */ | |
41374e13 | 3048 | gcc_assert ((GET_MODE_SIZE (xmode) % GET_MODE_SIZE (ymode)) == 0); |
41374e13 | 3049 | gcc_assert ((nregs_xmode % nregs_ymode) == 0); |
04c5580f | 3050 | |
b20b352b | 3051 | /* The XMODE value can be seen as a vector of NREGS_XMODE |
dcc24678 | 3052 | values. The subreg must represent a lowpart of given field. |
04c5580f | 3053 | Compute what field it is. */ |
0c20a65f AJ |
3054 | offset -= subreg_lowpart_offset (ymode, |
3055 | mode_for_size (GET_MODE_BITSIZE (xmode) | |
3056 | / nregs_xmode, | |
07015444 | 3057 | MODE_INT, 0)); |
04c5580f | 3058 | |
dd79bb7e | 3059 | /* Size of ymode must not be greater than the size of xmode. */ |
04c5580f | 3060 | mode_multiple = GET_MODE_SIZE (xmode) / GET_MODE_SIZE (ymode); |
41374e13 | 3061 | gcc_assert (mode_multiple != 0); |
04c5580f JH |
3062 | |
3063 | y_offset = offset / GET_MODE_SIZE (ymode); | |
3064 | nregs_multiple = nregs_xmode / nregs_ymode; | |
41374e13 NS |
3065 | |
3066 | gcc_assert ((offset % GET_MODE_SIZE (ymode)) == 0); | |
3067 | gcc_assert ((mode_multiple % nregs_multiple) == 0); | |
3068 | ||
04c5580f JH |
3069 | return (!(y_offset % (mode_multiple / nregs_multiple))); |
3070 | } | |
3071 | ||
dc297297 | 3072 | /* Return the final regno that a subreg expression refers to. */ |
a6a2274a | 3073 | unsigned int |
0c20a65f | 3074 | subreg_regno (rtx x) |
ddef6bc7 JJ |
3075 | { |
3076 | unsigned int ret; | |
3077 | rtx subreg = SUBREG_REG (x); | |
3078 | int regno = REGNO (subreg); | |
3079 | ||
a6a2274a KH |
3080 | ret = regno + subreg_regno_offset (regno, |
3081 | GET_MODE (subreg), | |
ddef6bc7 JJ |
3082 | SUBREG_BYTE (x), |
3083 | GET_MODE (x)); | |
3084 | return ret; | |
3085 | ||
3086 | } | |
833366d6 JH |
3087 | struct parms_set_data |
3088 | { | |
3089 | int nregs; | |
3090 | HARD_REG_SET regs; | |
3091 | }; | |
3092 | ||
3093 | /* Helper function for noticing stores to parameter registers. */ | |
3094 | static void | |
0c20a65f | 3095 | parms_set (rtx x, rtx pat ATTRIBUTE_UNUSED, void *data) |
833366d6 JH |
3096 | { |
3097 | struct parms_set_data *d = data; | |
3098 | if (REG_P (x) && REGNO (x) < FIRST_PSEUDO_REGISTER | |
3099 | && TEST_HARD_REG_BIT (d->regs, REGNO (x))) | |
3100 | { | |
3101 | CLEAR_HARD_REG_BIT (d->regs, REGNO (x)); | |
3102 | d->nregs--; | |
3103 | } | |
3104 | } | |
3105 | ||
a6a2274a | 3106 | /* Look backward for first parameter to be loaded. |
b2df20b4 DJ |
3107 | Note that loads of all parameters will not necessarily be |
3108 | found if CSE has eliminated some of them (e.g., an argument | |
3109 | to the outer function is passed down as a parameter). | |
833366d6 JH |
3110 | Do not skip BOUNDARY. */ |
3111 | rtx | |
0c20a65f | 3112 | find_first_parameter_load (rtx call_insn, rtx boundary) |
833366d6 JH |
3113 | { |
3114 | struct parms_set_data parm; | |
b2df20b4 | 3115 | rtx p, before, first_set; |
833366d6 JH |
3116 | |
3117 | /* Since different machines initialize their parameter registers | |
3118 | in different orders, assume nothing. Collect the set of all | |
3119 | parameter registers. */ | |
3120 | CLEAR_HARD_REG_SET (parm.regs); | |
3121 | parm.nregs = 0; | |
3122 | for (p = CALL_INSN_FUNCTION_USAGE (call_insn); p; p = XEXP (p, 1)) | |
3123 | if (GET_CODE (XEXP (p, 0)) == USE | |
f8cfc6aa | 3124 | && REG_P (XEXP (XEXP (p, 0), 0))) |
833366d6 | 3125 | { |
41374e13 | 3126 | gcc_assert (REGNO (XEXP (XEXP (p, 0), 0)) < FIRST_PSEUDO_REGISTER); |
833366d6 JH |
3127 | |
3128 | /* We only care about registers which can hold function | |
3129 | arguments. */ | |
3130 | if (!FUNCTION_ARG_REGNO_P (REGNO (XEXP (XEXP (p, 0), 0)))) | |
3131 | continue; | |
3132 | ||
3133 | SET_HARD_REG_BIT (parm.regs, REGNO (XEXP (XEXP (p, 0), 0))); | |
3134 | parm.nregs++; | |
3135 | } | |
3136 | before = call_insn; | |
b2df20b4 | 3137 | first_set = call_insn; |
833366d6 JH |
3138 | |
3139 | /* Search backward for the first set of a register in this set. */ | |
3140 | while (parm.nregs && before != boundary) | |
3141 | { | |
3142 | before = PREV_INSN (before); | |
3143 | ||
3144 | /* It is possible that some loads got CSEed from one call to | |
3145 | another. Stop in that case. */ | |
4b4bf941 | 3146 | if (CALL_P (before)) |
833366d6 JH |
3147 | break; |
3148 | ||
dbc1a163 | 3149 | /* Our caller needs either ensure that we will find all sets |
833366d6 | 3150 | (in case code has not been optimized yet), or take care |
eaec9b3d | 3151 | for possible labels in a way by setting boundary to preceding |
833366d6 | 3152 | CODE_LABEL. */ |
4b4bf941 | 3153 | if (LABEL_P (before)) |
dbc1a163 | 3154 | { |
41374e13 | 3155 | gcc_assert (before == boundary); |
dbc1a163 RH |
3156 | break; |
3157 | } | |
833366d6 | 3158 | |
0d025d43 | 3159 | if (INSN_P (before)) |
b2df20b4 DJ |
3160 | { |
3161 | int nregs_old = parm.nregs; | |
3162 | note_stores (PATTERN (before), parms_set, &parm); | |
3163 | /* If we found something that did not set a parameter reg, | |
3164 | we're done. Do not keep going, as that might result | |
3165 | in hoisting an insn before the setting of a pseudo | |
3166 | that is used by the hoisted insn. */ | |
3167 | if (nregs_old != parm.nregs) | |
3168 | first_set = before; | |
3169 | else | |
3170 | break; | |
3171 | } | |
833366d6 | 3172 | } |
b2df20b4 | 3173 | return first_set; |
833366d6 | 3174 | } |
3dec4024 | 3175 | |
14b493d6 | 3176 | /* Return true if we should avoid inserting code between INSN and preceding |
3dec4024 JH |
3177 | call instruction. */ |
3178 | ||
3179 | bool | |
0c20a65f | 3180 | keep_with_call_p (rtx insn) |
3dec4024 JH |
3181 | { |
3182 | rtx set; | |
3183 | ||
3184 | if (INSN_P (insn) && (set = single_set (insn)) != NULL) | |
3185 | { | |
f8cfc6aa | 3186 | if (REG_P (SET_DEST (set)) |
5df533b3 | 3187 | && REGNO (SET_DEST (set)) < FIRST_PSEUDO_REGISTER |
3dec4024 JH |
3188 | && fixed_regs[REGNO (SET_DEST (set))] |
3189 | && general_operand (SET_SRC (set), VOIDmode)) | |
3190 | return true; | |
f8cfc6aa | 3191 | if (REG_P (SET_SRC (set)) |
3dec4024 | 3192 | && FUNCTION_VALUE_REGNO_P (REGNO (SET_SRC (set))) |
f8cfc6aa | 3193 | && REG_P (SET_DEST (set)) |
3dec4024 JH |
3194 | && REGNO (SET_DEST (set)) >= FIRST_PSEUDO_REGISTER) |
3195 | return true; | |
bc204393 RH |
3196 | /* There may be a stack pop just after the call and before the store |
3197 | of the return register. Search for the actual store when deciding | |
3198 | if we can break or not. */ | |
3dec4024 JH |
3199 | if (SET_DEST (set) == stack_pointer_rtx) |
3200 | { | |
3201 | rtx i2 = next_nonnote_insn (insn); | |
bc204393 | 3202 | if (i2 && keep_with_call_p (i2)) |
3dec4024 JH |
3203 | return true; |
3204 | } | |
3205 | } | |
3206 | return false; | |
3207 | } | |
71d2c5bd | 3208 | |
432f982f JH |
3209 | /* Return true if LABEL is a target of JUMP_INSN. This applies only |
3210 | to non-complex jumps. That is, direct unconditional, conditional, | |
3211 | and tablejumps, but not computed jumps or returns. It also does | |
3212 | not apply to the fallthru case of a conditional jump. */ | |
3213 | ||
3214 | bool | |
3215 | label_is_jump_target_p (rtx label, rtx jump_insn) | |
3216 | { | |
3217 | rtx tmp = JUMP_LABEL (jump_insn); | |
3218 | ||
3219 | if (label == tmp) | |
3220 | return true; | |
3221 | ||
3222 | if (tablejump_p (jump_insn, NULL, &tmp)) | |
3223 | { | |
3224 | rtvec vec = XVEC (PATTERN (tmp), | |
3225 | GET_CODE (PATTERN (tmp)) == ADDR_DIFF_VEC); | |
3226 | int i, veclen = GET_NUM_ELEM (vec); | |
3227 | ||
3228 | for (i = 0; i < veclen; ++i) | |
3229 | if (XEXP (RTVEC_ELT (vec, i), 0) == label) | |
3230 | return true; | |
3231 | } | |
3232 | ||
3233 | return false; | |
3234 | } | |
3235 | ||
f894b69b PB |
3236 | \f |
3237 | /* Return an estimate of the cost of computing rtx X. | |
3238 | One use is in cse, to decide which expression to keep in the hash table. | |
3239 | Another is in rtl generation, to pick the cheapest way to multiply. | |
3240 | Other uses like the latter are expected in the future. */ | |
3241 | ||
3242 | int | |
3243 | rtx_cost (rtx x, enum rtx_code outer_code ATTRIBUTE_UNUSED) | |
3244 | { | |
3245 | int i, j; | |
3246 | enum rtx_code code; | |
3247 | const char *fmt; | |
3248 | int total; | |
3249 | ||
3250 | if (x == 0) | |
3251 | return 0; | |
3252 | ||
3253 | /* Compute the default costs of certain things. | |
3254 | Note that targetm.rtx_costs can override the defaults. */ | |
3255 | ||
3256 | code = GET_CODE (x); | |
3257 | switch (code) | |
3258 | { | |
3259 | case MULT: | |
3260 | total = COSTS_N_INSNS (5); | |
3261 | break; | |
3262 | case DIV: | |
3263 | case UDIV: | |
3264 | case MOD: | |
3265 | case UMOD: | |
3266 | total = COSTS_N_INSNS (7); | |
3267 | break; | |
3268 | case USE: | |
db3edc20 | 3269 | /* Used in combine.c as a marker. */ |
f894b69b PB |
3270 | total = 0; |
3271 | break; | |
3272 | default: | |
3273 | total = COSTS_N_INSNS (1); | |
3274 | } | |
3275 | ||
3276 | switch (code) | |
3277 | { | |
3278 | case REG: | |
3279 | return 0; | |
3280 | ||
3281 | case SUBREG: | |
edb81165 | 3282 | total = 0; |
f894b69b PB |
3283 | /* If we can't tie these modes, make this expensive. The larger |
3284 | the mode, the more expensive it is. */ | |
3285 | if (! MODES_TIEABLE_P (GET_MODE (x), GET_MODE (SUBREG_REG (x)))) | |
3286 | return COSTS_N_INSNS (2 | |
3287 | + GET_MODE_SIZE (GET_MODE (x)) / UNITS_PER_WORD); | |
3288 | break; | |
3289 | ||
3290 | default: | |
5fd9b178 | 3291 | if (targetm.rtx_costs (x, code, outer_code, &total)) |
f894b69b PB |
3292 | return total; |
3293 | break; | |
3294 | } | |
3295 | ||
3296 | /* Sum the costs of the sub-rtx's, plus cost of this operation, | |
3297 | which is already in total. */ | |
3298 | ||
3299 | fmt = GET_RTX_FORMAT (code); | |
3300 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
3301 | if (fmt[i] == 'e') | |
3302 | total += rtx_cost (XEXP (x, i), code); | |
3303 | else if (fmt[i] == 'E') | |
3304 | for (j = 0; j < XVECLEN (x, i); j++) | |
3305 | total += rtx_cost (XVECEXP (x, i, j), code); | |
3306 | ||
3307 | return total; | |
3308 | } | |
3309 | \f | |
3310 | /* Return cost of address expression X. | |
3311 | Expect that X is properly formed address reference. */ | |
3312 | ||
3313 | int | |
3314 | address_cost (rtx x, enum machine_mode mode) | |
3315 | { | |
f894b69b PB |
3316 | /* We may be asked for cost of various unusual addresses, such as operands |
3317 | of push instruction. It is not worthwhile to complicate writing | |
3318 | of the target hook by such cases. */ | |
3319 | ||
3320 | if (!memory_address_p (mode, x)) | |
3321 | return 1000; | |
3322 | ||
5fd9b178 | 3323 | return targetm.address_cost (x); |
f894b69b PB |
3324 | } |
3325 | ||
3326 | /* If the target doesn't override, compute the cost as with arithmetic. */ | |
3327 | ||
3328 | int | |
3329 | default_address_cost (rtx x) | |
3330 | { | |
3331 | return rtx_cost (x, MEM); | |
3332 | } | |
2f93eea8 PB |
3333 | \f |
3334 | ||
3335 | unsigned HOST_WIDE_INT | |
3336 | nonzero_bits (rtx x, enum machine_mode mode) | |
3337 | { | |
3338 | return cached_nonzero_bits (x, mode, NULL_RTX, VOIDmode, 0); | |
3339 | } | |
3340 | ||
3341 | unsigned int | |
3342 | num_sign_bit_copies (rtx x, enum machine_mode mode) | |
3343 | { | |
3344 | return cached_num_sign_bit_copies (x, mode, NULL_RTX, VOIDmode, 0); | |
3345 | } | |
3346 | ||
3347 | /* The function cached_nonzero_bits is a wrapper around nonzero_bits1. | |
3348 | It avoids exponential behavior in nonzero_bits1 when X has | |
3349 | identical subexpressions on the first or the second level. */ | |
3350 | ||
3351 | static unsigned HOST_WIDE_INT | |
3352 | cached_nonzero_bits (rtx x, enum machine_mode mode, rtx known_x, | |
3353 | enum machine_mode known_mode, | |
3354 | unsigned HOST_WIDE_INT known_ret) | |
3355 | { | |
3356 | if (x == known_x && mode == known_mode) | |
3357 | return known_ret; | |
3358 | ||
3359 | /* Try to find identical subexpressions. If found call | |
3360 | nonzero_bits1 on X with the subexpressions as KNOWN_X and the | |
3361 | precomputed value for the subexpression as KNOWN_RET. */ | |
3362 | ||
3363 | if (ARITHMETIC_P (x)) | |
3364 | { | |
3365 | rtx x0 = XEXP (x, 0); | |
3366 | rtx x1 = XEXP (x, 1); | |
3367 | ||
3368 | /* Check the first level. */ | |
3369 | if (x0 == x1) | |
3370 | return nonzero_bits1 (x, mode, x0, mode, | |
3371 | cached_nonzero_bits (x0, mode, known_x, | |
3372 | known_mode, known_ret)); | |
3373 | ||
3374 | /* Check the second level. */ | |
3375 | if (ARITHMETIC_P (x0) | |
3376 | && (x1 == XEXP (x0, 0) || x1 == XEXP (x0, 1))) | |
3377 | return nonzero_bits1 (x, mode, x1, mode, | |
3378 | cached_nonzero_bits (x1, mode, known_x, | |
3379 | known_mode, known_ret)); | |
3380 | ||
3381 | if (ARITHMETIC_P (x1) | |
3382 | && (x0 == XEXP (x1, 0) || x0 == XEXP (x1, 1))) | |
3383 | return nonzero_bits1 (x, mode, x0, mode, | |
3384 | cached_nonzero_bits (x0, mode, known_x, | |
3385 | known_mode, known_ret)); | |
3386 | } | |
3387 | ||
3388 | return nonzero_bits1 (x, mode, known_x, known_mode, known_ret); | |
3389 | } | |
3390 | ||
3391 | /* We let num_sign_bit_copies recur into nonzero_bits as that is useful. | |
3392 | We don't let nonzero_bits recur into num_sign_bit_copies, because that | |
3393 | is less useful. We can't allow both, because that results in exponential | |
3394 | run time recursion. There is a nullstone testcase that triggered | |
3395 | this. This macro avoids accidental uses of num_sign_bit_copies. */ | |
3396 | #define cached_num_sign_bit_copies sorry_i_am_preventing_exponential_behavior | |
3397 | ||
3398 | /* Given an expression, X, compute which bits in X can be nonzero. | |
3399 | We don't care about bits outside of those defined in MODE. | |
3400 | ||
3401 | For most X this is simply GET_MODE_MASK (GET_MODE (MODE)), but if X is | |
3402 | an arithmetic operation, we can do better. */ | |
3403 | ||
3404 | static unsigned HOST_WIDE_INT | |
3405 | nonzero_bits1 (rtx x, enum machine_mode mode, rtx known_x, | |
3406 | enum machine_mode known_mode, | |
3407 | unsigned HOST_WIDE_INT known_ret) | |
3408 | { | |
3409 | unsigned HOST_WIDE_INT nonzero = GET_MODE_MASK (mode); | |
3410 | unsigned HOST_WIDE_INT inner_nz; | |
3411 | enum rtx_code code; | |
3412 | unsigned int mode_width = GET_MODE_BITSIZE (mode); | |
3413 | ||
3414 | /* For floating-point values, assume all bits are needed. */ | |
3415 | if (FLOAT_MODE_P (GET_MODE (x)) || FLOAT_MODE_P (mode)) | |
3416 | return nonzero; | |
3417 | ||
3418 | /* If X is wider than MODE, use its mode instead. */ | |
3419 | if (GET_MODE_BITSIZE (GET_MODE (x)) > mode_width) | |
3420 | { | |
3421 | mode = GET_MODE (x); | |
3422 | nonzero = GET_MODE_MASK (mode); | |
3423 | mode_width = GET_MODE_BITSIZE (mode); | |
3424 | } | |
3425 | ||
3426 | if (mode_width > HOST_BITS_PER_WIDE_INT) | |
3427 | /* Our only callers in this case look for single bit values. So | |
3428 | just return the mode mask. Those tests will then be false. */ | |
3429 | return nonzero; | |
3430 | ||
3431 | #ifndef WORD_REGISTER_OPERATIONS | |
3432 | /* If MODE is wider than X, but both are a single word for both the host | |
3433 | and target machines, we can compute this from which bits of the | |
3434 | object might be nonzero in its own mode, taking into account the fact | |
3435 | that on many CISC machines, accessing an object in a wider mode | |
3436 | causes the high-order bits to become undefined. So they are | |
3437 | not known to be zero. */ | |
3438 | ||
3439 | if (GET_MODE (x) != VOIDmode && GET_MODE (x) != mode | |
3440 | && GET_MODE_BITSIZE (GET_MODE (x)) <= BITS_PER_WORD | |
3441 | && GET_MODE_BITSIZE (GET_MODE (x)) <= HOST_BITS_PER_WIDE_INT | |
3442 | && GET_MODE_BITSIZE (mode) > GET_MODE_BITSIZE (GET_MODE (x))) | |
3443 | { | |
3444 | nonzero &= cached_nonzero_bits (x, GET_MODE (x), | |
3445 | known_x, known_mode, known_ret); | |
3446 | nonzero |= GET_MODE_MASK (mode) & ~GET_MODE_MASK (GET_MODE (x)); | |
3447 | return nonzero; | |
3448 | } | |
3449 | #endif | |
3450 | ||
3451 | code = GET_CODE (x); | |
3452 | switch (code) | |
3453 | { | |
3454 | case REG: | |
3455 | #if defined(POINTERS_EXTEND_UNSIGNED) && !defined(HAVE_ptr_extend) | |
3456 | /* If pointers extend unsigned and this is a pointer in Pmode, say that | |
3457 | all the bits above ptr_mode are known to be zero. */ | |
3458 | if (POINTERS_EXTEND_UNSIGNED && GET_MODE (x) == Pmode | |
3459 | && REG_POINTER (x)) | |
3460 | nonzero &= GET_MODE_MASK (ptr_mode); | |
3461 | #endif | |
3462 | ||
3463 | /* Include declared information about alignment of pointers. */ | |
3464 | /* ??? We don't properly preserve REG_POINTER changes across | |
3465 | pointer-to-integer casts, so we can't trust it except for | |
3466 | things that we know must be pointers. See execute/960116-1.c. */ | |
3467 | if ((x == stack_pointer_rtx | |
3468 | || x == frame_pointer_rtx | |
3469 | || x == arg_pointer_rtx) | |
3470 | && REGNO_POINTER_ALIGN (REGNO (x))) | |
3471 | { | |
3472 | unsigned HOST_WIDE_INT alignment | |
3473 | = REGNO_POINTER_ALIGN (REGNO (x)) / BITS_PER_UNIT; | |
3474 | ||
3475 | #ifdef PUSH_ROUNDING | |
3476 | /* If PUSH_ROUNDING is defined, it is possible for the | |
3477 | stack to be momentarily aligned only to that amount, | |
3478 | so we pick the least alignment. */ | |
3479 | if (x == stack_pointer_rtx && PUSH_ARGS) | |
3480 | alignment = MIN ((unsigned HOST_WIDE_INT) PUSH_ROUNDING (1), | |
3481 | alignment); | |
3482 | #endif | |
3483 | ||
3484 | nonzero &= ~(alignment - 1); | |
3485 | } | |
3486 | ||
3487 | { | |
3488 | unsigned HOST_WIDE_INT nonzero_for_hook = nonzero; | |
3489 | rtx new = rtl_hooks.reg_nonzero_bits (x, mode, known_x, | |
3490 | known_mode, known_ret, | |
3491 | &nonzero_for_hook); | |
3492 | ||
3493 | if (new) | |
3494 | nonzero_for_hook &= cached_nonzero_bits (new, mode, known_x, | |
3495 | known_mode, known_ret); | |
3496 | ||
3497 | return nonzero_for_hook; | |
3498 | } | |
3499 | ||
3500 | case CONST_INT: | |
3501 | #ifdef SHORT_IMMEDIATES_SIGN_EXTEND | |
3502 | /* If X is negative in MODE, sign-extend the value. */ | |
3503 | if (INTVAL (x) > 0 && mode_width < BITS_PER_WORD | |
3504 | && 0 != (INTVAL (x) & ((HOST_WIDE_INT) 1 << (mode_width - 1)))) | |
3505 | return (INTVAL (x) | ((HOST_WIDE_INT) (-1) << mode_width)); | |
3506 | #endif | |
3507 | ||
3508 | return INTVAL (x); | |
3509 | ||
3510 | case MEM: | |
3511 | #ifdef LOAD_EXTEND_OP | |
3512 | /* In many, if not most, RISC machines, reading a byte from memory | |
3513 | zeros the rest of the register. Noticing that fact saves a lot | |
3514 | of extra zero-extends. */ | |
3515 | if (LOAD_EXTEND_OP (GET_MODE (x)) == ZERO_EXTEND) | |
3516 | nonzero &= GET_MODE_MASK (GET_MODE (x)); | |
3517 | #endif | |
3518 | break; | |
3519 | ||
3520 | case EQ: case NE: | |
3521 | case UNEQ: case LTGT: | |
3522 | case GT: case GTU: case UNGT: | |
3523 | case LT: case LTU: case UNLT: | |
3524 | case GE: case GEU: case UNGE: | |
3525 | case LE: case LEU: case UNLE: | |
3526 | case UNORDERED: case ORDERED: | |
2f93eea8 PB |
3527 | /* If this produces an integer result, we know which bits are set. |
3528 | Code here used to clear bits outside the mode of X, but that is | |
3529 | now done above. */ | |
505ac507 RH |
3530 | /* Mind that MODE is the mode the caller wants to look at this |
3531 | operation in, and not the actual operation mode. We can wind | |
3532 | up with (subreg:DI (gt:V4HI x y)), and we don't have anything | |
3533 | that describes the results of a vector compare. */ | |
3534 | if (GET_MODE_CLASS (GET_MODE (x)) == MODE_INT | |
2f93eea8 PB |
3535 | && mode_width <= HOST_BITS_PER_WIDE_INT) |
3536 | nonzero = STORE_FLAG_VALUE; | |
3537 | break; | |
3538 | ||
3539 | case NEG: | |
3540 | #if 0 | |
3541 | /* Disabled to avoid exponential mutual recursion between nonzero_bits | |
3542 | and num_sign_bit_copies. */ | |
3543 | if (num_sign_bit_copies (XEXP (x, 0), GET_MODE (x)) | |
3544 | == GET_MODE_BITSIZE (GET_MODE (x))) | |
3545 | nonzero = 1; | |
3546 | #endif | |
3547 | ||
3548 | if (GET_MODE_SIZE (GET_MODE (x)) < mode_width) | |
3549 | nonzero |= (GET_MODE_MASK (mode) & ~GET_MODE_MASK (GET_MODE (x))); | |
3550 | break; | |
3551 | ||
3552 | case ABS: | |
3553 | #if 0 | |
3554 | /* Disabled to avoid exponential mutual recursion between nonzero_bits | |
3555 | and num_sign_bit_copies. */ | |
3556 | if (num_sign_bit_copies (XEXP (x, 0), GET_MODE (x)) | |
3557 | == GET_MODE_BITSIZE (GET_MODE (x))) | |
3558 | nonzero = 1; | |
3559 | #endif | |
3560 | break; | |
3561 | ||
3562 | case TRUNCATE: | |
3563 | nonzero &= (cached_nonzero_bits (XEXP (x, 0), mode, | |
3564 | known_x, known_mode, known_ret) | |
3565 | & GET_MODE_MASK (mode)); | |
3566 | break; | |
3567 | ||
3568 | case ZERO_EXTEND: | |
3569 | nonzero &= cached_nonzero_bits (XEXP (x, 0), mode, | |
3570 | known_x, known_mode, known_ret); | |
3571 | if (GET_MODE (XEXP (x, 0)) != VOIDmode) | |
3572 | nonzero &= GET_MODE_MASK (GET_MODE (XEXP (x, 0))); | |
3573 | break; | |
3574 | ||
3575 | case SIGN_EXTEND: | |
3576 | /* If the sign bit is known clear, this is the same as ZERO_EXTEND. | |
3577 | Otherwise, show all the bits in the outer mode but not the inner | |
3578 | may be nonzero. */ | |
3579 | inner_nz = cached_nonzero_bits (XEXP (x, 0), mode, | |
3580 | known_x, known_mode, known_ret); | |
3581 | if (GET_MODE (XEXP (x, 0)) != VOIDmode) | |
3582 | { | |
3583 | inner_nz &= GET_MODE_MASK (GET_MODE (XEXP (x, 0))); | |
3584 | if (inner_nz | |
3585 | & (((HOST_WIDE_INT) 1 | |
3586 | << (GET_MODE_BITSIZE (GET_MODE (XEXP (x, 0))) - 1)))) | |
3587 | inner_nz |= (GET_MODE_MASK (mode) | |
3588 | & ~GET_MODE_MASK (GET_MODE (XEXP (x, 0)))); | |
3589 | } | |
3590 | ||
3591 | nonzero &= inner_nz; | |
3592 | break; | |
3593 | ||
3594 | case AND: | |
3595 | nonzero &= cached_nonzero_bits (XEXP (x, 0), mode, | |
3596 | known_x, known_mode, known_ret) | |
3597 | & cached_nonzero_bits (XEXP (x, 1), mode, | |
3598 | known_x, known_mode, known_ret); | |
3599 | break; | |
3600 | ||
3601 | case XOR: case IOR: | |
3602 | case UMIN: case UMAX: case SMIN: case SMAX: | |
3603 | { | |
3604 | unsigned HOST_WIDE_INT nonzero0 = | |
3605 | cached_nonzero_bits (XEXP (x, 0), mode, | |
3606 | known_x, known_mode, known_ret); | |
3607 | ||
3608 | /* Don't call nonzero_bits for the second time if it cannot change | |
3609 | anything. */ | |
3610 | if ((nonzero & nonzero0) != nonzero) | |
3611 | nonzero &= nonzero0 | |
3612 | | cached_nonzero_bits (XEXP (x, 1), mode, | |
3613 | known_x, known_mode, known_ret); | |
3614 | } | |
3615 | break; | |
3616 | ||
3617 | case PLUS: case MINUS: | |
3618 | case MULT: | |
3619 | case DIV: case UDIV: | |
3620 | case MOD: case UMOD: | |
3621 | /* We can apply the rules of arithmetic to compute the number of | |
3622 | high- and low-order zero bits of these operations. We start by | |
3623 | computing the width (position of the highest-order nonzero bit) | |
3624 | and the number of low-order zero bits for each value. */ | |
3625 | { | |
3626 | unsigned HOST_WIDE_INT nz0 = | |
3627 | cached_nonzero_bits (XEXP (x, 0), mode, | |
3628 | known_x, known_mode, known_ret); | |
3629 | unsigned HOST_WIDE_INT nz1 = | |
3630 | cached_nonzero_bits (XEXP (x, 1), mode, | |
3631 | known_x, known_mode, known_ret); | |
3632 | int sign_index = GET_MODE_BITSIZE (GET_MODE (x)) - 1; | |
3633 | int width0 = floor_log2 (nz0) + 1; | |
3634 | int width1 = floor_log2 (nz1) + 1; | |
3635 | int low0 = floor_log2 (nz0 & -nz0); | |
3636 | int low1 = floor_log2 (nz1 & -nz1); | |
3637 | HOST_WIDE_INT op0_maybe_minusp | |
3638 | = (nz0 & ((HOST_WIDE_INT) 1 << sign_index)); | |
3639 | HOST_WIDE_INT op1_maybe_minusp | |
3640 | = (nz1 & ((HOST_WIDE_INT) 1 << sign_index)); | |
3641 | unsigned int result_width = mode_width; | |
3642 | int result_low = 0; | |
3643 | ||
3644 | switch (code) | |
3645 | { | |
3646 | case PLUS: | |
3647 | result_width = MAX (width0, width1) + 1; | |
3648 | result_low = MIN (low0, low1); | |
3649 | break; | |
3650 | case MINUS: | |
3651 | result_low = MIN (low0, low1); | |
3652 | break; | |
3653 | case MULT: | |
3654 | result_width = width0 + width1; | |
3655 | result_low = low0 + low1; | |
3656 | break; | |
3657 | case DIV: | |
3658 | if (width1 == 0) | |
3659 | break; | |
3660 | if (! op0_maybe_minusp && ! op1_maybe_minusp) | |
3661 | result_width = width0; | |
3662 | break; | |
3663 | case UDIV: | |
3664 | if (width1 == 0) | |
3665 | break; | |
3666 | result_width = width0; | |
3667 | break; | |
3668 | case MOD: | |
3669 | if (width1 == 0) | |
3670 | break; | |
3671 | if (! op0_maybe_minusp && ! op1_maybe_minusp) | |
3672 | result_width = MIN (width0, width1); | |
3673 | result_low = MIN (low0, low1); | |
3674 | break; | |
3675 | case UMOD: | |
3676 | if (width1 == 0) | |
3677 | break; | |
3678 | result_width = MIN (width0, width1); | |
3679 | result_low = MIN (low0, low1); | |
3680 | break; | |
3681 | default: | |
41374e13 | 3682 | gcc_unreachable (); |
2f93eea8 PB |
3683 | } |
3684 | ||
3685 | if (result_width < mode_width) | |
3686 | nonzero &= ((HOST_WIDE_INT) 1 << result_width) - 1; | |
3687 | ||
3688 | if (result_low > 0) | |
3689 | nonzero &= ~(((HOST_WIDE_INT) 1 << result_low) - 1); | |
3690 | ||
3691 | #ifdef POINTERS_EXTEND_UNSIGNED | |
3692 | /* If pointers extend unsigned and this is an addition or subtraction | |
3693 | to a pointer in Pmode, all the bits above ptr_mode are known to be | |
3694 | zero. */ | |
3695 | if (POINTERS_EXTEND_UNSIGNED > 0 && GET_MODE (x) == Pmode | |
3696 | && (code == PLUS || code == MINUS) | |
f8cfc6aa | 3697 | && REG_P (XEXP (x, 0)) && REG_POINTER (XEXP (x, 0))) |
2f93eea8 PB |
3698 | nonzero &= GET_MODE_MASK (ptr_mode); |
3699 | #endif | |
3700 | } | |
3701 | break; | |
3702 | ||
3703 | case ZERO_EXTRACT: | |
3704 | if (GET_CODE (XEXP (x, 1)) == CONST_INT | |
3705 | && INTVAL (XEXP (x, 1)) < HOST_BITS_PER_WIDE_INT) | |
3706 | nonzero &= ((HOST_WIDE_INT) 1 << INTVAL (XEXP (x, 1))) - 1; | |
3707 | break; | |
3708 | ||
3709 | case SUBREG: | |
3710 | /* If this is a SUBREG formed for a promoted variable that has | |
3711 | been zero-extended, we know that at least the high-order bits | |
3712 | are zero, though others might be too. */ | |
3713 | ||
3714 | if (SUBREG_PROMOTED_VAR_P (x) && SUBREG_PROMOTED_UNSIGNED_P (x) > 0) | |
3715 | nonzero = GET_MODE_MASK (GET_MODE (x)) | |
3716 | & cached_nonzero_bits (SUBREG_REG (x), GET_MODE (x), | |
3717 | known_x, known_mode, known_ret); | |
3718 | ||
3719 | /* If the inner mode is a single word for both the host and target | |
3720 | machines, we can compute this from which bits of the inner | |
3721 | object might be nonzero. */ | |
3722 | if (GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (x))) <= BITS_PER_WORD | |
3723 | && (GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (x))) | |
3724 | <= HOST_BITS_PER_WIDE_INT)) | |
3725 | { | |
3726 | nonzero &= cached_nonzero_bits (SUBREG_REG (x), mode, | |
3727 | known_x, known_mode, known_ret); | |
3728 | ||
3729 | #if defined (WORD_REGISTER_OPERATIONS) && defined (LOAD_EXTEND_OP) | |
3730 | /* If this is a typical RISC machine, we only have to worry | |
3731 | about the way loads are extended. */ | |
3732 | if ((LOAD_EXTEND_OP (GET_MODE (SUBREG_REG (x))) == SIGN_EXTEND | |
3733 | ? (((nonzero | |
3734 | & (((unsigned HOST_WIDE_INT) 1 | |
3735 | << (GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (x))) - 1)))) | |
3736 | != 0)) | |
3737 | : LOAD_EXTEND_OP (GET_MODE (SUBREG_REG (x))) != ZERO_EXTEND) | |
3c0cb5de | 3738 | || !MEM_P (SUBREG_REG (x))) |
2f93eea8 PB |
3739 | #endif |
3740 | { | |
3741 | /* On many CISC machines, accessing an object in a wider mode | |
3742 | causes the high-order bits to become undefined. So they are | |
3743 | not known to be zero. */ | |
3744 | if (GET_MODE_SIZE (GET_MODE (x)) | |
3745 | > GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) | |
3746 | nonzero |= (GET_MODE_MASK (GET_MODE (x)) | |
3747 | & ~GET_MODE_MASK (GET_MODE (SUBREG_REG (x)))); | |
3748 | } | |
3749 | } | |
3750 | break; | |
3751 | ||
3752 | case ASHIFTRT: | |
3753 | case LSHIFTRT: | |
3754 | case ASHIFT: | |
3755 | case ROTATE: | |
3756 | /* The nonzero bits are in two classes: any bits within MODE | |
3757 | that aren't in GET_MODE (x) are always significant. The rest of the | |
3758 | nonzero bits are those that are significant in the operand of | |
3759 | the shift when shifted the appropriate number of bits. This | |
3760 | shows that high-order bits are cleared by the right shift and | |
3761 | low-order bits by left shifts. */ | |
3762 | if (GET_CODE (XEXP (x, 1)) == CONST_INT | |
3763 | && INTVAL (XEXP (x, 1)) >= 0 | |
3764 | && INTVAL (XEXP (x, 1)) < HOST_BITS_PER_WIDE_INT) | |
3765 | { | |
3766 | enum machine_mode inner_mode = GET_MODE (x); | |
3767 | unsigned int width = GET_MODE_BITSIZE (inner_mode); | |
3768 | int count = INTVAL (XEXP (x, 1)); | |
3769 | unsigned HOST_WIDE_INT mode_mask = GET_MODE_MASK (inner_mode); | |
3770 | unsigned HOST_WIDE_INT op_nonzero = | |
3771 | cached_nonzero_bits (XEXP (x, 0), mode, | |
3772 | known_x, known_mode, known_ret); | |
3773 | unsigned HOST_WIDE_INT inner = op_nonzero & mode_mask; | |
3774 | unsigned HOST_WIDE_INT outer = 0; | |
3775 | ||
3776 | if (mode_width > width) | |
3777 | outer = (op_nonzero & nonzero & ~mode_mask); | |
3778 | ||
3779 | if (code == LSHIFTRT) | |
3780 | inner >>= count; | |
3781 | else if (code == ASHIFTRT) | |
3782 | { | |
3783 | inner >>= count; | |
3784 | ||
3785 | /* If the sign bit may have been nonzero before the shift, we | |
3786 | need to mark all the places it could have been copied to | |
3787 | by the shift as possibly nonzero. */ | |
3788 | if (inner & ((HOST_WIDE_INT) 1 << (width - 1 - count))) | |
3789 | inner |= (((HOST_WIDE_INT) 1 << count) - 1) << (width - count); | |
3790 | } | |
3791 | else if (code == ASHIFT) | |
3792 | inner <<= count; | |
3793 | else | |
3794 | inner = ((inner << (count % width) | |
3795 | | (inner >> (width - (count % width)))) & mode_mask); | |
3796 | ||
3797 | nonzero &= (outer | inner); | |
3798 | } | |
3799 | break; | |
3800 | ||
3801 | case FFS: | |
3802 | case POPCOUNT: | |
3803 | /* This is at most the number of bits in the mode. */ | |
3804 | nonzero = ((HOST_WIDE_INT) 2 << (floor_log2 (mode_width))) - 1; | |
3805 | break; | |
3806 | ||
3807 | case CLZ: | |
3808 | /* If CLZ has a known value at zero, then the nonzero bits are | |
3809 | that value, plus the number of bits in the mode minus one. */ | |
3810 | if (CLZ_DEFINED_VALUE_AT_ZERO (mode, nonzero)) | |
3811 | nonzero |= ((HOST_WIDE_INT) 1 << (floor_log2 (mode_width))) - 1; | |
3812 | else | |
3813 | nonzero = -1; | |
3814 | break; | |
3815 | ||
3816 | case CTZ: | |
3817 | /* If CTZ has a known value at zero, then the nonzero bits are | |
3818 | that value, plus the number of bits in the mode minus one. */ | |
3819 | if (CTZ_DEFINED_VALUE_AT_ZERO (mode, nonzero)) | |
3820 | nonzero |= ((HOST_WIDE_INT) 1 << (floor_log2 (mode_width))) - 1; | |
3821 | else | |
3822 | nonzero = -1; | |
3823 | break; | |
3824 | ||
3825 | case PARITY: | |
3826 | nonzero = 1; | |
3827 | break; | |
3828 | ||
3829 | case IF_THEN_ELSE: | |
3830 | { | |
3831 | unsigned HOST_WIDE_INT nonzero_true = | |
3832 | cached_nonzero_bits (XEXP (x, 1), mode, | |
3833 | known_x, known_mode, known_ret); | |
3834 | ||
3835 | /* Don't call nonzero_bits for the second time if it cannot change | |
3836 | anything. */ | |
3837 | if ((nonzero & nonzero_true) != nonzero) | |
3838 | nonzero &= nonzero_true | |
3839 | | cached_nonzero_bits (XEXP (x, 2), mode, | |
3840 | known_x, known_mode, known_ret); | |
3841 | } | |
3842 | break; | |
3843 | ||
3844 | default: | |
3845 | break; | |
3846 | } | |
3847 | ||
3848 | return nonzero; | |
3849 | } | |
3850 | ||
3851 | /* See the macro definition above. */ | |
3852 | #undef cached_num_sign_bit_copies | |
3853 | ||
3854 | \f | |
3855 | /* The function cached_num_sign_bit_copies is a wrapper around | |
3856 | num_sign_bit_copies1. It avoids exponential behavior in | |
3857 | num_sign_bit_copies1 when X has identical subexpressions on the | |
3858 | first or the second level. */ | |
3859 | ||
3860 | static unsigned int | |
3861 | cached_num_sign_bit_copies (rtx x, enum machine_mode mode, rtx known_x, | |
3862 | enum machine_mode known_mode, | |
3863 | unsigned int known_ret) | |
3864 | { | |
3865 | if (x == known_x && mode == known_mode) | |
3866 | return known_ret; | |
3867 | ||
3868 | /* Try to find identical subexpressions. If found call | |
3869 | num_sign_bit_copies1 on X with the subexpressions as KNOWN_X and | |
3870 | the precomputed value for the subexpression as KNOWN_RET. */ | |
3871 | ||
3872 | if (ARITHMETIC_P (x)) | |
3873 | { | |
3874 | rtx x0 = XEXP (x, 0); | |
3875 | rtx x1 = XEXP (x, 1); | |
3876 | ||
3877 | /* Check the first level. */ | |
3878 | if (x0 == x1) | |
3879 | return | |
3880 | num_sign_bit_copies1 (x, mode, x0, mode, | |
3881 | cached_num_sign_bit_copies (x0, mode, known_x, | |
3882 | known_mode, | |
3883 | known_ret)); | |
3884 | ||
3885 | /* Check the second level. */ | |
3886 | if (ARITHMETIC_P (x0) | |
3887 | && (x1 == XEXP (x0, 0) || x1 == XEXP (x0, 1))) | |
3888 | return | |
3889 | num_sign_bit_copies1 (x, mode, x1, mode, | |
3890 | cached_num_sign_bit_copies (x1, mode, known_x, | |
3891 | known_mode, | |
3892 | known_ret)); | |
3893 | ||
3894 | if (ARITHMETIC_P (x1) | |
3895 | && (x0 == XEXP (x1, 0) || x0 == XEXP (x1, 1))) | |
3896 | return | |
3897 | num_sign_bit_copies1 (x, mode, x0, mode, | |
3898 | cached_num_sign_bit_copies (x0, mode, known_x, | |
3899 | known_mode, | |
3900 | known_ret)); | |
3901 | } | |
3902 | ||
3903 | return num_sign_bit_copies1 (x, mode, known_x, known_mode, known_ret); | |
3904 | } | |
3905 | ||
3906 | /* Return the number of bits at the high-order end of X that are known to | |
3907 | be equal to the sign bit. X will be used in mode MODE; if MODE is | |
3908 | VOIDmode, X will be used in its own mode. The returned value will always | |
3909 | be between 1 and the number of bits in MODE. */ | |
3910 | ||
3911 | static unsigned int | |
3912 | num_sign_bit_copies1 (rtx x, enum machine_mode mode, rtx known_x, | |
3913 | enum machine_mode known_mode, | |
3914 | unsigned int known_ret) | |
3915 | { | |
3916 | enum rtx_code code = GET_CODE (x); | |
3917 | unsigned int bitwidth = GET_MODE_BITSIZE (mode); | |
3918 | int num0, num1, result; | |
3919 | unsigned HOST_WIDE_INT nonzero; | |
3920 | ||
3921 | /* If we weren't given a mode, use the mode of X. If the mode is still | |
3922 | VOIDmode, we don't know anything. Likewise if one of the modes is | |
3923 | floating-point. */ | |
3924 | ||
3925 | if (mode == VOIDmode) | |
3926 | mode = GET_MODE (x); | |
3927 | ||
3928 | if (mode == VOIDmode || FLOAT_MODE_P (mode) || FLOAT_MODE_P (GET_MODE (x))) | |
3929 | return 1; | |
3930 | ||
3931 | /* For a smaller object, just ignore the high bits. */ | |
3932 | if (bitwidth < GET_MODE_BITSIZE (GET_MODE (x))) | |
3933 | { | |
3934 | num0 = cached_num_sign_bit_copies (x, GET_MODE (x), | |
3935 | known_x, known_mode, known_ret); | |
3936 | return MAX (1, | |
3937 | num0 - (int) (GET_MODE_BITSIZE (GET_MODE (x)) - bitwidth)); | |
3938 | } | |
3939 | ||
3940 | if (GET_MODE (x) != VOIDmode && bitwidth > GET_MODE_BITSIZE (GET_MODE (x))) | |
3941 | { | |
3942 | #ifndef WORD_REGISTER_OPERATIONS | |
3943 | /* If this machine does not do all register operations on the entire | |
3944 | register and MODE is wider than the mode of X, we can say nothing | |
3945 | at all about the high-order bits. */ | |
3946 | return 1; | |
3947 | #else | |
3948 | /* Likewise on machines that do, if the mode of the object is smaller | |
3949 | than a word and loads of that size don't sign extend, we can say | |
3950 | nothing about the high order bits. */ | |
3951 | if (GET_MODE_BITSIZE (GET_MODE (x)) < BITS_PER_WORD | |
3952 | #ifdef LOAD_EXTEND_OP | |
3953 | && LOAD_EXTEND_OP (GET_MODE (x)) != SIGN_EXTEND | |
3954 | #endif | |
3955 | ) | |
3956 | return 1; | |
3957 | #endif | |
3958 | } | |
3959 | ||
3960 | switch (code) | |
3961 | { | |
3962 | case REG: | |
3963 | ||
3964 | #if defined(POINTERS_EXTEND_UNSIGNED) && !defined(HAVE_ptr_extend) | |
3965 | /* If pointers extend signed and this is a pointer in Pmode, say that | |
3966 | all the bits above ptr_mode are known to be sign bit copies. */ | |
3967 | if (! POINTERS_EXTEND_UNSIGNED && GET_MODE (x) == Pmode && mode == Pmode | |
3968 | && REG_POINTER (x)) | |
3969 | return GET_MODE_BITSIZE (Pmode) - GET_MODE_BITSIZE (ptr_mode) + 1; | |
3970 | #endif | |
3971 | ||
3972 | { | |
3973 | unsigned int copies_for_hook = 1, copies = 1; | |
3974 | rtx new = rtl_hooks.reg_num_sign_bit_copies (x, mode, known_x, | |
3975 | known_mode, known_ret, | |
3976 | &copies_for_hook); | |
3977 | ||
3978 | if (new) | |
3979 | copies = cached_num_sign_bit_copies (new, mode, known_x, | |
3980 | known_mode, known_ret); | |
3981 | ||
3982 | if (copies > 1 || copies_for_hook > 1) | |
3983 | return MAX (copies, copies_for_hook); | |
3984 | ||
3985 | /* Else, use nonzero_bits to guess num_sign_bit_copies (see below). */ | |
3986 | } | |
3987 | break; | |
3988 | ||
3989 | case MEM: | |
3990 | #ifdef LOAD_EXTEND_OP | |
3991 | /* Some RISC machines sign-extend all loads of smaller than a word. */ | |
3992 | if (LOAD_EXTEND_OP (GET_MODE (x)) == SIGN_EXTEND) | |
3993 | return MAX (1, ((int) bitwidth | |
3994 | - (int) GET_MODE_BITSIZE (GET_MODE (x)) + 1)); | |
3995 | #endif | |
3996 | break; | |
3997 | ||
3998 | case CONST_INT: | |
3999 | /* If the constant is negative, take its 1's complement and remask. | |
4000 | Then see how many zero bits we have. */ | |
4001 | nonzero = INTVAL (x) & GET_MODE_MASK (mode); | |
4002 | if (bitwidth <= HOST_BITS_PER_WIDE_INT | |
4003 | && (nonzero & ((HOST_WIDE_INT) 1 << (bitwidth - 1))) != 0) | |
4004 | nonzero = (~nonzero) & GET_MODE_MASK (mode); | |
4005 | ||
4006 | return (nonzero == 0 ? bitwidth : bitwidth - floor_log2 (nonzero) - 1); | |
4007 | ||
4008 | case SUBREG: | |
4009 | /* If this is a SUBREG for a promoted object that is sign-extended | |
4010 | and we are looking at it in a wider mode, we know that at least the | |
4011 | high-order bits are known to be sign bit copies. */ | |
4012 | ||
4013 | if (SUBREG_PROMOTED_VAR_P (x) && ! SUBREG_PROMOTED_UNSIGNED_P (x)) | |
4014 | { | |
4015 | num0 = cached_num_sign_bit_copies (SUBREG_REG (x), mode, | |
4016 | known_x, known_mode, known_ret); | |
4017 | return MAX ((int) bitwidth | |
4018 | - (int) GET_MODE_BITSIZE (GET_MODE (x)) + 1, | |
4019 | num0); | |
4020 | } | |
4021 | ||
4022 | /* For a smaller object, just ignore the high bits. */ | |
4023 | if (bitwidth <= GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (x)))) | |
4024 | { | |
4025 | num0 = cached_num_sign_bit_copies (SUBREG_REG (x), VOIDmode, | |
4026 | known_x, known_mode, known_ret); | |
4027 | return MAX (1, (num0 | |
4028 | - (int) (GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (x))) | |
4029 | - bitwidth))); | |
4030 | } | |
4031 | ||
4032 | #ifdef WORD_REGISTER_OPERATIONS | |
4033 | #ifdef LOAD_EXTEND_OP | |
4034 | /* For paradoxical SUBREGs on machines where all register operations | |
4035 | affect the entire register, just look inside. Note that we are | |
4036 | passing MODE to the recursive call, so the number of sign bit copies | |
4037 | will remain relative to that mode, not the inner mode. */ | |
4038 | ||
4039 | /* This works only if loads sign extend. Otherwise, if we get a | |
4040 | reload for the inner part, it may be loaded from the stack, and | |
4041 | then we lose all sign bit copies that existed before the store | |
4042 | to the stack. */ | |
4043 | ||
4044 | if ((GET_MODE_SIZE (GET_MODE (x)) | |
4045 | > GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) | |
4046 | && LOAD_EXTEND_OP (GET_MODE (SUBREG_REG (x))) == SIGN_EXTEND | |
3c0cb5de | 4047 | && MEM_P (SUBREG_REG (x))) |
2f93eea8 PB |
4048 | return cached_num_sign_bit_copies (SUBREG_REG (x), mode, |
4049 | known_x, known_mode, known_ret); | |
4050 | #endif | |
4051 | #endif | |
4052 | break; | |
4053 | ||
4054 | case SIGN_EXTRACT: | |
4055 | if (GET_CODE (XEXP (x, 1)) == CONST_INT) | |
4056 | return MAX (1, (int) bitwidth - INTVAL (XEXP (x, 1))); | |
4057 | break; | |
4058 | ||
4059 | case SIGN_EXTEND: | |
4060 | return (bitwidth - GET_MODE_BITSIZE (GET_MODE (XEXP (x, 0))) | |
4061 | + cached_num_sign_bit_copies (XEXP (x, 0), VOIDmode, | |
4062 | known_x, known_mode, known_ret)); | |
4063 | ||
4064 | case TRUNCATE: | |
4065 | /* For a smaller object, just ignore the high bits. */ | |
4066 | num0 = cached_num_sign_bit_copies (XEXP (x, 0), VOIDmode, | |
4067 | known_x, known_mode, known_ret); | |
4068 | return MAX (1, (num0 - (int) (GET_MODE_BITSIZE (GET_MODE (XEXP (x, 0))) | |
4069 | - bitwidth))); | |
4070 | ||
4071 | case NOT: | |
4072 | return cached_num_sign_bit_copies (XEXP (x, 0), mode, | |
4073 | known_x, known_mode, known_ret); | |
4074 | ||
4075 | case ROTATE: case ROTATERT: | |
4076 | /* If we are rotating left by a number of bits less than the number | |
4077 | of sign bit copies, we can just subtract that amount from the | |
4078 | number. */ | |
4079 | if (GET_CODE (XEXP (x, 1)) == CONST_INT | |
4080 | && INTVAL (XEXP (x, 1)) >= 0 | |
4081 | && INTVAL (XEXP (x, 1)) < (int) bitwidth) | |
4082 | { | |
4083 | num0 = cached_num_sign_bit_copies (XEXP (x, 0), mode, | |
4084 | known_x, known_mode, known_ret); | |
4085 | return MAX (1, num0 - (code == ROTATE ? INTVAL (XEXP (x, 1)) | |
4086 | : (int) bitwidth - INTVAL (XEXP (x, 1)))); | |
4087 | } | |
4088 | break; | |
4089 | ||
4090 | case NEG: | |
4091 | /* In general, this subtracts one sign bit copy. But if the value | |
4092 | is known to be positive, the number of sign bit copies is the | |
4093 | same as that of the input. Finally, if the input has just one bit | |
4094 | that might be nonzero, all the bits are copies of the sign bit. */ | |
4095 | num0 = cached_num_sign_bit_copies (XEXP (x, 0), mode, | |
4096 | known_x, known_mode, known_ret); | |
4097 | if (bitwidth > HOST_BITS_PER_WIDE_INT) | |
4098 | return num0 > 1 ? num0 - 1 : 1; | |
4099 | ||
4100 | nonzero = nonzero_bits (XEXP (x, 0), mode); | |
4101 | if (nonzero == 1) | |
4102 | return bitwidth; | |
4103 | ||
4104 | if (num0 > 1 | |
4105 | && (((HOST_WIDE_INT) 1 << (bitwidth - 1)) & nonzero)) | |
4106 | num0--; | |
4107 | ||
4108 | return num0; | |
4109 | ||
4110 | case IOR: case AND: case XOR: | |
4111 | case SMIN: case SMAX: case UMIN: case UMAX: | |
4112 | /* Logical operations will preserve the number of sign-bit copies. | |
4113 | MIN and MAX operations always return one of the operands. */ | |
4114 | num0 = cached_num_sign_bit_copies (XEXP (x, 0), mode, | |
4115 | known_x, known_mode, known_ret); | |
4116 | num1 = cached_num_sign_bit_copies (XEXP (x, 1), mode, | |
4117 | known_x, known_mode, known_ret); | |
4118 | return MIN (num0, num1); | |
4119 | ||
4120 | case PLUS: case MINUS: | |
4121 | /* For addition and subtraction, we can have a 1-bit carry. However, | |
4122 | if we are subtracting 1 from a positive number, there will not | |
4123 | be such a carry. Furthermore, if the positive number is known to | |
4124 | be 0 or 1, we know the result is either -1 or 0. */ | |
4125 | ||
4126 | if (code == PLUS && XEXP (x, 1) == constm1_rtx | |
4127 | && bitwidth <= HOST_BITS_PER_WIDE_INT) | |
4128 | { | |
4129 | nonzero = nonzero_bits (XEXP (x, 0), mode); | |
4130 | if ((((HOST_WIDE_INT) 1 << (bitwidth - 1)) & nonzero) == 0) | |
4131 | return (nonzero == 1 || nonzero == 0 ? bitwidth | |
4132 | : bitwidth - floor_log2 (nonzero) - 1); | |
4133 | } | |
4134 | ||
4135 | num0 = cached_num_sign_bit_copies (XEXP (x, 0), mode, | |
4136 | known_x, known_mode, known_ret); | |
4137 | num1 = cached_num_sign_bit_copies (XEXP (x, 1), mode, | |
4138 | known_x, known_mode, known_ret); | |
4139 | result = MAX (1, MIN (num0, num1) - 1); | |
4140 | ||
4141 | #ifdef POINTERS_EXTEND_UNSIGNED | |
4142 | /* If pointers extend signed and this is an addition or subtraction | |
4143 | to a pointer in Pmode, all the bits above ptr_mode are known to be | |
4144 | sign bit copies. */ | |
4145 | if (! POINTERS_EXTEND_UNSIGNED && GET_MODE (x) == Pmode | |
4146 | && (code == PLUS || code == MINUS) | |
f8cfc6aa | 4147 | && REG_P (XEXP (x, 0)) && REG_POINTER (XEXP (x, 0))) |
2f93eea8 PB |
4148 | result = MAX ((int) (GET_MODE_BITSIZE (Pmode) |
4149 | - GET_MODE_BITSIZE (ptr_mode) + 1), | |
4150 | result); | |
4151 | #endif | |
4152 | return result; | |
4153 | ||
4154 | case MULT: | |
4155 | /* The number of bits of the product is the sum of the number of | |
4156 | bits of both terms. However, unless one of the terms if known | |
4157 | to be positive, we must allow for an additional bit since negating | |
4158 | a negative number can remove one sign bit copy. */ | |
4159 | ||
4160 | num0 = cached_num_sign_bit_copies (XEXP (x, 0), mode, | |
4161 | known_x, known_mode, known_ret); | |
4162 | num1 = cached_num_sign_bit_copies (XEXP (x, 1), mode, | |
4163 | known_x, known_mode, known_ret); | |
4164 | ||
4165 | result = bitwidth - (bitwidth - num0) - (bitwidth - num1); | |
4166 | if (result > 0 | |
4167 | && (bitwidth > HOST_BITS_PER_WIDE_INT | |
4168 | || (((nonzero_bits (XEXP (x, 0), mode) | |
4169 | & ((HOST_WIDE_INT) 1 << (bitwidth - 1))) != 0) | |
4170 | && ((nonzero_bits (XEXP (x, 1), mode) | |
4171 | & ((HOST_WIDE_INT) 1 << (bitwidth - 1))) != 0)))) | |
4172 | result--; | |
4173 | ||
4174 | return MAX (1, result); | |
4175 | ||
4176 | case UDIV: | |
4177 | /* The result must be <= the first operand. If the first operand | |
4178 | has the high bit set, we know nothing about the number of sign | |
4179 | bit copies. */ | |
4180 | if (bitwidth > HOST_BITS_PER_WIDE_INT) | |
4181 | return 1; | |
4182 | else if ((nonzero_bits (XEXP (x, 0), mode) | |
4183 | & ((HOST_WIDE_INT) 1 << (bitwidth - 1))) != 0) | |
4184 | return 1; | |
4185 | else | |
4186 | return cached_num_sign_bit_copies (XEXP (x, 0), mode, | |
4187 | known_x, known_mode, known_ret); | |
4188 | ||
4189 | case UMOD: | |
4190 | /* The result must be <= the second operand. */ | |
4191 | return cached_num_sign_bit_copies (XEXP (x, 1), mode, | |
4192 | known_x, known_mode, known_ret); | |
4193 | ||
4194 | case DIV: | |
4195 | /* Similar to unsigned division, except that we have to worry about | |
4196 | the case where the divisor is negative, in which case we have | |
4197 | to add 1. */ | |
4198 | result = cached_num_sign_bit_copies (XEXP (x, 0), mode, | |
4199 | known_x, known_mode, known_ret); | |
4200 | if (result > 1 | |
4201 | && (bitwidth > HOST_BITS_PER_WIDE_INT | |
4202 | || (nonzero_bits (XEXP (x, 1), mode) | |
4203 | & ((HOST_WIDE_INT) 1 << (bitwidth - 1))) != 0)) | |
4204 | result--; | |
4205 | ||
4206 | return result; | |
4207 | ||
4208 | case MOD: | |
4209 | result = cached_num_sign_bit_copies (XEXP (x, 1), mode, | |
4210 | known_x, known_mode, known_ret); | |
4211 | if (result > 1 | |
4212 | && (bitwidth > HOST_BITS_PER_WIDE_INT | |
4213 | || (nonzero_bits (XEXP (x, 1), mode) | |
4214 | & ((HOST_WIDE_INT) 1 << (bitwidth - 1))) != 0)) | |
4215 | result--; | |
4216 | ||
4217 | return result; | |
4218 | ||
4219 | case ASHIFTRT: | |
4220 | /* Shifts by a constant add to the number of bits equal to the | |
4221 | sign bit. */ | |
4222 | num0 = cached_num_sign_bit_copies (XEXP (x, 0), mode, | |
4223 | known_x, known_mode, known_ret); | |
4224 | if (GET_CODE (XEXP (x, 1)) == CONST_INT | |
4225 | && INTVAL (XEXP (x, 1)) > 0) | |
4226 | num0 = MIN ((int) bitwidth, num0 + INTVAL (XEXP (x, 1))); | |
4227 | ||
4228 | return num0; | |
4229 | ||
4230 | case ASHIFT: | |
4231 | /* Left shifts destroy copies. */ | |
4232 | if (GET_CODE (XEXP (x, 1)) != CONST_INT | |
4233 | || INTVAL (XEXP (x, 1)) < 0 | |
4234 | || INTVAL (XEXP (x, 1)) >= (int) bitwidth) | |
4235 | return 1; | |
4236 | ||
4237 | num0 = cached_num_sign_bit_copies (XEXP (x, 0), mode, | |
4238 | known_x, known_mode, known_ret); | |
4239 | return MAX (1, num0 - INTVAL (XEXP (x, 1))); | |
4240 | ||
4241 | case IF_THEN_ELSE: | |
4242 | num0 = cached_num_sign_bit_copies (XEXP (x, 1), mode, | |
4243 | known_x, known_mode, known_ret); | |
4244 | num1 = cached_num_sign_bit_copies (XEXP (x, 2), mode, | |
4245 | known_x, known_mode, known_ret); | |
4246 | return MIN (num0, num1); | |
4247 | ||
4248 | case EQ: case NE: case GE: case GT: case LE: case LT: | |
4249 | case UNEQ: case LTGT: case UNGE: case UNGT: case UNLE: case UNLT: | |
4250 | case GEU: case GTU: case LEU: case LTU: | |
4251 | case UNORDERED: case ORDERED: | |
4252 | /* If the constant is negative, take its 1's complement and remask. | |
4253 | Then see how many zero bits we have. */ | |
4254 | nonzero = STORE_FLAG_VALUE; | |
4255 | if (bitwidth <= HOST_BITS_PER_WIDE_INT | |
4256 | && (nonzero & ((HOST_WIDE_INT) 1 << (bitwidth - 1))) != 0) | |
4257 | nonzero = (~nonzero) & GET_MODE_MASK (mode); | |
4258 | ||
4259 | return (nonzero == 0 ? bitwidth : bitwidth - floor_log2 (nonzero) - 1); | |
4260 | ||
4261 | default: | |
4262 | break; | |
4263 | } | |
4264 | ||
4265 | /* If we haven't been able to figure it out by one of the above rules, | |
4266 | see if some of the high-order bits are known to be zero. If so, | |
4267 | count those bits and return one less than that amount. If we can't | |
4268 | safely compute the mask for this mode, always return BITWIDTH. */ | |
4269 | ||
4270 | bitwidth = GET_MODE_BITSIZE (mode); | |
4271 | if (bitwidth > HOST_BITS_PER_WIDE_INT) | |
4272 | return 1; | |
4273 | ||
4274 | nonzero = nonzero_bits (x, mode); | |
4275 | return nonzero & ((HOST_WIDE_INT) 1 << (bitwidth - 1)) | |
4276 | ? 1 : bitwidth - floor_log2 (nonzero) - 1; | |
4277 | } | |
6fd21094 RS |
4278 | |
4279 | /* Calculate the rtx_cost of a single instruction. A return value of | |
4280 | zero indicates an instruction pattern without a known cost. */ | |
4281 | ||
4282 | int | |
4283 | insn_rtx_cost (rtx pat) | |
4284 | { | |
4285 | int i, cost; | |
4286 | rtx set; | |
4287 | ||
4288 | /* Extract the single set rtx from the instruction pattern. | |
4289 | We can't use single_set since we only have the pattern. */ | |
4290 | if (GET_CODE (pat) == SET) | |
4291 | set = pat; | |
4292 | else if (GET_CODE (pat) == PARALLEL) | |
4293 | { | |
4294 | set = NULL_RTX; | |
4295 | for (i = 0; i < XVECLEN (pat, 0); i++) | |
4296 | { | |
4297 | rtx x = XVECEXP (pat, 0, i); | |
4298 | if (GET_CODE (x) == SET) | |
4299 | { | |
4300 | if (set) | |
4301 | return 0; | |
4302 | set = x; | |
4303 | } | |
4304 | } | |
4305 | if (!set) | |
4306 | return 0; | |
4307 | } | |
4308 | else | |
4309 | return 0; | |
4310 | ||
4311 | cost = rtx_cost (SET_SRC (set), SET); | |
4312 | return cost > 0 ? cost : COSTS_N_INSNS (1); | |
4313 | } | |
75473b02 SB |
4314 | |
4315 | /* Given an insn INSN and condition COND, return the condition in a | |
4316 | canonical form to simplify testing by callers. Specifically: | |
4317 | ||
4318 | (1) The code will always be a comparison operation (EQ, NE, GT, etc.). | |
4319 | (2) Both operands will be machine operands; (cc0) will have been replaced. | |
4320 | (3) If an operand is a constant, it will be the second operand. | |
4321 | (4) (LE x const) will be replaced with (LT x <const+1>) and similarly | |
4322 | for GE, GEU, and LEU. | |
4323 | ||
4324 | If the condition cannot be understood, or is an inequality floating-point | |
4325 | comparison which needs to be reversed, 0 will be returned. | |
4326 | ||
4327 | If REVERSE is nonzero, then reverse the condition prior to canonizing it. | |
4328 | ||
4329 | If EARLIEST is nonzero, it is a pointer to a place where the earliest | |
4330 | insn used in locating the condition was found. If a replacement test | |
4331 | of the condition is desired, it should be placed in front of that | |
4332 | insn and we will be sure that the inputs are still valid. | |
4333 | ||
4334 | If WANT_REG is nonzero, we wish the condition to be relative to that | |
4335 | register, if possible. Therefore, do not canonicalize the condition | |
4336 | further. If ALLOW_CC_MODE is nonzero, allow the condition returned | |
4337 | to be a compare to a CC mode register. | |
4338 | ||
4339 | If VALID_AT_INSN_P, the condition must be valid at both *EARLIEST | |
4340 | and at INSN. */ | |
4341 | ||
4342 | rtx | |
4343 | canonicalize_condition (rtx insn, rtx cond, int reverse, rtx *earliest, | |
4344 | rtx want_reg, int allow_cc_mode, int valid_at_insn_p) | |
4345 | { | |
4346 | enum rtx_code code; | |
4347 | rtx prev = insn; | |
4348 | rtx set; | |
4349 | rtx tem; | |
4350 | rtx op0, op1; | |
4351 | int reverse_code = 0; | |
4352 | enum machine_mode mode; | |
569f8d98 | 4353 | basic_block bb = BLOCK_FOR_INSN (insn); |
75473b02 SB |
4354 | |
4355 | code = GET_CODE (cond); | |
4356 | mode = GET_MODE (cond); | |
4357 | op0 = XEXP (cond, 0); | |
4358 | op1 = XEXP (cond, 1); | |
4359 | ||
4360 | if (reverse) | |
4361 | code = reversed_comparison_code (cond, insn); | |
4362 | if (code == UNKNOWN) | |
4363 | return 0; | |
4364 | ||
4365 | if (earliest) | |
4366 | *earliest = insn; | |
4367 | ||
4368 | /* If we are comparing a register with zero, see if the register is set | |
4369 | in the previous insn to a COMPARE or a comparison operation. Perform | |
4370 | the same tests as a function of STORE_FLAG_VALUE as find_comparison_args | |
4371 | in cse.c */ | |
4372 | ||
4373 | while ((GET_RTX_CLASS (code) == RTX_COMPARE | |
4374 | || GET_RTX_CLASS (code) == RTX_COMM_COMPARE) | |
4375 | && op1 == CONST0_RTX (GET_MODE (op0)) | |
4376 | && op0 != want_reg) | |
4377 | { | |
4378 | /* Set nonzero when we find something of interest. */ | |
4379 | rtx x = 0; | |
4380 | ||
4381 | #ifdef HAVE_cc0 | |
4382 | /* If comparison with cc0, import actual comparison from compare | |
4383 | insn. */ | |
4384 | if (op0 == cc0_rtx) | |
4385 | { | |
4386 | if ((prev = prev_nonnote_insn (prev)) == 0 | |
4387 | || !NONJUMP_INSN_P (prev) | |
4388 | || (set = single_set (prev)) == 0 | |
4389 | || SET_DEST (set) != cc0_rtx) | |
4390 | return 0; | |
4391 | ||
4392 | op0 = SET_SRC (set); | |
4393 | op1 = CONST0_RTX (GET_MODE (op0)); | |
4394 | if (earliest) | |
4395 | *earliest = prev; | |
4396 | } | |
4397 | #endif | |
4398 | ||
4399 | /* If this is a COMPARE, pick up the two things being compared. */ | |
4400 | if (GET_CODE (op0) == COMPARE) | |
4401 | { | |
4402 | op1 = XEXP (op0, 1); | |
4403 | op0 = XEXP (op0, 0); | |
4404 | continue; | |
4405 | } | |
4406 | else if (!REG_P (op0)) | |
4407 | break; | |
4408 | ||
4409 | /* Go back to the previous insn. Stop if it is not an INSN. We also | |
4410 | stop if it isn't a single set or if it has a REG_INC note because | |
4411 | we don't want to bother dealing with it. */ | |
4412 | ||
4413 | if ((prev = prev_nonnote_insn (prev)) == 0 | |
4414 | || !NONJUMP_INSN_P (prev) | |
569f8d98 ZD |
4415 | || FIND_REG_INC_NOTE (prev, NULL_RTX) |
4416 | /* In cfglayout mode, there do not have to be labels at the | |
4417 | beginning of a block, or jumps at the end, so the previous | |
4418 | conditions would not stop us when we reach bb boundary. */ | |
4419 | || BLOCK_FOR_INSN (prev) != bb) | |
75473b02 SB |
4420 | break; |
4421 | ||
4422 | set = set_of (op0, prev); | |
4423 | ||
4424 | if (set | |
4425 | && (GET_CODE (set) != SET | |
4426 | || !rtx_equal_p (SET_DEST (set), op0))) | |
4427 | break; | |
4428 | ||
4429 | /* If this is setting OP0, get what it sets it to if it looks | |
4430 | relevant. */ | |
4431 | if (set) | |
4432 | { | |
4433 | enum machine_mode inner_mode = GET_MODE (SET_DEST (set)); | |
4434 | #ifdef FLOAT_STORE_FLAG_VALUE | |
4435 | REAL_VALUE_TYPE fsfv; | |
4436 | #endif | |
4437 | ||
4438 | /* ??? We may not combine comparisons done in a CCmode with | |
4439 | comparisons not done in a CCmode. This is to aid targets | |
4440 | like Alpha that have an IEEE compliant EQ instruction, and | |
4441 | a non-IEEE compliant BEQ instruction. The use of CCmode is | |
4442 | actually artificial, simply to prevent the combination, but | |
4443 | should not affect other platforms. | |
4444 | ||
4445 | However, we must allow VOIDmode comparisons to match either | |
4446 | CCmode or non-CCmode comparison, because some ports have | |
4447 | modeless comparisons inside branch patterns. | |
4448 | ||
4449 | ??? This mode check should perhaps look more like the mode check | |
4450 | in simplify_comparison in combine. */ | |
4451 | ||
4452 | if ((GET_CODE (SET_SRC (set)) == COMPARE | |
4453 | || (((code == NE | |
4454 | || (code == LT | |
4455 | && GET_MODE_CLASS (inner_mode) == MODE_INT | |
4456 | && (GET_MODE_BITSIZE (inner_mode) | |
4457 | <= HOST_BITS_PER_WIDE_INT) | |
4458 | && (STORE_FLAG_VALUE | |
4459 | & ((HOST_WIDE_INT) 1 | |
4460 | << (GET_MODE_BITSIZE (inner_mode) - 1)))) | |
4461 | #ifdef FLOAT_STORE_FLAG_VALUE | |
4462 | || (code == LT | |
3d8bf70f | 4463 | && SCALAR_FLOAT_MODE_P (inner_mode) |
75473b02 SB |
4464 | && (fsfv = FLOAT_STORE_FLAG_VALUE (inner_mode), |
4465 | REAL_VALUE_NEGATIVE (fsfv))) | |
4466 | #endif | |
4467 | )) | |
4468 | && COMPARISON_P (SET_SRC (set)))) | |
4469 | && (((GET_MODE_CLASS (mode) == MODE_CC) | |
4470 | == (GET_MODE_CLASS (inner_mode) == MODE_CC)) | |
4471 | || mode == VOIDmode || inner_mode == VOIDmode)) | |
4472 | x = SET_SRC (set); | |
4473 | else if (((code == EQ | |
4474 | || (code == GE | |
4475 | && (GET_MODE_BITSIZE (inner_mode) | |
4476 | <= HOST_BITS_PER_WIDE_INT) | |
4477 | && GET_MODE_CLASS (inner_mode) == MODE_INT | |
4478 | && (STORE_FLAG_VALUE | |
4479 | & ((HOST_WIDE_INT) 1 | |
4480 | << (GET_MODE_BITSIZE (inner_mode) - 1)))) | |
4481 | #ifdef FLOAT_STORE_FLAG_VALUE | |
4482 | || (code == GE | |
3d8bf70f | 4483 | && SCALAR_FLOAT_MODE_P (inner_mode) |
75473b02 SB |
4484 | && (fsfv = FLOAT_STORE_FLAG_VALUE (inner_mode), |
4485 | REAL_VALUE_NEGATIVE (fsfv))) | |
4486 | #endif | |
4487 | )) | |
4488 | && COMPARISON_P (SET_SRC (set)) | |
4489 | && (((GET_MODE_CLASS (mode) == MODE_CC) | |
4490 | == (GET_MODE_CLASS (inner_mode) == MODE_CC)) | |
4491 | || mode == VOIDmode || inner_mode == VOIDmode)) | |
4492 | ||
4493 | { | |
4494 | reverse_code = 1; | |
4495 | x = SET_SRC (set); | |
4496 | } | |
4497 | else | |
4498 | break; | |
4499 | } | |
4500 | ||
4501 | else if (reg_set_p (op0, prev)) | |
4502 | /* If this sets OP0, but not directly, we have to give up. */ | |
4503 | break; | |
4504 | ||
4505 | if (x) | |
4506 | { | |
4507 | /* If the caller is expecting the condition to be valid at INSN, | |
4508 | make sure X doesn't change before INSN. */ | |
4509 | if (valid_at_insn_p) | |
4510 | if (modified_in_p (x, prev) || modified_between_p (x, prev, insn)) | |
4511 | break; | |
4512 | if (COMPARISON_P (x)) | |
4513 | code = GET_CODE (x); | |
4514 | if (reverse_code) | |
4515 | { | |
4516 | code = reversed_comparison_code (x, prev); | |
4517 | if (code == UNKNOWN) | |
4518 | return 0; | |
4519 | reverse_code = 0; | |
4520 | } | |
4521 | ||
4522 | op0 = XEXP (x, 0), op1 = XEXP (x, 1); | |
4523 | if (earliest) | |
4524 | *earliest = prev; | |
4525 | } | |
4526 | } | |
4527 | ||
4528 | /* If constant is first, put it last. */ | |
4529 | if (CONSTANT_P (op0)) | |
4530 | code = swap_condition (code), tem = op0, op0 = op1, op1 = tem; | |
4531 | ||
4532 | /* If OP0 is the result of a comparison, we weren't able to find what | |
4533 | was really being compared, so fail. */ | |
4534 | if (!allow_cc_mode | |
4535 | && GET_MODE_CLASS (GET_MODE (op0)) == MODE_CC) | |
4536 | return 0; | |
4537 | ||
4538 | /* Canonicalize any ordered comparison with integers involving equality | |
4539 | if we can do computations in the relevant mode and we do not | |
4540 | overflow. */ | |
4541 | ||
4542 | if (GET_MODE_CLASS (GET_MODE (op0)) != MODE_CC | |
4543 | && GET_CODE (op1) == CONST_INT | |
4544 | && GET_MODE (op0) != VOIDmode | |
4545 | && GET_MODE_BITSIZE (GET_MODE (op0)) <= HOST_BITS_PER_WIDE_INT) | |
4546 | { | |
4547 | HOST_WIDE_INT const_val = INTVAL (op1); | |
4548 | unsigned HOST_WIDE_INT uconst_val = const_val; | |
4549 | unsigned HOST_WIDE_INT max_val | |
4550 | = (unsigned HOST_WIDE_INT) GET_MODE_MASK (GET_MODE (op0)); | |
4551 | ||
4552 | switch (code) | |
4553 | { | |
4554 | case LE: | |
4555 | if ((unsigned HOST_WIDE_INT) const_val != max_val >> 1) | |
4556 | code = LT, op1 = gen_int_mode (const_val + 1, GET_MODE (op0)); | |
4557 | break; | |
4558 | ||
4559 | /* When cross-compiling, const_val might be sign-extended from | |
4560 | BITS_PER_WORD to HOST_BITS_PER_WIDE_INT */ | |
4561 | case GE: | |
4562 | if ((HOST_WIDE_INT) (const_val & max_val) | |
4563 | != (((HOST_WIDE_INT) 1 | |
4564 | << (GET_MODE_BITSIZE (GET_MODE (op0)) - 1)))) | |
4565 | code = GT, op1 = gen_int_mode (const_val - 1, GET_MODE (op0)); | |
4566 | break; | |
4567 | ||
4568 | case LEU: | |
4569 | if (uconst_val < max_val) | |
4570 | code = LTU, op1 = gen_int_mode (uconst_val + 1, GET_MODE (op0)); | |
4571 | break; | |
4572 | ||
4573 | case GEU: | |
4574 | if (uconst_val != 0) | |
4575 | code = GTU, op1 = gen_int_mode (uconst_val - 1, GET_MODE (op0)); | |
4576 | break; | |
4577 | ||
4578 | default: | |
4579 | break; | |
4580 | } | |
4581 | } | |
4582 | ||
4583 | /* Never return CC0; return zero instead. */ | |
4584 | if (CC0_P (op0)) | |
4585 | return 0; | |
4586 | ||
4587 | return gen_rtx_fmt_ee (code, VOIDmode, op0, op1); | |
4588 | } | |
4589 | ||
4590 | /* Given a jump insn JUMP, return the condition that will cause it to branch | |
4591 | to its JUMP_LABEL. If the condition cannot be understood, or is an | |
4592 | inequality floating-point comparison which needs to be reversed, 0 will | |
4593 | be returned. | |
4594 | ||
4595 | If EARLIEST is nonzero, it is a pointer to a place where the earliest | |
4596 | insn used in locating the condition was found. If a replacement test | |
4597 | of the condition is desired, it should be placed in front of that | |
4598 | insn and we will be sure that the inputs are still valid. If EARLIEST | |
4599 | is null, the returned condition will be valid at INSN. | |
4600 | ||
4601 | If ALLOW_CC_MODE is nonzero, allow the condition returned to be a | |
4602 | compare CC mode register. | |
4603 | ||
4604 | VALID_AT_INSN_P is the same as for canonicalize_condition. */ | |
4605 | ||
4606 | rtx | |
4607 | get_condition (rtx jump, rtx *earliest, int allow_cc_mode, int valid_at_insn_p) | |
4608 | { | |
4609 | rtx cond; | |
4610 | int reverse; | |
4611 | rtx set; | |
4612 | ||
4613 | /* If this is not a standard conditional jump, we can't parse it. */ | |
4614 | if (!JUMP_P (jump) | |
4615 | || ! any_condjump_p (jump)) | |
4616 | return 0; | |
4617 | set = pc_set (jump); | |
4618 | ||
4619 | cond = XEXP (SET_SRC (set), 0); | |
4620 | ||
4621 | /* If this branches to JUMP_LABEL when the condition is false, reverse | |
4622 | the condition. */ | |
4623 | reverse | |
4624 | = GET_CODE (XEXP (SET_SRC (set), 2)) == LABEL_REF | |
4625 | && XEXP (XEXP (SET_SRC (set), 2), 0) == JUMP_LABEL (jump); | |
4626 | ||
4627 | return canonicalize_condition (jump, cond, reverse, earliest, NULL_RTX, | |
4628 | allow_cc_mode, valid_at_insn_p); | |
4629 | } | |
4630 | ||
b12cbf2c AN |
4631 | /* Initialize the table NUM_SIGN_BIT_COPIES_IN_REP based on |
4632 | TARGET_MODE_REP_EXTENDED. | |
4633 | ||
4634 | Note that we assume that the property of | |
4635 | TARGET_MODE_REP_EXTENDED(B, C) is sticky to the integral modes | |
4636 | narrower than mode B. I.e., if A is a mode narrower than B then in | |
4637 | order to be able to operate on it in mode B, mode A needs to | |
4638 | satisfy the requirements set by the representation of mode B. */ | |
4639 | ||
4640 | static void | |
4641 | init_num_sign_bit_copies_in_rep (void) | |
4642 | { | |
4643 | enum machine_mode mode, in_mode; | |
4644 | ||
4645 | for (in_mode = GET_CLASS_NARROWEST_MODE (MODE_INT); in_mode != VOIDmode; | |
4646 | in_mode = GET_MODE_WIDER_MODE (mode)) | |
4647 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != in_mode; | |
4648 | mode = GET_MODE_WIDER_MODE (mode)) | |
4649 | { | |
4650 | enum machine_mode i; | |
4651 | ||
4652 | /* Currently, it is assumed that TARGET_MODE_REP_EXTENDED | |
4653 | extends to the next widest mode. */ | |
4654 | gcc_assert (targetm.mode_rep_extended (mode, in_mode) == UNKNOWN | |
4655 | || GET_MODE_WIDER_MODE (mode) == in_mode); | |
4656 | ||
4657 | /* We are in in_mode. Count how many bits outside of mode | |
4658 | have to be copies of the sign-bit. */ | |
4659 | for (i = mode; i != in_mode; i = GET_MODE_WIDER_MODE (i)) | |
4660 | { | |
4661 | enum machine_mode wider = GET_MODE_WIDER_MODE (i); | |
4662 | ||
4663 | if (targetm.mode_rep_extended (i, wider) == SIGN_EXTEND | |
4664 | /* We can only check sign-bit copies starting from the | |
4665 | top-bit. In order to be able to check the bits we | |
4666 | have already seen we pretend that subsequent bits | |
4667 | have to be sign-bit copies too. */ | |
4668 | || num_sign_bit_copies_in_rep [in_mode][mode]) | |
4669 | num_sign_bit_copies_in_rep [in_mode][mode] | |
4670 | += GET_MODE_BITSIZE (wider) - GET_MODE_BITSIZE (i); | |
4671 | } | |
4672 | } | |
4673 | } | |
4674 | ||
d3b72690 PB |
4675 | /* Suppose that truncation from the machine mode of X to MODE is not a |
4676 | no-op. See if there is anything special about X so that we can | |
4677 | assume it already contains a truncated value of MODE. */ | |
4678 | ||
4679 | bool | |
4680 | truncated_to_mode (enum machine_mode mode, rtx x) | |
4681 | { | |
b12cbf2c AN |
4682 | /* This register has already been used in MODE without explicit |
4683 | truncation. */ | |
4684 | if (REG_P (x) && rtl_hooks.reg_truncated_to_mode (mode, x)) | |
4685 | return true; | |
4686 | ||
4687 | /* See if we already satisfy the requirements of MODE. If yes we | |
4688 | can just switch to MODE. */ | |
4689 | if (num_sign_bit_copies_in_rep[GET_MODE (x)][mode] | |
4690 | && (num_sign_bit_copies (x, GET_MODE (x)) | |
4691 | >= num_sign_bit_copies_in_rep[GET_MODE (x)][mode] + 1)) | |
4692 | return true; | |
d3b72690 | 4693 | |
b12cbf2c AN |
4694 | return false; |
4695 | } | |
cf94b0fc PB |
4696 | \f |
4697 | /* Initialize non_rtx_starting_operands, which is used to speed up | |
4698 | for_each_rtx. */ | |
4699 | void | |
4700 | init_rtlanal (void) | |
4701 | { | |
4702 | int i; | |
4703 | for (i = 0; i < NUM_RTX_CODE; i++) | |
4704 | { | |
4705 | const char *format = GET_RTX_FORMAT (i); | |
4706 | const char *first = strpbrk (format, "eEV"); | |
4707 | non_rtx_starting_operands[i] = first ? first - format : -1; | |
4708 | } | |
b12cbf2c AN |
4709 | |
4710 | init_num_sign_bit_copies_in_rep (); | |
cf94b0fc | 4711 | } |
3d8504ac RS |
4712 | \f |
4713 | /* Check whether this is a constant pool constant. */ | |
4714 | bool | |
4715 | constant_pool_constant_p (rtx x) | |
4716 | { | |
4717 | x = avoid_constant_pool_reference (x); | |
4718 | return GET_CODE (x) == CONST_DOUBLE; | |
4719 | } | |
4720 |