Line data Source code
1 : /* Register renaming for the GNU compiler.
2 : Copyright (C) 2000-2026 Free Software Foundation, Inc.
3 :
4 : This file is part of GCC.
5 :
6 : GCC is free software; you can redistribute it and/or modify it
7 : under the terms of the GNU General Public License as published by
8 : the Free Software Foundation; either version 3, or (at your option)
9 : any later version.
10 :
11 : GCC is distributed in the hope that it will be useful, but WITHOUT
12 : ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 : or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
14 : License for more details.
15 :
16 : You should have received a copy of the GNU General Public License
17 : along with GCC; see the file COPYING3. If not see
18 : <http://www.gnu.org/licenses/>. */
19 :
20 : #include "config.h"
21 : #include "system.h"
22 : #include "coretypes.h"
23 : #include "backend.h"
24 : #include "target.h"
25 : #include "rtl.h"
26 : #include "df.h"
27 : #include "memmodel.h"
28 : #include "tm_p.h"
29 : #include "insn-config.h"
30 : #include "regs.h"
31 : #include "emit-rtl.h"
32 : #include "recog.h"
33 : #include "addresses.h"
34 : #include "cfganal.h"
35 : #include "tree-pass.h"
36 : #include "function-abi.h"
37 : #include "regrename.h"
38 :
39 : /* This file implements the RTL register renaming pass of the compiler. It is
40 : a semi-local pass whose goal is to maximize the usage of the register file
41 : of the processor by substituting registers for others in the solution given
42 : by the register allocator. The algorithm is as follows:
43 :
44 : 1. Local def/use chains are built: within each basic block, chains are
45 : opened and closed; if a chain isn't closed at the end of the block,
46 : it is dropped. We pre-open chains if we have already examined a
47 : predecessor block and found chains live at the end which match
48 : live registers at the start of the new block.
49 :
50 : 2. We try to combine the local chains across basic block boundaries by
51 : comparing chains that were open at the start or end of a block to
52 : those in successor/predecessor blocks.
53 :
54 : 3. For each chain, the set of possible renaming registers is computed.
55 : This takes into account the renaming of previously processed chains.
56 : Optionally, a preferred class is computed for the renaming register.
57 :
58 : 4. The best renaming register is computed for the chain in the above set,
59 : using a round-robin allocation. If a preferred class exists, then the
60 : round-robin allocation is done within the class first, if possible.
61 : The round-robin allocation of renaming registers itself is global.
62 :
63 : 5. If a renaming register has been found, it is substituted in the chain.
64 :
65 : Targets can parameterize the pass by specifying a preferred class for the
66 : renaming register for a given (super)class of registers to be renamed.
67 :
68 : DEBUG_INSNs are treated specially, in particular registers occurring inside
69 : them are treated as requiring ALL_REGS as a class. */
70 :
71 : #if HOST_BITS_PER_WIDE_INT <= MAX_RECOG_OPERANDS
72 : #error "Use a different bitmap implementation for untracked_operands."
73 : #endif
74 :
75 : enum scan_actions
76 : {
77 : terminate_write,
78 : terminate_dead,
79 : mark_all_read,
80 : mark_read,
81 : mark_write,
82 : /* mark_access is for marking the destination regs in
83 : REG_FRAME_RELATED_EXPR notes (as if they were read) so that the
84 : note is updated properly. */
85 : mark_access
86 : };
87 :
88 : static const char * const scan_actions_name[] =
89 : {
90 : "terminate_write",
91 : "terminate_dead",
92 : "mark_all_read",
93 : "mark_read",
94 : "mark_write",
95 : "mark_access"
96 : };
97 :
98 : /* TICK and THIS_TICK are used to record the last time we saw each
99 : register. */
100 : static int tick[FIRST_PSEUDO_REGISTER];
101 : static int this_tick = 0;
102 :
103 : static struct obstack rename_obstack;
104 :
105 : /* If nonnull, the code calling into the register renamer requested
106 : information about insn operands, and we store it here. */
107 : vec<insn_rr_info> insn_rr;
108 :
109 : static void scan_rtx (rtx_insn *, rtx *, enum reg_class, enum scan_actions,
110 : enum op_type);
111 : static bool build_def_use (basic_block);
112 :
113 : /* The id to be given to the next opened chain. */
114 : static unsigned current_id;
115 :
116 : /* A mapping of unique id numbers to chains. */
117 : static vec<du_head_p> id_to_chain;
118 :
119 : /* List of currently open chains. */
120 : static class du_head *open_chains;
121 :
122 : /* Bitmap of open chains. The bits set always match the list found in
123 : open_chains. */
124 : static bitmap_head open_chains_set;
125 :
126 : /* Record the registers being tracked in open_chains. */
127 : static HARD_REG_SET live_in_chains;
128 :
129 : /* Record the registers that are live but not tracked. The intersection
130 : between this and live_in_chains is empty. */
131 : static HARD_REG_SET live_hard_regs;
132 :
133 : /* Set while scanning RTL if INSN_RR is nonnull, i.e. if the current analysis
134 : is for a caller that requires operand data. Used in
135 : record_operand_use. */
136 : static operand_rr_info *cur_operand;
137 :
138 : /* Set while scanning RTL if a register dies. Used to tie chains. */
139 : static class du_head *terminated_this_insn;
140 :
141 : /* Return the chain corresponding to id number ID. Take into account that
142 : chains may have been merged. */
143 : du_head_p
144 103355203 : regrename_chain_from_id (unsigned int id)
145 : {
146 103355203 : du_head_p first_chain = id_to_chain[id];
147 103355203 : du_head_p chain = first_chain;
148 164141809 : while (chain->id != id)
149 : {
150 60786606 : id = chain->id;
151 60786606 : chain = id_to_chain[id];
152 : }
153 103355203 : first_chain->id = id;
154 103355203 : return chain;
155 : }
156 :
157 : /* Dump all def/use chains, starting at id FROM. */
158 :
159 : static void
160 100 : dump_def_use_chain (int from)
161 : {
162 100 : du_head_p head;
163 100 : int i;
164 964 : FOR_EACH_VEC_ELT_FROM (id_to_chain, i, head, from)
165 : {
166 864 : struct du_chain *this_du = head->first;
167 :
168 864 : fprintf (dump_file, "Register %s (%d):",
169 864 : reg_names[head->regno], head->nregs);
170 2590 : while (this_du)
171 : {
172 862 : fprintf (dump_file, " %d [%s]", INSN_UID (this_du->insn),
173 862 : reg_class_names[this_du->cl]);
174 862 : this_du = this_du->next_use;
175 : }
176 864 : fprintf (dump_file, "\n");
177 864 : head = head->next_chain;
178 : }
179 100 : }
180 :
181 : static void
182 22497 : free_chain_data (void)
183 : {
184 22497 : int i;
185 22497 : du_head_p ptr;
186 4699010 : for (i = 0; id_to_chain.iterate (i, &ptr); i++)
187 4676513 : bitmap_clear (&ptr->conflicts);
188 :
189 22497 : id_to_chain.release ();
190 22497 : }
191 :
192 : /* Walk all chains starting with CHAINS and record that they conflict with
193 : another chain whose id is ID. */
194 :
195 : static void
196 4676513 : mark_conflict (class du_head *chains, unsigned id)
197 : {
198 28816662 : while (chains)
199 : {
200 24140149 : bitmap_set_bit (&chains->conflicts, id);
201 24140149 : chains = chains->next_chain;
202 : }
203 0 : }
204 :
205 : /* Examine cur_operand, and if it is nonnull, record information about the
206 : use THIS_DU which is part of the chain HEAD. */
207 :
208 : static void
209 5246309 : record_operand_use (class du_head *head, struct du_chain *this_du)
210 : {
211 5246309 : if (cur_operand == NULL || cur_operand->failed)
212 : return;
213 0 : if (head->cannot_rename)
214 : {
215 0 : cur_operand->failed = true;
216 0 : return;
217 : }
218 0 : gcc_assert (cur_operand->n_chains < MAX_REGS_PER_ADDRESS);
219 0 : cur_operand->heads[cur_operand->n_chains] = head;
220 0 : cur_operand->chains[cur_operand->n_chains++] = this_du;
221 : }
222 :
223 : /* Create a new chain for THIS_NREGS registers starting at THIS_REGNO,
224 : and record its occurrence in *LOC, which is being written to in INSN.
225 : This access requires a register of class CL. */
226 :
227 : static du_head_p
228 4676513 : create_new_chain (unsigned this_regno, unsigned this_nregs, rtx *loc,
229 : rtx_insn *insn, enum reg_class cl)
230 : {
231 4676513 : class du_head *head = XOBNEW (&rename_obstack, class du_head);
232 4676513 : struct du_chain *this_du;
233 4676513 : int nregs;
234 :
235 4676513 : memset ((void *)head, 0, sizeof *head);
236 4676513 : head->next_chain = open_chains;
237 4676513 : head->regno = this_regno;
238 4676513 : head->nregs = this_nregs;
239 :
240 4676513 : id_to_chain.safe_push (head);
241 4676513 : head->id = current_id++;
242 :
243 4676513 : bitmap_initialize (&head->conflicts, &bitmap_default_obstack);
244 4676513 : bitmap_copy (&head->conflicts, &open_chains_set);
245 4676513 : mark_conflict (open_chains, head->id);
246 :
247 : /* Since we're tracking this as a chain now, remove it from the
248 : list of conflicting live hard registers and track it in
249 : live_in_chains instead. */
250 4676513 : nregs = head->nregs;
251 9354668 : while (nregs-- > 0)
252 : {
253 4678155 : SET_HARD_REG_BIT (live_in_chains, head->regno + nregs);
254 4678155 : CLEAR_HARD_REG_BIT (live_hard_regs, head->regno + nregs);
255 : }
256 :
257 4676513 : head->hard_conflicts = live_hard_regs;
258 4676513 : bitmap_set_bit (&open_chains_set, head->id);
259 :
260 4676513 : open_chains = head;
261 :
262 4676513 : if (dump_file)
263 : {
264 864 : fprintf (dump_file, "Creating chain %s (%d)",
265 864 : reg_names[head->regno], head->id);
266 864 : if (insn != NULL_RTX)
267 136 : fprintf (dump_file, " at insn %d", INSN_UID (insn));
268 864 : fprintf (dump_file, "\n");
269 : }
270 :
271 4676513 : if (insn == NULL_RTX)
272 : {
273 3225537 : head->first = head->last = NULL;
274 3225537 : return head;
275 : }
276 :
277 1450976 : this_du = XOBNEW (&rename_obstack, struct du_chain);
278 1450976 : head->first = head->last = this_du;
279 :
280 1450976 : this_du->next_use = 0;
281 1450976 : this_du->loc = loc;
282 1450976 : this_du->insn = insn;
283 1450976 : this_du->cl = cl;
284 1450976 : record_operand_use (head, this_du);
285 1450976 : return head;
286 : }
287 :
288 : /* For a def-use chain HEAD, find which registers overlap its lifetime and
289 : set the corresponding bits in *PSET. */
290 :
291 : static void
292 988673 : merge_overlapping_regs (HARD_REG_SET *pset, class du_head *head)
293 : {
294 988673 : bitmap_iterator bi;
295 988673 : unsigned i;
296 988673 : *pset |= head->hard_conflicts;
297 46138641 : EXECUTE_IF_SET_IN_BITMAP (&head->conflicts, 0, i, bi)
298 : {
299 45149968 : du_head_p other = regrename_chain_from_id (i);
300 45149968 : unsigned j = other->nregs;
301 45149968 : gcc_assert (other != head);
302 90313385 : while (j-- > 0)
303 45163417 : SET_HARD_REG_BIT (*pset, other->regno + j);
304 : }
305 988673 : }
306 :
307 : /* Return true if (reg:MODE REGNO) would be clobbered by a call covered
308 : by THIS_HEAD. */
309 :
310 : static bool
311 21141199 : call_clobbered_in_chain_p (du_head *this_head, machine_mode mode,
312 : unsigned int regno)
313 : {
314 21141199 : return call_clobbered_in_region_p (this_head->call_abis,
315 0 : this_head->call_clobber_mask,
316 0 : mode, regno);
317 : }
318 :
319 : /* Check if NEW_REG can be the candidate register to rename for
320 : REG in THIS_HEAD chain. THIS_UNAVAILABLE is a set of unavailable hard
321 : registers. */
322 :
323 : static bool
324 89156776 : check_new_reg_p (int reg ATTRIBUTE_UNUSED, int new_reg,
325 : class du_head *this_head, HARD_REG_SET this_unavailable)
326 : {
327 89156776 : int nregs = 1;
328 89156776 : int i;
329 89156776 : struct du_chain *tmp;
330 :
331 : /* See whether new_reg accepts all modes that occur in
332 : definition and uses and record the number of regs it would take. */
333 321367798 : for (tmp = this_head->first; tmp; tmp = tmp->next_use)
334 : {
335 275768346 : int n;
336 : /* Completely ignore DEBUG_INSNs, otherwise we can get
337 : -fcompare-debug failures. */
338 275768346 : if (DEBUG_INSN_P (tmp->insn))
339 4202506 : continue;
340 :
341 271565840 : if (!targetm.hard_regno_mode_ok (new_reg, GET_MODE (*tmp->loc)))
342 : return false;
343 228008516 : n = hard_regno_nregs (new_reg, GET_MODE (*tmp->loc));
344 228008516 : if (n > nregs)
345 232211022 : nregs = n;
346 : }
347 :
348 51343526 : for (i = nregs - 1; i >= 0; --i)
349 45605317 : if (TEST_HARD_REG_BIT (this_unavailable, new_reg + i)
350 17406712 : || fixed_regs[new_reg + i]
351 6555038 : || global_regs[new_reg + i]
352 : /* Can't use regs which aren't saved by the prologue. */
353 6555038 : || (! df_regs_ever_live_p (new_reg + i)
354 1276649 : && ! crtl->abi->clobbers_full_reg_p (new_reg + i))
355 : #ifdef LEAF_REGISTERS
356 : /* We can't use a non-leaf register if we're in a
357 : leaf function. */
358 : || (crtl->is_leaf
359 : && !LEAF_REGISTERS[new_reg + i])
360 : #endif
361 51551635 : || ! HARD_REGNO_RENAME_OK (reg + i, new_reg + i))
362 39861243 : return false;
363 :
364 : /* See whether it accepts all modes that occur in
365 : definition and uses. */
366 27020189 : for (tmp = this_head->first; tmp; tmp = tmp->next_use)
367 : {
368 21281980 : if (DEBUG_INSN_P (tmp->insn))
369 140781 : continue;
370 :
371 21141199 : if (call_clobbered_in_chain_p (this_head, GET_MODE (*tmp->loc), new_reg))
372 : return false;
373 : }
374 :
375 : return true;
376 : }
377 :
378 : /* For the chain THIS_HEAD, compute and return the best register to
379 : rename to. SUPER_CLASS is the superunion of register classes in
380 : the chain. UNAVAILABLE is a set of registers that cannot be used.
381 : OLD_REG is the register currently used for the chain. BEST_RENAME
382 : controls whether the register chosen must be better than the
383 : current one or just respect the given constraint. */
384 :
385 : int
386 988673 : find_rename_reg (du_head_p this_head, enum reg_class super_class,
387 : HARD_REG_SET *unavailable, int old_reg, bool best_rename)
388 : {
389 988673 : bool has_preferred_class;
390 988673 : enum reg_class preferred_class;
391 988673 : int pass;
392 988673 : int best_new_reg = old_reg;
393 :
394 : /* Mark registers that overlap this chain's lifetime as unavailable. */
395 988673 : merge_overlapping_regs (unavailable, this_head);
396 :
397 : /* Compute preferred rename class of super union of all the classes
398 : in the chain. */
399 988673 : preferred_class
400 988673 : = (enum reg_class) targetm.preferred_rename_class (super_class);
401 :
402 : /* Pick and check the register from the tied chain iff the tied chain
403 : is not renamed. */
404 64530 : if (this_head->tied_chain && !this_head->tied_chain->renamed
405 1041701 : && check_new_reg_p (old_reg, this_head->tied_chain->regno,
406 : this_head, *unavailable))
407 13374 : return this_head->tied_chain->regno;
408 :
409 : /* If the first non-debug insn is a noop move, then do not rename in this
410 : chain as doing so would inhibit removal of the noop move. */
411 975322 : for (struct du_chain *tmp = this_head->first; tmp; tmp = tmp->next_use)
412 975322 : if (DEBUG_INSN_P (tmp->insn))
413 23 : continue;
414 975299 : else if (noop_move_p (tmp->insn))
415 : return best_new_reg;
416 : else
417 : break;
418 :
419 : /* If PREFERRED_CLASS is not NO_REGS, we iterate in the first pass
420 : over registers that belong to PREFERRED_CLASS and try to find the
421 : best register within the class. If that failed, we iterate in
422 : the second pass over registers that don't belong to the class.
423 : If PREFERRED_CLASS is NO_REGS, we iterate over all registers in
424 : ascending order without any preference. */
425 968519 : has_preferred_class = (preferred_class != NO_REGS);
426 2905557 : for (pass = (has_preferred_class ? 0 : 1); pass < 2; pass++)
427 : {
428 : int new_reg;
429 90072267 : for (new_reg = 0; new_reg < FIRST_PSEUDO_REGISTER; new_reg++)
430 : {
431 89103748 : if (has_preferred_class
432 89103748 : && (pass == 0)
433 0 : != TEST_HARD_REG_BIT (reg_class_contents[preferred_class],
434 : new_reg))
435 0 : continue;
436 :
437 89103748 : if (!check_new_reg_p (old_reg, new_reg, this_head, *unavailable))
438 83378913 : continue;
439 :
440 5724835 : if (!best_rename)
441 : return new_reg;
442 :
443 : /* In the first pass, we force the renaming of registers that
444 : don't belong to PREFERRED_CLASS to registers that do, even
445 : though the latters were used not very long ago. */
446 5724835 : if ((pass == 0
447 0 : && !TEST_HARD_REG_BIT (reg_class_contents[preferred_class],
448 : best_new_reg))
449 5724835 : || tick[best_new_reg] > tick[new_reg])
450 : best_new_reg = new_reg;
451 : }
452 968519 : if (pass == 0 && best_new_reg != old_reg)
453 : break;
454 : }
455 : return best_new_reg;
456 : }
457 :
458 : /* Iterate over elements in the chain HEAD in order to:
459 : 1. Count number of uses, storing it in *PN_USES.
460 : 2. Narrow the set of registers we can use for renaming, adding
461 : unavailable registers to *PUNAVAILABLE, which must be
462 : initialized by the caller.
463 : 3. Compute the superunion of register classes in this chain
464 : and return it. */
465 : reg_class
466 4243798 : regrename_find_superclass (du_head_p head, int *pn_uses,
467 : HARD_REG_SET *punavailable)
468 : {
469 4243798 : int n_uses = 0;
470 4243798 : reg_class super_class = NO_REGS;
471 8911392 : for (du_chain *tmp = head->first; tmp; tmp = tmp->next_use)
472 : {
473 4667594 : if (DEBUG_INSN_P (tmp->insn))
474 72889 : continue;
475 4594705 : n_uses++;
476 4594705 : *punavailable |= ~reg_class_contents[tmp->cl];
477 4594705 : super_class
478 4594705 : = reg_class_superunion[(int) super_class][(int) tmp->cl];
479 : }
480 4243798 : *pn_uses = n_uses;
481 4243798 : return super_class;
482 : }
483 :
484 : /* Perform register renaming on the current function. */
485 : static void
486 22497 : rename_chains (void)
487 : {
488 22497 : HARD_REG_SET unavailable;
489 22497 : du_head_p this_head;
490 22497 : int i;
491 :
492 22497 : memset (tick, 0, sizeof tick);
493 :
494 22497 : CLEAR_HARD_REG_SET (unavailable);
495 : /* Don't clobber traceback for noreturn functions. */
496 22497 : if (frame_pointer_needed)
497 : {
498 784 : add_to_hard_reg_set (&unavailable, Pmode, FRAME_POINTER_REGNUM);
499 743 : if (!HARD_FRAME_POINTER_IS_FRAME_POINTER)
500 743 : add_to_hard_reg_set (&unavailable, Pmode, HARD_FRAME_POINTER_REGNUM);
501 : }
502 :
503 4699010 : FOR_EACH_VEC_ELT (id_to_chain, i, this_head)
504 : {
505 4676513 : int best_new_reg;
506 4676513 : int n_uses;
507 4676513 : HARD_REG_SET this_unavailable;
508 4676513 : int reg = this_head->regno;
509 :
510 4676513 : if (this_head->cannot_rename)
511 4155627 : continue;
512 :
513 4323132 : if (fixed_regs[reg] || global_regs[reg]
514 4322028 : || (!HARD_FRAME_POINTER_IS_FRAME_POINTER && frame_pointer_needed
515 927488 : && reg == HARD_FRAME_POINTER_REGNUM)
516 : || (HARD_FRAME_POINTER_IS_FRAME_POINTER && frame_pointer_needed
517 : && reg == FRAME_POINTER_REGNUM))
518 79334 : continue;
519 :
520 4243798 : this_unavailable = unavailable;
521 :
522 4243798 : reg_class super_class = regrename_find_superclass (this_head, &n_uses,
523 : &this_unavailable);
524 4243798 : if (n_uses < 2)
525 3255125 : continue;
526 :
527 988673 : best_new_reg = find_rename_reg (this_head, super_class,
528 : &this_unavailable, reg, true);
529 :
530 988673 : if (dump_file)
531 : {
532 110 : fprintf (dump_file, "Register %s in insn %d",
533 110 : reg_names[reg], INSN_UID (this_head->first->insn));
534 110 : if (this_head->call_abis)
535 4 : fprintf (dump_file, " crosses a call");
536 : }
537 :
538 988673 : if (best_new_reg == reg)
539 : {
540 467787 : tick[reg] = ++this_tick;
541 467787 : if (dump_file)
542 50 : fprintf (dump_file, "; no available better choice\n");
543 467787 : continue;
544 : }
545 :
546 520886 : if (regrename_do_replace (this_head, best_new_reg))
547 : {
548 520822 : if (dump_file)
549 60 : fprintf (dump_file, ", renamed as %s\n", reg_names[best_new_reg]);
550 520822 : tick[best_new_reg] = ++this_tick;
551 520822 : df_set_regs_ever_live (best_new_reg, true);
552 : }
553 : else
554 : {
555 64 : if (dump_file)
556 0 : fprintf (dump_file, ", renaming as %s failed\n",
557 : reg_names[best_new_reg]);
558 64 : tick[reg] = ++this_tick;
559 : }
560 : }
561 22497 : }
562 :
563 : /* A structure to record information for each hard register at the start of
564 : a basic block. */
565 : struct incoming_reg_info {
566 : /* Holds the number of registers used in the chain that gave us information
567 : about this register. Zero means no information known yet, while a
568 : negative value is used for something that is part of, but not the first
569 : register in a multi-register value. */
570 : int nregs;
571 : /* Set to true if we have accesses that conflict in the number of registers
572 : used. */
573 : bool unusable;
574 : };
575 :
576 : /* A structure recording information about each basic block. It is saved
577 : and restored around basic block boundaries.
578 : A pointer to such a structure is stored in each basic block's aux field
579 : during regrename_analyze, except for blocks we know can't be optimized
580 : (such as entry and exit blocks). */
581 : class bb_rename_info
582 : {
583 : public:
584 : /* The basic block corresponding to this structure. */
585 : basic_block bb;
586 : /* Copies of the global information. */
587 : bitmap_head open_chains_set;
588 : bitmap_head incoming_open_chains_set;
589 : struct incoming_reg_info incoming[FIRST_PSEUDO_REGISTER];
590 : };
591 :
592 : /* Initialize a rename_info structure P for basic block BB, which starts a new
593 : scan. */
594 : static void
595 578146 : init_rename_info (class bb_rename_info *p, basic_block bb)
596 : {
597 578146 : int i;
598 578146 : df_ref def;
599 578146 : HARD_REG_SET start_chains_set;
600 :
601 578146 : p->bb = bb;
602 578146 : bitmap_initialize (&p->open_chains_set, &bitmap_default_obstack);
603 578146 : bitmap_initialize (&p->incoming_open_chains_set, &bitmap_default_obstack);
604 :
605 578146 : open_chains = NULL;
606 578146 : bitmap_clear (&open_chains_set);
607 :
608 2312584 : CLEAR_HARD_REG_SET (live_in_chains);
609 578146 : REG_SET_TO_HARD_REG_SET (live_hard_regs, df_get_live_in (bb));
610 1156693 : FOR_EACH_ARTIFICIAL_DEF (def, bb->index)
611 401 : if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
612 401 : SET_HARD_REG_BIT (live_hard_regs, DF_REF_REGNO (def));
613 :
614 : /* Open chains based on information from (at least one) predecessor
615 : block. This gives us a chance later on to combine chains across
616 : basic block boundaries. Inconsistencies (in access sizes) will
617 : be caught normally and dealt with conservatively by disabling the
618 : chain for renaming, and there is no risk of losing optimization
619 : opportunities by opening chains either: if we did not open the
620 : chains, we'd have to track the live register as a hard reg, and
621 : we'd be unable to rename it in any case. */
622 53767578 : CLEAR_HARD_REG_SET (start_chains_set);
623 53767578 : for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
624 : {
625 53189432 : struct incoming_reg_info *iri = p->incoming + i;
626 3675769 : if (iri->nregs > 0 && !iri->unusable
627 60540970 : && range_in_hard_reg_set_p (live_hard_regs, i, iri->nregs))
628 : {
629 3225528 : SET_HARD_REG_BIT (start_chains_set, i);
630 3225528 : remove_range_from_hard_reg_set (&live_hard_regs, i, iri->nregs);
631 : }
632 : }
633 53767578 : for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
634 : {
635 53189432 : struct incoming_reg_info *iri = p->incoming + i;
636 53189432 : if (TEST_HARD_REG_BIT (start_chains_set, i))
637 : {
638 3225528 : du_head_p chain;
639 3225528 : if (dump_file)
640 728 : fprintf (dump_file, "opening incoming chain\n");
641 3225528 : chain = create_new_chain (i, iri->nregs, NULL, NULL, NO_REGS);
642 3225528 : bitmap_set_bit (&p->incoming_open_chains_set, chain->id);
643 : }
644 : }
645 578146 : }
646 :
647 : /* Record in RI that the block corresponding to it has an incoming
648 : live value, described by CHAIN. */
649 : static void
650 5599911 : set_incoming_from_chain (class bb_rename_info *ri, du_head_p chain)
651 : {
652 5599911 : int i;
653 5599911 : int incoming_nregs = ri->incoming[chain->regno].nregs;
654 5599911 : int nregs;
655 :
656 : /* If we've recorded the same information before, everything is fine. */
657 5599911 : if (incoming_nregs == chain->nregs)
658 : {
659 1922365 : if (dump_file)
660 358 : fprintf (dump_file, "reg %d/%d already recorded\n",
661 : chain->regno, chain->nregs);
662 1922365 : return;
663 : }
664 :
665 : /* If we have no information for any of the involved registers, update
666 : the incoming array. */
667 : nregs = chain->nregs;
668 7355092 : while (nregs-- > 0)
669 3677546 : if (ri->incoming[chain->regno + nregs].nregs != 0
670 3677546 : || ri->incoming[chain->regno + nregs].unusable)
671 : break;
672 3677546 : if (nregs < 0)
673 : {
674 3677546 : nregs = chain->nregs;
675 3677546 : ri->incoming[chain->regno].nregs = nregs;
676 3677546 : while (nregs-- > 1)
677 0 : ri->incoming[chain->regno + nregs].nregs = -nregs;
678 3677546 : if (dump_file)
679 840 : fprintf (dump_file, "recorded reg %d/%d\n",
680 : chain->regno, chain->nregs);
681 3677546 : return;
682 : }
683 :
684 : /* There must be some kind of conflict. Prevent both the old and
685 : new ranges from being used. */
686 0 : if (incoming_nregs < 0)
687 0 : ri->incoming[chain->regno + incoming_nregs].unusable = true;
688 0 : for (i = 0; i < chain->nregs; i++)
689 0 : ri->incoming[chain->regno + i].unusable = true;
690 : }
691 :
692 : /* Merge the two chains C1 and C2 so that all conflict information is
693 : recorded and C1, and the id of C2 is changed to that of C1. */
694 : static void
695 4657341 : merge_chains (du_head_p c1, du_head_p c2)
696 : {
697 4657341 : if (c1 == c2)
698 : return;
699 :
700 3355593 : if (c2->first != NULL)
701 : {
702 1015058 : if (c1->first == NULL)
703 45312 : c1->first = c2->first;
704 : else
705 969746 : c1->last->next_use = c2->first;
706 1015058 : c1->last = c2->last;
707 : }
708 :
709 3355593 : c2->first = c2->last = NULL;
710 3355593 : c2->id = c1->id;
711 :
712 3355593 : c1->hard_conflicts |= c2->hard_conflicts;
713 3355593 : bitmap_ior_into (&c1->conflicts, &c2->conflicts);
714 :
715 3355593 : c1->call_clobber_mask |= c2->call_clobber_mask;
716 3355593 : c1->call_abis |= c2->call_abis;
717 3355593 : c1->cannot_rename |= c2->cannot_rename;
718 : }
719 :
720 : /* Analyze the current function and build chains for renaming.
721 : If INCLUDE_ALL_BLOCKS_P is set to true, process all blocks,
722 : ignoring BB_DISABLE_SCHEDULE. The default value is true. */
723 :
724 : void
725 22497 : regrename_analyze (bitmap bb_mask, bool include_all_block_p)
726 : {
727 22497 : class bb_rename_info *rename_info;
728 22497 : int i;
729 22497 : basic_block bb;
730 22497 : int n_bbs;
731 22497 : int *inverse_postorder;
732 :
733 22497 : inverse_postorder = XNEWVEC (int, last_basic_block_for_fn (cfun));
734 22497 : n_bbs = pre_and_rev_post_order_compute (NULL, inverse_postorder, false);
735 :
736 : /* Gather some information about the blocks in this function. */
737 22497 : rename_info = XCNEWVEC (class bb_rename_info, n_basic_blocks_for_fn (cfun));
738 22497 : i = 0;
739 600643 : FOR_EACH_BB_FN (bb, cfun)
740 : {
741 578146 : class bb_rename_info *ri = rename_info + i;
742 578146 : ri->bb = bb;
743 578146 : if (bb_mask != NULL && !bitmap_bit_p (bb_mask, bb->index))
744 0 : bb->aux = NULL;
745 : else
746 578146 : bb->aux = ri;
747 578146 : i++;
748 : }
749 :
750 22497 : current_id = 0;
751 22497 : id_to_chain.create (0);
752 22497 : bitmap_initialize (&open_chains_set, &bitmap_default_obstack);
753 :
754 : /* The order in which we visit blocks ensures that whenever
755 : possible, we only process a block after at least one of its
756 : predecessors, which provides a "seeding" effect to make the logic
757 : in set_incoming_from_chain and init_rename_info useful. */
758 :
759 600643 : for (i = 0; i < n_bbs; i++)
760 : {
761 578146 : basic_block bb1 = BASIC_BLOCK_FOR_FN (cfun, inverse_postorder[i]);
762 578146 : class bb_rename_info *this_info;
763 578146 : bool success;
764 578146 : edge e;
765 578146 : edge_iterator ei;
766 578146 : int old_length = id_to_chain.length ();
767 :
768 578146 : this_info = (class bb_rename_info *) bb1->aux;
769 578146 : if (this_info == NULL)
770 0 : continue;
771 :
772 578146 : if (dump_file)
773 100 : fprintf (dump_file, "\nprocessing block %d:\n", bb1->index);
774 :
775 578146 : if (!include_all_block_p && (bb1->flags & BB_DISABLE_SCHEDULE) != 0)
776 : {
777 0 : if (dump_file)
778 0 : fprintf (dump_file, "avoid disrupting the sms schedule of bb %d\n",
779 : bb1->index);
780 0 : continue;
781 : }
782 :
783 578146 : init_rename_info (this_info, bb1);
784 :
785 578146 : success = build_def_use (bb1);
786 578146 : if (!success)
787 : {
788 0 : if (dump_file)
789 0 : fprintf (dump_file, "failed\n");
790 0 : bb1->aux = NULL;
791 0 : id_to_chain.truncate (old_length);
792 0 : current_id = old_length;
793 0 : bitmap_clear (&this_info->incoming_open_chains_set);
794 0 : open_chains = NULL;
795 0 : if (insn_rr.exists ())
796 : {
797 0 : rtx_insn *insn;
798 0 : FOR_BB_INSNS (bb1, insn)
799 : {
800 0 : insn_rr_info *p = &insn_rr[INSN_UID (insn)];
801 0 : p->op_info = NULL;
802 : }
803 : }
804 0 : continue;
805 0 : }
806 :
807 578146 : if (dump_file)
808 100 : dump_def_use_chain (old_length);
809 578146 : bitmap_copy (&this_info->open_chains_set, &open_chains_set);
810 :
811 : /* Add successor blocks to the worklist if necessary, and record
812 : data about our own open chains at the end of this block, which
813 : will be used to pre-open chains when processing the successors. */
814 1473854 : FOR_EACH_EDGE (e, ei, bb1->succs)
815 : {
816 895708 : class bb_rename_info *dest_ri;
817 895708 : class du_head *chain;
818 :
819 895708 : if (dump_file)
820 152 : fprintf (dump_file, "successor block %d\n", e->dest->index);
821 :
822 895708 : if (e->flags & (EDGE_EH | EDGE_ABNORMAL))
823 3500 : continue;
824 892208 : dest_ri = (class bb_rename_info *)e->dest->aux;
825 892208 : if (dest_ri == NULL)
826 22091 : continue;
827 6470028 : for (chain = open_chains; chain; chain = chain->next_chain)
828 5599911 : set_incoming_from_chain (dest_ri, chain);
829 : }
830 : }
831 :
832 22497 : free (inverse_postorder);
833 :
834 : /* Now, combine the chains data we have gathered across basic block
835 : boundaries.
836 :
837 : For every basic block, there may be chains open at the start, or at the
838 : end. Rather than exclude them from renaming, we look for open chains
839 : with matching registers at the other side of the CFG edge.
840 :
841 : For a given chain using register R, open at the start of block B, we
842 : must find an open chain using R on the other side of every edge leading
843 : to B, if the register is live across this edge. In the code below,
844 : N_PREDS_USED counts the number of edges where the register is live, and
845 : N_PREDS_JOINED counts those where we found an appropriate chain for
846 : joining.
847 :
848 : We perform the analysis for both incoming and outgoing edges, but we
849 : only need to merge once (in the second part, after verifying outgoing
850 : edges). */
851 600643 : FOR_EACH_BB_FN (bb, cfun)
852 : {
853 578146 : class bb_rename_info *bb_ri = (class bb_rename_info *) bb->aux;
854 578146 : unsigned j;
855 578146 : bitmap_iterator bi;
856 :
857 578146 : if (bb_ri == NULL)
858 0 : continue;
859 :
860 578146 : if (dump_file)
861 100 : fprintf (dump_file, "processing bb %d in edges\n", bb->index);
862 :
863 3803674 : EXECUTE_IF_SET_IN_BITMAP (&bb_ri->incoming_open_chains_set, 0, j, bi)
864 : {
865 3225528 : edge e;
866 3225528 : edge_iterator ei;
867 3225528 : class du_head *chain = regrename_chain_from_id (j);
868 3225528 : int n_preds_used = 0, n_preds_joined = 0;
869 :
870 7890948 : FOR_EACH_EDGE (e, ei, bb->preds)
871 : {
872 : class bb_rename_info *src_ri;
873 : unsigned k;
874 : bitmap_iterator bi2;
875 : HARD_REG_SET live;
876 13996260 : bool success = false;
877 :
878 4665420 : REG_SET_TO_HARD_REG_SET (live, df_get_live_out (e->src));
879 9330840 : if (!range_overlaps_hard_reg_set_p (live, chain->regno,
880 : chain->nregs))
881 78 : continue;
882 4665356 : n_preds_used++;
883 :
884 4665356 : if (e->flags & (EDGE_EH | EDGE_ABNORMAL))
885 14 : continue;
886 :
887 4665342 : src_ri = (class bb_rename_info *)e->src->aux;
888 4665342 : if (src_ri == NULL)
889 0 : continue;
890 :
891 26408673 : EXECUTE_IF_SET_IN_BITMAP (&src_ri->open_chains_set,
892 : 0, k, bi2)
893 : {
894 26400661 : class du_head *outgoing_chain = regrename_chain_from_id (k);
895 :
896 26400661 : if (outgoing_chain->regno == chain->regno
897 4657330 : && outgoing_chain->nregs == chain->nregs)
898 : {
899 4657330 : n_preds_joined++;
900 4657330 : success = true;
901 4657330 : break;
902 : }
903 : }
904 4665342 : if (!success && dump_file)
905 4 : fprintf (dump_file, "failure to match with pred block %d\n",
906 4 : e->src->index);
907 : }
908 3225528 : if (n_preds_joined < n_preds_used)
909 : {
910 4874 : if (dump_file)
911 4 : fprintf (dump_file, "cannot rename chain %d\n", j);
912 4874 : chain->cannot_rename = 1;
913 : }
914 : }
915 : }
916 600643 : FOR_EACH_BB_FN (bb, cfun)
917 : {
918 578146 : class bb_rename_info *bb_ri = (class bb_rename_info *) bb->aux;
919 578146 : unsigned j;
920 578146 : bitmap_iterator bi;
921 :
922 578146 : if (bb_ri == NULL)
923 0 : continue;
924 :
925 578146 : if (dump_file)
926 100 : fprintf (dump_file, "processing bb %d out edges\n", bb->index);
927 :
928 3989760 : EXECUTE_IF_SET_IN_BITMAP (&bb_ri->open_chains_set, 0, j, bi)
929 : {
930 3411614 : edge e;
931 3411614 : edge_iterator ei;
932 3411614 : class du_head *chain = regrename_chain_from_id (j);
933 3411614 : int n_succs_used = 0, n_succs_joined = 0;
934 :
935 9047580 : FOR_EACH_EDGE (e, ei, bb->succs)
936 : {
937 16907898 : bool printed = false;
938 : class bb_rename_info *dest_ri;
939 : unsigned k;
940 : bitmap_iterator bi2;
941 : HARD_REG_SET live;
942 :
943 5635966 : REG_SET_TO_HARD_REG_SET (live, df_get_live_in (e->dest));
944 11271932 : if (!range_overlaps_hard_reg_set_p (live, chain->regno,
945 : chain->nregs))
946 977832 : continue;
947 :
948 4693294 : n_succs_used++;
949 :
950 4693294 : dest_ri = (class bb_rename_info *)e->dest->aux;
951 4693294 : if (dest_ri == NULL)
952 35160 : continue;
953 :
954 25168225 : EXECUTE_IF_SET_IN_BITMAP (&dest_ri->incoming_open_chains_set,
955 : 0, k, bi2)
956 : {
957 25167432 : class du_head *incoming_chain = regrename_chain_from_id (k);
958 :
959 25167432 : if (incoming_chain->regno == chain->regno
960 4657341 : && incoming_chain->nregs == chain->nregs)
961 : {
962 4657341 : if (dump_file)
963 : {
964 1072 : if (!printed)
965 1072 : fprintf (dump_file,
966 : "merging blocks for edge %d -> %d\n",
967 1072 : e->src->index, e->dest->index);
968 1072 : printed = true;
969 1072 : fprintf (dump_file,
970 : " merging chains %d (->%d) and %d (->%d) [%s]\n",
971 : k, incoming_chain->id, j, chain->id,
972 1072 : reg_names[incoming_chain->regno]);
973 : }
974 :
975 4657341 : merge_chains (chain, incoming_chain);
976 4657341 : n_succs_joined++;
977 4657341 : break;
978 : }
979 : }
980 : }
981 3411614 : if (n_succs_joined < n_succs_used)
982 : {
983 35889 : if (dump_file)
984 12 : fprintf (dump_file, "cannot rename chain %d\n",
985 : j);
986 35889 : chain->cannot_rename = 1;
987 : }
988 : }
989 : }
990 :
991 22497 : free (rename_info);
992 :
993 600643 : FOR_EACH_BB_FN (bb, cfun)
994 578146 : bb->aux = NULL;
995 22497 : }
996 :
997 : /* Attempt to replace all uses of the register in the chain beginning with
998 : HEAD with REG. Returns true on success and false if the replacement is
999 : rejected because the insns would not validate. The latter can happen
1000 : e.g. if a match_parallel predicate enforces restrictions on register
1001 : numbering in its subpatterns. */
1002 :
1003 : bool
1004 520886 : regrename_do_replace (class du_head *head, int reg)
1005 : {
1006 520886 : struct du_chain *chain;
1007 520886 : unsigned int base_regno = head->regno;
1008 520886 : machine_mode mode;
1009 520886 : rtx last_reg = NULL_RTX, last_repl = NULL_RTX;
1010 :
1011 2412982 : for (chain = head->first; chain; chain = chain->next_use)
1012 : {
1013 1892096 : unsigned int regno = ORIGINAL_REGNO (*chain->loc);
1014 1892096 : class reg_attrs *attr = REG_ATTRS (*chain->loc);
1015 1892096 : int reg_ptr = REG_POINTER (*chain->loc);
1016 :
1017 1892096 : if (DEBUG_INSN_P (chain->insn) && REGNO (*chain->loc) != base_regno)
1018 310 : validate_change (chain->insn, &(INSN_VAR_LOCATION_LOC (chain->insn)),
1019 : gen_rtx_UNKNOWN_VAR_LOC (), true);
1020 : else
1021 : {
1022 1891786 : if (*chain->loc != last_reg)
1023 : {
1024 1031198 : last_repl = gen_raw_REG (GET_MODE (*chain->loc), reg);
1025 1031198 : if (regno >= FIRST_PSEUDO_REGISTER)
1026 1010863 : ORIGINAL_REGNO (last_repl) = regno;
1027 1031198 : REG_ATTRS (last_repl) = attr;
1028 1031198 : REG_POINTER (last_repl) = reg_ptr;
1029 1031198 : last_reg = *chain->loc;
1030 : }
1031 1891786 : validate_change (chain->insn, chain->loc, last_repl, true);
1032 : }
1033 : }
1034 :
1035 520886 : if (!apply_change_group ())
1036 : return false;
1037 :
1038 520822 : mode = GET_MODE (*head->first->loc);
1039 520822 : head->renamed = 1;
1040 520822 : head->regno = reg;
1041 520822 : head->nregs = hard_regno_nregs (reg, mode);
1042 520822 : return true;
1043 : }
1044 :
1045 :
1046 : /* True if we found a register with a size mismatch, which means that we
1047 : can't track its lifetime accurately. If so, we abort the current block
1048 : without renaming. */
1049 : static bool fail_current_block;
1050 :
1051 : /* Return true if OP is a reg for which all bits are set in PSET, false
1052 : if all bits are clear.
1053 : In other cases, set fail_current_block and return false. */
1054 :
1055 : static bool
1056 2353047 : verify_reg_in_set (rtx op, HARD_REG_SET *pset)
1057 : {
1058 2353047 : unsigned regno, nregs;
1059 2353047 : bool all_live, all_dead;
1060 2353047 : if (!REG_P (op))
1061 : return false;
1062 :
1063 2343131 : regno = REGNO (op);
1064 2343131 : nregs = REG_NREGS (op);
1065 2343131 : all_live = all_dead = true;
1066 4686284 : while (nregs-- > 0)
1067 2343153 : if (TEST_HARD_REG_BIT (*pset, regno + nregs))
1068 : all_dead = false;
1069 : else
1070 1129834 : all_live = false;
1071 2343131 : if (!all_dead && !all_live)
1072 : {
1073 0 : fail_current_block = true;
1074 0 : return false;
1075 : }
1076 : return all_live;
1077 : }
1078 :
1079 : /* Return true if OP is a reg that is being tracked already in some form.
1080 : May set fail_current_block if it sees an unhandled case of overlap. */
1081 :
1082 : static bool
1083 1209322 : verify_reg_tracked (rtx op)
1084 : {
1085 1209322 : return (verify_reg_in_set (op, &live_hard_regs)
1086 1209322 : || verify_reg_in_set (op, &live_in_chains));
1087 : }
1088 :
1089 : /* Called through note_stores. DATA points to a rtx_code, either SET or
1090 : CLOBBER, which tells us which kind of rtx to look at. If we have a
1091 : match, record the set register in live_hard_regs and in the hard_conflicts
1092 : bitmap of open chains. */
1093 :
1094 : static void
1095 8164412 : note_sets_clobbers (rtx x, const_rtx set, void *data)
1096 : {
1097 8164412 : enum rtx_code code = *(enum rtx_code *)data;
1098 8164412 : class du_head *chain;
1099 :
1100 8164412 : if (GET_CODE (x) == SUBREG)
1101 0 : x = SUBREG_REG (x);
1102 8164412 : if (!REG_P (x) || GET_CODE (set) != code)
1103 : return;
1104 : /* There must not be pseudos at this point. */
1105 938454 : gcc_assert (HARD_REGISTER_P (x));
1106 938454 : add_to_hard_reg_set (&live_hard_regs, GET_MODE (x), REGNO (x));
1107 7313748 : for (chain = open_chains; chain; chain = chain->next_chain)
1108 6375294 : add_to_hard_reg_set (&chain->hard_conflicts, GET_MODE (x), REGNO (x));
1109 : }
1110 :
1111 : static void
1112 17528634 : scan_rtx_reg (rtx_insn *insn, rtx *loc, enum reg_class cl, enum scan_actions action,
1113 : enum op_type type)
1114 : {
1115 17528634 : class du_head **p;
1116 17528634 : rtx x = *loc;
1117 17528634 : unsigned this_regno = REGNO (x);
1118 17528634 : int this_nregs = REG_NREGS (x);
1119 :
1120 : /* Do not process write actions for the second instruction of
1121 : a macro-fused pair of two single_sets. */
1122 17528634 : if ((action == mark_write || action == terminate_write)
1123 17528634 : && single_output_fused_pair_p (insn))
1124 : return;
1125 :
1126 17528634 : if (action == mark_write)
1127 : {
1128 1450976 : if (type == OP_OUT)
1129 : {
1130 1450976 : du_head_p c;
1131 1450976 : rtx pat = PATTERN (insn);
1132 :
1133 1450976 : c = create_new_chain (this_regno, this_nregs, loc, insn, cl);
1134 :
1135 : /* We try to tie chains in a move instruction for
1136 : a single output. */
1137 1450976 : if (recog_data.n_operands == 2
1138 1307099 : && GET_CODE (pat) == SET
1139 1228028 : && GET_CODE (SET_DEST (pat)) == REG
1140 1228028 : && GET_CODE (SET_SRC (pat)) == REG
1141 203401 : && terminated_this_insn
1142 60796 : && terminated_this_insn->nregs
1143 60796 : == REG_NREGS (recog_data.operand[1]))
1144 : {
1145 60756 : gcc_assert (terminated_this_insn->regno
1146 : == REGNO (recog_data.operand[1]));
1147 :
1148 60756 : c->tied_chain = terminated_this_insn;
1149 60756 : terminated_this_insn->tied_chain = c;
1150 :
1151 60756 : if (dump_file)
1152 4 : fprintf (dump_file, "Tying chain %s (%d) with %s (%d)\n",
1153 4 : reg_names[c->regno], c->id,
1154 : reg_names[terminated_this_insn->regno],
1155 : terminated_this_insn->id);
1156 : }
1157 : }
1158 :
1159 1450976 : return;
1160 : }
1161 :
1162 16077658 : if ((type == OP_OUT) != (action == terminate_write || action == mark_access)
1163 17528664 : && ! (type == OP_OUT && action == mark_read
1164 1451006 : && single_output_fused_pair_p (insn)))
1165 6046280 : return;
1166 :
1167 85985333 : for (p = &open_chains; *p;)
1168 : {
1169 76044682 : class du_head *head = *p;
1170 76044682 : class du_head *next = head->next_chain;
1171 152089364 : int exact_match = (head->regno == this_regno
1172 76044682 : && head->nregs == this_nregs);
1173 152089364 : int superset = (this_regno <= head->regno
1174 76044682 : && this_regno + this_nregs >= head->regno + head->nregs);
1175 152089364 : int subset = (this_regno >= head->regno
1176 76044682 : && this_regno + this_nregs <= head->regno + head->nregs);
1177 :
1178 76044682 : if (!bitmap_bit_p (&open_chains_set, head->id)
1179 76044682 : || head->regno + head->nregs <= this_regno
1180 120793220 : || this_regno + this_nregs <= head->regno)
1181 : {
1182 70660794 : p = &head->next_chain;
1183 70660794 : continue;
1184 : }
1185 :
1186 5383888 : if (action == mark_read || action == mark_access)
1187 : {
1188 : /* ??? Class NO_REGS can happen if the md file makes use of
1189 : EXTRA_CONSTRAINTS to match registers. Which is arguably
1190 : wrong, but there we are. */
1191 :
1192 3799457 : if (cl == NO_REGS || (!exact_match && !DEBUG_INSN_P (insn)))
1193 : {
1194 4124 : if (dump_file)
1195 0 : fprintf (dump_file,
1196 : "Cannot rename chain %s (%d) at insn %d (%s)\n",
1197 0 : reg_names[head->regno], head->id, INSN_UID (insn),
1198 0 : scan_actions_name[(int) action]);
1199 4124 : head->cannot_rename = 1;
1200 4124 : if (superset)
1201 : {
1202 19 : unsigned nregs = this_nregs;
1203 19 : head->regno = this_regno;
1204 19 : head->nregs = this_nregs;
1205 48 : while (nregs-- > 0)
1206 29 : SET_HARD_REG_BIT (live_in_chains, head->regno + nregs);
1207 19 : if (dump_file)
1208 0 : fprintf (dump_file,
1209 : "Widening register in chain %s (%d) at insn %d\n",
1210 0 : reg_names[head->regno], head->id, INSN_UID (insn));
1211 : }
1212 4105 : else if (!subset)
1213 : {
1214 0 : fail_current_block = true;
1215 0 : if (dump_file)
1216 0 : fprintf (dump_file,
1217 : "Failing basic block due to unhandled overlap\n");
1218 : }
1219 : }
1220 : else
1221 : {
1222 3795333 : struct du_chain *this_du;
1223 3795333 : this_du = XOBNEW (&rename_obstack, struct du_chain);
1224 3795333 : this_du->next_use = 0;
1225 3795333 : this_du->loc = loc;
1226 3795333 : this_du->insn = insn;
1227 3795333 : this_du->cl = cl;
1228 3795333 : if (head->first == NULL)
1229 839690 : head->first = this_du;
1230 : else
1231 2955643 : head->last->next_use = this_du;
1232 3795333 : record_operand_use (head, this_du);
1233 3795333 : head->last = this_du;
1234 : }
1235 : /* Avoid adding the same location in a DEBUG_INSN multiple times,
1236 : which could happen with non-exact overlap. */
1237 3799457 : if (DEBUG_INSN_P (insn))
1238 : return;
1239 : /* Otherwise, find any other chains that do not match exactly;
1240 : ensure they all get marked unrenamable. */
1241 3708730 : p = &head->next_chain;
1242 3708730 : continue;
1243 3708730 : }
1244 :
1245 : /* Whether the terminated chain can be used for renaming
1246 : depends on the action and this being an exact match.
1247 : In either case, we remove this element from open_chains. */
1248 :
1249 1584431 : if ((action == terminate_dead || action == terminate_write)
1250 1264899 : && (superset || subset))
1251 : {
1252 1264899 : unsigned nregs;
1253 :
1254 1264899 : if (subset && !superset)
1255 1652 : head->cannot_rename = 1;
1256 1264899 : bitmap_clear_bit (&open_chains_set, head->id);
1257 :
1258 1264899 : nregs = head->nregs;
1259 2531450 : while (nregs-- > 0)
1260 : {
1261 1266551 : CLEAR_HARD_REG_BIT (live_in_chains, head->regno + nregs);
1262 1266551 : if (subset && !superset
1263 3304 : && (head->regno + nregs < this_regno
1264 2496 : || head->regno + nregs >= this_regno + this_nregs))
1265 1652 : SET_HARD_REG_BIT (live_hard_regs, head->regno + nregs);
1266 : }
1267 :
1268 1264899 : if (action == terminate_dead)
1269 1129067 : terminated_this_insn = *p;
1270 1264899 : *p = next;
1271 1264899 : if (dump_file)
1272 106 : fprintf (dump_file,
1273 : "Closing chain %s (%d) at insn %d (%s%s)\n",
1274 106 : reg_names[head->regno], head->id, INSN_UID (insn),
1275 106 : scan_actions_name[(int) action],
1276 0 : superset ? ", superset" : subset ? ", subset" : "");
1277 : }
1278 0 : else if (action == terminate_dead || action == terminate_write)
1279 : {
1280 : /* In this case, tracking liveness gets too hard. Fail the
1281 : entire basic block. */
1282 0 : if (dump_file)
1283 0 : fprintf (dump_file,
1284 : "Failing basic block due to unhandled overlap\n");
1285 0 : fail_current_block = true;
1286 0 : return;
1287 : }
1288 : else
1289 : {
1290 319532 : head->cannot_rename = 1;
1291 319532 : if (dump_file)
1292 14 : fprintf (dump_file,
1293 : "Cannot rename chain %s (%d) at insn %d (%s)\n",
1294 14 : reg_names[head->regno], head->id, INSN_UID (insn),
1295 14 : scan_actions_name[(int) action]);
1296 319532 : p = &head->next_chain;
1297 : }
1298 : }
1299 : }
1300 :
1301 : /* A wrapper around base_reg_class which returns ALL_REGS if INSN is a
1302 : DEBUG_INSN. The arguments MODE, AS, CODE and INDEX_CODE are as for
1303 : base_reg_class. */
1304 :
1305 : static reg_class
1306 6523738 : base_reg_class_for_rename (rtx_insn *insn, machine_mode mode, addr_space_t as,
1307 : rtx_code code, rtx_code index_code)
1308 : {
1309 0 : if (DEBUG_INSN_P (insn))
1310 : return ALL_REGS;
1311 6379556 : return base_reg_class (mode, as, code, index_code);
1312 : }
1313 :
1314 : /* Adapted from find_reloads_address_1. CL is INDEX_REG_CLASS or
1315 : BASE_REG_CLASS depending on how the register is being considered. */
1316 :
1317 : static void
1318 7733124 : scan_rtx_address (rtx_insn *insn, rtx *loc, enum reg_class cl,
1319 : enum scan_actions action, machine_mode mode,
1320 : addr_space_t as)
1321 : {
1322 7733124 : rtx x = *loc;
1323 7733124 : RTX_CODE code = GET_CODE (x);
1324 7733124 : const char *fmt;
1325 7733124 : int i, j;
1326 :
1327 7733124 : if (action == mark_write || action == mark_access)
1328 : return;
1329 :
1330 7148000 : switch (code)
1331 : {
1332 2640026 : case PLUS:
1333 2640026 : {
1334 2640026 : rtx orig_op0 = XEXP (x, 0);
1335 2640026 : rtx orig_op1 = XEXP (x, 1);
1336 2640026 : RTX_CODE code0 = GET_CODE (orig_op0);
1337 2640026 : RTX_CODE code1 = GET_CODE (orig_op1);
1338 2640026 : rtx op0 = orig_op0;
1339 2640026 : rtx op1 = orig_op1;
1340 2640026 : rtx *locI = NULL;
1341 2640026 : rtx *locB = NULL;
1342 2640026 : enum rtx_code index_code = SCRATCH;
1343 :
1344 2640026 : if (GET_CODE (op0) == SUBREG)
1345 : {
1346 0 : op0 = SUBREG_REG (op0);
1347 0 : code0 = GET_CODE (op0);
1348 : }
1349 :
1350 2640026 : if (GET_CODE (op1) == SUBREG)
1351 : {
1352 0 : op1 = SUBREG_REG (op1);
1353 0 : code1 = GET_CODE (op1);
1354 : }
1355 :
1356 2640026 : if (code0 == MULT || code0 == SIGN_EXTEND || code0 == TRUNCATE
1357 2484126 : || code0 == ZERO_EXTEND || code1 == MEM)
1358 : {
1359 155946 : locI = &XEXP (x, 0);
1360 155946 : locB = &XEXP (x, 1);
1361 155946 : index_code = GET_CODE (*locI);
1362 : }
1363 2484080 : else if (code1 == MULT || code1 == SIGN_EXTEND || code1 == TRUNCATE
1364 2484073 : || code1 == ZERO_EXTEND || code0 == MEM)
1365 : {
1366 391 : locI = &XEXP (x, 1);
1367 391 : locB = &XEXP (x, 0);
1368 391 : index_code = GET_CODE (*locI);
1369 : }
1370 2483689 : else if (code0 == CONST_INT || code0 == CONST
1371 2483689 : || code0 == SYMBOL_REF || code0 == LABEL_REF)
1372 : {
1373 77883 : locB = &XEXP (x, 1);
1374 77883 : index_code = GET_CODE (XEXP (x, 0));
1375 : }
1376 2405806 : else if (code1 == CONST_INT || code1 == CONST
1377 : || code1 == SYMBOL_REF || code1 == LABEL_REF)
1378 : {
1379 2157130 : locB = &XEXP (x, 0);
1380 2157130 : index_code = GET_CODE (XEXP (x, 1));
1381 : }
1382 248676 : else if (code0 == REG && code1 == REG)
1383 : {
1384 216991 : int index_op;
1385 216991 : unsigned regno0 = REGNO (op0), regno1 = REGNO (op1);
1386 :
1387 9 : if (REGNO_OK_FOR_INDEX_P (regno1)
1388 216991 : && regno_ok_for_base_p (regno0, mode, as, PLUS, REG))
1389 : index_op = 1;
1390 0 : else if (REGNO_OK_FOR_INDEX_P (regno0)
1391 9 : && regno_ok_for_base_p (regno1, mode, as, PLUS, REG))
1392 : index_op = 0;
1393 0 : else if (regno_ok_for_base_p (regno0, mode, as, PLUS, REG)
1394 0 : || REGNO_OK_FOR_INDEX_P (regno1))
1395 : index_op = 1;
1396 0 : else if (regno_ok_for_base_p (regno1, mode, as, PLUS, REG))
1397 : index_op = 0;
1398 : else
1399 216982 : index_op = 1;
1400 :
1401 216991 : locI = &XEXP (x, index_op);
1402 216991 : locB = &XEXP (x, !index_op);
1403 216991 : index_code = GET_CODE (*locI);
1404 : }
1405 31685 : else if (code0 == REG)
1406 : {
1407 4475 : locI = &XEXP (x, 0);
1408 4475 : locB = &XEXP (x, 1);
1409 4475 : index_code = GET_CODE (*locI);
1410 : }
1411 27210 : else if (code1 == REG)
1412 : {
1413 27173 : locI = &XEXP (x, 1);
1414 27173 : locB = &XEXP (x, 0);
1415 27173 : index_code = GET_CODE (*locI);
1416 : }
1417 :
1418 2639989 : if (locI)
1419 : {
1420 404976 : reg_class iclass = DEBUG_INSN_P (insn) ? ALL_REGS : INDEX_REG_CLASS;
1421 404976 : scan_rtx_address (insn, locI, iclass, action, mode, as);
1422 : }
1423 2640026 : if (locB)
1424 : {
1425 2639989 : reg_class bclass = base_reg_class_for_rename (insn, mode, as, PLUS,
1426 : index_code);
1427 2639989 : scan_rtx_address (insn, locB, bclass, action, mode, as);
1428 : }
1429 : return;
1430 : }
1431 :
1432 127354 : case POST_INC:
1433 127354 : case POST_DEC:
1434 127354 : case POST_MODIFY:
1435 127354 : case PRE_INC:
1436 127354 : case PRE_DEC:
1437 127354 : case PRE_MODIFY:
1438 : /* If the target doesn't claim to handle autoinc, this must be
1439 : something special, like a stack push. Kill this chain. */
1440 127354 : if (!AUTO_INC_DEC)
1441 127354 : action = mark_all_read;
1442 :
1443 127354 : break;
1444 :
1445 1719 : case MEM:
1446 1719 : {
1447 1719 : reg_class bclass = base_reg_class_for_rename (insn, GET_MODE (x),
1448 1719 : MEM_ADDR_SPACE (x),
1449 : MEM, SCRATCH);
1450 1719 : scan_rtx_address (insn, &XEXP (x, 0), bclass, action, GET_MODE (x),
1451 1719 : MEM_ADDR_SPACE (x));
1452 : }
1453 1719 : return;
1454 :
1455 3239807 : case REG:
1456 3239807 : scan_rtx_reg (insn, loc, cl, action, OP_IN);
1457 3239807 : return;
1458 :
1459 : default:
1460 : break;
1461 : }
1462 :
1463 1266448 : fmt = GET_RTX_FORMAT (code);
1464 2833976 : for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
1465 : {
1466 1567528 : if (fmt[i] == 'e')
1467 601299 : scan_rtx_address (insn, &XEXP (x, i), cl, action, mode, as);
1468 966229 : else if (fmt[i] == 'E')
1469 3552 : for (j = XVECLEN (x, i) - 1; j >= 0; j--)
1470 1900 : scan_rtx_address (insn, &XVECEXP (x, i, j), cl, action, mode, as);
1471 : }
1472 : }
1473 :
1474 : static void
1475 39346989 : scan_rtx (rtx_insn *insn, rtx *loc, enum reg_class cl, enum scan_actions action,
1476 : enum op_type type)
1477 : {
1478 47716164 : const char *fmt;
1479 47716164 : rtx x = *loc;
1480 47716164 : int i, j;
1481 :
1482 47716164 : enum rtx_code code = GET_CODE (x);
1483 47716164 : switch (code)
1484 : {
1485 : case CONST:
1486 : CASE_CONST_ANY:
1487 : case SYMBOL_REF:
1488 : case LABEL_REF:
1489 : case PC:
1490 : return;
1491 :
1492 14288827 : case REG:
1493 14288827 : scan_rtx_reg (insn, loc, cl, action, type);
1494 14288827 : return;
1495 :
1496 3882030 : case MEM:
1497 3882030 : {
1498 3882030 : reg_class bclass = base_reg_class_for_rename (insn, GET_MODE (x),
1499 3882030 : MEM_ADDR_SPACE (x),
1500 : MEM, SCRATCH);
1501 :
1502 3882030 : scan_rtx_address (insn, &XEXP (x, 0), bclass, action, GET_MODE (x),
1503 3882030 : MEM_ADDR_SPACE (x));
1504 : }
1505 3882030 : return;
1506 :
1507 7062576 : case SET:
1508 7062576 : scan_rtx (insn, &SET_SRC (x), cl, action, OP_IN);
1509 14125152 : scan_rtx (insn, &SET_DEST (x), cl, action,
1510 7062576 : (GET_CODE (PATTERN (insn)) == COND_EXEC
1511 0 : && verify_reg_tracked (SET_DEST (x))) ? OP_INOUT : OP_OUT);
1512 7062576 : return;
1513 :
1514 3834 : case STRICT_LOW_PART:
1515 3834 : scan_rtx (insn, &XEXP (x, 0), cl, action,
1516 3834 : verify_reg_tracked (XEXP (x, 0)) ? OP_INOUT : OP_OUT);
1517 3834 : return;
1518 :
1519 5322 : case ZERO_EXTRACT:
1520 5322 : case SIGN_EXTRACT:
1521 6446 : scan_rtx (insn, &XEXP (x, 0), cl, action,
1522 : (type == OP_IN ? OP_IN :
1523 1124 : verify_reg_tracked (XEXP (x, 0)) ? OP_INOUT : OP_OUT));
1524 5322 : scan_rtx (insn, &XEXP (x, 1), cl, action, OP_IN);
1525 5322 : scan_rtx (insn, &XEXP (x, 2), cl, action, OP_IN);
1526 5322 : return;
1527 :
1528 0 : case POST_INC:
1529 0 : case PRE_INC:
1530 0 : case POST_DEC:
1531 0 : case PRE_DEC:
1532 0 : case POST_MODIFY:
1533 0 : case PRE_MODIFY:
1534 : /* Should only happen inside MEM. */
1535 0 : gcc_unreachable ();
1536 :
1537 1106358 : case CLOBBER:
1538 2212716 : scan_rtx (insn, &SET_DEST (x), cl, action,
1539 1106358 : (GET_CODE (PATTERN (insn)) == COND_EXEC
1540 0 : && verify_reg_tracked (SET_DEST (x))) ? OP_INOUT : OP_OUT);
1541 1106358 : return;
1542 :
1543 323056 : case EXPR_LIST:
1544 323056 : scan_rtx (insn, &XEXP (x, 0), cl, action, type);
1545 323056 : if (XEXP (x, 1))
1546 191085 : scan_rtx (insn, &XEXP (x, 1), cl, action, type);
1547 : return;
1548 :
1549 6775180 : default:
1550 6775180 : break;
1551 : }
1552 :
1553 6775180 : fmt = GET_RTX_FORMAT (code);
1554 18973304 : for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
1555 : {
1556 12198124 : if (fmt[i] == 'e')
1557 10378363 : scan_rtx (insn, &XEXP (x, i), cl, action, type);
1558 1819761 : else if (fmt[i] == 'E')
1559 4347524 : for (j = XVECLEN (x, i) - 1; j >= 0; j--)
1560 3011520 : scan_rtx (insn, &XVECEXP (x, i, j), cl, action, type);
1561 : }
1562 : }
1563 :
1564 : /* Hide operands of the current insn (of which there are N_OPS) by
1565 : substituting pc for them.
1566 : Previous values are stored in the OLD_OPERANDS and OLD_DUPS.
1567 : For every bit set in DO_NOT_HIDE, we leave the operand alone.
1568 : If INOUT_AND_EC_ONLY is set, we only do this for OP_INOUT type operands
1569 : and earlyclobbers. */
1570 :
1571 : static void
1572 14488108 : hide_operands (int n_ops, rtx *old_operands, rtx *old_dups,
1573 : unsigned HOST_WIDE_INT do_not_hide, bool inout_and_ec_only)
1574 : {
1575 14488108 : int i;
1576 14488108 : const operand_alternative *op_alt = which_op_alt ();
1577 61172304 : for (i = 0; i < n_ops; i++)
1578 : {
1579 32196088 : old_operands[i] = recog_data.operand[i];
1580 : /* Don't squash match_operator or match_parallel here, since
1581 : we don't know that all of the contained registers are
1582 : reachable by proper operands. */
1583 32196088 : if (recog_data.constraints[i][0] == '\0')
1584 5326988 : continue;
1585 26869100 : if (do_not_hide & (1 << i))
1586 1528 : continue;
1587 26867572 : if (!inout_and_ec_only || recog_data.operand_type[i] == OP_INOUT
1588 5460658 : || op_alt[i].earlyclobber)
1589 21406996 : *recog_data.operand_loc[i] = pc_rtx;
1590 : }
1591 14846112 : for (i = 0; i < recog_data.n_dups; i++)
1592 : {
1593 358004 : int opn = recog_data.dup_num[i];
1594 358004 : old_dups[i] = *recog_data.dup_loc[i];
1595 358004 : if (do_not_hide & (1 << opn))
1596 0 : continue;
1597 358004 : if (!inout_and_ec_only || recog_data.operand_type[opn] == OP_INOUT
1598 46863 : || op_alt[opn].earlyclobber)
1599 311141 : *recog_data.dup_loc[i] = pc_rtx;
1600 : }
1601 14488108 : }
1602 :
1603 : /* Undo the substitution performed by hide_operands. INSN is the insn we
1604 : are processing; the arguments are the same as in hide_operands. */
1605 :
1606 : static void
1607 14488108 : restore_operands (rtx_insn *insn, int n_ops, rtx *old_operands, rtx *old_dups)
1608 : {
1609 14488108 : int i;
1610 14846112 : for (i = 0; i < recog_data.n_dups; i++)
1611 358004 : *recog_data.dup_loc[i] = old_dups[i];
1612 46684196 : for (i = 0; i < n_ops; i++)
1613 32196088 : *recog_data.operand_loc[i] = old_operands[i];
1614 14488108 : if (recog_data.n_dups)
1615 196848 : df_insn_rescan (insn);
1616 14488108 : }
1617 :
1618 : /* For each output operand of INSN, call scan_rtx to create a new
1619 : open chain. Do this only for normal or earlyclobber outputs,
1620 : depending on EARLYCLOBBER. If INSN_INFO is nonnull, use it to
1621 : record information about the operands in the insn. */
1622 :
1623 : static void
1624 7244054 : record_out_operands (rtx_insn *insn, bool earlyclobber, insn_rr_info *insn_info)
1625 : {
1626 7244054 : int n_ops = recog_data.n_operands;
1627 7244054 : const operand_alternative *op_alt = which_op_alt ();
1628 :
1629 7244054 : int i;
1630 :
1631 23521100 : for (i = 0; i < n_ops + recog_data.n_dups; i++)
1632 : {
1633 16277046 : int opn = i < n_ops ? i : recog_data.dup_num[i - n_ops];
1634 16098044 : rtx *loc = (i < n_ops
1635 16277046 : ? recog_data.operand_loc[opn]
1636 179002 : : recog_data.dup_loc[i - n_ops]);
1637 16277046 : rtx op = *loc;
1638 16277046 : enum reg_class cl = alternative_class (op_alt, opn);
1639 :
1640 16277046 : class du_head *prev_open;
1641 :
1642 16277046 : if (recog_data.operand_type[opn] != OP_OUT
1643 4072200 : || op_alt[opn].earlyclobber != earlyclobber)
1644 14240946 : continue;
1645 :
1646 2036100 : if (insn_info)
1647 0 : cur_operand = insn_info->op_info + i;
1648 :
1649 2036100 : prev_open = open_chains;
1650 2036100 : if (earlyclobber)
1651 82 : scan_rtx (insn, loc, cl, terminate_write, OP_OUT);
1652 2036100 : scan_rtx (insn, loc, cl, mark_write, OP_OUT);
1653 :
1654 : /* ??? Many targets have output constraints on the SET_DEST
1655 : of a call insn, which is stupid, since these are certainly
1656 : ABI defined hard registers. For these, and for asm operands
1657 : that originally referenced hard registers, we must record that
1658 : the chain cannot be renamed. */
1659 2036100 : if (CALL_P (insn)
1660 2036100 : || (asm_noperands (PATTERN (insn)) > 0
1661 475 : && REG_P (op)
1662 267 : && REGNO (op) == ORIGINAL_REGNO (op)))
1663 : {
1664 0 : if (prev_open != open_chains)
1665 0 : open_chains->cannot_rename = 1;
1666 : }
1667 : }
1668 7244054 : cur_operand = NULL;
1669 7244054 : }
1670 :
1671 : /* Build def/use chain. */
1672 :
1673 : static bool
1674 578146 : build_def_use (basic_block bb)
1675 : {
1676 578146 : rtx_insn *insn;
1677 578146 : unsigned HOST_WIDE_INT untracked_operands;
1678 :
1679 578146 : fail_current_block = false;
1680 :
1681 5995138 : for (insn = BB_HEAD (bb); ; insn = NEXT_INSN (insn))
1682 : {
1683 5995138 : if (NONDEBUG_INSN_P (insn))
1684 : {
1685 3622027 : int n_ops;
1686 3622027 : rtx note;
1687 3622027 : rtx old_operands[MAX_RECOG_OPERANDS];
1688 3622027 : rtx old_dups[MAX_DUP_OPERANDS];
1689 3622027 : int i;
1690 3622027 : int predicated;
1691 3622027 : enum rtx_code set_code = SET;
1692 3622027 : enum rtx_code clobber_code = CLOBBER;
1693 3622027 : insn_rr_info *insn_info = NULL;
1694 3622027 : terminated_this_insn = NULL;
1695 :
1696 : /* Process the insn, determining its effect on the def-use
1697 : chains and live hard registers. We perform the following
1698 : steps with the register references in the insn, simulating
1699 : its effect:
1700 : (1) Deal with earlyclobber operands and CLOBBERs of non-operands
1701 : by creating chains and marking hard regs live.
1702 : (2) Any read outside an operand causes any chain it overlaps
1703 : with to be marked unrenamable.
1704 : (3) Any read inside an operand is added if there's already
1705 : an open chain for it.
1706 : (4) For any REG_DEAD note we find, close open chains that
1707 : overlap it.
1708 : (5) For any non-earlyclobber write we find, close open chains
1709 : that overlap it.
1710 : (6) For any non-earlyclobber write we find in an operand, make
1711 : a new chain or mark the hard register as live.
1712 : (7) For any REG_UNUSED, close any chains we just opened.
1713 : (8) For any REG_CFA_RESTORE or REG_CFA_REGISTER, kill any chain
1714 : containing its dest.
1715 :
1716 : We cannot deal with situations where we track a reg in one mode
1717 : and see a reference in another mode; these will cause the chain
1718 : to be marked unrenamable or even cause us to abort the entire
1719 : basic block. */
1720 :
1721 3622027 : extract_constrain_insn (insn);
1722 3622027 : preprocess_constraints (insn);
1723 3622027 : const operand_alternative *op_alt = which_op_alt ();
1724 3622027 : n_ops = recog_data.n_operands;
1725 3622027 : untracked_operands = 0;
1726 :
1727 3622027 : if (insn_rr.exists ())
1728 : {
1729 0 : insn_info = &insn_rr[INSN_UID (insn)];
1730 0 : insn_info->op_info = XOBNEWVEC (&rename_obstack, operand_rr_info,
1731 : recog_data.n_operands);
1732 0 : memset (insn_info->op_info, 0,
1733 0 : sizeof (operand_rr_info) * recog_data.n_operands);
1734 : }
1735 :
1736 : /* Simplify the code below by promoting OP_OUT to OP_INOUT in
1737 : predicated instructions, but only for register operands
1738 : that are already tracked, so that we can create a chain
1739 : when the first SET makes a register live. */
1740 :
1741 3622027 : predicated = GET_CODE (PATTERN (insn)) == COND_EXEC;
1742 11671049 : for (i = 0; i < n_ops; ++i)
1743 : {
1744 8049022 : rtx op = recog_data.operand[i];
1745 8049022 : int matches = op_alt[i].matches;
1746 8049022 : if (matches >= 0 || op_alt[i].matched >= 0
1747 6799082 : || (predicated && recog_data.operand_type[i] == OP_OUT))
1748 : {
1749 1249940 : recog_data.operand_type[i] = OP_INOUT;
1750 : /* A special case to deal with instruction patterns that
1751 : have matching operands with different modes. If we're
1752 : not already tracking such a reg, we won't start here,
1753 : and we must instead make sure to make the operand visible
1754 : to the machinery that tracks hard registers. */
1755 1249940 : machine_mode i_mode = recog_data.operand_mode[i];
1756 1249940 : if (matches >= 0)
1757 : {
1758 624970 : machine_mode matches_mode
1759 : = recog_data.operand_mode[matches];
1760 :
1761 624970 : if (maybe_ne (GET_MODE_SIZE (i_mode),
1762 624970 : GET_MODE_SIZE (matches_mode))
1763 624970 : && !verify_reg_in_set (op, &live_in_chains))
1764 : {
1765 191 : untracked_operands |= 1 << i;
1766 191 : untracked_operands |= 1 << matches;
1767 : }
1768 : }
1769 : }
1770 : #ifdef STACK_REGS
1771 8049022 : if (regstack_completed
1772 0 : && REG_P (op)
1773 8049022 : && IN_RANGE (REGNO (op), FIRST_STACK_REG, LAST_STACK_REG))
1774 0 : untracked_operands |= 1 << i;
1775 : #endif
1776 : /* If there's an in-out operand with a register that is not
1777 : being tracked at all yet, open a chain. */
1778 8049022 : if (recog_data.operand_type[i] == OP_INOUT
1779 1256617 : && !(untracked_operands & (1 << i))
1780 1256426 : && REG_P (op)
1781 9253386 : && !verify_reg_tracked (op))
1782 9 : create_new_chain (REGNO (op), REG_NREGS (op), NULL, NULL,
1783 : NO_REGS);
1784 : }
1785 :
1786 3622027 : if (fail_current_block)
1787 : break;
1788 :
1789 : /* Step 1a: Mark hard registers that are clobbered in this insn,
1790 : outside an operand, as live. */
1791 3622027 : hide_operands (n_ops, old_operands, old_dups, untracked_operands,
1792 : false);
1793 3622027 : note_stores (insn, note_sets_clobbers, &clobber_code);
1794 3622027 : restore_operands (insn, n_ops, old_operands, old_dups);
1795 :
1796 : /* Step 1b: Begin new chains for earlyclobbered writes inside
1797 : operands. */
1798 3622027 : record_out_operands (insn, true, insn_info);
1799 :
1800 : /* Step 2: Mark chains for which we have reads outside operands
1801 : as unrenamable.
1802 : We do this by munging all operands into PC, and closing
1803 : everything remaining. */
1804 :
1805 3622027 : hide_operands (n_ops, old_operands, old_dups, untracked_operands,
1806 : false);
1807 3622027 : scan_rtx (insn, &PATTERN (insn), NO_REGS, mark_all_read, OP_IN);
1808 3622027 : restore_operands (insn, n_ops, old_operands, old_dups);
1809 :
1810 : /* Step 2B: Can't rename function call argument registers. */
1811 3622027 : if (CALL_P (insn) && CALL_INSN_FUNCTION_USAGE (insn))
1812 131971 : scan_rtx (insn, &CALL_INSN_FUNCTION_USAGE (insn),
1813 : NO_REGS, mark_all_read, OP_IN);
1814 :
1815 : /* Step 2C: Can't rename asm operands that were originally
1816 : hard registers. */
1817 3622027 : if (asm_noperands (PATTERN (insn)) > 0)
1818 2714 : for (i = 0; i < n_ops; i++)
1819 : {
1820 1834 : rtx *loc = recog_data.operand_loc[i];
1821 1834 : rtx op = *loc;
1822 :
1823 1834 : if (REG_P (op)
1824 1305 : && REGNO (op) == ORIGINAL_REGNO (op)
1825 1835 : && (recog_data.operand_type[i] == OP_IN
1826 0 : || recog_data.operand_type[i] == OP_INOUT))
1827 1 : scan_rtx (insn, loc, NO_REGS, mark_all_read, OP_IN);
1828 : }
1829 :
1830 : /* Step 3: Append to chains for reads inside operands. */
1831 11760550 : for (i = 0; i < n_ops + recog_data.n_dups; i++)
1832 : {
1833 8138523 : int opn = i < n_ops ? i : recog_data.dup_num[i - n_ops];
1834 8049022 : rtx *loc = (i < n_ops
1835 8138523 : ? recog_data.operand_loc[opn]
1836 89501 : : recog_data.dup_loc[i - n_ops]);
1837 8138523 : enum reg_class cl = alternative_class (op_alt, opn);
1838 8138523 : enum op_type type = recog_data.operand_type[opn];
1839 :
1840 : /* Don't scan match_operand here, since we've no reg class
1841 : information to pass down. Any operands that we could
1842 : substitute in will be represented elsewhere. */
1843 8138523 : if (recog_data.constraints[opn][0] == '\0'
1844 6797327 : || untracked_operands & (1 << opn))
1845 1341578 : continue;
1846 :
1847 6796945 : if (insn_info)
1848 0 : cur_operand = i == opn ? insn_info->op_info + i : NULL;
1849 6796945 : if (op_alt[opn].is_address)
1850 201211 : scan_rtx_address (insn, loc, cl, mark_read,
1851 : VOIDmode, ADDR_SPACE_GENERIC);
1852 : else
1853 6595734 : scan_rtx (insn, loc, cl, mark_read, type);
1854 : }
1855 3622027 : cur_operand = NULL;
1856 :
1857 : /* Step 3B: Record updates for regs in REG_INC notes, and
1858 : source regs in REG_FRAME_RELATED_EXPR notes. */
1859 6662805 : for (note = REG_NOTES (insn); note; note = XEXP (note, 1))
1860 3040778 : if (REG_NOTE_KIND (note) == REG_INC
1861 3040778 : || REG_NOTE_KIND (note) == REG_FRAME_RELATED_EXPR)
1862 30 : scan_rtx (insn, &XEXP (note, 0), ALL_REGS, mark_read,
1863 : OP_INOUT);
1864 :
1865 : /* Step 4: Close chains for registers that die here, unless
1866 : the register is mentioned in a REG_UNUSED note. In that
1867 : case we keep the chain open until step #7 below to ensure
1868 : it conflicts with other output operands of this insn.
1869 : See PR 52573. Arguably the insn should not have both
1870 : notes; it has proven difficult to fix that without
1871 : other undesirable side effects. */
1872 6662805 : for (note = REG_NOTES (insn); note; note = XEXP (note, 1))
1873 3040778 : if (REG_NOTE_KIND (note) == REG_DEAD
1874 3040778 : && !find_regno_note (insn, REG_UNUSED, REGNO (XEXP (note, 0))))
1875 : {
1876 1563372 : remove_from_hard_reg_set (&live_hard_regs,
1877 1563372 : GET_MODE (XEXP (note, 0)),
1878 1563372 : REGNO (XEXP (note, 0)));
1879 1563372 : scan_rtx (insn, &XEXP (note, 0), NO_REGS, terminate_dead,
1880 : OP_IN);
1881 : }
1882 :
1883 : /* Step 4B: If this is a call, any chain live at this point
1884 : requires a caller-saved reg. */
1885 3622027 : if (CALL_P (insn))
1886 : {
1887 143717 : function_abi callee_abi = insn_callee_abi (insn);
1888 143717 : class du_head *p;
1889 420563 : for (p = open_chains; p; p = p->next_chain)
1890 : {
1891 276846 : p->call_abis |= (1 << callee_abi.id ());
1892 276846 : p->call_clobber_mask
1893 276846 : |= callee_abi.full_and_partial_reg_clobbers ();
1894 553692 : p->hard_conflicts |= callee_abi.full_reg_clobbers ();
1895 : }
1896 : }
1897 :
1898 : /* Step 5: Close open chains that overlap writes. Similar to
1899 : step 2, we hide in-out operands, since we do not want to
1900 : close these chains. We also hide earlyclobber operands,
1901 : since we've opened chains for them in step 1, and earlier
1902 : chains they would overlap with must have been closed at
1903 : the previous insn at the latest, as such operands cannot
1904 : possibly overlap with any input operands. */
1905 :
1906 3622027 : hide_operands (n_ops, old_operands, old_dups, untracked_operands,
1907 : true);
1908 3622027 : scan_rtx (insn, &PATTERN (insn), NO_REGS, terminate_write, OP_IN);
1909 3622027 : restore_operands (insn, n_ops, old_operands, old_dups);
1910 :
1911 : /* Step 6a: Mark hard registers that are set in this insn,
1912 : outside an operand, as live. */
1913 3622027 : hide_operands (n_ops, old_operands, old_dups, untracked_operands,
1914 : false);
1915 3622027 : note_stores (insn, note_sets_clobbers, &set_code);
1916 3622027 : restore_operands (insn, n_ops, old_operands, old_dups);
1917 :
1918 : /* Step 6b: Begin new chains for writes inside operands. */
1919 3622027 : record_out_operands (insn, false, insn_info);
1920 :
1921 : /* Step 6c: Record destination regs in REG_FRAME_RELATED_EXPR
1922 : notes for update. */
1923 6662805 : for (note = REG_NOTES (insn); note; note = XEXP (note, 1))
1924 3040778 : if (REG_NOTE_KIND (note) == REG_FRAME_RELATED_EXPR)
1925 30 : scan_rtx (insn, &XEXP (note, 0), ALL_REGS, mark_access,
1926 : OP_INOUT);
1927 :
1928 : /* Step 7: Close chains for registers that were never
1929 : really used here. */
1930 6662805 : for (note = REG_NOTES (insn); note; note = XEXP (note, 1))
1931 3040778 : if (REG_NOTE_KIND (note) == REG_UNUSED)
1932 : {
1933 555278 : remove_from_hard_reg_set (&live_hard_regs,
1934 555278 : GET_MODE (XEXP (note, 0)),
1935 555278 : REGNO (XEXP (note, 0)));
1936 555278 : scan_rtx (insn, &XEXP (note, 0), NO_REGS, terminate_dead,
1937 : OP_IN);
1938 : }
1939 :
1940 : /* Step 8: Kill the chains involving register restores. Those
1941 : should restore _that_ register. Similar for REG_CFA_REGISTER. */
1942 6662805 : for (note = REG_NOTES (insn); note; note = XEXP (note, 1))
1943 3040778 : if (REG_NOTE_KIND (note) == REG_CFA_RESTORE
1944 3035209 : || REG_NOTE_KIND (note) == REG_CFA_REGISTER)
1945 : {
1946 5569 : rtx *x = &XEXP (note, 0);
1947 5569 : if (!*x)
1948 0 : x = &PATTERN (insn);
1949 5569 : if (GET_CODE (*x) == PARALLEL)
1950 0 : x = &XVECEXP (*x, 0, 0);
1951 5569 : if (GET_CODE (*x) == SET)
1952 0 : x = &SET_DEST (*x);
1953 5569 : scan_rtx (insn, x, NO_REGS, mark_all_read, OP_IN);
1954 : }
1955 : }
1956 950874 : else if (DEBUG_BIND_INSN_P (insn)
1957 3021518 : && !VAR_LOC_UNKNOWN_P (INSN_VAR_LOCATION_LOC (insn)))
1958 : {
1959 428609 : scan_rtx (insn, &INSN_VAR_LOCATION_LOC (insn),
1960 : ALL_REGS, mark_read, OP_IN);
1961 : }
1962 5995138 : if (insn == BB_END (bb))
1963 : break;
1964 5416992 : }
1965 :
1966 578146 : if (fail_current_block)
1967 0 : return false;
1968 :
1969 : return true;
1970 : }
1971 :
1972 : /* Initialize the register renamer. If INSN_INFO is true, ensure that
1973 : insn_rr is nonnull. */
1974 : void
1975 22497 : regrename_init (bool insn_info)
1976 : {
1977 22497 : gcc_obstack_init (&rename_obstack);
1978 22497 : insn_rr.create (0);
1979 22497 : if (insn_info)
1980 0 : insn_rr.safe_grow_cleared (get_max_uid (), true);
1981 22497 : }
1982 :
1983 : /* Free all global data used by the register renamer. */
1984 : void
1985 22497 : regrename_finish (void)
1986 : {
1987 22497 : insn_rr.release ();
1988 22497 : free_chain_data ();
1989 22497 : obstack_free (&rename_obstack, NULL);
1990 22497 : }
1991 :
1992 : /* Perform register renaming on the current function. */
1993 :
1994 : static unsigned int
1995 22497 : regrename_optimize (void)
1996 : {
1997 22497 : df_set_flags (DF_LR_RUN_DCE);
1998 22497 : df_note_add_problem ();
1999 22497 : df_analyze ();
2000 22497 : df_set_flags (DF_DEFER_INSN_RESCAN);
2001 :
2002 22497 : regrename_init (false);
2003 :
2004 22497 : regrename_analyze (NULL, false);
2005 :
2006 22497 : rename_chains ();
2007 :
2008 22497 : regrename_finish ();
2009 :
2010 22497 : return 0;
2011 : }
2012 :
2013 : namespace {
2014 :
2015 : const pass_data pass_data_regrename =
2016 : {
2017 : RTL_PASS, /* type */
2018 : "rnreg", /* name */
2019 : OPTGROUP_NONE, /* optinfo_flags */
2020 : TV_RENAME_REGISTERS, /* tv_id */
2021 : 0, /* properties_required */
2022 : 0, /* properties_provided */
2023 : 0, /* properties_destroyed */
2024 : 0, /* todo_flags_start */
2025 : TODO_df_finish, /* todo_flags_finish */
2026 : };
2027 :
2028 : class pass_regrename : public rtl_opt_pass
2029 : {
2030 : public:
2031 285722 : pass_regrename (gcc::context *ctxt)
2032 571444 : : rtl_opt_pass (pass_data_regrename, ctxt)
2033 : {}
2034 :
2035 : /* opt_pass methods: */
2036 1471370 : bool gate (function *) final override
2037 : {
2038 1471370 : return (optimize > 0 && (flag_rename_registers));
2039 : }
2040 :
2041 22497 : unsigned int execute (function *) final override
2042 : {
2043 22497 : return regrename_optimize ();
2044 : }
2045 :
2046 : }; // class pass_regrename
2047 :
2048 : } // anon namespace
2049 :
2050 : rtl_opt_pass *
2051 285722 : make_pass_regrename (gcc::context *ctxt)
2052 : {
2053 285722 : return new pass_regrename (ctxt);
2054 : }
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