1 | /* LRA (local register allocator) driver and LRA utilities. |
2 | Copyright (C) 2010-2024 Free Software Foundation, Inc. |
3 | Contributed by Vladimir Makarov <vmakarov@redhat.com>. |
4 | |
5 | This file is part of GCC. |
6 | |
7 | GCC is free software; you can redistribute it and/or modify it under |
8 | the terms of the GNU General Public License as published by the Free |
9 | Software Foundation; either version 3, or (at your option) any later |
10 | version. |
11 | |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
15 | for more details. |
16 | |
17 | You should have received a copy of the GNU General Public License |
18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ |
20 | |
21 | |
22 | /* The Local Register Allocator (LRA) is a replacement of former |
23 | reload pass. It is focused to simplify code solving the reload |
24 | pass tasks, to make the code maintenance easier, and to implement new |
25 | perspective optimizations. |
26 | |
27 | The major LRA design solutions are: |
28 | o division small manageable, separated sub-tasks |
29 | o reflection of all transformations and decisions in RTL as more |
30 | as possible |
31 | o insn constraints as a primary source of the info (minimizing |
32 | number of target-depended macros/hooks) |
33 | |
34 | In brief LRA works by iterative insn process with the final goal is |
35 | to satisfy all insn and address constraints: |
36 | o New reload insns (in brief reloads) and reload pseudos might be |
37 | generated; |
38 | o Some pseudos might be spilled to assign hard registers to |
39 | new reload pseudos; |
40 | o Recalculating spilled pseudo values (rematerialization); |
41 | o Changing spilled pseudos to stack memory or their equivalences; |
42 | o Allocation stack memory changes the address displacement and |
43 | new iteration is needed. |
44 | |
45 | Here is block diagram of LRA passes: |
46 | |
47 | ------------------------ |
48 | --------------- | Undo inheritance for | --------------- |
49 | | Memory-memory | | spilled pseudos, | | New (and old) | |
50 | | move coalesce |<---| splits for pseudos got |<-- | pseudos | |
51 | --------------- | the same hard regs, | | assignment | |
52 | Start | | and optional reloads | --------------- |
53 | | | ------------------------ ^ |
54 | V | ---------------- | |
55 | ----------- V | Update virtual | | |
56 | | Remove |----> ------------>| register | | |
57 | | scratches | ^ | displacements | | |
58 | ----------- | ---------------- | |
59 | | | | |
60 | | V New | |
61 | | ------------ pseudos ------------------- |
62 | | |Constraints:| or insns | Inheritance/split | |
63 | | | RTL |--------->| transformations | |
64 | | | transfor- | | in EBB scope | |
65 | | substi- | mations | ------------------- |
66 | | tutions ------------ |
67 | | | No change |
68 | ---------------- V |
69 | | Spilled pseudo | ------------------- |
70 | | to memory |<----| Rematerialization | |
71 | | substitution | ------------------- |
72 | ---------------- |
73 | | No susbtitions |
74 | V |
75 | ------------------------- |
76 | | Hard regs substitution, | |
77 | | devirtalization, and |------> Finish |
78 | | restoring scratches got | |
79 | | memory | |
80 | ------------------------- |
81 | |
82 | To speed up the process: |
83 | o We process only insns affected by changes on previous |
84 | iterations; |
85 | o We don't use DFA-infrastructure because it results in much slower |
86 | compiler speed than a special IR described below does; |
87 | o We use a special insn representation for quick access to insn |
88 | info which is always *synchronized* with the current RTL; |
89 | o Insn IR is minimized by memory. It is divided on three parts: |
90 | o one specific for each insn in RTL (only operand locations); |
91 | o one common for all insns in RTL with the same insn code |
92 | (different operand attributes from machine descriptions); |
93 | o one oriented for maintenance of live info (list of pseudos). |
94 | o Pseudo data: |
95 | o all insns where the pseudo is referenced; |
96 | o live info (conflicting hard regs, live ranges, # of |
97 | references etc); |
98 | o data used for assigning (preferred hard regs, costs etc). |
99 | |
100 | This file contains LRA driver, LRA utility functions and data, and |
101 | code for dealing with scratches. */ |
102 | |
103 | #include "config.h" |
104 | #include "system.h" |
105 | #include "coretypes.h" |
106 | #include "backend.h" |
107 | #include "target.h" |
108 | #include "rtl.h" |
109 | #include "rtl-error.h" |
110 | #include "tree.h" |
111 | #include "predict.h" |
112 | #include "df.h" |
113 | #include "memmodel.h" |
114 | #include "tm_p.h" |
115 | #include "optabs.h" |
116 | #include "regs.h" |
117 | #include "ira.h" |
118 | #include "recog.h" |
119 | #include "expr.h" |
120 | #include "cfgrtl.h" |
121 | #include "cfgbuild.h" |
122 | #include "lra.h" |
123 | #include "lra-int.h" |
124 | #include "print-rtl.h" |
125 | #include "function-abi.h" |
126 | |
127 | /* Dump bitmap SET with TITLE and BB INDEX. */ |
128 | void |
129 | lra_dump_bitmap_with_title (const char *title, bitmap set, int index) |
130 | { |
131 | unsigned int i; |
132 | int count; |
133 | bitmap_iterator bi; |
134 | static const int max_nums_on_line = 10; |
135 | |
136 | if (bitmap_empty_p (map: set)) |
137 | return; |
138 | fprintf (stream: lra_dump_file, format: " %s %d:" , title, index); |
139 | fprintf (stream: lra_dump_file, format: "\n" ); |
140 | count = max_nums_on_line + 1; |
141 | EXECUTE_IF_SET_IN_BITMAP (set, 0, i, bi) |
142 | { |
143 | if (count > max_nums_on_line) |
144 | { |
145 | fprintf (stream: lra_dump_file, format: "\n " ); |
146 | count = 0; |
147 | } |
148 | fprintf (stream: lra_dump_file, format: " %4u" , i); |
149 | count++; |
150 | } |
151 | fprintf (stream: lra_dump_file, format: "\n" ); |
152 | } |
153 | |
154 | /* Hard registers currently not available for allocation. It can |
155 | changed after some hard registers become not eliminable. */ |
156 | HARD_REG_SET lra_no_alloc_regs; |
157 | |
158 | static int get_new_reg_value (void); |
159 | static void expand_reg_info (void); |
160 | static void invalidate_insn_recog_data (int); |
161 | static int get_insn_freq (rtx_insn *); |
162 | static void invalidate_insn_data_regno_info (lra_insn_recog_data_t, |
163 | rtx_insn *, int); |
164 | /* Expand all regno related info needed for LRA. */ |
165 | static void |
166 | expand_reg_data (int old) |
167 | { |
168 | resize_reg_info (); |
169 | expand_reg_info (); |
170 | ira_expand_reg_equiv (); |
171 | for (int i = (int) max_reg_num () - 1; i >= old; i--) |
172 | lra_change_class (regno: i, new_class: ALL_REGS, title: " Set" , nl_p: true); |
173 | } |
174 | |
175 | /* Create and return a new reg of ORIGINAL mode. If ORIGINAL is NULL |
176 | or of VOIDmode, use MD_MODE for the new reg. Initialize its |
177 | register class to RCLASS. Print message about assigning class |
178 | RCLASS containing new register name TITLE unless it is NULL. Use |
179 | attributes of ORIGINAL if it is a register. The created register |
180 | will have unique held value. */ |
181 | rtx |
182 | lra_create_new_reg_with_unique_value (machine_mode md_mode, rtx original, |
183 | enum reg_class rclass, |
184 | HARD_REG_SET *exclude_start_hard_regs, |
185 | const char *title) |
186 | { |
187 | machine_mode mode; |
188 | rtx new_reg; |
189 | |
190 | if (original == NULL_RTX || (mode = GET_MODE (original)) == VOIDmode) |
191 | mode = md_mode; |
192 | lra_assert (mode != VOIDmode); |
193 | new_reg = gen_reg_rtx (mode); |
194 | if (original == NULL_RTX || ! REG_P (original)) |
195 | { |
196 | if (lra_dump_file != NULL) |
197 | fprintf (stream: lra_dump_file, format: " Creating newreg=%i" , REGNO (new_reg)); |
198 | } |
199 | else |
200 | { |
201 | if (ORIGINAL_REGNO (original) >= FIRST_PSEUDO_REGISTER) |
202 | ORIGINAL_REGNO (new_reg) = ORIGINAL_REGNO (original); |
203 | REG_USERVAR_P (new_reg) = REG_USERVAR_P (original); |
204 | REG_POINTER (new_reg) = REG_POINTER (original); |
205 | REG_ATTRS (new_reg) = REG_ATTRS (original); |
206 | if (lra_dump_file != NULL) |
207 | fprintf (stream: lra_dump_file, format: " Creating newreg=%i from oldreg=%i" , |
208 | REGNO (new_reg), REGNO (original)); |
209 | } |
210 | if (lra_dump_file != NULL) |
211 | { |
212 | if (title != NULL) |
213 | fprintf (stream: lra_dump_file, format: ", assigning class %s to%s%s r%d" , |
214 | reg_class_names[rclass], *title == '\0' ? "" : " " , |
215 | title, REGNO (new_reg)); |
216 | fprintf (stream: lra_dump_file, format: "\n" ); |
217 | } |
218 | expand_reg_data (old: max_reg_num ()); |
219 | setup_reg_classes (REGNO (new_reg), rclass, NO_REGS, rclass); |
220 | if (exclude_start_hard_regs != NULL) |
221 | lra_reg_info[REGNO (new_reg)].exclude_start_hard_regs |
222 | = *exclude_start_hard_regs; |
223 | return new_reg; |
224 | } |
225 | |
226 | /* Analogous to the previous function but also inherits value of |
227 | ORIGINAL. */ |
228 | rtx |
229 | lra_create_new_reg (machine_mode md_mode, rtx original, enum reg_class rclass, |
230 | HARD_REG_SET *exclude_start_hard_regs, const char *title) |
231 | { |
232 | rtx new_reg; |
233 | |
234 | new_reg |
235 | = lra_create_new_reg_with_unique_value (md_mode, original, rclass, |
236 | exclude_start_hard_regs, title); |
237 | if (original != NULL_RTX && REG_P (original)) |
238 | lra_assign_reg_val (REGNO (original), REGNO (new_reg)); |
239 | return new_reg; |
240 | } |
241 | |
242 | /* Set up for REGNO unique hold value. */ |
243 | void |
244 | lra_set_regno_unique_value (int regno) |
245 | { |
246 | lra_reg_info[regno].val = get_new_reg_value (); |
247 | } |
248 | |
249 | /* Invalidate INSN related info used by LRA. The info should never be |
250 | used after that. */ |
251 | void |
252 | lra_invalidate_insn_data (rtx_insn *insn) |
253 | { |
254 | lra_invalidate_insn_regno_info (insn); |
255 | invalidate_insn_recog_data (INSN_UID (insn)); |
256 | } |
257 | |
258 | /* Mark INSN deleted and invalidate the insn related info used by |
259 | LRA. */ |
260 | void |
261 | lra_set_insn_deleted (rtx_insn *insn) |
262 | { |
263 | lra_invalidate_insn_data (insn); |
264 | SET_INSN_DELETED (insn); |
265 | } |
266 | |
267 | /* Delete an unneeded INSN and any previous insns who sole purpose is |
268 | loading data that is dead in INSN. */ |
269 | void |
270 | lra_delete_dead_insn (rtx_insn *insn) |
271 | { |
272 | rtx_insn *prev = prev_real_insn (insn); |
273 | rtx prev_dest; |
274 | |
275 | /* If the previous insn sets a register that dies in our insn, |
276 | delete it too. */ |
277 | if (prev && GET_CODE (PATTERN (prev)) == SET |
278 | && (prev_dest = SET_DEST (PATTERN (prev)), REG_P (prev_dest)) |
279 | && reg_mentioned_p (prev_dest, PATTERN (insn)) |
280 | && find_regno_note (insn, REG_DEAD, REGNO (prev_dest)) |
281 | && ! side_effects_p (SET_SRC (PATTERN (prev)))) |
282 | lra_delete_dead_insn (insn: prev); |
283 | |
284 | lra_set_insn_deleted (insn); |
285 | } |
286 | |
287 | /* Emit insn x = y + z. Return NULL if we failed to do it. |
288 | Otherwise, return the insn. We don't use gen_add3_insn as it might |
289 | clobber CC. */ |
290 | static rtx_insn * |
291 | emit_add3_insn (rtx x, rtx y, rtx z) |
292 | { |
293 | rtx_insn *last; |
294 | |
295 | last = get_last_insn (); |
296 | |
297 | if (have_addptr3_insn (x, y, z)) |
298 | { |
299 | rtx_insn *insn = gen_addptr3_insn (x, y, z); |
300 | |
301 | /* If the target provides an "addptr" pattern it hopefully does |
302 | for a reason. So falling back to the normal add would be |
303 | a bug. */ |
304 | lra_assert (insn != NULL_RTX); |
305 | emit_insn (insn); |
306 | return insn; |
307 | } |
308 | |
309 | rtx_insn *insn = emit_insn (gen_rtx_SET (x, gen_rtx_PLUS (GET_MODE (y), |
310 | y, z))); |
311 | if (recog_memoized (insn) < 0) |
312 | { |
313 | delete_insns_since (last); |
314 | insn = NULL; |
315 | } |
316 | return insn; |
317 | } |
318 | |
319 | /* Emit insn x = x + y. Return the insn. We use gen_add2_insn as the |
320 | last resort. */ |
321 | static rtx_insn * |
322 | emit_add2_insn (rtx x, rtx y) |
323 | { |
324 | rtx_insn *insn = emit_add3_insn (x, y: x, z: y); |
325 | if (insn == NULL_RTX) |
326 | { |
327 | insn = gen_add2_insn (x, y); |
328 | if (insn != NULL_RTX) |
329 | emit_insn (insn); |
330 | } |
331 | return insn; |
332 | } |
333 | |
334 | /* Target checks operands through operand predicates to recognize an |
335 | insn. We should have a special precaution to generate add insns |
336 | which are frequent results of elimination. |
337 | |
338 | Emit insns for x = y + z. X can be used to store intermediate |
339 | values and should be not in Y and Z when we use X to store an |
340 | intermediate value. Y + Z should form [base] [+ index[ * scale]] [ |
341 | + disp] where base and index are registers, disp and scale are |
342 | constants. Y should contain base if it is present, Z should |
343 | contain disp if any. index[*scale] can be part of Y or Z. */ |
344 | void |
345 | lra_emit_add (rtx x, rtx y, rtx z) |
346 | { |
347 | int old; |
348 | rtx_insn *last; |
349 | rtx a1, a2, base, index, disp, scale, index_scale; |
350 | bool ok_p; |
351 | |
352 | rtx_insn *add3_insn = emit_add3_insn (x, y, z); |
353 | old = max_reg_num (); |
354 | if (add3_insn != NULL) |
355 | ; |
356 | else |
357 | { |
358 | disp = a2 = NULL_RTX; |
359 | if (GET_CODE (y) == PLUS) |
360 | { |
361 | a1 = XEXP (y, 0); |
362 | a2 = XEXP (y, 1); |
363 | disp = z; |
364 | } |
365 | else |
366 | { |
367 | a1 = y; |
368 | if (CONSTANT_P (z)) |
369 | disp = z; |
370 | else |
371 | a2 = z; |
372 | } |
373 | index_scale = scale = NULL_RTX; |
374 | if (GET_CODE (a1) == MULT) |
375 | { |
376 | index_scale = a1; |
377 | index = XEXP (a1, 0); |
378 | scale = XEXP (a1, 1); |
379 | base = a2; |
380 | } |
381 | else if (a2 != NULL_RTX && GET_CODE (a2) == MULT) |
382 | { |
383 | index_scale = a2; |
384 | index = XEXP (a2, 0); |
385 | scale = XEXP (a2, 1); |
386 | base = a1; |
387 | } |
388 | else |
389 | { |
390 | base = a1; |
391 | index = a2; |
392 | } |
393 | if ((base != NULL_RTX && ! (REG_P (base) || GET_CODE (base) == SUBREG)) |
394 | || (index != NULL_RTX |
395 | && ! (REG_P (index) || GET_CODE (index) == SUBREG)) |
396 | || (disp != NULL_RTX && ! CONSTANT_P (disp)) |
397 | || (scale != NULL_RTX && ! CONSTANT_P (scale))) |
398 | { |
399 | /* Probably we have no 3 op add. Last chance is to use 2-op |
400 | add insn. To succeed, don't move Z to X as an address |
401 | segment always comes in Y. Otherwise, we might fail when |
402 | adding the address segment to register. */ |
403 | lra_assert (x != y && x != z); |
404 | emit_move_insn (x, y); |
405 | rtx_insn *insn = emit_add2_insn (x, y: z); |
406 | lra_assert (insn != NULL_RTX); |
407 | } |
408 | else |
409 | { |
410 | if (index_scale == NULL_RTX) |
411 | index_scale = index; |
412 | if (disp == NULL_RTX) |
413 | { |
414 | /* Generate x = index_scale; x = x + base. */ |
415 | lra_assert (index_scale != NULL_RTX && base != NULL_RTX); |
416 | emit_move_insn (x, index_scale); |
417 | rtx_insn *insn = emit_add2_insn (x, y: base); |
418 | lra_assert (insn != NULL_RTX); |
419 | } |
420 | else if (scale == NULL_RTX) |
421 | { |
422 | /* Try x = base + disp. */ |
423 | lra_assert (base != NULL_RTX); |
424 | last = get_last_insn (); |
425 | rtx_insn *move_insn = |
426 | emit_move_insn (x, gen_rtx_PLUS (GET_MODE (base), base, disp)); |
427 | if (recog_memoized (insn: move_insn) < 0) |
428 | { |
429 | delete_insns_since (last); |
430 | /* Generate x = disp; x = x + base. */ |
431 | emit_move_insn (x, disp); |
432 | rtx_insn *add2_insn = emit_add2_insn (x, y: base); |
433 | lra_assert (add2_insn != NULL_RTX); |
434 | } |
435 | /* Generate x = x + index. */ |
436 | if (index != NULL_RTX) |
437 | { |
438 | rtx_insn *insn = emit_add2_insn (x, y: index); |
439 | lra_assert (insn != NULL_RTX); |
440 | } |
441 | } |
442 | else |
443 | { |
444 | /* Try x = index_scale; x = x + disp; x = x + base. */ |
445 | last = get_last_insn (); |
446 | rtx_insn *move_insn = emit_move_insn (x, index_scale); |
447 | ok_p = false; |
448 | if (recog_memoized (insn: move_insn) >= 0) |
449 | { |
450 | rtx_insn *insn = emit_add2_insn (x, y: disp); |
451 | if (insn != NULL_RTX) |
452 | { |
453 | if (base == NULL_RTX) |
454 | ok_p = true; |
455 | else |
456 | { |
457 | insn = emit_add2_insn (x, y: base); |
458 | if (insn != NULL_RTX) |
459 | ok_p = true; |
460 | } |
461 | } |
462 | } |
463 | if (! ok_p) |
464 | { |
465 | rtx_insn *insn; |
466 | |
467 | delete_insns_since (last); |
468 | /* Generate x = disp; x = x + base; x = x + index_scale. */ |
469 | emit_move_insn (x, disp); |
470 | if (base != NULL_RTX) |
471 | { |
472 | insn = emit_add2_insn (x, y: base); |
473 | lra_assert (insn != NULL_RTX); |
474 | } |
475 | insn = emit_add2_insn (x, y: index_scale); |
476 | lra_assert (insn != NULL_RTX); |
477 | } |
478 | } |
479 | } |
480 | } |
481 | /* Functions emit_... can create pseudos -- so expand the pseudo |
482 | data. */ |
483 | if (old != max_reg_num ()) |
484 | expand_reg_data (old); |
485 | } |
486 | |
487 | /* The number of emitted reload insns so far. */ |
488 | int lra_curr_reload_num; |
489 | |
490 | static void remove_insn_scratches (rtx_insn *insn); |
491 | |
492 | /* Emit x := y, processing special case when y = u + v or y = u + v * |
493 | scale + w through emit_add (Y can be an address which is base + |
494 | index reg * scale + displacement in general case). X may be used |
495 | as intermediate result therefore it should be not in Y. */ |
496 | void |
497 | lra_emit_move (rtx x, rtx y) |
498 | { |
499 | int old; |
500 | rtx_insn *insn; |
501 | |
502 | if (GET_CODE (y) != PLUS) |
503 | { |
504 | if (rtx_equal_p (x, y)) |
505 | return; |
506 | old = max_reg_num (); |
507 | |
508 | insn = (GET_CODE (x) != STRICT_LOW_PART |
509 | ? emit_move_insn (x, y) : emit_insn (gen_rtx_SET (x, y))); |
510 | /* The move pattern may require scratch registers, so convert them |
511 | into real registers now. */ |
512 | if (insn != NULL_RTX) |
513 | remove_insn_scratches (insn); |
514 | if (REG_P (x)) |
515 | lra_reg_info[ORIGINAL_REGNO (x)].last_reload = ++lra_curr_reload_num; |
516 | /* Function emit_move can create pseudos -- so expand the pseudo |
517 | data. */ |
518 | if (old != max_reg_num ()) |
519 | expand_reg_data (old); |
520 | return; |
521 | } |
522 | lra_emit_add (x, XEXP (y, 0), XEXP (y, 1)); |
523 | } |
524 | |
525 | /* Update insn operands which are duplication of operands whose |
526 | numbers are in array of NOPS (with end marker -1). The insn is |
527 | represented by its LRA internal representation ID. */ |
528 | void |
529 | lra_update_dups (lra_insn_recog_data_t id, signed char *nops) |
530 | { |
531 | int i, j, nop; |
532 | struct lra_static_insn_data *static_id = id->insn_static_data; |
533 | |
534 | for (i = 0; i < static_id->n_dups; i++) |
535 | for (j = 0; (nop = nops[j]) >= 0; j++) |
536 | if (static_id->dup_num[i] == nop) |
537 | *id->dup_loc[i] = *id->operand_loc[nop]; |
538 | } |
539 | |
540 | /* Report asm insn error and modify the asm insn. */ |
541 | void |
542 | lra_asm_insn_error (rtx_insn *insn) |
543 | { |
544 | lra_asm_error_p = true; |
545 | error_for_asm (insn, |
546 | "%<asm%> operand has impossible constraints" |
547 | " or there are not enough registers" ); |
548 | /* Avoid further trouble with this insn. */ |
549 | if (JUMP_P (insn)) |
550 | { |
551 | ira_nullify_asm_goto (insn); |
552 | lra_update_insn_regno_info (insn); |
553 | } |
554 | else |
555 | { |
556 | PATTERN (insn) = gen_rtx_USE (VOIDmode, const0_rtx); |
557 | lra_set_insn_deleted (insn); |
558 | } |
559 | } |
560 | |
561 | |
562 | |
563 | /* This page contains code dealing with info about registers in the |
564 | insns. */ |
565 | |
566 | /* Pools for insn reg info. */ |
567 | object_allocator<lra_insn_reg> lra_insn_reg_pool ("insn regs" ); |
568 | |
569 | /* Create LRA insn related info about a reference to REGNO in INSN |
570 | with TYPE (in/out/inout), biggest reference mode MODE, flag that it |
571 | is reference through subreg (SUBREG_P), and reference to the next |
572 | insn reg info (NEXT). If REGNO can be early clobbered, |
573 | alternatives in which it can be early clobbered are given by |
574 | EARLY_CLOBBER_ALTS. */ |
575 | static struct lra_insn_reg * |
576 | new_insn_reg (rtx_insn *insn, int regno, enum op_type type, |
577 | machine_mode mode, bool subreg_p, |
578 | alternative_mask early_clobber_alts, |
579 | struct lra_insn_reg *next) |
580 | { |
581 | lra_insn_reg *ir = lra_insn_reg_pool.allocate (); |
582 | ir->type = type; |
583 | ir->biggest_mode = mode; |
584 | if (NONDEBUG_INSN_P (insn)) |
585 | lra_update_biggest_mode (regno, mode); |
586 | ir->subreg_p = subreg_p; |
587 | ir->early_clobber_alts = early_clobber_alts; |
588 | ir->regno = regno; |
589 | ir->next = next; |
590 | return ir; |
591 | } |
592 | |
593 | /* Free insn reg info list IR. */ |
594 | static void |
595 | free_insn_regs (struct lra_insn_reg *ir) |
596 | { |
597 | struct lra_insn_reg *next_ir; |
598 | |
599 | for (; ir != NULL; ir = next_ir) |
600 | { |
601 | next_ir = ir->next; |
602 | lra_insn_reg_pool.remove (object: ir); |
603 | } |
604 | } |
605 | |
606 | /* Finish pool for insn reg info. */ |
607 | static void |
608 | finish_insn_regs (void) |
609 | { |
610 | lra_insn_reg_pool.release (); |
611 | } |
612 | |
613 | |
614 | |
615 | /* This page contains code dealing LRA insn info (or in other words |
616 | LRA internal insn representation). */ |
617 | |
618 | /* Map INSN_CODE -> the static insn data. This info is valid during |
619 | all translation unit. */ |
620 | struct lra_static_insn_data *insn_code_data[NUM_INSN_CODES]; |
621 | |
622 | /* Debug insns are represented as a special insn with one input |
623 | operand which is RTL expression in var_location. */ |
624 | |
625 | /* The following data are used as static insn operand data for all |
626 | debug insns. If structure lra_operand_data is changed, the |
627 | initializer should be changed too. */ |
628 | static struct lra_operand_data debug_operand_data = |
629 | { |
630 | NULL, /* alternative */ |
631 | .early_clobber_alts: 0, /* early_clobber_alts */ |
632 | .mode: E_VOIDmode, /* We are not interesting in the operand mode. */ |
633 | .type: OP_IN, |
634 | .strict_low: 0, .is_operator: 0, .is_address: 0 |
635 | }; |
636 | |
637 | /* The following data are used as static insn data for all debug |
638 | bind insns. If structure lra_static_insn_data is changed, the |
639 | initializer should be changed too. */ |
640 | static struct lra_static_insn_data debug_bind_static_data = |
641 | { |
642 | .operand: &debug_operand_data, |
643 | .dup_num: 0, /* Duplication operands #. */ |
644 | .commutative: -1, /* Commutative operand #. */ |
645 | .n_operands: 1, /* Operands #. There is only one operand which is debug RTL |
646 | expression. */ |
647 | .n_dups: 0, /* Duplications #. */ |
648 | .n_alternatives: 0, /* Alternatives #. We are not interesting in alternatives |
649 | because we does not proceed debug_insns for reloads. */ |
650 | NULL, /* Hard registers referenced in machine description. */ |
651 | NULL /* Descriptions of operands in alternatives. */ |
652 | }; |
653 | |
654 | /* The following data are used as static insn data for all debug |
655 | marker insns. If structure lra_static_insn_data is changed, the |
656 | initializer should be changed too. */ |
657 | static struct lra_static_insn_data debug_marker_static_data = |
658 | { |
659 | .operand: &debug_operand_data, |
660 | .dup_num: 0, /* Duplication operands #. */ |
661 | .commutative: -1, /* Commutative operand #. */ |
662 | .n_operands: 0, /* Operands #. There isn't any operand. */ |
663 | .n_dups: 0, /* Duplications #. */ |
664 | .n_alternatives: 0, /* Alternatives #. We are not interesting in alternatives |
665 | because we does not proceed debug_insns for reloads. */ |
666 | NULL, /* Hard registers referenced in machine description. */ |
667 | NULL /* Descriptions of operands in alternatives. */ |
668 | }; |
669 | |
670 | /* Called once per compiler work to initialize some LRA data related |
671 | to insns. */ |
672 | static void |
673 | init_insn_code_data_once (void) |
674 | { |
675 | memset (s: insn_code_data, c: 0, n: sizeof (insn_code_data)); |
676 | } |
677 | |
678 | /* Called once per compiler work to finalize some LRA data related to |
679 | insns. */ |
680 | static void |
681 | finish_insn_code_data_once (void) |
682 | { |
683 | for (unsigned int i = 0; i < NUM_INSN_CODES; i++) |
684 | { |
685 | if (insn_code_data[i] != NULL) |
686 | { |
687 | free (ptr: insn_code_data[i]); |
688 | insn_code_data[i] = NULL; |
689 | } |
690 | } |
691 | } |
692 | |
693 | /* Return static insn data, allocate and setup if necessary. Although |
694 | dup_num is static data (it depends only on icode), to set it up we |
695 | need to extract insn first. So recog_data should be valid for |
696 | normal insn (ICODE >= 0) before the call. */ |
697 | static struct lra_static_insn_data * |
698 | get_static_insn_data (int icode, int nop, int ndup, int nalt) |
699 | { |
700 | struct lra_static_insn_data *data; |
701 | size_t n_bytes; |
702 | |
703 | lra_assert (icode < (int) NUM_INSN_CODES); |
704 | if (icode >= 0 && (data = insn_code_data[icode]) != NULL) |
705 | return data; |
706 | lra_assert (nop >= 0 && ndup >= 0 && nalt >= 0); |
707 | n_bytes = sizeof (struct lra_static_insn_data) |
708 | + sizeof (struct lra_operand_data) * nop |
709 | + sizeof (int) * ndup; |
710 | data = XNEWVAR (struct lra_static_insn_data, n_bytes); |
711 | data->operand_alternative = NULL; |
712 | data->n_operands = nop; |
713 | data->n_dups = ndup; |
714 | data->n_alternatives = nalt; |
715 | data->operand = ((struct lra_operand_data *) |
716 | ((char *) data + sizeof (struct lra_static_insn_data))); |
717 | data->dup_num = ((int *) ((char *) data->operand |
718 | + sizeof (struct lra_operand_data) * nop)); |
719 | if (icode >= 0) |
720 | { |
721 | int i; |
722 | |
723 | insn_code_data[icode] = data; |
724 | for (i = 0; i < nop; i++) |
725 | { |
726 | data->operand[i].constraint |
727 | = insn_data[icode].operand[i].constraint; |
728 | data->operand[i].mode = insn_data[icode].operand[i].mode; |
729 | data->operand[i].strict_low = insn_data[icode].operand[i].strict_low; |
730 | data->operand[i].is_operator |
731 | = insn_data[icode].operand[i].is_operator; |
732 | data->operand[i].type |
733 | = (data->operand[i].constraint[0] == '=' ? OP_OUT |
734 | : data->operand[i].constraint[0] == '+' ? OP_INOUT |
735 | : OP_IN); |
736 | data->operand[i].is_address = false; |
737 | } |
738 | for (i = 0; i < ndup; i++) |
739 | data->dup_num[i] = recog_data.dup_num[i]; |
740 | } |
741 | return data; |
742 | } |
743 | |
744 | /* The current length of the following array. */ |
745 | int lra_insn_recog_data_len; |
746 | |
747 | /* Map INSN_UID -> the insn recog data (NULL if unknown). */ |
748 | lra_insn_recog_data_t *lra_insn_recog_data; |
749 | |
750 | /* Alloc pool we allocate entries for lra_insn_recog_data from. */ |
751 | static object_allocator<class lra_insn_recog_data> |
752 | lra_insn_recog_data_pool ("insn recog data pool" ); |
753 | |
754 | /* Initialize LRA data about insns. */ |
755 | static void |
756 | init_insn_recog_data (void) |
757 | { |
758 | lra_insn_recog_data_len = 0; |
759 | lra_insn_recog_data = NULL; |
760 | } |
761 | |
762 | /* Expand, if necessary, LRA data about insns. */ |
763 | static void |
764 | check_and_expand_insn_recog_data (int index) |
765 | { |
766 | int i, old; |
767 | |
768 | if (lra_insn_recog_data_len > index) |
769 | return; |
770 | old = lra_insn_recog_data_len; |
771 | lra_insn_recog_data_len = index * 3U / 2; |
772 | if (lra_insn_recog_data_len <= index) |
773 | lra_insn_recog_data_len = index + 1; |
774 | lra_insn_recog_data = XRESIZEVEC (lra_insn_recog_data_t, |
775 | lra_insn_recog_data, |
776 | lra_insn_recog_data_len); |
777 | for (i = old; i < lra_insn_recog_data_len; i++) |
778 | lra_insn_recog_data[i] = NULL; |
779 | } |
780 | |
781 | /* Finish LRA DATA about insn. */ |
782 | static void |
783 | free_insn_recog_data (lra_insn_recog_data_t data) |
784 | { |
785 | if (data->operand_loc != NULL) |
786 | free (ptr: data->operand_loc); |
787 | if (data->dup_loc != NULL) |
788 | free (ptr: data->dup_loc); |
789 | if (data->arg_hard_regs != NULL) |
790 | free (ptr: data->arg_hard_regs); |
791 | if (data->icode < 0 && NONDEBUG_INSN_P (data->insn)) |
792 | { |
793 | if (data->insn_static_data->operand_alternative != NULL) |
794 | free (ptr: const_cast <operand_alternative *> |
795 | (data->insn_static_data->operand_alternative)); |
796 | free_insn_regs (ir: data->insn_static_data->hard_regs); |
797 | free (ptr: data->insn_static_data); |
798 | } |
799 | free_insn_regs (ir: data->regs); |
800 | data->regs = NULL; |
801 | lra_insn_recog_data_pool.remove (object: data); |
802 | } |
803 | |
804 | /* Pools for copies. */ |
805 | static object_allocator<lra_copy> lra_copy_pool ("lra copies" ); |
806 | |
807 | /* Finish LRA data about all insns. */ |
808 | static void |
809 | finish_insn_recog_data (void) |
810 | { |
811 | int i; |
812 | lra_insn_recog_data_t data; |
813 | |
814 | for (i = 0; i < lra_insn_recog_data_len; i++) |
815 | if ((data = lra_insn_recog_data[i]) != NULL) |
816 | free_insn_recog_data (data); |
817 | finish_insn_regs (); |
818 | lra_copy_pool.release (); |
819 | lra_insn_reg_pool.release (); |
820 | lra_insn_recog_data_pool.release (); |
821 | free (ptr: lra_insn_recog_data); |
822 | } |
823 | |
824 | /* Setup info about operands in alternatives of LRA DATA of insn. */ |
825 | static void |
826 | setup_operand_alternative (lra_insn_recog_data_t data, |
827 | const operand_alternative *op_alt) |
828 | { |
829 | int i, j, nop, nalt; |
830 | int icode = data->icode; |
831 | struct lra_static_insn_data *static_data = data->insn_static_data; |
832 | |
833 | static_data->commutative = -1; |
834 | nop = static_data->n_operands; |
835 | nalt = static_data->n_alternatives; |
836 | static_data->operand_alternative = op_alt; |
837 | for (i = 0; i < nop; i++) |
838 | { |
839 | static_data->operand[i].early_clobber_alts = 0; |
840 | static_data->operand[i].is_address = false; |
841 | if (static_data->operand[i].constraint[0] == '%') |
842 | { |
843 | /* We currently only support one commutative pair of operands. */ |
844 | if (static_data->commutative < 0) |
845 | static_data->commutative = i; |
846 | else |
847 | lra_assert (icode < 0); /* Asm */ |
848 | /* The last operand should not be marked commutative. */ |
849 | lra_assert (i != nop - 1); |
850 | } |
851 | } |
852 | for (j = 0; j < nalt; j++) |
853 | for (i = 0; i < nop; i++, op_alt++) |
854 | { |
855 | if (op_alt->earlyclobber) |
856 | static_data->operand[i].early_clobber_alts |= (alternative_mask) 1 << j; |
857 | static_data->operand[i].is_address |= op_alt->is_address; |
858 | } |
859 | } |
860 | |
861 | /* Recursively process X and collect info about registers, which are |
862 | not the insn operands, in X with TYPE (in/out/inout) and flag that |
863 | it is early clobbered in the insn (EARLY_CLOBBER) and add the info |
864 | to LIST. X is a part of insn given by DATA. Return the result |
865 | list. */ |
866 | static struct lra_insn_reg * |
867 | collect_non_operand_hard_regs (rtx_insn *insn, rtx *x, |
868 | lra_insn_recog_data_t data, |
869 | struct lra_insn_reg *list, |
870 | enum op_type type, bool early_clobber) |
871 | { |
872 | int i, j, regno, last; |
873 | bool subreg_p; |
874 | machine_mode mode; |
875 | struct lra_insn_reg *curr; |
876 | rtx op = *x; |
877 | enum rtx_code code = GET_CODE (op); |
878 | const char *fmt = GET_RTX_FORMAT (code); |
879 | |
880 | for (i = 0; i < data->insn_static_data->n_operands; i++) |
881 | if (! data->insn_static_data->operand[i].is_operator |
882 | && x == data->operand_loc[i]) |
883 | /* It is an operand loc. Stop here. */ |
884 | return list; |
885 | for (i = 0; i < data->insn_static_data->n_dups; i++) |
886 | if (x == data->dup_loc[i]) |
887 | /* It is a dup loc. Stop here. */ |
888 | return list; |
889 | mode = GET_MODE (op); |
890 | subreg_p = false; |
891 | if (code == SUBREG) |
892 | { |
893 | mode = wider_subreg_mode (x: op); |
894 | if (read_modify_subreg_p (op)) |
895 | subreg_p = true; |
896 | op = SUBREG_REG (op); |
897 | code = GET_CODE (op); |
898 | } |
899 | if (REG_P (op)) |
900 | { |
901 | if ((regno = REGNO (op)) >= FIRST_PSEUDO_REGISTER) |
902 | return list; |
903 | /* Process all regs even unallocatable ones as we need info |
904 | about all regs for rematerialization pass. */ |
905 | for (last = end_hard_regno (mode, regno); regno < last; regno++) |
906 | { |
907 | for (curr = list; curr != NULL; curr = curr->next) |
908 | if (curr->regno == regno && curr->subreg_p == subreg_p |
909 | && curr->biggest_mode == mode) |
910 | { |
911 | if (curr->type != type) |
912 | curr->type = OP_INOUT; |
913 | if (early_clobber) |
914 | curr->early_clobber_alts = ALL_ALTERNATIVES; |
915 | break; |
916 | } |
917 | if (curr == NULL) |
918 | { |
919 | /* This is a new hard regno or the info cannot be |
920 | integrated into the found structure. */ |
921 | #ifdef STACK_REGS |
922 | early_clobber |
923 | = (early_clobber |
924 | /* This clobber is to inform popping floating |
925 | point stack only. */ |
926 | && ! (FIRST_STACK_REG <= regno |
927 | && regno <= LAST_STACK_REG)); |
928 | #endif |
929 | list = new_insn_reg (insn: data->insn, regno, type, mode, subreg_p, |
930 | early_clobber_alts: early_clobber ? ALL_ALTERNATIVES : 0, next: list); |
931 | } |
932 | } |
933 | return list; |
934 | } |
935 | switch (code) |
936 | { |
937 | case SET: |
938 | list = collect_non_operand_hard_regs (insn, x: &SET_DEST (op), data, |
939 | list, type: OP_OUT, early_clobber: false); |
940 | list = collect_non_operand_hard_regs (insn, x: &SET_SRC (op), data, |
941 | list, type: OP_IN, early_clobber: false); |
942 | break; |
943 | case CLOBBER: |
944 | /* We treat clobber of non-operand hard registers as early clobber. */ |
945 | list = collect_non_operand_hard_regs (insn, x: &XEXP (op, 0), data, |
946 | list, type: OP_OUT, early_clobber: true); |
947 | break; |
948 | case PRE_INC: case PRE_DEC: case POST_INC: case POST_DEC: |
949 | list = collect_non_operand_hard_regs (insn, x: &XEXP (op, 0), data, |
950 | list, type: OP_INOUT, early_clobber: false); |
951 | break; |
952 | case PRE_MODIFY: case POST_MODIFY: |
953 | list = collect_non_operand_hard_regs (insn, x: &XEXP (op, 0), data, |
954 | list, type: OP_INOUT, early_clobber: false); |
955 | list = collect_non_operand_hard_regs (insn, x: &XEXP (op, 1), data, |
956 | list, type: OP_IN, early_clobber: false); |
957 | break; |
958 | default: |
959 | fmt = GET_RTX_FORMAT (code); |
960 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) |
961 | { |
962 | if (fmt[i] == 'e') |
963 | list = collect_non_operand_hard_regs (insn, x: &XEXP (op, i), data, |
964 | list, type: OP_IN, early_clobber: false); |
965 | else if (fmt[i] == 'E') |
966 | for (j = XVECLEN (op, i) - 1; j >= 0; j--) |
967 | list = collect_non_operand_hard_regs (insn, x: &XVECEXP (op, i, j), |
968 | data, list, type: OP_IN, early_clobber: false); |
969 | } |
970 | } |
971 | return list; |
972 | } |
973 | |
974 | /* Set up and return info about INSN. Set up the info if it is not set up |
975 | yet. */ |
976 | lra_insn_recog_data_t |
977 | lra_set_insn_recog_data (rtx_insn *insn) |
978 | { |
979 | lra_insn_recog_data_t data; |
980 | int i, n, icode; |
981 | rtx **locs; |
982 | unsigned int uid = INSN_UID (insn); |
983 | struct lra_static_insn_data *insn_static_data; |
984 | |
985 | check_and_expand_insn_recog_data (index: uid); |
986 | if (DEBUG_INSN_P (insn)) |
987 | icode = -1; |
988 | else |
989 | { |
990 | icode = INSN_CODE (insn); |
991 | if (icode < 0) |
992 | /* It might be a new simple insn which is not recognized yet. */ |
993 | INSN_CODE (insn) = icode = recog_memoized (insn); |
994 | } |
995 | data = lra_insn_recog_data_pool.allocate (); |
996 | lra_insn_recog_data[uid] = data; |
997 | data->insn = insn; |
998 | data->used_insn_alternative = LRA_UNKNOWN_ALT; |
999 | data->asm_reloads_num = 0; |
1000 | data->icode = icode; |
1001 | data->regs = NULL; |
1002 | if (DEBUG_INSN_P (insn)) |
1003 | { |
1004 | data->dup_loc = NULL; |
1005 | data->arg_hard_regs = NULL; |
1006 | data->preferred_alternatives = ALL_ALTERNATIVES; |
1007 | if (DEBUG_BIND_INSN_P (insn)) |
1008 | { |
1009 | data->insn_static_data = &debug_bind_static_data; |
1010 | data->operand_loc = XNEWVEC (rtx *, 1); |
1011 | data->operand_loc[0] = &INSN_VAR_LOCATION_LOC (insn); |
1012 | } |
1013 | else if (DEBUG_MARKER_INSN_P (insn)) |
1014 | { |
1015 | data->insn_static_data = &debug_marker_static_data; |
1016 | data->operand_loc = NULL; |
1017 | } |
1018 | return data; |
1019 | } |
1020 | if (icode < 0) |
1021 | { |
1022 | int nop, nalt; |
1023 | machine_mode operand_mode[MAX_RECOG_OPERANDS]; |
1024 | const char *constraints[MAX_RECOG_OPERANDS]; |
1025 | |
1026 | nop = asm_noperands (PATTERN (insn)); |
1027 | data->operand_loc = data->dup_loc = NULL; |
1028 | nalt = 1; |
1029 | if (nop < 0) |
1030 | { |
1031 | /* It is a special insn like USE or CLOBBER. We should |
1032 | recognize any regular insn otherwise LRA can do nothing |
1033 | with this insn. */ |
1034 | gcc_assert (GET_CODE (PATTERN (insn)) == USE |
1035 | || GET_CODE (PATTERN (insn)) == CLOBBER |
1036 | || GET_CODE (PATTERN (insn)) == ASM_INPUT); |
1037 | data->insn_static_data = insn_static_data |
1038 | = get_static_insn_data (icode: -1, nop: 0, ndup: 0, nalt); |
1039 | } |
1040 | else |
1041 | { |
1042 | /* expand_asm_operands makes sure there aren't too many |
1043 | operands. */ |
1044 | lra_assert (nop <= MAX_RECOG_OPERANDS); |
1045 | if (nop != 0) |
1046 | data->operand_loc = XNEWVEC (rtx *, nop); |
1047 | /* Now get the operand values and constraints out of the |
1048 | insn. */ |
1049 | decode_asm_operands (PATTERN (insn), NULL, |
1050 | data->operand_loc, |
1051 | constraints, operand_mode, NULL); |
1052 | if (nop > 0) |
1053 | for (const char *p =constraints[0]; *p; p++) |
1054 | nalt += *p == ','; |
1055 | data->insn_static_data = insn_static_data |
1056 | = get_static_insn_data (icode: -1, nop, ndup: 0, nalt); |
1057 | for (i = 0; i < nop; i++) |
1058 | { |
1059 | insn_static_data->operand[i].mode = operand_mode[i]; |
1060 | insn_static_data->operand[i].constraint = constraints[i]; |
1061 | insn_static_data->operand[i].strict_low = false; |
1062 | insn_static_data->operand[i].is_operator = false; |
1063 | insn_static_data->operand[i].is_address = false; |
1064 | } |
1065 | } |
1066 | for (i = 0; i < insn_static_data->n_operands; i++) |
1067 | insn_static_data->operand[i].type |
1068 | = (insn_static_data->operand[i].constraint[0] == '=' ? OP_OUT |
1069 | : insn_static_data->operand[i].constraint[0] == '+' ? OP_INOUT |
1070 | : OP_IN); |
1071 | data->preferred_alternatives = ALL_ALTERNATIVES; |
1072 | if (nop > 0) |
1073 | { |
1074 | operand_alternative *op_alt = XCNEWVEC (operand_alternative, |
1075 | nalt * nop); |
1076 | preprocess_constraints (nop, nalt, constraints, op_alt, |
1077 | data->operand_loc); |
1078 | setup_operand_alternative (data, op_alt); |
1079 | } |
1080 | } |
1081 | else |
1082 | { |
1083 | insn_extract (insn); |
1084 | data->insn_static_data = insn_static_data |
1085 | = get_static_insn_data (icode, nop: insn_data[icode].n_operands, |
1086 | ndup: insn_data[icode].n_dups, |
1087 | nalt: insn_data[icode].n_alternatives); |
1088 | n = insn_static_data->n_operands; |
1089 | if (n == 0) |
1090 | locs = NULL; |
1091 | else |
1092 | { |
1093 | locs = XNEWVEC (rtx *, n); |
1094 | memcpy (dest: locs, src: recog_data.operand_loc, n: n * sizeof (rtx *)); |
1095 | } |
1096 | data->operand_loc = locs; |
1097 | n = insn_static_data->n_dups; |
1098 | if (n == 0) |
1099 | locs = NULL; |
1100 | else |
1101 | { |
1102 | locs = XNEWVEC (rtx *, n); |
1103 | memcpy (dest: locs, src: recog_data.dup_loc, n: n * sizeof (rtx *)); |
1104 | } |
1105 | data->dup_loc = locs; |
1106 | data->preferred_alternatives = get_preferred_alternatives (insn); |
1107 | const operand_alternative *op_alt = preprocess_insn_constraints (icode); |
1108 | if (!insn_static_data->operand_alternative) |
1109 | setup_operand_alternative (data, op_alt); |
1110 | else if (op_alt != insn_static_data->operand_alternative) |
1111 | insn_static_data->operand_alternative = op_alt; |
1112 | } |
1113 | if (GET_CODE (PATTERN (insn)) == CLOBBER || GET_CODE (PATTERN (insn)) == USE) |
1114 | insn_static_data->hard_regs = NULL; |
1115 | else |
1116 | insn_static_data->hard_regs |
1117 | = collect_non_operand_hard_regs (insn, x: &PATTERN (insn), data, |
1118 | NULL, type: OP_IN, early_clobber: false); |
1119 | data->arg_hard_regs = NULL; |
1120 | if (CALL_P (insn)) |
1121 | { |
1122 | bool use_p; |
1123 | rtx link; |
1124 | int n_hard_regs, regno, arg_hard_regs[FIRST_PSEUDO_REGISTER]; |
1125 | |
1126 | n_hard_regs = 0; |
1127 | /* Finding implicit hard register usage. We believe it will be |
1128 | not changed whatever transformations are used. Call insns |
1129 | are such example. */ |
1130 | for (link = CALL_INSN_FUNCTION_USAGE (insn); |
1131 | link != NULL_RTX; |
1132 | link = XEXP (link, 1)) |
1133 | if (((use_p = GET_CODE (XEXP (link, 0)) == USE) |
1134 | || GET_CODE (XEXP (link, 0)) == CLOBBER) |
1135 | && REG_P (XEXP (XEXP (link, 0), 0))) |
1136 | { |
1137 | regno = REGNO (XEXP (XEXP (link, 0), 0)); |
1138 | lra_assert (regno < FIRST_PSEUDO_REGISTER); |
1139 | /* It is an argument register. */ |
1140 | for (i = REG_NREGS (XEXP (XEXP (link, 0), 0)) - 1; i >= 0; i--) |
1141 | arg_hard_regs[n_hard_regs++] |
1142 | = regno + i + (use_p ? 0 : FIRST_PSEUDO_REGISTER); |
1143 | } |
1144 | |
1145 | if (n_hard_regs != 0) |
1146 | { |
1147 | arg_hard_regs[n_hard_regs++] = -1; |
1148 | data->arg_hard_regs = XNEWVEC (int, n_hard_regs); |
1149 | memcpy (dest: data->arg_hard_regs, src: arg_hard_regs, |
1150 | n: sizeof (int) * n_hard_regs); |
1151 | } |
1152 | } |
1153 | /* Some output operand can be recognized only from the context not |
1154 | from the constraints which are empty in this case. Call insn may |
1155 | contain a hard register in set destination with empty constraint |
1156 | and extract_insn treats them as an input. */ |
1157 | for (i = 0; i < insn_static_data->n_operands; i++) |
1158 | { |
1159 | int j; |
1160 | rtx pat, set; |
1161 | struct lra_operand_data *operand = &insn_static_data->operand[i]; |
1162 | |
1163 | /* ??? Should we treat 'X' the same way. It looks to me that |
1164 | 'X' means anything and empty constraint means we do not |
1165 | care. */ |
1166 | if (operand->type != OP_IN || *operand->constraint != '\0' |
1167 | || operand->is_operator) |
1168 | continue; |
1169 | pat = PATTERN (insn); |
1170 | if (GET_CODE (pat) == SET) |
1171 | { |
1172 | if (data->operand_loc[i] != &SET_DEST (pat)) |
1173 | continue; |
1174 | } |
1175 | else if (GET_CODE (pat) == PARALLEL) |
1176 | { |
1177 | for (j = XVECLEN (pat, 0) - 1; j >= 0; j--) |
1178 | { |
1179 | set = XVECEXP (PATTERN (insn), 0, j); |
1180 | if (GET_CODE (set) == SET |
1181 | && &SET_DEST (set) == data->operand_loc[i]) |
1182 | break; |
1183 | } |
1184 | if (j < 0) |
1185 | continue; |
1186 | } |
1187 | else |
1188 | continue; |
1189 | operand->type = OP_OUT; |
1190 | } |
1191 | return data; |
1192 | } |
1193 | |
1194 | /* Return info about insn give by UID. The info should be already set |
1195 | up. */ |
1196 | static lra_insn_recog_data_t |
1197 | get_insn_recog_data_by_uid (int uid) |
1198 | { |
1199 | lra_insn_recog_data_t data; |
1200 | |
1201 | data = lra_insn_recog_data[uid]; |
1202 | lra_assert (data != NULL); |
1203 | return data; |
1204 | } |
1205 | |
1206 | /* Invalidate all info about insn given by its UID. */ |
1207 | static void |
1208 | invalidate_insn_recog_data (int uid) |
1209 | { |
1210 | lra_insn_recog_data_t data; |
1211 | |
1212 | data = lra_insn_recog_data[uid]; |
1213 | lra_assert (data != NULL); |
1214 | free_insn_recog_data (data); |
1215 | lra_insn_recog_data[uid] = NULL; |
1216 | } |
1217 | |
1218 | /* Update all the insn info about INSN. It is usually called when |
1219 | something in the insn was changed. Return the updated info. */ |
1220 | lra_insn_recog_data_t |
1221 | lra_update_insn_recog_data (rtx_insn *insn) |
1222 | { |
1223 | lra_insn_recog_data_t data; |
1224 | int n; |
1225 | unsigned int uid = INSN_UID (insn); |
1226 | struct lra_static_insn_data *insn_static_data; |
1227 | poly_int64 sp_offset = 0; |
1228 | |
1229 | check_and_expand_insn_recog_data (index: uid); |
1230 | if ((data = lra_insn_recog_data[uid]) != NULL |
1231 | && data->icode != INSN_CODE (insn)) |
1232 | { |
1233 | sp_offset = data->sp_offset; |
1234 | invalidate_insn_data_regno_info (data, insn, get_insn_freq (insn)); |
1235 | invalidate_insn_recog_data (uid); |
1236 | data = NULL; |
1237 | } |
1238 | if (data == NULL) |
1239 | { |
1240 | data = lra_get_insn_recog_data (insn); |
1241 | /* Initiate or restore SP offset. */ |
1242 | data->sp_offset = sp_offset; |
1243 | return data; |
1244 | } |
1245 | insn_static_data = data->insn_static_data; |
1246 | data->used_insn_alternative = LRA_UNKNOWN_ALT; |
1247 | if (DEBUG_INSN_P (insn)) |
1248 | return data; |
1249 | if (data->icode < 0) |
1250 | { |
1251 | int nop; |
1252 | machine_mode operand_mode[MAX_RECOG_OPERANDS]; |
1253 | const char *constraints[MAX_RECOG_OPERANDS]; |
1254 | |
1255 | nop = asm_noperands (PATTERN (insn)); |
1256 | if (nop >= 0) |
1257 | { |
1258 | lra_assert (nop == data->insn_static_data->n_operands); |
1259 | /* Now get the operand values and constraints out of the |
1260 | insn. */ |
1261 | decode_asm_operands (PATTERN (insn), NULL, |
1262 | data->operand_loc, |
1263 | constraints, operand_mode, NULL); |
1264 | |
1265 | if (flag_checking) |
1266 | for (int i = 0; i < nop; i++) |
1267 | lra_assert |
1268 | (insn_static_data->operand[i].mode == operand_mode[i] |
1269 | && insn_static_data->operand[i].constraint == constraints[i] |
1270 | && ! insn_static_data->operand[i].is_operator); |
1271 | } |
1272 | |
1273 | if (flag_checking) |
1274 | for (int i = 0; i < insn_static_data->n_operands; i++) |
1275 | lra_assert |
1276 | (insn_static_data->operand[i].type |
1277 | == (insn_static_data->operand[i].constraint[0] == '=' ? OP_OUT |
1278 | : insn_static_data->operand[i].constraint[0] == '+' ? OP_INOUT |
1279 | : OP_IN)); |
1280 | } |
1281 | else |
1282 | { |
1283 | insn_extract (insn); |
1284 | n = insn_static_data->n_operands; |
1285 | if (n != 0) |
1286 | memcpy (dest: data->operand_loc, src: recog_data.operand_loc, n: n * sizeof (rtx *)); |
1287 | n = insn_static_data->n_dups; |
1288 | if (n != 0) |
1289 | memcpy (dest: data->dup_loc, src: recog_data.dup_loc, n: n * sizeof (rtx *)); |
1290 | lra_assert (check_bool_attrs (insn)); |
1291 | } |
1292 | return data; |
1293 | } |
1294 | |
1295 | /* Set up that INSN is using alternative ALT now. */ |
1296 | void |
1297 | lra_set_used_insn_alternative (rtx_insn *insn, int alt) |
1298 | { |
1299 | lra_insn_recog_data_t data; |
1300 | |
1301 | data = lra_get_insn_recog_data (insn); |
1302 | data->used_insn_alternative = alt; |
1303 | } |
1304 | |
1305 | /* Set up that insn with UID is using alternative ALT now. The insn |
1306 | info should be already set up. */ |
1307 | void |
1308 | lra_set_used_insn_alternative_by_uid (int uid, int alt) |
1309 | { |
1310 | lra_insn_recog_data_t data; |
1311 | |
1312 | check_and_expand_insn_recog_data (index: uid); |
1313 | data = lra_insn_recog_data[uid]; |
1314 | lra_assert (data != NULL); |
1315 | data->used_insn_alternative = alt; |
1316 | } |
1317 | |
1318 | |
1319 | |
1320 | /* This page contains code dealing with common register info and |
1321 | pseudo copies. */ |
1322 | |
1323 | /* The size of the following array. */ |
1324 | static int reg_info_size; |
1325 | /* Common info about each register. */ |
1326 | class lra_reg *lra_reg_info; |
1327 | |
1328 | HARD_REG_SET hard_regs_spilled_into; |
1329 | |
1330 | /* Last register value. */ |
1331 | static int last_reg_value; |
1332 | |
1333 | /* Return new register value. */ |
1334 | static int |
1335 | get_new_reg_value (void) |
1336 | { |
1337 | return ++last_reg_value; |
1338 | } |
1339 | |
1340 | /* Vec referring to pseudo copies. */ |
1341 | static vec<lra_copy_t> copy_vec; |
1342 | |
1343 | /* Initialize I-th element of lra_reg_info. */ |
1344 | static inline void |
1345 | initialize_lra_reg_info_element (int i) |
1346 | { |
1347 | bitmap_initialize (head: &lra_reg_info[i].insn_bitmap, obstack: ®_obstack); |
1348 | #ifdef STACK_REGS |
1349 | lra_reg_info[i].no_stack_p = false; |
1350 | #endif |
1351 | CLEAR_HARD_REG_SET (set&: lra_reg_info[i].conflict_hard_regs); |
1352 | CLEAR_HARD_REG_SET (set&: lra_reg_info[i].exclude_start_hard_regs); |
1353 | lra_reg_info[i].preferred_hard_regno1 = -1; |
1354 | lra_reg_info[i].preferred_hard_regno2 = -1; |
1355 | lra_reg_info[i].preferred_hard_regno_profit1 = 0; |
1356 | lra_reg_info[i].preferred_hard_regno_profit2 = 0; |
1357 | lra_reg_info[i].biggest_mode = VOIDmode; |
1358 | lra_reg_info[i].live_ranges = NULL; |
1359 | lra_reg_info[i].nrefs = lra_reg_info[i].freq = 0; |
1360 | lra_reg_info[i].last_reload = 0; |
1361 | lra_reg_info[i].restore_rtx = NULL_RTX; |
1362 | lra_reg_info[i].val = get_new_reg_value (); |
1363 | lra_reg_info[i].offset = 0; |
1364 | lra_reg_info[i].copies = NULL; |
1365 | } |
1366 | |
1367 | /* Initialize common reg info and copies. */ |
1368 | static void |
1369 | init_reg_info (void) |
1370 | { |
1371 | int i; |
1372 | |
1373 | last_reg_value = 0; |
1374 | reg_info_size = max_reg_num () * 3 / 2 + 1; |
1375 | lra_reg_info = XNEWVEC (class lra_reg, reg_info_size); |
1376 | for (i = 0; i < reg_info_size; i++) |
1377 | initialize_lra_reg_info_element (i); |
1378 | copy_vec.truncate (size: 0); |
1379 | CLEAR_HARD_REG_SET (set&: hard_regs_spilled_into); |
1380 | } |
1381 | |
1382 | |
1383 | /* Finish common reg info and copies. */ |
1384 | static void |
1385 | finish_reg_info (void) |
1386 | { |
1387 | int i; |
1388 | |
1389 | for (i = 0; i < reg_info_size; i++) |
1390 | bitmap_clear (&lra_reg_info[i].insn_bitmap); |
1391 | free (ptr: lra_reg_info); |
1392 | reg_info_size = 0; |
1393 | } |
1394 | |
1395 | /* Expand common reg info if it is necessary. */ |
1396 | static void |
1397 | expand_reg_info (void) |
1398 | { |
1399 | int i, old = reg_info_size; |
1400 | |
1401 | if (reg_info_size > max_reg_num ()) |
1402 | return; |
1403 | reg_info_size = max_reg_num () * 3 / 2 + 1; |
1404 | lra_reg_info = XRESIZEVEC (class lra_reg, lra_reg_info, reg_info_size); |
1405 | for (i = old; i < reg_info_size; i++) |
1406 | initialize_lra_reg_info_element (i); |
1407 | } |
1408 | |
1409 | /* Free all copies. */ |
1410 | void |
1411 | lra_free_copies (void) |
1412 | { |
1413 | lra_copy_t cp; |
1414 | |
1415 | while (copy_vec.length () != 0) |
1416 | { |
1417 | cp = copy_vec.pop (); |
1418 | lra_reg_info[cp->regno1].copies = lra_reg_info[cp->regno2].copies = NULL; |
1419 | lra_copy_pool.remove (object: cp); |
1420 | } |
1421 | } |
1422 | |
1423 | /* Create copy of two pseudos REGNO1 and REGNO2. The copy execution |
1424 | frequency is FREQ. */ |
1425 | void |
1426 | lra_create_copy (int regno1, int regno2, int freq) |
1427 | { |
1428 | bool regno1_dest_p; |
1429 | lra_copy_t cp; |
1430 | |
1431 | lra_assert (regno1 != regno2); |
1432 | regno1_dest_p = true; |
1433 | if (regno1 > regno2) |
1434 | { |
1435 | std::swap (a&: regno1, b&: regno2); |
1436 | regno1_dest_p = false; |
1437 | } |
1438 | cp = lra_copy_pool.allocate (); |
1439 | copy_vec.safe_push (obj: cp); |
1440 | cp->regno1_dest_p = regno1_dest_p; |
1441 | cp->freq = freq; |
1442 | cp->regno1 = regno1; |
1443 | cp->regno2 = regno2; |
1444 | cp->regno1_next = lra_reg_info[regno1].copies; |
1445 | lra_reg_info[regno1].copies = cp; |
1446 | cp->regno2_next = lra_reg_info[regno2].copies; |
1447 | lra_reg_info[regno2].copies = cp; |
1448 | if (lra_dump_file != NULL) |
1449 | fprintf (stream: lra_dump_file, format: " Creating copy r%d%sr%d@%d\n" , |
1450 | regno1, regno1_dest_p ? "<-" : "->" , regno2, freq); |
1451 | } |
1452 | |
1453 | /* Return N-th (0, 1, ...) copy. If there is no copy, return |
1454 | NULL. */ |
1455 | lra_copy_t |
1456 | lra_get_copy (int n) |
1457 | { |
1458 | if (n >= (int) copy_vec.length ()) |
1459 | return NULL; |
1460 | return copy_vec[n]; |
1461 | } |
1462 | |
1463 | |
1464 | |
1465 | /* This page contains code dealing with info about registers in |
1466 | insns. */ |
1467 | |
1468 | /* Process X of INSN recursively and add info (operand type is given |
1469 | by TYPE) about registers in X to the insn DATA. If X can be early |
1470 | clobbered, alternatives in which it can be early clobbered are given |
1471 | by EARLY_CLOBBER_ALTS. */ |
1472 | static void |
1473 | add_regs_to_insn_regno_info (lra_insn_recog_data_t data, rtx x, |
1474 | rtx_insn *insn, enum op_type type, |
1475 | alternative_mask early_clobber_alts) |
1476 | { |
1477 | int i, j, regno; |
1478 | bool subreg_p; |
1479 | machine_mode mode; |
1480 | const char *fmt; |
1481 | enum rtx_code code; |
1482 | struct lra_insn_reg *curr; |
1483 | |
1484 | code = GET_CODE (x); |
1485 | mode = GET_MODE (x); |
1486 | subreg_p = false; |
1487 | if (GET_CODE (x) == SUBREG) |
1488 | { |
1489 | mode = wider_subreg_mode (x); |
1490 | if (read_modify_subreg_p (x)) |
1491 | subreg_p = true; |
1492 | x = SUBREG_REG (x); |
1493 | code = GET_CODE (x); |
1494 | } |
1495 | if (REG_P (x)) |
1496 | { |
1497 | regno = REGNO (x); |
1498 | /* Process all regs even unallocatable ones as we need info about |
1499 | all regs for rematerialization pass. */ |
1500 | expand_reg_info (); |
1501 | if (bitmap_set_bit (&lra_reg_info[regno].insn_bitmap, INSN_UID (insn))) |
1502 | { |
1503 | data->regs = new_insn_reg (insn: data->insn, regno, type, mode, subreg_p, |
1504 | early_clobber_alts, next: data->regs); |
1505 | return; |
1506 | } |
1507 | else |
1508 | { |
1509 | for (curr = data->regs; curr != NULL; curr = curr->next) |
1510 | if (curr->regno == regno) |
1511 | { |
1512 | if (curr->subreg_p != subreg_p || curr->biggest_mode != mode) |
1513 | /* The info cannot be integrated into the found |
1514 | structure. */ |
1515 | data->regs = new_insn_reg (insn: data->insn, regno, type, mode, |
1516 | subreg_p, early_clobber_alts, |
1517 | next: data->regs); |
1518 | else |
1519 | { |
1520 | if (curr->type != type) |
1521 | curr->type = OP_INOUT; |
1522 | curr->early_clobber_alts |= early_clobber_alts; |
1523 | } |
1524 | return; |
1525 | } |
1526 | gcc_unreachable (); |
1527 | } |
1528 | } |
1529 | |
1530 | switch (code) |
1531 | { |
1532 | case SET: |
1533 | add_regs_to_insn_regno_info (data, SET_DEST (x), insn, type: OP_OUT, early_clobber_alts: 0); |
1534 | add_regs_to_insn_regno_info (data, SET_SRC (x), insn, type: OP_IN, early_clobber_alts: 0); |
1535 | break; |
1536 | case CLOBBER: |
1537 | /* We treat clobber of non-operand hard registers as early |
1538 | clobber. */ |
1539 | add_regs_to_insn_regno_info (data, XEXP (x, 0), insn, type: OP_OUT, |
1540 | ALL_ALTERNATIVES); |
1541 | break; |
1542 | case PRE_INC: case PRE_DEC: case POST_INC: case POST_DEC: |
1543 | add_regs_to_insn_regno_info (data, XEXP (x, 0), insn, type: OP_INOUT, early_clobber_alts: 0); |
1544 | break; |
1545 | case PRE_MODIFY: case POST_MODIFY: |
1546 | add_regs_to_insn_regno_info (data, XEXP (x, 0), insn, type: OP_INOUT, early_clobber_alts: 0); |
1547 | add_regs_to_insn_regno_info (data, XEXP (x, 1), insn, type: OP_IN, early_clobber_alts: 0); |
1548 | break; |
1549 | default: |
1550 | if ((code != PARALLEL && code != EXPR_LIST) || type != OP_OUT) |
1551 | /* Some targets place small structures in registers for return |
1552 | values of functions, and those registers are wrapped in |
1553 | PARALLEL that we may see as the destination of a SET. Here |
1554 | is an example: |
1555 | |
1556 | (call_insn 13 12 14 2 (set (parallel:BLK [ |
1557 | (expr_list:REG_DEP_TRUE (reg:DI 0 ax) |
1558 | (const_int 0 [0])) |
1559 | (expr_list:REG_DEP_TRUE (reg:DI 1 dx) |
1560 | (const_int 8 [0x8])) |
1561 | ]) |
1562 | (call (mem:QI (symbol_ref:DI (... */ |
1563 | type = OP_IN; |
1564 | fmt = GET_RTX_FORMAT (code); |
1565 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) |
1566 | { |
1567 | if (fmt[i] == 'e') |
1568 | add_regs_to_insn_regno_info (data, XEXP (x, i), insn, type, early_clobber_alts: 0); |
1569 | else if (fmt[i] == 'E') |
1570 | { |
1571 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) |
1572 | add_regs_to_insn_regno_info (data, XVECEXP (x, i, j), insn, |
1573 | type, early_clobber_alts: 0); |
1574 | } |
1575 | } |
1576 | } |
1577 | } |
1578 | |
1579 | /* Return execution frequency of INSN. */ |
1580 | static int |
1581 | get_insn_freq (rtx_insn *insn) |
1582 | { |
1583 | basic_block bb = BLOCK_FOR_INSN (insn); |
1584 | |
1585 | gcc_checking_assert (bb != NULL); |
1586 | return REG_FREQ_FROM_BB (bb); |
1587 | } |
1588 | |
1589 | /* Invalidate all reg info of INSN with DATA and execution frequency |
1590 | FREQ. Update common info about the invalidated registers. */ |
1591 | static void |
1592 | invalidate_insn_data_regno_info (lra_insn_recog_data_t data, rtx_insn *insn, |
1593 | int freq) |
1594 | { |
1595 | int uid; |
1596 | bool debug_p; |
1597 | unsigned int i; |
1598 | struct lra_insn_reg *ir, *next_ir; |
1599 | |
1600 | uid = INSN_UID (insn); |
1601 | debug_p = DEBUG_INSN_P (insn); |
1602 | for (ir = data->regs; ir != NULL; ir = next_ir) |
1603 | { |
1604 | i = ir->regno; |
1605 | next_ir = ir->next; |
1606 | lra_insn_reg_pool.remove (object: ir); |
1607 | bitmap_clear_bit (&lra_reg_info[i].insn_bitmap, uid); |
1608 | if (i >= FIRST_PSEUDO_REGISTER && ! debug_p) |
1609 | { |
1610 | lra_reg_info[i].nrefs--; |
1611 | lra_reg_info[i].freq -= freq; |
1612 | lra_assert (lra_reg_info[i].nrefs >= 0 && lra_reg_info[i].freq >= 0); |
1613 | } |
1614 | } |
1615 | data->regs = NULL; |
1616 | } |
1617 | |
1618 | /* Invalidate all reg info of INSN. Update common info about the |
1619 | invalidated registers. */ |
1620 | void |
1621 | lra_invalidate_insn_regno_info (rtx_insn *insn) |
1622 | { |
1623 | invalidate_insn_data_regno_info (data: lra_get_insn_recog_data (insn), insn, |
1624 | freq: get_insn_freq (insn)); |
1625 | } |
1626 | |
1627 | /* Update common reg info from reg info of insn given by its DATA and |
1628 | execution frequency FREQ. */ |
1629 | static void |
1630 | setup_insn_reg_info (lra_insn_recog_data_t data, int freq) |
1631 | { |
1632 | unsigned int i; |
1633 | struct lra_insn_reg *ir; |
1634 | |
1635 | for (ir = data->regs; ir != NULL; ir = ir->next) |
1636 | if ((i = ir->regno) >= FIRST_PSEUDO_REGISTER) |
1637 | { |
1638 | lra_reg_info[i].nrefs++; |
1639 | lra_reg_info[i].freq += freq; |
1640 | } |
1641 | } |
1642 | |
1643 | /* Set up insn reg info of INSN. Update common reg info from reg info |
1644 | of INSN. */ |
1645 | void |
1646 | lra_update_insn_regno_info (rtx_insn *insn) |
1647 | { |
1648 | int i, freq; |
1649 | lra_insn_recog_data_t data; |
1650 | struct lra_static_insn_data *static_data; |
1651 | enum rtx_code code; |
1652 | rtx link; |
1653 | |
1654 | if (! INSN_P (insn)) |
1655 | return; |
1656 | data = lra_get_insn_recog_data (insn); |
1657 | static_data = data->insn_static_data; |
1658 | freq = NONDEBUG_INSN_P (insn) ? get_insn_freq (insn) : 0; |
1659 | invalidate_insn_data_regno_info (data, insn, freq); |
1660 | for (i = static_data->n_operands - 1; i >= 0; i--) |
1661 | add_regs_to_insn_regno_info (data, x: *data->operand_loc[i], insn, |
1662 | type: static_data->operand[i].type, |
1663 | early_clobber_alts: static_data->operand[i].early_clobber_alts); |
1664 | if ((code = GET_CODE (PATTERN (insn))) == CLOBBER || code == USE) |
1665 | add_regs_to_insn_regno_info (data, XEXP (PATTERN (insn), 0), insn, |
1666 | type: code == USE ? OP_IN : OP_OUT, early_clobber_alts: 0); |
1667 | if (CALL_P (insn)) |
1668 | /* On some targets call insns can refer to pseudos in memory in |
1669 | CALL_INSN_FUNCTION_USAGE list. Process them in order to |
1670 | consider their occurrences in calls for different |
1671 | transformations (e.g. inheritance) with given pseudos. */ |
1672 | for (link = CALL_INSN_FUNCTION_USAGE (insn); |
1673 | link != NULL_RTX; |
1674 | link = XEXP (link, 1)) |
1675 | { |
1676 | code = GET_CODE (XEXP (link, 0)); |
1677 | if ((code == USE || code == CLOBBER) |
1678 | && MEM_P (XEXP (XEXP (link, 0), 0))) |
1679 | add_regs_to_insn_regno_info (data, XEXP (XEXP (link, 0), 0), insn, |
1680 | type: code == USE ? OP_IN : OP_OUT, early_clobber_alts: 0); |
1681 | } |
1682 | if (NONDEBUG_INSN_P (insn)) |
1683 | setup_insn_reg_info (data, freq); |
1684 | } |
1685 | |
1686 | /* Return reg info of insn given by it UID. */ |
1687 | struct lra_insn_reg * |
1688 | lra_get_insn_regs (int uid) |
1689 | { |
1690 | lra_insn_recog_data_t data; |
1691 | |
1692 | data = get_insn_recog_data_by_uid (uid); |
1693 | return data->regs; |
1694 | } |
1695 | |
1696 | |
1697 | |
1698 | /* Recursive hash function for RTL X. */ |
1699 | hashval_t |
1700 | lra_rtx_hash (rtx x) |
1701 | { |
1702 | int i, j; |
1703 | enum rtx_code code; |
1704 | const char *fmt; |
1705 | hashval_t val = 0; |
1706 | |
1707 | if (x == 0) |
1708 | return val; |
1709 | |
1710 | code = GET_CODE (x); |
1711 | val += (int) code + 4095; |
1712 | |
1713 | /* Some RTL can be compared nonrecursively. */ |
1714 | switch (code) |
1715 | { |
1716 | case REG: |
1717 | return val + REGNO (x); |
1718 | |
1719 | case LABEL_REF: |
1720 | return iterative_hash_object (XEXP (x, 0), val); |
1721 | |
1722 | case SYMBOL_REF: |
1723 | return iterative_hash_object (XSTR (x, 0), val); |
1724 | |
1725 | case SCRATCH: |
1726 | case CONST_DOUBLE: |
1727 | case CONST_VECTOR: |
1728 | return val; |
1729 | |
1730 | case CONST_INT: |
1731 | return val + UINTVAL (x); |
1732 | |
1733 | default: |
1734 | break; |
1735 | } |
1736 | |
1737 | /* Hash the elements. */ |
1738 | fmt = GET_RTX_FORMAT (code); |
1739 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) |
1740 | { |
1741 | switch (fmt[i]) |
1742 | { |
1743 | case 'w': |
1744 | val += XWINT (x, i); |
1745 | break; |
1746 | |
1747 | case 'n': |
1748 | case 'i': |
1749 | val += XINT (x, i); |
1750 | break; |
1751 | |
1752 | case 'V': |
1753 | case 'E': |
1754 | val += XVECLEN (x, i); |
1755 | |
1756 | for (j = 0; j < XVECLEN (x, i); j++) |
1757 | val += lra_rtx_hash (XVECEXP (x, i, j)); |
1758 | break; |
1759 | |
1760 | case 'e': |
1761 | val += lra_rtx_hash (XEXP (x, i)); |
1762 | break; |
1763 | |
1764 | case 'S': |
1765 | case 's': |
1766 | val += htab_hash_string (XSTR (x, i)); |
1767 | break; |
1768 | |
1769 | case 'u': |
1770 | case '0': |
1771 | case 't': |
1772 | break; |
1773 | |
1774 | /* It is believed that rtx's at this level will never |
1775 | contain anything but integers and other rtx's, except for |
1776 | within LABEL_REFs and SYMBOL_REFs. */ |
1777 | default: |
1778 | abort (); |
1779 | } |
1780 | } |
1781 | return val; |
1782 | } |
1783 | |
1784 | |
1785 | |
1786 | /* This page contains code dealing with stack of the insns which |
1787 | should be processed by the next constraint pass. */ |
1788 | |
1789 | /* Bitmap used to put an insn on the stack only in one exemplar. */ |
1790 | static sbitmap lra_constraint_insn_stack_bitmap; |
1791 | |
1792 | /* The stack itself. */ |
1793 | vec<rtx_insn *> lra_constraint_insn_stack; |
1794 | |
1795 | /* Put INSN on the stack. If ALWAYS_UPDATE is true, always update the reg |
1796 | info for INSN, otherwise only update it if INSN is not already on the |
1797 | stack. */ |
1798 | static inline void |
1799 | lra_push_insn_1 (rtx_insn *insn, bool always_update) |
1800 | { |
1801 | unsigned int uid = INSN_UID (insn); |
1802 | if (always_update) |
1803 | lra_update_insn_regno_info (insn); |
1804 | if (uid >= SBITMAP_SIZE (lra_constraint_insn_stack_bitmap)) |
1805 | lra_constraint_insn_stack_bitmap = |
1806 | sbitmap_resize (lra_constraint_insn_stack_bitmap, 3 * uid / 2, 0); |
1807 | if (bitmap_bit_p (map: lra_constraint_insn_stack_bitmap, bitno: uid)) |
1808 | return; |
1809 | bitmap_set_bit (map: lra_constraint_insn_stack_bitmap, bitno: uid); |
1810 | if (! always_update) |
1811 | lra_update_insn_regno_info (insn); |
1812 | lra_constraint_insn_stack.safe_push (obj: insn); |
1813 | } |
1814 | |
1815 | /* Put INSN on the stack. */ |
1816 | void |
1817 | lra_push_insn (rtx_insn *insn) |
1818 | { |
1819 | lra_push_insn_1 (insn, always_update: false); |
1820 | } |
1821 | |
1822 | /* Put INSN on the stack and update its reg info. */ |
1823 | void |
1824 | lra_push_insn_and_update_insn_regno_info (rtx_insn *insn) |
1825 | { |
1826 | lra_push_insn_1 (insn, always_update: true); |
1827 | } |
1828 | |
1829 | /* Put insn with UID on the stack. */ |
1830 | void |
1831 | lra_push_insn_by_uid (unsigned int uid) |
1832 | { |
1833 | lra_push_insn (insn: lra_insn_recog_data[uid]->insn); |
1834 | } |
1835 | |
1836 | /* Take the last-inserted insns off the stack and return it. */ |
1837 | rtx_insn * |
1838 | lra_pop_insn (void) |
1839 | { |
1840 | rtx_insn *insn = lra_constraint_insn_stack.pop (); |
1841 | bitmap_clear_bit (map: lra_constraint_insn_stack_bitmap, bitno: INSN_UID (insn)); |
1842 | return insn; |
1843 | } |
1844 | |
1845 | /* Return the current size of the insn stack. */ |
1846 | unsigned int |
1847 | lra_insn_stack_length (void) |
1848 | { |
1849 | return lra_constraint_insn_stack.length (); |
1850 | } |
1851 | |
1852 | /* Push insns FROM to TO (excluding it) going in reverse order. */ |
1853 | static void |
1854 | push_insns (rtx_insn *from, rtx_insn *to) |
1855 | { |
1856 | rtx_insn *insn; |
1857 | |
1858 | if (from == NULL_RTX) |
1859 | return; |
1860 | for (insn = from; insn != to; insn = PREV_INSN (insn)) |
1861 | if (INSN_P (insn)) |
1862 | lra_push_insn (insn); |
1863 | } |
1864 | |
1865 | /* Set up and return sp offset for insns in range [FROM, LAST]. The offset is |
1866 | taken from the next BB insn after LAST or zero if there in such |
1867 | insn. */ |
1868 | static poly_int64 |
1869 | setup_sp_offset (rtx_insn *from, rtx_insn *last) |
1870 | { |
1871 | rtx_insn *before = next_nonnote_nondebug_insn_bb (last); |
1872 | poly_int64 offset = (before == NULL_RTX || ! INSN_P (before) |
1873 | ? 0 : lra_get_insn_recog_data (insn: before)->sp_offset); |
1874 | |
1875 | for (rtx_insn *insn = from; insn != NEXT_INSN (insn: last); insn = NEXT_INSN (insn)) |
1876 | { |
1877 | lra_get_insn_recog_data (insn)->sp_offset = offset; |
1878 | offset = lra_update_sp_offset (PATTERN (insn), offset); |
1879 | } |
1880 | return offset; |
1881 | } |
1882 | |
1883 | /* Dump all func insns in a slim form. */ |
1884 | void |
1885 | lra_dump_insns (FILE *f) |
1886 | { |
1887 | dump_rtl_slim (f, get_insns (), NULL, -1, 0); |
1888 | } |
1889 | |
1890 | /* Dump all func insns in a slim form with TITLE when the dump file is open and |
1891 | lra_verbose >=7. */ |
1892 | void |
1893 | lra_dump_insns_if_possible (const char *title) |
1894 | { |
1895 | if (lra_dump_file == NULL || lra_verbose < 7) |
1896 | return; |
1897 | fprintf (stream: lra_dump_file, format: "%s:" , title); |
1898 | lra_dump_insns (f: lra_dump_file); |
1899 | } |
1900 | |
1901 | /* Emit insns BEFORE before INSN and insns AFTER after INSN. Put the |
1902 | insns onto the stack. Print about emitting the insns with |
1903 | TITLE. */ |
1904 | void |
1905 | lra_process_new_insns (rtx_insn *insn, rtx_insn *before, rtx_insn *after, |
1906 | const char *title) |
1907 | { |
1908 | if (before == NULL_RTX && after == NULL_RTX) |
1909 | return; |
1910 | if (lra_dump_file != NULL) |
1911 | { |
1912 | dump_insn_slim (lra_dump_file, insn); |
1913 | if (before != NULL_RTX) |
1914 | { |
1915 | fprintf (stream: lra_dump_file,format: " %s before:\n" , title); |
1916 | dump_rtl_slim (lra_dump_file, before, NULL, -1, 0); |
1917 | } |
1918 | } |
1919 | if (before != NULL_RTX) |
1920 | { |
1921 | if (cfun->can_throw_non_call_exceptions) |
1922 | copy_reg_eh_region_note_forward (insn, before, NULL); |
1923 | emit_insn_before (before, insn); |
1924 | poly_int64 old_sp_offset = lra_get_insn_recog_data (insn)->sp_offset; |
1925 | poly_int64 new_sp_offset = setup_sp_offset (from: before, last: PREV_INSN (insn)); |
1926 | if (maybe_ne (a: old_sp_offset, b: new_sp_offset)) |
1927 | { |
1928 | if (lra_dump_file != NULL) |
1929 | { |
1930 | fprintf (stream: lra_dump_file, format: " Changing sp offset from " ); |
1931 | print_dec (value: old_sp_offset, file: lra_dump_file); |
1932 | fprintf (stream: lra_dump_file, format: " to " ); |
1933 | print_dec (value: new_sp_offset, file: lra_dump_file); |
1934 | fprintf (stream: lra_dump_file, format: " for insn" ); |
1935 | dump_rtl_slim (lra_dump_file, insn, NULL, -1, 0); |
1936 | } |
1937 | lra_get_insn_recog_data (insn)->sp_offset = new_sp_offset; |
1938 | eliminate_regs_in_insn (insn, false, false, |
1939 | old_sp_offset - new_sp_offset); |
1940 | lra_push_insn (insn); |
1941 | } |
1942 | push_insns (from: PREV_INSN (insn), to: PREV_INSN (insn: before)); |
1943 | } |
1944 | if (after != NULL_RTX) |
1945 | { |
1946 | if (cfun->can_throw_non_call_exceptions) |
1947 | copy_reg_eh_region_note_forward (insn, after, NULL); |
1948 | if (! JUMP_P (insn)) |
1949 | { |
1950 | rtx_insn *last; |
1951 | |
1952 | if (lra_dump_file != NULL) |
1953 | { |
1954 | fprintf (stream: lra_dump_file, format: " %s after:\n" , title); |
1955 | dump_rtl_slim (lra_dump_file, after, NULL, -1, 0); |
1956 | } |
1957 | for (last = after; |
1958 | NEXT_INSN (insn: last) != NULL_RTX; |
1959 | last = NEXT_INSN (insn: last)) |
1960 | ; |
1961 | emit_insn_after (after, insn); |
1962 | push_insns (from: last, to: insn); |
1963 | setup_sp_offset (from: after, last); |
1964 | } |
1965 | else |
1966 | { |
1967 | /* Put output reload insns on successor BBs: */ |
1968 | edge_iterator ei; |
1969 | edge e; |
1970 | |
1971 | FOR_EACH_EDGE (e, ei, BLOCK_FOR_INSN (insn)->succs) |
1972 | if (e->dest != EXIT_BLOCK_PTR_FOR_FN (cfun)) |
1973 | { |
1974 | /* We already made the edge no-critical in ira.cc::ira */ |
1975 | lra_assert (!EDGE_CRITICAL_P (e)); |
1976 | rtx_insn *curr, *tmp = BB_HEAD (e->dest); |
1977 | if (LABEL_P (tmp)) |
1978 | tmp = NEXT_INSN (insn: tmp); |
1979 | if (NOTE_INSN_BASIC_BLOCK_P (tmp)) |
1980 | tmp = NEXT_INSN (insn: tmp); |
1981 | /* Do not put reload insns if it is the last BB |
1982 | without actual insns. */ |
1983 | if (tmp == NULL) |
1984 | continue; |
1985 | start_sequence (); |
1986 | for (curr = after; curr != NULL_RTX; curr = NEXT_INSN (insn: curr)) |
1987 | emit_insn (copy_insn (PATTERN (insn: curr))); |
1988 | rtx_insn *copy = get_insns (), *last = get_last_insn (); |
1989 | end_sequence (); |
1990 | if (lra_dump_file != NULL) |
1991 | { |
1992 | fprintf (stream: lra_dump_file, format: " %s after in bb%d:\n" , title, |
1993 | e->dest->index); |
1994 | dump_rtl_slim (lra_dump_file, copy, NULL, -1, 0); |
1995 | } |
1996 | /* Use the right emit func for setting up BB_END/BB_HEAD: */ |
1997 | if (BB_END (e->dest) == PREV_INSN (insn: tmp)) |
1998 | emit_insn_after_noloc (copy, PREV_INSN (insn: tmp), e->dest); |
1999 | else |
2000 | emit_insn_before_noloc (copy, tmp, e->dest); |
2001 | push_insns (from: last, to: PREV_INSN (insn: copy)); |
2002 | setup_sp_offset (from: copy, last); |
2003 | /* We can ignore BB live info here as it and reg notes |
2004 | will be updated before the next assignment |
2005 | sub-pass. */ |
2006 | } |
2007 | } |
2008 | } |
2009 | if (lra_dump_file != NULL) |
2010 | fprintf (stream: lra_dump_file, format: "\n" ); |
2011 | if (cfun->can_throw_non_call_exceptions) |
2012 | { |
2013 | rtx note = find_reg_note (insn, REG_EH_REGION, NULL_RTX); |
2014 | if (note && !insn_could_throw_p (insn)) |
2015 | remove_note (insn, note); |
2016 | } |
2017 | } |
2018 | |
2019 | |
2020 | /* Replace all references to register OLD_REGNO in *LOC with pseudo |
2021 | register NEW_REG. Try to simplify subreg of constant if SUBREG_P. |
2022 | DEBUG_P is if LOC is within a DEBUG_INSN. Return true if any |
2023 | change was made. */ |
2024 | bool |
2025 | lra_substitute_pseudo (rtx *loc, int old_regno, rtx new_reg, bool subreg_p, |
2026 | bool debug_p) |
2027 | { |
2028 | rtx x = *loc; |
2029 | bool result = false; |
2030 | enum rtx_code code; |
2031 | const char *fmt; |
2032 | int i, j; |
2033 | |
2034 | if (x == NULL_RTX) |
2035 | return false; |
2036 | |
2037 | code = GET_CODE (x); |
2038 | if (code == SUBREG && subreg_p) |
2039 | { |
2040 | rtx subst, inner = SUBREG_REG (x); |
2041 | /* Transform subreg of constant while we still have inner mode |
2042 | of the subreg. The subreg internal should not be an insn |
2043 | operand. */ |
2044 | if (REG_P (inner) && (int) REGNO (inner) == old_regno |
2045 | && CONSTANT_P (new_reg) |
2046 | && (subst = simplify_subreg (GET_MODE (x), op: new_reg, GET_MODE (inner), |
2047 | SUBREG_BYTE (x))) != NULL_RTX) |
2048 | { |
2049 | *loc = subst; |
2050 | return true; |
2051 | } |
2052 | |
2053 | } |
2054 | else if (code == REG && (int) REGNO (x) == old_regno) |
2055 | { |
2056 | machine_mode mode = GET_MODE (x); |
2057 | machine_mode inner_mode = GET_MODE (new_reg); |
2058 | |
2059 | if (mode != inner_mode |
2060 | && ! (CONST_SCALAR_INT_P (new_reg) && SCALAR_INT_MODE_P (mode))) |
2061 | { |
2062 | poly_uint64 offset = 0; |
2063 | if (partial_subreg_p (outermode: mode, innermode: inner_mode) |
2064 | && SCALAR_INT_MODE_P (inner_mode)) |
2065 | offset = subreg_lowpart_offset (outermode: mode, innermode: inner_mode); |
2066 | if (debug_p) |
2067 | new_reg = gen_rtx_raw_SUBREG (mode, new_reg, offset); |
2068 | else |
2069 | new_reg = gen_rtx_SUBREG (mode, new_reg, offset); |
2070 | } |
2071 | *loc = new_reg; |
2072 | return true; |
2073 | } |
2074 | |
2075 | /* Scan all the operand sub-expressions. */ |
2076 | fmt = GET_RTX_FORMAT (code); |
2077 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) |
2078 | { |
2079 | if (fmt[i] == 'e') |
2080 | { |
2081 | if (debug_p |
2082 | && i == 0 |
2083 | && (code == SUBREG |
2084 | || code == ZERO_EXTEND |
2085 | || code == SIGN_EXTEND |
2086 | || code == FLOAT |
2087 | || code == UNSIGNED_FLOAT)) |
2088 | { |
2089 | rtx y = XEXP (x, 0); |
2090 | if (lra_substitute_pseudo (loc: &y, old_regno, |
2091 | new_reg, subreg_p, debug_p)) |
2092 | { |
2093 | result = true; |
2094 | if (CONST_SCALAR_INT_P (y)) |
2095 | { |
2096 | if (code == SUBREG) |
2097 | y = simplify_subreg (GET_MODE (x), op: y, |
2098 | GET_MODE (SUBREG_REG (x)), |
2099 | SUBREG_BYTE (x)); |
2100 | else |
2101 | y = simplify_unary_operation (code, GET_MODE (x), op: y, |
2102 | GET_MODE (XEXP (x, 0))); |
2103 | if (y) |
2104 | *loc = y; |
2105 | else |
2106 | *loc = gen_rtx_CLOBBER (GET_MODE (x), const0_rtx); |
2107 | } |
2108 | else |
2109 | XEXP (x, 0) = y; |
2110 | } |
2111 | } |
2112 | else if (lra_substitute_pseudo (loc: &XEXP (x, i), old_regno, |
2113 | new_reg, subreg_p, debug_p)) |
2114 | result = true; |
2115 | } |
2116 | else if (fmt[i] == 'E') |
2117 | { |
2118 | for (j = XVECLEN (x, i) - 1; j >= 0; j--) |
2119 | if (lra_substitute_pseudo (loc: &XVECEXP (x, i, j), old_regno, |
2120 | new_reg, subreg_p, debug_p)) |
2121 | result = true; |
2122 | } |
2123 | } |
2124 | return result; |
2125 | } |
2126 | |
2127 | /* Call lra_substitute_pseudo within an insn. Try to simplify subreg |
2128 | of constant if SUBREG_P. This won't update the insn ptr, just the |
2129 | contents of the insn. */ |
2130 | bool |
2131 | lra_substitute_pseudo_within_insn (rtx_insn *insn, int old_regno, |
2132 | rtx new_reg, bool subreg_p) |
2133 | { |
2134 | rtx loc = insn; |
2135 | return lra_substitute_pseudo (loc: &loc, old_regno, new_reg, subreg_p, |
2136 | DEBUG_INSN_P (insn)); |
2137 | } |
2138 | |
2139 | |
2140 | |
2141 | /* Return new register of the same mode as ORIGINAL of class ALL_REGS. |
2142 | Used in ira_remove_scratches. */ |
2143 | static rtx |
2144 | get_scratch_reg (rtx original) |
2145 | { |
2146 | return lra_create_new_reg (GET_MODE (original), original, rclass: ALL_REGS, |
2147 | NULL, NULL); |
2148 | } |
2149 | |
2150 | /* Remove all insn scratches in INSN. */ |
2151 | static void |
2152 | remove_insn_scratches (rtx_insn *insn) |
2153 | { |
2154 | if (ira_remove_insn_scratches (insn, all_p: true, dump_file: lra_dump_file, get_reg: get_scratch_reg)) |
2155 | df_insn_rescan (insn); |
2156 | } |
2157 | |
2158 | /* Remove all insn scratches in the current function. */ |
2159 | static void |
2160 | remove_scratches (void) |
2161 | { |
2162 | basic_block bb; |
2163 | rtx_insn *insn; |
2164 | |
2165 | FOR_EACH_BB_FN (bb, cfun) |
2166 | FOR_BB_INSNS (bb, insn) |
2167 | if (INSN_P (insn)) |
2168 | remove_insn_scratches (insn); |
2169 | } |
2170 | |
2171 | /* Function checks RTL for correctness. If FINAL_P is true, it is |
2172 | done at the end of LRA and the check is more rigorous. */ |
2173 | static void |
2174 | check_rtl (bool final_p) |
2175 | { |
2176 | basic_block bb; |
2177 | rtx_insn *insn; |
2178 | |
2179 | lra_assert (! final_p || reload_completed); |
2180 | FOR_EACH_BB_FN (bb, cfun) |
2181 | FOR_BB_INSNS (bb, insn) |
2182 | if (NONDEBUG_INSN_P (insn) |
2183 | && GET_CODE (PATTERN (insn)) != USE |
2184 | && GET_CODE (PATTERN (insn)) != CLOBBER |
2185 | && GET_CODE (PATTERN (insn)) != ASM_INPUT) |
2186 | { |
2187 | if (final_p) |
2188 | { |
2189 | extract_constrain_insn (insn); |
2190 | continue; |
2191 | } |
2192 | /* LRA code is based on assumption that all addresses can be |
2193 | correctly decomposed. LRA can generate reloads for |
2194 | decomposable addresses. The decomposition code checks the |
2195 | correctness of the addresses. So we don't need to check |
2196 | the addresses here. Don't call insn_invalid_p here, it can |
2197 | change the code at this stage. */ |
2198 | if (recog_memoized (insn) < 0 && asm_noperands (PATTERN (insn)) < 0) |
2199 | fatal_insn_not_found (insn); |
2200 | } |
2201 | } |
2202 | |
2203 | /* Determine if the current function has an exception receiver block |
2204 | that reaches the exit block via non-exceptional edges */ |
2205 | static bool |
2206 | has_nonexceptional_receiver (void) |
2207 | { |
2208 | edge e; |
2209 | edge_iterator ei; |
2210 | basic_block *tos, *worklist, bb; |
2211 | |
2212 | /* If we're not optimizing, then just err on the safe side. */ |
2213 | if (!optimize) |
2214 | return true; |
2215 | |
2216 | /* First determine which blocks can reach exit via normal paths. */ |
2217 | tos = worklist = XNEWVEC (basic_block, n_basic_blocks_for_fn (cfun) + 1); |
2218 | |
2219 | FOR_EACH_BB_FN (bb, cfun) |
2220 | bb->flags &= ~BB_REACHABLE; |
2221 | |
2222 | /* Place the exit block on our worklist. */ |
2223 | EXIT_BLOCK_PTR_FOR_FN (cfun)->flags |= BB_REACHABLE; |
2224 | *tos++ = EXIT_BLOCK_PTR_FOR_FN (cfun); |
2225 | |
2226 | /* Iterate: find everything reachable from what we've already seen. */ |
2227 | while (tos != worklist) |
2228 | { |
2229 | bb = *--tos; |
2230 | |
2231 | FOR_EACH_EDGE (e, ei, bb->preds) |
2232 | if (e->flags & EDGE_ABNORMAL) |
2233 | { |
2234 | free (ptr: worklist); |
2235 | return true; |
2236 | } |
2237 | else |
2238 | { |
2239 | basic_block src = e->src; |
2240 | |
2241 | if (!(src->flags & BB_REACHABLE)) |
2242 | { |
2243 | src->flags |= BB_REACHABLE; |
2244 | *tos++ = src; |
2245 | } |
2246 | } |
2247 | } |
2248 | free (ptr: worklist); |
2249 | /* No exceptional block reached exit unexceptionally. */ |
2250 | return false; |
2251 | } |
2252 | |
2253 | /* Remove all REG_DEAD and REG_UNUSED notes and regenerate REG_INC. |
2254 | We change pseudos by hard registers without notification of DF and |
2255 | that can make the notes obsolete. DF-infrastructure does not deal |
2256 | with REG_INC notes -- so we should regenerate them here. */ |
2257 | static void |
2258 | update_inc_notes (void) |
2259 | { |
2260 | rtx *pnote; |
2261 | basic_block bb; |
2262 | rtx_insn *insn; |
2263 | |
2264 | FOR_EACH_BB_FN (bb, cfun) |
2265 | FOR_BB_INSNS (bb, insn) |
2266 | if (NONDEBUG_INSN_P (insn)) |
2267 | { |
2268 | pnote = ®_NOTES (insn); |
2269 | while (*pnote != 0) |
2270 | { |
2271 | if (REG_NOTE_KIND (*pnote) == REG_DEAD |
2272 | || REG_NOTE_KIND (*pnote) == REG_UNUSED |
2273 | || REG_NOTE_KIND (*pnote) == REG_INC) |
2274 | *pnote = XEXP (*pnote, 1); |
2275 | else |
2276 | pnote = &XEXP (*pnote, 1); |
2277 | } |
2278 | |
2279 | if (AUTO_INC_DEC) |
2280 | add_auto_inc_notes (insn, PATTERN (insn)); |
2281 | } |
2282 | } |
2283 | |
2284 | /* Set to true while in LRA. */ |
2285 | bool lra_in_progress = false; |
2286 | |
2287 | /* Start of pseudo regnos before the LRA. */ |
2288 | int lra_new_regno_start; |
2289 | |
2290 | /* Start of reload pseudo regnos before the new spill pass. */ |
2291 | int lra_constraint_new_regno_start; |
2292 | |
2293 | /* Avoid spilling pseudos with regno more than the following value if |
2294 | it is possible. */ |
2295 | int lra_bad_spill_regno_start; |
2296 | |
2297 | /* A pseudo of Pmode. */ |
2298 | rtx lra_pmode_pseudo; |
2299 | |
2300 | /* Inheritance pseudo regnos before the new spill pass. */ |
2301 | bitmap_head lra_inheritance_pseudos; |
2302 | |
2303 | /* Split regnos before the new spill pass. */ |
2304 | bitmap_head lra_split_regs; |
2305 | |
2306 | /* Reload pseudo regnos before the new assignment pass which still can |
2307 | be spilled after the assignment pass as memory is also accepted in |
2308 | insns for the reload pseudos. */ |
2309 | bitmap_head lra_optional_reload_pseudos; |
2310 | |
2311 | /* Pseudo regnos used for subreg reloads before the new assignment |
2312 | pass. Such pseudos still can be spilled after the assignment |
2313 | pass. */ |
2314 | bitmap_head lra_subreg_reload_pseudos; |
2315 | |
2316 | /* File used for output of LRA debug information. */ |
2317 | FILE *lra_dump_file; |
2318 | |
2319 | /* How verbose should be the debug information. */ |
2320 | int lra_verbose; |
2321 | |
2322 | /* True if we split hard reg after the last constraint sub-pass. */ |
2323 | bool lra_hard_reg_split_p; |
2324 | |
2325 | /* True if we found an asm error. */ |
2326 | bool lra_asm_error_p; |
2327 | |
2328 | /* True if we should try spill into registers of different classes |
2329 | instead of memory. */ |
2330 | bool lra_reg_spill_p; |
2331 | |
2332 | /* Set up value LRA_REG_SPILL_P. */ |
2333 | static void |
2334 | setup_reg_spill_flag (void) |
2335 | { |
2336 | int cl, mode; |
2337 | |
2338 | if (targetm.spill_class != NULL) |
2339 | for (cl = 0; cl < (int) LIM_REG_CLASSES; cl++) |
2340 | for (mode = 0; mode < MAX_MACHINE_MODE; mode++) |
2341 | if (targetm.spill_class ((enum reg_class) cl, |
2342 | (machine_mode) mode) != NO_REGS) |
2343 | { |
2344 | lra_reg_spill_p = true; |
2345 | return; |
2346 | } |
2347 | lra_reg_spill_p = false; |
2348 | } |
2349 | |
2350 | /* True if the current function is too big to use regular algorithms |
2351 | in LRA. In other words, we should use simpler and faster algorithms |
2352 | in LRA. It also means we should not worry about generation code |
2353 | for caller saves. The value is set up in IRA. */ |
2354 | bool lra_simple_p; |
2355 | |
2356 | /* Major LRA entry function. F is a file should be used to dump LRA |
2357 | debug info with given verbosity. */ |
2358 | void |
2359 | lra (FILE *f, int verbose) |
2360 | { |
2361 | int i; |
2362 | bool live_p, inserted_p; |
2363 | |
2364 | lra_dump_file = f; |
2365 | lra_verbose = verbose; |
2366 | lra_asm_error_p = false; |
2367 | lra_pmode_pseudo = gen_reg_rtx (Pmode); |
2368 | |
2369 | timevar_push (tv: TV_LRA); |
2370 | |
2371 | /* Make sure that the last insn is a note. Some subsequent passes |
2372 | need it. */ |
2373 | emit_note (NOTE_INSN_DELETED); |
2374 | |
2375 | lra_no_alloc_regs = ira_no_alloc_regs; |
2376 | |
2377 | init_reg_info (); |
2378 | expand_reg_info (); |
2379 | |
2380 | init_insn_recog_data (); |
2381 | |
2382 | /* Some quick check on RTL generated by previous passes. */ |
2383 | if (flag_checking) |
2384 | check_rtl (final_p: false); |
2385 | |
2386 | lra_in_progress = true; |
2387 | |
2388 | lra_live_range_iter = lra_coalesce_iter = lra_constraint_iter = 0; |
2389 | lra_assignment_iter = lra_assignment_iter_after_spill = 0; |
2390 | lra_inheritance_iter = lra_undo_inheritance_iter = 0; |
2391 | lra_rematerialization_iter = 0; |
2392 | |
2393 | setup_reg_spill_flag (); |
2394 | |
2395 | /* Function remove_scratches can creates new pseudos for clobbers -- |
2396 | so set up lra_constraint_new_regno_start before its call to |
2397 | permit changing reg classes for pseudos created by this |
2398 | simplification. */ |
2399 | lra_constraint_new_regno_start = lra_new_regno_start = max_reg_num (); |
2400 | lra_bad_spill_regno_start = INT_MAX; |
2401 | remove_scratches (); |
2402 | |
2403 | /* A function that has a non-local label that can reach the exit |
2404 | block via non-exceptional paths must save all call-saved |
2405 | registers. */ |
2406 | if (cfun->has_nonlocal_label && has_nonexceptional_receiver ()) |
2407 | crtl->saves_all_registers = 1; |
2408 | |
2409 | if (crtl->saves_all_registers) |
2410 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) |
2411 | if (!crtl->abi->clobbers_full_reg_p (regno: i) |
2412 | && !fixed_regs[i] |
2413 | && !LOCAL_REGNO (i)) |
2414 | df_set_regs_ever_live (i, true); |
2415 | |
2416 | /* We don't DF from now and avoid its using because it is to |
2417 | expensive when a lot of RTL changes are made. */ |
2418 | df_set_flags (DF_NO_INSN_RESCAN); |
2419 | lra_constraint_insn_stack.create (nelems: get_max_uid ()); |
2420 | lra_constraint_insn_stack_bitmap = sbitmap_alloc (get_max_uid ()); |
2421 | bitmap_clear (lra_constraint_insn_stack_bitmap); |
2422 | lra_live_ranges_init (); |
2423 | lra_constraints_init (); |
2424 | lra_curr_reload_num = 0; |
2425 | push_insns (from: get_last_insn (), NULL); |
2426 | /* It is needed for the 1st coalescing. */ |
2427 | bitmap_initialize (head: &lra_inheritance_pseudos, obstack: ®_obstack); |
2428 | bitmap_initialize (head: &lra_split_regs, obstack: ®_obstack); |
2429 | bitmap_initialize (head: &lra_optional_reload_pseudos, obstack: ®_obstack); |
2430 | bitmap_initialize (head: &lra_subreg_reload_pseudos, obstack: ®_obstack); |
2431 | live_p = false; |
2432 | if (maybe_ne (a: get_frame_size (), b: 0) && crtl->stack_alignment_needed) |
2433 | /* If we have a stack frame, we must align it now. The stack size |
2434 | may be a part of the offset computation for register |
2435 | elimination. */ |
2436 | assign_stack_local (BLKmode, 0, crtl->stack_alignment_needed); |
2437 | lra_init_equiv (); |
2438 | for (;;) |
2439 | { |
2440 | for (;;) |
2441 | { |
2442 | bool reloads_p = lra_constraints (lra_constraint_iter == 0); |
2443 | /* Constraint transformations may result in that eliminable |
2444 | hard regs become uneliminable and pseudos which use them |
2445 | should be spilled. It is better to do it before pseudo |
2446 | assignments. |
2447 | |
2448 | For example, rs6000 can make |
2449 | RS6000_PIC_OFFSET_TABLE_REGNUM uneliminable if we started |
2450 | to use a constant pool. */ |
2451 | lra_eliminate (false, false); |
2452 | /* We should try to assign hard registers to scratches even |
2453 | if there were no RTL transformations in lra_constraints. |
2454 | Also we should check IRA assignments on the first |
2455 | iteration as they can be wrong because of early clobbers |
2456 | operands which are ignored in IRA. */ |
2457 | if (! reloads_p && lra_constraint_iter > 1) |
2458 | { |
2459 | /* Stack is not empty here only when there are changes |
2460 | during the elimination sub-pass. */ |
2461 | if (bitmap_empty_p (lra_constraint_insn_stack_bitmap)) |
2462 | break; |
2463 | else |
2464 | /* If there are no reloads but changing due |
2465 | elimination, restart the constraint sub-pass |
2466 | first. */ |
2467 | continue; |
2468 | } |
2469 | /* Do inheritance only for regular algorithms. */ |
2470 | if (! lra_simple_p) |
2471 | lra_inheritance (); |
2472 | if (live_p) |
2473 | lra_clear_live_ranges (); |
2474 | bool fails_p; |
2475 | lra_hard_reg_split_p = false; |
2476 | do |
2477 | { |
2478 | /* We need live ranges for lra_assign -- so build them. |
2479 | But don't remove dead insns or change global live |
2480 | info as we can undo inheritance transformations after |
2481 | inheritance pseudo assigning. */ |
2482 | lra_create_live_ranges (true, !lra_simple_p); |
2483 | live_p = true; |
2484 | /* If we don't spill non-reload and non-inheritance |
2485 | pseudos, there is no sense to run memory-memory move |
2486 | coalescing. If inheritance pseudos were spilled, the |
2487 | memory-memory moves involving them will be removed by |
2488 | pass undoing inheritance. */ |
2489 | if (lra_simple_p) |
2490 | lra_assign (fails_p); |
2491 | else |
2492 | { |
2493 | bool spill_p = !lra_assign (fails_p); |
2494 | |
2495 | if (lra_undo_inheritance ()) |
2496 | live_p = false; |
2497 | if (spill_p && ! fails_p) |
2498 | { |
2499 | if (! live_p) |
2500 | { |
2501 | lra_create_live_ranges (true, true); |
2502 | live_p = true; |
2503 | } |
2504 | if (lra_coalesce ()) |
2505 | live_p = false; |
2506 | } |
2507 | if (! live_p) |
2508 | lra_clear_live_ranges (); |
2509 | } |
2510 | if (fails_p) |
2511 | { |
2512 | /* It is a very rare case. It is the last hope to |
2513 | split a hard regno live range for a reload |
2514 | pseudo. */ |
2515 | if (live_p) |
2516 | lra_clear_live_ranges (); |
2517 | live_p = false; |
2518 | if (! lra_split_hard_reg_for ()) |
2519 | break; |
2520 | lra_hard_reg_split_p = true; |
2521 | } |
2522 | } |
2523 | while (fails_p && !lra_asm_error_p); |
2524 | if (! live_p) { |
2525 | /* We need the correct reg notes for work of constraint sub-pass. */ |
2526 | lra_create_live_ranges (true, true); |
2527 | live_p = true; |
2528 | } |
2529 | } |
2530 | /* Don't clear optional reloads bitmap until all constraints are |
2531 | satisfied as we need to differ them from regular reloads. */ |
2532 | bitmap_clear (&lra_optional_reload_pseudos); |
2533 | bitmap_clear (&lra_subreg_reload_pseudos); |
2534 | bitmap_clear (&lra_inheritance_pseudos); |
2535 | bitmap_clear (&lra_split_regs); |
2536 | if (! live_p) |
2537 | { |
2538 | /* We need full live info for spilling pseudos into |
2539 | registers instead of memory. */ |
2540 | lra_create_live_ranges (lra_reg_spill_p, true); |
2541 | live_p = true; |
2542 | } |
2543 | /* We should check necessity for spilling here as the above live |
2544 | range pass can remove spilled pseudos. */ |
2545 | if (! lra_need_for_spills_p ()) |
2546 | break; |
2547 | /* Now we know what pseudos should be spilled. Try to |
2548 | rematerialize them first. */ |
2549 | if (lra_remat ()) |
2550 | { |
2551 | /* We need full live info -- see the comment above. */ |
2552 | lra_create_live_ranges (lra_reg_spill_p, true); |
2553 | live_p = true; |
2554 | if (! lra_need_for_spills_p ()) |
2555 | { |
2556 | if (lra_need_for_scratch_reg_p ()) |
2557 | continue; |
2558 | break; |
2559 | } |
2560 | } |
2561 | lra_spill (); |
2562 | /* Assignment of stack slots changes elimination offsets for |
2563 | some eliminations. So update the offsets here. */ |
2564 | lra_eliminate (false, false); |
2565 | lra_constraint_new_regno_start = max_reg_num (); |
2566 | if (lra_bad_spill_regno_start == INT_MAX |
2567 | && lra_inheritance_iter > LRA_MAX_INHERITANCE_PASSES |
2568 | && lra_rematerialization_iter > LRA_MAX_REMATERIALIZATION_PASSES) |
2569 | /* After switching off inheritance and rematerialization |
2570 | passes, avoid spilling reload pseudos will be created to |
2571 | prevent LRA cycling in some complicated cases. */ |
2572 | lra_bad_spill_regno_start = lra_constraint_new_regno_start; |
2573 | lra_assignment_iter_after_spill = 0; |
2574 | } |
2575 | ira_restore_scratches (dump_file: lra_dump_file); |
2576 | lra_eliminate (true, false); |
2577 | lra_final_code_change (); |
2578 | lra_in_progress = false; |
2579 | if (live_p) |
2580 | lra_clear_live_ranges (); |
2581 | lra_live_ranges_finish (); |
2582 | lra_constraints_finish (); |
2583 | finish_reg_info (); |
2584 | sbitmap_free (map: lra_constraint_insn_stack_bitmap); |
2585 | lra_constraint_insn_stack.release (); |
2586 | finish_insn_recog_data (); |
2587 | regstat_free_n_sets_and_refs (); |
2588 | regstat_free_ri (); |
2589 | reload_completed = 1; |
2590 | update_inc_notes (); |
2591 | |
2592 | inserted_p = fixup_abnormal_edges (); |
2593 | |
2594 | /* We've possibly turned single trapping insn into multiple ones. */ |
2595 | if (cfun->can_throw_non_call_exceptions) |
2596 | { |
2597 | auto_sbitmap blocks (last_basic_block_for_fn (cfun)); |
2598 | bitmap_ones (blocks); |
2599 | find_many_sub_basic_blocks (blocks); |
2600 | } |
2601 | |
2602 | if (inserted_p) |
2603 | commit_edge_insertions (); |
2604 | |
2605 | /* Subsequent passes expect that rtl is unshared, so unshare everything |
2606 | here. */ |
2607 | unshare_all_rtl_again (get_insns ()); |
2608 | |
2609 | if (flag_checking) |
2610 | check_rtl (final_p: true); |
2611 | |
2612 | timevar_pop (tv: TV_LRA); |
2613 | } |
2614 | |
2615 | /* Called once per compiler to initialize LRA data once. */ |
2616 | void |
2617 | lra_init_once (void) |
2618 | { |
2619 | init_insn_code_data_once (); |
2620 | } |
2621 | |
2622 | /* Called once per compiler to finish LRA data which are initialize |
2623 | once. */ |
2624 | void |
2625 | lra_finish_once (void) |
2626 | { |
2627 | finish_insn_code_data_once (); |
2628 | } |
2629 | |