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55a2c322 | 1 | /* Build live ranges for pseudos. |
a945c346 | 2 | Copyright (C) 2010-2024 Free Software Foundation, Inc. |
55a2c322 VM |
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 | /* This file contains code to build pseudo live-ranges (analogous | |
23 | structures used in IRA, so read comments about the live-ranges | |
24 | there) and other info necessary for other passes to assign | |
25 | hard-registers to pseudos, coalesce the spilled pseudos, and assign | |
26 | stack memory slots to spilled pseudos. */ | |
27 | ||
28 | #include "config.h" | |
29 | #include "system.h" | |
30 | #include "coretypes.h" | |
c7131fb2 | 31 | #include "backend.h" |
55a2c322 | 32 | #include "rtl.h" |
957060b5 AM |
33 | #include "tree.h" |
34 | #include "predict.h" | |
c7131fb2 | 35 | #include "df.h" |
4d0cdd0c | 36 | #include "memmodel.h" |
55a2c322 VM |
37 | #include "tm_p.h" |
38 | #include "insn-config.h" | |
957060b5 AM |
39 | #include "regs.h" |
40 | #include "ira.h" | |
55a2c322 | 41 | #include "recog.h" |
60393bbc | 42 | #include "cfganal.h" |
55a2c322 VM |
43 | #include "sparseset.h" |
44 | #include "lra-int.h" | |
80ec73f4 | 45 | #include "target.h" |
5a5a3bc5 | 46 | #include "function-abi.h" |
55a2c322 VM |
47 | |
48 | /* Program points are enumerated by numbers from range | |
49 | 0..LRA_LIVE_MAX_POINT-1. There are approximately two times more | |
50 | program points than insns. Program points are places in the | |
51 | program where liveness info can be changed. In most general case | |
52 | (there are more complicated cases too) some program points | |
53 | correspond to places where input operand dies and other ones | |
54 | correspond to places where output operands are born. */ | |
55 | int lra_live_max_point; | |
56 | ||
57 | /* Accumulated execution frequency of all references for each hard | |
58 | register. */ | |
59 | int lra_hard_reg_usage[FIRST_PSEUDO_REGISTER]; | |
60 | ||
61 | /* A global flag whose true value says to build live ranges for all | |
62 | pseudos, otherwise the live ranges only for pseudos got memory is | |
63 | build. True value means also building copies and setting up hard | |
64 | register preferences. The complete info is necessary only for the | |
65 | assignment pass. The complete info is not needed for the | |
66 | coalescing and spill passes. */ | |
67 | static bool complete_info_p; | |
68 | ||
69 | /* Pseudos live at current point in the RTL scan. */ | |
70 | static sparseset pseudos_live; | |
71 | ||
72 | /* Pseudos probably living through calls and setjumps. As setjump is | |
73 | a call too, if a bit in PSEUDOS_LIVE_THROUGH_SETJUMPS is set up | |
74 | then the corresponding bit in PSEUDOS_LIVE_THROUGH_CALLS is set up | |
75 | too. These data are necessary for cases when only one subreg of a | |
76 | multi-reg pseudo is set up after a call. So we decide it is | |
77 | probably live when traversing bb backward. We are sure about | |
78 | living when we see its usage or definition of the pseudo. */ | |
79 | static sparseset pseudos_live_through_calls; | |
80 | static sparseset pseudos_live_through_setjumps; | |
81 | ||
82 | /* Set of hard regs (except eliminable ones) currently live. */ | |
83 | static HARD_REG_SET hard_regs_live; | |
84 | ||
85 | /* Set of pseudos and hard registers start living/dying in the current | |
86 | insn. These sets are used to update REG_DEAD and REG_UNUSED notes | |
874e50cb | 87 | in the insn. */ |
55a2c322 VM |
88 | static sparseset start_living, start_dying; |
89 | ||
90 | /* Set of pseudos and hard regs dead and unused in the current | |
91 | insn. */ | |
92 | static sparseset unused_set, dead_set; | |
93 | ||
4ab74a01 VM |
94 | /* Bitmap used for holding intermediate bitmap operation results. */ |
95 | static bitmap_head temp_bitmap; | |
96 | ||
55a2c322 | 97 | /* Pool for pseudo live ranges. */ |
fcb87c50 | 98 | static object_allocator<lra_live_range> lra_live_range_pool ("live ranges"); |
55a2c322 VM |
99 | |
100 | /* Free live range list LR. */ | |
101 | static void | |
102 | free_live_range_list (lra_live_range_t lr) | |
103 | { | |
104 | lra_live_range_t next; | |
105 | ||
106 | while (lr != NULL) | |
107 | { | |
108 | next = lr->next; | |
af121e82 | 109 | lra_live_range_pool.remove (lr); |
55a2c322 VM |
110 | lr = next; |
111 | } | |
112 | } | |
113 | ||
114 | /* Create and return pseudo live range with given attributes. */ | |
115 | static lra_live_range_t | |
116 | create_live_range (int regno, int start, int finish, lra_live_range_t next) | |
117 | { | |
af121e82 | 118 | lra_live_range_t p = lra_live_range_pool.allocate (); |
55a2c322 VM |
119 | p->regno = regno; |
120 | p->start = start; | |
121 | p->finish = finish; | |
122 | p->next = next; | |
123 | return p; | |
124 | } | |
125 | ||
126 | /* Copy live range R and return the result. */ | |
127 | static lra_live_range_t | |
128 | copy_live_range (lra_live_range_t r) | |
129 | { | |
af121e82 | 130 | return new (lra_live_range_pool) lra_live_range (*r); |
55a2c322 VM |
131 | } |
132 | ||
133 | /* Copy live range list given by its head R and return the result. */ | |
134 | lra_live_range_t | |
135 | lra_copy_live_range_list (lra_live_range_t r) | |
136 | { | |
137 | lra_live_range_t p, first, *chain; | |
138 | ||
139 | first = NULL; | |
140 | for (chain = &first; r != NULL; r = r->next) | |
141 | { | |
142 | p = copy_live_range (r); | |
143 | *chain = p; | |
144 | chain = &p->next; | |
145 | } | |
146 | return first; | |
147 | } | |
148 | ||
149 | /* Merge *non-intersected* ranges R1 and R2 and returns the result. | |
150 | The function maintains the order of ranges and tries to minimize | |
151 | size of the result range list. Ranges R1 and R2 may not be used | |
152 | after the call. */ | |
153 | lra_live_range_t | |
154 | lra_merge_live_ranges (lra_live_range_t r1, lra_live_range_t r2) | |
155 | { | |
fab27f52 | 156 | lra_live_range_t first, last; |
55a2c322 VM |
157 | |
158 | if (r1 == NULL) | |
159 | return r2; | |
160 | if (r2 == NULL) | |
161 | return r1; | |
162 | for (first = last = NULL; r1 != NULL && r2 != NULL;) | |
163 | { | |
164 | if (r1->start < r2->start) | |
fab27f52 MM |
165 | std::swap (r1, r2); |
166 | ||
55a2c322 VM |
167 | if (r1->start == r2->finish + 1) |
168 | { | |
169 | /* Joint ranges: merge r1 and r2 into r1. */ | |
170 | r1->start = r2->start; | |
fab27f52 | 171 | lra_live_range_t temp = r2; |
55a2c322 | 172 | r2 = r2->next; |
af121e82 | 173 | lra_live_range_pool.remove (temp); |
55a2c322 VM |
174 | } |
175 | else | |
176 | { | |
177 | gcc_assert (r2->finish + 1 < r1->start); | |
178 | /* Add r1 to the result. */ | |
179 | if (first == NULL) | |
180 | first = last = r1; | |
181 | else | |
182 | { | |
183 | last->next = r1; | |
184 | last = r1; | |
185 | } | |
186 | r1 = r1->next; | |
187 | } | |
188 | } | |
189 | if (r1 != NULL) | |
190 | { | |
191 | if (first == NULL) | |
192 | first = r1; | |
193 | else | |
194 | last->next = r1; | |
195 | } | |
196 | else | |
197 | { | |
198 | lra_assert (r2 != NULL); | |
199 | if (first == NULL) | |
200 | first = r2; | |
201 | else | |
202 | last->next = r2; | |
203 | } | |
204 | return first; | |
205 | } | |
206 | ||
207 | /* Return TRUE if live ranges R1 and R2 intersect. */ | |
208 | bool | |
209 | lra_intersected_live_ranges_p (lra_live_range_t r1, lra_live_range_t r2) | |
210 | { | |
211 | /* Remember the live ranges are always kept ordered. */ | |
212 | while (r1 != NULL && r2 != NULL) | |
213 | { | |
214 | if (r1->start > r2->finish) | |
215 | r1 = r1->next; | |
216 | else if (r2->start > r1->finish) | |
217 | r2 = r2->next; | |
218 | else | |
219 | return true; | |
220 | } | |
221 | return false; | |
222 | } | |
223 | ||
874e50cb PB |
224 | enum point_type { |
225 | DEF_POINT, | |
226 | USE_POINT | |
227 | }; | |
228 | ||
229 | /* Return TRUE if set A contains a pseudo register, otherwise, return FALSE. */ | |
230 | static bool | |
231 | sparseset_contains_pseudos_p (sparseset a) | |
232 | { | |
233 | int regno; | |
234 | EXECUTE_IF_SET_IN_SPARSESET (a, regno) | |
235 | if (!HARD_REGISTER_NUM_P (regno)) | |
236 | return true; | |
237 | return false; | |
238 | } | |
239 | ||
240 | /* Mark pseudo REGNO as living or dying at program point POINT, depending on | |
241 | whether TYPE is a definition or a use. If this is the first reference to | |
242 | REGNO that we've encountered, then create a new live range for it. */ | |
243 | ||
244 | static void | |
245 | update_pseudo_point (int regno, int point, enum point_type type) | |
246 | { | |
247 | lra_live_range_t p; | |
248 | ||
249 | /* Don't compute points for hard registers. */ | |
250 | if (HARD_REGISTER_NUM_P (regno)) | |
251 | return; | |
252 | ||
253 | if (complete_info_p || lra_get_regno_hard_regno (regno) < 0) | |
254 | { | |
255 | if (type == DEF_POINT) | |
256 | { | |
257 | if (sparseset_bit_p (pseudos_live, regno)) | |
258 | { | |
259 | p = lra_reg_info[regno].live_ranges; | |
260 | lra_assert (p != NULL); | |
261 | p->finish = point; | |
262 | } | |
263 | } | |
264 | else /* USE_POINT */ | |
265 | { | |
266 | if (!sparseset_bit_p (pseudos_live, regno) | |
267 | && ((p = lra_reg_info[regno].live_ranges) == NULL | |
268 | || (p->finish != point && p->finish + 1 != point))) | |
269 | lra_reg_info[regno].live_ranges | |
270 | = create_live_range (regno, point, -1, p); | |
271 | } | |
272 | } | |
273 | } | |
274 | ||
2de3d3c6 VM |
275 | /* The corresponding bitmaps of BB currently being processed. */ |
276 | static bitmap bb_killed_pseudos, bb_gen_pseudos; | |
277 | ||
0df92803 PB |
278 | /* Record hard register REGNO as now being live. It updates |
279 | living hard regs and START_LIVING. */ | |
55a2c322 | 280 | static void |
0df92803 | 281 | make_hard_regno_live (int regno) |
55a2c322 | 282 | { |
874e50cb | 283 | lra_assert (HARD_REGISTER_NUM_P (regno)); |
1bcb4c4f RS |
284 | if (TEST_HARD_REG_BIT (hard_regs_live, regno) |
285 | || TEST_HARD_REG_BIT (eliminable_regset, regno)) | |
55a2c322 VM |
286 | return; |
287 | SET_HARD_REG_BIT (hard_regs_live, regno); | |
288 | sparseset_set_bit (start_living, regno); | |
54178a01 | 289 | if (fixed_regs[regno] || TEST_HARD_REG_BIT (hard_regs_spilled_into, regno)) |
2de3d3c6 | 290 | bitmap_set_bit (bb_gen_pseudos, regno); |
55a2c322 VM |
291 | } |
292 | ||
0df92803 PB |
293 | /* Process the definition of hard register REGNO. This updates |
294 | hard_regs_live, START_DYING and conflict hard regs for living | |
a141f2d8 | 295 | pseudos. */ |
55a2c322 | 296 | static void |
a141f2d8 | 297 | make_hard_regno_dead (int regno) |
55a2c322 | 298 | { |
1bcb4c4f RS |
299 | if (TEST_HARD_REG_BIT (eliminable_regset, regno)) |
300 | return; | |
301 | ||
874e50cb | 302 | lra_assert (HARD_REGISTER_NUM_P (regno)); |
0df92803 PB |
303 | unsigned int i; |
304 | EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, i) | |
874e50cb PB |
305 | SET_HARD_REG_BIT (lra_reg_info[i].conflict_hard_regs, regno); |
306 | ||
307 | if (! TEST_HARD_REG_BIT (hard_regs_live, regno)) | |
308 | return; | |
55a2c322 | 309 | CLEAR_HARD_REG_BIT (hard_regs_live, regno); |
874e50cb | 310 | sparseset_set_bit (start_dying, regno); |
54178a01 | 311 | if (fixed_regs[regno] || TEST_HARD_REG_BIT (hard_regs_spilled_into, regno)) |
2de3d3c6 VM |
312 | { |
313 | bitmap_clear_bit (bb_gen_pseudos, regno); | |
314 | bitmap_set_bit (bb_killed_pseudos, regno); | |
315 | } | |
55a2c322 VM |
316 | } |
317 | ||
874e50cb | 318 | /* Mark pseudo REGNO as now being live and update START_LIVING. */ |
55a2c322 | 319 | static void |
874e50cb | 320 | mark_pseudo_live (int regno) |
55a2c322 | 321 | { |
874e50cb PB |
322 | lra_assert (!HARD_REGISTER_NUM_P (regno)); |
323 | if (sparseset_bit_p (pseudos_live, regno)) | |
324 | return; | |
55a2c322 | 325 | |
55a2c322 | 326 | sparseset_set_bit (pseudos_live, regno); |
55a2c322 VM |
327 | sparseset_set_bit (start_living, regno); |
328 | } | |
329 | ||
874e50cb | 330 | /* Mark pseudo REGNO as now being dead and update START_DYING. */ |
55a2c322 | 331 | static void |
874e50cb | 332 | mark_pseudo_dead (int regno) |
55a2c322 | 333 | { |
874e50cb | 334 | lra_assert (!HARD_REGISTER_NUM_P (regno)); |
44942965 | 335 | lra_reg_info[regno].conflict_hard_regs |= hard_regs_live; |
874e50cb PB |
336 | if (!sparseset_bit_p (pseudos_live, regno)) |
337 | return; | |
55a2c322 | 338 | |
55a2c322 VM |
339 | sparseset_clear_bit (pseudos_live, regno); |
340 | sparseset_set_bit (start_dying, regno); | |
55a2c322 VM |
341 | } |
342 | ||
874e50cb PB |
343 | /* Mark register REGNO (pseudo or hard register) in MODE as being live |
344 | and update BB_GEN_PSEUDOS. */ | |
345 | static void | |
346 | mark_regno_live (int regno, machine_mode mode) | |
55a2c322 VM |
347 | { |
348 | int last; | |
55a2c322 | 349 | |
874e50cb | 350 | if (HARD_REGISTER_NUM_P (regno)) |
55a2c322 | 351 | { |
4edd6298 | 352 | for (last = end_hard_regno (mode, regno); regno < last; regno++) |
0df92803 | 353 | make_hard_regno_live (regno); |
55a2c322 | 354 | } |
8160cd3e | 355 | else |
55a2c322 | 356 | { |
874e50cb | 357 | mark_pseudo_live (regno); |
18ea3d61 | 358 | bitmap_set_bit (bb_gen_pseudos, regno); |
55a2c322 | 359 | } |
55a2c322 VM |
360 | } |
361 | ||
362 | ||
874e50cb PB |
363 | /* Mark register REGNO (pseudo or hard register) in MODE as being dead |
364 | and update BB_GEN_PSEUDOS and BB_KILLED_PSEUDOS. */ | |
365 | static void | |
366 | mark_regno_dead (int regno, machine_mode mode) | |
55a2c322 VM |
367 | { |
368 | int last; | |
55a2c322 | 369 | |
874e50cb | 370 | if (HARD_REGISTER_NUM_P (regno)) |
55a2c322 | 371 | { |
4edd6298 | 372 | for (last = end_hard_regno (mode, regno); regno < last; regno++) |
a141f2d8 | 373 | make_hard_regno_dead (regno); |
55a2c322 | 374 | } |
8160cd3e | 375 | else |
55a2c322 | 376 | { |
874e50cb | 377 | mark_pseudo_dead (regno); |
18ea3d61 VM |
378 | bitmap_clear_bit (bb_gen_pseudos, regno); |
379 | bitmap_set_bit (bb_killed_pseudos, regno); | |
55a2c322 | 380 | } |
55a2c322 VM |
381 | } |
382 | ||
8160cd3e VM |
383 | \f |
384 | ||
385 | /* This page contains code for making global live analysis of pseudos. | |
386 | The code works only when pseudo live info is changed on a BB | |
387 | border. That might be a consequence of some global transformations | |
388 | in LRA, e.g. PIC pseudo reuse or rematerialization. */ | |
389 | ||
390 | /* Structure describing local BB data used for pseudo | |
391 | live-analysis. */ | |
6c1dae73 | 392 | class bb_data_pseudos |
8160cd3e | 393 | { |
6c1dae73 | 394 | public: |
8160cd3e VM |
395 | /* Basic block about which the below data are. */ |
396 | basic_block bb; | |
397 | bitmap_head killed_pseudos; /* pseudos killed in the BB. */ | |
398 | bitmap_head gen_pseudos; /* pseudos generated in the BB. */ | |
399 | }; | |
400 | ||
401 | /* Array for all BB data. Indexed by the corresponding BB index. */ | |
99b1c316 | 402 | typedef class bb_data_pseudos *bb_data_t; |
8160cd3e VM |
403 | |
404 | /* All basic block data are referred through the following array. */ | |
405 | static bb_data_t bb_data; | |
406 | ||
407 | /* Two small functions for access to the bb data. */ | |
408 | static inline bb_data_t | |
409 | get_bb_data (basic_block bb) | |
410 | { | |
411 | return &bb_data[(bb)->index]; | |
412 | } | |
413 | ||
414 | static inline bb_data_t | |
415 | get_bb_data_by_index (int index) | |
416 | { | |
417 | return &bb_data[index]; | |
418 | } | |
419 | ||
420 | /* Bitmap with all hard regs. */ | |
421 | static bitmap_head all_hard_regs_bitmap; | |
422 | ||
8160cd3e VM |
423 | /* The transfer function used by the DF equation solver to propagate |
424 | live info through block with BB_INDEX according to the following | |
425 | equation: | |
426 | ||
427 | bb.livein = (bb.liveout - bb.kill) OR bb.gen | |
428 | */ | |
429 | static bool | |
430 | live_trans_fun (int bb_index) | |
431 | { | |
432 | basic_block bb = get_bb_data_by_index (bb_index)->bb; | |
433 | bitmap bb_liveout = df_get_live_out (bb); | |
434 | bitmap bb_livein = df_get_live_in (bb); | |
435 | bb_data_t bb_info = get_bb_data (bb); | |
436 | ||
437 | bitmap_and_compl (&temp_bitmap, bb_liveout, &all_hard_regs_bitmap); | |
438 | return bitmap_ior_and_compl (bb_livein, &bb_info->gen_pseudos, | |
439 | &temp_bitmap, &bb_info->killed_pseudos); | |
440 | } | |
441 | ||
442 | /* The confluence function used by the DF equation solver to set up | |
443 | live info for a block BB without predecessor. */ | |
444 | static void | |
445 | live_con_fun_0 (basic_block bb) | |
446 | { | |
447 | bitmap_and_into (df_get_live_out (bb), &all_hard_regs_bitmap); | |
448 | } | |
449 | ||
450 | /* The confluence function used by the DF equation solver to propagate | |
451 | live info from successor to predecessor on edge E according to the | |
452 | following equation: | |
453 | ||
454 | bb.liveout = 0 for entry block | OR (livein of successors) | |
455 | */ | |
456 | static bool | |
457 | live_con_fun_n (edge e) | |
458 | { | |
459 | basic_block bb = e->src; | |
460 | basic_block dest = e->dest; | |
461 | bitmap bb_liveout = df_get_live_out (bb); | |
462 | bitmap dest_livein = df_get_live_in (dest); | |
cb8abb1c | 463 | |
8160cd3e VM |
464 | return bitmap_ior_and_compl_into (bb_liveout, |
465 | dest_livein, &all_hard_regs_bitmap); | |
466 | } | |
467 | ||
468 | /* Indexes of all function blocks. */ | |
469 | static bitmap_head all_blocks; | |
470 | ||
471 | /* Allocate and initialize data needed for global pseudo live | |
472 | analysis. */ | |
473 | static void | |
474 | initiate_live_solver (void) | |
475 | { | |
8160cd3e VM |
476 | bitmap_initialize (&all_hard_regs_bitmap, ®_obstack); |
477 | bitmap_set_range (&all_hard_regs_bitmap, 0, FIRST_PSEUDO_REGISTER); | |
99b1c316 | 478 | bb_data = XNEWVEC (class bb_data_pseudos, last_basic_block_for_fn (cfun)); |
8160cd3e VM |
479 | bitmap_initialize (&all_blocks, ®_obstack); |
480 | ||
481 | basic_block bb; | |
482 | FOR_ALL_BB_FN (bb, cfun) | |
483 | { | |
484 | bb_data_t bb_info = get_bb_data (bb); | |
485 | bb_info->bb = bb; | |
486 | bitmap_initialize (&bb_info->killed_pseudos, ®_obstack); | |
487 | bitmap_initialize (&bb_info->gen_pseudos, ®_obstack); | |
488 | bitmap_set_bit (&all_blocks, bb->index); | |
489 | } | |
490 | } | |
491 | ||
492 | /* Free all data needed for global pseudo live analysis. */ | |
493 | static void | |
494 | finish_live_solver (void) | |
495 | { | |
496 | basic_block bb; | |
497 | ||
498 | bitmap_clear (&all_blocks); | |
499 | FOR_ALL_BB_FN (bb, cfun) | |
500 | { | |
501 | bb_data_t bb_info = get_bb_data (bb); | |
502 | bitmap_clear (&bb_info->killed_pseudos); | |
503 | bitmap_clear (&bb_info->gen_pseudos); | |
504 | } | |
505 | free (bb_data); | |
506 | bitmap_clear (&all_hard_regs_bitmap); | |
8160cd3e VM |
507 | } |
508 | ||
509 | \f | |
510 | ||
55a2c322 | 511 | /* Insn currently scanned. */ |
cfa434f6 | 512 | static rtx_insn *curr_insn; |
55a2c322 VM |
513 | /* The insn data. */ |
514 | static lra_insn_recog_data_t curr_id; | |
515 | /* The insn static data. */ | |
516 | static struct lra_static_insn_data *curr_static_id; | |
517 | ||
55a2c322 | 518 | /* Vec containing execution frequencies of program points. */ |
9771b263 | 519 | static vec<int> point_freq_vec; |
55a2c322 VM |
520 | |
521 | /* The start of the above vector elements. */ | |
522 | int *lra_point_freq; | |
523 | ||
524 | /* Increment the current program point POINT to the next point which has | |
525 | execution frequency FREQ. */ | |
526 | static void | |
527 | next_program_point (int &point, int freq) | |
528 | { | |
9771b263 DN |
529 | point_freq_vec.safe_push (freq); |
530 | lra_point_freq = point_freq_vec.address (); | |
55a2c322 VM |
531 | point++; |
532 | } | |
533 | ||
534 | /* Update the preference of HARD_REGNO for pseudo REGNO by PROFIT. */ | |
535 | void | |
536 | lra_setup_reload_pseudo_preferenced_hard_reg (int regno, | |
537 | int hard_regno, int profit) | |
538 | { | |
539 | lra_assert (regno >= lra_constraint_new_regno_start); | |
540 | if (lra_reg_info[regno].preferred_hard_regno1 == hard_regno) | |
541 | lra_reg_info[regno].preferred_hard_regno_profit1 += profit; | |
542 | else if (lra_reg_info[regno].preferred_hard_regno2 == hard_regno) | |
543 | lra_reg_info[regno].preferred_hard_regno_profit2 += profit; | |
544 | else if (lra_reg_info[regno].preferred_hard_regno1 < 0) | |
545 | { | |
546 | lra_reg_info[regno].preferred_hard_regno1 = hard_regno; | |
547 | lra_reg_info[regno].preferred_hard_regno_profit1 = profit; | |
548 | } | |
549 | else if (lra_reg_info[regno].preferred_hard_regno2 < 0 | |
550 | || profit > lra_reg_info[regno].preferred_hard_regno_profit2) | |
551 | { | |
552 | lra_reg_info[regno].preferred_hard_regno2 = hard_regno; | |
553 | lra_reg_info[regno].preferred_hard_regno_profit2 = profit; | |
554 | } | |
555 | else | |
556 | return; | |
557 | /* Keep the 1st hard regno as more profitable. */ | |
558 | if (lra_reg_info[regno].preferred_hard_regno1 >= 0 | |
559 | && lra_reg_info[regno].preferred_hard_regno2 >= 0 | |
560 | && (lra_reg_info[regno].preferred_hard_regno_profit2 | |
561 | > lra_reg_info[regno].preferred_hard_regno_profit1)) | |
562 | { | |
6b4db501 MM |
563 | std::swap (lra_reg_info[regno].preferred_hard_regno1, |
564 | lra_reg_info[regno].preferred_hard_regno2); | |
565 | std::swap (lra_reg_info[regno].preferred_hard_regno_profit1, | |
566 | lra_reg_info[regno].preferred_hard_regno_profit2); | |
55a2c322 VM |
567 | } |
568 | if (lra_dump_file != NULL) | |
569 | { | |
570 | if ((hard_regno = lra_reg_info[regno].preferred_hard_regno1) >= 0) | |
571 | fprintf (lra_dump_file, | |
572 | " Hard reg %d is preferable by r%d with profit %d\n", | |
573 | hard_regno, regno, | |
574 | lra_reg_info[regno].preferred_hard_regno_profit1); | |
575 | if ((hard_regno = lra_reg_info[regno].preferred_hard_regno2) >= 0) | |
576 | fprintf (lra_dump_file, | |
577 | " Hard reg %d is preferable by r%d with profit %d\n", | |
578 | hard_regno, regno, | |
579 | lra_reg_info[regno].preferred_hard_regno_profit2); | |
580 | } | |
581 | } | |
582 | ||
a1e6ee38 RS |
583 | /* Check whether REGNO lives through calls and setjmps and clear |
584 | the corresponding bits in PSEUDOS_LIVE_THROUGH_CALLS and | |
585 | PSEUDOS_LIVE_THROUGH_SETJUMPS. All calls in the region described | |
586 | by PSEUDOS_LIVE_THROUGH_CALLS have the given ABI. */ | |
473574ee | 587 | |
55a2c322 | 588 | static inline void |
a1e6ee38 | 589 | check_pseudos_live_through_calls (int regno, const function_abi &abi) |
55a2c322 VM |
590 | { |
591 | if (! sparseset_bit_p (pseudos_live_through_calls, regno)) | |
592 | return; | |
473574ee | 593 | |
a1e6ee38 | 594 | machine_mode mode = PSEUDO_REGNO_MODE (regno); |
473574ee | 595 | |
55a2c322 | 596 | sparseset_clear_bit (pseudos_live_through_calls, regno); |
a1e6ee38 | 597 | lra_reg_info[regno].conflict_hard_regs |= abi.mode_clobbers (mode); |
55a2c322 VM |
598 | if (! sparseset_bit_p (pseudos_live_through_setjumps, regno)) |
599 | return; | |
600 | sparseset_clear_bit (pseudos_live_through_setjumps, regno); | |
601 | /* Don't allocate pseudos that cross setjmps or any call, if this | |
602 | function receives a nonlocal goto. */ | |
603 | SET_HARD_REG_SET (lra_reg_info[regno].conflict_hard_regs); | |
604 | } | |
605 | ||
584898ee VM |
606 | /* Return true if insn REG is an early clobber operand in alternative |
607 | NALT. Negative NALT means that we don't know the current insn | |
608 | alternative. So assume the worst. */ | |
609 | static inline bool | |
610 | reg_early_clobber_p (const struct lra_insn_reg *reg, int n_alt) | |
611 | { | |
a25f3e8e RS |
612 | return (n_alt == LRA_UNKNOWN_ALT |
613 | ? reg->early_clobber_alts != 0 | |
614 | : (n_alt != LRA_NON_CLOBBERED_ALT | |
615 | && TEST_BIT (reg->early_clobber_alts, n_alt))); | |
584898ee VM |
616 | } |
617 | ||
4bbd51af VM |
618 | /* Clear pseudo REGNO in SET or all hard registers of REGNO in MODE in SET. */ |
619 | static void | |
620 | clear_sparseset_regnos (sparseset set, int regno, enum machine_mode mode) | |
621 | { | |
622 | if (regno >= FIRST_PSEUDO_REGISTER) | |
623 | { | |
624 | sparseset_clear_bit (dead_set, regno); | |
625 | return; | |
626 | } | |
627 | for (int last = end_hard_regno (mode, regno); regno < last; regno++) | |
628 | sparseset_clear_bit (set, regno); | |
629 | } | |
630 | ||
631 | /* Return true if pseudo REGNO is in SET or all hard registers of REGNO in MODE | |
632 | are in SET. */ | |
633 | static bool | |
634 | regnos_in_sparseset_p (sparseset set, int regno, enum machine_mode mode) | |
635 | { | |
636 | if (regno >= FIRST_PSEUDO_REGISTER) | |
637 | return sparseset_bit_p (dead_set, regno); | |
638 | for (int last = end_hard_regno (mode, regno); regno < last; regno++) | |
639 | if (!sparseset_bit_p (set, regno)) | |
640 | return false; | |
641 | return true; | |
642 | } | |
643 | ||
55a2c322 VM |
644 | /* Process insns of the basic block BB to update pseudo live ranges, |
645 | pseudo hard register conflicts, and insn notes. We do it on | |
646 | backward scan of BB insns. CURR_POINT is the program point where | |
647 | BB ends. The function updates this counter and returns in | |
8160cd3e | 648 | CURR_POINT the program point where BB starts. The function also |
4ab74a01 | 649 | does local live info updates and can delete the dead insns if |
18ea3d61 | 650 | DEAD_INSN_P. It returns true if pseudo live info was |
8160cd3e VM |
651 | changed at the BB start. */ |
652 | static bool | |
18ea3d61 | 653 | process_bb_lives (basic_block bb, int &curr_point, bool dead_insn_p) |
55a2c322 VM |
654 | { |
655 | int i, regno, freq; | |
656 | unsigned int j; | |
657 | bitmap_iterator bi; | |
658 | bitmap reg_live_out; | |
659 | unsigned int px; | |
8160cd3e | 660 | rtx_insn *next; |
55a2c322 VM |
661 | rtx link, *link_loc; |
662 | bool need_curr_point_incr; | |
a1e6ee38 RS |
663 | /* Only has a meaningful value once we've seen a call. */ |
664 | function_abi last_call_abi = default_function_abi; | |
874e50cb | 665 | |
55a2c322 VM |
666 | reg_live_out = df_get_live_out (bb); |
667 | sparseset_clear (pseudos_live); | |
668 | sparseset_clear (pseudos_live_through_calls); | |
669 | sparseset_clear (pseudos_live_through_setjumps); | |
670 | REG_SET_TO_HARD_REG_SET (hard_regs_live, reg_live_out); | |
d15e5131 | 671 | hard_regs_live &= ~eliminable_regset; |
55a2c322 | 672 | EXECUTE_IF_SET_IN_BITMAP (reg_live_out, FIRST_PSEUDO_REGISTER, j, bi) |
874e50cb PB |
673 | { |
674 | update_pseudo_point (j, curr_point, USE_POINT); | |
675 | mark_pseudo_live (j); | |
676 | } | |
55a2c322 | 677 | |
18ea3d61 VM |
678 | bb_gen_pseudos = &get_bb_data (bb)->gen_pseudos; |
679 | bb_killed_pseudos = &get_bb_data (bb)->killed_pseudos; | |
680 | bitmap_clear (bb_gen_pseudos); | |
681 | bitmap_clear (bb_killed_pseudos); | |
55a2c322 VM |
682 | freq = REG_FREQ_FROM_BB (bb); |
683 | ||
684 | if (lra_dump_file != NULL) | |
685 | fprintf (lra_dump_file, " BB %d\n", bb->index); | |
686 | ||
687 | /* Scan the code of this basic block, noting which pseudos and hard | |
688 | regs are born or die. | |
689 | ||
690 | Note that this loop treats uninitialized values as live until the | |
691 | beginning of the block. For example, if an instruction uses | |
692 | (reg:DI foo), and only (subreg:SI (reg:DI foo) 0) is ever set, | |
693 | FOO will remain live until the beginning of the block. Likewise | |
694 | if FOO is not set at all. This is unnecessarily pessimistic, but | |
695 | it probably doesn't matter much in practice. */ | |
8160cd3e | 696 | FOR_BB_INSNS_REVERSE_SAFE (bb, curr_insn, next) |
55a2c322 VM |
697 | { |
698 | bool call_p; | |
584898ee | 699 | int n_alt, dst_regno, src_regno; |
55a2c322 | 700 | rtx set; |
17d184e5 | 701 | struct lra_insn_reg *reg; |
55a2c322 VM |
702 | |
703 | if (!NONDEBUG_INSN_P (curr_insn)) | |
704 | continue; | |
705 | ||
706 | curr_id = lra_get_insn_recog_data (curr_insn); | |
707 | curr_static_id = curr_id->insn_static_data; | |
584898ee | 708 | n_alt = curr_id->used_insn_alternative; |
55a2c322 | 709 | if (lra_dump_file != NULL) |
584898ee VM |
710 | fprintf (lra_dump_file, " Insn %u: point = %d, n_alt = %d\n", |
711 | INSN_UID (curr_insn), curr_point, n_alt); | |
55a2c322 | 712 | |
8160cd3e VM |
713 | set = single_set (curr_insn); |
714 | ||
18ea3d61 | 715 | if (dead_insn_p && set != NULL_RTX |
874e50cb | 716 | && REG_P (SET_DEST (set)) && !HARD_REGISTER_P (SET_DEST (set)) |
6750565c VM |
717 | && find_reg_note (curr_insn, REG_EH_REGION, NULL_RTX) == NULL_RTX |
718 | && ! may_trap_p (PATTERN (curr_insn)) | |
719 | /* Don't do premature remove of pic offset pseudo as we can | |
720 | start to use it after some reload generation. */ | |
721 | && (pic_offset_table_rtx == NULL_RTX | |
722 | || pic_offset_table_rtx != SET_DEST (set))) | |
8160cd3e | 723 | { |
18ea3d61 | 724 | bool remove_p = true; |
8160cd3e VM |
725 | |
726 | for (reg = curr_id->regs; reg != NULL; reg = reg->next) | |
25725506 VM |
727 | if (reg->type != OP_IN |
728 | && (reg->regno < FIRST_PSEUDO_REGISTER | |
729 | ? TEST_HARD_REG_BIT (hard_regs_live, reg->regno) | |
730 | : sparseset_bit_p (pseudos_live, reg->regno))) | |
8160cd3e | 731 | { |
18ea3d61 | 732 | remove_p = false; |
8160cd3e VM |
733 | break; |
734 | } | |
735 | for (reg = curr_static_id->hard_regs; reg != NULL; reg = reg->next) | |
17d184e5 | 736 | if (reg->type != OP_IN) |
8160cd3e | 737 | { |
18ea3d61 | 738 | remove_p = false; |
8160cd3e VM |
739 | break; |
740 | } | |
30dc1902 | 741 | |
18ea3d61 | 742 | if (remove_p && ! volatile_refs_p (PATTERN (curr_insn))) |
8160cd3e VM |
743 | { |
744 | dst_regno = REGNO (SET_DEST (set)); | |
745 | if (lra_dump_file != NULL) | |
746 | fprintf (lra_dump_file, " Deleting dead insn %u\n", | |
747 | INSN_UID (curr_insn)); | |
748 | lra_set_insn_deleted (curr_insn); | |
749 | if (lra_reg_info[dst_regno].nrefs == 0) | |
750 | { | |
751 | /* There might be some debug insns with the pseudo. */ | |
752 | unsigned int uid; | |
753 | rtx_insn *insn; | |
754 | ||
4ab74a01 VM |
755 | bitmap_copy (&temp_bitmap, &lra_reg_info[dst_regno].insn_bitmap); |
756 | EXECUTE_IF_SET_IN_BITMAP (&temp_bitmap, 0, uid, bi) | |
8160cd3e VM |
757 | { |
758 | insn = lra_insn_recog_data[uid]->insn; | |
759 | lra_substitute_pseudo_within_insn (insn, dst_regno, | |
ef87312e | 760 | SET_SRC (set), true); |
8160cd3e VM |
761 | lra_update_insn_regno_info (insn); |
762 | } | |
763 | } | |
764 | continue; | |
765 | } | |
766 | } | |
767 | ||
55a2c322 VM |
768 | /* Update max ref width and hard reg usage. */ |
769 | for (reg = curr_id->regs; reg != NULL; reg = reg->next) | |
3cbf012a | 770 | { |
4bbd51af | 771 | int regno = reg->regno; |
bd4288c0 | 772 | |
6e2e0ce6 | 773 | lra_update_biggest_mode (regno, reg->biggest_mode); |
874e50cb | 774 | if (HARD_REGISTER_NUM_P (regno)) |
4bbd51af | 775 | lra_hard_reg_usage[regno] += freq; |
3cbf012a | 776 | } |
55a2c322 VM |
777 | |
778 | call_p = CALL_P (curr_insn); | |
874e50cb PB |
779 | |
780 | /* If we have a simple register copy and the source reg is live after | |
781 | this instruction, then remove the source reg from the live set so | |
782 | that it will not conflict with the destination reg. */ | |
783 | rtx ignore_reg = non_conflicting_reg_copy_p (curr_insn); | |
784 | if (ignore_reg != NULL_RTX) | |
785 | { | |
786 | int ignore_regno = REGNO (ignore_reg); | |
787 | if (HARD_REGISTER_NUM_P (ignore_regno) | |
788 | && TEST_HARD_REG_BIT (hard_regs_live, ignore_regno)) | |
789 | CLEAR_HARD_REG_BIT (hard_regs_live, ignore_regno); | |
790 | else if (!HARD_REGISTER_NUM_P (ignore_regno) | |
791 | && sparseset_bit_p (pseudos_live, ignore_regno)) | |
792 | sparseset_clear_bit (pseudos_live, ignore_regno); | |
793 | else | |
794 | /* We don't need any special handling of the source reg if | |
795 | it is dead after this instruction. */ | |
796 | ignore_reg = NULL_RTX; | |
797 | } | |
798 | ||
3363daad VM |
799 | src_regno = (set != NULL_RTX && REG_P (SET_SRC (set)) |
800 | ? REGNO (SET_SRC (set)) : -1); | |
801 | dst_regno = (set != NULL_RTX && REG_P (SET_DEST (set)) | |
802 | ? REGNO (SET_DEST (set)) : -1); | |
55a2c322 | 803 | if (complete_info_p |
3363daad | 804 | && src_regno >= 0 && dst_regno >= 0 |
55a2c322 VM |
805 | /* Check that source regno does not conflict with |
806 | destination regno to exclude most impossible | |
807 | preferences. */ | |
874e50cb | 808 | && (((!HARD_REGISTER_NUM_P (src_regno) |
3363daad | 809 | && (! sparseset_bit_p (pseudos_live, src_regno) |
874e50cb | 810 | || (!HARD_REGISTER_NUM_P (dst_regno) |
3363daad VM |
811 | && lra_reg_val_equal_p (src_regno, |
812 | lra_reg_info[dst_regno].val, | |
813 | lra_reg_info[dst_regno].offset)))) | |
874e50cb | 814 | || (HARD_REGISTER_NUM_P (src_regno) |
55a2c322 VM |
815 | && ! TEST_HARD_REG_BIT (hard_regs_live, src_regno))) |
816 | /* It might be 'inheritance pseudo <- reload pseudo'. */ | |
817 | || (src_regno >= lra_constraint_new_regno_start | |
3363daad | 818 | && dst_regno >= lra_constraint_new_regno_start |
debd8f30 CLT |
819 | /* Remember to skip special cases where src/dest regnos are |
820 | the same, e.g. insn SET pattern has matching constraints | |
821 | like =r,0. */ | |
3363daad | 822 | && src_regno != dst_regno))) |
55a2c322 VM |
823 | { |
824 | int hard_regno = -1, regno = -1; | |
825 | ||
55a2c322 VM |
826 | if (dst_regno >= lra_constraint_new_regno_start |
827 | && src_regno >= lra_constraint_new_regno_start) | |
a42e72d1 VM |
828 | { |
829 | /* It might be still an original (non-reload) insn with | |
830 | one unused output and a constraint requiring to use | |
831 | the same reg for input/output operands. In this case | |
832 | dst_regno and src_regno have the same value, we don't | |
833 | need a misleading copy for this case. */ | |
834 | if (dst_regno != src_regno) | |
835 | lra_create_copy (dst_regno, src_regno, freq); | |
836 | } | |
55a2c322 VM |
837 | else if (dst_regno >= lra_constraint_new_regno_start) |
838 | { | |
874e50cb | 839 | if (!HARD_REGISTER_NUM_P (hard_regno = src_regno)) |
55a2c322 VM |
840 | hard_regno = reg_renumber[src_regno]; |
841 | regno = dst_regno; | |
842 | } | |
843 | else if (src_regno >= lra_constraint_new_regno_start) | |
844 | { | |
874e50cb | 845 | if (!HARD_REGISTER_NUM_P (hard_regno = dst_regno)) |
55a2c322 VM |
846 | hard_regno = reg_renumber[dst_regno]; |
847 | regno = src_regno; | |
848 | } | |
849 | if (regno >= 0 && hard_regno >= 0) | |
850 | lra_setup_reload_pseudo_preferenced_hard_reg | |
851 | (regno, hard_regno, freq); | |
852 | } | |
853 | ||
854 | sparseset_clear (start_living); | |
855 | ||
55a2c322 VM |
856 | /* Mark each defined value as live. We need to do this for |
857 | unused values because they still conflict with quantities | |
858 | that are live at the time of the definition. */ | |
859 | for (reg = curr_id->regs; reg != NULL; reg = reg->next) | |
17d184e5 RS |
860 | if (reg->type != OP_IN) |
861 | { | |
862 | update_pseudo_point (reg->regno, curr_point, USE_POINT); | |
863 | mark_regno_live (reg->regno, reg->biggest_mode); | |
864 | /* ??? Should be a no-op for unused registers. */ | |
865 | check_pseudos_live_through_calls (reg->regno, last_call_abi); | |
866 | } | |
55a2c322 VM |
867 | |
868 | for (reg = curr_static_id->hard_regs; reg != NULL; reg = reg->next) | |
869 | if (reg->type != OP_IN) | |
0df92803 | 870 | make_hard_regno_live (reg->regno); |
55a2c322 | 871 | |
9d86e84e VM |
872 | if (curr_id->arg_hard_regs != NULL) |
873 | for (i = 0; (regno = curr_id->arg_hard_regs[i]) >= 0; i++) | |
874e50cb | 874 | if (!HARD_REGISTER_NUM_P (regno)) |
9d86e84e | 875 | /* It is a clobber. */ |
0df92803 | 876 | make_hard_regno_live (regno - FIRST_PSEUDO_REGISTER); |
9d86e84e | 877 | |
55a2c322 VM |
878 | sparseset_copy (unused_set, start_living); |
879 | ||
880 | sparseset_clear (start_dying); | |
881 | ||
882 | /* See which defined values die here. */ | |
883 | for (reg = curr_id->regs; reg != NULL; reg = reg->next) | |
874e50cb | 884 | if (reg->type != OP_IN |
584898ee | 885 | && ! reg_early_clobber_p (reg, n_alt) && ! reg->subreg_p) |
874e50cb PB |
886 | { |
887 | if (reg->type == OP_OUT) | |
888 | update_pseudo_point (reg->regno, curr_point, DEF_POINT); | |
889 | mark_regno_dead (reg->regno, reg->biggest_mode); | |
890 | } | |
55a2c322 VM |
891 | |
892 | for (reg = curr_static_id->hard_regs; reg != NULL; reg = reg->next) | |
874e50cb | 893 | if (reg->type != OP_IN |
584898ee | 894 | && ! reg_early_clobber_p (reg, n_alt) && ! reg->subreg_p) |
a141f2d8 | 895 | make_hard_regno_dead (reg->regno); |
55a2c322 | 896 | |
9d86e84e VM |
897 | if (curr_id->arg_hard_regs != NULL) |
898 | for (i = 0; (regno = curr_id->arg_hard_regs[i]) >= 0; i++) | |
874e50cb | 899 | if (!HARD_REGISTER_NUM_P (regno)) |
a141f2d8 PB |
900 | /* It is a clobber. */ |
901 | make_hard_regno_dead (regno - FIRST_PSEUDO_REGISTER); | |
9d86e84e | 902 | |
55a2c322 VM |
903 | if (call_p) |
904 | { | |
a1e6ee38 | 905 | function_abi call_abi = insn_callee_abi (curr_insn); |
473574ee | 906 | |
a1e6ee38 RS |
907 | if (last_call_abi != call_abi) |
908 | EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, j) | |
909 | check_pseudos_live_through_calls (j, last_call_abi); | |
910 | ||
911 | last_call_abi = call_abi; | |
10e1bdb2 | 912 | |
55a2c322 VM |
913 | sparseset_ior (pseudos_live_through_calls, |
914 | pseudos_live_through_calls, pseudos_live); | |
915 | if (cfun->has_nonlocal_label | |
82957a73 PB |
916 | || (!targetm.setjmp_preserves_nonvolatile_regs_p () |
917 | && (find_reg_note (curr_insn, REG_SETJMP, NULL_RTX) | |
918 | != NULL_RTX))) | |
55a2c322 VM |
919 | sparseset_ior (pseudos_live_through_setjumps, |
920 | pseudos_live_through_setjumps, pseudos_live); | |
921 | } | |
922 | ||
923 | /* Increment the current program point if we must. */ | |
874e50cb PB |
924 | if (sparseset_contains_pseudos_p (unused_set) |
925 | || sparseset_contains_pseudos_p (start_dying)) | |
55a2c322 VM |
926 | next_program_point (curr_point, freq); |
927 | ||
874e50cb PB |
928 | /* If we removed the source reg from a simple register copy from the |
929 | live set above, then add it back now so we don't accidentally add | |
930 | it to the start_living set below. */ | |
931 | if (ignore_reg != NULL_RTX) | |
932 | { | |
933 | int ignore_regno = REGNO (ignore_reg); | |
934 | if (HARD_REGISTER_NUM_P (ignore_regno)) | |
935 | SET_HARD_REG_BIT (hard_regs_live, ignore_regno); | |
936 | else | |
937 | sparseset_set_bit (pseudos_live, ignore_regno); | |
938 | } | |
55a2c322 | 939 | |
874e50cb | 940 | sparseset_clear (start_living); |
55a2c322 VM |
941 | |
942 | /* Mark each used value as live. */ | |
943 | for (reg = curr_id->regs; reg != NULL; reg = reg->next) | |
874e50cb | 944 | if (reg->type != OP_OUT) |
55a2c322 | 945 | { |
874e50cb PB |
946 | if (reg->type == OP_IN) |
947 | update_pseudo_point (reg->regno, curr_point, USE_POINT); | |
948 | mark_regno_live (reg->regno, reg->biggest_mode); | |
a1e6ee38 | 949 | check_pseudos_live_through_calls (reg->regno, last_call_abi); |
55a2c322 VM |
950 | } |
951 | ||
952 | for (reg = curr_static_id->hard_regs; reg != NULL; reg = reg->next) | |
874e50cb | 953 | if (reg->type != OP_OUT) |
0df92803 | 954 | make_hard_regno_live (reg->regno); |
55a2c322 VM |
955 | |
956 | if (curr_id->arg_hard_regs != NULL) | |
a141f2d8 | 957 | /* Make argument hard registers live. */ |
55a2c322 | 958 | for (i = 0; (regno = curr_id->arg_hard_regs[i]) >= 0; i++) |
874e50cb | 959 | if (HARD_REGISTER_NUM_P (regno)) |
0df92803 | 960 | make_hard_regno_live (regno); |
55a2c322 VM |
961 | |
962 | sparseset_and_compl (dead_set, start_living, start_dying); | |
963 | ||
874e50cb PB |
964 | sparseset_clear (start_dying); |
965 | ||
55a2c322 VM |
966 | /* Mark early clobber outputs dead. */ |
967 | for (reg = curr_id->regs; reg != NULL; reg = reg->next) | |
874e50cb | 968 | if (reg->type != OP_IN |
584898ee | 969 | && reg_early_clobber_p (reg, n_alt) && ! reg->subreg_p) |
874e50cb PB |
970 | { |
971 | if (reg->type == OP_OUT) | |
972 | update_pseudo_point (reg->regno, curr_point, DEF_POINT); | |
973 | mark_regno_dead (reg->regno, reg->biggest_mode); | |
974 | ||
975 | /* We're done processing inputs, so make sure early clobber | |
976 | operands that are both inputs and outputs are still live. */ | |
977 | if (reg->type == OP_INOUT) | |
978 | mark_regno_live (reg->regno, reg->biggest_mode); | |
979 | } | |
55a2c322 VM |
980 | |
981 | for (reg = curr_static_id->hard_regs; reg != NULL; reg = reg->next) | |
874e50cb | 982 | if (reg->type != OP_IN |
584898ee | 983 | && reg_early_clobber_p (reg, n_alt) && ! reg->subreg_p) |
75214935 VM |
984 | { |
985 | struct lra_insn_reg *reg2; | |
874e50cb | 986 | |
75214935 VM |
987 | /* We can have early clobbered non-operand hard reg and |
988 | the same hard reg as an insn input. Don't make hard | |
989 | reg dead before the insns. */ | |
abf95304 | 990 | for (reg2 = curr_static_id->hard_regs; reg2 != NULL; reg2 = reg2->next) |
75214935 VM |
991 | if (reg2->type != OP_OUT && reg2->regno == reg->regno) |
992 | break; | |
993 | if (reg2 == NULL) | |
a141f2d8 | 994 | make_hard_regno_dead (reg->regno); |
75214935 | 995 | } |
55a2c322 | 996 | |
874e50cb PB |
997 | /* Increment the current program point if we must. */ |
998 | if (sparseset_contains_pseudos_p (dead_set) | |
999 | || sparseset_contains_pseudos_p (start_dying)) | |
55a2c322 VM |
1000 | next_program_point (curr_point, freq); |
1001 | ||
1002 | /* Update notes. */ | |
1003 | for (link_loc = ®_NOTES (curr_insn); (link = *link_loc) != NULL_RTX;) | |
1004 | { | |
1005 | if (REG_NOTE_KIND (link) != REG_DEAD | |
1006 | && REG_NOTE_KIND (link) != REG_UNUSED) | |
1007 | ; | |
1008 | else if (REG_P (XEXP (link, 0))) | |
1009 | { | |
4bbd51af VM |
1010 | rtx note_reg = XEXP (link, 0); |
1011 | int note_regno = REGNO (note_reg); | |
1012 | ||
55a2c322 | 1013 | if ((REG_NOTE_KIND (link) == REG_DEAD |
4bbd51af VM |
1014 | && ! regnos_in_sparseset_p (dead_set, note_regno, |
1015 | GET_MODE (note_reg))) | |
55a2c322 | 1016 | || (REG_NOTE_KIND (link) == REG_UNUSED |
4bbd51af VM |
1017 | && ! regnos_in_sparseset_p (unused_set, note_regno, |
1018 | GET_MODE (note_reg)))) | |
55a2c322 VM |
1019 | { |
1020 | *link_loc = XEXP (link, 1); | |
1021 | continue; | |
1022 | } | |
1023 | if (REG_NOTE_KIND (link) == REG_DEAD) | |
4bbd51af VM |
1024 | clear_sparseset_regnos (dead_set, note_regno, |
1025 | GET_MODE (note_reg)); | |
55a2c322 | 1026 | else if (REG_NOTE_KIND (link) == REG_UNUSED) |
4bbd51af VM |
1027 | clear_sparseset_regnos (unused_set, note_regno, |
1028 | GET_MODE (note_reg)); | |
55a2c322 VM |
1029 | } |
1030 | link_loc = &XEXP (link, 1); | |
1031 | } | |
1032 | EXECUTE_IF_SET_IN_SPARSESET (dead_set, j) | |
1033 | add_reg_note (curr_insn, REG_DEAD, regno_reg_rtx[j]); | |
1034 | EXECUTE_IF_SET_IN_SPARSESET (unused_set, j) | |
1035 | add_reg_note (curr_insn, REG_UNUSED, regno_reg_rtx[j]); | |
1036 | } | |
1037 | ||
55a2c322 | 1038 | if (bb_has_eh_pred (bb)) |
e83714f6 RS |
1039 | /* Any pseudos that are currently live conflict with the eh_return |
1040 | data registers. For liveness purposes, these registers are set | |
1041 | by artificial definitions at the start of the BB, so are not | |
1042 | actually live on entry. */ | |
55a2c322 VM |
1043 | for (j = 0; ; ++j) |
1044 | { | |
1045 | unsigned int regno = EH_RETURN_DATA_REGNO (j); | |
1046 | ||
1047 | if (regno == INVALID_REGNUM) | |
1048 | break; | |
e83714f6 | 1049 | |
0df92803 | 1050 | make_hard_regno_live (regno); |
e83714f6 | 1051 | make_hard_regno_dead (regno); |
55a2c322 | 1052 | } |
55a2c322 VM |
1053 | |
1054 | /* Pseudos can't go in stack regs at the start of a basic block that | |
a1e6ee38 RS |
1055 | is reached by an abnormal edge. Likewise for registers that are at |
1056 | least partly call clobbered, because caller-save, fixup_abnormal_edges | |
1057 | and possibly the table driven EH machinery are not quite ready to | |
1058 | handle such pseudos live across such edges. */ | |
55a2c322 VM |
1059 | if (bb_has_abnormal_pred (bb)) |
1060 | { | |
d11676de RS |
1061 | HARD_REG_SET clobbers; |
1062 | ||
1063 | CLEAR_HARD_REG_SET (clobbers); | |
55a2c322 VM |
1064 | #ifdef STACK_REGS |
1065 | EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, px) | |
1066 | lra_reg_info[px].no_stack_p = true; | |
1067 | for (px = FIRST_STACK_REG; px <= LAST_STACK_REG; px++) | |
d11676de | 1068 | SET_HARD_REG_BIT (clobbers, px); |
55a2c322 VM |
1069 | #endif |
1070 | /* No need to record conflicts for call clobbered regs if we | |
1071 | have nonlocal labels around, as we don't ever try to | |
1072 | allocate such regs in this case. */ | |
f1544089 MP |
1073 | if (!cfun->has_nonlocal_label |
1074 | && has_abnormal_call_or_eh_pred_edge_p (bb)) | |
874e50cb | 1075 | for (px = 0; HARD_REGISTER_NUM_P (px); px++) |
a1e6ee38 | 1076 | if (eh_edge_abi.clobbers_at_least_part_of_reg_p (px) |
1d6cc2e4 VM |
1077 | #ifdef REAL_PIC_OFFSET_TABLE_REGNUM |
1078 | /* We should create a conflict of PIC pseudo with PIC | |
1079 | hard reg as PIC hard reg can have a wrong value after | |
1080 | jump described by the abnormal edge. In this case we | |
67914693 | 1081 | cannot allocate PIC hard reg to PIC pseudo as PIC |
1d6cc2e4 VM |
1082 | pseudo will also have a wrong value. */ |
1083 | || (px == REAL_PIC_OFFSET_TABLE_REGNUM | |
1084 | && pic_offset_table_rtx != NULL_RTX | |
874e50cb | 1085 | && !HARD_REGISTER_P (pic_offset_table_rtx)) |
1d6cc2e4 VM |
1086 | #endif |
1087 | ) | |
d11676de RS |
1088 | SET_HARD_REG_BIT (clobbers, px); |
1089 | ||
1090 | clobbers &= ~hard_regs_live; | |
1091 | for (px = 0; HARD_REGISTER_NUM_P (px); px++) | |
1092 | if (TEST_HARD_REG_BIT (clobbers, px)) | |
1093 | { | |
0df92803 | 1094 | make_hard_regno_live (px); |
d11676de RS |
1095 | make_hard_regno_dead (px); |
1096 | } | |
55a2c322 VM |
1097 | } |
1098 | ||
d11676de RS |
1099 | bool live_change_p = false; |
1100 | /* Check if bb border live info was changed. */ | |
1101 | unsigned int live_pseudos_num = 0; | |
1102 | EXECUTE_IF_SET_IN_BITMAP (df_get_live_in (bb), | |
1103 | FIRST_PSEUDO_REGISTER, j, bi) | |
1104 | { | |
1105 | live_pseudos_num++; | |
1106 | if (! sparseset_bit_p (pseudos_live, j)) | |
1107 | { | |
1108 | live_change_p = true; | |
1109 | if (lra_dump_file != NULL) | |
1110 | fprintf (lra_dump_file, | |
1111 | " r%d is removed as live at bb%d start\n", j, bb->index); | |
1112 | break; | |
1113 | } | |
1114 | } | |
1115 | if (! live_change_p | |
1116 | && sparseset_cardinality (pseudos_live) != live_pseudos_num) | |
1117 | { | |
1118 | live_change_p = true; | |
1119 | if (lra_dump_file != NULL) | |
1120 | EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, j) | |
1121 | if (! bitmap_bit_p (df_get_live_in (bb), j)) | |
1122 | fprintf (lra_dump_file, | |
1123 | " r%d is added to live at bb%d start\n", j, bb->index); | |
1124 | } | |
55a2c322 VM |
1125 | /* See if we'll need an increment at the end of this basic block. |
1126 | An increment is needed if the PSEUDOS_LIVE set is not empty, | |
1127 | to make sure the finish points are set up correctly. */ | |
1128 | need_curr_point_incr = (sparseset_cardinality (pseudos_live) > 0); | |
1129 | ||
1130 | EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, i) | |
874e50cb PB |
1131 | { |
1132 | update_pseudo_point (i, curr_point, DEF_POINT); | |
1133 | mark_pseudo_dead (i); | |
1134 | } | |
55a2c322 VM |
1135 | |
1136 | EXECUTE_IF_SET_IN_BITMAP (df_get_live_in (bb), FIRST_PSEUDO_REGISTER, j, bi) | |
1137 | { | |
1138 | if (sparseset_cardinality (pseudos_live_through_calls) == 0) | |
1139 | break; | |
1140 | if (sparseset_bit_p (pseudos_live_through_calls, j)) | |
a1e6ee38 | 1141 | check_pseudos_live_through_calls (j, last_call_abi); |
55a2c322 | 1142 | } |
cb8abb1c | 1143 | |
d11676de RS |
1144 | for (i = 0; HARD_REGISTER_NUM_P (i); ++i) |
1145 | { | |
1146 | if (!TEST_HARD_REG_BIT (hard_regs_live, i)) | |
1147 | continue; | |
1148 | ||
1149 | if (!TEST_HARD_REG_BIT (hard_regs_spilled_into, i)) | |
1150 | continue; | |
1151 | ||
1152 | if (bitmap_bit_p (df_get_live_in (bb), i)) | |
1153 | continue; | |
1154 | ||
1155 | live_change_p = true; | |
1156 | if (lra_dump_file) | |
1157 | fprintf (lra_dump_file, | |
1158 | " hard reg r%d is added to live at bb%d start\n", i, | |
1159 | bb->index); | |
1160 | bitmap_set_bit (df_get_live_in (bb), i); | |
1161 | } | |
1162 | ||
55a2c322 VM |
1163 | if (need_curr_point_incr) |
1164 | next_program_point (curr_point, freq); | |
8160cd3e VM |
1165 | |
1166 | return live_change_p; | |
55a2c322 VM |
1167 | } |
1168 | ||
1169 | /* Compress pseudo live ranges by removing program points where | |
1170 | nothing happens. Complexity of many algorithms in LRA is linear | |
1171 | function of program points number. To speed up the code we try to | |
1172 | minimize the number of the program points here. */ | |
1173 | static void | |
1174 | remove_some_program_points_and_update_live_ranges (void) | |
1175 | { | |
1176 | unsigned i; | |
1177 | int n, max_regno; | |
1178 | int *map; | |
1179 | lra_live_range_t r, prev_r, next_r; | |
55a2c322 VM |
1180 | sbitmap_iterator sbi; |
1181 | bool born_p, dead_p, prev_born_p, prev_dead_p; | |
1182 | ||
7ba9e72d TS |
1183 | auto_sbitmap born (lra_live_max_point); |
1184 | auto_sbitmap dead (lra_live_max_point); | |
f61e445a LC |
1185 | bitmap_clear (born); |
1186 | bitmap_clear (dead); | |
55a2c322 VM |
1187 | max_regno = max_reg_num (); |
1188 | for (i = FIRST_PSEUDO_REGISTER; i < (unsigned) max_regno; i++) | |
1189 | { | |
1190 | for (r = lra_reg_info[i].live_ranges; r != NULL; r = r->next) | |
1191 | { | |
1192 | lra_assert (r->start <= r->finish); | |
d7c028c0 LC |
1193 | bitmap_set_bit (born, r->start); |
1194 | bitmap_set_bit (dead, r->finish); | |
55a2c322 VM |
1195 | } |
1196 | } | |
7ba9e72d | 1197 | auto_sbitmap born_or_dead (lra_live_max_point); |
f61e445a | 1198 | bitmap_ior (born_or_dead, born, dead); |
55a2c322 VM |
1199 | map = XCNEWVEC (int, lra_live_max_point); |
1200 | n = -1; | |
1201 | prev_born_p = prev_dead_p = false; | |
d4ac4ce2 | 1202 | EXECUTE_IF_SET_IN_BITMAP (born_or_dead, 0, i, sbi) |
55a2c322 | 1203 | { |
d7c028c0 LC |
1204 | born_p = bitmap_bit_p (born, i); |
1205 | dead_p = bitmap_bit_p (dead, i); | |
55a2c322 VM |
1206 | if ((prev_born_p && ! prev_dead_p && born_p && ! dead_p) |
1207 | || (prev_dead_p && ! prev_born_p && dead_p && ! born_p)) | |
1208 | { | |
1209 | map[i] = n; | |
1210 | lra_point_freq[n] = MAX (lra_point_freq[n], lra_point_freq[i]); | |
1211 | } | |
1212 | else | |
1213 | { | |
1214 | map[i] = ++n; | |
1215 | lra_point_freq[n] = lra_point_freq[i]; | |
1216 | } | |
1217 | prev_born_p = born_p; | |
1218 | prev_dead_p = dead_p; | |
1219 | } | |
55a2c322 VM |
1220 | n++; |
1221 | if (lra_dump_file != NULL) | |
1222 | fprintf (lra_dump_file, "Compressing live ranges: from %d to %d - %d%%\n", | |
4720f4af IL |
1223 | lra_live_max_point, n, |
1224 | lra_live_max_point ? 100 * n / lra_live_max_point : 100); | |
55a2c322 VM |
1225 | if (n < lra_live_max_point) |
1226 | { | |
1227 | lra_live_max_point = n; | |
1228 | for (i = FIRST_PSEUDO_REGISTER; i < (unsigned) max_regno; i++) | |
1229 | { | |
1230 | for (prev_r = NULL, r = lra_reg_info[i].live_ranges; | |
1231 | r != NULL; | |
1232 | r = next_r) | |
1233 | { | |
1234 | next_r = r->next; | |
1235 | r->start = map[r->start]; | |
1236 | r->finish = map[r->finish]; | |
1237 | if (prev_r == NULL || prev_r->start > r->finish + 1) | |
1238 | { | |
1239 | prev_r = r; | |
1240 | continue; | |
1241 | } | |
1242 | prev_r->start = r->start; | |
1243 | prev_r->next = next_r; | |
af121e82 | 1244 | lra_live_range_pool.remove (r); |
55a2c322 VM |
1245 | } |
1246 | } | |
1247 | } | |
1248 | free (map); | |
1249 | } | |
1250 | ||
1251 | /* Print live ranges R to file F. */ | |
1252 | void | |
1253 | lra_print_live_range_list (FILE *f, lra_live_range_t r) | |
1254 | { | |
1255 | for (; r != NULL; r = r->next) | |
1256 | fprintf (f, " [%d..%d]", r->start, r->finish); | |
1257 | fprintf (f, "\n"); | |
1258 | } | |
1259 | ||
7b3b6ae4 LC |
1260 | DEBUG_FUNCTION void |
1261 | debug (lra_live_range &ref) | |
1262 | { | |
1263 | lra_print_live_range_list (stderr, &ref); | |
1264 | } | |
1265 | ||
1266 | DEBUG_FUNCTION void | |
1267 | debug (lra_live_range *ptr) | |
1268 | { | |
1269 | if (ptr) | |
1270 | debug (*ptr); | |
1271 | else | |
1272 | fprintf (stderr, "<nil>\n"); | |
1273 | } | |
1274 | ||
55a2c322 VM |
1275 | /* Print live ranges R to stderr. */ |
1276 | void | |
1277 | lra_debug_live_range_list (lra_live_range_t r) | |
1278 | { | |
1279 | lra_print_live_range_list (stderr, r); | |
1280 | } | |
1281 | ||
1282 | /* Print live ranges of pseudo REGNO to file F. */ | |
1283 | static void | |
1284 | print_pseudo_live_ranges (FILE *f, int regno) | |
1285 | { | |
1286 | if (lra_reg_info[regno].live_ranges == NULL) | |
1287 | return; | |
1288 | fprintf (f, " r%d:", regno); | |
1289 | lra_print_live_range_list (f, lra_reg_info[regno].live_ranges); | |
1290 | } | |
1291 | ||
1292 | /* Print live ranges of pseudo REGNO to stderr. */ | |
1293 | void | |
1294 | lra_debug_pseudo_live_ranges (int regno) | |
1295 | { | |
1296 | print_pseudo_live_ranges (stderr, regno); | |
1297 | } | |
1298 | ||
1299 | /* Print live ranges of all pseudos to file F. */ | |
1300 | static void | |
1301 | print_live_ranges (FILE *f) | |
1302 | { | |
1303 | int i, max_regno; | |
1304 | ||
1305 | max_regno = max_reg_num (); | |
1306 | for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++) | |
1307 | print_pseudo_live_ranges (f, i); | |
1308 | } | |
1309 | ||
1310 | /* Print live ranges of all pseudos to stderr. */ | |
1311 | void | |
1312 | lra_debug_live_ranges (void) | |
1313 | { | |
1314 | print_live_ranges (stderr); | |
1315 | } | |
1316 | ||
1317 | /* Compress pseudo live ranges. */ | |
1318 | static void | |
1319 | compress_live_ranges (void) | |
1320 | { | |
1321 | remove_some_program_points_and_update_live_ranges (); | |
1322 | if (lra_dump_file != NULL) | |
1323 | { | |
1324 | fprintf (lra_dump_file, "Ranges after the compression:\n"); | |
1325 | print_live_ranges (lra_dump_file); | |
1326 | } | |
1327 | } | |
1328 | ||
8160cd3e VM |
1329 | \f |
1330 | ||
55a2c322 VM |
1331 | /* The number of the current live range pass. */ |
1332 | int lra_live_range_iter; | |
1333 | ||
18ea3d61 VM |
1334 | /* The function creates live ranges only for memory pseudos (or for |
1335 | all ones if ALL_P), set up CONFLICT_HARD_REGS for the pseudos. It | |
1336 | also does dead insn elimination if DEAD_INSN_P and global live | |
1337 | analysis only for pseudos and only if the pseudo live info was | |
1338 | changed on a BB border. Return TRUE if the live info was | |
1339 | changed. */ | |
1340 | static bool | |
1341 | lra_create_live_ranges_1 (bool all_p, bool dead_insn_p) | |
55a2c322 VM |
1342 | { |
1343 | basic_block bb; | |
1344 | int i, hard_regno, max_regno = max_reg_num (); | |
1345 | int curr_point; | |
8160cd3e | 1346 | bool bb_live_change_p, have_referenced_pseudos = false; |
55a2c322 VM |
1347 | |
1348 | timevar_push (TV_LRA_CREATE_LIVE_RANGES); | |
1349 | ||
1350 | complete_info_p = all_p; | |
1351 | if (lra_dump_file != NULL) | |
1352 | fprintf (lra_dump_file, | |
1353 | "\n********** Pseudo live ranges #%d: **********\n\n", | |
1354 | ++lra_live_range_iter); | |
1355 | memset (lra_hard_reg_usage, 0, sizeof (lra_hard_reg_usage)); | |
1356 | for (i = 0; i < max_regno; i++) | |
1357 | { | |
1358 | lra_reg_info[i].live_ranges = NULL; | |
1359 | CLEAR_HARD_REG_SET (lra_reg_info[i].conflict_hard_regs); | |
1360 | lra_reg_info[i].preferred_hard_regno1 = -1; | |
1361 | lra_reg_info[i].preferred_hard_regno2 = -1; | |
1362 | lra_reg_info[i].preferred_hard_regno_profit1 = 0; | |
1363 | lra_reg_info[i].preferred_hard_regno_profit2 = 0; | |
1364 | #ifdef STACK_REGS | |
1365 | lra_reg_info[i].no_stack_p = false; | |
1366 | #endif | |
b28ece32 VM |
1367 | /* The biggest mode is already set but its value might be to |
1368 | conservative because of recent transformation. Here in this | |
1369 | file we recalculate it again as it costs practically | |
1370 | nothing. */ | |
874e50cb | 1371 | if (!HARD_REGISTER_NUM_P (i) && regno_reg_rtx[i] != NULL_RTX) |
55a2c322 VM |
1372 | lra_reg_info[i].biggest_mode = GET_MODE (regno_reg_rtx[i]); |
1373 | else | |
1374 | lra_reg_info[i].biggest_mode = VOIDmode; | |
874e50cb | 1375 | if (!HARD_REGISTER_NUM_P (i) |
85f9ce67 SB |
1376 | && lra_reg_info[i].nrefs != 0) |
1377 | { | |
1378 | if ((hard_regno = reg_renumber[i]) >= 0) | |
1379 | lra_hard_reg_usage[hard_regno] += lra_reg_info[i].freq; | |
1380 | have_referenced_pseudos = true; | |
1381 | } | |
55a2c322 VM |
1382 | } |
1383 | lra_free_copies (); | |
cb8abb1c | 1384 | |
85f9ce67 SB |
1385 | /* Under some circumstances, we can have functions without pseudo |
1386 | registers. For such functions, lra_live_max_point will be 0, | |
1387 | see e.g. PR55604, and there's nothing more to do for us here. */ | |
1388 | if (! have_referenced_pseudos) | |
1389 | { | |
1390 | timevar_pop (TV_LRA_CREATE_LIVE_RANGES); | |
18ea3d61 | 1391 | return false; |
85f9ce67 SB |
1392 | } |
1393 | ||
55a2c322 VM |
1394 | pseudos_live = sparseset_alloc (max_regno); |
1395 | pseudos_live_through_calls = sparseset_alloc (max_regno); | |
1396 | pseudos_live_through_setjumps = sparseset_alloc (max_regno); | |
1397 | start_living = sparseset_alloc (max_regno); | |
1398 | start_dying = sparseset_alloc (max_regno); | |
1399 | dead_set = sparseset_alloc (max_regno); | |
1400 | unused_set = sparseset_alloc (max_regno); | |
1401 | curr_point = 0; | |
af121e82 | 1402 | unsigned new_length = get_max_uid () * 2; |
7ad291c0 ML |
1403 | point_freq_vec.truncate (0); |
1404 | point_freq_vec.reserve_exact (new_length); | |
9771b263 | 1405 | lra_point_freq = point_freq_vec.address (); |
773cc925 RB |
1406 | int *rpo = XNEWVEC (int, n_basic_blocks_for_fn (cfun)); |
1407 | int n = inverted_rev_post_order_compute (cfun, rpo); | |
1408 | lra_assert (n == n_basic_blocks_for_fn (cfun)); | |
8160cd3e | 1409 | bb_live_change_p = false; |
773cc925 | 1410 | for (i = 0; i < n; ++i) |
55a2c322 | 1411 | { |
773cc925 | 1412 | bb = BASIC_BLOCK_FOR_FN (cfun, rpo[i]); |
fefa31b5 DM |
1413 | if (bb == EXIT_BLOCK_PTR_FOR_FN (cfun) || bb |
1414 | == ENTRY_BLOCK_PTR_FOR_FN (cfun)) | |
55a2c322 | 1415 | continue; |
18ea3d61 | 1416 | if (process_bb_lives (bb, curr_point, dead_insn_p)) |
8160cd3e VM |
1417 | bb_live_change_p = true; |
1418 | } | |
773cc925 | 1419 | free (rpo); |
8160cd3e VM |
1420 | if (bb_live_change_p) |
1421 | { | |
1422 | /* We need to clear pseudo live info as some pseudos can | |
1423 | disappear, e.g. pseudos with used equivalences. */ | |
1424 | FOR_EACH_BB_FN (bb, cfun) | |
1425 | { | |
1426 | bitmap_clear_range (df_get_live_in (bb), FIRST_PSEUDO_REGISTER, | |
1427 | max_regno - FIRST_PSEUDO_REGISTER); | |
1428 | bitmap_clear_range (df_get_live_out (bb), FIRST_PSEUDO_REGISTER, | |
1429 | max_regno - FIRST_PSEUDO_REGISTER); | |
1430 | } | |
1431 | /* As we did not change CFG since LRA start we can use | |
1432 | DF-infrastructure solver to solve live data flow problem. */ | |
874e50cb | 1433 | for (int i = 0; HARD_REGISTER_NUM_P (i); ++i) |
54178a01 TV |
1434 | { |
1435 | if (TEST_HARD_REG_BIT (hard_regs_spilled_into, i)) | |
1436 | bitmap_clear_bit (&all_hard_regs_bitmap, i); | |
1437 | } | |
8160cd3e VM |
1438 | df_simple_dataflow |
1439 | (DF_BACKWARD, NULL, live_con_fun_0, live_con_fun_n, | |
1440 | live_trans_fun, &all_blocks, | |
1441 | df_get_postorder (DF_BACKWARD), df_get_n_blocks (DF_BACKWARD)); | |
1442 | if (lra_dump_file != NULL) | |
1443 | { | |
6750565c VM |
1444 | fprintf (lra_dump_file, |
1445 | "Global pseudo live data have been updated:\n"); | |
8160cd3e VM |
1446 | basic_block bb; |
1447 | FOR_EACH_BB_FN (bb, cfun) | |
1448 | { | |
1449 | bb_data_t bb_info = get_bb_data (bb); | |
1450 | bitmap bb_livein = df_get_live_in (bb); | |
1451 | bitmap bb_liveout = df_get_live_out (bb); | |
1452 | ||
1453 | fprintf (lra_dump_file, "\nBB %d:\n", bb->index); | |
1454 | lra_dump_bitmap_with_title (" gen:", | |
1455 | &bb_info->gen_pseudos, bb->index); | |
1456 | lra_dump_bitmap_with_title (" killed:", | |
1457 | &bb_info->killed_pseudos, bb->index); | |
1458 | lra_dump_bitmap_with_title (" livein:", bb_livein, bb->index); | |
1459 | lra_dump_bitmap_with_title (" liveout:", bb_liveout, bb->index); | |
1460 | } | |
1461 | } | |
55a2c322 | 1462 | } |
55a2c322 VM |
1463 | lra_live_max_point = curr_point; |
1464 | if (lra_dump_file != NULL) | |
1465 | print_live_ranges (lra_dump_file); | |
1466 | /* Clean up. */ | |
1467 | sparseset_free (unused_set); | |
1468 | sparseset_free (dead_set); | |
1469 | sparseset_free (start_dying); | |
1470 | sparseset_free (start_living); | |
1471 | sparseset_free (pseudos_live_through_calls); | |
1472 | sparseset_free (pseudos_live_through_setjumps); | |
1473 | sparseset_free (pseudos_live); | |
1474 | compress_live_ranges (); | |
1475 | timevar_pop (TV_LRA_CREATE_LIVE_RANGES); | |
18ea3d61 VM |
1476 | return bb_live_change_p; |
1477 | } | |
1478 | ||
1479 | /* The main entry function creates live-ranges and other live info | |
1480 | necessary for the assignment sub-pass. It uses | |
1481 | lra_creates_live_ranges_1 -- so read comments for the | |
1482 | function. */ | |
1483 | void | |
1484 | lra_create_live_ranges (bool all_p, bool dead_insn_p) | |
1485 | { | |
1486 | if (! lra_create_live_ranges_1 (all_p, dead_insn_p)) | |
1487 | return; | |
1488 | if (lra_dump_file != NULL) | |
1489 | fprintf (lra_dump_file, "Live info was changed -- recalculate it\n"); | |
1490 | /* Live info was changed on a bb border. It means that some info, | |
9503ade2 VM |
1491 | e.g. about conflict regs, calls crossed, and live ranges may be |
1492 | wrong. We need this info for allocation. So recalculate it | |
1493 | again but without removing dead insns which can change live info | |
1494 | again. Repetitive live range calculations are expensive therefore | |
1495 | we stop here as we already have correct info although some | |
1496 | improvement in rare cases could be possible on this sub-pass if | |
1497 | we do dead insn elimination again (still the improvement may | |
1498 | happen later). */ | |
18ea3d61 | 1499 | lra_clear_live_ranges (); |
9503ade2 | 1500 | bool res = lra_create_live_ranges_1 (all_p, false); |
18ea3d61 | 1501 | lra_assert (! res); |
55a2c322 VM |
1502 | } |
1503 | ||
1504 | /* Finish all live ranges. */ | |
1505 | void | |
1506 | lra_clear_live_ranges (void) | |
1507 | { | |
1508 | int i; | |
1509 | ||
1510 | for (i = 0; i < max_reg_num (); i++) | |
1511 | free_live_range_list (lra_reg_info[i].live_ranges); | |
9771b263 | 1512 | point_freq_vec.release (); |
55a2c322 VM |
1513 | } |
1514 | ||
1515 | /* Initialize live ranges data once per function. */ | |
1516 | void | |
1517 | lra_live_ranges_init (void) | |
1518 | { | |
4ab74a01 | 1519 | bitmap_initialize (&temp_bitmap, ®_obstack); |
8160cd3e | 1520 | initiate_live_solver (); |
55a2c322 VM |
1521 | } |
1522 | ||
1523 | /* Finish live ranges data once per function. */ | |
1524 | void | |
1525 | lra_live_ranges_finish (void) | |
1526 | { | |
8160cd3e | 1527 | finish_live_solver (); |
4ab74a01 | 1528 | bitmap_clear (&temp_bitmap); |
fb0b2914 | 1529 | lra_live_range_pool.release (); |
55a2c322 | 1530 | } |