Mercurial > hg > CbC > CbC_gcc
annotate gcc/loop-unroll.c @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:39:51 +0900 |
| parents | a06113de4d67 |
| children | b7f97abdc517 |
| rev | line source |
|---|---|
| 0 | 1 /* Loop unrolling and peeling. |
| 2 Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008 | |
| 3 Free Software Foundation, Inc. | |
| 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 #include "config.h" | |
| 22 #include "system.h" | |
| 23 #include "coretypes.h" | |
| 24 #include "tm.h" | |
| 25 #include "rtl.h" | |
| 26 #include "hard-reg-set.h" | |
| 27 #include "obstack.h" | |
| 28 #include "basic-block.h" | |
| 29 #include "cfgloop.h" | |
| 30 #include "cfglayout.h" | |
| 31 #include "params.h" | |
| 32 #include "output.h" | |
| 33 #include "expr.h" | |
| 34 #include "hashtab.h" | |
|
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35 #include "recog.h" |
| 0 | 36 |
| 37 /* This pass performs loop unrolling and peeling. We only perform these | |
| 38 optimizations on innermost loops (with single exception) because | |
| 39 the impact on performance is greatest here, and we want to avoid | |
| 40 unnecessary code size growth. The gain is caused by greater sequentiality | |
| 41 of code, better code to optimize for further passes and in some cases | |
| 42 by fewer testings of exit conditions. The main problem is code growth, | |
| 43 that impacts performance negatively due to effect of caches. | |
| 44 | |
| 45 What we do: | |
| 46 | |
| 47 -- complete peeling of once-rolling loops; this is the above mentioned | |
| 48 exception, as this causes loop to be cancelled completely and | |
| 49 does not cause code growth | |
| 50 -- complete peeling of loops that roll (small) constant times. | |
| 51 -- simple peeling of first iterations of loops that do not roll much | |
| 52 (according to profile feedback) | |
| 53 -- unrolling of loops that roll constant times; this is almost always | |
| 54 win, as we get rid of exit condition tests. | |
| 55 -- unrolling of loops that roll number of times that we can compute | |
| 56 in runtime; we also get rid of exit condition tests here, but there | |
| 57 is the extra expense for calculating the number of iterations | |
| 58 -- simple unrolling of remaining loops; this is performed only if we | |
| 59 are asked to, as the gain is questionable in this case and often | |
| 60 it may even slow down the code | |
| 61 For more detailed descriptions of each of those, see comments at | |
| 62 appropriate function below. | |
| 63 | |
| 64 There is a lot of parameters (defined and described in params.def) that | |
| 65 control how much we unroll/peel. | |
| 66 | |
| 67 ??? A great problem is that we don't have a good way how to determine | |
| 68 how many times we should unroll the loop; the experiments I have made | |
| 69 showed that this choice may affect performance in order of several %. | |
| 70 */ | |
| 71 | |
| 72 /* Information about induction variables to split. */ | |
| 73 | |
| 74 struct iv_to_split | |
| 75 { | |
| 76 rtx insn; /* The insn in that the induction variable occurs. */ | |
| 77 rtx base_var; /* The variable on that the values in the further | |
| 78 iterations are based. */ | |
| 79 rtx step; /* Step of the induction variable. */ | |
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80 struct iv_to_split *next; /* Next entry in walking order. */ |
| 0 | 81 unsigned n_loc; |
| 82 unsigned loc[3]; /* Location where the definition of the induction | |
| 83 variable occurs in the insn. For example if | |
| 84 N_LOC is 2, the expression is located at | |
|
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85 XEXP (XEXP (single_set, loc[0]), loc[1]). */ |
| 0 | 86 }; |
| 87 | |
| 88 /* Information about accumulators to expand. */ | |
| 89 | |
| 90 struct var_to_expand | |
| 91 { | |
| 92 rtx insn; /* The insn in that the variable expansion occurs. */ | |
| 93 rtx reg; /* The accumulator which is expanded. */ | |
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94 VEC(rtx,heap) *var_expansions; /* The copies of the accumulator which is expanded. */ |
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95 struct var_to_expand *next; /* Next entry in walking order. */ |
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96 enum rtx_code op; /* The type of the accumulation - addition, subtraction |
| 0 | 97 or multiplication. */ |
| 98 int expansion_count; /* Count the number of expansions generated so far. */ | |
| 99 int reuse_expansion; /* The expansion we intend to reuse to expand | |
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100 the accumulator. If REUSE_EXPANSION is 0 reuse |
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101 the original accumulator. Else use |
| 0 | 102 var_expansions[REUSE_EXPANSION - 1]. */ |
| 103 unsigned accum_pos; /* The position in which the accumulator is placed in | |
| 104 the insn src. For example in x = x + something | |
| 105 accum_pos is 0 while in x = something + x accum_pos | |
| 106 is 1. */ | |
| 107 }; | |
| 108 | |
| 109 /* Information about optimization applied in | |
| 110 the unrolled loop. */ | |
| 111 | |
| 112 struct opt_info | |
| 113 { | |
| 114 htab_t insns_to_split; /* A hashtable of insns to split. */ | |
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115 struct iv_to_split *iv_to_split_head; /* The first iv to split. */ |
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116 struct iv_to_split **iv_to_split_tail; /* Pointer to the tail of the list. */ |
| 0 | 117 htab_t insns_with_var_to_expand; /* A hashtable of insns with accumulators |
| 118 to expand. */ | |
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119 struct var_to_expand *var_to_expand_head; /* The first var to expand. */ |
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120 struct var_to_expand **var_to_expand_tail; /* Pointer to the tail of the list. */ |
| 0 | 121 unsigned first_new_block; /* The first basic block that was |
| 122 duplicated. */ | |
| 123 basic_block loop_exit; /* The loop exit basic block. */ | |
| 124 basic_block loop_preheader; /* The loop preheader basic block. */ | |
| 125 }; | |
| 126 | |
| 127 static void decide_unrolling_and_peeling (int); | |
| 128 static void peel_loops_completely (int); | |
| 129 static void decide_peel_simple (struct loop *, int); | |
| 130 static void decide_peel_once_rolling (struct loop *, int); | |
| 131 static void decide_peel_completely (struct loop *, int); | |
| 132 static void decide_unroll_stupid (struct loop *, int); | |
| 133 static void decide_unroll_constant_iterations (struct loop *, int); | |
| 134 static void decide_unroll_runtime_iterations (struct loop *, int); | |
| 135 static void peel_loop_simple (struct loop *); | |
| 136 static void peel_loop_completely (struct loop *); | |
| 137 static void unroll_loop_stupid (struct loop *); | |
| 138 static void unroll_loop_constant_iterations (struct loop *); | |
| 139 static void unroll_loop_runtime_iterations (struct loop *); | |
| 140 static struct opt_info *analyze_insns_in_loop (struct loop *); | |
| 141 static void opt_info_start_duplication (struct opt_info *); | |
| 142 static void apply_opt_in_copies (struct opt_info *, unsigned, bool, bool); | |
| 143 static void free_opt_info (struct opt_info *); | |
| 144 static struct var_to_expand *analyze_insn_to_expand_var (struct loop*, rtx); | |
| 145 static bool referenced_in_one_insn_in_loop_p (struct loop *, rtx); | |
| 146 static struct iv_to_split *analyze_iv_to_split_insn (rtx); | |
| 147 static void expand_var_during_unrolling (struct var_to_expand *, rtx); | |
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148 static void insert_var_expansion_initialization (struct var_to_expand *, |
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149 basic_block); |
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150 static void combine_var_copies_in_loop_exit (struct var_to_expand *, |
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151 basic_block); |
| 0 | 152 static rtx get_expansion (struct var_to_expand *); |
| 153 | |
| 154 /* Unroll and/or peel (depending on FLAGS) LOOPS. */ | |
| 155 void | |
| 156 unroll_and_peel_loops (int flags) | |
| 157 { | |
| 158 struct loop *loop; | |
| 159 bool check; | |
| 160 loop_iterator li; | |
| 161 | |
| 162 /* First perform complete loop peeling (it is almost surely a win, | |
| 163 and affects parameters for further decision a lot). */ | |
| 164 peel_loops_completely (flags); | |
| 165 | |
| 166 /* Now decide rest of unrolling and peeling. */ | |
| 167 decide_unrolling_and_peeling (flags); | |
| 168 | |
| 169 /* Scan the loops, inner ones first. */ | |
| 170 FOR_EACH_LOOP (li, loop, LI_FROM_INNERMOST) | |
| 171 { | |
| 172 check = true; | |
| 173 /* And perform the appropriate transformations. */ | |
| 174 switch (loop->lpt_decision.decision) | |
| 175 { | |
| 176 case LPT_PEEL_COMPLETELY: | |
| 177 /* Already done. */ | |
| 178 gcc_unreachable (); | |
| 179 case LPT_PEEL_SIMPLE: | |
| 180 peel_loop_simple (loop); | |
| 181 break; | |
| 182 case LPT_UNROLL_CONSTANT: | |
| 183 unroll_loop_constant_iterations (loop); | |
| 184 break; | |
| 185 case LPT_UNROLL_RUNTIME: | |
| 186 unroll_loop_runtime_iterations (loop); | |
| 187 break; | |
| 188 case LPT_UNROLL_STUPID: | |
| 189 unroll_loop_stupid (loop); | |
| 190 break; | |
| 191 case LPT_NONE: | |
| 192 check = false; | |
| 193 break; | |
| 194 default: | |
| 195 gcc_unreachable (); | |
| 196 } | |
| 197 if (check) | |
| 198 { | |
| 199 #ifdef ENABLE_CHECKING | |
| 200 verify_dominators (CDI_DOMINATORS); | |
| 201 verify_loop_structure (); | |
| 202 #endif | |
| 203 } | |
| 204 } | |
| 205 | |
| 206 iv_analysis_done (); | |
| 207 } | |
| 208 | |
| 209 /* Check whether exit of the LOOP is at the end of loop body. */ | |
| 210 | |
| 211 static bool | |
| 212 loop_exit_at_end_p (struct loop *loop) | |
| 213 { | |
| 214 struct niter_desc *desc = get_simple_loop_desc (loop); | |
| 215 rtx insn; | |
| 216 | |
| 217 if (desc->in_edge->dest != loop->latch) | |
| 218 return false; | |
| 219 | |
| 220 /* Check that the latch is empty. */ | |
| 221 FOR_BB_INSNS (loop->latch, insn) | |
| 222 { | |
| 223 if (INSN_P (insn)) | |
| 224 return false; | |
| 225 } | |
| 226 | |
| 227 return true; | |
| 228 } | |
| 229 | |
| 230 /* Depending on FLAGS, check whether to peel loops completely and do so. */ | |
| 231 static void | |
| 232 peel_loops_completely (int flags) | |
| 233 { | |
| 234 struct loop *loop; | |
| 235 loop_iterator li; | |
| 236 | |
| 237 /* Scan the loops, the inner ones first. */ | |
| 238 FOR_EACH_LOOP (li, loop, LI_FROM_INNERMOST) | |
| 239 { | |
| 240 loop->lpt_decision.decision = LPT_NONE; | |
| 241 | |
| 242 if (dump_file) | |
| 243 fprintf (dump_file, | |
| 244 "\n;; *** Considering loop %d for complete peeling ***\n", | |
| 245 loop->num); | |
| 246 | |
| 247 loop->ninsns = num_loop_insns (loop); | |
| 248 | |
| 249 decide_peel_once_rolling (loop, flags); | |
| 250 if (loop->lpt_decision.decision == LPT_NONE) | |
| 251 decide_peel_completely (loop, flags); | |
| 252 | |
| 253 if (loop->lpt_decision.decision == LPT_PEEL_COMPLETELY) | |
| 254 { | |
| 255 peel_loop_completely (loop); | |
| 256 #ifdef ENABLE_CHECKING | |
| 257 verify_dominators (CDI_DOMINATORS); | |
| 258 verify_loop_structure (); | |
| 259 #endif | |
| 260 } | |
| 261 } | |
| 262 } | |
| 263 | |
| 264 /* Decide whether unroll or peel loops (depending on FLAGS) and how much. */ | |
| 265 static void | |
| 266 decide_unrolling_and_peeling (int flags) | |
| 267 { | |
| 268 struct loop *loop; | |
| 269 loop_iterator li; | |
| 270 | |
| 271 /* Scan the loops, inner ones first. */ | |
| 272 FOR_EACH_LOOP (li, loop, LI_FROM_INNERMOST) | |
| 273 { | |
| 274 loop->lpt_decision.decision = LPT_NONE; | |
| 275 | |
| 276 if (dump_file) | |
| 277 fprintf (dump_file, "\n;; *** Considering loop %d ***\n", loop->num); | |
| 278 | |
| 279 /* Do not peel cold areas. */ | |
| 280 if (optimize_loop_for_size_p (loop)) | |
| 281 { | |
| 282 if (dump_file) | |
| 283 fprintf (dump_file, ";; Not considering loop, cold area\n"); | |
| 284 continue; | |
| 285 } | |
| 286 | |
| 287 /* Can the loop be manipulated? */ | |
| 288 if (!can_duplicate_loop_p (loop)) | |
| 289 { | |
| 290 if (dump_file) | |
| 291 fprintf (dump_file, | |
| 292 ";; Not considering loop, cannot duplicate\n"); | |
| 293 continue; | |
| 294 } | |
| 295 | |
| 296 /* Skip non-innermost loops. */ | |
| 297 if (loop->inner) | |
| 298 { | |
| 299 if (dump_file) | |
| 300 fprintf (dump_file, ";; Not considering loop, is not innermost\n"); | |
| 301 continue; | |
| 302 } | |
| 303 | |
| 304 loop->ninsns = num_loop_insns (loop); | |
| 305 loop->av_ninsns = average_num_loop_insns (loop); | |
| 306 | |
| 307 /* Try transformations one by one in decreasing order of | |
| 308 priority. */ | |
| 309 | |
| 310 decide_unroll_constant_iterations (loop, flags); | |
| 311 if (loop->lpt_decision.decision == LPT_NONE) | |
| 312 decide_unroll_runtime_iterations (loop, flags); | |
| 313 if (loop->lpt_decision.decision == LPT_NONE) | |
| 314 decide_unroll_stupid (loop, flags); | |
| 315 if (loop->lpt_decision.decision == LPT_NONE) | |
| 316 decide_peel_simple (loop, flags); | |
| 317 } | |
| 318 } | |
| 319 | |
| 320 /* Decide whether the LOOP is once rolling and suitable for complete | |
| 321 peeling. */ | |
| 322 static void | |
| 323 decide_peel_once_rolling (struct loop *loop, int flags ATTRIBUTE_UNUSED) | |
| 324 { | |
| 325 struct niter_desc *desc; | |
| 326 | |
| 327 if (dump_file) | |
| 328 fprintf (dump_file, "\n;; Considering peeling once rolling loop\n"); | |
| 329 | |
| 330 /* Is the loop small enough? */ | |
| 331 if ((unsigned) PARAM_VALUE (PARAM_MAX_ONCE_PEELED_INSNS) < loop->ninsns) | |
| 332 { | |
| 333 if (dump_file) | |
| 334 fprintf (dump_file, ";; Not considering loop, is too big\n"); | |
| 335 return; | |
| 336 } | |
| 337 | |
| 338 /* Check for simple loops. */ | |
| 339 desc = get_simple_loop_desc (loop); | |
| 340 | |
| 341 /* Check number of iterations. */ | |
| 342 if (!desc->simple_p | |
| 343 || desc->assumptions | |
| 344 || desc->infinite | |
| 345 || !desc->const_iter | |
| 346 || desc->niter != 0) | |
| 347 { | |
| 348 if (dump_file) | |
| 349 fprintf (dump_file, | |
| 350 ";; Unable to prove that the loop rolls exactly once\n"); | |
| 351 return; | |
| 352 } | |
| 353 | |
| 354 /* Success. */ | |
| 355 if (dump_file) | |
| 356 fprintf (dump_file, ";; Decided to peel exactly once rolling loop\n"); | |
| 357 loop->lpt_decision.decision = LPT_PEEL_COMPLETELY; | |
| 358 } | |
| 359 | |
| 360 /* Decide whether the LOOP is suitable for complete peeling. */ | |
| 361 static void | |
| 362 decide_peel_completely (struct loop *loop, int flags ATTRIBUTE_UNUSED) | |
| 363 { | |
| 364 unsigned npeel; | |
| 365 struct niter_desc *desc; | |
| 366 | |
| 367 if (dump_file) | |
| 368 fprintf (dump_file, "\n;; Considering peeling completely\n"); | |
| 369 | |
| 370 /* Skip non-innermost loops. */ | |
| 371 if (loop->inner) | |
| 372 { | |
| 373 if (dump_file) | |
| 374 fprintf (dump_file, ";; Not considering loop, is not innermost\n"); | |
| 375 return; | |
| 376 } | |
| 377 | |
| 378 /* Do not peel cold areas. */ | |
| 379 if (optimize_loop_for_size_p (loop)) | |
| 380 { | |
| 381 if (dump_file) | |
| 382 fprintf (dump_file, ";; Not considering loop, cold area\n"); | |
| 383 return; | |
| 384 } | |
| 385 | |
| 386 /* Can the loop be manipulated? */ | |
| 387 if (!can_duplicate_loop_p (loop)) | |
| 388 { | |
| 389 if (dump_file) | |
| 390 fprintf (dump_file, | |
| 391 ";; Not considering loop, cannot duplicate\n"); | |
| 392 return; | |
| 393 } | |
| 394 | |
| 395 /* npeel = number of iterations to peel. */ | |
| 396 npeel = PARAM_VALUE (PARAM_MAX_COMPLETELY_PEELED_INSNS) / loop->ninsns; | |
| 397 if (npeel > (unsigned) PARAM_VALUE (PARAM_MAX_COMPLETELY_PEEL_TIMES)) | |
| 398 npeel = PARAM_VALUE (PARAM_MAX_COMPLETELY_PEEL_TIMES); | |
| 399 | |
| 400 /* Is the loop small enough? */ | |
| 401 if (!npeel) | |
| 402 { | |
| 403 if (dump_file) | |
| 404 fprintf (dump_file, ";; Not considering loop, is too big\n"); | |
| 405 return; | |
| 406 } | |
| 407 | |
| 408 /* Check for simple loops. */ | |
| 409 desc = get_simple_loop_desc (loop); | |
| 410 | |
| 411 /* Check number of iterations. */ | |
| 412 if (!desc->simple_p | |
| 413 || desc->assumptions | |
| 414 || !desc->const_iter | |
| 415 || desc->infinite) | |
| 416 { | |
| 417 if (dump_file) | |
| 418 fprintf (dump_file, | |
| 419 ";; Unable to prove that the loop iterates constant times\n"); | |
| 420 return; | |
| 421 } | |
| 422 | |
| 423 if (desc->niter > npeel - 1) | |
| 424 { | |
| 425 if (dump_file) | |
| 426 { | |
| 427 fprintf (dump_file, | |
| 428 ";; Not peeling loop completely, rolls too much ("); | |
| 429 fprintf (dump_file, HOST_WIDEST_INT_PRINT_DEC, desc->niter); | |
| 430 fprintf (dump_file, " iterations > %d [maximum peelings])\n", npeel); | |
| 431 } | |
| 432 return; | |
| 433 } | |
| 434 | |
| 435 /* Success. */ | |
| 436 if (dump_file) | |
| 437 fprintf (dump_file, ";; Decided to peel loop completely\n"); | |
| 438 loop->lpt_decision.decision = LPT_PEEL_COMPLETELY; | |
| 439 } | |
| 440 | |
| 441 /* Peel all iterations of LOOP, remove exit edges and cancel the loop | |
| 442 completely. The transformation done: | |
| 443 | |
| 444 for (i = 0; i < 4; i++) | |
| 445 body; | |
| 446 | |
| 447 ==> | |
| 448 | |
| 449 i = 0; | |
| 450 body; i++; | |
| 451 body; i++; | |
| 452 body; i++; | |
| 453 body; i++; | |
| 454 */ | |
| 455 static void | |
| 456 peel_loop_completely (struct loop *loop) | |
| 457 { | |
| 458 sbitmap wont_exit; | |
| 459 unsigned HOST_WIDE_INT npeel; | |
| 460 unsigned i; | |
| 461 VEC (edge, heap) *remove_edges; | |
| 462 edge ein; | |
| 463 struct niter_desc *desc = get_simple_loop_desc (loop); | |
| 464 struct opt_info *opt_info = NULL; | |
|
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465 |
| 0 | 466 npeel = desc->niter; |
| 467 | |
| 468 if (npeel) | |
| 469 { | |
| 470 bool ok; | |
|
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471 |
| 0 | 472 wont_exit = sbitmap_alloc (npeel + 1); |
| 473 sbitmap_ones (wont_exit); | |
| 474 RESET_BIT (wont_exit, 0); | |
| 475 if (desc->noloop_assumptions) | |
| 476 RESET_BIT (wont_exit, 1); | |
| 477 | |
| 478 remove_edges = NULL; | |
| 479 | |
| 480 if (flag_split_ivs_in_unroller) | |
| 481 opt_info = analyze_insns_in_loop (loop); | |
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482 |
| 0 | 483 opt_info_start_duplication (opt_info); |
| 484 ok = duplicate_loop_to_header_edge (loop, loop_preheader_edge (loop), | |
| 485 npeel, | |
| 486 wont_exit, desc->out_edge, | |
| 487 &remove_edges, | |
| 488 DLTHE_FLAG_UPDATE_FREQ | |
| 489 | DLTHE_FLAG_COMPLETTE_PEEL | |
| 490 | (opt_info | |
| 491 ? DLTHE_RECORD_COPY_NUMBER : 0)); | |
| 492 gcc_assert (ok); | |
| 493 | |
| 494 free (wont_exit); | |
|
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495 |
| 0 | 496 if (opt_info) |
| 497 { | |
| 498 apply_opt_in_copies (opt_info, npeel, false, true); | |
| 499 free_opt_info (opt_info); | |
| 500 } | |
| 501 | |
| 502 /* Remove the exit edges. */ | |
| 503 for (i = 0; VEC_iterate (edge, remove_edges, i, ein); i++) | |
| 504 remove_path (ein); | |
| 505 VEC_free (edge, heap, remove_edges); | |
| 506 } | |
| 507 | |
| 508 ein = desc->in_edge; | |
| 509 free_simple_loop_desc (loop); | |
| 510 | |
| 511 /* Now remove the unreachable part of the last iteration and cancel | |
| 512 the loop. */ | |
| 513 remove_path (ein); | |
| 514 | |
| 515 if (dump_file) | |
| 516 fprintf (dump_file, ";; Peeled loop completely, %d times\n", (int) npeel); | |
| 517 } | |
| 518 | |
| 519 /* Decide whether to unroll LOOP iterating constant number of times | |
| 520 and how much. */ | |
| 521 | |
| 522 static void | |
| 523 decide_unroll_constant_iterations (struct loop *loop, int flags) | |
| 524 { | |
| 525 unsigned nunroll, nunroll_by_av, best_copies, best_unroll = 0, n_copies, i; | |
| 526 struct niter_desc *desc; | |
| 527 | |
| 528 if (!(flags & UAP_UNROLL)) | |
| 529 { | |
| 530 /* We were not asked to, just return back silently. */ | |
| 531 return; | |
| 532 } | |
| 533 | |
| 534 if (dump_file) | |
| 535 fprintf (dump_file, | |
| 536 "\n;; Considering unrolling loop with constant " | |
| 537 "number of iterations\n"); | |
| 538 | |
| 539 /* nunroll = total number of copies of the original loop body in | |
| 540 unrolled loop (i.e. if it is 2, we have to duplicate loop body once. */ | |
| 541 nunroll = PARAM_VALUE (PARAM_MAX_UNROLLED_INSNS) / loop->ninsns; | |
| 542 nunroll_by_av | |
| 543 = PARAM_VALUE (PARAM_MAX_AVERAGE_UNROLLED_INSNS) / loop->av_ninsns; | |
| 544 if (nunroll > nunroll_by_av) | |
| 545 nunroll = nunroll_by_av; | |
| 546 if (nunroll > (unsigned) PARAM_VALUE (PARAM_MAX_UNROLL_TIMES)) | |
| 547 nunroll = PARAM_VALUE (PARAM_MAX_UNROLL_TIMES); | |
| 548 | |
| 549 /* Skip big loops. */ | |
| 550 if (nunroll <= 1) | |
| 551 { | |
| 552 if (dump_file) | |
| 553 fprintf (dump_file, ";; Not considering loop, is too big\n"); | |
| 554 return; | |
| 555 } | |
| 556 | |
| 557 /* Check for simple loops. */ | |
| 558 desc = get_simple_loop_desc (loop); | |
| 559 | |
| 560 /* Check number of iterations. */ | |
| 561 if (!desc->simple_p || !desc->const_iter || desc->assumptions) | |
| 562 { | |
| 563 if (dump_file) | |
| 564 fprintf (dump_file, | |
| 565 ";; Unable to prove that the loop iterates constant times\n"); | |
| 566 return; | |
| 567 } | |
| 568 | |
| 569 /* Check whether the loop rolls enough to consider. */ | |
| 570 if (desc->niter < 2 * nunroll) | |
| 571 { | |
| 572 if (dump_file) | |
| 573 fprintf (dump_file, ";; Not unrolling loop, doesn't roll\n"); | |
| 574 return; | |
| 575 } | |
| 576 | |
| 577 /* Success; now compute number of iterations to unroll. We alter | |
| 578 nunroll so that as few as possible copies of loop body are | |
| 579 necessary, while still not decreasing the number of unrollings | |
| 580 too much (at most by 1). */ | |
| 581 best_copies = 2 * nunroll + 10; | |
| 582 | |
| 583 i = 2 * nunroll + 2; | |
| 584 if (i - 1 >= desc->niter) | |
| 585 i = desc->niter - 2; | |
| 586 | |
| 587 for (; i >= nunroll - 1; i--) | |
| 588 { | |
| 589 unsigned exit_mod = desc->niter % (i + 1); | |
| 590 | |
| 591 if (!loop_exit_at_end_p (loop)) | |
| 592 n_copies = exit_mod + i + 1; | |
| 593 else if (exit_mod != (unsigned) i | |
| 594 || desc->noloop_assumptions != NULL_RTX) | |
| 595 n_copies = exit_mod + i + 2; | |
| 596 else | |
| 597 n_copies = i + 1; | |
| 598 | |
| 599 if (n_copies < best_copies) | |
| 600 { | |
| 601 best_copies = n_copies; | |
| 602 best_unroll = i; | |
| 603 } | |
| 604 } | |
| 605 | |
| 606 if (dump_file) | |
| 607 fprintf (dump_file, ";; max_unroll %d (%d copies, initial %d).\n", | |
| 608 best_unroll + 1, best_copies, nunroll); | |
| 609 | |
| 610 loop->lpt_decision.decision = LPT_UNROLL_CONSTANT; | |
| 611 loop->lpt_decision.times = best_unroll; | |
|
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612 |
| 0 | 613 if (dump_file) |
| 614 fprintf (dump_file, | |
| 615 ";; Decided to unroll the constant times rolling loop, %d times.\n", | |
| 616 loop->lpt_decision.times); | |
| 617 } | |
| 618 | |
| 619 /* Unroll LOOP with constant number of iterations LOOP->LPT_DECISION.TIMES + 1 | |
| 620 times. The transformation does this: | |
| 621 | |
| 622 for (i = 0; i < 102; i++) | |
| 623 body; | |
| 624 | |
| 625 ==> | |
| 626 | |
| 627 i = 0; | |
| 628 body; i++; | |
| 629 body; i++; | |
| 630 while (i < 102) | |
| 631 { | |
| 632 body; i++; | |
| 633 body; i++; | |
| 634 body; i++; | |
| 635 body; i++; | |
| 636 } | |
| 637 */ | |
| 638 static void | |
| 639 unroll_loop_constant_iterations (struct loop *loop) | |
| 640 { | |
| 641 unsigned HOST_WIDE_INT niter; | |
| 642 unsigned exit_mod; | |
| 643 sbitmap wont_exit; | |
| 644 unsigned i; | |
| 645 VEC (edge, heap) *remove_edges; | |
| 646 edge e; | |
| 647 unsigned max_unroll = loop->lpt_decision.times; | |
| 648 struct niter_desc *desc = get_simple_loop_desc (loop); | |
| 649 bool exit_at_end = loop_exit_at_end_p (loop); | |
| 650 struct opt_info *opt_info = NULL; | |
| 651 bool ok; | |
|
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652 |
| 0 | 653 niter = desc->niter; |
| 654 | |
| 655 /* Should not get here (such loop should be peeled instead). */ | |
| 656 gcc_assert (niter > max_unroll + 1); | |
| 657 | |
| 658 exit_mod = niter % (max_unroll + 1); | |
| 659 | |
| 660 wont_exit = sbitmap_alloc (max_unroll + 1); | |
| 661 sbitmap_ones (wont_exit); | |
| 662 | |
| 663 remove_edges = NULL; | |
|
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664 if (flag_split_ivs_in_unroller |
| 0 | 665 || flag_variable_expansion_in_unroller) |
| 666 opt_info = analyze_insns_in_loop (loop); | |
|
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667 |
| 0 | 668 if (!exit_at_end) |
| 669 { | |
| 670 /* The exit is not at the end of the loop; leave exit test | |
| 671 in the first copy, so that the loops that start with test | |
| 672 of exit condition have continuous body after unrolling. */ | |
| 673 | |
| 674 if (dump_file) | |
| 675 fprintf (dump_file, ";; Condition on beginning of loop.\n"); | |
| 676 | |
| 677 /* Peel exit_mod iterations. */ | |
| 678 RESET_BIT (wont_exit, 0); | |
| 679 if (desc->noloop_assumptions) | |
| 680 RESET_BIT (wont_exit, 1); | |
| 681 | |
| 682 if (exit_mod) | |
| 683 { | |
| 684 opt_info_start_duplication (opt_info); | |
| 685 ok = duplicate_loop_to_header_edge (loop, loop_preheader_edge (loop), | |
| 686 exit_mod, | |
| 687 wont_exit, desc->out_edge, | |
| 688 &remove_edges, | |
| 689 DLTHE_FLAG_UPDATE_FREQ | |
| 690 | (opt_info && exit_mod > 1 | |
| 691 ? DLTHE_RECORD_COPY_NUMBER | |
| 692 : 0)); | |
| 693 gcc_assert (ok); | |
| 694 | |
| 695 if (opt_info && exit_mod > 1) | |
|
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696 apply_opt_in_copies (opt_info, exit_mod, false, false); |
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697 |
| 0 | 698 desc->noloop_assumptions = NULL_RTX; |
| 699 desc->niter -= exit_mod; | |
| 700 desc->niter_max -= exit_mod; | |
| 701 } | |
| 702 | |
| 703 SET_BIT (wont_exit, 1); | |
| 704 } | |
| 705 else | |
| 706 { | |
| 707 /* Leave exit test in last copy, for the same reason as above if | |
| 708 the loop tests the condition at the end of loop body. */ | |
| 709 | |
| 710 if (dump_file) | |
| 711 fprintf (dump_file, ";; Condition on end of loop.\n"); | |
| 712 | |
| 713 /* We know that niter >= max_unroll + 2; so we do not need to care of | |
| 714 case when we would exit before reaching the loop. So just peel | |
| 715 exit_mod + 1 iterations. */ | |
| 716 if (exit_mod != max_unroll | |
| 717 || desc->noloop_assumptions) | |
| 718 { | |
| 719 RESET_BIT (wont_exit, 0); | |
| 720 if (desc->noloop_assumptions) | |
| 721 RESET_BIT (wont_exit, 1); | |
|
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722 |
| 0 | 723 opt_info_start_duplication (opt_info); |
| 724 ok = duplicate_loop_to_header_edge (loop, loop_preheader_edge (loop), | |
| 725 exit_mod + 1, | |
| 726 wont_exit, desc->out_edge, | |
| 727 &remove_edges, | |
| 728 DLTHE_FLAG_UPDATE_FREQ | |
| 729 | (opt_info && exit_mod > 0 | |
| 730 ? DLTHE_RECORD_COPY_NUMBER | |
| 731 : 0)); | |
| 732 gcc_assert (ok); | |
|
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733 |
| 0 | 734 if (opt_info && exit_mod > 0) |
| 735 apply_opt_in_copies (opt_info, exit_mod + 1, false, false); | |
| 736 | |
| 737 desc->niter -= exit_mod + 1; | |
| 738 desc->niter_max -= exit_mod + 1; | |
| 739 desc->noloop_assumptions = NULL_RTX; | |
| 740 | |
| 741 SET_BIT (wont_exit, 0); | |
| 742 SET_BIT (wont_exit, 1); | |
| 743 } | |
| 744 | |
| 745 RESET_BIT (wont_exit, max_unroll); | |
| 746 } | |
| 747 | |
| 748 /* Now unroll the loop. */ | |
|
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749 |
| 0 | 750 opt_info_start_duplication (opt_info); |
| 751 ok = duplicate_loop_to_header_edge (loop, loop_latch_edge (loop), | |
| 752 max_unroll, | |
| 753 wont_exit, desc->out_edge, | |
| 754 &remove_edges, | |
| 755 DLTHE_FLAG_UPDATE_FREQ | |
| 756 | (opt_info | |
| 757 ? DLTHE_RECORD_COPY_NUMBER | |
| 758 : 0)); | |
| 759 gcc_assert (ok); | |
| 760 | |
| 761 if (opt_info) | |
| 762 { | |
| 763 apply_opt_in_copies (opt_info, max_unroll, true, true); | |
| 764 free_opt_info (opt_info); | |
| 765 } | |
| 766 | |
| 767 free (wont_exit); | |
| 768 | |
| 769 if (exit_at_end) | |
| 770 { | |
| 771 basic_block exit_block = get_bb_copy (desc->in_edge->src); | |
| 772 /* Find a new in and out edge; they are in the last copy we have made. */ | |
|
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773 |
| 0 | 774 if (EDGE_SUCC (exit_block, 0)->dest == desc->out_edge->dest) |
| 775 { | |
| 776 desc->out_edge = EDGE_SUCC (exit_block, 0); | |
| 777 desc->in_edge = EDGE_SUCC (exit_block, 1); | |
| 778 } | |
| 779 else | |
| 780 { | |
| 781 desc->out_edge = EDGE_SUCC (exit_block, 1); | |
| 782 desc->in_edge = EDGE_SUCC (exit_block, 0); | |
| 783 } | |
| 784 } | |
| 785 | |
| 786 desc->niter /= max_unroll + 1; | |
| 787 desc->niter_max /= max_unroll + 1; | |
| 788 desc->niter_expr = GEN_INT (desc->niter); | |
| 789 | |
| 790 /* Remove the edges. */ | |
| 791 for (i = 0; VEC_iterate (edge, remove_edges, i, e); i++) | |
| 792 remove_path (e); | |
| 793 VEC_free (edge, heap, remove_edges); | |
| 794 | |
| 795 if (dump_file) | |
| 796 fprintf (dump_file, | |
| 797 ";; Unrolled loop %d times, constant # of iterations %i insns\n", | |
| 798 max_unroll, num_loop_insns (loop)); | |
| 799 } | |
| 800 | |
| 801 /* Decide whether to unroll LOOP iterating runtime computable number of times | |
| 802 and how much. */ | |
| 803 static void | |
| 804 decide_unroll_runtime_iterations (struct loop *loop, int flags) | |
| 805 { | |
| 806 unsigned nunroll, nunroll_by_av, i; | |
| 807 struct niter_desc *desc; | |
| 808 | |
| 809 if (!(flags & UAP_UNROLL)) | |
| 810 { | |
| 811 /* We were not asked to, just return back silently. */ | |
| 812 return; | |
| 813 } | |
| 814 | |
| 815 if (dump_file) | |
| 816 fprintf (dump_file, | |
| 817 "\n;; Considering unrolling loop with runtime " | |
| 818 "computable number of iterations\n"); | |
| 819 | |
| 820 /* nunroll = total number of copies of the original loop body in | |
| 821 unrolled loop (i.e. if it is 2, we have to duplicate loop body once. */ | |
| 822 nunroll = PARAM_VALUE (PARAM_MAX_UNROLLED_INSNS) / loop->ninsns; | |
| 823 nunroll_by_av = PARAM_VALUE (PARAM_MAX_AVERAGE_UNROLLED_INSNS) / loop->av_ninsns; | |
| 824 if (nunroll > nunroll_by_av) | |
| 825 nunroll = nunroll_by_av; | |
| 826 if (nunroll > (unsigned) PARAM_VALUE (PARAM_MAX_UNROLL_TIMES)) | |
| 827 nunroll = PARAM_VALUE (PARAM_MAX_UNROLL_TIMES); | |
| 828 | |
| 829 /* Skip big loops. */ | |
| 830 if (nunroll <= 1) | |
| 831 { | |
| 832 if (dump_file) | |
| 833 fprintf (dump_file, ";; Not considering loop, is too big\n"); | |
| 834 return; | |
| 835 } | |
| 836 | |
| 837 /* Check for simple loops. */ | |
| 838 desc = get_simple_loop_desc (loop); | |
| 839 | |
| 840 /* Check simpleness. */ | |
| 841 if (!desc->simple_p || desc->assumptions) | |
| 842 { | |
| 843 if (dump_file) | |
| 844 fprintf (dump_file, | |
| 845 ";; Unable to prove that the number of iterations " | |
| 846 "can be counted in runtime\n"); | |
| 847 return; | |
| 848 } | |
| 849 | |
| 850 if (desc->const_iter) | |
| 851 { | |
| 852 if (dump_file) | |
| 853 fprintf (dump_file, ";; Loop iterates constant times\n"); | |
| 854 return; | |
| 855 } | |
| 856 | |
| 857 /* If we have profile feedback, check whether the loop rolls. */ | |
| 858 if (loop->header->count && expected_loop_iterations (loop) < 2 * nunroll) | |
| 859 { | |
| 860 if (dump_file) | |
| 861 fprintf (dump_file, ";; Not unrolling loop, doesn't roll\n"); | |
| 862 return; | |
| 863 } | |
| 864 | |
| 865 /* Success; now force nunroll to be power of 2, as we are unable to | |
| 866 cope with overflows in computation of number of iterations. */ | |
| 867 for (i = 1; 2 * i <= nunroll; i *= 2) | |
| 868 continue; | |
| 869 | |
| 870 loop->lpt_decision.decision = LPT_UNROLL_RUNTIME; | |
| 871 loop->lpt_decision.times = i - 1; | |
|
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872 |
| 0 | 873 if (dump_file) |
| 874 fprintf (dump_file, | |
| 875 ";; Decided to unroll the runtime computable " | |
| 876 "times rolling loop, %d times.\n", | |
| 877 loop->lpt_decision.times); | |
| 878 } | |
| 879 | |
| 880 /* Splits edge E and inserts the sequence of instructions INSNS on it, and | |
| 881 returns the newly created block. If INSNS is NULL_RTX, nothing is changed | |
| 882 and NULL is returned instead. */ | |
| 883 | |
| 884 basic_block | |
| 885 split_edge_and_insert (edge e, rtx insns) | |
| 886 { | |
| 887 basic_block bb; | |
| 888 | |
| 889 if (!insns) | |
| 890 return NULL; | |
|
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891 bb = split_edge (e); |
| 0 | 892 emit_insn_after (insns, BB_END (bb)); |
| 893 | |
| 894 /* ??? We used to assume that INSNS can contain control flow insns, and | |
| 895 that we had to try to find sub basic blocks in BB to maintain a valid | |
| 896 CFG. For this purpose we used to set the BB_SUPERBLOCK flag on BB | |
| 897 and call break_superblocks when going out of cfglayout mode. But it | |
| 898 turns out that this never happens; and that if it does ever happen, | |
| 899 the verify_flow_info call in loop_optimizer_finalize would fail. | |
| 900 | |
| 901 There are two reasons why we expected we could have control flow insns | |
| 902 in INSNS. The first is when a comparison has to be done in parts, and | |
| 903 the second is when the number of iterations is computed for loops with | |
| 904 the number of iterations known at runtime. In both cases, test cases | |
| 905 to get control flow in INSNS appear to be impossible to construct: | |
| 906 | |
| 907 * If do_compare_rtx_and_jump needs several branches to do comparison | |
| 908 in a mode that needs comparison by parts, we cannot analyze the | |
| 909 number of iterations of the loop, and we never get to unrolling it. | |
| 910 | |
| 911 * The code in expand_divmod that was suspected to cause creation of | |
| 912 branching code seems to be only accessed for signed division. The | |
| 913 divisions used by # of iterations analysis are always unsigned. | |
| 914 Problems might arise on architectures that emits branching code | |
| 915 for some operations that may appear in the unroller (especially | |
| 916 for division), but we have no such architectures. | |
| 917 | |
| 918 Considering all this, it was decided that we should for now assume | |
| 919 that INSNS can in theory contain control flow insns, but in practice | |
| 920 it never does. So we don't handle the theoretical case, and should | |
| 921 a real failure ever show up, we have a pretty good clue for how to | |
| 922 fix it. */ | |
| 923 | |
| 924 return bb; | |
| 925 } | |
| 926 | |
| 927 /* Unroll LOOP for that we are able to count number of iterations in runtime | |
| 928 LOOP->LPT_DECISION.TIMES + 1 times. The transformation does this (with some | |
| 929 extra care for case n < 0): | |
| 930 | |
| 931 for (i = 0; i < n; i++) | |
| 932 body; | |
| 933 | |
| 934 ==> | |
| 935 | |
| 936 i = 0; | |
| 937 mod = n % 4; | |
| 938 | |
| 939 switch (mod) | |
| 940 { | |
| 941 case 3: | |
| 942 body; i++; | |
| 943 case 2: | |
| 944 body; i++; | |
| 945 case 1: | |
| 946 body; i++; | |
| 947 case 0: ; | |
| 948 } | |
| 949 | |
| 950 while (i < n) | |
| 951 { | |
| 952 body; i++; | |
| 953 body; i++; | |
| 954 body; i++; | |
| 955 body; i++; | |
| 956 } | |
| 957 */ | |
| 958 static void | |
| 959 unroll_loop_runtime_iterations (struct loop *loop) | |
| 960 { | |
| 961 rtx old_niter, niter, init_code, branch_code, tmp; | |
| 962 unsigned i, j, p; | |
| 963 basic_block preheader, *body, swtch, ezc_swtch; | |
| 964 VEC (basic_block, heap) *dom_bbs; | |
| 965 sbitmap wont_exit; | |
| 966 int may_exit_copy; | |
| 967 unsigned n_peel; | |
| 968 VEC (edge, heap) *remove_edges; | |
| 969 edge e; | |
| 970 bool extra_zero_check, last_may_exit; | |
| 971 unsigned max_unroll = loop->lpt_decision.times; | |
| 972 struct niter_desc *desc = get_simple_loop_desc (loop); | |
| 973 bool exit_at_end = loop_exit_at_end_p (loop); | |
| 974 struct opt_info *opt_info = NULL; | |
| 975 bool ok; | |
|
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976 |
| 0 | 977 if (flag_split_ivs_in_unroller |
| 978 || flag_variable_expansion_in_unroller) | |
| 979 opt_info = analyze_insns_in_loop (loop); | |
|
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980 |
| 0 | 981 /* Remember blocks whose dominators will have to be updated. */ |
| 982 dom_bbs = NULL; | |
| 983 | |
| 984 body = get_loop_body (loop); | |
| 985 for (i = 0; i < loop->num_nodes; i++) | |
| 986 { | |
| 987 VEC (basic_block, heap) *ldom; | |
| 988 basic_block bb; | |
| 989 | |
| 990 ldom = get_dominated_by (CDI_DOMINATORS, body[i]); | |
| 991 for (j = 0; VEC_iterate (basic_block, ldom, j, bb); j++) | |
| 992 if (!flow_bb_inside_loop_p (loop, bb)) | |
| 993 VEC_safe_push (basic_block, heap, dom_bbs, bb); | |
| 994 | |
| 995 VEC_free (basic_block, heap, ldom); | |
| 996 } | |
| 997 free (body); | |
| 998 | |
| 999 if (!exit_at_end) | |
| 1000 { | |
| 1001 /* Leave exit in first copy (for explanation why see comment in | |
| 1002 unroll_loop_constant_iterations). */ | |
| 1003 may_exit_copy = 0; | |
| 1004 n_peel = max_unroll - 1; | |
| 1005 extra_zero_check = true; | |
| 1006 last_may_exit = false; | |
| 1007 } | |
| 1008 else | |
| 1009 { | |
| 1010 /* Leave exit in last copy (for explanation why see comment in | |
| 1011 unroll_loop_constant_iterations). */ | |
| 1012 may_exit_copy = max_unroll; | |
| 1013 n_peel = max_unroll; | |
| 1014 extra_zero_check = false; | |
| 1015 last_may_exit = true; | |
| 1016 } | |
| 1017 | |
| 1018 /* Get expression for number of iterations. */ | |
| 1019 start_sequence (); | |
| 1020 old_niter = niter = gen_reg_rtx (desc->mode); | |
| 1021 tmp = force_operand (copy_rtx (desc->niter_expr), niter); | |
| 1022 if (tmp != niter) | |
| 1023 emit_move_insn (niter, tmp); | |
| 1024 | |
| 1025 /* Count modulo by ANDing it with max_unroll; we use the fact that | |
| 1026 the number of unrollings is a power of two, and thus this is correct | |
| 1027 even if there is overflow in the computation. */ | |
| 1028 niter = expand_simple_binop (desc->mode, AND, | |
| 1029 niter, | |
| 1030 GEN_INT (max_unroll), | |
| 1031 NULL_RTX, 0, OPTAB_LIB_WIDEN); | |
| 1032 | |
| 1033 init_code = get_insns (); | |
| 1034 end_sequence (); | |
| 1035 unshare_all_rtl_in_chain (init_code); | |
| 1036 | |
| 1037 /* Precondition the loop. */ | |
| 1038 split_edge_and_insert (loop_preheader_edge (loop), init_code); | |
| 1039 | |
| 1040 remove_edges = NULL; | |
| 1041 | |
| 1042 wont_exit = sbitmap_alloc (max_unroll + 2); | |
| 1043 | |
| 1044 /* Peel the first copy of loop body (almost always we must leave exit test | |
| 1045 here; the only exception is when we have extra zero check and the number | |
| 1046 of iterations is reliable. Also record the place of (possible) extra | |
| 1047 zero check. */ | |
| 1048 sbitmap_zero (wont_exit); | |
| 1049 if (extra_zero_check | |
| 1050 && !desc->noloop_assumptions) | |
| 1051 SET_BIT (wont_exit, 1); | |
| 1052 ezc_swtch = loop_preheader_edge (loop)->src; | |
| 1053 ok = duplicate_loop_to_header_edge (loop, loop_preheader_edge (loop), | |
| 1054 1, wont_exit, desc->out_edge, | |
| 1055 &remove_edges, | |
| 1056 DLTHE_FLAG_UPDATE_FREQ); | |
| 1057 gcc_assert (ok); | |
| 1058 | |
| 1059 /* Record the place where switch will be built for preconditioning. */ | |
| 1060 swtch = split_edge (loop_preheader_edge (loop)); | |
| 1061 | |
| 1062 for (i = 0; i < n_peel; i++) | |
| 1063 { | |
| 1064 /* Peel the copy. */ | |
| 1065 sbitmap_zero (wont_exit); | |
| 1066 if (i != n_peel - 1 || !last_may_exit) | |
| 1067 SET_BIT (wont_exit, 1); | |
| 1068 ok = duplicate_loop_to_header_edge (loop, loop_preheader_edge (loop), | |
| 1069 1, wont_exit, desc->out_edge, | |
| 1070 &remove_edges, | |
| 1071 DLTHE_FLAG_UPDATE_FREQ); | |
| 1072 gcc_assert (ok); | |
| 1073 | |
| 1074 /* Create item for switch. */ | |
| 1075 j = n_peel - i - (extra_zero_check ? 0 : 1); | |
| 1076 p = REG_BR_PROB_BASE / (i + 2); | |
| 1077 | |
| 1078 preheader = split_edge (loop_preheader_edge (loop)); | |
| 1079 branch_code = compare_and_jump_seq (copy_rtx (niter), GEN_INT (j), EQ, | |
| 1080 block_label (preheader), p, | |
| 1081 NULL_RTX); | |
| 1082 | |
| 1083 /* We rely on the fact that the compare and jump cannot be optimized out, | |
| 1084 and hence the cfg we create is correct. */ | |
| 1085 gcc_assert (branch_code != NULL_RTX); | |
| 1086 | |
| 1087 swtch = split_edge_and_insert (single_pred_edge (swtch), branch_code); | |
| 1088 set_immediate_dominator (CDI_DOMINATORS, preheader, swtch); | |
| 1089 single_pred_edge (swtch)->probability = REG_BR_PROB_BASE - p; | |
| 1090 e = make_edge (swtch, preheader, | |
| 1091 single_succ_edge (swtch)->flags & EDGE_IRREDUCIBLE_LOOP); | |
| 1092 e->probability = p; | |
| 1093 } | |
| 1094 | |
| 1095 if (extra_zero_check) | |
| 1096 { | |
| 1097 /* Add branch for zero iterations. */ | |
| 1098 p = REG_BR_PROB_BASE / (max_unroll + 1); | |
| 1099 swtch = ezc_swtch; | |
| 1100 preheader = split_edge (loop_preheader_edge (loop)); | |
| 1101 branch_code = compare_and_jump_seq (copy_rtx (niter), const0_rtx, EQ, | |
| 1102 block_label (preheader), p, | |
| 1103 NULL_RTX); | |
| 1104 gcc_assert (branch_code != NULL_RTX); | |
| 1105 | |
| 1106 swtch = split_edge_and_insert (single_succ_edge (swtch), branch_code); | |
| 1107 set_immediate_dominator (CDI_DOMINATORS, preheader, swtch); | |
| 1108 single_succ_edge (swtch)->probability = REG_BR_PROB_BASE - p; | |
| 1109 e = make_edge (swtch, preheader, | |
| 1110 single_succ_edge (swtch)->flags & EDGE_IRREDUCIBLE_LOOP); | |
| 1111 e->probability = p; | |
| 1112 } | |
| 1113 | |
| 1114 /* Recount dominators for outer blocks. */ | |
| 1115 iterate_fix_dominators (CDI_DOMINATORS, dom_bbs, false); | |
| 1116 | |
| 1117 /* And unroll loop. */ | |
| 1118 | |
| 1119 sbitmap_ones (wont_exit); | |
| 1120 RESET_BIT (wont_exit, may_exit_copy); | |
| 1121 opt_info_start_duplication (opt_info); | |
|
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1122 |
| 0 | 1123 ok = duplicate_loop_to_header_edge (loop, loop_latch_edge (loop), |
| 1124 max_unroll, | |
| 1125 wont_exit, desc->out_edge, | |
| 1126 &remove_edges, | |
| 1127 DLTHE_FLAG_UPDATE_FREQ | |
| 1128 | (opt_info | |
| 1129 ? DLTHE_RECORD_COPY_NUMBER | |
| 1130 : 0)); | |
| 1131 gcc_assert (ok); | |
|
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1132 |
| 0 | 1133 if (opt_info) |
| 1134 { | |
| 1135 apply_opt_in_copies (opt_info, max_unroll, true, true); | |
| 1136 free_opt_info (opt_info); | |
| 1137 } | |
| 1138 | |
| 1139 free (wont_exit); | |
| 1140 | |
| 1141 if (exit_at_end) | |
| 1142 { | |
| 1143 basic_block exit_block = get_bb_copy (desc->in_edge->src); | |
| 1144 /* Find a new in and out edge; they are in the last copy we have | |
| 1145 made. */ | |
|
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1146 |
| 0 | 1147 if (EDGE_SUCC (exit_block, 0)->dest == desc->out_edge->dest) |
| 1148 { | |
| 1149 desc->out_edge = EDGE_SUCC (exit_block, 0); | |
| 1150 desc->in_edge = EDGE_SUCC (exit_block, 1); | |
| 1151 } | |
| 1152 else | |
| 1153 { | |
| 1154 desc->out_edge = EDGE_SUCC (exit_block, 1); | |
| 1155 desc->in_edge = EDGE_SUCC (exit_block, 0); | |
| 1156 } | |
| 1157 } | |
| 1158 | |
| 1159 /* Remove the edges. */ | |
| 1160 for (i = 0; VEC_iterate (edge, remove_edges, i, e); i++) | |
| 1161 remove_path (e); | |
| 1162 VEC_free (edge, heap, remove_edges); | |
| 1163 | |
| 1164 /* We must be careful when updating the number of iterations due to | |
| 1165 preconditioning and the fact that the value must be valid at entry | |
| 1166 of the loop. After passing through the above code, we see that | |
| 1167 the correct new number of iterations is this: */ | |
| 1168 gcc_assert (!desc->const_iter); | |
| 1169 desc->niter_expr = | |
| 1170 simplify_gen_binary (UDIV, desc->mode, old_niter, | |
| 1171 GEN_INT (max_unroll + 1)); | |
| 1172 desc->niter_max /= max_unroll + 1; | |
| 1173 if (exit_at_end) | |
| 1174 { | |
| 1175 desc->niter_expr = | |
| 1176 simplify_gen_binary (MINUS, desc->mode, desc->niter_expr, const1_rtx); | |
| 1177 desc->noloop_assumptions = NULL_RTX; | |
| 1178 desc->niter_max--; | |
| 1179 } | |
| 1180 | |
| 1181 if (dump_file) | |
| 1182 fprintf (dump_file, | |
| 1183 ";; Unrolled loop %d times, counting # of iterations " | |
| 1184 "in runtime, %i insns\n", | |
| 1185 max_unroll, num_loop_insns (loop)); | |
| 1186 | |
| 1187 VEC_free (basic_block, heap, dom_bbs); | |
| 1188 } | |
| 1189 | |
| 1190 /* Decide whether to simply peel LOOP and how much. */ | |
| 1191 static void | |
| 1192 decide_peel_simple (struct loop *loop, int flags) | |
| 1193 { | |
| 1194 unsigned npeel; | |
| 1195 struct niter_desc *desc; | |
| 1196 | |
| 1197 if (!(flags & UAP_PEEL)) | |
| 1198 { | |
| 1199 /* We were not asked to, just return back silently. */ | |
| 1200 return; | |
| 1201 } | |
| 1202 | |
| 1203 if (dump_file) | |
| 1204 fprintf (dump_file, "\n;; Considering simply peeling loop\n"); | |
| 1205 | |
| 1206 /* npeel = number of iterations to peel. */ | |
| 1207 npeel = PARAM_VALUE (PARAM_MAX_PEELED_INSNS) / loop->ninsns; | |
| 1208 if (npeel > (unsigned) PARAM_VALUE (PARAM_MAX_PEEL_TIMES)) | |
| 1209 npeel = PARAM_VALUE (PARAM_MAX_PEEL_TIMES); | |
| 1210 | |
| 1211 /* Skip big loops. */ | |
| 1212 if (!npeel) | |
| 1213 { | |
| 1214 if (dump_file) | |
| 1215 fprintf (dump_file, ";; Not considering loop, is too big\n"); | |
| 1216 return; | |
| 1217 } | |
| 1218 | |
| 1219 /* Check for simple loops. */ | |
| 1220 desc = get_simple_loop_desc (loop); | |
| 1221 | |
| 1222 /* Check number of iterations. */ | |
| 1223 if (desc->simple_p && !desc->assumptions && desc->const_iter) | |
| 1224 { | |
| 1225 if (dump_file) | |
| 1226 fprintf (dump_file, ";; Loop iterates constant times\n"); | |
| 1227 return; | |
| 1228 } | |
| 1229 | |
| 1230 /* Do not simply peel loops with branches inside -- it increases number | |
| 1231 of mispredicts. */ | |
| 1232 if (num_loop_branches (loop) > 1) | |
| 1233 { | |
| 1234 if (dump_file) | |
| 1235 fprintf (dump_file, ";; Not peeling, contains branches\n"); | |
| 1236 return; | |
| 1237 } | |
| 1238 | |
| 1239 if (loop->header->count) | |
| 1240 { | |
| 1241 unsigned niter = expected_loop_iterations (loop); | |
| 1242 if (niter + 1 > npeel) | |
| 1243 { | |
| 1244 if (dump_file) | |
| 1245 { | |
| 1246 fprintf (dump_file, ";; Not peeling loop, rolls too much ("); | |
| 1247 fprintf (dump_file, HOST_WIDEST_INT_PRINT_DEC, | |
| 1248 (HOST_WIDEST_INT) (niter + 1)); | |
| 1249 fprintf (dump_file, " iterations > %d [maximum peelings])\n", | |
| 1250 npeel); | |
| 1251 } | |
| 1252 return; | |
| 1253 } | |
| 1254 npeel = niter + 1; | |
| 1255 } | |
| 1256 else | |
| 1257 { | |
| 1258 /* For now we have no good heuristics to decide whether loop peeling | |
| 1259 will be effective, so disable it. */ | |
| 1260 if (dump_file) | |
| 1261 fprintf (dump_file, | |
| 1262 ";; Not peeling loop, no evidence it will be profitable\n"); | |
| 1263 return; | |
| 1264 } | |
| 1265 | |
| 1266 /* Success. */ | |
| 1267 loop->lpt_decision.decision = LPT_PEEL_SIMPLE; | |
| 1268 loop->lpt_decision.times = npeel; | |
|
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|
1269 |
| 0 | 1270 if (dump_file) |
| 1271 fprintf (dump_file, ";; Decided to simply peel the loop, %d times.\n", | |
| 1272 loop->lpt_decision.times); | |
| 1273 } | |
| 1274 | |
| 1275 /* Peel a LOOP LOOP->LPT_DECISION.TIMES times. The transformation: | |
| 1276 while (cond) | |
| 1277 body; | |
| 1278 | |
| 1279 ==> | |
| 1280 | |
| 1281 if (!cond) goto end; | |
| 1282 body; | |
| 1283 if (!cond) goto end; | |
| 1284 body; | |
| 1285 while (cond) | |
| 1286 body; | |
| 1287 end: ; | |
| 1288 */ | |
| 1289 static void | |
| 1290 peel_loop_simple (struct loop *loop) | |
| 1291 { | |
| 1292 sbitmap wont_exit; | |
| 1293 unsigned npeel = loop->lpt_decision.times; | |
| 1294 struct niter_desc *desc = get_simple_loop_desc (loop); | |
| 1295 struct opt_info *opt_info = NULL; | |
| 1296 bool ok; | |
|
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|
1297 |
| 0 | 1298 if (flag_split_ivs_in_unroller && npeel > 1) |
| 1299 opt_info = analyze_insns_in_loop (loop); | |
|
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|
1300 |
| 0 | 1301 wont_exit = sbitmap_alloc (npeel + 1); |
| 1302 sbitmap_zero (wont_exit); | |
|
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|
1303 |
| 0 | 1304 opt_info_start_duplication (opt_info); |
|
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1305 |
| 0 | 1306 ok = duplicate_loop_to_header_edge (loop, loop_preheader_edge (loop), |
| 1307 npeel, wont_exit, NULL, | |
| 1308 NULL, DLTHE_FLAG_UPDATE_FREQ | |
| 1309 | (opt_info | |
| 1310 ? DLTHE_RECORD_COPY_NUMBER | |
| 1311 : 0)); | |
| 1312 gcc_assert (ok); | |
| 1313 | |
| 1314 free (wont_exit); | |
|
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|
1315 |
| 0 | 1316 if (opt_info) |
| 1317 { | |
| 1318 apply_opt_in_copies (opt_info, npeel, false, false); | |
| 1319 free_opt_info (opt_info); | |
| 1320 } | |
| 1321 | |
| 1322 if (desc->simple_p) | |
| 1323 { | |
| 1324 if (desc->const_iter) | |
| 1325 { | |
| 1326 desc->niter -= npeel; | |
| 1327 desc->niter_expr = GEN_INT (desc->niter); | |
| 1328 desc->noloop_assumptions = NULL_RTX; | |
| 1329 } | |
| 1330 else | |
| 1331 { | |
| 1332 /* We cannot just update niter_expr, as its value might be clobbered | |
| 1333 inside loop. We could handle this by counting the number into | |
| 1334 temporary just like we do in runtime unrolling, but it does not | |
| 1335 seem worthwhile. */ | |
| 1336 free_simple_loop_desc (loop); | |
| 1337 } | |
| 1338 } | |
| 1339 if (dump_file) | |
| 1340 fprintf (dump_file, ";; Peeling loop %d times\n", npeel); | |
| 1341 } | |
| 1342 | |
| 1343 /* Decide whether to unroll LOOP stupidly and how much. */ | |
| 1344 static void | |
| 1345 decide_unroll_stupid (struct loop *loop, int flags) | |
| 1346 { | |
| 1347 unsigned nunroll, nunroll_by_av, i; | |
| 1348 struct niter_desc *desc; | |
| 1349 | |
| 1350 if (!(flags & UAP_UNROLL_ALL)) | |
| 1351 { | |
| 1352 /* We were not asked to, just return back silently. */ | |
| 1353 return; | |
| 1354 } | |
| 1355 | |
| 1356 if (dump_file) | |
| 1357 fprintf (dump_file, "\n;; Considering unrolling loop stupidly\n"); | |
| 1358 | |
| 1359 /* nunroll = total number of copies of the original loop body in | |
| 1360 unrolled loop (i.e. if it is 2, we have to duplicate loop body once. */ | |
| 1361 nunroll = PARAM_VALUE (PARAM_MAX_UNROLLED_INSNS) / loop->ninsns; | |
| 1362 nunroll_by_av | |
| 1363 = PARAM_VALUE (PARAM_MAX_AVERAGE_UNROLLED_INSNS) / loop->av_ninsns; | |
| 1364 if (nunroll > nunroll_by_av) | |
| 1365 nunroll = nunroll_by_av; | |
| 1366 if (nunroll > (unsigned) PARAM_VALUE (PARAM_MAX_UNROLL_TIMES)) | |
| 1367 nunroll = PARAM_VALUE (PARAM_MAX_UNROLL_TIMES); | |
| 1368 | |
| 1369 /* Skip big loops. */ | |
| 1370 if (nunroll <= 1) | |
| 1371 { | |
| 1372 if (dump_file) | |
| 1373 fprintf (dump_file, ";; Not considering loop, is too big\n"); | |
| 1374 return; | |
| 1375 } | |
| 1376 | |
| 1377 /* Check for simple loops. */ | |
| 1378 desc = get_simple_loop_desc (loop); | |
| 1379 | |
| 1380 /* Check simpleness. */ | |
| 1381 if (desc->simple_p && !desc->assumptions) | |
| 1382 { | |
| 1383 if (dump_file) | |
| 1384 fprintf (dump_file, ";; The loop is simple\n"); | |
| 1385 return; | |
| 1386 } | |
| 1387 | |
| 1388 /* Do not unroll loops with branches inside -- it increases number | |
| 1389 of mispredicts. */ | |
| 1390 if (num_loop_branches (loop) > 1) | |
| 1391 { | |
| 1392 if (dump_file) | |
| 1393 fprintf (dump_file, ";; Not unrolling, contains branches\n"); | |
| 1394 return; | |
| 1395 } | |
| 1396 | |
| 1397 /* If we have profile feedback, check whether the loop rolls. */ | |
| 1398 if (loop->header->count | |
| 1399 && expected_loop_iterations (loop) < 2 * nunroll) | |
| 1400 { | |
| 1401 if (dump_file) | |
| 1402 fprintf (dump_file, ";; Not unrolling loop, doesn't roll\n"); | |
| 1403 return; | |
| 1404 } | |
| 1405 | |
| 1406 /* Success. Now force nunroll to be power of 2, as it seems that this | |
| 1407 improves results (partially because of better alignments, partially | |
| 1408 because of some dark magic). */ | |
| 1409 for (i = 1; 2 * i <= nunroll; i *= 2) | |
| 1410 continue; | |
| 1411 | |
| 1412 loop->lpt_decision.decision = LPT_UNROLL_STUPID; | |
| 1413 loop->lpt_decision.times = i - 1; | |
|
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1414 |
| 0 | 1415 if (dump_file) |
| 1416 fprintf (dump_file, | |
| 1417 ";; Decided to unroll the loop stupidly, %d times.\n", | |
| 1418 loop->lpt_decision.times); | |
| 1419 } | |
| 1420 | |
| 1421 /* Unroll a LOOP LOOP->LPT_DECISION.TIMES times. The transformation: | |
| 1422 while (cond) | |
| 1423 body; | |
| 1424 | |
| 1425 ==> | |
| 1426 | |
| 1427 while (cond) | |
| 1428 { | |
| 1429 body; | |
| 1430 if (!cond) break; | |
| 1431 body; | |
| 1432 if (!cond) break; | |
| 1433 body; | |
| 1434 if (!cond) break; | |
| 1435 body; | |
| 1436 } | |
| 1437 */ | |
| 1438 static void | |
| 1439 unroll_loop_stupid (struct loop *loop) | |
| 1440 { | |
| 1441 sbitmap wont_exit; | |
| 1442 unsigned nunroll = loop->lpt_decision.times; | |
| 1443 struct niter_desc *desc = get_simple_loop_desc (loop); | |
| 1444 struct opt_info *opt_info = NULL; | |
| 1445 bool ok; | |
|
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1446 |
| 0 | 1447 if (flag_split_ivs_in_unroller |
| 1448 || flag_variable_expansion_in_unroller) | |
| 1449 opt_info = analyze_insns_in_loop (loop); | |
|
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1450 |
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1451 |
| 0 | 1452 wont_exit = sbitmap_alloc (nunroll + 1); |
| 1453 sbitmap_zero (wont_exit); | |
| 1454 opt_info_start_duplication (opt_info); | |
|
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1455 |
| 0 | 1456 ok = duplicate_loop_to_header_edge (loop, loop_latch_edge (loop), |
| 1457 nunroll, wont_exit, | |
| 1458 NULL, NULL, | |
| 1459 DLTHE_FLAG_UPDATE_FREQ | |
| 1460 | (opt_info | |
| 1461 ? DLTHE_RECORD_COPY_NUMBER | |
| 1462 : 0)); | |
| 1463 gcc_assert (ok); | |
|
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1464 |
| 0 | 1465 if (opt_info) |
| 1466 { | |
| 1467 apply_opt_in_copies (opt_info, nunroll, true, true); | |
| 1468 free_opt_info (opt_info); | |
| 1469 } | |
| 1470 | |
| 1471 free (wont_exit); | |
| 1472 | |
| 1473 if (desc->simple_p) | |
| 1474 { | |
| 1475 /* We indeed may get here provided that there are nontrivial assumptions | |
| 1476 for a loop to be really simple. We could update the counts, but the | |
| 1477 problem is that we are unable to decide which exit will be taken | |
| 1478 (not really true in case the number of iterations is constant, | |
| 1479 but noone will do anything with this information, so we do not | |
| 1480 worry about it). */ | |
| 1481 desc->simple_p = false; | |
| 1482 } | |
| 1483 | |
| 1484 if (dump_file) | |
| 1485 fprintf (dump_file, ";; Unrolled loop %d times, %i insns\n", | |
| 1486 nunroll, num_loop_insns (loop)); | |
| 1487 } | |
| 1488 | |
| 1489 /* A hash function for information about insns to split. */ | |
| 1490 | |
| 1491 static hashval_t | |
| 1492 si_info_hash (const void *ivts) | |
| 1493 { | |
| 1494 return (hashval_t) INSN_UID (((const struct iv_to_split *) ivts)->insn); | |
| 1495 } | |
| 1496 | |
| 1497 /* An equality functions for information about insns to split. */ | |
| 1498 | |
| 1499 static int | |
| 1500 si_info_eq (const void *ivts1, const void *ivts2) | |
| 1501 { | |
| 1502 const struct iv_to_split *const i1 = (const struct iv_to_split *) ivts1; | |
| 1503 const struct iv_to_split *const i2 = (const struct iv_to_split *) ivts2; | |
| 1504 | |
| 1505 return i1->insn == i2->insn; | |
| 1506 } | |
| 1507 | |
| 1508 /* Return a hash for VES, which is really a "var_to_expand *". */ | |
| 1509 | |
| 1510 static hashval_t | |
| 1511 ve_info_hash (const void *ves) | |
| 1512 { | |
| 1513 return (hashval_t) INSN_UID (((const struct var_to_expand *) ves)->insn); | |
| 1514 } | |
| 1515 | |
|
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1516 /* Return true if IVTS1 and IVTS2 (which are really both of type |
| 0 | 1517 "var_to_expand *") refer to the same instruction. */ |
| 1518 | |
| 1519 static int | |
| 1520 ve_info_eq (const void *ivts1, const void *ivts2) | |
| 1521 { | |
| 1522 const struct var_to_expand *const i1 = (const struct var_to_expand *) ivts1; | |
| 1523 const struct var_to_expand *const i2 = (const struct var_to_expand *) ivts2; | |
|
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1524 |
| 0 | 1525 return i1->insn == i2->insn; |
| 1526 } | |
| 1527 | |
| 1528 /* Returns true if REG is referenced in one insn in LOOP. */ | |
| 1529 | |
| 1530 bool | |
| 1531 referenced_in_one_insn_in_loop_p (struct loop *loop, rtx reg) | |
| 1532 { | |
| 1533 basic_block *body, bb; | |
| 1534 unsigned i; | |
| 1535 int count_ref = 0; | |
| 1536 rtx insn; | |
|
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1537 |
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1538 body = get_loop_body (loop); |
| 0 | 1539 for (i = 0; i < loop->num_nodes; i++) |
| 1540 { | |
| 1541 bb = body[i]; | |
|
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1542 |
| 0 | 1543 FOR_BB_INSNS (bb, insn) |
| 1544 { | |
| 1545 if (rtx_referenced_p (reg, insn)) | |
| 1546 count_ref++; | |
| 1547 } | |
| 1548 } | |
| 1549 return (count_ref == 1); | |
| 1550 } | |
| 1551 | |
| 1552 /* Determine whether INSN contains an accumulator | |
|
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1553 which can be expanded into separate copies, |
| 0 | 1554 one for each copy of the LOOP body. |
|
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1555 |
| 0 | 1556 for (i = 0 ; i < n; i++) |
| 1557 sum += a[i]; | |
|
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1558 |
| 0 | 1559 ==> |
|
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1560 |
| 0 | 1561 sum += a[i] |
| 1562 .... | |
| 1563 i = i+1; | |
| 1564 sum1 += a[i] | |
| 1565 .... | |
| 1566 i = i+1 | |
| 1567 sum2 += a[i]; | |
| 1568 .... | |
| 1569 | |
|
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1570 Return NULL if INSN contains no opportunity for expansion of accumulator. |
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1571 Otherwise, allocate a VAR_TO_EXPAND structure, fill it with the relevant |
| 0 | 1572 information and return a pointer to it. |
| 1573 */ | |
| 1574 | |
| 1575 static struct var_to_expand * | |
| 1576 analyze_insn_to_expand_var (struct loop *loop, rtx insn) | |
| 1577 { | |
| 1578 rtx set, dest, src, op1, op2, something; | |
| 1579 struct var_to_expand *ves; | |
| 1580 enum machine_mode mode1, mode2; | |
| 1581 unsigned accum_pos; | |
| 1582 | |
| 1583 set = single_set (insn); | |
| 1584 if (!set) | |
| 1585 return NULL; | |
|
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1586 |
| 0 | 1587 dest = SET_DEST (set); |
| 1588 src = SET_SRC (set); | |
|
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1589 |
| 0 | 1590 if (GET_CODE (src) != PLUS |
| 1591 && GET_CODE (src) != MINUS | |
| 1592 && GET_CODE (src) != MULT) | |
| 1593 return NULL; | |
| 1594 | |
| 1595 /* Hmm, this is a bit paradoxical. We know that INSN is a valid insn | |
| 1596 in MD. But if there is no optab to generate the insn, we can not | |
| 1597 perform the variable expansion. This can happen if an MD provides | |
| 1598 an insn but not a named pattern to generate it, for example to avoid | |
| 1599 producing code that needs additional mode switches like for x87/mmx. | |
| 1600 | |
| 1601 So we check have_insn_for which looks for an optab for the operation | |
| 1602 in SRC. If it doesn't exist, we can't perform the expansion even | |
| 1603 though INSN is valid. */ | |
| 1604 if (!have_insn_for (GET_CODE (src), GET_MODE (src))) | |
| 1605 return NULL; | |
| 1606 | |
| 1607 op1 = XEXP (src, 0); | |
| 1608 op2 = XEXP (src, 1); | |
|
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1609 |
| 0 | 1610 if (!REG_P (dest) |
| 1611 && !(GET_CODE (dest) == SUBREG | |
| 1612 && REG_P (SUBREG_REG (dest)))) | |
| 1613 return NULL; | |
|
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1614 |
| 0 | 1615 if (rtx_equal_p (dest, op1)) |
| 1616 accum_pos = 0; | |
| 1617 else if (rtx_equal_p (dest, op2)) | |
| 1618 accum_pos = 1; | |
| 1619 else | |
| 1620 return NULL; | |
| 1621 | |
| 1622 /* The method of expansion that we are using; which includes | |
| 1623 the initialization of the expansions with zero and the summation of | |
| 1624 the expansions at the end of the computation will yield wrong results | |
| 1625 for (x = something - x) thus avoid using it in that case. */ | |
|
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1626 if (accum_pos == 1 |
| 0 | 1627 && GET_CODE (src) == MINUS) |
| 1628 return NULL; | |
| 1629 | |
| 1630 something = (accum_pos == 0)? op2 : op1; | |
| 1631 | |
| 1632 if (!referenced_in_one_insn_in_loop_p (loop, dest)) | |
| 1633 return NULL; | |
|
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1634 |
| 0 | 1635 if (rtx_referenced_p (dest, something)) |
| 1636 return NULL; | |
|
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1637 |
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1638 mode1 = GET_MODE (dest); |
| 0 | 1639 mode2 = GET_MODE (something); |
|
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1640 if ((FLOAT_MODE_P (mode1) |
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1641 || FLOAT_MODE_P (mode2)) |
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1642 && !flag_associative_math) |
| 0 | 1643 return NULL; |
| 1644 | |
| 1645 if (dump_file) | |
| 1646 { | |
| 1647 fprintf (dump_file, | |
| 1648 "\n;; Expanding Accumulator "); | |
| 1649 print_rtl (dump_file, dest); | |
| 1650 fprintf (dump_file, "\n"); | |
| 1651 } | |
| 1652 | |
| 1653 /* Record the accumulator to expand. */ | |
| 1654 ves = XNEW (struct var_to_expand); | |
| 1655 ves->insn = insn; | |
|
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1656 ves->reg = copy_rtx (dest); |
| 0 | 1657 ves->var_expansions = VEC_alloc (rtx, heap, 1); |
|
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1658 ves->next = NULL; |
| 0 | 1659 ves->op = GET_CODE (src); |
| 1660 ves->expansion_count = 0; | |
| 1661 ves->reuse_expansion = 0; | |
| 1662 ves->accum_pos = accum_pos; | |
|
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1663 return ves; |
| 0 | 1664 } |
| 1665 | |
| 1666 /* Determine whether there is an induction variable in INSN that | |
|
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1667 we would like to split during unrolling. |
| 0 | 1668 |
| 1669 I.e. replace | |
| 1670 | |
| 1671 i = i + 1; | |
| 1672 ... | |
| 1673 i = i + 1; | |
| 1674 ... | |
| 1675 i = i + 1; | |
| 1676 ... | |
| 1677 | |
| 1678 type chains by | |
| 1679 | |
| 1680 i0 = i + 1 | |
| 1681 ... | |
| 1682 i = i0 + 1 | |
| 1683 ... | |
| 1684 i = i0 + 2 | |
| 1685 ... | |
| 1686 | |
|
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1687 Return NULL if INSN contains no interesting IVs. Otherwise, allocate |
| 0 | 1688 an IV_TO_SPLIT structure, fill it with the relevant information and return a |
| 1689 pointer to it. */ | |
| 1690 | |
| 1691 static struct iv_to_split * | |
| 1692 analyze_iv_to_split_insn (rtx insn) | |
| 1693 { | |
| 1694 rtx set, dest; | |
| 1695 struct rtx_iv iv; | |
| 1696 struct iv_to_split *ivts; | |
| 1697 bool ok; | |
| 1698 | |
| 1699 /* For now we just split the basic induction variables. Later this may be | |
| 1700 extended for example by selecting also addresses of memory references. */ | |
| 1701 set = single_set (insn); | |
| 1702 if (!set) | |
| 1703 return NULL; | |
| 1704 | |
| 1705 dest = SET_DEST (set); | |
| 1706 if (!REG_P (dest)) | |
| 1707 return NULL; | |
| 1708 | |
| 1709 if (!biv_p (insn, dest)) | |
| 1710 return NULL; | |
| 1711 | |
| 1712 ok = iv_analyze_result (insn, dest, &iv); | |
| 1713 | |
| 1714 /* This used to be an assert under the assumption that if biv_p returns | |
| 1715 true that iv_analyze_result must also return true. However, that | |
| 1716 assumption is not strictly correct as evidenced by pr25569. | |
| 1717 | |
| 1718 Returning NULL when iv_analyze_result returns false is safe and | |
| 1719 avoids the problems in pr25569 until the iv_analyze_* routines | |
| 1720 can be fixed, which is apparently hard and time consuming | |
| 1721 according to their author. */ | |
| 1722 if (! ok) | |
| 1723 return NULL; | |
| 1724 | |
| 1725 if (iv.step == const0_rtx | |
| 1726 || iv.mode != iv.extend_mode) | |
| 1727 return NULL; | |
| 1728 | |
| 1729 /* Record the insn to split. */ | |
| 1730 ivts = XNEW (struct iv_to_split); | |
| 1731 ivts->insn = insn; | |
| 1732 ivts->base_var = NULL_RTX; | |
| 1733 ivts->step = iv.step; | |
|
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1734 ivts->next = NULL; |
| 0 | 1735 ivts->n_loc = 1; |
| 1736 ivts->loc[0] = 1; | |
|
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1737 |
| 0 | 1738 return ivts; |
| 1739 } | |
| 1740 | |
| 1741 /* Determines which of insns in LOOP can be optimized. | |
| 1742 Return a OPT_INFO struct with the relevant hash tables filled | |
| 1743 with all insns to be optimized. The FIRST_NEW_BLOCK field | |
| 1744 is undefined for the return value. */ | |
| 1745 | |
| 1746 static struct opt_info * | |
| 1747 analyze_insns_in_loop (struct loop *loop) | |
| 1748 { | |
| 1749 basic_block *body, bb; | |
| 1750 unsigned i; | |
| 1751 struct opt_info *opt_info = XCNEW (struct opt_info); | |
| 1752 rtx insn; | |
| 1753 struct iv_to_split *ivts = NULL; | |
| 1754 struct var_to_expand *ves = NULL; | |
| 1755 PTR *slot1; | |
| 1756 PTR *slot2; | |
| 1757 VEC (edge, heap) *edges = get_loop_exit_edges (loop); | |
| 1758 edge exit; | |
| 1759 bool can_apply = false; | |
|
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1760 |
| 0 | 1761 iv_analysis_loop_init (loop); |
| 1762 | |
| 1763 body = get_loop_body (loop); | |
| 1764 | |
| 1765 if (flag_split_ivs_in_unroller) | |
|
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1766 { |
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1767 opt_info->insns_to_split = htab_create (5 * loop->num_nodes, |
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1768 si_info_hash, si_info_eq, free); |
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1769 opt_info->iv_to_split_head = NULL; |
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1770 opt_info->iv_to_split_tail = &opt_info->iv_to_split_head; |
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1771 } |
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1772 |
| 0 | 1773 /* Record the loop exit bb and loop preheader before the unrolling. */ |
| 1774 opt_info->loop_preheader = loop_preheader_edge (loop)->src; | |
|
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1775 |
| 0 | 1776 if (VEC_length (edge, edges) == 1) |
| 1777 { | |
| 1778 exit = VEC_index (edge, edges, 0); | |
| 1779 if (!(exit->flags & EDGE_COMPLEX)) | |
| 1780 { | |
| 1781 opt_info->loop_exit = split_edge (exit); | |
| 1782 can_apply = true; | |
| 1783 } | |
| 1784 } | |
|
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1785 |
| 0 | 1786 if (flag_variable_expansion_in_unroller |
| 1787 && can_apply) | |
|
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1788 { |
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1789 opt_info->insns_with_var_to_expand = htab_create (5 * loop->num_nodes, |
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1790 ve_info_hash, |
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1791 ve_info_eq, free); |
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1792 opt_info->var_to_expand_head = NULL; |
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1793 opt_info->var_to_expand_tail = &opt_info->var_to_expand_head; |
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1794 } |
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1795 |
| 0 | 1796 for (i = 0; i < loop->num_nodes; i++) |
| 1797 { | |
| 1798 bb = body[i]; | |
| 1799 if (!dominated_by_p (CDI_DOMINATORS, loop->latch, bb)) | |
| 1800 continue; | |
| 1801 | |
| 1802 FOR_BB_INSNS (bb, insn) | |
| 1803 { | |
| 1804 if (!INSN_P (insn)) | |
| 1805 continue; | |
|
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1806 |
| 0 | 1807 if (opt_info->insns_to_split) |
| 1808 ivts = analyze_iv_to_split_insn (insn); | |
|
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1809 |
| 0 | 1810 if (ivts) |
| 1811 { | |
| 1812 slot1 = htab_find_slot (opt_info->insns_to_split, ivts, INSERT); | |
|
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1813 gcc_assert (*slot1 == NULL); |
| 0 | 1814 *slot1 = ivts; |
|
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1815 *opt_info->iv_to_split_tail = ivts; |
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1816 opt_info->iv_to_split_tail = &ivts->next; |
| 0 | 1817 continue; |
| 1818 } | |
|
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1819 |
| 0 | 1820 if (opt_info->insns_with_var_to_expand) |
| 1821 ves = analyze_insn_to_expand_var (loop, insn); | |
|
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1822 |
| 0 | 1823 if (ves) |
| 1824 { | |
| 1825 slot2 = htab_find_slot (opt_info->insns_with_var_to_expand, ves, INSERT); | |
|
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1826 gcc_assert (*slot2 == NULL); |
| 0 | 1827 *slot2 = ves; |
|
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1828 *opt_info->var_to_expand_tail = ves; |
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1829 opt_info->var_to_expand_tail = &ves->next; |
| 0 | 1830 } |
| 1831 } | |
| 1832 } | |
|
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1833 |
| 0 | 1834 VEC_free (edge, heap, edges); |
| 1835 free (body); | |
| 1836 return opt_info; | |
| 1837 } | |
| 1838 | |
| 1839 /* Called just before loop duplication. Records start of duplicated area | |
| 1840 to OPT_INFO. */ | |
| 1841 | |
|
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1842 static void |
| 0 | 1843 opt_info_start_duplication (struct opt_info *opt_info) |
| 1844 { | |
| 1845 if (opt_info) | |
| 1846 opt_info->first_new_block = last_basic_block; | |
| 1847 } | |
| 1848 | |
| 1849 /* Determine the number of iterations between initialization of the base | |
| 1850 variable and the current copy (N_COPY). N_COPIES is the total number | |
| 1851 of newly created copies. UNROLLING is true if we are unrolling | |
| 1852 (not peeling) the loop. */ | |
| 1853 | |
| 1854 static unsigned | |
| 1855 determine_split_iv_delta (unsigned n_copy, unsigned n_copies, bool unrolling) | |
| 1856 { | |
| 1857 if (unrolling) | |
| 1858 { | |
| 1859 /* If we are unrolling, initialization is done in the original loop | |
| 1860 body (number 0). */ | |
| 1861 return n_copy; | |
| 1862 } | |
| 1863 else | |
| 1864 { | |
| 1865 /* If we are peeling, the copy in that the initialization occurs has | |
| 1866 number 1. The original loop (number 0) is the last. */ | |
| 1867 if (n_copy) | |
| 1868 return n_copy - 1; | |
| 1869 else | |
| 1870 return n_copies; | |
| 1871 } | |
| 1872 } | |
| 1873 | |
| 1874 /* Locate in EXPR the expression corresponding to the location recorded | |
| 1875 in IVTS, and return a pointer to the RTX for this location. */ | |
| 1876 | |
| 1877 static rtx * | |
| 1878 get_ivts_expr (rtx expr, struct iv_to_split *ivts) | |
| 1879 { | |
| 1880 unsigned i; | |
| 1881 rtx *ret = &expr; | |
| 1882 | |
| 1883 for (i = 0; i < ivts->n_loc; i++) | |
| 1884 ret = &XEXP (*ret, ivts->loc[i]); | |
| 1885 | |
| 1886 return ret; | |
| 1887 } | |
| 1888 | |
|
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1889 /* Allocate basic variable for the induction variable chain. */ |
| 0 | 1890 |
|
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1891 static void |
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1892 allocate_basic_variable (struct iv_to_split *ivts) |
| 0 | 1893 { |
| 1894 rtx expr = *get_ivts_expr (single_set (ivts->insn), ivts); | |
| 1895 | |
| 1896 ivts->base_var = gen_reg_rtx (GET_MODE (expr)); | |
| 1897 } | |
| 1898 | |
| 1899 /* Insert initialization of basic variable of IVTS before INSN, taking | |
| 1900 the initial value from INSN. */ | |
| 1901 | |
| 1902 static void | |
| 1903 insert_base_initialization (struct iv_to_split *ivts, rtx insn) | |
| 1904 { | |
| 1905 rtx expr = copy_rtx (*get_ivts_expr (single_set (insn), ivts)); | |
| 1906 rtx seq; | |
| 1907 | |
| 1908 start_sequence (); | |
| 1909 expr = force_operand (expr, ivts->base_var); | |
| 1910 if (expr != ivts->base_var) | |
| 1911 emit_move_insn (ivts->base_var, expr); | |
| 1912 seq = get_insns (); | |
| 1913 end_sequence (); | |
| 1914 | |
| 1915 emit_insn_before (seq, insn); | |
| 1916 } | |
| 1917 | |
| 1918 /* Replace the use of induction variable described in IVTS in INSN | |
| 1919 by base variable + DELTA * step. */ | |
| 1920 | |
| 1921 static void | |
| 1922 split_iv (struct iv_to_split *ivts, rtx insn, unsigned delta) | |
| 1923 { | |
| 1924 rtx expr, *loc, seq, incr, var; | |
| 1925 enum machine_mode mode = GET_MODE (ivts->base_var); | |
| 1926 rtx src, dest, set; | |
| 1927 | |
| 1928 /* Construct base + DELTA * step. */ | |
| 1929 if (!delta) | |
| 1930 expr = ivts->base_var; | |
| 1931 else | |
| 1932 { | |
| 1933 incr = simplify_gen_binary (MULT, mode, | |
| 1934 ivts->step, gen_int_mode (delta, mode)); | |
| 1935 expr = simplify_gen_binary (PLUS, GET_MODE (ivts->base_var), | |
| 1936 ivts->base_var, incr); | |
| 1937 } | |
| 1938 | |
| 1939 /* Figure out where to do the replacement. */ | |
| 1940 loc = get_ivts_expr (single_set (insn), ivts); | |
| 1941 | |
| 1942 /* If we can make the replacement right away, we're done. */ | |
| 1943 if (validate_change (insn, loc, expr, 0)) | |
| 1944 return; | |
| 1945 | |
| 1946 /* Otherwise, force EXPR into a register and try again. */ | |
| 1947 start_sequence (); | |
| 1948 var = gen_reg_rtx (mode); | |
| 1949 expr = force_operand (expr, var); | |
| 1950 if (expr != var) | |
| 1951 emit_move_insn (var, expr); | |
| 1952 seq = get_insns (); | |
| 1953 end_sequence (); | |
| 1954 emit_insn_before (seq, insn); | |
|
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1955 |
| 0 | 1956 if (validate_change (insn, loc, var, 0)) |
| 1957 return; | |
| 1958 | |
| 1959 /* The last chance. Try recreating the assignment in insn | |
| 1960 completely from scratch. */ | |
| 1961 set = single_set (insn); | |
| 1962 gcc_assert (set); | |
| 1963 | |
| 1964 start_sequence (); | |
| 1965 *loc = var; | |
| 1966 src = copy_rtx (SET_SRC (set)); | |
| 1967 dest = copy_rtx (SET_DEST (set)); | |
| 1968 src = force_operand (src, dest); | |
| 1969 if (src != dest) | |
| 1970 emit_move_insn (dest, src); | |
| 1971 seq = get_insns (); | |
| 1972 end_sequence (); | |
|
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1973 |
| 0 | 1974 emit_insn_before (seq, insn); |
| 1975 delete_insn (insn); | |
| 1976 } | |
| 1977 | |
| 1978 | |
| 1979 /* Return one expansion of the accumulator recorded in struct VE. */ | |
| 1980 | |
| 1981 static rtx | |
| 1982 get_expansion (struct var_to_expand *ve) | |
| 1983 { | |
| 1984 rtx reg; | |
|
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1985 |
| 0 | 1986 if (ve->reuse_expansion == 0) |
| 1987 reg = ve->reg; | |
| 1988 else | |
| 1989 reg = VEC_index (rtx, ve->var_expansions, ve->reuse_expansion - 1); | |
|
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1990 |
| 0 | 1991 if (VEC_length (rtx, ve->var_expansions) == (unsigned) ve->reuse_expansion) |
| 1992 ve->reuse_expansion = 0; | |
|
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1993 else |
| 0 | 1994 ve->reuse_expansion++; |
|
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1995 |
| 0 | 1996 return reg; |
| 1997 } | |
| 1998 | |
| 1999 | |
|
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2000 /* Given INSN replace the uses of the accumulator recorded in VE |
| 0 | 2001 with a new register. */ |
| 2002 | |
| 2003 static void | |
| 2004 expand_var_during_unrolling (struct var_to_expand *ve, rtx insn) | |
| 2005 { | |
| 2006 rtx new_reg, set; | |
| 2007 bool really_new_expansion = false; | |
|
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2008 |
| 0 | 2009 set = single_set (insn); |
| 2010 gcc_assert (set); | |
|
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2011 |
| 0 | 2012 /* Generate a new register only if the expansion limit has not been |
| 2013 reached. Else reuse an already existing expansion. */ | |
| 2014 if (PARAM_VALUE (PARAM_MAX_VARIABLE_EXPANSIONS) > ve->expansion_count) | |
| 2015 { | |
| 2016 really_new_expansion = true; | |
| 2017 new_reg = gen_reg_rtx (GET_MODE (ve->reg)); | |
| 2018 } | |
| 2019 else | |
| 2020 new_reg = get_expansion (ve); | |
| 2021 | |
| 2022 validate_change (insn, &SET_DEST (set), new_reg, 1); | |
| 2023 validate_change (insn, &XEXP (SET_SRC (set), ve->accum_pos), new_reg, 1); | |
|
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2024 |
| 0 | 2025 if (apply_change_group ()) |
| 2026 if (really_new_expansion) | |
| 2027 { | |
| 2028 VEC_safe_push (rtx, heap, ve->var_expansions, new_reg); | |
| 2029 ve->expansion_count++; | |
| 2030 } | |
| 2031 } | |
| 2032 | |
|
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2033 /* Initialize the variable expansions in loop preheader. PLACE is the |
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2034 loop-preheader basic block where the initialization of the |
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2035 expansions should take place. The expansions are initialized with |
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2036 (-0) when the operation is plus or minus to honor sign zero. This |
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2037 way we can prevent cases where the sign of the final result is |
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2038 effected by the sign of the expansion. Here is an example to |
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2039 demonstrate this: |
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2040 |
| 0 | 2041 for (i = 0 ; i < n; i++) |
| 2042 sum += something; | |
| 2043 | |
| 2044 ==> | |
| 2045 | |
| 2046 sum += something | |
| 2047 .... | |
| 2048 i = i+1; | |
| 2049 sum1 += something | |
| 2050 .... | |
| 2051 i = i+1 | |
| 2052 sum2 += something; | |
| 2053 .... | |
|
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2054 |
| 0 | 2055 When SUM is initialized with -zero and SOMETHING is also -zero; the |
| 2056 final result of sum should be -zero thus the expansions sum1 and sum2 | |
| 2057 should be initialized with -zero as well (otherwise we will get +zero | |
| 2058 as the final result). */ | |
| 2059 | |
|
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2060 static void |
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2061 insert_var_expansion_initialization (struct var_to_expand *ve, |
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2062 basic_block place) |
| 0 | 2063 { |
| 2064 rtx seq, var, zero_init, insn; | |
| 2065 unsigned i; | |
| 2066 enum machine_mode mode = GET_MODE (ve->reg); | |
| 2067 bool honor_signed_zero_p = HONOR_SIGNED_ZEROS (mode); | |
| 2068 | |
| 2069 if (VEC_length (rtx, ve->var_expansions) == 0) | |
|
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2070 return; |
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2071 |
| 0 | 2072 start_sequence (); |
|
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2073 if (ve->op == PLUS || ve->op == MINUS) |
| 0 | 2074 for (i = 0; VEC_iterate (rtx, ve->var_expansions, i, var); i++) |
| 2075 { | |
| 2076 if (honor_signed_zero_p) | |
| 2077 zero_init = simplify_gen_unary (NEG, mode, CONST0_RTX (mode), mode); | |
| 2078 else | |
| 2079 zero_init = CONST0_RTX (mode); | |
|
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2080 |
| 0 | 2081 emit_move_insn (var, zero_init); |
| 2082 } | |
| 2083 else if (ve->op == MULT) | |
| 2084 for (i = 0; VEC_iterate (rtx, ve->var_expansions, i, var); i++) | |
| 2085 { | |
| 2086 zero_init = CONST1_RTX (GET_MODE (var)); | |
| 2087 emit_move_insn (var, zero_init); | |
| 2088 } | |
|
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2089 |
| 0 | 2090 seq = get_insns (); |
| 2091 end_sequence (); | |
|
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2092 |
| 0 | 2093 insn = BB_HEAD (place); |
| 2094 while (!NOTE_INSN_BASIC_BLOCK_P (insn)) | |
| 2095 insn = NEXT_INSN (insn); | |
|
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2096 |
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2097 emit_insn_after (seq, insn); |
| 0 | 2098 } |
| 2099 | |
|
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2100 /* Combine the variable expansions at the loop exit. PLACE is the |
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2101 loop exit basic block where the summation of the expansions should |
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2102 take place. */ |
| 0 | 2103 |
|
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2104 static void |
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2105 combine_var_copies_in_loop_exit (struct var_to_expand *ve, basic_block place) |
| 0 | 2106 { |
| 2107 rtx sum = ve->reg; | |
| 2108 rtx expr, seq, var, insn; | |
| 2109 unsigned i; | |
| 2110 | |
| 2111 if (VEC_length (rtx, ve->var_expansions) == 0) | |
|
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2112 return; |
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2113 |
| 0 | 2114 start_sequence (); |
| 2115 if (ve->op == PLUS || ve->op == MINUS) | |
| 2116 for (i = 0; VEC_iterate (rtx, ve->var_expansions, i, var); i++) | |
| 2117 { | |
| 2118 sum = simplify_gen_binary (PLUS, GET_MODE (ve->reg), | |
| 2119 var, sum); | |
| 2120 } | |
| 2121 else if (ve->op == MULT) | |
| 2122 for (i = 0; VEC_iterate (rtx, ve->var_expansions, i, var); i++) | |
| 2123 { | |
| 2124 sum = simplify_gen_binary (MULT, GET_MODE (ve->reg), | |
| 2125 var, sum); | |
| 2126 } | |
|
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2127 |
| 0 | 2128 expr = force_operand (sum, ve->reg); |
| 2129 if (expr != ve->reg) | |
| 2130 emit_move_insn (ve->reg, expr); | |
| 2131 seq = get_insns (); | |
| 2132 end_sequence (); | |
|
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2133 |
| 0 | 2134 insn = BB_HEAD (place); |
| 2135 while (!NOTE_INSN_BASIC_BLOCK_P (insn)) | |
| 2136 insn = NEXT_INSN (insn); | |
| 2137 | |
| 2138 emit_insn_after (seq, insn); | |
| 2139 } | |
| 2140 | |
|
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2141 /* Apply loop optimizations in loop copies using the |
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2142 data which gathered during the unrolling. Structure |
| 0 | 2143 OPT_INFO record that data. |
|
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2144 |
| 0 | 2145 UNROLLING is true if we unrolled (not peeled) the loop. |
| 2146 REWRITE_ORIGINAL_BODY is true if we should also rewrite the original body of | |
| 2147 the loop (as it should happen in complete unrolling, but not in ordinary | |
| 2148 peeling of the loop). */ | |
| 2149 | |
| 2150 static void | |
|
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2151 apply_opt_in_copies (struct opt_info *opt_info, |
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2152 unsigned n_copies, bool unrolling, |
| 0 | 2153 bool rewrite_original_loop) |
| 2154 { | |
| 2155 unsigned i, delta; | |
| 2156 basic_block bb, orig_bb; | |
| 2157 rtx insn, orig_insn, next; | |
| 2158 struct iv_to_split ivts_templ, *ivts; | |
| 2159 struct var_to_expand ve_templ, *ves; | |
|
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2160 |
| 0 | 2161 /* Sanity check -- we need to put initialization in the original loop |
| 2162 body. */ | |
| 2163 gcc_assert (!unrolling || rewrite_original_loop); | |
|
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2164 |
| 0 | 2165 /* Allocate the basic variables (i0). */ |
| 2166 if (opt_info->insns_to_split) | |
|
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2167 for (ivts = opt_info->iv_to_split_head; ivts; ivts = ivts->next) |
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2168 allocate_basic_variable (ivts); |
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2169 |
| 0 | 2170 for (i = opt_info->first_new_block; i < (unsigned) last_basic_block; i++) |
| 2171 { | |
| 2172 bb = BASIC_BLOCK (i); | |
| 2173 orig_bb = get_bb_original (bb); | |
|
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2174 |
| 0 | 2175 /* bb->aux holds position in copy sequence initialized by |
| 2176 duplicate_loop_to_header_edge. */ | |
| 2177 delta = determine_split_iv_delta ((size_t)bb->aux, n_copies, | |
| 2178 unrolling); | |
| 2179 bb->aux = 0; | |
| 2180 orig_insn = BB_HEAD (orig_bb); | |
| 2181 for (insn = BB_HEAD (bb); insn != NEXT_INSN (BB_END (bb)); insn = next) | |
| 2182 { | |
| 2183 next = NEXT_INSN (insn); | |
| 2184 if (!INSN_P (insn)) | |
| 2185 continue; | |
|
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2186 |
| 0 | 2187 while (!INSN_P (orig_insn)) |
| 2188 orig_insn = NEXT_INSN (orig_insn); | |
|
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2189 |
| 0 | 2190 ivts_templ.insn = orig_insn; |
| 2191 ve_templ.insn = orig_insn; | |
|
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2192 |
| 0 | 2193 /* Apply splitting iv optimization. */ |
| 2194 if (opt_info->insns_to_split) | |
| 2195 { | |
| 2196 ivts = (struct iv_to_split *) | |
| 2197 htab_find (opt_info->insns_to_split, &ivts_templ); | |
|
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2198 |
| 0 | 2199 if (ivts) |
| 2200 { | |
| 2201 gcc_assert (GET_CODE (PATTERN (insn)) | |
| 2202 == GET_CODE (PATTERN (orig_insn))); | |
|
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2203 |
| 0 | 2204 if (!delta) |
| 2205 insert_base_initialization (ivts, insn); | |
| 2206 split_iv (ivts, insn, delta); | |
| 2207 } | |
| 2208 } | |
| 2209 /* Apply variable expansion optimization. */ | |
| 2210 if (unrolling && opt_info->insns_with_var_to_expand) | |
| 2211 { | |
| 2212 ves = (struct var_to_expand *) | |
| 2213 htab_find (opt_info->insns_with_var_to_expand, &ve_templ); | |
| 2214 if (ves) | |
|
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2215 { |
| 0 | 2216 gcc_assert (GET_CODE (PATTERN (insn)) |
| 2217 == GET_CODE (PATTERN (orig_insn))); | |
| 2218 expand_var_during_unrolling (ves, insn); | |
| 2219 } | |
| 2220 } | |
| 2221 orig_insn = NEXT_INSN (orig_insn); | |
| 2222 } | |
| 2223 } | |
| 2224 | |
| 2225 if (!rewrite_original_loop) | |
| 2226 return; | |
|
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2227 |
| 0 | 2228 /* Initialize the variable expansions in the loop preheader |
|
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2229 and take care of combining them at the loop exit. */ |
| 0 | 2230 if (opt_info->insns_with_var_to_expand) |
| 2231 { | |
|
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2232 for (ves = opt_info->var_to_expand_head; ves; ves = ves->next) |
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2233 insert_var_expansion_initialization (ves, opt_info->loop_preheader); |
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2234 for (ves = opt_info->var_to_expand_head; ves; ves = ves->next) |
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2235 combine_var_copies_in_loop_exit (ves, opt_info->loop_exit); |
| 0 | 2236 } |
|
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2237 |
| 0 | 2238 /* Rewrite also the original loop body. Find them as originals of the blocks |
| 2239 in the last copied iteration, i.e. those that have | |
| 2240 get_bb_copy (get_bb_original (bb)) == bb. */ | |
| 2241 for (i = opt_info->first_new_block; i < (unsigned) last_basic_block; i++) | |
| 2242 { | |
| 2243 bb = BASIC_BLOCK (i); | |
| 2244 orig_bb = get_bb_original (bb); | |
| 2245 if (get_bb_copy (orig_bb) != bb) | |
| 2246 continue; | |
|
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2247 |
| 0 | 2248 delta = determine_split_iv_delta (0, n_copies, unrolling); |
| 2249 for (orig_insn = BB_HEAD (orig_bb); | |
| 2250 orig_insn != NEXT_INSN (BB_END (bb)); | |
| 2251 orig_insn = next) | |
| 2252 { | |
| 2253 next = NEXT_INSN (orig_insn); | |
|
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2254 |
| 0 | 2255 if (!INSN_P (orig_insn)) |
| 2256 continue; | |
|
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2257 |
| 0 | 2258 ivts_templ.insn = orig_insn; |
| 2259 if (opt_info->insns_to_split) | |
| 2260 { | |
| 2261 ivts = (struct iv_to_split *) | |
| 2262 htab_find (opt_info->insns_to_split, &ivts_templ); | |
| 2263 if (ivts) | |
| 2264 { | |
| 2265 if (!delta) | |
| 2266 insert_base_initialization (ivts, orig_insn); | |
| 2267 split_iv (ivts, orig_insn, delta); | |
| 2268 continue; | |
| 2269 } | |
| 2270 } | |
|
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2271 |
| 0 | 2272 } |
| 2273 } | |
| 2274 } | |
| 2275 | |
| 2276 /* Release OPT_INFO. */ | |
| 2277 | |
| 2278 static void | |
| 2279 free_opt_info (struct opt_info *opt_info) | |
| 2280 { | |
| 2281 if (opt_info->insns_to_split) | |
| 2282 htab_delete (opt_info->insns_to_split); | |
| 2283 if (opt_info->insns_with_var_to_expand) | |
| 2284 { | |
|
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2285 struct var_to_expand *ves; |
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2286 |
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2287 for (ves = opt_info->var_to_expand_head; ves; ves = ves->next) |
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2288 VEC_free (rtx, heap, ves->var_expansions); |
| 0 | 2289 htab_delete (opt_info->insns_with_var_to_expand); |
| 2290 } | |
| 2291 free (opt_info); | |
| 2292 } |