Mercurial > hg > CbC > CbC_gcc
annotate gcc/cfgcleanup.c @ 131:84e7813d76e9
gcc-8.2
| author | mir3636 |
|---|---|
| date | Thu, 25 Oct 2018 07:37:49 +0900 |
| parents | 04ced10e8804 |
| children | 1830386684a0 |
| rev | line source |
|---|---|
| 0 | 1 /* Control flow optimization code for GNU compiler. |
| 131 | 2 Copyright (C) 1987-2018 Free Software Foundation, Inc. |
| 0 | 3 |
| 4 This file is part of GCC. | |
| 5 | |
| 6 GCC is free software; you can redistribute it and/or modify it under | |
| 7 the terms of the GNU General Public License as published by the Free | |
| 8 Software Foundation; either version 3, or (at your option) any later | |
| 9 version. | |
| 10 | |
| 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 /* This file contains optimizer of the control flow. The main entry point is | |
| 21 cleanup_cfg. Following optimizations are performed: | |
| 22 | |
| 23 - Unreachable blocks removal | |
| 24 - Edge forwarding (edge to the forwarder block is forwarded to its | |
| 25 successor. Simplification of the branch instruction is performed by | |
| 26 underlying infrastructure so branch can be converted to simplejump or | |
| 27 eliminated). | |
| 28 - Cross jumping (tail merging) | |
| 29 - Conditional jump-around-simplejump simplification | |
| 30 - Basic block merging. */ | |
| 31 | |
| 32 #include "config.h" | |
| 33 #include "system.h" | |
| 34 #include "coretypes.h" | |
| 111 | 35 #include "backend.h" |
| 36 #include "target.h" | |
| 0 | 37 #include "rtl.h" |
| 111 | 38 #include "tree.h" |
| 39 #include "cfghooks.h" | |
| 40 #include "df.h" | |
| 41 #include "memmodel.h" | |
| 42 #include "tm_p.h" | |
| 0 | 43 #include "insn-config.h" |
| 111 | 44 #include "emit-rtl.h" |
| 0 | 45 #include "cselib.h" |
| 46 #include "params.h" | |
| 47 #include "tree-pass.h" | |
| 48 #include "cfgloop.h" | |
| 111 | 49 #include "cfgrtl.h" |
| 50 #include "cfganal.h" | |
| 51 #include "cfgbuild.h" | |
| 52 #include "cfgcleanup.h" | |
| 0 | 53 #include "dce.h" |
| 54 #include "dbgcnt.h" | |
| 111 | 55 #include "rtl-iter.h" |
| 0 | 56 |
| 57 #define FORWARDER_BLOCK_P(BB) ((BB)->flags & BB_FORWARDER_BLOCK) | |
| 58 | |
| 59 /* Set to true when we are running first pass of try_optimize_cfg loop. */ | |
| 60 static bool first_pass; | |
| 61 | |
| 111 | 62 /* Set to true if crossjumps occurred in the latest run of try_optimize_cfg. */ |
| 63 static bool crossjumps_occurred; | |
| 0 | 64 |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
65 /* Set to true if we couldn't run an optimization due to stale liveness |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
66 information; we should run df_analyze to enable more opportunities. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
67 static bool block_was_dirty; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
68 |
| 111 | 69 static bool try_crossjump_to_edge (int, edge, edge, enum replace_direction); |
| 0 | 70 static bool try_crossjump_bb (int, basic_block); |
| 71 static bool outgoing_edges_match (int, basic_block, basic_block); | |
| 111 | 72 static enum replace_direction old_insns_match_p (int, rtx_insn *, rtx_insn *); |
| 0 | 73 |
| 74 static void merge_blocks_move_predecessor_nojumps (basic_block, basic_block); | |
| 75 static void merge_blocks_move_successor_nojumps (basic_block, basic_block); | |
| 76 static bool try_optimize_cfg (int); | |
| 77 static bool try_simplify_condjump (basic_block); | |
| 78 static bool try_forward_edges (int, basic_block); | |
| 79 static edge thread_jump (edge, basic_block); | |
| 80 static bool mark_effect (rtx, bitmap); | |
| 81 static void notice_new_block (basic_block); | |
| 82 static void update_forwarder_flag (basic_block); | |
| 83 static void merge_memattrs (rtx, rtx); | |
| 84 | |
| 85 /* Set flags for newly created block. */ | |
| 86 | |
| 87 static void | |
| 88 notice_new_block (basic_block bb) | |
| 89 { | |
| 90 if (!bb) | |
| 91 return; | |
| 92 | |
| 93 if (forwarder_block_p (bb)) | |
| 94 bb->flags |= BB_FORWARDER_BLOCK; | |
| 95 } | |
| 96 | |
| 97 /* Recompute forwarder flag after block has been modified. */ | |
| 98 | |
| 99 static void | |
| 100 update_forwarder_flag (basic_block bb) | |
| 101 { | |
| 102 if (forwarder_block_p (bb)) | |
| 103 bb->flags |= BB_FORWARDER_BLOCK; | |
| 104 else | |
| 105 bb->flags &= ~BB_FORWARDER_BLOCK; | |
| 106 } | |
| 107 | |
| 108 /* Simplify a conditional jump around an unconditional jump. | |
| 109 Return true if something changed. */ | |
| 110 | |
| 111 static bool | |
| 112 try_simplify_condjump (basic_block cbranch_block) | |
| 113 { | |
| 114 basic_block jump_block, jump_dest_block, cbranch_dest_block; | |
| 115 edge cbranch_jump_edge, cbranch_fallthru_edge; | |
| 111 | 116 rtx_insn *cbranch_insn; |
| 0 | 117 |
| 118 /* Verify that there are exactly two successors. */ | |
| 119 if (EDGE_COUNT (cbranch_block->succs) != 2) | |
| 120 return false; | |
| 121 | |
| 122 /* Verify that we've got a normal conditional branch at the end | |
| 123 of the block. */ | |
| 124 cbranch_insn = BB_END (cbranch_block); | |
| 125 if (!any_condjump_p (cbranch_insn)) | |
| 126 return false; | |
| 127 | |
| 128 cbranch_fallthru_edge = FALLTHRU_EDGE (cbranch_block); | |
| 129 cbranch_jump_edge = BRANCH_EDGE (cbranch_block); | |
| 130 | |
| 131 /* The next block must not have multiple predecessors, must not | |
| 132 be the last block in the function, and must contain just the | |
| 133 unconditional jump. */ | |
| 134 jump_block = cbranch_fallthru_edge->dest; | |
| 135 if (!single_pred_p (jump_block) | |
| 111 | 136 || jump_block->next_bb == EXIT_BLOCK_PTR_FOR_FN (cfun) |
| 0 | 137 || !FORWARDER_BLOCK_P (jump_block)) |
| 138 return false; | |
| 139 jump_dest_block = single_succ (jump_block); | |
| 140 | |
| 141 /* If we are partitioning hot/cold basic blocks, we don't want to | |
| 142 mess up unconditional or indirect jumps that cross between hot | |
| 143 and cold sections. | |
| 144 | |
| 145 Basic block partitioning may result in some jumps that appear to | |
| 146 be optimizable (or blocks that appear to be mergeable), but which really | |
| 147 must be left untouched (they are required to make it safely across | |
| 148 partition boundaries). See the comments at the top of | |
| 149 bb-reorder.c:partition_hot_cold_basic_blocks for complete details. */ | |
| 150 | |
| 151 if (BB_PARTITION (jump_block) != BB_PARTITION (jump_dest_block) | |
| 152 || (cbranch_jump_edge->flags & EDGE_CROSSING)) | |
| 153 return false; | |
| 154 | |
| 155 /* The conditional branch must target the block after the | |
| 156 unconditional branch. */ | |
| 157 cbranch_dest_block = cbranch_jump_edge->dest; | |
| 158 | |
| 111 | 159 if (cbranch_dest_block == EXIT_BLOCK_PTR_FOR_FN (cfun) |
| 160 || jump_dest_block == EXIT_BLOCK_PTR_FOR_FN (cfun) | |
| 0 | 161 || !can_fallthru (jump_block, cbranch_dest_block)) |
| 162 return false; | |
| 163 | |
| 164 /* Invert the conditional branch. */ | |
| 111 | 165 if (!invert_jump (as_a <rtx_jump_insn *> (cbranch_insn), |
| 166 block_label (jump_dest_block), 0)) | |
| 0 | 167 return false; |
| 168 | |
| 169 if (dump_file) | |
| 170 fprintf (dump_file, "Simplifying condjump %i around jump %i\n", | |
| 171 INSN_UID (cbranch_insn), INSN_UID (BB_END (jump_block))); | |
| 172 | |
| 173 /* Success. Update the CFG to match. Note that after this point | |
| 174 the edge variable names appear backwards; the redirection is done | |
| 175 this way to preserve edge profile data. */ | |
| 176 cbranch_jump_edge = redirect_edge_succ_nodup (cbranch_jump_edge, | |
| 177 cbranch_dest_block); | |
| 178 cbranch_fallthru_edge = redirect_edge_succ_nodup (cbranch_fallthru_edge, | |
| 179 jump_dest_block); | |
| 180 cbranch_jump_edge->flags |= EDGE_FALLTHRU; | |
| 181 cbranch_fallthru_edge->flags &= ~EDGE_FALLTHRU; | |
| 182 update_br_prob_note (cbranch_block); | |
| 183 | |
| 184 /* Delete the block with the unconditional jump, and clean up the mess. */ | |
| 185 delete_basic_block (jump_block); | |
| 186 tidy_fallthru_edge (cbranch_jump_edge); | |
| 187 update_forwarder_flag (cbranch_block); | |
| 188 | |
| 189 return true; | |
| 190 } | |
| 191 | |
| 192 /* Attempt to prove that operation is NOOP using CSElib or mark the effect | |
| 193 on register. Used by jump threading. */ | |
| 194 | |
| 195 static bool | |
| 196 mark_effect (rtx exp, regset nonequal) | |
| 197 { | |
| 198 rtx dest; | |
| 199 switch (GET_CODE (exp)) | |
| 200 { | |
| 201 /* In case we do clobber the register, mark it as equal, as we know the | |
| 202 value is dead so it don't have to match. */ | |
| 203 case CLOBBER: | |
| 111 | 204 dest = XEXP (exp, 0); |
| 205 if (REG_P (dest)) | |
| 206 bitmap_clear_range (nonequal, REGNO (dest), REG_NREGS (dest)); | |
| 0 | 207 return false; |
| 208 | |
| 209 case SET: | |
| 210 if (rtx_equal_for_cselib_p (SET_DEST (exp), SET_SRC (exp))) | |
| 211 return false; | |
| 212 dest = SET_DEST (exp); | |
| 213 if (dest == pc_rtx) | |
| 214 return false; | |
| 215 if (!REG_P (dest)) | |
| 216 return true; | |
| 111 | 217 bitmap_set_range (nonequal, REGNO (dest), REG_NREGS (dest)); |
| 0 | 218 return false; |
| 219 | |
| 220 default: | |
| 221 return false; | |
| 222 } | |
| 223 } | |
| 224 | |
| 111 | 225 /* Return true if X contains a register in NONEQUAL. */ |
| 226 static bool | |
| 227 mentions_nonequal_regs (const_rtx x, regset nonequal) | |
| 0 | 228 { |
| 111 | 229 subrtx_iterator::array_type array; |
| 230 FOR_EACH_SUBRTX (iter, array, x, NONCONST) | |
| 0 | 231 { |
| 111 | 232 const_rtx x = *iter; |
| 233 if (REG_P (x)) | |
| 0 | 234 { |
| 111 | 235 unsigned int end_regno = END_REGNO (x); |
| 236 for (unsigned int regno = REGNO (x); regno < end_regno; ++regno) | |
| 237 if (REGNO_REG_SET_P (nonequal, regno)) | |
| 238 return true; | |
| 0 | 239 } |
| 240 } | |
| 111 | 241 return false; |
| 0 | 242 } |
| 111 | 243 |
| 0 | 244 /* Attempt to prove that the basic block B will have no side effects and |
| 245 always continues in the same edge if reached via E. Return the edge | |
| 246 if exist, NULL otherwise. */ | |
| 247 | |
| 248 static edge | |
| 249 thread_jump (edge e, basic_block b) | |
| 250 { | |
| 111 | 251 rtx set1, set2, cond1, cond2; |
| 252 rtx_insn *insn; | |
| 0 | 253 enum rtx_code code1, code2, reversed_code2; |
| 254 bool reverse1 = false; | |
| 255 unsigned i; | |
| 256 regset nonequal; | |
| 257 bool failed = false; | |
| 258 reg_set_iterator rsi; | |
| 259 | |
| 260 if (b->flags & BB_NONTHREADABLE_BLOCK) | |
| 261 return NULL; | |
| 262 | |
| 263 /* At the moment, we do handle only conditional jumps, but later we may | |
| 264 want to extend this code to tablejumps and others. */ | |
| 265 if (EDGE_COUNT (e->src->succs) != 2) | |
| 266 return NULL; | |
| 267 if (EDGE_COUNT (b->succs) != 2) | |
| 268 { | |
| 269 b->flags |= BB_NONTHREADABLE_BLOCK; | |
| 270 return NULL; | |
| 271 } | |
| 272 | |
| 273 /* Second branch must end with onlyjump, as we will eliminate the jump. */ | |
| 274 if (!any_condjump_p (BB_END (e->src))) | |
| 275 return NULL; | |
| 276 | |
| 277 if (!any_condjump_p (BB_END (b)) || !onlyjump_p (BB_END (b))) | |
| 278 { | |
| 279 b->flags |= BB_NONTHREADABLE_BLOCK; | |
| 280 return NULL; | |
| 281 } | |
| 282 | |
| 283 set1 = pc_set (BB_END (e->src)); | |
| 284 set2 = pc_set (BB_END (b)); | |
| 285 if (((e->flags & EDGE_FALLTHRU) != 0) | |
| 286 != (XEXP (SET_SRC (set1), 1) == pc_rtx)) | |
| 287 reverse1 = true; | |
| 288 | |
| 289 cond1 = XEXP (SET_SRC (set1), 0); | |
| 290 cond2 = XEXP (SET_SRC (set2), 0); | |
| 291 if (reverse1) | |
| 292 code1 = reversed_comparison_code (cond1, BB_END (e->src)); | |
| 293 else | |
| 294 code1 = GET_CODE (cond1); | |
| 295 | |
| 296 code2 = GET_CODE (cond2); | |
| 297 reversed_code2 = reversed_comparison_code (cond2, BB_END (b)); | |
| 298 | |
| 299 if (!comparison_dominates_p (code1, code2) | |
| 300 && !comparison_dominates_p (code1, reversed_code2)) | |
| 301 return NULL; | |
| 302 | |
| 303 /* Ensure that the comparison operators are equivalent. | |
| 304 ??? This is far too pessimistic. We should allow swapped operands, | |
| 305 different CCmodes, or for example comparisons for interval, that | |
| 306 dominate even when operands are not equivalent. */ | |
| 307 if (!rtx_equal_p (XEXP (cond1, 0), XEXP (cond2, 0)) | |
| 308 || !rtx_equal_p (XEXP (cond1, 1), XEXP (cond2, 1))) | |
| 309 return NULL; | |
| 310 | |
| 311 /* Short circuit cases where block B contains some side effects, as we can't | |
| 312 safely bypass it. */ | |
| 313 for (insn = NEXT_INSN (BB_HEAD (b)); insn != NEXT_INSN (BB_END (b)); | |
| 314 insn = NEXT_INSN (insn)) | |
| 315 if (INSN_P (insn) && side_effects_p (PATTERN (insn))) | |
| 316 { | |
| 317 b->flags |= BB_NONTHREADABLE_BLOCK; | |
| 318 return NULL; | |
| 319 } | |
| 320 | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
321 cselib_init (0); |
| 0 | 322 |
| 323 /* First process all values computed in the source basic block. */ | |
| 324 for (insn = NEXT_INSN (BB_HEAD (e->src)); | |
| 325 insn != NEXT_INSN (BB_END (e->src)); | |
| 326 insn = NEXT_INSN (insn)) | |
| 327 if (INSN_P (insn)) | |
| 328 cselib_process_insn (insn); | |
| 329 | |
| 330 nonequal = BITMAP_ALLOC (NULL); | |
| 331 CLEAR_REG_SET (nonequal); | |
| 332 | |
| 333 /* Now assume that we've continued by the edge E to B and continue | |
| 334 processing as if it were same basic block. | |
| 335 Our goal is to prove that whole block is an NOOP. */ | |
| 336 | |
| 337 for (insn = NEXT_INSN (BB_HEAD (b)); | |
| 338 insn != NEXT_INSN (BB_END (b)) && !failed; | |
| 339 insn = NEXT_INSN (insn)) | |
| 340 { | |
| 341 if (INSN_P (insn)) | |
| 342 { | |
| 343 rtx pat = PATTERN (insn); | |
| 344 | |
| 345 if (GET_CODE (pat) == PARALLEL) | |
| 346 { | |
| 347 for (i = 0; i < (unsigned)XVECLEN (pat, 0); i++) | |
| 348 failed |= mark_effect (XVECEXP (pat, 0, i), nonequal); | |
| 349 } | |
| 350 else | |
| 351 failed |= mark_effect (pat, nonequal); | |
| 352 } | |
| 353 | |
| 354 cselib_process_insn (insn); | |
| 355 } | |
| 356 | |
| 357 /* Later we should clear nonequal of dead registers. So far we don't | |
| 358 have life information in cfg_cleanup. */ | |
| 359 if (failed) | |
| 360 { | |
| 361 b->flags |= BB_NONTHREADABLE_BLOCK; | |
| 362 goto failed_exit; | |
| 363 } | |
| 364 | |
| 365 /* cond2 must not mention any register that is not equal to the | |
| 366 former block. */ | |
| 111 | 367 if (mentions_nonequal_regs (cond2, nonequal)) |
| 0 | 368 goto failed_exit; |
| 369 | |
| 370 EXECUTE_IF_SET_IN_REG_SET (nonequal, 0, i, rsi) | |
| 371 goto failed_exit; | |
| 372 | |
| 373 BITMAP_FREE (nonequal); | |
| 374 cselib_finish (); | |
| 375 if ((comparison_dominates_p (code1, code2) != 0) | |
| 376 != (XEXP (SET_SRC (set2), 1) == pc_rtx)) | |
| 377 return BRANCH_EDGE (b); | |
| 378 else | |
| 379 return FALLTHRU_EDGE (b); | |
| 380 | |
| 381 failed_exit: | |
| 382 BITMAP_FREE (nonequal); | |
| 383 cselib_finish (); | |
| 384 return NULL; | |
| 385 } | |
| 386 | |
| 387 /* Attempt to forward edges leaving basic block B. | |
| 388 Return true if successful. */ | |
| 389 | |
| 390 static bool | |
| 391 try_forward_edges (int mode, basic_block b) | |
| 392 { | |
| 393 bool changed = false; | |
| 394 edge_iterator ei; | |
| 395 edge e, *threaded_edges = NULL; | |
| 396 | |
| 397 for (ei = ei_start (b->succs); (e = ei_safe_edge (ei)); ) | |
| 398 { | |
| 399 basic_block target, first; | |
| 111 | 400 location_t goto_locus; |
| 401 int counter; | |
| 0 | 402 bool threaded = false; |
| 403 int nthreaded_edges = 0; | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
404 bool may_thread = first_pass || (b->flags & BB_MODIFIED) != 0; |
| 131 | 405 bool new_target_threaded = false; |
| 0 | 406 |
| 407 /* Skip complex edges because we don't know how to update them. | |
| 408 | |
| 409 Still handle fallthru edges, as we can succeed to forward fallthru | |
| 410 edge to the same place as the branch edge of conditional branch | |
| 411 and turn conditional branch to an unconditional branch. */ | |
| 412 if (e->flags & EDGE_COMPLEX) | |
| 413 { | |
| 414 ei_next (&ei); | |
| 415 continue; | |
| 416 } | |
| 417 | |
| 418 target = first = e->dest; | |
| 419 counter = NUM_FIXED_BLOCKS; | |
| 420 goto_locus = e->goto_locus; | |
| 421 | |
| 111 | 422 while (counter < n_basic_blocks_for_fn (cfun)) |
| 0 | 423 { |
| 424 basic_block new_target = NULL; | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
425 may_thread |= (target->flags & BB_MODIFIED) != 0; |
| 0 | 426 |
| 427 if (FORWARDER_BLOCK_P (target) | |
| 111 | 428 && single_succ (target) != EXIT_BLOCK_PTR_FOR_FN (cfun)) |
| 0 | 429 { |
| 430 /* Bypass trivial infinite loops. */ | |
| 431 new_target = single_succ (target); | |
| 432 if (target == new_target) | |
| 111 | 433 counter = n_basic_blocks_for_fn (cfun); |
| 0 | 434 else if (!optimize) |
| 435 { | |
| 436 /* When not optimizing, ensure that edges or forwarder | |
| 437 blocks with different locus are not optimized out. */ | |
| 111 | 438 location_t new_locus = single_succ_edge (target)->goto_locus; |
| 439 location_t locus = goto_locus; | |
| 440 | |
| 441 if (LOCATION_LOCUS (new_locus) != UNKNOWN_LOCATION | |
| 442 && LOCATION_LOCUS (locus) != UNKNOWN_LOCATION | |
| 443 && new_locus != locus) | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
444 new_target = NULL; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
445 else |
| 0 | 446 { |
| 111 | 447 if (LOCATION_LOCUS (new_locus) != UNKNOWN_LOCATION) |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
448 locus = new_locus; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
449 |
| 111 | 450 rtx_insn *last = BB_END (target); |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
451 if (DEBUG_INSN_P (last)) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
452 last = prev_nondebug_insn (last); |
| 111 | 453 if (last && INSN_P (last)) |
| 454 new_locus = INSN_LOCATION (last); | |
| 455 else | |
| 456 new_locus = UNKNOWN_LOCATION; | |
| 457 | |
| 458 if (LOCATION_LOCUS (new_locus) != UNKNOWN_LOCATION | |
| 459 && LOCATION_LOCUS (locus) != UNKNOWN_LOCATION | |
| 460 && new_locus != locus) | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
461 new_target = NULL; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
462 else |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
463 { |
| 111 | 464 if (LOCATION_LOCUS (new_locus) != UNKNOWN_LOCATION) |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
465 locus = new_locus; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
466 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
467 goto_locus = locus; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
468 } |
| 0 | 469 } |
| 470 } | |
| 471 } | |
| 472 | |
| 473 /* Allow to thread only over one edge at time to simplify updating | |
| 474 of probabilities. */ | |
| 475 else if ((mode & CLEANUP_THREADING) && may_thread) | |
| 476 { | |
| 477 edge t = thread_jump (e, target); | |
| 478 if (t) | |
| 479 { | |
| 480 if (!threaded_edges) | |
| 111 | 481 threaded_edges = XNEWVEC (edge, |
| 482 n_basic_blocks_for_fn (cfun)); | |
| 0 | 483 else |
| 484 { | |
| 485 int i; | |
| 486 | |
| 487 /* Detect an infinite loop across blocks not | |
| 488 including the start block. */ | |
| 489 for (i = 0; i < nthreaded_edges; ++i) | |
| 490 if (threaded_edges[i] == t) | |
| 491 break; | |
| 492 if (i < nthreaded_edges) | |
| 493 { | |
| 111 | 494 counter = n_basic_blocks_for_fn (cfun); |
| 0 | 495 break; |
| 496 } | |
| 497 } | |
| 498 | |
| 499 /* Detect an infinite loop across the start block. */ | |
| 500 if (t->dest == b) | |
| 501 break; | |
| 502 | |
| 111 | 503 gcc_assert (nthreaded_edges |
| 504 < (n_basic_blocks_for_fn (cfun) | |
| 505 - NUM_FIXED_BLOCKS)); | |
| 0 | 506 threaded_edges[nthreaded_edges++] = t; |
| 507 | |
| 508 new_target = t->dest; | |
| 509 new_target_threaded = true; | |
| 510 } | |
| 511 } | |
| 512 | |
| 513 if (!new_target) | |
| 514 break; | |
| 515 | |
| 516 counter++; | |
| 131 | 517 /* Do not turn non-crossing jump to crossing. Depending on target |
| 518 it may require different instruction pattern. */ | |
| 519 if ((e->flags & EDGE_CROSSING) | |
| 520 || BB_PARTITION (first) == BB_PARTITION (new_target)) | |
| 521 { | |
| 522 target = new_target; | |
| 523 threaded |= new_target_threaded; | |
| 524 } | |
| 0 | 525 } |
| 526 | |
| 111 | 527 if (counter >= n_basic_blocks_for_fn (cfun)) |
| 0 | 528 { |
| 529 if (dump_file) | |
| 530 fprintf (dump_file, "Infinite loop in BB %i.\n", | |
| 531 target->index); | |
| 532 } | |
| 533 else if (target == first) | |
| 534 ; /* We didn't do anything. */ | |
| 535 else | |
| 536 { | |
| 537 /* Save the values now, as the edge may get removed. */ | |
| 111 | 538 profile_count edge_count = e->count (); |
| 0 | 539 int n = 0; |
| 540 | |
| 541 e->goto_locus = goto_locus; | |
| 542 | |
| 543 /* Don't force if target is exit block. */ | |
| 111 | 544 if (threaded && target != EXIT_BLOCK_PTR_FOR_FN (cfun)) |
| 0 | 545 { |
| 546 notice_new_block (redirect_edge_and_branch_force (e, target)); | |
| 547 if (dump_file) | |
| 548 fprintf (dump_file, "Conditionals threaded.\n"); | |
| 549 } | |
| 550 else if (!redirect_edge_and_branch (e, target)) | |
| 551 { | |
| 552 if (dump_file) | |
| 553 fprintf (dump_file, | |
| 554 "Forwarding edge %i->%i to %i failed.\n", | |
| 555 b->index, e->dest->index, target->index); | |
| 556 ei_next (&ei); | |
| 557 continue; | |
| 558 } | |
| 559 | |
| 560 /* We successfully forwarded the edge. Now update profile | |
| 561 data: for each edge we traversed in the chain, remove | |
| 562 the original edge's execution count. */ | |
| 563 do | |
| 564 { | |
| 565 edge t; | |
| 566 | |
| 567 if (!single_succ_p (first)) | |
| 568 { | |
| 569 gcc_assert (n < nthreaded_edges); | |
| 570 t = threaded_edges [n++]; | |
| 571 gcc_assert (t->src == first); | |
| 131 | 572 update_bb_profile_for_threading (first, edge_count, t); |
| 0 | 573 update_br_prob_note (first); |
| 574 } | |
| 575 else | |
| 576 { | |
| 577 first->count -= edge_count; | |
| 578 /* It is possible that as the result of | |
| 579 threading we've removed edge as it is | |
| 580 threaded to the fallthru edge. Avoid | |
| 581 getting out of sync. */ | |
| 582 if (n < nthreaded_edges | |
| 583 && first == threaded_edges [n]->src) | |
| 584 n++; | |
| 585 t = single_succ_edge (first); | |
| 586 } | |
| 587 | |
| 588 first = t->dest; | |
| 589 } | |
| 590 while (first != target); | |
| 591 | |
| 592 changed = true; | |
| 593 continue; | |
| 594 } | |
| 595 ei_next (&ei); | |
| 596 } | |
| 597 | |
| 111 | 598 free (threaded_edges); |
| 0 | 599 return changed; |
| 600 } | |
| 601 | |
| 602 | |
| 603 /* Blocks A and B are to be merged into a single block. A has no incoming | |
| 604 fallthru edge, so it can be moved before B without adding or modifying | |
| 605 any jumps (aside from the jump from A to B). */ | |
| 606 | |
| 607 static void | |
| 608 merge_blocks_move_predecessor_nojumps (basic_block a, basic_block b) | |
| 609 { | |
| 111 | 610 rtx_insn *barrier; |
| 0 | 611 |
| 612 /* If we are partitioning hot/cold basic blocks, we don't want to | |
| 613 mess up unconditional or indirect jumps that cross between hot | |
| 614 and cold sections. | |
| 615 | |
| 616 Basic block partitioning may result in some jumps that appear to | |
| 617 be optimizable (or blocks that appear to be mergeable), but which really | |
| 618 must be left untouched (they are required to make it safely across | |
| 619 partition boundaries). See the comments at the top of | |
| 620 bb-reorder.c:partition_hot_cold_basic_blocks for complete details. */ | |
| 621 | |
| 622 if (BB_PARTITION (a) != BB_PARTITION (b)) | |
| 623 return; | |
| 624 | |
| 625 barrier = next_nonnote_insn (BB_END (a)); | |
| 626 gcc_assert (BARRIER_P (barrier)); | |
| 627 delete_insn (barrier); | |
| 628 | |
| 629 /* Scramble the insn chain. */ | |
| 630 if (BB_END (a) != PREV_INSN (BB_HEAD (b))) | |
| 631 reorder_insns_nobb (BB_HEAD (a), BB_END (a), PREV_INSN (BB_HEAD (b))); | |
| 632 df_set_bb_dirty (a); | |
| 633 | |
| 634 if (dump_file) | |
| 635 fprintf (dump_file, "Moved block %d before %d and merged.\n", | |
| 636 a->index, b->index); | |
| 637 | |
| 638 /* Swap the records for the two blocks around. */ | |
| 639 | |
| 640 unlink_block (a); | |
| 641 link_block (a, b->prev_bb); | |
| 642 | |
| 643 /* Now blocks A and B are contiguous. Merge them. */ | |
| 644 merge_blocks (a, b); | |
| 645 } | |
| 646 | |
| 647 /* Blocks A and B are to be merged into a single block. B has no outgoing | |
| 648 fallthru edge, so it can be moved after A without adding or modifying | |
| 649 any jumps (aside from the jump from A to B). */ | |
| 650 | |
| 651 static void | |
| 652 merge_blocks_move_successor_nojumps (basic_block a, basic_block b) | |
| 653 { | |
| 111 | 654 rtx_insn *barrier, *real_b_end; |
| 655 rtx_insn *label; | |
| 656 rtx_jump_table_data *table; | |
| 0 | 657 |
| 658 /* If we are partitioning hot/cold basic blocks, we don't want to | |
| 659 mess up unconditional or indirect jumps that cross between hot | |
| 660 and cold sections. | |
| 661 | |
| 662 Basic block partitioning may result in some jumps that appear to | |
| 663 be optimizable (or blocks that appear to be mergeable), but which really | |
| 664 must be left untouched (they are required to make it safely across | |
| 665 partition boundaries). See the comments at the top of | |
| 666 bb-reorder.c:partition_hot_cold_basic_blocks for complete details. */ | |
| 667 | |
| 668 if (BB_PARTITION (a) != BB_PARTITION (b)) | |
| 669 return; | |
| 670 | |
| 671 real_b_end = BB_END (b); | |
| 672 | |
| 673 /* If there is a jump table following block B temporarily add the jump table | |
| 674 to block B so that it will also be moved to the correct location. */ | |
| 675 if (tablejump_p (BB_END (b), &label, &table) | |
| 676 && prev_active_insn (label) == BB_END (b)) | |
| 677 { | |
| 678 BB_END (b) = table; | |
| 679 } | |
| 680 | |
| 681 /* There had better have been a barrier there. Delete it. */ | |
| 682 barrier = NEXT_INSN (BB_END (b)); | |
| 683 if (barrier && BARRIER_P (barrier)) | |
| 684 delete_insn (barrier); | |
| 685 | |
| 686 | |
| 687 /* Scramble the insn chain. */ | |
| 688 reorder_insns_nobb (BB_HEAD (b), BB_END (b), BB_END (a)); | |
| 689 | |
| 690 /* Restore the real end of b. */ | |
| 691 BB_END (b) = real_b_end; | |
| 692 | |
| 693 if (dump_file) | |
| 694 fprintf (dump_file, "Moved block %d after %d and merged.\n", | |
| 695 b->index, a->index); | |
| 696 | |
| 697 /* Now blocks A and B are contiguous. Merge them. */ | |
| 698 merge_blocks (a, b); | |
| 699 } | |
| 700 | |
| 701 /* Attempt to merge basic blocks that are potentially non-adjacent. | |
| 702 Return NULL iff the attempt failed, otherwise return basic block | |
| 703 where cleanup_cfg should continue. Because the merging commonly | |
| 704 moves basic block away or introduces another optimization | |
| 705 possibility, return basic block just before B so cleanup_cfg don't | |
| 706 need to iterate. | |
| 707 | |
| 708 It may be good idea to return basic block before C in the case | |
| 709 C has been moved after B and originally appeared earlier in the | |
| 710 insn sequence, but we have no information available about the | |
| 711 relative ordering of these two. Hopefully it is not too common. */ | |
| 712 | |
| 713 static basic_block | |
| 714 merge_blocks_move (edge e, basic_block b, basic_block c, int mode) | |
| 715 { | |
| 716 basic_block next; | |
| 717 | |
| 718 /* If we are partitioning hot/cold basic blocks, we don't want to | |
| 719 mess up unconditional or indirect jumps that cross between hot | |
| 720 and cold sections. | |
| 721 | |
| 722 Basic block partitioning may result in some jumps that appear to | |
| 723 be optimizable (or blocks that appear to be mergeable), but which really | |
| 724 must be left untouched (they are required to make it safely across | |
| 725 partition boundaries). See the comments at the top of | |
| 726 bb-reorder.c:partition_hot_cold_basic_blocks for complete details. */ | |
| 727 | |
| 728 if (BB_PARTITION (b) != BB_PARTITION (c)) | |
| 729 return NULL; | |
| 730 | |
| 731 /* If B has a fallthru edge to C, no need to move anything. */ | |
| 732 if (e->flags & EDGE_FALLTHRU) | |
| 733 { | |
| 734 int b_index = b->index, c_index = c->index; | |
| 111 | 735 |
| 736 /* Protect the loop latches. */ | |
| 737 if (current_loops && c->loop_father->latch == c) | |
| 738 return NULL; | |
| 739 | |
| 0 | 740 merge_blocks (b, c); |
| 741 update_forwarder_flag (b); | |
| 742 | |
| 743 if (dump_file) | |
| 744 fprintf (dump_file, "Merged %d and %d without moving.\n", | |
| 745 b_index, c_index); | |
| 746 | |
| 111 | 747 return b->prev_bb == ENTRY_BLOCK_PTR_FOR_FN (cfun) ? b : b->prev_bb; |
| 0 | 748 } |
| 749 | |
| 750 /* Otherwise we will need to move code around. Do that only if expensive | |
| 751 transformations are allowed. */ | |
| 752 else if (mode & CLEANUP_EXPENSIVE) | |
| 753 { | |
| 754 edge tmp_edge, b_fallthru_edge; | |
| 755 bool c_has_outgoing_fallthru; | |
| 756 bool b_has_incoming_fallthru; | |
| 757 | |
| 758 /* Avoid overactive code motion, as the forwarder blocks should be | |
| 759 eliminated by edge redirection instead. One exception might have | |
| 760 been if B is a forwarder block and C has no fallthru edge, but | |
| 761 that should be cleaned up by bb-reorder instead. */ | |
| 762 if (FORWARDER_BLOCK_P (b) || FORWARDER_BLOCK_P (c)) | |
| 763 return NULL; | |
| 764 | |
| 765 /* We must make sure to not munge nesting of lexical blocks, | |
| 766 and loop notes. This is done by squeezing out all the notes | |
| 767 and leaving them there to lie. Not ideal, but functional. */ | |
| 768 | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
769 tmp_edge = find_fallthru_edge (c->succs); |
| 0 | 770 c_has_outgoing_fallthru = (tmp_edge != NULL); |
| 771 | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
772 tmp_edge = find_fallthru_edge (b->preds); |
| 0 | 773 b_has_incoming_fallthru = (tmp_edge != NULL); |
| 774 b_fallthru_edge = tmp_edge; | |
| 775 next = b->prev_bb; | |
| 776 if (next == c) | |
| 777 next = next->prev_bb; | |
| 778 | |
| 779 /* Otherwise, we're going to try to move C after B. If C does | |
| 780 not have an outgoing fallthru, then it can be moved | |
| 781 immediately after B without introducing or modifying jumps. */ | |
| 782 if (! c_has_outgoing_fallthru) | |
| 783 { | |
| 784 merge_blocks_move_successor_nojumps (b, c); | |
| 111 | 785 return next == ENTRY_BLOCK_PTR_FOR_FN (cfun) ? next->next_bb : next; |
| 0 | 786 } |
| 787 | |
| 788 /* If B does not have an incoming fallthru, then it can be moved | |
| 789 immediately before C without introducing or modifying jumps. | |
| 790 C cannot be the first block, so we do not have to worry about | |
| 791 accessing a non-existent block. */ | |
| 792 | |
| 793 if (b_has_incoming_fallthru) | |
| 794 { | |
| 795 basic_block bb; | |
| 796 | |
| 111 | 797 if (b_fallthru_edge->src == ENTRY_BLOCK_PTR_FOR_FN (cfun)) |
| 0 | 798 return NULL; |
| 799 bb = force_nonfallthru (b_fallthru_edge); | |
| 800 if (bb) | |
| 801 notice_new_block (bb); | |
| 802 } | |
| 803 | |
| 804 merge_blocks_move_predecessor_nojumps (b, c); | |
| 111 | 805 return next == ENTRY_BLOCK_PTR_FOR_FN (cfun) ? next->next_bb : next; |
| 0 | 806 } |
| 807 | |
| 808 return NULL; | |
| 809 } | |
| 810 | |
| 811 | |
| 812 /* Removes the memory attributes of MEM expression | |
| 813 if they are not equal. */ | |
| 814 | |
| 111 | 815 static void |
| 0 | 816 merge_memattrs (rtx x, rtx y) |
| 817 { | |
| 818 int i; | |
| 819 int j; | |
| 820 enum rtx_code code; | |
| 821 const char *fmt; | |
| 822 | |
| 823 if (x == y) | |
| 824 return; | |
| 825 if (x == 0 || y == 0) | |
| 826 return; | |
| 827 | |
| 828 code = GET_CODE (x); | |
| 829 | |
| 830 if (code != GET_CODE (y)) | |
| 831 return; | |
| 832 | |
| 833 if (GET_MODE (x) != GET_MODE (y)) | |
| 834 return; | |
| 835 | |
| 111 | 836 if (code == MEM && !mem_attrs_eq_p (MEM_ATTRS (x), MEM_ATTRS (y))) |
| 0 | 837 { |
| 838 if (! MEM_ATTRS (x)) | |
| 839 MEM_ATTRS (y) = 0; | |
| 840 else if (! MEM_ATTRS (y)) | |
| 841 MEM_ATTRS (x) = 0; | |
| 842 else | |
| 843 { | |
| 844 if (MEM_ALIAS_SET (x) != MEM_ALIAS_SET (y)) | |
| 845 { | |
| 846 set_mem_alias_set (x, 0); | |
| 847 set_mem_alias_set (y, 0); | |
| 848 } | |
| 849 | |
| 850 if (! mem_expr_equal_p (MEM_EXPR (x), MEM_EXPR (y))) | |
| 851 { | |
| 852 set_mem_expr (x, 0); | |
| 853 set_mem_expr (y, 0); | |
| 111 | 854 clear_mem_offset (x); |
| 855 clear_mem_offset (y); | |
| 0 | 856 } |
| 111 | 857 else if (MEM_OFFSET_KNOWN_P (x) != MEM_OFFSET_KNOWN_P (y) |
| 858 || (MEM_OFFSET_KNOWN_P (x) | |
| 131 | 859 && maybe_ne (MEM_OFFSET (x), MEM_OFFSET (y)))) |
| 0 | 860 { |
| 111 | 861 clear_mem_offset (x); |
| 862 clear_mem_offset (y); | |
| 0 | 863 } |
| 864 | |
| 131 | 865 if (!MEM_SIZE_KNOWN_P (x)) |
| 866 clear_mem_size (y); | |
| 867 else if (!MEM_SIZE_KNOWN_P (y)) | |
| 868 clear_mem_size (x); | |
| 869 else if (known_le (MEM_SIZE (x), MEM_SIZE (y))) | |
| 870 set_mem_size (x, MEM_SIZE (y)); | |
| 871 else if (known_le (MEM_SIZE (y), MEM_SIZE (x))) | |
| 872 set_mem_size (y, MEM_SIZE (x)); | |
| 0 | 873 else |
| 111 | 874 { |
| 131 | 875 /* The sizes aren't ordered, so we can't merge them. */ |
| 111 | 876 clear_mem_size (x); |
| 877 clear_mem_size (y); | |
| 878 } | |
| 0 | 879 |
| 880 set_mem_align (x, MIN (MEM_ALIGN (x), MEM_ALIGN (y))); | |
| 881 set_mem_align (y, MEM_ALIGN (x)); | |
| 882 } | |
| 883 } | |
| 111 | 884 if (code == MEM) |
| 885 { | |
| 886 if (MEM_READONLY_P (x) != MEM_READONLY_P (y)) | |
| 887 { | |
| 888 MEM_READONLY_P (x) = 0; | |
| 889 MEM_READONLY_P (y) = 0; | |
| 890 } | |
| 891 if (MEM_NOTRAP_P (x) != MEM_NOTRAP_P (y)) | |
| 892 { | |
| 893 MEM_NOTRAP_P (x) = 0; | |
| 894 MEM_NOTRAP_P (y) = 0; | |
| 895 } | |
| 896 if (MEM_VOLATILE_P (x) != MEM_VOLATILE_P (y)) | |
| 897 { | |
| 898 MEM_VOLATILE_P (x) = 1; | |
| 899 MEM_VOLATILE_P (y) = 1; | |
| 900 } | |
| 901 } | |
| 0 | 902 |
| 903 fmt = GET_RTX_FORMAT (code); | |
| 904 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
| 905 { | |
| 906 switch (fmt[i]) | |
| 907 { | |
| 908 case 'E': | |
| 909 /* Two vectors must have the same length. */ | |
| 910 if (XVECLEN (x, i) != XVECLEN (y, i)) | |
| 911 return; | |
| 912 | |
| 913 for (j = 0; j < XVECLEN (x, i); j++) | |
| 914 merge_memattrs (XVECEXP (x, i, j), XVECEXP (y, i, j)); | |
| 915 | |
| 916 break; | |
| 917 | |
| 918 case 'e': | |
| 919 merge_memattrs (XEXP (x, i), XEXP (y, i)); | |
| 920 } | |
| 921 } | |
| 922 return; | |
| 923 } | |
| 924 | |
| 925 | |
| 111 | 926 /* Checks if patterns P1 and P2 are equivalent, apart from the possibly |
| 927 different single sets S1 and S2. */ | |
| 0 | 928 |
| 929 static bool | |
| 111 | 930 equal_different_set_p (rtx p1, rtx s1, rtx p2, rtx s2) |
| 931 { | |
| 932 int i; | |
| 933 rtx e1, e2; | |
| 934 | |
| 935 if (p1 == s1 && p2 == s2) | |
| 936 return true; | |
| 937 | |
| 938 if (GET_CODE (p1) != PARALLEL || GET_CODE (p2) != PARALLEL) | |
| 939 return false; | |
| 940 | |
| 941 if (XVECLEN (p1, 0) != XVECLEN (p2, 0)) | |
| 942 return false; | |
| 943 | |
| 944 for (i = 0; i < XVECLEN (p1, 0); i++) | |
| 945 { | |
| 946 e1 = XVECEXP (p1, 0, i); | |
| 947 e2 = XVECEXP (p2, 0, i); | |
| 948 if (e1 == s1 && e2 == s2) | |
| 949 continue; | |
| 950 if (reload_completed | |
| 951 ? rtx_renumbered_equal_p (e1, e2) : rtx_equal_p (e1, e2)) | |
| 952 continue; | |
| 953 | |
| 954 return false; | |
| 955 } | |
| 956 | |
| 957 return true; | |
| 958 } | |
| 959 | |
| 960 | |
| 961 /* NOTE1 is the REG_EQUAL note, if any, attached to an insn | |
| 962 that is a single_set with a SET_SRC of SRC1. Similarly | |
| 963 for NOTE2/SRC2. | |
| 964 | |
| 965 So effectively NOTE1/NOTE2 are an alternate form of | |
| 966 SRC1/SRC2 respectively. | |
| 967 | |
| 968 Return nonzero if SRC1 or NOTE1 has the same constant | |
| 969 integer value as SRC2 or NOTE2. Else return zero. */ | |
| 970 static int | |
| 971 values_equal_p (rtx note1, rtx note2, rtx src1, rtx src2) | |
| 972 { | |
| 973 if (note1 | |
| 974 && note2 | |
| 975 && CONST_INT_P (XEXP (note1, 0)) | |
| 976 && rtx_equal_p (XEXP (note1, 0), XEXP (note2, 0))) | |
| 977 return 1; | |
| 978 | |
| 979 if (!note1 | |
| 980 && !note2 | |
| 981 && CONST_INT_P (src1) | |
| 982 && CONST_INT_P (src2) | |
| 983 && rtx_equal_p (src1, src2)) | |
| 984 return 1; | |
| 985 | |
| 986 if (note1 | |
| 987 && CONST_INT_P (src2) | |
| 988 && rtx_equal_p (XEXP (note1, 0), src2)) | |
| 989 return 1; | |
| 990 | |
| 991 if (note2 | |
| 992 && CONST_INT_P (src1) | |
| 993 && rtx_equal_p (XEXP (note2, 0), src1)) | |
| 994 return 1; | |
| 995 | |
| 996 return 0; | |
| 997 } | |
| 998 | |
| 999 /* Examine register notes on I1 and I2 and return: | |
| 1000 - dir_forward if I1 can be replaced by I2, or | |
| 1001 - dir_backward if I2 can be replaced by I1, or | |
| 1002 - dir_both if both are the case. */ | |
| 1003 | |
| 1004 static enum replace_direction | |
| 1005 can_replace_by (rtx_insn *i1, rtx_insn *i2) | |
| 1006 { | |
| 1007 rtx s1, s2, d1, d2, src1, src2, note1, note2; | |
| 1008 bool c1, c2; | |
| 1009 | |
| 1010 /* Check for 2 sets. */ | |
| 1011 s1 = single_set (i1); | |
| 1012 s2 = single_set (i2); | |
| 1013 if (s1 == NULL_RTX || s2 == NULL_RTX) | |
| 1014 return dir_none; | |
| 1015 | |
| 1016 /* Check that the 2 sets set the same dest. */ | |
| 1017 d1 = SET_DEST (s1); | |
| 1018 d2 = SET_DEST (s2); | |
| 1019 if (!(reload_completed | |
| 1020 ? rtx_renumbered_equal_p (d1, d2) : rtx_equal_p (d1, d2))) | |
| 1021 return dir_none; | |
| 1022 | |
| 1023 /* Find identical req_equiv or reg_equal note, which implies that the 2 sets | |
| 1024 set dest to the same value. */ | |
| 1025 note1 = find_reg_equal_equiv_note (i1); | |
| 1026 note2 = find_reg_equal_equiv_note (i2); | |
| 1027 | |
| 1028 src1 = SET_SRC (s1); | |
| 1029 src2 = SET_SRC (s2); | |
| 1030 | |
| 1031 if (!values_equal_p (note1, note2, src1, src2)) | |
| 1032 return dir_none; | |
| 1033 | |
| 1034 if (!equal_different_set_p (PATTERN (i1), s1, PATTERN (i2), s2)) | |
| 1035 return dir_none; | |
| 1036 | |
| 1037 /* Although the 2 sets set dest to the same value, we cannot replace | |
| 1038 (set (dest) (const_int)) | |
| 1039 by | |
| 1040 (set (dest) (reg)) | |
| 1041 because we don't know if the reg is live and has the same value at the | |
| 1042 location of replacement. */ | |
| 1043 c1 = CONST_INT_P (src1); | |
| 1044 c2 = CONST_INT_P (src2); | |
| 1045 if (c1 && c2) | |
| 1046 return dir_both; | |
| 1047 else if (c2) | |
| 1048 return dir_forward; | |
| 1049 else if (c1) | |
| 1050 return dir_backward; | |
| 1051 | |
| 1052 return dir_none; | |
| 1053 } | |
| 1054 | |
| 1055 /* Merges directions A and B. */ | |
| 1056 | |
| 1057 static enum replace_direction | |
| 1058 merge_dir (enum replace_direction a, enum replace_direction b) | |
| 1059 { | |
| 1060 /* Implements the following table: | |
| 1061 |bo fw bw no | |
| 1062 ---+----------- | |
| 1063 bo |bo fw bw no | |
| 1064 fw |-- fw no no | |
| 1065 bw |-- -- bw no | |
| 1066 no |-- -- -- no. */ | |
| 1067 | |
| 1068 if (a == b) | |
| 1069 return a; | |
| 1070 | |
| 1071 if (a == dir_both) | |
| 1072 return b; | |
| 1073 if (b == dir_both) | |
| 1074 return a; | |
| 1075 | |
| 1076 return dir_none; | |
| 1077 } | |
| 1078 | |
| 1079 /* Array of flags indexed by reg note kind, true if the given | |
| 1080 reg note is CFA related. */ | |
| 1081 static const bool reg_note_cfa_p[] = { | |
| 1082 #undef REG_CFA_NOTE | |
| 1083 #define DEF_REG_NOTE(NAME) false, | |
| 1084 #define REG_CFA_NOTE(NAME) true, | |
| 1085 #include "reg-notes.def" | |
| 1086 #undef REG_CFA_NOTE | |
| 1087 #undef DEF_REG_NOTE | |
| 1088 false | |
| 1089 }; | |
| 1090 | |
| 1091 /* Return true if I1 and I2 have identical CFA notes (the same order | |
| 1092 and equivalent content). */ | |
| 1093 | |
| 1094 static bool | |
| 1095 insns_have_identical_cfa_notes (rtx_insn *i1, rtx_insn *i2) | |
| 1096 { | |
| 1097 rtx n1, n2; | |
| 1098 for (n1 = REG_NOTES (i1), n2 = REG_NOTES (i2); ; | |
| 1099 n1 = XEXP (n1, 1), n2 = XEXP (n2, 1)) | |
| 1100 { | |
| 1101 /* Skip over reg notes not related to CFI information. */ | |
| 1102 while (n1 && !reg_note_cfa_p[REG_NOTE_KIND (n1)]) | |
| 1103 n1 = XEXP (n1, 1); | |
| 1104 while (n2 && !reg_note_cfa_p[REG_NOTE_KIND (n2)]) | |
| 1105 n2 = XEXP (n2, 1); | |
| 1106 if (n1 == NULL_RTX && n2 == NULL_RTX) | |
| 1107 return true; | |
| 1108 if (n1 == NULL_RTX || n2 == NULL_RTX) | |
| 1109 return false; | |
| 1110 if (XEXP (n1, 0) == XEXP (n2, 0)) | |
| 1111 ; | |
| 1112 else if (XEXP (n1, 0) == NULL_RTX || XEXP (n2, 0) == NULL_RTX) | |
| 1113 return false; | |
| 1114 else if (!(reload_completed | |
| 1115 ? rtx_renumbered_equal_p (XEXP (n1, 0), XEXP (n2, 0)) | |
| 1116 : rtx_equal_p (XEXP (n1, 0), XEXP (n2, 0)))) | |
| 1117 return false; | |
| 1118 } | |
| 1119 } | |
| 1120 | |
| 1121 /* Examine I1 and I2 and return: | |
| 1122 - dir_forward if I1 can be replaced by I2, or | |
| 1123 - dir_backward if I2 can be replaced by I1, or | |
| 1124 - dir_both if both are the case. */ | |
| 1125 | |
| 1126 static enum replace_direction | |
| 1127 old_insns_match_p (int mode ATTRIBUTE_UNUSED, rtx_insn *i1, rtx_insn *i2) | |
| 0 | 1128 { |
| 1129 rtx p1, p2; | |
| 1130 | |
| 1131 /* Verify that I1 and I2 are equivalent. */ | |
| 1132 if (GET_CODE (i1) != GET_CODE (i2)) | |
| 111 | 1133 return dir_none; |
| 0 | 1134 |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1135 /* __builtin_unreachable() may lead to empty blocks (ending with |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1136 NOTE_INSN_BASIC_BLOCK). They may be crossjumped. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1137 if (NOTE_INSN_BASIC_BLOCK_P (i1) && NOTE_INSN_BASIC_BLOCK_P (i2)) |
| 111 | 1138 return dir_both; |
| 1139 | |
| 1140 /* ??? Do not allow cross-jumping between different stack levels. */ | |
| 1141 p1 = find_reg_note (i1, REG_ARGS_SIZE, NULL); | |
| 1142 p2 = find_reg_note (i2, REG_ARGS_SIZE, NULL); | |
| 1143 if (p1 && p2) | |
| 1144 { | |
| 1145 p1 = XEXP (p1, 0); | |
| 1146 p2 = XEXP (p2, 0); | |
| 1147 if (!rtx_equal_p (p1, p2)) | |
| 1148 return dir_none; | |
| 1149 | |
| 1150 /* ??? Worse, this adjustment had better be constant lest we | |
| 1151 have differing incoming stack levels. */ | |
| 1152 if (!frame_pointer_needed | |
| 131 | 1153 && known_eq (find_args_size_adjust (i1), HOST_WIDE_INT_MIN)) |
| 111 | 1154 return dir_none; |
| 1155 } | |
| 1156 else if (p1 || p2) | |
| 1157 return dir_none; | |
| 1158 | |
| 1159 /* Do not allow cross-jumping between frame related insns and other | |
| 1160 insns. */ | |
| 1161 if (RTX_FRAME_RELATED_P (i1) != RTX_FRAME_RELATED_P (i2)) | |
| 1162 return dir_none; | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1163 |
| 0 | 1164 p1 = PATTERN (i1); |
| 1165 p2 = PATTERN (i2); | |
| 1166 | |
| 1167 if (GET_CODE (p1) != GET_CODE (p2)) | |
| 111 | 1168 return dir_none; |
| 0 | 1169 |
| 1170 /* If this is a CALL_INSN, compare register usage information. | |
| 1171 If we don't check this on stack register machines, the two | |
| 1172 CALL_INSNs might be merged leaving reg-stack.c with mismatching | |
| 1173 numbers of stack registers in the same basic block. | |
| 1174 If we don't check this on machines with delay slots, a delay slot may | |
| 1175 be filled that clobbers a parameter expected by the subroutine. | |
| 1176 | |
| 1177 ??? We take the simple route for now and assume that if they're | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1178 equal, they were constructed identically. |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1179 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1180 Also check for identical exception regions. */ |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1181 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1182 if (CALL_P (i1)) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1183 { |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1184 /* Ensure the same EH region. */ |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1185 rtx n1 = find_reg_note (i1, REG_EH_REGION, 0); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1186 rtx n2 = find_reg_note (i2, REG_EH_REGION, 0); |
| 0 | 1187 |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1188 if (!n1 && n2) |
| 111 | 1189 return dir_none; |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1190 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1191 if (n1 && (!n2 || XEXP (n1, 0) != XEXP (n2, 0))) |
| 111 | 1192 return dir_none; |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1193 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1194 if (!rtx_equal_p (CALL_INSN_FUNCTION_USAGE (i1), |
| 0 | 1195 CALL_INSN_FUNCTION_USAGE (i2)) |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1196 || SIBLING_CALL_P (i1) != SIBLING_CALL_P (i2)) |
| 111 | 1197 return dir_none; |
| 1198 | |
| 1199 /* For address sanitizer, never crossjump __asan_report_* builtins, | |
| 1200 otherwise errors might be reported on incorrect lines. */ | |
| 1201 if (flag_sanitize & SANITIZE_ADDRESS) | |
| 1202 { | |
| 1203 rtx call = get_call_rtx_from (i1); | |
| 1204 if (call && GET_CODE (XEXP (XEXP (call, 0), 0)) == SYMBOL_REF) | |
| 1205 { | |
| 1206 rtx symbol = XEXP (XEXP (call, 0), 0); | |
| 1207 if (SYMBOL_REF_DECL (symbol) | |
| 1208 && TREE_CODE (SYMBOL_REF_DECL (symbol)) == FUNCTION_DECL) | |
| 1209 { | |
| 1210 if ((DECL_BUILT_IN_CLASS (SYMBOL_REF_DECL (symbol)) | |
| 1211 == BUILT_IN_NORMAL) | |
| 1212 && DECL_FUNCTION_CODE (SYMBOL_REF_DECL (symbol)) | |
| 1213 >= BUILT_IN_ASAN_REPORT_LOAD1 | |
| 1214 && DECL_FUNCTION_CODE (SYMBOL_REF_DECL (symbol)) | |
| 1215 <= BUILT_IN_ASAN_STOREN) | |
| 1216 return dir_none; | |
| 1217 } | |
| 1218 } | |
| 1219 } | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1220 } |
| 0 | 1221 |
| 111 | 1222 /* If both i1 and i2 are frame related, verify all the CFA notes |
| 1223 in the same order and with the same content. */ | |
| 1224 if (RTX_FRAME_RELATED_P (i1) && !insns_have_identical_cfa_notes (i1, i2)) | |
| 1225 return dir_none; | |
| 1226 | |
| 0 | 1227 #ifdef STACK_REGS |
| 1228 /* If cross_jump_death_matters is not 0, the insn's mode | |
| 1229 indicates whether or not the insn contains any stack-like | |
| 1230 regs. */ | |
| 1231 | |
| 1232 if ((mode & CLEANUP_POST_REGSTACK) && stack_regs_mentioned (i1)) | |
| 1233 { | |
| 1234 /* If register stack conversion has already been done, then | |
| 1235 death notes must also be compared before it is certain that | |
| 1236 the two instruction streams match. */ | |
| 1237 | |
| 1238 rtx note; | |
| 1239 HARD_REG_SET i1_regset, i2_regset; | |
| 1240 | |
| 1241 CLEAR_HARD_REG_SET (i1_regset); | |
| 1242 CLEAR_HARD_REG_SET (i2_regset); | |
| 1243 | |
| 1244 for (note = REG_NOTES (i1); note; note = XEXP (note, 1)) | |
| 1245 if (REG_NOTE_KIND (note) == REG_DEAD && STACK_REG_P (XEXP (note, 0))) | |
| 1246 SET_HARD_REG_BIT (i1_regset, REGNO (XEXP (note, 0))); | |
| 1247 | |
| 1248 for (note = REG_NOTES (i2); note; note = XEXP (note, 1)) | |
| 1249 if (REG_NOTE_KIND (note) == REG_DEAD && STACK_REG_P (XEXP (note, 0))) | |
| 1250 SET_HARD_REG_BIT (i2_regset, REGNO (XEXP (note, 0))); | |
| 1251 | |
| 1252 if (!hard_reg_set_equal_p (i1_regset, i2_regset)) | |
| 111 | 1253 return dir_none; |
| 0 | 1254 } |
| 1255 #endif | |
| 1256 | |
| 1257 if (reload_completed | |
| 1258 ? rtx_renumbered_equal_p (p1, p2) : rtx_equal_p (p1, p2)) | |
| 111 | 1259 return dir_both; |
| 1260 | |
| 1261 return can_replace_by (i1, i2); | |
| 0 | 1262 } |
| 1263 | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1264 /* When comparing insns I1 and I2 in flow_find_cross_jump or |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1265 flow_find_head_matching_sequence, ensure the notes match. */ |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1266 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1267 static void |
| 111 | 1268 merge_notes (rtx_insn *i1, rtx_insn *i2) |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1269 { |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1270 /* If the merged insns have different REG_EQUAL notes, then |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1271 remove them. */ |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1272 rtx equiv1 = find_reg_equal_equiv_note (i1); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1273 rtx equiv2 = find_reg_equal_equiv_note (i2); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1274 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1275 if (equiv1 && !equiv2) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1276 remove_note (i1, equiv1); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1277 else if (!equiv1 && equiv2) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1278 remove_note (i2, equiv2); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1279 else if (equiv1 && equiv2 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1280 && !rtx_equal_p (XEXP (equiv1, 0), XEXP (equiv2, 0))) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1281 { |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1282 remove_note (i1, equiv1); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1283 remove_note (i2, equiv2); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1284 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1285 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1286 |
| 111 | 1287 /* Walks from I1 in BB1 backward till the next non-debug insn, and returns the |
| 1288 resulting insn in I1, and the corresponding bb in BB1. At the head of a | |
| 1289 bb, if there is a predecessor bb that reaches this bb via fallthru, and | |
| 1290 FOLLOW_FALLTHRU, walks further in the predecessor bb and registers this in | |
| 1291 DID_FALLTHRU. Otherwise, stops at the head of the bb. */ | |
| 1292 | |
| 1293 static void | |
| 1294 walk_to_nondebug_insn (rtx_insn **i1, basic_block *bb1, bool follow_fallthru, | |
| 1295 bool *did_fallthru) | |
| 1296 { | |
| 1297 edge fallthru; | |
| 1298 | |
| 1299 *did_fallthru = false; | |
| 1300 | |
| 1301 /* Ignore notes. */ | |
| 1302 while (!NONDEBUG_INSN_P (*i1)) | |
| 1303 { | |
| 1304 if (*i1 != BB_HEAD (*bb1)) | |
| 1305 { | |
| 1306 *i1 = PREV_INSN (*i1); | |
| 1307 continue; | |
| 1308 } | |
| 1309 | |
| 1310 if (!follow_fallthru) | |
| 1311 return; | |
| 1312 | |
| 1313 fallthru = find_fallthru_edge ((*bb1)->preds); | |
| 1314 if (!fallthru || fallthru->src == ENTRY_BLOCK_PTR_FOR_FN (cfun) | |
| 1315 || !single_succ_p (fallthru->src)) | |
| 1316 return; | |
| 1317 | |
| 1318 *bb1 = fallthru->src; | |
| 1319 *i1 = BB_END (*bb1); | |
| 1320 *did_fallthru = true; | |
| 1321 } | |
| 1322 } | |
| 1323 | |
| 0 | 1324 /* Look through the insns at the end of BB1 and BB2 and find the longest |
| 111 | 1325 sequence that are either equivalent, or allow forward or backward |
| 1326 replacement. Store the first insns for that sequence in *F1 and *F2 and | |
| 1327 return the sequence length. | |
| 1328 | |
| 1329 DIR_P indicates the allowed replacement direction on function entry, and | |
| 1330 the actual replacement direction on function exit. If NULL, only equivalent | |
| 1331 sequences are allowed. | |
| 0 | 1332 |
| 1333 To simplify callers of this function, if the blocks match exactly, | |
| 1334 store the head of the blocks in *F1 and *F2. */ | |
| 1335 | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1336 int |
| 111 | 1337 flow_find_cross_jump (basic_block bb1, basic_block bb2, rtx_insn **f1, |
| 1338 rtx_insn **f2, enum replace_direction *dir_p) | |
| 0 | 1339 { |
| 111 | 1340 rtx_insn *i1, *i2, *last1, *last2, *afterlast1, *afterlast2; |
| 0 | 1341 int ninsns = 0; |
| 111 | 1342 enum replace_direction dir, last_dir, afterlast_dir; |
| 1343 bool follow_fallthru, did_fallthru; | |
| 1344 | |
| 1345 if (dir_p) | |
| 1346 dir = *dir_p; | |
| 1347 else | |
| 1348 dir = dir_both; | |
| 1349 afterlast_dir = dir; | |
| 1350 last_dir = afterlast_dir; | |
| 0 | 1351 |
| 1352 /* Skip simple jumps at the end of the blocks. Complex jumps still | |
| 1353 need to be compared for equivalence, which we'll do below. */ | |
| 1354 | |
| 1355 i1 = BB_END (bb1); | |
| 111 | 1356 last1 = afterlast1 = last2 = afterlast2 = NULL; |
| 0 | 1357 if (onlyjump_p (i1) |
| 1358 || (returnjump_p (i1) && !side_effects_p (PATTERN (i1)))) | |
| 1359 { | |
| 1360 last1 = i1; | |
| 1361 i1 = PREV_INSN (i1); | |
| 1362 } | |
| 1363 | |
| 1364 i2 = BB_END (bb2); | |
| 1365 if (onlyjump_p (i2) | |
| 1366 || (returnjump_p (i2) && !side_effects_p (PATTERN (i2)))) | |
| 1367 { | |
| 1368 last2 = i2; | |
| 111 | 1369 /* Count everything except for unconditional jump as insn. |
| 1370 Don't count any jumps if dir_p is NULL. */ | |
| 1371 if (!simplejump_p (i2) && !returnjump_p (i2) && last1 && dir_p) | |
| 0 | 1372 ninsns++; |
| 1373 i2 = PREV_INSN (i2); | |
| 1374 } | |
| 1375 | |
| 1376 while (true) | |
| 1377 { | |
| 111 | 1378 /* In the following example, we can replace all jumps to C by jumps to A. |
| 1379 | |
| 1380 This removes 4 duplicate insns. | |
| 1381 [bb A] insn1 [bb C] insn1 | |
| 1382 insn2 insn2 | |
| 1383 [bb B] insn3 insn3 | |
| 1384 insn4 insn4 | |
| 1385 jump_insn jump_insn | |
| 1386 | |
| 1387 We could also replace all jumps to A by jumps to C, but that leaves B | |
| 1388 alive, and removes only 2 duplicate insns. In a subsequent crossjump | |
| 1389 step, all jumps to B would be replaced with jumps to the middle of C, | |
| 1390 achieving the same result with more effort. | |
| 1391 So we allow only the first possibility, which means that we don't allow | |
| 1392 fallthru in the block that's being replaced. */ | |
| 1393 | |
| 1394 follow_fallthru = dir_p && dir != dir_forward; | |
| 1395 walk_to_nondebug_insn (&i1, &bb1, follow_fallthru, &did_fallthru); | |
| 1396 if (did_fallthru) | |
| 1397 dir = dir_backward; | |
| 1398 | |
| 1399 follow_fallthru = dir_p && dir != dir_backward; | |
| 1400 walk_to_nondebug_insn (&i2, &bb2, follow_fallthru, &did_fallthru); | |
| 1401 if (did_fallthru) | |
| 1402 dir = dir_forward; | |
| 0 | 1403 |
| 1404 if (i1 == BB_HEAD (bb1) || i2 == BB_HEAD (bb2)) | |
| 1405 break; | |
| 1406 | |
| 111 | 1407 /* Do not turn corssing edge to non-crossing or vice versa after |
| 1408 reload. */ | |
| 1409 if (BB_PARTITION (BLOCK_FOR_INSN (i1)) | |
| 1410 != BB_PARTITION (BLOCK_FOR_INSN (i2)) | |
| 1411 && reload_completed) | |
| 1412 break; | |
| 1413 | |
| 1414 dir = merge_dir (dir, old_insns_match_p (0, i1, i2)); | |
| 1415 if (dir == dir_none || (!dir_p && dir != dir_both)) | |
| 0 | 1416 break; |
| 1417 | |
| 1418 merge_memattrs (i1, i2); | |
| 1419 | |
| 1420 /* Don't begin a cross-jump with a NOTE insn. */ | |
| 1421 if (INSN_P (i1)) | |
| 1422 { | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1423 merge_notes (i1, i2); |
| 0 | 1424 |
| 1425 afterlast1 = last1, afterlast2 = last2; | |
| 1426 last1 = i1, last2 = i2; | |
| 111 | 1427 afterlast_dir = last_dir; |
| 1428 last_dir = dir; | |
| 1429 if (active_insn_p (i1)) | |
| 1430 ninsns++; | |
| 0 | 1431 } |
| 1432 | |
| 1433 i1 = PREV_INSN (i1); | |
| 1434 i2 = PREV_INSN (i2); | |
| 1435 } | |
| 1436 | |
| 1437 /* Don't allow the insn after a compare to be shared by | |
| 1438 cross-jumping unless the compare is also shared. */ | |
| 111 | 1439 if (HAVE_cc0 && ninsns && reg_mentioned_p (cc0_rtx, last1) |
| 1440 && ! sets_cc0_p (last1)) | |
| 1441 last1 = afterlast1, last2 = afterlast2, last_dir = afterlast_dir, ninsns--; | |
| 0 | 1442 |
| 1443 /* Include preceding notes and labels in the cross-jump. One, | |
| 1444 this may bring us to the head of the blocks as requested above. | |
| 1445 Two, it keeps line number notes as matched as may be. */ | |
| 1446 if (ninsns) | |
| 1447 { | |
| 111 | 1448 bb1 = BLOCK_FOR_INSN (last1); |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1449 while (last1 != BB_HEAD (bb1) && !NONDEBUG_INSN_P (PREV_INSN (last1))) |
| 0 | 1450 last1 = PREV_INSN (last1); |
| 1451 | |
| 1452 if (last1 != BB_HEAD (bb1) && LABEL_P (PREV_INSN (last1))) | |
| 1453 last1 = PREV_INSN (last1); | |
| 1454 | |
| 111 | 1455 bb2 = BLOCK_FOR_INSN (last2); |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1456 while (last2 != BB_HEAD (bb2) && !NONDEBUG_INSN_P (PREV_INSN (last2))) |
| 0 | 1457 last2 = PREV_INSN (last2); |
| 1458 | |
| 1459 if (last2 != BB_HEAD (bb2) && LABEL_P (PREV_INSN (last2))) | |
| 1460 last2 = PREV_INSN (last2); | |
| 1461 | |
| 1462 *f1 = last1; | |
| 1463 *f2 = last2; | |
| 1464 } | |
| 1465 | |
| 111 | 1466 if (dir_p) |
| 1467 *dir_p = last_dir; | |
| 0 | 1468 return ninsns; |
| 1469 } | |
| 1470 | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1471 /* Like flow_find_cross_jump, except start looking for a matching sequence from |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1472 the head of the two blocks. Do not include jumps at the end. |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1473 If STOP_AFTER is nonzero, stop after finding that many matching |
| 111 | 1474 instructions. If STOP_AFTER is zero, count all INSN_P insns, if it is |
| 1475 non-zero, only count active insns. */ | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1476 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1477 int |
| 111 | 1478 flow_find_head_matching_sequence (basic_block bb1, basic_block bb2, rtx_insn **f1, |
| 1479 rtx_insn **f2, int stop_after) | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1480 { |
| 111 | 1481 rtx_insn *i1, *i2, *last1, *last2, *beforelast1, *beforelast2; |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1482 int ninsns = 0; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1483 edge e; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1484 edge_iterator ei; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1485 int nehedges1 = 0, nehedges2 = 0; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1486 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1487 FOR_EACH_EDGE (e, ei, bb1->succs) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1488 if (e->flags & EDGE_EH) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1489 nehedges1++; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1490 FOR_EACH_EDGE (e, ei, bb2->succs) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1491 if (e->flags & EDGE_EH) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1492 nehedges2++; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1493 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1494 i1 = BB_HEAD (bb1); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1495 i2 = BB_HEAD (bb2); |
| 111 | 1496 last1 = beforelast1 = last2 = beforelast2 = NULL; |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1497 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1498 while (true) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1499 { |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1500 /* Ignore notes, except NOTE_INSN_EPILOGUE_BEG. */ |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1501 while (!NONDEBUG_INSN_P (i1) && i1 != BB_END (bb1)) |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1502 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1503 if (NOTE_P (i1) && NOTE_KIND (i1) == NOTE_INSN_EPILOGUE_BEG) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1504 break; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1505 i1 = NEXT_INSN (i1); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1506 } |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1507 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1508 while (!NONDEBUG_INSN_P (i2) && i2 != BB_END (bb2)) |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1509 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1510 if (NOTE_P (i2) && NOTE_KIND (i2) == NOTE_INSN_EPILOGUE_BEG) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1511 break; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1512 i2 = NEXT_INSN (i2); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1513 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1514 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1515 if ((i1 == BB_END (bb1) && !NONDEBUG_INSN_P (i1)) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1516 || (i2 == BB_END (bb2) && !NONDEBUG_INSN_P (i2))) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1517 break; |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1518 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1519 if (NOTE_P (i1) || NOTE_P (i2) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1520 || JUMP_P (i1) || JUMP_P (i2)) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1521 break; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1522 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1523 /* A sanity check to make sure we're not merging insns with different |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1524 effects on EH. If only one of them ends a basic block, it shouldn't |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1525 have an EH edge; if both end a basic block, there should be the same |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1526 number of EH edges. */ |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1527 if ((i1 == BB_END (bb1) && i2 != BB_END (bb2) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1528 && nehedges1 > 0) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1529 || (i2 == BB_END (bb2) && i1 != BB_END (bb1) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1530 && nehedges2 > 0) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1531 || (i1 == BB_END (bb1) && i2 == BB_END (bb2) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1532 && nehedges1 != nehedges2)) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1533 break; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1534 |
| 111 | 1535 if (old_insns_match_p (0, i1, i2) != dir_both) |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1536 break; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1537 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1538 merge_memattrs (i1, i2); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1539 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1540 /* Don't begin a cross-jump with a NOTE insn. */ |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1541 if (INSN_P (i1)) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1542 { |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1543 merge_notes (i1, i2); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1544 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1545 beforelast1 = last1, beforelast2 = last2; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1546 last1 = i1, last2 = i2; |
| 111 | 1547 if (!stop_after || active_insn_p (i1)) |
| 1548 ninsns++; | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1549 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1550 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1551 if (i1 == BB_END (bb1) || i2 == BB_END (bb2) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1552 || (stop_after > 0 && ninsns == stop_after)) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1553 break; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1554 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1555 i1 = NEXT_INSN (i1); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1556 i2 = NEXT_INSN (i2); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1557 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1558 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1559 /* Don't allow a compare to be shared by cross-jumping unless the insn |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1560 after the compare is also shared. */ |
| 111 | 1561 if (HAVE_cc0 && ninsns && reg_mentioned_p (cc0_rtx, last1) |
| 1562 && sets_cc0_p (last1)) | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1563 last1 = beforelast1, last2 = beforelast2, ninsns--; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1564 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1565 if (ninsns) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1566 { |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1567 *f1 = last1; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1568 *f2 = last2; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1569 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1570 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1571 return ninsns; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1572 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1573 |
| 0 | 1574 /* Return true iff outgoing edges of BB1 and BB2 match, together with |
| 1575 the branch instruction. This means that if we commonize the control | |
| 1576 flow before end of the basic block, the semantic remains unchanged. | |
| 1577 | |
| 1578 We may assume that there exists one edge with a common destination. */ | |
| 1579 | |
| 1580 static bool | |
| 1581 outgoing_edges_match (int mode, basic_block bb1, basic_block bb2) | |
| 1582 { | |
| 1583 int nehedges1 = 0, nehedges2 = 0; | |
| 1584 edge fallthru1 = 0, fallthru2 = 0; | |
| 1585 edge e1, e2; | |
| 1586 edge_iterator ei; | |
| 1587 | |
| 111 | 1588 /* If we performed shrink-wrapping, edges to the exit block can |
| 1589 only be distinguished for JUMP_INSNs. The two paths may differ in | |
| 1590 whether they went through the prologue. Sibcalls are fine, we know | |
| 1591 that we either didn't need or inserted an epilogue before them. */ | |
| 1592 if (crtl->shrink_wrapped | |
| 1593 && single_succ_p (bb1) | |
| 1594 && single_succ (bb1) == EXIT_BLOCK_PTR_FOR_FN (cfun) | |
| 1595 && !JUMP_P (BB_END (bb1)) | |
| 1596 && !(CALL_P (BB_END (bb1)) && SIBLING_CALL_P (BB_END (bb1)))) | |
| 1597 return false; | |
| 1598 | |
| 0 | 1599 /* If BB1 has only one successor, we may be looking at either an |
| 1600 unconditional jump, or a fake edge to exit. */ | |
| 1601 if (single_succ_p (bb1) | |
| 1602 && (single_succ_edge (bb1)->flags & (EDGE_COMPLEX | EDGE_FAKE)) == 0 | |
| 1603 && (!JUMP_P (BB_END (bb1)) || simplejump_p (BB_END (bb1)))) | |
| 1604 return (single_succ_p (bb2) | |
| 1605 && (single_succ_edge (bb2)->flags | |
| 1606 & (EDGE_COMPLEX | EDGE_FAKE)) == 0 | |
| 1607 && (!JUMP_P (BB_END (bb2)) || simplejump_p (BB_END (bb2)))); | |
| 1608 | |
| 1609 /* Match conditional jumps - this may get tricky when fallthru and branch | |
| 1610 edges are crossed. */ | |
| 1611 if (EDGE_COUNT (bb1->succs) == 2 | |
| 1612 && any_condjump_p (BB_END (bb1)) | |
| 1613 && onlyjump_p (BB_END (bb1))) | |
| 1614 { | |
| 1615 edge b1, f1, b2, f2; | |
| 1616 bool reverse, match; | |
| 1617 rtx set1, set2, cond1, cond2; | |
| 1618 enum rtx_code code1, code2; | |
| 1619 | |
| 1620 if (EDGE_COUNT (bb2->succs) != 2 | |
| 1621 || !any_condjump_p (BB_END (bb2)) | |
| 1622 || !onlyjump_p (BB_END (bb2))) | |
| 1623 return false; | |
| 1624 | |
| 1625 b1 = BRANCH_EDGE (bb1); | |
| 1626 b2 = BRANCH_EDGE (bb2); | |
| 1627 f1 = FALLTHRU_EDGE (bb1); | |
| 1628 f2 = FALLTHRU_EDGE (bb2); | |
| 1629 | |
| 1630 /* Get around possible forwarders on fallthru edges. Other cases | |
| 1631 should be optimized out already. */ | |
| 1632 if (FORWARDER_BLOCK_P (f1->dest)) | |
| 1633 f1 = single_succ_edge (f1->dest); | |
| 1634 | |
| 1635 if (FORWARDER_BLOCK_P (f2->dest)) | |
| 1636 f2 = single_succ_edge (f2->dest); | |
| 1637 | |
| 1638 /* To simplify use of this function, return false if there are | |
| 1639 unneeded forwarder blocks. These will get eliminated later | |
| 1640 during cleanup_cfg. */ | |
| 1641 if (FORWARDER_BLOCK_P (f1->dest) | |
| 1642 || FORWARDER_BLOCK_P (f2->dest) | |
| 1643 || FORWARDER_BLOCK_P (b1->dest) | |
| 1644 || FORWARDER_BLOCK_P (b2->dest)) | |
| 1645 return false; | |
| 1646 | |
| 1647 if (f1->dest == f2->dest && b1->dest == b2->dest) | |
| 1648 reverse = false; | |
| 1649 else if (f1->dest == b2->dest && b1->dest == f2->dest) | |
| 1650 reverse = true; | |
| 1651 else | |
| 1652 return false; | |
| 1653 | |
| 1654 set1 = pc_set (BB_END (bb1)); | |
| 1655 set2 = pc_set (BB_END (bb2)); | |
| 1656 if ((XEXP (SET_SRC (set1), 1) == pc_rtx) | |
| 1657 != (XEXP (SET_SRC (set2), 1) == pc_rtx)) | |
| 1658 reverse = !reverse; | |
| 1659 | |
| 1660 cond1 = XEXP (SET_SRC (set1), 0); | |
| 1661 cond2 = XEXP (SET_SRC (set2), 0); | |
| 1662 code1 = GET_CODE (cond1); | |
| 1663 if (reverse) | |
| 1664 code2 = reversed_comparison_code (cond2, BB_END (bb2)); | |
| 1665 else | |
| 1666 code2 = GET_CODE (cond2); | |
| 1667 | |
| 1668 if (code2 == UNKNOWN) | |
| 1669 return false; | |
| 1670 | |
| 1671 /* Verify codes and operands match. */ | |
| 1672 match = ((code1 == code2 | |
| 1673 && rtx_renumbered_equal_p (XEXP (cond1, 0), XEXP (cond2, 0)) | |
| 1674 && rtx_renumbered_equal_p (XEXP (cond1, 1), XEXP (cond2, 1))) | |
| 1675 || (code1 == swap_condition (code2) | |
| 1676 && rtx_renumbered_equal_p (XEXP (cond1, 1), | |
| 1677 XEXP (cond2, 0)) | |
| 1678 && rtx_renumbered_equal_p (XEXP (cond1, 0), | |
| 1679 XEXP (cond2, 1)))); | |
| 1680 | |
| 1681 /* If we return true, we will join the blocks. Which means that | |
| 1682 we will only have one branch prediction bit to work with. Thus | |
| 1683 we require the existing branches to have probabilities that are | |
| 1684 roughly similar. */ | |
| 1685 if (match | |
| 1686 && optimize_bb_for_speed_p (bb1) | |
| 1687 && optimize_bb_for_speed_p (bb2)) | |
| 1688 { | |
| 111 | 1689 profile_probability prob2; |
| 0 | 1690 |
| 1691 if (b1->dest == b2->dest) | |
| 1692 prob2 = b2->probability; | |
| 1693 else | |
| 1694 /* Do not use f2 probability as f2 may be forwarded. */ | |
| 111 | 1695 prob2 = b2->probability.invert (); |
| 0 | 1696 |
| 1697 /* Fail if the difference in probabilities is greater than 50%. | |
| 1698 This rules out two well-predicted branches with opposite | |
| 1699 outcomes. */ | |
| 111 | 1700 if (b1->probability.differs_lot_from_p (prob2)) |
| 0 | 1701 { |
| 1702 if (dump_file) | |
| 111 | 1703 { |
| 1704 fprintf (dump_file, | |
| 1705 "Outcomes of branch in bb %i and %i differ too" | |
| 1706 " much (", bb1->index, bb2->index); | |
| 1707 b1->probability.dump (dump_file); | |
| 1708 prob2.dump (dump_file); | |
| 1709 fprintf (dump_file, ")\n"); | |
| 1710 } | |
| 0 | 1711 return false; |
| 1712 } | |
| 1713 } | |
| 1714 | |
| 1715 if (dump_file && match) | |
| 1716 fprintf (dump_file, "Conditionals in bb %i and %i match.\n", | |
| 1717 bb1->index, bb2->index); | |
| 1718 | |
| 1719 return match; | |
| 1720 } | |
| 1721 | |
| 1722 /* Generic case - we are seeing a computed jump, table jump or trapping | |
| 1723 instruction. */ | |
| 1724 | |
| 1725 /* Check whether there are tablejumps in the end of BB1 and BB2. | |
| 1726 Return true if they are identical. */ | |
| 1727 { | |
| 111 | 1728 rtx_insn *label1, *label2; |
| 1729 rtx_jump_table_data *table1, *table2; | |
| 0 | 1730 |
| 1731 if (tablejump_p (BB_END (bb1), &label1, &table1) | |
| 1732 && tablejump_p (BB_END (bb2), &label2, &table2) | |
| 1733 && GET_CODE (PATTERN (table1)) == GET_CODE (PATTERN (table2))) | |
| 1734 { | |
| 1735 /* The labels should never be the same rtx. If they really are same | |
| 1736 the jump tables are same too. So disable crossjumping of blocks BB1 | |
| 1737 and BB2 because when deleting the common insns in the end of BB1 | |
| 1738 by delete_basic_block () the jump table would be deleted too. */ | |
| 1739 /* If LABEL2 is referenced in BB1->END do not do anything | |
| 1740 because we would loose information when replacing | |
| 1741 LABEL1 by LABEL2 and then LABEL2 by LABEL1 in BB1->END. */ | |
| 1742 if (label1 != label2 && !rtx_referenced_p (label2, BB_END (bb1))) | |
| 1743 { | |
| 1744 /* Set IDENTICAL to true when the tables are identical. */ | |
| 1745 bool identical = false; | |
| 1746 rtx p1, p2; | |
| 1747 | |
| 1748 p1 = PATTERN (table1); | |
| 1749 p2 = PATTERN (table2); | |
| 1750 if (GET_CODE (p1) == ADDR_VEC && rtx_equal_p (p1, p2)) | |
| 1751 { | |
| 1752 identical = true; | |
| 1753 } | |
| 1754 else if (GET_CODE (p1) == ADDR_DIFF_VEC | |
| 1755 && (XVECLEN (p1, 1) == XVECLEN (p2, 1)) | |
| 1756 && rtx_equal_p (XEXP (p1, 2), XEXP (p2, 2)) | |
| 1757 && rtx_equal_p (XEXP (p1, 3), XEXP (p2, 3))) | |
| 1758 { | |
| 1759 int i; | |
| 1760 | |
| 1761 identical = true; | |
| 1762 for (i = XVECLEN (p1, 1) - 1; i >= 0 && identical; i--) | |
| 1763 if (!rtx_equal_p (XVECEXP (p1, 1, i), XVECEXP (p2, 1, i))) | |
| 1764 identical = false; | |
| 1765 } | |
| 1766 | |
| 1767 if (identical) | |
| 1768 { | |
| 1769 bool match; | |
| 1770 | |
| 1771 /* Temporarily replace references to LABEL1 with LABEL2 | |
| 1772 in BB1->END so that we could compare the instructions. */ | |
| 111 | 1773 replace_label_in_insn (BB_END (bb1), label1, label2, false); |
| 1774 | |
| 1775 match = (old_insns_match_p (mode, BB_END (bb1), BB_END (bb2)) | |
| 1776 == dir_both); | |
| 0 | 1777 if (dump_file && match) |
| 1778 fprintf (dump_file, | |
| 1779 "Tablejumps in bb %i and %i match.\n", | |
| 1780 bb1->index, bb2->index); | |
| 1781 | |
| 1782 /* Set the original label in BB1->END because when deleting | |
| 1783 a block whose end is a tablejump, the tablejump referenced | |
| 1784 from the instruction is deleted too. */ | |
| 111 | 1785 replace_label_in_insn (BB_END (bb1), label2, label1, false); |
| 0 | 1786 |
| 1787 return match; | |
| 1788 } | |
| 1789 } | |
| 1790 return false; | |
| 1791 } | |
| 1792 } | |
| 1793 | |
| 111 | 1794 /* Find the last non-debug non-note instruction in each bb, except |
| 1795 stop when we see the NOTE_INSN_BASIC_BLOCK, as old_insns_match_p | |
| 1796 handles that case specially. old_insns_match_p does not handle | |
| 1797 other types of instruction notes. */ | |
| 1798 rtx_insn *last1 = BB_END (bb1); | |
| 1799 rtx_insn *last2 = BB_END (bb2); | |
| 1800 while (!NOTE_INSN_BASIC_BLOCK_P (last1) && | |
| 1801 (DEBUG_INSN_P (last1) || NOTE_P (last1))) | |
| 1802 last1 = PREV_INSN (last1); | |
| 1803 while (!NOTE_INSN_BASIC_BLOCK_P (last2) && | |
| 1804 (DEBUG_INSN_P (last2) || NOTE_P (last2))) | |
| 1805 last2 = PREV_INSN (last2); | |
| 1806 gcc_assert (last1 && last2); | |
| 1807 | |
| 0 | 1808 /* First ensure that the instructions match. There may be many outgoing |
| 1809 edges so this test is generally cheaper. */ | |
| 111 | 1810 if (old_insns_match_p (mode, last1, last2) != dir_both) |
| 0 | 1811 return false; |
| 1812 | |
| 1813 /* Search the outgoing edges, ensure that the counts do match, find possible | |
| 1814 fallthru and exception handling edges since these needs more | |
| 1815 validation. */ | |
| 1816 if (EDGE_COUNT (bb1->succs) != EDGE_COUNT (bb2->succs)) | |
| 1817 return false; | |
| 1818 | |
| 111 | 1819 bool nonfakeedges = false; |
| 0 | 1820 FOR_EACH_EDGE (e1, ei, bb1->succs) |
| 1821 { | |
| 1822 e2 = EDGE_SUCC (bb2, ei.index); | |
| 1823 | |
| 111 | 1824 if ((e1->flags & EDGE_FAKE) == 0) |
| 1825 nonfakeedges = true; | |
| 1826 | |
| 0 | 1827 if (e1->flags & EDGE_EH) |
| 1828 nehedges1++; | |
| 1829 | |
| 1830 if (e2->flags & EDGE_EH) | |
| 1831 nehedges2++; | |
| 1832 | |
| 1833 if (e1->flags & EDGE_FALLTHRU) | |
| 1834 fallthru1 = e1; | |
| 1835 if (e2->flags & EDGE_FALLTHRU) | |
| 1836 fallthru2 = e2; | |
| 1837 } | |
| 1838 | |
| 1839 /* If number of edges of various types does not match, fail. */ | |
| 1840 if (nehedges1 != nehedges2 | |
| 1841 || (fallthru1 != 0) != (fallthru2 != 0)) | |
| 1842 return false; | |
| 1843 | |
| 111 | 1844 /* If !ACCUMULATE_OUTGOING_ARGS, bb1 (and bb2) have no successors |
| 1845 and the last real insn doesn't have REG_ARGS_SIZE note, don't | |
| 1846 attempt to optimize, as the two basic blocks might have different | |
| 1847 REG_ARGS_SIZE depths. For noreturn calls and unconditional | |
| 1848 traps there should be REG_ARG_SIZE notes, they could be missing | |
| 1849 for __builtin_unreachable () uses though. */ | |
| 1850 if (!nonfakeedges | |
| 1851 && !ACCUMULATE_OUTGOING_ARGS | |
| 1852 && (!INSN_P (last1) | |
| 1853 || !find_reg_note (last1, REG_ARGS_SIZE, NULL))) | |
| 1854 return false; | |
| 1855 | |
| 0 | 1856 /* fallthru edges must be forwarded to the same destination. */ |
| 1857 if (fallthru1) | |
| 1858 { | |
| 1859 basic_block d1 = (forwarder_block_p (fallthru1->dest) | |
| 1860 ? single_succ (fallthru1->dest): fallthru1->dest); | |
| 1861 basic_block d2 = (forwarder_block_p (fallthru2->dest) | |
| 1862 ? single_succ (fallthru2->dest): fallthru2->dest); | |
| 1863 | |
| 1864 if (d1 != d2) | |
| 1865 return false; | |
| 1866 } | |
| 1867 | |
| 1868 /* Ensure the same EH region. */ | |
| 1869 { | |
| 1870 rtx n1 = find_reg_note (BB_END (bb1), REG_EH_REGION, 0); | |
| 1871 rtx n2 = find_reg_note (BB_END (bb2), REG_EH_REGION, 0); | |
| 1872 | |
| 1873 if (!n1 && n2) | |
| 1874 return false; | |
| 1875 | |
| 1876 if (n1 && (!n2 || XEXP (n1, 0) != XEXP (n2, 0))) | |
| 1877 return false; | |
| 1878 } | |
| 1879 | |
| 1880 /* The same checks as in try_crossjump_to_edge. It is required for RTL | |
| 1881 version of sequence abstraction. */ | |
| 1882 FOR_EACH_EDGE (e1, ei, bb2->succs) | |
| 1883 { | |
| 1884 edge e2; | |
| 1885 edge_iterator ei; | |
| 1886 basic_block d1 = e1->dest; | |
| 1887 | |
| 1888 if (FORWARDER_BLOCK_P (d1)) | |
| 1889 d1 = EDGE_SUCC (d1, 0)->dest; | |
| 1890 | |
| 1891 FOR_EACH_EDGE (e2, ei, bb1->succs) | |
| 1892 { | |
| 1893 basic_block d2 = e2->dest; | |
| 1894 if (FORWARDER_BLOCK_P (d2)) | |
| 1895 d2 = EDGE_SUCC (d2, 0)->dest; | |
| 1896 if (d1 == d2) | |
| 1897 break; | |
| 1898 } | |
| 1899 | |
| 1900 if (!e2) | |
| 1901 return false; | |
| 1902 } | |
| 1903 | |
| 1904 return true; | |
| 1905 } | |
| 1906 | |
| 1907 /* Returns true if BB basic block has a preserve label. */ | |
| 1908 | |
| 1909 static bool | |
| 1910 block_has_preserve_label (basic_block bb) | |
| 1911 { | |
| 1912 return (bb | |
| 1913 && block_label (bb) | |
| 1914 && LABEL_PRESERVE_P (block_label (bb))); | |
| 1915 } | |
| 1916 | |
| 1917 /* E1 and E2 are edges with the same destination block. Search their | |
| 1918 predecessors for common code. If found, redirect control flow from | |
| 111 | 1919 (maybe the middle of) E1->SRC to (maybe the middle of) E2->SRC (dir_forward), |
| 1920 or the other way around (dir_backward). DIR specifies the allowed | |
| 1921 replacement direction. */ | |
| 0 | 1922 |
| 1923 static bool | |
| 111 | 1924 try_crossjump_to_edge (int mode, edge e1, edge e2, |
| 1925 enum replace_direction dir) | |
| 0 | 1926 { |
| 1927 int nmatch; | |
| 1928 basic_block src1 = e1->src, src2 = e2->src; | |
| 1929 basic_block redirect_to, redirect_from, to_remove; | |
| 111 | 1930 basic_block osrc1, osrc2, redirect_edges_to, tmp; |
| 1931 rtx_insn *newpos1, *newpos2; | |
| 0 | 1932 edge s; |
| 1933 edge_iterator ei; | |
| 1934 | |
| 111 | 1935 newpos1 = newpos2 = NULL; |
| 0 | 1936 |
| 1937 /* Search backward through forwarder blocks. We don't need to worry | |
| 1938 about multiple entry or chained forwarders, as they will be optimized | |
| 1939 away. We do this to look past the unconditional jump following a | |
| 1940 conditional jump that is required due to the current CFG shape. */ | |
| 1941 if (single_pred_p (src1) | |
| 1942 && FORWARDER_BLOCK_P (src1)) | |
| 1943 e1 = single_pred_edge (src1), src1 = e1->src; | |
| 1944 | |
| 1945 if (single_pred_p (src2) | |
| 1946 && FORWARDER_BLOCK_P (src2)) | |
| 1947 e2 = single_pred_edge (src2), src2 = e2->src; | |
| 1948 | |
| 1949 /* Nothing to do if we reach ENTRY, or a common source block. */ | |
| 111 | 1950 if (src1 == ENTRY_BLOCK_PTR_FOR_FN (cfun) || src2 |
| 1951 == ENTRY_BLOCK_PTR_FOR_FN (cfun)) | |
| 0 | 1952 return false; |
| 1953 if (src1 == src2) | |
| 1954 return false; | |
| 1955 | |
| 1956 /* Seeing more than 1 forwarder blocks would confuse us later... */ | |
| 1957 if (FORWARDER_BLOCK_P (e1->dest) | |
| 1958 && FORWARDER_BLOCK_P (single_succ (e1->dest))) | |
| 1959 return false; | |
| 1960 | |
| 1961 if (FORWARDER_BLOCK_P (e2->dest) | |
| 1962 && FORWARDER_BLOCK_P (single_succ (e2->dest))) | |
| 1963 return false; | |
| 1964 | |
| 1965 /* Likewise with dead code (possibly newly created by the other optimizations | |
| 1966 of cfg_cleanup). */ | |
| 1967 if (EDGE_COUNT (src1->preds) == 0 || EDGE_COUNT (src2->preds) == 0) | |
| 1968 return false; | |
| 1969 | |
| 111 | 1970 /* Do not turn corssing edge to non-crossing or vice versa after reload. */ |
| 1971 if (BB_PARTITION (src1) != BB_PARTITION (src2) | |
| 1972 && reload_completed) | |
| 1973 return false; | |
| 1974 | |
| 0 | 1975 /* Look for the common insn sequence, part the first ... */ |
| 1976 if (!outgoing_edges_match (mode, src1, src2)) | |
| 1977 return false; | |
| 1978 | |
| 1979 /* ... and part the second. */ | |
| 111 | 1980 nmatch = flow_find_cross_jump (src1, src2, &newpos1, &newpos2, &dir); |
| 1981 | |
| 1982 osrc1 = src1; | |
| 1983 osrc2 = src2; | |
| 1984 if (newpos1 != NULL_RTX) | |
| 1985 src1 = BLOCK_FOR_INSN (newpos1); | |
| 1986 if (newpos2 != NULL_RTX) | |
| 1987 src2 = BLOCK_FOR_INSN (newpos2); | |
| 1988 | |
| 1989 /* Check that SRC1 and SRC2 have preds again. They may have changed | |
| 1990 above due to the call to flow_find_cross_jump. */ | |
| 1991 if (EDGE_COUNT (src1->preds) == 0 || EDGE_COUNT (src2->preds) == 0) | |
| 1992 return false; | |
| 1993 | |
| 1994 if (dir == dir_backward) | |
| 1995 { | |
| 1996 std::swap (osrc1, osrc2); | |
| 1997 std::swap (src1, src2); | |
| 1998 std::swap (e1, e2); | |
| 1999 std::swap (newpos1, newpos2); | |
| 2000 } | |
| 0 | 2001 |
| 2002 /* Don't proceed with the crossjump unless we found a sufficient number | |
| 2003 of matching instructions or the 'from' block was totally matched | |
| 2004 (such that its predecessors will hopefully be redirected and the | |
| 2005 block removed). */ | |
| 2006 if ((nmatch < PARAM_VALUE (PARAM_MIN_CROSSJUMP_INSNS)) | |
| 2007 && (newpos1 != BB_HEAD (src1))) | |
| 2008 return false; | |
| 2009 | |
| 2010 /* Avoid deleting preserve label when redirecting ABNORMAL edges. */ | |
| 2011 if (block_has_preserve_label (e1->dest) | |
| 2012 && (e1->flags & EDGE_ABNORMAL)) | |
| 2013 return false; | |
| 2014 | |
| 2015 /* Here we know that the insns in the end of SRC1 which are common with SRC2 | |
| 2016 will be deleted. | |
| 2017 If we have tablejumps in the end of SRC1 and SRC2 | |
| 2018 they have been already compared for equivalence in outgoing_edges_match () | |
| 2019 so replace the references to TABLE1 by references to TABLE2. */ | |
| 111 | 2020 { |
| 2021 rtx_insn *label1, *label2; | |
| 2022 rtx_jump_table_data *table1, *table2; | |
| 2023 | |
| 2024 if (tablejump_p (BB_END (osrc1), &label1, &table1) | |
| 2025 && tablejump_p (BB_END (osrc2), &label2, &table2) | |
| 0 | 2026 && label1 != label2) |
| 2027 { | |
| 111 | 2028 rtx_insn *insn; |
| 0 | 2029 |
| 2030 /* Replace references to LABEL1 with LABEL2. */ | |
| 2031 for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
| 2032 { | |
| 2033 /* Do not replace the label in SRC1->END because when deleting | |
| 2034 a block whose end is a tablejump, the tablejump referenced | |
| 2035 from the instruction is deleted too. */ | |
| 111 | 2036 if (insn != BB_END (osrc1)) |
| 2037 replace_label_in_insn (insn, label1, label2, true); | |
| 0 | 2038 } |
| 2039 } | |
| 111 | 2040 } |
| 0 | 2041 |
| 2042 /* Avoid splitting if possible. We must always split when SRC2 has | |
| 2043 EH predecessor edges, or we may end up with basic blocks with both | |
| 2044 normal and EH predecessor edges. */ | |
| 2045 if (newpos2 == BB_HEAD (src2) | |
| 2046 && !(EDGE_PRED (src2, 0)->flags & EDGE_EH)) | |
| 2047 redirect_to = src2; | |
| 2048 else | |
| 2049 { | |
| 2050 if (newpos2 == BB_HEAD (src2)) | |
| 2051 { | |
| 2052 /* Skip possible basic block header. */ | |
| 2053 if (LABEL_P (newpos2)) | |
| 2054 newpos2 = NEXT_INSN (newpos2); | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2055 while (DEBUG_INSN_P (newpos2)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2056 newpos2 = NEXT_INSN (newpos2); |
| 0 | 2057 if (NOTE_P (newpos2)) |
| 2058 newpos2 = NEXT_INSN (newpos2); | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2059 while (DEBUG_INSN_P (newpos2)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2060 newpos2 = NEXT_INSN (newpos2); |
| 0 | 2061 } |
| 2062 | |
| 2063 if (dump_file) | |
| 2064 fprintf (dump_file, "Splitting bb %i before %i insns\n", | |
| 2065 src2->index, nmatch); | |
| 2066 redirect_to = split_block (src2, PREV_INSN (newpos2))->dest; | |
| 2067 } | |
| 2068 | |
| 2069 if (dump_file) | |
| 2070 fprintf (dump_file, | |
| 2071 "Cross jumping from bb %i to bb %i; %i common insns\n", | |
| 2072 src1->index, src2->index, nmatch); | |
| 2073 | |
| 2074 /* We may have some registers visible through the block. */ | |
| 2075 df_set_bb_dirty (redirect_to); | |
| 2076 | |
| 111 | 2077 if (osrc2 == src2) |
| 2078 redirect_edges_to = redirect_to; | |
| 2079 else | |
| 2080 redirect_edges_to = osrc2; | |
| 2081 | |
| 131 | 2082 /* Recompute the counts of destinations of outgoing edges. */ |
| 111 | 2083 FOR_EACH_EDGE (s, ei, redirect_edges_to->succs) |
| 0 | 2084 { |
| 2085 edge s2; | |
| 2086 edge_iterator ei; | |
| 2087 basic_block d = s->dest; | |
| 2088 | |
| 2089 if (FORWARDER_BLOCK_P (d)) | |
| 2090 d = single_succ (d); | |
| 2091 | |
| 2092 FOR_EACH_EDGE (s2, ei, src1->succs) | |
| 2093 { | |
| 2094 basic_block d2 = s2->dest; | |
| 2095 if (FORWARDER_BLOCK_P (d2)) | |
| 2096 d2 = single_succ (d2); | |
| 2097 if (d == d2) | |
| 2098 break; | |
| 2099 } | |
| 2100 | |
| 2101 /* Take care to update possible forwarder blocks. We verified | |
| 2102 that there is no more than one in the chain, so we can't run | |
| 2103 into infinite loop. */ | |
| 2104 if (FORWARDER_BLOCK_P (s->dest)) | |
| 131 | 2105 s->dest->count += s->count (); |
| 0 | 2106 |
| 2107 if (FORWARDER_BLOCK_P (s2->dest)) | |
| 131 | 2108 s2->dest->count -= s->count (); |
| 2109 | |
| 2110 s->probability = s->probability.combine_with_count | |
| 2111 (redirect_edges_to->count, | |
| 2112 s2->probability, src1->count); | |
| 0 | 2113 } |
| 2114 | |
| 131 | 2115 /* Adjust count for the block. An earlier jump |
| 0 | 2116 threading pass may have left the profile in an inconsistent |
| 2117 state (see update_bb_profile_for_threading) so we must be | |
| 2118 prepared for overflows. */ | |
| 111 | 2119 tmp = redirect_to; |
| 2120 do | |
| 2121 { | |
| 2122 tmp->count += src1->count; | |
| 2123 if (tmp == redirect_edges_to) | |
| 2124 break; | |
| 2125 tmp = find_fallthru_edge (tmp->succs)->dest; | |
| 2126 } | |
| 2127 while (true); | |
| 2128 update_br_prob_note (redirect_edges_to); | |
| 0 | 2129 |
| 2130 /* Edit SRC1 to go to REDIRECT_TO at NEWPOS1. */ | |
| 2131 | |
| 2132 /* Skip possible basic block header. */ | |
| 2133 if (LABEL_P (newpos1)) | |
| 2134 newpos1 = NEXT_INSN (newpos1); | |
| 2135 | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2136 while (DEBUG_INSN_P (newpos1)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2137 newpos1 = NEXT_INSN (newpos1); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2138 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2139 if (NOTE_INSN_BASIC_BLOCK_P (newpos1)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2140 newpos1 = NEXT_INSN (newpos1); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2141 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2142 while (DEBUG_INSN_P (newpos1)) |
| 0 | 2143 newpos1 = NEXT_INSN (newpos1); |
| 2144 | |
| 2145 redirect_from = split_block (src1, PREV_INSN (newpos1))->src; | |
| 2146 to_remove = single_succ (redirect_from); | |
| 2147 | |
| 2148 redirect_edge_and_branch_force (single_succ_edge (redirect_from), redirect_to); | |
| 2149 delete_basic_block (to_remove); | |
| 2150 | |
| 2151 update_forwarder_flag (redirect_from); | |
| 2152 if (redirect_to != src2) | |
| 2153 update_forwarder_flag (src2); | |
| 2154 | |
| 2155 return true; | |
| 2156 } | |
| 2157 | |
| 2158 /* Search the predecessors of BB for common insn sequences. When found, | |
| 2159 share code between them by redirecting control flow. Return true if | |
| 2160 any changes made. */ | |
| 2161 | |
| 2162 static bool | |
| 2163 try_crossjump_bb (int mode, basic_block bb) | |
| 2164 { | |
| 2165 edge e, e2, fallthru; | |
| 2166 bool changed; | |
| 2167 unsigned max, ix, ix2; | |
| 2168 | |
| 2169 /* Nothing to do if there is not at least two incoming edges. */ | |
| 2170 if (EDGE_COUNT (bb->preds) < 2) | |
| 2171 return false; | |
| 2172 | |
| 2173 /* Don't crossjump if this block ends in a computed jump, | |
| 2174 unless we are optimizing for size. */ | |
| 2175 if (optimize_bb_for_size_p (bb) | |
| 111 | 2176 && bb != EXIT_BLOCK_PTR_FOR_FN (cfun) |
| 0 | 2177 && computed_jump_p (BB_END (bb))) |
| 2178 return false; | |
| 2179 | |
| 2180 /* If we are partitioning hot/cold basic blocks, we don't want to | |
| 2181 mess up unconditional or indirect jumps that cross between hot | |
| 2182 and cold sections. | |
| 2183 | |
| 2184 Basic block partitioning may result in some jumps that appear to | |
| 2185 be optimizable (or blocks that appear to be mergeable), but which really | |
| 2186 must be left untouched (they are required to make it safely across | |
| 2187 partition boundaries). See the comments at the top of | |
| 2188 bb-reorder.c:partition_hot_cold_basic_blocks for complete details. */ | |
| 2189 | |
| 2190 if (BB_PARTITION (EDGE_PRED (bb, 0)->src) != | |
| 2191 BB_PARTITION (EDGE_PRED (bb, 1)->src) | |
| 2192 || (EDGE_PRED (bb, 0)->flags & EDGE_CROSSING)) | |
| 2193 return false; | |
| 2194 | |
| 2195 /* It is always cheapest to redirect a block that ends in a branch to | |
| 2196 a block that falls through into BB, as that adds no branches to the | |
| 2197 program. We'll try that combination first. */ | |
| 2198 fallthru = NULL; | |
| 2199 max = PARAM_VALUE (PARAM_MAX_CROSSJUMP_EDGES); | |
| 2200 | |
| 2201 if (EDGE_COUNT (bb->preds) > max) | |
| 2202 return false; | |
| 2203 | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2204 fallthru = find_fallthru_edge (bb->preds); |
| 0 | 2205 |
| 2206 changed = false; | |
| 111 | 2207 for (ix = 0; ix < EDGE_COUNT (bb->preds);) |
| 0 | 2208 { |
| 111 | 2209 e = EDGE_PRED (bb, ix); |
| 0 | 2210 ix++; |
| 2211 | |
| 2212 /* As noted above, first try with the fallthru predecessor (or, a | |
| 2213 fallthru predecessor if we are in cfglayout mode). */ | |
| 2214 if (fallthru) | |
| 2215 { | |
| 2216 /* Don't combine the fallthru edge into anything else. | |
| 2217 If there is a match, we'll do it the other way around. */ | |
| 2218 if (e == fallthru) | |
| 2219 continue; | |
| 2220 /* If nothing changed since the last attempt, there is nothing | |
| 2221 we can do. */ | |
| 2222 if (!first_pass | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2223 && !((e->src->flags & BB_MODIFIED) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2224 || (fallthru->src->flags & BB_MODIFIED))) |
| 0 | 2225 continue; |
| 2226 | |
| 111 | 2227 if (try_crossjump_to_edge (mode, e, fallthru, dir_forward)) |
| 0 | 2228 { |
| 2229 changed = true; | |
| 2230 ix = 0; | |
| 2231 continue; | |
| 2232 } | |
| 2233 } | |
| 2234 | |
| 2235 /* Non-obvious work limiting check: Recognize that we're going | |
| 2236 to call try_crossjump_bb on every basic block. So if we have | |
| 2237 two blocks with lots of outgoing edges (a switch) and they | |
| 2238 share lots of common destinations, then we would do the | |
| 2239 cross-jump check once for each common destination. | |
| 2240 | |
| 2241 Now, if the blocks actually are cross-jump candidates, then | |
| 2242 all of their destinations will be shared. Which means that | |
| 2243 we only need check them for cross-jump candidacy once. We | |
| 2244 can eliminate redundant checks of crossjump(A,B) by arbitrarily | |
| 2245 choosing to do the check from the block for which the edge | |
| 2246 in question is the first successor of A. */ | |
| 2247 if (EDGE_SUCC (e->src, 0) != e) | |
| 2248 continue; | |
| 2249 | |
| 111 | 2250 for (ix2 = 0; ix2 < EDGE_COUNT (bb->preds); ix2++) |
| 0 | 2251 { |
| 111 | 2252 e2 = EDGE_PRED (bb, ix2); |
| 0 | 2253 |
| 2254 if (e2 == e) | |
| 2255 continue; | |
| 2256 | |
| 2257 /* We've already checked the fallthru edge above. */ | |
| 2258 if (e2 == fallthru) | |
| 2259 continue; | |
| 2260 | |
| 2261 /* The "first successor" check above only prevents multiple | |
| 2262 checks of crossjump(A,B). In order to prevent redundant | |
| 2263 checks of crossjump(B,A), require that A be the block | |
| 2264 with the lowest index. */ | |
| 2265 if (e->src->index > e2->src->index) | |
| 2266 continue; | |
| 2267 | |
| 2268 /* If nothing changed since the last attempt, there is nothing | |
| 2269 we can do. */ | |
| 2270 if (!first_pass | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2271 && !((e->src->flags & BB_MODIFIED) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2272 || (e2->src->flags & BB_MODIFIED))) |
| 0 | 2273 continue; |
| 2274 | |
| 111 | 2275 /* Both e and e2 are not fallthru edges, so we can crossjump in either |
| 2276 direction. */ | |
| 2277 if (try_crossjump_to_edge (mode, e, e2, dir_both)) | |
| 0 | 2278 { |
| 2279 changed = true; | |
| 2280 ix = 0; | |
| 2281 break; | |
| 2282 } | |
| 2283 } | |
| 2284 } | |
| 2285 | |
| 2286 if (changed) | |
| 111 | 2287 crossjumps_occurred = true; |
| 0 | 2288 |
| 2289 return changed; | |
| 2290 } | |
| 2291 | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2292 /* Search the successors of BB for common insn sequences. When found, |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2293 share code between them by moving it across the basic block |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2294 boundary. Return true if any changes made. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2295 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2296 static bool |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2297 try_head_merge_bb (basic_block bb) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2298 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2299 basic_block final_dest_bb = NULL; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2300 int max_match = INT_MAX; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2301 edge e0; |
| 111 | 2302 rtx_insn **headptr, **currptr, **nextptr; |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2303 bool changed, moveall; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2304 unsigned ix; |
| 111 | 2305 rtx_insn *e0_last_head; |
| 2306 rtx cond; | |
| 2307 rtx_insn *move_before; | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2308 unsigned nedges = EDGE_COUNT (bb->succs); |
| 111 | 2309 rtx_insn *jump = BB_END (bb); |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2310 regset live, live_union; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2311 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2312 /* Nothing to do if there is not at least two outgoing edges. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2313 if (nedges < 2) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2314 return false; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2315 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2316 /* Don't crossjump if this block ends in a computed jump, |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2317 unless we are optimizing for size. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2318 if (optimize_bb_for_size_p (bb) |
| 111 | 2319 && bb != EXIT_BLOCK_PTR_FOR_FN (cfun) |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2320 && computed_jump_p (BB_END (bb))) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2321 return false; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2322 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2323 cond = get_condition (jump, &move_before, true, false); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2324 if (cond == NULL_RTX) |
| 111 | 2325 { |
| 2326 if (HAVE_cc0 && reg_mentioned_p (cc0_rtx, jump)) | |
| 2327 move_before = prev_nonnote_nondebug_insn (jump); | |
| 2328 else | |
| 2329 move_before = jump; | |
| 2330 } | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2331 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2332 for (ix = 0; ix < nedges; ix++) |
| 111 | 2333 if (EDGE_SUCC (bb, ix)->dest == EXIT_BLOCK_PTR_FOR_FN (cfun)) |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2334 return false; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2335 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2336 for (ix = 0; ix < nedges; ix++) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2337 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2338 edge e = EDGE_SUCC (bb, ix); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2339 basic_block other_bb = e->dest; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2340 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2341 if (df_get_bb_dirty (other_bb)) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2342 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2343 block_was_dirty = true; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2344 return false; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2345 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2346 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2347 if (e->flags & EDGE_ABNORMAL) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2348 return false; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2349 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2350 /* Normally, all destination blocks must only be reachable from this |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2351 block, i.e. they must have one incoming edge. |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2352 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2353 There is one special case we can handle, that of multiple consecutive |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2354 jumps where the first jumps to one of the targets of the second jump. |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2355 This happens frequently in switch statements for default labels. |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2356 The structure is as follows: |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2357 FINAL_DEST_BB |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2358 .... |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2359 if (cond) jump A; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2360 fall through |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2361 BB |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2362 jump with targets A, B, C, D... |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2363 A |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2364 has two incoming edges, from FINAL_DEST_BB and BB |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2365 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2366 In this case, we can try to move the insns through BB and into |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2367 FINAL_DEST_BB. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2368 if (EDGE_COUNT (other_bb->preds) != 1) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2369 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2370 edge incoming_edge, incoming_bb_other_edge; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2371 edge_iterator ei; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2372 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2373 if (final_dest_bb != NULL |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2374 || EDGE_COUNT (other_bb->preds) != 2) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2375 return false; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2376 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2377 /* We must be able to move the insns across the whole block. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2378 move_before = BB_HEAD (bb); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2379 while (!NONDEBUG_INSN_P (move_before)) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2380 move_before = NEXT_INSN (move_before); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2381 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2382 if (EDGE_COUNT (bb->preds) != 1) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2383 return false; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2384 incoming_edge = EDGE_PRED (bb, 0); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2385 final_dest_bb = incoming_edge->src; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2386 if (EDGE_COUNT (final_dest_bb->succs) != 2) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2387 return false; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2388 FOR_EACH_EDGE (incoming_bb_other_edge, ei, final_dest_bb->succs) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2389 if (incoming_bb_other_edge != incoming_edge) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2390 break; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2391 if (incoming_bb_other_edge->dest != other_bb) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2392 return false; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2393 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2394 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2395 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2396 e0 = EDGE_SUCC (bb, 0); |
| 111 | 2397 e0_last_head = NULL; |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2398 changed = false; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2399 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2400 for (ix = 1; ix < nedges; ix++) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2401 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2402 edge e = EDGE_SUCC (bb, ix); |
| 111 | 2403 rtx_insn *e0_last, *e_last; |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2404 int nmatch; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2405 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2406 nmatch = flow_find_head_matching_sequence (e0->dest, e->dest, |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2407 &e0_last, &e_last, 0); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2408 if (nmatch == 0) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2409 return false; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2410 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2411 if (nmatch < max_match) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2412 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2413 max_match = nmatch; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2414 e0_last_head = e0_last; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2415 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2416 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2417 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2418 /* If we matched an entire block, we probably have to avoid moving the |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2419 last insn. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2420 if (max_match > 0 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2421 && e0_last_head == BB_END (e0->dest) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2422 && (find_reg_note (e0_last_head, REG_EH_REGION, 0) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2423 || control_flow_insn_p (e0_last_head))) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2424 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2425 max_match--; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2426 if (max_match == 0) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2427 return false; |
| 131 | 2428 e0_last_head = prev_real_nondebug_insn (e0_last_head); |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2429 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2430 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2431 if (max_match == 0) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2432 return false; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2433 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2434 /* We must find a union of the live registers at each of the end points. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2435 live = BITMAP_ALLOC (NULL); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2436 live_union = BITMAP_ALLOC (NULL); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2437 |
| 111 | 2438 currptr = XNEWVEC (rtx_insn *, nedges); |
| 2439 headptr = XNEWVEC (rtx_insn *, nedges); | |
| 2440 nextptr = XNEWVEC (rtx_insn *, nedges); | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2441 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2442 for (ix = 0; ix < nedges; ix++) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2443 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2444 int j; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2445 basic_block merge_bb = EDGE_SUCC (bb, ix)->dest; |
| 111 | 2446 rtx_insn *head = BB_HEAD (merge_bb); |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2447 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2448 while (!NONDEBUG_INSN_P (head)) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2449 head = NEXT_INSN (head); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2450 headptr[ix] = head; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2451 currptr[ix] = head; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2452 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2453 /* Compute the end point and live information */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2454 for (j = 1; j < max_match; j++) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2455 do |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2456 head = NEXT_INSN (head); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2457 while (!NONDEBUG_INSN_P (head)); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2458 simulate_backwards_to_point (merge_bb, live, head); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2459 IOR_REG_SET (live_union, live); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2460 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2461 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2462 /* If we're moving across two blocks, verify the validity of the |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2463 first move, then adjust the target and let the loop below deal |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2464 with the final move. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2465 if (final_dest_bb != NULL) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2466 { |
| 111 | 2467 rtx_insn *move_upto; |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2468 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2469 moveall = can_move_insns_across (currptr[0], e0_last_head, move_before, |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2470 jump, e0->dest, live_union, |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2471 NULL, &move_upto); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2472 if (!moveall) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2473 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2474 if (move_upto == NULL_RTX) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2475 goto out; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2476 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2477 while (e0_last_head != move_upto) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2478 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2479 df_simulate_one_insn_backwards (e0->dest, e0_last_head, |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2480 live_union); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2481 e0_last_head = PREV_INSN (e0_last_head); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2482 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2483 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2484 if (e0_last_head == NULL_RTX) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2485 goto out; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2486 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2487 jump = BB_END (final_dest_bb); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2488 cond = get_condition (jump, &move_before, true, false); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2489 if (cond == NULL_RTX) |
| 111 | 2490 { |
| 2491 if (HAVE_cc0 && reg_mentioned_p (cc0_rtx, jump)) | |
| 2492 move_before = prev_nonnote_nondebug_insn (jump); | |
| 2493 else | |
| 2494 move_before = jump; | |
| 2495 } | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2496 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2497 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2498 do |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2499 { |
| 111 | 2500 rtx_insn *move_upto; |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2501 moveall = can_move_insns_across (currptr[0], e0_last_head, |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2502 move_before, jump, e0->dest, live_union, |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2503 NULL, &move_upto); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2504 if (!moveall && move_upto == NULL_RTX) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2505 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2506 if (jump == move_before) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2507 break; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2508 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2509 /* Try again, using a different insertion point. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2510 move_before = jump; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2511 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2512 /* Don't try moving before a cc0 user, as that may invalidate |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2513 the cc0. */ |
| 111 | 2514 if (HAVE_cc0 && reg_mentioned_p (cc0_rtx, jump)) |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2515 break; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2516 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2517 continue; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2518 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2519 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2520 if (final_dest_bb && !moveall) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2521 /* We haven't checked whether a partial move would be OK for the first |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2522 move, so we have to fail this case. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2523 break; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2524 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2525 changed = true; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2526 for (;;) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2527 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2528 if (currptr[0] == move_upto) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2529 break; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2530 for (ix = 0; ix < nedges; ix++) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2531 { |
| 111 | 2532 rtx_insn *curr = currptr[ix]; |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2533 do |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2534 curr = NEXT_INSN (curr); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2535 while (!NONDEBUG_INSN_P (curr)); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2536 currptr[ix] = curr; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2537 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2538 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2539 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2540 /* If we can't currently move all of the identical insns, remember |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2541 each insn after the range that we'll merge. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2542 if (!moveall) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2543 for (ix = 0; ix < nedges; ix++) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2544 { |
| 111 | 2545 rtx_insn *curr = currptr[ix]; |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2546 do |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2547 curr = NEXT_INSN (curr); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2548 while (!NONDEBUG_INSN_P (curr)); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2549 nextptr[ix] = curr; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2550 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2551 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2552 reorder_insns (headptr[0], currptr[0], PREV_INSN (move_before)); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2553 df_set_bb_dirty (EDGE_SUCC (bb, 0)->dest); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2554 if (final_dest_bb != NULL) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2555 df_set_bb_dirty (final_dest_bb); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2556 df_set_bb_dirty (bb); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2557 for (ix = 1; ix < nedges; ix++) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2558 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2559 df_set_bb_dirty (EDGE_SUCC (bb, ix)->dest); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2560 delete_insn_chain (headptr[ix], currptr[ix], false); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2561 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2562 if (!moveall) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2563 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2564 if (jump == move_before) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2565 break; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2566 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2567 /* For the unmerged insns, try a different insertion point. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2568 move_before = jump; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2569 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2570 /* Don't try moving before a cc0 user, as that may invalidate |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2571 the cc0. */ |
| 111 | 2572 if (HAVE_cc0 && reg_mentioned_p (cc0_rtx, jump)) |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2573 break; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2574 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2575 for (ix = 0; ix < nedges; ix++) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2576 currptr[ix] = headptr[ix] = nextptr[ix]; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2577 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2578 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2579 while (!moveall); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2580 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2581 out: |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2582 free (currptr); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2583 free (headptr); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2584 free (nextptr); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2585 |
| 111 | 2586 crossjumps_occurred |= changed; |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2587 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2588 return changed; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2589 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2590 |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2591 /* Return true if BB contains just bb note, or bb note followed |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2592 by only DEBUG_INSNs. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2593 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2594 static bool |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2595 trivially_empty_bb_p (basic_block bb) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2596 { |
| 111 | 2597 rtx_insn *insn = BB_END (bb); |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2598 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2599 while (1) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2600 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2601 if (insn == BB_HEAD (bb)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2602 return true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2603 if (!DEBUG_INSN_P (insn)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2604 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2605 insn = PREV_INSN (insn); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2606 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2607 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2608 |
| 111 | 2609 /* Return true if BB contains just a return and possibly a USE of the |
| 2610 return value. Fill in *RET and *USE with the return and use insns | |
| 2611 if any found, otherwise NULL. All CLOBBERs are ignored. */ | |
| 2612 | |
| 2613 static bool | |
| 2614 bb_is_just_return (basic_block bb, rtx_insn **ret, rtx_insn **use) | |
| 2615 { | |
| 2616 *ret = *use = NULL; | |
| 2617 rtx_insn *insn; | |
| 2618 | |
| 2619 if (bb == EXIT_BLOCK_PTR_FOR_FN (cfun)) | |
| 2620 return false; | |
| 2621 | |
| 2622 FOR_BB_INSNS (bb, insn) | |
| 2623 if (NONDEBUG_INSN_P (insn)) | |
| 2624 { | |
| 2625 rtx pat = PATTERN (insn); | |
| 2626 | |
| 2627 if (!*ret && ANY_RETURN_P (pat)) | |
| 2628 *ret = insn; | |
| 2629 else if (!*ret && !*use && GET_CODE (pat) == USE | |
| 2630 && REG_P (XEXP (pat, 0)) | |
| 2631 && REG_FUNCTION_VALUE_P (XEXP (pat, 0))) | |
| 2632 *use = insn; | |
| 2633 else if (GET_CODE (pat) != CLOBBER) | |
| 2634 return false; | |
| 2635 } | |
| 2636 | |
| 2637 return !!*ret; | |
| 2638 } | |
| 2639 | |
| 0 | 2640 /* Do simple CFG optimizations - basic block merging, simplifying of jump |
| 2641 instructions etc. Return nonzero if changes were made. */ | |
| 2642 | |
| 2643 static bool | |
| 2644 try_optimize_cfg (int mode) | |
| 2645 { | |
| 2646 bool changed_overall = false; | |
| 2647 bool changed; | |
| 2648 int iterations = 0; | |
| 2649 basic_block bb, b, next; | |
| 2650 | |
| 2651 if (mode & (CLEANUP_CROSSJUMP | CLEANUP_THREADING)) | |
| 2652 clear_bb_flags (); | |
| 2653 | |
| 111 | 2654 crossjumps_occurred = false; |
| 2655 | |
| 2656 FOR_EACH_BB_FN (bb, cfun) | |
| 0 | 2657 update_forwarder_flag (bb); |
| 2658 | |
| 2659 if (! targetm.cannot_modify_jumps_p ()) | |
| 2660 { | |
| 2661 first_pass = true; | |
| 2662 /* Attempt to merge blocks as made possible by edge removal. If | |
| 2663 a block has only one successor, and the successor has only | |
| 2664 one predecessor, they may be combined. */ | |
| 2665 do | |
| 2666 { | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2667 block_was_dirty = false; |
| 0 | 2668 changed = false; |
| 2669 iterations++; | |
| 2670 | |
| 2671 if (dump_file) | |
| 2672 fprintf (dump_file, | |
| 2673 "\n\ntry_optimize_cfg iteration %i\n\n", | |
| 2674 iterations); | |
| 2675 | |
| 111 | 2676 for (b = ENTRY_BLOCK_PTR_FOR_FN (cfun)->next_bb; b |
| 2677 != EXIT_BLOCK_PTR_FOR_FN (cfun);) | |
| 0 | 2678 { |
| 2679 basic_block c; | |
| 2680 edge s; | |
| 2681 bool changed_here = false; | |
| 2682 | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2683 /* Delete trivially dead basic blocks. This is either |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2684 blocks with no predecessors, or empty blocks with no |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2685 successors. However if the empty block with no |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2686 successors is the successor of the ENTRY_BLOCK, it is |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2687 kept. This ensures that the ENTRY_BLOCK will have a |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2688 successor which is a precondition for many RTL |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2689 passes. Empty blocks may result from expanding |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2690 __builtin_unreachable (). */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2691 if (EDGE_COUNT (b->preds) == 0 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2692 || (EDGE_COUNT (b->succs) == 0 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2693 && trivially_empty_bb_p (b) |
| 111 | 2694 && single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun))->dest |
| 2695 != b)) | |
| 0 | 2696 { |
| 2697 c = b->prev_bb; | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2698 if (EDGE_COUNT (b->preds) > 0) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2699 { |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2700 edge e; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2701 edge_iterator ei; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2702 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2703 if (current_ir_type () == IR_RTL_CFGLAYOUT) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2704 { |
| 111 | 2705 if (BB_FOOTER (b) |
| 2706 && BARRIER_P (BB_FOOTER (b))) | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2707 FOR_EACH_EDGE (e, ei, b->preds) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2708 if ((e->flags & EDGE_FALLTHRU) |
| 111 | 2709 && BB_FOOTER (e->src) == NULL) |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2710 { |
| 111 | 2711 if (BB_FOOTER (b)) |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2712 { |
| 111 | 2713 BB_FOOTER (e->src) = BB_FOOTER (b); |
| 2714 BB_FOOTER (b) = NULL; | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2715 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2716 else |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2717 { |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2718 start_sequence (); |
| 111 | 2719 BB_FOOTER (e->src) = emit_barrier (); |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2720 end_sequence (); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2721 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2722 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2723 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2724 else |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2725 { |
| 111 | 2726 rtx_insn *last = get_last_bb_insn (b); |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2727 if (last && BARRIER_P (last)) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2728 FOR_EACH_EDGE (e, ei, b->preds) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2729 if ((e->flags & EDGE_FALLTHRU)) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2730 emit_barrier_after (BB_END (e->src)); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2731 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2732 } |
| 0 | 2733 delete_basic_block (b); |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2734 changed = true; |
| 111 | 2735 /* Avoid trying to remove the exit block. */ |
| 2736 b = (c == ENTRY_BLOCK_PTR_FOR_FN (cfun) ? c->next_bb : c); | |
| 0 | 2737 continue; |
| 2738 } | |
| 2739 | |
| 2740 /* Remove code labels no longer used. */ | |
| 2741 if (single_pred_p (b) | |
| 2742 && (single_pred_edge (b)->flags & EDGE_FALLTHRU) | |
| 2743 && !(single_pred_edge (b)->flags & EDGE_COMPLEX) | |
| 2744 && LABEL_P (BB_HEAD (b)) | |
| 111 | 2745 && !LABEL_PRESERVE_P (BB_HEAD (b)) |
| 0 | 2746 /* If the previous block ends with a branch to this |
| 2747 block, we can't delete the label. Normally this | |
| 2748 is a condjump that is yet to be simplified, but | |
| 2749 if CASE_DROPS_THRU, this can be a tablejump with | |
| 2750 some element going to the same place as the | |
| 2751 default (fallthru). */ | |
| 111 | 2752 && (single_pred (b) == ENTRY_BLOCK_PTR_FOR_FN (cfun) |
| 0 | 2753 || !JUMP_P (BB_END (single_pred (b))) |
| 2754 || ! label_is_jump_target_p (BB_HEAD (b), | |
| 2755 BB_END (single_pred (b))))) | |
| 2756 { | |
| 111 | 2757 delete_insn (BB_HEAD (b)); |
| 0 | 2758 if (dump_file) |
| 2759 fprintf (dump_file, "Deleted label in block %i.\n", | |
| 2760 b->index); | |
| 2761 } | |
| 2762 | |
| 2763 /* If we fall through an empty block, we can remove it. */ | |
| 111 | 2764 if (!(mode & (CLEANUP_CFGLAYOUT | CLEANUP_NO_INSN_DEL)) |
| 0 | 2765 && single_pred_p (b) |
| 2766 && (single_pred_edge (b)->flags & EDGE_FALLTHRU) | |
| 2767 && !LABEL_P (BB_HEAD (b)) | |
| 2768 && FORWARDER_BLOCK_P (b) | |
| 2769 /* Note that forwarder_block_p true ensures that | |
| 2770 there is a successor for this block. */ | |
| 2771 && (single_succ_edge (b)->flags & EDGE_FALLTHRU) | |
| 111 | 2772 && n_basic_blocks_for_fn (cfun) > NUM_FIXED_BLOCKS + 1) |
| 0 | 2773 { |
| 2774 if (dump_file) | |
| 2775 fprintf (dump_file, | |
| 2776 "Deleting fallthru block %i.\n", | |
| 2777 b->index); | |
| 2778 | |
| 111 | 2779 c = ((b->prev_bb == ENTRY_BLOCK_PTR_FOR_FN (cfun)) |
| 2780 ? b->next_bb : b->prev_bb); | |
| 0 | 2781 redirect_edge_succ_nodup (single_pred_edge (b), |
| 2782 single_succ (b)); | |
| 2783 delete_basic_block (b); | |
| 2784 changed = true; | |
| 2785 b = c; | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2786 continue; |
| 0 | 2787 } |
| 2788 | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2789 /* Merge B with its single successor, if any. */ |
| 0 | 2790 if (single_succ_p (b) |
| 2791 && (s = single_succ_edge (b)) | |
| 2792 && !(s->flags & EDGE_COMPLEX) | |
| 111 | 2793 && (c = s->dest) != EXIT_BLOCK_PTR_FOR_FN (cfun) |
| 0 | 2794 && single_pred_p (c) |
| 2795 && b != c) | |
| 2796 { | |
| 2797 /* When not in cfg_layout mode use code aware of reordering | |
| 2798 INSN. This code possibly creates new basic blocks so it | |
| 2799 does not fit merge_blocks interface and is kept here in | |
| 2800 hope that it will become useless once more of compiler | |
| 2801 is transformed to use cfg_layout mode. */ | |
| 2802 | |
| 2803 if ((mode & CLEANUP_CFGLAYOUT) | |
| 2804 && can_merge_blocks_p (b, c)) | |
| 2805 { | |
| 2806 merge_blocks (b, c); | |
| 2807 update_forwarder_flag (b); | |
| 2808 changed_here = true; | |
| 2809 } | |
| 2810 else if (!(mode & CLEANUP_CFGLAYOUT) | |
| 2811 /* If the jump insn has side effects, | |
| 2812 we can't kill the edge. */ | |
| 2813 && (!JUMP_P (BB_END (b)) | |
| 2814 || (reload_completed | |
| 2815 ? simplejump_p (BB_END (b)) | |
| 2816 : (onlyjump_p (BB_END (b)) | |
| 2817 && !tablejump_p (BB_END (b), | |
| 2818 NULL, NULL)))) | |
| 2819 && (next = merge_blocks_move (s, b, c, mode))) | |
| 2820 { | |
| 2821 b = next; | |
| 2822 changed_here = true; | |
| 2823 } | |
| 2824 } | |
| 2825 | |
| 111 | 2826 /* Try to change a branch to a return to just that return. */ |
| 2827 rtx_insn *ret, *use; | |
| 2828 if (single_succ_p (b) | |
| 2829 && onlyjump_p (BB_END (b)) | |
| 2830 && bb_is_just_return (single_succ (b), &ret, &use)) | |
| 2831 { | |
| 2832 if (redirect_jump (as_a <rtx_jump_insn *> (BB_END (b)), | |
| 2833 PATTERN (ret), 0)) | |
| 2834 { | |
| 2835 if (use) | |
| 2836 emit_insn_before (copy_insn (PATTERN (use)), | |
| 2837 BB_END (b)); | |
| 2838 if (dump_file) | |
| 2839 fprintf (dump_file, "Changed jump %d->%d to return.\n", | |
| 2840 b->index, single_succ (b)->index); | |
| 2841 redirect_edge_succ (single_succ_edge (b), | |
| 2842 EXIT_BLOCK_PTR_FOR_FN (cfun)); | |
| 2843 single_succ_edge (b)->flags &= ~EDGE_CROSSING; | |
| 2844 changed_here = true; | |
| 2845 } | |
| 2846 } | |
| 2847 | |
| 2848 /* Try to change a conditional branch to a return to the | |
| 2849 respective conditional return. */ | |
| 2850 if (EDGE_COUNT (b->succs) == 2 | |
| 2851 && any_condjump_p (BB_END (b)) | |
| 2852 && bb_is_just_return (BRANCH_EDGE (b)->dest, &ret, &use)) | |
| 2853 { | |
| 2854 if (redirect_jump (as_a <rtx_jump_insn *> (BB_END (b)), | |
| 2855 PATTERN (ret), 0)) | |
| 2856 { | |
| 2857 if (use) | |
| 2858 emit_insn_before (copy_insn (PATTERN (use)), | |
| 2859 BB_END (b)); | |
| 2860 if (dump_file) | |
| 2861 fprintf (dump_file, "Changed conditional jump %d->%d " | |
| 2862 "to conditional return.\n", | |
| 2863 b->index, BRANCH_EDGE (b)->dest->index); | |
| 2864 redirect_edge_succ (BRANCH_EDGE (b), | |
| 2865 EXIT_BLOCK_PTR_FOR_FN (cfun)); | |
| 2866 BRANCH_EDGE (b)->flags &= ~EDGE_CROSSING; | |
| 2867 changed_here = true; | |
| 2868 } | |
| 2869 } | |
| 2870 | |
| 2871 /* Try to flip a conditional branch that falls through to | |
| 2872 a return so that it becomes a conditional return and a | |
| 2873 new jump to the original branch target. */ | |
| 2874 if (EDGE_COUNT (b->succs) == 2 | |
| 2875 && BRANCH_EDGE (b)->dest != EXIT_BLOCK_PTR_FOR_FN (cfun) | |
| 2876 && any_condjump_p (BB_END (b)) | |
| 2877 && bb_is_just_return (FALLTHRU_EDGE (b)->dest, &ret, &use)) | |
| 2878 { | |
| 2879 if (invert_jump (as_a <rtx_jump_insn *> (BB_END (b)), | |
| 2880 JUMP_LABEL (BB_END (b)), 0)) | |
| 2881 { | |
| 2882 basic_block new_ft = BRANCH_EDGE (b)->dest; | |
| 2883 if (redirect_jump (as_a <rtx_jump_insn *> (BB_END (b)), | |
| 2884 PATTERN (ret), 0)) | |
| 2885 { | |
| 2886 if (use) | |
| 2887 emit_insn_before (copy_insn (PATTERN (use)), | |
| 2888 BB_END (b)); | |
| 2889 if (dump_file) | |
| 2890 fprintf (dump_file, "Changed conditional jump " | |
| 2891 "%d->%d to conditional return, adding " | |
| 2892 "fall-through jump.\n", | |
| 2893 b->index, BRANCH_EDGE (b)->dest->index); | |
| 2894 redirect_edge_succ (BRANCH_EDGE (b), | |
| 2895 EXIT_BLOCK_PTR_FOR_FN (cfun)); | |
| 2896 BRANCH_EDGE (b)->flags &= ~EDGE_CROSSING; | |
| 2897 std::swap (BRANCH_EDGE (b)->probability, | |
| 2898 FALLTHRU_EDGE (b)->probability); | |
| 2899 update_br_prob_note (b); | |
| 2900 basic_block jb = force_nonfallthru (FALLTHRU_EDGE (b)); | |
| 2901 notice_new_block (jb); | |
| 2902 if (!redirect_jump (as_a <rtx_jump_insn *> (BB_END (jb)), | |
| 2903 block_label (new_ft), 0)) | |
| 2904 gcc_unreachable (); | |
| 2905 redirect_edge_succ (single_succ_edge (jb), new_ft); | |
| 2906 changed_here = true; | |
| 2907 } | |
| 2908 else | |
| 2909 { | |
| 2910 /* Invert the jump back to what it was. This should | |
| 2911 never fail. */ | |
| 2912 if (!invert_jump (as_a <rtx_jump_insn *> (BB_END (b)), | |
| 2913 JUMP_LABEL (BB_END (b)), 0)) | |
| 2914 gcc_unreachable (); | |
| 2915 } | |
| 2916 } | |
| 2917 } | |
| 2918 | |
| 0 | 2919 /* Simplify branch over branch. */ |
| 2920 if ((mode & CLEANUP_EXPENSIVE) | |
| 2921 && !(mode & CLEANUP_CFGLAYOUT) | |
| 2922 && try_simplify_condjump (b)) | |
| 2923 changed_here = true; | |
| 2924 | |
| 2925 /* If B has a single outgoing edge, but uses a | |
| 2926 non-trivial jump instruction without side-effects, we | |
| 2927 can either delete the jump entirely, or replace it | |
| 2928 with a simple unconditional jump. */ | |
| 2929 if (single_succ_p (b) | |
| 111 | 2930 && single_succ (b) != EXIT_BLOCK_PTR_FOR_FN (cfun) |
| 0 | 2931 && onlyjump_p (BB_END (b)) |
| 111 | 2932 && !CROSSING_JUMP_P (BB_END (b)) |
| 0 | 2933 && try_redirect_by_replacing_jump (single_succ_edge (b), |
| 2934 single_succ (b), | |
| 2935 (mode & CLEANUP_CFGLAYOUT) != 0)) | |
| 2936 { | |
| 2937 update_forwarder_flag (b); | |
| 2938 changed_here = true; | |
| 2939 } | |
| 2940 | |
| 2941 /* Simplify branch to branch. */ | |
| 2942 if (try_forward_edges (mode, b)) | |
| 111 | 2943 { |
| 2944 update_forwarder_flag (b); | |
| 2945 changed_here = true; | |
| 2946 } | |
| 0 | 2947 |
| 2948 /* Look for shared code between blocks. */ | |
| 2949 if ((mode & CLEANUP_CROSSJUMP) | |
| 2950 && try_crossjump_bb (mode, b)) | |
| 2951 changed_here = true; | |
| 2952 | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2953 if ((mode & CLEANUP_CROSSJUMP) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2954 /* This can lengthen register lifetimes. Do it only after |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2955 reload. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2956 && reload_completed |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2957 && try_head_merge_bb (b)) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2958 changed_here = true; |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2959 |
| 0 | 2960 /* Don't get confused by the index shift caused by |
| 2961 deleting blocks. */ | |
| 2962 if (!changed_here) | |
| 2963 b = b->next_bb; | |
| 2964 else | |
| 2965 changed = true; | |
| 2966 } | |
| 2967 | |
| 2968 if ((mode & CLEANUP_CROSSJUMP) | |
| 111 | 2969 && try_crossjump_bb (mode, EXIT_BLOCK_PTR_FOR_FN (cfun))) |
| 0 | 2970 changed = true; |
| 2971 | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2972 if (block_was_dirty) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2973 { |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2974 /* This should only be set by head-merging. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2975 gcc_assert (mode & CLEANUP_CROSSJUMP); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2976 df_analyze (); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2977 } |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2978 |
| 0 | 2979 if (changed) |
| 111 | 2980 { |
| 2981 /* Edge forwarding in particular can cause hot blocks previously | |
| 2982 reached by both hot and cold blocks to become dominated only | |
| 2983 by cold blocks. This will cause the verification below to fail, | |
| 2984 and lead to now cold code in the hot section. This is not easy | |
| 2985 to detect and fix during edge forwarding, and in some cases | |
| 2986 is only visible after newly unreachable blocks are deleted, | |
| 2987 which will be done in fixup_partitions. */ | |
| 131 | 2988 if ((mode & CLEANUP_NO_PARTITIONING) == 0) |
| 2989 { | |
| 2990 fixup_partitions (); | |
| 2991 checking_verify_flow_info (); | |
| 2992 } | |
| 111 | 2993 } |
| 0 | 2994 |
| 2995 changed_overall |= changed; | |
| 2996 first_pass = false; | |
| 2997 } | |
| 2998 while (changed); | |
| 2999 } | |
| 3000 | |
| 111 | 3001 FOR_ALL_BB_FN (b, cfun) |
| 0 | 3002 b->flags &= ~(BB_FORWARDER_BLOCK | BB_NONTHREADABLE_BLOCK); |
| 3003 | |
| 3004 return changed_overall; | |
| 3005 } | |
| 3006 | |
| 3007 /* Delete all unreachable basic blocks. */ | |
| 3008 | |
| 3009 bool | |
| 3010 delete_unreachable_blocks (void) | |
| 3011 { | |
| 3012 bool changed = false; | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3013 basic_block b, prev_bb; |
| 0 | 3014 |
| 3015 find_unreachable_blocks (); | |
| 3016 | |
| 131 | 3017 /* When we're in GIMPLE mode and there may be debug bind insns, we |
| 3018 should delete blocks in reverse dominator order, so as to get a | |
| 3019 chance to substitute all released DEFs into debug bind stmts. If | |
| 3020 we don't have dominators information, walking blocks backward | |
| 3021 gets us a better chance of retaining most debug information than | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3022 otherwise. */ |
| 131 | 3023 if (MAY_HAVE_DEBUG_BIND_INSNS && current_ir_type () == IR_GIMPLE |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3024 && dom_info_available_p (CDI_DOMINATORS)) |
| 0 | 3025 { |
| 111 | 3026 for (b = EXIT_BLOCK_PTR_FOR_FN (cfun)->prev_bb; |
| 3027 b != ENTRY_BLOCK_PTR_FOR_FN (cfun); b = prev_bb) | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3028 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3029 prev_bb = b->prev_bb; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3030 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3031 if (!(b->flags & BB_REACHABLE)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3032 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3033 /* Speed up the removal of blocks that don't dominate |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3034 others. Walking backwards, this should be the common |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3035 case. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3036 if (!first_dom_son (CDI_DOMINATORS, b)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3037 delete_basic_block (b); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3038 else |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3039 { |
| 111 | 3040 vec<basic_block> h |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3041 = get_all_dominated_blocks (CDI_DOMINATORS, b); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3042 |
| 111 | 3043 while (h.length ()) |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3044 { |
| 111 | 3045 b = h.pop (); |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3046 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3047 prev_bb = b->prev_bb; |
| 0 | 3048 |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3049 gcc_assert (!(b->flags & BB_REACHABLE)); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3050 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3051 delete_basic_block (b); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3052 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3053 |
| 111 | 3054 h.release (); |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3055 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3056 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3057 changed = true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3058 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3059 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3060 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3061 else |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3062 { |
| 111 | 3063 for (b = EXIT_BLOCK_PTR_FOR_FN (cfun)->prev_bb; |
| 3064 b != ENTRY_BLOCK_PTR_FOR_FN (cfun); b = prev_bb) | |
| 0 | 3065 { |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3066 prev_bb = b->prev_bb; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3067 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3068 if (!(b->flags & BB_REACHABLE)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3069 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3070 delete_basic_block (b); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3071 changed = true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3072 } |
| 0 | 3073 } |
| 3074 } | |
| 3075 | |
| 3076 if (changed) | |
| 3077 tidy_fallthru_edges (); | |
| 3078 return changed; | |
| 3079 } | |
| 3080 | |
| 3081 /* Delete any jump tables never referenced. We can't delete them at the | |
| 3082 time of removing tablejump insn as they are referenced by the preceding | |
| 3083 insns computing the destination, so we delay deleting and garbagecollect | |
| 3084 them once life information is computed. */ | |
| 3085 void | |
| 3086 delete_dead_jumptables (void) | |
| 3087 { | |
| 3088 basic_block bb; | |
| 3089 | |
| 3090 /* A dead jump table does not belong to any basic block. Scan insns | |
| 3091 between two adjacent basic blocks. */ | |
| 111 | 3092 FOR_EACH_BB_FN (bb, cfun) |
| 0 | 3093 { |
| 111 | 3094 rtx_insn *insn, *next; |
| 0 | 3095 |
| 3096 for (insn = NEXT_INSN (BB_END (bb)); | |
| 3097 insn && !NOTE_INSN_BASIC_BLOCK_P (insn); | |
| 3098 insn = next) | |
| 3099 { | |
| 3100 next = NEXT_INSN (insn); | |
| 3101 if (LABEL_P (insn) | |
| 3102 && LABEL_NUSES (insn) == LABEL_PRESERVE_P (insn) | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3103 && JUMP_TABLE_DATA_P (next)) |
| 0 | 3104 { |
| 111 | 3105 rtx_insn *label = insn, *jump = next; |
| 0 | 3106 |
| 3107 if (dump_file) | |
| 3108 fprintf (dump_file, "Dead jumptable %i removed\n", | |
| 3109 INSN_UID (insn)); | |
| 3110 | |
| 3111 next = NEXT_INSN (next); | |
| 3112 delete_insn (jump); | |
| 3113 delete_insn (label); | |
| 3114 } | |
| 3115 } | |
| 3116 } | |
| 3117 } | |
| 3118 | |
| 3119 | |
| 3120 /* Tidy the CFG by deleting unreachable code and whatnot. */ | |
| 3121 | |
| 3122 bool | |
| 3123 cleanup_cfg (int mode) | |
| 3124 { | |
| 3125 bool changed = false; | |
| 3126 | |
| 3127 /* Set the cfglayout mode flag here. We could update all the callers | |
| 3128 but that is just inconvenient, especially given that we eventually | |
| 3129 want to have cfglayout mode as the default. */ | |
| 3130 if (current_ir_type () == IR_RTL_CFGLAYOUT) | |
| 3131 mode |= CLEANUP_CFGLAYOUT; | |
| 3132 | |
| 3133 timevar_push (TV_CLEANUP_CFG); | |
| 3134 if (delete_unreachable_blocks ()) | |
| 3135 { | |
| 3136 changed = true; | |
| 3137 /* We've possibly created trivially dead code. Cleanup it right | |
| 3138 now to introduce more opportunities for try_optimize_cfg. */ | |
| 3139 if (!(mode & (CLEANUP_NO_INSN_DEL)) | |
| 3140 && !reload_completed) | |
| 3141 delete_trivially_dead_insns (get_insns (), max_reg_num ()); | |
| 3142 } | |
| 3143 | |
| 3144 compact_blocks (); | |
| 3145 | |
| 3146 /* To tail-merge blocks ending in the same noreturn function (e.g. | |
| 3147 a call to abort) we have to insert fake edges to exit. Do this | |
| 3148 here once. The fake edges do not interfere with any other CFG | |
| 3149 cleanups. */ | |
| 3150 if (mode & CLEANUP_CROSSJUMP) | |
| 3151 add_noreturn_fake_exit_edges (); | |
| 3152 | |
| 3153 if (!dbg_cnt (cfg_cleanup)) | |
| 3154 return changed; | |
| 3155 | |
| 3156 while (try_optimize_cfg (mode)) | |
| 3157 { | |
| 3158 delete_unreachable_blocks (), changed = true; | |
| 3159 if (!(mode & CLEANUP_NO_INSN_DEL)) | |
| 3160 { | |
| 3161 /* Try to remove some trivially dead insns when doing an expensive | |
| 3162 cleanup. But delete_trivially_dead_insns doesn't work after | |
| 3163 reload (it only handles pseudos) and run_fast_dce is too costly | |
| 3164 to run in every iteration. | |
| 3165 | |
| 3166 For effective cross jumping, we really want to run a fast DCE to | |
| 3167 clean up any dead conditions, or they get in the way of performing | |
| 3168 useful tail merges. | |
| 3169 | |
| 3170 Other transformations in cleanup_cfg are not so sensitive to dead | |
| 3171 code, so delete_trivially_dead_insns or even doing nothing at all | |
| 3172 is good enough. */ | |
| 3173 if ((mode & CLEANUP_EXPENSIVE) && !reload_completed | |
| 3174 && !delete_trivially_dead_insns (get_insns (), max_reg_num ())) | |
| 3175 break; | |
| 111 | 3176 if ((mode & CLEANUP_CROSSJUMP) && crossjumps_occurred) |
| 0 | 3177 run_fast_dce (); |
| 3178 } | |
| 3179 else | |
| 3180 break; | |
| 3181 } | |
| 3182 | |
| 3183 if (mode & CLEANUP_CROSSJUMP) | |
| 3184 remove_fake_exit_edges (); | |
| 3185 | |
| 3186 /* Don't call delete_dead_jumptables in cfglayout mode, because | |
| 3187 that function assumes that jump tables are in the insns stream. | |
| 3188 But we also don't _have_ to delete dead jumptables in cfglayout | |
| 3189 mode because we shouldn't even be looking at things that are | |
| 3190 not in a basic block. Dead jumptables are cleaned up when | |
| 3191 going out of cfglayout mode. */ | |
| 3192 if (!(mode & CLEANUP_CFGLAYOUT)) | |
| 3193 delete_dead_jumptables (); | |
| 3194 | |
| 111 | 3195 /* ??? We probably do this way too often. */ |
| 3196 if (current_loops | |
| 3197 && (changed | |
| 3198 || (mode & CLEANUP_CFG_CHANGED))) | |
| 3199 { | |
| 3200 timevar_push (TV_REPAIR_LOOPS); | |
| 3201 /* The above doesn't preserve dominance info if available. */ | |
| 3202 gcc_assert (!dom_info_available_p (CDI_DOMINATORS)); | |
| 3203 calculate_dominance_info (CDI_DOMINATORS); | |
| 3204 fix_loop_structure (NULL); | |
| 3205 free_dominance_info (CDI_DOMINATORS); | |
| 3206 timevar_pop (TV_REPAIR_LOOPS); | |
| 3207 } | |
| 3208 | |
| 0 | 3209 timevar_pop (TV_CLEANUP_CFG); |
| 3210 | |
| 3211 return changed; | |
| 3212 } | |
| 3213 | |
| 111 | 3214 namespace { |
| 3215 | |
| 3216 const pass_data pass_data_jump = | |
| 0 | 3217 { |
| 111 | 3218 RTL_PASS, /* type */ |
| 3219 "jump", /* name */ | |
| 3220 OPTGROUP_NONE, /* optinfo_flags */ | |
| 3221 TV_JUMP, /* tv_id */ | |
| 3222 0, /* properties_required */ | |
| 3223 0, /* properties_provided */ | |
| 3224 0, /* properties_destroyed */ | |
| 3225 0, /* todo_flags_start */ | |
| 3226 0, /* todo_flags_finish */ | |
| 0 | 3227 }; |
| 3228 | |
| 111 | 3229 class pass_jump : public rtl_opt_pass |
| 3230 { | |
| 3231 public: | |
| 3232 pass_jump (gcc::context *ctxt) | |
| 3233 : rtl_opt_pass (pass_data_jump, ctxt) | |
| 3234 {} | |
| 3235 | |
| 3236 /* opt_pass methods: */ | |
| 3237 virtual unsigned int execute (function *); | |
| 3238 | |
| 3239 }; // class pass_jump | |
| 3240 | |
| 3241 unsigned int | |
| 3242 pass_jump::execute (function *) | |
| 0 | 3243 { |
| 3244 delete_trivially_dead_insns (get_insns (), max_reg_num ()); | |
| 3245 if (dump_file) | |
| 3246 dump_flow_info (dump_file, dump_flags); | |
| 3247 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | |
| 3248 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); | |
| 3249 return 0; | |
| 3250 } | |
| 3251 | |
| 111 | 3252 } // anon namespace |
| 3253 | |
| 3254 rtl_opt_pass * | |
| 3255 make_pass_jump (gcc::context *ctxt) | |
| 3256 { | |
| 3257 return new pass_jump (ctxt); | |
| 3258 } | |
| 3259 | |
| 3260 namespace { | |
| 3261 | |
| 3262 const pass_data pass_data_jump2 = | |
| 0 | 3263 { |
| 111 | 3264 RTL_PASS, /* type */ |
| 3265 "jump2", /* name */ | |
| 3266 OPTGROUP_NONE, /* optinfo_flags */ | |
| 3267 TV_JUMP, /* tv_id */ | |
| 3268 0, /* properties_required */ | |
| 3269 0, /* properties_provided */ | |
| 3270 0, /* properties_destroyed */ | |
| 3271 0, /* todo_flags_start */ | |
| 3272 0, /* todo_flags_finish */ | |
| 0 | 3273 }; |
| 3274 | |
| 111 | 3275 class pass_jump2 : public rtl_opt_pass |
| 3276 { | |
| 3277 public: | |
| 3278 pass_jump2 (gcc::context *ctxt) | |
| 3279 : rtl_opt_pass (pass_data_jump2, ctxt) | |
| 3280 {} | |
| 3281 | |
| 3282 /* opt_pass methods: */ | |
| 3283 virtual unsigned int execute (function *) | |
| 3284 { | |
| 3285 cleanup_cfg (flag_crossjumping ? CLEANUP_CROSSJUMP : 0); | |
| 3286 return 0; | |
| 3287 } | |
| 3288 | |
| 3289 }; // class pass_jump2 | |
| 3290 | |
| 3291 } // anon namespace | |
| 3292 | |
| 3293 rtl_opt_pass * | |
| 3294 make_pass_jump2 (gcc::context *ctxt) | |
| 3295 { | |
| 3296 return new pass_jump2 (ctxt); | |
| 3297 } |