gcc/tree-ssa-loop.c

   1 /* Loop optimizations over tree-ssa.
   2    Copyright (C) 2003-2018 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it
   7 under the terms of the GNU General Public License as published by the
   8 Free Software Foundation; either version 3, or (at your option) any
   9 later version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT
  12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 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 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "backend.h"
  24 #include "tree.h"
  25 #include "gimple.h"
  26 #include "tree-pass.h"
  27 #include "memmodel.h"
  28 #include "tm_p.h"
  29 #include "fold-const.h"
  30 #include "gimple-iterator.h"
  31 #include "tree-ssa-loop-ivopts.h"
  32 #include "tree-ssa-loop-manip.h"
  33 #include "tree-ssa-loop-niter.h"
  34 #include "tree-ssa-loop.h"
  35 #include "cfgloop.h"
  36 #include "tree-inline.h"
  37 #include "tree-scalar-evolution.h"
  38 #include "tree-vectorizer.h"
  39 #include "omp-general.h"
  40 #include "diagnostic-core.h"
  41 #include "stringpool.h"
  42 #include "attribs.h"
  43
  44
  45 /* A pass making sure loops are fixed up.  */
  46
  47 namespace {
  48
  49 const pass_data pass_data_fix_loops =
  50 {
  51   GIMPLE_PASS, /* type */
  52   "fix_loops", /* name */
  53   OPTGROUP_LOOP, /* optinfo_flags */
  54   TV_TREE_LOOP, /* tv_id */
  55   PROP_cfg, /* properties_required */
  56   0, /* properties_provided */
  57   0, /* properties_destroyed */
  58   0, /* todo_flags_start */
  59   0, /* todo_flags_finish */
  60 };
  61
  62 class pass_fix_loops : public gimple_opt_pass
  63 {
  64 public:
  65   pass_fix_loops (gcc::context *ctxt)
  66     : gimple_opt_pass (pass_data_fix_loops, ctxt)
  67   {}
  68
  69   /* opt_pass methods: */
  70   virtual bool gate (function *) { return flag_tree_loop_optimize; }
  71
  72   virtual unsigned int execute (function *fn);
  73 }; // class pass_fix_loops
  74
  75 unsigned int
  76 pass_fix_loops::execute (function *)
  77 {
  78   if (loops_state_satisfies_p (LOOPS_NEED_FIXUP))
  79     {
  80       calculate_dominance_info (CDI_DOMINATORS);
  81       fix_loop_structure (NULL);
  82     }
  83   return 0;
  84 }
  85
  86 } // anon namespace
  87
  88 gimple_opt_pass *
  89 make_pass_fix_loops (gcc::context *ctxt)
  90 {
  91   return new pass_fix_loops (ctxt);
  92 }
  93
  94
  95 /* Gate for loop pass group.  The group is controlled by -ftree-loop-optimize
  96    but we also avoid running it when the IL doesn't contain any loop.  */
  97
  98 static bool
  99 gate_loop (function *fn)
 100 {
 101   if (!flag_tree_loop_optimize)
 102     return false;
 103
 104   /* For -fdump-passes which runs before loop discovery print the
 105      state of -ftree-loop-optimize.  */
 106   if (!loops_for_fn (fn))
 107     return true;
 108
 109   return number_of_loops (fn) > 1;
 110 }
 111
 112 /* The loop superpass.  */
 113
 114 namespace {
 115
 116 const pass_data pass_data_tree_loop =
 117 {
 118   GIMPLE_PASS, /* type */
 119   "loop", /* name */
 120   OPTGROUP_LOOP, /* optinfo_flags */
 121   TV_TREE_LOOP, /* tv_id */
 122   PROP_cfg, /* properties_required */
 123   0, /* properties_provided */
 124   0, /* properties_destroyed */
 125   0, /* todo_flags_start */
 126   0, /* todo_flags_finish */
 127 };
 128
 129 class pass_tree_loop : public gimple_opt_pass
 130 {
 131 public:
 132   pass_tree_loop (gcc::context *ctxt)
 133     : gimple_opt_pass (pass_data_tree_loop, ctxt)
 134   {}
 135
 136   /* opt_pass methods: */
 137   virtual bool gate (function *fn) { return gate_loop (fn); }
 138
 139 }; // class pass_tree_loop
 140
 141 } // anon namespace
 142
 143 gimple_opt_pass *
 144 make_pass_tree_loop (gcc::context *ctxt)
 145 {
 146   return new pass_tree_loop (ctxt);
 147 }
 148
 149 /* Gate for oacc kernels pass group.  */
 150
 151 static bool
 152 gate_oacc_kernels (function *fn)
 153 {
 154   if (!flag_openacc)
 155     return false;
 156
 157   if (!lookup_attribute ("oacc kernels", DECL_ATTRIBUTES (fn->decl)))
 158     return false;
 159
 160   struct loop *loop;
 161   FOR_EACH_LOOP (loop, 0)
 162     if (loop->in_oacc_kernels_region)
 163       return true;
 164
 165   return false;
 166 }
 167
 168 /* The oacc kernels superpass.  */
 169
 170 namespace {
 171
 172 const pass_data pass_data_oacc_kernels =
 173 {
 174   GIMPLE_PASS, /* type */
 175   "oacc_kernels", /* name */
 176   OPTGROUP_LOOP, /* optinfo_flags */
 177   TV_TREE_LOOP, /* tv_id */
 178   PROP_cfg, /* properties_required */
 179   0, /* properties_provided */
 180   0, /* properties_destroyed */
 181   0, /* todo_flags_start */
 182   0, /* todo_flags_finish */
 183 };
 184
 185 class pass_oacc_kernels : public gimple_opt_pass
 186 {
 187 public:
 188   pass_oacc_kernels (gcc::context *ctxt)
 189     : gimple_opt_pass (pass_data_oacc_kernels, ctxt)
 190   {}
 191
 192   /* opt_pass methods: */
 193   virtual bool gate (function *fn) { return gate_oacc_kernels (fn); }
 194
 195 }; // class pass_oacc_kernels
 196
 197 } // anon namespace
 198
 199 gimple_opt_pass *
 200 make_pass_oacc_kernels (gcc::context *ctxt)
 201 {
 202   return new pass_oacc_kernels (ctxt);
 203 }
 204
 205 /* The ipa oacc superpass.  */
 206
 207 namespace {
 208
 209 const pass_data pass_data_ipa_oacc =
 210 {
 211   SIMPLE_IPA_PASS, /* type */
 212   "ipa_oacc", /* name */
 213   OPTGROUP_LOOP, /* optinfo_flags */
 214   TV_TREE_LOOP, /* tv_id */
 215   PROP_cfg, /* properties_required */
 216   0, /* properties_provided */
 217   0, /* properties_destroyed */
 218   0, /* todo_flags_start */
 219   0, /* todo_flags_finish */
 220 };
 221
 222 class pass_ipa_oacc : public simple_ipa_opt_pass
 223 {
 224 public:
 225   pass_ipa_oacc (gcc::context *ctxt)
 226     : simple_ipa_opt_pass (pass_data_ipa_oacc, ctxt)
 227   {}
 228
 229   /* opt_pass methods: */
 230   virtual bool gate (function *)
 231   {
 232     return (optimize
 233             && flag_openacc
 234             /* Don't bother doing anything if the program has errors.  */
 235             && !seen_error ());
 236   }
 237
 238 }; // class pass_ipa_oacc
 239
 240 } // anon namespace
 241
 242 simple_ipa_opt_pass *
 243 make_pass_ipa_oacc (gcc::context *ctxt)
 244 {
 245   return new pass_ipa_oacc (ctxt);
 246 }
 247
 248 /* The ipa oacc kernels pass.  */
 249
 250 namespace {
 251
 252 const pass_data pass_data_ipa_oacc_kernels =
 253 {
 254   SIMPLE_IPA_PASS, /* type */
 255   "ipa_oacc_kernels", /* name */
 256   OPTGROUP_LOOP, /* optinfo_flags */
 257   TV_TREE_LOOP, /* tv_id */
 258   PROP_cfg, /* properties_required */
 259   0, /* properties_provided */
 260   0, /* properties_destroyed */
 261   0, /* todo_flags_start */
 262   0, /* todo_flags_finish */
 263 };
 264
 265 class pass_ipa_oacc_kernels : public simple_ipa_opt_pass
 266 {
 267 public:
 268   pass_ipa_oacc_kernels (gcc::context *ctxt)
 269     : simple_ipa_opt_pass (pass_data_ipa_oacc_kernels, ctxt)
 270   {}
 271
 272 }; // class pass_ipa_oacc_kernels
 273
 274 } // anon namespace
 275
 276 simple_ipa_opt_pass *
 277 make_pass_ipa_oacc_kernels (gcc::context *ctxt)
 278 {
 279   return new pass_ipa_oacc_kernels (ctxt);
 280 }
 281
 282 /* The no-loop superpass.  */
 283
 284 namespace {
 285
 286 const pass_data pass_data_tree_no_loop =
 287 {
 288   GIMPLE_PASS, /* type */
 289   "no_loop", /* name */
 290   OPTGROUP_NONE, /* optinfo_flags */
 291   TV_TREE_NOLOOP, /* tv_id */
 292   PROP_cfg, /* properties_required */
 293   0, /* properties_provided */
 294   0, /* properties_destroyed */
 295   0, /* todo_flags_start */
 296   0, /* todo_flags_finish */
 297 };
 298
 299 class pass_tree_no_loop : public gimple_opt_pass
 300 {
 301 public:
 302   pass_tree_no_loop (gcc::context *ctxt)
 303     : gimple_opt_pass (pass_data_tree_no_loop, ctxt)
 304   {}
 305
 306   /* opt_pass methods: */
 307   virtual bool gate (function *fn) { return !gate_loop (fn); }
 308
 309 }; // class pass_tree_no_loop
 310
 311 } // anon namespace
 312
 313 gimple_opt_pass *
 314 make_pass_tree_no_loop (gcc::context *ctxt)
 315 {
 316   return new pass_tree_no_loop (ctxt);
 317 }
 318
 319
 320 /* Loop optimizer initialization.  */
 321
 322 namespace {
 323
 324 const pass_data pass_data_tree_loop_init =
 325 {
 326   GIMPLE_PASS, /* type */
 327   "loopinit", /* name */
 328   OPTGROUP_LOOP, /* optinfo_flags */
 329   TV_NONE, /* tv_id */
 330   PROP_cfg, /* properties_required */
 331   0, /* properties_provided */
 332   0, /* properties_destroyed */
 333   0, /* todo_flags_start */
 334   0, /* todo_flags_finish */
 335 };
 336
 337 class pass_tree_loop_init : public gimple_opt_pass
 338 {
 339 public:
 340   pass_tree_loop_init (gcc::context *ctxt)
 341     : gimple_opt_pass (pass_data_tree_loop_init, ctxt)
 342   {}
 343
 344   /* opt_pass methods: */
 345   virtual unsigned int execute (function *);
 346
 347 }; // class pass_tree_loop_init
 348
 349 unsigned int
 350 pass_tree_loop_init::execute (function *fun ATTRIBUTE_UNUSED)
 351 {
 352   /* When processing a loop in the loop pipeline, we should be able to assert
 353      that:
 354        (loops_state_satisfies_p (LOOPS_NORMAL | LOOPS_HAVE_RECORDED_EXITS
 355                                               | LOOP_CLOSED_SSA)
 356         && scev_initialized_p ())
 357   */
 358   loop_optimizer_init (LOOPS_NORMAL
 359                        | LOOPS_HAVE_RECORDED_EXITS);
 360   rewrite_into_loop_closed_ssa (NULL, TODO_update_ssa);
 361   scev_initialize ();
 362
 363   return 0;
 364 }
 365
 366 } // anon namespace
 367
 368 gimple_opt_pass *
 369 make_pass_tree_loop_init (gcc::context *ctxt)
 370 {
 371   return new pass_tree_loop_init (ctxt);
 372 }
 373
 374 /* Loop autovectorization.  */
 375
 376 namespace {
 377
 378 const pass_data pass_data_vectorize =
 379 {
 380   GIMPLE_PASS, /* type */
 381   "vect", /* name */
 382   OPTGROUP_LOOP | OPTGROUP_VEC, /* optinfo_flags */
 383   TV_TREE_VECTORIZATION, /* tv_id */
 384   ( PROP_cfg | PROP_ssa ), /* properties_required */
 385   0, /* properties_provided */
 386   0, /* properties_destroyed */
 387   0, /* todo_flags_start */
 388   0, /* todo_flags_finish */
 389 };
 390
 391 class pass_vectorize : public gimple_opt_pass
 392 {
 393 public:
 394   pass_vectorize (gcc::context *ctxt)
 395     : gimple_opt_pass (pass_data_vectorize, ctxt)
 396   {}
 397
 398   /* opt_pass methods: */
 399   virtual bool gate (function *fun)
 400     {
 401       return flag_tree_loop_vectorize || fun->has_force_vectorize_loops;
 402     }
 403
 404   virtual unsigned int execute (function *);
 405
 406 }; // class pass_vectorize
 407
 408 unsigned int
 409 pass_vectorize::execute (function *fun)
 410 {
 411   if (number_of_loops (fun) <= 1)
 412     return 0;
 413
 414   return vectorize_loops ();
 415 }
 416
 417 } // anon namespace
 418
 419 gimple_opt_pass *
 420 make_pass_vectorize (gcc::context *ctxt)
 421 {
 422   return new pass_vectorize (ctxt);
 423 }
 424
 425 /* Propagation of constants using scev.  */
 426
 427 namespace {
 428
 429 const pass_data pass_data_scev_cprop =
 430 {
 431   GIMPLE_PASS, /* type */
 432   "sccp", /* name */
 433   OPTGROUP_LOOP, /* optinfo_flags */
 434   TV_SCEV_CONST, /* tv_id */
 435   ( PROP_cfg | PROP_ssa ), /* properties_required */
 436   0, /* properties_provided */
 437   0, /* properties_destroyed */
 438   0, /* todo_flags_start */
 439   ( TODO_cleanup_cfg
 440     | TODO_update_ssa_only_virtuals ), /* todo_flags_finish */
 441 };
 442
 443 class pass_scev_cprop : public gimple_opt_pass
 444 {
 445 public:
 446   pass_scev_cprop (gcc::context *ctxt)
 447     : gimple_opt_pass (pass_data_scev_cprop, ctxt)
 448   {}
 449
 450   /* opt_pass methods: */
 451   virtual bool gate (function *) { return flag_tree_scev_cprop; }
 452   virtual unsigned int execute (function *) { return scev_const_prop (); }
 453
 454 }; // class pass_scev_cprop
 455
 456 } // anon namespace
 457
 458 gimple_opt_pass *
 459 make_pass_scev_cprop (gcc::context *ctxt)
 460 {
 461   return new pass_scev_cprop (ctxt);
 462 }
 463
 464 /* Induction variable optimizations.  */
 465
 466 namespace {
 467
 468 const pass_data pass_data_iv_optimize =
 469 {
 470   GIMPLE_PASS, /* type */
 471   "ivopts", /* name */
 472   OPTGROUP_LOOP, /* optinfo_flags */
 473   TV_TREE_LOOP_IVOPTS, /* tv_id */
 474   ( PROP_cfg | PROP_ssa ), /* properties_required */
 475   0, /* properties_provided */
 476   0, /* properties_destroyed */
 477   0, /* todo_flags_start */
 478   TODO_update_ssa, /* todo_flags_finish */
 479 };
 480
 481 class pass_iv_optimize : public gimple_opt_pass
 482 {
 483 public:
 484   pass_iv_optimize (gcc::context *ctxt)
 485     : gimple_opt_pass (pass_data_iv_optimize, ctxt)
 486   {}
 487
 488   /* opt_pass methods: */
 489   virtual bool gate (function *) { return flag_ivopts != 0; }
 490   virtual unsigned int execute (function *);
 491
 492 }; // class pass_iv_optimize
 493
 494 unsigned int
 495 pass_iv_optimize::execute (function *fun)
 496 {
 497   if (number_of_loops (fun) <= 1)
 498     return 0;
 499
 500   tree_ssa_iv_optimize ();
 501   return 0;
 502 }
 503
 504 } // anon namespace
 505
 506 gimple_opt_pass *
 507 make_pass_iv_optimize (gcc::context *ctxt)
 508 {
 509   return new pass_iv_optimize (ctxt);
 510 }
 511
 512 /* Loop optimizer finalization.  */
 513
 514 static unsigned int
 515 tree_ssa_loop_done (void)
 516 {
 517   free_numbers_of_iterations_estimates (cfun);
 518   scev_finalize ();
 519   loop_optimizer_finalize ();
 520   return 0;
 521 }
 522
 523 namespace {
 524
 525 const pass_data pass_data_tree_loop_done =
 526 {
 527   GIMPLE_PASS, /* type */
 528   "loopdone", /* name */
 529   OPTGROUP_LOOP, /* optinfo_flags */
 530   TV_NONE, /* tv_id */
 531   PROP_cfg, /* properties_required */
 532   0, /* properties_provided */
 533   0, /* properties_destroyed */
 534   0, /* todo_flags_start */
 535   TODO_cleanup_cfg, /* todo_flags_finish */
 536 };
 537
 538 class pass_tree_loop_done : public gimple_opt_pass
 539 {
 540 public:
 541   pass_tree_loop_done (gcc::context *ctxt)
 542     : gimple_opt_pass (pass_data_tree_loop_done, ctxt)
 543   {}
 544
 545   /* opt_pass methods: */
 546   virtual unsigned int execute (function *) { return tree_ssa_loop_done (); }
 547
 548 }; // class pass_tree_loop_done
 549
 550 } // anon namespace
 551
 552 gimple_opt_pass *
 553 make_pass_tree_loop_done (gcc::context *ctxt)
 554 {
 555   return new pass_tree_loop_done (ctxt);
 556 }
 557
 558 /* Calls CBCK for each index in memory reference ADDR_P.  There are two
 559    kinds situations handled; in each of these cases, the memory reference
 560    and DATA are passed to the callback:
 561
 562    Access to an array: ARRAY_{RANGE_}REF (base, index).  In this case we also
 563    pass the pointer to the index to the callback.
 564
 565    Pointer dereference: INDIRECT_REF (addr).  In this case we also pass the
 566    pointer to addr to the callback.
 567
 568    If the callback returns false, the whole search stops and false is returned.
 569    Otherwise the function returns true after traversing through the whole
 570    reference *ADDR_P.  */
 571
 572 bool
 573 for_each_index (tree *addr_p, bool (*cbck) (tree, tree *, void *), void *data)
 574 {
 575   tree *nxt, *idx;
 576
 577   for (; ; addr_p = nxt)
 578     {
 579       switch (TREE_CODE (*addr_p))
 580         {
 581         case SSA_NAME:
 582           return cbck (*addr_p, addr_p, data);
 583
 584         case MEM_REF:
 585           nxt = &TREE_OPERAND (*addr_p, 0);
 586           return cbck (*addr_p, nxt, data);
 587
 588         case BIT_FIELD_REF:
 589         case VIEW_CONVERT_EXPR:
 590         case REALPART_EXPR:
 591         case IMAGPART_EXPR:
 592           nxt = &TREE_OPERAND (*addr_p, 0);
 593           break;
 594
 595         case COMPONENT_REF:
 596           /* If the component has varying offset, it behaves like index
 597              as well.  */
 598           idx = &TREE_OPERAND (*addr_p, 2);
 599           if (*idx
 600               && !cbck (*addr_p, idx, data))
 601             return false;
 602
 603           nxt = &TREE_OPERAND (*addr_p, 0);
 604           break;
 605
 606         case ARRAY_REF:
 607         case ARRAY_RANGE_REF:
 608           nxt = &TREE_OPERAND (*addr_p, 0);
 609           if (!cbck (*addr_p, &TREE_OPERAND (*addr_p, 1), data))
 610             return false;
 611           break;
 612
 613         case CONSTRUCTOR:
 614           return true;
 615
 616         case ADDR_EXPR:
 617           gcc_assert (is_gimple_min_invariant (*addr_p));
 618           return true;
 619
 620         case TARGET_MEM_REF:
 621           idx = &TMR_BASE (*addr_p);
 622           if (*idx
 623               && !cbck (*addr_p, idx, data))
 624             return false;
 625           idx = &TMR_INDEX (*addr_p);
 626           if (*idx
 627               && !cbck (*addr_p, idx, data))
 628             return false;
 629           idx = &TMR_INDEX2 (*addr_p);
 630           if (*idx
 631               && !cbck (*addr_p, idx, data))
 632             return false;
 633           return true;
 634
 635         default:
 636           if (DECL_P (*addr_p)
 637               || CONSTANT_CLASS_P (*addr_p))
 638             return true;
 639           gcc_unreachable ();
 640         }
 641     }
 642 }
 643
 644
 645 /* The name and the length of the currently generated variable
 646    for lsm.  */
 647 #define MAX_LSM_NAME_LENGTH 40
 648 static char lsm_tmp_name[MAX_LSM_NAME_LENGTH + 1];
 649 static int lsm_tmp_name_length;
 650
 651 /* Adds S to lsm_tmp_name.  */
 652
 653 static void
 654 lsm_tmp_name_add (const char *s)
 655 {
 656   int l = strlen (s) + lsm_tmp_name_length;
 657   if (l > MAX_LSM_NAME_LENGTH)
 658     return;
 659
 660   strcpy (lsm_tmp_name + lsm_tmp_name_length, s);
 661   lsm_tmp_name_length = l;
 662 }
 663
 664 /* Stores the name for temporary variable that replaces REF to
 665    lsm_tmp_name.  */
 666
 667 static void
 668 gen_lsm_tmp_name (tree ref)
 669 {
 670   const char *name;
 671
 672   switch (TREE_CODE (ref))
 673     {
 674     case MEM_REF:
 675     case TARGET_MEM_REF:
 676       gen_lsm_tmp_name (TREE_OPERAND (ref, 0));
 677       lsm_tmp_name_add ("_");
 678       break;
 679
 680     case ADDR_EXPR:
 681       gen_lsm_tmp_name (TREE_OPERAND (ref, 0));
 682       break;
 683
 684     case BIT_FIELD_REF:
 685     case VIEW_CONVERT_EXPR:
 686     case ARRAY_RANGE_REF:
 687       gen_lsm_tmp_name (TREE_OPERAND (ref, 0));
 688       break;
 689
 690     case REALPART_EXPR:
 691       gen_lsm_tmp_name (TREE_OPERAND (ref, 0));
 692       lsm_tmp_name_add ("_RE");
 693       break;
 694
 695     case IMAGPART_EXPR:
 696       gen_lsm_tmp_name (TREE_OPERAND (ref, 0));
 697       lsm_tmp_name_add ("_IM");
 698       break;
 699
 700     case COMPONENT_REF:
 701       gen_lsm_tmp_name (TREE_OPERAND (ref, 0));
 702       lsm_tmp_name_add ("_");
 703       name = get_name (TREE_OPERAND (ref, 1));
 704       if (!name)
 705         name = "F";
 706       lsm_tmp_name_add (name);
 707       break;
 708
 709     case ARRAY_REF:
 710       gen_lsm_tmp_name (TREE_OPERAND (ref, 0));
 711       lsm_tmp_name_add ("_I");
 712       break;
 713
 714     case SSA_NAME:
 715     case VAR_DECL:
 716     case PARM_DECL:
 717     case FUNCTION_DECL:
 718     case LABEL_DECL:
 719       name = get_name (ref);
 720       if (!name)
 721         name = "D";
 722       lsm_tmp_name_add (name);
 723       break;
 724
 725     case STRING_CST:
 726       lsm_tmp_name_add ("S");
 727       break;
 728
 729     case RESULT_DECL:
 730       lsm_tmp_name_add ("R");
 731       break;
 732
 733     case INTEGER_CST:
 734     default:
 735       /* Nothing.  */
 736       break;
 737     }
 738 }
 739
 740 /* Determines name for temporary variable that replaces REF.
 741    The name is accumulated into the lsm_tmp_name variable.
 742    N is added to the name of the temporary.  */
 743
 744 char *
 745 get_lsm_tmp_name (tree ref, unsigned n, const char *suffix)
 746 {
 747   char ns[2];
 748
 749   lsm_tmp_name_length = 0;
 750   gen_lsm_tmp_name (ref);
 751   lsm_tmp_name_add ("_lsm");
 752   if (n < 10)
 753     {
 754       ns[0] = '0' + n;
 755       ns[1] = 0;
 756       lsm_tmp_name_add (ns);
 757     }
 758   return lsm_tmp_name;
 759   if (suffix != NULL)
 760     lsm_tmp_name_add (suffix);
 761 }
 762
 763 /* Computes an estimated number of insns in LOOP, weighted by WEIGHTS.  */
 764
 765 unsigned
 766 tree_num_loop_insns (struct loop *loop, eni_weights *weights)
 767 {
 768   basic_block *body = get_loop_body (loop);
 769   gimple_stmt_iterator gsi;
 770   unsigned size = 0, i;
 771
 772   for (i = 0; i < loop->num_nodes; i++)
 773     for (gsi = gsi_start_bb (body[i]); !gsi_end_p (gsi); gsi_next (&gsi))
 774       size += estimate_num_insns (gsi_stmt (gsi), weights);
 775   free (body);
 776
 777   return size;
 778 }
 779
 780
 781