gcc/tree-vectorizer.c

   1 /* Vectorizer
   2    Copyright (C) 2003-2015 Free Software Foundation, Inc.
   3    Contributed by Dorit Naishlos <dorit@il.ibm.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* Loop and basic block vectorizer.
  22
  23   This file contains drivers for the three vectorizers:
  24   (1) loop vectorizer (inter-iteration parallelism),
  25   (2) loop-aware SLP (intra-iteration parallelism) (invoked by the loop
  26       vectorizer)
  27   (3) BB vectorizer (out-of-loops), aka SLP
  28
  29   The rest of the vectorizer's code is organized as follows:
  30   - tree-vect-loop.c - loop specific parts such as reductions, etc. These are
  31     used by drivers (1) and (2).
  32   - tree-vect-loop-manip.c - vectorizer's loop control-flow utilities, used by
  33     drivers (1) and (2).
  34   - tree-vect-slp.c - BB vectorization specific analysis and transformation,
  35     used by drivers (2) and (3).
  36   - tree-vect-stmts.c - statements analysis and transformation (used by all).
  37   - tree-vect-data-refs.c - vectorizer specific data-refs analysis and
  38     manipulations (used by all).
  39   - tree-vect-patterns.c - vectorizable code patterns detector (used by all)
  40
  41   Here's a poor attempt at illustrating that:
  42
  43      tree-vectorizer.c:
  44      loop_vect()  loop_aware_slp()  slp_vect()
  45           |        /           \          /
  46           |       /             \        /
  47           tree-vect-loop.c  tree-vect-slp.c
  48                 | \      \  /      /   |
  49                 |  \      \/      /    |
  50                 |   \     /\     /     |
  51                 |    \   /  \   /      |
  52          tree-vect-stmts.c  tree-vect-data-refs.c
  53                        \      /
  54                     tree-vect-patterns.c
  55 */
  56
  57 #include "config.h"
  58 #include "system.h"
  59 #include "coretypes.h"
  60 #include "dumpfile.h"
  61 #include "tm.h"
  62 #include "hash-set.h"
  63 #include "machmode.h"
  64 #include "vec.h"
  65 #include "double-int.h"
  66 #include "input.h"
  67 #include "alias.h"
  68 #include "symtab.h"
  69 #include "wide-int.h"
  70 #include "inchash.h"
  71 #include "tree.h"
  72 #include "fold-const.h"
  73 #include "stor-layout.h"
  74 #include "tree-pretty-print.h"
  75 #include "predict.h"
  76 #include "hard-reg-set.h"
  77 #include "input.h"
  78 #include "function.h"
  79 #include "dominance.h"
  80 #include "cfg.h"
  81 #include "basic-block.h"
  82 #include "tree-ssa-alias.h"
  83 #include "internal-fn.h"
  84 #include "gimple-expr.h"
  85 #include "is-a.h"
  86 #include "gimple.h"
  87 #include "gimple-iterator.h"
  88 #include "gimple-walk.h"
  89 #include "gimple-ssa.h"
  90 #include "hash-map.h"
  91 #include "plugin-api.h"
  92 #include "ipa-ref.h"
  93 #include "cgraph.h"
  94 #include "tree-phinodes.h"
  95 #include "ssa-iterators.h"
  96 #include "tree-ssa-loop-manip.h"
  97 #include "tree-cfg.h"
  98 #include "cfgloop.h"
  99 #include "tree-vectorizer.h"
 100 #include "tree-pass.h"
 101 #include "tree-ssa-propagate.h"
 102 #include "dbgcnt.h"
 103 #include "gimple-fold.h"
 104 #include "tree-scalar-evolution.h"
 105
 106
 107 /* Loop or bb location.  */
 108 source_location vect_location;
 109
 110 /* Vector mapping GIMPLE stmt to stmt_vec_info. */
 111 vec<vec_void_p> stmt_vec_info_vec;
 112 \f
 113 /* For mapping simduid to vectorization factor.  */
 114
 115 struct simduid_to_vf : typed_free_remove<simduid_to_vf>
 116 {
 117   unsigned int simduid;
 118   int vf;
 119
 120   /* hash_table support.  */
 121   typedef simduid_to_vf *value_type;
 122   typedef simduid_to_vf *compare_type;
 123   static inline hashval_t hash (const simduid_to_vf *);
 124   static inline int equal (const simduid_to_vf *, const simduid_to_vf *);
 125 };
 126
 127 inline hashval_t
 128 simduid_to_vf::hash (const simduid_to_vf *p)
 129 {
 130   return p->simduid;
 131 }
 132
 133 inline int
 134 simduid_to_vf::equal (const simduid_to_vf *p1, const simduid_to_vf *p2)
 135 {
 136   return p1->simduid == p2->simduid;
 137 }
 138
 139 /* This hash maps the OMP simd array to the corresponding simduid used
 140    to index into it.  Like thus,
 141
 142         _7 = GOMP_SIMD_LANE (simduid.0)
 143         ...
 144         ...
 145         D.1737[_7] = stuff;
 146
 147
 148    This hash maps from the OMP simd array (D.1737[]) to DECL_UID of
 149    simduid.0.  */
 150
 151 struct simd_array_to_simduid : typed_free_remove<simd_array_to_simduid>
 152 {
 153   tree decl;
 154   unsigned int simduid;
 155
 156   /* hash_table support.  */
 157   typedef simd_array_to_simduid *value_type;
 158   typedef simd_array_to_simduid *compare_type;
 159   static inline hashval_t hash (const simd_array_to_simduid *);
 160   static inline int equal (const simd_array_to_simduid *,
 161                            const simd_array_to_simduid *);
 162 };
 163
 164 inline hashval_t
 165 simd_array_to_simduid::hash (const simd_array_to_simduid *p)
 166 {
 167   return DECL_UID (p->decl);
 168 }
 169
 170 inline int
 171 simd_array_to_simduid::equal (const simd_array_to_simduid *p1,
 172                               const simd_array_to_simduid *p2)
 173 {
 174   return p1->decl == p2->decl;
 175 }
 176
 177 /* Fold IFN_GOMP_SIMD_LANE, IFN_GOMP_SIMD_VF and IFN_GOMP_SIMD_LAST_LANE
 178    into their corresponding constants.  */
 179
 180 static void
 181 adjust_simduid_builtins (hash_table<simduid_to_vf> **htab)
 182 {
 183   basic_block bb;
 184
 185   FOR_EACH_BB_FN (bb, cfun)
 186     {
 187       gimple_stmt_iterator i;
 188
 189       for (i = gsi_start_bb (bb); !gsi_end_p (i); gsi_next (&i))
 190         {
 191           unsigned int vf = 1;
 192           enum internal_fn ifn;
 193           gimple stmt = gsi_stmt (i);
 194           tree t;
 195           if (!is_gimple_call (stmt)
 196               || !gimple_call_internal_p (stmt))
 197             continue;
 198           ifn = gimple_call_internal_fn (stmt);
 199           switch (ifn)
 200             {
 201             case IFN_GOMP_SIMD_LANE:
 202             case IFN_GOMP_SIMD_VF:
 203             case IFN_GOMP_SIMD_LAST_LANE:
 204               break;
 205             default:
 206               continue;
 207             }
 208           tree arg = gimple_call_arg (stmt, 0);
 209           gcc_assert (arg != NULL_TREE);
 210           gcc_assert (TREE_CODE (arg) == SSA_NAME);
 211           simduid_to_vf *p = NULL, data;
 212           data.simduid = DECL_UID (SSA_NAME_VAR (arg));
 213           if (*htab)
 214             p = (*htab)->find (&data);
 215           if (p)
 216             vf = p->vf;
 217           switch (ifn)
 218             {
 219             case IFN_GOMP_SIMD_VF:
 220               t = build_int_cst (unsigned_type_node, vf);
 221               break;
 222             case IFN_GOMP_SIMD_LANE:
 223               t = build_int_cst (unsigned_type_node, 0);
 224               break;
 225             case IFN_GOMP_SIMD_LAST_LANE:
 226               t = gimple_call_arg (stmt, 1);
 227               break;
 228             default:
 229               gcc_unreachable ();
 230             }
 231           update_call_from_tree (&i, t);
 232         }
 233     }
 234 }
 235
 236 /* Helper structure for note_simd_array_uses.  */
 237
 238 struct note_simd_array_uses_struct
 239 {
 240   hash_table<simd_array_to_simduid> **htab;
 241   unsigned int simduid;
 242 };
 243
 244 /* Callback for note_simd_array_uses, called through walk_gimple_op.  */
 245
 246 static tree
 247 note_simd_array_uses_cb (tree *tp, int *walk_subtrees, void *data)
 248 {
 249   struct walk_stmt_info *wi = (struct walk_stmt_info *) data;
 250   struct note_simd_array_uses_struct *ns
 251     = (struct note_simd_array_uses_struct *) wi->info;
 252
 253   if (TYPE_P (*tp))
 254     *walk_subtrees = 0;
 255   else if (VAR_P (*tp)
 256            && lookup_attribute ("omp simd array", DECL_ATTRIBUTES (*tp))
 257            && DECL_CONTEXT (*tp) == current_function_decl)
 258     {
 259       simd_array_to_simduid data;
 260       if (!*ns->htab)
 261         *ns->htab = new hash_table<simd_array_to_simduid> (15);
 262       data.decl = *tp;
 263       data.simduid = ns->simduid;
 264       simd_array_to_simduid **slot = (*ns->htab)->find_slot (&data, INSERT);
 265       if (*slot == NULL)
 266         {
 267           simd_array_to_simduid *p = XNEW (simd_array_to_simduid);
 268           *p = data;
 269           *slot = p;
 270         }
 271       else if ((*slot)->simduid != ns->simduid)
 272         (*slot)->simduid = -1U;
 273       *walk_subtrees = 0;
 274     }
 275   return NULL_TREE;
 276 }
 277
 278 /* Find "omp simd array" temporaries and map them to corresponding
 279    simduid.  */
 280
 281 static void
 282 note_simd_array_uses (hash_table<simd_array_to_simduid> **htab)
 283 {
 284   basic_block bb;
 285   gimple_stmt_iterator gsi;
 286   struct walk_stmt_info wi;
 287   struct note_simd_array_uses_struct ns;
 288
 289   memset (&wi, 0, sizeof (wi));
 290   wi.info = &ns;
 291   ns.htab = htab;
 292
 293   FOR_EACH_BB_FN (bb, cfun)
 294     for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 295       {
 296         gimple stmt = gsi_stmt (gsi);
 297         if (!is_gimple_call (stmt) || !gimple_call_internal_p (stmt))
 298           continue;
 299         switch (gimple_call_internal_fn (stmt))
 300           {
 301           case IFN_GOMP_SIMD_LANE:
 302           case IFN_GOMP_SIMD_VF:
 303           case IFN_GOMP_SIMD_LAST_LANE:
 304             break;
 305           default:
 306             continue;
 307           }
 308         tree lhs = gimple_call_lhs (stmt);
 309         if (lhs == NULL_TREE)
 310           continue;
 311         imm_use_iterator use_iter;
 312         gimple use_stmt;
 313         ns.simduid = DECL_UID (SSA_NAME_VAR (gimple_call_arg (stmt, 0)));
 314         FOR_EACH_IMM_USE_STMT (use_stmt, use_iter, lhs)
 315           if (!is_gimple_debug (use_stmt))
 316             walk_gimple_op (use_stmt, note_simd_array_uses_cb, &wi);
 317       }
 318 }
 319 \f
 320 /* A helper function to free data refs.  */
 321
 322 void
 323 vect_destroy_datarefs (loop_vec_info loop_vinfo, bb_vec_info bb_vinfo)
 324 {
 325   vec<data_reference_p> datarefs;
 326   struct data_reference *dr;
 327   unsigned int i;
 328
 329  if (loop_vinfo)
 330     datarefs = LOOP_VINFO_DATAREFS (loop_vinfo);
 331   else
 332     datarefs = BB_VINFO_DATAREFS (bb_vinfo);
 333
 334   FOR_EACH_VEC_ELT (datarefs, i, dr)
 335     if (dr->aux)
 336       {
 337         free (dr->aux);
 338         dr->aux = NULL;
 339       }
 340
 341   free_data_refs (datarefs);
 342 }
 343
 344
 345 /* If LOOP has been versioned during ifcvt, return the internal call
 346    guarding it.  */
 347
 348 static gimple
 349 vect_loop_vectorized_call (struct loop *loop)
 350 {
 351   basic_block bb = loop_preheader_edge (loop)->src;
 352   gimple g;
 353   do
 354     {
 355       g = last_stmt (bb);
 356       if (g)
 357         break;
 358       if (!single_pred_p (bb))
 359         break;
 360       bb = single_pred (bb);
 361     }
 362   while (1);
 363   if (g && gimple_code (g) == GIMPLE_COND)
 364     {
 365       gimple_stmt_iterator gsi = gsi_for_stmt (g);
 366       gsi_prev (&gsi);
 367       if (!gsi_end_p (gsi))
 368         {
 369           g = gsi_stmt (gsi);
 370           if (is_gimple_call (g)
 371               && gimple_call_internal_p (g)
 372               && gimple_call_internal_fn (g) == IFN_LOOP_VECTORIZED
 373               && (tree_to_shwi (gimple_call_arg (g, 0)) == loop->num
 374                   || tree_to_shwi (gimple_call_arg (g, 1)) == loop->num))
 375             return g;
 376         }
 377     }
 378   return NULL;
 379 }
 380
 381 /* Fold LOOP_VECTORIZED internal call G to VALUE and
 382    update any immediate uses of it's LHS.  */
 383
 384 static void
 385 fold_loop_vectorized_call (gimple g, tree value)
 386 {
 387   tree lhs = gimple_call_lhs (g);
 388   use_operand_p use_p;
 389   imm_use_iterator iter;
 390   gimple use_stmt;
 391   gimple_stmt_iterator gsi = gsi_for_stmt (g);
 392
 393   update_call_from_tree (&gsi, value);
 394   FOR_EACH_IMM_USE_STMT (use_stmt, iter, lhs)
 395     {
 396       FOR_EACH_IMM_USE_ON_STMT (use_p, iter)
 397         SET_USE (use_p, value);
 398       update_stmt (use_stmt);
 399     }
 400 }
 401
 402 /* Function vectorize_loops.
 403
 404    Entry point to loop vectorization phase.  */
 405
 406 unsigned
 407 vectorize_loops (void)
 408 {
 409   unsigned int i;
 410   unsigned int num_vectorized_loops = 0;
 411   unsigned int vect_loops_num;
 412   struct loop *loop;
 413   hash_table<simduid_to_vf> *simduid_to_vf_htab = NULL;
 414   hash_table<simd_array_to_simduid> *simd_array_to_simduid_htab = NULL;
 415   bool any_ifcvt_loops = false;
 416   unsigned ret = 0;
 417
 418   vect_loops_num = number_of_loops (cfun);
 419
 420   /* Bail out if there are no loops.  */
 421   if (vect_loops_num <= 1)
 422     {
 423       if (cfun->has_simduid_loops)
 424         adjust_simduid_builtins (&simduid_to_vf_htab);
 425       return 0;
 426     }
 427
 428   if (cfun->has_simduid_loops)
 429     note_simd_array_uses (&simd_array_to_simduid_htab);
 430
 431   init_stmt_vec_info_vec ();
 432
 433   /*  ----------- Analyze loops. -----------  */
 434
 435   /* If some loop was duplicated, it gets bigger number
 436      than all previously defined loops.  This fact allows us to run
 437      only over initial loops skipping newly generated ones.  */
 438   FOR_EACH_LOOP (loop, 0)
 439     if (loop->dont_vectorize)
 440       any_ifcvt_loops = true;
 441     else if ((flag_tree_loop_vectorize
 442               && optimize_loop_nest_for_speed_p (loop))
 443              || loop->force_vectorize)
 444       {
 445         loop_vec_info loop_vinfo;
 446         vect_location = find_loop_location (loop);
 447         if (LOCATION_LOCUS (vect_location) != UNKNOWN_LOCATION
 448             && dump_enabled_p ())
 449           dump_printf (MSG_NOTE, "\nAnalyzing loop at %s:%d\n",
 450                        LOCATION_FILE (vect_location),
 451                        LOCATION_LINE (vect_location));
 452
 453         loop_vinfo = vect_analyze_loop (loop);
 454         loop->aux = loop_vinfo;
 455
 456         if (!loop_vinfo || !LOOP_VINFO_VECTORIZABLE_P (loop_vinfo))
 457           continue;
 458
 459         if (!dbg_cnt (vect_loop))
 460           break;
 461
 462         gimple loop_vectorized_call = vect_loop_vectorized_call (loop);
 463         if (loop_vectorized_call)
 464           {
 465             tree arg = gimple_call_arg (loop_vectorized_call, 1);
 466             basic_block *bbs;
 467             unsigned int i;
 468             struct loop *scalar_loop = get_loop (cfun, tree_to_shwi (arg));
 469
 470             LOOP_VINFO_SCALAR_LOOP (loop_vinfo) = scalar_loop;
 471             gcc_checking_assert (vect_loop_vectorized_call
 472                                         (LOOP_VINFO_SCALAR_LOOP (loop_vinfo))
 473                                  == loop_vectorized_call);
 474             bbs = get_loop_body (scalar_loop);
 475             for (i = 0; i < scalar_loop->num_nodes; i++)
 476               {
 477                 basic_block bb = bbs[i];
 478                 gimple_stmt_iterator gsi;
 479                 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi);
 480                      gsi_next (&gsi))
 481                   {
 482                     gimple phi = gsi_stmt (gsi);
 483                     gimple_set_uid (phi, 0);
 484                   }
 485                 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi);
 486                      gsi_next (&gsi))
 487                   {
 488                     gimple stmt = gsi_stmt (gsi);
 489                     gimple_set_uid (stmt, 0);
 490                   }
 491               }
 492             free (bbs);
 493           }
 494
 495         if (LOCATION_LOCUS (vect_location) != UNKNOWN_LOCATION
 496             && dump_enabled_p ())
 497           dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, vect_location,
 498                            "loop vectorized\n");
 499         vect_transform_loop (loop_vinfo);
 500         num_vectorized_loops++;
 501         /* Now that the loop has been vectorized, allow it to be unrolled
 502            etc.  */
 503         loop->force_vectorize = false;
 504
 505         if (loop->simduid)
 506           {
 507             simduid_to_vf *simduid_to_vf_data = XNEW (simduid_to_vf);
 508             if (!simduid_to_vf_htab)
 509               simduid_to_vf_htab = new hash_table<simduid_to_vf> (15);
 510             simduid_to_vf_data->simduid = DECL_UID (loop->simduid);
 511             simduid_to_vf_data->vf = loop_vinfo->vectorization_factor;
 512             *simduid_to_vf_htab->find_slot (simduid_to_vf_data, INSERT)
 513               = simduid_to_vf_data;
 514           }
 515
 516         if (loop_vectorized_call)
 517           {
 518             fold_loop_vectorized_call (loop_vectorized_call, boolean_true_node);
 519             ret |= TODO_cleanup_cfg;
 520           }
 521       }
 522
 523   vect_location = UNKNOWN_LOCATION;
 524
 525   statistics_counter_event (cfun, "Vectorized loops", num_vectorized_loops);
 526   if (dump_enabled_p ()
 527       || (num_vectorized_loops > 0 && dump_enabled_p ()))
 528     dump_printf_loc (MSG_NOTE, vect_location,
 529                      "vectorized %u loops in function.\n",
 530                      num_vectorized_loops);
 531
 532   /*  ----------- Finalize. -----------  */
 533
 534   if (any_ifcvt_loops)
 535     for (i = 1; i < vect_loops_num; i++)
 536       {
 537         loop = get_loop (cfun, i);
 538         if (loop && loop->dont_vectorize)
 539           {
 540             gimple g = vect_loop_vectorized_call (loop);
 541             if (g)
 542               {
 543                 fold_loop_vectorized_call (g, boolean_false_node);
 544                 ret |= TODO_cleanup_cfg;
 545               }
 546           }
 547       }
 548
 549   for (i = 1; i < vect_loops_num; i++)
 550     {
 551       loop_vec_info loop_vinfo;
 552
 553       loop = get_loop (cfun, i);
 554       if (!loop)
 555         continue;
 556       loop_vinfo = (loop_vec_info) loop->aux;
 557       destroy_loop_vec_info (loop_vinfo, true);
 558       loop->aux = NULL;
 559     }
 560
 561   free_stmt_vec_info_vec ();
 562
 563   /* Fold IFN_GOMP_SIMD_{VF,LANE,LAST_LANE} builtins.  */
 564   if (cfun->has_simduid_loops)
 565     adjust_simduid_builtins (&simduid_to_vf_htab);
 566
 567   /* Shrink any "omp array simd" temporary arrays to the
 568      actual vectorization factors.  */
 569   if (simd_array_to_simduid_htab)
 570     {
 571       for (hash_table<simd_array_to_simduid>::iterator iter
 572            = simd_array_to_simduid_htab->begin ();
 573            iter != simd_array_to_simduid_htab->end (); ++iter)
 574         if ((*iter)->simduid != -1U)
 575           {
 576             tree decl = (*iter)->decl;
 577             int vf = 1;
 578             if (simduid_to_vf_htab)
 579               {
 580                 simduid_to_vf *p = NULL, data;
 581                 data.simduid = (*iter)->simduid;
 582                 p = simduid_to_vf_htab->find (&data);
 583                 if (p)
 584                   vf = p->vf;
 585               }
 586             tree atype
 587               = build_array_type_nelts (TREE_TYPE (TREE_TYPE (decl)), vf);
 588             TREE_TYPE (decl) = atype;
 589             relayout_decl (decl);
 590           }
 591
 592       delete simd_array_to_simduid_htab;
 593     }
 594     delete simduid_to_vf_htab;
 595     simduid_to_vf_htab = NULL;
 596
 597   if (num_vectorized_loops > 0)
 598     {
 599       /* If we vectorized any loop only virtual SSA form needs to be updated.
 600          ???  Also while we try hard to update loop-closed SSA form we fail
 601          to properly do this in some corner-cases (see PR56286).  */
 602       rewrite_into_loop_closed_ssa (NULL, TODO_update_ssa_only_virtuals);
 603       return TODO_cleanup_cfg;
 604     }
 605
 606   return ret;
 607 }
 608
 609
 610 /*  Entry point to basic block SLP phase.  */
 611
 612 namespace {
 613
 614 const pass_data pass_data_slp_vectorize =
 615 {
 616   GIMPLE_PASS, /* type */
 617   "slp", /* name */
 618   OPTGROUP_LOOP | OPTGROUP_VEC, /* optinfo_flags */
 619   TV_TREE_SLP_VECTORIZATION, /* tv_id */
 620   ( PROP_ssa | PROP_cfg ), /* properties_required */
 621   0, /* properties_provided */
 622   0, /* properties_destroyed */
 623   0, /* todo_flags_start */
 624   TODO_update_ssa, /* todo_flags_finish */
 625 };
 626
 627 class pass_slp_vectorize : public gimple_opt_pass
 628 {
 629 public:
 630   pass_slp_vectorize (gcc::context *ctxt)
 631     : gimple_opt_pass (pass_data_slp_vectorize, ctxt)
 632   {}
 633
 634   /* opt_pass methods: */
 635   opt_pass * clone () { return new pass_slp_vectorize (m_ctxt); }
 636   virtual bool gate (function *) { return flag_tree_slp_vectorize != 0; }
 637   virtual unsigned int execute (function *);
 638
 639 }; // class pass_slp_vectorize
 640
 641 unsigned int
 642 pass_slp_vectorize::execute (function *fun)
 643 {
 644   basic_block bb;
 645
 646   bool in_loop_pipeline = scev_initialized_p ();
 647   if (!in_loop_pipeline)
 648     {
 649       loop_optimizer_init (LOOPS_NORMAL);
 650       scev_initialize ();
 651     }
 652
 653   init_stmt_vec_info_vec ();
 654
 655   FOR_EACH_BB_FN (bb, fun)
 656     {
 657       vect_location = find_bb_location (bb);
 658
 659       if (vect_slp_analyze_bb (bb))
 660         {
 661           if (!dbg_cnt (vect_slp))
 662             break;
 663
 664           vect_slp_transform_bb (bb);
 665           if (dump_enabled_p ())
 666             dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, vect_location,
 667                              "basic block vectorized\n");
 668         }
 669     }
 670
 671   free_stmt_vec_info_vec ();
 672
 673   if (!in_loop_pipeline)
 674     {
 675       scev_finalize ();
 676       loop_optimizer_finalize ();
 677     }
 678
 679   return 0;
 680 }
 681
 682 } // anon namespace
 683
 684 gimple_opt_pass *
 685 make_pass_slp_vectorize (gcc::context *ctxt)
 686 {
 687   return new pass_slp_vectorize (ctxt);
 688 }
 689
 690
 691 /* Increase alignment of global arrays to improve vectorization potential.
 692    TODO:
 693    - Consider also structs that have an array field.
 694    - Use ipa analysis to prune arrays that can't be vectorized?
 695      This should involve global alignment analysis and in the future also
 696      array padding.  */
 697
 698 static unsigned int
 699 increase_alignment (void)
 700 {
 701   varpool_node *vnode;
 702
 703   vect_location = UNKNOWN_LOCATION;
 704
 705   /* Increase the alignment of all global arrays for vectorization.  */
 706   FOR_EACH_DEFINED_VARIABLE (vnode)
 707     {
 708       tree vectype, decl = vnode->decl;
 709       tree t;
 710       unsigned int alignment;
 711
 712       t = TREE_TYPE (decl);
 713       if (TREE_CODE (t) != ARRAY_TYPE)
 714         continue;
 715       vectype = get_vectype_for_scalar_type (strip_array_types (t));
 716       if (!vectype)
 717         continue;
 718       alignment = TYPE_ALIGN (vectype);
 719       if (DECL_ALIGN (decl) >= alignment)
 720         continue;
 721
 722       if (vect_can_force_dr_alignment_p (decl, alignment))
 723         {
 724           vnode->increase_alignment (TYPE_ALIGN (vectype));
 725           dump_printf (MSG_NOTE, "Increasing alignment of decl: ");
 726           dump_generic_expr (MSG_NOTE, TDF_SLIM, decl);
 727           dump_printf (MSG_NOTE, "\n");
 728         }
 729     }
 730   return 0;
 731 }
 732
 733
 734 namespace {
 735
 736 const pass_data pass_data_ipa_increase_alignment =
 737 {
 738   SIMPLE_IPA_PASS, /* type */
 739   "increase_alignment", /* name */
 740   OPTGROUP_LOOP | OPTGROUP_VEC, /* optinfo_flags */
 741   TV_IPA_OPT, /* tv_id */
 742   0, /* properties_required */
 743   0, /* properties_provided */
 744   0, /* properties_destroyed */
 745   0, /* todo_flags_start */
 746   0, /* todo_flags_finish */
 747 };
 748
 749 class pass_ipa_increase_alignment : public simple_ipa_opt_pass
 750 {
 751 public:
 752   pass_ipa_increase_alignment (gcc::context *ctxt)
 753     : simple_ipa_opt_pass (pass_data_ipa_increase_alignment, ctxt)
 754   {}
 755
 756   /* opt_pass methods: */
 757   virtual bool gate (function *)
 758     {
 759       return flag_section_anchors && flag_tree_loop_vectorize;
 760     }
 761
 762   virtual unsigned int execute (function *) { return increase_alignment (); }
 763
 764 }; // class pass_ipa_increase_alignment
 765
 766 } // anon namespace
 767
 768 simple_ipa_opt_pass *
 769 make_pass_ipa_increase_alignment (gcc::context *ctxt)
 770 {
 771   return new pass_ipa_increase_alignment (ctxt);
 772 }