gcc/tree-vectorizer.c

   1 /* Vectorizer
   2    Copyright (C) 2003-2016 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 "backend.h"
  61 #include "tree.h"
  62 #include "gimple.h"
  63 #include "predict.h"
  64 #include "tree-pass.h"
  65 #include "ssa.h"
  66 #include "cgraph.h"
  67 #include "fold-const.h"
  68 #include "stor-layout.h"
  69 #include "gimple-iterator.h"
  70 #include "gimple-walk.h"
  71 #include "tree-ssa-loop-manip.h"
  72 #include "tree-ssa-loop-niter.h"
  73 #include "tree-cfg.h"
  74 #include "cfgloop.h"
  75 #include "tree-vectorizer.h"
  76 #include "tree-ssa-propagate.h"
  77 #include "dbgcnt.h"
  78 #include "tree-scalar-evolution.h"
  79
  80
  81 /* Loop or bb location.  */
  82 source_location vect_location;
  83
  84 /* Vector mapping GIMPLE stmt to stmt_vec_info. */
  85 vec<stmt_vec_info> stmt_vec_info_vec;
  86 \f
  87 /* For mapping simduid to vectorization factor.  */
  88
  89 struct simduid_to_vf : free_ptr_hash<simduid_to_vf>
  90 {
  91   unsigned int simduid;
  92   int vf;
  93
  94   /* hash_table support.  */
  95   static inline hashval_t hash (const simduid_to_vf *);
  96   static inline int equal (const simduid_to_vf *, const simduid_to_vf *);
  97 };
  98
  99 inline hashval_t
 100 simduid_to_vf::hash (const simduid_to_vf *p)
 101 {
 102   return p->simduid;
 103 }
 104
 105 inline int
 106 simduid_to_vf::equal (const simduid_to_vf *p1, const simduid_to_vf *p2)
 107 {
 108   return p1->simduid == p2->simduid;
 109 }
 110
 111 /* This hash maps the OMP simd array to the corresponding simduid used
 112    to index into it.  Like thus,
 113
 114         _7 = GOMP_SIMD_LANE (simduid.0)
 115         ...
 116         ...
 117         D.1737[_7] = stuff;
 118
 119
 120    This hash maps from the OMP simd array (D.1737[]) to DECL_UID of
 121    simduid.0.  */
 122
 123 struct simd_array_to_simduid : free_ptr_hash<simd_array_to_simduid>
 124 {
 125   tree decl;
 126   unsigned int simduid;
 127
 128   /* hash_table support.  */
 129   static inline hashval_t hash (const simd_array_to_simduid *);
 130   static inline int equal (const simd_array_to_simduid *,
 131                            const simd_array_to_simduid *);
 132 };
 133
 134 inline hashval_t
 135 simd_array_to_simduid::hash (const simd_array_to_simduid *p)
 136 {
 137   return DECL_UID (p->decl);
 138 }
 139
 140 inline int
 141 simd_array_to_simduid::equal (const simd_array_to_simduid *p1,
 142                               const simd_array_to_simduid *p2)
 143 {
 144   return p1->decl == p2->decl;
 145 }
 146
 147 /* Fold IFN_GOMP_SIMD_LANE, IFN_GOMP_SIMD_VF, IFN_GOMP_SIMD_LAST_LANE,
 148    into their corresponding constants and remove
 149    IFN_GOMP_SIMD_ORDERED_{START,END}.  */
 150
 151 static void
 152 adjust_simduid_builtins (hash_table<simduid_to_vf> *htab)
 153 {
 154   basic_block bb;
 155
 156   FOR_EACH_BB_FN (bb, cfun)
 157     {
 158       gimple_stmt_iterator i;
 159
 160       for (i = gsi_start_bb (bb); !gsi_end_p (i); )
 161         {
 162           unsigned int vf = 1;
 163           enum internal_fn ifn;
 164           gimple *stmt = gsi_stmt (i);
 165           tree t;
 166           if (!is_gimple_call (stmt)
 167               || !gimple_call_internal_p (stmt))
 168             {
 169               gsi_next (&i);
 170               continue;
 171             }
 172           ifn = gimple_call_internal_fn (stmt);
 173           switch (ifn)
 174             {
 175             case IFN_GOMP_SIMD_LANE:
 176             case IFN_GOMP_SIMD_VF:
 177             case IFN_GOMP_SIMD_LAST_LANE:
 178               break;
 179             case IFN_GOMP_SIMD_ORDERED_START:
 180             case IFN_GOMP_SIMD_ORDERED_END:
 181               if (integer_onep (gimple_call_arg (stmt, 0)))
 182                 {
 183                   enum built_in_function bcode
 184                     = (ifn == IFN_GOMP_SIMD_ORDERED_START
 185                        ? BUILT_IN_GOMP_ORDERED_START
 186                        : BUILT_IN_GOMP_ORDERED_END);
 187                   gimple *g
 188                     = gimple_build_call (builtin_decl_explicit (bcode), 0);
 189                   tree vdef = gimple_vdef (stmt);
 190                   gimple_set_vdef (g, vdef);
 191                   SSA_NAME_DEF_STMT (vdef) = g;
 192                   gimple_set_vuse (g, gimple_vuse (stmt));
 193                   gsi_replace (&i, g, true);
 194                   continue;
 195                 }
 196               gsi_remove (&i, true);
 197               unlink_stmt_vdef (stmt);
 198               continue;
 199             default:
 200               gsi_next (&i);
 201               continue;
 202             }
 203           tree arg = gimple_call_arg (stmt, 0);
 204           gcc_assert (arg != NULL_TREE);
 205           gcc_assert (TREE_CODE (arg) == SSA_NAME);
 206           simduid_to_vf *p = NULL, data;
 207           data.simduid = DECL_UID (SSA_NAME_VAR (arg));
 208           /* Need to nullify loop safelen field since it's value is not
 209              valid after transformation.  */
 210           if (bb->loop_father && bb->loop_father->safelen > 0)
 211             bb->loop_father->safelen = 0;
 212           if (htab)
 213             {
 214               p = htab->find (&data);
 215               if (p)
 216                 vf = p->vf;
 217             }
 218           switch (ifn)
 219             {
 220             case IFN_GOMP_SIMD_VF:
 221               t = build_int_cst (unsigned_type_node, vf);
 222               break;
 223             case IFN_GOMP_SIMD_LANE:
 224               t = build_int_cst (unsigned_type_node, 0);
 225               break;
 226             case IFN_GOMP_SIMD_LAST_LANE:
 227               t = gimple_call_arg (stmt, 1);
 228               break;
 229             default:
 230               gcc_unreachable ();
 231             }
 232           update_call_from_tree (&i, t);
 233           gsi_next (&i);
 234         }
 235     }
 236 }
 237
 238 /* Helper structure for note_simd_array_uses.  */
 239
 240 struct note_simd_array_uses_struct
 241 {
 242   hash_table<simd_array_to_simduid> **htab;
 243   unsigned int simduid;
 244 };
 245
 246 /* Callback for note_simd_array_uses, called through walk_gimple_op.  */
 247
 248 static tree
 249 note_simd_array_uses_cb (tree *tp, int *walk_subtrees, void *data)
 250 {
 251   struct walk_stmt_info *wi = (struct walk_stmt_info *) data;
 252   struct note_simd_array_uses_struct *ns
 253     = (struct note_simd_array_uses_struct *) wi->info;
 254
 255   if (TYPE_P (*tp))
 256     *walk_subtrees = 0;
 257   else if (VAR_P (*tp)
 258            && lookup_attribute ("omp simd array", DECL_ATTRIBUTES (*tp))
 259            && DECL_CONTEXT (*tp) == current_function_decl)
 260     {
 261       simd_array_to_simduid data;
 262       if (!*ns->htab)
 263         *ns->htab = new hash_table<simd_array_to_simduid> (15);
 264       data.decl = *tp;
 265       data.simduid = ns->simduid;
 266       simd_array_to_simduid **slot = (*ns->htab)->find_slot (&data, INSERT);
 267       if (*slot == NULL)
 268         {
 269           simd_array_to_simduid *p = XNEW (simd_array_to_simduid);
 270           *p = data;
 271           *slot = p;
 272         }
 273       else if ((*slot)->simduid != ns->simduid)
 274         (*slot)->simduid = -1U;
 275       *walk_subtrees = 0;
 276     }
 277   return NULL_TREE;
 278 }
 279
 280 /* Find "omp simd array" temporaries and map them to corresponding
 281    simduid.  */
 282
 283 static void
 284 note_simd_array_uses (hash_table<simd_array_to_simduid> **htab)
 285 {
 286   basic_block bb;
 287   gimple_stmt_iterator gsi;
 288   struct walk_stmt_info wi;
 289   struct note_simd_array_uses_struct ns;
 290
 291   memset (&wi, 0, sizeof (wi));
 292   wi.info = &ns;
 293   ns.htab = htab;
 294
 295   FOR_EACH_BB_FN (bb, cfun)
 296     for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 297       {
 298         gimple *stmt = gsi_stmt (gsi);
 299         if (!is_gimple_call (stmt) || !gimple_call_internal_p (stmt))
 300           continue;
 301         switch (gimple_call_internal_fn (stmt))
 302           {
 303           case IFN_GOMP_SIMD_LANE:
 304           case IFN_GOMP_SIMD_VF:
 305           case IFN_GOMP_SIMD_LAST_LANE:
 306             break;
 307           default:
 308             continue;
 309           }
 310         tree lhs = gimple_call_lhs (stmt);
 311         if (lhs == NULL_TREE)
 312           continue;
 313         imm_use_iterator use_iter;
 314         gimple *use_stmt;
 315         ns.simduid = DECL_UID (SSA_NAME_VAR (gimple_call_arg (stmt, 0)));
 316         FOR_EACH_IMM_USE_STMT (use_stmt, use_iter, lhs)
 317           if (!is_gimple_debug (use_stmt))
 318             walk_gimple_op (use_stmt, note_simd_array_uses_cb, &wi);
 319       }
 320 }
 321
 322 /* Shrink arrays with "omp simd array" attribute to the corresponding
 323    vectorization factor.  */
 324
 325 static void
 326 shrink_simd_arrays
 327   (hash_table<simd_array_to_simduid> *simd_array_to_simduid_htab,
 328    hash_table<simduid_to_vf> *simduid_to_vf_htab)
 329 {
 330   for (hash_table<simd_array_to_simduid>::iterator iter
 331          = simd_array_to_simduid_htab->begin ();
 332        iter != simd_array_to_simduid_htab->end (); ++iter)
 333     if ((*iter)->simduid != -1U)
 334       {
 335         tree decl = (*iter)->decl;
 336         int vf = 1;
 337         if (simduid_to_vf_htab)
 338           {
 339             simduid_to_vf *p = NULL, data;
 340             data.simduid = (*iter)->simduid;
 341             p = simduid_to_vf_htab->find (&data);
 342             if (p)
 343               vf = p->vf;
 344           }
 345         tree atype
 346           = build_array_type_nelts (TREE_TYPE (TREE_TYPE (decl)), vf);
 347         TREE_TYPE (decl) = atype;
 348         relayout_decl (decl);
 349       }
 350
 351   delete simd_array_to_simduid_htab;
 352 }
 353 \f
 354 /* A helper function to free data refs.  */
 355
 356 void
 357 vect_destroy_datarefs (vec_info *vinfo)
 358 {
 359   struct data_reference *dr;
 360   unsigned int i;
 361
 362   FOR_EACH_VEC_ELT (vinfo->datarefs, i, dr)
 363     if (dr->aux)
 364       {
 365         free (dr->aux);
 366         dr->aux = NULL;
 367       }
 368
 369   free_data_refs (vinfo->datarefs);
 370 }
 371
 372 /* A helper function to free scev and LOOP niter information, as well as
 373    clear loop constraint LOOP_C_FINITE.  */
 374
 375 void
 376 vect_free_loop_info_assumptions (struct loop *loop)
 377 {
 378   scev_reset_htab ();
 379   /* We need to explicitly reset upper bound information since they are
 380      used even after free_numbers_of_iterations_estimates_loop.  */
 381   loop->any_upper_bound = false;
 382   loop->any_likely_upper_bound = false;
 383   free_numbers_of_iterations_estimates_loop (loop);
 384   loop_constraint_clear (loop, LOOP_C_FINITE);
 385 }
 386
 387 /* Return whether STMT is inside the region we try to vectorize.  */
 388
 389 bool
 390 vect_stmt_in_region_p (vec_info *vinfo, gimple *stmt)
 391 {
 392   if (!gimple_bb (stmt))
 393     return false;
 394
 395   if (loop_vec_info loop_vinfo = dyn_cast <loop_vec_info> (vinfo))
 396     {
 397       struct loop *loop = LOOP_VINFO_LOOP (loop_vinfo);
 398       if (!flow_bb_inside_loop_p (loop, gimple_bb (stmt)))
 399         return false;
 400     }
 401   else
 402     {
 403       bb_vec_info bb_vinfo = as_a <bb_vec_info> (vinfo);
 404       if (gimple_bb (stmt) != BB_VINFO_BB (bb_vinfo)
 405           || gimple_uid (stmt) == -1U
 406           || gimple_code (stmt) == GIMPLE_PHI)
 407         return false;
 408     }
 409
 410   return true;
 411 }
 412
 413
 414 /* If LOOP has been versioned during ifcvt, return the internal call
 415    guarding it.  */
 416
 417 static gimple *
 418 vect_loop_vectorized_call (struct loop *loop)
 419 {
 420   basic_block bb = loop_preheader_edge (loop)->src;
 421   gimple *g;
 422   do
 423     {
 424       g = last_stmt (bb);
 425       if (g)
 426         break;
 427       if (!single_pred_p (bb))
 428         break;
 429       bb = single_pred (bb);
 430     }
 431   while (1);
 432   if (g && gimple_code (g) == GIMPLE_COND)
 433     {
 434       gimple_stmt_iterator gsi = gsi_for_stmt (g);
 435       gsi_prev (&gsi);
 436       if (!gsi_end_p (gsi))
 437         {
 438           g = gsi_stmt (gsi);
 439           if (gimple_call_internal_p (g, IFN_LOOP_VECTORIZED)
 440               && (tree_to_shwi (gimple_call_arg (g, 0)) == loop->num
 441                   || tree_to_shwi (gimple_call_arg (g, 1)) == loop->num))
 442             return g;
 443         }
 444     }
 445   return NULL;
 446 }
 447
 448 /* Fold LOOP_VECTORIZED internal call G to VALUE and
 449    update any immediate uses of it's LHS.  */
 450
 451 static void
 452 fold_loop_vectorized_call (gimple *g, tree value)
 453 {
 454   tree lhs = gimple_call_lhs (g);
 455   use_operand_p use_p;
 456   imm_use_iterator iter;
 457   gimple *use_stmt;
 458   gimple_stmt_iterator gsi = gsi_for_stmt (g);
 459
 460   update_call_from_tree (&gsi, value);
 461   FOR_EACH_IMM_USE_STMT (use_stmt, iter, lhs)
 462     {
 463       FOR_EACH_IMM_USE_ON_STMT (use_p, iter)
 464         SET_USE (use_p, value);
 465       update_stmt (use_stmt);
 466     }
 467 }
 468 /* Set the uids of all the statements in basic blocks inside loop
 469    represented by LOOP_VINFO. LOOP_VECTORIZED_CALL is the internal
 470    call guarding the loop which has been if converted.  */
 471 static void
 472 set_uid_loop_bbs (loop_vec_info loop_vinfo, gimple *loop_vectorized_call)
 473 {
 474   tree arg = gimple_call_arg (loop_vectorized_call, 1);
 475   basic_block *bbs;
 476   unsigned int i;
 477   struct loop *scalar_loop = get_loop (cfun, tree_to_shwi (arg));
 478
 479   LOOP_VINFO_SCALAR_LOOP (loop_vinfo) = scalar_loop;
 480   gcc_checking_assert (vect_loop_vectorized_call
 481                        (LOOP_VINFO_SCALAR_LOOP (loop_vinfo))
 482                        == loop_vectorized_call);
 483   bbs = get_loop_body (scalar_loop);
 484   for (i = 0; i < scalar_loop->num_nodes; i++)
 485     {
 486       basic_block bb = bbs[i];
 487       gimple_stmt_iterator gsi;
 488       for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 489         {
 490           gimple *phi = gsi_stmt (gsi);
 491           gimple_set_uid (phi, 0);
 492         }
 493       for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 494         {
 495           gimple *stmt = gsi_stmt (gsi);
 496           gimple_set_uid (stmt, 0);
 497         }
 498     }
 499   free (bbs);
 500 }
 501
 502 /* Function vectorize_loops.
 503
 504    Entry point to loop vectorization phase.  */
 505
 506 unsigned
 507 vectorize_loops (void)
 508 {
 509   unsigned int i;
 510   unsigned int num_vectorized_loops = 0;
 511   unsigned int vect_loops_num;
 512   struct loop *loop;
 513   hash_table<simduid_to_vf> *simduid_to_vf_htab = NULL;
 514   hash_table<simd_array_to_simduid> *simd_array_to_simduid_htab = NULL;
 515   bool any_ifcvt_loops = false;
 516   unsigned ret = 0;
 517
 518   vect_loops_num = number_of_loops (cfun);
 519
 520   /* Bail out if there are no loops.  */
 521   if (vect_loops_num <= 1)
 522     return 0;
 523
 524   if (cfun->has_simduid_loops)
 525     note_simd_array_uses (&simd_array_to_simduid_htab);
 526
 527   init_stmt_vec_info_vec ();
 528
 529   /*  ----------- Analyze loops. -----------  */
 530
 531   /* If some loop was duplicated, it gets bigger number
 532      than all previously defined loops.  This fact allows us to run
 533      only over initial loops skipping newly generated ones.  */
 534   FOR_EACH_LOOP (loop, 0)
 535     if (loop->dont_vectorize)
 536       any_ifcvt_loops = true;
 537     else if ((flag_tree_loop_vectorize
 538               && optimize_loop_nest_for_speed_p (loop))
 539              || loop->force_vectorize)
 540       {
 541         loop_vec_info loop_vinfo;
 542         vect_location = find_loop_location (loop);
 543         if (LOCATION_LOCUS (vect_location) != UNKNOWN_LOCATION
 544             && dump_enabled_p ())
 545           dump_printf (MSG_NOTE, "\nAnalyzing loop at %s:%d\n",
 546                        LOCATION_FILE (vect_location),
 547                        LOCATION_LINE (vect_location));
 548
 549         loop_vinfo = vect_analyze_loop (loop);
 550         loop->aux = loop_vinfo;
 551
 552         if (!loop_vinfo || !LOOP_VINFO_VECTORIZABLE_P (loop_vinfo))
 553           {
 554             /* Free existing information if loop is analyzed with some
 555                assumptions.  */
 556             if (loop_constraint_set_p (loop, LOOP_C_FINITE))
 557               vect_free_loop_info_assumptions (loop);
 558
 559             continue;
 560           }
 561
 562         if (!dbg_cnt (vect_loop))
 563           {
 564             /* We may miss some if-converted loops due to
 565                debug counter.  Set any_ifcvt_loops to visit
 566                them at finalization.  */
 567             any_ifcvt_loops = true;
 568             /* Free existing information if loop is analyzed with some
 569                assumptions.  */
 570             if (loop_constraint_set_p (loop, LOOP_C_FINITE))
 571               vect_free_loop_info_assumptions (loop);
 572
 573             break;
 574           }
 575
 576         gimple *loop_vectorized_call = vect_loop_vectorized_call (loop);
 577         if (loop_vectorized_call)
 578           set_uid_loop_bbs (loop_vinfo, loop_vectorized_call);
 579         if (LOCATION_LOCUS (vect_location) != UNKNOWN_LOCATION
 580             && dump_enabled_p ())
 581           dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, vect_location,
 582                            "loop vectorized\n");
 583         vect_transform_loop (loop_vinfo);
 584         num_vectorized_loops++;
 585         /* Now that the loop has been vectorized, allow it to be unrolled
 586            etc.  */
 587         loop->force_vectorize = false;
 588
 589         if (loop->simduid)
 590           {
 591             simduid_to_vf *simduid_to_vf_data = XNEW (simduid_to_vf);
 592             if (!simduid_to_vf_htab)
 593               simduid_to_vf_htab = new hash_table<simduid_to_vf> (15);
 594             simduid_to_vf_data->simduid = DECL_UID (loop->simduid);
 595             simduid_to_vf_data->vf = loop_vinfo->vectorization_factor;
 596             *simduid_to_vf_htab->find_slot (simduid_to_vf_data, INSERT)
 597               = simduid_to_vf_data;
 598           }
 599
 600         if (loop_vectorized_call)
 601           {
 602             fold_loop_vectorized_call (loop_vectorized_call, boolean_true_node);
 603             ret |= TODO_cleanup_cfg;
 604           }
 605       }
 606
 607   vect_location = UNKNOWN_LOCATION;
 608
 609   statistics_counter_event (cfun, "Vectorized loops", num_vectorized_loops);
 610   if (dump_enabled_p ()
 611       || (num_vectorized_loops > 0 && dump_enabled_p ()))
 612     dump_printf_loc (MSG_NOTE, vect_location,
 613                      "vectorized %u loops in function.\n",
 614                      num_vectorized_loops);
 615
 616   /*  ----------- Finalize. -----------  */
 617
 618   if (any_ifcvt_loops)
 619     for (i = 1; i < vect_loops_num; i++)
 620       {
 621         loop = get_loop (cfun, i);
 622         if (loop && loop->dont_vectorize)
 623           {
 624             gimple *g = vect_loop_vectorized_call (loop);
 625             if (g)
 626               {
 627                 fold_loop_vectorized_call (g, boolean_false_node);
 628                 ret |= TODO_cleanup_cfg;
 629               }
 630           }
 631       }
 632
 633   for (i = 1; i < vect_loops_num; i++)
 634     {
 635       loop_vec_info loop_vinfo;
 636       bool has_mask_store;
 637
 638       loop = get_loop (cfun, i);
 639       if (!loop)
 640         continue;
 641       loop_vinfo = (loop_vec_info) loop->aux;
 642       has_mask_store = false;
 643       if (loop_vinfo)
 644         has_mask_store = LOOP_VINFO_HAS_MASK_STORE (loop_vinfo);
 645       destroy_loop_vec_info (loop_vinfo, true);
 646       if (has_mask_store)
 647         optimize_mask_stores (loop);
 648       loop->aux = NULL;
 649     }
 650
 651   free_stmt_vec_info_vec ();
 652
 653   /* Fold IFN_GOMP_SIMD_{VF,LANE,LAST_LANE,ORDERED_{START,END}} builtins.  */
 654   if (cfun->has_simduid_loops)
 655     adjust_simduid_builtins (simduid_to_vf_htab);
 656
 657   /* Shrink any "omp array simd" temporary arrays to the
 658      actual vectorization factors.  */
 659   if (simd_array_to_simduid_htab)
 660     shrink_simd_arrays (simd_array_to_simduid_htab, simduid_to_vf_htab);
 661   delete simduid_to_vf_htab;
 662   cfun->has_simduid_loops = false;
 663
 664   if (num_vectorized_loops > 0)
 665     {
 666       /* If we vectorized any loop only virtual SSA form needs to be updated.
 667          ???  Also while we try hard to update loop-closed SSA form we fail
 668          to properly do this in some corner-cases (see PR56286).  */
 669       rewrite_into_loop_closed_ssa (NULL, TODO_update_ssa_only_virtuals);
 670       return TODO_cleanup_cfg;
 671     }
 672
 673   return ret;
 674 }
 675
 676
 677 /* Entry point to the simduid cleanup pass.  */
 678
 679 namespace {
 680
 681 const pass_data pass_data_simduid_cleanup =
 682 {
 683   GIMPLE_PASS, /* type */
 684   "simduid", /* name */
 685   OPTGROUP_NONE, /* optinfo_flags */
 686   TV_NONE, /* tv_id */
 687   ( PROP_ssa | PROP_cfg ), /* properties_required */
 688   0, /* properties_provided */
 689   0, /* properties_destroyed */
 690   0, /* todo_flags_start */
 691   0, /* todo_flags_finish */
 692 };
 693
 694 class pass_simduid_cleanup : public gimple_opt_pass
 695 {
 696 public:
 697   pass_simduid_cleanup (gcc::context *ctxt)
 698     : gimple_opt_pass (pass_data_simduid_cleanup, ctxt)
 699   {}
 700
 701   /* opt_pass methods: */
 702   opt_pass * clone () { return new pass_simduid_cleanup (m_ctxt); }
 703   virtual bool gate (function *fun) { return fun->has_simduid_loops; }
 704   virtual unsigned int execute (function *);
 705
 706 }; // class pass_simduid_cleanup
 707
 708 unsigned int
 709 pass_simduid_cleanup::execute (function *fun)
 710 {
 711   hash_table<simd_array_to_simduid> *simd_array_to_simduid_htab = NULL;
 712
 713   note_simd_array_uses (&simd_array_to_simduid_htab);
 714
 715   /* Fold IFN_GOMP_SIMD_{VF,LANE,LAST_LANE,ORDERED_{START,END}} builtins.  */
 716   adjust_simduid_builtins (NULL);
 717
 718   /* Shrink any "omp array simd" temporary arrays to the
 719      actual vectorization factors.  */
 720   if (simd_array_to_simduid_htab)
 721     shrink_simd_arrays (simd_array_to_simduid_htab, NULL);
 722   fun->has_simduid_loops = false;
 723   return 0;
 724 }
 725
 726 }  // anon namespace
 727
 728 gimple_opt_pass *
 729 make_pass_simduid_cleanup (gcc::context *ctxt)
 730 {
 731   return new pass_simduid_cleanup (ctxt);
 732 }
 733
 734
 735 /*  Entry point to basic block SLP phase.  */
 736
 737 namespace {
 738
 739 const pass_data pass_data_slp_vectorize =
 740 {
 741   GIMPLE_PASS, /* type */
 742   "slp", /* name */
 743   OPTGROUP_LOOP | OPTGROUP_VEC, /* optinfo_flags */
 744   TV_TREE_SLP_VECTORIZATION, /* tv_id */
 745   ( PROP_ssa | PROP_cfg ), /* properties_required */
 746   0, /* properties_provided */
 747   0, /* properties_destroyed */
 748   0, /* todo_flags_start */
 749   TODO_update_ssa, /* todo_flags_finish */
 750 };
 751
 752 class pass_slp_vectorize : public gimple_opt_pass
 753 {
 754 public:
 755   pass_slp_vectorize (gcc::context *ctxt)
 756     : gimple_opt_pass (pass_data_slp_vectorize, ctxt)
 757   {}
 758
 759   /* opt_pass methods: */
 760   opt_pass * clone () { return new pass_slp_vectorize (m_ctxt); }
 761   virtual bool gate (function *) { return flag_tree_slp_vectorize != 0; }
 762   virtual unsigned int execute (function *);
 763
 764 }; // class pass_slp_vectorize
 765
 766 unsigned int
 767 pass_slp_vectorize::execute (function *fun)
 768 {
 769   basic_block bb;
 770
 771   bool in_loop_pipeline = scev_initialized_p ();
 772   if (!in_loop_pipeline)
 773     {
 774       loop_optimizer_init (LOOPS_NORMAL);
 775       scev_initialize ();
 776     }
 777
 778   /* Mark all stmts as not belonging to the current region and unvisited.  */
 779   FOR_EACH_BB_FN (bb, fun)
 780     {
 781       for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi);
 782            gsi_next (&gsi))
 783         {
 784           gimple *stmt = gsi_stmt (gsi);
 785           gimple_set_uid (stmt, -1);
 786           gimple_set_visited (stmt, false);
 787         }
 788     }
 789
 790   init_stmt_vec_info_vec ();
 791
 792   FOR_EACH_BB_FN (bb, fun)
 793     {
 794       if (vect_slp_bb (bb))
 795         dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, vect_location,
 796                          "basic block vectorized\n");
 797     }
 798
 799   free_stmt_vec_info_vec ();
 800
 801   if (!in_loop_pipeline)
 802     {
 803       scev_finalize ();
 804       loop_optimizer_finalize ();
 805     }
 806
 807   return 0;
 808 }
 809
 810 } // anon namespace
 811
 812 gimple_opt_pass *
 813 make_pass_slp_vectorize (gcc::context *ctxt)
 814 {
 815   return new pass_slp_vectorize (ctxt);
 816 }
 817
 818
 819 /* Increase alignment of global arrays to improve vectorization potential.
 820    TODO:
 821    - Consider also structs that have an array field.
 822    - Use ipa analysis to prune arrays that can't be vectorized?
 823      This should involve global alignment analysis and in the future also
 824      array padding.  */
 825
 826 static unsigned get_vec_alignment_for_type (tree);
 827 static hash_map<tree, unsigned> *type_align_map;
 828
 829 /* Return alignment of array's vector type corresponding to scalar type.
 830    0 if no vector type exists.  */
 831 static unsigned
 832 get_vec_alignment_for_array_type (tree type)
 833 {
 834   gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
 835
 836   tree vectype = get_vectype_for_scalar_type (strip_array_types (type));
 837   if (!vectype
 838       || !TYPE_SIZE (type)
 839       || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST
 840       || tree_int_cst_lt (TYPE_SIZE (type), TYPE_SIZE (vectype)))
 841     return 0;
 842
 843   return TYPE_ALIGN (vectype);
 844 }
 845
 846 /* Return alignment of field having maximum alignment of vector type
 847    corresponding to it's scalar type. For now, we only consider fields whose
 848    offset is a multiple of it's vector alignment.
 849    0 if no suitable field is found.  */
 850 static unsigned
 851 get_vec_alignment_for_record_type (tree type)
 852 {
 853   gcc_assert (TREE_CODE (type) == RECORD_TYPE);
 854
 855   unsigned max_align = 0, alignment;
 856   HOST_WIDE_INT offset;
 857   tree offset_tree;
 858
 859   if (TYPE_PACKED (type))
 860     return 0;
 861
 862   unsigned *slot = type_align_map->get (type);
 863   if (slot)
 864     return *slot;
 865
 866   for (tree field = first_field (type);
 867        field != NULL_TREE;
 868        field = DECL_CHAIN (field))
 869     {
 870       /* Skip if not FIELD_DECL or if alignment is set by user.  */
 871       if (TREE_CODE (field) != FIELD_DECL
 872           || DECL_USER_ALIGN (field)
 873           || DECL_ARTIFICIAL (field))
 874         continue;
 875
 876       /* We don't need to process the type further if offset is variable,
 877          since the offsets of remaining members will also be variable.  */
 878       if (TREE_CODE (DECL_FIELD_OFFSET (field)) != INTEGER_CST
 879           || TREE_CODE (DECL_FIELD_BIT_OFFSET (field)) != INTEGER_CST)
 880         break;
 881
 882       /* Similarly stop processing the type if offset_tree
 883          does not fit in unsigned HOST_WIDE_INT.  */
 884       offset_tree = bit_position (field);
 885       if (!tree_fits_uhwi_p (offset_tree))
 886         break;
 887
 888       offset = tree_to_uhwi (offset_tree);
 889       alignment = get_vec_alignment_for_type (TREE_TYPE (field));
 890
 891       /* Get maximum alignment of vectorized field/array among those members
 892          whose offset is multiple of the vector alignment.  */
 893       if (alignment
 894           && (offset % alignment == 0)
 895           && (alignment > max_align))
 896         max_align = alignment;
 897     }
 898
 899   type_align_map->put (type, max_align);
 900   return max_align;
 901 }
 902
 903 /* Return alignment of vector type corresponding to decl's scalar type
 904    or 0 if it doesn't exist or the vector alignment is lesser than
 905    decl's alignment.  */
 906 static unsigned
 907 get_vec_alignment_for_type (tree type)
 908 {
 909   if (type == NULL_TREE)
 910     return 0;
 911
 912   gcc_assert (TYPE_P (type));
 913
 914   static unsigned alignment = 0;
 915   switch (TREE_CODE (type))
 916     {
 917       case ARRAY_TYPE:
 918         alignment = get_vec_alignment_for_array_type (type);
 919         break;
 920       case RECORD_TYPE:
 921         alignment = get_vec_alignment_for_record_type (type);
 922         break;
 923       default:
 924         alignment = 0;
 925         break;
 926     }
 927
 928   return (alignment > TYPE_ALIGN (type)) ? alignment : 0;
 929 }
 930
 931 /* Entry point to increase_alignment pass.  */
 932 static unsigned int
 933 increase_alignment (void)
 934 {
 935   varpool_node *vnode;
 936
 937   vect_location = UNKNOWN_LOCATION;
 938   type_align_map = new hash_map<tree, unsigned>;
 939
 940   /* Increase the alignment of all global arrays for vectorization.  */
 941   FOR_EACH_DEFINED_VARIABLE (vnode)
 942     {
 943       tree decl = vnode->decl;
 944       unsigned int alignment;
 945
 946       if ((decl_in_symtab_p (decl)
 947           && !symtab_node::get (decl)->can_increase_alignment_p ())
 948           || DECL_USER_ALIGN (decl) || DECL_ARTIFICIAL (decl))
 949         continue;
 950
 951       alignment = get_vec_alignment_for_type (TREE_TYPE (decl));
 952       if (alignment && vect_can_force_dr_alignment_p (decl, alignment))
 953         {
 954           vnode->increase_alignment (alignment);
 955           dump_printf (MSG_NOTE, "Increasing alignment of decl: ");
 956           dump_generic_expr (MSG_NOTE, TDF_SLIM, decl);
 957           dump_printf (MSG_NOTE, "\n");
 958         }
 959     }
 960
 961   delete type_align_map;
 962   return 0;
 963 }
 964
 965
 966 namespace {
 967
 968 const pass_data pass_data_ipa_increase_alignment =
 969 {
 970   SIMPLE_IPA_PASS, /* type */
 971   "increase_alignment", /* name */
 972   OPTGROUP_LOOP | OPTGROUP_VEC, /* optinfo_flags */
 973   TV_IPA_OPT, /* tv_id */
 974   0, /* properties_required */
 975   0, /* properties_provided */
 976   0, /* properties_destroyed */
 977   0, /* todo_flags_start */
 978   0, /* todo_flags_finish */
 979 };
 980
 981 class pass_ipa_increase_alignment : public simple_ipa_opt_pass
 982 {
 983 public:
 984   pass_ipa_increase_alignment (gcc::context *ctxt)
 985     : simple_ipa_opt_pass (pass_data_ipa_increase_alignment, ctxt)
 986   {}
 987
 988   /* opt_pass methods: */
 989   virtual bool gate (function *)
 990     {
 991       return flag_section_anchors && flag_tree_loop_vectorize;
 992     }
 993
 994   virtual unsigned int execute (function *) { return increase_alignment (); }
 995
 996 }; // class pass_ipa_increase_alignment
 997
 998 } // anon namespace
 999
1000 simple_ipa_opt_pass *
1001 make_pass_ipa_increase_alignment (gcc::context *ctxt)
1002 {
1003   return new pass_ipa_increase_alignment (ctxt);
1004 }