gcc/graphite-poly.c

   1 /* Graphite polyhedral representation.
   2    Copyright (C) 2009 Free Software Foundation, Inc.
   3    Contributed by Sebastian Pop <sebastian.pop@amd.com> and
   4    Tobias Grosser <grosser@fim.uni-passau.de>.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "tm.h"
  25 #include "ggc.h"
  26 #include "tree.h"
  27 #include "rtl.h"
  28 #include "output.h"
  29 #include "basic-block.h"
  30 #include "diagnostic.h"
  31 #include "tree-flow.h"
  32 #include "toplev.h"
  33 #include "tree-dump.h"
  34 #include "timevar.h"
  35 #include "cfgloop.h"
  36 #include "tree-chrec.h"
  37 #include "tree-data-ref.h"
  38 #include "tree-scalar-evolution.h"
  39 #include "tree-pass.h"
  40 #include "domwalk.h"
  41 #include "value-prof.h"
  42 #include "pointer-set.h"
  43 #include "gimple.h"
  44 #include "params.h"
  45
  46 #ifdef HAVE_cloog
  47 #include "cloog/cloog.h"
  48 #include "ppl_c.h"
  49 #include "sese.h"
  50 #include "graphite-ppl.h"
  51 #include "graphite.h"
  52 #include "graphite-poly.h"
  53 #include "graphite-dependences.h"
  54
  55 /* Return the maximal loop depth in SCOP.  */
  56
  57 int
  58 scop_max_loop_depth (scop_p scop)
  59 {
  60   int i;
  61   poly_bb_p pbb;
  62   int max_nb_loops = 0;
  63
  64   for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
  65     {
  66       int nb_loops = pbb_dim_iter_domain (pbb);
  67       if (max_nb_loops < nb_loops)
  68         max_nb_loops = nb_loops;
  69     }
  70
  71   return max_nb_loops;
  72 }
  73
  74 /* Extend the scattering matrix of PBB to MAX_SCATTERING scattering
  75    dimensions.  */
  76
  77 static void
  78 extend_scattering (poly_bb_p pbb, int max_scattering)
  79 {
  80   ppl_dimension_type nb_old_dims, nb_new_dims;
  81   int nb_added_dims, i;
  82   ppl_Coefficient_t coef;
  83   Value one;
  84
  85   nb_added_dims = max_scattering - pbb_nb_scattering_transform (pbb);
  86   value_init (one);
  87   value_set_si (one, 1);
  88   ppl_new_Coefficient (&coef);
  89   ppl_assign_Coefficient_from_mpz_t (coef, one);
  90
  91   gcc_assert (nb_added_dims >= 0);
  92
  93   nb_old_dims = pbb_nb_scattering_transform (pbb) + pbb_dim_iter_domain (pbb)
  94     + scop_nb_params (PBB_SCOP (pbb));
  95   nb_new_dims = nb_old_dims + nb_added_dims;
  96
  97   ppl_insert_dimensions (PBB_TRANSFORMED_SCATTERING (pbb),
  98                          pbb_nb_scattering_transform (pbb), nb_added_dims);
  99   PBB_NB_SCATTERING_TRANSFORM (pbb) += nb_added_dims;
 100
 101   /* Add identity matrix for the added dimensions.  */
 102   for (i = max_scattering - nb_added_dims; i < max_scattering; i++)
 103     {
 104       ppl_Constraint_t cstr;
 105       ppl_Linear_Expression_t expr;
 106
 107       ppl_new_Linear_Expression_with_dimension (&expr, nb_new_dims);
 108       ppl_Linear_Expression_add_to_coefficient (expr, i, coef);
 109       ppl_new_Constraint (&cstr, expr, PPL_CONSTRAINT_TYPE_EQUAL);
 110       ppl_Polyhedron_add_constraint (PBB_TRANSFORMED_SCATTERING (pbb), cstr);
 111       ppl_delete_Constraint (cstr);
 112       ppl_delete_Linear_Expression (expr);
 113     }
 114
 115   ppl_delete_Coefficient (coef);
 116   value_clear (one);
 117 }
 118
 119 /* All scattering matrices in SCOP will have the same number of scattering
 120    dimensions.  */
 121
 122 int
 123 unify_scattering_dimensions (scop_p scop)
 124 {
 125   int i;
 126   poly_bb_p pbb;
 127   graphite_dim_t max_scattering = 0;
 128
 129   for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
 130     max_scattering = MAX (pbb_nb_scattering_transform (pbb), max_scattering);
 131
 132   for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
 133     extend_scattering (pbb, max_scattering);
 134
 135   return max_scattering;
 136 }
 137
 138 /* Prints to FILE the scattering function of PBB.  */
 139
 140 void
 141 print_scattering_function (FILE *file, poly_bb_p pbb)
 142 {
 143   graphite_dim_t i;
 144
 145   if (!PBB_TRANSFORMED (pbb))
 146     return;
 147
 148   fprintf (file, "scattering bb_%d (\n", pbb_index (pbb));
 149   fprintf (file, "#  eq");
 150
 151   for (i = 0; i < pbb_nb_scattering_transform (pbb); i++)
 152     fprintf (file, "     s%d", (int) i);
 153
 154   for (i = 0; i < pbb_nb_local_vars (pbb); i++)
 155     fprintf (file, "    lv%d", (int) i);
 156
 157   for (i = 0; i < pbb_dim_iter_domain (pbb); i++)
 158     fprintf (file, "     i%d", (int) i);
 159
 160   for (i = 0; i < pbb_nb_params (pbb); i++)
 161     fprintf (file, "     p%d", (int) i);
 162
 163   fprintf (file, "    cst\n");
 164
 165   ppl_print_polyhedron_matrix (file, PBB_TRANSFORMED_SCATTERING (pbb));
 166
 167   fprintf (file, ")\n");
 168 }
 169
 170 /* Prints to FILE the iteration domain of PBB.  */
 171
 172 void
 173 print_iteration_domain (FILE *file, poly_bb_p pbb)
 174 {
 175   print_pbb_domain (file, pbb);
 176 }
 177
 178 /* Prints to FILE the scattering functions of every PBB of SCOP.  */
 179
 180 void
 181 print_scattering_functions (FILE *file, scop_p scop)
 182 {
 183   int i;
 184   poly_bb_p pbb;
 185
 186   for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
 187     print_scattering_function (file, pbb);
 188 }
 189
 190 /* Prints to FILE the iteration domains of every PBB of SCOP.  */
 191
 192 void
 193 print_iteration_domains (FILE *file, scop_p scop)
 194 {
 195   int i;
 196   poly_bb_p pbb;
 197
 198   for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
 199     print_iteration_domain (file, pbb);
 200 }
 201
 202 /* Prints to STDERR the scattering function of PBB.  */
 203
 204 void
 205 debug_scattering_function (poly_bb_p pbb)
 206 {
 207   print_scattering_function (stderr, pbb);
 208 }
 209
 210 /* Prints to STDERR the iteration domain of PBB.  */
 211
 212 void
 213 debug_iteration_domain (poly_bb_p pbb)
 214 {
 215   print_iteration_domain (stderr, pbb);
 216 }
 217
 218 /* Prints to STDERR the scattering functions of every PBB of SCOP.  */
 219
 220 void
 221 debug_scattering_functions (scop_p scop)
 222 {
 223   print_scattering_functions (stderr, scop);
 224 }
 225
 226 /* Prints to STDERR the iteration domains of every PBB of SCOP.  */
 227
 228 void
 229 debug_iteration_domains (scop_p scop)
 230 {
 231   print_iteration_domains (stderr, scop);
 232 }
 233
 234 /* Apply graphite transformations to all the basic blocks of SCOP.  */
 235
 236 bool
 237 apply_poly_transforms (scop_p scop)
 238 {
 239   bool transform_done = false;
 240
 241   /* Generate code even if we did not apply any real transformation.
 242      This also allows to check the performance for the identity
 243      transformation: GIMPLE -> GRAPHITE -> GIMPLE
 244      Keep in mind that CLooG optimizes in control, so the loop structure
 245      may change, even if we only use -fgraphite-identity.  */
 246   if (flag_graphite_identity)
 247     transform_done = true;
 248
 249   if (flag_loop_parallelize_all)
 250     transform_done = true;
 251
 252   if (flag_loop_block)
 253     {
 254       transform_done |= scop_do_strip_mine (scop);
 255       transform_done |= scop_do_interchange (scop);
 256     }
 257   else
 258     {
 259       if (flag_loop_strip_mine)
 260         transform_done |= scop_do_strip_mine (scop);
 261
 262       if (flag_loop_interchange)
 263         transform_done |= scop_do_interchange (scop);
 264     }
 265
 266   return transform_done;
 267 }
 268
 269 /* Returns true when it PDR1 is a duplicate of PDR2: same PBB, and
 270    their ACCESSES, TYPE, and NB_SUBSCRIPTS are the same.  */
 271
 272 static inline bool
 273 can_collapse_pdrs (poly_dr_p pdr1, poly_dr_p pdr2)
 274 {
 275   bool res;
 276   ppl_Pointset_Powerset_C_Polyhedron_t af1, af2, diff;
 277
 278   if (PDR_PBB (pdr1) != PDR_PBB (pdr2)
 279       || PDR_NB_SUBSCRIPTS (pdr1) != PDR_NB_SUBSCRIPTS (pdr2)
 280       || PDR_TYPE (pdr1) != PDR_TYPE (pdr2))
 281     return false;
 282
 283   af1 = PDR_ACCESSES (pdr1);
 284   af2 = PDR_ACCESSES (pdr2);
 285   ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
 286     (&diff, af1);
 287   ppl_Pointset_Powerset_C_Polyhedron_difference_assign (diff, af2);
 288
 289   res = ppl_Pointset_Powerset_C_Polyhedron_is_empty (diff);
 290   ppl_delete_Pointset_Powerset_C_Polyhedron (diff);
 291   return res;
 292 }
 293
 294 /* Removes duplicated data references in PBB.  */
 295
 296 void
 297 pbb_remove_duplicate_pdrs (poly_bb_p pbb)
 298 {
 299   int i, j;
 300   poly_dr_p pdr1, pdr2;
 301   unsigned n = VEC_length (poly_dr_p, PBB_DRS (pbb));
 302   VEC (poly_dr_p, heap) *collapsed = VEC_alloc (poly_dr_p, heap, n);
 303
 304   for (i = 0; VEC_iterate (poly_dr_p, PBB_DRS (pbb), i, pdr1); i++)
 305     for (j = 0; VEC_iterate (poly_dr_p, collapsed, j, pdr2); j++)
 306       if (!can_collapse_pdrs (pdr1, pdr2))
 307         VEC_quick_push (poly_dr_p, collapsed, pdr1);
 308
 309   PBB_PDR_DUPLICATES_REMOVED (pbb) = true;
 310 }
 311
 312 /* Create a new polyhedral data reference and add it to PBB.  It is
 313    defined by its ACCESSES, its TYPE, and the number of subscripts
 314    NB_SUBSCRIPTS.  */
 315
 316 void
 317 new_poly_dr (poly_bb_p pbb, int dr_base_object_set,
 318              ppl_Pointset_Powerset_C_Polyhedron_t accesses,
 319              enum poly_dr_type type, void *cdr, graphite_dim_t nb_subscripts)
 320 {
 321   static int id = 0;
 322   poly_dr_p pdr = XNEW (struct poly_dr);
 323
 324   PDR_ID (pdr) = id++;
 325   PDR_BASE_OBJECT_SET (pdr) = dr_base_object_set;
 326   PDR_NB_REFS (pdr) = 1;
 327   PDR_PBB (pdr) = pbb;
 328   PDR_ACCESSES (pdr) = accesses;
 329   PDR_TYPE (pdr) = type;
 330   PDR_CDR (pdr) = cdr;
 331   PDR_NB_SUBSCRIPTS (pdr) = nb_subscripts;
 332   VEC_safe_push (poly_dr_p, heap, PBB_DRS (pbb), pdr);
 333 }
 334
 335 /* Free polyhedral data reference PDR.  */
 336
 337 void
 338 free_poly_dr (poly_dr_p pdr)
 339 {
 340   ppl_delete_Pointset_Powerset_C_Polyhedron (PDR_ACCESSES (pdr));
 341   XDELETE (pdr);
 342 }
 343
 344 /* Create a new polyhedral black box.  */
 345
 346 void
 347 new_poly_bb (scop_p scop, void *black_box, bool reduction)
 348 {
 349   poly_bb_p pbb = XNEW (struct poly_bb);
 350
 351   PBB_DOMAIN (pbb) = NULL;
 352   PBB_SCOP (pbb) = scop;
 353   pbb_set_black_box (pbb, black_box);
 354   PBB_TRANSFORMED (pbb) = NULL;
 355   PBB_SAVED (pbb) = NULL;
 356   PBB_ORIGINAL (pbb) = NULL;
 357   PBB_DRS (pbb) = VEC_alloc (poly_dr_p, heap, 3);
 358   PBB_IS_REDUCTION (pbb) = reduction;
 359   PBB_PDR_DUPLICATES_REMOVED (pbb) = false;
 360   VEC_safe_push (poly_bb_p, heap, SCOP_BBS (scop), pbb);
 361 }
 362
 363 /* Free polyhedral black box.  */
 364
 365 void
 366 free_poly_bb (poly_bb_p pbb)
 367 {
 368   int i;
 369   poly_dr_p pdr;
 370
 371   ppl_delete_Pointset_Powerset_C_Polyhedron (PBB_DOMAIN (pbb));
 372
 373   if (PBB_TRANSFORMED (pbb))
 374     poly_scattering_free (PBB_TRANSFORMED (pbb));
 375
 376   if (PBB_SAVED (pbb))
 377     poly_scattering_free (PBB_SAVED (pbb));
 378
 379   if (PBB_ORIGINAL (pbb))
 380     poly_scattering_free (PBB_ORIGINAL (pbb));
 381
 382   if (PBB_DRS (pbb))
 383     for (i = 0; VEC_iterate (poly_dr_p, PBB_DRS (pbb), i, pdr); i++)
 384       free_poly_dr (pdr);
 385
 386   VEC_free (poly_dr_p, heap, PBB_DRS (pbb));
 387   XDELETE (pbb);
 388 }
 389
 390 static void
 391 print_pdr_access_layout (FILE *file, poly_dr_p pdr)
 392 {
 393   graphite_dim_t i;
 394
 395   fprintf (file, "#  eq");
 396
 397   for (i = 0; i < pdr_dim_iter_domain (pdr); i++)
 398     fprintf (file, "     i%d", (int) i);
 399
 400   for (i = 0; i < pdr_nb_params (pdr); i++)
 401     fprintf (file, "     p%d", (int) i);
 402
 403   fprintf (file, "  alias");
 404
 405   for (i = 0; i < PDR_NB_SUBSCRIPTS (pdr); i++)
 406     fprintf (file, "   sub%d", (int) i);
 407
 408   fprintf (file, "    cst\n");
 409 }
 410
 411 /* Prints to FILE the polyhedral data reference PDR.  */
 412
 413 void
 414 print_pdr (FILE *file, poly_dr_p pdr)
 415 {
 416   fprintf (file, "pdr_%d (", PDR_ID (pdr));
 417
 418   switch (PDR_TYPE (pdr))
 419     {
 420     case PDR_READ:
 421       fprintf (file, "read \n");
 422       break;
 423
 424     case PDR_WRITE:
 425       fprintf (file, "write \n");
 426       break;
 427
 428     case PDR_MAY_WRITE:
 429       fprintf (file, "may_write \n");
 430       break;
 431
 432     default:
 433       gcc_unreachable ();
 434     }
 435
 436   dump_data_reference (file, (data_reference_p) PDR_CDR (pdr));
 437
 438   fprintf (file, "data accesses (\n");
 439   print_pdr_access_layout (file, pdr);
 440   ppl_print_powerset_matrix (file, PDR_ACCESSES (pdr));
 441   fprintf (file, ")\n");
 442
 443   fprintf (file, ")\n");
 444 }
 445
 446 /* Prints to STDERR the polyhedral data reference PDR.  */
 447
 448 void
 449 debug_pdr (poly_dr_p pdr)
 450 {
 451   print_pdr (stderr, pdr);
 452 }
 453
 454 /* Creates a new SCOP containing REGION.  */
 455
 456 scop_p
 457 new_scop (void *region)
 458 {
 459   scop_p scop = XNEW (struct scop);
 460
 461   SCOP_CONTEXT (scop) = NULL;
 462   scop_set_region (scop, region);
 463   SCOP_BBS (scop) = VEC_alloc (poly_bb_p, heap, 3);
 464   SCOP_ORIGINAL_PDDRS (scop) = htab_create (10, hash_poly_ddr_p,
 465                                             eq_poly_ddr_p, free_poly_ddr);
 466   return scop;
 467 }
 468
 469 /* Deletes SCOP.  */
 470
 471 void
 472 free_scop (scop_p scop)
 473 {
 474   int i;
 475   poly_bb_p pbb;
 476
 477   for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
 478     free_poly_bb (pbb);
 479
 480   VEC_free (poly_bb_p, heap, SCOP_BBS (scop));
 481
 482   if (SCOP_CONTEXT (scop))
 483     ppl_delete_Pointset_Powerset_C_Polyhedron (SCOP_CONTEXT (scop));
 484
 485   htab_delete (SCOP_ORIGINAL_PDDRS (scop));
 486   XDELETE (scop);
 487 }
 488
 489 /* Print to FILE the domain of PBB.  */
 490
 491 void
 492 print_pbb_domain (FILE *file, poly_bb_p pbb)
 493 {
 494   graphite_dim_t i;
 495   gimple_bb_p gbb = PBB_BLACK_BOX (pbb);
 496
 497   if (!PBB_DOMAIN (pbb))
 498     return;
 499
 500   fprintf (file, "domains bb_%d (\n", GBB_BB (gbb)->index);
 501   fprintf (file, "#  eq");
 502
 503   for (i = 0; i < pbb_dim_iter_domain (pbb); i++)
 504     fprintf (file, "     i%d", (int) i);
 505
 506   for (i = 0; i < pbb_nb_params (pbb); i++)
 507     fprintf (file, "     p%d", (int) i);
 508
 509   fprintf (file, "    cst\n");
 510
 511   if (PBB_DOMAIN (pbb))
 512     ppl_print_powerset_matrix (file, PBB_DOMAIN (pbb));
 513
 514   fprintf (file, ")\n");
 515 }
 516
 517 /* Dump the cases of a graphite basic block GBB on FILE.  */
 518
 519 static void
 520 dump_gbb_cases (FILE *file, gimple_bb_p gbb)
 521 {
 522   int i;
 523   gimple stmt;
 524   VEC (gimple, heap) *cases;
 525
 526   if (!gbb)
 527     return;
 528
 529   cases = GBB_CONDITION_CASES (gbb);
 530   if (VEC_empty (gimple, cases))
 531     return;
 532
 533   fprintf (file, "cases bb_%d (", GBB_BB (gbb)->index);
 534
 535   for (i = 0; VEC_iterate (gimple, cases, i, stmt); i++)
 536     print_gimple_stmt (file, stmt, 0, 0);
 537
 538   fprintf (file, ")\n");
 539 }
 540
 541 /* Dump conditions of a graphite basic block GBB on FILE.  */
 542
 543 static void
 544 dump_gbb_conditions (FILE *file, gimple_bb_p gbb)
 545 {
 546   int i;
 547   gimple stmt;
 548   VEC (gimple, heap) *conditions;
 549
 550   if (!gbb)
 551     return;
 552
 553   conditions = GBB_CONDITIONS (gbb);
 554   if (VEC_empty (gimple, conditions))
 555     return;
 556
 557   fprintf (file, "conditions bb_%d (", GBB_BB (gbb)->index);
 558
 559   for (i = 0; VEC_iterate (gimple, conditions, i, stmt); i++)
 560     print_gimple_stmt (file, stmt, 0, 0);
 561
 562   fprintf (file, ")\n");
 563 }
 564
 565 /* Print to FILE all the data references of PBB.  */
 566
 567 void
 568 print_pdrs (FILE *file, poly_bb_p pbb)
 569 {
 570   int i;
 571   poly_dr_p pdr;
 572
 573   for (i = 0; VEC_iterate (poly_dr_p, PBB_DRS (pbb), i, pdr); i++)
 574     print_pdr (file, pdr);
 575 }
 576
 577 /* Print to STDERR all the data references of PBB.  */
 578
 579 void
 580 debug_pdrs (poly_bb_p pbb)
 581 {
 582   print_pdrs (stderr, pbb);
 583 }
 584
 585 /* Print to FILE the domain and scattering function of PBB.  */
 586
 587 void
 588 print_pbb (FILE *file, poly_bb_p pbb)
 589 {
 590   fprintf (file, "pbb_%d (\n", pbb_index (pbb));
 591   dump_gbb_conditions (file, PBB_BLACK_BOX (pbb));
 592   dump_gbb_cases (file, PBB_BLACK_BOX (pbb));
 593   print_pdrs (file, pbb);
 594   print_pbb_domain (file, pbb);
 595   print_scattering_function (file, pbb);
 596   fprintf (file, ")\n");
 597 }
 598
 599 /* Print to FILE the parameters of SCOP.  */
 600
 601 void
 602 print_scop_params (FILE *file, scop_p scop)
 603 {
 604   int i;
 605   tree t;
 606
 607   fprintf (file, "parameters (\n");
 608   for (i = 0; VEC_iterate (tree, SESE_PARAMS (SCOP_REGION (scop)), i, t); i++)
 609     {
 610       fprintf (file, "p_%d -> ", i);
 611       print_generic_expr (file, t, 0);
 612       fprintf (file, "\n");
 613     }
 614   fprintf (file, ")\n");
 615 }
 616
 617 /* Print to FILE the context of SCoP.  */
 618 void
 619 print_scop_context (FILE *file, scop_p scop)
 620 {
 621   graphite_dim_t i;
 622
 623   fprintf (file, "context (\n");
 624   fprintf (file, "#  eq");
 625
 626   for (i = 0; i < scop_nb_params (scop); i++)
 627     fprintf (file, "     p%d", (int) i);
 628
 629   fprintf (file, "    cst\n");
 630
 631   if (SCOP_CONTEXT (scop))
 632     ppl_print_powerset_matrix (file, SCOP_CONTEXT (scop));
 633
 634   fprintf (file, ")\n");
 635 }
 636
 637 /* Print to FILE the SCOP.  */
 638
 639 void
 640 print_scop (FILE *file, scop_p scop)
 641 {
 642   int i;
 643   poly_bb_p pbb;
 644
 645   fprintf (file, "scop (\n");
 646   print_scop_params (file, scop);
 647   print_scop_context (file, scop);
 648
 649   for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
 650     print_pbb (file, pbb);
 651
 652   fprintf (file, "original_lst (\n");
 653   print_lst (file, SCOP_ORIGINAL_SCHEDULE (scop), 0);
 654   fprintf (file, ")\n");
 655
 656   fprintf (file, "transformed_lst (\n");
 657   print_lst (file, SCOP_TRANSFORMED_SCHEDULE (scop), 0);
 658   fprintf (file, ")\n");
 659
 660   fprintf (file, ")\n");
 661 }
 662
 663 /* Print to STDERR the domain of PBB.  */
 664
 665 void
 666 debug_pbb_domain (poly_bb_p pbb)
 667 {
 668   print_pbb_domain (stderr, pbb);
 669 }
 670
 671 /* Print to FILE the domain and scattering function of PBB.  */
 672
 673 void
 674 debug_pbb (poly_bb_p pbb)
 675 {
 676   print_pbb (stderr, pbb);
 677 }
 678
 679 /* Print to STDERR the context of SCOP.  */
 680
 681 void
 682 debug_scop_context (scop_p scop)
 683 {
 684   print_scop_context (stderr, scop);
 685 }
 686
 687 /* Print to STDERR the SCOP.  */
 688
 689 void
 690 debug_scop (scop_p scop)
 691 {
 692   print_scop (stderr, scop);
 693 }
 694
 695 /* Print to STDERR the parameters of SCOP.  */
 696
 697 void
 698 debug_scop_params (scop_p scop)
 699 {
 700   print_scop_params (stderr, scop);
 701 }
 702
 703
 704 /* The dimension in the transformed scattering polyhedron of PBB
 705    containing the scattering iterator for the loop at depth LOOP_DEPTH.  */
 706
 707 ppl_dimension_type
 708 psct_scattering_dim_for_loop_depth (poly_bb_p pbb, graphite_dim_t loop_depth)
 709 {
 710   ppl_const_Constraint_System_t pcs;
 711   ppl_Constraint_System_const_iterator_t cit, cend;
 712   ppl_const_Constraint_t cstr;
 713   ppl_Polyhedron_t ph = PBB_TRANSFORMED_SCATTERING (pbb);
 714   ppl_dimension_type iter = psct_iterator_dim (pbb, loop_depth);
 715   ppl_Linear_Expression_t expr;
 716   ppl_Coefficient_t coef;
 717   Value val;
 718   graphite_dim_t i;
 719
 720   value_init (val);
 721   ppl_new_Coefficient (&coef);
 722   ppl_Polyhedron_get_constraints (ph, &pcs);
 723   ppl_new_Constraint_System_const_iterator (&cit);
 724   ppl_new_Constraint_System_const_iterator (&cend);
 725
 726   for (ppl_Constraint_System_begin (pcs, cit),
 727          ppl_Constraint_System_end (pcs, cend);
 728        !ppl_Constraint_System_const_iterator_equal_test (cit, cend);
 729        ppl_Constraint_System_const_iterator_increment (cit))
 730     {
 731       ppl_Constraint_System_const_iterator_dereference (cit, &cstr);
 732       ppl_new_Linear_Expression_from_Constraint (&expr, cstr);
 733       ppl_Linear_Expression_coefficient (expr, iter, coef);
 734       ppl_Coefficient_to_mpz_t (coef, val);
 735
 736       if (value_zero_p (val))
 737         {
 738           ppl_delete_Linear_Expression (expr);
 739           continue;
 740         }
 741
 742       for (i = 0; i < pbb_nb_scattering_transform (pbb); i++)
 743         {
 744           ppl_dimension_type scatter = psct_scattering_dim (pbb, i);
 745
 746           ppl_Linear_Expression_coefficient (expr, scatter, coef);
 747           ppl_Coefficient_to_mpz_t (coef, val);
 748
 749           if (value_notzero_p (val))
 750             {
 751               value_clear (val);
 752               ppl_delete_Linear_Expression (expr);
 753               ppl_delete_Coefficient (coef);
 754               ppl_delete_Constraint_System_const_iterator (cit);
 755               ppl_delete_Constraint_System_const_iterator (cend);
 756
 757               return scatter;
 758             }
 759         }
 760     }
 761
 762   gcc_unreachable ();
 763 }
 764
 765 /* Returns the number of iterations NITER of the loop around PBB at
 766    depth LOOP_DEPTH.  */
 767
 768 void
 769 pbb_number_of_iterations (poly_bb_p pbb,
 770                           graphite_dim_t loop_depth,
 771                           Value niter)
 772 {
 773   ppl_Linear_Expression_t le;
 774   ppl_dimension_type dim;
 775
 776   ppl_Pointset_Powerset_C_Polyhedron_space_dimension (PBB_DOMAIN (pbb), &dim);
 777   ppl_new_Linear_Expression_with_dimension (&le, dim);
 778   ppl_set_coef (le, pbb_iterator_dim (pbb, loop_depth), 1);
 779   value_set_si (niter, -1);
 780   ppl_max_for_le_pointset (PBB_DOMAIN (pbb), le, niter);
 781   ppl_delete_Linear_Expression (le);
 782 }
 783
 784 /* Returns the number of iterations NITER of the loop around PBB at
 785    time(scattering) dimension TIME_DEPTH.  */
 786
 787 void
 788 pbb_number_of_iterations_at_time (poly_bb_p pbb,
 789                                   graphite_dim_t time_depth,
 790                                   Value niter)
 791 {
 792   ppl_Pointset_Powerset_C_Polyhedron_t ext_domain, sctr;
 793   ppl_Linear_Expression_t le;
 794   ppl_dimension_type dim;
 795
 796   /* Takes together domain and scattering polyhedrons, and composes
 797      them into the bigger polyhedron that has the following format:
 798
 799      t0..t_{n-1} | l0..l_{nlcl-1} | i0..i_{niter-1} | g0..g_{nparm-1}
 800
 801      where
 802      | t0..t_{n-1} are time dimensions (scattering dimensions)
 803      | l0..l_{nclc-1} are local variables in scattering function
 804      | i0..i_{niter-1} are original iteration variables
 805      | g0..g_{nparam-1} are global parameters.  */
 806
 807   ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron (&sctr,
 808       PBB_TRANSFORMED_SCATTERING (pbb));
 809
 810   /* Extend the iteration domain with the scattering dimensions:
 811      0..0 | 0..0 | i0..i_{niter-1} | g0..g_{nparm-1}.   */
 812   ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
 813     (&ext_domain, PBB_DOMAIN (pbb));
 814   ppl_insert_dimensions_pointset (ext_domain, 0,
 815                                   pbb_nb_scattering_transform (pbb)
 816                                   + pbb_nb_local_vars (pbb));
 817
 818   /* Add to sctr the extended domain.  */
 819   ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (sctr, ext_domain);
 820
 821   /* Extract the number of iterations.  */
 822   ppl_Pointset_Powerset_C_Polyhedron_space_dimension (sctr, &dim);
 823   ppl_new_Linear_Expression_with_dimension (&le, dim);
 824   ppl_set_coef (le, time_depth, 1);
 825   value_set_si (niter, -1);
 826   ppl_max_for_le_pointset (sctr, le, niter);
 827
 828   ppl_delete_Linear_Expression (le);
 829   ppl_delete_Pointset_Powerset_C_Polyhedron (sctr);
 830   ppl_delete_Pointset_Powerset_C_Polyhedron (ext_domain);
 831 }
 832
 833 /* Translates LOOP to LST.  */
 834
 835 static lst_p
 836 loop_to_lst (loop_p loop, VEC (poly_bb_p, heap) *bbs, int *i)
 837 {
 838   poly_bb_p pbb;
 839   VEC (lst_p, heap) *seq = VEC_alloc (lst_p, heap, 5);
 840
 841   for (; VEC_iterate (poly_bb_p, bbs, *i, pbb); (*i)++)
 842     {
 843       lst_p stmt;
 844       basic_block bb = GBB_BB (PBB_BLACK_BOX (pbb));
 845
 846       if (bb->loop_father == loop)
 847         stmt = new_lst_stmt (pbb);
 848       else if (flow_bb_inside_loop_p (loop, bb))
 849         {
 850           loop_p next = loop->inner;
 851
 852           while (next && !flow_bb_inside_loop_p (next, bb))
 853             next = next->next;
 854
 855           stmt = loop_to_lst (next, bbs, i);
 856         }
 857       else
 858         {
 859           (*i)--;
 860           return new_lst_loop (seq);
 861         }
 862
 863       VEC_safe_push (lst_p, heap, seq, stmt);
 864     }
 865
 866   return new_lst_loop (seq);
 867 }
 868
 869 /* Reads the original scattering of the SCOP and returns an LST
 870    representing it.  */
 871
 872 void
 873 scop_to_lst (scop_p scop)
 874 {
 875   lst_p res;
 876   int i, n = VEC_length (poly_bb_p, SCOP_BBS (scop));
 877   VEC (lst_p, heap) *seq = VEC_alloc (lst_p, heap, 5);
 878   sese region = SCOP_REGION (scop);
 879
 880   for (i = 0; i < n; i++)
 881     {
 882       poly_bb_p pbb = VEC_index (poly_bb_p, SCOP_BBS (scop), i);
 883       loop_p loop = outermost_loop_in_sese (region, GBB_BB (PBB_BLACK_BOX (pbb)));
 884
 885       if (loop_in_sese_p (loop, region))
 886         res = loop_to_lst (loop, SCOP_BBS (scop), &i);
 887       else
 888         res = new_lst_stmt (pbb);
 889
 890       VEC_safe_push (lst_p, heap, seq, res);
 891     }
 892
 893   res = new_lst_loop (seq);
 894   SCOP_ORIGINAL_SCHEDULE (scop) = res;
 895   SCOP_TRANSFORMED_SCHEDULE (scop) = copy_lst (res);
 896 }
 897
 898 /* Print LST to FILE with INDENT spaces of indentation.  */
 899
 900 void
 901 print_lst (FILE *file, lst_p lst, int indent)
 902 {
 903   if (!lst)
 904     return;
 905
 906   indent_to (file, indent);
 907
 908   if (LST_LOOP_P (lst))
 909     {
 910       int i;
 911       lst_p l;
 912
 913       if (LST_LOOP_FATHER (lst))
 914         fprintf (file, "%d (loop", lst_dewey_number (lst));
 915       else
 916         fprintf (file, "(root");
 917
 918       for (i = 0; VEC_iterate (lst_p, LST_SEQ (lst), i, l); i++)
 919         print_lst (file, l, indent + 2);
 920
 921       fprintf (file, ")");
 922     }
 923   else
 924     fprintf (file, "%d stmt_%d", lst_dewey_number (lst), pbb_index (LST_PBB (lst)));
 925 }
 926
 927 /* Print LST to STDERR.  */
 928
 929 void
 930 debug_lst (lst_p lst)
 931 {
 932   print_lst (stderr, lst, 0);
 933 }
 934
 935 /* Pretty print to FILE the loop statement tree LST in DOT format.  */
 936
 937 static void
 938 dot_lst_1 (FILE *file, lst_p lst)
 939 {
 940   if (!lst)
 941     return;
 942
 943   if (LST_LOOP_P (lst))
 944     {
 945       int i;
 946       lst_p l;
 947
 948       if (!LST_LOOP_FATHER (lst))
 949         fprintf (file, "L -> L_%d_%d\n",
 950                  lst_depth (lst),
 951                  lst_dewey_number (lst));
 952       else
 953         fprintf (file, "L_%d_%d -> L_%d_%d\n",
 954                  lst_depth (LST_LOOP_FATHER (lst)),
 955                  lst_dewey_number (LST_LOOP_FATHER (lst)),
 956                  lst_depth (lst),
 957                  lst_dewey_number (lst));
 958
 959       for (i = 0; VEC_iterate (lst_p, LST_SEQ (lst), i, l); i++)
 960         dot_lst_1 (file, l);
 961     }
 962
 963   else
 964     fprintf (file, "L_%d_%d -> S_%d\n",
 965              lst_depth (LST_LOOP_FATHER (lst)),
 966              lst_dewey_number (LST_LOOP_FATHER (lst)),
 967              pbb_index (LST_PBB (lst)));
 968
 969 }
 970
 971 /* Display the LST using dotty.  */
 972
 973 void
 974 dot_lst (lst_p lst)
 975 {
 976   /* When debugging, enable the following code.  This cannot be used
 977      in production compilers because it calls "system".  */
 978 #if 0
 979   int x;
 980   FILE *stream = fopen ("/tmp/lst.dot", "w");
 981   gcc_assert (stream);
 982
 983   fputs ("digraph all {\n", stream);
 984   dot_lst_1 (stream, lst);
 985   fputs ("}\n\n", stream);
 986   fclose (stream);
 987
 988   x = system ("dotty /tmp/lst.dot");
 989 #else
 990   fputs ("digraph all {\n", stderr);
 991   dot_lst_1 (stderr, lst);
 992   fputs ("}\n\n", stderr);
 993
 994 #endif
 995 }
 996
 997 #endif
 998