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     transform_done |= scop_do_block (scop);
 254   else
 255     {
 256       if (flag_loop_strip_mine)
 257         transform_done |= scop_do_strip_mine (scop);
 258
 259       if (flag_loop_interchange)
 260         transform_done |= scop_do_interchange (scop);
 261     }
 262
 263   return transform_done;
 264 }
 265
 266 /* Returns true when it PDR1 is a duplicate of PDR2: same PBB, and
 267    their ACCESSES, TYPE, and NB_SUBSCRIPTS are the same.  */
 268
 269 static inline bool
 270 can_collapse_pdrs (poly_dr_p pdr1, poly_dr_p pdr2)
 271 {
 272   bool res;
 273   ppl_Pointset_Powerset_C_Polyhedron_t af1, af2, diff;
 274
 275   if (PDR_PBB (pdr1) != PDR_PBB (pdr2)
 276       || PDR_NB_SUBSCRIPTS (pdr1) != PDR_NB_SUBSCRIPTS (pdr2)
 277       || PDR_TYPE (pdr1) != PDR_TYPE (pdr2))
 278     return false;
 279
 280   af1 = PDR_ACCESSES (pdr1);
 281   af2 = PDR_ACCESSES (pdr2);
 282   ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
 283     (&diff, af1);
 284   ppl_Pointset_Powerset_C_Polyhedron_difference_assign (diff, af2);
 285
 286   res = ppl_Pointset_Powerset_C_Polyhedron_is_empty (diff);
 287   ppl_delete_Pointset_Powerset_C_Polyhedron (diff);
 288   return res;
 289 }
 290
 291 /* Removes duplicated data references in PBB.  */
 292
 293 void
 294 pbb_remove_duplicate_pdrs (poly_bb_p pbb)
 295 {
 296   int i, j;
 297   poly_dr_p pdr1, pdr2;
 298   unsigned n = VEC_length (poly_dr_p, PBB_DRS (pbb));
 299   VEC (poly_dr_p, heap) *collapsed = VEC_alloc (poly_dr_p, heap, n);
 300
 301   for (i = 0; VEC_iterate (poly_dr_p, PBB_DRS (pbb), i, pdr1); i++)
 302     for (j = 0; VEC_iterate (poly_dr_p, collapsed, j, pdr2); j++)
 303       if (!can_collapse_pdrs (pdr1, pdr2))
 304         VEC_quick_push (poly_dr_p, collapsed, pdr1);
 305
 306   VEC_free (poly_dr_p, heap, collapsed);
 307   PBB_PDR_DUPLICATES_REMOVED (pbb) = true;
 308 }
 309
 310 /* Create a new polyhedral data reference and add it to PBB.  It is
 311    defined by its ACCESSES, its TYPE, and the number of subscripts
 312    NB_SUBSCRIPTS.  */
 313
 314 void
 315 new_poly_dr (poly_bb_p pbb, int dr_base_object_set,
 316              ppl_Pointset_Powerset_C_Polyhedron_t accesses,
 317              enum poly_dr_type type, void *cdr, graphite_dim_t nb_subscripts)
 318 {
 319   static int id = 0;
 320   poly_dr_p pdr = XNEW (struct poly_dr);
 321
 322   PDR_ID (pdr) = id++;
 323   PDR_BASE_OBJECT_SET (pdr) = dr_base_object_set;
 324   PDR_NB_REFS (pdr) = 1;
 325   PDR_PBB (pdr) = pbb;
 326   PDR_ACCESSES (pdr) = accesses;
 327   PDR_TYPE (pdr) = type;
 328   PDR_CDR (pdr) = cdr;
 329   PDR_NB_SUBSCRIPTS (pdr) = nb_subscripts;
 330   VEC_safe_push (poly_dr_p, heap, PBB_DRS (pbb), pdr);
 331 }
 332
 333 /* Free polyhedral data reference PDR.  */
 334
 335 void
 336 free_poly_dr (poly_dr_p pdr)
 337 {
 338   ppl_delete_Pointset_Powerset_C_Polyhedron (PDR_ACCESSES (pdr));
 339   XDELETE (pdr);
 340 }
 341
 342 /* Create a new polyhedral black box.  */
 343
 344 void
 345 new_poly_bb (scop_p scop, void *black_box, bool reduction)
 346 {
 347   poly_bb_p pbb = XNEW (struct poly_bb);
 348
 349   PBB_DOMAIN (pbb) = NULL;
 350   PBB_SCOP (pbb) = scop;
 351   pbb_set_black_box (pbb, black_box);
 352   PBB_TRANSFORMED (pbb) = NULL;
 353   PBB_SAVED (pbb) = NULL;
 354   PBB_ORIGINAL (pbb) = NULL;
 355   PBB_DRS (pbb) = VEC_alloc (poly_dr_p, heap, 3);
 356   PBB_IS_REDUCTION (pbb) = reduction;
 357   PBB_PDR_DUPLICATES_REMOVED (pbb) = false;
 358   VEC_safe_push (poly_bb_p, heap, SCOP_BBS (scop), pbb);
 359 }
 360
 361 /* Free polyhedral black box.  */
 362
 363 void
 364 free_poly_bb (poly_bb_p pbb)
 365 {
 366   int i;
 367   poly_dr_p pdr;
 368
 369   ppl_delete_Pointset_Powerset_C_Polyhedron (PBB_DOMAIN (pbb));
 370
 371   if (PBB_TRANSFORMED (pbb))
 372     poly_scattering_free (PBB_TRANSFORMED (pbb));
 373
 374   if (PBB_SAVED (pbb))
 375     poly_scattering_free (PBB_SAVED (pbb));
 376
 377   if (PBB_ORIGINAL (pbb))
 378     poly_scattering_free (PBB_ORIGINAL (pbb));
 379
 380   if (PBB_DRS (pbb))
 381     for (i = 0; VEC_iterate (poly_dr_p, PBB_DRS (pbb), i, pdr); i++)
 382       free_poly_dr (pdr);
 383
 384   VEC_free (poly_dr_p, heap, PBB_DRS (pbb));
 385   XDELETE (pbb);
 386 }
 387
 388 static void
 389 print_pdr_access_layout (FILE *file, poly_dr_p pdr)
 390 {
 391   graphite_dim_t i;
 392
 393   fprintf (file, "#  eq");
 394
 395   for (i = 0; i < pdr_dim_iter_domain (pdr); i++)
 396     fprintf (file, "     i%d", (int) i);
 397
 398   for (i = 0; i < pdr_nb_params (pdr); i++)
 399     fprintf (file, "     p%d", (int) i);
 400
 401   fprintf (file, "  alias");
 402
 403   for (i = 0; i < PDR_NB_SUBSCRIPTS (pdr); i++)
 404     fprintf (file, "   sub%d", (int) i);
 405
 406   fprintf (file, "    cst\n");
 407 }
 408
 409 /* Prints to FILE the polyhedral data reference PDR.  */
 410
 411 void
 412 print_pdr (FILE *file, poly_dr_p pdr)
 413 {
 414   fprintf (file, "pdr_%d (", PDR_ID (pdr));
 415
 416   switch (PDR_TYPE (pdr))
 417     {
 418     case PDR_READ:
 419       fprintf (file, "read \n");
 420       break;
 421
 422     case PDR_WRITE:
 423       fprintf (file, "write \n");
 424       break;
 425
 426     case PDR_MAY_WRITE:
 427       fprintf (file, "may_write \n");
 428       break;
 429
 430     default:
 431       gcc_unreachable ();
 432     }
 433
 434   dump_data_reference (file, (data_reference_p) PDR_CDR (pdr));
 435
 436   fprintf (file, "data accesses (\n");
 437   print_pdr_access_layout (file, pdr);
 438   ppl_print_powerset_matrix (file, PDR_ACCESSES (pdr));
 439   fprintf (file, ")\n");
 440
 441   fprintf (file, ")\n");
 442 }
 443
 444 /* Prints to STDERR the polyhedral data reference PDR.  */
 445
 446 void
 447 debug_pdr (poly_dr_p pdr)
 448 {
 449   print_pdr (stderr, pdr);
 450 }
 451
 452 /* Creates a new SCOP containing REGION.  */
 453
 454 scop_p
 455 new_scop (void *region)
 456 {
 457   scop_p scop = XNEW (struct scop);
 458
 459   SCOP_CONTEXT (scop) = NULL;
 460   scop_set_region (scop, region);
 461   SCOP_BBS (scop) = VEC_alloc (poly_bb_p, heap, 3);
 462   SCOP_ORIGINAL_PDDRS (scop) = htab_create (10, hash_poly_ddr_p,
 463                                             eq_poly_ddr_p, free_poly_ddr);
 464   SCOP_ORIGINAL_SCHEDULE (scop) = NULL;
 465   SCOP_TRANSFORMED_SCHEDULE (scop) = NULL;
 466   SCOP_SAVED_SCHEDULE (scop) = NULL;
 467   POLY_SCOP_P (scop) = false;
 468
 469   return scop;
 470 }
 471
 472 /* Deletes SCOP.  */
 473
 474 void
 475 free_scop (scop_p scop)
 476 {
 477   int i;
 478   poly_bb_p pbb;
 479
 480   for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
 481     free_poly_bb (pbb);
 482
 483   VEC_free (poly_bb_p, heap, SCOP_BBS (scop));
 484
 485   if (SCOP_CONTEXT (scop))
 486     ppl_delete_Pointset_Powerset_C_Polyhedron (SCOP_CONTEXT (scop));
 487
 488   htab_delete (SCOP_ORIGINAL_PDDRS (scop));
 489   free_lst (SCOP_ORIGINAL_SCHEDULE (scop));
 490   free_lst (SCOP_TRANSFORMED_SCHEDULE (scop));
 491   free_lst (SCOP_SAVED_SCHEDULE (scop));
 492   XDELETE (scop);
 493 }
 494
 495 /* Print to FILE the domain of PBB.  */
 496
 497 void
 498 print_pbb_domain (FILE *file, poly_bb_p pbb)
 499 {
 500   graphite_dim_t i;
 501   gimple_bb_p gbb = PBB_BLACK_BOX (pbb);
 502
 503   if (!PBB_DOMAIN (pbb))
 504     return;
 505
 506   fprintf (file, "domains bb_%d (\n", GBB_BB (gbb)->index);
 507   fprintf (file, "#  eq");
 508
 509   for (i = 0; i < pbb_dim_iter_domain (pbb); i++)
 510     fprintf (file, "     i%d", (int) i);
 511
 512   for (i = 0; i < pbb_nb_params (pbb); i++)
 513     fprintf (file, "     p%d", (int) i);
 514
 515   fprintf (file, "    cst\n");
 516
 517   if (PBB_DOMAIN (pbb))
 518     ppl_print_powerset_matrix (file, PBB_DOMAIN (pbb));
 519
 520   fprintf (file, ")\n");
 521 }
 522
 523 /* Dump the cases of a graphite basic block GBB on FILE.  */
 524
 525 static void
 526 dump_gbb_cases (FILE *file, gimple_bb_p gbb)
 527 {
 528   int i;
 529   gimple stmt;
 530   VEC (gimple, heap) *cases;
 531
 532   if (!gbb)
 533     return;
 534
 535   cases = GBB_CONDITION_CASES (gbb);
 536   if (VEC_empty (gimple, cases))
 537     return;
 538
 539   fprintf (file, "cases bb_%d (", GBB_BB (gbb)->index);
 540
 541   for (i = 0; VEC_iterate (gimple, cases, i, stmt); i++)
 542     print_gimple_stmt (file, stmt, 0, 0);
 543
 544   fprintf (file, ")\n");
 545 }
 546
 547 /* Dump conditions of a graphite basic block GBB on FILE.  */
 548
 549 static void
 550 dump_gbb_conditions (FILE *file, gimple_bb_p gbb)
 551 {
 552   int i;
 553   gimple stmt;
 554   VEC (gimple, heap) *conditions;
 555
 556   if (!gbb)
 557     return;
 558
 559   conditions = GBB_CONDITIONS (gbb);
 560   if (VEC_empty (gimple, conditions))
 561     return;
 562
 563   fprintf (file, "conditions bb_%d (", GBB_BB (gbb)->index);
 564
 565   for (i = 0; VEC_iterate (gimple, conditions, i, stmt); i++)
 566     print_gimple_stmt (file, stmt, 0, 0);
 567
 568   fprintf (file, ")\n");
 569 }
 570
 571 /* Print to FILE all the data references of PBB.  */
 572
 573 void
 574 print_pdrs (FILE *file, poly_bb_p pbb)
 575 {
 576   int i;
 577   poly_dr_p pdr;
 578
 579   for (i = 0; VEC_iterate (poly_dr_p, PBB_DRS (pbb), i, pdr); i++)
 580     print_pdr (file, pdr);
 581 }
 582
 583 /* Print to STDERR all the data references of PBB.  */
 584
 585 void
 586 debug_pdrs (poly_bb_p pbb)
 587 {
 588   print_pdrs (stderr, pbb);
 589 }
 590
 591 /* Print to FILE the domain and scattering function of PBB.  */
 592
 593 void
 594 print_pbb (FILE *file, poly_bb_p pbb)
 595 {
 596   fprintf (file, "pbb_%d (\n", pbb_index (pbb));
 597   dump_gbb_conditions (file, PBB_BLACK_BOX (pbb));
 598   dump_gbb_cases (file, PBB_BLACK_BOX (pbb));
 599   print_pdrs (file, pbb);
 600   print_pbb_domain (file, pbb);
 601   print_scattering_function (file, pbb);
 602   fprintf (file, ")\n");
 603 }
 604
 605 /* Print to FILE the parameters of SCOP.  */
 606
 607 void
 608 print_scop_params (FILE *file, scop_p scop)
 609 {
 610   int i;
 611   tree t;
 612
 613   fprintf (file, "parameters (\n");
 614   for (i = 0; VEC_iterate (tree, SESE_PARAMS (SCOP_REGION (scop)), i, t); i++)
 615     {
 616       fprintf (file, "p_%d -> ", i);
 617       print_generic_expr (file, t, 0);
 618       fprintf (file, "\n");
 619     }
 620   fprintf (file, ")\n");
 621 }
 622
 623 /* Print to FILE the context of SCoP.  */
 624 void
 625 print_scop_context (FILE *file, scop_p scop)
 626 {
 627   graphite_dim_t i;
 628
 629   fprintf (file, "context (\n");
 630   fprintf (file, "#  eq");
 631
 632   for (i = 0; i < scop_nb_params (scop); i++)
 633     fprintf (file, "     p%d", (int) i);
 634
 635   fprintf (file, "    cst\n");
 636
 637   if (SCOP_CONTEXT (scop))
 638     ppl_print_powerset_matrix (file, SCOP_CONTEXT (scop));
 639
 640   fprintf (file, ")\n");
 641 }
 642
 643 /* Print to FILE the SCOP.  */
 644
 645 void
 646 print_scop (FILE *file, scop_p scop)
 647 {
 648   int i;
 649   poly_bb_p pbb;
 650
 651   fprintf (file, "scop (\n");
 652   print_scop_params (file, scop);
 653   print_scop_context (file, scop);
 654
 655   for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
 656     print_pbb (file, pbb);
 657
 658   fprintf (file, "original_lst (\n");
 659   print_lst (file, SCOP_ORIGINAL_SCHEDULE (scop), 0);
 660   fprintf (file, ")\n");
 661
 662   fprintf (file, "transformed_lst (\n");
 663   print_lst (file, SCOP_TRANSFORMED_SCHEDULE (scop), 0);
 664   fprintf (file, ")\n");
 665
 666   fprintf (file, ")\n");
 667 }
 668
 669 /* Print to STDERR the domain of PBB.  */
 670
 671 void
 672 debug_pbb_domain (poly_bb_p pbb)
 673 {
 674   print_pbb_domain (stderr, pbb);
 675 }
 676
 677 /* Print to FILE the domain and scattering function of PBB.  */
 678
 679 void
 680 debug_pbb (poly_bb_p pbb)
 681 {
 682   print_pbb (stderr, pbb);
 683 }
 684
 685 /* Print to STDERR the context of SCOP.  */
 686
 687 void
 688 debug_scop_context (scop_p scop)
 689 {
 690   print_scop_context (stderr, scop);
 691 }
 692
 693 /* Print to STDERR the SCOP.  */
 694
 695 void
 696 debug_scop (scop_p scop)
 697 {
 698   print_scop (stderr, scop);
 699 }
 700
 701 /* Print to STDERR the parameters of SCOP.  */
 702
 703 void
 704 debug_scop_params (scop_p scop)
 705 {
 706   print_scop_params (stderr, scop);
 707 }
 708
 709
 710 /* The dimension in the transformed scattering polyhedron of PBB
 711    containing the scattering iterator for the loop at depth LOOP_DEPTH.  */
 712
 713 ppl_dimension_type
 714 psct_scattering_dim_for_loop_depth (poly_bb_p pbb, graphite_dim_t loop_depth)
 715 {
 716   ppl_const_Constraint_System_t pcs;
 717   ppl_Constraint_System_const_iterator_t cit, cend;
 718   ppl_const_Constraint_t cstr;
 719   ppl_Polyhedron_t ph = PBB_TRANSFORMED_SCATTERING (pbb);
 720   ppl_dimension_type iter = psct_iterator_dim (pbb, loop_depth);
 721   ppl_Linear_Expression_t expr;
 722   ppl_Coefficient_t coef;
 723   Value val;
 724   graphite_dim_t i;
 725
 726   value_init (val);
 727   ppl_new_Coefficient (&coef);
 728   ppl_Polyhedron_get_constraints (ph, &pcs);
 729   ppl_new_Constraint_System_const_iterator (&cit);
 730   ppl_new_Constraint_System_const_iterator (&cend);
 731
 732   for (ppl_Constraint_System_begin (pcs, cit),
 733          ppl_Constraint_System_end (pcs, cend);
 734        !ppl_Constraint_System_const_iterator_equal_test (cit, cend);
 735        ppl_Constraint_System_const_iterator_increment (cit))
 736     {
 737       ppl_Constraint_System_const_iterator_dereference (cit, &cstr);
 738       ppl_new_Linear_Expression_from_Constraint (&expr, cstr);
 739       ppl_Linear_Expression_coefficient (expr, iter, coef);
 740       ppl_Coefficient_to_mpz_t (coef, val);
 741
 742       if (value_zero_p (val))
 743         {
 744           ppl_delete_Linear_Expression (expr);
 745           continue;
 746         }
 747
 748       for (i = 0; i < pbb_nb_scattering_transform (pbb); i++)
 749         {
 750           ppl_dimension_type scatter = psct_scattering_dim (pbb, i);
 751
 752           ppl_Linear_Expression_coefficient (expr, scatter, coef);
 753           ppl_Coefficient_to_mpz_t (coef, val);
 754
 755           if (value_notzero_p (val))
 756             {
 757               value_clear (val);
 758               ppl_delete_Linear_Expression (expr);
 759               ppl_delete_Coefficient (coef);
 760               ppl_delete_Constraint_System_const_iterator (cit);
 761               ppl_delete_Constraint_System_const_iterator (cend);
 762
 763               return scatter;
 764             }
 765         }
 766     }
 767
 768   gcc_unreachable ();
 769 }
 770
 771 /* Returns the number of iterations NITER of the loop around PBB at
 772    depth LOOP_DEPTH.  */
 773
 774 void
 775 pbb_number_of_iterations (poly_bb_p pbb,
 776                           graphite_dim_t loop_depth,
 777                           Value niter)
 778 {
 779   ppl_Linear_Expression_t le;
 780   ppl_dimension_type dim;
 781
 782   ppl_Pointset_Powerset_C_Polyhedron_space_dimension (PBB_DOMAIN (pbb), &dim);
 783   ppl_new_Linear_Expression_with_dimension (&le, dim);
 784   ppl_set_coef (le, pbb_iterator_dim (pbb, loop_depth), 1);
 785   value_set_si (niter, -1);
 786   ppl_max_for_le_pointset (PBB_DOMAIN (pbb), le, niter);
 787   ppl_delete_Linear_Expression (le);
 788 }
 789
 790 /* Returns the number of iterations NITER of the loop around PBB at
 791    time(scattering) dimension TIME_DEPTH.  */
 792
 793 void
 794 pbb_number_of_iterations_at_time (poly_bb_p pbb,
 795                                   graphite_dim_t time_depth,
 796                                   Value niter)
 797 {
 798   ppl_Pointset_Powerset_C_Polyhedron_t ext_domain, sctr;
 799   ppl_Linear_Expression_t le;
 800   ppl_dimension_type dim;
 801
 802   /* Takes together domain and scattering polyhedrons, and composes
 803      them into the bigger polyhedron that has the following format:
 804
 805      t0..t_{n-1} | l0..l_{nlcl-1} | i0..i_{niter-1} | g0..g_{nparm-1}
 806
 807      where
 808      | t0..t_{n-1} are time dimensions (scattering dimensions)
 809      | l0..l_{nclc-1} are local variables in scattering function
 810      | i0..i_{niter-1} are original iteration variables
 811      | g0..g_{nparam-1} are global parameters.  */
 812
 813   ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron (&sctr,
 814       PBB_TRANSFORMED_SCATTERING (pbb));
 815
 816   /* Extend the iteration domain with the scattering dimensions:
 817      0..0 | 0..0 | i0..i_{niter-1} | g0..g_{nparm-1}.   */
 818   ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
 819     (&ext_domain, PBB_DOMAIN (pbb));
 820   ppl_insert_dimensions_pointset (ext_domain, 0,
 821                                   pbb_nb_scattering_transform (pbb)
 822                                   + pbb_nb_local_vars (pbb));
 823
 824   /* Add to sctr the extended domain.  */
 825   ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (sctr, ext_domain);
 826
 827   /* Extract the number of iterations.  */
 828   ppl_Pointset_Powerset_C_Polyhedron_space_dimension (sctr, &dim);
 829   ppl_new_Linear_Expression_with_dimension (&le, dim);
 830   ppl_set_coef (le, time_depth, 1);
 831   value_set_si (niter, -1);
 832   ppl_max_for_le_pointset (sctr, le, niter);
 833
 834   ppl_delete_Linear_Expression (le);
 835   ppl_delete_Pointset_Powerset_C_Polyhedron (sctr);
 836   ppl_delete_Pointset_Powerset_C_Polyhedron (ext_domain);
 837 }
 838
 839 /* Translates LOOP to LST.  */
 840
 841 static lst_p
 842 loop_to_lst (loop_p loop, VEC (poly_bb_p, heap) *bbs, int *i)
 843 {
 844   poly_bb_p pbb;
 845   VEC (lst_p, heap) *seq = VEC_alloc (lst_p, heap, 5);
 846
 847   for (; VEC_iterate (poly_bb_p, bbs, *i, pbb); (*i)++)
 848     {
 849       lst_p stmt;
 850       basic_block bb = GBB_BB (PBB_BLACK_BOX (pbb));
 851
 852       if (bb->loop_father == loop)
 853         stmt = new_lst_stmt (pbb);
 854       else if (flow_bb_inside_loop_p (loop, bb))
 855         {
 856           loop_p next = loop->inner;
 857
 858           while (next && !flow_bb_inside_loop_p (next, bb))
 859             next = next->next;
 860
 861           stmt = loop_to_lst (next, bbs, i);
 862         }
 863       else
 864         {
 865           (*i)--;
 866           return new_lst_loop (seq);
 867         }
 868
 869       VEC_safe_push (lst_p, heap, seq, stmt);
 870     }
 871
 872   return new_lst_loop (seq);
 873 }
 874
 875 /* Reads the original scattering of the SCOP and returns an LST
 876    representing it.  */
 877
 878 void
 879 scop_to_lst (scop_p scop)
 880 {
 881   lst_p res;
 882   int i, n = VEC_length (poly_bb_p, SCOP_BBS (scop));
 883   VEC (lst_p, heap) *seq = VEC_alloc (lst_p, heap, 5);
 884   sese region = SCOP_REGION (scop);
 885
 886   for (i = 0; i < n; i++)
 887     {
 888       poly_bb_p pbb = VEC_index (poly_bb_p, SCOP_BBS (scop), i);
 889       loop_p loop = outermost_loop_in_sese (region, GBB_BB (PBB_BLACK_BOX (pbb)));
 890
 891       if (loop_in_sese_p (loop, region))
 892         res = loop_to_lst (loop, SCOP_BBS (scop), &i);
 893       else
 894         res = new_lst_stmt (pbb);
 895
 896       VEC_safe_push (lst_p, heap, seq, res);
 897     }
 898
 899   res = new_lst_loop (seq);
 900   SCOP_ORIGINAL_SCHEDULE (scop) = res;
 901   SCOP_TRANSFORMED_SCHEDULE (scop) = copy_lst (res);
 902 }
 903
 904 /* Print LST to FILE with INDENT spaces of indentation.  */
 905
 906 void
 907 print_lst (FILE *file, lst_p lst, int indent)
 908 {
 909   if (!lst)
 910     return;
 911
 912   indent_to (file, indent);
 913
 914   if (LST_LOOP_P (lst))
 915     {
 916       int i;
 917       lst_p l;
 918
 919       if (LST_LOOP_FATHER (lst))
 920         fprintf (file, "%d (loop", lst_dewey_number (lst));
 921       else
 922         fprintf (file, "(root");
 923
 924       for (i = 0; VEC_iterate (lst_p, LST_SEQ (lst), i, l); i++)
 925         print_lst (file, l, indent + 2);
 926
 927       fprintf (file, ")");
 928     }
 929   else
 930     fprintf (file, "%d stmt_%d", lst_dewey_number (lst), pbb_index (LST_PBB (lst)));
 931 }
 932
 933 /* Print LST to STDERR.  */
 934
 935 void
 936 debug_lst (lst_p lst)
 937 {
 938   print_lst (stderr, lst, 0);
 939 }
 940
 941 /* Pretty print to FILE the loop statement tree LST in DOT format.  */
 942
 943 static void
 944 dot_lst_1 (FILE *file, lst_p lst)
 945 {
 946   if (!lst)
 947     return;
 948
 949   if (LST_LOOP_P (lst))
 950     {
 951       int i;
 952       lst_p l;
 953
 954       if (!LST_LOOP_FATHER (lst))
 955         fprintf (file, "L -> L_%d_%d\n",
 956                  lst_depth (lst),
 957                  lst_dewey_number (lst));
 958       else
 959         fprintf (file, "L_%d_%d -> L_%d_%d\n",
 960                  lst_depth (LST_LOOP_FATHER (lst)),
 961                  lst_dewey_number (LST_LOOP_FATHER (lst)),
 962                  lst_depth (lst),
 963                  lst_dewey_number (lst));
 964
 965       for (i = 0; VEC_iterate (lst_p, LST_SEQ (lst), i, l); i++)
 966         dot_lst_1 (file, l);
 967     }
 968
 969   else
 970     fprintf (file, "L_%d_%d -> S_%d\n",
 971              lst_depth (LST_LOOP_FATHER (lst)),
 972              lst_dewey_number (LST_LOOP_FATHER (lst)),
 973              pbb_index (LST_PBB (lst)));
 974
 975 }
 976
 977 /* Display the LST using dotty.  */
 978
 979 void
 980 dot_lst (lst_p lst)
 981 {
 982   /* When debugging, enable the following code.  This cannot be used
 983      in production compilers because it calls "system".  */
 984 #if 0
 985   int x;
 986   FILE *stream = fopen ("/tmp/lst.dot", "w");
 987   gcc_assert (stream);
 988
 989   fputs ("digraph all {\n", stream);
 990   dot_lst_1 (stream, lst);
 991   fputs ("}\n\n", stream);
 992   fclose (stream);
 993
 994   x = system ("dotty /tmp/lst.dot");
 995 #else
 996   fputs ("digraph all {\n", stderr);
 997   dot_lst_1 (stderr, lst);
 998   fputs ("}\n\n", stderr);
 999
1000 #endif
1001 }
1002
1003 #endif
1004