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   VEC_free (poly_dr_p, heap, collapsed);
 310   PBB_PDR_DUPLICATES_REMOVED (pbb) = true;
 311 }
 312
 313 /* Create a new polyhedral data reference and add it to PBB.  It is
 314    defined by its ACCESSES, its TYPE, and the number of subscripts
 315    NB_SUBSCRIPTS.  */
 316
 317 void
 318 new_poly_dr (poly_bb_p pbb, int dr_base_object_set,
 319              ppl_Pointset_Powerset_C_Polyhedron_t accesses,
 320              enum poly_dr_type type, void *cdr, graphite_dim_t nb_subscripts)
 321 {
 322   static int id = 0;
 323   poly_dr_p pdr = XNEW (struct poly_dr);
 324
 325   PDR_ID (pdr) = id++;
 326   PDR_BASE_OBJECT_SET (pdr) = dr_base_object_set;
 327   PDR_NB_REFS (pdr) = 1;
 328   PDR_PBB (pdr) = pbb;
 329   PDR_ACCESSES (pdr) = accesses;
 330   PDR_TYPE (pdr) = type;
 331   PDR_CDR (pdr) = cdr;
 332   PDR_NB_SUBSCRIPTS (pdr) = nb_subscripts;
 333   VEC_safe_push (poly_dr_p, heap, PBB_DRS (pbb), pdr);
 334 }
 335
 336 /* Free polyhedral data reference PDR.  */
 337
 338 void
 339 free_poly_dr (poly_dr_p pdr)
 340 {
 341   ppl_delete_Pointset_Powerset_C_Polyhedron (PDR_ACCESSES (pdr));
 342   XDELETE (pdr);
 343 }
 344
 345 /* Create a new polyhedral black box.  */
 346
 347 void
 348 new_poly_bb (scop_p scop, void *black_box, bool reduction)
 349 {
 350   poly_bb_p pbb = XNEW (struct poly_bb);
 351
 352   PBB_DOMAIN (pbb) = NULL;
 353   PBB_SCOP (pbb) = scop;
 354   pbb_set_black_box (pbb, black_box);
 355   PBB_TRANSFORMED (pbb) = NULL;
 356   PBB_SAVED (pbb) = NULL;
 357   PBB_ORIGINAL (pbb) = NULL;
 358   PBB_DRS (pbb) = VEC_alloc (poly_dr_p, heap, 3);
 359   PBB_IS_REDUCTION (pbb) = reduction;
 360   PBB_PDR_DUPLICATES_REMOVED (pbb) = false;
 361   VEC_safe_push (poly_bb_p, heap, SCOP_BBS (scop), pbb);
 362 }
 363
 364 /* Free polyhedral black box.  */
 365
 366 void
 367 free_poly_bb (poly_bb_p pbb)
 368 {
 369   int i;
 370   poly_dr_p pdr;
 371
 372   ppl_delete_Pointset_Powerset_C_Polyhedron (PBB_DOMAIN (pbb));
 373
 374   if (PBB_TRANSFORMED (pbb))
 375     poly_scattering_free (PBB_TRANSFORMED (pbb));
 376
 377   if (PBB_SAVED (pbb))
 378     poly_scattering_free (PBB_SAVED (pbb));
 379
 380   if (PBB_ORIGINAL (pbb))
 381     poly_scattering_free (PBB_ORIGINAL (pbb));
 382
 383   if (PBB_DRS (pbb))
 384     for (i = 0; VEC_iterate (poly_dr_p, PBB_DRS (pbb), i, pdr); i++)
 385       free_poly_dr (pdr);
 386
 387   VEC_free (poly_dr_p, heap, PBB_DRS (pbb));
 388   XDELETE (pbb);
 389 }
 390
 391 static void
 392 print_pdr_access_layout (FILE *file, poly_dr_p pdr)
 393 {
 394   graphite_dim_t i;
 395
 396   fprintf (file, "#  eq");
 397
 398   for (i = 0; i < pdr_dim_iter_domain (pdr); i++)
 399     fprintf (file, "     i%d", (int) i);
 400
 401   for (i = 0; i < pdr_nb_params (pdr); i++)
 402     fprintf (file, "     p%d", (int) i);
 403
 404   fprintf (file, "  alias");
 405
 406   for (i = 0; i < PDR_NB_SUBSCRIPTS (pdr); i++)
 407     fprintf (file, "   sub%d", (int) i);
 408
 409   fprintf (file, "    cst\n");
 410 }
 411
 412 /* Prints to FILE the polyhedral data reference PDR.  */
 413
 414 void
 415 print_pdr (FILE *file, poly_dr_p pdr)
 416 {
 417   fprintf (file, "pdr_%d (", PDR_ID (pdr));
 418
 419   switch (PDR_TYPE (pdr))
 420     {
 421     case PDR_READ:
 422       fprintf (file, "read \n");
 423       break;
 424
 425     case PDR_WRITE:
 426       fprintf (file, "write \n");
 427       break;
 428
 429     case PDR_MAY_WRITE:
 430       fprintf (file, "may_write \n");
 431       break;
 432
 433     default:
 434       gcc_unreachable ();
 435     }
 436
 437   dump_data_reference (file, (data_reference_p) PDR_CDR (pdr));
 438
 439   fprintf (file, "data accesses (\n");
 440   print_pdr_access_layout (file, pdr);
 441   ppl_print_powerset_matrix (file, PDR_ACCESSES (pdr));
 442   fprintf (file, ")\n");
 443
 444   fprintf (file, ")\n");
 445 }
 446
 447 /* Prints to STDERR the polyhedral data reference PDR.  */
 448
 449 void
 450 debug_pdr (poly_dr_p pdr)
 451 {
 452   print_pdr (stderr, pdr);
 453 }
 454
 455 /* Creates a new SCOP containing REGION.  */
 456
 457 scop_p
 458 new_scop (void *region)
 459 {
 460   scop_p scop = XNEW (struct scop);
 461
 462   SCOP_CONTEXT (scop) = NULL;
 463   scop_set_region (scop, region);
 464   SCOP_BBS (scop) = VEC_alloc (poly_bb_p, heap, 3);
 465   SCOP_ORIGINAL_PDDRS (scop) = htab_create (10, hash_poly_ddr_p,
 466                                             eq_poly_ddr_p, free_poly_ddr);
 467   SCOP_ORIGINAL_SCHEDULE (scop) = NULL;
 468   SCOP_TRANSFORMED_SCHEDULE (scop) = NULL;
 469   SCOP_SAVED_SCHEDULE (scop) = NULL;
 470   return scop;
 471 }
 472
 473 /* Deletes SCOP.  */
 474
 475 void
 476 free_scop (scop_p scop)
 477 {
 478   int i;
 479   poly_bb_p pbb;
 480
 481   for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
 482     free_poly_bb (pbb);
 483
 484   VEC_free (poly_bb_p, heap, SCOP_BBS (scop));
 485
 486   if (SCOP_CONTEXT (scop))
 487     ppl_delete_Pointset_Powerset_C_Polyhedron (SCOP_CONTEXT (scop));
 488
 489   htab_delete (SCOP_ORIGINAL_PDDRS (scop));
 490   free_lst (SCOP_ORIGINAL_SCHEDULE (scop));
 491   free_lst (SCOP_TRANSFORMED_SCHEDULE (scop));
 492   free_lst (SCOP_SAVED_SCHEDULE (scop));
 493   XDELETE (scop);
 494 }
 495
 496 /* Print to FILE the domain of PBB.  */
 497
 498 void
 499 print_pbb_domain (FILE *file, poly_bb_p pbb)
 500 {
 501   graphite_dim_t i;
 502   gimple_bb_p gbb = PBB_BLACK_BOX (pbb);
 503
 504   if (!PBB_DOMAIN (pbb))
 505     return;
 506
 507   fprintf (file, "domains bb_%d (\n", GBB_BB (gbb)->index);
 508   fprintf (file, "#  eq");
 509
 510   for (i = 0; i < pbb_dim_iter_domain (pbb); i++)
 511     fprintf (file, "     i%d", (int) i);
 512
 513   for (i = 0; i < pbb_nb_params (pbb); i++)
 514     fprintf (file, "     p%d", (int) i);
 515
 516   fprintf (file, "    cst\n");
 517
 518   if (PBB_DOMAIN (pbb))
 519     ppl_print_powerset_matrix (file, PBB_DOMAIN (pbb));
 520
 521   fprintf (file, ")\n");
 522 }
 523
 524 /* Dump the cases of a graphite basic block GBB on FILE.  */
 525
 526 static void
 527 dump_gbb_cases (FILE *file, gimple_bb_p gbb)
 528 {
 529   int i;
 530   gimple stmt;
 531   VEC (gimple, heap) *cases;
 532
 533   if (!gbb)
 534     return;
 535
 536   cases = GBB_CONDITION_CASES (gbb);
 537   if (VEC_empty (gimple, cases))
 538     return;
 539
 540   fprintf (file, "cases bb_%d (", GBB_BB (gbb)->index);
 541
 542   for (i = 0; VEC_iterate (gimple, cases, i, stmt); i++)
 543     print_gimple_stmt (file, stmt, 0, 0);
 544
 545   fprintf (file, ")\n");
 546 }
 547
 548 /* Dump conditions of a graphite basic block GBB on FILE.  */
 549
 550 static void
 551 dump_gbb_conditions (FILE *file, gimple_bb_p gbb)
 552 {
 553   int i;
 554   gimple stmt;
 555   VEC (gimple, heap) *conditions;
 556
 557   if (!gbb)
 558     return;
 559
 560   conditions = GBB_CONDITIONS (gbb);
 561   if (VEC_empty (gimple, conditions))
 562     return;
 563
 564   fprintf (file, "conditions bb_%d (", GBB_BB (gbb)->index);
 565
 566   for (i = 0; VEC_iterate (gimple, conditions, i, stmt); i++)
 567     print_gimple_stmt (file, stmt, 0, 0);
 568
 569   fprintf (file, ")\n");
 570 }
 571
 572 /* Print to FILE all the data references of PBB.  */
 573
 574 void
 575 print_pdrs (FILE *file, poly_bb_p pbb)
 576 {
 577   int i;
 578   poly_dr_p pdr;
 579
 580   for (i = 0; VEC_iterate (poly_dr_p, PBB_DRS (pbb), i, pdr); i++)
 581     print_pdr (file, pdr);
 582 }
 583
 584 /* Print to STDERR all the data references of PBB.  */
 585
 586 void
 587 debug_pdrs (poly_bb_p pbb)
 588 {
 589   print_pdrs (stderr, pbb);
 590 }
 591
 592 /* Print to FILE the domain and scattering function of PBB.  */
 593
 594 void
 595 print_pbb (FILE *file, poly_bb_p pbb)
 596 {
 597   fprintf (file, "pbb_%d (\n", pbb_index (pbb));
 598   dump_gbb_conditions (file, PBB_BLACK_BOX (pbb));
 599   dump_gbb_cases (file, PBB_BLACK_BOX (pbb));
 600   print_pdrs (file, pbb);
 601   print_pbb_domain (file, pbb);
 602   print_scattering_function (file, pbb);
 603   fprintf (file, ")\n");
 604 }
 605
 606 /* Print to FILE the parameters of SCOP.  */
 607
 608 void
 609 print_scop_params (FILE *file, scop_p scop)
 610 {
 611   int i;
 612   tree t;
 613
 614   fprintf (file, "parameters (\n");
 615   for (i = 0; VEC_iterate (tree, SESE_PARAMS (SCOP_REGION (scop)), i, t); i++)
 616     {
 617       fprintf (file, "p_%d -> ", i);
 618       print_generic_expr (file, t, 0);
 619       fprintf (file, "\n");
 620     }
 621   fprintf (file, ")\n");
 622 }
 623
 624 /* Print to FILE the context of SCoP.  */
 625 void
 626 print_scop_context (FILE *file, scop_p scop)
 627 {
 628   graphite_dim_t i;
 629
 630   fprintf (file, "context (\n");
 631   fprintf (file, "#  eq");
 632
 633   for (i = 0; i < scop_nb_params (scop); i++)
 634     fprintf (file, "     p%d", (int) i);
 635
 636   fprintf (file, "    cst\n");
 637
 638   if (SCOP_CONTEXT (scop))
 639     ppl_print_powerset_matrix (file, SCOP_CONTEXT (scop));
 640
 641   fprintf (file, ")\n");
 642 }
 643
 644 /* Print to FILE the SCOP.  */
 645
 646 void
 647 print_scop (FILE *file, scop_p scop)
 648 {
 649   int i;
 650   poly_bb_p pbb;
 651
 652   fprintf (file, "scop (\n");
 653   print_scop_params (file, scop);
 654   print_scop_context (file, scop);
 655
 656   for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
 657     print_pbb (file, pbb);
 658
 659   fprintf (file, "original_lst (\n");
 660   print_lst (file, SCOP_ORIGINAL_SCHEDULE (scop), 0);
 661   fprintf (file, ")\n");
 662
 663   fprintf (file, "transformed_lst (\n");
 664   print_lst (file, SCOP_TRANSFORMED_SCHEDULE (scop), 0);
 665   fprintf (file, ")\n");
 666
 667   fprintf (file, ")\n");
 668 }
 669
 670 /* Print to STDERR the domain of PBB.  */
 671
 672 void
 673 debug_pbb_domain (poly_bb_p pbb)
 674 {
 675   print_pbb_domain (stderr, pbb);
 676 }
 677
 678 /* Print to FILE the domain and scattering function of PBB.  */
 679
 680 void
 681 debug_pbb (poly_bb_p pbb)
 682 {
 683   print_pbb (stderr, pbb);
 684 }
 685
 686 /* Print to STDERR the context of SCOP.  */
 687
 688 void
 689 debug_scop_context (scop_p scop)
 690 {
 691   print_scop_context (stderr, scop);
 692 }
 693
 694 /* Print to STDERR the SCOP.  */
 695
 696 void
 697 debug_scop (scop_p scop)
 698 {
 699   print_scop (stderr, scop);
 700 }
 701
 702 /* Print to STDERR the parameters of SCOP.  */
 703
 704 void
 705 debug_scop_params (scop_p scop)
 706 {
 707   print_scop_params (stderr, scop);
 708 }
 709
 710
 711 /* The dimension in the transformed scattering polyhedron of PBB
 712    containing the scattering iterator for the loop at depth LOOP_DEPTH.  */
 713
 714 ppl_dimension_type
 715 psct_scattering_dim_for_loop_depth (poly_bb_p pbb, graphite_dim_t loop_depth)
 716 {
 717   ppl_const_Constraint_System_t pcs;
 718   ppl_Constraint_System_const_iterator_t cit, cend;
 719   ppl_const_Constraint_t cstr;
 720   ppl_Polyhedron_t ph = PBB_TRANSFORMED_SCATTERING (pbb);
 721   ppl_dimension_type iter = psct_iterator_dim (pbb, loop_depth);
 722   ppl_Linear_Expression_t expr;
 723   ppl_Coefficient_t coef;
 724   Value val;
 725   graphite_dim_t i;
 726
 727   value_init (val);
 728   ppl_new_Coefficient (&coef);
 729   ppl_Polyhedron_get_constraints (ph, &pcs);
 730   ppl_new_Constraint_System_const_iterator (&cit);
 731   ppl_new_Constraint_System_const_iterator (&cend);
 732
 733   for (ppl_Constraint_System_begin (pcs, cit),
 734          ppl_Constraint_System_end (pcs, cend);
 735        !ppl_Constraint_System_const_iterator_equal_test (cit, cend);
 736        ppl_Constraint_System_const_iterator_increment (cit))
 737     {
 738       ppl_Constraint_System_const_iterator_dereference (cit, &cstr);
 739       ppl_new_Linear_Expression_from_Constraint (&expr, cstr);
 740       ppl_Linear_Expression_coefficient (expr, iter, coef);
 741       ppl_Coefficient_to_mpz_t (coef, val);
 742
 743       if (value_zero_p (val))
 744         {
 745           ppl_delete_Linear_Expression (expr);
 746           continue;
 747         }
 748
 749       for (i = 0; i < pbb_nb_scattering_transform (pbb); i++)
 750         {
 751           ppl_dimension_type scatter = psct_scattering_dim (pbb, i);
 752
 753           ppl_Linear_Expression_coefficient (expr, scatter, coef);
 754           ppl_Coefficient_to_mpz_t (coef, val);
 755
 756           if (value_notzero_p (val))
 757             {
 758               value_clear (val);
 759               ppl_delete_Linear_Expression (expr);
 760               ppl_delete_Coefficient (coef);
 761               ppl_delete_Constraint_System_const_iterator (cit);
 762               ppl_delete_Constraint_System_const_iterator (cend);
 763
 764               return scatter;
 765             }
 766         }
 767     }
 768
 769   gcc_unreachable ();
 770 }
 771
 772 /* Returns the number of iterations NITER of the loop around PBB at
 773    depth LOOP_DEPTH.  */
 774
 775 void
 776 pbb_number_of_iterations (poly_bb_p pbb,
 777                           graphite_dim_t loop_depth,
 778                           Value niter)
 779 {
 780   ppl_Linear_Expression_t le;
 781   ppl_dimension_type dim;
 782
 783   ppl_Pointset_Powerset_C_Polyhedron_space_dimension (PBB_DOMAIN (pbb), &dim);
 784   ppl_new_Linear_Expression_with_dimension (&le, dim);
 785   ppl_set_coef (le, pbb_iterator_dim (pbb, loop_depth), 1);
 786   value_set_si (niter, -1);
 787   ppl_max_for_le_pointset (PBB_DOMAIN (pbb), le, niter);
 788   ppl_delete_Linear_Expression (le);
 789 }
 790
 791 /* Returns the number of iterations NITER of the loop around PBB at
 792    time(scattering) dimension TIME_DEPTH.  */
 793
 794 void
 795 pbb_number_of_iterations_at_time (poly_bb_p pbb,
 796                                   graphite_dim_t time_depth,
 797                                   Value niter)
 798 {
 799   ppl_Pointset_Powerset_C_Polyhedron_t ext_domain, sctr;
 800   ppl_Linear_Expression_t le;
 801   ppl_dimension_type dim;
 802
 803   /* Takes together domain and scattering polyhedrons, and composes
 804      them into the bigger polyhedron that has the following format:
 805
 806      t0..t_{n-1} | l0..l_{nlcl-1} | i0..i_{niter-1} | g0..g_{nparm-1}
 807
 808      where
 809      | t0..t_{n-1} are time dimensions (scattering dimensions)
 810      | l0..l_{nclc-1} are local variables in scattering function
 811      | i0..i_{niter-1} are original iteration variables
 812      | g0..g_{nparam-1} are global parameters.  */
 813
 814   ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron (&sctr,
 815       PBB_TRANSFORMED_SCATTERING (pbb));
 816
 817   /* Extend the iteration domain with the scattering dimensions:
 818      0..0 | 0..0 | i0..i_{niter-1} | g0..g_{nparm-1}.   */
 819   ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
 820     (&ext_domain, PBB_DOMAIN (pbb));
 821   ppl_insert_dimensions_pointset (ext_domain, 0,
 822                                   pbb_nb_scattering_transform (pbb)
 823                                   + pbb_nb_local_vars (pbb));
 824
 825   /* Add to sctr the extended domain.  */
 826   ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (sctr, ext_domain);
 827
 828   /* Extract the number of iterations.  */
 829   ppl_Pointset_Powerset_C_Polyhedron_space_dimension (sctr, &dim);
 830   ppl_new_Linear_Expression_with_dimension (&le, dim);
 831   ppl_set_coef (le, time_depth, 1);
 832   value_set_si (niter, -1);
 833   ppl_max_for_le_pointset (sctr, le, niter);
 834
 835   ppl_delete_Linear_Expression (le);
 836   ppl_delete_Pointset_Powerset_C_Polyhedron (sctr);
 837   ppl_delete_Pointset_Powerset_C_Polyhedron (ext_domain);
 838 }
 839
 840 /* Translates LOOP to LST.  */
 841
 842 static lst_p
 843 loop_to_lst (loop_p loop, VEC (poly_bb_p, heap) *bbs, int *i)
 844 {
 845   poly_bb_p pbb;
 846   VEC (lst_p, heap) *seq = VEC_alloc (lst_p, heap, 5);
 847
 848   for (; VEC_iterate (poly_bb_p, bbs, *i, pbb); (*i)++)
 849     {
 850       lst_p stmt;
 851       basic_block bb = GBB_BB (PBB_BLACK_BOX (pbb));
 852
 853       if (bb->loop_father == loop)
 854         stmt = new_lst_stmt (pbb);
 855       else if (flow_bb_inside_loop_p (loop, bb))
 856         {
 857           loop_p next = loop->inner;
 858
 859           while (next && !flow_bb_inside_loop_p (next, bb))
 860             next = next->next;
 861
 862           stmt = loop_to_lst (next, bbs, i);
 863         }
 864       else
 865         {
 866           (*i)--;
 867           return new_lst_loop (seq);
 868         }
 869
 870       VEC_safe_push (lst_p, heap, seq, stmt);
 871     }
 872
 873   return new_lst_loop (seq);
 874 }
 875
 876 /* Reads the original scattering of the SCOP and returns an LST
 877    representing it.  */
 878
 879 void
 880 scop_to_lst (scop_p scop)
 881 {
 882   lst_p res;
 883   int i, n = VEC_length (poly_bb_p, SCOP_BBS (scop));
 884   VEC (lst_p, heap) *seq = VEC_alloc (lst_p, heap, 5);
 885   sese region = SCOP_REGION (scop);
 886
 887   for (i = 0; i < n; i++)
 888     {
 889       poly_bb_p pbb = VEC_index (poly_bb_p, SCOP_BBS (scop), i);
 890       loop_p loop = outermost_loop_in_sese (region, GBB_BB (PBB_BLACK_BOX (pbb)));
 891
 892       if (loop_in_sese_p (loop, region))
 893         res = loop_to_lst (loop, SCOP_BBS (scop), &i);
 894       else
 895         res = new_lst_stmt (pbb);
 896
 897       VEC_safe_push (lst_p, heap, seq, res);
 898     }
 899
 900   res = new_lst_loop (seq);
 901   SCOP_ORIGINAL_SCHEDULE (scop) = res;
 902   SCOP_TRANSFORMED_SCHEDULE (scop) = copy_lst (res);
 903 }
 904
 905 /* Print LST to FILE with INDENT spaces of indentation.  */
 906
 907 void
 908 print_lst (FILE *file, lst_p lst, int indent)
 909 {
 910   if (!lst)
 911     return;
 912
 913   indent_to (file, indent);
 914
 915   if (LST_LOOP_P (lst))
 916     {
 917       int i;
 918       lst_p l;
 919
 920       if (LST_LOOP_FATHER (lst))
 921         fprintf (file, "%d (loop", lst_dewey_number (lst));
 922       else
 923         fprintf (file, "(root");
 924
 925       for (i = 0; VEC_iterate (lst_p, LST_SEQ (lst), i, l); i++)
 926         print_lst (file, l, indent + 2);
 927
 928       fprintf (file, ")");
 929     }
 930   else
 931     fprintf (file, "%d stmt_%d", lst_dewey_number (lst), pbb_index (LST_PBB (lst)));
 932 }
 933
 934 /* Print LST to STDERR.  */
 935
 936 void
 937 debug_lst (lst_p lst)
 938 {
 939   print_lst (stderr, lst, 0);
 940 }
 941
 942 /* Pretty print to FILE the loop statement tree LST in DOT format.  */
 943
 944 static void
 945 dot_lst_1 (FILE *file, lst_p lst)
 946 {
 947   if (!lst)
 948     return;
 949
 950   if (LST_LOOP_P (lst))
 951     {
 952       int i;
 953       lst_p l;
 954
 955       if (!LST_LOOP_FATHER (lst))
 956         fprintf (file, "L -> L_%d_%d\n",
 957                  lst_depth (lst),
 958                  lst_dewey_number (lst));
 959       else
 960         fprintf (file, "L_%d_%d -> L_%d_%d\n",
 961                  lst_depth (LST_LOOP_FATHER (lst)),
 962                  lst_dewey_number (LST_LOOP_FATHER (lst)),
 963                  lst_depth (lst),
 964                  lst_dewey_number (lst));
 965
 966       for (i = 0; VEC_iterate (lst_p, LST_SEQ (lst), i, l); i++)
 967         dot_lst_1 (file, l);
 968     }
 969
 970   else
 971     fprintf (file, "L_%d_%d -> S_%d\n",
 972              lst_depth (LST_LOOP_FATHER (lst)),
 973              lst_dewey_number (LST_LOOP_FATHER (lst)),
 974              pbb_index (LST_PBB (lst)));
 975
 976 }
 977
 978 /* Display the LST using dotty.  */
 979
 980 void
 981 dot_lst (lst_p lst)
 982 {
 983   /* When debugging, enable the following code.  This cannot be used
 984      in production compilers because it calls "system".  */
 985 #if 0
 986   int x;
 987   FILE *stream = fopen ("/tmp/lst.dot", "w");
 988   gcc_assert (stream);
 989
 990   fputs ("digraph all {\n", stream);
 991   dot_lst_1 (stream, lst);
 992   fputs ("}\n\n", stream);
 993   fclose (stream);
 994
 995   x = system ("dotty /tmp/lst.dot");
 996 #else
 997   fputs ("digraph all {\n", stderr);
 998   dot_lst_1 (stderr, lst);
 999   fputs ("}\n\n", stderr);
1000
1001 #endif
1002 }
1003
1004 #endif
1005