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