1 /* Data dependence analysis for Graphite.
2 Copyright (C) 2009, 2010 Free Software Foundation, Inc.
3 Contributed by Sebastian Pop <sebastian.pop@amd.com> and
4 Konrad Trifunovic <konrad.trifunovic@inria.fr>.
6 This file is part of GCC.
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)
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.
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/>. */
24 #include "coretypes.h"
25 #include "tree-flow.h"
26 #include "tree-dump.h"
28 #include "tree-chrec.h"
29 #include "tree-data-ref.h"
30 #include "tree-scalar-evolution.h"
35 #include "graphite-ppl.h"
36 #include "graphite-poly.h"
37 #include "graphite-dependences.h"
39 /* Returns a new polyhedral Data Dependence Relation (DDR). SOURCE is
40 the source data reference, SINK is the sink data reference. When
41 the Data Dependence Polyhedron DDP is not NULL or not empty, SOURCE
42 and SINK are in dependence as described by DDP. */
45 new_poly_ddr (poly_dr_p source, poly_dr_p sink,
46 ppl_Pointset_Powerset_C_Polyhedron_t ddp,
47 bool original_scattering_p)
49 poly_ddr_p pddr = XNEW (struct poly_ddr);
51 PDDR_SOURCE (pddr) = source;
52 PDDR_SINK (pddr) = sink;
53 PDDR_DDP (pddr) = ddp;
54 PDDR_ORIGINAL_SCATTERING_P (pddr) = original_scattering_p;
56 if (!ddp || ppl_Pointset_Powerset_C_Polyhedron_is_empty (ddp))
57 PDDR_KIND (pddr) = no_dependence;
59 PDDR_KIND (pddr) = has_dependence;
64 /* Free the poly_ddr_p P. */
67 free_poly_ddr (void *p)
69 poly_ddr_p pddr = (poly_ddr_p) p;
70 ppl_delete_Pointset_Powerset_C_Polyhedron (PDDR_DDP (pddr));
74 /* Comparison function for poly_ddr hash table. */
77 eq_poly_ddr_p (const void *pddr1, const void *pddr2)
79 const struct poly_ddr *p1 = (const struct poly_ddr *) pddr1;
80 const struct poly_ddr *p2 = (const struct poly_ddr *) pddr2;
82 return (PDDR_SOURCE (p1) == PDDR_SOURCE (p2)
83 && PDDR_SINK (p1) == PDDR_SINK (p2));
86 /* Hash function for poly_ddr hashtable. */
89 hash_poly_ddr_p (const void *pddr)
91 const struct poly_ddr *p = (const struct poly_ddr *) pddr;
93 return (hashval_t) ((long) PDDR_SOURCE (p) + (long) PDDR_SINK (p));
96 /* Returns true when PDDR has no dependence. */
99 pddr_is_empty (poly_ddr_p pddr)
104 gcc_assert (PDDR_KIND (pddr) != unknown_dependence);
106 return PDDR_KIND (pddr) == no_dependence ? true : false;
109 /* Prints to FILE the layout of the dependence polyhedron of PDDR:
114 | T1 and T2 the scattering dimensions for PDDR_SOURCE and PDDR_SINK
115 | I1 and I2 the iteration domains
116 | S1 and S2 the subscripts
117 | G the global parameters. */
120 print_dependence_polyhedron_layout (FILE *file, poly_ddr_p pddr)
122 poly_dr_p pdr1 = PDDR_SOURCE (pddr);
123 poly_dr_p pdr2 = PDDR_SINK (pddr);
124 poly_bb_p pbb1 = PDR_PBB (pdr1);
125 poly_bb_p pbb2 = PDR_PBB (pdr2);
128 graphite_dim_t tdim1 = PDDR_ORIGINAL_SCATTERING_P (pddr) ?
129 pbb_nb_scattering_orig (pbb1) : pbb_nb_scattering_transform (pbb1);
130 graphite_dim_t tdim2 = PDDR_ORIGINAL_SCATTERING_P (pddr) ?
131 pbb_nb_scattering_orig (pbb2) : pbb_nb_scattering_transform (pbb2);
132 graphite_dim_t idim1 = pbb_dim_iter_domain (pbb1);
133 graphite_dim_t idim2 = pbb_dim_iter_domain (pbb2);
134 graphite_dim_t sdim1 = PDR_NB_SUBSCRIPTS (pdr1) + 1;
135 graphite_dim_t sdim2 = PDR_NB_SUBSCRIPTS (pdr2) + 1;
136 graphite_dim_t gdim = scop_nb_params (PBB_SCOP (pbb1));
138 fprintf (file, "# eq");
140 for (i = 0; i < tdim1; i++)
141 fprintf (file, " t1_%d", (int) i);
142 for (i = 0; i < idim1; i++)
143 fprintf (file, " i1_%d", (int) i);
144 for (i = 0; i < tdim2; i++)
145 fprintf (file, " t2_%d", (int) i);
146 for (i = 0; i < idim2; i++)
147 fprintf (file, " i2_%d", (int) i);
148 for (i = 0; i < sdim1; i++)
149 fprintf (file, " s1_%d", (int) i);
150 for (i = 0; i < sdim2; i++)
151 fprintf (file, " s2_%d", (int) i);
152 for (i = 0; i < gdim; i++)
153 fprintf (file, " g_%d", (int) i);
155 fprintf (file, " cst\n");
158 /* Prints to FILE the poly_ddr_p PDDR. */
161 print_pddr (FILE *file, poly_ddr_p pddr)
163 fprintf (file, "pddr (kind: ");
165 if (PDDR_KIND (pddr) == unknown_dependence)
166 fprintf (file, "unknown_dependence");
167 else if (PDDR_KIND (pddr) == no_dependence)
168 fprintf (file, "no_dependence");
169 else if (PDDR_KIND (pddr) == has_dependence)
170 fprintf (file, "has_dependence");
172 fprintf (file, "\n source ");
173 print_pdr (file, PDDR_SOURCE (pddr), 2);
175 fprintf (file, "\n sink ");
176 print_pdr (file, PDDR_SINK (pddr), 2);
178 if (PDDR_KIND (pddr) == has_dependence)
180 fprintf (file, "\n dependence polyhedron (\n");
181 print_dependence_polyhedron_layout (file, pddr);
182 ppl_print_powerset_matrix (file, PDDR_DDP (pddr));
183 ppl_io_fprint_Pointset_Powerset_C_Polyhedron (file, PDDR_DDP (pddr));
184 fprintf (file, ")\n");
187 fprintf (file, ")\n");
190 /* Prints to STDERR the poly_ddr_p PDDR. */
193 debug_pddr (poly_ddr_p pddr)
195 print_pddr (stderr, pddr);
199 /* Remove all the dimensions except alias information at dimension
203 build_alias_set_powerset (ppl_Pointset_Powerset_C_Polyhedron_t alias_powerset,
204 ppl_dimension_type alias_dim)
206 ppl_dimension_type *ds;
207 ppl_dimension_type access_dim;
210 ppl_Pointset_Powerset_C_Polyhedron_space_dimension (alias_powerset,
212 ds = XNEWVEC (ppl_dimension_type, access_dim-1);
213 for (i = 0; i < access_dim; i++)
222 ppl_Pointset_Powerset_C_Polyhedron_remove_space_dimensions (alias_powerset,
228 /* Return true when PDR1 and PDR2 may alias. */
231 poly_drs_may_alias_p (poly_dr_p pdr1, poly_dr_p pdr2)
233 ppl_Pointset_Powerset_C_Polyhedron_t alias_powerset1, alias_powerset2;
234 ppl_Pointset_Powerset_C_Polyhedron_t accesses1 = PDR_ACCESSES (pdr1);
235 ppl_Pointset_Powerset_C_Polyhedron_t accesses2 = PDR_ACCESSES (pdr2);
236 ppl_dimension_type alias_dim1 = pdr_alias_set_dim (pdr1);
237 ppl_dimension_type alias_dim2 = pdr_alias_set_dim (pdr2);
240 ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
241 (&alias_powerset1, accesses1);
242 ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
243 (&alias_powerset2, accesses2);
245 build_alias_set_powerset (alias_powerset1, alias_dim1);
246 build_alias_set_powerset (alias_powerset2, alias_dim2);
248 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign
249 (alias_powerset1, alias_powerset2);
251 empty_p = ppl_Pointset_Powerset_C_Polyhedron_is_empty (alias_powerset1);
253 ppl_delete_Pointset_Powerset_C_Polyhedron (alias_powerset1);
254 ppl_delete_Pointset_Powerset_C_Polyhedron (alias_powerset2);
259 /* Swap [cut0, ..., cut1] to the end of DR: "a CUT0 b CUT1 c" is
260 transformed into "a CUT0 c CUT1' b"
262 Add NB0 zeros before "a": "00...0 a CUT0 c CUT1' b"
263 Add NB1 zeros between "a" and "c": "00...0 a 00...0 c CUT1' b"
264 Add DIM - NB0 - NB1 - PDIM zeros between "c" and "b":
265 "00...0 a 00...0 c 00...0 b". */
267 static ppl_Pointset_Powerset_C_Polyhedron_t
268 map_dr_into_dep_poly (graphite_dim_t dim,
269 ppl_Pointset_Powerset_C_Polyhedron_t dr,
270 graphite_dim_t cut0, graphite_dim_t cut1,
271 graphite_dim_t nb0, graphite_dim_t nb1)
273 ppl_dimension_type pdim;
274 ppl_dimension_type *map;
275 ppl_Pointset_Powerset_C_Polyhedron_t res;
276 ppl_dimension_type i;
278 ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
280 ppl_Pointset_Powerset_C_Polyhedron_space_dimension (res, &pdim);
282 map = (ppl_dimension_type *) XNEWVEC (ppl_dimension_type, pdim);
284 /* First mapping: move 'g' vector to right position. */
285 for (i = 0; i < cut0; i++)
288 for (i = cut0; i < cut1; i++)
289 map[i] = pdim - cut1 + i;
291 for (i = cut1; i < pdim; i++)
292 map[i] = cut0 + i - cut1;
294 ppl_Pointset_Powerset_C_Polyhedron_map_space_dimensions (res, map, pdim);
297 /* After swapping 's' and 'g' vectors, we have to update a new cut. */
298 cut1 = pdim - cut1 + cut0;
300 ppl_insert_dimensions_pointset (res, 0, nb0);
301 ppl_insert_dimensions_pointset (res, nb0 + cut0, nb1);
302 ppl_insert_dimensions_pointset (res, nb0 + nb1 + cut1,
303 dim - nb0 - nb1 - pdim);
308 /* Builds subscript equality constraints. */
310 static ppl_Pointset_Powerset_C_Polyhedron_t
311 dr_equality_constraints (graphite_dim_t dim,
312 graphite_dim_t pos, graphite_dim_t nb_subscripts)
314 ppl_Polyhedron_t eqs;
315 ppl_Pointset_Powerset_C_Polyhedron_t res;
318 ppl_new_C_Polyhedron_from_space_dimension (&eqs, dim, 0);
320 for (i = 0; i < nb_subscripts; i++)
322 ppl_Constraint_t cstr
323 = ppl_build_relation (dim, pos + i, pos + i + nb_subscripts,
324 0, PPL_CONSTRAINT_TYPE_EQUAL);
325 ppl_Polyhedron_add_constraint (eqs, cstr);
326 ppl_delete_Constraint (cstr);
329 ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron (&res, eqs);
330 ppl_delete_Polyhedron (eqs);
334 /* Builds scheduling inequality constraints: when DIRECTION is
335 1 builds a GE constraint,
336 0 builds an EQ constraint,
337 -1 builds a LE constraint.
338 DIM is the dimension of the scheduling space.
339 POS and POS + OFFSET are the dimensions that are related. */
341 static ppl_Pointset_Powerset_C_Polyhedron_t
342 build_pairwise_scheduling (graphite_dim_t dim,
344 graphite_dim_t offset,
347 ppl_Pointset_Powerset_C_Polyhedron_t res;
348 ppl_Polyhedron_t equalities;
349 ppl_Constraint_t cstr;
351 ppl_new_C_Polyhedron_from_space_dimension (&equalities, dim, 0);
356 cstr = ppl_build_relation (dim, pos, pos + offset, 1,
357 PPL_CONSTRAINT_TYPE_LESS_OR_EQUAL);
361 cstr = ppl_build_relation (dim, pos, pos + offset, 0,
362 PPL_CONSTRAINT_TYPE_EQUAL);
366 cstr = ppl_build_relation (dim, pos, pos + offset, -1,
367 PPL_CONSTRAINT_TYPE_GREATER_OR_EQUAL);
374 ppl_Polyhedron_add_constraint (equalities, cstr);
375 ppl_delete_Constraint (cstr);
377 ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron (&res, equalities);
378 ppl_delete_Polyhedron (equalities);
382 /* Add to a non empty polyhedron BAG the precedence constraints for
383 the lexicographical comparison of time vectors in BAG following the
384 lexicographical order. DIM is the dimension of the polyhedron BAG.
385 TDIM is the number of loops common to the two statements that are
386 compared lexicographically, i.e. the number of loops containing
387 both statements. OFFSET is the number of dimensions needed to
388 represent the first statement, i.e. dimT1 + dimI1 in the layout of
389 the BAG polyhedron: T1|I1|T2|I2|S1|S2|G. When DIRECTION is set to
390 1, compute the direct dependence from PDR1 to PDR2, and when
391 DIRECTION is -1, compute the reversed dependence relation, from
394 static ppl_Pointset_Powerset_C_Polyhedron_t
395 build_lexicographical_constraint (ppl_Pointset_Powerset_C_Polyhedron_t bag,
398 graphite_dim_t offset,
402 ppl_Pointset_Powerset_C_Polyhedron_t res, lex;
404 ppl_new_Pointset_Powerset_C_Polyhedron_from_space_dimension (&res, dim, 1);
406 lex = build_pairwise_scheduling (dim, 0, offset, direction);
407 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (lex, bag);
409 if (!ppl_Pointset_Powerset_C_Polyhedron_is_empty (lex))
410 ppl_Pointset_Powerset_C_Polyhedron_upper_bound_assign (res, lex);
412 ppl_delete_Pointset_Powerset_C_Polyhedron (lex);
414 for (i = 0; i < tdim - 1; i++)
416 ppl_Pointset_Powerset_C_Polyhedron_t sceq;
418 sceq = build_pairwise_scheduling (dim, i, offset, 0);
419 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (bag, sceq);
420 ppl_delete_Pointset_Powerset_C_Polyhedron (sceq);
422 if (ppl_Pointset_Powerset_C_Polyhedron_is_empty (bag))
425 lex = build_pairwise_scheduling (dim, i + 1, offset, direction);
426 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (lex, bag);
428 if (!ppl_Pointset_Powerset_C_Polyhedron_is_empty (lex))
429 ppl_Pointset_Powerset_C_Polyhedron_upper_bound_assign (res, lex);
431 ppl_delete_Pointset_Powerset_C_Polyhedron (lex);
437 /* Build the dependence polyhedron for data references PDR1 and PDR2.
438 The layout of the dependence polyhedron is:
443 | T1 and T2 the scattering dimensions for PDR1 and PDR2
444 | I1 and I2 the iteration domains
445 | S1 and S2 the subscripts
446 | G the global parameters.
448 When DIRECTION is set to 1, compute the direct dependence from PDR1
449 to PDR2, and when DIRECTION is -1, compute the reversed dependence
450 relation, from PDR2 to PDR1. */
452 static ppl_Pointset_Powerset_C_Polyhedron_t
453 dependence_polyhedron_1 (poly_dr_p pdr1, poly_dr_p pdr2,
454 int direction, bool original_scattering_p)
456 poly_bb_p pbb1 = PDR_PBB (pdr1);
457 poly_bb_p pbb2 = PDR_PBB (pdr2);
458 scop_p scop = PBB_SCOP (pbb1);
459 graphite_dim_t tdim1 = original_scattering_p ?
460 pbb_nb_scattering_orig (pbb1) : pbb_nb_scattering_transform (pbb1);
461 graphite_dim_t tdim2 = original_scattering_p ?
462 pbb_nb_scattering_orig (pbb2) : pbb_nb_scattering_transform (pbb2);
463 graphite_dim_t ddim1 = pbb_dim_iter_domain (pbb1);
464 graphite_dim_t ddim2 = pbb_dim_iter_domain (pbb2);
465 graphite_dim_t sdim1 = PDR_NB_SUBSCRIPTS (pdr1) + 1;
466 graphite_dim_t sdim2 = PDR_NB_SUBSCRIPTS (pdr2) + 1;
467 graphite_dim_t gdim = scop_nb_params (scop);
468 graphite_dim_t dim1 = pdr_dim (pdr1);
469 graphite_dim_t dim2 = pdr_dim (pdr2);
470 graphite_dim_t dim = tdim1 + tdim2 + dim1 + dim2 - gdim;
471 ppl_Pointset_Powerset_C_Polyhedron_t res;
472 ppl_Pointset_Powerset_C_Polyhedron_t idr1, idr2;
473 ppl_Pointset_Powerset_C_Polyhedron_t sc1, sc2, dreq;
475 gcc_assert (PBB_SCOP (pbb1) == PBB_SCOP (pbb2));
477 combine_context_id_scat (&sc1, pbb1, original_scattering_p);
478 combine_context_id_scat (&sc2, pbb2, original_scattering_p);
480 ppl_insert_dimensions_pointset (sc1, tdim1 + ddim1,
481 tdim2 + ddim2 + sdim1 + sdim2);
483 ppl_insert_dimensions_pointset (sc2, 0, tdim1 + ddim1);
484 ppl_insert_dimensions_pointset (sc2, tdim1 + ddim1 + tdim2 + ddim2,
487 idr1 = map_dr_into_dep_poly (dim, PDR_ACCESSES (pdr1), ddim1, ddim1 + gdim,
488 tdim1, tdim2 + ddim2);
489 idr2 = map_dr_into_dep_poly (dim, PDR_ACCESSES (pdr2), ddim2, ddim2 + gdim,
490 tdim1 + ddim1 + tdim2, sdim1);
492 /* Now add the subscript equalities. */
493 dreq = dr_equality_constraints (dim, tdim1 + ddim1 + tdim2 + ddim2, sdim1);
495 ppl_new_Pointset_Powerset_C_Polyhedron_from_space_dimension (&res, dim, 0);
496 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res, sc1);
497 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res, sc2);
498 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res, idr1);
499 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res, idr2);
500 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res, dreq);
501 ppl_delete_Pointset_Powerset_C_Polyhedron (sc1);
502 ppl_delete_Pointset_Powerset_C_Polyhedron (sc2);
503 ppl_delete_Pointset_Powerset_C_Polyhedron (idr1);
504 ppl_delete_Pointset_Powerset_C_Polyhedron (idr2);
505 ppl_delete_Pointset_Powerset_C_Polyhedron (dreq);
507 if (!ppl_Pointset_Powerset_C_Polyhedron_is_empty (res))
509 ppl_Pointset_Powerset_C_Polyhedron_t lex =
510 build_lexicographical_constraint (res, dim, MIN (tdim1, tdim2),
511 tdim1 + ddim1, direction);
512 ppl_delete_Pointset_Powerset_C_Polyhedron (res);
519 /* Build the dependence polyhedron for data references PDR1 and PDR2.
520 If possible use already cached information.
522 When DIRECTION is set to 1, compute the direct dependence from PDR1
523 to PDR2, and when DIRECTION is -1, compute the reversed dependence
524 relation, from PDR2 to PDR1. */
527 dependence_polyhedron (poly_dr_p pdr1, poly_dr_p pdr2,
528 int direction, bool original_scattering_p)
532 ppl_Pointset_Powerset_C_Polyhedron_t ddp;
534 /* Return the PDDR from the cache if it already has been computed. */
535 if (original_scattering_p)
538 scop_p scop = PBB_SCOP (PDR_PBB (pdr1));
542 x = htab_find_slot (SCOP_ORIGINAL_PDDRS (scop),
546 return (poly_ddr_p) *x;
549 if ((pdr_read_p (pdr1) && pdr_read_p (pdr2))
550 || PDR_BASE_OBJECT_SET (pdr1) != PDR_BASE_OBJECT_SET (pdr2)
551 || PDR_NB_SUBSCRIPTS (pdr1) != PDR_NB_SUBSCRIPTS (pdr2)
552 || !poly_drs_may_alias_p (pdr1, pdr2))
555 ddp = dependence_polyhedron_1 (pdr1, pdr2, direction,
556 original_scattering_p);
558 res = new_poly_ddr (pdr1, pdr2, ddp, original_scattering_p);
560 if (!(pdr_read_p (pdr1) && pdr_read_p (pdr2))
561 && PDR_BASE_OBJECT_SET (pdr1) != PDR_BASE_OBJECT_SET (pdr2)
562 && poly_drs_may_alias_p (pdr1, pdr2))
563 PDDR_KIND (res) = unknown_dependence;
565 if (original_scattering_p)
571 /* Return true when the data dependence relation between the data
572 references PDR1 belonging to PBB1 and PDR2 is part of a
576 reduction_dr_1 (poly_bb_p pbb1, poly_dr_p pdr1, poly_dr_p pdr2)
581 FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb1), i, pdr)
582 if (PDR_TYPE (pdr) == PDR_WRITE)
585 return same_pdr_p (pdr, pdr1) && same_pdr_p (pdr, pdr2);
588 /* Return true when the data dependence relation between the data
589 references PDR1 belonging to PBB1 and PDR2 belonging to PBB2 is
590 part of a reduction. */
593 reduction_dr_p (poly_dr_p pdr1, poly_dr_p pdr2)
595 poly_bb_p pbb1 = PDR_PBB (pdr1);
596 poly_bb_p pbb2 = PDR_PBB (pdr2);
598 if (PBB_IS_REDUCTION (pbb1))
599 return reduction_dr_1 (pbb1, pdr1, pdr2);
601 if (PBB_IS_REDUCTION (pbb2))
602 return reduction_dr_1 (pbb2, pdr2, pdr1);
607 /* Returns true when the PBB_TRANSFORMED_SCATTERING functions of PBB1
608 and PBB2 respect the data dependences of PBB_ORIGINAL_SCATTERING
612 graphite_legal_transform_dr (poly_dr_p pdr1, poly_dr_p pdr2)
614 ppl_Pointset_Powerset_C_Polyhedron_t po, pt;
615 graphite_dim_t ddim1, otdim1, otdim2, ttdim1, ttdim2;
616 ppl_Pointset_Powerset_C_Polyhedron_t po_temp;
617 ppl_dimension_type pdim;
619 poly_ddr_p opddr, tpddr;
620 poly_bb_p pbb1, pbb2;
622 if (reduction_dr_p (pdr1, pdr2))
625 /* We build the reverse dependence relation for the transformed
626 scattering, such that when we intersect it with the original PO,
627 we get an empty intersection when the transform is legal:
628 i.e. the transform should reverse no dependences, and so PT, the
629 reversed transformed PDDR, should have no constraint from PO. */
630 opddr = dependence_polyhedron (pdr1, pdr2, 1, true);
632 if (PDDR_KIND (opddr) == unknown_dependence)
635 /* There are no dependences between PDR1 and PDR2 in the original
636 version of the program, or after the transform, so the
637 transform is legal. */
638 if (pddr_is_empty (opddr))
641 tpddr = dependence_polyhedron (pdr1, pdr2, -1, false);
643 if (PDDR_KIND (tpddr) == unknown_dependence)
645 free_poly_ddr (tpddr);
649 if (pddr_is_empty (tpddr))
651 free_poly_ddr (tpddr);
655 po = PDDR_DDP (opddr);
656 pt = PDDR_DDP (tpddr);
658 /* Copy PO into PO_TEMP, such that PO is not destroyed. PO is
659 stored in a cache and should not be modified or freed. */
660 ppl_Pointset_Powerset_C_Polyhedron_space_dimension (po, &pdim);
661 ppl_new_Pointset_Powerset_C_Polyhedron_from_space_dimension (&po_temp,
663 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (po_temp, po);
665 /* Extend PO and PT to have the same dimensions. */
666 pbb1 = PDR_PBB (pdr1);
667 pbb2 = PDR_PBB (pdr2);
668 ddim1 = pbb_dim_iter_domain (pbb1);
669 otdim1 = pbb_nb_scattering_orig (pbb1);
670 otdim2 = pbb_nb_scattering_orig (pbb2);
671 ttdim1 = pbb_nb_scattering_transform (pbb1);
672 ttdim2 = pbb_nb_scattering_transform (pbb2);
673 ppl_insert_dimensions_pointset (po_temp, otdim1, ttdim1);
674 ppl_insert_dimensions_pointset (po_temp, otdim1 + ttdim1 + ddim1 + otdim2,
676 ppl_insert_dimensions_pointset (pt, 0, otdim1);
677 ppl_insert_dimensions_pointset (pt, otdim1 + ttdim1 + ddim1, otdim2);
679 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (po_temp, pt);
680 is_empty_p = ppl_Pointset_Powerset_C_Polyhedron_is_empty (po_temp);
682 ppl_delete_Pointset_Powerset_C_Polyhedron (po_temp);
683 free_poly_ddr (tpddr);
685 if (dump_file && (dump_flags & TDF_DETAILS))
686 fprintf (dump_file, "\nloop carries dependency.\n");
691 /* Return true when the data dependence relation for PBB1 and PBB2 is
692 part of a reduction. */
695 reduction_ddr_p (poly_bb_p pbb1, poly_bb_p pbb2)
697 return pbb1 == pbb2 && PBB_IS_REDUCTION (pbb1);
700 /* Iterates over the data references of PBB1 and PBB2 and detect
701 whether the transformed schedule is correct. */
704 graphite_legal_transform_bb (poly_bb_p pbb1, poly_bb_p pbb2)
707 poly_dr_p pdr1, pdr2;
709 if (!PBB_PDR_DUPLICATES_REMOVED (pbb1))
710 pbb_remove_duplicate_pdrs (pbb1);
712 if (!PBB_PDR_DUPLICATES_REMOVED (pbb2))
713 pbb_remove_duplicate_pdrs (pbb2);
715 if (reduction_ddr_p (pbb1, pbb2))
718 FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb1), i, pdr1)
719 FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb2), j, pdr2)
720 if (!graphite_legal_transform_dr (pdr1, pdr2))
726 /* Iterates over the SCOP and detect whether the transformed schedule
730 graphite_legal_transform (scop_p scop)
733 poly_bb_p pbb1, pbb2;
735 timevar_push (TV_GRAPHITE_DATA_DEPS);
737 FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), i, pbb1)
738 FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), j, pbb2)
739 if (!graphite_legal_transform_bb (pbb1, pbb2))
741 timevar_pop (TV_GRAPHITE_DATA_DEPS);
745 timevar_pop (TV_GRAPHITE_DATA_DEPS);
749 /* Returns TRUE when the dependence polyhedron between PDR1 and
750 PDR2 represents a loop carried dependence at level LEVEL. */
753 graphite_carried_dependence_level_k (poly_dr_p pdr1, poly_dr_p pdr2,
756 ppl_Pointset_Powerset_C_Polyhedron_t po;
757 ppl_Pointset_Powerset_C_Polyhedron_t eqpp;
758 graphite_dim_t tdim1 = pbb_nb_scattering_transform (PDR_PBB (pdr1));
759 graphite_dim_t ddim1 = pbb_dim_iter_domain (PDR_PBB (pdr1));
760 ppl_dimension_type dim;
762 poly_ddr_p pddr = dependence_polyhedron (pdr1, pdr2, 1, false);
764 if (PDDR_KIND (pddr) == unknown_dependence)
766 free_poly_ddr (pddr);
770 if (pddr_is_empty (pddr))
772 free_poly_ddr (pddr);
776 po = PDDR_DDP (pddr);
777 ppl_Pointset_Powerset_C_Polyhedron_space_dimension (po, &dim);
778 eqpp = build_pairwise_scheduling (dim, level, tdim1 + ddim1, 1);
780 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (eqpp, po);
781 empty_p = ppl_Pointset_Powerset_C_Polyhedron_is_empty (eqpp);
783 ppl_delete_Pointset_Powerset_C_Polyhedron (eqpp);
784 free_poly_ddr (pddr);
789 /* Check data dependency between PBB1 and PBB2 at level LEVEL. */
792 dependency_between_pbbs_p (poly_bb_p pbb1, poly_bb_p pbb2, int level)
795 poly_dr_p pdr1, pdr2;
797 timevar_push (TV_GRAPHITE_DATA_DEPS);
799 FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb1), i, pdr1)
800 FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb2), j, pdr2)
801 if (graphite_carried_dependence_level_k (pdr1, pdr2, level))
803 timevar_pop (TV_GRAPHITE_DATA_DEPS);
807 timevar_pop (TV_GRAPHITE_DATA_DEPS);
811 /* Pretty print to FILE all the original data dependences of SCoP in
815 dot_original_deps_stmt_1 (FILE *file, scop_p scop)
818 poly_bb_p pbb1, pbb2;
819 poly_dr_p pdr1, pdr2;
821 FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), i, pbb1)
822 FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), j, pbb2)
824 FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb1), k, pdr1)
825 FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb2), l, pdr2)
826 if (!pddr_is_empty (dependence_polyhedron (pdr1, pdr2, 1, true)))
828 fprintf (file, "OS%d -> OS%d\n",
829 pbb_index (pbb1), pbb_index (pbb2));
836 /* Pretty print to FILE all the transformed data dependences of SCoP in
840 dot_transformed_deps_stmt_1 (FILE *file, scop_p scop)
843 poly_bb_p pbb1, pbb2;
844 poly_dr_p pdr1, pdr2;
846 FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), i, pbb1)
847 FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), j, pbb2)
849 FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb1), k, pdr1)
850 FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb2), l, pdr2)
852 poly_ddr_p pddr = dependence_polyhedron (pdr1, pdr2, 1, false);
854 if (!pddr_is_empty (pddr))
856 fprintf (file, "TS%d -> TS%d\n",
857 pbb_index (pbb1), pbb_index (pbb2));
859 free_poly_ddr (pddr);
863 free_poly_ddr (pddr);
870 /* Pretty print to FILE all the data dependences of SCoP in DOT
874 dot_deps_stmt_1 (FILE *file, scop_p scop)
876 fputs ("digraph all {\n", file);
878 dot_original_deps_stmt_1 (file, scop);
879 dot_transformed_deps_stmt_1 (file, scop);
881 fputs ("}\n\n", file);
884 /* Pretty print to FILE all the original data dependences of SCoP in
888 dot_original_deps (FILE *file, scop_p scop)
891 poly_bb_p pbb1, pbb2;
892 poly_dr_p pdr1, pdr2;
894 FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), i, pbb1)
895 FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), j, pbb2)
896 FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb1), k, pdr1)
897 FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb2), l, pdr2)
898 if (!pddr_is_empty (dependence_polyhedron (pdr1, pdr2, 1, true)))
899 fprintf (file, "OS%d_D%d -> OS%d_D%d\n",
900 pbb_index (pbb1), PDR_ID (pdr1),
901 pbb_index (pbb2), PDR_ID (pdr2));
904 /* Pretty print to FILE all the transformed data dependences of SCoP in
908 dot_transformed_deps (FILE *file, scop_p scop)
911 poly_bb_p pbb1, pbb2;
912 poly_dr_p pdr1, pdr2;
914 FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), i, pbb1)
915 FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), j, pbb2)
916 FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb1), k, pdr1)
917 FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb2), l, pdr2)
919 poly_ddr_p pddr = dependence_polyhedron (pdr1, pdr2, 1, false);
921 if (!pddr_is_empty (pddr))
922 fprintf (file, "TS%d_D%d -> TS%d_D%d\n",
923 pbb_index (pbb1), PDR_ID (pdr1),
924 pbb_index (pbb2), PDR_ID (pdr2));
926 free_poly_ddr (pddr);
930 /* Pretty print to FILE all the data dependences of SCoP in DOT
934 dot_deps_1 (FILE *file, scop_p scop)
936 fputs ("digraph all {\n", file);
938 dot_original_deps (file, scop);
939 dot_transformed_deps (file, scop);
941 fputs ("}\n\n", file);
944 /* Display all the data dependences in SCoP using dotty. */
947 dot_deps (scop_p scop)
949 /* When debugging, enable the following code. This cannot be used
950 in production compilers because it calls "system". */
952 FILE *stream = fopen ("/tmp/scopdeps.dot", "w");
955 dot_deps_1 (stream, scop);
958 system ("dotty /tmp/scopdeps.dot &");
960 dot_deps_1 (stderr, scop);
964 /* Display all the statement dependences in SCoP using dotty. */
967 dot_deps_stmt (scop_p scop)
969 /* When debugging, enable the following code. This cannot be used
970 in production compilers because it calls "system". */
972 FILE *stream = fopen ("/tmp/scopdeps.dot", "w");
975 dot_deps_stmt_1 (stream, scop);
978 system ("dotty /tmp/scopdeps.dot &");
980 dot_deps_stmt_1 (stderr, scop);