1 /* Data dependence analysis for Graphite.
2 Copyright (C) 2009 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"
29 #include "basic-block.h"
30 #include "diagnostic.h"
31 #include "tree-flow.h"
33 #include "tree-dump.h"
36 #include "tree-chrec.h"
37 #include "tree-data-ref.h"
38 #include "tree-scalar-evolution.h"
39 #include "tree-pass.h"
41 #include "pointer-set.h"
45 #include "cloog/cloog.h"
48 #include "graphite-ppl.h"
50 #include "graphite-poly.h"
51 #include "graphite-dependences.h"
53 /* Returns a new polyhedral Data Dependence Relation (DDR). SOURCE is
54 the source data reference, SINK is the sink data reference. SOURCE
55 and SINK define an edge in the Data Dependence Graph (DDG). */
58 new_poly_ddr (poly_dr_p source
, poly_dr_p sink
,
59 ppl_Pointset_Powerset_C_Polyhedron_t ddp
)
63 pddr
= XNEW (struct poly_ddr
);
64 PDDR_SOURCE (pddr
) = source
;
65 PDDR_SINK (pddr
) = sink
;
66 PDDR_DDP (pddr
) = ddp
;
67 PDDR_KIND (pddr
) = unknown_dependence
;
72 /* Free the poly_ddr_p P. */
75 free_poly_ddr (void *p
)
77 poly_ddr_p pddr
= (poly_ddr_p
) p
;
78 ppl_delete_Pointset_Powerset_C_Polyhedron (PDDR_DDP (pddr
));
82 /* Comparison function for poly_ddr hash table. */
85 eq_poly_ddr_p (const void *pddr1
, const void *pddr2
)
87 const struct poly_ddr
*p1
= (const struct poly_ddr
*) pddr1
;
88 const struct poly_ddr
*p2
= (const struct poly_ddr
*) pddr2
;
90 return (PDDR_SOURCE (p1
) == PDDR_SOURCE (p2
)
91 && PDDR_SINK (p1
) == PDDR_SINK (p2
));
94 /* Hash function for poly_ddr hashtable. */
97 hash_poly_ddr_p (const void *pddr
)
99 const struct poly_ddr
*p
= (const struct poly_ddr
*) pddr
;
101 return (hashval_t
) ((long) PDDR_SOURCE (p
) + (long) PDDR_SINK (p
));
104 /* Returns true when PDDR has no dependence. */
107 pddr_is_empty (poly_ddr_p pddr
)
109 if (PDDR_KIND (pddr
) != unknown_dependence
)
110 return PDDR_KIND (pddr
) == no_dependence
? true : false;
112 if (ppl_Pointset_Powerset_C_Polyhedron_is_empty (PDDR_DDP (pddr
)))
114 PDDR_KIND (pddr
) = no_dependence
;
118 PDDR_KIND (pddr
) = has_dependence
;
122 /* Returns a polyhedron of dimension DIM.
124 Maps the dimensions [0, ..., cut - 1] of polyhedron P to OFFSET0
125 and the dimensions [cut, ..., nb_dim] to DIM - GDIM. */
127 static ppl_Pointset_Powerset_C_Polyhedron_t
128 map_into_dep_poly (graphite_dim_t dim
, graphite_dim_t gdim
,
129 ppl_Pointset_Powerset_C_Polyhedron_t p
,
131 graphite_dim_t offset
)
133 ppl_Pointset_Powerset_C_Polyhedron_t res
;
135 ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
137 ppl_insert_dimensions_pointset (res
, 0, offset
);
138 ppl_insert_dimensions_pointset (res
, offset
+ cut
,
139 dim
- offset
- cut
- gdim
);
144 /* Swap [cut0, ..., cut1] to the end of DR: "a CUT0 b CUT1 c" is
145 transformed into "a CUT0 c CUT1' b"
147 Add NB0 zeros before "a": "00...0 a CUT0 c CUT1' b"
148 Add NB1 zeros between "a" and "c": "00...0 a 00...0 c CUT1' b"
149 Add DIM - NB0 - NB1 - PDIM zeros between "c" and "b":
150 "00...0 a 00...0 c 00...0 b". */
152 static ppl_Pointset_Powerset_C_Polyhedron_t
153 map_dr_into_dep_poly (graphite_dim_t dim
,
154 ppl_Pointset_Powerset_C_Polyhedron_t dr
,
155 graphite_dim_t cut0
, graphite_dim_t cut1
,
156 graphite_dim_t nb0
, graphite_dim_t nb1
)
158 ppl_dimension_type pdim
;
159 ppl_dimension_type
*map
;
160 ppl_Pointset_Powerset_C_Polyhedron_t res
;
161 ppl_dimension_type i
;
163 ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
165 ppl_Pointset_Powerset_C_Polyhedron_space_dimension (res
, &pdim
);
167 map
= (ppl_dimension_type
*) XNEWVEC (ppl_dimension_type
, pdim
);
169 /* First mapping: move 'g' vector to right position. */
170 for (i
= 0; i
< cut0
; i
++)
173 for (i
= cut0
; i
< cut1
; i
++)
174 map
[i
] = pdim
- cut1
+ i
;
176 for (i
= cut1
; i
< pdim
; i
++)
177 map
[i
] = cut0
+ i
- cut1
;
179 ppl_Pointset_Powerset_C_Polyhedron_map_space_dimensions (res
, map
, pdim
);
182 /* After swapping 's' and 'g' vectors, we have to update a new cut. */
183 cut1
= pdim
- cut1
+ cut0
;
185 ppl_insert_dimensions_pointset (res
, 0, nb0
);
186 ppl_insert_dimensions_pointset (res
, nb0
+ cut0
, nb1
);
187 ppl_insert_dimensions_pointset (res
, nb0
+ nb1
+ cut1
,
188 dim
- nb0
- nb1
- pdim
);
193 /* Builds a constraints of the form "POS1 - POS2 CSTR_TYPE C" */
195 static ppl_Constraint_t
196 build_pairwise_constraint (graphite_dim_t dim
,
197 graphite_dim_t pos1
, graphite_dim_t pos2
,
198 int c
, enum ppl_enum_Constraint_Type cstr_type
)
200 ppl_Linear_Expression_t expr
;
201 ppl_Constraint_t cstr
;
202 ppl_Coefficient_t coef
;
210 value_set_si (v_op
, -1);
211 value_set_si (v_c
, c
);
213 ppl_new_Coefficient (&coef
);
214 ppl_new_Linear_Expression_with_dimension (&expr
, dim
);
216 ppl_assign_Coefficient_from_mpz_t (coef
, v
);
217 ppl_Linear_Expression_add_to_coefficient (expr
, pos1
, coef
);
218 ppl_assign_Coefficient_from_mpz_t (coef
, v_op
);
219 ppl_Linear_Expression_add_to_coefficient (expr
, pos2
, coef
);
220 ppl_assign_Coefficient_from_mpz_t (coef
, v_c
);
221 ppl_Linear_Expression_add_to_inhomogeneous (expr
, coef
);
223 ppl_new_Constraint (&cstr
, expr
, cstr_type
);
225 ppl_delete_Linear_Expression (expr
);
226 ppl_delete_Coefficient (coef
);
234 /* Builds subscript equality constraints. */
236 static ppl_Pointset_Powerset_C_Polyhedron_t
237 dr_equality_constraints (graphite_dim_t dim
,
238 graphite_dim_t pos
, graphite_dim_t nb_subscripts
)
240 ppl_Polyhedron_t subscript_equalities
;
241 ppl_Pointset_Powerset_C_Polyhedron_t res
;
248 value_set_si (v_op
, -1);
250 ppl_new_C_Polyhedron_from_space_dimension (&subscript_equalities
, dim
, 0);
251 for (i
= 0; i
< nb_subscripts
; i
++)
253 ppl_Linear_Expression_t expr
;
254 ppl_Constraint_t cstr
;
255 ppl_Coefficient_t coef
;
257 ppl_new_Coefficient (&coef
);
258 ppl_new_Linear_Expression_with_dimension (&expr
, dim
);
260 ppl_assign_Coefficient_from_mpz_t (coef
, v
);
261 ppl_Linear_Expression_add_to_coefficient (expr
, pos
+ i
, coef
);
262 ppl_assign_Coefficient_from_mpz_t (coef
, v_op
);
263 ppl_Linear_Expression_add_to_coefficient (expr
, pos
+ i
+ nb_subscripts
,
266 ppl_new_Constraint (&cstr
, expr
, PPL_CONSTRAINT_TYPE_EQUAL
);
267 ppl_Polyhedron_add_constraint (subscript_equalities
, cstr
);
269 ppl_delete_Linear_Expression (expr
);
270 ppl_delete_Constraint (cstr
);
271 ppl_delete_Coefficient (coef
);
274 ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron
275 (&res
, subscript_equalities
);
278 ppl_delete_Polyhedron (subscript_equalities
);
283 /* Builds scheduling equality constraints. */
285 static ppl_Pointset_Powerset_C_Polyhedron_t
286 build_pairwise_scheduling_equality (graphite_dim_t dim
,
287 graphite_dim_t pos
, graphite_dim_t offset
)
289 ppl_Pointset_Powerset_C_Polyhedron_t res
;
290 ppl_Polyhedron_t equalities
;
291 ppl_Constraint_t cstr
;
293 ppl_new_C_Polyhedron_from_space_dimension (&equalities
, dim
, 0);
295 cstr
= build_pairwise_constraint (dim
, pos
, pos
+ offset
, 0,
296 PPL_CONSTRAINT_TYPE_EQUAL
);
297 ppl_Polyhedron_add_constraint (equalities
, cstr
);
298 ppl_delete_Constraint (cstr
);
300 ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron (&res
, equalities
);
301 ppl_delete_Polyhedron (equalities
);
305 /* Builds scheduling inequality constraints. */
307 static ppl_Pointset_Powerset_C_Polyhedron_t
308 build_pairwise_scheduling_inequality (graphite_dim_t dim
,
310 graphite_dim_t offset
,
313 ppl_Pointset_Powerset_C_Polyhedron_t res
;
314 ppl_Polyhedron_t equalities
;
315 ppl_Constraint_t cstr
;
317 ppl_new_C_Polyhedron_from_space_dimension (&equalities
, dim
, 0);
320 cstr
= build_pairwise_constraint (dim
, pos
, pos
+ offset
, -1,
321 PPL_CONSTRAINT_TYPE_GREATER_OR_EQUAL
);
323 cstr
= build_pairwise_constraint (dim
, pos
, pos
+ offset
, 1,
324 PPL_CONSTRAINT_TYPE_LESS_OR_EQUAL
);
326 ppl_Polyhedron_add_constraint (equalities
, cstr
);
327 ppl_delete_Constraint (cstr
);
329 ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron (&res
, equalities
);
330 ppl_delete_Polyhedron (equalities
);
334 /* Returns true when adding the lexicographical constraints at level I
335 to the RES dependence polyhedron returns an empty polyhedron. */
338 lexicographically_gt_p (ppl_Pointset_Powerset_C_Polyhedron_t res
,
340 graphite_dim_t offset
,
341 bool direction
, graphite_dim_t i
)
343 ppl_Pointset_Powerset_C_Polyhedron_t ineq
;
346 ineq
= build_pairwise_scheduling_inequality (dim
, i
, offset
,
348 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (ineq
, res
);
349 empty_p
= ppl_Pointset_Powerset_C_Polyhedron_is_empty (ineq
);
351 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res
, ineq
);
352 ppl_delete_Pointset_Powerset_C_Polyhedron (ineq
);
357 /* Build the precedence constraints for the lexicographical comparison
358 of time vectors RES following the lexicographical order. */
361 build_lexicographically_gt_constraint (ppl_Pointset_Powerset_C_Polyhedron_t
*res
,
363 graphite_dim_t tdim1
,
364 graphite_dim_t offset
,
369 if (lexicographically_gt_p (*res
, dim
, offset
, direction
, 0))
372 for (i
= 0; i
< tdim1
- 1; i
++)
374 ppl_Pointset_Powerset_C_Polyhedron_t sceq
;
376 sceq
= build_pairwise_scheduling_equality (dim
, i
, offset
);
377 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (*res
, sceq
);
378 ppl_delete_Pointset_Powerset_C_Polyhedron (sceq
);
380 if (lexicographically_gt_p (*res
, dim
, offset
, direction
, i
+ 1))
386 ppl_delete_Pointset_Powerset_C_Polyhedron (*res
);
387 ppl_new_Pointset_Powerset_C_Polyhedron_from_space_dimension (res
, dim
, 1);
391 /* Build the dependence polyhedron for data references PDR1 and PDR2. */
394 dependence_polyhedron_1 (poly_bb_p pbb1
, poly_bb_p pbb2
,
395 ppl_Pointset_Powerset_C_Polyhedron_t d1
,
396 ppl_Pointset_Powerset_C_Polyhedron_t d2
,
397 poly_dr_p pdr1
, poly_dr_p pdr2
,
398 ppl_Polyhedron_t s1
, ppl_Polyhedron_t s2
,
400 bool original_scattering_p
)
402 scop_p scop
= PBB_SCOP (pbb1
);
403 graphite_dim_t tdim1
= original_scattering_p
?
404 pbb_nb_scattering_orig (pbb1
) : pbb_nb_scattering_transform (pbb1
);
405 graphite_dim_t tdim2
= original_scattering_p
?
406 pbb_nb_scattering_orig (pbb2
) : pbb_nb_scattering_transform (pbb2
);
407 graphite_dim_t ddim1
= pbb_dim_iter_domain (pbb1
);
408 graphite_dim_t ddim2
= pbb_dim_iter_domain (pbb2
);
409 graphite_dim_t sdim1
= PDR_NB_SUBSCRIPTS (pdr1
) + 1;
410 graphite_dim_t gdim
= scop_nb_params (scop
);
411 graphite_dim_t dim1
= pdr_dim (pdr1
);
412 graphite_dim_t dim2
= pdr_dim (pdr2
);
413 graphite_dim_t dim
= tdim1
+ tdim2
+ dim1
+ dim2
;
414 ppl_Pointset_Powerset_C_Polyhedron_t res
;
415 ppl_Pointset_Powerset_C_Polyhedron_t id1
, id2
, isc1
, isc2
, idr1
, idr2
;
416 ppl_Pointset_Powerset_C_Polyhedron_t sc1
, sc2
, dreq
;
418 gcc_assert (PBB_SCOP (pbb1
) == PBB_SCOP (pbb2
));
419 ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron (&sc1
, s1
);
420 ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron (&sc2
, s2
);
422 id1
= map_into_dep_poly (dim
, gdim
, d1
, ddim1
, tdim1
);
423 id2
= map_into_dep_poly (dim
, gdim
, d2
, ddim2
, tdim1
+ ddim1
+ tdim2
);
424 isc1
= map_into_dep_poly (dim
, gdim
, sc1
, ddim1
+ tdim1
, 0);
425 isc2
= map_into_dep_poly (dim
, gdim
, sc2
, ddim2
+ tdim2
, tdim1
+ ddim1
);
427 idr1
= map_dr_into_dep_poly (dim
, PDR_ACCESSES (pdr1
), ddim1
, ddim1
+ gdim
,
428 tdim1
, tdim2
+ ddim2
);
429 idr2
= map_dr_into_dep_poly (dim
, PDR_ACCESSES (pdr2
), ddim2
, ddim2
+ gdim
,
430 tdim1
+ ddim1
+ tdim2
, sdim1
);
432 /* Now add the subscript equalities. */
433 dreq
= dr_equality_constraints (dim
, tdim1
+ ddim1
+ tdim2
+ ddim2
, sdim1
);
435 ppl_new_Pointset_Powerset_C_Polyhedron_from_space_dimension (&res
, dim
, 0);
436 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res
, id1
);
437 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res
, id2
);
438 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res
, isc1
);
439 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res
, isc2
);
440 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res
, idr1
);
441 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res
, idr2
);
442 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res
, dreq
);
443 ppl_delete_Pointset_Powerset_C_Polyhedron (id1
);
444 ppl_delete_Pointset_Powerset_C_Polyhedron (id2
);
445 ppl_delete_Pointset_Powerset_C_Polyhedron (sc1
);
446 ppl_delete_Pointset_Powerset_C_Polyhedron (sc2
);
447 ppl_delete_Pointset_Powerset_C_Polyhedron (isc1
);
448 ppl_delete_Pointset_Powerset_C_Polyhedron (isc2
);
449 ppl_delete_Pointset_Powerset_C_Polyhedron (idr1
);
450 ppl_delete_Pointset_Powerset_C_Polyhedron (idr2
);
451 ppl_delete_Pointset_Powerset_C_Polyhedron (dreq
);
453 if (!ppl_Pointset_Powerset_C_Polyhedron_is_empty (res
))
454 build_lexicographically_gt_constraint (&res
, dim
, MIN (tdim1
, tdim2
),
455 tdim1
+ ddim1
, direction
);
457 return new_poly_ddr (pdr1
, pdr2
, res
);
460 /* Build the dependence polyhedron for data references PDR1 and PDR2.
461 If possible use already cached information. */
464 dependence_polyhedron (poly_bb_p pbb1
, poly_bb_p pbb2
,
465 ppl_Pointset_Powerset_C_Polyhedron_t d1
,
466 ppl_Pointset_Powerset_C_Polyhedron_t d2
,
467 poly_dr_p pdr1
, poly_dr_p pdr2
,
468 ppl_Polyhedron_t s1
, ppl_Polyhedron_t s2
,
470 bool original_scattering_p
)
475 if (original_scattering_p
)
481 x
= htab_find_slot (SCOP_ORIGINAL_PDDRS (PBB_SCOP (pbb1
)),
485 return (poly_ddr_p
) *x
;
488 res
= dependence_polyhedron_1 (pbb1
, pbb2
, d1
, d2
, pdr1
, pdr2
,
489 s1
, s2
, direction
, original_scattering_p
);
491 if (original_scattering_p
)
497 /* Returns the PDDR corresponding to the original schedule, or NULL if
498 the dependence relation is empty. */
501 pddr_original_scattering (poly_bb_p pbb1
, poly_bb_p pbb2
,
502 poly_dr_p pdr1
, poly_dr_p pdr2
)
505 ppl_Pointset_Powerset_C_Polyhedron_t d1
= PBB_DOMAIN (pbb1
);
506 ppl_Pointset_Powerset_C_Polyhedron_t d2
= PBB_DOMAIN (pbb2
);
507 ppl_Polyhedron_t so1
= PBB_ORIGINAL_SCATTERING (pbb1
);
508 ppl_Polyhedron_t so2
= PBB_ORIGINAL_SCATTERING (pbb2
);
510 if (PDR_NB_SUBSCRIPTS (pdr1
) != PDR_NB_SUBSCRIPTS (pdr2
))
513 pddr
= dependence_polyhedron (pbb1
, pbb2
, d1
, d2
, pdr1
, pdr2
, so1
, so2
,
515 if (pddr_is_empty (pddr
))
521 /* Returns true when the PBB_TRANSFORMED_SCATTERING functions of PBB1
522 and PBB2 respect the data dependences of PBB_ORIGINAL_SCATTERING
526 graphite_legal_transform_dr (poly_bb_p pbb1
, poly_bb_p pbb2
,
527 poly_dr_p pdr1
, poly_dr_p pdr2
)
529 ppl_Polyhedron_t st1
, st2
;
530 ppl_Pointset_Powerset_C_Polyhedron_t po
, pt
;
531 graphite_dim_t ddim1
, otdim1
, otdim2
, ttdim1
, ttdim2
;
532 ppl_Pointset_Powerset_C_Polyhedron_t temp
;
533 ppl_dimension_type pdim
;
536 ppl_Pointset_Powerset_C_Polyhedron_t d1
= PBB_DOMAIN (pbb1
);
537 ppl_Pointset_Powerset_C_Polyhedron_t d2
= PBB_DOMAIN (pbb2
);
539 pddr
= pddr_original_scattering (pbb1
, pbb2
, pdr1
, pdr2
);
543 po
= PDDR_DDP (pddr
);
545 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
546 fprintf (dump_file
, "\nloop carries dependency.\n");
548 st1
= PBB_TRANSFORMED_SCATTERING (pbb1
);
549 st2
= PBB_TRANSFORMED_SCATTERING (pbb2
);
550 ddim1
= pbb_dim_iter_domain (pbb1
);
551 otdim1
= pbb_nb_scattering_orig (pbb1
);
552 otdim2
= pbb_nb_scattering_orig (pbb2
);
553 ttdim1
= pbb_nb_scattering_transform (pbb1
);
554 ttdim2
= pbb_nb_scattering_transform (pbb2
);
556 /* Copy the PO polyhedron into the TEMP, so it is not destroyed.
557 Keep in mind, that PO polyhedron might be restored from the cache
558 and should not be modified! */
559 ppl_Pointset_Powerset_C_Polyhedron_space_dimension (po
, &pdim
);
560 ppl_new_Pointset_Powerset_C_Polyhedron_from_space_dimension (&temp
, pdim
, 0);
561 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (temp
, po
);
563 pddr
= dependence_polyhedron (pbb1
, pbb2
, d1
, d2
, pdr1
, pdr2
, st1
, st2
,
565 pt
= PDDR_DDP (pddr
);
567 /* Extend PO and PT to have the same dimensions. */
568 ppl_insert_dimensions_pointset (temp
, otdim1
, ttdim1
);
569 ppl_insert_dimensions_pointset (temp
, otdim1
+ ttdim1
+ ddim1
+ otdim2
, ttdim2
);
570 ppl_insert_dimensions_pointset (pt
, 0, otdim1
);
571 ppl_insert_dimensions_pointset (pt
, otdim1
+ ttdim1
+ ddim1
, otdim2
);
573 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (temp
, pt
);
574 is_empty_p
= ppl_Pointset_Powerset_C_Polyhedron_is_empty (temp
);
576 ppl_delete_Pointset_Powerset_C_Polyhedron (temp
);
577 free_poly_ddr (pddr
);
582 /* Iterates over the data references of PBB1 and PBB2 and detect
583 whether the transformed schedule is correct. */
586 graphite_legal_transform_bb (poly_bb_p pbb1
, poly_bb_p pbb2
)
589 poly_dr_p pdr1
, pdr2
;
591 for (i
= 0; VEC_iterate (poly_dr_p
, PBB_DRS (pbb1
), i
, pdr1
); i
++)
592 for (j
= 0; VEC_iterate (poly_dr_p
, PBB_DRS (pbb2
), j
, pdr2
); j
++)
593 if (!graphite_legal_transform_dr (pbb1
, pbb2
, pdr1
, pdr2
))
599 /* Iterates over the SCOP and detect whether the transformed schedule
603 graphite_legal_transform (scop_p scop
)
606 poly_bb_p pbb1
, pbb2
;
608 timevar_push (TV_GRAPHITE_DATA_DEPS
);
610 for (i
= 0; VEC_iterate (poly_bb_p
, SCOP_BBS (scop
), i
, pbb1
); i
++)
611 for (j
= 0; VEC_iterate (poly_bb_p
, SCOP_BBS (scop
), j
, pbb2
); j
++)
612 if (!graphite_legal_transform_bb (pbb1
, pbb2
))
614 timevar_pop (TV_GRAPHITE_DATA_DEPS
);
618 timevar_pop (TV_GRAPHITE_DATA_DEPS
);
622 /* Remove all the dimensions except alias information at dimension
626 build_alias_set_powerset (ppl_Pointset_Powerset_C_Polyhedron_t alias_powerset
,
627 ppl_dimension_type alias_dim
)
629 ppl_dimension_type
*ds
;
630 ppl_dimension_type access_dim
;
633 ppl_Pointset_Powerset_C_Polyhedron_space_dimension (alias_powerset
,
635 ds
= XNEWVEC (ppl_dimension_type
, access_dim
-1);
636 for (i
= 0; i
< access_dim
; i
++)
645 ppl_Pointset_Powerset_C_Polyhedron_remove_space_dimensions (alias_powerset
,
651 /* Return true when PDR1 and PDR2 may alias. */
654 poly_drs_may_alias_p (poly_dr_p pdr1
, poly_dr_p pdr2
)
656 ppl_Pointset_Powerset_C_Polyhedron_t alias_powerset1
, alias_powerset2
;
657 ppl_Pointset_Powerset_C_Polyhedron_t accesses1
= PDR_ACCESSES (pdr1
);
658 ppl_Pointset_Powerset_C_Polyhedron_t accesses2
= PDR_ACCESSES (pdr2
);
659 ppl_dimension_type alias_dim1
= pdr_alias_set_dim (pdr1
);
660 ppl_dimension_type alias_dim2
= pdr_alias_set_dim (pdr2
);
663 ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
664 (&alias_powerset1
, accesses1
);
665 ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
666 (&alias_powerset2
, accesses2
);
668 build_alias_set_powerset (alias_powerset1
, alias_dim1
);
669 build_alias_set_powerset (alias_powerset2
, alias_dim2
);
671 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign
672 (alias_powerset1
, alias_powerset2
);
674 empty_p
= ppl_Pointset_Powerset_C_Polyhedron_is_empty (alias_powerset1
);
676 ppl_delete_Pointset_Powerset_C_Polyhedron (alias_powerset1
);
677 ppl_delete_Pointset_Powerset_C_Polyhedron (alias_powerset2
);
682 /* Returns TRUE when the dependence polyhedron between PDR1 and
683 PDR2 represents a loop carried dependence at level LEVEL. */
686 graphite_carried_dependence_level_k (poly_dr_p pdr1
, poly_dr_p pdr2
,
689 poly_bb_p pbb1
= PDR_PBB (pdr1
);
690 poly_bb_p pbb2
= PDR_PBB (pdr2
);
691 ppl_Pointset_Powerset_C_Polyhedron_t d1
= PBB_DOMAIN (pbb1
);
692 ppl_Pointset_Powerset_C_Polyhedron_t d2
= PBB_DOMAIN (pbb2
);
693 ppl_Polyhedron_t so1
= PBB_TRANSFORMED_SCATTERING (pbb1
);
694 ppl_Polyhedron_t so2
= PBB_TRANSFORMED_SCATTERING (pbb2
);
695 ppl_Pointset_Powerset_C_Polyhedron_t po
;
696 ppl_Pointset_Powerset_C_Polyhedron_t eqpp
;
697 graphite_dim_t tdim1
= pbb_nb_scattering_transform (pbb1
);
698 graphite_dim_t ddim1
= pbb_dim_iter_domain (pbb1
);
699 ppl_dimension_type dim
;
703 if ((PDR_TYPE (pdr1
) == PDR_READ
&& PDR_TYPE (pdr2
) == PDR_READ
)
704 || !poly_drs_may_alias_p (pdr1
, pdr2
))
707 if (PDR_NB_SUBSCRIPTS (pdr1
) != PDR_NB_SUBSCRIPTS (pdr2
))
710 pddr
= dependence_polyhedron (pbb1
, pbb2
, d1
, d2
, pdr1
, pdr2
, so1
, so2
,
713 if (pddr_is_empty (pddr
))
716 po
= PDDR_DDP (pddr
);
717 ppl_Pointset_Powerset_C_Polyhedron_space_dimension (po
, &dim
);
718 eqpp
= build_pairwise_scheduling_inequality (dim
, level
, tdim1
+ ddim1
, 1);
720 ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (eqpp
, po
);
721 empty_p
= ppl_Pointset_Powerset_C_Polyhedron_is_empty (eqpp
);
723 ppl_delete_Pointset_Powerset_C_Polyhedron (eqpp
);
727 /* Check data dependency between PBB1 and PBB2 at level LEVEL. */
730 dependency_between_pbbs_p (poly_bb_p pbb1
, poly_bb_p pbb2
, int level
)
733 poly_dr_p pdr1
, pdr2
;
735 timevar_push (TV_GRAPHITE_DATA_DEPS
);
737 for (i
= 0; VEC_iterate (poly_dr_p
, PBB_DRS (pbb1
), i
, pdr1
); i
++)
738 for (j
= 0; VEC_iterate (poly_dr_p
, PBB_DRS (pbb2
), j
, pdr2
); j
++)
739 if (graphite_carried_dependence_level_k (pdr1
, pdr2
, level
))
741 timevar_pop (TV_GRAPHITE_DATA_DEPS
);
745 timevar_pop (TV_GRAPHITE_DATA_DEPS
);
749 /* Pretty print to FILE all the data dependences of SCoP in DOT
753 dot_deps_1 (FILE *file
, scop_p scop
)
756 poly_bb_p pbb1
, pbb2
;
757 poly_dr_p pdr1
, pdr2
;
759 fputs ("digraph all {\n", file
);
761 for (i
= 0; VEC_iterate (poly_bb_p
, SCOP_BBS (scop
), i
, pbb1
); i
++)
762 for (j
= 0; VEC_iterate (poly_bb_p
, SCOP_BBS (scop
), j
, pbb2
); j
++)
763 for (k
= 0; VEC_iterate (poly_dr_p
, PBB_DRS (pbb1
), k
, pdr1
); k
++)
764 for (l
= 0; VEC_iterate (poly_dr_p
, PBB_DRS (pbb2
), l
, pdr2
); l
++)
765 if (pddr_original_scattering (pbb1
, pbb2
, pdr1
, pdr2
))
766 fprintf (file
, "S%d_D%d -> S%d_D%d\n",
767 pbb_index (pbb1
), PDR_ID (pdr1
),
768 pbb_index (pbb2
), PDR_ID (pdr2
));
770 fputs ("}\n\n", file
);
773 /* Display all the data dependences in SCoP using dotty. */
776 dot_deps (scop_p scop
)
778 /* When debugging, enable the following code. This cannot be used
779 in production compilers because it calls "system". */
782 FILE *stream
= fopen ("/tmp/scopdeps.dot", "w");
785 dot_deps_1 (stream
, scop
);
788 x
= system ("dotty /tmp/scopdeps.dot");
790 dot_deps_1 (stderr
, scop
);