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>.
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/>. */
23 #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 "value-prof.h"
42 #include "pointer-set.h"
47 #include "cloog/cloog.h"
50 #include "graphite-ppl.h"
52 #include "graphite-poly.h"
53 #include "graphite-dependences.h"
55 /* Return the maximal loop depth in SCOP. */
58 scop_max_loop_depth (scop_p scop
)
64 for (i
= 0; VEC_iterate (poly_bb_p
, SCOP_BBS (scop
), i
, pbb
); i
++)
66 int nb_loops
= pbb_dim_iter_domain (pbb
);
67 if (max_nb_loops
< nb_loops
)
68 max_nb_loops
= nb_loops
;
74 /* Extend the scattering matrix of PBB to MAX_SCATTERING scattering
78 extend_scattering (poly_bb_p pbb
, int max_scattering
)
80 ppl_dimension_type nb_old_dims
, nb_new_dims
;
82 ppl_Coefficient_t coef
;
85 nb_added_dims
= max_scattering
- pbb_nb_scattering_transform (pbb
);
87 value_set_si (one
, 1);
88 ppl_new_Coefficient (&coef
);
89 ppl_assign_Coefficient_from_mpz_t (coef
, one
);
91 gcc_assert (nb_added_dims
>= 0);
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
;
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
;
101 /* Add identity matrix for the added dimensions. */
102 for (i
= max_scattering
- nb_added_dims
; i
< max_scattering
; i
++)
104 ppl_Constraint_t cstr
;
105 ppl_Linear_Expression_t expr
;
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
);
115 ppl_delete_Coefficient (coef
);
119 /* All scattering matrices in SCOP will have the same number of scattering
123 unify_scattering_dimensions (scop_p scop
)
127 graphite_dim_t max_scattering
= 0;
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
);
132 for (i
= 0; VEC_iterate (poly_bb_p
, SCOP_BBS (scop
), i
, pbb
); i
++)
133 extend_scattering (pbb
, max_scattering
);
135 return max_scattering
;
138 /* Prints to FILE the scattering function of PBB. */
141 print_scattering_function (FILE *file
, poly_bb_p pbb
)
145 if (!PBB_TRANSFORMED (pbb
))
148 fprintf (file
, "scattering bb_%d (\n", GBB_BB (PBB_BLACK_BOX (pbb
))->index
);
149 fprintf (file
, "# eq");
151 for (i
= 0; i
< pbb_nb_scattering_transform (pbb
); i
++)
152 fprintf (file
, " s%d", (int) i
);
154 for (i
= 0; i
< pbb_nb_local_vars (pbb
); i
++)
155 fprintf (file
, " lv%d", (int) i
);
157 for (i
= 0; i
< pbb_dim_iter_domain (pbb
); i
++)
158 fprintf (file
, " i%d", (int) i
);
160 for (i
= 0; i
< pbb_nb_params (pbb
); i
++)
161 fprintf (file
, " p%d", (int) i
);
163 fprintf (file
, " cst\n");
165 ppl_print_polyhedron_matrix (file
, PBB_TRANSFORMED_SCATTERING (pbb
));
167 fprintf (file
, ")\n");
170 /* Prints to FILE the iteration domain of PBB. */
173 print_iteration_domain (FILE *file
, poly_bb_p pbb
)
175 print_pbb_domain (file
, pbb
);
178 /* Prints to FILE the scattering functions of every PBB of SCOP. */
181 print_scattering_functions (FILE *file
, scop_p scop
)
186 for (i
= 0; VEC_iterate (poly_bb_p
, SCOP_BBS (scop
), i
, pbb
); i
++)
187 print_scattering_function (file
, pbb
);
190 /* Prints to FILE the iteration domains of every PBB of SCOP. */
193 print_iteration_domains (FILE *file
, scop_p scop
)
198 for (i
= 0; VEC_iterate (poly_bb_p
, SCOP_BBS (scop
), i
, pbb
); i
++)
199 print_iteration_domain (file
, pbb
);
202 /* Prints to STDERR the scattering function of PBB. */
205 debug_scattering_function (poly_bb_p pbb
)
207 print_scattering_function (stderr
, pbb
);
210 /* Prints to STDERR the iteration domain of PBB. */
213 debug_iteration_domain (poly_bb_p pbb
)
215 print_iteration_domain (stderr
, pbb
);
218 /* Prints to STDERR the scattering functions of every PBB of SCOP. */
221 debug_scattering_functions (scop_p scop
)
223 print_scattering_functions (stderr
, scop
);
226 /* Prints to STDERR the iteration domains of every PBB of SCOP. */
229 debug_iteration_domains (scop_p scop
)
231 print_iteration_domains (stderr
, scop
);
234 /* Apply graphite transformations to all the basic blocks of SCOP. */
237 apply_poly_transforms (scop_p scop
)
239 bool transform_done
= false;
241 gcc_assert (graphite_legal_transform (scop
));
243 /* Generate code even if we did not apply any real transformation.
244 This also allows to check the performance for the identity
245 transformation: GIMPLE -> GRAPHITE -> GIMPLE
246 Keep in mind that CLooG optimizes in control, so the loop structure
247 may change, even if we only use -fgraphite-identity. */
248 if (flag_graphite_identity
)
249 transform_done
= true;
251 if (flag_loop_parallelize_all
)
252 transform_done
= true;
255 gcc_unreachable (); /* Not yet supported. */
257 if (flag_loop_strip_mine
)
258 transform_done
|= scop_do_strip_mine (scop
);
260 if (flag_loop_interchange
)
261 transform_done
|= scop_do_interchange (scop
);
263 return transform_done
;
266 /* Create a new polyhedral data reference and add it to PBB. It is
267 defined by its ACCESSES, its TYPE, and the number of subscripts
271 new_poly_dr (poly_bb_p pbb
,
272 ppl_Pointset_Powerset_C_Polyhedron_t accesses
,
273 enum POLY_DR_TYPE type
, void *cdr
, int nb_subscripts
)
275 poly_dr_p pdr
= XNEW (struct poly_dr
);
280 PDR_ACCESSES (pdr
) = accesses
;
281 PDR_TYPE (pdr
) = type
;
283 PDR_NB_SUBSCRIPTS (pdr
) = nb_subscripts
;
284 VEC_safe_push (poly_dr_p
, heap
, PBB_DRS (pbb
), pdr
);
287 /* Free polyhedral data reference PDR. */
290 free_poly_dr (poly_dr_p pdr
)
292 ppl_delete_Pointset_Powerset_C_Polyhedron (PDR_ACCESSES (pdr
));
296 /* Create a new polyhedral black box. */
299 new_poly_bb (scop_p scop
, void *black_box
)
301 poly_bb_p pbb
= XNEW (struct poly_bb
);
303 PBB_DOMAIN (pbb
) = NULL
;
304 PBB_SCOP (pbb
) = scop
;
305 pbb_set_black_box (pbb
, black_box
);
306 PBB_TRANSFORMED (pbb
) = NULL
;
307 PBB_SAVED (pbb
) = NULL
;
308 PBB_ORIGINAL (pbb
) = NULL
;
309 PBB_DRS (pbb
) = VEC_alloc (poly_dr_p
, heap
, 3);
310 VEC_safe_push (poly_bb_p
, heap
, SCOP_BBS (scop
), pbb
);
313 /* Free polyhedral black box. */
316 free_poly_bb (poly_bb_p pbb
)
321 ppl_delete_Pointset_Powerset_C_Polyhedron (PBB_DOMAIN (pbb
));
323 if (PBB_TRANSFORMED (pbb
))
324 poly_scattering_free (PBB_TRANSFORMED (pbb
));
327 poly_scattering_free (PBB_SAVED (pbb
));
329 if (PBB_ORIGINAL (pbb
))
330 poly_scattering_free (PBB_ORIGINAL (pbb
));
333 for (i
= 0; VEC_iterate (poly_dr_p
, PBB_DRS (pbb
), i
, pdr
); i
++)
336 VEC_free (poly_dr_p
, heap
, PBB_DRS (pbb
));
341 print_pdr_access_layout (FILE *file
, poly_dr_p pdr
)
345 fprintf (file
, "# eq");
347 for (i
= 0; i
< pdr_dim_iter_domain (pdr
); i
++)
348 fprintf (file
, " i%d", (int) i
);
350 for (i
= 0; i
< pdr_nb_params (pdr
); i
++)
351 fprintf (file
, " p%d", (int) i
);
353 fprintf (file
, " alias");
355 for (i
= 0; i
< PDR_NB_SUBSCRIPTS (pdr
); i
++)
356 fprintf (file
, " sub%d", (int) i
);
358 fprintf (file
, " cst\n");
361 /* Prints to FILE the polyhedral data reference PDR. */
364 print_pdr (FILE *file
, poly_dr_p pdr
)
366 fprintf (file
, "pdr_%d (", PDR_ID (pdr
));
368 switch (PDR_TYPE (pdr
))
371 fprintf (file
, "read \n");
375 fprintf (file
, "write \n");
379 fprintf (file
, "may_write \n");
386 dump_data_reference (file
, (data_reference_p
) PDR_CDR (pdr
));
388 fprintf (file
, "data accesses (\n");
389 print_pdr_access_layout (file
, pdr
);
390 ppl_print_powerset_matrix (file
, PDR_ACCESSES (pdr
));
391 fprintf (file
, ")\n");
393 fprintf (file
, ")\n");
396 /* Prints to STDERR the polyhedral data reference PDR. */
399 debug_pdr (poly_dr_p pdr
)
401 print_pdr (stderr
, pdr
);
404 /* Creates a new SCOP containing REGION. */
407 new_scop (void *region
)
409 scop_p scop
= XNEW (struct scop
);
411 SCOP_DEP_GRAPH (scop
) = NULL
;
412 SCOP_CONTEXT (scop
) = NULL
;
413 scop_set_region (scop
, region
);
414 SCOP_BBS (scop
) = VEC_alloc (poly_bb_p
, heap
, 3);
415 SCOP_ORIGINAL_PDDRS (scop
) = htab_create (10, hash_poly_ddr_p
,
416 eq_poly_ddr_p
, free_poly_ddr
);
423 free_scop (scop_p scop
)
428 for (i
= 0; VEC_iterate (poly_bb_p
, SCOP_BBS (scop
), i
, pbb
); i
++)
431 VEC_free (poly_bb_p
, heap
, SCOP_BBS (scop
));
433 if (SCOP_CONTEXT (scop
))
434 ppl_delete_Pointset_Powerset_C_Polyhedron (SCOP_CONTEXT (scop
));
436 htab_delete (SCOP_ORIGINAL_PDDRS (scop
));
440 /* Print to FILE the domain of PBB. */
443 print_pbb_domain (FILE *file
, poly_bb_p pbb
)
446 gimple_bb_p gbb
= PBB_BLACK_BOX (pbb
);
448 if (!PBB_DOMAIN (pbb
))
451 fprintf (file
, "domains bb_%d (\n", GBB_BB (gbb
)->index
);
452 fprintf (file
, "# eq");
454 for (i
= 0; i
< pbb_dim_iter_domain (pbb
); i
++)
455 fprintf (file
, " i%d", (int) i
);
457 for (i
= 0; i
< pbb_nb_params (pbb
); i
++)
458 fprintf (file
, " p%d", (int) i
);
460 fprintf (file
, " cst\n");
462 if (PBB_DOMAIN (pbb
))
463 ppl_print_powerset_matrix (file
, PBB_DOMAIN (pbb
));
465 fprintf (file
, ")\n");
468 /* Dump the cases of a graphite basic block GBB on FILE. */
471 dump_gbb_cases (FILE *file
, gimple_bb_p gbb
)
475 VEC (gimple
, heap
) *cases
;
480 cases
= GBB_CONDITION_CASES (gbb
);
481 if (VEC_empty (gimple
, cases
))
484 fprintf (file
, "cases bb_%d (", GBB_BB (gbb
)->index
);
486 for (i
= 0; VEC_iterate (gimple
, cases
, i
, stmt
); i
++)
487 print_gimple_stmt (file
, stmt
, 0, 0);
489 fprintf (file
, ")\n");
492 /* Dump conditions of a graphite basic block GBB on FILE. */
495 dump_gbb_conditions (FILE *file
, gimple_bb_p gbb
)
499 VEC (gimple
, heap
) *conditions
;
504 conditions
= GBB_CONDITIONS (gbb
);
505 if (VEC_empty (gimple
, conditions
))
508 fprintf (file
, "conditions bb_%d (", GBB_BB (gbb
)->index
);
510 for (i
= 0; VEC_iterate (gimple
, conditions
, i
, stmt
); i
++)
511 print_gimple_stmt (file
, stmt
, 0, 0);
513 fprintf (file
, ")\n");
516 /* Print to FILE all the data references of PBB. */
519 print_pdrs (FILE *file
, poly_bb_p pbb
)
524 for (i
= 0; VEC_iterate (poly_dr_p
, PBB_DRS (pbb
), i
, pdr
); i
++)
525 print_pdr (file
, pdr
);
528 /* Print to STDERR all the data references of PBB. */
531 debug_pdrs (poly_bb_p pbb
)
533 print_pdrs (stderr
, pbb
);
536 /* Print to FILE the domain and scattering function of PBB. */
539 print_pbb (FILE *file
, poly_bb_p pbb
)
541 fprintf (file
, "pbb_%d (\n", GBB_BB (PBB_BLACK_BOX (pbb
))->index
);
542 dump_gbb_conditions (file
, PBB_BLACK_BOX (pbb
));
543 dump_gbb_cases (file
, PBB_BLACK_BOX (pbb
));
544 print_pdrs (file
, pbb
);
545 print_pbb_domain (file
, pbb
);
546 print_scattering_function (file
, pbb
);
547 fprintf (file
, ")\n");
550 /* Print to FILE the parameters of SCOP. */
553 print_scop_params (FILE *file
, scop_p scop
)
558 fprintf (file
, "parameters (\n");
559 for (i
= 0; VEC_iterate (tree
, SESE_PARAMS (SCOP_REGION (scop
)), i
, t
); i
++)
561 fprintf (file
, "p_%d -> ", i
);
562 print_generic_expr (file
, t
, 0);
563 fprintf (file
, "\n");
565 fprintf (file
, ")\n");
568 /* Print to FILE the context of SCoP. */
570 print_scop_context (FILE *file
, scop_p scop
)
574 fprintf (file
, "context (\n");
575 fprintf (file
, "# eq");
577 for (i
= 0; i
< scop_nb_params (scop
); i
++)
578 fprintf (file
, " p%d", (int) i
);
580 fprintf (file
, " cst\n");
582 if (SCOP_CONTEXT (scop
))
583 ppl_print_powerset_matrix (file
, SCOP_CONTEXT (scop
));
585 fprintf (file
, ")\n");
588 /* Print to FILE the SCOP. */
591 print_scop (FILE *file
, scop_p scop
)
596 fprintf (file
, "scop (\n");
597 print_scop_params (file
, scop
);
598 print_scop_context (file
, scop
);
600 for (i
= 0; VEC_iterate (poly_bb_p
, SCOP_BBS (scop
), i
, pbb
); i
++)
601 print_pbb (file
, pbb
);
603 fprintf (file
, ")\n");
606 /* Print to STDERR the domain of PBB. */
609 debug_pbb_domain (poly_bb_p pbb
)
611 print_pbb_domain (stderr
, pbb
);
614 /* Print to FILE the domain and scattering function of PBB. */
617 debug_pbb (poly_bb_p pbb
)
619 print_pbb (stderr
, pbb
);
622 /* Print to STDERR the context of SCOP. */
625 debug_scop_context (scop_p scop
)
627 print_scop_context (stderr
, scop
);
630 /* Print to STDERR the SCOP. */
633 debug_scop (scop_p scop
)
635 print_scop (stderr
, scop
);
638 /* Print to STDERR the parameters of SCOP. */
641 debug_scop_params (scop_p scop
)
643 print_scop_params (stderr
, scop
);
647 /* The dimension in the transformed scattering polyhedron of PBB
648 containing the scattering iterator for the loop at depth LOOP_DEPTH. */
651 psct_scattering_dim_for_loop_depth (poly_bb_p pbb
, graphite_dim_t loop_depth
)
653 ppl_const_Constraint_System_t pcs
;
654 ppl_Constraint_System_const_iterator_t cit
, cend
;
655 ppl_const_Constraint_t cstr
;
656 ppl_Polyhedron_t ph
= PBB_TRANSFORMED_SCATTERING (pbb
);
657 ppl_dimension_type iter
= psct_iterator_dim (pbb
, loop_depth
);
658 ppl_Linear_Expression_t expr
;
659 ppl_Coefficient_t coef
;
664 ppl_new_Coefficient (&coef
);
665 ppl_Polyhedron_get_constraints (ph
, &pcs
);
666 ppl_new_Constraint_System_const_iterator (&cit
);
667 ppl_new_Constraint_System_const_iterator (&cend
);
669 for (ppl_Constraint_System_begin (pcs
, cit
),
670 ppl_Constraint_System_end (pcs
, cend
);
671 !ppl_Constraint_System_const_iterator_equal_test (cit
, cend
);
672 ppl_Constraint_System_const_iterator_increment (cit
))
674 ppl_Constraint_System_const_iterator_dereference (cit
, &cstr
);
675 ppl_new_Linear_Expression_from_Constraint (&expr
, cstr
);
676 ppl_Linear_Expression_coefficient (expr
, iter
, coef
);
677 ppl_Coefficient_to_mpz_t (coef
, val
);
679 if (value_zero_p (val
))
681 ppl_delete_Linear_Expression (expr
);
685 for (i
= 0; i
< pbb_nb_scattering_transform (pbb
); i
++)
687 ppl_dimension_type scatter
= psct_scattering_dim (pbb
, i
);
689 ppl_Linear_Expression_coefficient (expr
, scatter
, coef
);
690 ppl_Coefficient_to_mpz_t (coef
, val
);
692 if (value_notzero_p (val
))
695 ppl_delete_Linear_Expression (expr
);
696 ppl_delete_Coefficient (coef
);
697 ppl_delete_Constraint_System_const_iterator (cit
);
698 ppl_delete_Constraint_System_const_iterator (cend
);
708 /* Returns the number of iterations NITER of the loop around PBB at
712 pbb_number_of_iterations (poly_bb_p pbb
,
713 graphite_dim_t loop_depth
,
716 ppl_Linear_Expression_t le
;
717 ppl_dimension_type dim
;
719 ppl_Pointset_Powerset_C_Polyhedron_space_dimension (PBB_DOMAIN (pbb
), &dim
);
720 ppl_new_Linear_Expression_with_dimension (&le
, dim
);
721 ppl_set_coef (le
, pbb_iterator_dim (pbb
, loop_depth
), 1);
722 value_set_si (niter
, -1);
723 ppl_max_for_le (PBB_DOMAIN (pbb
), le
, niter
);
724 ppl_delete_Linear_Expression (le
);