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
);
278 PDR_ACCESSES (pdr
) = accesses
;
279 PDR_TYPE (pdr
) = type
;
281 PDR_NB_SUBSCRIPTS (pdr
) = nb_subscripts
;
282 VEC_safe_push (poly_dr_p
, heap
, PBB_DRS (pbb
), pdr
);
285 /* Free polyhedral data reference PDR. */
288 free_poly_dr (poly_dr_p pdr
)
290 ppl_delete_Pointset_Powerset_C_Polyhedron (PDR_ACCESSES (pdr
));
294 /* Create a new polyhedral black box. */
297 new_poly_bb (scop_p scop
, void *black_box
)
299 poly_bb_p pbb
= XNEW (struct poly_bb
);
301 PBB_DOMAIN (pbb
) = NULL
;
302 PBB_SCOP (pbb
) = scop
;
303 pbb_set_black_box (pbb
, black_box
);
304 PBB_TRANSFORMED (pbb
) = NULL
;
305 PBB_SAVED (pbb
) = NULL
;
306 PBB_ORIGINAL (pbb
) = NULL
;
307 PBB_DRS (pbb
) = VEC_alloc (poly_dr_p
, heap
, 3);
308 VEC_safe_push (poly_bb_p
, heap
, SCOP_BBS (scop
), pbb
);
311 /* Free polyhedral black box. */
314 free_poly_bb (poly_bb_p pbb
)
319 ppl_delete_Pointset_Powerset_C_Polyhedron (PBB_DOMAIN (pbb
));
321 if (PBB_TRANSFORMED (pbb
))
322 poly_scattering_free (PBB_TRANSFORMED (pbb
));
325 poly_scattering_free (PBB_SAVED (pbb
));
327 if (PBB_ORIGINAL (pbb
))
328 poly_scattering_free (PBB_ORIGINAL (pbb
));
331 for (i
= 0; VEC_iterate (poly_dr_p
, PBB_DRS (pbb
), i
, pdr
); i
++)
334 VEC_free (poly_dr_p
, heap
, PBB_DRS (pbb
));
339 print_pdr_access_layout (FILE *file
, poly_dr_p pdr
)
343 fprintf (file
, "# eq");
345 for (i
= 0; i
< pdr_dim_iter_domain (pdr
); i
++)
346 fprintf (file
, " i%d", (int) i
);
348 for (i
= 0; i
< pdr_nb_params (pdr
); i
++)
349 fprintf (file
, " p%d", (int) i
);
351 fprintf (file
, " alias");
353 for (i
= 0; i
< PDR_NB_SUBSCRIPTS (pdr
); i
++)
354 fprintf (file
, " sub%d", (int) i
);
356 fprintf (file
, " cst\n");
359 /* Prints to FILE the polyhedral data reference PDR. */
362 print_pdr (FILE *file
, poly_dr_p pdr
)
364 fprintf (file
, "pdr (");
366 switch (PDR_TYPE (pdr
))
369 fprintf (file
, "read \n");
373 fprintf (file
, "write \n");
377 fprintf (file
, "may_write \n");
384 dump_data_reference (file
, (data_reference_p
) PDR_CDR (pdr
));
386 fprintf (file
, "data accesses (\n");
387 print_pdr_access_layout (file
, pdr
);
388 ppl_print_powerset_matrix (file
, PDR_ACCESSES (pdr
));
389 fprintf (file
, ")\n");
391 fprintf (file
, ")\n");
394 /* Prints to STDERR the polyhedral data reference PDR. */
397 debug_pdr (poly_dr_p pdr
)
399 print_pdr (stderr
, pdr
);
402 /* Creates a new SCOP containing REGION. */
405 new_scop (void *region
)
407 scop_p scop
= XNEW (struct scop
);
409 SCOP_DEP_GRAPH (scop
) = NULL
;
410 SCOP_CONTEXT (scop
) = NULL
;
411 scop_set_region (scop
, region
);
412 SCOP_BBS (scop
) = VEC_alloc (poly_bb_p
, heap
, 3);
413 SCOP_ORIGINAL_PDR_PAIRS (scop
) = htab_create (10, hash_poly_dr_pair_p
,
414 eq_poly_dr_pair_p
, free
);
421 free_scop (scop_p scop
)
426 for (i
= 0; VEC_iterate (poly_bb_p
, SCOP_BBS (scop
), i
, pbb
); i
++)
429 VEC_free (poly_bb_p
, heap
, SCOP_BBS (scop
));
431 if (SCOP_CONTEXT (scop
))
432 ppl_delete_Pointset_Powerset_C_Polyhedron (SCOP_CONTEXT (scop
));
434 htab_delete (SCOP_ORIGINAL_PDR_PAIRS (scop
));
438 /* Print to FILE the domain of PBB. */
441 print_pbb_domain (FILE *file
, poly_bb_p pbb
)
444 gimple_bb_p gbb
= PBB_BLACK_BOX (pbb
);
446 if (!PBB_DOMAIN (pbb
))
449 fprintf (file
, "domains bb_%d (\n", GBB_BB (gbb
)->index
);
450 fprintf (file
, "# eq");
452 for (i
= 0; i
< pbb_dim_iter_domain (pbb
); i
++)
453 fprintf (file
, " i%d", (int) i
);
455 for (i
= 0; i
< pbb_nb_params (pbb
); i
++)
456 fprintf (file
, " p%d", (int) i
);
458 fprintf (file
, " cst\n");
460 if (PBB_DOMAIN (pbb
))
461 ppl_print_powerset_matrix (file
, PBB_DOMAIN (pbb
));
463 fprintf (file
, ")\n");
466 /* Dump the cases of a graphite basic block GBB on FILE. */
469 dump_gbb_cases (FILE *file
, gimple_bb_p gbb
)
473 VEC (gimple
, heap
) *cases
;
478 cases
= GBB_CONDITION_CASES (gbb
);
479 if (VEC_empty (gimple
, cases
))
482 fprintf (file
, "cases bb_%d (", GBB_BB (gbb
)->index
);
484 for (i
= 0; VEC_iterate (gimple
, cases
, i
, stmt
); i
++)
485 print_gimple_stmt (file
, stmt
, 0, 0);
487 fprintf (file
, ")\n");
490 /* Dump conditions of a graphite basic block GBB on FILE. */
493 dump_gbb_conditions (FILE *file
, gimple_bb_p gbb
)
497 VEC (gimple
, heap
) *conditions
;
502 conditions
= GBB_CONDITIONS (gbb
);
503 if (VEC_empty (gimple
, conditions
))
506 fprintf (file
, "conditions bb_%d (", GBB_BB (gbb
)->index
);
508 for (i
= 0; VEC_iterate (gimple
, conditions
, i
, stmt
); i
++)
509 print_gimple_stmt (file
, stmt
, 0, 0);
511 fprintf (file
, ")\n");
514 /* Print to FILE all the data references of PBB. */
517 print_pdrs (FILE *file
, poly_bb_p pbb
)
522 for (i
= 0; VEC_iterate (poly_dr_p
, PBB_DRS (pbb
), i
, pdr
); i
++)
523 print_pdr (file
, pdr
);
526 /* Print to STDERR all the data references of PBB. */
529 debug_pdrs (poly_bb_p pbb
)
531 print_pdrs (stderr
, pbb
);
534 /* Print to FILE the domain and scattering function of PBB. */
537 print_pbb (FILE *file
, poly_bb_p pbb
)
539 fprintf (file
, "pbb (\n");
540 dump_gbb_conditions (file
, PBB_BLACK_BOX (pbb
));
541 dump_gbb_cases (file
, PBB_BLACK_BOX (pbb
));
542 print_pdrs (file
, pbb
);
543 print_pbb_domain (file
, pbb
);
544 print_scattering_function (file
, pbb
);
545 fprintf (file
, ")\n");
548 /* Print to FILE the parameters of SCOP. */
551 print_scop_params (FILE *file
, scop_p scop
)
556 fprintf (file
, "parameters (\n");
557 for (i
= 0; VEC_iterate (tree
, SESE_PARAMS (SCOP_REGION (scop
)), i
, t
); i
++)
559 fprintf (file
, "p_%d -> ", i
);
560 print_generic_expr (file
, t
, 0);
561 fprintf (file
, "\n");
563 fprintf (file
, ")\n");
566 /* Print to FILE the context of SCoP. */
568 print_scop_context (FILE *file
, scop_p scop
)
572 fprintf (file
, "context (\n");
573 fprintf (file
, "# eq");
575 for (i
= 0; i
< scop_nb_params (scop
); i
++)
576 fprintf (file
, " p%d", (int) i
);
578 fprintf (file
, " cst\n");
580 if (SCOP_CONTEXT (scop
))
581 ppl_print_powerset_matrix (file
, SCOP_CONTEXT (scop
));
583 fprintf (file
, ")\n");
586 /* Print to FILE the SCOP. */
589 print_scop (FILE *file
, scop_p scop
)
594 fprintf (file
, "scop (\n");
595 print_scop_params (file
, scop
);
596 print_scop_context (file
, scop
);
598 for (i
= 0; VEC_iterate (poly_bb_p
, SCOP_BBS (scop
), i
, pbb
); i
++)
599 print_pbb (file
, pbb
);
601 fprintf (file
, ")\n");
604 /* Print to STDERR the domain of PBB. */
607 debug_pbb_domain (poly_bb_p pbb
)
609 print_pbb_domain (stderr
, pbb
);
612 /* Print to FILE the domain and scattering function of PBB. */
615 debug_pbb (poly_bb_p pbb
)
617 print_pbb (stderr
, pbb
);
620 /* Print to STDERR the context of SCOP. */
623 debug_scop_context (scop_p scop
)
625 print_scop_context (stderr
, scop
);
628 /* Print to STDERR the SCOP. */
631 debug_scop (scop_p scop
)
633 print_scop (stderr
, scop
);
636 /* Print to STDERR the parameters of SCOP. */
639 debug_scop_params (scop_p scop
)
641 print_scop_params (stderr
, scop
);
645 /* The dimension in the transformed scattering polyhedron of PBB
646 containing the scattering iterator for the loop at depth LOOP_DEPTH. */
649 psct_scattering_dim_for_loop_depth (poly_bb_p pbb
, graphite_dim_t loop_depth
)
651 ppl_const_Constraint_System_t pcs
;
652 ppl_Constraint_System_const_iterator_t cit
, cend
;
653 ppl_const_Constraint_t cstr
;
654 ppl_Polyhedron_t ph
= PBB_TRANSFORMED_SCATTERING (pbb
);
655 ppl_dimension_type iter
= psct_iterator_dim (pbb
, loop_depth
);
656 ppl_Linear_Expression_t expr
;
657 ppl_Coefficient_t coef
;
662 ppl_new_Coefficient (&coef
);
663 ppl_Polyhedron_get_constraints (ph
, &pcs
);
664 ppl_new_Constraint_System_const_iterator (&cit
);
665 ppl_new_Constraint_System_const_iterator (&cend
);
667 for (ppl_Constraint_System_begin (pcs
, cit
),
668 ppl_Constraint_System_end (pcs
, cend
);
669 !ppl_Constraint_System_const_iterator_equal_test (cit
, cend
);
670 ppl_Constraint_System_const_iterator_increment (cit
))
672 ppl_Constraint_System_const_iterator_dereference (cit
, &cstr
);
673 ppl_new_Linear_Expression_from_Constraint (&expr
, cstr
);
674 ppl_Linear_Expression_coefficient (expr
, iter
, coef
);
675 ppl_Coefficient_to_mpz_t (coef
, val
);
677 if (value_zero_p (val
))
679 ppl_delete_Linear_Expression (expr
);
683 for (i
= 0; i
< pbb_nb_scattering_transform (pbb
); i
++)
685 ppl_dimension_type scatter
= psct_scattering_dim (pbb
, i
);
687 ppl_Linear_Expression_coefficient (expr
, scatter
, coef
);
688 ppl_Coefficient_to_mpz_t (coef
, val
);
690 if (value_notzero_p (val
))
693 ppl_delete_Linear_Expression (expr
);
694 ppl_delete_Coefficient (coef
);
695 ppl_delete_Constraint_System_const_iterator (cit
);
696 ppl_delete_Constraint_System_const_iterator (cend
);
706 /* Returns the number of iterations NITER of the loop around PBB at
710 pbb_number_of_iterations (poly_bb_p pbb
,
711 graphite_dim_t loop_depth
,
714 ppl_Linear_Expression_t le
;
715 ppl_dimension_type dim
;
717 ppl_Pointset_Powerset_C_Polyhedron_space_dimension (PBB_DOMAIN (pbb
), &dim
);
718 ppl_new_Linear_Expression_with_dimension (&le
, dim
);
719 ppl_set_coef (le
, pbb_iterator_dim (pbb
, loop_depth
), 1);
720 value_set_si (niter
, -1);
721 ppl_max_for_le (PBB_DOMAIN (pbb
), le
, niter
);
722 ppl_delete_Linear_Expression (le
);