1 /* Gimple Represented as Polyhedra.
2 Copyright (C) 2006-2015 Free Software Foundation, Inc.
3 Contributed by Sebastian Pop <sebastian.pop@inria.fr>.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
21 /* This pass converts GIMPLE to GRAPHITE, performs some loop
22 transformations and then converts the resulting representation back
25 An early description of this pass can be found in the GCC Summit'06
26 paper "GRAPHITE: Polyhedral Analyses and Optimizations for GCC".
27 The wiki page http://gcc.gnu.org/wiki/Graphite contains pointers to
30 One important document to read is CLooG's internal manual:
31 http://repo.or.cz/w/cloog-ppl.git?a=blob_plain;f=doc/cloog.texi;hb=HEAD
32 that describes the data structure of loops used in this file, and
33 the functions that are used for transforming the code. */
38 /* Workaround for GMP 5.1.3 bug, see PR56019. */
43 #include <isl/options.h>
44 #include <isl/union_map.h>
48 #include "coretypes.h"
50 #include "diagnostic-core.h"
52 #include "tree-pass.h"
59 #include "fold-const.h"
60 #include "gimple-iterator.h"
62 #include "tree-ssa-loop.h"
63 #include "tree-data-ref.h"
64 #include "tree-scalar-evolution.h"
65 #include "graphite-poly.h"
67 #include "tree-parloops.h"
68 #include "tree-cfgcleanup.h"
69 #include "graphite-scop-detection.h"
70 #include "graphite-isl-ast-to-gimple.h"
71 #include "graphite-sese-to-poly.h"
73 /* Print global statistics to FILE. */
76 print_global_statistics (FILE* file
)
81 long n_conditions
= 0;
85 long n_p_conditions
= 0;
89 FOR_ALL_BB_FN (bb
, cfun
)
91 gimple_stmt_iterator psi
;
96 /* Ignore artificial surrounding loop. */
97 if (bb
== bb
->loop_father
->header
101 n_p_loops
+= bb
->count
;
104 if (EDGE_COUNT (bb
->succs
) > 1)
107 n_p_conditions
+= bb
->count
;
110 for (psi
= gsi_start_bb (bb
); !gsi_end_p (psi
); gsi_next (&psi
))
113 n_p_stmts
+= bb
->count
;
117 fprintf (file
, "\nGlobal statistics (");
118 fprintf (file
, "BBS:%ld, ", n_bbs
);
119 fprintf (file
, "LOOPS:%ld, ", n_loops
);
120 fprintf (file
, "CONDITIONS:%ld, ", n_conditions
);
121 fprintf (file
, "STMTS:%ld)\n", n_stmts
);
122 fprintf (file
, "\nGlobal profiling statistics (");
123 fprintf (file
, "BBS:%ld, ", n_p_bbs
);
124 fprintf (file
, "LOOPS:%ld, ", n_p_loops
);
125 fprintf (file
, "CONDITIONS:%ld, ", n_p_conditions
);
126 fprintf (file
, "STMTS:%ld)\n", n_p_stmts
);
129 /* Print statistics for SCOP to FILE. */
132 print_graphite_scop_statistics (FILE* file
, scop_p scop
)
137 long n_conditions
= 0;
141 long n_p_conditions
= 0;
145 FOR_ALL_BB_FN (bb
, cfun
)
147 gimple_stmt_iterator psi
;
148 loop_p loop
= bb
->loop_father
;
150 if (!bb_in_sese_p (bb
, SCOP_REGION (scop
)))
154 n_p_bbs
+= bb
->count
;
156 if (EDGE_COUNT (bb
->succs
) > 1)
159 n_p_conditions
+= bb
->count
;
162 for (psi
= gsi_start_bb (bb
); !gsi_end_p (psi
); gsi_next (&psi
))
165 n_p_stmts
+= bb
->count
;
168 if (loop
->header
== bb
&& loop_in_sese_p (loop
, SCOP_REGION (scop
)))
171 n_p_loops
+= bb
->count
;
175 fprintf (file
, "\nSCoP statistics (");
176 fprintf (file
, "BBS:%ld, ", n_bbs
);
177 fprintf (file
, "LOOPS:%ld, ", n_loops
);
178 fprintf (file
, "CONDITIONS:%ld, ", n_conditions
);
179 fprintf (file
, "STMTS:%ld)\n", n_stmts
);
180 fprintf (file
, "\nSCoP profiling statistics (");
181 fprintf (file
, "BBS:%ld, ", n_p_bbs
);
182 fprintf (file
, "LOOPS:%ld, ", n_p_loops
);
183 fprintf (file
, "CONDITIONS:%ld, ", n_p_conditions
);
184 fprintf (file
, "STMTS:%ld)\n", n_p_stmts
);
187 /* Print statistics for SCOPS to FILE. */
190 print_graphite_statistics (FILE* file
, vec
<scop_p
> scops
)
196 FOR_EACH_VEC_ELT (scops
, i
, scop
)
197 print_graphite_scop_statistics (file
, scop
);
200 /* Initialize graphite: when there are no loops returns false. */
203 graphite_initialize (isl_ctx
*ctx
)
205 if (number_of_loops (cfun
) <= 1
206 /* FIXME: This limit on the number of basic blocks of a function
207 should be removed when the SCOP detection is faster. */
208 || (n_basic_blocks_for_fn (cfun
) >
209 PARAM_VALUE (PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION
)))
211 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
212 print_global_statistics (dump_file
);
219 recompute_all_dominators ();
220 initialize_original_copy_tables ();
222 if (dump_file
&& dump_flags
)
223 dump_function_to_file (current_function_decl
, dump_file
, dump_flags
);
228 /* Finalize graphite: perform CFG cleanup when NEED_CFG_CLEANUP_P is
232 graphite_finalize (bool need_cfg_cleanup_p
)
234 if (need_cfg_cleanup_p
)
238 profile_status_for_fn (cfun
) = PROFILE_ABSENT
;
239 release_recorded_exits ();
240 tree_estimate_probability ();
243 free_original_copy_tables ();
245 if (dump_file
&& dump_flags
)
246 print_loops (dump_file
, 3);
249 isl_ctx
*the_isl_ctx
;
251 /* Perform a set of linear transforms on the loops of the current
255 graphite_transform_loops (void)
259 bool need_cfg_cleanup_p
= false;
260 vec
<scop_p
> scops
= vNULL
;
263 /* If a function is parallel it was most probably already run through graphite
264 once. No need to run again. */
265 if (parallelized_function_p (cfun
->decl
))
268 ctx
= isl_ctx_alloc ();
269 isl_options_set_on_error (ctx
, ISL_ON_ERROR_ABORT
);
270 if (!graphite_initialize (ctx
))
274 build_scops (&scops
);
276 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
278 print_graphite_statistics (dump_file
, scops
);
279 print_global_statistics (dump_file
);
282 FOR_EACH_VEC_ELT (scops
, i
, scop
)
283 if (dbg_cnt (graphite_scop
))
286 build_poly_scop (scop
);
288 if (POLY_SCOP_P (scop
)
289 && apply_poly_transforms (scop
)
290 && graphite_regenerate_ast_isl (scop
))
291 need_cfg_cleanup_p
= true;
296 graphite_finalize (need_cfg_cleanup_p
);
301 #else /* If ISL is not available: #ifndef HAVE_isl. */
304 graphite_transform_loops (void)
306 sorry ("Graphite loop optimizations cannot be used (ISL is not available).");
313 graphite_transforms (struct function
*fun
)
315 if (number_of_loops (fun
) <= 1)
318 graphite_transform_loops ();
324 gate_graphite_transforms (void)
326 /* Enable -fgraphite pass if any one of the graphite optimization flags
329 || flag_loop_interchange
330 || flag_loop_strip_mine
331 || flag_graphite_identity
332 || flag_loop_parallelize_all
333 || flag_loop_optimize_isl
334 || flag_loop_unroll_jam
)
337 return flag_graphite
!= 0;
342 const pass_data pass_data_graphite
=
344 GIMPLE_PASS
, /* type */
345 "graphite0", /* name */
346 OPTGROUP_LOOP
, /* optinfo_flags */
347 TV_GRAPHITE
, /* tv_id */
348 ( PROP_cfg
| PROP_ssa
), /* properties_required */
349 0, /* properties_provided */
350 0, /* properties_destroyed */
351 0, /* todo_flags_start */
352 0, /* todo_flags_finish */
355 class pass_graphite
: public gimple_opt_pass
358 pass_graphite (gcc::context
*ctxt
)
359 : gimple_opt_pass (pass_data_graphite
, ctxt
)
362 /* opt_pass methods: */
363 virtual bool gate (function
*) { return gate_graphite_transforms (); }
365 }; // class pass_graphite
370 make_pass_graphite (gcc::context
*ctxt
)
372 return new pass_graphite (ctxt
);
377 const pass_data pass_data_graphite_transforms
=
379 GIMPLE_PASS
, /* type */
380 "graphite", /* name */
381 OPTGROUP_LOOP
, /* optinfo_flags */
382 TV_GRAPHITE_TRANSFORMS
, /* tv_id */
383 ( PROP_cfg
| PROP_ssa
), /* properties_required */
384 0, /* properties_provided */
385 0, /* properties_destroyed */
386 0, /* todo_flags_start */
387 0, /* todo_flags_finish */
390 class pass_graphite_transforms
: public gimple_opt_pass
393 pass_graphite_transforms (gcc::context
*ctxt
)
394 : gimple_opt_pass (pass_data_graphite_transforms
, ctxt
)
397 /* opt_pass methods: */
398 virtual bool gate (function
*) { return gate_graphite_transforms (); }
399 virtual unsigned int execute (function
*fun
) { return graphite_transforms (fun
); }
401 }; // class pass_graphite_transforms
406 make_pass_graphite_transforms (gcc::context
*ctxt
)
408 return new pass_graphite_transforms (ctxt
);