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255b6be7 | 1 | /* Gimple Represented as Polyhedra. |
3aea1f79 | 2 | Copyright (C) 2006-2014 Free Software Foundation, Inc. |
255b6be7 | 3 | Contributed by Sebastian Pop <sebastian.pop@inria.fr>. |
4 | ||
5 | This file is part of GCC. | |
6 | ||
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) | |
10 | any later version. | |
11 | ||
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. | |
16 | ||
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/>. */ | |
20 | ||
21 | /* This pass converts GIMPLE to GRAPHITE, performs some loop | |
22 | transformations and then converts the resulting representation back | |
26c166eb | 23 | to GIMPLE. |
255b6be7 | 24 | |
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 | |
26c166eb | 28 | the related work. |
255b6be7 | 29 | |
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. */ | |
34 | ||
35 | #include "config.h" | |
87e20041 | 36 | |
429cca51 | 37 | #ifdef HAVE_isl |
87e20041 | 38 | #include <isl/set.h> |
39 | #include <isl/map.h> | |
40 | #include <isl/options.h> | |
41 | #include <isl/union_map.h> | |
429cca51 | 42 | #ifdef HAVE_cloog |
87e20041 | 43 | #include <cloog/cloog.h> |
44 | #include <cloog/isl/domain.h> | |
45 | #include <cloog/isl/cloog.h> | |
46 | #endif | |
429cca51 | 47 | #endif |
87e20041 | 48 | |
255b6be7 | 49 | #include "system.h" |
50 | #include "coretypes.h" | |
52f91c04 | 51 | #include "diagnostic-core.h" |
41a8aa41 | 52 | #include "tree.h" |
bc61cadb | 53 | #include "basic-block.h" |
54 | #include "tree-ssa-alias.h" | |
55 | #include "internal-fn.h" | |
56 | #include "gimple-expr.h" | |
57 | #include "is-a.h" | |
073c1fd5 | 58 | #include "gimple.h" |
dcf1a1ec | 59 | #include "gimple-iterator.h" |
073c1fd5 | 60 | #include "tree-cfg.h" |
61 | #include "tree-ssa-loop.h" | |
255b6be7 | 62 | #include "tree-dump.h" |
255b6be7 | 63 | #include "cfgloop.h" |
64 | #include "tree-chrec.h" | |
65 | #include "tree-data-ref.h" | |
66 | #include "tree-scalar-evolution.h" | |
26c166eb | 67 | #include "sese.h" |
e819c864 | 68 | #include "dbgcnt.h" |
64641360 | 69 | #include "tree-parloops.h" |
70 | #include "tree-pass.h" | |
424a4a92 | 71 | #include "tree-cfgcleanup.h" |
255b6be7 | 72 | |
429cca51 | 73 | #ifdef HAVE_isl |
d970c7fe | 74 | |
26c166eb | 75 | #include "graphite-poly.h" |
76 | #include "graphite-scop-detection.h" | |
5eb0077d | 77 | #include "graphite-isl-ast-to-gimple.h" |
26c166eb | 78 | #include "graphite-sese-to-poly.h" |
d9dd21a8 | 79 | #include "graphite-htab.h" |
255b6be7 | 80 | |
429cca51 | 81 | #ifdef HAVE_cloog |
82 | #include "graphite-clast-to-gimple.h" | |
83 | ||
98b9957e | 84 | CloogState *cloog_state; |
429cca51 | 85 | #endif |
98b9957e | 86 | |
26c166eb | 87 | /* Print global statistics to FILE. */ |
7d3f5847 | 88 | |
89 | static void | |
26c166eb | 90 | print_global_statistics (FILE* file) |
7d3f5847 | 91 | { |
26c166eb | 92 | long n_bbs = 0; |
93 | long n_loops = 0; | |
94 | long n_stmts = 0; | |
95 | long n_conditions = 0; | |
96 | long n_p_bbs = 0; | |
97 | long n_p_loops = 0; | |
98 | long n_p_stmts = 0; | |
99 | long n_p_conditions = 0; | |
7d3f5847 | 100 | |
26c166eb | 101 | basic_block bb; |
7d3f5847 | 102 | |
ed7d889a | 103 | FOR_ALL_BB_FN (bb, cfun) |
26c166eb | 104 | { |
105 | gimple_stmt_iterator psi; | |
7d3f5847 | 106 | |
26c166eb | 107 | n_bbs++; |
108 | n_p_bbs += bb->count; | |
7d3f5847 | 109 | |
26c166eb | 110 | /* Ignore artificial surrounding loop. */ |
111 | if (bb == bb->loop_father->header | |
112 | && bb->index != 0) | |
7d3f5847 | 113 | { |
26c166eb | 114 | n_loops++; |
115 | n_p_loops += bb->count; | |
7d3f5847 | 116 | } |
7d3f5847 | 117 | |
7bf60644 | 118 | if (EDGE_COUNT (bb->succs) > 1) |
26c166eb | 119 | { |
120 | n_conditions++; | |
121 | n_p_conditions += bb->count; | |
122 | } | |
7d3f5847 | 123 | |
26c166eb | 124 | for (psi = gsi_start_bb (bb); !gsi_end_p (psi); gsi_next (&psi)) |
125 | { | |
126 | n_stmts++; | |
127 | n_p_stmts += bb->count; | |
128 | } | |
7d3f5847 | 129 | } |
130 | ||
26c166eb | 131 | fprintf (file, "\nGlobal statistics ("); |
132 | fprintf (file, "BBS:%ld, ", n_bbs); | |
133 | fprintf (file, "LOOPS:%ld, ", n_loops); | |
134 | fprintf (file, "CONDITIONS:%ld, ", n_conditions); | |
135 | fprintf (file, "STMTS:%ld)\n", n_stmts); | |
136 | fprintf (file, "\nGlobal profiling statistics ("); | |
137 | fprintf (file, "BBS:%ld, ", n_p_bbs); | |
138 | fprintf (file, "LOOPS:%ld, ", n_p_loops); | |
139 | fprintf (file, "CONDITIONS:%ld, ", n_p_conditions); | |
140 | fprintf (file, "STMTS:%ld)\n", n_p_stmts); | |
255b6be7 | 141 | } |
142 | ||
26c166eb | 143 | /* Print statistics for SCOP to FILE. */ |
255b6be7 | 144 | |
145 | static void | |
26c166eb | 146 | print_graphite_scop_statistics (FILE* file, scop_p scop) |
255b6be7 | 147 | { |
26c166eb | 148 | long n_bbs = 0; |
149 | long n_loops = 0; | |
150 | long n_stmts = 0; | |
151 | long n_conditions = 0; | |
152 | long n_p_bbs = 0; | |
153 | long n_p_loops = 0; | |
154 | long n_p_stmts = 0; | |
155 | long n_p_conditions = 0; | |
255b6be7 | 156 | |
26c166eb | 157 | basic_block bb; |
255b6be7 | 158 | |
ed7d889a | 159 | FOR_ALL_BB_FN (bb, cfun) |
255b6be7 | 160 | { |
26c166eb | 161 | gimple_stmt_iterator psi; |
162 | loop_p loop = bb->loop_father; | |
255b6be7 | 163 | |
26c166eb | 164 | if (!bb_in_sese_p (bb, SCOP_REGION (scop))) |
165 | continue; | |
255b6be7 | 166 | |
26c166eb | 167 | n_bbs++; |
168 | n_p_bbs += bb->count; | |
255b6be7 | 169 | |
7bf60644 | 170 | if (EDGE_COUNT (bb->succs) > 1) |
255b6be7 | 171 | { |
26c166eb | 172 | n_conditions++; |
173 | n_p_conditions += bb->count; | |
255b6be7 | 174 | } |
255b6be7 | 175 | |
26c166eb | 176 | for (psi = gsi_start_bb (bb); !gsi_end_p (psi); gsi_next (&psi)) |
255b6be7 | 177 | { |
26c166eb | 178 | n_stmts++; |
179 | n_p_stmts += bb->count; | |
255b6be7 | 180 | } |
255b6be7 | 181 | |
26c166eb | 182 | if (loop->header == bb && loop_in_sese_p (loop, SCOP_REGION (scop))) |
183 | { | |
184 | n_loops++; | |
185 | n_p_loops += bb->count; | |
186 | } | |
187 | } | |
145bdf6a | 188 | |
26c166eb | 189 | fprintf (file, "\nSCoP statistics ("); |
190 | fprintf (file, "BBS:%ld, ", n_bbs); | |
191 | fprintf (file, "LOOPS:%ld, ", n_loops); | |
192 | fprintf (file, "CONDITIONS:%ld, ", n_conditions); | |
193 | fprintf (file, "STMTS:%ld)\n", n_stmts); | |
194 | fprintf (file, "\nSCoP profiling statistics ("); | |
195 | fprintf (file, "BBS:%ld, ", n_p_bbs); | |
196 | fprintf (file, "LOOPS:%ld, ", n_p_loops); | |
197 | fprintf (file, "CONDITIONS:%ld, ", n_p_conditions); | |
198 | fprintf (file, "STMTS:%ld)\n", n_p_stmts); | |
255b6be7 | 199 | } |
200 | ||
26c166eb | 201 | /* Print statistics for SCOPS to FILE. */ |
255b6be7 | 202 | |
26c166eb | 203 | static void |
f1f41a6c | 204 | print_graphite_statistics (FILE* file, vec<scop_p> scops) |
255b6be7 | 205 | { |
255b6be7 | 206 | int i; |
255b6be7 | 207 | |
26c166eb | 208 | scop_p scop; |
255b6be7 | 209 | |
f1f41a6c | 210 | FOR_EACH_VEC_ELT (scops, i, scop) |
26c166eb | 211 | print_graphite_scop_statistics (file, scop); |
255b6be7 | 212 | } |
213 | ||
26c166eb | 214 | /* Initialize graphite: when there are no loops returns false. */ |
255b6be7 | 215 | |
216 | static bool | |
87e20041 | 217 | graphite_initialize (isl_ctx *ctx) |
255b6be7 | 218 | { |
41f75a99 | 219 | if (number_of_loops (cfun) <= 1 |
ef98ee10 | 220 | /* FIXME: This limit on the number of basic blocks of a function |
221 | should be removed when the SCOP detection is faster. */ | |
a28770e1 | 222 | || (n_basic_blocks_for_fn (cfun) > |
223 | PARAM_VALUE (PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION))) | |
255b6be7 | 224 | { |
26c166eb | 225 | if (dump_file && (dump_flags & TDF_DETAILS)) |
226 | print_global_statistics (dump_file); | |
255b6be7 | 227 | |
87e20041 | 228 | isl_ctx_free (ctx); |
26c166eb | 229 | return false; |
255b6be7 | 230 | } |
231 | ||
d4d6f501 | 232 | scev_reset (); |
26c166eb | 233 | recompute_all_dominators (); |
234 | initialize_original_copy_tables (); | |
f0fc00f2 | 235 | |
429cca51 | 236 | #ifdef HAVE_cloog |
87e20041 | 237 | cloog_state = cloog_isl_state_malloc (ctx); |
429cca51 | 238 | #endif |
255b6be7 | 239 | |
26c166eb | 240 | if (dump_file && dump_flags) |
241 | dump_function_to_file (current_function_decl, dump_file, dump_flags); | |
255b6be7 | 242 | |
26c166eb | 243 | return true; |
255b6be7 | 244 | } |
245 | ||
26c166eb | 246 | /* Finalize graphite: perform CFG cleanup when NEED_CFG_CLEANUP_P is |
247 | true. */ | |
255b6be7 | 248 | |
249 | static void | |
26c166eb | 250 | graphite_finalize (bool need_cfg_cleanup_p) |
255b6be7 | 251 | { |
26c166eb | 252 | if (need_cfg_cleanup_p) |
675d86b2 | 253 | { |
d9458edc | 254 | scev_reset (); |
675d86b2 | 255 | cleanup_tree_cfg (); |
f26d8580 | 256 | profile_status_for_fn (cfun) = PROFILE_ABSENT; |
675d86b2 | 257 | release_recorded_exits (); |
258 | tree_estimate_probability (); | |
259 | } | |
255b6be7 | 260 | |
429cca51 | 261 | #ifdef HAVE_cloog |
98b9957e | 262 | cloog_state_free (cloog_state); |
429cca51 | 263 | #endif |
26c166eb | 264 | free_original_copy_tables (); |
d0483ac6 | 265 | |
26c166eb | 266 | if (dump_file && dump_flags) |
267 | print_loops (dump_file, 3); | |
255b6be7 | 268 | } |
269 | ||
87e20041 | 270 | isl_ctx *the_isl_ctx; |
271 | ||
255b6be7 | 272 | /* Perform a set of linear transforms on the loops of the current |
273 | function. */ | |
274 | ||
275 | void | |
276 | graphite_transform_loops (void) | |
277 | { | |
278 | int i; | |
279 | scop_p scop; | |
26c166eb | 280 | bool need_cfg_cleanup_p = false; |
1e094109 | 281 | vec<scop_p> scops = vNULL; |
87e20041 | 282 | isl_ctx *ctx; |
255b6be7 | 283 | |
479a6d79 | 284 | /* If a function is parallel it was most probably already run through graphite |
285 | once. No need to run again. */ | |
286 | if (parallelized_function_p (cfun->decl)) | |
287 | return; | |
288 | ||
87e20041 | 289 | ctx = isl_ctx_alloc (); |
9af5ce0c | 290 | isl_options_set_on_error (ctx, ISL_ON_ERROR_ABORT); |
87e20041 | 291 | if (!graphite_initialize (ctx)) |
255b6be7 | 292 | return; |
293 | ||
87e20041 | 294 | the_isl_ctx = ctx; |
26c166eb | 295 | build_scops (&scops); |
255b6be7 | 296 | |
297 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
255b6be7 | 298 | { |
26c166eb | 299 | print_graphite_statistics (dump_file, scops); |
300 | print_global_statistics (dump_file); | |
301 | } | |
35fb1eb0 | 302 | |
c1f445d2 | 303 | bb_pbb_htab_type bb_pbb_mapping (10); |
429cca51 | 304 | |
305 | #ifndef HAVE_cloog | |
306 | if(flag_graphite_code_gen == FGRAPHITE_CODE_GEN_CLOOG) | |
307 | { | |
308 | flag_graphite_code_gen = FGRAPHITE_CODE_GEN_ISL; | |
309 | printf ("The CLooG code generator cannot be used (CLooG is not " | |
310 | "available). The ISL code generator was chosen.\n"); | |
311 | } | |
312 | #endif | |
313 | ||
f1f41a6c | 314 | FOR_EACH_VEC_ELT (scops, i, scop) |
e819c864 | 315 | if (dbg_cnt (graphite_scop)) |
316 | { | |
87e20041 | 317 | scop->ctx = ctx; |
8c6b3774 | 318 | build_poly_scop (scop); |
255b6be7 | 319 | |
429cca51 | 320 | #ifdef HAVE_cloog |
8c6b3774 | 321 | if (POLY_SCOP_P (scop) |
322 | && apply_poly_transforms (scop) | |
5eb0077d | 323 | && (((flag_graphite_code_gen == FGRAPHITE_CODE_GEN_ISL) |
324 | && graphite_regenerate_ast_isl (scop)) | |
325 | || ((flag_graphite_code_gen == FGRAPHITE_CODE_GEN_CLOOG) | |
326 | && graphite_regenerate_ast_cloog (scop, &bb_pbb_mapping)))) | |
8c6b3774 | 327 | need_cfg_cleanup_p = true; |
429cca51 | 328 | #else |
329 | if (POLY_SCOP_P (scop) | |
330 | && apply_poly_transforms (scop) | |
331 | && graphite_regenerate_ast_isl (scop)) | |
332 | need_cfg_cleanup_p = true; | |
333 | #endif | |
334 | ||
8c6b3774 | 335 | } |
255b6be7 | 336 | |
26c166eb | 337 | free_scops (scops); |
338 | graphite_finalize (need_cfg_cleanup_p); | |
87e20041 | 339 | the_isl_ctx = NULL; |
340 | isl_ctx_free (ctx); | |
255b6be7 | 341 | } |
342 | ||
429cca51 | 343 | #else /* If ISL is not available: #ifndef HAVE_isl. */ |
255b6be7 | 344 | |
64641360 | 345 | static void |
255b6be7 | 346 | graphite_transform_loops (void) |
347 | { | |
429cca51 | 348 | sorry ("Graphite loop optimizations cannot be used (ISL is not available)."); |
255b6be7 | 349 | } |
350 | ||
351 | #endif | |
64641360 | 352 | |
353 | ||
354 | static unsigned int | |
b3083327 | 355 | graphite_transforms (struct function *fun) |
64641360 | 356 | { |
b3083327 | 357 | if (number_of_loops (fun) <= 1) |
64641360 | 358 | return 0; |
359 | ||
360 | graphite_transform_loops (); | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
365 | static bool | |
366 | gate_graphite_transforms (void) | |
367 | { | |
368 | /* Enable -fgraphite pass if any one of the graphite optimization flags | |
369 | is turned on. */ | |
370 | if (flag_loop_block | |
371 | || flag_loop_interchange | |
372 | || flag_loop_strip_mine | |
373 | || flag_graphite_identity | |
374 | || flag_loop_parallelize_all | |
375 | || flag_loop_optimize_isl) | |
376 | flag_graphite = 1; | |
377 | ||
378 | return flag_graphite != 0; | |
379 | } | |
380 | ||
381 | namespace { | |
382 | ||
383 | const pass_data pass_data_graphite = | |
384 | { | |
385 | GIMPLE_PASS, /* type */ | |
386 | "graphite0", /* name */ | |
387 | OPTGROUP_LOOP, /* optinfo_flags */ | |
64641360 | 388 | TV_GRAPHITE, /* tv_id */ |
389 | ( PROP_cfg | PROP_ssa ), /* properties_required */ | |
390 | 0, /* properties_provided */ | |
391 | 0, /* properties_destroyed */ | |
392 | 0, /* todo_flags_start */ | |
393 | 0, /* todo_flags_finish */ | |
394 | }; | |
395 | ||
396 | class pass_graphite : public gimple_opt_pass | |
397 | { | |
398 | public: | |
399 | pass_graphite (gcc::context *ctxt) | |
400 | : gimple_opt_pass (pass_data_graphite, ctxt) | |
401 | {} | |
402 | ||
403 | /* opt_pass methods: */ | |
31315c24 | 404 | virtual bool gate (function *) { return gate_graphite_transforms (); } |
64641360 | 405 | |
406 | }; // class pass_graphite | |
407 | ||
408 | } // anon namespace | |
409 | ||
410 | gimple_opt_pass * | |
411 | make_pass_graphite (gcc::context *ctxt) | |
412 | { | |
413 | return new pass_graphite (ctxt); | |
414 | } | |
415 | ||
416 | namespace { | |
417 | ||
418 | const pass_data pass_data_graphite_transforms = | |
419 | { | |
420 | GIMPLE_PASS, /* type */ | |
421 | "graphite", /* name */ | |
422 | OPTGROUP_LOOP, /* optinfo_flags */ | |
64641360 | 423 | TV_GRAPHITE_TRANSFORMS, /* tv_id */ |
424 | ( PROP_cfg | PROP_ssa ), /* properties_required */ | |
425 | 0, /* properties_provided */ | |
426 | 0, /* properties_destroyed */ | |
427 | 0, /* todo_flags_start */ | |
428 | 0, /* todo_flags_finish */ | |
429 | }; | |
430 | ||
431 | class pass_graphite_transforms : public gimple_opt_pass | |
432 | { | |
433 | public: | |
434 | pass_graphite_transforms (gcc::context *ctxt) | |
435 | : gimple_opt_pass (pass_data_graphite_transforms, ctxt) | |
436 | {} | |
437 | ||
438 | /* opt_pass methods: */ | |
31315c24 | 439 | virtual bool gate (function *) { return gate_graphite_transforms (); } |
b3083327 | 440 | virtual unsigned int execute (function *fun) { return graphite_transforms (fun); } |
64641360 | 441 | |
442 | }; // class pass_graphite_transforms | |
443 | ||
444 | } // anon namespace | |
445 | ||
446 | gimple_opt_pass * | |
447 | make_pass_graphite_transforms (gcc::context *ctxt) | |
448 | { | |
449 | return new pass_graphite_transforms (ctxt); | |
450 | } | |
451 | ||
452 |