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