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f8bf9252 | 1 | /* Gimple Represented as Polyhedra. |
d1e082c2 | 2 | Copyright (C) 2006-2013 Free Software Foundation, Inc. |
f8bf9252 SP |
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 | |
204b560f | 23 | to GIMPLE. |
f8bf9252 SP |
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 | |
204b560f | 28 | the related work. |
f8bf9252 SP |
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" | |
33ad93b9 RG |
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 | ||
f8bf9252 SP |
47 | #include "system.h" |
48 | #include "coretypes.h" | |
32a73fc4 | 49 | #include "diagnostic-core.h" |
4d648807 | 50 | #include "tree.h" |
2fb9a547 AM |
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" | |
442b4905 | 56 | #include "gimple.h" |
5be5c238 | 57 | #include "gimple-iterator.h" |
442b4905 AM |
58 | #include "tree-cfg.h" |
59 | #include "tree-ssa-loop.h" | |
f8bf9252 | 60 | #include "tree-dump.h" |
f8bf9252 SP |
61 | #include "cfgloop.h" |
62 | #include "tree-chrec.h" | |
63 | #include "tree-data-ref.h" | |
64 | #include "tree-scalar-evolution.h" | |
204b560f | 65 | #include "sese.h" |
6a7441f5 | 66 | #include "dbgcnt.h" |
c1bf2a39 AM |
67 | #include "tree-parloops.h" |
68 | #include "tree-pass.h" | |
4484a35a | 69 | #include "tree-cfgcleanup.h" |
f8bf9252 SP |
70 | |
71 | #ifdef HAVE_cloog | |
bcbe3b25 | 72 | |
204b560f SP |
73 | #include "graphite-poly.h" |
74 | #include "graphite-scop-detection.h" | |
75 | #include "graphite-clast-to-gimple.h" | |
76 | #include "graphite-sese-to-poly.h" | |
4a8fb1a1 | 77 | #include "graphite-htab.h" |
f8bf9252 | 78 | |
57d598f7 SP |
79 | CloogState *cloog_state; |
80 | ||
204b560f | 81 | /* Print global statistics to FILE. */ |
4d6c7237 SP |
82 | |
83 | static void | |
204b560f | 84 | print_global_statistics (FILE* file) |
4d6c7237 | 85 | { |
204b560f SP |
86 | long n_bbs = 0; |
87 | long n_loops = 0; | |
88 | long n_stmts = 0; | |
89 | long n_conditions = 0; | |
90 | long n_p_bbs = 0; | |
91 | long n_p_loops = 0; | |
92 | long n_p_stmts = 0; | |
93 | long n_p_conditions = 0; | |
4d6c7237 | 94 | |
204b560f | 95 | basic_block bb; |
4d6c7237 | 96 | |
204b560f SP |
97 | FOR_ALL_BB (bb) |
98 | { | |
99 | gimple_stmt_iterator psi; | |
4d6c7237 | 100 | |
204b560f SP |
101 | n_bbs++; |
102 | n_p_bbs += bb->count; | |
4d6c7237 | 103 | |
204b560f SP |
104 | /* Ignore artificial surrounding loop. */ |
105 | if (bb == bb->loop_father->header | |
106 | && bb->index != 0) | |
4d6c7237 | 107 | { |
204b560f SP |
108 | n_loops++; |
109 | n_p_loops += bb->count; | |
4d6c7237 | 110 | } |
4d6c7237 | 111 | |
d630245f | 112 | if (EDGE_COUNT (bb->succs) > 1) |
204b560f SP |
113 | { |
114 | n_conditions++; | |
115 | n_p_conditions += bb->count; | |
116 | } | |
4d6c7237 | 117 | |
204b560f SP |
118 | for (psi = gsi_start_bb (bb); !gsi_end_p (psi); gsi_next (&psi)) |
119 | { | |
120 | n_stmts++; | |
121 | n_p_stmts += bb->count; | |
122 | } | |
4d6c7237 SP |
123 | } |
124 | ||
204b560f SP |
125 | fprintf (file, "\nGlobal statistics ("); |
126 | fprintf (file, "BBS:%ld, ", n_bbs); | |
127 | fprintf (file, "LOOPS:%ld, ", n_loops); | |
128 | fprintf (file, "CONDITIONS:%ld, ", n_conditions); | |
129 | fprintf (file, "STMTS:%ld)\n", n_stmts); | |
130 | fprintf (file, "\nGlobal profiling statistics ("); | |
131 | fprintf (file, "BBS:%ld, ", n_p_bbs); | |
132 | fprintf (file, "LOOPS:%ld, ", n_p_loops); | |
133 | fprintf (file, "CONDITIONS:%ld, ", n_p_conditions); | |
134 | fprintf (file, "STMTS:%ld)\n", n_p_stmts); | |
f8bf9252 SP |
135 | } |
136 | ||
204b560f | 137 | /* Print statistics for SCOP to FILE. */ |
f8bf9252 SP |
138 | |
139 | static void | |
204b560f | 140 | print_graphite_scop_statistics (FILE* file, scop_p scop) |
f8bf9252 | 141 | { |
204b560f SP |
142 | long n_bbs = 0; |
143 | long n_loops = 0; | |
144 | long n_stmts = 0; | |
145 | long n_conditions = 0; | |
146 | long n_p_bbs = 0; | |
147 | long n_p_loops = 0; | |
148 | long n_p_stmts = 0; | |
149 | long n_p_conditions = 0; | |
f8bf9252 | 150 | |
204b560f | 151 | basic_block bb; |
f8bf9252 | 152 | |
204b560f | 153 | FOR_ALL_BB (bb) |
f8bf9252 | 154 | { |
204b560f SP |
155 | gimple_stmt_iterator psi; |
156 | loop_p loop = bb->loop_father; | |
f8bf9252 | 157 | |
204b560f SP |
158 | if (!bb_in_sese_p (bb, SCOP_REGION (scop))) |
159 | continue; | |
f8bf9252 | 160 | |
204b560f SP |
161 | n_bbs++; |
162 | n_p_bbs += bb->count; | |
f8bf9252 | 163 | |
d630245f | 164 | if (EDGE_COUNT (bb->succs) > 1) |
f8bf9252 | 165 | { |
204b560f SP |
166 | n_conditions++; |
167 | n_p_conditions += bb->count; | |
f8bf9252 | 168 | } |
f8bf9252 | 169 | |
204b560f | 170 | for (psi = gsi_start_bb (bb); !gsi_end_p (psi); gsi_next (&psi)) |
f8bf9252 | 171 | { |
204b560f SP |
172 | n_stmts++; |
173 | n_p_stmts += bb->count; | |
f8bf9252 | 174 | } |
f8bf9252 | 175 | |
204b560f SP |
176 | if (loop->header == bb && loop_in_sese_p (loop, SCOP_REGION (scop))) |
177 | { | |
178 | n_loops++; | |
179 | n_p_loops += bb->count; | |
180 | } | |
181 | } | |
6a114766 | 182 | |
204b560f SP |
183 | fprintf (file, "\nSCoP statistics ("); |
184 | fprintf (file, "BBS:%ld, ", n_bbs); | |
185 | fprintf (file, "LOOPS:%ld, ", n_loops); | |
186 | fprintf (file, "CONDITIONS:%ld, ", n_conditions); | |
187 | fprintf (file, "STMTS:%ld)\n", n_stmts); | |
188 | fprintf (file, "\nSCoP profiling statistics ("); | |
189 | fprintf (file, "BBS:%ld, ", n_p_bbs); | |
190 | fprintf (file, "LOOPS:%ld, ", n_p_loops); | |
191 | fprintf (file, "CONDITIONS:%ld, ", n_p_conditions); | |
192 | fprintf (file, "STMTS:%ld)\n", n_p_stmts); | |
f8bf9252 SP |
193 | } |
194 | ||
204b560f | 195 | /* Print statistics for SCOPS to FILE. */ |
f8bf9252 | 196 | |
204b560f | 197 | static void |
9771b263 | 198 | print_graphite_statistics (FILE* file, vec<scop_p> scops) |
f8bf9252 | 199 | { |
f8bf9252 | 200 | int i; |
f8bf9252 | 201 | |
204b560f | 202 | scop_p scop; |
f8bf9252 | 203 | |
9771b263 | 204 | FOR_EACH_VEC_ELT (scops, i, scop) |
204b560f | 205 | print_graphite_scop_statistics (file, scop); |
f8bf9252 SP |
206 | } |
207 | ||
204b560f | 208 | /* Initialize graphite: when there are no loops returns false. */ |
f8bf9252 SP |
209 | |
210 | static bool | |
33ad93b9 | 211 | graphite_initialize (isl_ctx *ctx) |
f8bf9252 | 212 | { |
0fc822d0 | 213 | if (number_of_loops (cfun) <= 1 |
9bf13085 SP |
214 | /* FIXME: This limit on the number of basic blocks of a function |
215 | should be removed when the SCOP detection is faster. */ | |
0cae8d31 DM |
216 | || (n_basic_blocks_for_fn (cfun) > |
217 | PARAM_VALUE (PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION))) | |
f8bf9252 | 218 | { |
204b560f SP |
219 | if (dump_file && (dump_flags & TDF_DETAILS)) |
220 | print_global_statistics (dump_file); | |
f8bf9252 | 221 | |
33ad93b9 | 222 | isl_ctx_free (ctx); |
204b560f | 223 | return false; |
f8bf9252 SP |
224 | } |
225 | ||
cdb9802c | 226 | scev_reset (); |
204b560f SP |
227 | recompute_all_dominators (); |
228 | initialize_original_copy_tables (); | |
85437633 | 229 | |
33ad93b9 | 230 | cloog_state = cloog_isl_state_malloc (ctx); |
f8bf9252 | 231 | |
204b560f SP |
232 | if (dump_file && dump_flags) |
233 | dump_function_to_file (current_function_decl, dump_file, dump_flags); | |
f8bf9252 | 234 | |
204b560f | 235 | return true; |
f8bf9252 SP |
236 | } |
237 | ||
204b560f SP |
238 | /* Finalize graphite: perform CFG cleanup when NEED_CFG_CLEANUP_P is |
239 | true. */ | |
f8bf9252 SP |
240 | |
241 | static void | |
204b560f | 242 | graphite_finalize (bool need_cfg_cleanup_p) |
f8bf9252 | 243 | { |
204b560f | 244 | if (need_cfg_cleanup_p) |
8e88f9fd | 245 | { |
fd4a56ff | 246 | scev_reset (); |
8e88f9fd SP |
247 | cleanup_tree_cfg (); |
248 | profile_status = PROFILE_ABSENT; | |
249 | release_recorded_exits (); | |
250 | tree_estimate_probability (); | |
251 | } | |
f8bf9252 | 252 | |
57d598f7 | 253 | cloog_state_free (cloog_state); |
204b560f | 254 | free_original_copy_tables (); |
a61e3d2a | 255 | |
204b560f SP |
256 | if (dump_file && dump_flags) |
257 | print_loops (dump_file, 3); | |
f8bf9252 SP |
258 | } |
259 | ||
33ad93b9 RG |
260 | isl_ctx *the_isl_ctx; |
261 | ||
f8bf9252 SP |
262 | /* Perform a set of linear transforms on the loops of the current |
263 | function. */ | |
264 | ||
265 | void | |
266 | graphite_transform_loops (void) | |
267 | { | |
268 | int i; | |
269 | scop_p scop; | |
204b560f | 270 | bool need_cfg_cleanup_p = false; |
6e1aa848 | 271 | vec<scop_p> scops = vNULL; |
4a8fb1a1 | 272 | bb_pbb_htab_type bb_pbb_mapping; |
33ad93b9 | 273 | isl_ctx *ctx; |
f8bf9252 | 274 | |
62e0a1ed RG |
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 | ||
33ad93b9 | 280 | ctx = isl_ctx_alloc (); |
c3284718 | 281 | isl_options_set_on_error (ctx, ISL_ON_ERROR_ABORT); |
33ad93b9 | 282 | if (!graphite_initialize (ctx)) |
f8bf9252 SP |
283 | return; |
284 | ||
33ad93b9 | 285 | the_isl_ctx = ctx; |
204b560f | 286 | build_scops (&scops); |
f8bf9252 SP |
287 | |
288 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
f8bf9252 | 289 | { |
204b560f SP |
290 | print_graphite_statistics (dump_file, scops); |
291 | print_global_statistics (dump_file); | |
292 | } | |
0b040072 | 293 | |
4a8fb1a1 | 294 | bb_pbb_mapping.create (10); |
3a7086cc | 295 | |
9771b263 | 296 | FOR_EACH_VEC_ELT (scops, i, scop) |
6a7441f5 SP |
297 | if (dbg_cnt (graphite_scop)) |
298 | { | |
33ad93b9 | 299 | scop->ctx = ctx; |
efa21390 | 300 | build_poly_scop (scop); |
f8bf9252 | 301 | |
efa21390 SP |
302 | if (POLY_SCOP_P (scop) |
303 | && apply_poly_transforms (scop) | |
304 | && gloog (scop, bb_pbb_mapping)) | |
305 | need_cfg_cleanup_p = true; | |
306 | } | |
f8bf9252 | 307 | |
4a8fb1a1 | 308 | bb_pbb_mapping.dispose (); |
204b560f SP |
309 | free_scops (scops); |
310 | graphite_finalize (need_cfg_cleanup_p); | |
33ad93b9 RG |
311 | the_isl_ctx = NULL; |
312 | isl_ctx_free (ctx); | |
f8bf9252 SP |
313 | } |
314 | ||
315 | #else /* If Cloog is not available: #ifndef HAVE_cloog. */ | |
316 | ||
c1bf2a39 | 317 | static void |
f8bf9252 SP |
318 | graphite_transform_loops (void) |
319 | { | |
f8bf9252 SP |
320 | sorry ("Graphite loop optimizations cannot be used"); |
321 | } | |
322 | ||
323 | #endif | |
c1bf2a39 AM |
324 | |
325 | ||
326 | static unsigned int | |
327 | graphite_transforms (void) | |
328 | { | |
329 | if (!current_loops) | |
330 | return 0; | |
331 | ||
332 | graphite_transform_loops (); | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static bool | |
338 | gate_graphite_transforms (void) | |
339 | { | |
340 | /* Enable -fgraphite pass if any one of the graphite optimization flags | |
341 | is turned on. */ | |
342 | if (flag_loop_block | |
343 | || flag_loop_interchange | |
344 | || flag_loop_strip_mine | |
345 | || flag_graphite_identity | |
346 | || flag_loop_parallelize_all | |
347 | || flag_loop_optimize_isl) | |
348 | flag_graphite = 1; | |
349 | ||
350 | return flag_graphite != 0; | |
351 | } | |
352 | ||
353 | namespace { | |
354 | ||
355 | const pass_data pass_data_graphite = | |
356 | { | |
357 | GIMPLE_PASS, /* type */ | |
358 | "graphite0", /* name */ | |
359 | OPTGROUP_LOOP, /* optinfo_flags */ | |
360 | true, /* has_gate */ | |
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: */ | |
378 | bool gate () { return gate_graphite_transforms (); } | |
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 */ | |
397 | true, /* has_gate */ | |
398 | true, /* has_execute */ | |
399 | TV_GRAPHITE_TRANSFORMS, /* tv_id */ | |
400 | ( PROP_cfg | PROP_ssa ), /* properties_required */ | |
401 | 0, /* properties_provided */ | |
402 | 0, /* properties_destroyed */ | |
403 | 0, /* todo_flags_start */ | |
404 | 0, /* todo_flags_finish */ | |
405 | }; | |
406 | ||
407 | class pass_graphite_transforms : public gimple_opt_pass | |
408 | { | |
409 | public: | |
410 | pass_graphite_transforms (gcc::context *ctxt) | |
411 | : gimple_opt_pass (pass_data_graphite_transforms, ctxt) | |
412 | {} | |
413 | ||
414 | /* opt_pass methods: */ | |
415 | bool gate () { return gate_graphite_transforms (); } | |
416 | unsigned int execute () { return graphite_transforms (); } | |
417 | ||
418 | }; // class pass_graphite_transforms | |
419 | ||
420 | } // anon namespace | |
421 | ||
422 | gimple_opt_pass * | |
423 | make_pass_graphite_transforms (gcc::context *ctxt) | |
424 | { | |
425 | return new pass_graphite_transforms (ctxt); | |
426 | } | |
427 | ||
428 |