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f8bf9252 | 1 | /* Gimple Represented as Polyhedra. |
5624e564 | 2 | Copyright (C) 2006-2015 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 | 36 | |
eae1a5d4 | 37 | #ifdef HAVE_isl |
4bc190dc JW |
38 | /* Workaround for GMP 5.1.3 bug, see PR56019. */ |
39 | #include <stddef.h> | |
40 | ||
32400032 | 41 | #include <isl/constraint.h> |
33ad93b9 RG |
42 | #include <isl/set.h> |
43 | #include <isl/map.h> | |
44 | #include <isl/options.h> | |
45 | #include <isl/union_map.h> | |
eae1a5d4 | 46 | #endif |
33ad93b9 | 47 | |
f8bf9252 SP |
48 | #include "system.h" |
49 | #include "coretypes.h" | |
c7131fb2 | 50 | #include "backend.h" |
9c358739 AM |
51 | #include "diagnostic-core.h" |
52 | #include "cfgloop.h" | |
53 | #include "tree-pass.h" | |
49b8fe6c | 54 | #include "params.h" |
9c358739 AM |
55 | |
56 | #ifdef HAVE_isl | |
9fdcd34e | 57 | #include "cfghooks.h" |
40e23961 | 58 | #include "tree.h" |
c7131fb2 | 59 | #include "gimple.h" |
c7131fb2 | 60 | #include "fold-const.h" |
5be5c238 | 61 | #include "gimple-iterator.h" |
442b4905 AM |
62 | #include "tree-cfg.h" |
63 | #include "tree-ssa-loop.h" | |
f8bf9252 SP |
64 | #include "tree-data-ref.h" |
65 | #include "tree-scalar-evolution.h" | |
9c358739 | 66 | #include "graphite-poly.h" |
6a7441f5 | 67 | #include "dbgcnt.h" |
c1bf2a39 | 68 | #include "tree-parloops.h" |
4484a35a | 69 | #include "tree-cfgcleanup.h" |
204b560f | 70 | #include "graphite-scop-detection.h" |
f6cc3103 | 71 | #include "graphite-isl-ast-to-gimple.h" |
204b560f | 72 | #include "graphite-sese-to-poly.h" |
57d598f7 | 73 | |
204b560f | 74 | /* Print global statistics to FILE. */ |
4d6c7237 SP |
75 | |
76 | static void | |
204b560f | 77 | print_global_statistics (FILE* file) |
4d6c7237 | 78 | { |
204b560f SP |
79 | long n_bbs = 0; |
80 | long n_loops = 0; | |
81 | long n_stmts = 0; | |
82 | long n_conditions = 0; | |
83 | long n_p_bbs = 0; | |
84 | long n_p_loops = 0; | |
85 | long n_p_stmts = 0; | |
86 | long n_p_conditions = 0; | |
4d6c7237 | 87 | |
204b560f | 88 | basic_block bb; |
4d6c7237 | 89 | |
04a90bec | 90 | FOR_ALL_BB_FN (bb, cfun) |
204b560f SP |
91 | { |
92 | gimple_stmt_iterator psi; | |
4d6c7237 | 93 | |
204b560f SP |
94 | n_bbs++; |
95 | n_p_bbs += bb->count; | |
4d6c7237 | 96 | |
204b560f SP |
97 | /* Ignore artificial surrounding loop. */ |
98 | if (bb == bb->loop_father->header | |
99 | && bb->index != 0) | |
4d6c7237 | 100 | { |
204b560f SP |
101 | n_loops++; |
102 | n_p_loops += bb->count; | |
4d6c7237 | 103 | } |
4d6c7237 | 104 | |
d630245f | 105 | if (EDGE_COUNT (bb->succs) > 1) |
204b560f SP |
106 | { |
107 | n_conditions++; | |
108 | n_p_conditions += bb->count; | |
109 | } | |
4d6c7237 | 110 | |
204b560f SP |
111 | for (psi = gsi_start_bb (bb); !gsi_end_p (psi); gsi_next (&psi)) |
112 | { | |
113 | n_stmts++; | |
114 | n_p_stmts += bb->count; | |
115 | } | |
4d6c7237 SP |
116 | } |
117 | ||
204b560f SP |
118 | fprintf (file, "\nGlobal statistics ("); |
119 | fprintf (file, "BBS:%ld, ", n_bbs); | |
120 | fprintf (file, "LOOPS:%ld, ", n_loops); | |
121 | fprintf (file, "CONDITIONS:%ld, ", n_conditions); | |
122 | fprintf (file, "STMTS:%ld)\n", n_stmts); | |
123 | fprintf (file, "\nGlobal profiling statistics ("); | |
124 | fprintf (file, "BBS:%ld, ", n_p_bbs); | |
125 | fprintf (file, "LOOPS:%ld, ", n_p_loops); | |
126 | fprintf (file, "CONDITIONS:%ld, ", n_p_conditions); | |
127 | fprintf (file, "STMTS:%ld)\n", n_p_stmts); | |
f8bf9252 SP |
128 | } |
129 | ||
204b560f | 130 | /* Print statistics for SCOP to FILE. */ |
f8bf9252 SP |
131 | |
132 | static void | |
204b560f | 133 | print_graphite_scop_statistics (FILE* file, scop_p scop) |
f8bf9252 | 134 | { |
204b560f SP |
135 | long n_bbs = 0; |
136 | long n_loops = 0; | |
137 | long n_stmts = 0; | |
138 | long n_conditions = 0; | |
139 | long n_p_bbs = 0; | |
140 | long n_p_loops = 0; | |
141 | long n_p_stmts = 0; | |
142 | long n_p_conditions = 0; | |
f8bf9252 | 143 | |
204b560f | 144 | basic_block bb; |
f8bf9252 | 145 | |
04a90bec | 146 | FOR_ALL_BB_FN (bb, cfun) |
f8bf9252 | 147 | { |
204b560f SP |
148 | gimple_stmt_iterator psi; |
149 | loop_p loop = bb->loop_father; | |
f8bf9252 | 150 | |
204b560f SP |
151 | if (!bb_in_sese_p (bb, SCOP_REGION (scop))) |
152 | continue; | |
f8bf9252 | 153 | |
204b560f SP |
154 | n_bbs++; |
155 | n_p_bbs += bb->count; | |
f8bf9252 | 156 | |
d630245f | 157 | if (EDGE_COUNT (bb->succs) > 1) |
f8bf9252 | 158 | { |
204b560f SP |
159 | n_conditions++; |
160 | n_p_conditions += bb->count; | |
f8bf9252 | 161 | } |
f8bf9252 | 162 | |
204b560f | 163 | for (psi = gsi_start_bb (bb); !gsi_end_p (psi); gsi_next (&psi)) |
f8bf9252 | 164 | { |
204b560f SP |
165 | n_stmts++; |
166 | n_p_stmts += bb->count; | |
f8bf9252 | 167 | } |
f8bf9252 | 168 | |
204b560f SP |
169 | if (loop->header == bb && loop_in_sese_p (loop, SCOP_REGION (scop))) |
170 | { | |
171 | n_loops++; | |
172 | n_p_loops += bb->count; | |
173 | } | |
174 | } | |
6a114766 | 175 | |
204b560f SP |
176 | fprintf (file, "\nSCoP statistics ("); |
177 | fprintf (file, "BBS:%ld, ", n_bbs); | |
178 | fprintf (file, "LOOPS:%ld, ", n_loops); | |
179 | fprintf (file, "CONDITIONS:%ld, ", n_conditions); | |
180 | fprintf (file, "STMTS:%ld)\n", n_stmts); | |
181 | fprintf (file, "\nSCoP profiling statistics ("); | |
182 | fprintf (file, "BBS:%ld, ", n_p_bbs); | |
183 | fprintf (file, "LOOPS:%ld, ", n_p_loops); | |
184 | fprintf (file, "CONDITIONS:%ld, ", n_p_conditions); | |
185 | fprintf (file, "STMTS:%ld)\n", n_p_stmts); | |
f8bf9252 SP |
186 | } |
187 | ||
204b560f | 188 | /* Print statistics for SCOPS to FILE. */ |
f8bf9252 | 189 | |
204b560f | 190 | static void |
9771b263 | 191 | print_graphite_statistics (FILE* file, vec<scop_p> scops) |
f8bf9252 | 192 | { |
f8bf9252 | 193 | int i; |
f8bf9252 | 194 | |
204b560f | 195 | scop_p scop; |
f8bf9252 | 196 | |
9771b263 | 197 | FOR_EACH_VEC_ELT (scops, i, scop) |
204b560f | 198 | print_graphite_scop_statistics (file, scop); |
f8bf9252 SP |
199 | } |
200 | ||
204b560f | 201 | /* Initialize graphite: when there are no loops returns false. */ |
f8bf9252 SP |
202 | |
203 | static bool | |
33ad93b9 | 204 | graphite_initialize (isl_ctx *ctx) |
f8bf9252 | 205 | { |
0fc822d0 | 206 | if (number_of_loops (cfun) <= 1 |
9bf13085 SP |
207 | /* FIXME: This limit on the number of basic blocks of a function |
208 | should be removed when the SCOP detection is faster. */ | |
0cae8d31 DM |
209 | || (n_basic_blocks_for_fn (cfun) > |
210 | PARAM_VALUE (PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION))) | |
f8bf9252 | 211 | { |
204b560f SP |
212 | if (dump_file && (dump_flags & TDF_DETAILS)) |
213 | print_global_statistics (dump_file); | |
f8bf9252 | 214 | |
33ad93b9 | 215 | isl_ctx_free (ctx); |
204b560f | 216 | return false; |
f8bf9252 SP |
217 | } |
218 | ||
cdb9802c | 219 | scev_reset (); |
204b560f SP |
220 | recompute_all_dominators (); |
221 | initialize_original_copy_tables (); | |
85437633 | 222 | |
204b560f SP |
223 | if (dump_file && dump_flags) |
224 | dump_function_to_file (current_function_decl, dump_file, dump_flags); | |
f8bf9252 | 225 | |
204b560f | 226 | return true; |
f8bf9252 SP |
227 | } |
228 | ||
204b560f SP |
229 | /* Finalize graphite: perform CFG cleanup when NEED_CFG_CLEANUP_P is |
230 | true. */ | |
f8bf9252 SP |
231 | |
232 | static void | |
204b560f | 233 | graphite_finalize (bool need_cfg_cleanup_p) |
f8bf9252 | 234 | { |
204b560f | 235 | if (need_cfg_cleanup_p) |
8e88f9fd | 236 | { |
fd4a56ff | 237 | scev_reset (); |
8e88f9fd | 238 | cleanup_tree_cfg (); |
0a6a6ac9 | 239 | profile_status_for_fn (cfun) = PROFILE_ABSENT; |
8e88f9fd SP |
240 | release_recorded_exits (); |
241 | tree_estimate_probability (); | |
242 | } | |
f8bf9252 | 243 | |
204b560f | 244 | free_original_copy_tables (); |
a61e3d2a | 245 | |
204b560f SP |
246 | if (dump_file && dump_flags) |
247 | print_loops (dump_file, 3); | |
f8bf9252 SP |
248 | } |
249 | ||
33ad93b9 RG |
250 | isl_ctx *the_isl_ctx; |
251 | ||
f8bf9252 SP |
252 | /* Perform a set of linear transforms on the loops of the current |
253 | function. */ | |
254 | ||
255 | void | |
256 | graphite_transform_loops (void) | |
257 | { | |
258 | int i; | |
259 | scop_p scop; | |
204b560f | 260 | bool need_cfg_cleanup_p = false; |
6e1aa848 | 261 | vec<scop_p> scops = vNULL; |
33ad93b9 | 262 | isl_ctx *ctx; |
f8bf9252 | 263 | |
62e0a1ed RG |
264 | /* If a function is parallel it was most probably already run through graphite |
265 | once. No need to run again. */ | |
266 | if (parallelized_function_p (cfun->decl)) | |
267 | return; | |
268 | ||
33ad93b9 | 269 | ctx = isl_ctx_alloc (); |
c3284718 | 270 | isl_options_set_on_error (ctx, ISL_ON_ERROR_ABORT); |
33ad93b9 | 271 | if (!graphite_initialize (ctx)) |
f8bf9252 SP |
272 | return; |
273 | ||
33ad93b9 | 274 | the_isl_ctx = ctx; |
204b560f | 275 | build_scops (&scops); |
f8bf9252 SP |
276 | |
277 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
f8bf9252 | 278 | { |
204b560f SP |
279 | print_graphite_statistics (dump_file, scops); |
280 | print_global_statistics (dump_file); | |
281 | } | |
0b040072 | 282 | |
9771b263 | 283 | FOR_EACH_VEC_ELT (scops, i, scop) |
6a7441f5 SP |
284 | if (dbg_cnt (graphite_scop)) |
285 | { | |
33ad93b9 | 286 | scop->ctx = ctx; |
efa21390 | 287 | build_poly_scop (scop); |
f8bf9252 | 288 | |
eae1a5d4 RG |
289 | if (POLY_SCOP_P (scop) |
290 | && apply_poly_transforms (scop) | |
291 | && graphite_regenerate_ast_isl (scop)) | |
292 | need_cfg_cleanup_p = true; | |
eae1a5d4 | 293 | |
efa21390 | 294 | } |
f8bf9252 | 295 | |
204b560f SP |
296 | free_scops (scops); |
297 | graphite_finalize (need_cfg_cleanup_p); | |
33ad93b9 RG |
298 | the_isl_ctx = NULL; |
299 | isl_ctx_free (ctx); | |
f8bf9252 SP |
300 | } |
301 | ||
eae1a5d4 | 302 | #else /* If ISL is not available: #ifndef HAVE_isl. */ |
f8bf9252 | 303 | |
c1bf2a39 | 304 | static void |
f8bf9252 SP |
305 | graphite_transform_loops (void) |
306 | { | |
eae1a5d4 | 307 | sorry ("Graphite loop optimizations cannot be used (ISL is not available)."); |
f8bf9252 SP |
308 | } |
309 | ||
310 | #endif | |
c1bf2a39 AM |
311 | |
312 | ||
313 | static unsigned int | |
726338f4 | 314 | graphite_transforms (struct function *fun) |
c1bf2a39 | 315 | { |
726338f4 | 316 | if (number_of_loops (fun) <= 1) |
c1bf2a39 AM |
317 | return 0; |
318 | ||
319 | graphite_transform_loops (); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | static bool | |
325 | gate_graphite_transforms (void) | |
326 | { | |
327 | /* Enable -fgraphite pass if any one of the graphite optimization flags | |
328 | is turned on. */ | |
329 | if (flag_loop_block | |
330 | || flag_loop_interchange | |
331 | || flag_loop_strip_mine | |
332 | || flag_graphite_identity | |
333 | || flag_loop_parallelize_all | |
20d3465b MN |
334 | || flag_loop_optimize_isl |
335 | || flag_loop_unroll_jam) | |
c1bf2a39 AM |
336 | flag_graphite = 1; |
337 | ||
338 | return flag_graphite != 0; | |
339 | } | |
340 | ||
63ab94b6 | 341 | static const pass_data pass_data_graphite = |
c1bf2a39 AM |
342 | { |
343 | GIMPLE_PASS, /* type */ | |
344 | "graphite0", /* name */ | |
345 | OPTGROUP_LOOP, /* optinfo_flags */ | |
c1bf2a39 AM |
346 | TV_GRAPHITE, /* tv_id */ |
347 | ( PROP_cfg | PROP_ssa ), /* properties_required */ | |
348 | 0, /* properties_provided */ | |
349 | 0, /* properties_destroyed */ | |
350 | 0, /* todo_flags_start */ | |
351 | 0, /* todo_flags_finish */ | |
352 | }; | |
353 | ||
63ab94b6 | 354 | class pass_graphite GCC_FINAL : public gimple_opt_pass |
c1bf2a39 AM |
355 | { |
356 | public: | |
357 | pass_graphite (gcc::context *ctxt) | |
358 | : gimple_opt_pass (pass_data_graphite, ctxt) | |
359 | {} | |
360 | ||
361 | /* opt_pass methods: */ | |
1a3d085c | 362 | virtual bool gate (function *) { return gate_graphite_transforms (); } |
c1bf2a39 AM |
363 | |
364 | }; // class pass_graphite | |
365 | ||
c1bf2a39 AM |
366 | gimple_opt_pass * |
367 | make_pass_graphite (gcc::context *ctxt) | |
368 | { | |
369 | return new pass_graphite (ctxt); | |
370 | } | |
371 | ||
63ab94b6 | 372 | static const pass_data pass_data_graphite_transforms = |
c1bf2a39 AM |
373 | { |
374 | GIMPLE_PASS, /* type */ | |
375 | "graphite", /* name */ | |
376 | OPTGROUP_LOOP, /* optinfo_flags */ | |
c1bf2a39 AM |
377 | TV_GRAPHITE_TRANSFORMS, /* tv_id */ |
378 | ( PROP_cfg | PROP_ssa ), /* properties_required */ | |
379 | 0, /* properties_provided */ | |
380 | 0, /* properties_destroyed */ | |
381 | 0, /* todo_flags_start */ | |
382 | 0, /* todo_flags_finish */ | |
383 | }; | |
384 | ||
63ab94b6 | 385 | class pass_graphite_transforms GCC_FINAL : public gimple_opt_pass |
c1bf2a39 AM |
386 | { |
387 | public: | |
388 | pass_graphite_transforms (gcc::context *ctxt) | |
389 | : gimple_opt_pass (pass_data_graphite_transforms, ctxt) | |
390 | {} | |
391 | ||
392 | /* opt_pass methods: */ | |
1a3d085c | 393 | virtual bool gate (function *) { return gate_graphite_transforms (); } |
726338f4 | 394 | virtual unsigned int execute (function *fun) { return graphite_transforms (fun); } |
c1bf2a39 AM |
395 | |
396 | }; // class pass_graphite_transforms | |
397 | ||
c1bf2a39 AM |
398 | gimple_opt_pass * |
399 | make_pass_graphite_transforms (gcc::context *ctxt) | |
400 | { | |
401 | return new pass_graphite_transforms (ctxt); | |
402 | } | |
403 | ||
404 |