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56cf8686 | 1 | /* Data references and dependences detectors. |
818ab71a | 2 | Copyright (C) 2003-2016 Free Software Foundation, Inc. |
0ff4040e | 3 | Contributed by Sebastian Pop <pop@cri.ensmp.fr> |
56cf8686 SP |
4 | |
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 9 | Software Foundation; either version 3, or (at your option) any later |
56cf8686 SP |
10 | version. |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
56cf8686 SP |
20 | |
21 | /* This pass walks a given loop structure searching for array | |
22 | references. The information about the array accesses is recorded | |
b8698a0f L |
23 | in DATA_REFERENCE structures. |
24 | ||
25 | The basic test for determining the dependences is: | |
26 | given two access functions chrec1 and chrec2 to a same array, and | |
27 | x and y two vectors from the iteration domain, the same element of | |
56cf8686 SP |
28 | the array is accessed twice at iterations x and y if and only if: |
29 | | chrec1 (x) == chrec2 (y). | |
b8698a0f | 30 | |
56cf8686 | 31 | The goals of this analysis are: |
b8698a0f | 32 | |
56cf8686 SP |
33 | - to determine the independence: the relation between two |
34 | independent accesses is qualified with the chrec_known (this | |
35 | information allows a loop parallelization), | |
b8698a0f | 36 | |
56cf8686 SP |
37 | - when two data references access the same data, to qualify the |
38 | dependence relation with classic dependence representations: | |
b8698a0f | 39 | |
56cf8686 SP |
40 | - distance vectors |
41 | - direction vectors | |
42 | - loop carried level dependence | |
43 | - polyhedron dependence | |
44 | or with the chains of recurrences based representation, | |
b8698a0f L |
45 | |
46 | - to define a knowledge base for storing the data dependence | |
56cf8686 | 47 | information, |
b8698a0f | 48 | |
56cf8686 | 49 | - to define an interface to access this data. |
b8698a0f L |
50 | |
51 | ||
56cf8686 | 52 | Definitions: |
b8698a0f | 53 | |
56cf8686 SP |
54 | - subscript: given two array accesses a subscript is the tuple |
55 | composed of the access functions for a given dimension. Example: | |
56 | Given A[f1][f2][f3] and B[g1][g2][g3], there are three subscripts: | |
57 | (f1, g1), (f2, g2), (f3, g3). | |
58 | ||
59 | - Diophantine equation: an equation whose coefficients and | |
b8698a0f | 60 | solutions are integer constants, for example the equation |
56cf8686 SP |
61 | | 3*x + 2*y = 1 |
62 | has an integer solution x = 1 and y = -1. | |
b8698a0f | 63 | |
56cf8686 | 64 | References: |
b8698a0f | 65 | |
56cf8686 SP |
66 | - "Advanced Compilation for High Performance Computing" by Randy |
67 | Allen and Ken Kennedy. | |
b8698a0f L |
68 | http://citeseer.ist.psu.edu/goff91practical.html |
69 | ||
70 | - "Loop Transformations for Restructuring Compilers - The Foundations" | |
56cf8686 SP |
71 | by Utpal Banerjee. |
72 | ||
b8698a0f | 73 | |
56cf8686 SP |
74 | */ |
75 | ||
76 | #include "config.h" | |
77 | #include "system.h" | |
78 | #include "coretypes.h" | |
c7131fb2 | 79 | #include "backend.h" |
957060b5 | 80 | #include "rtl.h" |
cf2d1b38 | 81 | #include "tree.h" |
c7131fb2 | 82 | #include "gimple.h" |
957060b5 AM |
83 | #include "gimple-pretty-print.h" |
84 | #include "alias.h" | |
c7131fb2 | 85 | #include "fold-const.h" |
36566b39 | 86 | #include "expr.h" |
5be5c238 | 87 | #include "gimple-iterator.h" |
e28030cf | 88 | #include "tree-ssa-loop-niter.h" |
442b4905 | 89 | #include "tree-ssa-loop.h" |
7a300452 | 90 | #include "tree-ssa.h" |
56cf8686 | 91 | #include "cfgloop.h" |
56cf8686 SP |
92 | #include "tree-data-ref.h" |
93 | #include "tree-scalar-evolution.h" | |
7ee2468b | 94 | #include "dumpfile.h" |
02f5d6c5 | 95 | #include "tree-affine.h" |
3881dee9 | 96 | #include "params.h" |
56cf8686 | 97 | |
0ff4040e SP |
98 | static struct datadep_stats |
99 | { | |
100 | int num_dependence_tests; | |
101 | int num_dependence_dependent; | |
102 | int num_dependence_independent; | |
103 | int num_dependence_undetermined; | |
104 | ||
105 | int num_subscript_tests; | |
106 | int num_subscript_undetermined; | |
107 | int num_same_subscript_function; | |
108 | ||
109 | int num_ziv; | |
110 | int num_ziv_independent; | |
111 | int num_ziv_dependent; | |
112 | int num_ziv_unimplemented; | |
113 | ||
114 | int num_siv; | |
115 | int num_siv_independent; | |
116 | int num_siv_dependent; | |
117 | int num_siv_unimplemented; | |
118 | ||
119 | int num_miv; | |
120 | int num_miv_independent; | |
121 | int num_miv_dependent; | |
122 | int num_miv_unimplemented; | |
123 | } dependence_stats; | |
124 | ||
ba42e045 SP |
125 | static bool subscript_dependence_tester_1 (struct data_dependence_relation *, |
126 | struct data_reference *, | |
da9a21f4 SP |
127 | struct data_reference *, |
128 | struct loop *); | |
56cf8686 SP |
129 | /* Returns true iff A divides B. */ |
130 | ||
b8698a0f | 131 | static inline bool |
ed7a4b4b | 132 | tree_fold_divides_p (const_tree a, const_tree b) |
56cf8686 | 133 | { |
b73a6056 RS |
134 | gcc_assert (TREE_CODE (a) == INTEGER_CST); |
135 | gcc_assert (TREE_CODE (b) == INTEGER_CST); | |
d35936ab | 136 | return integer_zerop (int_const_binop (TRUNC_MOD_EXPR, b, a)); |
56cf8686 SP |
137 | } |
138 | ||
86df10e3 SP |
139 | /* Returns true iff A divides B. */ |
140 | ||
b8698a0f | 141 | static inline bool |
86df10e3 SP |
142 | int_divides_p (int a, int b) |
143 | { | |
144 | return ((b % a) == 0); | |
56cf8686 SP |
145 | } |
146 | ||
147 | \f | |
148 | ||
b8698a0f | 149 | /* Dump into FILE all the data references from DATAREFS. */ |
56cf8686 | 150 | |
aeb83f09 | 151 | static void |
9771b263 | 152 | dump_data_references (FILE *file, vec<data_reference_p> datarefs) |
56cf8686 SP |
153 | { |
154 | unsigned int i; | |
ebf78a47 SP |
155 | struct data_reference *dr; |
156 | ||
9771b263 | 157 | FOR_EACH_VEC_ELT (datarefs, i, dr) |
ebf78a47 | 158 | dump_data_reference (file, dr); |
56cf8686 SP |
159 | } |
160 | ||
7b3b6ae4 LC |
161 | /* Unified dump into FILE all the data references from DATAREFS. */ |
162 | ||
163 | DEBUG_FUNCTION void | |
164 | debug (vec<data_reference_p> &ref) | |
165 | { | |
166 | dump_data_references (stderr, ref); | |
167 | } | |
168 | ||
169 | DEBUG_FUNCTION void | |
170 | debug (vec<data_reference_p> *ptr) | |
171 | { | |
172 | if (ptr) | |
173 | debug (*ptr); | |
174 | else | |
175 | fprintf (stderr, "<nil>\n"); | |
176 | } | |
177 | ||
178 | ||
b8698a0f | 179 | /* Dump into STDERR all the data references from DATAREFS. */ |
a37d995a | 180 | |
24e47c76 | 181 | DEBUG_FUNCTION void |
9771b263 | 182 | debug_data_references (vec<data_reference_p> datarefs) |
a37d995a SP |
183 | { |
184 | dump_data_references (stderr, datarefs); | |
185 | } | |
186 | ||
a37d995a SP |
187 | /* Print to STDERR the data_reference DR. */ |
188 | ||
24e47c76 | 189 | DEBUG_FUNCTION void |
a37d995a SP |
190 | debug_data_reference (struct data_reference *dr) |
191 | { | |
192 | dump_data_reference (stderr, dr); | |
193 | } | |
194 | ||
56cf8686 SP |
195 | /* Dump function for a DATA_REFERENCE structure. */ |
196 | ||
b8698a0f L |
197 | void |
198 | dump_data_reference (FILE *outf, | |
56cf8686 SP |
199 | struct data_reference *dr) |
200 | { | |
201 | unsigned int i; | |
b8698a0f | 202 | |
28c5db57 SP |
203 | fprintf (outf, "#(Data Ref: \n"); |
204 | fprintf (outf, "# bb: %d \n", gimple_bb (DR_STMT (dr))->index); | |
205 | fprintf (outf, "# stmt: "); | |
726a989a | 206 | print_gimple_stmt (outf, DR_STMT (dr), 0, 0); |
03922af3 | 207 | fprintf (outf, "# ref: "); |
56cf8686 | 208 | print_generic_stmt (outf, DR_REF (dr), 0); |
03922af3 | 209 | fprintf (outf, "# base_object: "); |
86a07404 | 210 | print_generic_stmt (outf, DR_BASE_OBJECT (dr), 0); |
b8698a0f | 211 | |
56cf8686 SP |
212 | for (i = 0; i < DR_NUM_DIMENSIONS (dr); i++) |
213 | { | |
03922af3 | 214 | fprintf (outf, "# Access function %d: ", i); |
56cf8686 SP |
215 | print_generic_stmt (outf, DR_ACCESS_FN (dr, i), 0); |
216 | } | |
03922af3 | 217 | fprintf (outf, "#)\n"); |
56cf8686 SP |
218 | } |
219 | ||
7b3b6ae4 LC |
220 | /* Unified dump function for a DATA_REFERENCE structure. */ |
221 | ||
222 | DEBUG_FUNCTION void | |
223 | debug (data_reference &ref) | |
224 | { | |
225 | dump_data_reference (stderr, &ref); | |
226 | } | |
227 | ||
228 | DEBUG_FUNCTION void | |
229 | debug (data_reference *ptr) | |
230 | { | |
231 | if (ptr) | |
232 | debug (*ptr); | |
233 | else | |
234 | fprintf (stderr, "<nil>\n"); | |
235 | } | |
236 | ||
237 | ||
d93817c4 ZD |
238 | /* Dumps the affine function described by FN to the file OUTF. */ |
239 | ||
49b8fe6c | 240 | DEBUG_FUNCTION void |
d93817c4 ZD |
241 | dump_affine_function (FILE *outf, affine_fn fn) |
242 | { | |
243 | unsigned i; | |
244 | tree coef; | |
245 | ||
9771b263 DN |
246 | print_generic_expr (outf, fn[0], TDF_SLIM); |
247 | for (i = 1; fn.iterate (i, &coef); i++) | |
d93817c4 ZD |
248 | { |
249 | fprintf (outf, " + "); | |
250 | print_generic_expr (outf, coef, TDF_SLIM); | |
251 | fprintf (outf, " * x_%u", i); | |
252 | } | |
253 | } | |
254 | ||
255 | /* Dumps the conflict function CF to the file OUTF. */ | |
256 | ||
49b8fe6c | 257 | DEBUG_FUNCTION void |
d93817c4 ZD |
258 | dump_conflict_function (FILE *outf, conflict_function *cf) |
259 | { | |
260 | unsigned i; | |
261 | ||
262 | if (cf->n == NO_DEPENDENCE) | |
bcf1ef00 | 263 | fprintf (outf, "no dependence"); |
d93817c4 | 264 | else if (cf->n == NOT_KNOWN) |
bcf1ef00 | 265 | fprintf (outf, "not known"); |
d93817c4 ZD |
266 | else |
267 | { | |
268 | for (i = 0; i < cf->n; i++) | |
269 | { | |
bcf1ef00 RB |
270 | if (i != 0) |
271 | fprintf (outf, " "); | |
d93817c4 ZD |
272 | fprintf (outf, "["); |
273 | dump_affine_function (outf, cf->fns[i]); | |
bcf1ef00 | 274 | fprintf (outf, "]"); |
d93817c4 ZD |
275 | } |
276 | } | |
277 | } | |
278 | ||
86df10e3 SP |
279 | /* Dump function for a SUBSCRIPT structure. */ |
280 | ||
49b8fe6c | 281 | DEBUG_FUNCTION void |
86df10e3 SP |
282 | dump_subscript (FILE *outf, struct subscript *subscript) |
283 | { | |
d93817c4 | 284 | conflict_function *cf = SUB_CONFLICTS_IN_A (subscript); |
86df10e3 SP |
285 | |
286 | fprintf (outf, "\n (subscript \n"); | |
287 | fprintf (outf, " iterations_that_access_an_element_twice_in_A: "); | |
d93817c4 ZD |
288 | dump_conflict_function (outf, cf); |
289 | if (CF_NONTRIVIAL_P (cf)) | |
86df10e3 SP |
290 | { |
291 | tree last_iteration = SUB_LAST_CONFLICT (subscript); | |
bcf1ef00 RB |
292 | fprintf (outf, "\n last_conflict: "); |
293 | print_generic_expr (outf, last_iteration, 0); | |
86df10e3 | 294 | } |
b8698a0f | 295 | |
d93817c4 | 296 | cf = SUB_CONFLICTS_IN_B (subscript); |
bcf1ef00 | 297 | fprintf (outf, "\n iterations_that_access_an_element_twice_in_B: "); |
d93817c4 ZD |
298 | dump_conflict_function (outf, cf); |
299 | if (CF_NONTRIVIAL_P (cf)) | |
86df10e3 SP |
300 | { |
301 | tree last_iteration = SUB_LAST_CONFLICT (subscript); | |
bcf1ef00 RB |
302 | fprintf (outf, "\n last_conflict: "); |
303 | print_generic_expr (outf, last_iteration, 0); | |
86df10e3 SP |
304 | } |
305 | ||
bcf1ef00 RB |
306 | fprintf (outf, "\n (Subscript distance: "); |
307 | print_generic_expr (outf, SUB_DISTANCE (subscript), 0); | |
308 | fprintf (outf, " ))\n"); | |
86df10e3 SP |
309 | } |
310 | ||
0ff4040e SP |
311 | /* Print the classic direction vector DIRV to OUTF. */ |
312 | ||
49b8fe6c | 313 | DEBUG_FUNCTION void |
0ff4040e SP |
314 | print_direction_vector (FILE *outf, |
315 | lambda_vector dirv, | |
316 | int length) | |
317 | { | |
318 | int eq; | |
319 | ||
320 | for (eq = 0; eq < length; eq++) | |
321 | { | |
81f40b79 ILT |
322 | enum data_dependence_direction dir = ((enum data_dependence_direction) |
323 | dirv[eq]); | |
0ff4040e SP |
324 | |
325 | switch (dir) | |
326 | { | |
327 | case dir_positive: | |
328 | fprintf (outf, " +"); | |
329 | break; | |
330 | case dir_negative: | |
331 | fprintf (outf, " -"); | |
332 | break; | |
333 | case dir_equal: | |
334 | fprintf (outf, " ="); | |
335 | break; | |
336 | case dir_positive_or_equal: | |
337 | fprintf (outf, " +="); | |
338 | break; | |
339 | case dir_positive_or_negative: | |
340 | fprintf (outf, " +-"); | |
341 | break; | |
342 | case dir_negative_or_equal: | |
343 | fprintf (outf, " -="); | |
344 | break; | |
345 | case dir_star: | |
346 | fprintf (outf, " *"); | |
347 | break; | |
348 | default: | |
349 | fprintf (outf, "indep"); | |
350 | break; | |
351 | } | |
352 | } | |
353 | fprintf (outf, "\n"); | |
354 | } | |
355 | ||
ba42e045 SP |
356 | /* Print a vector of direction vectors. */ |
357 | ||
49b8fe6c | 358 | DEBUG_FUNCTION void |
9771b263 | 359 | print_dir_vectors (FILE *outf, vec<lambda_vector> dir_vects, |
ba42e045 SP |
360 | int length) |
361 | { | |
362 | unsigned j; | |
363 | lambda_vector v; | |
364 | ||
9771b263 | 365 | FOR_EACH_VEC_ELT (dir_vects, j, v) |
ba42e045 SP |
366 | print_direction_vector (outf, v, length); |
367 | } | |
368 | ||
b305e3da SP |
369 | /* Print out a vector VEC of length N to OUTFILE. */ |
370 | ||
49b8fe6c | 371 | DEBUG_FUNCTION void |
b305e3da SP |
372 | print_lambda_vector (FILE * outfile, lambda_vector vector, int n) |
373 | { | |
374 | int i; | |
375 | ||
376 | for (i = 0; i < n; i++) | |
377 | fprintf (outfile, "%3d ", vector[i]); | |
378 | fprintf (outfile, "\n"); | |
379 | } | |
380 | ||
ba42e045 SP |
381 | /* Print a vector of distance vectors. */ |
382 | ||
49b8fe6c | 383 | DEBUG_FUNCTION void |
9771b263 | 384 | print_dist_vectors (FILE *outf, vec<lambda_vector> dist_vects, |
aeb83f09 | 385 | int length) |
ba42e045 SP |
386 | { |
387 | unsigned j; | |
388 | lambda_vector v; | |
389 | ||
9771b263 | 390 | FOR_EACH_VEC_ELT (dist_vects, j, v) |
ba42e045 SP |
391 | print_lambda_vector (outf, v, length); |
392 | } | |
393 | ||
56cf8686 SP |
394 | /* Dump function for a DATA_DEPENDENCE_RELATION structure. */ |
395 | ||
49b8fe6c | 396 | DEBUG_FUNCTION void |
b8698a0f | 397 | dump_data_dependence_relation (FILE *outf, |
56cf8686 SP |
398 | struct data_dependence_relation *ddr) |
399 | { | |
56cf8686 | 400 | struct data_reference *dra, *drb; |
86df10e3 | 401 | |
86df10e3 | 402 | fprintf (outf, "(Data Dep: \n"); |
dea61d92 | 403 | |
ed2024ba MJ |
404 | if (!ddr || DDR_ARE_DEPENDENT (ddr) == chrec_dont_know) |
405 | { | |
b61b1f17 MM |
406 | if (ddr) |
407 | { | |
408 | dra = DDR_A (ddr); | |
409 | drb = DDR_B (ddr); | |
410 | if (dra) | |
411 | dump_data_reference (outf, dra); | |
412 | else | |
413 | fprintf (outf, " (nil)\n"); | |
414 | if (drb) | |
415 | dump_data_reference (outf, drb); | |
416 | else | |
417 | fprintf (outf, " (nil)\n"); | |
418 | } | |
ed2024ba MJ |
419 | fprintf (outf, " (don't know)\n)\n"); |
420 | return; | |
421 | } | |
422 | ||
423 | dra = DDR_A (ddr); | |
424 | drb = DDR_B (ddr); | |
dea61d92 SP |
425 | dump_data_reference (outf, dra); |
426 | dump_data_reference (outf, drb); | |
427 | ||
ed2024ba | 428 | if (DDR_ARE_DEPENDENT (ddr) == chrec_known) |
56cf8686 | 429 | fprintf (outf, " (no dependence)\n"); |
b8698a0f | 430 | |
86df10e3 | 431 | else if (DDR_ARE_DEPENDENT (ddr) == NULL_TREE) |
56cf8686 | 432 | { |
86df10e3 | 433 | unsigned int i; |
ba42e045 | 434 | struct loop *loopi; |
304afda6 | 435 | |
56cf8686 SP |
436 | for (i = 0; i < DDR_NUM_SUBSCRIPTS (ddr); i++) |
437 | { | |
56cf8686 SP |
438 | fprintf (outf, " access_fn_A: "); |
439 | print_generic_stmt (outf, DR_ACCESS_FN (dra, i), 0); | |
440 | fprintf (outf, " access_fn_B: "); | |
441 | print_generic_stmt (outf, DR_ACCESS_FN (drb, i), 0); | |
86df10e3 | 442 | dump_subscript (outf, DDR_SUBSCRIPT (ddr, i)); |
56cf8686 | 443 | } |
304afda6 | 444 | |
3d8864c0 | 445 | fprintf (outf, " inner loop index: %d\n", DDR_INNER_LOOP (ddr)); |
ba42e045 | 446 | fprintf (outf, " loop nest: ("); |
9771b263 | 447 | FOR_EACH_VEC_ELT (DDR_LOOP_NEST (ddr), i, loopi) |
ba42e045 SP |
448 | fprintf (outf, "%d ", loopi->num); |
449 | fprintf (outf, ")\n"); | |
450 | ||
304afda6 | 451 | for (i = 0; i < DDR_NUM_DIST_VECTS (ddr); i++) |
56cf8686 | 452 | { |
304afda6 SP |
453 | fprintf (outf, " distance_vector: "); |
454 | print_lambda_vector (outf, DDR_DIST_VECT (ddr, i), | |
ba42e045 | 455 | DDR_NB_LOOPS (ddr)); |
86df10e3 | 456 | } |
304afda6 SP |
457 | |
458 | for (i = 0; i < DDR_NUM_DIR_VECTS (ddr); i++) | |
86df10e3 | 459 | { |
304afda6 | 460 | fprintf (outf, " direction_vector: "); |
0ff4040e | 461 | print_direction_vector (outf, DDR_DIR_VECT (ddr, i), |
ba42e045 | 462 | DDR_NB_LOOPS (ddr)); |
56cf8686 | 463 | } |
56cf8686 SP |
464 | } |
465 | ||
466 | fprintf (outf, ")\n"); | |
467 | } | |
468 | ||
aeb83f09 | 469 | /* Debug version. */ |
56cf8686 | 470 | |
aeb83f09 RG |
471 | DEBUG_FUNCTION void |
472 | debug_data_dependence_relation (struct data_dependence_relation *ddr) | |
56cf8686 | 473 | { |
aeb83f09 RG |
474 | dump_data_dependence_relation (stderr, ddr); |
475 | } | |
b8698a0f | 476 | |
aeb83f09 | 477 | /* Dump into FILE all the dependence relations from DDRS. */ |
b8698a0f | 478 | |
49b8fe6c | 479 | DEBUG_FUNCTION void |
aeb83f09 | 480 | dump_data_dependence_relations (FILE *file, |
9771b263 | 481 | vec<ddr_p> ddrs) |
aeb83f09 RG |
482 | { |
483 | unsigned int i; | |
484 | struct data_dependence_relation *ddr; | |
b8698a0f | 485 | |
9771b263 | 486 | FOR_EACH_VEC_ELT (ddrs, i, ddr) |
aeb83f09 RG |
487 | dump_data_dependence_relation (file, ddr); |
488 | } | |
b8698a0f | 489 | |
7b3b6ae4 LC |
490 | DEBUG_FUNCTION void |
491 | debug (vec<ddr_p> &ref) | |
492 | { | |
493 | dump_data_dependence_relations (stderr, ref); | |
494 | } | |
495 | ||
496 | DEBUG_FUNCTION void | |
497 | debug (vec<ddr_p> *ptr) | |
498 | { | |
499 | if (ptr) | |
500 | debug (*ptr); | |
501 | else | |
502 | fprintf (stderr, "<nil>\n"); | |
503 | } | |
504 | ||
505 | ||
aeb83f09 | 506 | /* Dump to STDERR all the dependence relations from DDRS. */ |
b8698a0f | 507 | |
aeb83f09 | 508 | DEBUG_FUNCTION void |
9771b263 | 509 | debug_data_dependence_relations (vec<ddr_p> ddrs) |
aeb83f09 RG |
510 | { |
511 | dump_data_dependence_relations (stderr, ddrs); | |
56cf8686 SP |
512 | } |
513 | ||
86df10e3 SP |
514 | /* Dumps the distance and direction vectors in FILE. DDRS contains |
515 | the dependence relations, and VECT_SIZE is the size of the | |
516 | dependence vectors, or in other words the number of loops in the | |
517 | considered nest. */ | |
518 | ||
49b8fe6c | 519 | DEBUG_FUNCTION void |
9771b263 | 520 | dump_dist_dir_vectors (FILE *file, vec<ddr_p> ddrs) |
86df10e3 | 521 | { |
304afda6 | 522 | unsigned int i, j; |
ebf78a47 SP |
523 | struct data_dependence_relation *ddr; |
524 | lambda_vector v; | |
86df10e3 | 525 | |
9771b263 | 526 | FOR_EACH_VEC_ELT (ddrs, i, ddr) |
ebf78a47 SP |
527 | if (DDR_ARE_DEPENDENT (ddr) == NULL_TREE && DDR_AFFINE_P (ddr)) |
528 | { | |
9771b263 | 529 | FOR_EACH_VEC_ELT (DDR_DIST_VECTS (ddr), j, v) |
ebf78a47 SP |
530 | { |
531 | fprintf (file, "DISTANCE_V ("); | |
532 | print_lambda_vector (file, v, DDR_NB_LOOPS (ddr)); | |
533 | fprintf (file, ")\n"); | |
534 | } | |
535 | ||
9771b263 | 536 | FOR_EACH_VEC_ELT (DDR_DIR_VECTS (ddr), j, v) |
ebf78a47 SP |
537 | { |
538 | fprintf (file, "DIRECTION_V ("); | |
539 | print_direction_vector (file, v, DDR_NB_LOOPS (ddr)); | |
540 | fprintf (file, ")\n"); | |
541 | } | |
542 | } | |
304afda6 | 543 | |
86df10e3 SP |
544 | fprintf (file, "\n\n"); |
545 | } | |
546 | ||
547 | /* Dumps the data dependence relations DDRS in FILE. */ | |
548 | ||
49b8fe6c | 549 | DEBUG_FUNCTION void |
9771b263 | 550 | dump_ddrs (FILE *file, vec<ddr_p> ddrs) |
86df10e3 SP |
551 | { |
552 | unsigned int i; | |
ebf78a47 SP |
553 | struct data_dependence_relation *ddr; |
554 | ||
9771b263 | 555 | FOR_EACH_VEC_ELT (ddrs, i, ddr) |
ebf78a47 | 556 | dump_data_dependence_relation (file, ddr); |
86df10e3 | 557 | |
86df10e3 SP |
558 | fprintf (file, "\n\n"); |
559 | } | |
560 | ||
aeb83f09 | 561 | DEBUG_FUNCTION void |
9771b263 | 562 | debug_ddrs (vec<ddr_p> ddrs) |
aeb83f09 RG |
563 | { |
564 | dump_ddrs (stderr, ddrs); | |
565 | } | |
566 | ||
726a989a RB |
567 | /* Helper function for split_constant_offset. Expresses OP0 CODE OP1 |
568 | (the type of the result is TYPE) as VAR + OFF, where OFF is a nonzero | |
569 | constant of type ssizetype, and returns true. If we cannot do this | |
570 | with OFF nonzero, OFF and VAR are set to NULL_TREE instead and false | |
571 | is returned. */ | |
86a07404 | 572 | |
726a989a RB |
573 | static bool |
574 | split_constant_offset_1 (tree type, tree op0, enum tree_code code, tree op1, | |
575 | tree *var, tree *off) | |
86a07404 | 576 | { |
3cb960c7 ZD |
577 | tree var0, var1; |
578 | tree off0, off1; | |
726a989a | 579 | enum tree_code ocode = code; |
86a07404 | 580 | |
726a989a RB |
581 | *var = NULL_TREE; |
582 | *off = NULL_TREE; | |
86a07404 | 583 | |
5be014d5 | 584 | switch (code) |
86a07404 | 585 | { |
3cb960c7 ZD |
586 | case INTEGER_CST: |
587 | *var = build_int_cst (type, 0); | |
726a989a RB |
588 | *off = fold_convert (ssizetype, op0); |
589 | return true; | |
86a07404 | 590 | |
5be014d5 | 591 | case POINTER_PLUS_EXPR: |
726a989a | 592 | ocode = PLUS_EXPR; |
5be014d5 | 593 | /* FALLTHROUGH */ |
3cb960c7 ZD |
594 | case PLUS_EXPR: |
595 | case MINUS_EXPR: | |
726a989a RB |
596 | split_constant_offset (op0, &var0, &off0); |
597 | split_constant_offset (op1, &var1, &off1); | |
598 | *var = fold_build2 (code, type, var0, var1); | |
599 | *off = size_binop (ocode, off0, off1); | |
600 | return true; | |
86a07404 | 601 | |
86a07404 | 602 | case MULT_EXPR: |
726a989a RB |
603 | if (TREE_CODE (op1) != INTEGER_CST) |
604 | return false; | |
3cb960c7 | 605 | |
726a989a RB |
606 | split_constant_offset (op0, &var0, &off0); |
607 | *var = fold_build2 (MULT_EXPR, type, var0, op1); | |
608 | *off = size_binop (MULT_EXPR, off0, fold_convert (ssizetype, op1)); | |
609 | return true; | |
86a07404 | 610 | |
3cb960c7 ZD |
611 | case ADDR_EXPR: |
612 | { | |
726a989a | 613 | tree base, poffset; |
3cb960c7 | 614 | HOST_WIDE_INT pbitsize, pbitpos; |
ef4bddc2 | 615 | machine_mode pmode; |
ee45a32d | 616 | int punsignedp, preversep, pvolatilep; |
86a07404 | 617 | |
da4b6efc | 618 | op0 = TREE_OPERAND (op0, 0); |
ee45a32d EB |
619 | base |
620 | = get_inner_reference (op0, &pbitsize, &pbitpos, &poffset, &pmode, | |
25b75a48 | 621 | &punsignedp, &preversep, &pvolatilep); |
86a07404 | 622 | |
3cb960c7 | 623 | if (pbitpos % BITS_PER_UNIT != 0) |
726a989a | 624 | return false; |
3cb960c7 ZD |
625 | base = build_fold_addr_expr (base); |
626 | off0 = ssize_int (pbitpos / BITS_PER_UNIT); | |
86a07404 | 627 | |
3cb960c7 ZD |
628 | if (poffset) |
629 | { | |
630 | split_constant_offset (poffset, &poffset, &off1); | |
631 | off0 = size_binop (PLUS_EXPR, off0, off1); | |
36ad7922 | 632 | if (POINTER_TYPE_P (TREE_TYPE (base))) |
5d49b6a7 | 633 | base = fold_build_pointer_plus (base, poffset); |
36ad7922 JJ |
634 | else |
635 | base = fold_build2 (PLUS_EXPR, TREE_TYPE (base), base, | |
636 | fold_convert (TREE_TYPE (base), poffset)); | |
3cb960c7 ZD |
637 | } |
638 | ||
6481b879 JJ |
639 | var0 = fold_convert (type, base); |
640 | ||
641 | /* If variable length types are involved, punt, otherwise casts | |
642 | might be converted into ARRAY_REFs in gimplify_conversion. | |
643 | To compute that ARRAY_REF's element size TYPE_SIZE_UNIT, which | |
644 | possibly no longer appears in current GIMPLE, might resurface. | |
645 | This perhaps could run | |
1a87cf0c | 646 | if (CONVERT_EXPR_P (var0)) |
6481b879 JJ |
647 | { |
648 | gimplify_conversion (&var0); | |
649 | // Attempt to fill in any within var0 found ARRAY_REF's | |
650 | // element size from corresponding op embedded ARRAY_REF, | |
651 | // if unsuccessful, just punt. | |
652 | } */ | |
653 | while (POINTER_TYPE_P (type)) | |
654 | type = TREE_TYPE (type); | |
655 | if (int_size_in_bytes (type) < 0) | |
726a989a | 656 | return false; |
6481b879 JJ |
657 | |
658 | *var = var0; | |
3cb960c7 | 659 | *off = off0; |
726a989a | 660 | return true; |
3cb960c7 | 661 | } |
86a07404 | 662 | |
06cb4f79 JS |
663 | case SSA_NAME: |
664 | { | |
5721768d RB |
665 | if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (op0)) |
666 | return false; | |
667 | ||
355fe088 | 668 | gimple *def_stmt = SSA_NAME_DEF_STMT (op0); |
726a989a | 669 | enum tree_code subcode; |
06cb4f79 | 670 | |
726a989a RB |
671 | if (gimple_code (def_stmt) != GIMPLE_ASSIGN) |
672 | return false; | |
673 | ||
674 | var0 = gimple_assign_rhs1 (def_stmt); | |
675 | subcode = gimple_assign_rhs_code (def_stmt); | |
676 | var1 = gimple_assign_rhs2 (def_stmt); | |
677 | ||
678 | return split_constant_offset_1 (type, var0, subcode, var1, var, off); | |
06cb4f79 | 679 | } |
b61b1f17 MM |
680 | CASE_CONVERT: |
681 | { | |
682 | /* We must not introduce undefined overflow, and we must not change the value. | |
683 | Hence we're okay if the inner type doesn't overflow to start with | |
684 | (pointer or signed), the outer type also is an integer or pointer | |
685 | and the outer precision is at least as large as the inner. */ | |
686 | tree itype = TREE_TYPE (op0); | |
687 | if ((POINTER_TYPE_P (itype) | |
688 | || (INTEGRAL_TYPE_P (itype) && TYPE_OVERFLOW_UNDEFINED (itype))) | |
689 | && TYPE_PRECISION (type) >= TYPE_PRECISION (itype) | |
690 | && (POINTER_TYPE_P (type) || INTEGRAL_TYPE_P (type))) | |
691 | { | |
692 | split_constant_offset (op0, &var0, off); | |
693 | *var = fold_convert (type, var0); | |
694 | return true; | |
695 | } | |
696 | return false; | |
697 | } | |
06cb4f79 | 698 | |
86a07404 | 699 | default: |
726a989a | 700 | return false; |
86a07404 | 701 | } |
726a989a RB |
702 | } |
703 | ||
704 | /* Expresses EXP as VAR + OFF, where off is a constant. The type of OFF | |
705 | will be ssizetype. */ | |
706 | ||
707 | void | |
708 | split_constant_offset (tree exp, tree *var, tree *off) | |
709 | { | |
710 | tree type = TREE_TYPE (exp), otype, op0, op1, e, o; | |
711 | enum tree_code code; | |
86a07404 | 712 | |
726a989a | 713 | *var = exp; |
3cb960c7 | 714 | *off = ssize_int (0); |
726a989a RB |
715 | STRIP_NOPS (exp); |
716 | ||
ffd78b30 RG |
717 | if (tree_is_chrec (exp) |
718 | || get_gimple_rhs_class (TREE_CODE (exp)) == GIMPLE_TERNARY_RHS) | |
726a989a RB |
719 | return; |
720 | ||
721 | otype = TREE_TYPE (exp); | |
722 | code = TREE_CODE (exp); | |
723 | extract_ops_from_tree (exp, &code, &op0, &op1); | |
724 | if (split_constant_offset_1 (otype, op0, code, op1, &e, &o)) | |
725 | { | |
726 | *var = fold_convert (type, e); | |
727 | *off = o; | |
728 | } | |
86a07404 IR |
729 | } |
730 | ||
3cb960c7 ZD |
731 | /* Returns the address ADDR of an object in a canonical shape (without nop |
732 | casts, and with type of pointer to the object). */ | |
86a07404 IR |
733 | |
734 | static tree | |
3cb960c7 | 735 | canonicalize_base_object_address (tree addr) |
86a07404 | 736 | { |
bbc8a8dc ZD |
737 | tree orig = addr; |
738 | ||
3cb960c7 | 739 | STRIP_NOPS (addr); |
86a07404 | 740 | |
bbc8a8dc ZD |
741 | /* The base address may be obtained by casting from integer, in that case |
742 | keep the cast. */ | |
743 | if (!POINTER_TYPE_P (TREE_TYPE (addr))) | |
744 | return orig; | |
745 | ||
3cb960c7 ZD |
746 | if (TREE_CODE (addr) != ADDR_EXPR) |
747 | return addr; | |
86a07404 | 748 | |
3cb960c7 | 749 | return build_fold_addr_expr (TREE_OPERAND (addr, 0)); |
86a07404 IR |
750 | } |
751 | ||
b8698a0f | 752 | /* Analyzes the behavior of the memory reference DR in the innermost loop or |
4e4452b6 | 753 | basic block that contains it. Returns true if analysis succeed or false |
a70d6342 | 754 | otherwise. */ |
86a07404 | 755 | |
3661e899 | 756 | bool |
4e4452b6 | 757 | dr_analyze_innermost (struct data_reference *dr, struct loop *nest) |
86a07404 | 758 | { |
355fe088 | 759 | gimple *stmt = DR_STMT (dr); |
3cb960c7 ZD |
760 | struct loop *loop = loop_containing_stmt (stmt); |
761 | tree ref = DR_REF (dr); | |
86a07404 | 762 | HOST_WIDE_INT pbitsize, pbitpos; |
3cb960c7 | 763 | tree base, poffset; |
ef4bddc2 | 764 | machine_mode pmode; |
ee45a32d | 765 | int punsignedp, preversep, pvolatilep; |
3cb960c7 ZD |
766 | affine_iv base_iv, offset_iv; |
767 | tree init, dinit, step; | |
a70d6342 | 768 | bool in_loop = (loop && loop->num); |
3cb960c7 ZD |
769 | |
770 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
771 | fprintf (dump_file, "analyze_innermost: "); | |
86a07404 | 772 | |
ee45a32d | 773 | base = get_inner_reference (ref, &pbitsize, &pbitpos, &poffset, &pmode, |
25b75a48 | 774 | &punsignedp, &preversep, &pvolatilep); |
3cb960c7 | 775 | gcc_assert (base != NULL_TREE); |
86a07404 | 776 | |
3cb960c7 | 777 | if (pbitpos % BITS_PER_UNIT != 0) |
86a07404 | 778 | { |
3cb960c7 ZD |
779 | if (dump_file && (dump_flags & TDF_DETAILS)) |
780 | fprintf (dump_file, "failed: bit offset alignment.\n"); | |
3661e899 | 781 | return false; |
3cb960c7 | 782 | } |
86a07404 | 783 | |
ee45a32d EB |
784 | if (preversep) |
785 | { | |
786 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
787 | fprintf (dump_file, "failed: reverse storage order.\n"); | |
788 | return false; | |
789 | } | |
790 | ||
70f34814 RG |
791 | if (TREE_CODE (base) == MEM_REF) |
792 | { | |
793 | if (!integer_zerop (TREE_OPERAND (base, 1))) | |
794 | { | |
807e902e KZ |
795 | offset_int moff = mem_ref_offset (base); |
796 | tree mofft = wide_int_to_tree (sizetype, moff); | |
70f34814 | 797 | if (!poffset) |
673910d7 | 798 | poffset = mofft; |
70f34814 | 799 | else |
673910d7 | 800 | poffset = size_binop (PLUS_EXPR, poffset, mofft); |
70f34814 RG |
801 | } |
802 | base = TREE_OPERAND (base, 0); | |
803 | } | |
804 | else | |
805 | base = build_fold_addr_expr (base); | |
4e4452b6 | 806 | |
a70d6342 | 807 | if (in_loop) |
3cb960c7 | 808 | { |
b8698a0f | 809 | if (!simple_iv (loop, loop_containing_stmt (stmt), base, &base_iv, |
319e6439 | 810 | nest ? true : false)) |
a70d6342 | 811 | { |
4e4452b6 IR |
812 | if (nest) |
813 | { | |
814 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
815 | fprintf (dump_file, "failed: evolution of base is not" | |
816 | " affine.\n"); | |
817 | return false; | |
818 | } | |
819 | else | |
820 | { | |
821 | base_iv.base = base; | |
822 | base_iv.step = ssize_int (0); | |
823 | base_iv.no_overflow = true; | |
824 | } | |
a70d6342 IR |
825 | } |
826 | } | |
827 | else | |
828 | { | |
829 | base_iv.base = base; | |
830 | base_iv.step = ssize_int (0); | |
831 | base_iv.no_overflow = true; | |
3cb960c7 | 832 | } |
a70d6342 | 833 | |
24adb18f | 834 | if (!poffset) |
3cb960c7 ZD |
835 | { |
836 | offset_iv.base = ssize_int (0); | |
837 | offset_iv.step = ssize_int (0); | |
838 | } | |
24adb18f | 839 | else |
3cb960c7 | 840 | { |
24adb18f IR |
841 | if (!in_loop) |
842 | { | |
843 | offset_iv.base = poffset; | |
844 | offset_iv.step = ssize_int (0); | |
845 | } | |
846 | else if (!simple_iv (loop, loop_containing_stmt (stmt), | |
319e6439 RG |
847 | poffset, &offset_iv, |
848 | nest ? true : false)) | |
24adb18f | 849 | { |
4e4452b6 IR |
850 | if (nest) |
851 | { | |
852 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
853 | fprintf (dump_file, "failed: evolution of offset is not" | |
854 | " affine.\n"); | |
855 | return false; | |
856 | } | |
857 | else | |
858 | { | |
859 | offset_iv.base = poffset; | |
860 | offset_iv.step = ssize_int (0); | |
861 | } | |
24adb18f | 862 | } |
3cb960c7 | 863 | } |
86a07404 | 864 | |
3cb960c7 ZD |
865 | init = ssize_int (pbitpos / BITS_PER_UNIT); |
866 | split_constant_offset (base_iv.base, &base_iv.base, &dinit); | |
867 | init = size_binop (PLUS_EXPR, init, dinit); | |
868 | split_constant_offset (offset_iv.base, &offset_iv.base, &dinit); | |
869 | init = size_binop (PLUS_EXPR, init, dinit); | |
86a07404 | 870 | |
3cb960c7 ZD |
871 | step = size_binop (PLUS_EXPR, |
872 | fold_convert (ssizetype, base_iv.step), | |
873 | fold_convert (ssizetype, offset_iv.step)); | |
86a07404 | 874 | |
3cb960c7 | 875 | DR_BASE_ADDRESS (dr) = canonicalize_base_object_address (base_iv.base); |
86a07404 | 876 | |
3cb960c7 ZD |
877 | DR_OFFSET (dr) = fold_convert (ssizetype, offset_iv.base); |
878 | DR_INIT (dr) = init; | |
879 | DR_STEP (dr) = step; | |
86a07404 | 880 | |
3cb960c7 | 881 | DR_ALIGNED_TO (dr) = size_int (highest_pow2_factor (offset_iv.base)); |
86a07404 | 882 | |
3cb960c7 ZD |
883 | if (dump_file && (dump_flags & TDF_DETAILS)) |
884 | fprintf (dump_file, "success.\n"); | |
3661e899 TB |
885 | |
886 | return true; | |
3cb960c7 | 887 | } |
86a07404 | 888 | |
3cb960c7 | 889 | /* Determines the base object and the list of indices of memory reference |
5c640e29 | 890 | DR, analyzed in LOOP and instantiated in loop nest NEST. */ |
86a07404 | 891 | |
3cb960c7 | 892 | static void |
5c640e29 | 893 | dr_analyze_indices (struct data_reference *dr, loop_p nest, loop_p loop) |
3cb960c7 | 894 | { |
6e1aa848 | 895 | vec<tree> access_fns = vNULL; |
c4ddde1b | 896 | tree ref, op; |
9fcb758b RG |
897 | tree base, off, access_fn; |
898 | basic_block before_loop; | |
b8698a0f | 899 | |
9fcb758b RG |
900 | /* If analyzing a basic-block there are no indices to analyze |
901 | and thus no access functions. */ | |
02f5d6c5 RG |
902 | if (!nest) |
903 | { | |
9fcb758b | 904 | DR_BASE_OBJECT (dr) = DR_REF (dr); |
9771b263 | 905 | DR_ACCESS_FNS (dr).create (0); |
02f5d6c5 RG |
906 | return; |
907 | } | |
908 | ||
c4ddde1b | 909 | ref = DR_REF (dr); |
02f5d6c5 | 910 | before_loop = block_before_loop (nest); |
b8698a0f | 911 | |
9fcb758b RG |
912 | /* REALPART_EXPR and IMAGPART_EXPR can be handled like accesses |
913 | into a two element array with a constant index. The base is | |
914 | then just the immediate underlying object. */ | |
915 | if (TREE_CODE (ref) == REALPART_EXPR) | |
916 | { | |
917 | ref = TREE_OPERAND (ref, 0); | |
9771b263 | 918 | access_fns.safe_push (integer_zero_node); |
9fcb758b RG |
919 | } |
920 | else if (TREE_CODE (ref) == IMAGPART_EXPR) | |
921 | { | |
922 | ref = TREE_OPERAND (ref, 0); | |
9771b263 | 923 | access_fns.safe_push (integer_one_node); |
9fcb758b RG |
924 | } |
925 | ||
b8324815 | 926 | /* Analyze access functions of dimensions we know to be independent. */ |
c4ddde1b | 927 | while (handled_component_p (ref)) |
86a07404 | 928 | { |
c4ddde1b | 929 | if (TREE_CODE (ref) == ARRAY_REF) |
86a07404 | 930 | { |
c4ddde1b | 931 | op = TREE_OPERAND (ref, 1); |
02f5d6c5 RG |
932 | access_fn = analyze_scalar_evolution (loop, op); |
933 | access_fn = instantiate_scev (before_loop, loop, access_fn); | |
9771b263 | 934 | access_fns.safe_push (access_fn); |
b8324815 | 935 | } |
c4ddde1b RG |
936 | else if (TREE_CODE (ref) == COMPONENT_REF |
937 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (ref, 0))) == RECORD_TYPE) | |
938 | { | |
939 | /* For COMPONENT_REFs of records (but not unions!) use the | |
940 | FIELD_DECL offset as constant access function so we can | |
941 | disambiguate a[i].f1 and a[i].f2. */ | |
942 | tree off = component_ref_field_offset (ref); | |
943 | off = size_binop (PLUS_EXPR, | |
944 | size_binop (MULT_EXPR, | |
945 | fold_convert (bitsizetype, off), | |
946 | bitsize_int (BITS_PER_UNIT)), | |
947 | DECL_FIELD_BIT_OFFSET (TREE_OPERAND (ref, 1))); | |
9771b263 | 948 | access_fns.safe_push (off); |
c4ddde1b RG |
949 | } |
950 | else | |
951 | /* If we have an unhandled component we could not translate | |
952 | to an access function stop analyzing. We have determined | |
953 | our base object in this case. */ | |
954 | break; | |
b8698a0f | 955 | |
c4ddde1b | 956 | ref = TREE_OPERAND (ref, 0); |
86a07404 IR |
957 | } |
958 | ||
8c330caa RG |
959 | /* If the address operand of a MEM_REF base has an evolution in the |
960 | analyzed nest, add it as an additional independent access-function. */ | |
c4ddde1b | 961 | if (TREE_CODE (ref) == MEM_REF) |
86a07404 | 962 | { |
c4ddde1b | 963 | op = TREE_OPERAND (ref, 0); |
3cb960c7 | 964 | access_fn = analyze_scalar_evolution (loop, op); |
a213b219 | 965 | access_fn = instantiate_scev (before_loop, loop, access_fn); |
8c330caa | 966 | if (TREE_CODE (access_fn) == POLYNOMIAL_CHREC) |
2946bd34 | 967 | { |
0a500dd3 | 968 | tree orig_type; |
c4ddde1b | 969 | tree memoff = TREE_OPERAND (ref, 1); |
8c330caa | 970 | base = initial_condition (access_fn); |
0a500dd3 RG |
971 | orig_type = TREE_TYPE (base); |
972 | STRIP_USELESS_TYPE_CONVERSION (base); | |
8c330caa | 973 | split_constant_offset (base, &base, &off); |
f65586dc | 974 | STRIP_USELESS_TYPE_CONVERSION (base); |
8c330caa RG |
975 | /* Fold the MEM_REF offset into the evolutions initial |
976 | value to make more bases comparable. */ | |
c4ddde1b | 977 | if (!integer_zerop (memoff)) |
8c330caa RG |
978 | { |
979 | off = size_binop (PLUS_EXPR, off, | |
c4ddde1b RG |
980 | fold_convert (ssizetype, memoff)); |
981 | memoff = build_int_cst (TREE_TYPE (memoff), 0); | |
8c330caa | 982 | } |
d679e96b RB |
983 | /* Adjust the offset so it is a multiple of the access type |
984 | size and thus we separate bases that can possibly be used | |
985 | to produce partial overlaps (which the access_fn machinery | |
986 | cannot handle). */ | |
987 | wide_int rem; | |
988 | if (TYPE_SIZE_UNIT (TREE_TYPE (ref)) | |
989 | && TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (ref))) == INTEGER_CST | |
990 | && !integer_zerop (TYPE_SIZE_UNIT (TREE_TYPE (ref)))) | |
991 | rem = wi::mod_trunc (off, TYPE_SIZE_UNIT (TREE_TYPE (ref)), SIGNED); | |
992 | else | |
993 | /* If we can't compute the remainder simply force the initial | |
994 | condition to zero. */ | |
995 | rem = off; | |
996 | off = wide_int_to_tree (ssizetype, wi::sub (off, rem)); | |
997 | memoff = wide_int_to_tree (TREE_TYPE (memoff), rem); | |
998 | /* And finally replace the initial condition. */ | |
8c330caa | 999 | access_fn = chrec_replace_initial_condition |
0a500dd3 | 1000 | (access_fn, fold_convert (orig_type, off)); |
c4ddde1b RG |
1001 | /* ??? This is still not a suitable base object for |
1002 | dr_may_alias_p - the base object needs to be an | |
1003 | access that covers the object as whole. With | |
1004 | an evolution in the pointer this cannot be | |
1005 | guaranteed. | |
1006 | As a band-aid, mark the access so we can special-case | |
1007 | it in dr_may_alias_p. */ | |
f3dccf50 | 1008 | tree old = ref; |
c4ddde1b RG |
1009 | ref = fold_build2_loc (EXPR_LOCATION (ref), |
1010 | MEM_REF, TREE_TYPE (ref), | |
1011 | base, memoff); | |
f3dccf50 RB |
1012 | MR_DEPENDENCE_CLIQUE (ref) = MR_DEPENDENCE_CLIQUE (old); |
1013 | MR_DEPENDENCE_BASE (ref) = MR_DEPENDENCE_BASE (old); | |
f3ae4add | 1014 | DR_UNCONSTRAINED_BASE (dr) = true; |
9771b263 | 1015 | access_fns.safe_push (access_fn); |
2946bd34 | 1016 | } |
86a07404 | 1017 | } |
c4ddde1b RG |
1018 | else if (DECL_P (ref)) |
1019 | { | |
1020 | /* Canonicalize DR_BASE_OBJECT to MEM_REF form. */ | |
1021 | ref = build2 (MEM_REF, TREE_TYPE (ref), | |
1022 | build_fold_addr_expr (ref), | |
1023 | build_int_cst (reference_alias_ptr_type (ref), 0)); | |
1024 | } | |
86a07404 | 1025 | |
3cb960c7 ZD |
1026 | DR_BASE_OBJECT (dr) = ref; |
1027 | DR_ACCESS_FNS (dr) = access_fns; | |
86a07404 IR |
1028 | } |
1029 | ||
3cb960c7 | 1030 | /* Extracts the alias analysis information from the memory reference DR. */ |
86a07404 | 1031 | |
3cb960c7 ZD |
1032 | static void |
1033 | dr_analyze_alias (struct data_reference *dr) | |
86a07404 | 1034 | { |
3cb960c7 | 1035 | tree ref = DR_REF (dr); |
5006671f RG |
1036 | tree base = get_base_address (ref), addr; |
1037 | ||
70f34814 RG |
1038 | if (INDIRECT_REF_P (base) |
1039 | || TREE_CODE (base) == MEM_REF) | |
3cb960c7 ZD |
1040 | { |
1041 | addr = TREE_OPERAND (base, 0); | |
1042 | if (TREE_CODE (addr) == SSA_NAME) | |
5006671f | 1043 | DR_PTR_INFO (dr) = SSA_NAME_PTR_INFO (addr); |
3cb960c7 | 1044 | } |
3cb960c7 | 1045 | } |
86a07404 | 1046 | |
3cb960c7 | 1047 | /* Frees data reference DR. */ |
8fdbc9c6 | 1048 | |
dea61d92 | 1049 | void |
8fdbc9c6 ZD |
1050 | free_data_ref (data_reference_p dr) |
1051 | { | |
9771b263 | 1052 | DR_ACCESS_FNS (dr).release (); |
8fdbc9c6 ZD |
1053 | free (dr); |
1054 | } | |
86a07404 | 1055 | |
3cb960c7 ZD |
1056 | /* Analyzes memory reference MEMREF accessed in STMT. The reference |
1057 | is read if IS_READ is true, write otherwise. Returns the | |
5c640e29 SP |
1058 | data_reference description of MEMREF. NEST is the outermost loop |
1059 | in which the reference should be instantiated, LOOP is the loop in | |
1060 | which the data reference should be analyzed. */ | |
86a07404 | 1061 | |
5417e022 | 1062 | struct data_reference * |
355fe088 | 1063 | create_data_ref (loop_p nest, loop_p loop, tree memref, gimple *stmt, |
5c640e29 | 1064 | bool is_read) |
86a07404 | 1065 | { |
3cb960c7 | 1066 | struct data_reference *dr; |
0ff4040e | 1067 | |
3cb960c7 | 1068 | if (dump_file && (dump_flags & TDF_DETAILS)) |
0ff4040e | 1069 | { |
3cb960c7 ZD |
1070 | fprintf (dump_file, "Creating dr for "); |
1071 | print_generic_expr (dump_file, memref, TDF_SLIM); | |
1072 | fprintf (dump_file, "\n"); | |
0ff4040e | 1073 | } |
e2157b49 | 1074 | |
3cb960c7 ZD |
1075 | dr = XCNEW (struct data_reference); |
1076 | DR_STMT (dr) = stmt; | |
1077 | DR_REF (dr) = memref; | |
1078 | DR_IS_READ (dr) = is_read; | |
86a07404 | 1079 | |
4e4452b6 | 1080 | dr_analyze_innermost (dr, nest); |
5c640e29 | 1081 | dr_analyze_indices (dr, nest, loop); |
3cb960c7 | 1082 | dr_analyze_alias (dr); |
86a07404 IR |
1083 | |
1084 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
1085 | { | |
b8324815 | 1086 | unsigned i; |
3cb960c7 | 1087 | fprintf (dump_file, "\tbase_address: "); |
86a07404 IR |
1088 | print_generic_expr (dump_file, DR_BASE_ADDRESS (dr), TDF_SLIM); |
1089 | fprintf (dump_file, "\n\toffset from base address: "); | |
1090 | print_generic_expr (dump_file, DR_OFFSET (dr), TDF_SLIM); | |
1091 | fprintf (dump_file, "\n\tconstant offset from base address: "); | |
1092 | print_generic_expr (dump_file, DR_INIT (dr), TDF_SLIM); | |
86a07404 IR |
1093 | fprintf (dump_file, "\n\tstep: "); |
1094 | print_generic_expr (dump_file, DR_STEP (dr), TDF_SLIM); | |
3cb960c7 ZD |
1095 | fprintf (dump_file, "\n\taligned to: "); |
1096 | print_generic_expr (dump_file, DR_ALIGNED_TO (dr), TDF_SLIM); | |
1097 | fprintf (dump_file, "\n\tbase_object: "); | |
1098 | print_generic_expr (dump_file, DR_BASE_OBJECT (dr), TDF_SLIM); | |
86a07404 | 1099 | fprintf (dump_file, "\n"); |
b8324815 RG |
1100 | for (i = 0; i < DR_NUM_DIMENSIONS (dr); i++) |
1101 | { | |
1102 | fprintf (dump_file, "\tAccess function %d: ", i); | |
1103 | print_generic_stmt (dump_file, DR_ACCESS_FN (dr, i), TDF_SLIM); | |
1104 | } | |
3cb960c7 ZD |
1105 | } |
1106 | ||
b8698a0f | 1107 | return dr; |
86a07404 IR |
1108 | } |
1109 | ||
bfe068c3 IR |
1110 | /* Check if OFFSET1 and OFFSET2 (DR_OFFSETs of some data-refs) are identical |
1111 | expressions. */ | |
1112 | static bool | |
1113 | dr_equal_offsets_p1 (tree offset1, tree offset2) | |
1114 | { | |
1115 | bool res; | |
1116 | ||
1117 | STRIP_NOPS (offset1); | |
1118 | STRIP_NOPS (offset2); | |
1119 | ||
1120 | if (offset1 == offset2) | |
1121 | return true; | |
1122 | ||
1123 | if (TREE_CODE (offset1) != TREE_CODE (offset2) | |
1124 | || (!BINARY_CLASS_P (offset1) && !UNARY_CLASS_P (offset1))) | |
1125 | return false; | |
1126 | ||
1127 | res = dr_equal_offsets_p1 (TREE_OPERAND (offset1, 0), | |
1128 | TREE_OPERAND (offset2, 0)); | |
1129 | ||
1130 | if (!res || !BINARY_CLASS_P (offset1)) | |
1131 | return res; | |
1132 | ||
1133 | res = dr_equal_offsets_p1 (TREE_OPERAND (offset1, 1), | |
1134 | TREE_OPERAND (offset2, 1)); | |
1135 | ||
1136 | return res; | |
1137 | } | |
1138 | ||
1139 | /* Check if DRA and DRB have equal offsets. */ | |
1140 | bool | |
1141 | dr_equal_offsets_p (struct data_reference *dra, | |
1142 | struct data_reference *drb) | |
1143 | { | |
1144 | tree offset1, offset2; | |
1145 | ||
1146 | offset1 = DR_OFFSET (dra); | |
1147 | offset2 = DR_OFFSET (drb); | |
1148 | ||
1149 | return dr_equal_offsets_p1 (offset1, offset2); | |
1150 | } | |
1151 | ||
d93817c4 ZD |
1152 | /* Returns true if FNA == FNB. */ |
1153 | ||
1154 | static bool | |
1155 | affine_function_equal_p (affine_fn fna, affine_fn fnb) | |
1156 | { | |
9771b263 | 1157 | unsigned i, n = fna.length (); |
86a07404 | 1158 | |
9771b263 | 1159 | if (n != fnb.length ()) |
f86289d5 | 1160 | return false; |
86df10e3 | 1161 | |
d93817c4 | 1162 | for (i = 0; i < n; i++) |
9771b263 | 1163 | if (!operand_equal_p (fna[i], fnb[i], 0)) |
d93817c4 ZD |
1164 | return false; |
1165 | ||
1166 | return true; | |
1167 | } | |
1168 | ||
1169 | /* If all the functions in CF are the same, returns one of them, | |
1170 | otherwise returns NULL. */ | |
1171 | ||
1172 | static affine_fn | |
1173 | common_affine_function (conflict_function *cf) | |
86df10e3 | 1174 | { |
d93817c4 ZD |
1175 | unsigned i; |
1176 | affine_fn comm; | |
1177 | ||
1178 | if (!CF_NONTRIVIAL_P (cf)) | |
c3284718 | 1179 | return affine_fn (); |
d93817c4 ZD |
1180 | |
1181 | comm = cf->fns[0]; | |
1182 | ||
1183 | for (i = 1; i < cf->n; i++) | |
1184 | if (!affine_function_equal_p (comm, cf->fns[i])) | |
c3284718 | 1185 | return affine_fn (); |
d93817c4 ZD |
1186 | |
1187 | return comm; | |
1188 | } | |
86df10e3 | 1189 | |
d93817c4 ZD |
1190 | /* Returns the base of the affine function FN. */ |
1191 | ||
1192 | static tree | |
1193 | affine_function_base (affine_fn fn) | |
1194 | { | |
9771b263 | 1195 | return fn[0]; |
d93817c4 ZD |
1196 | } |
1197 | ||
1198 | /* Returns true if FN is a constant. */ | |
1199 | ||
1200 | static bool | |
1201 | affine_function_constant_p (affine_fn fn) | |
1202 | { | |
1203 | unsigned i; | |
1204 | tree coef; | |
1205 | ||
9771b263 | 1206 | for (i = 1; fn.iterate (i, &coef); i++) |
d93817c4 | 1207 | if (!integer_zerop (coef)) |
e2157b49 SP |
1208 | return false; |
1209 | ||
86df10e3 SP |
1210 | return true; |
1211 | } | |
1212 | ||
1baf2906 SP |
1213 | /* Returns true if FN is the zero constant function. */ |
1214 | ||
1215 | static bool | |
1216 | affine_function_zero_p (affine_fn fn) | |
1217 | { | |
1218 | return (integer_zerop (affine_function_base (fn)) | |
1219 | && affine_function_constant_p (fn)); | |
1220 | } | |
1221 | ||
33b30201 SP |
1222 | /* Returns a signed integer type with the largest precision from TA |
1223 | and TB. */ | |
1224 | ||
1225 | static tree | |
1226 | signed_type_for_types (tree ta, tree tb) | |
1227 | { | |
1228 | if (TYPE_PRECISION (ta) > TYPE_PRECISION (tb)) | |
1229 | return signed_type_for (ta); | |
1230 | else | |
1231 | return signed_type_for (tb); | |
1232 | } | |
1233 | ||
d93817c4 ZD |
1234 | /* Applies operation OP on affine functions FNA and FNB, and returns the |
1235 | result. */ | |
1236 | ||
1237 | static affine_fn | |
1238 | affine_fn_op (enum tree_code op, affine_fn fna, affine_fn fnb) | |
1239 | { | |
1240 | unsigned i, n, m; | |
1241 | affine_fn ret; | |
1242 | tree coef; | |
1243 | ||
9771b263 | 1244 | if (fnb.length () > fna.length ()) |
d93817c4 | 1245 | { |
9771b263 DN |
1246 | n = fna.length (); |
1247 | m = fnb.length (); | |
d93817c4 ZD |
1248 | } |
1249 | else | |
1250 | { | |
9771b263 DN |
1251 | n = fnb.length (); |
1252 | m = fna.length (); | |
d93817c4 ZD |
1253 | } |
1254 | ||
9771b263 | 1255 | ret.create (m); |
d93817c4 | 1256 | for (i = 0; i < n; i++) |
33b30201 | 1257 | { |
9771b263 DN |
1258 | tree type = signed_type_for_types (TREE_TYPE (fna[i]), |
1259 | TREE_TYPE (fnb[i])); | |
1260 | ret.quick_push (fold_build2 (op, type, fna[i], fnb[i])); | |
33b30201 | 1261 | } |
d93817c4 | 1262 | |
9771b263 DN |
1263 | for (; fna.iterate (i, &coef); i++) |
1264 | ret.quick_push (fold_build2 (op, signed_type_for (TREE_TYPE (coef)), | |
d93817c4 | 1265 | coef, integer_zero_node)); |
9771b263 DN |
1266 | for (; fnb.iterate (i, &coef); i++) |
1267 | ret.quick_push (fold_build2 (op, signed_type_for (TREE_TYPE (coef)), | |
d93817c4 ZD |
1268 | integer_zero_node, coef)); |
1269 | ||
1270 | return ret; | |
1271 | } | |
1272 | ||
1273 | /* Returns the sum of affine functions FNA and FNB. */ | |
1274 | ||
1275 | static affine_fn | |
1276 | affine_fn_plus (affine_fn fna, affine_fn fnb) | |
1277 | { | |
1278 | return affine_fn_op (PLUS_EXPR, fna, fnb); | |
1279 | } | |
1280 | ||
1281 | /* Returns the difference of affine functions FNA and FNB. */ | |
1282 | ||
1283 | static affine_fn | |
1284 | affine_fn_minus (affine_fn fna, affine_fn fnb) | |
1285 | { | |
1286 | return affine_fn_op (MINUS_EXPR, fna, fnb); | |
1287 | } | |
1288 | ||
1289 | /* Frees affine function FN. */ | |
1290 | ||
1291 | static void | |
1292 | affine_fn_free (affine_fn fn) | |
1293 | { | |
9771b263 | 1294 | fn.release (); |
d93817c4 ZD |
1295 | } |
1296 | ||
86df10e3 SP |
1297 | /* Determine for each subscript in the data dependence relation DDR |
1298 | the distance. */ | |
56cf8686 | 1299 | |
0ff4040e | 1300 | static void |
86df10e3 | 1301 | compute_subscript_distance (struct data_dependence_relation *ddr) |
56cf8686 | 1302 | { |
d93817c4 ZD |
1303 | conflict_function *cf_a, *cf_b; |
1304 | affine_fn fn_a, fn_b, diff; | |
1305 | ||
56cf8686 SP |
1306 | if (DDR_ARE_DEPENDENT (ddr) == NULL_TREE) |
1307 | { | |
1308 | unsigned int i; | |
b8698a0f | 1309 | |
56cf8686 SP |
1310 | for (i = 0; i < DDR_NUM_SUBSCRIPTS (ddr); i++) |
1311 | { | |
56cf8686 | 1312 | struct subscript *subscript; |
b8698a0f | 1313 | |
56cf8686 | 1314 | subscript = DDR_SUBSCRIPT (ddr, i); |
d93817c4 ZD |
1315 | cf_a = SUB_CONFLICTS_IN_A (subscript); |
1316 | cf_b = SUB_CONFLICTS_IN_B (subscript); | |
86df10e3 | 1317 | |
d93817c4 ZD |
1318 | fn_a = common_affine_function (cf_a); |
1319 | fn_b = common_affine_function (cf_b); | |
9771b263 | 1320 | if (!fn_a.exists () || !fn_b.exists ()) |
86df10e3 | 1321 | { |
d93817c4 ZD |
1322 | SUB_DISTANCE (subscript) = chrec_dont_know; |
1323 | return; | |
86df10e3 | 1324 | } |
d93817c4 | 1325 | diff = affine_fn_minus (fn_a, fn_b); |
b8698a0f | 1326 | |
d93817c4 ZD |
1327 | if (affine_function_constant_p (diff)) |
1328 | SUB_DISTANCE (subscript) = affine_function_base (diff); | |
56cf8686 SP |
1329 | else |
1330 | SUB_DISTANCE (subscript) = chrec_dont_know; | |
d93817c4 ZD |
1331 | |
1332 | affine_fn_free (diff); | |
56cf8686 SP |
1333 | } |
1334 | } | |
1335 | } | |
1336 | ||
d93817c4 ZD |
1337 | /* Returns the conflict function for "unknown". */ |
1338 | ||
1339 | static conflict_function * | |
1340 | conflict_fn_not_known (void) | |
1341 | { | |
1342 | conflict_function *fn = XCNEW (conflict_function); | |
1343 | fn->n = NOT_KNOWN; | |
1344 | ||
1345 | return fn; | |
1346 | } | |
1347 | ||
1348 | /* Returns the conflict function for "independent". */ | |
1349 | ||
1350 | static conflict_function * | |
1351 | conflict_fn_no_dependence (void) | |
1352 | { | |
1353 | conflict_function *fn = XCNEW (conflict_function); | |
1354 | fn->n = NO_DEPENDENCE; | |
1355 | ||
1356 | return fn; | |
1357 | } | |
1358 | ||
3cb960c7 ZD |
1359 | /* Returns true if the address of OBJ is invariant in LOOP. */ |
1360 | ||
1361 | static bool | |
ed7a4b4b | 1362 | object_address_invariant_in_loop_p (const struct loop *loop, const_tree obj) |
3cb960c7 ZD |
1363 | { |
1364 | while (handled_component_p (obj)) | |
1365 | { | |
1366 | if (TREE_CODE (obj) == ARRAY_REF) | |
1367 | { | |
1368 | /* Index of the ARRAY_REF was zeroed in analyze_indices, thus we only | |
1369 | need to check the stride and the lower bound of the reference. */ | |
1370 | if (chrec_contains_symbols_defined_in_loop (TREE_OPERAND (obj, 2), | |
1371 | loop->num) | |
1372 | || chrec_contains_symbols_defined_in_loop (TREE_OPERAND (obj, 3), | |
1373 | loop->num)) | |
1374 | return false; | |
1375 | } | |
1376 | else if (TREE_CODE (obj) == COMPONENT_REF) | |
1377 | { | |
1378 | if (chrec_contains_symbols_defined_in_loop (TREE_OPERAND (obj, 2), | |
1379 | loop->num)) | |
1380 | return false; | |
1381 | } | |
1382 | obj = TREE_OPERAND (obj, 0); | |
1383 | } | |
1384 | ||
70f34814 RG |
1385 | if (!INDIRECT_REF_P (obj) |
1386 | && TREE_CODE (obj) != MEM_REF) | |
3cb960c7 ZD |
1387 | return true; |
1388 | ||
1389 | return !chrec_contains_symbols_defined_in_loop (TREE_OPERAND (obj, 0), | |
1390 | loop->num); | |
1391 | } | |
1392 | ||
3cb960c7 | 1393 | /* Returns false if we can prove that data references A and B do not alias, |
02f5d6c5 RG |
1394 | true otherwise. If LOOP_NEST is false no cross-iteration aliases are |
1395 | considered. */ | |
3cb960c7 | 1396 | |
f8bf9252 | 1397 | bool |
02f5d6c5 RG |
1398 | dr_may_alias_p (const struct data_reference *a, const struct data_reference *b, |
1399 | bool loop_nest) | |
3cb960c7 | 1400 | { |
7d36e538 RG |
1401 | tree addr_a = DR_BASE_OBJECT (a); |
1402 | tree addr_b = DR_BASE_OBJECT (b); | |
3cb960c7 | 1403 | |
02f5d6c5 RG |
1404 | /* If we are not processing a loop nest but scalar code we |
1405 | do not need to care about possible cross-iteration dependences | |
1406 | and thus can process the full original reference. Do so, | |
1407 | similar to how loop invariant motion applies extra offset-based | |
1408 | disambiguation. */ | |
1409 | if (!loop_nest) | |
1410 | { | |
1411 | aff_tree off1, off2; | |
807e902e | 1412 | widest_int size1, size2; |
02f5d6c5 RG |
1413 | get_inner_reference_aff (DR_REF (a), &off1, &size1); |
1414 | get_inner_reference_aff (DR_REF (b), &off2, &size2); | |
807e902e | 1415 | aff_combination_scale (&off1, -1); |
02f5d6c5 RG |
1416 | aff_combination_add (&off2, &off1); |
1417 | if (aff_comb_cannot_overlap_p (&off2, size1, size2)) | |
1418 | return false; | |
1419 | } | |
1420 | ||
f3dccf50 RB |
1421 | if ((TREE_CODE (addr_a) == MEM_REF || TREE_CODE (addr_a) == TARGET_MEM_REF) |
1422 | && (TREE_CODE (addr_b) == MEM_REF || TREE_CODE (addr_b) == TARGET_MEM_REF) | |
1423 | && MR_DEPENDENCE_CLIQUE (addr_a) == MR_DEPENDENCE_CLIQUE (addr_b) | |
1424 | && MR_DEPENDENCE_BASE (addr_a) != MR_DEPENDENCE_BASE (addr_b)) | |
1425 | return false; | |
1426 | ||
6e2028ff RB |
1427 | /* If we had an evolution in a pointer-based MEM_REF BASE_OBJECT we |
1428 | do not know the size of the base-object. So we cannot do any | |
1429 | offset/overlap based analysis but have to rely on points-to | |
1430 | information only. */ | |
c4ddde1b | 1431 | if (TREE_CODE (addr_a) == MEM_REF |
f3ae4add RB |
1432 | && (DR_UNCONSTRAINED_BASE (a) |
1433 | || TREE_CODE (TREE_OPERAND (addr_a, 0)) == SSA_NAME)) | |
c4ddde1b | 1434 | { |
6e2028ff RB |
1435 | /* For true dependences we can apply TBAA. */ |
1436 | if (flag_strict_aliasing | |
1437 | && DR_IS_WRITE (a) && DR_IS_READ (b) | |
1438 | && !alias_sets_conflict_p (get_alias_set (DR_REF (a)), | |
1439 | get_alias_set (DR_REF (b)))) | |
1440 | return false; | |
1441 | if (TREE_CODE (addr_b) == MEM_REF) | |
c4ddde1b RG |
1442 | return ptr_derefs_may_alias_p (TREE_OPERAND (addr_a, 0), |
1443 | TREE_OPERAND (addr_b, 0)); | |
1444 | else | |
1445 | return ptr_derefs_may_alias_p (TREE_OPERAND (addr_a, 0), | |
1446 | build_fold_addr_expr (addr_b)); | |
1447 | } | |
1448 | else if (TREE_CODE (addr_b) == MEM_REF | |
f3ae4add RB |
1449 | && (DR_UNCONSTRAINED_BASE (b) |
1450 | || TREE_CODE (TREE_OPERAND (addr_b, 0)) == SSA_NAME)) | |
6e2028ff RB |
1451 | { |
1452 | /* For true dependences we can apply TBAA. */ | |
1453 | if (flag_strict_aliasing | |
1454 | && DR_IS_WRITE (a) && DR_IS_READ (b) | |
1455 | && !alias_sets_conflict_p (get_alias_set (DR_REF (a)), | |
1456 | get_alias_set (DR_REF (b)))) | |
1457 | return false; | |
1458 | if (TREE_CODE (addr_a) == MEM_REF) | |
1459 | return ptr_derefs_may_alias_p (TREE_OPERAND (addr_a, 0), | |
1460 | TREE_OPERAND (addr_b, 0)); | |
1461 | else | |
1462 | return ptr_derefs_may_alias_p (build_fold_addr_expr (addr_a), | |
1463 | TREE_OPERAND (addr_b, 0)); | |
1464 | } | |
c4ddde1b RG |
1465 | |
1466 | /* Otherwise DR_BASE_OBJECT is an access that covers the whole object | |
1467 | that is being subsetted in the loop nest. */ | |
b0af49c4 | 1468 | if (DR_IS_WRITE (a) && DR_IS_WRITE (b)) |
7d36e538 | 1469 | return refs_output_dependent_p (addr_a, addr_b); |
b0af49c4 | 1470 | else if (DR_IS_READ (a) && DR_IS_WRITE (b)) |
7d36e538 RG |
1471 | return refs_anti_dependent_p (addr_a, addr_b); |
1472 | return refs_may_alias_p (addr_a, addr_b); | |
3cb960c7 ZD |
1473 | } |
1474 | ||
0ff4040e SP |
1475 | /* Initialize a data dependence relation between data accesses A and |
1476 | B. NB_LOOPS is the number of loops surrounding the references: the | |
1477 | size of the classic distance/direction vectors. */ | |
56cf8686 | 1478 | |
aec7ae7d | 1479 | struct data_dependence_relation * |
b8698a0f | 1480 | initialize_data_dependence_relation (struct data_reference *a, |
0ff4040e | 1481 | struct data_reference *b, |
9771b263 | 1482 | vec<loop_p> loop_nest) |
56cf8686 SP |
1483 | { |
1484 | struct data_dependence_relation *res; | |
0ff4040e | 1485 | unsigned int i; |
b8698a0f | 1486 | |
5ed6ace5 | 1487 | res = XNEW (struct data_dependence_relation); |
56cf8686 SP |
1488 | DDR_A (res) = a; |
1489 | DDR_B (res) = b; | |
9771b263 | 1490 | DDR_LOOP_NEST (res).create (0); |
71d5b5e1 | 1491 | DDR_REVERSED_P (res) = false; |
9771b263 DN |
1492 | DDR_SUBSCRIPTS (res).create (0); |
1493 | DDR_DIR_VECTS (res).create (0); | |
1494 | DDR_DIST_VECTS (res).create (0); | |
56cf8686 | 1495 | |
86a07404 IR |
1496 | if (a == NULL || b == NULL) |
1497 | { | |
b8698a0f | 1498 | DDR_ARE_DEPENDENT (res) = chrec_dont_know; |
86a07404 | 1499 | return res; |
b8698a0f | 1500 | } |
86a07404 | 1501 | |
3cb960c7 | 1502 | /* If the data references do not alias, then they are independent. */ |
9771b263 | 1503 | if (!dr_may_alias_p (a, b, loop_nest.exists ())) |
86a07404 | 1504 | { |
b8698a0f | 1505 | DDR_ARE_DEPENDENT (res) = chrec_known; |
86a07404 IR |
1506 | return res; |
1507 | } | |
56cf8686 | 1508 | |
fea99a37 | 1509 | /* The case where the references are exactly the same. */ |
b3924be9 SP |
1510 | if (operand_equal_p (DR_REF (a), DR_REF (b), 0)) |
1511 | { | |
8dfdb419 TV |
1512 | if ((loop_nest.exists () |
1513 | && !object_address_invariant_in_loop_p (loop_nest[0], | |
1514 | DR_BASE_OBJECT (a))) | |
1515 | || DR_NUM_DIMENSIONS (a) == 0) | |
1516 | { | |
1517 | DDR_ARE_DEPENDENT (res) = chrec_dont_know; | |
1518 | return res; | |
1519 | } | |
b3924be9 SP |
1520 | DDR_AFFINE_P (res) = true; |
1521 | DDR_ARE_DEPENDENT (res) = NULL_TREE; | |
9771b263 | 1522 | DDR_SUBSCRIPTS (res).create (DR_NUM_DIMENSIONS (a)); |
b3924be9 SP |
1523 | DDR_LOOP_NEST (res) = loop_nest; |
1524 | DDR_INNER_LOOP (res) = 0; | |
1525 | DDR_SELF_REFERENCE (res) = true; | |
1a4571cb RL |
1526 | for (i = 0; i < DR_NUM_DIMENSIONS (a); i++) |
1527 | { | |
1528 | struct subscript *subscript; | |
1529 | ||
1530 | subscript = XNEW (struct subscript); | |
1531 | SUB_CONFLICTS_IN_A (subscript) = conflict_fn_not_known (); | |
1532 | SUB_CONFLICTS_IN_B (subscript) = conflict_fn_not_known (); | |
1533 | SUB_LAST_CONFLICT (subscript) = chrec_dont_know; | |
1534 | SUB_DISTANCE (subscript) = chrec_dont_know; | |
9771b263 | 1535 | DDR_SUBSCRIPTS (res).safe_push (subscript); |
1a4571cb | 1536 | } |
b3924be9 SP |
1537 | return res; |
1538 | } | |
1539 | ||
3cb960c7 | 1540 | /* If the references do not access the same object, we do not know |
eb09cdcb RB |
1541 | whether they alias or not. We do not care about TBAA or alignment |
1542 | info so we can use OEP_ADDRESS_OF to avoid false negatives. | |
1543 | But the accesses have to use compatible types as otherwise the | |
1544 | built indices would not match. */ | |
1545 | if (!operand_equal_p (DR_BASE_OBJECT (a), DR_BASE_OBJECT (b), OEP_ADDRESS_OF) | |
1546 | || !types_compatible_p (TREE_TYPE (DR_BASE_OBJECT (a)), | |
1547 | TREE_TYPE (DR_BASE_OBJECT (b)))) | |
56cf8686 | 1548 | { |
b8698a0f | 1549 | DDR_ARE_DEPENDENT (res) = chrec_dont_know; |
86a07404 IR |
1550 | return res; |
1551 | } | |
0ff4040e | 1552 | |
3cb960c7 | 1553 | /* If the base of the object is not invariant in the loop nest, we cannot |
0d52bcc1 | 1554 | analyze it. TODO -- in fact, it would suffice to record that there may |
c80b4100 | 1555 | be arbitrary dependences in the loops where the base object varies. */ |
8dfdb419 TV |
1556 | if ((loop_nest.exists () |
1557 | && !object_address_invariant_in_loop_p (loop_nest[0], DR_BASE_OBJECT (a))) | |
1558 | || DR_NUM_DIMENSIONS (a) == 0) | |
86a07404 | 1559 | { |
b8698a0f | 1560 | DDR_ARE_DEPENDENT (res) = chrec_dont_know; |
86a07404 IR |
1561 | return res; |
1562 | } | |
3cb960c7 | 1563 | |
19368333 RG |
1564 | /* If the number of dimensions of the access to not agree we can have |
1565 | a pointer access to a component of the array element type and an | |
1566 | array access while the base-objects are still the same. Punt. */ | |
1567 | if (DR_NUM_DIMENSIONS (a) != DR_NUM_DIMENSIONS (b)) | |
1568 | { | |
1569 | DDR_ARE_DEPENDENT (res) = chrec_dont_know; | |
1570 | return res; | |
1571 | } | |
3cb960c7 | 1572 | |
86a07404 IR |
1573 | DDR_AFFINE_P (res) = true; |
1574 | DDR_ARE_DEPENDENT (res) = NULL_TREE; | |
9771b263 | 1575 | DDR_SUBSCRIPTS (res).create (DR_NUM_DIMENSIONS (a)); |
ba42e045 | 1576 | DDR_LOOP_NEST (res) = loop_nest; |
3d8864c0 | 1577 | DDR_INNER_LOOP (res) = 0; |
b3924be9 | 1578 | DDR_SELF_REFERENCE (res) = false; |
304afda6 | 1579 | |
86a07404 IR |
1580 | for (i = 0; i < DR_NUM_DIMENSIONS (a); i++) |
1581 | { | |
1582 | struct subscript *subscript; | |
b8698a0f | 1583 | |
5ed6ace5 | 1584 | subscript = XNEW (struct subscript); |
d93817c4 ZD |
1585 | SUB_CONFLICTS_IN_A (subscript) = conflict_fn_not_known (); |
1586 | SUB_CONFLICTS_IN_B (subscript) = conflict_fn_not_known (); | |
86a07404 IR |
1587 | SUB_LAST_CONFLICT (subscript) = chrec_dont_know; |
1588 | SUB_DISTANCE (subscript) = chrec_dont_know; | |
9771b263 | 1589 | DDR_SUBSCRIPTS (res).safe_push (subscript); |
56cf8686 | 1590 | } |
ebf78a47 | 1591 | |
56cf8686 SP |
1592 | return res; |
1593 | } | |
1594 | ||
d93817c4 ZD |
1595 | /* Frees memory used by the conflict function F. */ |
1596 | ||
1597 | static void | |
1598 | free_conflict_function (conflict_function *f) | |
1599 | { | |
1600 | unsigned i; | |
1601 | ||
1602 | if (CF_NONTRIVIAL_P (f)) | |
1603 | { | |
1604 | for (i = 0; i < f->n; i++) | |
1605 | affine_fn_free (f->fns[i]); | |
1606 | } | |
1607 | free (f); | |
1608 | } | |
1609 | ||
1610 | /* Frees memory used by SUBSCRIPTS. */ | |
1611 | ||
1612 | static void | |
9771b263 | 1613 | free_subscripts (vec<subscript_p> subscripts) |
d93817c4 ZD |
1614 | { |
1615 | unsigned i; | |
1616 | subscript_p s; | |
1617 | ||
9771b263 | 1618 | FOR_EACH_VEC_ELT (subscripts, i, s) |
d93817c4 ZD |
1619 | { |
1620 | free_conflict_function (s->conflicting_iterations_in_a); | |
1621 | free_conflict_function (s->conflicting_iterations_in_b); | |
a0044be5 | 1622 | free (s); |
d93817c4 | 1623 | } |
9771b263 | 1624 | subscripts.release (); |
d93817c4 ZD |
1625 | } |
1626 | ||
56cf8686 SP |
1627 | /* Set DDR_ARE_DEPENDENT to CHREC and finalize the subscript overlap |
1628 | description. */ | |
1629 | ||
1630 | static inline void | |
b8698a0f | 1631 | finalize_ddr_dependent (struct data_dependence_relation *ddr, |
56cf8686 SP |
1632 | tree chrec) |
1633 | { | |
b8698a0f | 1634 | DDR_ARE_DEPENDENT (ddr) = chrec; |
d93817c4 | 1635 | free_subscripts (DDR_SUBSCRIPTS (ddr)); |
9771b263 | 1636 | DDR_SUBSCRIPTS (ddr).create (0); |
56cf8686 SP |
1637 | } |
1638 | ||
86df10e3 SP |
1639 | /* The dependence relation DDR cannot be represented by a distance |
1640 | vector. */ | |
1641 | ||
1642 | static inline void | |
1643 | non_affine_dependence_relation (struct data_dependence_relation *ddr) | |
1644 | { | |
1645 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
1646 | fprintf (dump_file, "(Dependence relation cannot be represented by distance vector.) \n"); | |
1647 | ||
1648 | DDR_AFFINE_P (ddr) = false; | |
1649 | } | |
1650 | ||
56cf8686 SP |
1651 | \f |
1652 | ||
1653 | /* This section contains the classic Banerjee tests. */ | |
1654 | ||
1655 | /* Returns true iff CHREC_A and CHREC_B are not dependent on any index | |
1656 | variables, i.e., if the ZIV (Zero Index Variable) test is true. */ | |
1657 | ||
1658 | static inline bool | |
ed7a4b4b | 1659 | ziv_subscript_p (const_tree chrec_a, const_tree chrec_b) |
56cf8686 SP |
1660 | { |
1661 | return (evolution_function_is_constant_p (chrec_a) | |
1662 | && evolution_function_is_constant_p (chrec_b)); | |
1663 | } | |
1664 | ||
1665 | /* Returns true iff CHREC_A and CHREC_B are dependent on an index | |
1666 | variable, i.e., if the SIV (Single Index Variable) test is true. */ | |
1667 | ||
1668 | static bool | |
ed7a4b4b | 1669 | siv_subscript_p (const_tree chrec_a, const_tree chrec_b) |
56cf8686 SP |
1670 | { |
1671 | if ((evolution_function_is_constant_p (chrec_a) | |
1672 | && evolution_function_is_univariate_p (chrec_b)) | |
1673 | || (evolution_function_is_constant_p (chrec_b) | |
1674 | && evolution_function_is_univariate_p (chrec_a))) | |
1675 | return true; | |
b8698a0f | 1676 | |
56cf8686 SP |
1677 | if (evolution_function_is_univariate_p (chrec_a) |
1678 | && evolution_function_is_univariate_p (chrec_b)) | |
1679 | { | |
1680 | switch (TREE_CODE (chrec_a)) | |
1681 | { | |
1682 | case POLYNOMIAL_CHREC: | |
1683 | switch (TREE_CODE (chrec_b)) | |
1684 | { | |
1685 | case POLYNOMIAL_CHREC: | |
1686 | if (CHREC_VARIABLE (chrec_a) != CHREC_VARIABLE (chrec_b)) | |
1687 | return false; | |
191816a3 | 1688 | /* FALLTHRU */ |
b8698a0f | 1689 | |
56cf8686 SP |
1690 | default: |
1691 | return true; | |
1692 | } | |
b8698a0f | 1693 | |
56cf8686 SP |
1694 | default: |
1695 | return true; | |
1696 | } | |
1697 | } | |
b8698a0f | 1698 | |
56cf8686 SP |
1699 | return false; |
1700 | } | |
1701 | ||
d93817c4 ZD |
1702 | /* Creates a conflict function with N dimensions. The affine functions |
1703 | in each dimension follow. */ | |
1704 | ||
1705 | static conflict_function * | |
1706 | conflict_fn (unsigned n, ...) | |
1707 | { | |
1708 | unsigned i; | |
1709 | conflict_function *ret = XCNEW (conflict_function); | |
1710 | va_list ap; | |
1711 | ||
b39c6706 | 1712 | gcc_assert (0 < n && n <= MAX_DIM); |
c3284718 | 1713 | va_start (ap, n); |
b8698a0f | 1714 | |
d93817c4 ZD |
1715 | ret->n = n; |
1716 | for (i = 0; i < n; i++) | |
1717 | ret->fns[i] = va_arg (ap, affine_fn); | |
c3284718 | 1718 | va_end (ap); |
d93817c4 ZD |
1719 | |
1720 | return ret; | |
1721 | } | |
1722 | ||
1723 | /* Returns constant affine function with value CST. */ | |
1724 | ||
1725 | static affine_fn | |
1726 | affine_fn_cst (tree cst) | |
1727 | { | |
9771b263 DN |
1728 | affine_fn fn; |
1729 | fn.create (1); | |
1730 | fn.quick_push (cst); | |
d93817c4 ZD |
1731 | return fn; |
1732 | } | |
1733 | ||
1734 | /* Returns affine function with single variable, CST + COEF * x_DIM. */ | |
1735 | ||
1736 | static affine_fn | |
1737 | affine_fn_univar (tree cst, unsigned dim, tree coef) | |
1738 | { | |
9771b263 DN |
1739 | affine_fn fn; |
1740 | fn.create (dim + 1); | |
d93817c4 ZD |
1741 | unsigned i; |
1742 | ||
1743 | gcc_assert (dim > 0); | |
9771b263 | 1744 | fn.quick_push (cst); |
d93817c4 | 1745 | for (i = 1; i < dim; i++) |
9771b263 DN |
1746 | fn.quick_push (integer_zero_node); |
1747 | fn.quick_push (coef); | |
d93817c4 ZD |
1748 | return fn; |
1749 | } | |
1750 | ||
56cf8686 SP |
1751 | /* Analyze a ZIV (Zero Index Variable) subscript. *OVERLAPS_A and |
1752 | *OVERLAPS_B are initialized to the functions that describe the | |
1753 | relation between the elements accessed twice by CHREC_A and | |
1754 | CHREC_B. For k >= 0, the following property is verified: | |
1755 | ||
1756 | CHREC_A (*OVERLAPS_A (k)) = CHREC_B (*OVERLAPS_B (k)). */ | |
1757 | ||
b8698a0f L |
1758 | static void |
1759 | analyze_ziv_subscript (tree chrec_a, | |
1760 | tree chrec_b, | |
d93817c4 | 1761 | conflict_function **overlaps_a, |
b8698a0f | 1762 | conflict_function **overlaps_b, |
86df10e3 | 1763 | tree *last_conflicts) |
56cf8686 | 1764 | { |
33b30201 | 1765 | tree type, difference; |
0ff4040e | 1766 | dependence_stats.num_ziv++; |
b8698a0f | 1767 | |
56cf8686 SP |
1768 | if (dump_file && (dump_flags & TDF_DETAILS)) |
1769 | fprintf (dump_file, "(analyze_ziv_subscript \n"); | |
33b30201 SP |
1770 | |
1771 | type = signed_type_for_types (TREE_TYPE (chrec_a), TREE_TYPE (chrec_b)); | |
726a989a RB |
1772 | chrec_a = chrec_convert (type, chrec_a, NULL); |
1773 | chrec_b = chrec_convert (type, chrec_b, NULL); | |
33b30201 | 1774 | difference = chrec_fold_minus (type, chrec_a, chrec_b); |
b8698a0f | 1775 | |
56cf8686 SP |
1776 | switch (TREE_CODE (difference)) |
1777 | { | |
1778 | case INTEGER_CST: | |
1779 | if (integer_zerop (difference)) | |
1780 | { | |
1781 | /* The difference is equal to zero: the accessed index | |
1782 | overlaps for each iteration in the loop. */ | |
d93817c4 ZD |
1783 | *overlaps_a = conflict_fn (1, affine_fn_cst (integer_zero_node)); |
1784 | *overlaps_b = conflict_fn (1, affine_fn_cst (integer_zero_node)); | |
86df10e3 | 1785 | *last_conflicts = chrec_dont_know; |
0ff4040e | 1786 | dependence_stats.num_ziv_dependent++; |
56cf8686 SP |
1787 | } |
1788 | else | |
1789 | { | |
1790 | /* The accesses do not overlap. */ | |
d93817c4 ZD |
1791 | *overlaps_a = conflict_fn_no_dependence (); |
1792 | *overlaps_b = conflict_fn_no_dependence (); | |
86df10e3 | 1793 | *last_conflicts = integer_zero_node; |
0ff4040e | 1794 | dependence_stats.num_ziv_independent++; |
56cf8686 SP |
1795 | } |
1796 | break; | |
b8698a0f | 1797 | |
56cf8686 | 1798 | default: |
b8698a0f | 1799 | /* We're not sure whether the indexes overlap. For the moment, |
56cf8686 | 1800 | conservatively answer "don't know". */ |
0ff4040e SP |
1801 | if (dump_file && (dump_flags & TDF_DETAILS)) |
1802 | fprintf (dump_file, "ziv test failed: difference is non-integer.\n"); | |
1803 | ||
d93817c4 ZD |
1804 | *overlaps_a = conflict_fn_not_known (); |
1805 | *overlaps_b = conflict_fn_not_known (); | |
86df10e3 | 1806 | *last_conflicts = chrec_dont_know; |
0ff4040e | 1807 | dependence_stats.num_ziv_unimplemented++; |
56cf8686 SP |
1808 | break; |
1809 | } | |
b8698a0f | 1810 | |
56cf8686 SP |
1811 | if (dump_file && (dump_flags & TDF_DETAILS)) |
1812 | fprintf (dump_file, ")\n"); | |
1813 | } | |
1814 | ||
b4a9343c | 1815 | /* Similar to max_stmt_executions_int, but returns the bound as a tree, |
4839cb59 | 1816 | and only if it fits to the int type. If this is not the case, or the |
b4a9343c | 1817 | bound on the number of iterations of LOOP could not be derived, returns |
4839cb59 ZD |
1818 | chrec_dont_know. */ |
1819 | ||
1820 | static tree | |
b4a9343c | 1821 | max_stmt_executions_tree (struct loop *loop) |
4839cb59 | 1822 | { |
807e902e | 1823 | widest_int nit; |
4839cb59 | 1824 | |
652c4c71 | 1825 | if (!max_stmt_executions (loop, &nit)) |
4839cb59 ZD |
1826 | return chrec_dont_know; |
1827 | ||
807e902e | 1828 | if (!wi::fits_to_tree_p (nit, unsigned_type_node)) |
4839cb59 ZD |
1829 | return chrec_dont_know; |
1830 | ||
807e902e | 1831 | return wide_int_to_tree (unsigned_type_node, nit); |
4839cb59 ZD |
1832 | } |
1833 | ||
5f1fab58 RG |
1834 | /* Determine whether the CHREC is always positive/negative. If the expression |
1835 | cannot be statically analyzed, return false, otherwise set the answer into | |
1836 | VALUE. */ | |
1837 | ||
1838 | static bool | |
1839 | chrec_is_positive (tree chrec, bool *value) | |
1840 | { | |
1841 | bool value0, value1, value2; | |
1842 | tree end_value, nb_iter; | |
1843 | ||
1844 | switch (TREE_CODE (chrec)) | |
1845 | { | |
1846 | case POLYNOMIAL_CHREC: | |
1847 | if (!chrec_is_positive (CHREC_LEFT (chrec), &value0) | |
1848 | || !chrec_is_positive (CHREC_RIGHT (chrec), &value1)) | |
1849 | return false; | |
1850 | ||
1851 | /* FIXME -- overflows. */ | |
1852 | if (value0 == value1) | |
1853 | { | |
1854 | *value = value0; | |
1855 | return true; | |
1856 | } | |
1857 | ||
1858 | /* Otherwise the chrec is under the form: "{-197, +, 2}_1", | |
1859 | and the proof consists in showing that the sign never | |
1860 | changes during the execution of the loop, from 0 to | |
1861 | loop->nb_iterations. */ | |
1862 | if (!evolution_function_is_affine_p (chrec)) | |
1863 | return false; | |
1864 | ||
1865 | nb_iter = number_of_latch_executions (get_chrec_loop (chrec)); | |
1866 | if (chrec_contains_undetermined (nb_iter)) | |
1867 | return false; | |
1868 | ||
1869 | #if 0 | |
1870 | /* TODO -- If the test is after the exit, we may decrease the number of | |
1871 | iterations by one. */ | |
1872 | if (after_exit) | |
1873 | nb_iter = chrec_fold_minus (type, nb_iter, build_int_cst (type, 1)); | |
1874 | #endif | |
1875 | ||
1876 | end_value = chrec_apply (CHREC_VARIABLE (chrec), chrec, nb_iter); | |
1877 | ||
1878 | if (!chrec_is_positive (end_value, &value2)) | |
1879 | return false; | |
1880 | ||
1881 | *value = value0; | |
1882 | return value0 == value1; | |
1883 | ||
1884 | case INTEGER_CST: | |
1885 | switch (tree_int_cst_sgn (chrec)) | |
1886 | { | |
1887 | case -1: | |
1888 | *value = false; | |
1889 | break; | |
1890 | case 1: | |
1891 | *value = true; | |
1892 | break; | |
1893 | default: | |
1894 | return false; | |
1895 | } | |
1896 | return true; | |
1897 | ||
1898 | default: | |
1899 | return false; | |
1900 | } | |
1901 | } | |
1902 | ||
1903 | ||
56cf8686 SP |
1904 | /* Analyze a SIV (Single Index Variable) subscript where CHREC_A is a |
1905 | constant, and CHREC_B is an affine function. *OVERLAPS_A and | |
1906 | *OVERLAPS_B are initialized to the functions that describe the | |
1907 | relation between the elements accessed twice by CHREC_A and | |
1908 | CHREC_B. For k >= 0, the following property is verified: | |
1909 | ||
1910 | CHREC_A (*OVERLAPS_A (k)) = CHREC_B (*OVERLAPS_B (k)). */ | |
1911 | ||
1912 | static void | |
b8698a0f | 1913 | analyze_siv_subscript_cst_affine (tree chrec_a, |
56cf8686 | 1914 | tree chrec_b, |
b8698a0f L |
1915 | conflict_function **overlaps_a, |
1916 | conflict_function **overlaps_b, | |
86df10e3 | 1917 | tree *last_conflicts) |
56cf8686 SP |
1918 | { |
1919 | bool value0, value1, value2; | |
33b30201 | 1920 | tree type, difference, tmp; |
e2157b49 | 1921 | |
33b30201 | 1922 | type = signed_type_for_types (TREE_TYPE (chrec_a), TREE_TYPE (chrec_b)); |
726a989a RB |
1923 | chrec_a = chrec_convert (type, chrec_a, NULL); |
1924 | chrec_b = chrec_convert (type, chrec_b, NULL); | |
33b30201 | 1925 | difference = chrec_fold_minus (type, initial_condition (chrec_b), chrec_a); |
b8698a0f | 1926 | |
5f1fab58 RG |
1927 | /* Special case overlap in the first iteration. */ |
1928 | if (integer_zerop (difference)) | |
1929 | { | |
1930 | *overlaps_a = conflict_fn (1, affine_fn_cst (integer_zero_node)); | |
1931 | *overlaps_b = conflict_fn (1, affine_fn_cst (integer_zero_node)); | |
1932 | *last_conflicts = integer_one_node; | |
1933 | return; | |
1934 | } | |
1935 | ||
56cf8686 SP |
1936 | if (!chrec_is_positive (initial_condition (difference), &value0)) |
1937 | { | |
0ff4040e | 1938 | if (dump_file && (dump_flags & TDF_DETAILS)) |
b8698a0f | 1939 | fprintf (dump_file, "siv test failed: chrec is not positive.\n"); |
0ff4040e SP |
1940 | |
1941 | dependence_stats.num_siv_unimplemented++; | |
d93817c4 ZD |
1942 | *overlaps_a = conflict_fn_not_known (); |
1943 | *overlaps_b = conflict_fn_not_known (); | |
86df10e3 | 1944 | *last_conflicts = chrec_dont_know; |
56cf8686 SP |
1945 | return; |
1946 | } | |
1947 | else | |
1948 | { | |
1949 | if (value0 == false) | |
1950 | { | |
1951 | if (!chrec_is_positive (CHREC_RIGHT (chrec_b), &value1)) | |
1952 | { | |
0ff4040e SP |
1953 | if (dump_file && (dump_flags & TDF_DETAILS)) |
1954 | fprintf (dump_file, "siv test failed: chrec not positive.\n"); | |
1955 | ||
d93817c4 | 1956 | *overlaps_a = conflict_fn_not_known (); |
b8698a0f | 1957 | *overlaps_b = conflict_fn_not_known (); |
86df10e3 | 1958 | *last_conflicts = chrec_dont_know; |
0ff4040e | 1959 | dependence_stats.num_siv_unimplemented++; |
56cf8686 SP |
1960 | return; |
1961 | } | |
1962 | else | |
1963 | { | |
1964 | if (value1 == true) | |
1965 | { | |
b8698a0f | 1966 | /* Example: |
56cf8686 SP |
1967 | chrec_a = 12 |
1968 | chrec_b = {10, +, 1} | |
1969 | */ | |
b8698a0f | 1970 | |
f457cf40 | 1971 | if (tree_fold_divides_p (CHREC_RIGHT (chrec_b), difference)) |
56cf8686 | 1972 | { |
4839cb59 ZD |
1973 | HOST_WIDE_INT numiter; |
1974 | struct loop *loop = get_chrec_loop (chrec_b); | |
416f403e | 1975 | |
d93817c4 | 1976 | *overlaps_a = conflict_fn (1, affine_fn_cst (integer_zero_node)); |
33b30201 SP |
1977 | tmp = fold_build2 (EXACT_DIV_EXPR, type, |
1978 | fold_build1 (ABS_EXPR, type, difference), | |
d93817c4 ZD |
1979 | CHREC_RIGHT (chrec_b)); |
1980 | *overlaps_b = conflict_fn (1, affine_fn_cst (tmp)); | |
86df10e3 | 1981 | *last_conflicts = integer_one_node; |
b8698a0f | 1982 | |
416f403e DB |
1983 | |
1984 | /* Perform weak-zero siv test to see if overlap is | |
1985 | outside the loop bounds. */ | |
652c4c71 | 1986 | numiter = max_stmt_executions_int (loop); |
416f403e | 1987 | |
4839cb59 ZD |
1988 | if (numiter >= 0 |
1989 | && compare_tree_int (tmp, numiter) > 0) | |
416f403e | 1990 | { |
d93817c4 ZD |
1991 | free_conflict_function (*overlaps_a); |
1992 | free_conflict_function (*overlaps_b); | |
1993 | *overlaps_a = conflict_fn_no_dependence (); | |
1994 | *overlaps_b = conflict_fn_no_dependence (); | |
416f403e | 1995 | *last_conflicts = integer_zero_node; |
0ff4040e | 1996 | dependence_stats.num_siv_independent++; |
416f403e | 1997 | return; |
b8698a0f | 1998 | } |
0ff4040e | 1999 | dependence_stats.num_siv_dependent++; |
56cf8686 SP |
2000 | return; |
2001 | } | |
b8698a0f | 2002 | |
f457cf40 | 2003 | /* When the step does not divide the difference, there are |
56cf8686 SP |
2004 | no overlaps. */ |
2005 | else | |
2006 | { | |
d93817c4 | 2007 | *overlaps_a = conflict_fn_no_dependence (); |
b8698a0f | 2008 | *overlaps_b = conflict_fn_no_dependence (); |
86df10e3 | 2009 | *last_conflicts = integer_zero_node; |
0ff4040e | 2010 | dependence_stats.num_siv_independent++; |
56cf8686 SP |
2011 | return; |
2012 | } | |
2013 | } | |
b8698a0f | 2014 | |
56cf8686 SP |
2015 | else |
2016 | { | |
b8698a0f | 2017 | /* Example: |
56cf8686 SP |
2018 | chrec_a = 12 |
2019 | chrec_b = {10, +, -1} | |
b8698a0f | 2020 | |
56cf8686 | 2021 | In this case, chrec_a will not overlap with chrec_b. */ |
d93817c4 ZD |
2022 | *overlaps_a = conflict_fn_no_dependence (); |
2023 | *overlaps_b = conflict_fn_no_dependence (); | |
86df10e3 | 2024 | *last_conflicts = integer_zero_node; |
0ff4040e | 2025 | dependence_stats.num_siv_independent++; |
56cf8686 SP |
2026 | return; |
2027 | } | |
2028 | } | |
2029 | } | |
b8698a0f | 2030 | else |
56cf8686 SP |
2031 | { |
2032 | if (!chrec_is_positive (CHREC_RIGHT (chrec_b), &value2)) | |
2033 | { | |
0ff4040e SP |
2034 | if (dump_file && (dump_flags & TDF_DETAILS)) |
2035 | fprintf (dump_file, "siv test failed: chrec not positive.\n"); | |
2036 | ||
d93817c4 | 2037 | *overlaps_a = conflict_fn_not_known (); |
b8698a0f | 2038 | *overlaps_b = conflict_fn_not_known (); |
86df10e3 | 2039 | *last_conflicts = chrec_dont_know; |
0ff4040e | 2040 | dependence_stats.num_siv_unimplemented++; |
56cf8686 SP |
2041 | return; |
2042 | } | |
2043 | else | |
2044 | { | |
2045 | if (value2 == false) | |
2046 | { | |
b8698a0f | 2047 | /* Example: |
56cf8686 SP |
2048 | chrec_a = 3 |
2049 | chrec_b = {10, +, -1} | |
2050 | */ | |
f457cf40 | 2051 | if (tree_fold_divides_p (CHREC_RIGHT (chrec_b), difference)) |
56cf8686 | 2052 | { |
4839cb59 ZD |
2053 | HOST_WIDE_INT numiter; |
2054 | struct loop *loop = get_chrec_loop (chrec_b); | |
416f403e | 2055 | |
d93817c4 | 2056 | *overlaps_a = conflict_fn (1, affine_fn_cst (integer_zero_node)); |
33b30201 | 2057 | tmp = fold_build2 (EXACT_DIV_EXPR, type, difference, |
d93817c4 ZD |
2058 | CHREC_RIGHT (chrec_b)); |
2059 | *overlaps_b = conflict_fn (1, affine_fn_cst (tmp)); | |
86df10e3 | 2060 | *last_conflicts = integer_one_node; |
416f403e DB |
2061 | |
2062 | /* Perform weak-zero siv test to see if overlap is | |
2063 | outside the loop bounds. */ | |
652c4c71 | 2064 | numiter = max_stmt_executions_int (loop); |
416f403e | 2065 | |
4839cb59 ZD |
2066 | if (numiter >= 0 |
2067 | && compare_tree_int (tmp, numiter) > 0) | |
416f403e | 2068 | { |
d93817c4 ZD |
2069 | free_conflict_function (*overlaps_a); |
2070 | free_conflict_function (*overlaps_b); | |
2071 | *overlaps_a = conflict_fn_no_dependence (); | |
2072 | *overlaps_b = conflict_fn_no_dependence (); | |
416f403e | 2073 | *last_conflicts = integer_zero_node; |
0ff4040e | 2074 | dependence_stats.num_siv_independent++; |
416f403e | 2075 | return; |
b8698a0f | 2076 | } |
0ff4040e | 2077 | dependence_stats.num_siv_dependent++; |
56cf8686 SP |
2078 | return; |
2079 | } | |
b8698a0f | 2080 | |
4286d8ce | 2081 | /* When the step does not divide the difference, there |
56cf8686 SP |
2082 | are no overlaps. */ |
2083 | else | |
2084 | { | |
d93817c4 | 2085 | *overlaps_a = conflict_fn_no_dependence (); |
b8698a0f | 2086 | *overlaps_b = conflict_fn_no_dependence (); |
86df10e3 | 2087 | *last_conflicts = integer_zero_node; |
0ff4040e | 2088 | dependence_stats.num_siv_independent++; |
56cf8686 SP |
2089 | return; |
2090 | } | |
2091 | } | |
2092 | else | |
2093 | { | |
b8698a0f L |
2094 | /* Example: |
2095 | chrec_a = 3 | |
56cf8686 | 2096 | chrec_b = {4, +, 1} |
b8698a0f | 2097 | |
56cf8686 | 2098 | In this case, chrec_a will not overlap with chrec_b. */ |
d93817c4 ZD |
2099 | *overlaps_a = conflict_fn_no_dependence (); |
2100 | *overlaps_b = conflict_fn_no_dependence (); | |
86df10e3 | 2101 | *last_conflicts = integer_zero_node; |
0ff4040e | 2102 | dependence_stats.num_siv_independent++; |
56cf8686 SP |
2103 | return; |
2104 | } | |
2105 | } | |
2106 | } | |
2107 | } | |
2108 | } | |
2109 | ||
50300b4c | 2110 | /* Helper recursive function for initializing the matrix A. Returns |
86df10e3 | 2111 | the initial value of CHREC. */ |
56cf8686 | 2112 | |
5b78fc3e | 2113 | static tree |
86df10e3 SP |
2114 | initialize_matrix_A (lambda_matrix A, tree chrec, unsigned index, int mult) |
2115 | { | |
2116 | gcc_assert (chrec); | |
2117 | ||
5b78fc3e JS |
2118 | switch (TREE_CODE (chrec)) |
2119 | { | |
2120 | case POLYNOMIAL_CHREC: | |
2121 | gcc_assert (TREE_CODE (CHREC_RIGHT (chrec)) == INTEGER_CST); | |
2122 | ||
2123 | A[index][0] = mult * int_cst_value (CHREC_RIGHT (chrec)); | |
2124 | return initialize_matrix_A (A, CHREC_LEFT (chrec), index + 1, mult); | |
2125 | ||
2126 | case PLUS_EXPR: | |
2127 | case MULT_EXPR: | |
2128 | case MINUS_EXPR: | |
2129 | { | |
2130 | tree op0 = initialize_matrix_A (A, TREE_OPERAND (chrec, 0), index, mult); | |
2131 | tree op1 = initialize_matrix_A (A, TREE_OPERAND (chrec, 1), index, mult); | |
2132 | ||
2133 | return chrec_fold_op (TREE_CODE (chrec), chrec_type (chrec), op0, op1); | |
2134 | } | |
2135 | ||
625a9766 | 2136 | CASE_CONVERT: |
5b78fc3e JS |
2137 | { |
2138 | tree op = initialize_matrix_A (A, TREE_OPERAND (chrec, 0), index, mult); | |
726a989a | 2139 | return chrec_convert (chrec_type (chrec), op, NULL); |
5b78fc3e JS |
2140 | } |
2141 | ||
418df9d7 JJ |
2142 | case BIT_NOT_EXPR: |
2143 | { | |
2144 | /* Handle ~X as -1 - X. */ | |
2145 | tree op = initialize_matrix_A (A, TREE_OPERAND (chrec, 0), index, mult); | |
2146 | return chrec_fold_op (MINUS_EXPR, chrec_type (chrec), | |
2147 | build_int_cst (TREE_TYPE (chrec), -1), op); | |
2148 | } | |
2149 | ||
5b78fc3e JS |
2150 | case INTEGER_CST: |
2151 | return chrec; | |
a1a5996d | 2152 | |
5b78fc3e JS |
2153 | default: |
2154 | gcc_unreachable (); | |
2155 | return NULL_TREE; | |
2156 | } | |
86df10e3 SP |
2157 | } |
2158 | ||
2159 | #define FLOOR_DIV(x,y) ((x) / (y)) | |
2160 | ||
b8698a0f | 2161 | /* Solves the special case of the Diophantine equation: |
86df10e3 SP |
2162 | | {0, +, STEP_A}_x (OVERLAPS_A) = {0, +, STEP_B}_y (OVERLAPS_B) |
2163 | ||
2164 | Computes the descriptions OVERLAPS_A and OVERLAPS_B. NITER is the | |
2165 | number of iterations that loops X and Y run. The overlaps will be | |
2166 | constructed as evolutions in dimension DIM. */ | |
56cf8686 SP |
2167 | |
2168 | static void | |
b8698a0f | 2169 | compute_overlap_steps_for_affine_univar (int niter, int step_a, int step_b, |
d93817c4 | 2170 | affine_fn *overlaps_a, |
b8698a0f | 2171 | affine_fn *overlaps_b, |
86df10e3 SP |
2172 | tree *last_conflicts, int dim) |
2173 | { | |
2174 | if (((step_a > 0 && step_b > 0) | |
2175 | || (step_a < 0 && step_b < 0))) | |
2176 | { | |
2177 | int step_overlaps_a, step_overlaps_b; | |
2178 | int gcd_steps_a_b, last_conflict, tau2; | |
2179 | ||
2180 | gcd_steps_a_b = gcd (step_a, step_b); | |
2181 | step_overlaps_a = step_b / gcd_steps_a_b; | |
2182 | step_overlaps_b = step_a / gcd_steps_a_b; | |
2183 | ||
2c26cbfd SP |
2184 | if (niter > 0) |
2185 | { | |
2186 | tau2 = FLOOR_DIV (niter, step_overlaps_a); | |
2187 | tau2 = MIN (tau2, FLOOR_DIV (niter, step_overlaps_b)); | |
2188 | last_conflict = tau2; | |
2189 | *last_conflicts = build_int_cst (NULL_TREE, last_conflict); | |
2190 | } | |
2191 | else | |
2192 | *last_conflicts = chrec_dont_know; | |
86df10e3 | 2193 | |
b8698a0f | 2194 | *overlaps_a = affine_fn_univar (integer_zero_node, dim, |
d93817c4 ZD |
2195 | build_int_cst (NULL_TREE, |
2196 | step_overlaps_a)); | |
b8698a0f L |
2197 | *overlaps_b = affine_fn_univar (integer_zero_node, dim, |
2198 | build_int_cst (NULL_TREE, | |
d93817c4 | 2199 | step_overlaps_b)); |
86df10e3 SP |
2200 | } |
2201 | ||
2202 | else | |
2203 | { | |
d93817c4 ZD |
2204 | *overlaps_a = affine_fn_cst (integer_zero_node); |
2205 | *overlaps_b = affine_fn_cst (integer_zero_node); | |
86df10e3 SP |
2206 | *last_conflicts = integer_zero_node; |
2207 | } | |
2208 | } | |
2209 | ||
86df10e3 SP |
2210 | /* Solves the special case of a Diophantine equation where CHREC_A is |
2211 | an affine bivariate function, and CHREC_B is an affine univariate | |
b8698a0f | 2212 | function. For example, |
86df10e3 SP |
2213 | |
2214 | | {{0, +, 1}_x, +, 1335}_y = {0, +, 1336}_z | |
b8698a0f L |
2215 | |
2216 | has the following overlapping functions: | |
86df10e3 SP |
2217 | |
2218 | | x (t, u, v) = {{0, +, 1336}_t, +, 1}_v | |
2219 | | y (t, u, v) = {{0, +, 1336}_u, +, 1}_v | |
2220 | | z (t, u, v) = {{{0, +, 1}_t, +, 1335}_u, +, 1}_v | |
2221 | ||
35fd3193 | 2222 | FORNOW: This is a specialized implementation for a case occurring in |
86df10e3 SP |
2223 | a common benchmark. Implement the general algorithm. */ |
2224 | ||
2225 | static void | |
b8698a0f | 2226 | compute_overlap_steps_for_affine_1_2 (tree chrec_a, tree chrec_b, |
d93817c4 | 2227 | conflict_function **overlaps_a, |
b8698a0f | 2228 | conflict_function **overlaps_b, |
86df10e3 | 2229 | tree *last_conflicts) |
56cf8686 | 2230 | { |
86df10e3 SP |
2231 | bool xz_p, yz_p, xyz_p; |
2232 | int step_x, step_y, step_z; | |
4839cb59 | 2233 | HOST_WIDE_INT niter_x, niter_y, niter_z, niter; |
d93817c4 ZD |
2234 | affine_fn overlaps_a_xz, overlaps_b_xz; |
2235 | affine_fn overlaps_a_yz, overlaps_b_yz; | |
2236 | affine_fn overlaps_a_xyz, overlaps_b_xyz; | |
2237 | affine_fn ova1, ova2, ovb; | |
2238 | tree last_conflicts_xz, last_conflicts_yz, last_conflicts_xyz; | |
86df10e3 | 2239 | |
6b6fa4e9 SP |
2240 | step_x = int_cst_value (CHREC_RIGHT (CHREC_LEFT (chrec_a))); |
2241 | step_y = int_cst_value (CHREC_RIGHT (chrec_a)); | |
2242 | step_z = int_cst_value (CHREC_RIGHT (chrec_b)); | |
86df10e3 | 2243 | |
652c4c71 RG |
2244 | niter_x = max_stmt_executions_int (get_chrec_loop (CHREC_LEFT (chrec_a))); |
2245 | niter_y = max_stmt_executions_int (get_chrec_loop (chrec_a)); | |
2246 | niter_z = max_stmt_executions_int (get_chrec_loop (chrec_b)); | |
b8698a0f | 2247 | |
4839cb59 | 2248 | if (niter_x < 0 || niter_y < 0 || niter_z < 0) |
86df10e3 | 2249 | { |
0ff4040e SP |
2250 | if (dump_file && (dump_flags & TDF_DETAILS)) |
2251 | fprintf (dump_file, "overlap steps test failed: no iteration counts.\n"); | |
b8698a0f | 2252 | |
d93817c4 ZD |
2253 | *overlaps_a = conflict_fn_not_known (); |
2254 | *overlaps_b = conflict_fn_not_known (); | |
86df10e3 SP |
2255 | *last_conflicts = chrec_dont_know; |
2256 | return; | |
2257 | } | |
2258 | ||
86df10e3 SP |
2259 | niter = MIN (niter_x, niter_z); |
2260 | compute_overlap_steps_for_affine_univar (niter, step_x, step_z, | |
2261 | &overlaps_a_xz, | |
2262 | &overlaps_b_xz, | |
2263 | &last_conflicts_xz, 1); | |
2264 | niter = MIN (niter_y, niter_z); | |
2265 | compute_overlap_steps_for_affine_univar (niter, step_y, step_z, | |
2266 | &overlaps_a_yz, | |
2267 | &overlaps_b_yz, | |
2268 | &last_conflicts_yz, 2); | |
2269 | niter = MIN (niter_x, niter_z); | |
2270 | niter = MIN (niter_y, niter); | |
2271 | compute_overlap_steps_for_affine_univar (niter, step_x + step_y, step_z, | |
2272 | &overlaps_a_xyz, | |
2273 | &overlaps_b_xyz, | |
2274 | &last_conflicts_xyz, 3); | |
2275 | ||
2276 | xz_p = !integer_zerop (last_conflicts_xz); | |
2277 | yz_p = !integer_zerop (last_conflicts_yz); | |
2278 | xyz_p = !integer_zerop (last_conflicts_xyz); | |
2279 | ||
2280 | if (xz_p || yz_p || xyz_p) | |
2281 | { | |
d93817c4 ZD |
2282 | ova1 = affine_fn_cst (integer_zero_node); |
2283 | ova2 = affine_fn_cst (integer_zero_node); | |
2284 | ovb = affine_fn_cst (integer_zero_node); | |
86df10e3 SP |
2285 | if (xz_p) |
2286 | { | |
d93817c4 ZD |
2287 | affine_fn t0 = ova1; |
2288 | affine_fn t2 = ovb; | |
2289 | ||
2290 | ova1 = affine_fn_plus (ova1, overlaps_a_xz); | |
2291 | ovb = affine_fn_plus (ovb, overlaps_b_xz); | |
2292 | affine_fn_free (t0); | |
2293 | affine_fn_free (t2); | |
86df10e3 SP |
2294 | *last_conflicts = last_conflicts_xz; |
2295 | } | |
2296 | if (yz_p) | |
2297 | { | |
d93817c4 ZD |
2298 | affine_fn t0 = ova2; |
2299 | affine_fn t2 = ovb; | |
2300 | ||
2301 | ova2 = affine_fn_plus (ova2, overlaps_a_yz); | |
2302 | ovb = affine_fn_plus (ovb, overlaps_b_yz); | |
2303 | affine_fn_free (t0); | |
2304 | affine_fn_free (t2); | |
86df10e3 SP |
2305 | *last_conflicts = last_conflicts_yz; |
2306 | } | |
2307 | if (xyz_p) | |
2308 | { | |
d93817c4 ZD |
2309 | affine_fn t0 = ova1; |
2310 | affine_fn t2 = ova2; | |
2311 | affine_fn t4 = ovb; | |
2312 | ||
2313 | ova1 = affine_fn_plus (ova1, overlaps_a_xyz); | |
2314 | ova2 = affine_fn_plus (ova2, overlaps_a_xyz); | |
2315 | ovb = affine_fn_plus (ovb, overlaps_b_xyz); | |
2316 | affine_fn_free (t0); | |
2317 | affine_fn_free (t2); | |
2318 | affine_fn_free (t4); | |
86df10e3 SP |
2319 | *last_conflicts = last_conflicts_xyz; |
2320 | } | |
d93817c4 ZD |
2321 | *overlaps_a = conflict_fn (2, ova1, ova2); |
2322 | *overlaps_b = conflict_fn (1, ovb); | |
86df10e3 SP |
2323 | } |
2324 | else | |
2325 | { | |
d93817c4 ZD |
2326 | *overlaps_a = conflict_fn (1, affine_fn_cst (integer_zero_node)); |
2327 | *overlaps_b = conflict_fn (1, affine_fn_cst (integer_zero_node)); | |
86df10e3 SP |
2328 | *last_conflicts = integer_zero_node; |
2329 | } | |
d93817c4 ZD |
2330 | |
2331 | affine_fn_free (overlaps_a_xz); | |
2332 | affine_fn_free (overlaps_b_xz); | |
2333 | affine_fn_free (overlaps_a_yz); | |
2334 | affine_fn_free (overlaps_b_yz); | |
2335 | affine_fn_free (overlaps_a_xyz); | |
2336 | affine_fn_free (overlaps_b_xyz); | |
56cf8686 SP |
2337 | } |
2338 | ||
b305e3da SP |
2339 | /* Copy the elements of vector VEC1 with length SIZE to VEC2. */ |
2340 | ||
2341 | static void | |
2342 | lambda_vector_copy (lambda_vector vec1, lambda_vector vec2, | |
2343 | int size) | |
2344 | { | |
2345 | memcpy (vec2, vec1, size * sizeof (*vec1)); | |
2346 | } | |
2347 | ||
2348 | /* Copy the elements of M x N matrix MAT1 to MAT2. */ | |
2349 | ||
2350 | static void | |
2351 | lambda_matrix_copy (lambda_matrix mat1, lambda_matrix mat2, | |
2352 | int m, int n) | |
2353 | { | |
2354 | int i; | |
2355 | ||
2356 | for (i = 0; i < m; i++) | |
2357 | lambda_vector_copy (mat1[i], mat2[i], n); | |
2358 | } | |
2359 | ||
2360 | /* Store the N x N identity matrix in MAT. */ | |
2361 | ||
2362 | static void | |
2363 | lambda_matrix_id (lambda_matrix mat, int size) | |
2364 | { | |
2365 | int i, j; | |
2366 | ||
2367 | for (i = 0; i < size; i++) | |
2368 | for (j = 0; j < size; j++) | |
2369 | mat[i][j] = (i == j) ? 1 : 0; | |
2370 | } | |
2371 | ||
2372 | /* Return the first nonzero element of vector VEC1 between START and N. | |
2373 | We must have START <= N. Returns N if VEC1 is the zero vector. */ | |
2374 | ||
2375 | static int | |
2376 | lambda_vector_first_nz (lambda_vector vec1, int n, int start) | |
2377 | { | |
2378 | int j = start; | |
2379 | while (j < n && vec1[j] == 0) | |
2380 | j++; | |
2381 | return j; | |
2382 | } | |
2383 | ||
2384 | /* Add a multiple of row R1 of matrix MAT with N columns to row R2: | |
2385 | R2 = R2 + CONST1 * R1. */ | |
2386 | ||
2387 | static void | |
2388 | lambda_matrix_row_add (lambda_matrix mat, int n, int r1, int r2, int const1) | |
2389 | { | |
2390 | int i; | |
2391 | ||
2392 | if (const1 == 0) | |
2393 | return; | |
2394 | ||
2395 | for (i = 0; i < n; i++) | |
2396 | mat[r2][i] += const1 * mat[r1][i]; | |
2397 | } | |
2398 | ||
b305e3da SP |
2399 | /* Multiply vector VEC1 of length SIZE by a constant CONST1, |
2400 | and store the result in VEC2. */ | |
2401 | ||
2402 | static void | |
2403 | lambda_vector_mult_const (lambda_vector vec1, lambda_vector vec2, | |
2404 | int size, int const1) | |
2405 | { | |
2406 | int i; | |
2407 | ||
2408 | if (const1 == 0) | |
2409 | lambda_vector_clear (vec2, size); | |
2410 | else | |
2411 | for (i = 0; i < size; i++) | |
2412 | vec2[i] = const1 * vec1[i]; | |
2413 | } | |
2414 | ||
2415 | /* Negate vector VEC1 with length SIZE and store it in VEC2. */ | |
2416 | ||
2417 | static void | |
2418 | lambda_vector_negate (lambda_vector vec1, lambda_vector vec2, | |
2419 | int size) | |
2420 | { | |
2421 | lambda_vector_mult_const (vec1, vec2, size, -1); | |
2422 | } | |
2423 | ||
2424 | /* Negate row R1 of matrix MAT which has N columns. */ | |
2425 | ||
2426 | static void | |
2427 | lambda_matrix_row_negate (lambda_matrix mat, int n, int r1) | |
2428 | { | |
2429 | lambda_vector_negate (mat[r1], mat[r1], n); | |
2430 | } | |
2431 | ||
2432 | /* Return true if two vectors are equal. */ | |
2433 | ||
2434 | static bool | |
2435 | lambda_vector_equal (lambda_vector vec1, lambda_vector vec2, int size) | |
2436 | { | |
2437 | int i; | |
2438 | for (i = 0; i < size; i++) | |
2439 | if (vec1[i] != vec2[i]) | |
2440 | return false; | |
2441 | return true; | |
2442 | } | |
2443 | ||
2444 | /* Given an M x N integer matrix A, this function determines an M x | |
2445 | M unimodular matrix U, and an M x N echelon matrix S such that | |
2446 | "U.A = S". This decomposition is also known as "right Hermite". | |
2447 | ||
2448 | Ref: Algorithm 2.1 page 33 in "Loop Transformations for | |
2449 | Restructuring Compilers" Utpal Banerjee. */ | |
2450 | ||
2451 | static void | |
2452 | lambda_matrix_right_hermite (lambda_matrix A, int m, int n, | |
2453 | lambda_matrix S, lambda_matrix U) | |
2454 | { | |
2455 | int i, j, i0 = 0; | |
2456 | ||
2457 | lambda_matrix_copy (A, S, m, n); | |
2458 | lambda_matrix_id (U, m); | |
2459 | ||
2460 | for (j = 0; j < n; j++) | |
2461 | { | |
2462 | if (lambda_vector_first_nz (S[j], m, i0) < m) | |
2463 | { | |
2464 | ++i0; | |
2465 | for (i = m - 1; i >= i0; i--) | |
2466 | { | |
2467 | while (S[i][j] != 0) | |
2468 | { | |
2469 | int sigma, factor, a, b; | |
2470 | ||
2471 | a = S[i-1][j]; | |
2472 | b = S[i][j]; | |
2473 | sigma = (a * b < 0) ? -1: 1; | |
2474 | a = abs (a); | |
2475 | b = abs (b); | |
2476 | factor = sigma * (a / b); | |
2477 | ||
2478 | lambda_matrix_row_add (S, n, i, i-1, -factor); | |
fab27f52 | 2479 | std::swap (S[i], S[i-1]); |
b305e3da SP |
2480 | |
2481 | lambda_matrix_row_add (U, m, i, i-1, -factor); | |
fab27f52 | 2482 | std::swap (U[i], U[i-1]); |
b305e3da SP |
2483 | } |
2484 | } | |
2485 | } | |
2486 | } | |
2487 | } | |
2488 | ||
56cf8686 | 2489 | /* Determines the overlapping elements due to accesses CHREC_A and |
0ff4040e SP |
2490 | CHREC_B, that are affine functions. This function cannot handle |
2491 | symbolic evolution functions, ie. when initial conditions are | |
2492 | parameters, because it uses lambda matrices of integers. */ | |
56cf8686 SP |
2493 | |
2494 | static void | |
b8698a0f | 2495 | analyze_subscript_affine_affine (tree chrec_a, |
56cf8686 | 2496 | tree chrec_b, |
b8698a0f L |
2497 | conflict_function **overlaps_a, |
2498 | conflict_function **overlaps_b, | |
86df10e3 | 2499 | tree *last_conflicts) |
56cf8686 | 2500 | { |
86df10e3 | 2501 | unsigned nb_vars_a, nb_vars_b, dim; |
fd727b34 | 2502 | HOST_WIDE_INT init_a, init_b, gamma, gcd_alpha_beta; |
86df10e3 | 2503 | lambda_matrix A, U, S; |
f873b205 | 2504 | struct obstack scratch_obstack; |
86df10e3 | 2505 | |
e2157b49 | 2506 | if (eq_evolutions_p (chrec_a, chrec_b)) |
416f403e | 2507 | { |
e2157b49 SP |
2508 | /* The accessed index overlaps for each iteration in the |
2509 | loop. */ | |
d93817c4 ZD |
2510 | *overlaps_a = conflict_fn (1, affine_fn_cst (integer_zero_node)); |
2511 | *overlaps_b = conflict_fn (1, affine_fn_cst (integer_zero_node)); | |
416f403e DB |
2512 | *last_conflicts = chrec_dont_know; |
2513 | return; | |
2514 | } | |
56cf8686 SP |
2515 | if (dump_file && (dump_flags & TDF_DETAILS)) |
2516 | fprintf (dump_file, "(analyze_subscript_affine_affine \n"); | |
b8698a0f | 2517 | |
56cf8686 SP |
2518 | /* For determining the initial intersection, we have to solve a |
2519 | Diophantine equation. This is the most time consuming part. | |
b8698a0f | 2520 | |
56cf8686 SP |
2521 | For answering to the question: "Is there a dependence?" we have |
2522 | to prove that there exists a solution to the Diophantine | |
2523 | equation, and that the solution is in the iteration domain, | |
89dbed81 | 2524 | i.e. the solution is positive or zero, and that the solution |
56cf8686 SP |
2525 | happens before the upper bound loop.nb_iterations. Otherwise |
2526 | there is no dependence. This function outputs a description of | |
2527 | the iterations that hold the intersections. */ | |
2528 | ||
86df10e3 SP |
2529 | nb_vars_a = nb_vars_in_chrec (chrec_a); |
2530 | nb_vars_b = nb_vars_in_chrec (chrec_b); | |
2531 | ||
f873b205 LB |
2532 | gcc_obstack_init (&scratch_obstack); |
2533 | ||
86df10e3 | 2534 | dim = nb_vars_a + nb_vars_b; |
f873b205 LB |
2535 | U = lambda_matrix_new (dim, dim, &scratch_obstack); |
2536 | A = lambda_matrix_new (dim, 1, &scratch_obstack); | |
2537 | S = lambda_matrix_new (dim, 1, &scratch_obstack); | |
86df10e3 | 2538 | |
5b78fc3e JS |
2539 | init_a = int_cst_value (initialize_matrix_A (A, chrec_a, 0, 1)); |
2540 | init_b = int_cst_value (initialize_matrix_A (A, chrec_b, nb_vars_a, -1)); | |
86df10e3 SP |
2541 | gamma = init_b - init_a; |
2542 | ||
2543 | /* Don't do all the hard work of solving the Diophantine equation | |
b8698a0f | 2544 | when we already know the solution: for example, |
86df10e3 SP |
2545 | | {3, +, 1}_1 |
2546 | | {3, +, 4}_2 | |
2547 | | gamma = 3 - 3 = 0. | |
b8698a0f | 2548 | Then the first overlap occurs during the first iterations: |
86df10e3 SP |
2549 | | {3, +, 1}_1 ({0, +, 4}_x) = {3, +, 4}_2 ({0, +, 1}_x) |
2550 | */ | |
2551 | if (gamma == 0) | |
56cf8686 | 2552 | { |
86df10e3 | 2553 | if (nb_vars_a == 1 && nb_vars_b == 1) |
56cf8686 | 2554 | { |
fd727b34 | 2555 | HOST_WIDE_INT step_a, step_b; |
4839cb59 | 2556 | HOST_WIDE_INT niter, niter_a, niter_b; |
d93817c4 | 2557 | affine_fn ova, ovb; |
86df10e3 | 2558 | |
652c4c71 RG |
2559 | niter_a = max_stmt_executions_int (get_chrec_loop (chrec_a)); |
2560 | niter_b = max_stmt_executions_int (get_chrec_loop (chrec_b)); | |
86df10e3 | 2561 | niter = MIN (niter_a, niter_b); |
6b6fa4e9 SP |
2562 | step_a = int_cst_value (CHREC_RIGHT (chrec_a)); |
2563 | step_b = int_cst_value (CHREC_RIGHT (chrec_b)); | |
86df10e3 | 2564 | |
b8698a0f L |
2565 | compute_overlap_steps_for_affine_univar (niter, step_a, step_b, |
2566 | &ova, &ovb, | |
86df10e3 | 2567 | last_conflicts, 1); |
d93817c4 ZD |
2568 | *overlaps_a = conflict_fn (1, ova); |
2569 | *overlaps_b = conflict_fn (1, ovb); | |
56cf8686 | 2570 | } |
86df10e3 SP |
2571 | |
2572 | else if (nb_vars_a == 2 && nb_vars_b == 1) | |
2573 | compute_overlap_steps_for_affine_1_2 | |
2574 | (chrec_a, chrec_b, overlaps_a, overlaps_b, last_conflicts); | |
2575 | ||
2576 | else if (nb_vars_a == 1 && nb_vars_b == 2) | |
2577 | compute_overlap_steps_for_affine_1_2 | |
2578 | (chrec_b, chrec_a, overlaps_b, overlaps_a, last_conflicts); | |
2579 | ||
2580 | else | |
56cf8686 | 2581 | { |
0ff4040e SP |
2582 | if (dump_file && (dump_flags & TDF_DETAILS)) |
2583 | fprintf (dump_file, "affine-affine test failed: too many variables.\n"); | |
d93817c4 ZD |
2584 | *overlaps_a = conflict_fn_not_known (); |
2585 | *overlaps_b = conflict_fn_not_known (); | |
86df10e3 | 2586 | *last_conflicts = chrec_dont_know; |
56cf8686 | 2587 | } |
0ff4040e | 2588 | goto end_analyze_subs_aa; |
86df10e3 SP |
2589 | } |
2590 | ||
2591 | /* U.A = S */ | |
2592 | lambda_matrix_right_hermite (A, dim, 1, S, U); | |
2593 | ||
2594 | if (S[0][0] < 0) | |
2595 | { | |
2596 | S[0][0] *= -1; | |
2597 | lambda_matrix_row_negate (U, dim, 0); | |
2598 | } | |
2599 | gcd_alpha_beta = S[0][0]; | |
2600 | ||
ba42e045 SP |
2601 | /* Something went wrong: for example in {1, +, 0}_5 vs. {0, +, 0}_5, |
2602 | but that is a quite strange case. Instead of ICEing, answer | |
2603 | don't know. */ | |
2604 | if (gcd_alpha_beta == 0) | |
2605 | { | |
d93817c4 ZD |
2606 | *overlaps_a = conflict_fn_not_known (); |
2607 | *overlaps_b = conflict_fn_not_known (); | |
ba42e045 SP |
2608 | *last_conflicts = chrec_dont_know; |
2609 | goto end_analyze_subs_aa; | |
2610 | } | |
2611 | ||
86df10e3 SP |
2612 | /* The classic "gcd-test". */ |
2613 | if (!int_divides_p (gcd_alpha_beta, gamma)) | |
2614 | { | |
2615 | /* The "gcd-test" has determined that there is no integer | |
2616 | solution, i.e. there is no dependence. */ | |
d93817c4 ZD |
2617 | *overlaps_a = conflict_fn_no_dependence (); |
2618 | *overlaps_b = conflict_fn_no_dependence (); | |
86df10e3 SP |
2619 | *last_conflicts = integer_zero_node; |
2620 | } | |
2621 | ||
2622 | /* Both access functions are univariate. This includes SIV and MIV cases. */ | |
2623 | else if (nb_vars_a == 1 && nb_vars_b == 1) | |
2624 | { | |
2625 | /* Both functions should have the same evolution sign. */ | |
2626 | if (((A[0][0] > 0 && -A[1][0] > 0) | |
2627 | || (A[0][0] < 0 && -A[1][0] < 0))) | |
56cf8686 SP |
2628 | { |
2629 | /* The solutions are given by: | |
b8698a0f | 2630 | | |
86df10e3 SP |
2631 | | [GAMMA/GCD_ALPHA_BETA t].[u11 u12] = [x0] |
2632 | | [u21 u22] [y0] | |
b8698a0f | 2633 | |
56cf8686 | 2634 | For a given integer t. Using the following variables, |
b8698a0f | 2635 | |
56cf8686 SP |
2636 | | i0 = u11 * gamma / gcd_alpha_beta |
2637 | | j0 = u12 * gamma / gcd_alpha_beta | |
2638 | | i1 = u21 | |
2639 | | j1 = u22 | |
b8698a0f | 2640 | |
56cf8686 | 2641 | the solutions are: |
b8698a0f L |
2642 | |
2643 | | x0 = i0 + i1 * t, | |
86df10e3 | 2644 | | y0 = j0 + j1 * t. */ |
2c26cbfd | 2645 | HOST_WIDE_INT i0, j0, i1, j1; |
86df10e3 SP |
2646 | |
2647 | i0 = U[0][0] * gamma / gcd_alpha_beta; | |
2648 | j0 = U[0][1] * gamma / gcd_alpha_beta; | |
2649 | i1 = U[1][0]; | |
2650 | j1 = U[1][1]; | |
2651 | ||
2652 | if ((i1 == 0 && i0 < 0) | |
2653 | || (j1 == 0 && j0 < 0)) | |
56cf8686 | 2654 | { |
b8698a0f L |
2655 | /* There is no solution. |
2656 | FIXME: The case "i0 > nb_iterations, j0 > nb_iterations" | |
2657 | falls in here, but for the moment we don't look at the | |
56cf8686 | 2658 | upper bound of the iteration domain. */ |
d93817c4 ZD |
2659 | *overlaps_a = conflict_fn_no_dependence (); |
2660 | *overlaps_b = conflict_fn_no_dependence (); | |
86df10e3 | 2661 | *last_conflicts = integer_zero_node; |
2c26cbfd | 2662 | goto end_analyze_subs_aa; |
86df10e3 SP |
2663 | } |
2664 | ||
2c26cbfd | 2665 | if (i1 > 0 && j1 > 0) |
56cf8686 | 2666 | { |
652c4c71 RG |
2667 | HOST_WIDE_INT niter_a |
2668 | = max_stmt_executions_int (get_chrec_loop (chrec_a)); | |
2669 | HOST_WIDE_INT niter_b | |
2670 | = max_stmt_executions_int (get_chrec_loop (chrec_b)); | |
2c26cbfd SP |
2671 | HOST_WIDE_INT niter = MIN (niter_a, niter_b); |
2672 | ||
2673 | /* (X0, Y0) is a solution of the Diophantine equation: | |
2674 | "chrec_a (X0) = chrec_b (Y0)". */ | |
2675 | HOST_WIDE_INT tau1 = MAX (CEIL (-i0, i1), | |
2676 | CEIL (-j0, j1)); | |
2677 | HOST_WIDE_INT x0 = i1 * tau1 + i0; | |
2678 | HOST_WIDE_INT y0 = j1 * tau1 + j0; | |
2679 | ||
2680 | /* (X1, Y1) is the smallest positive solution of the eq | |
2681 | "chrec_a (X1) = chrec_b (Y1)", i.e. this is where the | |
2682 | first conflict occurs. */ | |
2683 | HOST_WIDE_INT min_multiple = MIN (x0 / i1, y0 / j1); | |
2684 | HOST_WIDE_INT x1 = x0 - i1 * min_multiple; | |
2685 | HOST_WIDE_INT y1 = y0 - j1 * min_multiple; | |
2686 | ||
2687 | if (niter > 0) | |
56cf8686 | 2688 | { |
2c26cbfd SP |
2689 | HOST_WIDE_INT tau2 = MIN (FLOOR_DIV (niter - i0, i1), |
2690 | FLOOR_DIV (niter - j0, j1)); | |
2691 | HOST_WIDE_INT last_conflict = tau2 - (x1 - i0)/i1; | |
86df10e3 | 2692 | |
2c26cbfd SP |
2693 | /* If the overlap occurs outside of the bounds of the |
2694 | loop, there is no dependence. */ | |
9e517d61 | 2695 | if (x1 >= niter || y1 >= niter) |
56cf8686 | 2696 | { |
2c26cbfd SP |
2697 | *overlaps_a = conflict_fn_no_dependence (); |
2698 | *overlaps_b = conflict_fn_no_dependence (); | |
2699 | *last_conflicts = integer_zero_node; | |
2700 | goto end_analyze_subs_aa; | |
56cf8686 SP |
2701 | } |
2702 | else | |
2c26cbfd | 2703 | *last_conflicts = build_int_cst (NULL_TREE, last_conflict); |
56cf8686 | 2704 | } |
56cf8686 | 2705 | else |
2c26cbfd SP |
2706 | *last_conflicts = chrec_dont_know; |
2707 | ||
2708 | *overlaps_a | |
2709 | = conflict_fn (1, | |
2710 | affine_fn_univar (build_int_cst (NULL_TREE, x1), | |
2711 | 1, | |
2712 | build_int_cst (NULL_TREE, i1))); | |
2713 | *overlaps_b | |
2714 | = conflict_fn (1, | |
2715 | affine_fn_univar (build_int_cst (NULL_TREE, y1), | |
2716 | 1, | |
2717 | build_int_cst (NULL_TREE, j1))); | |
2718 | } | |
2719 | else | |
2720 | { | |
2721 | /* FIXME: For the moment, the upper bound of the | |
2722 | iteration domain for i and j is not checked. */ | |
2723 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
2724 | fprintf (dump_file, "affine-affine test failed: unimplemented.\n"); | |
2725 | *overlaps_a = conflict_fn_not_known (); | |
2726 | *overlaps_b = conflict_fn_not_known (); | |
2727 | *last_conflicts = chrec_dont_know; | |
56cf8686 SP |
2728 | } |
2729 | } | |
86df10e3 SP |
2730 | else |
2731 | { | |
0ff4040e SP |
2732 | if (dump_file && (dump_flags & TDF_DETAILS)) |
2733 | fprintf (dump_file, "affine-affine test failed: unimplemented.\n"); | |
d93817c4 ZD |
2734 | *overlaps_a = conflict_fn_not_known (); |
2735 | *overlaps_b = conflict_fn_not_known (); | |
86df10e3 SP |
2736 | *last_conflicts = chrec_dont_know; |
2737 | } | |
56cf8686 | 2738 | } |
56cf8686 SP |
2739 | else |
2740 | { | |
0ff4040e SP |
2741 | if (dump_file && (dump_flags & TDF_DETAILS)) |
2742 | fprintf (dump_file, "affine-affine test failed: unimplemented.\n"); | |
d93817c4 ZD |
2743 | *overlaps_a = conflict_fn_not_known (); |
2744 | *overlaps_b = conflict_fn_not_known (); | |
86df10e3 | 2745 | *last_conflicts = chrec_dont_know; |
56cf8686 | 2746 | } |
86df10e3 | 2747 | |
b8698a0f | 2748 | end_analyze_subs_aa: |
f873b205 | 2749 | obstack_free (&scratch_obstack, NULL); |
56cf8686 SP |
2750 | if (dump_file && (dump_flags & TDF_DETAILS)) |
2751 | { | |
2752 | fprintf (dump_file, " (overlaps_a = "); | |
d93817c4 | 2753 | dump_conflict_function (dump_file, *overlaps_a); |
56cf8686 | 2754 | fprintf (dump_file, ")\n (overlaps_b = "); |
d93817c4 | 2755 | dump_conflict_function (dump_file, *overlaps_b); |
bcf1ef00 | 2756 | fprintf (dump_file, "))\n"); |
56cf8686 | 2757 | } |
0ff4040e SP |
2758 | } |
2759 | ||
2760 | /* Returns true when analyze_subscript_affine_affine can be used for | |
2761 | determining the dependence relation between chrec_a and chrec_b, | |
2762 | that contain symbols. This function modifies chrec_a and chrec_b | |
2763 | such that the analysis result is the same, and such that they don't | |
b8698a0f | 2764 | contain symbols, and then can safely be passed to the analyzer. |
0ff4040e SP |
2765 | |
2766 | Example: The analysis of the following tuples of evolutions produce | |
2767 | the same results: {x+1, +, 1}_1 vs. {x+3, +, 1}_1, and {-2, +, 1}_1 | |
2768 | vs. {0, +, 1}_1 | |
b8698a0f | 2769 | |
0ff4040e SP |
2770 | {x+1, +, 1}_1 ({2, +, 1}_1) = {x+3, +, 1}_1 ({0, +, 1}_1) |
2771 | {-2, +, 1}_1 ({2, +, 1}_1) = {0, +, 1}_1 ({0, +, 1}_1) | |
2772 | */ | |
2773 | ||
2774 | static bool | |
2775 | can_use_analyze_subscript_affine_affine (tree *chrec_a, tree *chrec_b) | |
2776 | { | |
16a2acea | 2777 | tree diff, type, left_a, left_b, right_b; |
0ff4040e SP |
2778 | |
2779 | if (chrec_contains_symbols (CHREC_RIGHT (*chrec_a)) | |
2780 | || chrec_contains_symbols (CHREC_RIGHT (*chrec_b))) | |
2781 | /* FIXME: For the moment not handled. Might be refined later. */ | |
2782 | return false; | |
2783 | ||
16a2acea SP |
2784 | type = chrec_type (*chrec_a); |
2785 | left_a = CHREC_LEFT (*chrec_a); | |
726a989a | 2786 | left_b = chrec_convert (type, CHREC_LEFT (*chrec_b), NULL); |
16a2acea SP |
2787 | diff = chrec_fold_minus (type, left_a, left_b); |
2788 | ||
0ff4040e SP |
2789 | if (!evolution_function_is_constant_p (diff)) |
2790 | return false; | |
2791 | ||
56cf8686 | 2792 | if (dump_file && (dump_flags & TDF_DETAILS)) |
0ff4040e SP |
2793 | fprintf (dump_file, "can_use_subscript_aff_aff_for_symbolic \n"); |
2794 | ||
b8698a0f | 2795 | *chrec_a = build_polynomial_chrec (CHREC_VARIABLE (*chrec_a), |
0ff4040e | 2796 | diff, CHREC_RIGHT (*chrec_a)); |
726a989a | 2797 | right_b = chrec_convert (type, CHREC_RIGHT (*chrec_b), NULL); |
0ff4040e | 2798 | *chrec_b = build_polynomial_chrec (CHREC_VARIABLE (*chrec_b), |
dc61cc6b | 2799 | build_int_cst (type, 0), |
16a2acea | 2800 | right_b); |
0ff4040e | 2801 | return true; |
56cf8686 SP |
2802 | } |
2803 | ||
2804 | /* Analyze a SIV (Single Index Variable) subscript. *OVERLAPS_A and | |
2805 | *OVERLAPS_B are initialized to the functions that describe the | |
2806 | relation between the elements accessed twice by CHREC_A and | |
2807 | CHREC_B. For k >= 0, the following property is verified: | |
2808 | ||
2809 | CHREC_A (*OVERLAPS_A (k)) = CHREC_B (*OVERLAPS_B (k)). */ | |
2810 | ||
2811 | static void | |
b8698a0f | 2812 | analyze_siv_subscript (tree chrec_a, |
56cf8686 | 2813 | tree chrec_b, |
b8698a0f L |
2814 | conflict_function **overlaps_a, |
2815 | conflict_function **overlaps_b, | |
5b78fc3e JS |
2816 | tree *last_conflicts, |
2817 | int loop_nest_num) | |
56cf8686 | 2818 | { |
0ff4040e | 2819 | dependence_stats.num_siv++; |
b8698a0f | 2820 | |
56cf8686 SP |
2821 | if (dump_file && (dump_flags & TDF_DETAILS)) |
2822 | fprintf (dump_file, "(analyze_siv_subscript \n"); | |
b8698a0f | 2823 | |
56cf8686 | 2824 | if (evolution_function_is_constant_p (chrec_a) |
5b78fc3e | 2825 | && evolution_function_is_affine_in_loop (chrec_b, loop_nest_num)) |
b8698a0f | 2826 | analyze_siv_subscript_cst_affine (chrec_a, chrec_b, |
86df10e3 | 2827 | overlaps_a, overlaps_b, last_conflicts); |
b8698a0f | 2828 | |
5b78fc3e | 2829 | else if (evolution_function_is_affine_in_loop (chrec_a, loop_nest_num) |
56cf8686 | 2830 | && evolution_function_is_constant_p (chrec_b)) |
b8698a0f | 2831 | analyze_siv_subscript_cst_affine (chrec_b, chrec_a, |
86df10e3 | 2832 | overlaps_b, overlaps_a, last_conflicts); |
b8698a0f | 2833 | |
5b78fc3e JS |
2834 | else if (evolution_function_is_affine_in_loop (chrec_a, loop_nest_num) |
2835 | && evolution_function_is_affine_in_loop (chrec_b, loop_nest_num)) | |
0ff4040e SP |
2836 | { |
2837 | if (!chrec_contains_symbols (chrec_a) | |
2838 | && !chrec_contains_symbols (chrec_b)) | |
2839 | { | |
b8698a0f L |
2840 | analyze_subscript_affine_affine (chrec_a, chrec_b, |
2841 | overlaps_a, overlaps_b, | |
0ff4040e SP |
2842 | last_conflicts); |
2843 | ||
d93817c4 ZD |
2844 | if (CF_NOT_KNOWN_P (*overlaps_a) |
2845 | || CF_NOT_KNOWN_P (*overlaps_b)) | |
0ff4040e | 2846 | dependence_stats.num_siv_unimplemented++; |
d93817c4 ZD |
2847 | else if (CF_NO_DEPENDENCE_P (*overlaps_a) |
2848 | || CF_NO_DEPENDENCE_P (*overlaps_b)) | |
0ff4040e SP |
2849 | dependence_stats.num_siv_independent++; |
2850 | else | |
2851 | dependence_stats.num_siv_dependent++; | |
2852 | } | |
b8698a0f | 2853 | else if (can_use_analyze_subscript_affine_affine (&chrec_a, |
0ff4040e SP |
2854 | &chrec_b)) |
2855 | { | |
b8698a0f L |
2856 | analyze_subscript_affine_affine (chrec_a, chrec_b, |
2857 | overlaps_a, overlaps_b, | |
0ff4040e | 2858 | last_conflicts); |
0ff4040e | 2859 | |
d93817c4 ZD |
2860 | if (CF_NOT_KNOWN_P (*overlaps_a) |
2861 | || CF_NOT_KNOWN_P (*overlaps_b)) | |
0ff4040e | 2862 | dependence_stats.num_siv_unimplemented++; |
d93817c4 ZD |
2863 | else if (CF_NO_DEPENDENCE_P (*overlaps_a) |
2864 | || CF_NO_DEPENDENCE_P (*overlaps_b)) | |
0ff4040e SP |
2865 | dependence_stats.num_siv_independent++; |
2866 | else | |
2867 | dependence_stats.num_siv_dependent++; | |
2868 | } | |
2869 | else | |
2870 | goto siv_subscript_dontknow; | |
2871 | } | |
2872 | ||
56cf8686 SP |
2873 | else |
2874 | { | |
0ff4040e SP |
2875 | siv_subscript_dontknow:; |
2876 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
bcf1ef00 | 2877 | fprintf (dump_file, " siv test failed: unimplemented"); |
d93817c4 ZD |
2878 | *overlaps_a = conflict_fn_not_known (); |
2879 | *overlaps_b = conflict_fn_not_known (); | |
86df10e3 | 2880 | *last_conflicts = chrec_dont_know; |
0ff4040e | 2881 | dependence_stats.num_siv_unimplemented++; |
56cf8686 | 2882 | } |
b8698a0f | 2883 | |
56cf8686 SP |
2884 | if (dump_file && (dump_flags & TDF_DETAILS)) |
2885 | fprintf (dump_file, ")\n"); | |
2886 | } | |
2887 | ||
55a700ac ZD |
2888 | /* Returns false if we can prove that the greatest common divisor of the steps |
2889 | of CHREC does not divide CST, false otherwise. */ | |
56cf8686 SP |
2890 | |
2891 | static bool | |
ed7a4b4b | 2892 | gcd_of_steps_may_divide_p (const_tree chrec, const_tree cst) |
56cf8686 | 2893 | { |
55a700ac ZD |
2894 | HOST_WIDE_INT cd = 0, val; |
2895 | tree step; | |
0ff4040e | 2896 | |
9541ffee | 2897 | if (!tree_fits_shwi_p (cst)) |
55a700ac | 2898 | return true; |
9439e9a1 | 2899 | val = tree_to_shwi (cst); |
55a700ac ZD |
2900 | |
2901 | while (TREE_CODE (chrec) == POLYNOMIAL_CHREC) | |
2902 | { | |
2903 | step = CHREC_RIGHT (chrec); | |
9541ffee | 2904 | if (!tree_fits_shwi_p (step)) |
55a700ac | 2905 | return true; |
9439e9a1 | 2906 | cd = gcd (cd, tree_to_shwi (step)); |
55a700ac | 2907 | chrec = CHREC_LEFT (chrec); |
56cf8686 | 2908 | } |
55a700ac ZD |
2909 | |
2910 | return val % cd == 0; | |
56cf8686 SP |
2911 | } |
2912 | ||
da9a21f4 SP |
2913 | /* Analyze a MIV (Multiple Index Variable) subscript with respect to |
2914 | LOOP_NEST. *OVERLAPS_A and *OVERLAPS_B are initialized to the | |
2915 | functions that describe the relation between the elements accessed | |
2916 | twice by CHREC_A and CHREC_B. For k >= 0, the following property | |
2917 | is verified: | |
56cf8686 SP |
2918 | |
2919 | CHREC_A (*OVERLAPS_A (k)) = CHREC_B (*OVERLAPS_B (k)). */ | |
2920 | ||
2921 | static void | |
b8698a0f L |
2922 | analyze_miv_subscript (tree chrec_a, |
2923 | tree chrec_b, | |
2924 | conflict_function **overlaps_a, | |
2925 | conflict_function **overlaps_b, | |
da9a21f4 SP |
2926 | tree *last_conflicts, |
2927 | struct loop *loop_nest) | |
56cf8686 | 2928 | { |
33b30201 SP |
2929 | tree type, difference; |
2930 | ||
0ff4040e | 2931 | dependence_stats.num_miv++; |
56cf8686 SP |
2932 | if (dump_file && (dump_flags & TDF_DETAILS)) |
2933 | fprintf (dump_file, "(analyze_miv_subscript \n"); | |
e2157b49 | 2934 | |
33b30201 | 2935 | type = signed_type_for_types (TREE_TYPE (chrec_a), TREE_TYPE (chrec_b)); |
726a989a RB |
2936 | chrec_a = chrec_convert (type, chrec_a, NULL); |
2937 | chrec_b = chrec_convert (type, chrec_b, NULL); | |
33b30201 | 2938 | difference = chrec_fold_minus (type, chrec_a, chrec_b); |
b8698a0f | 2939 | |
e2157b49 | 2940 | if (eq_evolutions_p (chrec_a, chrec_b)) |
56cf8686 SP |
2941 | { |
2942 | /* Access functions are the same: all the elements are accessed | |
2943 | in the same order. */ | |
d93817c4 ZD |
2944 | *overlaps_a = conflict_fn (1, affine_fn_cst (integer_zero_node)); |
2945 | *overlaps_b = conflict_fn (1, affine_fn_cst (integer_zero_node)); | |
b4a9343c | 2946 | *last_conflicts = max_stmt_executions_tree (get_chrec_loop (chrec_a)); |
0ff4040e | 2947 | dependence_stats.num_miv_dependent++; |
56cf8686 | 2948 | } |
b8698a0f | 2949 | |
56cf8686 SP |
2950 | else if (evolution_function_is_constant_p (difference) |
2951 | /* For the moment, the following is verified: | |
da9a21f4 SP |
2952 | evolution_function_is_affine_multivariate_p (chrec_a, |
2953 | loop_nest->num) */ | |
55a700ac | 2954 | && !gcd_of_steps_may_divide_p (chrec_a, difference)) |
56cf8686 SP |
2955 | { |
2956 | /* testsuite/.../ssa-chrec-33.c | |
b8698a0f L |
2957 | {{21, +, 2}_1, +, -2}_2 vs. {{20, +, 2}_1, +, -2}_2 |
2958 | ||
55a700ac ZD |
2959 | The difference is 1, and all the evolution steps are multiples |
2960 | of 2, consequently there are no overlapping elements. */ | |
d93817c4 ZD |
2961 | *overlaps_a = conflict_fn_no_dependence (); |
2962 | *overlaps_b = conflict_fn_no_dependence (); | |
86df10e3 | 2963 | *last_conflicts = integer_zero_node; |
0ff4040e | 2964 | dependence_stats.num_miv_independent++; |
56cf8686 | 2965 | } |
b8698a0f | 2966 | |
da9a21f4 | 2967 | else if (evolution_function_is_affine_multivariate_p (chrec_a, loop_nest->num) |
0ff4040e | 2968 | && !chrec_contains_symbols (chrec_a) |
da9a21f4 | 2969 | && evolution_function_is_affine_multivariate_p (chrec_b, loop_nest->num) |
0ff4040e | 2970 | && !chrec_contains_symbols (chrec_b)) |
56cf8686 SP |
2971 | { |
2972 | /* testsuite/.../ssa-chrec-35.c | |
2973 | {0, +, 1}_2 vs. {0, +, 1}_3 | |
2974 | the overlapping elements are respectively located at iterations: | |
b8698a0f L |
2975 | {0, +, 1}_x and {0, +, 1}_x, |
2976 | in other words, we have the equality: | |
86df10e3 | 2977 | {0, +, 1}_2 ({0, +, 1}_x) = {0, +, 1}_3 ({0, +, 1}_x) |
b8698a0f L |
2978 | |
2979 | Other examples: | |
2980 | {{0, +, 1}_1, +, 2}_2 ({0, +, 1}_x, {0, +, 1}_y) = | |
86df10e3 SP |
2981 | {0, +, 1}_1 ({{0, +, 1}_x, +, 2}_y) |
2982 | ||
b8698a0f | 2983 | {{0, +, 2}_1, +, 3}_2 ({0, +, 1}_y, {0, +, 1}_x) = |
86df10e3 | 2984 | {{0, +, 3}_1, +, 2}_2 ({0, +, 1}_x, {0, +, 1}_y) |
56cf8686 | 2985 | */ |
b8698a0f | 2986 | analyze_subscript_affine_affine (chrec_a, chrec_b, |
86df10e3 | 2987 | overlaps_a, overlaps_b, last_conflicts); |
0ff4040e | 2988 | |
d93817c4 ZD |
2989 | if (CF_NOT_KNOWN_P (*overlaps_a) |
2990 | || CF_NOT_KNOWN_P (*overlaps_b)) | |
0ff4040e | 2991 | dependence_stats.num_miv_unimplemented++; |
d93817c4 ZD |
2992 | else if (CF_NO_DEPENDENCE_P (*overlaps_a) |
2993 | || CF_NO_DEPENDENCE_P (*overlaps_b)) | |
0ff4040e SP |
2994 | dependence_stats.num_miv_independent++; |
2995 | else | |
2996 | dependence_stats.num_miv_dependent++; | |
56cf8686 | 2997 | } |
b8698a0f | 2998 | |
56cf8686 SP |
2999 | else |
3000 | { | |
3001 | /* When the analysis is too difficult, answer "don't know". */ | |
0ff4040e SP |
3002 | if (dump_file && (dump_flags & TDF_DETAILS)) |
3003 | fprintf (dump_file, "analyze_miv_subscript test failed: unimplemented.\n"); | |
3004 | ||
d93817c4 ZD |
3005 | *overlaps_a = conflict_fn_not_known (); |
3006 | *overlaps_b = conflict_fn_not_known (); | |
86df10e3 | 3007 | *last_conflicts = chrec_dont_know; |
0ff4040e | 3008 | dependence_stats.num_miv_unimplemented++; |
56cf8686 | 3009 | } |
b8698a0f | 3010 | |
56cf8686 SP |
3011 | if (dump_file && (dump_flags & TDF_DETAILS)) |
3012 | fprintf (dump_file, ")\n"); | |
3013 | } | |
3014 | ||
da9a21f4 SP |
3015 | /* Determines the iterations for which CHREC_A is equal to CHREC_B in |
3016 | with respect to LOOP_NEST. OVERLAP_ITERATIONS_A and | |
3017 | OVERLAP_ITERATIONS_B are initialized with two functions that | |
3018 | describe the iterations that contain conflicting elements. | |
b8698a0f | 3019 | |
56cf8686 | 3020 | Remark: For an integer k >= 0, the following equality is true: |
b8698a0f | 3021 | |
56cf8686 SP |
3022 | CHREC_A (OVERLAP_ITERATIONS_A (k)) == CHREC_B (OVERLAP_ITERATIONS_B (k)). |
3023 | */ | |
3024 | ||
b8698a0f L |
3025 | static void |
3026 | analyze_overlapping_iterations (tree chrec_a, | |
3027 | tree chrec_b, | |
3028 | conflict_function **overlap_iterations_a, | |
3029 | conflict_function **overlap_iterations_b, | |
da9a21f4 | 3030 | tree *last_conflicts, struct loop *loop_nest) |
56cf8686 | 3031 | { |
da9a21f4 SP |
3032 | unsigned int lnn = loop_nest->num; |
3033 | ||
0ff4040e | 3034 | dependence_stats.num_subscript_tests++; |
b8698a0f | 3035 | |
56cf8686 SP |
3036 | if (dump_file && (dump_flags & TDF_DETAILS)) |
3037 | { | |
3038 | fprintf (dump_file, "(analyze_overlapping_iterations \n"); | |
3039 | fprintf (dump_file, " (chrec_a = "); | |
3040 | print_generic_expr (dump_file, chrec_a, 0); | |
0ff4040e | 3041 | fprintf (dump_file, ")\n (chrec_b = "); |
56cf8686 SP |
3042 | print_generic_expr (dump_file, chrec_b, 0); |
3043 | fprintf (dump_file, ")\n"); | |
3044 | } | |
0ff4040e | 3045 | |
56cf8686 SP |
3046 | if (chrec_a == NULL_TREE |
3047 | || chrec_b == NULL_TREE | |
3048 | || chrec_contains_undetermined (chrec_a) | |
0ff4040e | 3049 | || chrec_contains_undetermined (chrec_b)) |
56cf8686 | 3050 | { |
0ff4040e | 3051 | dependence_stats.num_subscript_undetermined++; |
b8698a0f | 3052 | |
d93817c4 ZD |
3053 | *overlap_iterations_a = conflict_fn_not_known (); |
3054 | *overlap_iterations_b = conflict_fn_not_known (); | |
56cf8686 | 3055 | } |
0ff4040e | 3056 | |
b8698a0f | 3057 | /* If they are the same chrec, and are affine, they overlap |
0ff4040e SP |
3058 | on every iteration. */ |
3059 | else if (eq_evolutions_p (chrec_a, chrec_b) | |
3e6f8b56 SP |
3060 | && (evolution_function_is_affine_multivariate_p (chrec_a, lnn) |
3061 | || operand_equal_p (chrec_a, chrec_b, 0))) | |
0ff4040e SP |
3062 | { |
3063 | dependence_stats.num_same_subscript_function++; | |
d93817c4 ZD |
3064 | *overlap_iterations_a = conflict_fn (1, affine_fn_cst (integer_zero_node)); |
3065 | *overlap_iterations_b = conflict_fn (1, affine_fn_cst (integer_zero_node)); | |
0ff4040e SP |
3066 | *last_conflicts = chrec_dont_know; |
3067 | } | |
3068 | ||
3069 | /* If they aren't the same, and aren't affine, we can't do anything | |
3e6f8b56 | 3070 | yet. */ |
b8698a0f | 3071 | else if ((chrec_contains_symbols (chrec_a) |
0ff4040e | 3072 | || chrec_contains_symbols (chrec_b)) |
da9a21f4 SP |
3073 | && (!evolution_function_is_affine_multivariate_p (chrec_a, lnn) |
3074 | || !evolution_function_is_affine_multivariate_p (chrec_b, lnn))) | |
0ff4040e SP |
3075 | { |
3076 | dependence_stats.num_subscript_undetermined++; | |
d93817c4 ZD |
3077 | *overlap_iterations_a = conflict_fn_not_known (); |
3078 | *overlap_iterations_b = conflict_fn_not_known (); | |
0ff4040e SP |
3079 | } |
3080 | ||
56cf8686 | 3081 | else if (ziv_subscript_p (chrec_a, chrec_b)) |
b8698a0f | 3082 | analyze_ziv_subscript (chrec_a, chrec_b, |
86df10e3 SP |
3083 | overlap_iterations_a, overlap_iterations_b, |
3084 | last_conflicts); | |
b8698a0f | 3085 | |
56cf8686 | 3086 | else if (siv_subscript_p (chrec_a, chrec_b)) |
b8698a0f L |
3087 | analyze_siv_subscript (chrec_a, chrec_b, |
3088 | overlap_iterations_a, overlap_iterations_b, | |
5b78fc3e | 3089 | last_conflicts, lnn); |
b8698a0f | 3090 | |
56cf8686 | 3091 | else |
b8698a0f | 3092 | analyze_miv_subscript (chrec_a, chrec_b, |
86df10e3 | 3093 | overlap_iterations_a, overlap_iterations_b, |
da9a21f4 | 3094 | last_conflicts, loop_nest); |
b8698a0f | 3095 | |
56cf8686 SP |
3096 | if (dump_file && (dump_flags & TDF_DETAILS)) |
3097 | { | |
3098 | fprintf (dump_file, " (overlap_iterations_a = "); | |
d93817c4 | 3099 | dump_conflict_function (dump_file, *overlap_iterations_a); |
56cf8686 | 3100 | fprintf (dump_file, ")\n (overlap_iterations_b = "); |
d93817c4 | 3101 | dump_conflict_function (dump_file, *overlap_iterations_b); |
bcf1ef00 | 3102 | fprintf (dump_file, "))\n"); |
56cf8686 SP |
3103 | } |
3104 | } | |
3105 | ||
ba42e045 | 3106 | /* Helper function for uniquely inserting distance vectors. */ |
56cf8686 | 3107 | |
ba42e045 SP |
3108 | static void |
3109 | save_dist_v (struct data_dependence_relation *ddr, lambda_vector dist_v) | |
3110 | { | |
3111 | unsigned i; | |
3112 | lambda_vector v; | |
56cf8686 | 3113 | |
9771b263 | 3114 | FOR_EACH_VEC_ELT (DDR_DIST_VECTS (ddr), i, v) |
ba42e045 SP |
3115 | if (lambda_vector_equal (v, dist_v, DDR_NB_LOOPS (ddr))) |
3116 | return; | |
56cf8686 | 3117 | |
9771b263 | 3118 | DDR_DIST_VECTS (ddr).safe_push (dist_v); |
ba42e045 | 3119 | } |
56cf8686 | 3120 | |
ba42e045 SP |
3121 | /* Helper function for uniquely inserting direction vectors. */ |
3122 | ||
3123 | static void | |
3124 | save_dir_v (struct data_dependence_relation *ddr, lambda_vector dir_v) | |
56cf8686 SP |
3125 | { |
3126 | unsigned i; | |
ba42e045 | 3127 | lambda_vector v; |
0ff4040e | 3128 | |
9771b263 | 3129 | FOR_EACH_VEC_ELT (DDR_DIR_VECTS (ddr), i, v) |
ba42e045 SP |
3130 | if (lambda_vector_equal (v, dir_v, DDR_NB_LOOPS (ddr))) |
3131 | return; | |
3132 | ||
9771b263 | 3133 | DDR_DIR_VECTS (ddr).safe_push (dir_v); |
ba42e045 SP |
3134 | } |
3135 | ||
3136 | /* Add a distance of 1 on all the loops outer than INDEX. If we | |
3137 | haven't yet determined a distance for this outer loop, push a new | |
3138 | distance vector composed of the previous distance, and a distance | |
3139 | of 1 for this outer loop. Example: | |
3140 | ||
3141 | | loop_1 | |
3142 | | loop_2 | |
3143 | | A[10] | |
3144 | | endloop_2 | |
3145 | | endloop_1 | |
3146 | ||
3147 | Saved vectors are of the form (dist_in_1, dist_in_2). First, we | |
3148 | save (0, 1), then we have to save (1, 0). */ | |
3149 | ||
3150 | static void | |
3151 | add_outer_distances (struct data_dependence_relation *ddr, | |
3152 | lambda_vector dist_v, int index) | |
3153 | { | |
3154 | /* For each outer loop where init_v is not set, the accesses are | |
3155 | in dependence of distance 1 in the loop. */ | |
3156 | while (--index >= 0) | |
3157 | { | |
3158 | lambda_vector save_v = lambda_vector_new (DDR_NB_LOOPS (ddr)); | |
3159 | lambda_vector_copy (dist_v, save_v, DDR_NB_LOOPS (ddr)); | |
3160 | save_v[index] = 1; | |
3161 | save_dist_v (ddr, save_v); | |
3162 | } | |
3163 | } | |
3164 | ||
3165 | /* Return false when fail to represent the data dependence as a | |
3166 | distance vector. INIT_B is set to true when a component has been | |
3167 | added to the distance vector DIST_V. INDEX_CARRY is then set to | |
3168 | the index in DIST_V that carries the dependence. */ | |
3169 | ||
3170 | static bool | |
3171 | build_classic_dist_vector_1 (struct data_dependence_relation *ddr, | |
3172 | struct data_reference *ddr_a, | |
3173 | struct data_reference *ddr_b, | |
3174 | lambda_vector dist_v, bool *init_b, | |
3175 | int *index_carry) | |
3176 | { | |
3177 | unsigned i; | |
3178 | lambda_vector init_v = lambda_vector_new (DDR_NB_LOOPS (ddr)); | |
0ff4040e | 3179 | |
36d59cf7 | 3180 | for (i = 0; i < DDR_NUM_SUBSCRIPTS (ddr); i++) |
56cf8686 | 3181 | { |
86df10e3 | 3182 | tree access_fn_a, access_fn_b; |
36d59cf7 | 3183 | struct subscript *subscript = DDR_SUBSCRIPT (ddr, i); |
56cf8686 SP |
3184 | |
3185 | if (chrec_contains_undetermined (SUB_DISTANCE (subscript))) | |
86df10e3 SP |
3186 | { |
3187 | non_affine_dependence_relation (ddr); | |
ba42e045 | 3188 | return false; |
86df10e3 SP |
3189 | } |
3190 | ||
ba42e045 SP |
3191 | access_fn_a = DR_ACCESS_FN (ddr_a, i); |
3192 | access_fn_b = DR_ACCESS_FN (ddr_b, i); | |
56cf8686 | 3193 | |
b8698a0f | 3194 | if (TREE_CODE (access_fn_a) == POLYNOMIAL_CHREC |
86df10e3 | 3195 | && TREE_CODE (access_fn_b) == POLYNOMIAL_CHREC) |
56cf8686 | 3196 | { |
ba42e045 | 3197 | int dist, index; |
a130584a SP |
3198 | int var_a = CHREC_VARIABLE (access_fn_a); |
3199 | int var_b = CHREC_VARIABLE (access_fn_b); | |
ba42e045 | 3200 | |
a130584a SP |
3201 | if (var_a != var_b |
3202 | || chrec_contains_undetermined (SUB_DISTANCE (subscript))) | |
86df10e3 SP |
3203 | { |
3204 | non_affine_dependence_relation (ddr); | |
ba42e045 | 3205 | return false; |
86df10e3 | 3206 | } |
b8698a0f | 3207 | |
6b6fa4e9 | 3208 | dist = int_cst_value (SUB_DISTANCE (subscript)); |
a130584a SP |
3209 | index = index_in_loop_nest (var_a, DDR_LOOP_NEST (ddr)); |
3210 | *index_carry = MIN (index, *index_carry); | |
56cf8686 | 3211 | |
ba42e045 SP |
3212 | /* This is the subscript coupling test. If we have already |
3213 | recorded a distance for this loop (a distance coming from | |
3214 | another subscript), it should be the same. For example, | |
3215 | in the following code, there is no dependence: | |
3216 | ||
56cf8686 SP |
3217 | | loop i = 0, N, 1 |
3218 | | T[i+1][i] = ... | |
3219 | | ... = T[i][i] | |
3220 | | endloop | |
ba42e045 SP |
3221 | */ |
3222 | if (init_v[index] != 0 && dist_v[index] != dist) | |
56cf8686 | 3223 | { |
36d59cf7 | 3224 | finalize_ddr_dependent (ddr, chrec_known); |
ba42e045 | 3225 | return false; |
56cf8686 SP |
3226 | } |
3227 | ||
ba42e045 SP |
3228 | dist_v[index] = dist; |
3229 | init_v[index] = 1; | |
3230 | *init_b = true; | |
3231 | } | |
a50411de | 3232 | else if (!operand_equal_p (access_fn_a, access_fn_b, 0)) |
ba42e045 SP |
3233 | { |
3234 | /* This can be for example an affine vs. constant dependence | |
3235 | (T[i] vs. T[3]) that is not an affine dependence and is | |
3236 | not representable as a distance vector. */ | |
3237 | non_affine_dependence_relation (ddr); | |
3238 | return false; | |
56cf8686 SP |
3239 | } |
3240 | } | |
304afda6 | 3241 | |
ba42e045 SP |
3242 | return true; |
3243 | } | |
304afda6 | 3244 | |
1baf2906 SP |
3245 | /* Return true when the DDR contains only constant access functions. */ |
3246 | ||
3247 | static bool | |
ed7a4b4b | 3248 | constant_access_functions (const struct data_dependence_relation *ddr) |
1baf2906 SP |
3249 | { |
3250 | unsigned i; | |
3251 | ||
3252 | for (i = 0; i < DDR_NUM_SUBSCRIPTS (ddr); i++) | |
3253 | if (!evolution_function_is_constant_p (DR_ACCESS_FN (DDR_A (ddr), i)) | |
3254 | || !evolution_function_is_constant_p (DR_ACCESS_FN (DDR_B (ddr), i))) | |
3255 | return false; | |
3256 | ||
3257 | return true; | |
3258 | } | |
3259 | ||
ba42e045 | 3260 | /* Helper function for the case where DDR_A and DDR_B are the same |
097392de SP |
3261 | multivariate access function with a constant step. For an example |
3262 | see pr34635-1.c. */ | |
86df10e3 | 3263 | |
ba42e045 SP |
3264 | static void |
3265 | add_multivariate_self_dist (struct data_dependence_relation *ddr, tree c_2) | |
3266 | { | |
3267 | int x_1, x_2; | |
3268 | tree c_1 = CHREC_LEFT (c_2); | |
3269 | tree c_0 = CHREC_LEFT (c_1); | |
3270 | lambda_vector dist_v; | |
0ca2faee | 3271 | int v1, v2, cd; |
86df10e3 | 3272 | |
b1e75954 SP |
3273 | /* Polynomials with more than 2 variables are not handled yet. When |
3274 | the evolution steps are parameters, it is not possible to | |
3275 | represent the dependence using classical distance vectors. */ | |
3276 | if (TREE_CODE (c_0) != INTEGER_CST | |
3277 | || TREE_CODE (CHREC_RIGHT (c_1)) != INTEGER_CST | |
3278 | || TREE_CODE (CHREC_RIGHT (c_2)) != INTEGER_CST) | |
3279 | { | |
3280 | DDR_AFFINE_P (ddr) = false; | |
ba42e045 SP |
3281 | return; |
3282 | } | |
304afda6 | 3283 | |
ba42e045 SP |
3284 | x_2 = index_in_loop_nest (CHREC_VARIABLE (c_2), DDR_LOOP_NEST (ddr)); |
3285 | x_1 = index_in_loop_nest (CHREC_VARIABLE (c_1), DDR_LOOP_NEST (ddr)); | |
304afda6 | 3286 | |
ba42e045 SP |
3287 | /* For "{{0, +, 2}_1, +, 3}_2" the distance vector is (3, -2). */ |
3288 | dist_v = lambda_vector_new (DDR_NB_LOOPS (ddr)); | |
6b6fa4e9 SP |
3289 | v1 = int_cst_value (CHREC_RIGHT (c_1)); |
3290 | v2 = int_cst_value (CHREC_RIGHT (c_2)); | |
0ca2faee ZD |
3291 | cd = gcd (v1, v2); |
3292 | v1 /= cd; | |
3293 | v2 /= cd; | |
3294 | ||
3295 | if (v2 < 0) | |
3296 | { | |
3297 | v2 = -v2; | |
3298 | v1 = -v1; | |
3299 | } | |
3300 | ||
3301 | dist_v[x_1] = v2; | |
3302 | dist_v[x_2] = -v1; | |
ba42e045 | 3303 | save_dist_v (ddr, dist_v); |
304afda6 | 3304 | |
ba42e045 SP |
3305 | add_outer_distances (ddr, dist_v, x_1); |
3306 | } | |
304afda6 | 3307 | |
ba42e045 SP |
3308 | /* Helper function for the case where DDR_A and DDR_B are the same |
3309 | access functions. */ | |
37b8a73b | 3310 | |
ba42e045 SP |
3311 | static void |
3312 | add_other_self_distances (struct data_dependence_relation *ddr) | |
3313 | { | |
3314 | lambda_vector dist_v; | |
3315 | unsigned i; | |
3316 | int index_carry = DDR_NB_LOOPS (ddr); | |
304afda6 | 3317 | |
ba42e045 | 3318 | for (i = 0; i < DDR_NUM_SUBSCRIPTS (ddr); i++) |
37b8a73b | 3319 | { |
ba42e045 | 3320 | tree access_fun = DR_ACCESS_FN (DDR_A (ddr), i); |
304afda6 | 3321 | |
ba42e045 | 3322 | if (TREE_CODE (access_fun) == POLYNOMIAL_CHREC) |
304afda6 | 3323 | { |
ba42e045 SP |
3324 | if (!evolution_function_is_univariate_p (access_fun)) |
3325 | { | |
3326 | if (DDR_NUM_SUBSCRIPTS (ddr) != 1) | |
3327 | { | |
3328 | DDR_ARE_DEPENDENT (ddr) = chrec_dont_know; | |
3329 | return; | |
3330 | } | |
3331 | ||
097392de SP |
3332 | access_fun = DR_ACCESS_FN (DDR_A (ddr), 0); |
3333 | ||
3334 | if (TREE_CODE (CHREC_LEFT (access_fun)) == POLYNOMIAL_CHREC) | |
3335 | add_multivariate_self_dist (ddr, access_fun); | |
3336 | else | |
3337 | /* The evolution step is not constant: it varies in | |
3338 | the outer loop, so this cannot be represented by a | |
3339 | distance vector. For example in pr34635.c the | |
3340 | evolution is {0, +, {0, +, 4}_1}_2. */ | |
3341 | DDR_AFFINE_P (ddr) = false; | |
3342 | ||
ba42e045 SP |
3343 | return; |
3344 | } | |
3345 | ||
3346 | index_carry = MIN (index_carry, | |
3347 | index_in_loop_nest (CHREC_VARIABLE (access_fun), | |
3348 | DDR_LOOP_NEST (ddr))); | |
304afda6 | 3349 | } |
37b8a73b SP |
3350 | } |
3351 | ||
ba42e045 SP |
3352 | dist_v = lambda_vector_new (DDR_NB_LOOPS (ddr)); |
3353 | add_outer_distances (ddr, dist_v, index_carry); | |
56cf8686 SP |
3354 | } |
3355 | ||
1baf2906 SP |
3356 | static void |
3357 | insert_innermost_unit_dist_vector (struct data_dependence_relation *ddr) | |
3358 | { | |
3359 | lambda_vector dist_v = lambda_vector_new (DDR_NB_LOOPS (ddr)); | |
3360 | ||
3361 | dist_v[DDR_INNER_LOOP (ddr)] = 1; | |
3362 | save_dist_v (ddr, dist_v); | |
3363 | } | |
3364 | ||
3365 | /* Adds a unit distance vector to DDR when there is a 0 overlap. This | |
3366 | is the case for example when access functions are the same and | |
3367 | equal to a constant, as in: | |
3368 | ||
3369 | | loop_1 | |
3370 | | A[3] = ... | |
3371 | | ... = A[3] | |
3372 | | endloop_1 | |
3373 | ||
3374 | in which case the distance vectors are (0) and (1). */ | |
3375 | ||
3376 | static void | |
3377 | add_distance_for_zero_overlaps (struct data_dependence_relation *ddr) | |
3378 | { | |
3379 | unsigned i, j; | |
3380 | ||
3381 | for (i = 0; i < DDR_NUM_SUBSCRIPTS (ddr); i++) | |
3382 | { | |
3383 | subscript_p sub = DDR_SUBSCRIPT (ddr, i); | |
3384 | conflict_function *ca = SUB_CONFLICTS_IN_A (sub); | |
3385 | conflict_function *cb = SUB_CONFLICTS_IN_B (sub); | |
3386 | ||
3387 | for (j = 0; j < ca->n; j++) | |
3388 | if (affine_function_zero_p (ca->fns[j])) | |
3389 | { | |
3390 | insert_innermost_unit_dist_vector (ddr); | |
3391 | return; | |
3392 | } | |
3393 | ||
3394 | for (j = 0; j < cb->n; j++) | |
3395 | if (affine_function_zero_p (cb->fns[j])) | |
3396 | { | |
3397 | insert_innermost_unit_dist_vector (ddr); | |
3398 | return; | |
3399 | } | |
3400 | } | |
3401 | } | |
3402 | ||
ba42e045 SP |
3403 | /* Compute the classic per loop distance vector. DDR is the data |
3404 | dependence relation to build a vector from. Return false when fail | |
3405 | to represent the data dependence as a distance vector. */ | |
56cf8686 | 3406 | |
464f49d8 | 3407 | static bool |
da9a21f4 SP |
3408 | build_classic_dist_vector (struct data_dependence_relation *ddr, |
3409 | struct loop *loop_nest) | |
56cf8686 | 3410 | { |
304afda6 | 3411 | bool init_b = false; |
ba42e045 SP |
3412 | int index_carry = DDR_NB_LOOPS (ddr); |
3413 | lambda_vector dist_v; | |
304afda6 | 3414 | |
36d59cf7 | 3415 | if (DDR_ARE_DEPENDENT (ddr) != NULL_TREE) |
2f470326 | 3416 | return false; |
ba42e045 SP |
3417 | |
3418 | if (same_access_functions (ddr)) | |
56cf8686 | 3419 | { |
ba42e045 SP |
3420 | /* Save the 0 vector. */ |
3421 | dist_v = lambda_vector_new (DDR_NB_LOOPS (ddr)); | |
3422 | save_dist_v (ddr, dist_v); | |
56cf8686 | 3423 | |
1baf2906 SP |
3424 | if (constant_access_functions (ddr)) |
3425 | add_distance_for_zero_overlaps (ddr); | |
3426 | ||
ba42e045 SP |
3427 | if (DDR_NB_LOOPS (ddr) > 1) |
3428 | add_other_self_distances (ddr); | |
86df10e3 | 3429 | |
ba42e045 SP |
3430 | return true; |
3431 | } | |
86df10e3 | 3432 | |
ba42e045 SP |
3433 | dist_v = lambda_vector_new (DDR_NB_LOOPS (ddr)); |
3434 | if (!build_classic_dist_vector_1 (ddr, DDR_A (ddr), DDR_B (ddr), | |
3435 | dist_v, &init_b, &index_carry)) | |
3436 | return false; | |
86df10e3 | 3437 | |
ba42e045 SP |
3438 | /* Save the distance vector if we initialized one. */ |
3439 | if (init_b) | |
3440 | { | |
3441 | /* Verify a basic constraint: classic distance vectors should | |
3442 | always be lexicographically positive. | |
3443 | ||
3444 | Data references are collected in the order of execution of | |
3445 | the program, thus for the following loop | |
3446 | ||
3447 | | for (i = 1; i < 100; i++) | |
3448 | | for (j = 1; j < 100; j++) | |
3449 | | { | |
3450 | | t = T[j+1][i-1]; // A | |
3451 | | T[j][i] = t + 2; // B | |
3452 | | } | |
3453 | ||
3454 | references are collected following the direction of the wind: | |
3455 | A then B. The data dependence tests are performed also | |
3456 | following this order, such that we're looking at the distance | |
3457 | separating the elements accessed by A from the elements later | |
3458 | accessed by B. But in this example, the distance returned by | |
3459 | test_dep (A, B) is lexicographically negative (-1, 1), that | |
3460 | means that the access A occurs later than B with respect to | |
3461 | the outer loop, ie. we're actually looking upwind. In this | |
3462 | case we solve test_dep (B, A) looking downwind to the | |
3463 | lexicographically positive solution, that returns the | |
3464 | distance vector (1, -1). */ | |
3465 | if (!lambda_vector_lexico_pos (dist_v, DDR_NB_LOOPS (ddr))) | |
3466 | { | |
3467 | lambda_vector save_v = lambda_vector_new (DDR_NB_LOOPS (ddr)); | |
2f470326 JJ |
3468 | if (!subscript_dependence_tester_1 (ddr, DDR_B (ddr), DDR_A (ddr), |
3469 | loop_nest)) | |
3470 | return false; | |
ba42e045 | 3471 | compute_subscript_distance (ddr); |
2f470326 JJ |
3472 | if (!build_classic_dist_vector_1 (ddr, DDR_B (ddr), DDR_A (ddr), |
3473 | save_v, &init_b, &index_carry)) | |
3474 | return false; | |
ba42e045 | 3475 | save_dist_v (ddr, save_v); |
71d5b5e1 | 3476 | DDR_REVERSED_P (ddr) = true; |
ba42e045 SP |
3477 | |
3478 | /* In this case there is a dependence forward for all the | |
3479 | outer loops: | |
3480 | ||
3481 | | for (k = 1; k < 100; k++) | |
3482 | | for (i = 1; i < 100; i++) | |
3483 | | for (j = 1; j < 100; j++) | |
3484 | | { | |
3485 | | t = T[j+1][i-1]; // A | |
3486 | | T[j][i] = t + 2; // B | |
3487 | | } | |
3488 | ||
b8698a0f | 3489 | the vectors are: |
ba42e045 SP |
3490 | (0, 1, -1) |
3491 | (1, 1, -1) | |
3492 | (1, -1, 1) | |
3493 | */ | |
3494 | if (DDR_NB_LOOPS (ddr) > 1) | |
3495 | { | |
3496 | add_outer_distances (ddr, save_v, index_carry); | |
3497 | add_outer_distances (ddr, dist_v, index_carry); | |
86df10e3 | 3498 | } |
ba42e045 SP |
3499 | } |
3500 | else | |
3501 | { | |
3502 | lambda_vector save_v = lambda_vector_new (DDR_NB_LOOPS (ddr)); | |
3503 | lambda_vector_copy (dist_v, save_v, DDR_NB_LOOPS (ddr)); | |
86df10e3 | 3504 | |
ba42e045 | 3505 | if (DDR_NB_LOOPS (ddr) > 1) |
56cf8686 | 3506 | { |
ba42e045 | 3507 | lambda_vector opposite_v = lambda_vector_new (DDR_NB_LOOPS (ddr)); |
86df10e3 | 3508 | |
2f470326 JJ |
3509 | if (!subscript_dependence_tester_1 (ddr, DDR_B (ddr), |
3510 | DDR_A (ddr), loop_nest)) | |
3511 | return false; | |
ba42e045 | 3512 | compute_subscript_distance (ddr); |
2f470326 JJ |
3513 | if (!build_classic_dist_vector_1 (ddr, DDR_B (ddr), DDR_A (ddr), |
3514 | opposite_v, &init_b, | |
3515 | &index_carry)) | |
3516 | return false; | |
86df10e3 | 3517 | |
2f470326 | 3518 | save_dist_v (ddr, save_v); |
ba42e045 SP |
3519 | add_outer_distances (ddr, dist_v, index_carry); |
3520 | add_outer_distances (ddr, opposite_v, index_carry); | |
56cf8686 | 3521 | } |
2f470326 JJ |
3522 | else |
3523 | save_dist_v (ddr, save_v); | |
56cf8686 SP |
3524 | } |
3525 | } | |
ba42e045 SP |
3526 | else |
3527 | { | |
3528 | /* There is a distance of 1 on all the outer loops: Example: | |
3529 | there is a dependence of distance 1 on loop_1 for the array A. | |
304afda6 | 3530 | |
ba42e045 SP |
3531 | | loop_1 |
3532 | | A[5] = ... | |
3533 | | endloop | |
3534 | */ | |
3535 | add_outer_distances (ddr, dist_v, | |
3536 | lambda_vector_first_nz (dist_v, | |
3537 | DDR_NB_LOOPS (ddr), 0)); | |
3538 | } | |
3539 | ||
3540 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
304afda6 | 3541 | { |
ba42e045 | 3542 | unsigned i; |
304afda6 | 3543 | |
ba42e045 SP |
3544 | fprintf (dump_file, "(build_classic_dist_vector\n"); |
3545 | for (i = 0; i < DDR_NUM_DIST_VECTS (ddr); i++) | |
3546 | { | |
3547 | fprintf (dump_file, " dist_vector = ("); | |
3548 | print_lambda_vector (dump_file, DDR_DIST_VECT (ddr, i), | |
3549 | DDR_NB_LOOPS (ddr)); | |
3550 | fprintf (dump_file, " )\n"); | |
3551 | } | |
3552 | fprintf (dump_file, ")\n"); | |
304afda6 SP |
3553 | } |
3554 | ||
ba42e045 SP |
3555 | return true; |
3556 | } | |
56cf8686 | 3557 | |
ba42e045 SP |
3558 | /* Return the direction for a given distance. |
3559 | FIXME: Computing dir this way is suboptimal, since dir can catch | |
3560 | cases that dist is unable to represent. */ | |
86df10e3 | 3561 | |
ba42e045 SP |
3562 | static inline enum data_dependence_direction |
3563 | dir_from_dist (int dist) | |
3564 | { | |
3565 | if (dist > 0) | |
3566 | return dir_positive; | |
3567 | else if (dist < 0) | |
3568 | return dir_negative; | |
3569 | else | |
3570 | return dir_equal; | |
3571 | } | |
304afda6 | 3572 | |
ba42e045 SP |
3573 | /* Compute the classic per loop direction vector. DDR is the data |
3574 | dependence relation to build a vector from. */ | |
304afda6 | 3575 | |
ba42e045 SP |
3576 | static void |
3577 | build_classic_dir_vector (struct data_dependence_relation *ddr) | |
3578 | { | |
3579 | unsigned i, j; | |
3580 | lambda_vector dist_v; | |
86df10e3 | 3581 | |
9771b263 | 3582 | FOR_EACH_VEC_ELT (DDR_DIST_VECTS (ddr), i, dist_v) |
ba42e045 SP |
3583 | { |
3584 | lambda_vector dir_v = lambda_vector_new (DDR_NB_LOOPS (ddr)); | |
86df10e3 | 3585 | |
ba42e045 SP |
3586 | for (j = 0; j < DDR_NB_LOOPS (ddr); j++) |
3587 | dir_v[j] = dir_from_dist (dist_v[j]); | |
304afda6 | 3588 | |
ba42e045 SP |
3589 | save_dir_v (ddr, dir_v); |
3590 | } | |
56cf8686 SP |
3591 | } |
3592 | ||
ba42e045 SP |
3593 | /* Helper function. Returns true when there is a dependence between |
3594 | data references DRA and DRB. */ | |
0ff4040e | 3595 | |
ba42e045 SP |
3596 | static bool |
3597 | subscript_dependence_tester_1 (struct data_dependence_relation *ddr, | |
3598 | struct data_reference *dra, | |
da9a21f4 SP |
3599 | struct data_reference *drb, |
3600 | struct loop *loop_nest) | |
0ff4040e SP |
3601 | { |
3602 | unsigned int i; | |
0ff4040e | 3603 | tree last_conflicts; |
ebf78a47 | 3604 | struct subscript *subscript; |
9b00587c | 3605 | tree res = NULL_TREE; |
ba42e045 | 3606 | |
9771b263 | 3607 | for (i = 0; DDR_SUBSCRIPTS (ddr).iterate (i, &subscript); i++) |
0ff4040e | 3608 | { |
d93817c4 | 3609 | conflict_function *overlaps_a, *overlaps_b; |
ebf78a47 | 3610 | |
b8698a0f | 3611 | analyze_overlapping_iterations (DR_ACCESS_FN (dra, i), |
0ff4040e | 3612 | DR_ACCESS_FN (drb, i), |
b8698a0f | 3613 | &overlaps_a, &overlaps_b, |
da9a21f4 | 3614 | &last_conflicts, loop_nest); |
ebf78a47 | 3615 | |
9b00587c RG |
3616 | if (SUB_CONFLICTS_IN_A (subscript)) |
3617 | free_conflict_function (SUB_CONFLICTS_IN_A (subscript)); | |
3618 | if (SUB_CONFLICTS_IN_B (subscript)) | |
3619 | free_conflict_function (SUB_CONFLICTS_IN_B (subscript)); | |
3620 | ||
3621 | SUB_CONFLICTS_IN_A (subscript) = overlaps_a; | |
3622 | SUB_CONFLICTS_IN_B (subscript) = overlaps_b; | |
3623 | SUB_LAST_CONFLICT (subscript) = last_conflicts; | |
3624 | ||
3625 | /* If there is any undetermined conflict function we have to | |
3626 | give a conservative answer in case we cannot prove that | |
3627 | no dependence exists when analyzing another subscript. */ | |
d93817c4 ZD |
3628 | if (CF_NOT_KNOWN_P (overlaps_a) |
3629 | || CF_NOT_KNOWN_P (overlaps_b)) | |
0ff4040e | 3630 | { |
9b00587c RG |
3631 | res = chrec_dont_know; |
3632 | continue; | |
0ff4040e | 3633 | } |
ebf78a47 | 3634 | |
9b00587c | 3635 | /* When there is a subscript with no dependence we can stop. */ |
d93817c4 ZD |
3636 | else if (CF_NO_DEPENDENCE_P (overlaps_a) |
3637 | || CF_NO_DEPENDENCE_P (overlaps_b)) | |
0ff4040e | 3638 | { |
9b00587c RG |
3639 | res = chrec_known; |
3640 | break; | |
0ff4040e SP |
3641 | } |
3642 | } | |
3643 | ||
9b00587c RG |
3644 | if (res == NULL_TREE) |
3645 | return true; | |
3646 | ||
3647 | if (res == chrec_known) | |
3648 | dependence_stats.num_dependence_independent++; | |
3649 | else | |
3650 | dependence_stats.num_dependence_undetermined++; | |
3651 | finalize_ddr_dependent (ddr, res); | |
3652 | return false; | |
ba42e045 SP |
3653 | } |
3654 | ||
da9a21f4 | 3655 | /* Computes the conflicting iterations in LOOP_NEST, and initialize DDR. */ |
ba42e045 SP |
3656 | |
3657 | static void | |
da9a21f4 SP |
3658 | subscript_dependence_tester (struct data_dependence_relation *ddr, |
3659 | struct loop *loop_nest) | |
ba42e045 | 3660 | { |
da9a21f4 | 3661 | if (subscript_dependence_tester_1 (ddr, DDR_A (ddr), DDR_B (ddr), loop_nest)) |
ba42e045 | 3662 | dependence_stats.num_dependence_dependent++; |
0ff4040e | 3663 | |
0ff4040e | 3664 | compute_subscript_distance (ddr); |
da9a21f4 | 3665 | if (build_classic_dist_vector (ddr, loop_nest)) |
ba42e045 | 3666 | build_classic_dir_vector (ddr); |
0ff4040e SP |
3667 | } |
3668 | ||
56cf8686 | 3669 | /* Returns true when all the access functions of A are affine or |
da9a21f4 | 3670 | constant with respect to LOOP_NEST. */ |
56cf8686 | 3671 | |
b8698a0f | 3672 | static bool |
ed7a4b4b KG |
3673 | access_functions_are_affine_or_constant_p (const struct data_reference *a, |
3674 | const struct loop *loop_nest) | |
56cf8686 SP |
3675 | { |
3676 | unsigned int i; | |
9771b263 | 3677 | vec<tree> fns = DR_ACCESS_FNS (a); |
9cbb7989 | 3678 | tree t; |
3d8864c0 | 3679 | |
9771b263 | 3680 | FOR_EACH_VEC_ELT (fns, i, t) |
da9a21f4 SP |
3681 | if (!evolution_function_is_invariant_p (t, loop_nest->num) |
3682 | && !evolution_function_is_affine_multivariate_p (t, loop_nest->num)) | |
56cf8686 | 3683 | return false; |
b8698a0f | 3684 | |
56cf8686 SP |
3685 | return true; |
3686 | } | |
3687 | ||
da9a21f4 SP |
3688 | /* This computes the affine dependence relation between A and B with |
3689 | respect to LOOP_NEST. CHREC_KNOWN is used for representing the | |
3690 | independence between two accesses, while CHREC_DONT_KNOW is used | |
3691 | for representing the unknown relation. | |
b8698a0f | 3692 | |
56cf8686 SP |
3693 | Note that it is possible to stop the computation of the dependence |
3694 | relation the first time we detect a CHREC_KNOWN element for a given | |
3695 | subscript. */ | |
3696 | ||
f20132e7 | 3697 | void |
da9a21f4 SP |
3698 | compute_affine_dependence (struct data_dependence_relation *ddr, |
3699 | struct loop *loop_nest) | |
56cf8686 SP |
3700 | { |
3701 | struct data_reference *dra = DDR_A (ddr); | |
3702 | struct data_reference *drb = DDR_B (ddr); | |
b8698a0f | 3703 | |
56cf8686 SP |
3704 | if (dump_file && (dump_flags & TDF_DETAILS)) |
3705 | { | |
36d59cf7 | 3706 | fprintf (dump_file, "(compute_affine_dependence\n"); |
c4ddde1b RG |
3707 | fprintf (dump_file, " stmt_a: "); |
3708 | print_gimple_stmt (dump_file, DR_STMT (dra), 0, TDF_SLIM); | |
3709 | fprintf (dump_file, " stmt_b: "); | |
3710 | print_gimple_stmt (dump_file, DR_STMT (drb), 0, TDF_SLIM); | |
56cf8686 | 3711 | } |
0ff4040e | 3712 | |
56cf8686 | 3713 | /* Analyze only when the dependence relation is not yet known. */ |
1a4571cb | 3714 | if (DDR_ARE_DEPENDENT (ddr) == NULL_TREE) |
56cf8686 | 3715 | { |
0ff4040e SP |
3716 | dependence_stats.num_dependence_tests++; |
3717 | ||
da9a21f4 SP |
3718 | if (access_functions_are_affine_or_constant_p (dra, loop_nest) |
3719 | && access_functions_are_affine_or_constant_p (drb, loop_nest)) | |
49b8fe6c | 3720 | subscript_dependence_tester (ddr, loop_nest); |
b8698a0f | 3721 | |
56cf8686 SP |
3722 | /* As a last case, if the dependence cannot be determined, or if |
3723 | the dependence is considered too difficult to determine, answer | |
3724 | "don't know". */ | |
3725 | else | |
0ff4040e SP |
3726 | { |
3727 | dependence_stats.num_dependence_undetermined++; | |
3728 | ||
3729 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
3730 | { | |
3731 | fprintf (dump_file, "Data ref a:\n"); | |
3732 | dump_data_reference (dump_file, dra); | |
3733 | fprintf (dump_file, "Data ref b:\n"); | |
3734 | dump_data_reference (dump_file, drb); | |
3735 | fprintf (dump_file, "affine dependence test not usable: access function not affine or constant.\n"); | |
3736 | } | |
3737 | finalize_ddr_dependent (ddr, chrec_dont_know); | |
3738 | } | |
56cf8686 | 3739 | } |
b8698a0f | 3740 | |
56cf8686 | 3741 | if (dump_file && (dump_flags & TDF_DETAILS)) |
c4ddde1b RG |
3742 | { |
3743 | if (DDR_ARE_DEPENDENT (ddr) == chrec_known) | |
3744 | fprintf (dump_file, ") -> no dependence\n"); | |
3745 | else if (DDR_ARE_DEPENDENT (ddr) == chrec_dont_know) | |
3746 | fprintf (dump_file, ") -> dependence analysis failed\n"); | |
3747 | else | |
3748 | fprintf (dump_file, ")\n"); | |
3749 | } | |
56cf8686 SP |
3750 | } |
3751 | ||
ba42e045 SP |
3752 | /* Compute in DEPENDENCE_RELATIONS the data dependence graph for all |
3753 | the data references in DATAREFS, in the LOOP_NEST. When | |
ebf78a47 | 3754 | COMPUTE_SELF_AND_RR is FALSE, don't compute read-read and self |
3881dee9 AB |
3755 | relations. Return true when successful, i.e. data references number |
3756 | is small enough to be handled. */ | |
56cf8686 | 3757 | |
3881dee9 | 3758 | bool |
9771b263 DN |
3759 | compute_all_dependences (vec<data_reference_p> datarefs, |
3760 | vec<ddr_p> *dependence_relations, | |
3761 | vec<loop_p> loop_nest, | |
ebf78a47 | 3762 | bool compute_self_and_rr) |
56cf8686 | 3763 | { |
ebf78a47 SP |
3764 | struct data_dependence_relation *ddr; |
3765 | struct data_reference *a, *b; | |
3766 | unsigned int i, j; | |
56cf8686 | 3767 | |
9771b263 | 3768 | if ((int) datarefs.length () |
3881dee9 AB |
3769 | > PARAM_VALUE (PARAM_LOOP_MAX_DATAREFS_FOR_DATADEPS)) |
3770 | { | |
3771 | struct data_dependence_relation *ddr; | |
3772 | ||
3773 | /* Insert a single relation into dependence_relations: | |
3774 | chrec_dont_know. */ | |
3775 | ddr = initialize_data_dependence_relation (NULL, NULL, loop_nest); | |
9771b263 | 3776 | dependence_relations->safe_push (ddr); |
3881dee9 AB |
3777 | return false; |
3778 | } | |
3779 | ||
9771b263 DN |
3780 | FOR_EACH_VEC_ELT (datarefs, i, a) |
3781 | for (j = i + 1; datarefs.iterate (j, &b); j++) | |
b0af49c4 | 3782 | if (DR_IS_WRITE (a) || DR_IS_WRITE (b) || compute_self_and_rr) |
ebf78a47 SP |
3783 | { |
3784 | ddr = initialize_data_dependence_relation (a, b, loop_nest); | |
9771b263 DN |
3785 | dependence_relations->safe_push (ddr); |
3786 | if (loop_nest.exists ()) | |
3787 | compute_affine_dependence (ddr, loop_nest[0]); | |
ebf78a47 | 3788 | } |
789246d7 | 3789 | |
ebf78a47 | 3790 | if (compute_self_and_rr) |
9771b263 | 3791 | FOR_EACH_VEC_ELT (datarefs, i, a) |
56cf8686 | 3792 | { |
ebf78a47 | 3793 | ddr = initialize_data_dependence_relation (a, a, loop_nest); |
9771b263 DN |
3794 | dependence_relations->safe_push (ddr); |
3795 | if (loop_nest.exists ()) | |
3796 | compute_affine_dependence (ddr, loop_nest[0]); | |
56cf8686 | 3797 | } |
3881dee9 AB |
3798 | |
3799 | return true; | |
56cf8686 SP |
3800 | } |
3801 | ||
aeb83f09 RG |
3802 | /* Describes a location of a memory reference. */ |
3803 | ||
50686850 | 3804 | struct data_ref_loc |
aeb83f09 | 3805 | { |
a3698dfc JJ |
3806 | /* The memory reference. */ |
3807 | tree ref; | |
aeb83f09 | 3808 | |
fcac74a1 RB |
3809 | /* True if the memory reference is read. */ |
3810 | bool is_read; | |
50686850 | 3811 | }; |
aeb83f09 | 3812 | |
aeb83f09 | 3813 | |
946e1bc7 ZD |
3814 | /* Stores the locations of memory references in STMT to REFERENCES. Returns |
3815 | true if STMT clobbers memory, false otherwise. */ | |
3816 | ||
aeb83f09 | 3817 | static bool |
355fe088 | 3818 | get_references_in_stmt (gimple *stmt, vec<data_ref_loc, va_heap> *references) |
946e1bc7 ZD |
3819 | { |
3820 | bool clobbers_memory = false; | |
f32682ca | 3821 | data_ref_loc ref; |
a3698dfc | 3822 | tree op0, op1; |
726a989a | 3823 | enum gimple_code stmt_code = gimple_code (stmt); |
946e1bc7 | 3824 | |
946e1bc7 | 3825 | /* ASM_EXPR and CALL_EXPR may embed arbitrary side effects. |
f2ea3c15 RG |
3826 | As we cannot model data-references to not spelled out |
3827 | accesses give up if they may occur. */ | |
74bf76ed JJ |
3828 | if (stmt_code == GIMPLE_CALL |
3829 | && !(gimple_call_flags (stmt) & ECF_CONST)) | |
3830 | { | |
3831 | /* Allow IFN_GOMP_SIMD_LANE in their own loops. */ | |
5ce9450f JJ |
3832 | if (gimple_call_internal_p (stmt)) |
3833 | switch (gimple_call_internal_fn (stmt)) | |
3834 | { | |
3835 | case IFN_GOMP_SIMD_LANE: | |
3836 | { | |
3837 | struct loop *loop = gimple_bb (stmt)->loop_father; | |
3838 | tree uid = gimple_call_arg (stmt, 0); | |
3839 | gcc_assert (TREE_CODE (uid) == SSA_NAME); | |
3840 | if (loop == NULL | |
3841 | || loop->simduid != SSA_NAME_VAR (uid)) | |
3842 | clobbers_memory = true; | |
3843 | break; | |
3844 | } | |
3845 | case IFN_MASK_LOAD: | |
3846 | case IFN_MASK_STORE: | |
3847 | break; | |
3848 | default: | |
74bf76ed | 3849 | clobbers_memory = true; |
5ce9450f JJ |
3850 | break; |
3851 | } | |
74bf76ed JJ |
3852 | else |
3853 | clobbers_memory = true; | |
3854 | } | |
3855 | else if (stmt_code == GIMPLE_ASM | |
538dd0b7 DM |
3856 | && (gimple_asm_volatile_p (as_a <gasm *> (stmt)) |
3857 | || gimple_vuse (stmt))) | |
946e1bc7 ZD |
3858 | clobbers_memory = true; |
3859 | ||
5006671f | 3860 | if (!gimple_vuse (stmt)) |
946e1bc7 ZD |
3861 | return clobbers_memory; |
3862 | ||
726a989a | 3863 | if (stmt_code == GIMPLE_ASSIGN) |
946e1bc7 | 3864 | { |
c8ae0bec | 3865 | tree base; |
a3698dfc JJ |
3866 | op0 = gimple_assign_lhs (stmt); |
3867 | op1 = gimple_assign_rhs1 (stmt); | |
b8698a0f | 3868 | |
a3698dfc JJ |
3869 | if (DECL_P (op1) |
3870 | || (REFERENCE_CLASS_P (op1) | |
3871 | && (base = get_base_address (op1)) | |
a241f8ca JJ |
3872 | && TREE_CODE (base) != SSA_NAME |
3873 | && !is_gimple_min_invariant (base))) | |
946e1bc7 | 3874 | { |
a3698dfc | 3875 | ref.ref = op1; |
f32682ca | 3876 | ref.is_read = true; |
9771b263 | 3877 | references->safe_push (ref); |
946e1bc7 | 3878 | } |
946e1bc7 | 3879 | } |
726a989a | 3880 | else if (stmt_code == GIMPLE_CALL) |
946e1bc7 | 3881 | { |
1b14d815 | 3882 | unsigned i, n; |
08554c26 JJ |
3883 | tree ptr, type; |
3884 | unsigned int align; | |
ac84e05e | 3885 | |
5ce9450f JJ |
3886 | ref.is_read = false; |
3887 | if (gimple_call_internal_p (stmt)) | |
3888 | switch (gimple_call_internal_fn (stmt)) | |
3889 | { | |
3890 | case IFN_MASK_LOAD: | |
8e91d222 JJ |
3891 | if (gimple_call_lhs (stmt) == NULL_TREE) |
3892 | break; | |
5ce9450f | 3893 | ref.is_read = true; |
191816a3 | 3894 | /* FALLTHRU */ |
5ce9450f | 3895 | case IFN_MASK_STORE: |
08554c26 JJ |
3896 | ptr = build_int_cst (TREE_TYPE (gimple_call_arg (stmt, 1)), 0); |
3897 | align = tree_to_shwi (gimple_call_arg (stmt, 1)); | |
3898 | if (ref.is_read) | |
3899 | type = TREE_TYPE (gimple_call_lhs (stmt)); | |
3900 | else | |
3901 | type = TREE_TYPE (gimple_call_arg (stmt, 3)); | |
3902 | if (TYPE_ALIGN (type) != align) | |
3903 | type = build_aligned_type (type, align); | |
3904 | ref.ref = fold_build2 (MEM_REF, type, gimple_call_arg (stmt, 0), | |
3905 | ptr); | |
5ce9450f JJ |
3906 | references->safe_push (ref); |
3907 | return false; | |
3908 | default: | |
3909 | break; | |
3910 | } | |
3911 | ||
a3698dfc | 3912 | op0 = gimple_call_lhs (stmt); |
1b14d815 | 3913 | n = gimple_call_num_args (stmt); |
ac84e05e | 3914 | for (i = 0; i < n; i++) |
946e1bc7 | 3915 | { |
a3698dfc | 3916 | op1 = gimple_call_arg (stmt, i); |
ac84e05e | 3917 | |
a3698dfc JJ |
3918 | if (DECL_P (op1) |
3919 | || (REFERENCE_CLASS_P (op1) && get_base_address (op1))) | |
946e1bc7 | 3920 | { |
a3698dfc | 3921 | ref.ref = op1; |
f32682ca | 3922 | ref.is_read = true; |
9771b263 | 3923 | references->safe_push (ref); |
946e1bc7 ZD |
3924 | } |
3925 | } | |
3926 | } | |
1b14d815 RS |
3927 | else |
3928 | return clobbers_memory; | |
946e1bc7 | 3929 | |
a3698dfc JJ |
3930 | if (op0 |
3931 | && (DECL_P (op0) | |
3932 | || (REFERENCE_CLASS_P (op0) && get_base_address (op0)))) | |
1b14d815 | 3933 | { |
a3698dfc | 3934 | ref.ref = op0; |
f32682ca | 3935 | ref.is_read = false; |
9771b263 | 3936 | references->safe_push (ref); |
1b14d815 | 3937 | } |
946e1bc7 ZD |
3938 | return clobbers_memory; |
3939 | } | |
3940 | ||
74032f47 AK |
3941 | |
3942 | /* Returns true if the loop-nest has any data reference. */ | |
3943 | ||
3944 | bool | |
3945 | loop_nest_has_data_refs (loop_p loop) | |
3946 | { | |
3947 | basic_block *bbs = get_loop_body (loop); | |
8c681247 | 3948 | auto_vec<data_ref_loc, 3> references; |
74032f47 AK |
3949 | |
3950 | for (unsigned i = 0; i < loop->num_nodes; i++) | |
3951 | { | |
3952 | basic_block bb = bbs[i]; | |
3953 | gimple_stmt_iterator bsi; | |
3954 | ||
3955 | for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
3956 | { | |
355fe088 | 3957 | gimple *stmt = gsi_stmt (bsi); |
74032f47 AK |
3958 | get_references_in_stmt (stmt, &references); |
3959 | if (references.length ()) | |
3960 | { | |
3961 | free (bbs); | |
74032f47 AK |
3962 | return true; |
3963 | } | |
3964 | } | |
3965 | } | |
3966 | free (bbs); | |
74032f47 AK |
3967 | |
3968 | if (loop->inner) | |
3969 | { | |
3970 | loop = loop->inner; | |
3971 | while (loop) | |
3972 | { | |
3973 | if (loop_nest_has_data_refs (loop)) | |
3974 | return true; | |
3975 | loop = loop->next; | |
3976 | } | |
3977 | } | |
3978 | return false; | |
3979 | } | |
3980 | ||
946e1bc7 | 3981 | /* Stores the data references in STMT to DATAREFS. If there is an unanalyzable |
3cb960c7 | 3982 | reference, returns false, otherwise returns true. NEST is the outermost |
f8bf9252 | 3983 | loop of the loop nest in which the references should be analyzed. */ |
946e1bc7 | 3984 | |
f8bf9252 | 3985 | bool |
355fe088 | 3986 | find_data_references_in_stmt (struct loop *nest, gimple *stmt, |
9771b263 | 3987 | vec<data_reference_p> *datarefs) |
946e1bc7 ZD |
3988 | { |
3989 | unsigned i; | |
00f96dc9 | 3990 | auto_vec<data_ref_loc, 2> references; |
946e1bc7 ZD |
3991 | data_ref_loc *ref; |
3992 | bool ret = true; | |
3993 | data_reference_p dr; | |
3994 | ||
3995 | if (get_references_in_stmt (stmt, &references)) | |
ff4c81cc | 3996 | return false; |
946e1bc7 | 3997 | |
9771b263 | 3998 | FOR_EACH_VEC_ELT (references, i, ref) |
946e1bc7 | 3999 | { |
5c640e29 | 4000 | dr = create_data_ref (nest, loop_containing_stmt (stmt), |
a3698dfc | 4001 | ref->ref, stmt, ref->is_read); |
bbc8a8dc | 4002 | gcc_assert (dr != NULL); |
9771b263 | 4003 | datarefs->safe_push (dr); |
946e1bc7 | 4004 | } |
4a0e3b5a | 4005 | |
946e1bc7 ZD |
4006 | return ret; |
4007 | } | |
4008 | ||
5c640e29 SP |
4009 | /* Stores the data references in STMT to DATAREFS. If there is an |
4010 | unanalyzable reference, returns false, otherwise returns true. | |
4011 | NEST is the outermost loop of the loop nest in which the references | |
4012 | should be instantiated, LOOP is the loop in which the references | |
4013 | should be analyzed. */ | |
ed91d661 SP |
4014 | |
4015 | bool | |
355fe088 | 4016 | graphite_find_data_references_in_stmt (loop_p nest, loop_p loop, gimple *stmt, |
9771b263 | 4017 | vec<data_reference_p> *datarefs) |
ed91d661 SP |
4018 | { |
4019 | unsigned i; | |
00f96dc9 | 4020 | auto_vec<data_ref_loc, 2> references; |
ed91d661 SP |
4021 | data_ref_loc *ref; |
4022 | bool ret = true; | |
4023 | data_reference_p dr; | |
4024 | ||
4025 | if (get_references_in_stmt (stmt, &references)) | |
ff4c81cc | 4026 | return false; |
ed91d661 | 4027 | |
9771b263 | 4028 | FOR_EACH_VEC_ELT (references, i, ref) |
ed91d661 | 4029 | { |
a3698dfc | 4030 | dr = create_data_ref (nest, loop, ref->ref, stmt, ref->is_read); |
ed91d661 | 4031 | gcc_assert (dr != NULL); |
9771b263 | 4032 | datarefs->safe_push (dr); |
ed91d661 SP |
4033 | } |
4034 | ||
ed91d661 SP |
4035 | return ret; |
4036 | } | |
4037 | ||
a70d6342 IR |
4038 | /* Search the data references in LOOP, and record the information into |
4039 | DATAREFS. Returns chrec_dont_know when failing to analyze a | |
4040 | difficult case, returns NULL_TREE otherwise. */ | |
4041 | ||
bfe068c3 | 4042 | tree |
a70d6342 | 4043 | find_data_references_in_bb (struct loop *loop, basic_block bb, |
9771b263 | 4044 | vec<data_reference_p> *datarefs) |
a70d6342 IR |
4045 | { |
4046 | gimple_stmt_iterator bsi; | |
4047 | ||
4048 | for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
4049 | { | |
355fe088 | 4050 | gimple *stmt = gsi_stmt (bsi); |
a70d6342 IR |
4051 | |
4052 | if (!find_data_references_in_stmt (loop, stmt, datarefs)) | |
4053 | { | |
4054 | struct data_reference *res; | |
4055 | res = XCNEW (struct data_reference); | |
9771b263 | 4056 | datarefs->safe_push (res); |
a70d6342 IR |
4057 | |
4058 | return chrec_dont_know; | |
4059 | } | |
4060 | } | |
4061 | ||
4062 | return NULL_TREE; | |
4063 | } | |
4064 | ||
56cf8686 SP |
4065 | /* Search the data references in LOOP, and record the information into |
4066 | DATAREFS. Returns chrec_dont_know when failing to analyze a | |
4067 | difficult case, returns NULL_TREE otherwise. | |
3cb960c7 | 4068 | |
464f49d8 DB |
4069 | TODO: This function should be made smarter so that it can handle address |
4070 | arithmetic as if they were array accesses, etc. */ | |
56cf8686 | 4071 | |
fcac74a1 | 4072 | tree |
ebf78a47 | 4073 | find_data_references_in_loop (struct loop *loop, |
9771b263 | 4074 | vec<data_reference_p> *datarefs) |
56cf8686 | 4075 | { |
ccbdbf0a JL |
4076 | basic_block bb, *bbs; |
4077 | unsigned int i; | |
86df10e3 | 4078 | |
bbc8a8dc | 4079 | bbs = get_loop_body_in_dom_order (loop); |
ccbdbf0a JL |
4080 | |
4081 | for (i = 0; i < loop->num_nodes; i++) | |
56cf8686 | 4082 | { |
ccbdbf0a JL |
4083 | bb = bbs[i]; |
4084 | ||
a70d6342 IR |
4085 | if (find_data_references_in_bb (loop, bb, datarefs) == chrec_dont_know) |
4086 | { | |
4087 | free (bbs); | |
4088 | return chrec_dont_know; | |
4089 | } | |
56cf8686 | 4090 | } |
ccbdbf0a JL |
4091 | free (bbs); |
4092 | ||
4aad410d | 4093 | return NULL_TREE; |
56cf8686 SP |
4094 | } |
4095 | ||
ba42e045 SP |
4096 | /* Recursive helper function. */ |
4097 | ||
4098 | static bool | |
9771b263 | 4099 | find_loop_nest_1 (struct loop *loop, vec<loop_p> *loop_nest) |
ba42e045 SP |
4100 | { |
4101 | /* Inner loops of the nest should not contain siblings. Example: | |
4102 | when there are two consecutive loops, | |
4103 | ||
4104 | | loop_0 | |
4105 | | loop_1 | |
4106 | | A[{0, +, 1}_1] | |
4107 | | endloop_1 | |
4108 | | loop_2 | |
4109 | | A[{0, +, 1}_2] | |
4110 | | endloop_2 | |
4111 | | endloop_0 | |
4112 | ||
4113 | the dependence relation cannot be captured by the distance | |
4114 | abstraction. */ | |
4115 | if (loop->next) | |
4116 | return false; | |
56cf8686 | 4117 | |
9771b263 | 4118 | loop_nest->safe_push (loop); |
ba42e045 SP |
4119 | if (loop->inner) |
4120 | return find_loop_nest_1 (loop->inner, loop_nest); | |
4121 | return true; | |
4122 | } | |
4123 | ||
4124 | /* Return false when the LOOP is not well nested. Otherwise return | |
4125 | true and insert in LOOP_NEST the loops of the nest. LOOP_NEST will | |
4126 | contain the loops from the outermost to the innermost, as they will | |
4127 | appear in the classic distance vector. */ | |
4128 | ||
5417e022 | 4129 | bool |
9771b263 | 4130 | find_loop_nest (struct loop *loop, vec<loop_p> *loop_nest) |
ba42e045 | 4131 | { |
9771b263 | 4132 | loop_nest->safe_push (loop); |
ba42e045 SP |
4133 | if (loop->inner) |
4134 | return find_loop_nest_1 (loop->inner, loop_nest); | |
4135 | return true; | |
4136 | } | |
56cf8686 | 4137 | |
9f275479 JS |
4138 | /* Returns true when the data dependences have been computed, false otherwise. |
4139 | Given a loop nest LOOP, the following vectors are returned: | |
b8698a0f L |
4140 | DATAREFS is initialized to all the array elements contained in this loop, |
4141 | DEPENDENCE_RELATIONS contains the relations between the data references. | |
4142 | Compute read-read and self relations if | |
86a07404 | 4143 | COMPUTE_SELF_AND_READ_READ_DEPENDENCES is TRUE. */ |
56cf8686 | 4144 | |
9f275479 | 4145 | bool |
b8698a0f | 4146 | compute_data_dependences_for_loop (struct loop *loop, |
86a07404 | 4147 | bool compute_self_and_read_read_dependences, |
9771b263 DN |
4148 | vec<loop_p> *loop_nest, |
4149 | vec<data_reference_p> *datarefs, | |
4150 | vec<ddr_p> *dependence_relations) | |
56cf8686 | 4151 | { |
9f275479 | 4152 | bool res = true; |
86a07404 | 4153 | |
0ff4040e | 4154 | memset (&dependence_stats, 0, sizeof (dependence_stats)); |
56cf8686 | 4155 | |
b8698a0f | 4156 | /* If the loop nest is not well formed, or one of the data references |
ba42e045 SP |
4157 | is not computable, give up without spending time to compute other |
4158 | dependences. */ | |
3cb960c7 | 4159 | if (!loop |
01be8516 | 4160 | || !find_loop_nest (loop, loop_nest) |
3881dee9 AB |
4161 | || find_data_references_in_loop (loop, datarefs) == chrec_dont_know |
4162 | || !compute_all_dependences (*datarefs, dependence_relations, *loop_nest, | |
4163 | compute_self_and_read_read_dependences)) | |
4164 | res = false; | |
0ff4040e SP |
4165 | |
4166 | if (dump_file && (dump_flags & TDF_STATS)) | |
56cf8686 | 4167 | { |
0ff4040e SP |
4168 | fprintf (dump_file, "Dependence tester statistics:\n"); |
4169 | ||
b8698a0f | 4170 | fprintf (dump_file, "Number of dependence tests: %d\n", |
0ff4040e | 4171 | dependence_stats.num_dependence_tests); |
b8698a0f | 4172 | fprintf (dump_file, "Number of dependence tests classified dependent: %d\n", |
0ff4040e | 4173 | dependence_stats.num_dependence_dependent); |
b8698a0f | 4174 | fprintf (dump_file, "Number of dependence tests classified independent: %d\n", |
0ff4040e | 4175 | dependence_stats.num_dependence_independent); |
b8698a0f | 4176 | fprintf (dump_file, "Number of undetermined dependence tests: %d\n", |
0ff4040e SP |
4177 | dependence_stats.num_dependence_undetermined); |
4178 | ||
b8698a0f | 4179 | fprintf (dump_file, "Number of subscript tests: %d\n", |
0ff4040e | 4180 | dependence_stats.num_subscript_tests); |
b8698a0f | 4181 | fprintf (dump_file, "Number of undetermined subscript tests: %d\n", |
0ff4040e | 4182 | dependence_stats.num_subscript_undetermined); |
b8698a0f | 4183 | fprintf (dump_file, "Number of same subscript function: %d\n", |
0ff4040e SP |
4184 | dependence_stats.num_same_subscript_function); |
4185 | ||
4186 | fprintf (dump_file, "Number of ziv tests: %d\n", | |
4187 | dependence_stats.num_ziv); | |
4188 | fprintf (dump_file, "Number of ziv tests returning dependent: %d\n", | |
4189 | dependence_stats.num_ziv_dependent); | |
4190 | fprintf (dump_file, "Number of ziv tests returning independent: %d\n", | |
4191 | dependence_stats.num_ziv_independent); | |
4192 | fprintf (dump_file, "Number of ziv tests unimplemented: %d\n", | |
b8698a0f | 4193 | dependence_stats.num_ziv_unimplemented); |
0ff4040e | 4194 | |
b8698a0f | 4195 | fprintf (dump_file, "Number of siv tests: %d\n", |
0ff4040e SP |
4196 | dependence_stats.num_siv); |
4197 | fprintf (dump_file, "Number of siv tests returning dependent: %d\n", | |
4198 | dependence_stats.num_siv_dependent); | |
4199 | fprintf (dump_file, "Number of siv tests returning independent: %d\n", | |
4200 | dependence_stats.num_siv_independent); | |
4201 | fprintf (dump_file, "Number of siv tests unimplemented: %d\n", | |
4202 | dependence_stats.num_siv_unimplemented); | |
4203 | ||
b8698a0f | 4204 | fprintf (dump_file, "Number of miv tests: %d\n", |
0ff4040e SP |
4205 | dependence_stats.num_miv); |
4206 | fprintf (dump_file, "Number of miv tests returning dependent: %d\n", | |
4207 | dependence_stats.num_miv_dependent); | |
4208 | fprintf (dump_file, "Number of miv tests returning independent: %d\n", | |
4209 | dependence_stats.num_miv_independent); | |
4210 | fprintf (dump_file, "Number of miv tests unimplemented: %d\n", | |
4211 | dependence_stats.num_miv_unimplemented); | |
9f275479 JS |
4212 | } |
4213 | ||
4214 | return res; | |
56cf8686 SP |
4215 | } |
4216 | ||
36d59cf7 DB |
4217 | /* Free the memory used by a data dependence relation DDR. */ |
4218 | ||
4219 | void | |
4220 | free_dependence_relation (struct data_dependence_relation *ddr) | |
4221 | { | |
4222 | if (ddr == NULL) | |
4223 | return; | |
4224 | ||
9771b263 | 4225 | if (DDR_SUBSCRIPTS (ddr).exists ()) |
d93817c4 | 4226 | free_subscripts (DDR_SUBSCRIPTS (ddr)); |
9771b263 DN |
4227 | DDR_DIST_VECTS (ddr).release (); |
4228 | DDR_DIR_VECTS (ddr).release (); | |
ebf78a47 | 4229 | |
36d59cf7 DB |
4230 | free (ddr); |
4231 | } | |
4232 | ||
4233 | /* Free the memory used by the data dependence relations from | |
4234 | DEPENDENCE_RELATIONS. */ | |
4235 | ||
b8698a0f | 4236 | void |
9771b263 | 4237 | free_dependence_relations (vec<ddr_p> dependence_relations) |
36d59cf7 DB |
4238 | { |
4239 | unsigned int i; | |
ebf78a47 | 4240 | struct data_dependence_relation *ddr; |
36d59cf7 | 4241 | |
9771b263 | 4242 | FOR_EACH_VEC_ELT (dependence_relations, i, ddr) |
01be8516 | 4243 | if (ddr) |
3ac57120 | 4244 | free_dependence_relation (ddr); |
ebf78a47 | 4245 | |
9771b263 | 4246 | dependence_relations.release (); |
56cf8686 SP |
4247 | } |
4248 | ||
36d59cf7 DB |
4249 | /* Free the memory used by the data references from DATAREFS. */ |
4250 | ||
4251 | void | |
9771b263 | 4252 | free_data_refs (vec<data_reference_p> datarefs) |
36d59cf7 DB |
4253 | { |
4254 | unsigned int i; | |
ebf78a47 | 4255 | struct data_reference *dr; |
56cf8686 | 4256 | |
9771b263 | 4257 | FOR_EACH_VEC_ELT (datarefs, i, dr) |
8fdbc9c6 | 4258 | free_data_ref (dr); |
9771b263 | 4259 | datarefs.release (); |
36d59cf7 | 4260 | } |