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48e1416a | 1 | /* Data references and dependences detectors. |
fbd26352 | 2 | Copyright (C) 2003-2019 Free Software Foundation, Inc. |
6b421feb | 3 | Contributed by Sebastian Pop <pop@cri.ensmp.fr> |
2146e26d | 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 | |
8c4c00c1 | 9 | Software Foundation; either version 3, or (at your option) any later |
2146e26d | 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 | |
8c4c00c1 | 18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
2146e26d | 20 | |
21 | #ifndef GCC_TREE_DATA_REF_H | |
22 | #define GCC_TREE_DATA_REF_H | |
23 | ||
74c8f69a | 24 | #include "graphds.h" |
801c5610 | 25 | #include "tree-chrec.h" |
ed9370cc | 26 | #include "opt-problem.h" |
6b6f234c | 27 | |
6b8dbb53 | 28 | /* |
80bb306a | 29 | innermost_loop_behavior describes the evolution of the address of the memory |
30 | reference in the innermost enclosing loop. The address is expressed as | |
31 | BASE + STEP * # of iteration, and base is further decomposed as the base | |
32 | pointer (BASE_ADDRESS), loop invariant offset (OFFSET) and | |
48e1416a | 33 | constant offset (INIT). Examples, in loop nest |
34 | ||
80bb306a | 35 | for (i = 0; i < 100; i++) |
36 | for (j = 3; j < 100; j++) | |
6b8dbb53 | 37 | |
516849c7 | 38 | Example 1 Example 2 |
80bb306a | 39 | data-ref a[j].b[i][j] *(p + x + 16B + 4B * j) |
48e1416a | 40 | |
801c5610 | 41 | |
80bb306a | 42 | innermost_loop_behavior |
43 | base_address &a p | |
44 | offset i * D_i x | |
45 | init 3 * D_j + offsetof (b) 28 | |
516849c7 | 46 | step D_j 4 |
516849c7 | 47 | |
6b8dbb53 | 48 | */ |
80bb306a | 49 | struct innermost_loop_behavior |
516849c7 | 50 | { |
51 | tree base_address; | |
52 | tree offset; | |
53 | tree init; | |
54 | tree step; | |
80bb306a | 55 | |
a5456a6d | 56 | /* BASE_ADDRESS is known to be misaligned by BASE_MISALIGNMENT bytes |
57 | from an alignment boundary of BASE_ALIGNMENT bytes. For example, | |
58 | if we had: | |
59 | ||
60 | struct S __attribute__((aligned(16))) { ... }; | |
61 | ||
62 | char *ptr; | |
63 | ... *(struct S *) (ptr - 4) ...; | |
64 | ||
65 | the information would be: | |
66 | ||
67 | base_address: ptr | |
68 | base_aligment: 16 | |
69 | base_misalignment: 4 | |
70 | init: -4 | |
71 | ||
72 | where init cancels the base misalignment. If instead we had a | |
73 | reference to a particular field: | |
74 | ||
75 | struct S __attribute__((aligned(16))) { ... int f; ... }; | |
76 | ||
77 | char *ptr; | |
78 | ... ((struct S *) (ptr - 4))->f ...; | |
79 | ||
80 | the information would be: | |
81 | ||
82 | base_address: ptr | |
83 | base_aligment: 16 | |
84 | base_misalignment: 4 | |
85 | init: -4 + offsetof (S, f) | |
86 | ||
87 | where base_address + init might also be misaligned, and by a different | |
88 | amount from base_address. */ | |
89 | unsigned int base_alignment; | |
90 | unsigned int base_misalignment; | |
91 | ||
a7e05ef2 | 92 | /* The largest power of two that divides OFFSET, capped to a suitably |
93 | high value if the offset is zero. This is a byte rather than a bit | |
94 | quantity. */ | |
95 | unsigned int offset_alignment; | |
668dd7dc | 96 | |
97 | /* Likewise for STEP. */ | |
98 | unsigned int step_alignment; | |
516849c7 | 99 | }; |
100 | ||
80bb306a | 101 | /* Describes the evolutions of indices of the memory reference. The indices |
95539e1d | 102 | are indices of the ARRAY_REFs, indexes in artificial dimensions |
103 | added for member selection of records and the operands of MEM_REFs. | |
104 | BASE_OBJECT is the part of the reference that is loop-invariant | |
105 | (note that this reference does not have to cover the whole object | |
106 | being accessed, in which case UNCONSTRAINED_BASE is set; hence it is | |
107 | not recommended to use BASE_OBJECT in any code generation). | |
108 | For the examples above, | |
109 | ||
110 | base_object: a *(p + x + 4B * j_0) | |
80bb306a | 111 | indices: {j_0, +, 1}_2 {16, +, 4}_2 |
95539e1d | 112 | 4 |
80bb306a | 113 | {i_0, +, 1}_1 |
114 | {j_0, +, 1}_2 | |
115 | */ | |
116 | ||
117 | struct indices | |
516849c7 | 118 | { |
119 | /* The object. */ | |
120 | tree base_object; | |
48e1416a | 121 | |
80bb306a | 122 | /* A list of chrecs. Access functions of the indices. */ |
f1f41a6c | 123 | vec<tree> access_fns; |
f146c442 | 124 | |
125 | /* Whether BASE_OBJECT is an access representing the whole object | |
126 | or whether the access could not be constrained. */ | |
127 | bool unconstrained_base; | |
516849c7 | 128 | }; |
129 | ||
80bb306a | 130 | struct dr_alias |
131 | { | |
132 | /* The alias information that should be used for new pointers to this | |
95539e1d | 133 | location. */ |
80bb306a | 134 | struct ptr_info_def *ptr_info; |
516849c7 | 135 | }; |
136 | ||
e01f9f1f | 137 | /* An integer vector. A vector formally consists of an element of a vector |
138 | space. A vector space is a set that is closed under vector addition | |
139 | and scalar multiplication. In this vector space, an element is a list of | |
140 | integers. */ | |
7652827d | 141 | typedef HOST_WIDE_INT lambda_int; |
142 | typedef lambda_int *lambda_vector; | |
e01f9f1f | 143 | |
144 | /* An integer matrix. A matrix consists of m vectors of length n (IE | |
145 | all vectors are the same length). */ | |
146 | typedef lambda_vector *lambda_matrix; | |
147 | ||
b79b3386 | 148 | |
b79b3386 | 149 | |
6b6f234c | 150 | struct data_reference |
2146e26d | 151 | { |
2146e26d | 152 | /* A pointer to the statement that contains this DR. */ |
42acab1c | 153 | gimple *stmt; |
48e1416a | 154 | |
80bb306a | 155 | /* A pointer to the memory reference. */ |
2146e26d | 156 | tree ref; |
157 | ||
2146e26d | 158 | /* Auxiliary info specific to a pass. */ |
5c205353 | 159 | void *aux; |
2146e26d | 160 | |
161 | /* True when the data reference is in RHS of a stmt. */ | |
162 | bool is_read; | |
163 | ||
4f372c2c | 164 | /* True when the data reference is conditional within STMT, |
165 | i.e. if it might not occur even when the statement is executed | |
166 | and runs to completion. */ | |
167 | bool is_conditional_in_stmt; | |
168 | ||
80bb306a | 169 | /* Behavior of the memory reference in the innermost loop. */ |
170 | struct innermost_loop_behavior innermost; | |
516849c7 | 171 | |
255b6be7 | 172 | /* Subscripts of this data reference. */ |
80bb306a | 173 | struct indices indices; |
516849c7 | 174 | |
80bb306a | 175 | /* Alias information for the data reference. */ |
176 | struct dr_alias alias; | |
b79b3386 | 177 | }; |
41c7a324 | 178 | |
516849c7 | 179 | #define DR_STMT(DR) (DR)->stmt |
180 | #define DR_REF(DR) (DR)->ref | |
80bb306a | 181 | #define DR_BASE_OBJECT(DR) (DR)->indices.base_object |
f146c442 | 182 | #define DR_UNCONSTRAINED_BASE(DR) (DR)->indices.unconstrained_base |
80bb306a | 183 | #define DR_ACCESS_FNS(DR) (DR)->indices.access_fns |
f1f41a6c | 184 | #define DR_ACCESS_FN(DR, I) DR_ACCESS_FNS (DR)[I] |
185 | #define DR_NUM_DIMENSIONS(DR) DR_ACCESS_FNS (DR).length () | |
516849c7 | 186 | #define DR_IS_READ(DR) (DR)->is_read |
9ff25603 | 187 | #define DR_IS_WRITE(DR) (!DR_IS_READ (DR)) |
4f372c2c | 188 | #define DR_IS_CONDITIONAL_IN_STMT(DR) (DR)->is_conditional_in_stmt |
80bb306a | 189 | #define DR_BASE_ADDRESS(DR) (DR)->innermost.base_address |
190 | #define DR_OFFSET(DR) (DR)->innermost.offset | |
191 | #define DR_INIT(DR) (DR)->innermost.init | |
192 | #define DR_STEP(DR) (DR)->innermost.step | |
80bb306a | 193 | #define DR_PTR_INFO(DR) (DR)->alias.ptr_info |
a5456a6d | 194 | #define DR_BASE_ALIGNMENT(DR) (DR)->innermost.base_alignment |
195 | #define DR_BASE_MISALIGNMENT(DR) (DR)->innermost.base_misalignment | |
a7e05ef2 | 196 | #define DR_OFFSET_ALIGNMENT(DR) (DR)->innermost.offset_alignment |
668dd7dc | 197 | #define DR_STEP_ALIGNMENT(DR) (DR)->innermost.step_alignment |
bd6f374c | 198 | #define DR_INNERMOST(DR) (DR)->innermost |
b79b3386 | 199 | |
200 | typedef struct data_reference *data_reference_p; | |
2146e26d | 201 | |
cea441fd | 202 | /* This struct is used to store the information of a data reference, |
203 | including the data ref itself and the segment length for aliasing | |
204 | checks. This is used to merge alias checks. */ | |
205 | ||
206 | struct dr_with_seg_len | |
207 | { | |
e85b4a5e | 208 | dr_with_seg_len (data_reference_p d, tree len, unsigned HOST_WIDE_INT size, |
209 | unsigned int a) | |
210 | : dr (d), seg_len (len), access_size (size), align (a) {} | |
cea441fd | 211 | |
212 | data_reference_p dr; | |
e85b4a5e | 213 | /* The offset of the last access that needs to be checked minus |
214 | the offset of the first. */ | |
cea441fd | 215 | tree seg_len; |
e85b4a5e | 216 | /* A value that, when added to abs (SEG_LEN), gives the total number of |
217 | bytes in the segment. */ | |
218 | poly_uint64 access_size; | |
219 | /* The minimum common alignment of DR's start address, SEG_LEN and | |
220 | ACCESS_SIZE. */ | |
221 | unsigned int align; | |
cea441fd | 222 | }; |
223 | ||
224 | /* This struct contains two dr_with_seg_len objects with aliasing data | |
225 | refs. Two comparisons are generated from them. */ | |
226 | ||
227 | struct dr_with_seg_len_pair_t | |
228 | { | |
229 | dr_with_seg_len_pair_t (const dr_with_seg_len& d1, | |
230 | const dr_with_seg_len& d2) | |
231 | : first (d1), second (d2) {} | |
232 | ||
233 | dr_with_seg_len first; | |
234 | dr_with_seg_len second; | |
235 | }; | |
236 | ||
2146e26d | 237 | enum data_dependence_direction { |
48e1416a | 238 | dir_positive, |
239 | dir_negative, | |
240 | dir_equal, | |
2146e26d | 241 | dir_positive_or_negative, |
242 | dir_positive_or_equal, | |
243 | dir_negative_or_equal, | |
244 | dir_star, | |
245 | dir_independent | |
246 | }; | |
247 | ||
87da4f2e | 248 | /* The description of the grid of iterations that overlap. At most |
249 | two loops are considered at the same time just now, hence at most | |
250 | two functions are needed. For each of the functions, we store | |
251 | the vector of coefficients, f[0] + x * f[1] + y * f[2] + ..., | |
252 | where x, y, ... are variables. */ | |
253 | ||
254 | #define MAX_DIM 2 | |
255 | ||
256 | /* Special values of N. */ | |
257 | #define NO_DEPENDENCE 0 | |
258 | #define NOT_KNOWN (MAX_DIM + 1) | |
259 | #define CF_NONTRIVIAL_P(CF) ((CF)->n != NO_DEPENDENCE && (CF)->n != NOT_KNOWN) | |
260 | #define CF_NOT_KNOWN_P(CF) ((CF)->n == NOT_KNOWN) | |
261 | #define CF_NO_DEPENDENCE_P(CF) ((CF)->n == NO_DEPENDENCE) | |
262 | ||
f1f41a6c | 263 | typedef vec<tree> affine_fn; |
87da4f2e | 264 | |
b3e7c666 | 265 | struct conflict_function |
87da4f2e | 266 | { |
267 | unsigned n; | |
268 | affine_fn fns[MAX_DIM]; | |
b3e7c666 | 269 | }; |
87da4f2e | 270 | |
2146e26d | 271 | /* What is a subscript? Given two array accesses a subscript is the |
272 | tuple composed of the access functions for a given dimension. | |
273 | Example: Given A[f1][f2][f3] and B[g1][g2][g3], there are three | |
274 | subscripts: (f1, g1), (f2, g2), (f3, g3). These three subscripts | |
275 | are stored in the data_dependence_relation structure under the form | |
276 | of an array of subscripts. */ | |
277 | ||
6b6f234c | 278 | struct subscript |
2146e26d | 279 | { |
403965f7 | 280 | /* The access functions of the two references. */ |
281 | tree access_fn[2]; | |
282 | ||
2146e26d | 283 | /* A description of the iterations for which the elements are |
284 | accessed twice. */ | |
87da4f2e | 285 | conflict_function *conflicting_iterations_in_a; |
286 | conflict_function *conflicting_iterations_in_b; | |
48e1416a | 287 | |
bc3c8ad4 | 288 | /* This field stores the information about the iteration domain |
2146e26d | 289 | validity of the dependence relation. */ |
bc3c8ad4 | 290 | tree last_conflict; |
48e1416a | 291 | |
2146e26d | 292 | /* Distance from the iteration that access a conflicting element in |
293 | A to the iteration that access this same conflicting element in | |
5c9dae64 | 294 | B. The distance is a tree scalar expression, i.e. a constant or a |
2146e26d | 295 | symbolic expression, but certainly not a chrec function. */ |
296 | tree distance; | |
2146e26d | 297 | }; |
298 | ||
41c7a324 | 299 | typedef struct subscript *subscript_p; |
41c7a324 | 300 | |
403965f7 | 301 | #define SUB_ACCESS_FN(SUB, I) (SUB)->access_fn[I] |
643e9393 | 302 | #define SUB_CONFLICTS_IN_A(SUB) (SUB)->conflicting_iterations_in_a |
303 | #define SUB_CONFLICTS_IN_B(SUB) (SUB)->conflicting_iterations_in_b | |
304 | #define SUB_LAST_CONFLICT(SUB) (SUB)->last_conflict | |
305 | #define SUB_DISTANCE(SUB) (SUB)->distance | |
2146e26d | 306 | |
307 | /* A data_dependence_relation represents a relation between two | |
308 | data_references A and B. */ | |
309 | ||
6b6f234c | 310 | struct data_dependence_relation |
2146e26d | 311 | { |
48e1416a | 312 | |
2146e26d | 313 | struct data_reference *a; |
314 | struct data_reference *b; | |
315 | ||
316 | /* A "yes/no/maybe" field for the dependence relation: | |
48e1416a | 317 | |
2146e26d | 318 | - when "ARE_DEPENDENT == NULL_TREE", there exist a dependence |
319 | relation between A and B, and the description of this relation | |
320 | is given in the SUBSCRIPTS array, | |
48e1416a | 321 | |
2146e26d | 322 | - when "ARE_DEPENDENT == chrec_known", there is no dependence and |
323 | SUBSCRIPTS is empty, | |
48e1416a | 324 | |
2146e26d | 325 | - when "ARE_DEPENDENT == chrec_dont_know", there may be a dependence, |
326 | but the analyzer cannot be more specific. */ | |
327 | tree are_dependent; | |
48e1416a | 328 | |
f68a7726 | 329 | /* If nonnull, COULD_BE_INDEPENDENT_P is true and the accesses are |
330 | independent when the runtime addresses of OBJECT_A and OBJECT_B | |
331 | are different. The addresses of both objects are invariant in the | |
332 | loop nest. */ | |
333 | tree object_a; | |
334 | tree object_b; | |
335 | ||
2146e26d | 336 | /* For each subscript in the dependence test, there is an element in |
337 | this array. This is the attribute that labels the edge A->B of | |
338 | the data_dependence_relation. */ | |
f1f41a6c | 339 | vec<subscript_p> subscripts; |
6b6f234c | 340 | |
b44d1046 | 341 | /* The analyzed loop nest. */ |
f1f41a6c | 342 | vec<loop_p> loop_nest; |
bc3c8ad4 | 343 | |
6b6f234c | 344 | /* The classic direction vector. */ |
f1f41a6c | 345 | vec<lambda_vector> dir_vects; |
6b6f234c | 346 | |
347 | /* The classic distance vector. */ | |
f1f41a6c | 348 | vec<lambda_vector> dist_vects; |
0ecb94cf | 349 | |
350 | /* Is the dependence reversed with respect to the lexicographic order? */ | |
351 | bool reversed_p; | |
0ac758f7 | 352 | |
353 | /* When the dependence relation is affine, it can be represented by | |
354 | a distance vector. */ | |
355 | bool affine_p; | |
356 | ||
357 | /* Set to true when the dependence relation is on the same data | |
358 | access. */ | |
359 | bool self_reference_p; | |
403965f7 | 360 | |
361 | /* True if the dependence described is conservatively correct rather | |
362 | than exact, and if it is still possible for the accesses to be | |
363 | conditionally independent. For example, the a and b references in: | |
364 | ||
365 | struct s *a, *b; | |
366 | for (int i = 0; i < n; ++i) | |
367 | a->f[i] += b->f[i]; | |
368 | ||
369 | conservatively have a distance vector of (0), for the case in which | |
370 | a == b, but the accesses are independent if a != b. Similarly, | |
371 | the a and b references in: | |
372 | ||
373 | struct s *a, *b; | |
374 | for (int i = 0; i < n; ++i) | |
375 | a[0].f[i] += b[i].f[i]; | |
376 | ||
377 | conservatively have a distance vector of (0), but they are indepenent | |
378 | when a != b + i. In contrast, the references in: | |
379 | ||
380 | struct s *a; | |
381 | for (int i = 0; i < n; ++i) | |
382 | a->f[i] += a->f[i]; | |
383 | ||
384 | have the same distance vector of (0), but the accesses can never be | |
385 | independent. */ | |
386 | bool could_be_independent_p; | |
2146e26d | 387 | }; |
388 | ||
6b421feb | 389 | typedef struct data_dependence_relation *ddr_p; |
6b421feb | 390 | |
643e9393 | 391 | #define DDR_A(DDR) (DDR)->a |
392 | #define DDR_B(DDR) (DDR)->b | |
393 | #define DDR_AFFINE_P(DDR) (DDR)->affine_p | |
394 | #define DDR_ARE_DEPENDENT(DDR) (DDR)->are_dependent | |
f68a7726 | 395 | #define DDR_OBJECT_A(DDR) (DDR)->object_a |
396 | #define DDR_OBJECT_B(DDR) (DDR)->object_b | |
643e9393 | 397 | #define DDR_SUBSCRIPTS(DDR) (DDR)->subscripts |
f1f41a6c | 398 | #define DDR_SUBSCRIPT(DDR, I) DDR_SUBSCRIPTS (DDR)[I] |
399 | #define DDR_NUM_SUBSCRIPTS(DDR) DDR_SUBSCRIPTS (DDR).length () | |
b44d1046 | 400 | |
643e9393 | 401 | #define DDR_LOOP_NEST(DDR) (DDR)->loop_nest |
b44d1046 | 402 | /* The size of the direction/distance vectors: the number of loops in |
403 | the loop nest. */ | |
f1f41a6c | 404 | #define DDR_NB_LOOPS(DDR) (DDR_LOOP_NEST (DDR).length ()) |
643e9393 | 405 | #define DDR_SELF_REFERENCE(DDR) (DDR)->self_reference_p |
1532ec98 | 406 | |
407 | #define DDR_DIST_VECTS(DDR) ((DDR)->dist_vects) | |
408 | #define DDR_DIR_VECTS(DDR) ((DDR)->dir_vects) | |
409 | #define DDR_NUM_DIST_VECTS(DDR) \ | |
f1f41a6c | 410 | (DDR_DIST_VECTS (DDR).length ()) |
1532ec98 | 411 | #define DDR_NUM_DIR_VECTS(DDR) \ |
f1f41a6c | 412 | (DDR_DIR_VECTS (DDR).length ()) |
1532ec98 | 413 | #define DDR_DIR_VECT(DDR, I) \ |
f1f41a6c | 414 | DDR_DIR_VECTS (DDR)[I] |
1532ec98 | 415 | #define DDR_DIST_VECT(DDR, I) \ |
f1f41a6c | 416 | DDR_DIST_VECTS (DDR)[I] |
643e9393 | 417 | #define DDR_REVERSED_P(DDR) (DDR)->reversed_p |
403965f7 | 418 | #define DDR_COULD_BE_INDEPENDENT_P(DDR) (DDR)->could_be_independent_p |
2146e26d | 419 | |
420 | \f | |
ed9370cc | 421 | opt_result dr_analyze_innermost (innermost_loop_behavior *, tree, |
422 | struct loop *, const gimple *); | |
b79b3386 | 423 | extern bool compute_data_dependences_for_loop (struct loop *, bool, |
f1f41a6c | 424 | vec<loop_p> *, |
425 | vec<data_reference_p> *, | |
426 | vec<ddr_p> *); | |
f1f41a6c | 427 | extern void debug_ddrs (vec<ddr_p> ); |
2146e26d | 428 | extern void dump_data_reference (FILE *, struct data_reference *); |
c7d89805 | 429 | extern void debug (data_reference &ref); |
430 | extern void debug (data_reference *ptr); | |
5df4cc8d | 431 | extern void debug_data_reference (struct data_reference *); |
f1f41a6c | 432 | extern void debug_data_references (vec<data_reference_p> ); |
c7d89805 | 433 | extern void debug (vec<data_reference_p> &ref); |
434 | extern void debug (vec<data_reference_p> *ptr); | |
b44d1046 | 435 | extern void debug_data_dependence_relation (struct data_dependence_relation *); |
f1f41a6c | 436 | extern void dump_data_dependence_relations (FILE *, vec<ddr_p> ); |
c7d89805 | 437 | extern void debug (vec<ddr_p> &ref); |
438 | extern void debug (vec<ddr_p> *ptr); | |
f1f41a6c | 439 | extern void debug_data_dependence_relations (vec<ddr_p> ); |
6b6f234c | 440 | extern void free_dependence_relation (struct data_dependence_relation *); |
f1f41a6c | 441 | extern void free_dependence_relations (vec<ddr_p> ); |
801c5610 | 442 | extern void free_data_ref (data_reference_p); |
f1f41a6c | 443 | extern void free_data_refs (vec<data_reference_p> ); |
ed9370cc | 444 | extern opt_result find_data_references_in_stmt (struct loop *, gimple *, |
445 | vec<data_reference_p> *); | |
453841f9 | 446 | extern bool graphite_find_data_references_in_stmt (edge, loop_p, gimple *, |
f1f41a6c | 447 | vec<data_reference_p> *); |
07e3bcbf | 448 | tree find_data_references_in_loop (struct loop *, vec<data_reference_p> *); |
fa4dba85 | 449 | bool loop_nest_has_data_refs (loop_p loop); |
453841f9 | 450 | struct data_reference *create_data_ref (edge, loop_p, tree, gimple *, bool, |
4f372c2c | 451 | bool); |
f1f41a6c | 452 | extern bool find_loop_nest (struct loop *, vec<loop_p> *); |
16dfb112 | 453 | extern struct data_dependence_relation *initialize_data_dependence_relation |
f1f41a6c | 454 | (struct data_reference *, struct data_reference *, vec<loop_p>); |
7b6f8db4 | 455 | extern void compute_affine_dependence (struct data_dependence_relation *, |
456 | loop_p); | |
16dfb112 | 457 | extern void compute_self_dependence (struct data_dependence_relation *); |
f1f41a6c | 458 | extern bool compute_all_dependences (vec<data_reference_p> , |
459 | vec<ddr_p> *, | |
460 | vec<loop_p>, bool); | |
ec611e12 | 461 | extern tree find_data_references_in_bb (struct loop *, basic_block, |
f1f41a6c | 462 | vec<data_reference_p> *); |
5528b2de | 463 | extern unsigned int dr_alignment (innermost_loop_behavior *); |
469f7bc0 | 464 | extern tree get_base_for_alignment (tree, unsigned int *); |
5528b2de | 465 | |
466 | /* Return the alignment in bytes that DR is guaranteed to have at all | |
467 | times. */ | |
468 | ||
469 | inline unsigned int | |
470 | dr_alignment (data_reference *dr) | |
471 | { | |
472 | return dr_alignment (&DR_INNERMOST (dr)); | |
473 | } | |
255b6be7 | 474 | |
255b6be7 | 475 | extern bool dr_may_alias_p (const struct data_reference *, |
1b4e6584 | 476 | const struct data_reference *, struct loop *); |
ec611e12 | 477 | extern bool dr_equal_offsets_p (struct data_reference *, |
478 | struct data_reference *); | |
e1cc68bd | 479 | |
ed9370cc | 480 | extern opt_result runtime_alias_check_p (ddr_p, struct loop *, bool); |
38f2f513 | 481 | extern int data_ref_compare_tree (tree, tree); |
cea441fd | 482 | extern void prune_runtime_alias_test_list (vec<dr_with_seg_len_pair_t> *, |
886901f4 | 483 | poly_uint64); |
49ce332c | 484 | extern void create_runtime_alias_checks (struct loop *, |
485 | vec<dr_with_seg_len_pair_t> *, tree*); | |
e85b4a5e | 486 | extern tree dr_direction_indicator (struct data_reference *); |
487 | extern tree dr_zero_step_indicator (struct data_reference *); | |
488 | extern bool dr_known_forward_stride_p (struct data_reference *); | |
489 | ||
e1cc68bd | 490 | /* Return true when the base objects of data references A and B are |
491 | the same memory object. */ | |
492 | ||
493 | static inline bool | |
494 | same_data_refs_base_objects (data_reference_p a, data_reference_p b) | |
495 | { | |
496 | return DR_NUM_DIMENSIONS (a) == DR_NUM_DIMENSIONS (b) | |
497 | && operand_equal_p (DR_BASE_OBJECT (a), DR_BASE_OBJECT (b), 0); | |
498 | } | |
499 | ||
500 | /* Return true when the data references A and B are accessing the same | |
501 | memory object with the same access functions. */ | |
502 | ||
503 | static inline bool | |
504 | same_data_refs (data_reference_p a, data_reference_p b) | |
505 | { | |
506 | unsigned int i; | |
507 | ||
508 | /* The references are exactly the same. */ | |
509 | if (operand_equal_p (DR_REF (a), DR_REF (b), 0)) | |
510 | return true; | |
511 | ||
512 | if (!same_data_refs_base_objects (a, b)) | |
513 | return false; | |
514 | ||
515 | for (i = 0; i < DR_NUM_DIMENSIONS (a); i++) | |
516 | if (!eq_evolutions_p (DR_ACCESS_FN (a, i), DR_ACCESS_FN (b, i))) | |
517 | return false; | |
518 | ||
519 | return true; | |
520 | } | |
521 | ||
15c8650d | 522 | /* Returns true when all the dependences are computable. */ |
523 | ||
524 | inline bool | |
525 | known_dependences_p (vec<ddr_p> dependence_relations) | |
526 | { | |
527 | ddr_p ddr; | |
528 | unsigned int i; | |
529 | ||
530 | FOR_EACH_VEC_ELT (dependence_relations, i, ddr) | |
531 | if (DDR_ARE_DEPENDENT (ddr) == chrec_dont_know) | |
532 | return false; | |
533 | ||
534 | return true; | |
535 | } | |
536 | ||
e01f9f1f | 537 | /* Returns the dependence level for a vector DIST of size LENGTH. |
538 | LEVEL = 0 means a lexicographic dependence, i.e. a dependence due | |
539 | to the sequence of statements, not carried by any loop. */ | |
540 | ||
541 | static inline unsigned | |
542 | dependence_level (lambda_vector dist_vect, int length) | |
543 | { | |
544 | int i; | |
545 | ||
546 | for (i = 0; i < length; i++) | |
547 | if (dist_vect[i] != 0) | |
548 | return i + 1; | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
801c5610 | 553 | /* Return the dependence level for the DDR relation. */ |
554 | ||
555 | static inline unsigned | |
556 | ddr_dependence_level (ddr_p ddr) | |
557 | { | |
558 | unsigned vector; | |
559 | unsigned level = 0; | |
560 | ||
f1f41a6c | 561 | if (DDR_DIST_VECTS (ddr).exists ()) |
801c5610 | 562 | level = dependence_level (DDR_DIST_VECT (ddr, 0), DDR_NB_LOOPS (ddr)); |
563 | ||
564 | for (vector = 1; vector < DDR_NUM_DIST_VECTS (ddr); vector++) | |
565 | level = MIN (level, dependence_level (DDR_DIST_VECT (ddr, vector), | |
566 | DDR_NB_LOOPS (ddr))); | |
567 | return level; | |
568 | } | |
569 | ||
b44d1046 | 570 | /* Return the index of the variable VAR in the LOOP_NEST array. */ |
571 | ||
572 | static inline int | |
f1f41a6c | 573 | index_in_loop_nest (int var, vec<loop_p> loop_nest) |
b44d1046 | 574 | { |
575 | struct loop *loopi; | |
576 | int var_index; | |
577 | ||
2199e93e | 578 | for (var_index = 0; loop_nest.iterate (var_index, &loopi); var_index++) |
b44d1046 | 579 | if (loopi->num == var) |
2199e93e | 580 | return var_index; |
b44d1046 | 581 | |
2199e93e | 582 | gcc_unreachable (); |
b44d1046 | 583 | } |
584 | ||
6198d968 | 585 | /* Returns true when the data reference DR the form "A[i] = ..." |
586 | with a stride equal to its unit type size. */ | |
1c4f9959 | 587 | |
588 | static inline bool | |
f689d33d | 589 | adjacent_dr_p (struct data_reference *dr) |
1c4f9959 | 590 | { |
6198d968 | 591 | /* If this is a bitfield store bail out. */ |
592 | if (TREE_CODE (DR_REF (dr)) == COMPONENT_REF | |
593 | && DECL_BIT_FIELD (TREE_OPERAND (DR_REF (dr), 1))) | |
594 | return false; | |
595 | ||
596 | if (!DR_STEP (dr) | |
597 | || TREE_CODE (DR_STEP (dr)) != INTEGER_CST) | |
598 | return false; | |
599 | ||
600 | return tree_int_cst_equal (fold_unary (ABS_EXPR, TREE_TYPE (DR_STEP (dr)), | |
601 | DR_STEP (dr)), | |
602 | TYPE_SIZE_UNIT (TREE_TYPE (DR_REF (dr)))); | |
1c4f9959 | 603 | } |
604 | ||
b0eb8c66 | 605 | void split_constant_offset (tree , tree *, tree *); |
606 | ||
e01f9f1f | 607 | /* Compute the greatest common divisor of a VECTOR of SIZE numbers. */ |
608 | ||
7652827d | 609 | static inline lambda_int |
e01f9f1f | 610 | lambda_vector_gcd (lambda_vector vector, int size) |
611 | { | |
612 | int i; | |
7652827d | 613 | lambda_int gcd1 = 0; |
e01f9f1f | 614 | |
615 | if (size > 0) | |
616 | { | |
617 | gcd1 = vector[0]; | |
618 | for (i = 1; i < size; i++) | |
619 | gcd1 = gcd (gcd1, vector[i]); | |
620 | } | |
621 | return gcd1; | |
622 | } | |
623 | ||
624 | /* Allocate a new vector of given SIZE. */ | |
625 | ||
626 | static inline lambda_vector | |
627 | lambda_vector_new (int size) | |
628 | { | |
eb352584 | 629 | /* ??? We shouldn't abuse the GC allocator here. */ |
7652827d | 630 | return ggc_cleared_vec_alloc<lambda_int> (size); |
e01f9f1f | 631 | } |
632 | ||
633 | /* Clear out vector VEC1 of length SIZE. */ | |
634 | ||
635 | static inline void | |
636 | lambda_vector_clear (lambda_vector vec1, int size) | |
637 | { | |
638 | memset (vec1, 0, size * sizeof (*vec1)); | |
639 | } | |
640 | ||
641 | /* Returns true when the vector V is lexicographically positive, in | |
642 | other words, when the first nonzero element is positive. */ | |
643 | ||
644 | static inline bool | |
645 | lambda_vector_lexico_pos (lambda_vector v, | |
646 | unsigned n) | |
647 | { | |
648 | unsigned i; | |
649 | for (i = 0; i < n; i++) | |
650 | { | |
651 | if (v[i] == 0) | |
652 | continue; | |
653 | if (v[i] < 0) | |
654 | return false; | |
655 | if (v[i] > 0) | |
656 | return true; | |
657 | } | |
658 | return true; | |
659 | } | |
660 | ||
661 | /* Return true if vector VEC1 of length SIZE is the zero vector. */ | |
662 | ||
663 | static inline bool | |
664 | lambda_vector_zerop (lambda_vector vec1, int size) | |
665 | { | |
666 | int i; | |
667 | for (i = 0; i < size; i++) | |
668 | if (vec1[i] != 0) | |
669 | return false; | |
670 | return true; | |
671 | } | |
672 | ||
673 | /* Allocate a matrix of M rows x N cols. */ | |
674 | ||
675 | static inline lambda_matrix | |
676 | lambda_matrix_new (int m, int n, struct obstack *lambda_obstack) | |
677 | { | |
678 | lambda_matrix mat; | |
679 | int i; | |
680 | ||
eb352584 | 681 | mat = XOBNEWVEC (lambda_obstack, lambda_vector, m); |
e01f9f1f | 682 | |
683 | for (i = 0; i < m; i++) | |
7652827d | 684 | mat[i] = XOBNEWVEC (lambda_obstack, lambda_int, n); |
e01f9f1f | 685 | |
686 | return mat; | |
687 | } | |
688 | ||
2146e26d | 689 | #endif /* GCC_TREE_DATA_REF_H */ |