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2146e26d | 1 | /* Data references and dependences detectors. |
12c697cd | 2 | Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
3 | Free Software Foundation, Inc. | |
6b421feb | 4 | Contributed by Sebastian Pop <pop@cri.ensmp.fr> |
2146e26d | 5 | |
6 | This file is part of GCC. | |
7 | ||
8 | GCC is free software; you can redistribute it and/or modify it under | |
9 | the terms of the GNU General Public License as published by the Free | |
8c4c00c1 | 10 | Software Foundation; either version 3, or (at your option) any later |
2146e26d | 11 | version. |
12 | ||
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
8c4c00c1 | 19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
2146e26d | 21 | |
22 | #ifndef GCC_TREE_DATA_REF_H | |
23 | #define GCC_TREE_DATA_REF_H | |
24 | ||
74c8f69a | 25 | #include "graphds.h" |
6b6f234c | 26 | #include "lambda.h" |
355572cc | 27 | #include "omega.h" |
801c5610 | 28 | #include "tree-chrec.h" |
6b6f234c | 29 | |
6b8dbb53 | 30 | /* |
80bb306a | 31 | innermost_loop_behavior describes the evolution of the address of the memory |
32 | reference in the innermost enclosing loop. The address is expressed as | |
33 | BASE + STEP * # of iteration, and base is further decomposed as the base | |
34 | pointer (BASE_ADDRESS), loop invariant offset (OFFSET) and | |
35 | constant offset (INIT). Examples, in loop nest | |
36 | ||
37 | for (i = 0; i < 100; i++) | |
38 | for (j = 3; j < 100; j++) | |
6b8dbb53 | 39 | |
516849c7 | 40 | Example 1 Example 2 |
80bb306a | 41 | data-ref a[j].b[i][j] *(p + x + 16B + 4B * j) |
516849c7 | 42 | |
801c5610 | 43 | |
80bb306a | 44 | innermost_loop_behavior |
45 | base_address &a p | |
46 | offset i * D_i x | |
47 | init 3 * D_j + offsetof (b) 28 | |
516849c7 | 48 | step D_j 4 |
516849c7 | 49 | |
6b8dbb53 | 50 | */ |
80bb306a | 51 | struct innermost_loop_behavior |
516849c7 | 52 | { |
53 | tree base_address; | |
54 | tree offset; | |
55 | tree init; | |
56 | tree step; | |
80bb306a | 57 | |
58 | /* Alignment information. ALIGNED_TO is set to the largest power of two | |
59 | that divides OFFSET. */ | |
60 | tree aligned_to; | |
516849c7 | 61 | }; |
62 | ||
80bb306a | 63 | /* Describes the evolutions of indices of the memory reference. The indices |
64 | are indices of the ARRAY_REFs and the operands of INDIRECT_REFs. | |
65 | For ARRAY_REFs, BASE_OBJECT is the reference with zeroed indices | |
66 | (note that this reference does not have to be valid, if zero does not | |
67 | belong to the range of the array; hence it is not recommended to use | |
68 | BASE_OBJECT in any code generation). For INDIRECT_REFs, the address is | |
69 | set to the loop-invariant part of the address of the object, except for | |
70 | the constant offset. For the examples above, | |
71 | ||
72 | base_object: a[0].b[0][0] *(p + x + 4B * j_0) | |
73 | indices: {j_0, +, 1}_2 {16, +, 4}_2 | |
74 | {i_0, +, 1}_1 | |
75 | {j_0, +, 1}_2 | |
76 | */ | |
77 | ||
78 | struct indices | |
516849c7 | 79 | { |
80 | /* The object. */ | |
81 | tree base_object; | |
82 | ||
80bb306a | 83 | /* A list of chrecs. Access functions of the indices. */ |
516849c7 | 84 | VEC(tree,heap) *access_fns; |
85 | }; | |
86 | ||
80bb306a | 87 | struct dr_alias |
88 | { | |
89 | /* The alias information that should be used for new pointers to this | |
90 | location. SYMBOL_TAG is either a DECL or a SYMBOL_MEMORY_TAG. */ | |
80bb306a | 91 | struct ptr_info_def *ptr_info; |
92 | ||
93 | /* The set of virtual operands corresponding to this memory reference, | |
94 | serving as a description of the alias information for the memory | |
95 | reference. This could be eliminated if we had alias oracle. */ | |
96 | bitmap vops; | |
516849c7 | 97 | }; |
98 | ||
255b6be7 | 99 | typedef struct scop *scop_p; |
100 | ||
b79b3386 | 101 | /* Each vector of the access matrix represents a linear access |
102 | function for a subscript. First elements correspond to the | |
103 | leftmost indices, ie. for a[i][j] the first vector corresponds to | |
104 | the subscript in "i". The elements of a vector are relative to | |
105 | the loop nests in which the data reference is considered, | |
106 | i.e. the vector is relative to the SCoP that provides the context | |
107 | in which this data reference occurs. | |
108 | ||
109 | For example, in | |
110 | ||
111 | | loop_1 | |
112 | | loop_2 | |
113 | | a[i+3][2*j+n-1] | |
114 | ||
115 | if "i" varies in loop_1 and "j" varies in loop_2, the access | |
116 | matrix with respect to the loop nest {loop_1, loop_2} is: | |
117 | ||
118 | | loop_1 loop_2 param_n cst | |
119 | | 1 0 0 3 | |
120 | | 0 2 1 -1 | |
121 | ||
122 | whereas the access matrix with respect to loop_2 considers "i" as | |
123 | a parameter: | |
124 | ||
125 | | loop_2 param_i param_n cst | |
126 | | 0 1 0 3 | |
127 | | 2 0 1 -1 | |
128 | */ | |
129 | struct access_matrix | |
130 | { | |
2e54c85d | 131 | VEC (loop_p, heap) *loop_nest; |
b79b3386 | 132 | int nb_induction_vars; |
133 | VEC (tree, heap) *parameters; | |
12c697cd | 134 | VEC (lambda_vector, gc) *matrix; |
b79b3386 | 135 | }; |
136 | ||
2e54c85d | 137 | #define AM_LOOP_NEST(M) (M)->loop_nest |
b79b3386 | 138 | #define AM_NB_INDUCTION_VARS(M) (M)->nb_induction_vars |
139 | #define AM_PARAMETERS(M) (M)->parameters | |
140 | #define AM_MATRIX(M) (M)->matrix | |
141 | #define AM_NB_PARAMETERS(M) (VEC_length (tree, AM_PARAMETERS(M))) | |
142 | #define AM_CONST_COLUMN_INDEX(M) (AM_NB_INDUCTION_VARS (M) + AM_NB_PARAMETERS (M)) | |
143 | #define AM_NB_COLUMNS(M) (AM_NB_INDUCTION_VARS (M) + AM_NB_PARAMETERS (M) + 1) | |
144 | #define AM_GET_SUBSCRIPT_ACCESS_VECTOR(M, I) VEC_index (lambda_vector, AM_MATRIX (M), I) | |
145 | #define AM_GET_ACCESS_MATRIX_ELEMENT(M, I, J) AM_GET_SUBSCRIPT_ACCESS_VECTOR (M, I)[J] | |
146 | ||
147 | /* Return the column in the access matrix of LOOP_NUM. */ | |
148 | ||
149 | static inline int | |
150 | am_vector_index_for_loop (struct access_matrix *access_matrix, int loop_num) | |
151 | { | |
2e54c85d | 152 | int i; |
153 | loop_p l; | |
154 | ||
155 | for (i = 0; VEC_iterate (loop_p, AM_LOOP_NEST (access_matrix), i, l); i++) | |
156 | if (l->num == loop_num) | |
157 | return i; | |
158 | ||
159 | gcc_unreachable(); | |
b79b3386 | 160 | } |
161 | ||
162 | int access_matrix_get_index_for_parameter (tree, struct access_matrix *); | |
163 | ||
6b6f234c | 164 | struct data_reference |
2146e26d | 165 | { |
2146e26d | 166 | /* A pointer to the statement that contains this DR. */ |
75a70cf9 | 167 | gimple stmt; |
2146e26d | 168 | |
80bb306a | 169 | /* A pointer to the memory reference. */ |
2146e26d | 170 | tree ref; |
171 | ||
2146e26d | 172 | /* Auxiliary info specific to a pass. */ |
5c205353 | 173 | void *aux; |
2146e26d | 174 | |
175 | /* True when the data reference is in RHS of a stmt. */ | |
176 | bool is_read; | |
177 | ||
80bb306a | 178 | /* Behavior of the memory reference in the innermost loop. */ |
179 | struct innermost_loop_behavior innermost; | |
516849c7 | 180 | |
255b6be7 | 181 | /* Subscripts of this data reference. */ |
80bb306a | 182 | struct indices indices; |
516849c7 | 183 | |
80bb306a | 184 | /* Alias information for the data reference. */ |
185 | struct dr_alias alias; | |
2146e26d | 186 | |
255b6be7 | 187 | /* The SCoP in which the data reference was analyzed. */ |
188 | scop_p scop; | |
189 | ||
b79b3386 | 190 | /* Matrix representation for the data access functions. */ |
191 | struct access_matrix *access_matrix; | |
192 | }; | |
41c7a324 | 193 | |
255b6be7 | 194 | #define DR_SCOP(DR) (DR)->scop |
516849c7 | 195 | #define DR_STMT(DR) (DR)->stmt |
196 | #define DR_REF(DR) (DR)->ref | |
80bb306a | 197 | #define DR_BASE_OBJECT(DR) (DR)->indices.base_object |
198 | #define DR_ACCESS_FNS(DR) (DR)->indices.access_fns | |
516849c7 | 199 | #define DR_ACCESS_FN(DR, I) VEC_index (tree, DR_ACCESS_FNS (DR), I) |
200 | #define DR_NUM_DIMENSIONS(DR) VEC_length (tree, DR_ACCESS_FNS (DR)) | |
201 | #define DR_IS_READ(DR) (DR)->is_read | |
80bb306a | 202 | #define DR_BASE_ADDRESS(DR) (DR)->innermost.base_address |
203 | #define DR_OFFSET(DR) (DR)->innermost.offset | |
204 | #define DR_INIT(DR) (DR)->innermost.init | |
205 | #define DR_STEP(DR) (DR)->innermost.step | |
80bb306a | 206 | #define DR_PTR_INFO(DR) (DR)->alias.ptr_info |
80bb306a | 207 | #define DR_ALIGNED_TO(DR) (DR)->innermost.aligned_to |
b79b3386 | 208 | #define DR_ACCESS_MATRIX(DR) (DR)->access_matrix |
209 | ||
210 | typedef struct data_reference *data_reference_p; | |
211 | DEF_VEC_P(data_reference_p); | |
212 | DEF_VEC_ALLOC_P (data_reference_p, heap); | |
2146e26d | 213 | |
214 | enum data_dependence_direction { | |
215 | dir_positive, | |
216 | dir_negative, | |
217 | dir_equal, | |
218 | dir_positive_or_negative, | |
219 | dir_positive_or_equal, | |
220 | dir_negative_or_equal, | |
221 | dir_star, | |
222 | dir_independent | |
223 | }; | |
224 | ||
87da4f2e | 225 | /* The description of the grid of iterations that overlap. At most |
226 | two loops are considered at the same time just now, hence at most | |
227 | two functions are needed. For each of the functions, we store | |
228 | the vector of coefficients, f[0] + x * f[1] + y * f[2] + ..., | |
229 | where x, y, ... are variables. */ | |
230 | ||
231 | #define MAX_DIM 2 | |
232 | ||
233 | /* Special values of N. */ | |
234 | #define NO_DEPENDENCE 0 | |
235 | #define NOT_KNOWN (MAX_DIM + 1) | |
236 | #define CF_NONTRIVIAL_P(CF) ((CF)->n != NO_DEPENDENCE && (CF)->n != NOT_KNOWN) | |
237 | #define CF_NOT_KNOWN_P(CF) ((CF)->n == NOT_KNOWN) | |
238 | #define CF_NO_DEPENDENCE_P(CF) ((CF)->n == NO_DEPENDENCE) | |
239 | ||
240 | typedef VEC (tree, heap) *affine_fn; | |
241 | ||
242 | typedef struct | |
243 | { | |
244 | unsigned n; | |
245 | affine_fn fns[MAX_DIM]; | |
246 | } conflict_function; | |
247 | ||
2146e26d | 248 | /* What is a subscript? Given two array accesses a subscript is the |
249 | tuple composed of the access functions for a given dimension. | |
250 | Example: Given A[f1][f2][f3] and B[g1][g2][g3], there are three | |
251 | subscripts: (f1, g1), (f2, g2), (f3, g3). These three subscripts | |
252 | are stored in the data_dependence_relation structure under the form | |
253 | of an array of subscripts. */ | |
254 | ||
6b6f234c | 255 | struct subscript |
2146e26d | 256 | { |
257 | /* A description of the iterations for which the elements are | |
258 | accessed twice. */ | |
87da4f2e | 259 | conflict_function *conflicting_iterations_in_a; |
260 | conflict_function *conflicting_iterations_in_b; | |
2146e26d | 261 | |
bc3c8ad4 | 262 | /* This field stores the information about the iteration domain |
2146e26d | 263 | validity of the dependence relation. */ |
bc3c8ad4 | 264 | tree last_conflict; |
2146e26d | 265 | |
266 | /* Distance from the iteration that access a conflicting element in | |
267 | A to the iteration that access this same conflicting element in | |
5c9dae64 | 268 | B. The distance is a tree scalar expression, i.e. a constant or a |
2146e26d | 269 | symbolic expression, but certainly not a chrec function. */ |
270 | tree distance; | |
2146e26d | 271 | }; |
272 | ||
41c7a324 | 273 | typedef struct subscript *subscript_p; |
274 | DEF_VEC_P(subscript_p); | |
275 | DEF_VEC_ALLOC_P (subscript_p, heap); | |
276 | ||
2146e26d | 277 | #define SUB_CONFLICTS_IN_A(SUB) SUB->conflicting_iterations_in_a |
278 | #define SUB_CONFLICTS_IN_B(SUB) SUB->conflicting_iterations_in_b | |
bc3c8ad4 | 279 | #define SUB_LAST_CONFLICT(SUB) SUB->last_conflict |
2146e26d | 280 | #define SUB_DISTANCE(SUB) SUB->distance |
2146e26d | 281 | |
282 | /* A data_dependence_relation represents a relation between two | |
283 | data_references A and B. */ | |
284 | ||
6b6f234c | 285 | struct data_dependence_relation |
2146e26d | 286 | { |
287 | ||
288 | struct data_reference *a; | |
289 | struct data_reference *b; | |
290 | ||
291 | /* A "yes/no/maybe" field for the dependence relation: | |
292 | ||
293 | - when "ARE_DEPENDENT == NULL_TREE", there exist a dependence | |
294 | relation between A and B, and the description of this relation | |
295 | is given in the SUBSCRIPTS array, | |
296 | ||
297 | - when "ARE_DEPENDENT == chrec_known", there is no dependence and | |
298 | SUBSCRIPTS is empty, | |
299 | ||
300 | - when "ARE_DEPENDENT == chrec_dont_know", there may be a dependence, | |
301 | but the analyzer cannot be more specific. */ | |
302 | tree are_dependent; | |
303 | ||
304 | /* For each subscript in the dependence test, there is an element in | |
305 | this array. This is the attribute that labels the edge A->B of | |
306 | the data_dependence_relation. */ | |
41c7a324 | 307 | VEC (subscript_p, heap) *subscripts; |
6b6f234c | 308 | |
b44d1046 | 309 | /* The analyzed loop nest. */ |
310 | VEC (loop_p, heap) *loop_nest; | |
bc3c8ad4 | 311 | |
6b6f234c | 312 | /* The classic direction vector. */ |
41c7a324 | 313 | VEC (lambda_vector, heap) *dir_vects; |
6b6f234c | 314 | |
315 | /* The classic distance vector. */ | |
41c7a324 | 316 | VEC (lambda_vector, heap) *dist_vects; |
0ecb94cf | 317 | |
0ac758f7 | 318 | /* An index in loop_nest for the innermost loop that varies for |
319 | this data dependence relation. */ | |
320 | unsigned inner_loop; | |
321 | ||
0ecb94cf | 322 | /* Is the dependence reversed with respect to the lexicographic order? */ |
323 | bool reversed_p; | |
0ac758f7 | 324 | |
325 | /* When the dependence relation is affine, it can be represented by | |
326 | a distance vector. */ | |
327 | bool affine_p; | |
328 | ||
329 | /* Set to true when the dependence relation is on the same data | |
330 | access. */ | |
331 | bool self_reference_p; | |
2146e26d | 332 | }; |
333 | ||
6b421feb | 334 | typedef struct data_dependence_relation *ddr_p; |
335 | DEF_VEC_P(ddr_p); | |
336 | DEF_VEC_ALLOC_P(ddr_p,heap); | |
337 | ||
2146e26d | 338 | #define DDR_A(DDR) DDR->a |
339 | #define DDR_B(DDR) DDR->b | |
bc3c8ad4 | 340 | #define DDR_AFFINE_P(DDR) DDR->affine_p |
2146e26d | 341 | #define DDR_ARE_DEPENDENT(DDR) DDR->are_dependent |
342 | #define DDR_SUBSCRIPTS(DDR) DDR->subscripts | |
41c7a324 | 343 | #define DDR_SUBSCRIPT(DDR, I) VEC_index (subscript_p, DDR_SUBSCRIPTS (DDR), I) |
344 | #define DDR_NUM_SUBSCRIPTS(DDR) VEC_length (subscript_p, DDR_SUBSCRIPTS (DDR)) | |
b44d1046 | 345 | |
346 | #define DDR_LOOP_NEST(DDR) DDR->loop_nest | |
347 | /* The size of the direction/distance vectors: the number of loops in | |
348 | the loop nest. */ | |
349 | #define DDR_NB_LOOPS(DDR) (VEC_length (loop_p, DDR_LOOP_NEST (DDR))) | |
355572cc | 350 | #define DDR_INNER_LOOP(DDR) DDR->inner_loop |
c127dd86 | 351 | #define DDR_SELF_REFERENCE(DDR) DDR->self_reference_p |
1532ec98 | 352 | |
353 | #define DDR_DIST_VECTS(DDR) ((DDR)->dist_vects) | |
354 | #define DDR_DIR_VECTS(DDR) ((DDR)->dir_vects) | |
355 | #define DDR_NUM_DIST_VECTS(DDR) \ | |
356 | (VEC_length (lambda_vector, DDR_DIST_VECTS (DDR))) | |
357 | #define DDR_NUM_DIR_VECTS(DDR) \ | |
358 | (VEC_length (lambda_vector, DDR_DIR_VECTS (DDR))) | |
359 | #define DDR_DIR_VECT(DDR, I) \ | |
360 | VEC_index (lambda_vector, DDR_DIR_VECTS (DDR), I) | |
361 | #define DDR_DIST_VECT(DDR, I) \ | |
362 | VEC_index (lambda_vector, DDR_DIST_VECTS (DDR), I) | |
0ecb94cf | 363 | #define DDR_REVERSED_P(DDR) DDR->reversed_p |
2146e26d | 364 | |
365 | \f | |
366 | ||
faa56cf9 | 367 | /* Describes a location of a memory reference. */ |
368 | ||
369 | typedef struct data_ref_loc_d | |
370 | { | |
371 | /* Position of the memory reference. */ | |
372 | tree *pos; | |
373 | ||
374 | /* True if the memory reference is read. */ | |
375 | bool is_read; | |
376 | } data_ref_loc; | |
377 | ||
378 | DEF_VEC_O (data_ref_loc); | |
379 | DEF_VEC_ALLOC_O (data_ref_loc, heap); | |
380 | ||
75a70cf9 | 381 | bool get_references_in_stmt (gimple, VEC (data_ref_loc, heap) **); |
880734c8 | 382 | bool dr_analyze_innermost (struct data_reference *); |
b79b3386 | 383 | extern bool compute_data_dependences_for_loop (struct loop *, bool, |
04bd1b81 | 384 | VEC (data_reference_p, heap) **, |
385 | VEC (ddr_p, heap) **); | |
255b6be7 | 386 | extern tree find_data_references_in_loop (struct loop *, |
387 | VEC (data_reference_p, heap) **); | |
6b421feb | 388 | extern void print_direction_vector (FILE *, lambda_vector, int); |
b44d1046 | 389 | extern void print_dir_vectors (FILE *, VEC (lambda_vector, heap) *, int); |
390 | extern void print_dist_vectors (FILE *, VEC (lambda_vector, heap) *, int); | |
bc3c8ad4 | 391 | extern void dump_subscript (FILE *, struct subscript *); |
41c7a324 | 392 | extern void dump_ddrs (FILE *, VEC (ddr_p, heap) *); |
393 | extern void dump_dist_dir_vectors (FILE *, VEC (ddr_p, heap) *); | |
2146e26d | 394 | extern void dump_data_reference (FILE *, struct data_reference *); |
41c7a324 | 395 | extern void dump_data_references (FILE *, VEC (data_reference_p, heap) *); |
b44d1046 | 396 | extern void debug_data_dependence_relation (struct data_dependence_relation *); |
2146e26d | 397 | extern void dump_data_dependence_relation (FILE *, |
398 | struct data_dependence_relation *); | |
41c7a324 | 399 | extern void dump_data_dependence_relations (FILE *, VEC (ddr_p, heap) *); |
801c5610 | 400 | extern void debug_data_dependence_relations (VEC (ddr_p, heap) *); |
2146e26d | 401 | extern void dump_data_dependence_direction (FILE *, |
402 | enum data_dependence_direction); | |
6b6f234c | 403 | extern void free_dependence_relation (struct data_dependence_relation *); |
41c7a324 | 404 | extern void free_dependence_relations (VEC (ddr_p, heap) *); |
801c5610 | 405 | extern void free_data_ref (data_reference_p); |
41c7a324 | 406 | extern void free_data_refs (VEC (data_reference_p, heap) *); |
255b6be7 | 407 | extern bool find_data_references_in_stmt (struct loop *, gimple, |
408 | VEC (data_reference_p, heap) **); | |
75a70cf9 | 409 | struct data_reference *create_data_ref (struct loop *, tree, gimple, bool); |
255b6be7 | 410 | extern bool find_loop_nest (struct loop *, VEC (loop_p, heap) **); |
411 | extern void compute_all_dependences (VEC (data_reference_p, heap) *, | |
412 | VEC (ddr_p, heap) **, VEC (loop_p, heap) *, | |
413 | bool); | |
414 | ||
415 | extern void create_rdg_vertices (struct graph *, VEC (gimple, heap) *); | |
416 | extern bool dr_may_alias_p (const struct data_reference *, | |
417 | const struct data_reference *); | |
418 | extern bool stmt_simple_memref_p (struct loop *, gimple, tree); | |
41c7a324 | 419 | |
801c5610 | 420 | /* Return true when the DDR contains two data references that have the |
421 | same access functions. */ | |
422 | ||
423 | static inline bool | |
424 | same_access_functions (const struct data_dependence_relation *ddr) | |
425 | { | |
426 | unsigned i; | |
427 | ||
428 | for (i = 0; i < DDR_NUM_SUBSCRIPTS (ddr); i++) | |
429 | if (!eq_evolutions_p (DR_ACCESS_FN (DDR_A (ddr), i), | |
430 | DR_ACCESS_FN (DDR_B (ddr), i))) | |
431 | return false; | |
432 | ||
433 | return true; | |
434 | } | |
435 | ||
436 | /* Return true when DDR is an anti-dependence relation. */ | |
437 | ||
438 | static inline bool | |
439 | ddr_is_anti_dependent (ddr_p ddr) | |
440 | { | |
441 | return (DDR_ARE_DEPENDENT (ddr) == NULL_TREE | |
442 | && DR_IS_READ (DDR_A (ddr)) | |
443 | && !DR_IS_READ (DDR_B (ddr)) | |
444 | && !same_access_functions (ddr)); | |
445 | } | |
446 | ||
447 | /* Return true when DEPENDENCE_RELATIONS contains an anti-dependence. */ | |
448 | ||
449 | static inline bool | |
450 | ddrs_have_anti_deps (VEC (ddr_p, heap) *dependence_relations) | |
451 | { | |
452 | unsigned i; | |
453 | ddr_p ddr; | |
454 | ||
455 | for (i = 0; VEC_iterate (ddr_p, dependence_relations, i, ddr); i++) | |
456 | if (ddr_is_anti_dependent (ddr)) | |
457 | return true; | |
458 | ||
459 | return false; | |
460 | } | |
461 | ||
462 | /* Return the dependence level for the DDR relation. */ | |
463 | ||
464 | static inline unsigned | |
465 | ddr_dependence_level (ddr_p ddr) | |
466 | { | |
467 | unsigned vector; | |
468 | unsigned level = 0; | |
469 | ||
470 | if (DDR_DIST_VECTS (ddr)) | |
471 | level = dependence_level (DDR_DIST_VECT (ddr, 0), DDR_NB_LOOPS (ddr)); | |
472 | ||
473 | for (vector = 1; vector < DDR_NUM_DIST_VECTS (ddr); vector++) | |
474 | level = MIN (level, dependence_level (DDR_DIST_VECT (ddr, vector), | |
475 | DDR_NB_LOOPS (ddr))); | |
476 | return level; | |
477 | } | |
478 | ||
74c8f69a | 479 | \f |
480 | ||
801c5610 | 481 | /* A Reduced Dependence Graph (RDG) vertex representing a statement. */ |
74c8f69a | 482 | typedef struct rdg_vertex |
483 | { | |
484 | /* The statement represented by this vertex. */ | |
75a70cf9 | 485 | gimple stmt; |
801c5610 | 486 | |
487 | /* True when the statement contains a write to memory. */ | |
488 | bool has_mem_write; | |
489 | ||
490 | /* True when the statement contains a read from memory. */ | |
491 | bool has_mem_reads; | |
74c8f69a | 492 | } *rdg_vertex_p; |
493 | ||
801c5610 | 494 | #define RDGV_STMT(V) ((struct rdg_vertex *) ((V)->data))->stmt |
495 | #define RDGV_HAS_MEM_WRITE(V) ((struct rdg_vertex *) ((V)->data))->has_mem_write | |
496 | #define RDGV_HAS_MEM_READS(V) ((struct rdg_vertex *) ((V)->data))->has_mem_reads | |
497 | #define RDG_STMT(RDG, I) RDGV_STMT (&(RDG->vertices[I])) | |
498 | #define RDG_MEM_WRITE_STMT(RDG, I) RDGV_HAS_MEM_WRITE (&(RDG->vertices[I])) | |
499 | #define RDG_MEM_READS_STMT(RDG, I) RDGV_HAS_MEM_READS (&(RDG->vertices[I])) | |
500 | ||
501 | void dump_rdg_vertex (FILE *, struct graph *, int); | |
502 | void debug_rdg_vertex (struct graph *, int); | |
503 | void dump_rdg_component (FILE *, struct graph *, int, bitmap); | |
504 | void debug_rdg_component (struct graph *, int); | |
505 | void dump_rdg (FILE *, struct graph *); | |
506 | void debug_rdg (struct graph *); | |
507 | void dot_rdg (struct graph *); | |
75a70cf9 | 508 | int rdg_vertex_for_stmt (struct graph *, gimple); |
74c8f69a | 509 | |
510 | /* Data dependence type. */ | |
511 | ||
512 | enum rdg_dep_type | |
513 | { | |
514 | /* Read After Write (RAW). */ | |
515 | flow_dd = 'f', | |
516 | ||
517 | /* Write After Read (WAR). */ | |
518 | anti_dd = 'a', | |
519 | ||
520 | /* Write After Write (WAW). */ | |
521 | output_dd = 'o', | |
522 | ||
523 | /* Read After Read (RAR). */ | |
524 | input_dd = 'i' | |
525 | }; | |
526 | ||
527 | /* Dependence information attached to an edge of the RDG. */ | |
528 | ||
529 | typedef struct rdg_edge | |
530 | { | |
531 | /* Type of the dependence. */ | |
532 | enum rdg_dep_type type; | |
801c5610 | 533 | |
255b6be7 | 534 | /* Levels of the dependence: the depth of the loops that carry the |
535 | dependence. */ | |
801c5610 | 536 | unsigned level; |
255b6be7 | 537 | |
538 | /* Dependence relation between data dependences, NULL when one of | |
539 | the vertices is a scalar. */ | |
540 | ddr_p relation; | |
74c8f69a | 541 | } *rdg_edge_p; |
542 | ||
543 | #define RDGE_TYPE(E) ((struct rdg_edge *) ((E)->data))->type | |
801c5610 | 544 | #define RDGE_LEVEL(E) ((struct rdg_edge *) ((E)->data))->level |
255b6be7 | 545 | #define RDGE_RELATION(E) ((struct rdg_edge *) ((E)->data))->relation |
74c8f69a | 546 | |
547 | struct graph *build_rdg (struct loop *); | |
255b6be7 | 548 | struct graph *build_empty_rdg (int); |
801c5610 | 549 | void free_rdg (struct graph *); |
74c8f69a | 550 | |
b44d1046 | 551 | /* Return the index of the variable VAR in the LOOP_NEST array. */ |
552 | ||
553 | static inline int | |
554 | index_in_loop_nest (int var, VEC (loop_p, heap) *loop_nest) | |
555 | { | |
556 | struct loop *loopi; | |
557 | int var_index; | |
558 | ||
559 | for (var_index = 0; VEC_iterate (loop_p, loop_nest, var_index, loopi); | |
560 | var_index++) | |
561 | if (loopi->num == var) | |
562 | break; | |
563 | ||
564 | return var_index; | |
565 | } | |
566 | ||
75a70cf9 | 567 | void stores_from_loop (struct loop *, VEC (gimple, heap) **); |
568 | void remove_similar_memory_refs (VEC (gimple, heap) **); | |
801c5610 | 569 | bool rdg_defs_used_in_other_loops_p (struct graph *, int); |
75a70cf9 | 570 | bool have_similar_memory_accesses (gimple, gimple); |
801c5610 | 571 | |
572 | /* Determines whether RDG vertices V1 and V2 access to similar memory | |
573 | locations, in which case they have to be in the same partition. */ | |
574 | ||
575 | static inline bool | |
576 | rdg_has_similar_memory_accesses (struct graph *rdg, int v1, int v2) | |
577 | { | |
578 | return have_similar_memory_accesses (RDG_STMT (rdg, v1), | |
579 | RDG_STMT (rdg, v2)); | |
580 | } | |
581 | ||
41c7a324 | 582 | /* In lambda-code.c */ |
b79b3386 | 583 | bool lambda_transform_legal_p (lambda_trans_matrix, int, |
584 | VEC (ddr_p, heap) *); | |
585 | void lambda_collect_parameters (VEC (data_reference_p, heap) *, | |
586 | VEC (tree, heap) **); | |
587 | bool lambda_compute_access_matrices (VEC (data_reference_p, heap) *, | |
2e54c85d | 588 | VEC (tree, heap) *, VEC (loop_p, heap) *); |
2146e26d | 589 | |
255b6be7 | 590 | /* In tree-data-ref.c */ |
b0eb8c66 | 591 | void split_constant_offset (tree , tree *, tree *); |
592 | ||
255b6be7 | 593 | /* Strongly connected components of the reduced data dependence graph. */ |
594 | ||
595 | typedef struct rdg_component | |
596 | { | |
597 | int num; | |
598 | VEC (int, heap) *vertices; | |
599 | } *rdgc; | |
600 | ||
601 | DEF_VEC_P (rdgc); | |
602 | DEF_VEC_ALLOC_P (rdgc, heap); | |
603 | ||
604 | DEF_VEC_P (bitmap); | |
605 | DEF_VEC_ALLOC_P (bitmap, heap); | |
606 | ||
2146e26d | 607 | #endif /* GCC_TREE_DATA_REF_H */ |