Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-data-ref.h @ 59:5b5b9ea5b220
fix
| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 15 Feb 2010 17:22:24 +0900 |
| parents | 77e2b8dfacca |
| children | b7f97abdc517 |
| rev | line source |
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1 /* Data references and dependences detectors. |
| 0 | 2 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
| 3 Free Software Foundation, Inc. | |
| 4 Contributed by Sebastian Pop <pop@cri.ensmp.fr> | |
| 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 | |
| 10 Software Foundation; either version 3, or (at your option) any later | |
| 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 | |
| 19 along with GCC; see the file COPYING3. If not see | |
| 20 <http://www.gnu.org/licenses/>. */ | |
| 21 | |
| 22 #ifndef GCC_TREE_DATA_REF_H | |
| 23 #define GCC_TREE_DATA_REF_H | |
| 24 | |
| 25 #include "graphds.h" | |
| 26 #include "lambda.h" | |
| 27 #include "omega.h" | |
| 28 #include "tree-chrec.h" | |
| 29 | |
| 30 /* | |
| 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 | |
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35 constant offset (INIT). Examples, in loop nest |
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36 |
| 0 | 37 for (i = 0; i < 100; i++) |
| 38 for (j = 3; j < 100; j++) | |
| 39 | |
| 40 Example 1 Example 2 | |
| 41 data-ref a[j].b[i][j] *(p + x + 16B + 4B * j) | |
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42 |
| 0 | 43 |
| 44 innermost_loop_behavior | |
| 45 base_address &a p | |
| 46 offset i * D_i x | |
| 47 init 3 * D_j + offsetof (b) 28 | |
| 48 step D_j 4 | |
| 49 | |
| 50 */ | |
| 51 struct innermost_loop_behavior | |
| 52 { | |
| 53 tree base_address; | |
| 54 tree offset; | |
| 55 tree init; | |
| 56 tree step; | |
| 57 | |
| 58 /* Alignment information. ALIGNED_TO is set to the largest power of two | |
| 59 that divides OFFSET. */ | |
| 60 tree aligned_to; | |
| 61 }; | |
| 62 | |
| 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 | |
| 79 { | |
| 80 /* The object. */ | |
| 81 tree base_object; | |
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82 |
| 0 | 83 /* A list of chrecs. Access functions of the indices. */ |
| 84 VEC(tree,heap) *access_fns; | |
| 85 }; | |
| 86 | |
| 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. */ | |
| 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; | |
| 97 }; | |
| 98 | |
| 99 /* Each vector of the access matrix represents a linear access | |
| 100 function for a subscript. First elements correspond to the | |
| 101 leftmost indices, ie. for a[i][j] the first vector corresponds to | |
| 102 the subscript in "i". The elements of a vector are relative to | |
| 103 the loop nests in which the data reference is considered, | |
| 104 i.e. the vector is relative to the SCoP that provides the context | |
| 105 in which this data reference occurs. | |
| 106 | |
| 107 For example, in | |
| 108 | |
| 109 | loop_1 | |
| 110 | loop_2 | |
| 111 | a[i+3][2*j+n-1] | |
| 112 | |
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113 if "i" varies in loop_1 and "j" varies in loop_2, the access |
| 0 | 114 matrix with respect to the loop nest {loop_1, loop_2} is: |
| 115 | |
| 116 | loop_1 loop_2 param_n cst | |
| 117 | 1 0 0 3 | |
| 118 | 0 2 1 -1 | |
| 119 | |
| 120 whereas the access matrix with respect to loop_2 considers "i" as | |
| 121 a parameter: | |
| 122 | |
| 123 | loop_2 param_i param_n cst | |
| 124 | 0 1 0 3 | |
| 125 | 2 0 1 -1 | |
| 126 */ | |
| 127 struct access_matrix | |
| 128 { | |
| 129 VEC (loop_p, heap) *loop_nest; | |
| 130 int nb_induction_vars; | |
| 131 VEC (tree, heap) *parameters; | |
| 132 VEC (lambda_vector, gc) *matrix; | |
| 133 }; | |
| 134 | |
| 135 #define AM_LOOP_NEST(M) (M)->loop_nest | |
| 136 #define AM_NB_INDUCTION_VARS(M) (M)->nb_induction_vars | |
| 137 #define AM_PARAMETERS(M) (M)->parameters | |
| 138 #define AM_MATRIX(M) (M)->matrix | |
| 139 #define AM_NB_PARAMETERS(M) (VEC_length (tree, AM_PARAMETERS(M))) | |
| 140 #define AM_CONST_COLUMN_INDEX(M) (AM_NB_INDUCTION_VARS (M) + AM_NB_PARAMETERS (M)) | |
| 141 #define AM_NB_COLUMNS(M) (AM_NB_INDUCTION_VARS (M) + AM_NB_PARAMETERS (M) + 1) | |
| 142 #define AM_GET_SUBSCRIPT_ACCESS_VECTOR(M, I) VEC_index (lambda_vector, AM_MATRIX (M), I) | |
| 143 #define AM_GET_ACCESS_MATRIX_ELEMENT(M, I, J) AM_GET_SUBSCRIPT_ACCESS_VECTOR (M, I)[J] | |
| 144 | |
| 145 /* Return the column in the access matrix of LOOP_NUM. */ | |
| 146 | |
| 147 static inline int | |
| 148 am_vector_index_for_loop (struct access_matrix *access_matrix, int loop_num) | |
| 149 { | |
| 150 int i; | |
| 151 loop_p l; | |
| 152 | |
| 153 for (i = 0; VEC_iterate (loop_p, AM_LOOP_NEST (access_matrix), i, l); i++) | |
| 154 if (l->num == loop_num) | |
| 155 return i; | |
| 156 | |
| 157 gcc_unreachable(); | |
| 158 } | |
| 159 | |
| 160 int access_matrix_get_index_for_parameter (tree, struct access_matrix *); | |
| 161 | |
| 162 struct data_reference | |
| 163 { | |
| 164 /* A pointer to the statement that contains this DR. */ | |
| 165 gimple stmt; | |
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166 |
| 0 | 167 /* A pointer to the memory reference. */ |
| 168 tree ref; | |
| 169 | |
| 170 /* Auxiliary info specific to a pass. */ | |
| 171 void *aux; | |
| 172 | |
| 173 /* True when the data reference is in RHS of a stmt. */ | |
| 174 bool is_read; | |
| 175 | |
| 176 /* Behavior of the memory reference in the innermost loop. */ | |
| 177 struct innermost_loop_behavior innermost; | |
| 178 | |
| 179 /* Subscripts of this data reference. */ | |
| 180 struct indices indices; | |
| 181 | |
| 182 /* Alias information for the data reference. */ | |
| 183 struct dr_alias alias; | |
| 184 | |
| 185 /* Matrix representation for the data access functions. */ | |
| 186 struct access_matrix *access_matrix; | |
| 187 }; | |
| 188 | |
| 189 #define DR_STMT(DR) (DR)->stmt | |
| 190 #define DR_REF(DR) (DR)->ref | |
| 191 #define DR_BASE_OBJECT(DR) (DR)->indices.base_object | |
| 192 #define DR_ACCESS_FNS(DR) (DR)->indices.access_fns | |
| 193 #define DR_ACCESS_FN(DR, I) VEC_index (tree, DR_ACCESS_FNS (DR), I) | |
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194 #define DR_NUM_DIMENSIONS(DR) VEC_length (tree, DR_ACCESS_FNS (DR)) |
| 0 | 195 #define DR_IS_READ(DR) (DR)->is_read |
| 196 #define DR_BASE_ADDRESS(DR) (DR)->innermost.base_address | |
| 197 #define DR_OFFSET(DR) (DR)->innermost.offset | |
| 198 #define DR_INIT(DR) (DR)->innermost.init | |
| 199 #define DR_STEP(DR) (DR)->innermost.step | |
| 200 #define DR_PTR_INFO(DR) (DR)->alias.ptr_info | |
| 201 #define DR_ALIGNED_TO(DR) (DR)->innermost.aligned_to | |
| 202 #define DR_ACCESS_MATRIX(DR) (DR)->access_matrix | |
| 203 | |
| 204 typedef struct data_reference *data_reference_p; | |
| 205 DEF_VEC_P(data_reference_p); | |
| 206 DEF_VEC_ALLOC_P (data_reference_p, heap); | |
| 207 | |
| 208 enum data_dependence_direction { | |
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209 dir_positive, |
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210 dir_negative, |
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211 dir_equal, |
| 0 | 212 dir_positive_or_negative, |
| 213 dir_positive_or_equal, | |
| 214 dir_negative_or_equal, | |
| 215 dir_star, | |
| 216 dir_independent | |
| 217 }; | |
| 218 | |
| 219 /* The description of the grid of iterations that overlap. At most | |
| 220 two loops are considered at the same time just now, hence at most | |
| 221 two functions are needed. For each of the functions, we store | |
| 222 the vector of coefficients, f[0] + x * f[1] + y * f[2] + ..., | |
| 223 where x, y, ... are variables. */ | |
| 224 | |
| 225 #define MAX_DIM 2 | |
| 226 | |
| 227 /* Special values of N. */ | |
| 228 #define NO_DEPENDENCE 0 | |
| 229 #define NOT_KNOWN (MAX_DIM + 1) | |
| 230 #define CF_NONTRIVIAL_P(CF) ((CF)->n != NO_DEPENDENCE && (CF)->n != NOT_KNOWN) | |
| 231 #define CF_NOT_KNOWN_P(CF) ((CF)->n == NOT_KNOWN) | |
| 232 #define CF_NO_DEPENDENCE_P(CF) ((CF)->n == NO_DEPENDENCE) | |
| 233 | |
| 234 typedef VEC (tree, heap) *affine_fn; | |
| 235 | |
| 236 typedef struct | |
| 237 { | |
| 238 unsigned n; | |
| 239 affine_fn fns[MAX_DIM]; | |
| 240 } conflict_function; | |
| 241 | |
| 242 /* What is a subscript? Given two array accesses a subscript is the | |
| 243 tuple composed of the access functions for a given dimension. | |
| 244 Example: Given A[f1][f2][f3] and B[g1][g2][g3], there are three | |
| 245 subscripts: (f1, g1), (f2, g2), (f3, g3). These three subscripts | |
| 246 are stored in the data_dependence_relation structure under the form | |
| 247 of an array of subscripts. */ | |
| 248 | |
| 249 struct subscript | |
| 250 { | |
| 251 /* A description of the iterations for which the elements are | |
| 252 accessed twice. */ | |
| 253 conflict_function *conflicting_iterations_in_a; | |
| 254 conflict_function *conflicting_iterations_in_b; | |
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255 |
| 0 | 256 /* This field stores the information about the iteration domain |
| 257 validity of the dependence relation. */ | |
| 258 tree last_conflict; | |
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259 |
| 0 | 260 /* Distance from the iteration that access a conflicting element in |
| 261 A to the iteration that access this same conflicting element in | |
| 262 B. The distance is a tree scalar expression, i.e. a constant or a | |
| 263 symbolic expression, but certainly not a chrec function. */ | |
| 264 tree distance; | |
| 265 }; | |
| 266 | |
| 267 typedef struct subscript *subscript_p; | |
| 268 DEF_VEC_P(subscript_p); | |
| 269 DEF_VEC_ALLOC_P (subscript_p, heap); | |
| 270 | |
| 271 #define SUB_CONFLICTS_IN_A(SUB) SUB->conflicting_iterations_in_a | |
| 272 #define SUB_CONFLICTS_IN_B(SUB) SUB->conflicting_iterations_in_b | |
| 273 #define SUB_LAST_CONFLICT(SUB) SUB->last_conflict | |
| 274 #define SUB_DISTANCE(SUB) SUB->distance | |
| 275 | |
| 276 /* A data_dependence_relation represents a relation between two | |
| 277 data_references A and B. */ | |
| 278 | |
| 279 struct data_dependence_relation | |
| 280 { | |
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281 |
| 0 | 282 struct data_reference *a; |
| 283 struct data_reference *b; | |
| 284 | |
| 285 /* A "yes/no/maybe" field for the dependence relation: | |
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286 |
| 0 | 287 - when "ARE_DEPENDENT == NULL_TREE", there exist a dependence |
| 288 relation between A and B, and the description of this relation | |
| 289 is given in the SUBSCRIPTS array, | |
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290 |
| 0 | 291 - when "ARE_DEPENDENT == chrec_known", there is no dependence and |
| 292 SUBSCRIPTS is empty, | |
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293 |
| 0 | 294 - when "ARE_DEPENDENT == chrec_dont_know", there may be a dependence, |
| 295 but the analyzer cannot be more specific. */ | |
| 296 tree are_dependent; | |
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297 |
| 0 | 298 /* For each subscript in the dependence test, there is an element in |
| 299 this array. This is the attribute that labels the edge A->B of | |
| 300 the data_dependence_relation. */ | |
| 301 VEC (subscript_p, heap) *subscripts; | |
| 302 | |
| 303 /* The analyzed loop nest. */ | |
| 304 VEC (loop_p, heap) *loop_nest; | |
| 305 | |
| 306 /* The classic direction vector. */ | |
| 307 VEC (lambda_vector, heap) *dir_vects; | |
| 308 | |
| 309 /* The classic distance vector. */ | |
| 310 VEC (lambda_vector, heap) *dist_vects; | |
| 311 | |
| 312 /* An index in loop_nest for the innermost loop that varies for | |
| 313 this data dependence relation. */ | |
| 314 unsigned inner_loop; | |
| 315 | |
| 316 /* Is the dependence reversed with respect to the lexicographic order? */ | |
| 317 bool reversed_p; | |
| 318 | |
| 319 /* When the dependence relation is affine, it can be represented by | |
| 320 a distance vector. */ | |
| 321 bool affine_p; | |
| 322 | |
| 323 /* Set to true when the dependence relation is on the same data | |
| 324 access. */ | |
| 325 bool self_reference_p; | |
| 326 }; | |
| 327 | |
| 328 typedef struct data_dependence_relation *ddr_p; | |
| 329 DEF_VEC_P(ddr_p); | |
| 330 DEF_VEC_ALLOC_P(ddr_p,heap); | |
| 331 | |
| 332 #define DDR_A(DDR) DDR->a | |
| 333 #define DDR_B(DDR) DDR->b | |
| 334 #define DDR_AFFINE_P(DDR) DDR->affine_p | |
| 335 #define DDR_ARE_DEPENDENT(DDR) DDR->are_dependent | |
| 336 #define DDR_SUBSCRIPTS(DDR) DDR->subscripts | |
| 337 #define DDR_SUBSCRIPT(DDR, I) VEC_index (subscript_p, DDR_SUBSCRIPTS (DDR), I) | |
| 338 #define DDR_NUM_SUBSCRIPTS(DDR) VEC_length (subscript_p, DDR_SUBSCRIPTS (DDR)) | |
| 339 | |
| 340 #define DDR_LOOP_NEST(DDR) DDR->loop_nest | |
| 341 /* The size of the direction/distance vectors: the number of loops in | |
| 342 the loop nest. */ | |
| 343 #define DDR_NB_LOOPS(DDR) (VEC_length (loop_p, DDR_LOOP_NEST (DDR))) | |
| 344 #define DDR_INNER_LOOP(DDR) DDR->inner_loop | |
| 345 #define DDR_SELF_REFERENCE(DDR) DDR->self_reference_p | |
| 346 | |
| 347 #define DDR_DIST_VECTS(DDR) ((DDR)->dist_vects) | |
| 348 #define DDR_DIR_VECTS(DDR) ((DDR)->dir_vects) | |
| 349 #define DDR_NUM_DIST_VECTS(DDR) \ | |
| 350 (VEC_length (lambda_vector, DDR_DIST_VECTS (DDR))) | |
| 351 #define DDR_NUM_DIR_VECTS(DDR) \ | |
| 352 (VEC_length (lambda_vector, DDR_DIR_VECTS (DDR))) | |
| 353 #define DDR_DIR_VECT(DDR, I) \ | |
| 354 VEC_index (lambda_vector, DDR_DIR_VECTS (DDR), I) | |
| 355 #define DDR_DIST_VECT(DDR, I) \ | |
| 356 VEC_index (lambda_vector, DDR_DIST_VECTS (DDR), I) | |
| 357 #define DDR_REVERSED_P(DDR) DDR->reversed_p | |
| 358 | |
| 359 | |
| 360 | |
| 361 /* Describes a location of a memory reference. */ | |
| 362 | |
| 363 typedef struct data_ref_loc_d | |
| 364 { | |
| 365 /* Position of the memory reference. */ | |
| 366 tree *pos; | |
| 367 | |
| 368 /* True if the memory reference is read. */ | |
| 369 bool is_read; | |
| 370 } data_ref_loc; | |
| 371 | |
| 372 DEF_VEC_O (data_ref_loc); | |
| 373 DEF_VEC_ALLOC_O (data_ref_loc, heap); | |
| 374 | |
| 375 bool get_references_in_stmt (gimple, VEC (data_ref_loc, heap) **); | |
| 376 bool dr_analyze_innermost (struct data_reference *); | |
| 377 extern bool compute_data_dependences_for_loop (struct loop *, bool, | |
| 378 VEC (data_reference_p, heap) **, | |
| 379 VEC (ddr_p, heap) **); | |
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380 extern bool compute_data_dependences_for_bb (basic_block, bool, |
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381 VEC (data_reference_p, heap) **, |
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382 VEC (ddr_p, heap) **); |
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383 extern tree find_data_references_in_loop (struct loop *, |
| 0 | 384 VEC (data_reference_p, heap) **); |
| 385 extern void print_direction_vector (FILE *, lambda_vector, int); | |
| 386 extern void print_dir_vectors (FILE *, VEC (lambda_vector, heap) *, int); | |
| 387 extern void print_dist_vectors (FILE *, VEC (lambda_vector, heap) *, int); | |
| 388 extern void dump_subscript (FILE *, struct subscript *); | |
| 389 extern void dump_ddrs (FILE *, VEC (ddr_p, heap) *); | |
| 390 extern void dump_dist_dir_vectors (FILE *, VEC (ddr_p, heap) *); | |
| 391 extern void dump_data_reference (FILE *, struct data_reference *); | |
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392 extern void debug_data_reference (struct data_reference *); |
| 0 | 393 extern void dump_data_references (FILE *, VEC (data_reference_p, heap) *); |
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394 extern void debug_data_references (VEC (data_reference_p, heap) *); |
| 0 | 395 extern void debug_data_dependence_relation (struct data_dependence_relation *); |
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396 extern void dump_data_dependence_relation (FILE *, |
| 0 | 397 struct data_dependence_relation *); |
| 398 extern void dump_data_dependence_relations (FILE *, VEC (ddr_p, heap) *); | |
| 399 extern void debug_data_dependence_relations (VEC (ddr_p, heap) *); | |
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400 extern void dump_data_dependence_direction (FILE *, |
| 0 | 401 enum data_dependence_direction); |
| 402 extern void free_dependence_relation (struct data_dependence_relation *); | |
| 403 extern void free_dependence_relations (VEC (ddr_p, heap) *); | |
| 404 extern void free_data_ref (data_reference_p); | |
| 405 extern void free_data_refs (VEC (data_reference_p, heap) *); | |
| 406 extern bool find_data_references_in_stmt (struct loop *, gimple, | |
| 407 VEC (data_reference_p, heap) **); | |
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408 extern bool graphite_find_data_references_in_stmt (struct loop *, gimple, |
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409 VEC (data_reference_p, heap) **); |
| 0 | 410 struct data_reference *create_data_ref (struct loop *, tree, gimple, bool); |
| 411 extern bool find_loop_nest (struct loop *, VEC (loop_p, heap) **); | |
| 412 extern void compute_all_dependences (VEC (data_reference_p, heap) *, | |
| 413 VEC (ddr_p, heap) **, VEC (loop_p, heap) *, | |
| 414 bool); | |
| 415 | |
| 416 extern void create_rdg_vertices (struct graph *, VEC (gimple, heap) *); | |
| 417 extern bool dr_may_alias_p (const struct data_reference *, | |
| 418 const struct data_reference *); | |
| 419 | |
| 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 | |
| 479 | |
| 480 | |
| 481 /* A Reduced Dependence Graph (RDG) vertex representing a statement. */ | |
| 482 typedef struct rdg_vertex | |
| 483 { | |
| 484 /* The statement represented by this vertex. */ | |
| 485 gimple stmt; | |
| 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; | |
| 492 } *rdg_vertex_p; | |
| 493 | |
| 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 int rdg_vertex_for_stmt (struct graph *, gimple); | |
| 508 | |
| 509 /* Data dependence type. */ | |
| 510 | |
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511 enum rdg_dep_type |
| 0 | 512 { |
| 513 /* Read After Write (RAW). */ | |
| 514 flow_dd = 'f', | |
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515 |
| 0 | 516 /* Write After Read (WAR). */ |
| 517 anti_dd = 'a', | |
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518 |
| 0 | 519 /* Write After Write (WAW). */ |
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520 output_dd = 'o', |
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521 |
| 0 | 522 /* Read After Read (RAR). */ |
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523 input_dd = 'i' |
| 0 | 524 }; |
| 525 | |
| 526 /* Dependence information attached to an edge of the RDG. */ | |
| 527 | |
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528 typedef struct rdg_edge |
| 0 | 529 { |
| 530 /* Type of the dependence. */ | |
| 531 enum rdg_dep_type type; | |
| 532 | |
| 533 /* Levels of the dependence: the depth of the loops that carry the | |
| 534 dependence. */ | |
| 535 unsigned level; | |
| 536 | |
| 537 /* Dependence relation between data dependences, NULL when one of | |
| 538 the vertices is a scalar. */ | |
| 539 ddr_p relation; | |
| 540 } *rdg_edge_p; | |
| 541 | |
| 542 #define RDGE_TYPE(E) ((struct rdg_edge *) ((E)->data))->type | |
| 543 #define RDGE_LEVEL(E) ((struct rdg_edge *) ((E)->data))->level | |
| 544 #define RDGE_RELATION(E) ((struct rdg_edge *) ((E)->data))->relation | |
| 545 | |
| 546 struct graph *build_rdg (struct loop *); | |
| 547 struct graph *build_empty_rdg (int); | |
| 548 void free_rdg (struct graph *); | |
| 549 | |
| 550 /* Return the index of the variable VAR in the LOOP_NEST array. */ | |
| 551 | |
| 552 static inline int | |
| 553 index_in_loop_nest (int var, VEC (loop_p, heap) *loop_nest) | |
| 554 { | |
| 555 struct loop *loopi; | |
| 556 int var_index; | |
| 557 | |
| 558 for (var_index = 0; VEC_iterate (loop_p, loop_nest, var_index, loopi); | |
| 559 var_index++) | |
| 560 if (loopi->num == var) | |
| 561 break; | |
| 562 | |
| 563 return var_index; | |
| 564 } | |
| 565 | |
| 566 void stores_from_loop (struct loop *, VEC (gimple, heap) **); | |
| 567 void remove_similar_memory_refs (VEC (gimple, heap) **); | |
| 568 bool rdg_defs_used_in_other_loops_p (struct graph *, int); | |
| 569 bool have_similar_memory_accesses (gimple, gimple); | |
| 570 | |
| 571 /* Determines whether RDG vertices V1 and V2 access to similar memory | |
| 572 locations, in which case they have to be in the same partition. */ | |
| 573 | |
| 574 static inline bool | |
| 575 rdg_has_similar_memory_accesses (struct graph *rdg, int v1, int v2) | |
| 576 { | |
| 577 return have_similar_memory_accesses (RDG_STMT (rdg, v1), | |
| 578 RDG_STMT (rdg, v2)); | |
| 579 } | |
| 580 | |
| 581 /* In lambda-code.c */ | |
| 582 bool lambda_transform_legal_p (lambda_trans_matrix, int, | |
| 583 VEC (ddr_p, heap) *); | |
| 584 void lambda_collect_parameters (VEC (data_reference_p, heap) *, | |
| 585 VEC (tree, heap) **); | |
| 586 bool lambda_compute_access_matrices (VEC (data_reference_p, heap) *, | |
| 587 VEC (tree, heap) *, VEC (loop_p, heap) *); | |
| 588 | |
| 589 /* In tree-data-ref.c */ | |
| 590 void split_constant_offset (tree , tree *, tree *); | |
| 591 | |
| 592 /* Strongly connected components of the reduced data dependence graph. */ | |
| 593 | |
| 594 typedef struct rdg_component | |
| 595 { | |
| 596 int num; | |
| 597 VEC (int, heap) *vertices; | |
| 598 } *rdgc; | |
| 599 | |
| 600 DEF_VEC_P (rdgc); | |
| 601 DEF_VEC_ALLOC_P (rdgc, heap); | |
| 602 | |
| 603 DEF_VEC_P (bitmap); | |
| 604 DEF_VEC_ALLOC_P (bitmap, heap); | |
| 605 | |
| 606 #endif /* GCC_TREE_DATA_REF_H */ |