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5f40b3cb | 1 | /* Loop autoparallelization. |
e08120b1 | 2 | Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 |
c75c517d | 3 | Free Software Foundation, Inc. |
70837b71 RL |
4 | Contributed by Sebastian Pop <pop@cri.ensmp.fr> |
5 | Zdenek Dvorak <dvorakz@suse.cz> and Razya Ladelsky <razya@il.ibm.com>. | |
5f40b3cb ZD |
6 | |
7 | This file is part of GCC. | |
8 | ||
9 | GCC is free software; you can redistribute it and/or modify it under | |
10 | the terms of the GNU General Public License as published by the Free | |
6da7fc87 | 11 | Software Foundation; either version 3, or (at your option) any later |
5f40b3cb ZD |
12 | version. |
13 | ||
14 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
15 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
16 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
17 | for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
6da7fc87 NC |
20 | along with GCC; see the file COPYING3. If not see |
21 | <http://www.gnu.org/licenses/>. */ | |
5f40b3cb ZD |
22 | |
23 | #include "config.h" | |
24 | #include "system.h" | |
25 | #include "coretypes.h" | |
5f40b3cb ZD |
26 | #include "tree-flow.h" |
27 | #include "cfgloop.h" | |
5f40b3cb | 28 | #include "tree-data-ref.h" |
1bd6497c | 29 | #include "tree-scalar-evolution.h" |
cf835838 | 30 | #include "gimple-pretty-print.h" |
5f40b3cb | 31 | #include "tree-pass.h" |
5f40b3cb | 32 | #include "langhooks.h" |
a509ebb5 | 33 | #include "tree-vectorizer.h" |
5f40b3cb ZD |
34 | |
35 | /* This pass tries to distribute iterations of loops into several threads. | |
36 | The implementation is straightforward -- for each loop we test whether its | |
37 | iterations are independent, and if it is the case (and some additional | |
38 | conditions regarding profitability and correctness are satisfied), we | |
726a989a RB |
39 | add GIMPLE_OMP_PARALLEL and GIMPLE_OMP_FOR codes and let omp expansion |
40 | machinery do its job. | |
b8698a0f | 41 | |
5f40b3cb ZD |
42 | The most of the complexity is in bringing the code into shape expected |
43 | by the omp expanders: | |
726a989a RB |
44 | -- for GIMPLE_OMP_FOR, ensuring that the loop has only one induction |
45 | variable and that the exit test is at the start of the loop body | |
46 | -- for GIMPLE_OMP_PARALLEL, replacing the references to local addressable | |
5f40b3cb ZD |
47 | variables by accesses through pointers, and breaking up ssa chains |
48 | by storing the values incoming to the parallelized loop to a structure | |
49 | passed to the new function as an argument (something similar is done | |
50 | in omp gimplification, unfortunately only a small part of the code | |
51 | can be shared). | |
52 | ||
53 | TODO: | |
54 | -- if there are several parallelizable loops in a function, it may be | |
55 | possible to generate the threads just once (using synchronization to | |
56 | ensure that cross-loop dependences are obeyed). | |
70837b71 RL |
57 | -- handling of common reduction patterns for outer loops. |
58 | ||
59 | More info can also be found at http://gcc.gnu.org/wiki/AutoParInGCC */ | |
b8698a0f | 60 | /* |
a509ebb5 | 61 | Reduction handling: |
8a9ecffd | 62 | currently we use vect_force_simple_reduction() to detect reduction patterns. |
a509ebb5 | 63 | The code transformation will be introduced by an example. |
b8698a0f L |
64 | |
65 | ||
a509ebb5 RL |
66 | parloop |
67 | { | |
68 | int sum=1; | |
69 | ||
0eb7e7aa | 70 | for (i = 0; i < N; i++) |
a509ebb5 RL |
71 | { |
72 | x[i] = i + 3; | |
73 | sum+=x[i]; | |
74 | } | |
75 | } | |
76 | ||
0eb7e7aa | 77 | gimple-like code: |
a509ebb5 RL |
78 | header_bb: |
79 | ||
0eb7e7aa RL |
80 | # sum_29 = PHI <sum_11(5), 1(3)> |
81 | # i_28 = PHI <i_12(5), 0(3)> | |
82 | D.1795_8 = i_28 + 3; | |
83 | x[i_28] = D.1795_8; | |
84 | sum_11 = D.1795_8 + sum_29; | |
85 | i_12 = i_28 + 1; | |
86 | if (N_6(D) > i_12) | |
87 | goto header_bb; | |
88 | ||
a509ebb5 RL |
89 | |
90 | exit_bb: | |
91 | ||
0eb7e7aa RL |
92 | # sum_21 = PHI <sum_11(4)> |
93 | printf (&"%d"[0], sum_21); | |
a509ebb5 RL |
94 | |
95 | ||
96 | after reduction transformation (only relevant parts): | |
97 | ||
98 | parloop | |
99 | { | |
100 | ||
101 | .... | |
102 | ||
0eb7e7aa | 103 | |
fa10beec | 104 | # Storing the initial value given by the user. # |
0eb7e7aa | 105 | |
ae0bce62 | 106 | .paral_data_store.32.sum.27 = 1; |
b8698a0f L |
107 | |
108 | #pragma omp parallel num_threads(4) | |
a509ebb5 | 109 | |
0eb7e7aa | 110 | #pragma omp for schedule(static) |
ae0bce62 RL |
111 | |
112 | # The neutral element corresponding to the particular | |
113 | reduction's operation, e.g. 0 for PLUS_EXPR, | |
114 | 1 for MULT_EXPR, etc. replaces the user's initial value. # | |
115 | ||
116 | # sum.27_29 = PHI <sum.27_11, 0> | |
117 | ||
0eb7e7aa | 118 | sum.27_11 = D.1827_8 + sum.27_29; |
ae0bce62 | 119 | |
726a989a | 120 | GIMPLE_OMP_CONTINUE |
a509ebb5 | 121 | |
0eb7e7aa RL |
122 | # Adding this reduction phi is done at create_phi_for_local_result() # |
123 | # sum.27_56 = PHI <sum.27_11, 0> | |
726a989a | 124 | GIMPLE_OMP_RETURN |
b8698a0f L |
125 | |
126 | # Creating the atomic operation is done at | |
0eb7e7aa | 127 | create_call_for_reduction_1() # |
a509ebb5 | 128 | |
0eb7e7aa RL |
129 | #pragma omp atomic_load |
130 | D.1839_59 = *&.paral_data_load.33_51->reduction.23; | |
131 | D.1840_60 = sum.27_56 + D.1839_59; | |
132 | #pragma omp atomic_store (D.1840_60); | |
b8698a0f | 133 | |
726a989a | 134 | GIMPLE_OMP_RETURN |
b8698a0f | 135 | |
0eb7e7aa RL |
136 | # collecting the result after the join of the threads is done at |
137 | create_loads_for_reductions(). | |
ae0bce62 RL |
138 | The value computed by the threads is loaded from the |
139 | shared struct. # | |
140 | ||
b8698a0f | 141 | |
0eb7e7aa | 142 | .paral_data_load.33_52 = &.paral_data_store.32; |
ae0bce62 | 143 | sum_37 = .paral_data_load.33_52->sum.27; |
0eb7e7aa RL |
144 | sum_43 = D.1795_41 + sum_37; |
145 | ||
146 | exit bb: | |
147 | # sum_21 = PHI <sum_43, sum_26> | |
148 | printf (&"%d"[0], sum_21); | |
149 | ||
150 | ... | |
151 | ||
a509ebb5 RL |
152 | } |
153 | ||
154 | */ | |
155 | ||
5f40b3cb ZD |
156 | /* Minimal number of iterations of a loop that should be executed in each |
157 | thread. */ | |
158 | #define MIN_PER_THREAD 100 | |
159 | ||
b8698a0f | 160 | /* Element of the hashtable, representing a |
a509ebb5 RL |
161 | reduction in the current loop. */ |
162 | struct reduction_info | |
163 | { | |
726a989a RB |
164 | gimple reduc_stmt; /* reduction statement. */ |
165 | gimple reduc_phi; /* The phi node defining the reduction. */ | |
166 | enum tree_code reduction_code;/* code for the reduction operation. */ | |
5d1fd1de JJ |
167 | unsigned reduc_version; /* SSA_NAME_VERSION of original reduc_phi |
168 | result. */ | |
b8698a0f | 169 | gimple keep_res; /* The PHI_RESULT of this phi is the resulting value |
a509ebb5 | 170 | of the reduction variable when existing the loop. */ |
ae0bce62 | 171 | tree initial_value; /* The initial value of the reduction var before entering the loop. */ |
a509ebb5 | 172 | tree field; /* the name of the field in the parloop data structure intended for reduction. */ |
a509ebb5 | 173 | tree init; /* reduction initialization value. */ |
b8698a0f | 174 | gimple new_phi; /* (helper field) Newly created phi node whose result |
a509ebb5 RL |
175 | will be passed to the atomic operation. Represents |
176 | the local result each thread computed for the reduction | |
177 | operation. */ | |
178 | }; | |
179 | ||
180 | /* Equality and hash functions for hashtab code. */ | |
181 | ||
182 | static int | |
183 | reduction_info_eq (const void *aa, const void *bb) | |
184 | { | |
185 | const struct reduction_info *a = (const struct reduction_info *) aa; | |
186 | const struct reduction_info *b = (const struct reduction_info *) bb; | |
187 | ||
188 | return (a->reduc_phi == b->reduc_phi); | |
189 | } | |
190 | ||
191 | static hashval_t | |
192 | reduction_info_hash (const void *aa) | |
193 | { | |
194 | const struct reduction_info *a = (const struct reduction_info *) aa; | |
195 | ||
5d1fd1de | 196 | return a->reduc_version; |
a509ebb5 RL |
197 | } |
198 | ||
199 | static struct reduction_info * | |
726a989a | 200 | reduction_phi (htab_t reduction_list, gimple phi) |
a509ebb5 RL |
201 | { |
202 | struct reduction_info tmpred, *red; | |
203 | ||
87ebde38 | 204 | if (htab_elements (reduction_list) == 0 || phi == NULL) |
a509ebb5 RL |
205 | return NULL; |
206 | ||
207 | tmpred.reduc_phi = phi; | |
5d1fd1de | 208 | tmpred.reduc_version = gimple_uid (phi); |
3d9a9f94 | 209 | red = (struct reduction_info *) htab_find (reduction_list, &tmpred); |
a509ebb5 RL |
210 | |
211 | return red; | |
212 | } | |
213 | ||
5f40b3cb ZD |
214 | /* Element of hashtable of names to copy. */ |
215 | ||
216 | struct name_to_copy_elt | |
217 | { | |
218 | unsigned version; /* The version of the name to copy. */ | |
219 | tree new_name; /* The new name used in the copy. */ | |
220 | tree field; /* The field of the structure used to pass the | |
221 | value. */ | |
222 | }; | |
223 | ||
224 | /* Equality and hash functions for hashtab code. */ | |
225 | ||
226 | static int | |
227 | name_to_copy_elt_eq (const void *aa, const void *bb) | |
228 | { | |
a509ebb5 RL |
229 | const struct name_to_copy_elt *a = (const struct name_to_copy_elt *) aa; |
230 | const struct name_to_copy_elt *b = (const struct name_to_copy_elt *) bb; | |
5f40b3cb ZD |
231 | |
232 | return a->version == b->version; | |
233 | } | |
234 | ||
235 | static hashval_t | |
236 | name_to_copy_elt_hash (const void *aa) | |
237 | { | |
a509ebb5 | 238 | const struct name_to_copy_elt *a = (const struct name_to_copy_elt *) aa; |
5f40b3cb ZD |
239 | |
240 | return (hashval_t) a->version; | |
241 | } | |
242 | ||
b305e3da SP |
243 | /* A transformation matrix, which is a self-contained ROWSIZE x COLSIZE |
244 | matrix. Rather than use floats, we simply keep a single DENOMINATOR that | |
245 | represents the denominator for every element in the matrix. */ | |
246 | typedef struct lambda_trans_matrix_s | |
247 | { | |
248 | lambda_matrix matrix; | |
249 | int rowsize; | |
250 | int colsize; | |
251 | int denominator; | |
252 | } *lambda_trans_matrix; | |
253 | #define LTM_MATRIX(T) ((T)->matrix) | |
254 | #define LTM_ROWSIZE(T) ((T)->rowsize) | |
255 | #define LTM_COLSIZE(T) ((T)->colsize) | |
256 | #define LTM_DENOMINATOR(T) ((T)->denominator) | |
257 | ||
258 | /* Allocate a new transformation matrix. */ | |
259 | ||
260 | static lambda_trans_matrix | |
261 | lambda_trans_matrix_new (int colsize, int rowsize, | |
262 | struct obstack * lambda_obstack) | |
263 | { | |
264 | lambda_trans_matrix ret; | |
265 | ||
266 | ret = (lambda_trans_matrix) | |
267 | obstack_alloc (lambda_obstack, sizeof (struct lambda_trans_matrix_s)); | |
268 | LTM_MATRIX (ret) = lambda_matrix_new (rowsize, colsize, lambda_obstack); | |
269 | LTM_ROWSIZE (ret) = rowsize; | |
270 | LTM_COLSIZE (ret) = colsize; | |
271 | LTM_DENOMINATOR (ret) = 1; | |
272 | return ret; | |
273 | } | |
274 | ||
275 | /* Multiply a vector VEC by a matrix MAT. | |
276 | MAT is an M*N matrix, and VEC is a vector with length N. The result | |
277 | is stored in DEST which must be a vector of length M. */ | |
278 | ||
279 | static void | |
280 | lambda_matrix_vector_mult (lambda_matrix matrix, int m, int n, | |
281 | lambda_vector vec, lambda_vector dest) | |
282 | { | |
283 | int i, j; | |
284 | ||
285 | lambda_vector_clear (dest, m); | |
286 | for (i = 0; i < m; i++) | |
287 | for (j = 0; j < n; j++) | |
288 | dest[i] += matrix[i][j] * vec[j]; | |
289 | } | |
290 | ||
291 | /* Return true if TRANS is a legal transformation matrix that respects | |
292 | the dependence vectors in DISTS and DIRS. The conservative answer | |
293 | is false. | |
294 | ||
295 | "Wolfe proves that a unimodular transformation represented by the | |
296 | matrix T is legal when applied to a loop nest with a set of | |
297 | lexicographically non-negative distance vectors RDG if and only if | |
298 | for each vector d in RDG, (T.d >= 0) is lexicographically positive. | |
299 | i.e.: if and only if it transforms the lexicographically positive | |
300 | distance vectors to lexicographically positive vectors. Note that | |
301 | a unimodular matrix must transform the zero vector (and only it) to | |
302 | the zero vector." S.Muchnick. */ | |
303 | ||
304 | static bool | |
305 | lambda_transform_legal_p (lambda_trans_matrix trans, | |
306 | int nb_loops, | |
307 | VEC (ddr_p, heap) *dependence_relations) | |
308 | { | |
309 | unsigned int i, j; | |
310 | lambda_vector distres; | |
311 | struct data_dependence_relation *ddr; | |
312 | ||
313 | gcc_assert (LTM_COLSIZE (trans) == nb_loops | |
314 | && LTM_ROWSIZE (trans) == nb_loops); | |
315 | ||
316 | /* When there are no dependences, the transformation is correct. */ | |
317 | if (VEC_length (ddr_p, dependence_relations) == 0) | |
318 | return true; | |
319 | ||
320 | ddr = VEC_index (ddr_p, dependence_relations, 0); | |
321 | if (ddr == NULL) | |
322 | return true; | |
323 | ||
324 | /* When there is an unknown relation in the dependence_relations, we | |
325 | know that it is no worth looking at this loop nest: give up. */ | |
326 | if (DDR_ARE_DEPENDENT (ddr) == chrec_dont_know) | |
327 | return false; | |
328 | ||
329 | distres = lambda_vector_new (nb_loops); | |
330 | ||
331 | /* For each distance vector in the dependence graph. */ | |
332 | FOR_EACH_VEC_ELT (ddr_p, dependence_relations, i, ddr) | |
333 | { | |
334 | /* Don't care about relations for which we know that there is no | |
335 | dependence, nor about read-read (aka. output-dependences): | |
336 | these data accesses can happen in any order. */ | |
337 | if (DDR_ARE_DEPENDENT (ddr) == chrec_known | |
338 | || (DR_IS_READ (DDR_A (ddr)) && DR_IS_READ (DDR_B (ddr)))) | |
339 | continue; | |
340 | ||
341 | /* Conservatively answer: "this transformation is not valid". */ | |
342 | if (DDR_ARE_DEPENDENT (ddr) == chrec_dont_know) | |
343 | return false; | |
344 | ||
345 | /* If the dependence could not be captured by a distance vector, | |
346 | conservatively answer that the transform is not valid. */ | |
347 | if (DDR_NUM_DIST_VECTS (ddr) == 0) | |
348 | return false; | |
349 | ||
350 | /* Compute trans.dist_vect */ | |
351 | for (j = 0; j < DDR_NUM_DIST_VECTS (ddr); j++) | |
352 | { | |
353 | lambda_matrix_vector_mult (LTM_MATRIX (trans), nb_loops, nb_loops, | |
354 | DDR_DIST_VECT (ddr, j), distres); | |
355 | ||
356 | if (!lambda_vector_lexico_pos (distres, nb_loops)) | |
357 | return false; | |
358 | } | |
359 | } | |
360 | return true; | |
361 | } | |
08dab97a RL |
362 | |
363 | /* Data dependency analysis. Returns true if the iterations of LOOP | |
364 | are independent on each other (that is, if we can execute them | |
365 | in parallel). */ | |
5f40b3cb ZD |
366 | |
367 | static bool | |
f873b205 | 368 | loop_parallel_p (struct loop *loop, struct obstack * parloop_obstack) |
5f40b3cb | 369 | { |
01be8516 SP |
370 | VEC (loop_p, heap) *loop_nest; |
371 | VEC (ddr_p, heap) *dependence_relations; | |
726a989a | 372 | VEC (data_reference_p, heap) *datarefs; |
5f40b3cb ZD |
373 | lambda_trans_matrix trans; |
374 | bool ret = false; | |
5f40b3cb ZD |
375 | |
376 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
48710229 RL |
377 | { |
378 | fprintf (dump_file, "Considering loop %d\n", loop->num); | |
379 | if (!loop->inner) | |
380 | fprintf (dump_file, "loop is innermost\n"); | |
b8698a0f | 381 | else |
48710229 RL |
382 | fprintf (dump_file, "loop NOT innermost\n"); |
383 | } | |
5f40b3cb | 384 | |
5f40b3cb ZD |
385 | /* Check for problems with dependences. If the loop can be reversed, |
386 | the iterations are independent. */ | |
387 | datarefs = VEC_alloc (data_reference_p, heap, 10); | |
388 | dependence_relations = VEC_alloc (ddr_p, heap, 10 * 10); | |
01be8516 | 389 | loop_nest = VEC_alloc (loop_p, heap, 3); |
9ca3d00e AB |
390 | if (! compute_data_dependences_for_loop (loop, true, &loop_nest, &datarefs, |
391 | &dependence_relations)) | |
392 | { | |
393 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
394 | fprintf (dump_file, " FAILED: cannot analyze data dependencies\n"); | |
395 | ret = false; | |
396 | goto end; | |
397 | } | |
5f40b3cb ZD |
398 | if (dump_file && (dump_flags & TDF_DETAILS)) |
399 | dump_data_dependence_relations (dump_file, dependence_relations); | |
400 | ||
f873b205 | 401 | trans = lambda_trans_matrix_new (1, 1, parloop_obstack); |
5f40b3cb ZD |
402 | LTM_MATRIX (trans)[0][0] = -1; |
403 | ||
404 | if (lambda_transform_legal_p (trans, 1, dependence_relations)) | |
405 | { | |
406 | ret = true; | |
407 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
408 | fprintf (dump_file, " SUCCESS: may be parallelized\n"); | |
409 | } | |
410 | else if (dump_file && (dump_flags & TDF_DETAILS)) | |
a509ebb5 RL |
411 | fprintf (dump_file, |
412 | " FAILED: data dependencies exist across iterations\n"); | |
5f40b3cb | 413 | |
9ca3d00e | 414 | end: |
01be8516 | 415 | VEC_free (loop_p, heap, loop_nest); |
5f40b3cb ZD |
416 | free_dependence_relations (dependence_relations); |
417 | free_data_refs (datarefs); | |
418 | ||
419 | return ret; | |
420 | } | |
421 | ||
1d4af1e8 SP |
422 | /* Return true when LOOP contains basic blocks marked with the |
423 | BB_IRREDUCIBLE_LOOP flag. */ | |
424 | ||
425 | static inline bool | |
426 | loop_has_blocks_with_irreducible_flag (struct loop *loop) | |
427 | { | |
428 | unsigned i; | |
429 | basic_block *bbs = get_loop_body_in_dom_order (loop); | |
430 | bool res = true; | |
431 | ||
432 | for (i = 0; i < loop->num_nodes; i++) | |
433 | if (bbs[i]->flags & BB_IRREDUCIBLE_LOOP) | |
434 | goto end; | |
435 | ||
436 | res = false; | |
437 | end: | |
438 | free (bbs); | |
439 | return res; | |
440 | } | |
441 | ||
8a171a59 | 442 | /* Assigns the address of OBJ in TYPE to an ssa name, and returns this name. |
9f9f72aa | 443 | The assignment statement is placed on edge ENTRY. DECL_ADDRESS maps decls |
8a171a59 | 444 | to their addresses that can be reused. The address of OBJ is known to |
cba1eb61 JJ |
445 | be invariant in the whole function. Other needed statements are placed |
446 | right before GSI. */ | |
5f40b3cb ZD |
447 | |
448 | static tree | |
cba1eb61 JJ |
449 | take_address_of (tree obj, tree type, edge entry, htab_t decl_address, |
450 | gimple_stmt_iterator *gsi) | |
5f40b3cb | 451 | { |
8a171a59 | 452 | int uid; |
5f40b3cb ZD |
453 | void **dslot; |
454 | struct int_tree_map ielt, *nielt; | |
83d5977e | 455 | tree *var_p, name, addr; |
726a989a RB |
456 | gimple stmt; |
457 | gimple_seq stmts; | |
5f40b3cb | 458 | |
8a171a59 ZD |
459 | /* Since the address of OBJ is invariant, the trees may be shared. |
460 | Avoid rewriting unrelated parts of the code. */ | |
461 | obj = unshare_expr (obj); | |
462 | for (var_p = &obj; | |
463 | handled_component_p (*var_p); | |
464 | var_p = &TREE_OPERAND (*var_p, 0)) | |
465 | continue; | |
8a171a59 | 466 | |
c9a410f0 RG |
467 | /* Canonicalize the access to base on a MEM_REF. */ |
468 | if (DECL_P (*var_p)) | |
469 | *var_p = build_simple_mem_ref (build_fold_addr_expr (*var_p)); | |
470 | ||
471 | /* Assign a canonical SSA name to the address of the base decl used | |
472 | in the address and share it for all accesses and addresses based | |
473 | on it. */ | |
474 | uid = DECL_UID (TREE_OPERAND (TREE_OPERAND (*var_p, 0), 0)); | |
5f40b3cb ZD |
475 | ielt.uid = uid; |
476 | dslot = htab_find_slot_with_hash (decl_address, &ielt, uid, INSERT); | |
477 | if (!*dslot) | |
478 | { | |
cba1eb61 JJ |
479 | if (gsi == NULL) |
480 | return NULL; | |
c9a410f0 | 481 | addr = TREE_OPERAND (*var_p, 0); |
83d5977e RG |
482 | name = make_temp_ssa_name (TREE_TYPE (addr), NULL, |
483 | get_name (TREE_OPERAND | |
484 | (TREE_OPERAND (*var_p, 0), 0))); | |
485 | stmt = gimple_build_assign (name, addr); | |
726a989a | 486 | gsi_insert_on_edge_immediate (entry, stmt); |
5f40b3cb ZD |
487 | |
488 | nielt = XNEW (struct int_tree_map); | |
489 | nielt->uid = uid; | |
490 | nielt->to = name; | |
491 | *dslot = nielt; | |
5f40b3cb | 492 | } |
8a171a59 ZD |
493 | else |
494 | name = ((struct int_tree_map *) *dslot)->to; | |
5f40b3cb | 495 | |
c9a410f0 RG |
496 | /* Express the address in terms of the canonical SSA name. */ |
497 | TREE_OPERAND (*var_p, 0) = name; | |
cba1eb61 JJ |
498 | if (gsi == NULL) |
499 | return build_fold_addr_expr_with_type (obj, type); | |
500 | ||
c9a410f0 RG |
501 | name = force_gimple_operand (build_addr (obj, current_function_decl), |
502 | &stmts, true, NULL_TREE); | |
503 | if (!gimple_seq_empty_p (stmts)) | |
cba1eb61 | 504 | gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT); |
5f40b3cb | 505 | |
c9a410f0 | 506 | if (!useless_type_conversion_p (type, TREE_TYPE (name))) |
8a171a59 | 507 | { |
726a989a | 508 | name = force_gimple_operand (fold_convert (type, name), &stmts, true, |
8a171a59 | 509 | NULL_TREE); |
726a989a | 510 | if (!gimple_seq_empty_p (stmts)) |
cba1eb61 | 511 | gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT); |
8a171a59 | 512 | } |
5f40b3cb ZD |
513 | |
514 | return name; | |
515 | } | |
516 | ||
a509ebb5 | 517 | /* Callback for htab_traverse. Create the initialization statement |
b8698a0f | 518 | for reduction described in SLOT, and place it at the preheader of |
a509ebb5 RL |
519 | the loop described in DATA. */ |
520 | ||
521 | static int | |
522 | initialize_reductions (void **slot, void *data) | |
523 | { | |
a509ebb5 | 524 | tree init, c; |
a509ebb5 RL |
525 | tree bvar, type, arg; |
526 | edge e; | |
527 | ||
3d9a9f94 | 528 | struct reduction_info *const reduc = (struct reduction_info *) *slot; |
a509ebb5 RL |
529 | struct loop *loop = (struct loop *) data; |
530 | ||
b8698a0f | 531 | /* Create initialization in preheader: |
a509ebb5 RL |
532 | reduction_variable = initialization value of reduction. */ |
533 | ||
b8698a0f | 534 | /* In the phi node at the header, replace the argument coming |
a509ebb5 RL |
535 | from the preheader with the reduction initialization value. */ |
536 | ||
537 | /* Create a new variable to initialize the reduction. */ | |
538 | type = TREE_TYPE (PHI_RESULT (reduc->reduc_phi)); | |
539 | bvar = create_tmp_var (type, "reduction"); | |
a509ebb5 | 540 | |
c2255bc4 AH |
541 | c = build_omp_clause (gimple_location (reduc->reduc_stmt), |
542 | OMP_CLAUSE_REDUCTION); | |
a509ebb5 | 543 | OMP_CLAUSE_REDUCTION_CODE (c) = reduc->reduction_code; |
726a989a | 544 | OMP_CLAUSE_DECL (c) = SSA_NAME_VAR (gimple_assign_lhs (reduc->reduc_stmt)); |
a509ebb5 RL |
545 | |
546 | init = omp_reduction_init (c, TREE_TYPE (bvar)); | |
547 | reduc->init = init; | |
548 | ||
b8698a0f L |
549 | /* Replace the argument representing the initialization value |
550 | with the initialization value for the reduction (neutral | |
551 | element for the particular operation, e.g. 0 for PLUS_EXPR, | |
552 | 1 for MULT_EXPR, etc). | |
553 | Keep the old value in a new variable "reduction_initial", | |
554 | that will be taken in consideration after the parallel | |
0eb7e7aa | 555 | computing is done. */ |
a509ebb5 RL |
556 | |
557 | e = loop_preheader_edge (loop); | |
558 | arg = PHI_ARG_DEF_FROM_EDGE (reduc->reduc_phi, e); | |
559 | /* Create new variable to hold the initial value. */ | |
a509ebb5 | 560 | |
a509ebb5 | 561 | SET_USE (PHI_ARG_DEF_PTR_FROM_EDGE |
0eb7e7aa | 562 | (reduc->reduc_phi, loop_preheader_edge (loop)), init); |
ae0bce62 | 563 | reduc->initial_value = arg; |
a509ebb5 RL |
564 | return 1; |
565 | } | |
5f40b3cb ZD |
566 | |
567 | struct elv_data | |
568 | { | |
726a989a | 569 | struct walk_stmt_info info; |
9f9f72aa | 570 | edge entry; |
5f40b3cb | 571 | htab_t decl_address; |
cba1eb61 | 572 | gimple_stmt_iterator *gsi; |
5f40b3cb | 573 | bool changed; |
cba1eb61 | 574 | bool reset; |
5f40b3cb ZD |
575 | }; |
576 | ||
9f9f72aa AP |
577 | /* Eliminates references to local variables in *TP out of the single |
578 | entry single exit region starting at DTA->ENTRY. | |
579 | DECL_ADDRESS contains addresses of the references that had their | |
580 | address taken already. If the expression is changed, CHANGED is | |
581 | set to true. Callback for walk_tree. */ | |
a509ebb5 | 582 | |
5f40b3cb | 583 | static tree |
8a171a59 | 584 | eliminate_local_variables_1 (tree *tp, int *walk_subtrees, void *data) |
5f40b3cb | 585 | { |
3d9a9f94 | 586 | struct elv_data *const dta = (struct elv_data *) data; |
8a171a59 | 587 | tree t = *tp, var, addr, addr_type, type, obj; |
5f40b3cb ZD |
588 | |
589 | if (DECL_P (t)) | |
590 | { | |
591 | *walk_subtrees = 0; | |
592 | ||
593 | if (!SSA_VAR_P (t) || DECL_EXTERNAL (t)) | |
594 | return NULL_TREE; | |
595 | ||
596 | type = TREE_TYPE (t); | |
597 | addr_type = build_pointer_type (type); | |
cba1eb61 JJ |
598 | addr = take_address_of (t, addr_type, dta->entry, dta->decl_address, |
599 | dta->gsi); | |
600 | if (dta->gsi == NULL && addr == NULL_TREE) | |
601 | { | |
602 | dta->reset = true; | |
603 | return NULL_TREE; | |
604 | } | |
605 | ||
70f34814 | 606 | *tp = build_simple_mem_ref (addr); |
5f40b3cb ZD |
607 | |
608 | dta->changed = true; | |
609 | return NULL_TREE; | |
610 | } | |
611 | ||
612 | if (TREE_CODE (t) == ADDR_EXPR) | |
613 | { | |
8a171a59 ZD |
614 | /* ADDR_EXPR may appear in two contexts: |
615 | -- as a gimple operand, when the address taken is a function invariant | |
616 | -- as gimple rhs, when the resulting address in not a function | |
617 | invariant | |
618 | We do not need to do anything special in the latter case (the base of | |
619 | the memory reference whose address is taken may be replaced in the | |
620 | DECL_P case). The former case is more complicated, as we need to | |
621 | ensure that the new address is still a gimple operand. Thus, it | |
622 | is not sufficient to replace just the base of the memory reference -- | |
623 | we need to move the whole computation of the address out of the | |
624 | loop. */ | |
625 | if (!is_gimple_val (t)) | |
5f40b3cb ZD |
626 | return NULL_TREE; |
627 | ||
628 | *walk_subtrees = 0; | |
8a171a59 ZD |
629 | obj = TREE_OPERAND (t, 0); |
630 | var = get_base_address (obj); | |
631 | if (!var || !SSA_VAR_P (var) || DECL_EXTERNAL (var)) | |
5f40b3cb ZD |
632 | return NULL_TREE; |
633 | ||
634 | addr_type = TREE_TYPE (t); | |
cba1eb61 JJ |
635 | addr = take_address_of (obj, addr_type, dta->entry, dta->decl_address, |
636 | dta->gsi); | |
637 | if (dta->gsi == NULL && addr == NULL_TREE) | |
638 | { | |
639 | dta->reset = true; | |
640 | return NULL_TREE; | |
641 | } | |
5f40b3cb ZD |
642 | *tp = addr; |
643 | ||
644 | dta->changed = true; | |
645 | return NULL_TREE; | |
646 | } | |
647 | ||
726a989a | 648 | if (!EXPR_P (t)) |
5f40b3cb ZD |
649 | *walk_subtrees = 0; |
650 | ||
651 | return NULL_TREE; | |
652 | } | |
653 | ||
cba1eb61 | 654 | /* Moves the references to local variables in STMT at *GSI out of the single |
9f9f72aa AP |
655 | entry single exit region starting at ENTRY. DECL_ADDRESS contains |
656 | addresses of the references that had their address taken | |
657 | already. */ | |
5f40b3cb ZD |
658 | |
659 | static void | |
cba1eb61 | 660 | eliminate_local_variables_stmt (edge entry, gimple_stmt_iterator *gsi, |
5f40b3cb ZD |
661 | htab_t decl_address) |
662 | { | |
663 | struct elv_data dta; | |
cba1eb61 | 664 | gimple stmt = gsi_stmt (*gsi); |
5f40b3cb | 665 | |
726a989a | 666 | memset (&dta.info, '\0', sizeof (dta.info)); |
9f9f72aa | 667 | dta.entry = entry; |
5f40b3cb ZD |
668 | dta.decl_address = decl_address; |
669 | dta.changed = false; | |
cba1eb61 | 670 | dta.reset = false; |
5f40b3cb | 671 | |
b5b8b0ac | 672 | if (gimple_debug_bind_p (stmt)) |
cba1eb61 JJ |
673 | { |
674 | dta.gsi = NULL; | |
675 | walk_tree (gimple_debug_bind_get_value_ptr (stmt), | |
676 | eliminate_local_variables_1, &dta.info, NULL); | |
677 | if (dta.reset) | |
678 | { | |
679 | gimple_debug_bind_reset_value (stmt); | |
680 | dta.changed = true; | |
681 | } | |
682 | } | |
b5b8b0ac | 683 | else |
cba1eb61 JJ |
684 | { |
685 | dta.gsi = gsi; | |
686 | walk_gimple_op (stmt, eliminate_local_variables_1, &dta.info); | |
687 | } | |
5f40b3cb ZD |
688 | |
689 | if (dta.changed) | |
690 | update_stmt (stmt); | |
691 | } | |
692 | ||
9f9f72aa AP |
693 | /* Eliminates the references to local variables from the single entry |
694 | single exit region between the ENTRY and EXIT edges. | |
b8698a0f | 695 | |
a509ebb5 | 696 | This includes: |
b8698a0f L |
697 | 1) Taking address of a local variable -- these are moved out of the |
698 | region (and temporary variable is created to hold the address if | |
a509ebb5 | 699 | necessary). |
9f9f72aa | 700 | |
5f40b3cb | 701 | 2) Dereferencing a local variable -- these are replaced with indirect |
a509ebb5 | 702 | references. */ |
5f40b3cb ZD |
703 | |
704 | static void | |
9f9f72aa | 705 | eliminate_local_variables (edge entry, edge exit) |
5f40b3cb | 706 | { |
9f9f72aa AP |
707 | basic_block bb; |
708 | VEC (basic_block, heap) *body = VEC_alloc (basic_block, heap, 3); | |
5f40b3cb | 709 | unsigned i; |
726a989a | 710 | gimple_stmt_iterator gsi; |
cba1eb61 | 711 | bool has_debug_stmt = false; |
5f40b3cb ZD |
712 | htab_t decl_address = htab_create (10, int_tree_map_hash, int_tree_map_eq, |
713 | free); | |
9f9f72aa AP |
714 | basic_block entry_bb = entry->src; |
715 | basic_block exit_bb = exit->dest; | |
5f40b3cb | 716 | |
9f9f72aa | 717 | gather_blocks_in_sese_region (entry_bb, exit_bb, &body); |
5f40b3cb | 718 | |
ac47786e | 719 | FOR_EACH_VEC_ELT (basic_block, body, i, bb) |
9f9f72aa | 720 | if (bb != entry_bb && bb != exit_bb) |
726a989a | 721 | for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
ddb555ed JJ |
722 | if (is_gimple_debug (gsi_stmt (gsi))) |
723 | { | |
724 | if (gimple_debug_bind_p (gsi_stmt (gsi))) | |
725 | has_debug_stmt = true; | |
726 | } | |
cba1eb61 JJ |
727 | else |
728 | eliminate_local_variables_stmt (entry, &gsi, decl_address); | |
729 | ||
730 | if (has_debug_stmt) | |
731 | FOR_EACH_VEC_ELT (basic_block, body, i, bb) | |
732 | if (bb != entry_bb && bb != exit_bb) | |
733 | for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
734 | if (gimple_debug_bind_p (gsi_stmt (gsi))) | |
735 | eliminate_local_variables_stmt (entry, &gsi, decl_address); | |
5f40b3cb ZD |
736 | |
737 | htab_delete (decl_address); | |
9f9f72aa AP |
738 | VEC_free (basic_block, heap, body); |
739 | } | |
740 | ||
741 | /* Returns true if expression EXPR is not defined between ENTRY and | |
742 | EXIT, i.e. if all its operands are defined outside of the region. */ | |
743 | ||
744 | static bool | |
745 | expr_invariant_in_region_p (edge entry, edge exit, tree expr) | |
746 | { | |
747 | basic_block entry_bb = entry->src; | |
748 | basic_block exit_bb = exit->dest; | |
749 | basic_block def_bb; | |
9f9f72aa AP |
750 | |
751 | if (is_gimple_min_invariant (expr)) | |
752 | return true; | |
753 | ||
754 | if (TREE_CODE (expr) == SSA_NAME) | |
755 | { | |
726a989a | 756 | def_bb = gimple_bb (SSA_NAME_DEF_STMT (expr)); |
9f9f72aa AP |
757 | if (def_bb |
758 | && dominated_by_p (CDI_DOMINATORS, def_bb, entry_bb) | |
759 | && !dominated_by_p (CDI_DOMINATORS, def_bb, exit_bb)) | |
760 | return false; | |
761 | ||
762 | return true; | |
763 | } | |
764 | ||
726a989a | 765 | return false; |
5f40b3cb ZD |
766 | } |
767 | ||
768 | /* If COPY_NAME_P is true, creates and returns a duplicate of NAME. | |
769 | The copies are stored to NAME_COPIES, if NAME was already duplicated, | |
770 | its duplicate stored in NAME_COPIES is returned. | |
b8698a0f | 771 | |
5f40b3cb ZD |
772 | Regardless of COPY_NAME_P, the decl used as a base of the ssa name is also |
773 | duplicated, storing the copies in DECL_COPIES. */ | |
774 | ||
775 | static tree | |
9f9f72aa AP |
776 | separate_decls_in_region_name (tree name, |
777 | htab_t name_copies, htab_t decl_copies, | |
778 | bool copy_name_p) | |
5f40b3cb ZD |
779 | { |
780 | tree copy, var, var_copy; | |
781 | unsigned idx, uid, nuid; | |
782 | struct int_tree_map ielt, *nielt; | |
783 | struct name_to_copy_elt elt, *nelt; | |
784 | void **slot, **dslot; | |
785 | ||
786 | if (TREE_CODE (name) != SSA_NAME) | |
787 | return name; | |
788 | ||
789 | idx = SSA_NAME_VERSION (name); | |
790 | elt.version = idx; | |
791 | slot = htab_find_slot_with_hash (name_copies, &elt, idx, | |
792 | copy_name_p ? INSERT : NO_INSERT); | |
793 | if (slot && *slot) | |
794 | return ((struct name_to_copy_elt *) *slot)->new_name; | |
795 | ||
70b5e7dc RG |
796 | if (copy_name_p) |
797 | { | |
798 | copy = duplicate_ssa_name (name, NULL); | |
799 | nelt = XNEW (struct name_to_copy_elt); | |
800 | nelt->version = idx; | |
801 | nelt->new_name = copy; | |
802 | nelt->field = NULL_TREE; | |
803 | *slot = nelt; | |
804 | } | |
805 | else | |
806 | { | |
807 | gcc_assert (!slot); | |
808 | copy = name; | |
809 | } | |
810 | ||
5f40b3cb | 811 | var = SSA_NAME_VAR (name); |
70b5e7dc RG |
812 | if (!var) |
813 | return copy; | |
814 | ||
5f40b3cb ZD |
815 | uid = DECL_UID (var); |
816 | ielt.uid = uid; | |
817 | dslot = htab_find_slot_with_hash (decl_copies, &ielt, uid, INSERT); | |
818 | if (!*dslot) | |
819 | { | |
820 | var_copy = create_tmp_var (TREE_TYPE (var), get_name (var)); | |
36ad7922 | 821 | DECL_GIMPLE_REG_P (var_copy) = DECL_GIMPLE_REG_P (var); |
5f40b3cb ZD |
822 | nielt = XNEW (struct int_tree_map); |
823 | nielt->uid = uid; | |
824 | nielt->to = var_copy; | |
825 | *dslot = nielt; | |
826 | ||
827 | /* Ensure that when we meet this decl next time, we won't duplicate | |
a509ebb5 | 828 | it again. */ |
5f40b3cb ZD |
829 | nuid = DECL_UID (var_copy); |
830 | ielt.uid = nuid; | |
831 | dslot = htab_find_slot_with_hash (decl_copies, &ielt, nuid, INSERT); | |
832 | gcc_assert (!*dslot); | |
833 | nielt = XNEW (struct int_tree_map); | |
834 | nielt->uid = nuid; | |
835 | nielt->to = var_copy; | |
836 | *dslot = nielt; | |
837 | } | |
838 | else | |
839 | var_copy = ((struct int_tree_map *) *dslot)->to; | |
840 | ||
b2ec94d4 | 841 | replace_ssa_name_symbol (copy, var_copy); |
5f40b3cb ZD |
842 | return copy; |
843 | } | |
844 | ||
9f9f72aa AP |
845 | /* Finds the ssa names used in STMT that are defined outside the |
846 | region between ENTRY and EXIT and replaces such ssa names with | |
847 | their duplicates. The duplicates are stored to NAME_COPIES. Base | |
848 | decls of all ssa names used in STMT (including those defined in | |
849 | LOOP) are replaced with the new temporary variables; the | |
850 | replacement decls are stored in DECL_COPIES. */ | |
5f40b3cb ZD |
851 | |
852 | static void | |
726a989a | 853 | separate_decls_in_region_stmt (edge entry, edge exit, gimple stmt, |
9f9f72aa | 854 | htab_t name_copies, htab_t decl_copies) |
5f40b3cb ZD |
855 | { |
856 | use_operand_p use; | |
857 | def_operand_p def; | |
858 | ssa_op_iter oi; | |
859 | tree name, copy; | |
860 | bool copy_name_p; | |
861 | ||
5f40b3cb | 862 | FOR_EACH_PHI_OR_STMT_DEF (def, stmt, oi, SSA_OP_DEF) |
a509ebb5 RL |
863 | { |
864 | name = DEF_FROM_PTR (def); | |
865 | gcc_assert (TREE_CODE (name) == SSA_NAME); | |
9f9f72aa AP |
866 | copy = separate_decls_in_region_name (name, name_copies, decl_copies, |
867 | false); | |
a509ebb5 RL |
868 | gcc_assert (copy == name); |
869 | } | |
5f40b3cb ZD |
870 | |
871 | FOR_EACH_PHI_OR_STMT_USE (use, stmt, oi, SSA_OP_USE) | |
a509ebb5 RL |
872 | { |
873 | name = USE_FROM_PTR (use); | |
874 | if (TREE_CODE (name) != SSA_NAME) | |
875 | continue; | |
876 | ||
9f9f72aa AP |
877 | copy_name_p = expr_invariant_in_region_p (entry, exit, name); |
878 | copy = separate_decls_in_region_name (name, name_copies, decl_copies, | |
879 | copy_name_p); | |
a509ebb5 RL |
880 | SET_USE (use, copy); |
881 | } | |
5f40b3cb ZD |
882 | } |
883 | ||
b5b8b0ac AO |
884 | /* Finds the ssa names used in STMT that are defined outside the |
885 | region between ENTRY and EXIT and replaces such ssa names with | |
886 | their duplicates. The duplicates are stored to NAME_COPIES. Base | |
887 | decls of all ssa names used in STMT (including those defined in | |
888 | LOOP) are replaced with the new temporary variables; the | |
889 | replacement decls are stored in DECL_COPIES. */ | |
890 | ||
891 | static bool | |
ddb555ed JJ |
892 | separate_decls_in_region_debug (gimple stmt, htab_t name_copies, |
893 | htab_t decl_copies) | |
b5b8b0ac AO |
894 | { |
895 | use_operand_p use; | |
896 | ssa_op_iter oi; | |
897 | tree var, name; | |
898 | struct int_tree_map ielt; | |
899 | struct name_to_copy_elt elt; | |
900 | void **slot, **dslot; | |
901 | ||
ddb555ed JJ |
902 | if (gimple_debug_bind_p (stmt)) |
903 | var = gimple_debug_bind_get_var (stmt); | |
904 | else if (gimple_debug_source_bind_p (stmt)) | |
905 | var = gimple_debug_source_bind_get_var (stmt); | |
906 | else | |
907 | return true; | |
598e67d7 | 908 | if (TREE_CODE (var) == DEBUG_EXPR_DECL || TREE_CODE (var) == LABEL_DECL) |
4f2a9af8 | 909 | return true; |
b5b8b0ac AO |
910 | gcc_assert (DECL_P (var) && SSA_VAR_P (var)); |
911 | ielt.uid = DECL_UID (var); | |
912 | dslot = htab_find_slot_with_hash (decl_copies, &ielt, ielt.uid, NO_INSERT); | |
913 | if (!dslot) | |
914 | return true; | |
ddb555ed JJ |
915 | if (gimple_debug_bind_p (stmt)) |
916 | gimple_debug_bind_set_var (stmt, ((struct int_tree_map *) *dslot)->to); | |
917 | else if (gimple_debug_source_bind_p (stmt)) | |
918 | gimple_debug_source_bind_set_var (stmt, ((struct int_tree_map *) *dslot)->to); | |
b5b8b0ac AO |
919 | |
920 | FOR_EACH_PHI_OR_STMT_USE (use, stmt, oi, SSA_OP_USE) | |
921 | { | |
922 | name = USE_FROM_PTR (use); | |
923 | if (TREE_CODE (name) != SSA_NAME) | |
924 | continue; | |
925 | ||
926 | elt.version = SSA_NAME_VERSION (name); | |
927 | slot = htab_find_slot_with_hash (name_copies, &elt, elt.version, NO_INSERT); | |
928 | if (!slot) | |
929 | { | |
930 | gimple_debug_bind_reset_value (stmt); | |
931 | update_stmt (stmt); | |
932 | break; | |
933 | } | |
934 | ||
935 | SET_USE (use, ((struct name_to_copy_elt *) *slot)->new_name); | |
936 | } | |
937 | ||
938 | return false; | |
939 | } | |
940 | ||
0eb7e7aa RL |
941 | /* Callback for htab_traverse. Adds a field corresponding to the reduction |
942 | specified in SLOT. The type is passed in DATA. */ | |
943 | ||
944 | static int | |
945 | add_field_for_reduction (void **slot, void *data) | |
a509ebb5 | 946 | { |
b8698a0f | 947 | |
3d9a9f94 KG |
948 | struct reduction_info *const red = (struct reduction_info *) *slot; |
949 | tree const type = (tree) data; | |
726a989a | 950 | tree var = SSA_NAME_VAR (gimple_assign_lhs (red->reduc_stmt)); |
c2255bc4 AH |
951 | tree field = build_decl (gimple_location (red->reduc_stmt), |
952 | FIELD_DECL, DECL_NAME (var), TREE_TYPE (var)); | |
0eb7e7aa RL |
953 | |
954 | insert_field_into_struct (type, field); | |
955 | ||
956 | red->field = field; | |
957 | ||
958 | return 1; | |
959 | } | |
a509ebb5 | 960 | |
5f40b3cb | 961 | /* Callback for htab_traverse. Adds a field corresponding to a ssa name |
b8698a0f | 962 | described in SLOT. The type is passed in DATA. */ |
5f40b3cb ZD |
963 | |
964 | static int | |
965 | add_field_for_name (void **slot, void *data) | |
966 | { | |
3d9a9f94 KG |
967 | struct name_to_copy_elt *const elt = (struct name_to_copy_elt *) *slot; |
968 | tree type = (tree) data; | |
5f40b3cb | 969 | tree name = ssa_name (elt->version); |
70b5e7dc RG |
970 | tree field = build_decl (UNKNOWN_LOCATION, |
971 | FIELD_DECL, SSA_NAME_IDENTIFIER (name), | |
972 | TREE_TYPE (name)); | |
5f40b3cb ZD |
973 | |
974 | insert_field_into_struct (type, field); | |
975 | elt->field = field; | |
a509ebb5 | 976 | |
5f40b3cb ZD |
977 | return 1; |
978 | } | |
979 | ||
b8698a0f L |
980 | /* Callback for htab_traverse. A local result is the intermediate result |
981 | computed by a single | |
fa10beec | 982 | thread, or the initial value in case no iteration was executed. |
b8698a0f L |
983 | This function creates a phi node reflecting these values. |
984 | The phi's result will be stored in NEW_PHI field of the | |
985 | reduction's data structure. */ | |
a509ebb5 RL |
986 | |
987 | static int | |
988 | create_phi_for_local_result (void **slot, void *data) | |
989 | { | |
3d9a9f94 KG |
990 | struct reduction_info *const reduc = (struct reduction_info *) *slot; |
991 | const struct loop *const loop = (const struct loop *) data; | |
a509ebb5 | 992 | edge e; |
726a989a | 993 | gimple new_phi; |
a509ebb5 RL |
994 | basic_block store_bb; |
995 | tree local_res; | |
f5045c96 | 996 | source_location locus; |
a509ebb5 | 997 | |
b8698a0f L |
998 | /* STORE_BB is the block where the phi |
999 | should be stored. It is the destination of the loop exit. | |
726a989a | 1000 | (Find the fallthru edge from GIMPLE_OMP_CONTINUE). */ |
a509ebb5 RL |
1001 | store_bb = FALLTHRU_EDGE (loop->latch)->dest; |
1002 | ||
1003 | /* STORE_BB has two predecessors. One coming from the loop | |
1004 | (the reduction's result is computed at the loop), | |
b8698a0f L |
1005 | and another coming from a block preceding the loop, |
1006 | when no iterations | |
1007 | are executed (the initial value should be taken). */ | |
a509ebb5 RL |
1008 | if (EDGE_PRED (store_bb, 0) == FALLTHRU_EDGE (loop->latch)) |
1009 | e = EDGE_PRED (store_bb, 1); | |
1010 | else | |
1011 | e = EDGE_PRED (store_bb, 0); | |
6b4a85ad | 1012 | local_res = copy_ssa_name (gimple_assign_lhs (reduc->reduc_stmt), NULL); |
f5045c96 | 1013 | locus = gimple_location (reduc->reduc_stmt); |
a509ebb5 | 1014 | new_phi = create_phi_node (local_res, store_bb); |
9e227d60 | 1015 | add_phi_arg (new_phi, reduc->init, e, locus); |
726a989a | 1016 | add_phi_arg (new_phi, gimple_assign_lhs (reduc->reduc_stmt), |
9e227d60 | 1017 | FALLTHRU_EDGE (loop->latch), locus); |
a509ebb5 RL |
1018 | reduc->new_phi = new_phi; |
1019 | ||
1020 | return 1; | |
1021 | } | |
5f40b3cb ZD |
1022 | |
1023 | struct clsn_data | |
1024 | { | |
1025 | tree store; | |
1026 | tree load; | |
1027 | ||
1028 | basic_block store_bb; | |
1029 | basic_block load_bb; | |
1030 | }; | |
1031 | ||
a509ebb5 | 1032 | /* Callback for htab_traverse. Create an atomic instruction for the |
b8698a0f | 1033 | reduction described in SLOT. |
a509ebb5 RL |
1034 | DATA annotates the place in memory the atomic operation relates to, |
1035 | and the basic block it needs to be generated in. */ | |
1036 | ||
1037 | static int | |
1038 | create_call_for_reduction_1 (void **slot, void *data) | |
1039 | { | |
3d9a9f94 KG |
1040 | struct reduction_info *const reduc = (struct reduction_info *) *slot; |
1041 | struct clsn_data *const clsn_data = (struct clsn_data *) data; | |
726a989a | 1042 | gimple_stmt_iterator gsi; |
a509ebb5 | 1043 | tree type = TREE_TYPE (PHI_RESULT (reduc->reduc_phi)); |
a509ebb5 RL |
1044 | tree load_struct; |
1045 | basic_block bb; | |
1046 | basic_block new_bb; | |
1047 | edge e; | |
0f900dfa | 1048 | tree t, addr, ref, x; |
726a989a RB |
1049 | tree tmp_load, name; |
1050 | gimple load; | |
a509ebb5 | 1051 | |
70f34814 | 1052 | load_struct = build_simple_mem_ref (clsn_data->load); |
a509ebb5 | 1053 | t = build3 (COMPONENT_REF, type, load_struct, reduc->field, NULL_TREE); |
a509ebb5 RL |
1054 | |
1055 | addr = build_addr (t, current_function_decl); | |
1056 | ||
1057 | /* Create phi node. */ | |
1058 | bb = clsn_data->load_bb; | |
1059 | ||
1060 | e = split_block (bb, t); | |
1061 | new_bb = e->dest; | |
1062 | ||
1063 | tmp_load = create_tmp_var (TREE_TYPE (TREE_TYPE (addr)), NULL); | |
a509ebb5 | 1064 | tmp_load = make_ssa_name (tmp_load, NULL); |
726a989a | 1065 | load = gimple_build_omp_atomic_load (tmp_load, addr); |
a509ebb5 | 1066 | SSA_NAME_DEF_STMT (tmp_load) = load; |
726a989a RB |
1067 | gsi = gsi_start_bb (new_bb); |
1068 | gsi_insert_after (&gsi, load, GSI_NEW_STMT); | |
a509ebb5 RL |
1069 | |
1070 | e = split_block (new_bb, load); | |
1071 | new_bb = e->dest; | |
726a989a | 1072 | gsi = gsi_start_bb (new_bb); |
a509ebb5 | 1073 | ref = tmp_load; |
726a989a RB |
1074 | x = fold_build2 (reduc->reduction_code, |
1075 | TREE_TYPE (PHI_RESULT (reduc->new_phi)), ref, | |
1076 | PHI_RESULT (reduc->new_phi)); | |
a509ebb5 | 1077 | |
726a989a RB |
1078 | name = force_gimple_operand_gsi (&gsi, x, true, NULL_TREE, true, |
1079 | GSI_CONTINUE_LINKING); | |
a509ebb5 | 1080 | |
726a989a | 1081 | gsi_insert_after (&gsi, gimple_build_omp_atomic_store (name), GSI_NEW_STMT); |
a509ebb5 RL |
1082 | return 1; |
1083 | } | |
1084 | ||
b8698a0f L |
1085 | /* Create the atomic operation at the join point of the threads. |
1086 | REDUCTION_LIST describes the reductions in the LOOP. | |
1087 | LD_ST_DATA describes the shared data structure where | |
a509ebb5 RL |
1088 | shared data is stored in and loaded from. */ |
1089 | static void | |
b8698a0f | 1090 | create_call_for_reduction (struct loop *loop, htab_t reduction_list, |
a509ebb5 RL |
1091 | struct clsn_data *ld_st_data) |
1092 | { | |
1093 | htab_traverse (reduction_list, create_phi_for_local_result, loop); | |
726a989a | 1094 | /* Find the fallthru edge from GIMPLE_OMP_CONTINUE. */ |
a509ebb5 RL |
1095 | ld_st_data->load_bb = FALLTHRU_EDGE (loop->latch)->dest; |
1096 | htab_traverse (reduction_list, create_call_for_reduction_1, ld_st_data); | |
1097 | } | |
1098 | ||
ae0bce62 RL |
1099 | /* Callback for htab_traverse. Loads the final reduction value at the |
1100 | join point of all threads, and inserts it in the right place. */ | |
a509ebb5 RL |
1101 | |
1102 | static int | |
1103 | create_loads_for_reductions (void **slot, void *data) | |
1104 | { | |
3d9a9f94 KG |
1105 | struct reduction_info *const red = (struct reduction_info *) *slot; |
1106 | struct clsn_data *const clsn_data = (struct clsn_data *) data; | |
726a989a RB |
1107 | gimple stmt; |
1108 | gimple_stmt_iterator gsi; | |
1109 | tree type = TREE_TYPE (gimple_assign_lhs (red->reduc_stmt)); | |
a509ebb5 | 1110 | tree load_struct; |
ae0bce62 | 1111 | tree name; |
a509ebb5 RL |
1112 | tree x; |
1113 | ||
726a989a | 1114 | gsi = gsi_after_labels (clsn_data->load_bb); |
70f34814 | 1115 | load_struct = build_simple_mem_ref (clsn_data->load); |
a509ebb5 RL |
1116 | load_struct = build3 (COMPONENT_REF, type, load_struct, red->field, |
1117 | NULL_TREE); | |
a509ebb5 | 1118 | |
ae0bce62 | 1119 | x = load_struct; |
a509ebb5 | 1120 | name = PHI_RESULT (red->keep_res); |
726a989a | 1121 | stmt = gimple_build_assign (name, x); |
a509ebb5 RL |
1122 | SSA_NAME_DEF_STMT (name) = stmt; |
1123 | ||
726a989a | 1124 | gsi_insert_after (&gsi, stmt, GSI_NEW_STMT); |
a509ebb5 | 1125 | |
726a989a RB |
1126 | for (gsi = gsi_start_phis (gimple_bb (red->keep_res)); |
1127 | !gsi_end_p (gsi); gsi_next (&gsi)) | |
1128 | if (gsi_stmt (gsi) == red->keep_res) | |
1129 | { | |
1130 | remove_phi_node (&gsi, false); | |
1131 | return 1; | |
1132 | } | |
1133 | gcc_unreachable (); | |
a509ebb5 RL |
1134 | } |
1135 | ||
b8698a0f | 1136 | /* Load the reduction result that was stored in LD_ST_DATA. |
a509ebb5 | 1137 | REDUCTION_LIST describes the list of reductions that the |
fa10beec | 1138 | loads should be generated for. */ |
a509ebb5 | 1139 | static void |
b8698a0f | 1140 | create_final_loads_for_reduction (htab_t reduction_list, |
a509ebb5 RL |
1141 | struct clsn_data *ld_st_data) |
1142 | { | |
726a989a | 1143 | gimple_stmt_iterator gsi; |
a509ebb5 | 1144 | tree t; |
726a989a | 1145 | gimple stmt; |
a509ebb5 | 1146 | |
726a989a | 1147 | gsi = gsi_after_labels (ld_st_data->load_bb); |
a509ebb5 | 1148 | t = build_fold_addr_expr (ld_st_data->store); |
726a989a | 1149 | stmt = gimple_build_assign (ld_st_data->load, t); |
a509ebb5 | 1150 | |
726a989a RB |
1151 | gsi_insert_before (&gsi, stmt, GSI_NEW_STMT); |
1152 | SSA_NAME_DEF_STMT (ld_st_data->load) = stmt; | |
a509ebb5 RL |
1153 | |
1154 | htab_traverse (reduction_list, create_loads_for_reductions, ld_st_data); | |
1155 | ||
1156 | } | |
1157 | ||
0eb7e7aa RL |
1158 | /* Callback for htab_traverse. Store the neutral value for the |
1159 | particular reduction's operation, e.g. 0 for PLUS_EXPR, | |
1160 | 1 for MULT_EXPR, etc. into the reduction field. | |
b8698a0f L |
1161 | The reduction is specified in SLOT. The store information is |
1162 | passed in DATA. */ | |
0eb7e7aa RL |
1163 | |
1164 | static int | |
1165 | create_stores_for_reduction (void **slot, void *data) | |
1166 | { | |
3d9a9f94 KG |
1167 | struct reduction_info *const red = (struct reduction_info *) *slot; |
1168 | struct clsn_data *const clsn_data = (struct clsn_data *) data; | |
726a989a RB |
1169 | tree t; |
1170 | gimple stmt; | |
1171 | gimple_stmt_iterator gsi; | |
1172 | tree type = TREE_TYPE (gimple_assign_lhs (red->reduc_stmt)); | |
1173 | ||
1174 | gsi = gsi_last_bb (clsn_data->store_bb); | |
1175 | t = build3 (COMPONENT_REF, type, clsn_data->store, red->field, NULL_TREE); | |
1176 | stmt = gimple_build_assign (t, red->initial_value); | |
726a989a | 1177 | gsi_insert_after (&gsi, stmt, GSI_NEW_STMT); |
0eb7e7aa RL |
1178 | |
1179 | return 1; | |
1180 | } | |
1181 | ||
a509ebb5 RL |
1182 | /* Callback for htab_traverse. Creates loads to a field of LOAD in LOAD_BB and |
1183 | store to a field of STORE in STORE_BB for the ssa name and its duplicate | |
1184 | specified in SLOT. */ | |
1185 | ||
5f40b3cb ZD |
1186 | static int |
1187 | create_loads_and_stores_for_name (void **slot, void *data) | |
1188 | { | |
3d9a9f94 KG |
1189 | struct name_to_copy_elt *const elt = (struct name_to_copy_elt *) *slot; |
1190 | struct clsn_data *const clsn_data = (struct clsn_data *) data; | |
726a989a RB |
1191 | tree t; |
1192 | gimple stmt; | |
1193 | gimple_stmt_iterator gsi; | |
5f40b3cb | 1194 | tree type = TREE_TYPE (elt->new_name); |
5f40b3cb ZD |
1195 | tree load_struct; |
1196 | ||
726a989a RB |
1197 | gsi = gsi_last_bb (clsn_data->store_bb); |
1198 | t = build3 (COMPONENT_REF, type, clsn_data->store, elt->field, NULL_TREE); | |
1199 | stmt = gimple_build_assign (t, ssa_name (elt->version)); | |
726a989a | 1200 | gsi_insert_after (&gsi, stmt, GSI_NEW_STMT); |
5f40b3cb | 1201 | |
726a989a | 1202 | gsi = gsi_last_bb (clsn_data->load_bb); |
70f34814 | 1203 | load_struct = build_simple_mem_ref (clsn_data->load); |
726a989a RB |
1204 | t = build3 (COMPONENT_REF, type, load_struct, elt->field, NULL_TREE); |
1205 | stmt = gimple_build_assign (elt->new_name, t); | |
5f40b3cb | 1206 | SSA_NAME_DEF_STMT (elt->new_name) = stmt; |
726a989a | 1207 | gsi_insert_after (&gsi, stmt, GSI_NEW_STMT); |
5f40b3cb ZD |
1208 | |
1209 | return 1; | |
1210 | } | |
1211 | ||
1212 | /* Moves all the variables used in LOOP and defined outside of it (including | |
1213 | the initial values of loop phi nodes, and *PER_THREAD if it is a ssa | |
1214 | name) to a structure created for this purpose. The code | |
b8698a0f | 1215 | |
5f40b3cb ZD |
1216 | while (1) |
1217 | { | |
1218 | use (a); | |
1219 | use (b); | |
1220 | } | |
1221 | ||
1222 | is transformed this way: | |
1223 | ||
1224 | bb0: | |
1225 | old.a = a; | |
1226 | old.b = b; | |
1227 | ||
1228 | bb1: | |
1229 | a' = new->a; | |
1230 | b' = new->b; | |
1231 | while (1) | |
1232 | { | |
1233 | use (a'); | |
1234 | use (b'); | |
1235 | } | |
1236 | ||
1237 | `old' is stored to *ARG_STRUCT and `new' is stored to NEW_ARG_STRUCT. The | |
1238 | pointer `new' is intentionally not initialized (the loop will be split to a | |
1239 | separate function later, and `new' will be initialized from its arguments). | |
a509ebb5 | 1240 | LD_ST_DATA holds information about the shared data structure used to pass |
b8698a0f L |
1241 | information among the threads. It is initialized here, and |
1242 | gen_parallel_loop will pass it to create_call_for_reduction that | |
1243 | needs this information. REDUCTION_LIST describes the reductions | |
a509ebb5 | 1244 | in LOOP. */ |
5f40b3cb ZD |
1245 | |
1246 | static void | |
9f9f72aa | 1247 | separate_decls_in_region (edge entry, edge exit, htab_t reduction_list, |
b8698a0f | 1248 | tree *arg_struct, tree *new_arg_struct, |
9f9f72aa | 1249 | struct clsn_data *ld_st_data) |
a509ebb5 | 1250 | |
5f40b3cb | 1251 | { |
9f9f72aa | 1252 | basic_block bb1 = split_edge (entry); |
5f40b3cb ZD |
1253 | basic_block bb0 = single_pred (bb1); |
1254 | htab_t name_copies = htab_create (10, name_to_copy_elt_hash, | |
1255 | name_to_copy_elt_eq, free); | |
1256 | htab_t decl_copies = htab_create (10, int_tree_map_hash, int_tree_map_eq, | |
1257 | free); | |
5f40b3cb | 1258 | unsigned i; |
726a989a RB |
1259 | tree type, type_name, nvar; |
1260 | gimple_stmt_iterator gsi; | |
5f40b3cb | 1261 | struct clsn_data clsn_data; |
9f9f72aa AP |
1262 | VEC (basic_block, heap) *body = VEC_alloc (basic_block, heap, 3); |
1263 | basic_block bb; | |
1264 | basic_block entry_bb = bb1; | |
1265 | basic_block exit_bb = exit->dest; | |
b5b8b0ac | 1266 | bool has_debug_stmt = false; |
5f40b3cb | 1267 | |
726a989a | 1268 | entry = single_succ_edge (entry_bb); |
9f9f72aa | 1269 | gather_blocks_in_sese_region (entry_bb, exit_bb, &body); |
5f40b3cb | 1270 | |
ac47786e | 1271 | FOR_EACH_VEC_ELT (basic_block, body, i, bb) |
9f9f72aa | 1272 | { |
b8698a0f | 1273 | if (bb != entry_bb && bb != exit_bb) |
9f9f72aa | 1274 | { |
726a989a RB |
1275 | for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
1276 | separate_decls_in_region_stmt (entry, exit, gsi_stmt (gsi), | |
1277 | name_copies, decl_copies); | |
1278 | ||
1279 | for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
b5b8b0ac AO |
1280 | { |
1281 | gimple stmt = gsi_stmt (gsi); | |
1282 | ||
1283 | if (is_gimple_debug (stmt)) | |
1284 | has_debug_stmt = true; | |
1285 | else | |
1286 | separate_decls_in_region_stmt (entry, exit, stmt, | |
1287 | name_copies, decl_copies); | |
1288 | } | |
9f9f72aa | 1289 | } |
5f40b3cb | 1290 | } |
9f9f72aa | 1291 | |
b5b8b0ac AO |
1292 | /* Now process debug bind stmts. We must not create decls while |
1293 | processing debug stmts, so we defer their processing so as to | |
1294 | make sure we will have debug info for as many variables as | |
1295 | possible (all of those that were dealt with in the loop above), | |
1296 | and discard those for which we know there's nothing we can | |
1297 | do. */ | |
1298 | if (has_debug_stmt) | |
ac47786e | 1299 | FOR_EACH_VEC_ELT (basic_block, body, i, bb) |
b5b8b0ac AO |
1300 | if (bb != entry_bb && bb != exit_bb) |
1301 | { | |
1302 | for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi);) | |
1303 | { | |
1304 | gimple stmt = gsi_stmt (gsi); | |
1305 | ||
ddb555ed | 1306 | if (is_gimple_debug (stmt)) |
b5b8b0ac | 1307 | { |
ddb555ed JJ |
1308 | if (separate_decls_in_region_debug (stmt, name_copies, |
1309 | decl_copies)) | |
b5b8b0ac AO |
1310 | { |
1311 | gsi_remove (&gsi, true); | |
1312 | continue; | |
1313 | } | |
1314 | } | |
1315 | ||
1316 | gsi_next (&gsi); | |
1317 | } | |
1318 | } | |
1319 | ||
9f9f72aa | 1320 | VEC_free (basic_block, heap, body); |
5f40b3cb | 1321 | |
b8698a0f | 1322 | if (htab_elements (name_copies) == 0 && htab_elements (reduction_list) == 0) |
5f40b3cb ZD |
1323 | { |
1324 | /* It may happen that there is nothing to copy (if there are only | |
a509ebb5 | 1325 | loop carried and external variables in the loop). */ |
5f40b3cb ZD |
1326 | *arg_struct = NULL; |
1327 | *new_arg_struct = NULL; | |
1328 | } | |
1329 | else | |
1330 | { | |
1331 | /* Create the type for the structure to store the ssa names to. */ | |
1332 | type = lang_hooks.types.make_type (RECORD_TYPE); | |
9ff70652 | 1333 | type_name = build_decl (UNKNOWN_LOCATION, |
c2255bc4 | 1334 | TYPE_DECL, create_tmp_var_name (".paral_data"), |
5f40b3cb ZD |
1335 | type); |
1336 | TYPE_NAME (type) = type_name; | |
1337 | ||
0eb7e7aa | 1338 | htab_traverse (name_copies, add_field_for_name, type); |
9f9f72aa | 1339 | if (reduction_list && htab_elements (reduction_list) > 0) |
0eb7e7aa RL |
1340 | { |
1341 | /* Create the fields for reductions. */ | |
1342 | htab_traverse (reduction_list, add_field_for_reduction, | |
1343 | type); | |
1344 | } | |
5f40b3cb | 1345 | layout_type (type); |
b8698a0f | 1346 | |
5f40b3cb ZD |
1347 | /* Create the loads and stores. */ |
1348 | *arg_struct = create_tmp_var (type, ".paral_data_store"); | |
5f40b3cb | 1349 | nvar = create_tmp_var (build_pointer_type (type), ".paral_data_load"); |
726a989a | 1350 | *new_arg_struct = make_ssa_name (nvar, NULL); |
5f40b3cb | 1351 | |
a509ebb5 RL |
1352 | ld_st_data->store = *arg_struct; |
1353 | ld_st_data->load = *new_arg_struct; | |
1354 | ld_st_data->store_bb = bb0; | |
1355 | ld_st_data->load_bb = bb1; | |
0eb7e7aa | 1356 | |
5f40b3cb | 1357 | htab_traverse (name_copies, create_loads_and_stores_for_name, |
a509ebb5 RL |
1358 | ld_st_data); |
1359 | ||
ae0bce62 RL |
1360 | /* Load the calculation from memory (after the join of the threads). */ |
1361 | ||
9f9f72aa | 1362 | if (reduction_list && htab_elements (reduction_list) > 0) |
a509ebb5 | 1363 | { |
0eb7e7aa | 1364 | htab_traverse (reduction_list, create_stores_for_reduction, |
b8698a0f | 1365 | ld_st_data); |
726a989a | 1366 | clsn_data.load = make_ssa_name (nvar, NULL); |
9f9f72aa | 1367 | clsn_data.load_bb = exit->dest; |
a509ebb5 RL |
1368 | clsn_data.store = ld_st_data->store; |
1369 | create_final_loads_for_reduction (reduction_list, &clsn_data); | |
1370 | } | |
5f40b3cb ZD |
1371 | } |
1372 | ||
1373 | htab_delete (decl_copies); | |
1374 | htab_delete (name_copies); | |
1375 | } | |
1376 | ||
1377 | /* Bitmap containing uids of functions created by parallelization. We cannot | |
1378 | allocate it from the default obstack, as it must live across compilation | |
1379 | of several functions; we make it gc allocated instead. */ | |
1380 | ||
1381 | static GTY(()) bitmap parallelized_functions; | |
1382 | ||
1383 | /* Returns true if FN was created by create_loop_fn. */ | |
1384 | ||
62e0a1ed | 1385 | bool |
5f40b3cb ZD |
1386 | parallelized_function_p (tree fn) |
1387 | { | |
1388 | if (!parallelized_functions || !DECL_ARTIFICIAL (fn)) | |
1389 | return false; | |
1390 | ||
1391 | return bitmap_bit_p (parallelized_functions, DECL_UID (fn)); | |
1392 | } | |
1393 | ||
1394 | /* Creates and returns an empty function that will receive the body of | |
1395 | a parallelized loop. */ | |
1396 | ||
1397 | static tree | |
9ff70652 | 1398 | create_loop_fn (location_t loc) |
5f40b3cb ZD |
1399 | { |
1400 | char buf[100]; | |
1401 | char *tname; | |
1402 | tree decl, type, name, t; | |
1403 | struct function *act_cfun = cfun; | |
1404 | static unsigned loopfn_num; | |
1405 | ||
1406 | snprintf (buf, 100, "%s.$loopfn", current_function_name ()); | |
1407 | ASM_FORMAT_PRIVATE_NAME (tname, buf, loopfn_num++); | |
1408 | clean_symbol_name (tname); | |
1409 | name = get_identifier (tname); | |
1410 | type = build_function_type_list (void_type_node, ptr_type_node, NULL_TREE); | |
1411 | ||
9ff70652 | 1412 | decl = build_decl (loc, FUNCTION_DECL, name, type); |
5f40b3cb ZD |
1413 | if (!parallelized_functions) |
1414 | parallelized_functions = BITMAP_GGC_ALLOC (); | |
1415 | bitmap_set_bit (parallelized_functions, DECL_UID (decl)); | |
1416 | ||
1417 | TREE_STATIC (decl) = 1; | |
1418 | TREE_USED (decl) = 1; | |
1419 | DECL_ARTIFICIAL (decl) = 1; | |
1420 | DECL_IGNORED_P (decl) = 0; | |
1421 | TREE_PUBLIC (decl) = 0; | |
1422 | DECL_UNINLINABLE (decl) = 1; | |
1423 | DECL_EXTERNAL (decl) = 0; | |
1424 | DECL_CONTEXT (decl) = NULL_TREE; | |
1425 | DECL_INITIAL (decl) = make_node (BLOCK); | |
1426 | ||
9ff70652 | 1427 | t = build_decl (loc, RESULT_DECL, NULL_TREE, void_type_node); |
5f40b3cb ZD |
1428 | DECL_ARTIFICIAL (t) = 1; |
1429 | DECL_IGNORED_P (t) = 1; | |
1430 | DECL_RESULT (decl) = t; | |
1431 | ||
9ff70652 | 1432 | t = build_decl (loc, PARM_DECL, get_identifier (".paral_data_param"), |
5f40b3cb ZD |
1433 | ptr_type_node); |
1434 | DECL_ARTIFICIAL (t) = 1; | |
1435 | DECL_ARG_TYPE (t) = ptr_type_node; | |
1436 | DECL_CONTEXT (t) = decl; | |
1437 | TREE_USED (t) = 1; | |
1438 | DECL_ARGUMENTS (decl) = t; | |
1439 | ||
182e0d71 | 1440 | allocate_struct_function (decl, false); |
5f40b3cb ZD |
1441 | |
1442 | /* The call to allocate_struct_function clobbers CFUN, so we need to restore | |
1443 | it. */ | |
5576d6f2 | 1444 | set_cfun (act_cfun); |
5f40b3cb ZD |
1445 | |
1446 | return decl; | |
1447 | } | |
1448 | ||
5f40b3cb ZD |
1449 | /* Moves the exit condition of LOOP to the beginning of its header, and |
1450 | duplicates the part of the last iteration that gets disabled to the | |
1451 | exit of the loop. NIT is the number of iterations of the loop | |
1452 | (used to initialize the variables in the duplicated part). | |
b8698a0f | 1453 | |
fa10beec | 1454 | TODO: the common case is that latch of the loop is empty and immediately |
5f40b3cb ZD |
1455 | follows the loop exit. In this case, it would be better not to copy the |
1456 | body of the loop, but only move the entry of the loop directly before the | |
1457 | exit check and increase the number of iterations of the loop by one. | |
b8698a0f | 1458 | This may need some additional preconditioning in case NIT = ~0. |
a509ebb5 | 1459 | REDUCTION_LIST describes the reductions in LOOP. */ |
5f40b3cb ZD |
1460 | |
1461 | static void | |
a509ebb5 | 1462 | transform_to_exit_first_loop (struct loop *loop, htab_t reduction_list, tree nit) |
5f40b3cb ZD |
1463 | { |
1464 | basic_block *bbs, *nbbs, ex_bb, orig_header; | |
1465 | unsigned n; | |
1466 | bool ok; | |
1467 | edge exit = single_dom_exit (loop), hpred; | |
726a989a | 1468 | tree control, control_name, res, t; |
48710229 | 1469 | gimple phi, nphi, cond_stmt, stmt, cond_nit; |
726a989a | 1470 | gimple_stmt_iterator gsi; |
48710229 | 1471 | tree nit_1; |
5f40b3cb ZD |
1472 | |
1473 | split_block_after_labels (loop->header); | |
1474 | orig_header = single_succ (loop->header); | |
1475 | hpred = single_succ_edge (loop->header); | |
1476 | ||
1477 | cond_stmt = last_stmt (exit->src); | |
726a989a RB |
1478 | control = gimple_cond_lhs (cond_stmt); |
1479 | gcc_assert (gimple_cond_rhs (cond_stmt) == nit); | |
5f40b3cb ZD |
1480 | |
1481 | /* Make sure that we have phi nodes on exit for all loop header phis | |
1482 | (create_parallel_loop requires that). */ | |
726a989a | 1483 | for (gsi = gsi_start_phis (loop->header); !gsi_end_p (gsi); gsi_next (&gsi)) |
5f40b3cb | 1484 | { |
726a989a | 1485 | phi = gsi_stmt (gsi); |
5f40b3cb | 1486 | res = PHI_RESULT (phi); |
070ecdfd | 1487 | t = copy_ssa_name (res, phi); |
5f40b3cb | 1488 | SET_PHI_RESULT (phi, t); |
5f40b3cb | 1489 | nphi = create_phi_node (res, orig_header); |
9e227d60 | 1490 | add_phi_arg (nphi, t, hpred, UNKNOWN_LOCATION); |
5f40b3cb ZD |
1491 | |
1492 | if (res == control) | |
1493 | { | |
726a989a | 1494 | gimple_cond_set_lhs (cond_stmt, t); |
5f40b3cb ZD |
1495 | update_stmt (cond_stmt); |
1496 | control = t; | |
1497 | } | |
1498 | } | |
12037899 | 1499 | |
5f40b3cb | 1500 | bbs = get_loop_body_in_dom_order (loop); |
48710229 | 1501 | |
69958396 RL |
1502 | for (n = 0; bbs[n] != exit->src; n++) |
1503 | continue; | |
5f40b3cb | 1504 | nbbs = XNEWVEC (basic_block, n); |
726a989a RB |
1505 | ok = gimple_duplicate_sese_tail (single_succ_edge (loop->header), exit, |
1506 | bbs + 1, n, nbbs); | |
5f40b3cb ZD |
1507 | gcc_assert (ok); |
1508 | free (bbs); | |
1509 | ex_bb = nbbs[0]; | |
1510 | free (nbbs); | |
1511 | ||
b8698a0f | 1512 | /* Other than reductions, the only gimple reg that should be copied |
726a989a | 1513 | out of the loop is the control variable. */ |
69958396 | 1514 | exit = single_dom_exit (loop); |
5f40b3cb | 1515 | control_name = NULL_TREE; |
726a989a | 1516 | for (gsi = gsi_start_phis (ex_bb); !gsi_end_p (gsi); ) |
5f40b3cb | 1517 | { |
726a989a | 1518 | phi = gsi_stmt (gsi); |
5f40b3cb | 1519 | res = PHI_RESULT (phi); |
ea057359 | 1520 | if (virtual_operand_p (res)) |
726a989a RB |
1521 | { |
1522 | gsi_next (&gsi); | |
1523 | continue; | |
1524 | } | |
5f40b3cb | 1525 | |
a509ebb5 | 1526 | /* Check if it is a part of reduction. If it is, |
b8698a0f L |
1527 | keep the phi at the reduction's keep_res field. The |
1528 | PHI_RESULT of this phi is the resulting value of the reduction | |
a509ebb5 RL |
1529 | variable when exiting the loop. */ |
1530 | ||
b8698a0f | 1531 | if (htab_elements (reduction_list) > 0) |
a509ebb5 RL |
1532 | { |
1533 | struct reduction_info *red; | |
1534 | ||
1535 | tree val = PHI_ARG_DEF_FROM_EDGE (phi, exit); | |
a509ebb5 RL |
1536 | red = reduction_phi (reduction_list, SSA_NAME_DEF_STMT (val)); |
1537 | if (red) | |
726a989a RB |
1538 | { |
1539 | red->keep_res = phi; | |
1540 | gsi_next (&gsi); | |
1541 | continue; | |
1542 | } | |
a509ebb5 | 1543 | } |
726a989a RB |
1544 | gcc_assert (control_name == NULL_TREE |
1545 | && SSA_NAME_VAR (res) == SSA_NAME_VAR (control)); | |
5f40b3cb | 1546 | control_name = res; |
726a989a | 1547 | remove_phi_node (&gsi, false); |
5f40b3cb ZD |
1548 | } |
1549 | gcc_assert (control_name != NULL_TREE); | |
5f40b3cb | 1550 | |
b8698a0f | 1551 | /* Initialize the control variable to number of iterations |
48710229 | 1552 | according to the rhs of the exit condition. */ |
726a989a | 1553 | gsi = gsi_after_labels (ex_bb); |
b8698a0f | 1554 | cond_nit = last_stmt (exit->src); |
48710229 RL |
1555 | nit_1 = gimple_cond_rhs (cond_nit); |
1556 | nit_1 = force_gimple_operand_gsi (&gsi, | |
1557 | fold_convert (TREE_TYPE (control_name), nit_1), | |
726a989a | 1558 | false, NULL_TREE, false, GSI_SAME_STMT); |
48710229 | 1559 | stmt = gimple_build_assign (control_name, nit_1); |
726a989a RB |
1560 | gsi_insert_before (&gsi, stmt, GSI_NEW_STMT); |
1561 | SSA_NAME_DEF_STMT (control_name) = stmt; | |
5f40b3cb ZD |
1562 | } |
1563 | ||
1564 | /* Create the parallel constructs for LOOP as described in gen_parallel_loop. | |
726a989a | 1565 | LOOP_FN and DATA are the arguments of GIMPLE_OMP_PARALLEL. |
5f40b3cb ZD |
1566 | NEW_DATA is the variable that should be initialized from the argument |
1567 | of LOOP_FN. N_THREADS is the requested number of threads. Returns the | |
726a989a | 1568 | basic block containing GIMPLE_OMP_PARALLEL tree. */ |
5f40b3cb ZD |
1569 | |
1570 | static basic_block | |
1571 | create_parallel_loop (struct loop *loop, tree loop_fn, tree data, | |
9ff70652 | 1572 | tree new_data, unsigned n_threads, location_t loc) |
5f40b3cb | 1573 | { |
726a989a | 1574 | gimple_stmt_iterator gsi; |
5f40b3cb | 1575 | basic_block bb, paral_bb, for_bb, ex_bb; |
0f900dfa | 1576 | tree t, param; |
726a989a RB |
1577 | gimple stmt, for_stmt, phi, cond_stmt; |
1578 | tree cvar, cvar_init, initvar, cvar_next, cvar_base, type; | |
5f40b3cb ZD |
1579 | edge exit, nexit, guard, end, e; |
1580 | ||
726a989a | 1581 | /* Prepare the GIMPLE_OMP_PARALLEL statement. */ |
5f40b3cb ZD |
1582 | bb = loop_preheader_edge (loop)->src; |
1583 | paral_bb = single_pred (bb); | |
726a989a | 1584 | gsi = gsi_last_bb (paral_bb); |
5f40b3cb | 1585 | |
9ff70652 | 1586 | t = build_omp_clause (loc, OMP_CLAUSE_NUM_THREADS); |
5f40b3cb | 1587 | OMP_CLAUSE_NUM_THREADS_EXPR (t) |
a509ebb5 | 1588 | = build_int_cst (integer_type_node, n_threads); |
726a989a | 1589 | stmt = gimple_build_omp_parallel (NULL, t, loop_fn, data); |
9ff70652 | 1590 | gimple_set_location (stmt, loc); |
5f40b3cb | 1591 | |
726a989a | 1592 | gsi_insert_after (&gsi, stmt, GSI_NEW_STMT); |
5f40b3cb ZD |
1593 | |
1594 | /* Initialize NEW_DATA. */ | |
1595 | if (data) | |
1596 | { | |
726a989a RB |
1597 | gsi = gsi_after_labels (bb); |
1598 | ||
1599 | param = make_ssa_name (DECL_ARGUMENTS (loop_fn), NULL); | |
1600 | stmt = gimple_build_assign (param, build_fold_addr_expr (data)); | |
1601 | gsi_insert_before (&gsi, stmt, GSI_SAME_STMT); | |
1602 | SSA_NAME_DEF_STMT (param) = stmt; | |
1603 | ||
1604 | stmt = gimple_build_assign (new_data, | |
1605 | fold_convert (TREE_TYPE (new_data), param)); | |
1606 | gsi_insert_before (&gsi, stmt, GSI_SAME_STMT); | |
1607 | SSA_NAME_DEF_STMT (new_data) = stmt; | |
5f40b3cb ZD |
1608 | } |
1609 | ||
726a989a | 1610 | /* Emit GIMPLE_OMP_RETURN for GIMPLE_OMP_PARALLEL. */ |
5f40b3cb | 1611 | bb = split_loop_exit_edge (single_dom_exit (loop)); |
726a989a | 1612 | gsi = gsi_last_bb (bb); |
9ff70652 JJ |
1613 | stmt = gimple_build_omp_return (false); |
1614 | gimple_set_location (stmt, loc); | |
1615 | gsi_insert_after (&gsi, stmt, GSI_NEW_STMT); | |
5f40b3cb | 1616 | |
726a989a | 1617 | /* Extract data for GIMPLE_OMP_FOR. */ |
5f40b3cb | 1618 | gcc_assert (loop->header == single_dom_exit (loop)->src); |
726a989a | 1619 | cond_stmt = last_stmt (loop->header); |
5f40b3cb | 1620 | |
726a989a | 1621 | cvar = gimple_cond_lhs (cond_stmt); |
5f40b3cb ZD |
1622 | cvar_base = SSA_NAME_VAR (cvar); |
1623 | phi = SSA_NAME_DEF_STMT (cvar); | |
1624 | cvar_init = PHI_ARG_DEF_FROM_EDGE (phi, loop_preheader_edge (loop)); | |
070ecdfd | 1625 | initvar = copy_ssa_name (cvar, NULL); |
5f40b3cb ZD |
1626 | SET_USE (PHI_ARG_DEF_PTR_FROM_EDGE (phi, loop_preheader_edge (loop)), |
1627 | initvar); | |
1628 | cvar_next = PHI_ARG_DEF_FROM_EDGE (phi, loop_latch_edge (loop)); | |
1629 | ||
1dff453d | 1630 | gsi = gsi_last_nondebug_bb (loop->latch); |
726a989a RB |
1631 | gcc_assert (gsi_stmt (gsi) == SSA_NAME_DEF_STMT (cvar_next)); |
1632 | gsi_remove (&gsi, true); | |
5f40b3cb ZD |
1633 | |
1634 | /* Prepare cfg. */ | |
1635 | for_bb = split_edge (loop_preheader_edge (loop)); | |
1636 | ex_bb = split_loop_exit_edge (single_dom_exit (loop)); | |
1637 | extract_true_false_edges_from_block (loop->header, &nexit, &exit); | |
1638 | gcc_assert (exit == single_dom_exit (loop)); | |
1639 | ||
1640 | guard = make_edge (for_bb, ex_bb, 0); | |
1641 | single_succ_edge (loop->latch)->flags = 0; | |
1642 | end = make_edge (loop->latch, ex_bb, EDGE_FALLTHRU); | |
726a989a | 1643 | for (gsi = gsi_start_phis (ex_bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
5f40b3cb | 1644 | { |
f5045c96 AM |
1645 | source_location locus; |
1646 | tree def; | |
726a989a | 1647 | phi = gsi_stmt (gsi); |
726a989a | 1648 | stmt = SSA_NAME_DEF_STMT (PHI_ARG_DEF_FROM_EDGE (phi, exit)); |
f5045c96 AM |
1649 | |
1650 | def = PHI_ARG_DEF_FROM_EDGE (stmt, loop_preheader_edge (loop)); | |
b8698a0f | 1651 | locus = gimple_phi_arg_location_from_edge (stmt, |
f5045c96 | 1652 | loop_preheader_edge (loop)); |
9e227d60 | 1653 | add_phi_arg (phi, def, guard, locus); |
f5045c96 AM |
1654 | |
1655 | def = PHI_ARG_DEF_FROM_EDGE (stmt, loop_latch_edge (loop)); | |
1656 | locus = gimple_phi_arg_location_from_edge (stmt, loop_latch_edge (loop)); | |
9e227d60 | 1657 | add_phi_arg (phi, def, end, locus); |
5f40b3cb ZD |
1658 | } |
1659 | e = redirect_edge_and_branch (exit, nexit->dest); | |
1660 | PENDING_STMT (e) = NULL; | |
1661 | ||
726a989a RB |
1662 | /* Emit GIMPLE_OMP_FOR. */ |
1663 | gimple_cond_set_lhs (cond_stmt, cvar_base); | |
5f40b3cb | 1664 | type = TREE_TYPE (cvar); |
9ff70652 | 1665 | t = build_omp_clause (loc, OMP_CLAUSE_SCHEDULE); |
5f40b3cb ZD |
1666 | OMP_CLAUSE_SCHEDULE_KIND (t) = OMP_CLAUSE_SCHEDULE_STATIC; |
1667 | ||
726a989a | 1668 | for_stmt = gimple_build_omp_for (NULL, t, 1, NULL); |
9ff70652 | 1669 | gimple_set_location (for_stmt, loc); |
726a989a RB |
1670 | gimple_omp_for_set_index (for_stmt, 0, initvar); |
1671 | gimple_omp_for_set_initial (for_stmt, 0, cvar_init); | |
1672 | gimple_omp_for_set_final (for_stmt, 0, gimple_cond_rhs (cond_stmt)); | |
1673 | gimple_omp_for_set_cond (for_stmt, 0, gimple_cond_code (cond_stmt)); | |
1674 | gimple_omp_for_set_incr (for_stmt, 0, build2 (PLUS_EXPR, type, | |
1675 | cvar_base, | |
1676 | build_int_cst (type, 1))); | |
1677 | ||
1678 | gsi = gsi_last_bb (for_bb); | |
1679 | gsi_insert_after (&gsi, for_stmt, GSI_NEW_STMT); | |
5f40b3cb ZD |
1680 | SSA_NAME_DEF_STMT (initvar) = for_stmt; |
1681 | ||
726a989a RB |
1682 | /* Emit GIMPLE_OMP_CONTINUE. */ |
1683 | gsi = gsi_last_bb (loop->latch); | |
1684 | stmt = gimple_build_omp_continue (cvar_next, cvar); | |
9ff70652 | 1685 | gimple_set_location (stmt, loc); |
726a989a RB |
1686 | gsi_insert_after (&gsi, stmt, GSI_NEW_STMT); |
1687 | SSA_NAME_DEF_STMT (cvar_next) = stmt; | |
5f40b3cb | 1688 | |
726a989a RB |
1689 | /* Emit GIMPLE_OMP_RETURN for GIMPLE_OMP_FOR. */ |
1690 | gsi = gsi_last_bb (ex_bb); | |
9ff70652 JJ |
1691 | stmt = gimple_build_omp_return (true); |
1692 | gimple_set_location (stmt, loc); | |
1693 | gsi_insert_after (&gsi, stmt, GSI_NEW_STMT); | |
5f40b3cb | 1694 | |
cd7d9fd7 RG |
1695 | /* After the above dom info is hosed. Re-compute it. */ |
1696 | free_dominance_info (CDI_DOMINATORS); | |
1697 | calculate_dominance_info (CDI_DOMINATORS); | |
1698 | ||
5f40b3cb ZD |
1699 | return paral_bb; |
1700 | } | |
1701 | ||
08dab97a RL |
1702 | /* Generates code to execute the iterations of LOOP in N_THREADS |
1703 | threads in parallel. | |
1704 | ||
1705 | NITER describes number of iterations of LOOP. | |
fa10beec | 1706 | REDUCTION_LIST describes the reductions existent in the LOOP. */ |
5f40b3cb ZD |
1707 | |
1708 | static void | |
08dab97a | 1709 | gen_parallel_loop (struct loop *loop, htab_t reduction_list, |
a509ebb5 | 1710 | unsigned n_threads, struct tree_niter_desc *niter) |
5f40b3cb | 1711 | { |
9326236d | 1712 | loop_iterator li; |
5f40b3cb | 1713 | tree many_iterations_cond, type, nit; |
726a989a RB |
1714 | tree arg_struct, new_arg_struct; |
1715 | gimple_seq stmts; | |
5f40b3cb | 1716 | basic_block parallel_head; |
9f9f72aa | 1717 | edge entry, exit; |
a509ebb5 | 1718 | struct clsn_data clsn_data; |
5f40b3cb | 1719 | unsigned prob; |
9ff70652 JJ |
1720 | location_t loc; |
1721 | gimple cond_stmt; | |
768da0da | 1722 | unsigned int m_p_thread=2; |
5f40b3cb ZD |
1723 | |
1724 | /* From | |
1725 | ||
1726 | --------------------------------------------------------------------- | |
1727 | loop | |
1728 | { | |
1729 | IV = phi (INIT, IV + STEP) | |
1730 | BODY1; | |
1731 | if (COND) | |
1732 | break; | |
1733 | BODY2; | |
1734 | } | |
1735 | --------------------------------------------------------------------- | |
1736 | ||
1737 | with # of iterations NITER (possibly with MAY_BE_ZERO assumption), | |
1738 | we generate the following code: | |
1739 | ||
1740 | --------------------------------------------------------------------- | |
1741 | ||
1742 | if (MAY_BE_ZERO | |
a509ebb5 RL |
1743 | || NITER < MIN_PER_THREAD * N_THREADS) |
1744 | goto original; | |
5f40b3cb ZD |
1745 | |
1746 | BODY1; | |
1747 | store all local loop-invariant variables used in body of the loop to DATA. | |
726a989a | 1748 | GIMPLE_OMP_PARALLEL (OMP_CLAUSE_NUM_THREADS (N_THREADS), LOOPFN, DATA); |
5f40b3cb | 1749 | load the variables from DATA. |
726a989a | 1750 | GIMPLE_OMP_FOR (IV = INIT; COND; IV += STEP) (OMP_CLAUSE_SCHEDULE (static)) |
5f40b3cb ZD |
1751 | BODY2; |
1752 | BODY1; | |
726a989a RB |
1753 | GIMPLE_OMP_CONTINUE; |
1754 | GIMPLE_OMP_RETURN -- GIMPLE_OMP_FOR | |
1755 | GIMPLE_OMP_RETURN -- GIMPLE_OMP_PARALLEL | |
5f40b3cb ZD |
1756 | goto end; |
1757 | ||
1758 | original: | |
1759 | loop | |
1760 | { | |
1761 | IV = phi (INIT, IV + STEP) | |
1762 | BODY1; | |
1763 | if (COND) | |
1764 | break; | |
1765 | BODY2; | |
1766 | } | |
1767 | ||
1768 | end: | |
1769 | ||
1770 | */ | |
1771 | ||
1772 | /* Create two versions of the loop -- in the old one, we know that the | |
1773 | number of iterations is large enough, and we will transform it into the | |
1774 | loop that will be split to loop_fn, the new one will be used for the | |
1775 | remaining iterations. */ | |
a509ebb5 | 1776 | |
768da0da RL |
1777 | /* We should compute a better number-of-iterations value for outer loops. |
1778 | That is, if we have | |
1779 | ||
1780 | for (i = 0; i < n; ++i) | |
1781 | for (j = 0; j < m; ++j) | |
1782 | ... | |
1783 | ||
1784 | we should compute nit = n * m, not nit = n. | |
1785 | Also may_be_zero handling would need to be adjusted. */ | |
1786 | ||
5f40b3cb ZD |
1787 | type = TREE_TYPE (niter->niter); |
1788 | nit = force_gimple_operand (unshare_expr (niter->niter), &stmts, true, | |
1789 | NULL_TREE); | |
1790 | if (stmts) | |
726a989a | 1791 | gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); |
5f40b3cb | 1792 | |
768da0da RL |
1793 | if (loop->inner) |
1794 | m_p_thread=2; | |
1795 | else | |
1796 | m_p_thread=MIN_PER_THREAD; | |
1797 | ||
1798 | many_iterations_cond = | |
1799 | fold_build2 (GE_EXPR, boolean_type_node, | |
1800 | nit, build_int_cst (type, m_p_thread * n_threads)); | |
1801 | ||
5f40b3cb | 1802 | many_iterations_cond |
a509ebb5 RL |
1803 | = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, |
1804 | invert_truthvalue (unshare_expr (niter->may_be_zero)), | |
1805 | many_iterations_cond); | |
5f40b3cb | 1806 | many_iterations_cond |
a509ebb5 | 1807 | = force_gimple_operand (many_iterations_cond, &stmts, false, NULL_TREE); |
5f40b3cb | 1808 | if (stmts) |
726a989a | 1809 | gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); |
5f40b3cb ZD |
1810 | if (!is_gimple_condexpr (many_iterations_cond)) |
1811 | { | |
1812 | many_iterations_cond | |
a509ebb5 RL |
1813 | = force_gimple_operand (many_iterations_cond, &stmts, |
1814 | true, NULL_TREE); | |
5f40b3cb | 1815 | if (stmts) |
726a989a | 1816 | gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); |
5f40b3cb ZD |
1817 | } |
1818 | ||
1819 | initialize_original_copy_tables (); | |
1820 | ||
1821 | /* We assume that the loop usually iterates a lot. */ | |
1822 | prob = 4 * REG_BR_PROB_BASE / 5; | |
0f900dfa JJ |
1823 | loop_version (loop, many_iterations_cond, NULL, |
1824 | prob, prob, REG_BR_PROB_BASE - prob, true); | |
5f40b3cb ZD |
1825 | update_ssa (TODO_update_ssa); |
1826 | free_original_copy_tables (); | |
1827 | ||
1828 | /* Base all the induction variables in LOOP on a single control one. */ | |
c80a5403 | 1829 | canonicalize_loop_ivs (loop, &nit, true); |
5f40b3cb ZD |
1830 | |
1831 | /* Ensure that the exit condition is the first statement in the loop. */ | |
a509ebb5 RL |
1832 | transform_to_exit_first_loop (loop, reduction_list, nit); |
1833 | ||
fa10beec | 1834 | /* Generate initializations for reductions. */ |
b8698a0f | 1835 | if (htab_elements (reduction_list) > 0) |
a509ebb5 | 1836 | htab_traverse (reduction_list, initialize_reductions, loop); |
5f40b3cb ZD |
1837 | |
1838 | /* Eliminate the references to local variables from the loop. */ | |
9f9f72aa AP |
1839 | gcc_assert (single_exit (loop)); |
1840 | entry = loop_preheader_edge (loop); | |
1841 | exit = single_dom_exit (loop); | |
5f40b3cb | 1842 | |
9f9f72aa | 1843 | eliminate_local_variables (entry, exit); |
5f40b3cb ZD |
1844 | /* In the old loop, move all variables non-local to the loop to a structure |
1845 | and back, and create separate decls for the variables used in loop. */ | |
b8698a0f | 1846 | separate_decls_in_region (entry, exit, reduction_list, &arg_struct, |
9f9f72aa | 1847 | &new_arg_struct, &clsn_data); |
5f40b3cb ZD |
1848 | |
1849 | /* Create the parallel constructs. */ | |
9ff70652 JJ |
1850 | loc = UNKNOWN_LOCATION; |
1851 | cond_stmt = last_stmt (loop->header); | |
1852 | if (cond_stmt) | |
1853 | loc = gimple_location (cond_stmt); | |
1854 | parallel_head = create_parallel_loop (loop, create_loop_fn (loc), arg_struct, | |
1855 | new_arg_struct, n_threads, loc); | |
b8698a0f | 1856 | if (htab_elements (reduction_list) > 0) |
a509ebb5 | 1857 | create_call_for_reduction (loop, reduction_list, &clsn_data); |
5f40b3cb ZD |
1858 | |
1859 | scev_reset (); | |
1860 | ||
1861 | /* Cancel the loop (it is simpler to do it here rather than to teach the | |
1862 | expander to do it). */ | |
1863 | cancel_loop_tree (loop); | |
1864 | ||
92a6bdbd SP |
1865 | /* Free loop bound estimations that could contain references to |
1866 | removed statements. */ | |
1867 | FOR_EACH_LOOP (li, loop, 0) | |
1868 | free_numbers_of_iterations_estimates_loop (loop); | |
1869 | ||
5f40b3cb ZD |
1870 | /* Expand the parallel constructs. We do it directly here instead of running |
1871 | a separate expand_omp pass, since it is more efficient, and less likely to | |
1872 | cause troubles with further analyses not being able to deal with the | |
1873 | OMP trees. */ | |
a509ebb5 | 1874 | |
5f40b3cb ZD |
1875 | omp_expand_local (parallel_head); |
1876 | } | |
1877 | ||
9857228c SP |
1878 | /* Returns true when LOOP contains vector phi nodes. */ |
1879 | ||
1880 | static bool | |
726a989a | 1881 | loop_has_vector_phi_nodes (struct loop *loop ATTRIBUTE_UNUSED) |
9857228c SP |
1882 | { |
1883 | unsigned i; | |
1884 | basic_block *bbs = get_loop_body_in_dom_order (loop); | |
726a989a | 1885 | gimple_stmt_iterator gsi; |
9857228c | 1886 | bool res = true; |
9857228c SP |
1887 | |
1888 | for (i = 0; i < loop->num_nodes; i++) | |
726a989a RB |
1889 | for (gsi = gsi_start_phis (bbs[i]); !gsi_end_p (gsi); gsi_next (&gsi)) |
1890 | if (TREE_CODE (TREE_TYPE (PHI_RESULT (gsi_stmt (gsi)))) == VECTOR_TYPE) | |
9857228c SP |
1891 | goto end; |
1892 | ||
1893 | res = false; | |
1894 | end: | |
1895 | free (bbs); | |
1896 | return res; | |
1897 | } | |
1898 | ||
08dab97a RL |
1899 | /* Create a reduction_info struct, initialize it with REDUC_STMT |
1900 | and PHI, insert it to the REDUCTION_LIST. */ | |
1901 | ||
1902 | static void | |
1903 | build_new_reduction (htab_t reduction_list, gimple reduc_stmt, gimple phi) | |
1904 | { | |
1905 | PTR *slot; | |
1906 | struct reduction_info *new_reduction; | |
1907 | ||
1908 | gcc_assert (reduc_stmt); | |
b8698a0f | 1909 | |
08dab97a RL |
1910 | if (dump_file && (dump_flags & TDF_DETAILS)) |
1911 | { | |
1912 | fprintf (dump_file, | |
1913 | "Detected reduction. reduction stmt is: \n"); | |
1914 | print_gimple_stmt (dump_file, reduc_stmt, 0, 0); | |
1915 | fprintf (dump_file, "\n"); | |
1916 | } | |
b8698a0f | 1917 | |
08dab97a | 1918 | new_reduction = XCNEW (struct reduction_info); |
b8698a0f | 1919 | |
08dab97a RL |
1920 | new_reduction->reduc_stmt = reduc_stmt; |
1921 | new_reduction->reduc_phi = phi; | |
5d1fd1de | 1922 | new_reduction->reduc_version = SSA_NAME_VERSION (gimple_phi_result (phi)); |
08dab97a RL |
1923 | new_reduction->reduction_code = gimple_assign_rhs_code (reduc_stmt); |
1924 | slot = htab_find_slot (reduction_list, new_reduction, INSERT); | |
1925 | *slot = new_reduction; | |
1926 | } | |
1927 | ||
5d1fd1de JJ |
1928 | /* Callback for htab_traverse. Sets gimple_uid of reduc_phi stmts. */ |
1929 | ||
1930 | static int | |
1931 | set_reduc_phi_uids (void **slot, void *data ATTRIBUTE_UNUSED) | |
1932 | { | |
1933 | struct reduction_info *const red = (struct reduction_info *) *slot; | |
1934 | gimple_set_uid (red->reduc_phi, red->reduc_version); | |
1935 | return 1; | |
1936 | } | |
1937 | ||
08dab97a RL |
1938 | /* Detect all reductions in the LOOP, insert them into REDUCTION_LIST. */ |
1939 | ||
1940 | static void | |
1941 | gather_scalar_reductions (loop_p loop, htab_t reduction_list) | |
1942 | { | |
1943 | gimple_stmt_iterator gsi; | |
1944 | loop_vec_info simple_loop_info; | |
1945 | ||
1946 | vect_dump = NULL; | |
1947 | simple_loop_info = vect_analyze_loop_form (loop); | |
1948 | ||
1949 | for (gsi = gsi_start_phis (loop->header); !gsi_end_p (gsi); gsi_next (&gsi)) | |
1950 | { | |
1951 | gimple phi = gsi_stmt (gsi); | |
1952 | affine_iv iv; | |
1953 | tree res = PHI_RESULT (phi); | |
1954 | bool double_reduc; | |
1955 | ||
ea057359 | 1956 | if (virtual_operand_p (res)) |
08dab97a RL |
1957 | continue; |
1958 | ||
1959 | if (!simple_iv (loop, loop, res, &iv, true) | |
1960 | && simple_loop_info) | |
1961 | { | |
8a9ecffd MM |
1962 | gimple reduc_stmt = vect_force_simple_reduction (simple_loop_info, |
1963 | phi, true, | |
1964 | &double_reduc); | |
48710229 | 1965 | if (reduc_stmt && !double_reduc) |
08dab97a RL |
1966 | build_new_reduction (reduction_list, reduc_stmt, phi); |
1967 | } | |
1968 | } | |
5d1fd1de JJ |
1969 | destroy_loop_vec_info (simple_loop_info, true); |
1970 | ||
1971 | /* As gimple_uid is used by the vectorizer in between vect_analyze_loop_form | |
1972 | and destroy_loop_vec_info, we can set gimple_uid of reduc_phi stmts | |
1973 | only now. */ | |
1974 | htab_traverse (reduction_list, set_reduc_phi_uids, NULL); | |
08dab97a RL |
1975 | } |
1976 | ||
1977 | /* Try to initialize NITER for code generation part. */ | |
1978 | ||
1979 | static bool | |
1980 | try_get_loop_niter (loop_p loop, struct tree_niter_desc *niter) | |
1981 | { | |
1982 | edge exit = single_dom_exit (loop); | |
1983 | ||
1984 | gcc_assert (exit); | |
1985 | ||
1986 | /* We need to know # of iterations, and there should be no uses of values | |
1987 | defined inside loop outside of it, unless the values are invariants of | |
1988 | the loop. */ | |
1989 | if (!number_of_iterations_exit (loop, exit, niter, false)) | |
1990 | { | |
1991 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
1992 | fprintf (dump_file, " FAILED: number of iterations not known\n"); | |
1993 | return false; | |
1994 | } | |
1995 | ||
1996 | return true; | |
1997 | } | |
1998 | ||
1999 | /* Try to initialize REDUCTION_LIST for code generation part. | |
2000 | REDUCTION_LIST describes the reductions. */ | |
2001 | ||
2002 | static bool | |
2003 | try_create_reduction_list (loop_p loop, htab_t reduction_list) | |
2004 | { | |
2005 | edge exit = single_dom_exit (loop); | |
2006 | gimple_stmt_iterator gsi; | |
2007 | ||
2008 | gcc_assert (exit); | |
2009 | ||
2010 | gather_scalar_reductions (loop, reduction_list); | |
2011 | ||
b8698a0f | 2012 | |
08dab97a RL |
2013 | for (gsi = gsi_start_phis (exit->dest); !gsi_end_p (gsi); gsi_next (&gsi)) |
2014 | { | |
2015 | gimple phi = gsi_stmt (gsi); | |
2016 | struct reduction_info *red; | |
2017 | imm_use_iterator imm_iter; | |
2018 | use_operand_p use_p; | |
2019 | gimple reduc_phi; | |
2020 | tree val = PHI_ARG_DEF_FROM_EDGE (phi, exit); | |
2021 | ||
ea057359 | 2022 | if (!virtual_operand_p (val)) |
08dab97a RL |
2023 | { |
2024 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
2025 | { | |
2026 | fprintf (dump_file, "phi is "); | |
2027 | print_gimple_stmt (dump_file, phi, 0, 0); | |
2028 | fprintf (dump_file, "arg of phi to exit: value "); | |
2029 | print_generic_expr (dump_file, val, 0); | |
2030 | fprintf (dump_file, " used outside loop\n"); | |
2031 | fprintf (dump_file, | |
2032 | " checking if it a part of reduction pattern: \n"); | |
2033 | } | |
2034 | if (htab_elements (reduction_list) == 0) | |
2035 | { | |
2036 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
2037 | fprintf (dump_file, | |
2038 | " FAILED: it is not a part of reduction.\n"); | |
2039 | return false; | |
2040 | } | |
2041 | reduc_phi = NULL; | |
2042 | FOR_EACH_IMM_USE_FAST (use_p, imm_iter, val) | |
2043 | { | |
4942af9b JJ |
2044 | if (!gimple_debug_bind_p (USE_STMT (use_p)) |
2045 | && flow_bb_inside_loop_p (loop, gimple_bb (USE_STMT (use_p)))) | |
08dab97a RL |
2046 | { |
2047 | reduc_phi = USE_STMT (use_p); | |
2048 | break; | |
2049 | } | |
2050 | } | |
2051 | red = reduction_phi (reduction_list, reduc_phi); | |
2052 | if (red == NULL) | |
2053 | { | |
2054 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
2055 | fprintf (dump_file, | |
2056 | " FAILED: it is not a part of reduction.\n"); | |
2057 | return false; | |
2058 | } | |
2059 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
2060 | { | |
2061 | fprintf (dump_file, "reduction phi is "); | |
2062 | print_gimple_stmt (dump_file, red->reduc_phi, 0, 0); | |
2063 | fprintf (dump_file, "reduction stmt is "); | |
2064 | print_gimple_stmt (dump_file, red->reduc_stmt, 0, 0); | |
2065 | } | |
2066 | } | |
2067 | } | |
2068 | ||
2069 | /* The iterations of the loop may communicate only through bivs whose | |
2070 | iteration space can be distributed efficiently. */ | |
2071 | for (gsi = gsi_start_phis (loop->header); !gsi_end_p (gsi); gsi_next (&gsi)) | |
2072 | { | |
2073 | gimple phi = gsi_stmt (gsi); | |
2074 | tree def = PHI_RESULT (phi); | |
2075 | affine_iv iv; | |
2076 | ||
ea057359 | 2077 | if (!virtual_operand_p (def) && !simple_iv (loop, loop, def, &iv, true)) |
08dab97a RL |
2078 | { |
2079 | struct reduction_info *red; | |
2080 | ||
2081 | red = reduction_phi (reduction_list, phi); | |
2082 | if (red == NULL) | |
2083 | { | |
2084 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
2085 | fprintf (dump_file, | |
2086 | " FAILED: scalar dependency between iterations\n"); | |
2087 | return false; | |
2088 | } | |
2089 | } | |
2090 | } | |
2091 | ||
2092 | ||
2093 | return true; | |
2094 | } | |
2095 | ||
5f40b3cb ZD |
2096 | /* Detect parallel loops and generate parallel code using libgomp |
2097 | primitives. Returns true if some loop was parallelized, false | |
2098 | otherwise. */ | |
2099 | ||
2100 | bool | |
2101 | parallelize_loops (void) | |
2102 | { | |
2103 | unsigned n_threads = flag_tree_parallelize_loops; | |
2104 | bool changed = false; | |
2105 | struct loop *loop; | |
2106 | struct tree_niter_desc niter_desc; | |
2107 | loop_iterator li; | |
a509ebb5 | 2108 | htab_t reduction_list; |
f873b205 | 2109 | struct obstack parloop_obstack; |
8adfe01d RL |
2110 | HOST_WIDE_INT estimated; |
2111 | LOC loop_loc; | |
f873b205 | 2112 | |
5f40b3cb ZD |
2113 | /* Do not parallelize loops in the functions created by parallelization. */ |
2114 | if (parallelized_function_p (cfun->decl)) | |
2115 | return false; | |
8adfe01d RL |
2116 | if (cfun->has_nonlocal_label) |
2117 | return false; | |
5f40b3cb | 2118 | |
f873b205 | 2119 | gcc_obstack_init (&parloop_obstack); |
a509ebb5 | 2120 | reduction_list = htab_create (10, reduction_info_hash, |
08dab97a | 2121 | reduction_info_eq, free); |
726a989a | 2122 | init_stmt_vec_info_vec (); |
a509ebb5 | 2123 | |
5f40b3cb ZD |
2124 | FOR_EACH_LOOP (li, loop, 0) |
2125 | { | |
a509ebb5 | 2126 | htab_empty (reduction_list); |
48710229 RL |
2127 | if (dump_file && (dump_flags & TDF_DETAILS)) |
2128 | { | |
2129 | fprintf (dump_file, "Trying loop %d as candidate\n",loop->num); | |
2130 | if (loop->inner) | |
2131 | fprintf (dump_file, "loop %d is not innermost\n",loop->num); | |
2132 | else | |
2133 | fprintf (dump_file, "loop %d is innermost\n",loop->num); | |
2134 | } | |
b8698a0f | 2135 | |
48710229 | 2136 | /* If we use autopar in graphite pass, we use its marked dependency |
87d4d0ee SP |
2137 | checking results. */ |
2138 | if (flag_loop_parallelize_all && !loop->can_be_parallel) | |
48710229 RL |
2139 | { |
2140 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
2141 | fprintf (dump_file, "loop is not parallel according to graphite\n"); | |
87d4d0ee | 2142 | continue; |
48710229 | 2143 | } |
87d4d0ee | 2144 | |
48710229 RL |
2145 | if (!single_dom_exit (loop)) |
2146 | { | |
b8698a0f | 2147 | |
48710229 RL |
2148 | if (dump_file && (dump_flags & TDF_DETAILS)) |
2149 | fprintf (dump_file, "loop is !single_dom_exit\n"); | |
b8698a0f | 2150 | |
08dab97a | 2151 | continue; |
48710229 | 2152 | } |
08dab97a RL |
2153 | |
2154 | if (/* And of course, the loop must be parallelizable. */ | |
2155 | !can_duplicate_loop_p (loop) | |
1d4af1e8 | 2156 | || loop_has_blocks_with_irreducible_flag (loop) |
8adfe01d | 2157 | || (loop_preheader_edge (loop)->src->flags & BB_IRREDUCIBLE_LOOP) |
9857228c | 2158 | /* FIXME: the check for vector phi nodes could be removed. */ |
69958396 | 2159 | || loop_has_vector_phi_nodes (loop)) |
08dab97a | 2160 | continue; |
e5b332cd | 2161 | |
652c4c71 | 2162 | estimated = estimated_stmt_executions_int (loop); |
e5b332cd RG |
2163 | if (estimated == -1) |
2164 | estimated = max_stmt_executions_int (loop); | |
87d4d0ee | 2165 | /* FIXME: Bypass this check as graphite doesn't update the |
e5b332cd | 2166 | count and frequency correctly now. */ |
87d4d0ee | 2167 | if (!flag_loop_parallelize_all |
e5b332cd RG |
2168 | && ((estimated != -1 |
2169 | && estimated <= (HOST_WIDE_INT) n_threads * MIN_PER_THREAD) | |
87d4d0ee SP |
2170 | /* Do not bother with loops in cold areas. */ |
2171 | || optimize_loop_nest_for_size_p (loop))) | |
08dab97a | 2172 | continue; |
b8698a0f | 2173 | |
08dab97a RL |
2174 | if (!try_get_loop_niter (loop, &niter_desc)) |
2175 | continue; | |
2176 | ||
2177 | if (!try_create_reduction_list (loop, reduction_list)) | |
2178 | continue; | |
2179 | ||
f873b205 LB |
2180 | if (!flag_loop_parallelize_all |
2181 | && !loop_parallel_p (loop, &parloop_obstack)) | |
5f40b3cb ZD |
2182 | continue; |
2183 | ||
2184 | changed = true; | |
48710229 RL |
2185 | if (dump_file && (dump_flags & TDF_DETAILS)) |
2186 | { | |
48710229 | 2187 | if (loop->inner) |
8adfe01d | 2188 | fprintf (dump_file, "parallelizing outer loop %d\n",loop->header->index); |
48710229 | 2189 | else |
8adfe01d RL |
2190 | fprintf (dump_file, "parallelizing inner loop %d\n",loop->header->index); |
2191 | loop_loc = find_loop_location (loop); | |
2192 | if (loop_loc != UNKNOWN_LOC) | |
2193 | fprintf (dump_file, "\nloop at %s:%d: ", | |
2194 | LOC_FILE (loop_loc), LOC_LINE (loop_loc)); | |
b8698a0f L |
2195 | } |
2196 | gen_parallel_loop (loop, reduction_list, | |
08dab97a | 2197 | n_threads, &niter_desc); |
510dbcce | 2198 | #ifdef ENABLE_CHECKING |
5f40b3cb | 2199 | verify_flow_info (); |
5f40b3cb | 2200 | verify_loop_structure (); |
a3b9e73c | 2201 | verify_loop_closed_ssa (true); |
510dbcce | 2202 | #endif |
5f40b3cb ZD |
2203 | } |
2204 | ||
726a989a | 2205 | free_stmt_vec_info_vec (); |
a509ebb5 | 2206 | htab_delete (reduction_list); |
f873b205 | 2207 | obstack_free (&parloop_obstack, NULL); |
6b8ed145 RG |
2208 | |
2209 | /* Parallelization will cause new function calls to be inserted through | |
d086d311 RG |
2210 | which local variables will escape. Reset the points-to solution |
2211 | for ESCAPED. */ | |
6b8ed145 | 2212 | if (changed) |
d086d311 | 2213 | pt_solution_reset (&cfun->gimple_df->escaped); |
6b8ed145 | 2214 | |
5f40b3cb ZD |
2215 | return changed; |
2216 | } | |
2217 | ||
2218 | #include "gt-tree-parloops.h" |