extract_affine_from_call: extract out is_affine_builtin
[pet.git] / skip.c
blob92acf3457e89b0230f5c4cc089477fff25400a0c
1 #include "expr.h"
2 #include "loc.h"
3 #include "scop.h"
4 #include "skip.h"
5 #include "tree.h"
7 /* Do we need to construct a skip condition of the given type
8 * on an if statement, given that the if condition is non-affine?
10 * pet_scop_filter_skip can only handle the case where the if condition
11 * holds (the then branch) and the skip condition is universal.
12 * In any other case, we need to construct a new skip condition.
14 static int if_need_skip_non(struct pet_scop *scop_then,
15 struct pet_scop *scop_else, int have_else, enum pet_skip type)
17 if (have_else && scop_else && pet_scop_has_skip(scop_else, type))
18 return 1;
19 if (scop_then && pet_scop_has_skip(scop_then, type) &&
20 !pet_scop_has_universal_skip(scop_then, type))
21 return 1;
22 return 0;
25 /* Do we need to construct a skip condition of the given type
26 * on an if statement, given that the if condition is affine?
28 * There is no need to construct a new skip condition if all
29 * the skip conditions are affine.
31 static int if_need_skip_aff(struct pet_scop *scop_then,
32 struct pet_scop *scop_else, int have_else, enum pet_skip type)
34 if (scop_then && pet_scop_has_var_skip(scop_then, type))
35 return 1;
36 if (have_else && scop_else && pet_scop_has_var_skip(scop_else, type))
37 return 1;
38 return 0;
41 /* Do we need to construct a skip condition of the given type
42 * on an if statement?
44 static int if_need_skip(struct pet_scop *scop_then, struct pet_scop *scop_else,
45 int have_else, enum pet_skip type, int affine)
47 if (affine)
48 return if_need_skip_aff(scop_then, scop_else, have_else, type);
49 else
50 return if_need_skip_non(scop_then, scop_else, have_else, type);
53 /* Construct an affine expression pet_expr that evaluates
54 * to the constant "val" on "space".
56 static __isl_give pet_expr *universally(__isl_take isl_space *space, int val)
58 isl_ctx *ctx;
59 isl_local_space *ls;
60 isl_aff *aff;
61 isl_multi_pw_aff *mpa;
63 ctx = isl_space_get_ctx(space);
64 ls = isl_local_space_from_space(space);
65 aff = isl_aff_val_on_domain(ls, isl_val_int_from_si(ctx, val));
66 mpa = isl_multi_pw_aff_from_pw_aff(isl_pw_aff_from_aff(aff));
68 return pet_expr_from_index(mpa);
71 /* Construct an affine expression pet_expr that evaluates
72 * to the constant 1 on "space".
74 static __isl_give pet_expr *universally_true(__isl_take isl_space *space)
76 return universally(space, 1);
79 /* Construct an affine expression pet_expr that evaluates
80 * to the constant 0 on "space".
82 static __isl_give pet_expr *universally_false(__isl_take isl_space *space)
84 return universally(space, 0);
87 /* Given an index expression "test_index" for the if condition,
88 * an index expression "skip_index" for the skip condition and
89 * scops for the then and else branches, construct a scop for
90 * computing "skip_index" within the context "pc".
92 * The computed scop contains a single statement that essentially does
94 * skip_index = test_cond ? skip_cond_then : skip_cond_else
96 * If the skip conditions of the then and/or else branch are not affine,
97 * then they need to be filtered by test_index.
98 * If they are missing, then this means the skip condition is false.
100 * Since we are constructing a skip condition for the if statement,
101 * the skip conditions on the then and else branches are removed.
103 static struct pet_scop *extract_skip_if(__isl_take isl_multi_pw_aff *test_index,
104 __isl_take isl_multi_pw_aff *skip_index,
105 struct pet_scop *scop_then, struct pet_scop *scop_else, int have_else,
106 enum pet_skip type, __isl_keep pet_context *pc, struct pet_state *state)
108 pet_expr *expr_then, *expr_else, *expr, *expr_skip;
109 pet_tree *tree;
110 struct pet_stmt *stmt;
111 struct pet_scop *scop;
112 isl_ctx *ctx;
113 isl_set *domain;
115 if (!scop_then)
116 goto error;
117 if (have_else && !scop_else)
118 goto error;
120 ctx = isl_multi_pw_aff_get_ctx(test_index);
122 if (pet_scop_has_skip(scop_then, type)) {
123 expr_then = pet_scop_get_skip_expr(scop_then, type);
124 pet_scop_reset_skip(scop_then, type);
125 if (!pet_expr_is_affine(expr_then))
126 expr_then = pet_expr_filter(expr_then,
127 isl_multi_pw_aff_copy(test_index), 1);
128 } else
129 expr_then = universally_false(pet_context_get_space(pc));
131 if (have_else && pet_scop_has_skip(scop_else, type)) {
132 expr_else = pet_scop_get_skip_expr(scop_else, type);
133 pet_scop_reset_skip(scop_else, type);
134 if (!pet_expr_is_affine(expr_else))
135 expr_else = pet_expr_filter(expr_else,
136 isl_multi_pw_aff_copy(test_index), 0);
137 } else
138 expr_else = universally_false(pet_context_get_space(pc));
140 expr = pet_expr_from_index(test_index);
141 expr = pet_expr_new_ternary(expr, expr_then, expr_else);
142 expr_skip = pet_expr_from_index(isl_multi_pw_aff_copy(skip_index));
143 expr_skip = pet_expr_access_set_write(expr_skip, 1);
144 expr_skip = pet_expr_access_set_read(expr_skip, 0);
145 expr = pet_expr_new_binary(1, pet_op_assign, expr_skip, expr);
146 domain = pet_context_get_domain(pc);
147 tree = pet_tree_new_expr(expr);
148 stmt = pet_stmt_from_pet_tree(isl_set_copy(domain),
149 state->n_stmt++, tree);
151 scop = pet_scop_from_pet_stmt(pet_context_get_space(pc), stmt);
152 scop = pet_scop_add_boolean_array(scop, domain, skip_index,
153 state->int_size);
155 return scop;
156 error:
157 isl_multi_pw_aff_free(test_index);
158 isl_multi_pw_aff_free(skip_index);
159 return NULL;
162 /* Is scop's skip_now condition equal to its skip_later condition?
163 * In particular, this means that it either has no skip_now condition
164 * or both a skip_now and a skip_later condition (that are equal to each other).
166 static int skip_equals_skip_later(struct pet_scop *scop)
168 int has_skip_now, has_skip_later;
169 int equal;
170 isl_multi_pw_aff *skip_now, *skip_later;
172 if (!scop)
173 return 0;
174 has_skip_now = pet_scop_has_skip(scop, pet_skip_now);
175 has_skip_later = pet_scop_has_skip(scop, pet_skip_later);
176 if (has_skip_now != has_skip_later)
177 return 0;
178 if (!has_skip_now)
179 return 1;
181 skip_now = pet_scop_get_skip(scop, pet_skip_now);
182 skip_later = pet_scop_get_skip(scop, pet_skip_later);
183 equal = isl_multi_pw_aff_is_equal(skip_now, skip_later);
184 isl_multi_pw_aff_free(skip_now);
185 isl_multi_pw_aff_free(skip_later);
187 return equal;
190 /* Drop the skip conditions of type pet_skip_later from scop1 and scop2.
192 static void drop_skip_later(struct pet_scop *scop1, struct pet_scop *scop2)
194 pet_scop_reset_skip(scop1, pet_skip_later);
195 pet_scop_reset_skip(scop2, pet_skip_later);
198 /* Do we need to construct any skip condition?
200 int pet_skip_info_has_skip(struct pet_skip_info *skip)
202 return skip->skip[pet_skip_now] || skip->skip[pet_skip_later];
205 /* Initialize a pet_skip_info_if structure based on the then and else branches
206 * and based on whether the if condition is affine or not.
208 void pet_skip_info_if_init(struct pet_skip_info *skip, isl_ctx *ctx,
209 struct pet_scop *scop_then, struct pet_scop *scop_else,
210 int have_else, int affine)
212 skip->ctx = ctx;
213 skip->type = have_else ? pet_skip_if_else : pet_skip_if;
214 skip->u.i.scop_then = scop_then;
215 skip->u.i.scop_else = scop_else;
217 skip->skip[pet_skip_now] =
218 if_need_skip(scop_then, scop_else, have_else, pet_skip_now, affine);
219 skip->equal = skip->skip[pet_skip_now] &&
220 skip_equals_skip_later(scop_then) &&
221 (!have_else || skip_equals_skip_later(scop_else));
222 skip->skip[pet_skip_later] = skip->skip[pet_skip_now] &&
223 !skip->equal &&
224 if_need_skip(scop_then, scop_else, have_else,
225 pet_skip_later, affine);
228 /* If we need to construct a skip condition of the given type,
229 * then do so now, within the context "pc".
231 * "mpa" represents the if condition.
233 static void pet_skip_info_if_extract_type(struct pet_skip_info *skip,
234 __isl_keep isl_multi_pw_aff *mpa, enum pet_skip type,
235 __isl_keep pet_context *pc, struct pet_state *state)
237 isl_space *space;
239 if (!skip->skip[type])
240 return;
242 space = pet_context_get_space(pc);
243 skip->index[type] = pet_create_test_index(space, state->n_test++);
244 skip->scop[type] = extract_skip_if(isl_multi_pw_aff_copy(mpa),
245 isl_multi_pw_aff_copy(skip->index[type]),
246 skip->u.i.scop_then, skip->u.i.scop_else,
247 skip->type == pet_skip_if_else, type,
248 pc, state);
251 /* Construct the required skip conditions within the context "pc",
252 * given the if condition "index".
254 void pet_skip_info_if_extract_index(struct pet_skip_info *skip,
255 __isl_keep isl_multi_pw_aff *index, __isl_keep pet_context *pc,
256 struct pet_state *state)
258 pet_skip_info_if_extract_type(skip, index, pet_skip_now, pc, state);
259 pet_skip_info_if_extract_type(skip, index, pet_skip_later, pc, state);
260 if (skip->equal)
261 drop_skip_later(skip->u.i.scop_then, skip->u.i.scop_else);
264 /* Construct the required skip conditions within the context "pc",
265 * given the if condition "cond".
267 void pet_skip_info_if_extract_cond(struct pet_skip_info *skip,
268 __isl_keep isl_pw_aff *cond, __isl_keep pet_context *pc,
269 struct pet_state *state)
271 isl_multi_pw_aff *test;
273 if (!skip->skip[pet_skip_now] && !skip->skip[pet_skip_later])
274 return;
276 test = isl_multi_pw_aff_from_pw_aff(isl_pw_aff_copy(cond));
277 pet_skip_info_if_extract_index(skip, test, pc, state);
278 isl_multi_pw_aff_free(test);
281 /* Add the scops for computing the skip conditions to "main".
283 * If two scops are added, then they can be executed in parallel,
284 * but both scops need to be executed after the original statement.
285 * However, if "main" has any skip conditions, then they do not
286 * apply to the scops for computing skip conditions, so we temporarily
287 * remove the skip conditions while adding the scops.
289 struct pet_scop *pet_skip_info_add_scops(struct pet_skip_info *skip,
290 struct pet_scop *main)
292 int has_skip_now;
293 isl_multi_pw_aff *skip_now;
294 struct pet_scop *scop_skip;
296 if (!skip->skip[pet_skip_now] && !skip->skip[pet_skip_later])
297 return main;
299 has_skip_now = pet_scop_has_skip(main, pet_skip_now);
300 if (has_skip_now)
301 skip_now = pet_scop_get_skip(main, pet_skip_now);
302 pet_scop_reset_skip(main, pet_skip_now);
304 if (skip->skip[pet_skip_now] && skip->skip[pet_skip_later])
305 scop_skip = pet_scop_add_par(skip->ctx,
306 skip->scop[pet_skip_now],
307 skip->scop[pet_skip_later]);
308 else if (skip->skip[pet_skip_now])
309 scop_skip = skip->scop[pet_skip_now];
310 else
311 scop_skip = skip->scop[pet_skip_later];
312 main = pet_scop_add_seq(skip->ctx, main, scop_skip);
313 skip->scop[pet_skip_now] = NULL;
314 skip->scop[pet_skip_later] = NULL;
316 if (has_skip_now)
317 main = pet_scop_set_skip(main, pet_skip_now, skip_now);
319 return main;
322 /* Add the computed skip condition of the give type to "main".
324 * If equal is set, then we only computed a skip condition for pet_skip_now,
325 * but we also need to set it as main's pet_skip_later.
327 struct pet_scop *pet_skip_info_add_type(struct pet_skip_info *skip,
328 struct pet_scop *main, enum pet_skip type)
330 if (!skip->skip[type])
331 return main;
333 if (skip->equal)
334 main = pet_scop_set_skip(main, pet_skip_later,
335 isl_multi_pw_aff_copy(skip->index[type]));
337 main = pet_scop_set_skip(main, type, skip->index[type]);
338 skip->index[type] = NULL;
340 return main;
343 /* Add the computed skip conditions to "main" and
344 * add the scops for computing the conditions.
346 struct pet_scop *pet_skip_info_add(struct pet_skip_info *skip,
347 struct pet_scop *scop)
349 scop = pet_skip_info_add_scops(skip, scop);
350 scop = pet_skip_info_add_type(skip, scop, pet_skip_now);
351 scop = pet_skip_info_add_type(skip, scop, pet_skip_later);
353 return scop;
356 /* Do we need to construct a skip condition of the given type
357 * on a sequence of statements?
359 * There is no need to construct a new skip condition if only
360 * only of the two statements has a skip condition or if both
361 * of their skip conditions are affine.
363 * In principle we also don't need a new continuation variable if
364 * the continuation of scop2 is affine, but then we would need
365 * to allow more complicated forms of continuations.
367 static int seq_need_skip(struct pet_scop *scop1, struct pet_scop *scop2,
368 enum pet_skip type)
370 if (!scop1 || !pet_scop_has_skip(scop1, type))
371 return 0;
372 if (!scop2 || !pet_scop_has_skip(scop2, type))
373 return 0;
374 if (pet_scop_has_affine_skip(scop1, type) &&
375 pet_scop_has_affine_skip(scop2, type))
376 return 0;
377 return 1;
380 /* Construct a scop for computing the skip condition of the given type and
381 * with index expression "skip_index" for a sequence of two scops "scop1"
382 * and "scop2". Do so within the context "pc".
384 * The computed scop contains a single statement that essentially does
386 * skip_index = skip_cond_1 ? 1 : skip_cond_2
388 * or, in other words, skip_cond1 || skip_cond2.
389 * In this expression, skip_cond_2 is filtered to reflect that it is
390 * only evaluated when skip_cond_1 is false.
392 * The skip condition on scop1 is not removed because it still needs
393 * to be applied to scop2 when these two scops are combined.
395 static struct pet_scop *extract_skip_seq(
396 __isl_take isl_multi_pw_aff *skip_index,
397 struct pet_scop *scop1, struct pet_scop *scop2, enum pet_skip type,
398 __isl_keep pet_context *pc, struct pet_state *state)
400 pet_expr *expr1, *expr2, *expr, *expr_skip;
401 pet_tree *tree;
402 struct pet_stmt *stmt;
403 struct pet_scop *scop;
404 isl_ctx *ctx;
405 isl_set *domain;
407 if (!scop1 || !scop2)
408 goto error;
410 ctx = isl_multi_pw_aff_get_ctx(skip_index);
412 expr1 = pet_scop_get_skip_expr(scop1, type);
413 expr2 = pet_scop_get_skip_expr(scop2, type);
414 pet_scop_reset_skip(scop2, type);
416 expr2 = pet_expr_filter(expr2, pet_expr_access_get_index(expr1), 0);
418 expr = universally_true(pet_context_get_space(pc));
419 expr = pet_expr_new_ternary(expr1, expr, expr2);
420 expr_skip = pet_expr_from_index(isl_multi_pw_aff_copy(skip_index));
421 expr_skip = pet_expr_access_set_write(expr_skip, 1);
422 expr_skip = pet_expr_access_set_read(expr_skip, 0);
423 expr = pet_expr_new_binary(1, pet_op_assign, expr_skip, expr);
424 domain = pet_context_get_domain(pc);
425 tree = pet_tree_new_expr(expr);
426 stmt = pet_stmt_from_pet_tree(isl_set_copy(domain),
427 state->n_stmt++, tree);
429 scop = pet_scop_from_pet_stmt(pet_context_get_space(pc), stmt);
430 scop = pet_scop_add_boolean_array(scop, domain, skip_index,
431 state->int_size);
433 return scop;
434 error:
435 isl_multi_pw_aff_free(skip_index);
436 return NULL;
439 /* Initialize a pet_skip_info_seq structure based on
440 * on the two statements that are going to be combined.
442 void pet_skip_info_seq_init(struct pet_skip_info *skip, isl_ctx *ctx,
443 struct pet_scop *scop1, struct pet_scop *scop2)
445 skip->ctx = ctx;
446 skip->type = pet_skip_seq;
447 skip->u.s.scop1 = scop1;
448 skip->u.s.scop2 = scop2;
450 skip->skip[pet_skip_now] = seq_need_skip(scop1, scop2, pet_skip_now);
451 skip->equal = skip->skip[pet_skip_now] &&
452 skip_equals_skip_later(scop1) && skip_equals_skip_later(scop2);
453 skip->skip[pet_skip_later] = skip->skip[pet_skip_now] && !skip->equal &&
454 seq_need_skip(scop1, scop2, pet_skip_later);
457 /* If we need to construct a skip condition of the given type,
458 * then do so now, within the context "pc".
460 static void pet_skip_info_seq_extract_type(struct pet_skip_info *skip,
461 enum pet_skip type, __isl_keep pet_context *pc, struct pet_state *state)
463 isl_space *space;
465 if (!skip->skip[type])
466 return;
468 space = pet_context_get_space(pc);
469 skip->index[type] = pet_create_test_index(space, state->n_test++);
470 skip->scop[type] = extract_skip_seq(
471 isl_multi_pw_aff_copy(skip->index[type]),
472 skip->u.s.scop1, skip->u.s.scop2, type,
473 pc, state);
476 /* Construct the required skip conditions within the context "pc".
478 void pet_skip_info_seq_extract(struct pet_skip_info *skip,
479 __isl_keep pet_context *pc, struct pet_state *state)
481 pet_skip_info_seq_extract_type(skip, pet_skip_now, pc, state);
482 pet_skip_info_seq_extract_type(skip, pet_skip_later, pc, state);
483 if (skip->equal)
484 drop_skip_later(skip->u.s.scop1, skip->u.s.scop2);