2 * Copyright 2008-2009 Katholieke Universiteit Leuven
4 * Use of this software is governed by the GNU LGPLv2.1 license
6 * Written by Sven Verdoolaege, K.U.Leuven, Departement
7 * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
10 #include <isl_constraint.h>
12 #include "isl_map_private.h"
14 static unsigned n(struct isl_constraint *c, enum isl_dim_type type)
16 return isl_basic_map_dim(c->bmap, type);
19 static unsigned offset(struct isl_constraint *c, enum isl_dim_type type)
21 struct isl_dim *dim = c->bmap->dim;
23 case isl_dim_param: return 1;
24 case isl_dim_in: return 1 + dim->nparam;
25 case isl_dim_out: return 1 + dim->nparam + dim->n_in;
26 case isl_dim_div: return 1 + dim->nparam + dim->n_in + dim->n_out;
30 static unsigned basic_set_offset(struct isl_basic_set *bset,
31 enum isl_dim_type type)
33 struct isl_dim *dim = bset->dim;
35 case isl_dim_param: return 1;
36 case isl_dim_in: return 1 + dim->nparam;
37 case isl_dim_out: return 1 + dim->nparam + dim->n_in;
38 case isl_dim_div: return 1 + dim->nparam + dim->n_in + dim->n_out;
42 struct isl_constraint *isl_basic_map_constraint(struct isl_basic_map *bmap,
45 struct isl_constraint *constraint;
50 constraint = isl_alloc_type(bmap->ctx, struct isl_constraint);
54 constraint->ctx = bmap->ctx;
55 isl_ctx_ref(constraint->ctx);
57 constraint->bmap = bmap;
58 constraint->line = line;
62 isl_basic_map_free(bmap);
66 struct isl_constraint *isl_basic_set_constraint(struct isl_basic_set *bset,
69 return isl_basic_map_constraint((struct isl_basic_map *)bset, line);
72 struct isl_constraint *isl_equality_alloc(struct isl_dim *dim)
74 struct isl_basic_map *bmap;
79 bmap = isl_basic_map_alloc_dim(dim, 0, 1, 0);
83 isl_basic_map_alloc_equality(bmap);
84 isl_seq_clr(bmap->eq[0], 1 + isl_basic_map_total_dim(bmap));
85 return isl_basic_map_constraint(bmap, &bmap->eq[0]);
88 struct isl_constraint *isl_inequality_alloc(struct isl_dim *dim)
90 struct isl_basic_map *bmap;
95 bmap = isl_basic_map_alloc_dim(dim, 0, 0, 1);
99 isl_basic_map_alloc_inequality(bmap);
100 isl_seq_clr(bmap->ineq[0], 1 + isl_basic_map_total_dim(bmap));
101 return isl_basic_map_constraint(bmap, &bmap->ineq[0]);
104 struct isl_constraint *isl_constraint_dup(struct isl_constraint *c)
109 return isl_basic_map_constraint(isl_basic_map_copy(c->bmap), c->line);
112 struct isl_constraint *isl_constraint_cow(struct isl_constraint *c)
120 return isl_constraint_dup(c);
123 struct isl_constraint *isl_constraint_copy(struct isl_constraint *constraint)
132 void isl_constraint_free(struct isl_constraint *c)
140 isl_basic_map_free(c->bmap);
141 isl_ctx_deref(c->ctx);
145 __isl_give isl_constraint *isl_basic_map_first_constraint(
146 __isl_take isl_basic_map *bmap)
152 return isl_basic_map_constraint(bmap, &bmap->eq[0]);
154 if (bmap->n_ineq > 0)
155 return isl_basic_map_constraint(bmap, &bmap->ineq[0]);
157 isl_basic_map_free(bmap);
161 __isl_give isl_constraint *isl_basic_set_first_constraint(
162 __isl_take isl_basic_set *bset)
164 return isl_basic_map_first_constraint((struct isl_basic_map *)bset);
167 struct isl_constraint *isl_constraint_next(struct isl_constraint *c)
169 c = isl_constraint_cow(c);
170 if (c->line >= c->bmap->eq) {
172 if (c->line < c->bmap->eq + c->bmap->n_eq)
174 c->line = c->bmap->ineq;
177 if (c->line < c->bmap->ineq + c->bmap->n_ineq)
179 isl_constraint_free(c);
183 int isl_constraint_is_equal(struct isl_constraint *constraint1,
184 struct isl_constraint *constraint2)
186 if (!constraint1 || !constraint2)
188 return constraint1->bmap == constraint2->bmap &&
189 constraint1->line == constraint2->line;
192 struct isl_basic_map *isl_basic_map_add_constraint(
193 struct isl_basic_map *bmap, struct isl_constraint *constraint)
195 if (!bmap || !constraint)
198 isl_assert(constraint->ctx,
199 isl_dim_equal(bmap->dim, constraint->bmap->dim), goto error);
201 bmap = isl_basic_map_intersect(bmap,
202 isl_basic_map_from_constraint(constraint));
205 isl_basic_map_free(bmap);
206 isl_constraint_free(constraint);
210 struct isl_basic_set *isl_basic_set_add_constraint(
211 struct isl_basic_set *bset, struct isl_constraint *constraint)
213 return (struct isl_basic_set *)
214 isl_basic_map_add_constraint((struct isl_basic_map *)bset,
218 struct isl_constraint *isl_constraint_add_div(struct isl_constraint *constraint,
219 struct isl_div *div, int *pos)
221 if (!constraint || !div)
224 isl_assert(constraint->ctx,
225 isl_dim_equal(div->bmap->dim, constraint->bmap->dim), goto error);
226 isl_assert(constraint->ctx,
227 constraint->bmap->n_eq + constraint->bmap->n_ineq == 1, goto error);
229 constraint->bmap = isl_basic_map_cow(constraint->bmap);
230 constraint->bmap = isl_basic_map_extend_dim(constraint->bmap,
231 isl_dim_copy(constraint->bmap->dim), 1, 0, 0);
232 if (!constraint->bmap)
234 constraint->line = &constraint->bmap->eq[0];
235 *pos = isl_basic_map_alloc_div(constraint->bmap);
238 isl_seq_cpy(constraint->bmap->div[*pos], div->line[0],
239 1 + 1 + isl_basic_map_total_dim(constraint->bmap));
243 isl_constraint_free(constraint);
248 int isl_constraint_dim(struct isl_constraint *constraint,
249 enum isl_dim_type type)
253 return n(constraint, type);
256 void isl_constraint_get_constant(struct isl_constraint *constraint, isl_int *v)
260 isl_int_set(*v, constraint->line[0][0]);
263 void isl_constraint_get_coefficient(struct isl_constraint *constraint,
264 enum isl_dim_type type, int pos, isl_int *v)
269 isl_assert(constraint->ctx, pos < n(constraint, type), return);
270 isl_int_set(*v, constraint->line[0][offset(constraint, type) + pos]);
273 struct isl_div *isl_constraint_div(struct isl_constraint *constraint, int pos)
278 isl_assert(constraint->ctx, pos < n(constraint, isl_dim_div),
280 return isl_basic_map_div(isl_basic_map_copy(constraint->bmap), pos);
283 void isl_constraint_set_constant(struct isl_constraint *constraint, isl_int v)
287 isl_int_set(constraint->line[0][0], v);
290 void isl_constraint_set_coefficient(struct isl_constraint *constraint,
291 enum isl_dim_type type, int pos, isl_int v)
296 isl_assert(constraint->ctx, pos < n(constraint, type), return);
297 isl_int_set(constraint->line[0][offset(constraint, type) + pos], v);
300 void isl_constraint_clear(struct isl_constraint *constraint)
306 total = isl_basic_map_total_dim(constraint->bmap);
307 isl_seq_clr(constraint->line[0], 1 + total);
310 struct isl_constraint *isl_constraint_negate(struct isl_constraint *constraint)
317 isl_assert(constraint->ctx, !isl_constraint_is_equality(constraint),
319 isl_assert(constraint->ctx, constraint->bmap->ref == 1, goto error);
320 total = isl_basic_map_total_dim(constraint->bmap);
321 isl_seq_neg(constraint->line[0], constraint->line[0], 1 + total);
322 isl_int_sub_ui(constraint->line[0][0], constraint->line[0][0], 1);
323 ISL_F_CLR(constraint->bmap, ISL_BASIC_MAP_NORMALIZED);
326 isl_constraint_free(constraint);
330 int isl_constraint_is_equality(struct isl_constraint *constraint)
334 return constraint->line >= constraint->bmap->eq;
337 __isl_give isl_basic_map *isl_basic_map_from_constraint(
338 __isl_take isl_constraint *constraint)
341 struct isl_basic_map *bmap;
348 if (constraint->bmap->n_eq + constraint->bmap->n_ineq == 1) {
349 bmap = isl_basic_map_copy(constraint->bmap);
350 isl_constraint_free(constraint);
354 bmap = isl_basic_map_universe_like(constraint->bmap);
355 bmap = isl_basic_map_align_divs(bmap, constraint->bmap);
356 bmap = isl_basic_map_cow(bmap);
357 bmap = isl_basic_map_extend_constraints(bmap, 1, 1);
358 if (isl_constraint_is_equality(constraint)) {
359 k = isl_basic_map_alloc_equality(bmap);
365 k = isl_basic_map_alloc_inequality(bmap);
370 total = isl_basic_map_total_dim(bmap);
371 isl_seq_cpy(c, constraint->line[0], 1 + total);
372 isl_constraint_free(constraint);
375 isl_constraint_free(constraint);
376 isl_basic_map_free(bmap);
380 struct isl_basic_set *isl_basic_set_from_constraint(
381 struct isl_constraint *constraint)
386 isl_assert(constraint->ctx,n(constraint, isl_dim_in) == 0, goto error);
387 return (isl_basic_set *)isl_basic_map_from_constraint(constraint);
389 isl_constraint_free(constraint);
393 int isl_basic_set_has_defining_equality(
394 struct isl_basic_set *bset, enum isl_dim_type type, int pos,
395 struct isl_constraint **c)
403 offset = basic_set_offset(bset, type);
404 total = isl_basic_set_total_dim(bset);
405 isl_assert(bset->ctx, pos < isl_basic_set_dim(bset, type), return -1);
406 for (i = 0; i < bset->n_eq; ++i)
407 if (!isl_int_is_zero(bset->eq[i][offset + pos]) &&
408 isl_seq_first_non_zero(bset->eq[i]+offset+pos+1,
409 1+total-offset-pos-1) == -1) {
410 *c= isl_basic_set_constraint(isl_basic_set_copy(bset),
417 int isl_basic_set_has_defining_inequalities(
418 struct isl_basic_set *bset, enum isl_dim_type type, int pos,
419 struct isl_constraint **lower,
420 struct isl_constraint **upper)
426 isl_int **lower_line, **upper_line;
430 offset = basic_set_offset(bset, type);
431 total = isl_basic_set_total_dim(bset);
432 isl_assert(bset->ctx, pos < isl_basic_set_dim(bset, type), return -1);
434 for (i = 0; i < bset->n_ineq; ++i) {
435 if (isl_int_is_zero(bset->ineq[i][offset + pos]))
437 if (isl_int_is_one(bset->ineq[i][offset + pos]))
439 if (isl_int_is_negone(bset->ineq[i][offset + pos]))
441 if (isl_seq_first_non_zero(bset->ineq[i]+offset+pos+1,
442 1+total-offset-pos-1) != -1)
444 for (j = i + 1; j < bset->n_ineq; ++j) {
445 if (!isl_seq_is_neg(bset->ineq[i]+1, bset->ineq[j]+1,
448 isl_int_add(m, bset->ineq[i][0], bset->ineq[j][0]);
449 if (isl_int_abs_ge(m, bset->ineq[i][offset+pos]))
452 if (isl_int_is_pos(bset->ineq[i][offset+pos])) {
453 lower_line = &bset->ineq[i];
454 upper_line = &bset->ineq[j];
456 lower_line = &bset->ineq[j];
457 upper_line = &bset->ineq[i];
459 *lower = isl_basic_set_constraint(
460 isl_basic_set_copy(bset), lower_line);
461 *upper = isl_basic_set_constraint(
462 isl_basic_set_copy(bset), upper_line);