* Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
*/
+#include <isl_ctx_private.h>
+#include <isl_map_private.h>
#include <isl/ilp.h>
-#include "isl_map_private.h"
#include "isl_sample.h"
#include <isl/seq.h>
#include "isl_equalities.h"
+#include <isl_aff_private.h>
+#include <isl_local_space_private.h>
+#include <isl_mat_private.h>
/* Given a basic set "bset", construct a basic set U such that for
* each element x in U, the whole unit box positioned at x is inside
isl_assert(bset->ctx, isl_basic_set_n_param(bset) == 0, goto error);
- if (isl_basic_set_fast_is_empty(bset))
+ if (isl_basic_set_plain_is_empty(bset))
return isl_lp_empty;
if (bset->n_eq)
isl_basic_set_free(bset);
return isl_lp_error;
}
+
+static enum isl_lp_result basic_set_opt(__isl_keep isl_basic_set *bset, int max,
+ __isl_keep isl_aff *obj, isl_int *opt)
+{
+ enum isl_lp_result res;
+
+ if (!obj)
+ return isl_lp_error;
+ bset = isl_basic_set_copy(bset);
+ bset = isl_basic_set_underlying_set(bset);
+ res = isl_basic_set_solve_ilp(bset, max, obj->v->el + 1, opt, NULL);
+ isl_basic_set_free(bset);
+ return res;
+}
+
+static __isl_give isl_mat *extract_divs(__isl_keep isl_basic_set *bset)
+{
+ int i;
+ isl_ctx *ctx = isl_basic_set_get_ctx(bset);
+ isl_mat *div;
+
+ div = isl_mat_alloc(ctx, bset->n_div,
+ 1 + 1 + isl_basic_set_total_dim(bset));
+ if (!div)
+ return NULL;
+
+ for (i = 0; i < bset->n_div; ++i)
+ isl_seq_cpy(div->row[i], bset->div[i], div->n_col);
+
+ return div;
+}
+
+enum isl_lp_result isl_basic_set_opt(__isl_keep isl_basic_set *bset, int max,
+ __isl_keep isl_aff *obj, isl_int *opt)
+{
+ int *exp1 = NULL;
+ int *exp2 = NULL;
+ isl_ctx *ctx;
+ isl_mat *bset_div = NULL;
+ isl_mat *div = NULL;
+ enum isl_lp_result res;
+
+ if (!bset || !obj)
+ return isl_lp_error;
+
+ ctx = isl_aff_get_ctx(obj);
+ if (!isl_dim_equal(bset->dim, obj->ls->dim))
+ isl_die(ctx, isl_error_invalid,
+ "spaces don't match", return isl_lp_error);
+ if (!isl_int_is_one(obj->v->el[0]))
+ isl_die(ctx, isl_error_unsupported,
+ "expecting integer affine expression",
+ return isl_lp_error);
+
+ if (bset->n_div == 0 && obj->ls->div->n_row == 0)
+ return basic_set_opt(bset, max, obj, opt);
+
+ bset = isl_basic_set_copy(bset);
+ obj = isl_aff_copy(obj);
+
+ bset_div = extract_divs(bset);
+ exp1 = isl_alloc_array(ctx, int, bset_div->n_row);
+ exp2 = isl_alloc_array(ctx, int, obj->ls->div->n_row);
+ if (!bset_div || !exp1 || !exp2)
+ goto error;
+
+ div = isl_merge_divs(bset_div, obj->ls->div, exp1, exp2);
+
+ bset = isl_basic_set_expand_divs(bset, isl_mat_copy(div), exp1);
+ obj = isl_aff_expand_divs(obj, isl_mat_copy(div), exp2);
+
+ res = basic_set_opt(bset, max, obj, opt);
+
+ isl_mat_free(bset_div);
+ isl_mat_free(div);
+ free(exp1);
+ free(exp2);
+ isl_basic_set_free(bset);
+ isl_aff_free(obj);
+
+ return res;
+error:
+ isl_mat_free(div);
+ isl_mat_free(bset_div);
+ free(exp1);
+ free(exp2);
+ isl_basic_set_free(bset);
+ isl_aff_free(obj);
+ return isl_lp_error;
+}
+
+/* Compute the minimum (maximum if max is set) of the integer affine
+ * expression obj over the points in set and put the result in *opt.
+ */
+enum isl_lp_result isl_set_opt(__isl_keep isl_set *set, int max,
+ __isl_keep isl_aff *obj, isl_int *opt)
+{
+ int i;
+ enum isl_lp_result res;
+ int empty = 1;
+ isl_int opt_i;
+
+ if (!set || !obj)
+ return isl_lp_error;
+ if (set->n == 0)
+ return isl_lp_empty;
+
+ res = isl_basic_set_opt(set->p[0], max, obj, opt);
+ if (res == isl_lp_error || res == isl_lp_unbounded)
+ return res;
+ if (set->n == 1)
+ return res;
+ if (res == isl_lp_ok)
+ empty = 0;
+
+ isl_int_init(opt_i);
+ for (i = 1; i < set->n; ++i) {
+ res = isl_basic_set_opt(set->p[i], max, obj, &opt_i);
+ if (res == isl_lp_error || res == isl_lp_unbounded) {
+ isl_int_clear(opt_i);
+ return res;
+ }
+ if (res == isl_lp_ok)
+ empty = 0;
+ if (isl_int_gt(opt_i, *opt))
+ isl_int_set(*opt, opt_i);
+ }
+ isl_int_clear(opt_i);
+
+ return empty ? isl_lp_empty : isl_lp_ok;
+}
+
+enum isl_lp_result isl_basic_set_max(__isl_keep isl_basic_set *bset,
+ __isl_keep isl_aff *obj, isl_int *opt)
+{
+ return isl_basic_set_opt(bset, 1, obj, opt);
+}
+
+enum isl_lp_result isl_set_max(__isl_keep isl_set *set,
+ __isl_keep isl_aff *obj, isl_int *opt)
+{
+ return isl_set_opt(set, 1, obj, opt);
+}