/*
* Copyright 2008-2009 Katholieke Universiteit Leuven
*
- * Use of this software is governed by the GNU LGPLv2.1 license
+ * Use of this software is governed by the MIT license
*
* Written by Sven Verdoolaege, K.U.Leuven, Departement
* Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
#include <isl/seq.h>
#include "isl_tab.h"
#include <isl_options_private.h>
+#include <isl_local_space_private.h>
+#include <isl_aff_private.h>
+#include <isl_mat_private.h>
+#include <isl_val_private.h>
enum isl_lp_result isl_tab_solve_lp(struct isl_basic_map *bmap, int maximize,
isl_int *f, isl_int denom, isl_int *opt,
isl_seq_neg(f, f, 1 + dim);
bmap = isl_basic_map_gauss(bmap, NULL);
- tab = isl_tab_from_basic_map(bmap);
+ tab = isl_tab_from_basic_map(bmap, 0);
res = isl_tab_min(tab, f, denom, opt, opt_denom, 0);
if (res == isl_lp_ok && sol) {
*sol = isl_tab_get_sample_value(tab);
return isl_map_solve_lp((struct isl_map *)set, max,
f, d, opt, opt_denom, sol);
}
+
+/* Return the optimal (rational) value of "obj" over "bset", assuming
+ * that "obj" and "bset" have aligned parameters and divs.
+ * If "max" is set, then the maximal value is computed.
+ * Otherwise, the minimal value is computed.
+ *
+ * Return infinity or negative infinity if the optimal value is unbounded and
+ * NaN if "bset" is empty.
+ *
+ * Call isl_basic_set_solve_lp and translate the results.
+ */
+static __isl_give isl_val *basic_set_opt_lp(
+ __isl_keep isl_basic_set *bset, int max, __isl_keep isl_aff *obj)
+{
+ isl_ctx *ctx;
+ isl_val *res;
+ enum isl_lp_result lp_res;
+
+ if (!bset || !obj)
+ return NULL;
+
+ ctx = isl_aff_get_ctx(obj);
+ res = isl_val_alloc(ctx);
+ if (!res)
+ return NULL;
+ lp_res = isl_basic_set_solve_lp(bset, max, obj->v->el + 1,
+ obj->v->el[0], &res->n, &res->d, NULL);
+ if (lp_res == isl_lp_ok)
+ return isl_val_normalize(res);
+ isl_val_free(res);
+ if (lp_res == isl_lp_error)
+ return NULL;
+ if (lp_res == isl_lp_empty)
+ return isl_val_nan(ctx);
+ if (max)
+ return isl_val_infty(ctx);
+ else
+ return isl_val_neginfty(ctx);
+}
+
+/* Return the optimal (rational) value of "obj" over "bset", assuming
+ * that "obj" and "bset" have aligned parameters.
+ * If "max" is set, then the maximal value is computed.
+ * Otherwise, the minimal value is computed.
+ *
+ * Return infinity or negative infinity if the optimal value is unbounded and
+ * NaN if "bset" is empty.
+ *
+ * Align the divs of "bset" and "obj" and call basic_set_opt_lp.
+ */
+static __isl_give isl_val *isl_basic_set_opt_lp_val_aligned(
+ __isl_keep isl_basic_set *bset, int max, __isl_keep isl_aff *obj)
+{
+ int *exp1 = NULL;
+ int *exp2 = NULL;
+ isl_ctx *ctx;
+ isl_mat *bset_div = NULL;
+ isl_mat *div = NULL;
+ isl_val *res;
+
+ if (!bset || !obj)
+ return NULL;
+
+ ctx = isl_aff_get_ctx(obj);
+ if (!isl_space_is_equal(bset->dim, obj->ls->dim))
+ isl_die(ctx, isl_error_invalid,
+ "spaces don't match", return NULL);
+
+ if (bset->n_div == 0 && obj->ls->div->n_row == 0)
+ return basic_set_opt_lp(bset, max, obj);
+
+ bset = isl_basic_set_copy(bset);
+ obj = isl_aff_copy(obj);
+
+ bset_div = isl_basic_set_get_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_lp(bset, max, obj);
+
+ 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 NULL;
+}
+
+/* Return the optimal (rational) value of "obj" over "bset".
+ * If "max" is set, then the maximal value is computed.
+ * Otherwise, the minimal value is computed.
+ *
+ * Return infinity or negative infinity if the optimal value is unbounded and
+ * NaN if "bset" is empty.
+ */
+static __isl_give isl_val *isl_basic_set_opt_lp_val(
+ __isl_keep isl_basic_set *bset, int max, __isl_keep isl_aff *obj)
+{
+ isl_val *res;
+
+ if (!bset || !obj)
+ return NULL;
+
+ if (isl_space_match(bset->dim, isl_dim_param,
+ obj->ls->dim, isl_dim_param))
+ return isl_basic_set_opt_lp_val_aligned(bset, max, obj);
+
+ bset = isl_basic_set_copy(bset);
+ obj = isl_aff_copy(obj);
+ bset = isl_basic_set_align_params(bset, isl_aff_get_domain_space(obj));
+ obj = isl_aff_align_params(obj, isl_basic_set_get_space(bset));
+
+ res = isl_basic_set_opt_lp_val_aligned(bset, max, obj);
+
+ isl_basic_set_free(bset);
+ isl_aff_free(obj);
+
+ return res;
+}
+
+/* Return the minimal (rational) value of "obj" over "bset".
+ *
+ * Return negative infinity if the minimal value is unbounded and
+ * NaN if "bset" is empty.
+ */
+__isl_give isl_val *isl_basic_set_min_lp_val(__isl_keep isl_basic_set *bset,
+ __isl_keep isl_aff *obj)
+{
+ return isl_basic_set_opt_lp_val(bset, 0, obj);
+}
+
+/* Return the maximal (rational) value of "obj" over "bset".
+ *
+ * Return infinity if the maximal value is unbounded and
+ * NaN if "bset" is empty.
+ */
+__isl_give isl_val *isl_basic_set_max_lp_val(__isl_keep isl_basic_set *bset,
+ __isl_keep isl_aff *obj)
+{
+ return isl_basic_set_opt_lp_val(bset, 1, obj);
+}
projects / platform / upstream / isl.git / blobdiff