X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=isl_lp.c;h=aed25d12386c17a42fa2fb155d4be2f70af0c583;hb=3d9f65131f9da197bca3a30eccf3a70107f50f03;hp=acecd22ecc2388e108fe9ef57d9e8951282a7eee;hpb=6ee7c30d7fedfd81f6254fe15534a154ce7624a1;p=platform%2Fupstream%2Fisl.git

diff --git a/isl_lp.c b/isl_lp.c
index acecd22..aed25d1 100644
--- a/isl_lp.c
+++ b/isl_lp.c
@@ -1,10 +1,366 @@
-#include "isl_ctx.h"
-#include "isl_lp.h"
+/*
+ * Copyright 2008-2009 Katholieke Universiteit Leuven
+ *
+ * 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_ctx_private.h>
+#include <isl_map_private.h>
+#include <isl/lp.h>
 #include "isl_lp_piplib.h"
+#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_solve_lp(struct isl_basic_map *bmap, int maximize,
+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_int *opt_denom)
+				      isl_int *opt_denom,
+				      struct isl_vec **sol)
+{
+	struct isl_tab *tab;
+	enum isl_lp_result res;
+	unsigned dim = isl_basic_map_total_dim(bmap);
+
+	if (maximize)
+		isl_seq_neg(f, f, 1 + dim);
+
+	bmap = isl_basic_map_gauss(bmap, NULL);
+	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);
+		if (!*sol)
+			res = isl_lp_error;
+	}
+	isl_tab_free(tab);
+
+	if (maximize)
+		isl_seq_neg(f, f, 1 + dim);
+	if (maximize && opt)
+		isl_int_neg(*opt, *opt);
+
+	return res;
+}
+
+/* Given a basic map "bmap" and an affine combination of the variables "f"
+ * with denominator "denom", set *opt / *opt_denom to the minimal
+ * (or maximal if "maximize" is true) value attained by f/d over "bmap",
+ * assuming the basic map is not empty and the expression cannot attain
+ * arbitrarily small (or large) values.
+ * If opt_denom is NULL, then *opt is rounded up (or down)
+ * to the nearest integer.
+ * The return value reflects the nature of the result (empty, unbounded,
+ * minmimal or maximal value returned in *opt).
+ */
+enum isl_lp_result isl_basic_map_solve_lp(struct isl_basic_map *bmap, int max,
+				      isl_int *f, isl_int d, isl_int *opt,
+				      isl_int *opt_denom,
+				      struct isl_vec **sol)
+{
+	if (sol)
+		*sol = NULL;
+
+	if (!bmap)
+		return isl_lp_error;
+
+	switch (bmap->ctx->opt->lp_solver) {
+	case ISL_LP_PIP:
+		return isl_pip_solve_lp(bmap, max, f, d, opt, opt_denom, sol);
+	case ISL_LP_TAB:
+		return isl_tab_solve_lp(bmap, max, f, d, opt, opt_denom, sol);
+	default:
+		return isl_lp_error;
+	}
+}
+
+enum isl_lp_result isl_basic_set_solve_lp(struct isl_basic_set *bset, int max,
+				      isl_int *f, isl_int d, isl_int *opt,
+				      isl_int *opt_denom,
+				      struct isl_vec **sol)
+{
+	return isl_basic_map_solve_lp((struct isl_basic_map *)bset, max,
+					f, d, opt, opt_denom, sol);
+}
+
+enum isl_lp_result isl_map_solve_lp(__isl_keep isl_map *map, int max,
+				      isl_int *f, isl_int d, isl_int *opt,
+				      isl_int *opt_denom,
+				      struct isl_vec **sol)
+{
+	int i;
+	isl_int o;
+	isl_int t;
+	isl_int opt_i;
+	isl_int opt_denom_i;
+	enum isl_lp_result res;
+	int max_div;
+	isl_vec *v = NULL;
+
+	if (!map)
+		return isl_lp_error;
+	if (map->n == 0)
+		return isl_lp_empty;
+
+	max_div = 0;
+	for (i = 0; i < map->n; ++i)
+		if (map->p[i]->n_div > max_div)
+			max_div = map->p[i]->n_div;
+	if (max_div > 0) {
+		unsigned total = isl_space_dim(map->dim, isl_dim_all);
+		v = isl_vec_alloc(map->ctx, 1 + total + max_div);
+		if (!v)
+			return isl_lp_error;
+		isl_seq_cpy(v->el, f, 1 + total);
+		isl_seq_clr(v->el + 1 + total, max_div);
+		f = v->el;
+	}
+
+	if (!opt && map->n > 1 && sol) {
+		isl_int_init(o);
+		opt = &o;
+	}
+	if (map->n > 0)
+		isl_int_init(opt_i);
+	if (map->n > 0 && opt_denom) {
+		isl_int_init(opt_denom_i);
+		isl_int_init(t);
+	}
+
+	res = isl_basic_map_solve_lp(map->p[0], max, f, d,
+					opt, opt_denom, sol);
+	if (res == isl_lp_error || res == isl_lp_unbounded)
+		goto done;
+
+	if (sol)
+		*sol = NULL;
+
+	for (i = 1; i < map->n; ++i) {
+		isl_vec *sol_i = NULL;
+		enum isl_lp_result res_i;
+		int better;
+
+		res_i = isl_basic_map_solve_lp(map->p[i], max, f, d,
+					    &opt_i,
+					    opt_denom ? &opt_denom_i : NULL,
+					    sol ? &sol_i : NULL);
+		if (res_i == isl_lp_error || res_i == isl_lp_unbounded) {
+			res = res_i;
+			goto done;
+		}
+		if (res_i == isl_lp_empty)
+			continue;
+		if (res == isl_lp_empty) {
+			better = 1;
+		} else if (!opt_denom) {
+			if (max)
+				better = isl_int_gt(opt_i, *opt);
+			else
+				better = isl_int_lt(opt_i, *opt);
+		} else {
+			isl_int_mul(t, opt_i, *opt_denom);
+			isl_int_submul(t, *opt, opt_denom_i);
+			if (max)
+				better = isl_int_is_pos(t);
+			else
+				better = isl_int_is_neg(t);
+		}
+		if (better) {
+			res = res_i;
+			if (opt)
+				isl_int_set(*opt, opt_i);
+			if (opt_denom)
+				isl_int_set(*opt_denom, opt_denom_i);
+			if (sol) {
+				isl_vec_free(*sol);
+				*sol = sol_i;
+			}
+		} else
+			isl_vec_free(sol_i);
+	}
+
+done:
+	isl_vec_free(v);
+	if (map->n > 0 && opt_denom) {
+		isl_int_clear(opt_denom_i);
+		isl_int_clear(t);
+	}
+	if (map->n > 0)
+		isl_int_clear(opt_i);
+	if (opt == &o)
+		isl_int_clear(o);
+	return res;
+}
+
+enum isl_lp_result isl_set_solve_lp(__isl_keep isl_set *set, int max,
+				      isl_int *f, isl_int d, isl_int *opt,
+				      isl_int *opt_denom,
+				      struct isl_vec **sol)
+{
+	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_pip_solve_lp(bmap, maximize, f, denom, opt, opt_denom);
+	return isl_basic_set_opt_lp_val(bset, 1, obj);
 }