+/*
+ * Copyright 2008-2009 Katholieke Universiteit Leuven
+ *
+ * Use of this software is governed by the GNU LGPLv2.1 license
+ *
+ * Written by Sven Verdoolaege, K.U.Leuven, Departement
+ * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
+ */
+
#include "isl_map_private.h"
#include "isl_seq.h"
#include "isl_tab.h"
sol->empty = isl_set_grow(sol->empty, 1);
bset = isl_basic_set_simplify(bset);
bset = isl_basic_set_finalize(bset);
- sol->empty = isl_set_add(sol->empty, isl_basic_set_copy(bset));
+ sol->empty = isl_set_add_basic_set(sol->empty, isl_basic_set_copy(bset));
if (!sol->empty)
goto error;
isl_basic_set_free(bset);
sol_map_add_empty((struct isl_sol_map *)sol, bset);
}
+/* Add bset to sol's empty, but only if we are actually collecting
+ * the empty set.
+ */
+static void sol_map_add_empty_if_needed(struct isl_sol_map *sol,
+ struct isl_basic_set *bset)
+{
+ if (sol->empty)
+ sol_map_add_empty(sol, bset);
+ else
+ isl_basic_set_free(bset);
+}
+
/* Given a basic map "dom" that represents the context and an affine
* matrix "M" that maps the dimensions of the context to the
* output variables, construct a basic map with the same parameters
bmap = isl_basic_map_simplify(bmap);
bmap = isl_basic_map_finalize(bmap);
sol->map = isl_map_grow(sol->map, 1);
- sol->map = isl_map_add(sol->map, bmap);
+ sol->map = isl_map_add_basic_map(sol->map, bmap);
if (!sol->map)
goto error;
isl_basic_set_free(dom);
return tab;
while ((row = first_neg(tab)) != -1) {
col = lexmin_pivot_col(tab, row);
- if (col >= tab->n_col)
- return isl_tab_mark_empty(tab);
+ if (col >= tab->n_col) {
+ if (isl_tab_mark_empty(tab) < 0)
+ goto error;
+ return tab;
+ }
if (col < 0)
goto error;
if (isl_tab_pivot(tab, row, col) < 0)
row = tab->con[r1].index;
if (is_constant(tab, row)) {
if (!isl_int_is_zero(tab->mat->row[row][1]) ||
- (tab->M && !isl_int_is_zero(tab->mat->row[row][2])))
- return isl_tab_mark_empty(tab);
+ (tab->M && !isl_int_is_zero(tab->mat->row[row][2]))) {
+ if (isl_tab_mark_empty(tab) < 0)
+ goto error;
+ return tab;
+ }
if (isl_tab_rollback(tab, snap) < 0)
goto error;
return tab;
}
}
- if (tab->bset) {
- tab->bset = isl_basic_set_add_ineq(tab->bset, eq);
- if (isl_tab_push(tab, isl_tab_undo_bset_ineq) < 0)
+ if (tab->bmap) {
+ tab->bmap = isl_basic_map_add_ineq(tab->bmap, eq);
+ if (isl_tab_push(tab, isl_tab_undo_bmap_ineq) < 0)
goto error;
isl_seq_neg(eq, eq, 1 + tab->n_var);
- tab->bset = isl_basic_set_add_ineq(tab->bset, eq);
+ tab->bmap = isl_basic_map_add_ineq(tab->bmap, eq);
isl_seq_neg(eq, eq, 1 + tab->n_var);
- if (isl_tab_push(tab, isl_tab_undo_bset_ineq) < 0)
+ if (isl_tab_push(tab, isl_tab_undo_bmap_ineq) < 0)
goto error;
- if (!tab->bset)
+ if (!tab->bmap)
goto error;
}
if (!tab)
return NULL;
- if (tab->bset) {
- tab->bset = isl_basic_set_add_ineq(tab->bset, ineq);
- if (isl_tab_push(tab, isl_tab_undo_bset_ineq) < 0)
+ if (tab->bmap) {
+ tab->bmap = isl_basic_map_add_ineq(tab->bmap, ineq);
+ if (isl_tab_push(tab, isl_tab_undo_bmap_ineq) < 0)
goto error;
- if (!tab->bset)
+ if (!tab->bmap)
goto error;
}
r = isl_tab_add_row(tab, ineq);
#define I_PAR 1 << 1
#define I_VAR 1 << 2
-/* Check for first (non-parameter) variable that is non-integer and
- * therefore requires a cut.
+/* Check for next (non-parameter) variable after "var" (first if var == -1)
+ * that is non-integer and therefore requires a cut and return
+ * the index of the variable.
* For parametric tableaus, there are three parts in a row,
* the constant, the coefficients of the parameters and the rest.
* For each part, we check whether the coefficients in that part
* current sample value is integral and no cut is required
* (irrespective of whether the variable part is integral).
*/
-static int first_non_integer(struct isl_tab *tab, int *f)
+static int next_non_integer_var(struct isl_tab *tab, int var, int *f)
{
- int i;
+ var = var < 0 ? tab->n_param : var + 1;
- for (i = tab->n_param; i < tab->n_var - tab->n_div; ++i) {
+ for (; var < tab->n_var - tab->n_div; ++var) {
int flags = 0;
int row;
- if (!tab->var[i].is_row)
+ if (!tab->var[var].is_row)
continue;
- row = tab->var[i].index;
+ row = tab->var[var].index;
if (integer_constant(tab, row))
ISL_FL_SET(flags, I_CST);
if (integer_parameter(tab, row))
if (integer_variable(tab, row))
ISL_FL_SET(flags, I_VAR);
*f = flags;
- return row;
+ return var;
}
return -1;
}
+/* Check for first (non-parameter) variable that is non-integer and
+ * therefore requires a cut and return the corresponding row.
+ * For parametric tableaus, there are three parts in a row,
+ * the constant, the coefficients of the parameters and the rest.
+ * For each part, we check whether the coefficients in that part
+ * are all integral and if so, set the corresponding flag in *f.
+ * If the constant and the parameter part are integral, then the
+ * current sample value is integral and no cut is required
+ * (irrespective of whether the variable part is integral).
+ */
+static int first_non_integer_row(struct isl_tab *tab, int *f)
+{
+ int var = next_non_integer_var(tab, -1, f);
+
+ return var < 0 ? -1 : tab->var[var].index;
+}
+
/* Add a (non-parametric) cut to cut away the non-integral sample
* value of the given row.
*
* sample point is obtained or until the tableau is determined
* to be integer infeasible.
* As long as there is any non-integer value in the sample point,
- * we add an appropriate cut, if possible and resolve the violated
- * cut constraint using restore_lexmin.
+ * we add appropriate cuts, if possible, for each of these
+ * non-integer values and then resolve the violated
+ * cut constraints using restore_lexmin.
* If one of the corresponding rows is equal to an integral
* combination of variables/constraints plus a non-integral constant,
- * then there is no way to obtain an integer point an we return
+ * then there is no way to obtain an integer point and we return
* a tableau that is marked empty.
*/
static struct isl_tab *cut_to_integer_lexmin(struct isl_tab *tab)
{
+ int var;
int row;
int flags;
if (tab->empty)
return tab;
- while ((row = first_non_integer(tab, &flags)) != -1) {
- if (ISL_FL_ISSET(flags, I_VAR))
- return isl_tab_mark_empty(tab);
- row = add_cut(tab, row);
- if (row < 0)
- goto error;
+ while ((var = next_non_integer_var(tab, -1, &flags)) != -1) {
+ do {
+ if (ISL_FL_ISSET(flags, I_VAR)) {
+ if (isl_tab_mark_empty(tab) < 0)
+ goto error;
+ return tab;
+ }
+ row = tab->var[var].index;
+ row = add_cut(tab, row);
+ if (row < 0)
+ goto error;
+ } while ((var = next_non_integer_var(tab, var, &flags)) != -1);
tab = restore_lexmin(tab);
if (!tab || tab->empty)
break;
if (!tab)
return NULL;
- isl_assert(tab->mat->ctx, tab->bset, goto error);
+ isl_assert(tab->mat->ctx, tab->bmap, goto error);
isl_assert(tab->mat->ctx, tab->samples, goto error);
isl_assert(tab->mat->ctx, tab->samples->n_col == 1 + tab->n_var, goto error);
if (!tab)
return -1;
- isl_assert(tab->mat->ctx, tab->bset, return -1);
+ isl_assert(tab->mat->ctx, tab->bmap, return -1);
isl_assert(tab->mat->ctx, tab->samples, return -1);
isl_assert(tab->mat->ctx, tab->samples->n_col == 1 + tab->n_var, return -1);
samples->row[i][samples->n_col - 1], div->el[0]);
}
- tab->bset = isl_basic_set_extend_dim(tab->bset,
- isl_basic_set_get_dim(tab->bset), 1, 0, 2);
- k = isl_basic_set_alloc_div(tab->bset);
+ tab->bmap = isl_basic_map_extend_dim(tab->bmap,
+ isl_basic_map_get_dim(tab->bmap), 1, 0, 2);
+ k = isl_basic_map_alloc_div(tab->bmap);
if (k < 0)
return -1;
- isl_seq_cpy(tab->bset->div[k], div->el, div->size);
- if (isl_tab_push(tab, isl_tab_undo_bset_div) < 0)
+ isl_seq_cpy(tab->bmap->div[k], div->el, div->size);
+ if (isl_tab_push(tab, isl_tab_undo_bmap_div) < 0)
return -1;
return k;
static int find_div(struct isl_tab *tab, isl_int *div, isl_int denom)
{
int i;
- unsigned total = isl_basic_set_total_dim(tab->bset);
+ unsigned total = isl_basic_map_total_dim(tab->bmap);
- for (i = 0; i < tab->bset->n_div; ++i) {
- if (isl_int_ne(tab->bset->div[i][0], denom))
+ for (i = 0; i < tab->bmap->n_div; ++i) {
+ if (isl_int_ne(tab->bmap->div[i][0], denom))
continue;
- if (!isl_seq_eq(tab->bset->div[i] + 1, div, total))
+ if (!isl_seq_eq(tab->bmap->div[i] + 1, div, total))
continue;
return i;
}
if (!tab->row_sign)
goto error;
}
- if (ISL_F_ISSET(bmap, ISL_BASIC_MAP_EMPTY))
- return isl_tab_mark_empty(tab);
+ if (ISL_F_ISSET(bmap, ISL_BASIC_MAP_EMPTY)) {
+ if (isl_tab_mark_empty(tab) < 0)
+ goto error;
+ return tab;
+ }
for (i = tab->n_param; i < tab->n_var - tab->n_div; ++i) {
tab->var[i].is_nonneg = 1;
struct isl_tab_undo *snap2;
struct isl_vec *ineq = NULL;
int r = 0;
+ int ok;
if (!isl_tab_var_from_row(tab, split)->is_nonneg)
continue;
ineq = get_row_parameter_ineq(tab, split);
if (!ineq)
return -1;
- context_tab = isl_tab_add_ineq(context_tab, ineq->el);
+ ok = isl_tab_add_ineq(context_tab, ineq->el) >= 0;
isl_vec_free(ineq);
+ if (!ok)
+ return -1;
snap2 = isl_tab_snap(context_tab);
ineq = get_row_parameter_ineq(tab, row);
if (!ineq)
return -1;
- context_tab = isl_tab_add_ineq(context_tab, ineq->el);
+ ok = isl_tab_add_ineq(context_tab, ineq->el) >= 0;
isl_vec_free(ineq);
+ if (!ok)
+ return -1;
var = &context_tab->con[context_tab->n_con - 1];
if (!context_tab->empty &&
!isl_tab_min_at_most_neg_one(context_tab, var))
struct isl_context_lex *clex = (struct isl_context_lex *)context;
if (!clex->tab)
return NULL;
- return clex->tab->bset;
+ return isl_tab_peek_bset(clex->tab);
}
static struct isl_tab *context_lex_peek_tab(struct isl_context *context)
isl_seq_clr(ineq->el, ineq->size);
for (i = 0; i < context_tab->n_var; ++i) {
isl_int_set_si(ineq->el[1 + i], 1);
- context_tab = isl_tab_add_ineq(context_tab, ineq->el);
+ if (isl_tab_add_ineq(context_tab, ineq->el) < 0)
+ goto error;
var = &context_tab->con[context_tab->n_con - 1];
if (!context_tab->empty &&
!isl_tab_min_at_most_neg_one(context_tab, var)) {
tab = tab_for_lexmin((struct isl_basic_map *)bset, NULL, 1, 0);
if (!tab)
goto error;
- tab->bset = bset;
+ if (isl_tab_track_bset(tab, bset) < 0)
+ goto error;
tab = isl_tab_init_samples(tab);
return tab;
error:
struct isl_context_gbr *cgbr = (struct isl_context_gbr *)context;
if (!cgbr->tab)
return NULL;
- return cgbr->tab->bset;
+ return isl_tab_peek_bset(cgbr->tab);
}
static struct isl_tab *context_gbr_peek_tab(struct isl_context *context)
{
int i, j;
struct isl_vec *cst;
- struct isl_basic_set *bset = cgbr->tab->bset;
+ struct isl_basic_set *bset = isl_tab_peek_bset(cgbr->tab);
unsigned dim = isl_basic_set_total_dim(bset);
cst = isl_vec_alloc(cgbr->tab->mat->ctx, bset->n_ineq);
static int use_shifted(struct isl_context_gbr *cgbr)
{
- return cgbr->tab->bset->n_eq == 0 && cgbr->tab->bset->n_div == 0;
+ return cgbr->tab->bmap->n_eq == 0 && cgbr->tab->bmap->n_div == 0;
}
static struct isl_vec *gbr_get_sample(struct isl_context_gbr *cgbr)
}
if (!cgbr->cone) {
- cgbr->cone = isl_tab_from_recession_cone(cgbr->tab->bset);
+ bset = isl_tab_peek_bset(cgbr->tab);
+ cgbr->cone = isl_tab_from_recession_cone(bset);
if (!cgbr->cone)
return NULL;
- cgbr->cone->bset = isl_basic_set_dup(cgbr->tab->bset);
+ if (isl_tab_track_bset(cgbr->cone, isl_basic_set_dup(bset)) < 0)
+ return NULL;
}
cgbr->cone = isl_tab_detect_implicit_equalities(cgbr->cone);
if (!cgbr->cone)
return sample;
}
- cone = isl_basic_set_dup(cgbr->cone->bset);
+ cone = isl_basic_set_dup(isl_tab_peek_bset(cgbr->cone));
cone = drop_constant_terms(cone);
cone = isl_basic_set_update_from_tab(cone, cgbr->cone);
cone = isl_basic_set_underlying_set(cone);
cone = isl_basic_set_gauss(cone, NULL);
- bset = isl_basic_set_dup(cgbr->tab->bset);
+ bset = isl_basic_set_dup(isl_tab_peek_bset(cgbr->tab));
bset = isl_basic_set_update_from_tab(bset, cgbr->tab);
bset = isl_basic_set_underlying_set(bset);
bset = isl_basic_set_gauss(bset, NULL);
if (sample->size == 0) {
isl_vec_free(sample);
- cgbr->tab = isl_tab_mark_empty(cgbr->tab);
+ if (isl_tab_mark_empty(cgbr->tab) < 0)
+ goto error;
return;
}
if (isl_tab_extend_cons(cgbr->tab, 1) < 0)
goto error;
- cgbr->tab = isl_tab_add_ineq(cgbr->tab, ineq);
+ if (isl_tab_add_ineq(cgbr->tab, ineq) < 0)
+ goto error;
if (cgbr->shifted && !cgbr->shifted->empty && use_shifted(cgbr)) {
int i;
unsigned dim;
- dim = isl_basic_set_total_dim(cgbr->tab->bset);
+ dim = isl_basic_map_total_dim(cgbr->tab->bmap);
if (isl_tab_extend_cons(cgbr->shifted, 1) < 0)
goto error;
isl_int_add(ineq[0], ineq[0], ineq[1 + i]);
}
- cgbr->shifted = isl_tab_add_ineq(cgbr->shifted, ineq);
+ if (isl_tab_add_ineq(cgbr->shifted, ineq) < 0)
+ goto error;
for (i = 0; i < dim; ++i) {
if (!isl_int_is_neg(ineq[1 + i]))
if (cgbr->cone && cgbr->cone->n_col != cgbr->cone->n_dead) {
if (isl_tab_extend_cons(cgbr->cone, 1) < 0)
goto error;
- cgbr->cone = isl_tab_add_ineq(cgbr->cone, ineq);
+ if (isl_tab_add_ineq(cgbr->cone, ineq) < 0)
+ goto error;
}
return;
if (!eq)
goto error;
- if (isl_tab_extend_cons(tab, (cgbr->tab->bset->n_ineq - first)/2) < 0)
+ if (isl_tab_extend_cons(tab, (cgbr->tab->bmap->n_ineq - first)/2) < 0)
goto error;
isl_seq_clr(eq->el + 1 + tab->n_param,
tab->n_var - tab->n_param - tab->n_div);
- for (i = first; i < cgbr->tab->bset->n_ineq; i += 2) {
+ for (i = first; i < cgbr->tab->bmap->n_ineq; i += 2) {
int j;
int r;
struct isl_tab_undo *snap;
snap = isl_tab_snap(tab);
- isl_seq_cpy(eq->el, cgbr->tab->bset->ineq[i], 1 + tab->n_param);
+ isl_seq_cpy(eq->el, cgbr->tab->bmap->ineq[i], 1 + tab->n_param);
isl_seq_cpy(eq->el + 1 + tab->n_var - tab->n_div,
- cgbr->tab->bset->ineq[i] + 1 + tab->n_param,
+ cgbr->tab->bmap->ineq[i] + 1 + tab->n_param,
tab->n_div);
r = isl_tab_add_row(tab, eq->el);
ctx = cgbr->tab->mat->ctx;
if (!cgbr->cone) {
- cgbr->cone = isl_tab_from_recession_cone(cgbr->tab->bset);
+ struct isl_basic_set *bset = isl_tab_peek_bset(cgbr->tab);
+ cgbr->cone = isl_tab_from_recession_cone(bset);
if (!cgbr->cone)
goto error;
- cgbr->cone->bset = isl_basic_set_dup(cgbr->tab->bset);
+ if (isl_tab_track_bset(cgbr->cone, isl_basic_set_dup(bset)) < 0)
+ goto error;
}
cgbr->cone = isl_tab_detect_implicit_equalities(cgbr->cone);
- n_ineq = cgbr->tab->bset->n_ineq;
+ n_ineq = cgbr->tab->bmap->n_ineq;
cgbr->tab = isl_tab_detect_equalities(cgbr->tab, cgbr->cone);
- if (cgbr->tab && cgbr->tab->bset->n_ineq > n_ineq)
+ if (cgbr->tab && cgbr->tab->bmap->n_ineq > n_ineq)
propagate_equalities(cgbr, tab, n_ineq);
return 0;
if (isl_tab_allocate_var(cgbr->cone) <0)
return -1;
- cgbr->cone->bset = isl_basic_set_extend_dim(cgbr->cone->bset,
- isl_basic_set_get_dim(cgbr->cone->bset), 1, 0, 2);
- k = isl_basic_set_alloc_div(cgbr->cone->bset);
+ cgbr->cone->bmap = isl_basic_map_extend_dim(cgbr->cone->bmap,
+ isl_basic_map_get_dim(cgbr->cone->bmap), 1, 0, 2);
+ k = isl_basic_map_alloc_div(cgbr->cone->bmap);
if (k < 0)
return -1;
- isl_seq_cpy(cgbr->cone->bset->div[k], div->el, div->size);
- if (isl_tab_push(cgbr->cone, isl_tab_undo_bset_div) < 0)
+ isl_seq_cpy(cgbr->cone->bmap->div[k], div->el, div->size);
+ if (isl_tab_push(cgbr->cone, isl_tab_undo_bmap_div) < 0)
return -1;
}
return context_tab_add_div(cgbr->tab, div, nonneg);
cgbr->tab = isl_tab_init_samples(cgbr->tab);
if (!cgbr->tab)
goto error;
- cgbr->tab->bset = isl_basic_set_cow(isl_basic_set_copy(dom));
- if (!cgbr->tab->bset)
+ if (isl_tab_track_bset(cgbr->tab,
+ isl_basic_set_cow(isl_basic_set_copy(dom))) < 0)
goto error;
check_gbr_integer_feasible(cgbr);
}
if (tab->rational)
break;
- row = first_non_integer(tab, &flags);
+ row = first_non_integer_row(tab, &flags);
if (row < 0)
break;
if (ISL_FL_ISSET(flags, I_PAR)) {
if (ISL_FL_ISSET(flags, I_VAR)) {
- tab = isl_tab_mark_empty(tab);
+ if (isl_tab_mark_empty(tab) < 0)
+ goto error;
break;
}
row = add_cut(tab, row);
if (sol->error || !context->op->is_ok(context))
goto error;
tab = set_row_cst_to_div(tab, row, d);
+ if (context->op->is_empty(context))
+ break;
} else
row = add_parametric_cut(tab, row, context);
if (row < 0)
if (isl_basic_set_fast_is_empty(context->op->peek_basic_set(context)))
/* nothing */;
else if (isl_basic_map_fast_is_empty(bmap))
- sol_map_add_empty(sol_map,
- isl_basic_set_dup(context->op->peek_basic_set(context)));
+ sol_map_add_empty_if_needed(sol_map,
+ isl_basic_set_copy(context->op->peek_basic_set(context)));
else {
tab = tab_for_lexmin(bmap,
context->op->peek_basic_set(context), 1, max);
projects / platform / upstream / isl.git / blobdiff