tab->empty = 0;
tab->in_undo = 0;
tab->M = M;
+ tab->cone = 0;
tab->bottom.type = isl_tab_undo_bottom;
tab->bottom.next = NULL;
tab->top = &tab->bottom;
dup->need_undo = 0;
dup->in_undo = 0;
dup->M = tab->M;
+ tab->cone = tab->cone;
dup->bottom.type = isl_tab_undo_bottom;
dup->bottom.next = NULL;
dup->top = &dup->bottom;
isl_assert(tab1->mat->ctx, tab1->M == tab2->M, return NULL);
isl_assert(tab1->mat->ctx, tab1->rational == tab2->rational, return NULL);
+ isl_assert(tab1->mat->ctx, tab1->cone == tab2->cone, return NULL);
isl_assert(tab1->mat->ctx, !tab1->row_sign, return NULL);
isl_assert(tab1->mat->ctx, !tab2->row_sign, return NULL);
isl_assert(tab1->mat->ctx, tab1->n_param == 0, return NULL);
prod->need_undo = 0;
prod->in_undo = 0;
prod->M = tab1->M;
+ prod->cone = tab1->cone;
prod->bottom.type = isl_tab_undo_bottom;
prod->bottom.next = NULL;
prod->top = &prod->bottom;
tab->row_sign[row2] = t;
}
-static void push_union(struct isl_tab *tab,
+static int push_union(struct isl_tab *tab,
+ enum isl_tab_undo_type type, union isl_tab_undo_val u) WARN_UNUSED;
+static int push_union(struct isl_tab *tab,
enum isl_tab_undo_type type, union isl_tab_undo_val u)
{
struct isl_tab_undo *undo;
if (!tab->need_undo)
- return;
+ return 0;
undo = isl_alloc_type(tab->mat->ctx, struct isl_tab_undo);
- if (!undo) {
- free_undo(tab);
- tab->top = NULL;
- return;
- }
+ if (!undo)
+ return -1;
undo->type = type;
undo->u = u;
undo->next = tab->top;
tab->top = undo;
+
+ return 0;
}
-void isl_tab_push_var(struct isl_tab *tab,
+int isl_tab_push_var(struct isl_tab *tab,
enum isl_tab_undo_type type, struct isl_tab_var *var)
{
union isl_tab_undo_val u;
u.var_index = tab->row_var[var->index];
else
u.var_index = tab->col_var[var->index];
- push_union(tab, type, u);
+ return push_union(tab, type, u);
}
-void isl_tab_push(struct isl_tab *tab, enum isl_tab_undo_type type)
+int isl_tab_push(struct isl_tab *tab, enum isl_tab_undo_type type)
{
union isl_tab_undo_val u = { 0 };
- push_union(tab, type, u);
+ return push_union(tab, type, u);
}
/* Push a record on the undo stack describing the current basic
* variables, so that the this state can be restored during rollback.
*/
-void isl_tab_push_basis(struct isl_tab *tab)
+int isl_tab_push_basis(struct isl_tab *tab)
{
int i;
union isl_tab_undo_val u;
u.col_var = isl_alloc_array(tab->mat->ctx, int, tab->n_col);
- if (!u.col_var) {
- free_undo(tab);
- tab->top = NULL;
- return;
- }
+ if (!u.col_var)
+ return -1;
for (i = 0; i < tab->n_col; ++i)
u.col_var[i] = tab->col_var[i];
- push_union(tab, isl_tab_undo_saved_basis, u);
+ return push_union(tab, isl_tab_undo_saved_basis, u);
+}
+
+int isl_tab_push_callback(struct isl_tab *tab, struct isl_tab_callback *callback)
+{
+ union isl_tab_undo_val u;
+ u.callback = callback;
+ return push_union(tab, isl_tab_undo_callback, u);
}
struct isl_tab *isl_tab_init_samples(struct isl_tab *tab)
isl_mat_swap_rows(tab->samples, tab->n_outside, s);
}
tab->n_outside++;
- isl_tab_push(tab, isl_tab_undo_drop_sample);
+ if (isl_tab_push(tab, isl_tab_undo_drop_sample) < 0) {
+ isl_tab_free(tab);
+ return NULL;
+ }
return tab;
}
/* Record the current number of samples so that we can remove newer
* samples during a rollback.
*/
-void isl_tab_save_samples(struct isl_tab *tab)
+int isl_tab_save_samples(struct isl_tab *tab)
{
union isl_tab_undo_val u;
if (!tab)
- return;
+ return -1;
u.n = tab->n_sample;
- push_union(tab, isl_tab_undo_saved_samples, u);
+ return push_union(tab, isl_tab_undo_saved_samples, u);
}
/* Mark row with index "row" as being redundant.
if (tab->need_undo || tab->row_var[row] >= 0) {
if (tab->row_var[row] >= 0 && !var->is_nonneg) {
var->is_nonneg = 1;
- isl_tab_push_var(tab, isl_tab_undo_nonneg, var);
+ if (isl_tab_push_var(tab, isl_tab_undo_nonneg, var) < 0)
+ return -1;
}
if (row != tab->n_redundant)
swap_rows(tab, row, tab->n_redundant);
- isl_tab_push_var(tab, isl_tab_undo_redundant, var);
tab->n_redundant++;
- return 0;
+ return isl_tab_push_var(tab, isl_tab_undo_redundant, var);
} else {
if (row != tab->n_row - 1)
swap_rows(tab, row, tab->n_row - 1);
struct isl_tab *isl_tab_mark_empty(struct isl_tab *tab)
{
+ if (!tab)
+ return NULL;
if (!tab->empty && tab->need_undo)
- isl_tab_push(tab, isl_tab_undo_empty);
+ if (isl_tab_push(tab, isl_tab_undo_empty) < 0) {
+ isl_tab_free(tab);
+ return NULL;
+ }
tab->empty = 1;
return tab;
}
* s(n_rc)d_r n_jc/(|n_rc| d_j) (n_ji |n_rc| - s(n_rc)n_jc n_ri)/(|n_rc| d_j)
*
*/
-void isl_tab_pivot(struct isl_tab *tab, int row, int col)
+int isl_tab_pivot(struct isl_tab *tab, int row, int col)
{
int i, j;
int sgn;
var->index = col;
update_row_sign(tab, row, col, sgn);
if (tab->in_undo)
- return;
+ return 0;
for (i = tab->n_redundant; i < tab->n_row; ++i) {
if (isl_int_is_zero(mat->row[i][off + col]))
continue;
if (!isl_tab_var_from_row(tab, i)->frozen &&
- isl_tab_row_is_redundant(tab, i))
- if (isl_tab_mark_redundant(tab, i))
+ isl_tab_row_is_redundant(tab, i)) {
+ int redo = isl_tab_mark_redundant(tab, i);
+ if (redo < 0)
+ return -1;
+ if (redo)
--i;
+ }
}
+ return 0;
}
/* If "var" represents a column variable, then pivot is up (sgn > 0)
* If sgn = 0, then the variable is unbounded in both directions,
* and we pivot with any row we can find.
*/
-static void to_row(struct isl_tab *tab, struct isl_tab_var *var, int sign)
+static int to_row(struct isl_tab *tab, struct isl_tab_var *var, int sign) WARN_UNUSED;
+static int to_row(struct isl_tab *tab, struct isl_tab_var *var, int sign)
{
int r;
unsigned off = 2 + tab->M;
if (var->is_row)
- return;
+ return 0;
if (sign == 0) {
for (r = tab->n_redundant; r < tab->n_row; ++r)
if (!isl_int_is_zero(tab->mat->row[r][off+var->index]))
break;
- isl_assert(tab->mat->ctx, r < tab->n_row, return);
+ isl_assert(tab->mat->ctx, r < tab->n_row, return -1);
} else {
r = pivot_row(tab, NULL, sign, var->index);
- isl_assert(tab->mat->ctx, r >= 0, return);
+ isl_assert(tab->mat->ctx, r >= 0, return -1);
}
- isl_tab_pivot(tab, r, var->index);
+ return isl_tab_pivot(tab, r, var->index);
}
static void check_table(struct isl_tab *tab)
if (max_is_manifestly_unbounded(tab, var))
return 1;
- to_row(tab, var, 1);
+ if (to_row(tab, var, 1) < 0)
+ return -2;
while (!isl_int_is_pos(tab->mat->row[var->index][1])) {
find_pivot(tab, var, var, 1, &row, &col);
if (row == -1)
return isl_int_sgn(tab->mat->row[var->index][1]);
- isl_tab_pivot(tab, row, col);
+ if (isl_tab_pivot(tab, row, col) < 0)
+ return -2;
if (!var->is_row) /* manifestly unbounded */
return 1;
}
find_pivot(tab, var, var, 1, &row, &col);
if (row == -1)
break;
- isl_tab_pivot(tab, row, col);
+ if (isl_tab_pivot(tab, row, col) < 0)
+ return -2;
if (!var->is_row) /* manifestly unbounded */
return 1;
}
break;
if (row == var->index) /* manifestly unbounded */
return 1;
- isl_tab_pivot(tab, row, col);
+ if (isl_tab_pivot(tab, row, col) < 0)
+ return -1;
}
return !isl_int_is_neg(tab->mat->row[var->index][1]);
}
col = var->index;
row = pivot_row(tab, NULL, -1, col);
pivot_var = var_from_col(tab, col);
- isl_tab_pivot(tab, row, col);
+ if (isl_tab_pivot(tab, row, col) < 0)
+ return -2;
if (var->is_redundant)
return 0;
if (isl_int_is_neg(tab->mat->row[var->index][1])) {
if (var->is_nonneg) {
if (!pivot_var->is_redundant &&
- pivot_var->index == row)
- isl_tab_pivot(tab, row, col);
- else
- restore_row(tab, var);
+ pivot_var->index == row) {
+ if (isl_tab_pivot(tab, row, col) < 0)
+ return -2;
+ } else
+ if (restore_row(tab, var) < -1)
+ return -2;
}
return -1;
}
if (row == -1)
return isl_int_sgn(tab->mat->row[var->index][1]);
pivot_var = var_from_col(tab, col);
- isl_tab_pivot(tab, row, col);
+ if (isl_tab_pivot(tab, row, col) < 0)
+ return -2;
if (var->is_redundant)
return 0;
}
if (pivot_var && var->is_nonneg) {
/* pivot back to non-negative value */
- if (!pivot_var->is_redundant && pivot_var->index == row)
- isl_tab_pivot(tab, row, col);
- else
- restore_row(tab, var);
+ if (!pivot_var->is_redundant && pivot_var->index == row) {
+ if (isl_tab_pivot(tab, row, col) < 0)
+ return -2;
+ } else
+ if (restore_row(tab, var) < -1)
+ return -2;
}
return -1;
}
col = var->index;
row = pivot_row(tab, NULL, -1, col);
pivot_var = var_from_col(tab, col);
- isl_tab_pivot(tab, row, col);
+ if (isl_tab_pivot(tab, row, col) < 0)
+ return -1;
if (var->is_redundant)
return 0;
if (row_at_most_neg_one(tab, var->index)) {
if (var->is_nonneg) {
if (!pivot_var->is_redundant &&
- pivot_var->index == row)
- isl_tab_pivot(tab, row, col);
- else
- restore_row(tab, var);
+ pivot_var->index == row) {
+ if (isl_tab_pivot(tab, row, col) < 0)
+ return -1;
+ } else
+ if (restore_row(tab, var) < -1)
+ return -1;
}
return 1;
}
if (row == -1)
return 0;
pivot_var = var_from_col(tab, col);
- isl_tab_pivot(tab, row, col);
+ if (isl_tab_pivot(tab, row, col) < 0)
+ return -1;
if (var->is_redundant)
return 0;
} while (!row_at_most_neg_one(tab, var->index));
if (var->is_nonneg) {
/* pivot back to non-negative value */
if (!pivot_var->is_redundant && pivot_var->index == row)
- isl_tab_pivot(tab, row, col);
- restore_row(tab, var);
+ if (isl_tab_pivot(tab, row, col) < 0)
+ return -1;
+ if (restore_row(tab, var) < -1)
+ return -1;
}
return 1;
}
if (max_is_manifestly_unbounded(tab, var))
return 1;
- to_row(tab, var, 1);
+ if (to_row(tab, var, 1) < 0)
+ return -1;
r = tab->mat->row[var->index];
while (isl_int_lt(r[1], r[0])) {
find_pivot(tab, var, var, 1, &row, &col);
return isl_int_ge(r[1], r[0]);
if (row == var->index) /* manifestly unbounded */
return 1;
- isl_tab_pivot(tab, row, col);
+ if (isl_tab_pivot(tab, row, col) < 0)
+ return -1;
}
return 1;
}
{
var_from_col(tab, col)->is_zero = 1;
if (tab->need_undo) {
- isl_tab_push_var(tab, isl_tab_undo_zero, var_from_col(tab, col));
+ if (isl_tab_push_var(tab, isl_tab_undo_zero,
+ var_from_col(tab, col)) < 0)
+ return -1;
if (col != tab->n_dead)
swap_cols(tab, col, tab->n_dead);
tab->n_dead++;
* then also be written as the negative sum of non-negative variables
* and must therefore also be zero.
*/
-static void close_row(struct isl_tab *tab, struct isl_tab_var *var)
+static int close_row(struct isl_tab *tab, struct isl_tab_var *var) WARN_UNUSED;
+static int close_row(struct isl_tab *tab, struct isl_tab_var *var)
{
int j;
struct isl_mat *mat = tab->mat;
unsigned off = 2 + tab->M;
- isl_assert(tab->mat->ctx, var->is_nonneg, return);
+ isl_assert(tab->mat->ctx, var->is_nonneg, return -1);
var->is_zero = 1;
if (tab->need_undo)
- isl_tab_push_var(tab, isl_tab_undo_zero, var);
+ if (isl_tab_push_var(tab, isl_tab_undo_zero, var) < 0)
+ return -1;
for (j = tab->n_dead; j < tab->n_col; ++j) {
if (isl_int_is_zero(mat->row[var->index][off + j]))
continue;
isl_assert(tab->mat->ctx,
- isl_int_is_neg(mat->row[var->index][off + j]), return);
+ isl_int_is_neg(mat->row[var->index][off + j]), return -1);
if (isl_tab_kill_col(tab, j))
--j;
}
- isl_tab_mark_redundant(tab, var->index);
+ if (isl_tab_mark_redundant(tab, var->index) < 0)
+ return -1;
+ return 0;
}
/* Add a constraint to the tableau and allocate a row for it.
tab->n_row++;
tab->n_con++;
- isl_tab_push_var(tab, isl_tab_undo_allocate, &tab->con[r]);
+ if (isl_tab_push_var(tab, isl_tab_undo_allocate, &tab->con[r]) < 0)
+ return -1;
return r;
}
tab->n_var++;
tab->n_col++;
- isl_tab_push_var(tab, isl_tab_undo_allocate, &tab->var[r]);
+ if (isl_tab_push_var(tab, isl_tab_undo_allocate, &tab->var[r]) < 0)
+ return -1;
return r;
}
{
int r;
int sgn;
+ isl_int cst;
if (!tab)
return NULL;
isl_assert(tab->mat->ctx,
tab->n_con == bset->n_eq + bset->n_ineq, goto error);
tab->bset = isl_basic_set_add_ineq(tab->bset, ineq);
- isl_tab_push(tab, isl_tab_undo_bset_ineq);
+ if (isl_tab_push(tab, isl_tab_undo_bset_ineq) < 0)
+ goto error;
if (!tab->bset)
goto error;
}
+ if (tab->cone) {
+ isl_int_init(cst);
+ isl_int_swap(ineq[0], cst);
+ }
r = isl_tab_add_row(tab, ineq);
+ if (tab->cone) {
+ isl_int_swap(ineq[0], cst);
+ isl_int_clear(cst);
+ }
if (r < 0)
goto error;
tab->con[r].is_nonneg = 1;
- isl_tab_push_var(tab, isl_tab_undo_nonneg, &tab->con[r]);
+ if (isl_tab_push_var(tab, isl_tab_undo_nonneg, &tab->con[r]) < 0)
+ goto error;
if (isl_tab_row_is_redundant(tab, tab->con[r].index)) {
- isl_tab_mark_redundant(tab, tab->con[r].index);
+ if (isl_tab_mark_redundant(tab, tab->con[r].index) < 0)
+ goto error;
return tab;
}
sgn = restore_row(tab, &tab->con[r]);
+ if (sgn < -1)
+ goto error;
if (sgn < 0)
return isl_tab_mark_empty(tab);
if (tab->con[r].is_row && isl_tab_row_is_redundant(tab, tab->con[r].index))
- isl_tab_mark_redundant(tab, tab->con[r].index);
+ if (isl_tab_mark_redundant(tab, tab->con[r].index) < 0)
+ goto error;
return tab;
error:
isl_tab_free(tab);
/* Pivot a non-negative variable down until it reaches the value zero
* and then pivot the variable into a column position.
*/
+static int to_col(struct isl_tab *tab, struct isl_tab_var *var) WARN_UNUSED;
static int to_col(struct isl_tab *tab, struct isl_tab_var *var)
{
int i;
while (isl_int_is_pos(tab->mat->row[var->index][1])) {
find_pivot(tab, var, NULL, -1, &row, &col);
isl_assert(tab->mat->ctx, row != -1, return -1);
- isl_tab_pivot(tab, row, col);
+ if (isl_tab_pivot(tab, row, col) < 0)
+ return -1;
if (!var->is_row)
return 0;
}
break;
isl_assert(tab->mat->ctx, i < tab->n_col, return -1);
- isl_tab_pivot(tab, var->index, i);
+ if (isl_tab_pivot(tab, var->index, i) < 0)
+ return -1;
return 0;
}
tab->n_col - tab->n_dead);
isl_assert(tab->mat->ctx, i >= 0, goto error);
i += tab->n_dead;
- isl_tab_pivot(tab, r, i);
- isl_tab_kill_col(tab, i);
+ if (isl_tab_pivot(tab, r, i) < 0)
+ goto error;
+ if (isl_tab_kill_col(tab, i) < 0)
+ goto error;
tab->n_eq++;
return tab;
r = var->index;
if (row_is_manifestly_zero(tab, r)) {
var->is_zero = 1;
- isl_tab_mark_redundant(tab, r);
+ if (isl_tab_mark_redundant(tab, r) < 0)
+ goto error;
return tab;
}
if (to_col(tab, var) < 0)
goto error;
var->is_nonneg = 0;
- isl_tab_kill_col(tab, var->index);
+ if (isl_tab_kill_col(tab, var->index) < 0)
+ goto error;
return tab;
error:
int r;
int row;
int sgn;
+ isl_int cst;
if (!tab)
return NULL;
if (tab->need_undo)
snap = isl_tab_snap(tab);
+ if (tab->cone) {
+ isl_int_init(cst);
+ isl_int_swap(eq[0], cst);
+ }
r = isl_tab_add_row(tab, eq);
+ if (tab->cone) {
+ isl_int_swap(eq[0], cst);
+ isl_int_clear(cst);
+ }
if (r < 0)
goto error;
if (tab->bset) {
tab->bset = isl_basic_set_add_ineq(tab->bset, eq);
- isl_tab_push(tab, isl_tab_undo_bset_ineq);
+ if (isl_tab_push(tab, isl_tab_undo_bset_ineq) < 0)
+ goto error;
isl_seq_neg(eq, eq, 1 + tab->n_var);
tab->bset = isl_basic_set_add_ineq(tab->bset, eq);
isl_seq_neg(eq, eq, 1 + tab->n_var);
- isl_tab_push(tab, isl_tab_undo_bset_ineq);
+ if (isl_tab_push(tab, isl_tab_undo_bset_ineq) < 0)
+ goto error;
if (!tab->bset)
goto error;
if (add_zero_row(tab) < 0)
sgn = -1;
}
- if (sgn < 0 && sign_of_max(tab, var) < 0)
- return isl_tab_mark_empty(tab);
+ if (sgn < 0) {
+ sgn = sign_of_max(tab, var);
+ if (sgn < -1)
+ goto error;
+ if (sgn < 0)
+ return isl_tab_mark_empty(tab);
+ }
var->is_nonneg = 1;
if (to_col(tab, var) < 0)
goto error;
var->is_nonneg = 0;
- isl_tab_kill_col(tab, var->index);
+ if (isl_tab_kill_col(tab, var->index) < 0)
+ goto error;
return tab;
error:
if (!tab)
return NULL;
tab->rational = ISL_F_ISSET(bset, ISL_BASIC_SET_RATIONAL);
+ tab->cone = 1;
isl_int_init(cst);
for (i = 0; i < bset->n_eq; ++i) {
if (r < 0)
goto error;
tab->con[r].is_nonneg = 1;
- isl_tab_push_var(tab, isl_tab_undo_nonneg, &tab->con[r]);
+ if (isl_tab_push_var(tab, isl_tab_undo_nonneg, &tab->con[r]) < 0)
+ goto error;
}
done:
isl_int_clear(cst);
for (;;) {
for (i = tab->n_redundant; i < tab->n_row; ++i) {
struct isl_tab_var *var;
+ int sgn;
var = isl_tab_var_from_row(tab, i);
if (!var->is_nonneg)
continue;
- if (sign_of_max(tab, var) != 0)
+ sgn = sign_of_max(tab, var);
+ if (sgn < -1)
+ return -1;
+ if (sgn != 0)
return 0;
- close_row(tab, var);
+ if (close_row(tab, var) < 0)
+ return -1;
break;
}
if (tab->n_dead == tab->n_col)
tab->n_row++;
tab->n_con++;
- isl_tab_push_var(tab, isl_tab_undo_allocate, &tab->con[r]);
+ if (isl_tab_push_var(tab, isl_tab_undo_allocate, &tab->con[r]) < 0)
+ goto error;
sgn = sign_of_max(tab, &tab->con[r]);
+ if (sgn < -1)
+ goto error;
if (sgn < 0)
return isl_tab_mark_empty(tab);
tab->con[r].is_nonneg = 1;
- isl_tab_push_var(tab, isl_tab_undo_nonneg, &tab->con[r]);
+ if (isl_tab_push_var(tab, isl_tab_undo_nonneg, &tab->con[r]) < 0)
+ goto error;
/* sgn == 0 */
- close_row(tab, &tab->con[r]);
+ if (close_row(tab, &tab->con[r]) < 0)
+ goto error;
return tab;
error:
var = &tab->con[con];
if (!var->is_row && !max_is_manifestly_unbounded(tab, var))
- to_row(tab, var, 1);
+ if (to_row(tab, var, 1) < 0)
+ goto error;
if (var->is_row)
isl_int_add(tab->mat->row[var->index][1],
}
- isl_tab_push_var(tab, isl_tab_undo_relax, var);
+ if (isl_tab_push_var(tab, isl_tab_undo_relax, var) < 0)
+ goto error;
return tab;
+error:
+ isl_tab_free(tab);
+ return NULL;
}
struct isl_tab *isl_tab_select_facet(struct isl_tab *tab, int con)
}
while (n_marked) {
struct isl_tab_var *var;
+ int sgn;
for (i = tab->n_redundant; i < tab->n_row; ++i) {
var = isl_tab_var_from_row(tab, i);
if (var->marked)
}
var->marked = 0;
n_marked--;
- if (sign_of_max(tab, var) == 0)
- close_row(tab, var);
- else if (!tab->rational && !at_least_one(tab, var)) {
+ sgn = sign_of_max(tab, var);
+ if (sgn < 0)
+ goto error;
+ if (sgn == 0) {
+ if (close_row(tab, var) < 0)
+ goto error;
+ } else if (!tab->rational && !at_least_one(tab, var)) {
tab = cut_to_hyperplane(tab, var);
return isl_tab_detect_implicit_equalities(tab);
}
}
return tab;
+error:
+ isl_tab_free(tab);
+ return NULL;
+}
+
+static int con_is_redundant(struct isl_tab *tab, struct isl_tab_var *var)
+{
+ if (!tab)
+ return -1;
+ if (tab->rational) {
+ int sgn = sign_of_min(tab, var);
+ if (sgn < -1)
+ return -1;
+ return sgn >= 0;
+ } else {
+ int irred = isl_tab_min_at_most_neg_one(tab, var);
+ if (irred < 0)
+ return -1;
+ return !irred;
+ }
}
/* Check for (near) redundant constraints.
}
while (n_marked) {
struct isl_tab_var *var;
+ int red;
for (i = tab->n_redundant; i < tab->n_row; ++i) {
var = isl_tab_var_from_row(tab, i);
if (var->marked)
}
var->marked = 0;
n_marked--;
- if ((tab->rational ? (sign_of_min(tab, var) >= 0)
- : !isl_tab_min_at_most_neg_one(tab, var)) &&
- !var->is_redundant)
- isl_tab_mark_redundant(tab, var->index);
+ red = con_is_redundant(tab, var);
+ if (red < 0)
+ goto error;
+ if (red && !var->is_redundant)
+ if (isl_tab_mark_redundant(tab, var->index) < 0)
+ goto error;
for (i = tab->n_dead; i < tab->n_col; ++i) {
var = var_from_col(tab, i);
if (!var->marked)
}
return tab;
+error:
+ isl_tab_free(tab);
+ return NULL;
}
int isl_tab_is_equality(struct isl_tab *tab, int con)
}
if (row == -1)
break;
- isl_tab_pivot(tab, row, col);
+ if (isl_tab_pivot(tab, row, col) < 0)
+ return isl_lp_error;
}
if (ISL_FL_ISSET(flags, ISL_TAB_SAVE_DUAL)) {
int i;
/* Undo the operation performed by isl_tab_relax.
*/
-static void unrelax(struct isl_tab *tab, struct isl_tab_var *var)
+static int unrelax(struct isl_tab *tab, struct isl_tab_var *var) WARN_UNUSED;
+static int unrelax(struct isl_tab *tab, struct isl_tab_var *var)
{
unsigned off = 2 + tab->M;
if (!var->is_row && !max_is_manifestly_unbounded(tab, var))
- to_row(tab, var, 1);
+ if (to_row(tab, var, 1) < 0)
+ return -1;
if (var->is_row)
isl_int_sub(tab->mat->row[var->index][1],
}
}
+
+ return 0;
}
-static void perform_undo_var(struct isl_tab *tab, struct isl_tab_undo *undo)
+static int perform_undo_var(struct isl_tab *tab, struct isl_tab_undo *undo) WARN_UNUSED;
+static int perform_undo_var(struct isl_tab *tab, struct isl_tab_undo *undo)
{
struct isl_tab_var *var = var_from_index(tab, undo->u.var_index);
switch(undo->type) {
break;
case isl_tab_undo_allocate:
if (undo->u.var_index >= 0) {
- isl_assert(tab->mat->ctx, !var->is_row, return);
+ isl_assert(tab->mat->ctx, !var->is_row, return -1);
drop_col(tab, var->index);
break;
}
if (!var->is_row) {
- if (!max_is_manifestly_unbounded(tab, var))
- to_row(tab, var, 1);
- else if (!min_is_manifestly_unbounded(tab, var))
- to_row(tab, var, -1);
- else
- to_row(tab, var, 0);
+ if (!max_is_manifestly_unbounded(tab, var)) {
+ if (to_row(tab, var, 1) < 0)
+ return -1;
+ } else if (!min_is_manifestly_unbounded(tab, var)) {
+ if (to_row(tab, var, -1) < 0)
+ return -1;
+ } else
+ if (to_row(tab, var, 0) < 0)
+ return -1;
}
drop_row(tab, var->index);
break;
case isl_tab_undo_relax:
- unrelax(tab, var);
- break;
+ return unrelax(tab, var);
}
+
+ return 0;
}
/* Restore the tableau to the state where the basic variables
if (!isl_int_is_zero(tab->mat->row[row][off+extra[j]]))
break;
isl_assert(tab->mat->ctx, j < n_extra, goto error);
- isl_tab_pivot(tab, row, extra[j]);
+ if (isl_tab_pivot(tab, row, extra[j]) < 0)
+ goto error;
extra[j] = extra[--n_extra];
}
* that were added since we saved this number of samples in
* isl_tab_save_samples.
*/
-static int drop_samples_since(struct isl_tab *tab, int n)
+static void drop_samples_since(struct isl_tab *tab, int n)
{
int i;
}
}
+static int perform_undo(struct isl_tab *tab, struct isl_tab_undo *undo) WARN_UNUSED;
static int perform_undo(struct isl_tab *tab, struct isl_tab_undo *undo)
{
switch (undo->type) {
case isl_tab_undo_zero:
case isl_tab_undo_allocate:
case isl_tab_undo_relax:
- perform_undo_var(tab, undo);
- break;
+ return perform_undo_var(tab, undo);
case isl_tab_undo_bset_eq:
- isl_basic_set_free_equality(tab->bset, 1);
- break;
+ return isl_basic_set_free_equality(tab->bset, 1);
case isl_tab_undo_bset_ineq:
- isl_basic_set_free_inequality(tab->bset, 1);
- break;
+ return isl_basic_set_free_inequality(tab->bset, 1);
case isl_tab_undo_bset_div:
- isl_basic_set_free_div(tab->bset, 1);
+ if (isl_basic_set_free_div(tab->bset, 1) < 0)
+ return -1;
if (tab->samples)
tab->samples->n_col--;
break;
case isl_tab_undo_saved_samples:
drop_samples_since(tab, undo->u.n);
break;
+ case isl_tab_undo_callback:
+ return undo->u.callback->run(undo->u.callback);
default:
isl_assert(tab->mat->ctx, 0, return -1);
}
(tab->rational ||
isl_int_abs_ge(tab->mat->row[row][1],
tab->mat->row[row][0]))) {
- if (at_least_zero(tab, &tab->con[con]))
+ int nonneg = at_least_zero(tab, &tab->con[con]);
+ if (nonneg < 0)
+ goto error;
+ if (nonneg)
type = isl_ineq_cut;
else
type = separation_type(tab, row);
- } else if (tab->rational ? (sign_of_min(tab, &tab->con[con]) < 0)
- : isl_tab_min_at_most_neg_one(tab, &tab->con[con]))
- type = isl_ineq_cut;
- else
- type = isl_ineq_redundant;
+ } else {
+ int red = con_is_redundant(tab, &tab->con[con]);
+ if (red < 0)
+ goto error;
+ if (!red)
+ type = isl_ineq_cut;
+ else
+ type = isl_ineq_redundant;
+ }
if (isl_tab_rollback(tab, snap))
return isl_ineq_error;
return type;
error:
- isl_tab_rollback(tab, snap);
return isl_ineq_error;
}
projects / platform / upstream / isl.git / blobdiff