X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=isl_tab.c;h=097b335c102c1f5108f912f242b21d595a427e43;hb=df17c511ad4492bfa3aa164b4488d9f857888b13;hp=5151ab61761b90ef1bf0e38af9148253e7a357a1;hpb=401775104e7d62116e6b8521d3ba1b789764732f;p=platform%2Fupstream%2Fisl.git

diff --git a/isl_tab.c b/isl_tab.c
index 5151ab6..097b335 100644
--- a/isl_tab.c
+++ b/isl_tab.c
@@ -939,7 +939,7 @@ int isl_tab_mark_redundant(struct isl_tab *tab, int row)
 	struct isl_tab_var *var = isl_tab_var_from_row(tab, row);
 	var->is_redundant = 1;
 	isl_assert(tab->mat->ctx, row >= tab->n_redundant, return -1);
-	if (tab->need_undo || tab->row_var[row] >= 0) {
+	if (tab->preserve || tab->need_undo || tab->row_var[row] >= 0) {
 		if (tab->row_var[row] >= 0 && !var->is_nonneg) {
 			var->is_nonneg = 1;
 			if (isl_tab_push_var(tab, isl_tab_undo_nonneg, var) < 0)
@@ -2184,8 +2184,8 @@ int isl_tab_add_div(struct isl_tab *tab, __isl_keep isl_vec *div,
 	if (nonneg)
 		tab->var[r].is_nonneg = 1;
 
-	tab->bmap = isl_basic_map_extend_dim(tab->bmap,
-		isl_basic_map_get_dim(tab->bmap), 1, 0, 2);
+	tab->bmap = isl_basic_map_extend_space(tab->bmap,
+		isl_basic_map_get_space(tab->bmap), 1, 0, 2);
 	k = isl_basic_map_alloc_div(tab->bmap);
 	if (k < 0)
 		return -1;
@@ -2199,7 +2199,13 @@ int isl_tab_add_div(struct isl_tab *tab, __isl_keep isl_vec *div,
 	return r;
 }
 
-struct isl_tab *isl_tab_from_basic_map(struct isl_basic_map *bmap)
+/* If "track" is set, then we want to keep track of all constraints in tab
+ * in its bmap field.  This field is initialized from a copy of "bmap",
+ * so we need to make sure that all constraints in "bmap" also appear
+ * in the constructed tab.
+ */
+__isl_give struct isl_tab *isl_tab_from_basic_map(
+	__isl_keep isl_basic_map *bmap, int track)
 {
 	int i;
 	struct isl_tab *tab;
@@ -2211,11 +2217,12 @@ struct isl_tab *isl_tab_from_basic_map(struct isl_basic_map *bmap)
 			    isl_basic_map_total_dim(bmap), 0);
 	if (!tab)
 		return NULL;
+	tab->preserve = track;
 	tab->rational = ISL_F_ISSET(bmap, ISL_BASIC_MAP_RATIONAL);
 	if (ISL_F_ISSET(bmap, ISL_BASIC_MAP_EMPTY)) {
 		if (isl_tab_mark_empty(tab) < 0)
 			goto error;
-		return tab;
+		goto done;
 	}
 	for (i = 0; i < bmap->n_eq; ++i) {
 		tab = add_eq(tab, bmap->eq[i]);
@@ -2226,17 +2233,21 @@ struct isl_tab *isl_tab_from_basic_map(struct isl_basic_map *bmap)
 		if (isl_tab_add_ineq(tab, bmap->ineq[i]) < 0)
 			goto error;
 		if (tab->empty)
-			return tab;
+			goto done;
 	}
+done:
+	if (track && isl_tab_track_bmap(tab, isl_basic_map_copy(bmap)) < 0)
+		goto error;
 	return tab;
 error:
 	isl_tab_free(tab);
 	return NULL;
 }
 
-struct isl_tab *isl_tab_from_basic_set(struct isl_basic_set *bset)
+__isl_give struct isl_tab *isl_tab_from_basic_set(
+	__isl_keep isl_basic_set *bset, int track)
 {
-	return isl_tab_from_basic_map((struct isl_basic_map *)bset);
+	return isl_tab_from_basic_map(bset, track);
 }
 
 /* Construct a tableau corresponding to the recession cone of "bset".
@@ -3231,12 +3242,21 @@ error:
 
 int isl_tab_track_bmap(struct isl_tab *tab, __isl_take isl_basic_map *bmap)
 {
+	bmap = isl_basic_map_cow(bmap);
 	if (!tab || !bmap)
 		goto error;
 
-	isl_assert(tab->mat->ctx, tab->n_eq == bmap->n_eq, return -1);
+	if (tab->empty) {
+		bmap = isl_basic_map_set_to_empty(bmap);
+		if (!bmap)
+			goto error;
+		tab->bmap = bmap;
+		return 0;
+	}
+
+	isl_assert(tab->mat->ctx, tab->n_eq == bmap->n_eq, goto error);
 	isl_assert(tab->mat->ctx,
-		    tab->n_con == bmap->n_eq + bmap->n_ineq, return -1);
+		    tab->n_con == bmap->n_eq + bmap->n_ineq, goto error);
 
 	tab->bmap = bmap;