X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=isl_map_simplify.c;h=db0d6f84c5b32e60ceb32632aa007a6b61cce1ac;hb=e15e7382929cb80379440c823f4d0d764fa659f8;hp=90575028f977b92084c25c94591b224647c62b65;hpb=6cb1cd6dc56327454d959349079cf98cdd39b7a7;p=platform%2Fupstream%2Fisl.git

diff --git a/isl_map_simplify.c b/isl_map_simplify.c
index 9057502..db0d6f8 100644
--- a/isl_map_simplify.c
+++ b/isl_map_simplify.c
@@ -1241,6 +1241,10 @@ struct isl_basic_map *isl_basic_map_simplify(struct isl_basic_map *bmap)
 		return NULL;
 	while (progress) {
 		progress = 0;
+		if (!bmap)
+			break;
+		if (isl_basic_map_plain_is_empty(bmap))
+			break;
 		bmap = isl_basic_map_normalize_constraints(bmap);
 		bmap = normalize_div_expressions(bmap);
 		bmap = remove_duplicate_divs(bmap, &progress);
@@ -1329,9 +1333,12 @@ static int div_is_redundant(struct isl_basic_map *bmap, int div)
 			return 0;
 	}
 
-	for (i = 0; i < bmap->n_div; ++i)
+	for (i = 0; i < bmap->n_div; ++i) {
+		if (isl_int_is_zero(bmap->div[i][0]))
+			continue;
 		if (!isl_int_is_zero(bmap->div[i][1+pos]))
 			return 0;
+	}
 
 	return 1;
 }
@@ -2110,6 +2117,8 @@ static struct isl_basic_map *normalize_divs_in_context(
 	for (i = 0; i < context->n_eq; ++i) {
 		int k;
 		k = isl_basic_map_alloc_equality(bmap);
+		if (k < 0)
+			return isl_basic_map_free(bmap);
 		isl_seq_cpy(bmap->eq[k], context->eq[i], 1 + total_context);
 		isl_seq_clr(bmap->eq[k] + 1 + total_context,
 				isl_basic_map_total_dim(bmap) - total_context);
@@ -2143,6 +2152,8 @@ struct isl_basic_map *isl_basic_map_gist(struct isl_basic_map *bmap,
 
 	bmap = isl_basic_map_remove_redundancies(bmap);
 	context = isl_basic_map_remove_redundancies(context);
+	if (!context)
+		goto error;
 
 	if (context->n_eq)
 		bmap = normalize_divs_in_context(bmap, context);