isl_coalesce.c: fix typo in comment

[platform/upstream/isl.git] / isl_map_simplify.c

diff --git a/isl_map_simplify.c b/isl_map_simplify.c
index a10da54..a25daf1 100644 (file)
--- a/isl_map_simplify.c
+++ b/isl_map_simplify.c
@@ -1271,6 +1271,10 @@ 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);
@@ -2212,6 +2216,8 @@ __isl_give isl_map *isl_map_gist_basic_map(__isl_take isl_map *map,
                goto error;;
        isl_assert(map->ctx, isl_space_is_equal(map->dim, context->dim), goto error);
        map = isl_map_compute_divs(map);
+       if (!map)
+               goto error;
        for (i = 0; i < map->n; ++i)
                context = isl_basic_map_align_divs(context, map->p[i]);
        for (i = map->n - 1; i >= 0; --i) {