isl_map_fix_si: drop basic maps that have become empty

Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>

diff --git a/isl_map.c b/isl_map.c
index 4cbecc3..6339d46 100644 (file)
--- a/isl_map.c
+++ b/isl_map.c
@@ -4957,9 +4957,9 @@ struct isl_map *isl_map_fix_si(struct isl_map *map,
                return NULL;
 
        isl_assert(map->ctx, pos < isl_map_dim(map, type), goto error);
-       for (i = 0; i < map->n; ++i) {
+       for (i = map->n - 1; i >= 0; --i) {
                map->p[i] = isl_basic_map_fix_si(map->p[i], type, pos, value);
-               if (!map->p[i])
+               if (remove_if_empty(map, i) < 0)
                        goto error;
        }
        ISL_F_CLR(map, ISL_MAP_NORMALIZED);