isl_basic_map_simplify: avoid infinite loop on empty input

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

diff --git a/isl_schedule.c b/isl_schedule.c
index ec314cf..51e9dc0 100644 (file)
--- a/isl_schedule.c
+++ b/isl_schedule.c
@@ -2190,6 +2190,8 @@ static int add_intra_constraints(struct isl_sched_graph *graph,
        struct isl_sched_node *node = edge->src;
 
        coef = intra_coefficients(graph, map);
+       if (!coef)
+               return -1;
 
        dim = isl_space_domain(isl_space_unwrap(isl_basic_set_get_space(coef)));
 
@@ -2238,6 +2240,8 @@ static int add_inter_constraints(struct isl_sched_graph *graph,
        struct isl_sched_node *dst = edge->dst;
 
        coef = inter_coefficients(graph, map);
+       if (!coef)
+               return -1;
 
        dim = isl_space_domain(isl_space_unwrap(isl_basic_set_get_space(coef)));