* tree-predcom.c (tree_predictive_commoning_loop): Bail out when

        compute_data_dependences_for_loop returns false.
        * tree-parloops.c (loop_parallel_p): Likewise.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@183518 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 11 insertions, 2 deletions

diff --git a/gcc/tree-predcom.c b/gcc/tree-predcom.c
index 751bdebfa8a..64198788967 100644
--- a/gcc/tree-predcom.c
+++ b/gcc/tree-predcom.c
@@ -2476,8 +2476,17 @@ tree_predictive_commoning_loop (struct loop *loop)
   datarefs = VEC_alloc (data_reference_p, heap, 10);
   dependences = VEC_alloc (ddr_p, heap, 10);
   loop_nest = VEC_alloc (loop_p, heap, 3);
-  compute_data_dependences_for_loop (loop, true, &loop_nest, &datarefs,
-				     &dependences);
+  if (! compute_data_dependences_for_loop (loop, true, &loop_nest, &datarefs,
+					   &dependences))
+    {
+      if (dump_file && (dump_flags & TDF_DETAILS))
+	fprintf (dump_file, "Cannot analyze data dependencies\n");
+      VEC_free (loop_p, heap, loop_nest);
+      free_data_refs (datarefs);
+      free_dependence_relations (dependences);
+      return false;
+    }
+
   if (dump_file && (dump_flags & TDF_DETAILS))
     dump_data_dependence_relations (dump_file, dependences);