* 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, 9 insertions, 2 deletions

diff --git a/gcc/tree-parloops.c b/gcc/tree-parloops.c
index 339ddcc18a5..c5b76559ba0 100644
--- a/gcc/tree-parloops.c
+++ b/gcc/tree-parloops.c
@@ -387,8 +387,14 @@ loop_parallel_p (struct loop *loop, struct obstack * parloop_obstack)
   datarefs = VEC_alloc (data_reference_p, heap, 10);
   dependence_relations = VEC_alloc (ddr_p, heap, 10 * 10);
   loop_nest = VEC_alloc (loop_p, heap, 3);
-  compute_data_dependences_for_loop (loop, true, &loop_nest, &datarefs,
-				     &dependence_relations);
+  if (! compute_data_dependences_for_loop (loop, true, &loop_nest, &datarefs,
+					   &dependence_relations))
+    {
+      if (dump_file && (dump_flags & TDF_DETAILS))
+	fprintf (dump_file, "  FAILED: cannot analyze data dependencies\n");
+      ret = false;
+      goto end;
+    }
   if (dump_file && (dump_flags & TDF_DETAILS))
     dump_data_dependence_relations (dump_file, dependence_relations);
 
@@ -405,6 +411,7 @@ loop_parallel_p (struct loop *loop, struct obstack * parloop_obstack)
     fprintf (dump_file,
 	     "  FAILED: data dependencies exist across iterations\n");
 
+ end:
   VEC_free (loop_p, heap, loop_nest);
   free_dependence_relations (dependence_relations);
   free_data_refs (datarefs);