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

tree-predcom.c (tree_predictive_commoning_loop): Bail out when compute_data_dependences_for_loop returns false.

        * tree-predcom.c (tree_predictive_commoning_loop): Bail out when
        compute_data_dependences_for_loop returns false.
        * tree-parloops.c (loop_parallel_p): Likewise.

From-SVN: r183518

gcc/ChangeLog

+2012-01-25  Andrey Belevantsev  <abel@ispras.ru>
+
+	* tree-predcom.c (tree_predictive_commoning_loop): Bail out when
+	compute_data_dependences_for_loop returns false.
+	* tree-parloops.c (loop_parallel_p): Likewise.
+
 2012-01-25  Richard Guenther  <rguenther@suse.de>
 
 	* tree.h (get_pointer_alignment_1): Declare.

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);

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);