Handle unused reduction in create_loads_for_reductions

2015-07-16  Tom de Vries  <tom@codesourcery.com>

	* tree-parloops.c (create_loads_for_reductions): Handle case that
	reduction is unused.

From-SVN: r225872

gcc/ChangeLog

+2015-07-16  Tom de Vries  <tom@codesourcery.com>
+
+	* tree-parloops.c (create_loads_for_reductions): Handle case that
+	reduction is unused.
+
 2015-07-16  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/66894

gcc/tree-parloops.c

@@ -1145,6 +1145,10 @@ create_loads_for_reductions (reduction_info **slot, struct clsn_data *clsn_data)
   tree name;
   tree x;
 
+  /* If there's no exit phi, the result of the reduction is unused.  */
+  if (red->keep_res == NULL)
+    return 1;
+
   gsi = gsi_after_labels (clsn_data->load_bb);
   load_struct = build_simple_mem_ref (clsn_data->load);
   load_struct = build3 (COMPONENT_REF, type, load_struct, red->field,