Safely use nodes[0] in possible_polymorphic_call_targets

2016-03-16  Tom de Vries  <tom@codesourcery.com>

	PR lto/70187
	* ipa-devirt.c (possible_polymorphic_call_targets): Move
	nodes.length () == 1 test to before first nodes[0] access.

From-SVN: r234253

gcc/ChangeLog

 2016-03-16  Tom de Vries  <tom@codesourcery.com>
 
+	PR lto/70187
+	* ipa-devirt.c (possible_polymorphic_call_targets): Move
+	nodes.length () == 1 test to before first nodes[0] access.
+
+2016-03-16  Tom de Vries  <tom@codesourcery.com>
+
 	PR tree-optimization/68715
 	* graphite-scop-detection.c (scop_detection::merge_sese): Add missing
 	single_pred_p test.

gcc/ipa-devirt.c

@@ -3178,10 +3178,10 @@ possible_polymorphic_call_targets (tree otr_type,
 	  if (!outer_type->all_derivations_known)
 	    {
 	      if (!speculative && final_warning_records
+		  && nodes.length () == 1
 		  && TREE_CODE (TREE_TYPE (nodes[0]->decl)) == METHOD_TYPE)
 		{
 		  if (complete
-		      && nodes.length () == 1
 		      && warn_suggest_final_types
 		      && !outer_type->derived_types.length ())
 		    {
@@ -3197,7 +3197,6 @@ possible_polymorphic_call_targets (tree otr_type,
 		    }
 		  if (complete
 		      && warn_suggest_final_methods
-		      && nodes.length () == 1
 		      && types_same_for_odr (DECL_CONTEXT (nodes[0]->decl),
 					     outer_type->type))
 		    {