ipa-cp.c (ipa_get_indirect_edge_target_1): Use can_refer; do not speculate to impossible targets.

	* ipa-cp.c (ipa_get_indirect_edge_target_1): Use can_refer; do not
	speculate to impossible targets.
	* ipa-prop.c (try_make_edge_direct_virtual_call): Likewise.

From-SVN: r231705

gcc/ChangeLog

+2015-12-10  Jan Hubicka  <hubicka@ucw.cz>
+
+	* ipa-cp.c (ipa_get_indirect_edge_target_1): Use can_refer; do not
+	speculate to impossible targets.
+	* ipa-prop.c (try_make_edge_direct_virtual_call): Likewise.
+
 2015-12-16  Aditya Kumar  <aditya.k7@samsung.com>
 	    Sebastian Pop  <s.pop@samsung.com>
 

gcc/ipa-cp.c

@@ -2077,15 +2077,22 @@ ipa_get_indirect_edge_target_1 (struct cgraph_edge *ie,
       unsigned HOST_WIDE_INT offset;
       if (vtable_pointer_value_to_vtable (t, &vtable, &offset))
 	{
+	  bool can_refer;
 	  target = gimple_get_virt_method_for_vtable (ie->indirect_info->otr_token,
-						      vtable, offset);
-	  if (target)
+						      vtable, offset, &can_refer);
+	  if (can_refer)
 	    {
-	      if ((TREE_CODE (TREE_TYPE (target)) == FUNCTION_TYPE
-		   && DECL_FUNCTION_CODE (target) == BUILT_IN_UNREACHABLE)
+	      if (!target
+		  || (TREE_CODE (TREE_TYPE (target)) == FUNCTION_TYPE
+		      && DECL_FUNCTION_CODE (target) == BUILT_IN_UNREACHABLE)
 		  || !possible_polymorphic_call_target_p
 		       (ie, cgraph_node::get (target)))
-		target = ipa_impossible_devirt_target (ie, target);
+		{
+		  /* Do not speculate builtin_unreachable, it is stupid!  */
+		  if (ie->indirect_info->vptr_changed)
+		    return NULL;
+		  target = ipa_impossible_devirt_target (ie, target);
+		}
               *speculative = ie->indirect_info->vptr_changed;
 	      if (!*speculative)
 	        return target;
@@ -2163,7 +2170,11 @@ ipa_get_indirect_edge_target_1 (struct cgraph_edge *ie,
 
   if (target && !possible_polymorphic_call_target_p (ie,
 						     cgraph_node::get (target)))
-    target = ipa_impossible_devirt_target (ie, target);
+    {
+      if (*speculative)
+	return NULL;
+      target = ipa_impossible_devirt_target (ie, target);
+    }
 
   return target;
 }

gcc/ipa-prop.c

@@ -2898,18 +2898,22 @@ try_make_edge_direct_virtual_call (struct cgraph_edge *ie,
 					   true);
       if (t && vtable_pointer_value_to_vtable (t, &vtable, &offset))
 	{
+	  bool can_refer;
 	  t = gimple_get_virt_method_for_vtable (ie->indirect_info->otr_token,
-						      vtable, offset);
-	  if (t)
+						 vtable, offset, &can_refer);
+	  if (can_refer)
 	    {
-	      if ((TREE_CODE (TREE_TYPE (t)) == FUNCTION_TYPE
-		   && DECL_FUNCTION_CODE (t) == BUILT_IN_UNREACHABLE)
+	      if (!t
+		  || (TREE_CODE (TREE_TYPE (t)) == FUNCTION_TYPE
+		      && DECL_FUNCTION_CODE (t) == BUILT_IN_UNREACHABLE)
 		  || !possible_polymorphic_call_target_p
 		       (ie, cgraph_node::get (t)))
 		{
 		  /* Do not speculate builtin_unreachable, it is stupid!  */
 		  if (!ie->indirect_info->vptr_changed)
 		    target = ipa_impossible_devirt_target (ie, target);
+		  else
+		    target = NULL;
 		}
 	      else
 		{