re PR bootstrap/49086 (libgomp/task.c:79:1: internal compiler error: Segmentation fault)

	PR bootstrap/49086
	* gimple-fold.c (and_comparisons_1, or_comparisons_1): Return NULL
	for PHI args that are SSA_NAME_IS_DEFAULT_DEF.

From-SVN: r173967

gcc/ChangeLog

+2011-05-20  Jakub Jelinek  <jakub@redhat.com>
+
+	PR bootstrap/49086
+	* gimple-fold.c (and_comparisons_1, or_comparisons_1): Return NULL
+	for PHI args that are SSA_NAME_IS_DEFAULT_DEF.
+
 2011-05-20  Joseph Myers  <joseph@codesourcery.com>
 
 	* Makefile.in: Update comment referring to $(OBJS-common).

gcc/gimple-fold.c

@@ -2276,7 +2276,8 @@ and_comparisons_1 (enum tree_code code1, tree op1a, tree op1b,
 							code2, op2a, op2b))
 			return NULL_TREE;
 		    }
-		  else if (TREE_CODE (arg) == SSA_NAME)
+		  else if (TREE_CODE (arg) == SSA_NAME
+			   && !SSA_NAME_IS_DEFAULT_DEF (arg))
 		    {
 		      tree temp;
 		      gimple def_stmt = SSA_NAME_DEF_STMT (arg);
@@ -2737,7 +2738,8 @@ or_comparisons_1 (enum tree_code code1, tree op1a, tree op1b,
 							code2, op2a, op2b))
 			return NULL_TREE;
 		    }
-		  else if (TREE_CODE (arg) == SSA_NAME)
+		  else if (TREE_CODE (arg) == SSA_NAME
+			   && !SSA_NAME_IS_DEFAULT_DEF (arg))
 		    {
 		      tree temp;
 		      gimple def_stmt = SSA_NAME_DEF_STMT (arg);