re PR tree-optimization/15777 (Fold does not always fold sub trees)

2004-07-07  Andrew Pinski  <apinski@apple.com>

        PR tree-optimization/15777
        * fold-const.c (fold_single_bit_test): Fold the x^1 expression.

From-SVN: r84231

gcc/ChangeLog

 2004-07-07  Andrew Pinski  <apinski@apple.com>
 
+	PR tree-optimization/15777
+	* fold-const.c (fold_single_bit_test): Fold the x^1 expression.
+
 	* expr.c (expand_expr_real_1): Fix formating.
 	BUFFER_REF and IN_EXPR are dead.
 	* fold-const.c (non_lvalue): BUFFER_REF is dead.

gcc/fold-const.c

@@ -5849,8 +5849,8 @@ fold_single_bit_test (enum tree_code code, tree arg0, tree arg1,
 			inner, size_int (bitnum));
 
       if (code == EQ_EXPR)
-	inner = build2 (BIT_XOR_EXPR, intermediate_type,
-			inner, integer_one_node);
+	inner = fold (build2 (BIT_XOR_EXPR, intermediate_type,
+			      inner, integer_one_node));
 
       /* Put the AND last so it can combine with more things.  */
       inner = build2 (BIT_AND_EXPR, intermediate_type,