re PR tree-optimization/25290 (PHI-OPT could be rewritten so that is uses fold)

2008-02-27  Richard Guenther  <rguenther@suse.de>

	PR middle-end/25290
	* fold-const.c (fold_unary): Return the correct argument,
	converted to the result type.

	* gcc.c-torture/execute/pr35390.c: New testcase.

From-SVN: r132710

gcc/ChangeLog

 2008-02-27  Richard Guenther  <rguenther@suse.de>
 
+	PR middle-end/25290
+	* fold-const.c (fold_unary): Return the correct argument,
+	converted to the result type.
+
+2008-02-27  Richard Guenther  <rguenther@suse.de>
+
 	PR middle-end/34971
 	* expr.c (expand_expr_real_1): Assert on rotates that operate
 	on partial modes.

gcc/fold-const.c

@@ -8340,7 +8340,7 @@ fold_unary (enum tree_code code, tree type, tree op0)
       if (TREE_CODE (arg0) == INTEGER_CST)
         return fold_not_const (arg0, type);
       else if (TREE_CODE (arg0) == BIT_NOT_EXPR)
-	return TREE_OPERAND (op0, 0);
+	return fold_convert (type, TREE_OPERAND (arg0, 0));
       /* Convert ~ (-A) to A - 1.  */
       else if (INTEGRAL_TYPE_P (type) && TREE_CODE (arg0) == NEGATE_EXPR)
 	return fold_build2 (MINUS_EXPR, type,

gcc/testsuite/ChangeLog

+2008-02-27  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/25290
+	* gcc.c-torture/execute/pr35390.c: New testcase.
+
 2008-02-27  Samuel Tardieu  <sam@rfc1149.net>
 
 	PR ada/22255

gcc/testsuite/gcc.c-torture/execute/pr35390.c

+extern void abort (void);
+
+unsigned int foo (int n)
+{
+  return ~((unsigned int)~n);
+}
+
+int main()
+{
+  if (foo(0) != 0)
+    abort ();
+  return 0;
+}