* tree-vrp.c (operand_less_p): Ignore fold overflow warnings.

From-SVN: r123170

gcc/ChangeLog

+2007-03-23  Ian Lance Taylor  <iant@google.com>
+
+	* tree-vrp.c (operand_less_p): Ignore fold overflow warnings.
+
 2007-03-23  Steven Bosscher  <steven@gcc.gnu.org>
 
 	* tracer.c (tracer): Don't take FLAGS argument.  Assert we are

gcc/tree-vrp.c

@@ -647,7 +647,12 @@ operand_less_p (tree val, tree val2)
     {
       tree tcmp;
 
+      fold_defer_overflow_warnings ();
+
       tcmp = fold_binary_to_constant (LT_EXPR, boolean_type_node, val, val2);
+
+      fold_undefer_and_ignore_overflow_warnings ();
+
       if (!tcmp)
 	return -2;