2012-05-30  Richard Guenther  <rguenther@suse.de>

	PR middle-end/53501
	* fold-const.c (fold_binary_loc): Make sure to call
	fold_plusminus_mult_expr with the original sign of operands.

	* gcc.dg/torture/pr53501.c: New testcase.
	* c-c++-common/restrict-2.c: Adjust.

From-SVN: r188009