2007-09-22  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/33146
	* fold-const.c (fold_binary): Use the original tree
	for negating.
	* tree.h (STRIP_SIGN_NOPS): Converting from or to pointer
	also changes "sign".

	* gcc.c-torture/compile/pr33146.c: New testcase.

From-SVN: r128666