2007-11-16  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/34099
	* tree-ssa-ccp.c (likely_value): Use a whitelist for operators
	that produce UNDEFINED result if at least one of its operands
	is UNDEFINED.  By default the result is only UNDEFINED if all
	operands are UNDEFINED.

	* g++.dg/torture/pr3499.C: New testcase.
	* gcc.c-torture/execute/pr34099.c: Likewise.

From-SVN: r130222