2015-07-06  Richard Biener  <rguenther@suse.de>

	PR middle-end/66759
	* match.pd: Add missing constraint of y to REAL_CST in
	REAL_CST - x CMP y to y - CST CMP x simplification.

	* gcc.dg/torture/pr66759.c: New testcase.

From-SVN: r225449