2014-12-01  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/15346
	* Makefile.in (gimple-match.o-warn): Remove -Wno-unused-parameter,
	add -Wno-unused-but-set-variable.
	* match.pd: Combine two successive divisions.

	* gcc.dg/tree-ssa/forwprop-32.c: New testcase.

From-SVN: r218211