r235566 - in /trunk/gcc: ChangeLog match.pd

[rguenth@gcc.gnu.org]

Author: rguenth
Date: Thu Apr 28 12:34:28 2016
New Revision: 235566

URL: https://gcc.gnu.org/viewcvs?rev=235566&root=gcc&view=rev
Log:
2016-04-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/70840
	* match.pd: powi(-x, y) and powi(|x|,y) -> powi(x,y) if y is even;
	Fix pow(copysign(x, y), z) -> pow(x, z) and add powi variant;
	Mark x * pow(x,c) -> pow(x,c+1) commutative.
	Add powi(x,y) * powi(z,y) -> powi(x*z,y).

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/match.pd