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[RFC][PATCH][PR63586] Convert x+x+x+x into 4*x

From: kugan <kugan dot vivekanandarajah at linaro dot org>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: Richard Biener <richard dot guenther at gmail dot com>
Date: Fri, 26 Feb 2016 14:02:49 +1100
Subject: [RFC][PATCH][PR63586] Convert x+x+x+x into 4*x
Authentication-results: sourceware.org; auth=none

Hi,

This is an attempt to fix missed optimization: x+x+x+x -> 4*x asreported in PR63586.

Regression tested and bootstrapped on x86-64-linux-gnu with no newregressions.


Is this OK for next stage1?

Thanks,
Kugan


gcc/testsuite/ChangeLog:

2016-02-26  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/63586
	* gcc.dg/tree-ssa/reassoc-14.c: Fix multiply count.

gcc/ChangeLog:

2016-02-26  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/63586
	* tree-ssa-reassoc.c (transform_add_to_multiply): New.
	(reassociate_bb): Call transform_add_to_multiply.

Attachment: PR63586.txt
Description: Text document

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