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Re: [RTL, Patch] Int div by constant compilation enhancement

From: Jeff Law <law at redhat dot com>
To: Alex Velenko <Alex dot Velenko at arm dot com>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: Marcus Shawcroft <Marcus dot Shawcroft at arm dot com>, Tejas Belagod <Tejas dot Belagod at arm dot com>
Date: Tue, 04 Nov 2014 15:34:06 -0700
Subject: Re: [RTL, Patch] Int div by constant compilation enhancement
Authentication-results: sourceware.org; auth=none
References: <5457B4FA dot 5070204 at arm dot com>

On 11/03/14 10:01, Alex Velenko wrote:

Hi,
This patch adds a mid-end check to catch division by
constant case and optimize it to generate one shift,
instead of two.

A testacase to check the correct codegeneration for aarch64
is added. This check is not made generic, because the optimisation
implemented is not used by all targets.

Is it ok?

Thanks,
Alex

gcc/

2014-11-03  Alex Velenko  <Alex.Velenko@arm.com>

     * simplify-rtx.c (simplify_binary_operation_1): Div check added.
     * rtl.h (SUBREG_P): New macro added.

gcc/testsuite/

2014-11-03  Alex Velenko  <Alex.Velenko@arm.com>

     * gcc.dg/asr-div1.c : New testcase.

OK for the trunk.

THanks,
Jeff

References:
- [RTL, Patch] Int div by constant compilation enhancement
  - From: Alex Velenko

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