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Re: [PATCH, PR 32824] Add an additional LIM pass to assist dead code elimination

From: Sebastian Pop <sebpop at gmail dot com>
To: Richard Guenther <richard dot guenther at gmail dot com>
Cc: "Fang, Changpeng" <Changpeng dot Fang at amd dot com>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>, "rakdver at gcc dot gnu dot org" <rakdver at gcc dot gnu dot org>
Date: Wed, 17 Mar 2010 15:24:15 -0500
Subject: Re: [PATCH, PR 32824] Add an additional LIM pass to assist dead code elimination
References: <1C13CD442679CE45A2E80AE9251D7EF90D022A78@SAUSEXMBP01.amd.com> <84fc9c001003160324w317111dj9310be5c087820b5@mail.gmail.com> <1C13CD442679CE45A2E80AE9251D7EF90D022A7C@SAUSEXMBP01.amd.com> <84fc9c001003171039v7559e3d2o488479bde70091b1@mail.gmail.com>

On Wed, Mar 17, 2010 at 12:39, Richard Guenther
<richard.guenther@gmail.com> wrote:
> On Wed, Mar 17, 2010 at 6:03 PM, Fang, Changpeng <Changpeng.Fang@amd.com> wrote:
>> Hi,
>> ?I have updated the patch to move the existing LIM pass before copyprop/dce in the loop optimizer.
>> This patch helps eliminate dead code and make the reduction statement vectorizable when the reduction
>> variable is global. The patch fixes PR 32824.
>>
>> Note that the problem reported in PR32824 is very popular in fortran code. I am working on Levine benchmark
>> and found that there are at least 9 such cases.
>>
>> This patch passed bootstrapping and regression tests. I also tested on spec cpu2006 and found there is no
>> performance impact.
>>
>> Is it OK for the trunk?
>
> It is ok once stage1 opens.

I will add the testcase from the PR32824
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32824
with an appropriate pattern to test for vectorization.

Sebastian

References:
- [PATCH, PR 32824] Add an additional LIM pass to assist dead code elimination
  - From: Fang, Changpeng
- Re: [PATCH, PR 32824] Add an additional LIM pass to assist dead code elimination
  - From: Richard Guenther
- RE: [PATCH, PR 32824] Add an additional LIM pass to assist dead code elimination
  - From: Fang, Changpeng
- Re: [PATCH, PR 32824] Add an additional LIM pass to assist dead code elimination
  - From: Richard Guenther

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