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Date: Fri, 28 Sep 2012 15:39:00 -0000
Message-ID: <CAFULd4aXY1HDrp0+1Oh__wHH=dMPbiA6ah+TqjnnGRDCRUgKUw@mail.gmail.com>
Subject: Re: [PATCH v2, rtl-optimization]: Fix PR54457, [x32] Fail to combine 64bit index + constant
From: Uros Bizjak <ubizjak@gmail.com>
To: Jakub Jelinek <jakub@redhat.com>
Cc: gcc-patches@gcc.gnu.org, Richard Sandiford <rdsandiford@googlemail.com>, 	Eric Botcazou <ebotcazou@adacore.com>
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On Thu, Sep 27, 2012 at 8:20 PM, Jakub Jelinek <jakub@redhat.com> wrote:
> On Thu, Sep 27, 2012 at 08:04:58PM +0200, Uros Bizjak wrote:
>> After some off-line discussion with Richard, attached is v2 of the patch.
>>
>> 2012-09-27  Uros Bizjak  <ubizjak@gmail.com>
>>
>>         PR rtl-optimization/54457
>>         * simplify-rtx.c (simplify_subreg):
>>       Simplify (subreg:SI (op:DI ((x:DI) (y:DI)), 0)
>>       to (op:SI (subreg:SI (x:DI) 0) (subreg:SI (x:DI) 0)).
>
> Is that a good idea even for WORD_REGISTER_OPERATIONS targets?

I have bootstrapped and regtested [1] the patch on
alphaev68-pc-linux-gnu, a WORD_REGISTER_OPERATIONS target, and there
were no additional failures.

[1] http://gcc.gnu.org/ml/gcc-testresults/2012-09/msg02828.html

Uros.