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[PATCH, i386]: Fix PR44578, GCC generates MMX instructions but fails to generate "emms"

From: Uros Bizjak <ubizjak at gmail dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: Teresa Johnson <tejohnson at google dot com>
Date: Mon, 29 Apr 2013 22:14:13 +0200
Subject: [PATCH, i386]: Fix PR44578, GCC generates MMX instructions but fails to generate "emms"

Hello!

Attached patch fixes PR44578, where MMX register was allocated for
zero_extendsidi2 RTX. The patch adds "!" to the interfering
alternative, so RA won't choose alternative involving MMX register
unless absolute necessary.

2013-04-29  Uros Bizjak  <ubizjak@gmail.com>

    PR target/44578
    * config/i386/i386.md (*zero_extendisid2): Add "!" to m->?*y
    alternative.

testsuite/ChangeLog:

2013-04-29  Uros Bizjak  <ubizjak@gmail.com>

    PR target/44578
    * gcc.target/i386/pr44578.c: New test.

Patch was bootstrapped and regression tested on x86_64-pc-linux-gnu
{,-m32} and was committed to mainline SVN.

The patch will be backported to 4.7 and 4.8 branches.

Uros.

Attachment: r.diff.txt
Description: Text document

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