From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-patches-return-229322-listarch-gcc-patches=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 22767 invoked by alias); 22 Oct 2008 15:01:25 -0000
Received: (qmail 22758 invoked by uid 22791); 22 Oct 2008 15:01:24 -0000
X-Spam-Check-By: sourceware.org
Received: from mail.suse.de (HELO mx1.suse.de) (195.135.220.2)     by sourceware.org (qpsmtpd/0.31) with ESMTP; Wed, 22 Oct 2008 15:00:44 +0000
Received: from Relay1.suse.de (mail2.suse.de [195.135.221.8]) 	(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) 	(No client certificate requested) 	by mx1.suse.de (Postfix) with ESMTP id C64D242999; 	Wed, 22 Oct 2008 17:00:41 +0200 (CEST)
From: Andreas Schwab <schwab@suse.de>
To: Uros Bizjak <ubizjak@gmail.com>
Cc: Ralph Loader <suckfish@ihug.co.nz>, 	GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] Fix for PR 37809 and 37807
References: <48FF3CA0.6030405@gmail.com>
X-Yow: Was my SOY LOAF left out in th'RAIN?  It tastes REAL GOOD!!
Date: Wed, 22 Oct 2008 17:38:00 -0000
In-Reply-To: <48FF3CA0.6030405@gmail.com> (Uros Bizjak's message of "Wed, 22 	Oct 2008 16:45:52 +0200")
Message-ID: <jetzb4fze4.fsf@sykes.suse.de>
User-Agent: Gnus/5.110009 (No Gnus v0.9) Emacs/22.2 (gnu/linux)
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit
X-IsSubscribed: yes
Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-patches.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-patches/>
List-Post: <mailto:gcc-patches@gcc.gnu.org>
List-Help: <mailto:gcc-patches-help@gcc.gnu.org>
Sender: gcc-patches-owner@gcc.gnu.org
X-SW-Source: 2008-10/txt/msg00944.txt.bz2

Uros Bizjak <ubizjak@gmail.com> writes:

>> +
>> +
>> +void Sshift()
>> +{
>> +    volatile __m64 y = (__m64) 0xffffffffll;
>> +    __m64 x = y & (__m64) 0xffffffffll;
>> +    x = _m_psradi (x, 1);
>> +    x &= (__m64) 0x80000000ll;
>> +    if (0 == (long long) x)
>>   
>
> Aliasing violation on x variable.

How is that an aliasing violation?  There are no pointers involved.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."