From: Maciej Hrebien <m_hrebien@wp.pl>
To: linux-assembly@vger.kernel.org
Subject: Re: paddw vs paddb
Date: Wed, 29 Dec 2004 23:40:25 +0100 [thread overview]
Message-ID: <41D33259.79A348C4@wp.pl> (raw)
In-Reply-To: 20041229121244.27226.qmail@web52908.mail.yahoo.com
Ankit Jain wrote:
>
> hi
>
> i know about movd but i want to move 16bit atr a time
You can't move a word to a mmx register directly. You have to
simulate it ie. with a temp ored with the destination register:
pxor %mm7,%mm7
xor %eax,%eax
movw your_word,%ax
movd %eax,%mm7
por %mm7,%mm0
which moves your_word to the lowest part of mm0 and you have
to be sure that low word of mm0 is zeroed before the operation.
Or you can:
movd %mm0,%eax
movw your_word,%ax
movd %eax,%mm0
etc. but i don't recomend this kind of coding. Keep your words
together and use movq.
--
Maciej Hrebien
prev parent reply other threads:[~2004-12-29 22:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-23 10:59 paddw vs paddb Ankit Jain
2004-12-24 9:01 ` Maciej Hrebien
2004-12-25 7:21 ` Ankit Jain
2004-12-25 10:40 ` Maciej Hrebien
2004-12-29 12:12 ` Ankit Jain
2004-12-29 22:40 ` Maciej Hrebien [this message]
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