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To: James Morris <jmorris@redhat.com>
cc: linux-kernel@vger.kernel.org, torvalds@osdl.org
Subject: Re: [PATCH] Re-implemented i586 asm AES (updated)
References: <2qbyt-1Op-45@gated-at.bofh.it> <2qemF-3Pj-49@gated-at.bofh.it>
From: Andi Kleen <ak@muc.de>
Date: Fri, 06 Aug 2004 17:09:17 +0200
In-Reply-To: <2qemF-3Pj-49@gated-at.bofh.it> (James Morris's message of
 "Fri, 06 Aug 2004 17:00:21 +0200")
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James Morris <jmorris@redhat.com> writes:
>
>> Does it work on x86 CPUs without MMX?
>
> Yes, Linus removed the MMX stuff.

You could use .altinstructions to patch a jump in at runtime
based on CPU capabilities. Assuming MMX is really faster of course.

See arch/x86_64/lib/copy_page.S for an example.

-Andi