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Date: Tue, 14 Nov 2000 20:25:33 +0100
To: Arjan van de Ven <adve@oce.nl>
Cc: linux-kernel@vger.kernel.org, petkan@spct.net
Subject: Re: Inconsistencies in 3dNOW handling
Message-ID: <20001114202532.A13576@bylbo.nowhere.earth>
In-Reply-To: <m13vZhZ-000OYhC@amadeus.home.nl> <20001114085729.A28456@pc1-adve.oce.nl>
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In-Reply-To: <20001114085729.A28456@pc1-adve.oce.nl>; from adve@oce.nl on Tue, Nov 14, 2000 at 08:57:29AM +0100
From: Yann Dirson <ydirson@altern.org>
Sender: linux-kernel-owner@vger.kernel.org
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On Tue, Nov 14, 2000 at 08:57:29AM +0100, Arjan van de Ven wrote:
> The test11pre2 code will also not run on a K6-II/III

I'll look at this.


> Some of the "MMX" instructions are part of "3Dnow" according  to AMD
> publications. This is especially true for the "prefetch" instructions which
> have a different memnonic/opcode on Intel CPU's.

If we don't use them on pure MMX-enabled machine, but only on 3Dnow
ones, what about renaming those *mmx* {files,funcs} to *3dnow* ?


> > > - BTW, what does this 512 stand for ?  Especially as it's used in
> > several places, a #define would seem nice at first glance.
> 
> The 512 is a rough estimate of the minimum size of the copy that makes it
> worth saving and restoring the extra processor-state for using mmx.

What about "#define MMX_MIN_ACCELERATED_COPYSIZE 512" in mmx.h ?

Er... s/MMX/3DNOW/ :)



Hm, noone commented my note about usercopy.c's 3dnow code being
possibly fixed by cut-and paste from elsewhere ?


Regards,
-- 
Yann Dirson    <ydirson@altern.org> |    Why make M$-Bill richer & richer ?
debian-email:   <dirson@debian.org> |   Support Debian GNU/Linux:
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