Date: Tue, 2 Nov 1999 18:09:59 +0000 From: Mark Ovens <mark@ukug.uk.freebsd.org> To: freebsd-questions@freebsd.org Subject: Re: Athlons.. Message-ID: <19991102180959.B317@marder-1> In-Reply-To: <199911020128.CAA26722@dorifer.heim3.tu-clausthal.de> References: <199911020128.CAA26722@dorifer.heim3.tu-clausthal.de>
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On Tue, Nov 02, 1999 at 02:28:40AM +0100, Oliver Fromme wrote:
> Stephen Roome wrote in list.freebsd-questions:
> > Does anyone know if the following example, taken from AMD's documentation,
> > would improve bcopy performance on the Athlon? (over the routine that would be
> > defaulted to ?)
>
> This _might_ improve performance when copying very large
> regions. However, the problem is, that movq (which is an
> MMX instruction) clobbers the FPU registers, which is a
> bad thing.
>
ISTR reading that this is an Intel-only problem and that AMD's
3D-Now! instructions don't clobber the FPU registers. Can't remember
the reason though, dedicated registers?
> Regards
> Oliver
>
> --
> Oliver Fromme, Leibnizstr. 18/61, 38678 Clausthal, Germany
> (Info: finger userinfo:olli@dorifer.heim3.tu-clausthal.de)
>
> "In jedem Stück Kohle wartet ein Diamant auf seine Geburt"
> (Terry Pratchett)
>
>
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