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From: Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
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To: Daniel Egger <degger@fhm.edu>, Dave Jones <davej@codemonkey.org.uk>
Subject: Re: Why does C3 CPU downgrade in kernel 2.4.20?
Date: Wed, 11 Dec 2002 11:19:23 -0200
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Cc: Joseph <jospehchan@yahoo.com.tw>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <009f01c2a000$f38885d0$3716a8c0@taipei.via.com.tw> <20021210055215.GA9124@suse.de> <1039504941.30881.10.camel@sonja>
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On 10 December 2002 05:22, Daniel Egger wrote:
> Am Die, 2002-12-10 um 06.52 schrieb Dave Jones:
> > I believe someone (Jeff Garzik?) benchmarked gcc code generation,
> > and the C3 executed code scheduled for a 486 faster than it did for
> > -m586
> > I'm not sure about the alignment flags. I've been meaning to look
> > into that myself...
>
> Interesting. I have no clue about which C3 you're talking about here
> but a VIA Ezra has all 686 instructions including cmov and thus
> optimising for PPro works best for me.
>
> Prolly I would have to do more benchmarking to find out about
> aligment advantages.

I heard cmovs are microcoded in Centaurs.

s...l...o...w...
--
vda
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