Re: Why does C3 CPU downgrade in kernel 2.4.20?

From: Denis Vlasenko (
Date: Wed Dec 11 2002 - 08:19:23 EST

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.


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