Messages in this thread | | | Date | Thu, 12 Dec 2002 19:09:57 +0100 | From | Pavel Machek <> | Subject | Re: Why does C3 CPU downgrade in kernel 2.4.20? |
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Hi!
> > > 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...
It still might be faster then a branch... or not if centaurs are really that simple. Pavel -- Worst form of spam? Adding advertisment signatures ala sourceforge.net. What goes next? Inserting advertisment *into* email? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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