Re: Algorithm for CPU_X86

H. Peter Anvin (hpa@zytor.com)
3 Jun 2002 22:19:12 -0700

Followup to: <20020604031840.GA4289@werewolf.able.es>
By author: "J.A. Magallon" <jamagallon@able.es>
In newsgroup: linux.dev.kernel
>
> Following with the cpu selection changes, setting the flags controlled
> by the various CPU_X86_xxxx can be a real mess.
>
> But, I have ralized that those CPU_X86 flags can be logically split in
> two groups: features (TSC,MMX,3DNOW) and bugfixes (PPRO_FENCE) (or perhaps
> more, it is just a first thought...).
>

Don't forget optimizations. It's a big difference between "optimize
for" and "require" -- consider gcc, which have -mcpu= and -march=
respectively for the two.

-hpa

-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt	<amsp@zytor.com>
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