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To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: Algorithm for CPU_X86
Date: 3 Jun 2002 22:19:12 -0700
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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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