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Date: Fri, 31 Aug 2007 16:31:37 +0200
From: Kris Kennaway <kris@FreeBSD.org>
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To: obrien@freebsd.org, Stefan Lambrev <stefan.lambrev@moneybookers.com>, 
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Subject: Re: Adding k9 and k10 to bsd.cpu.mk
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David O'Brien wrote:
> On Thu, Aug 30, 2007 at 10:19:31AM +0300, Stefan Lambrev wrote:
>> k8-sse3, opteron-sse3, athlon64-sse3
> 
> Yeah, I guess I should add those... though bsd.cpu.mk was architected
> with some amount of guessing of what might in the future be useful.
> 
> Is there anything in /usr/src or /usr/ports that actually does anything
> with the information?
> 
>     .  elif ${CPUTYPE} == "prescott"
>     MACHINE_CPU = sse3 sse2 sse i686 mmx i586 i486 i386
> 
>     .  elif ${CPUTYPE} == "nocona"
>     MACHINE_CPU = sse3
> 
> for instance.
> 

MACHINE_CPU is supposed to be a complete list of relevant CPU features 
that ports can use to enable e.g. SSE2 asm optimizations if the CPUTYPE 
supports it.  A number of them exist that do this.

Kris