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Date: Fri, 6 Apr 2007 15:47:59 -0500
From: "Nikolas Britton" <nikolas.britton@gmail.com>
To: "Ed Schouten" <ed@fxq.nl>
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Cc: FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: Do we need this junk?
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On 4/6/07, Ed Schouten <ed@fxq.nl> wrote:
> * Nikolas Britton <nikolas.britton@gmail.com> wrote:
> > The legacy bits don't upset me, what upsets me is sacrificing
> > performance so we can  support a minority of legacy systems. IIRC? we
> > could recode the Kernel for SSE2 math if the processor was guaranteed
> > to have that SSE2. SSE2 adds 214 new instructions to the existing x86
> > instruction set.
>
> But SSE2 isn't even used in kernel space, not even on AMD64. As far as I
> can see, the only exception I can see is pagezero. Just take a look at
> src/sys/conf/kern.mk. If it's not even possible to use SSE2 in
> kernelspace on amd64, why would it be possible to do so on i386?
>

Doesn't Apple use SSE2/3 in the kernel? IIRC Mac OS X (Darwin) running
on a white box PC won't even boot if it's missing.