Do we need this junk?

Nikolas Britton nikolas.britton at
Fri Apr 6 20:48:00 UTC 2007

On 4/6/07, Ed Schouten <ed at> wrote:
> * Nikolas Britton <nikolas.britton at> 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/ 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.

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