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Date: Tue, 22 Feb 2005 11:03:00 -0800
From: Nate Lawson <nate@root.org>
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To: David Schultz <das@FreeBSD.ORG>
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	<421B24E2.7050800@portaone.com> <20050222135251.GB29054@VARK.MIT.EDU>
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Subject: Re: cvs commit: src/lib/msun/i387 Makefile.inc e_atan2.S e_atan2f.S
 s_atan.S
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David Schultz wrote:
> By the way, here are some other results for the Pentium 4, all
> without SSE.  SSE makes things a bit worse, probably because the
> x87 and SSE registers are shared, and the Pentium 4 imposes a
> large penalty for switching between the two sets.

I don't believe this is correct.  MMX and x87 use the same register 
context (hence emms), however the XMM registers (SSE*) are separate. 
It's possible gcc is generating MMX instructions though with your SSE 
command line switch.

-- 
Nate