cvs commit: src/lib/msun/i387 Makefile.inc e_atan2.S e_atan2f.S
nate at root.org
Tue Feb 22 19:03:07 GMT 2005
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.
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