Some mmx/sse2 benchmarking

[Cyrille Berger]

Hi there,

I have made some benchmarking about mmx and sse2. It's valgrind result,
so it's cache miss. I don't have sysprof on that computer to do real
measurement of cpu time. I have attach the source code so that you can
check that I didn't made a mistake :)

-- 
Cyrille Berger
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