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On Wed, Feb 16, 2011 at 06:43, KHMan <> wrote:
>>> Sorry to barge in, it is a worrying difference. One thing is bugging me:
>>> Is the C code running SSE2? IIRC gcc -O2 does not normally enable SSE2.
> Checked the gcc 4.5.2 docs, AFAICT there is still a generic behaviour and
> it's not "-march=native". Still need to explicitly enable SSE2 if the
> compiler was not built with --with-fpmath=sse or something like that.

Or simply pass gcc option "-msse2".