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[OpenDivX] New optimized basic_prediction_mmx.c

Hi all.

I reimplemented basic_prediction_mmx.c (attached) to actually use mmx
instructions. I have no exact numbers but by measuring the achieved
framerate the speed improvement is about 30% for the whole decoder. This
means the speed improvement for just these routines is much much higher.
Would be great if someone with write access could add it to the cvs so
everyone can take advantage of it.

Mattias Blomqvist


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