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[OpenDivX] New optimized basic_prediction_mmx.c with precision

Hi all

I reimplemented basic_prediction_mmx.c (attached) once again using mmx.
This time with the same precision as the c-routines. It requires a few
more instructions in most of the inner loops but doesnt sacrifice video
quality for speed as my old mmx implementation did.
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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