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initial commit log message.


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(was duplicated in libavcodec/ppc/vc1dsp_altivec.c
nd libavcodec/ppc/mpegvideo_altivec.c, and will be
used in upcoming routines for h264_altivec.c)


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moving another bit&1 out, this is as fast as with it in there, but it makes more sense with it outside of the loop


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move the &1 out of the asm so gcc can optimize it away in inlined cases (yes this is slightly faster)


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this is faster on P3, should be faster on AMD, and should be slower on P4
its disabled by default (benchmarks welcome so we know when to enable it)


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reading 8bit mem into a 8bit register needs 2 uops on P4, 8bit->32bit with zero extension needs just 1


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slightly faster on P3


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