[Ffmpeg-cvslog] CVS: ffmpeg/libavcodec/i386 dsputil_mmx.c, 1.95, 1.96 idct_mmx.c, 1.4, 1.5

[Loren Merritt]

On Wed, 1 Jun 2005, [iso-8859-1] M?ns Rullg?rd wrote:

> lorenm at mplayerhq.hu (Loren Merritt CVS) writes:
>
>> Update of /cvsroot/ffmpeg/ffmpeg/libavcodec/i386
>> In directory mail:/var2/tmp/cvs-serv9738/i386
>>
>> Modified Files:
>> 	dsputil_mmx.c idct_mmx.c
>> Log Message:
>> MMX for H.264 iDCT (adapted from x264)
>
> What sort of speedup are we talking about here?

on an Opteron:
2269 dezicycles in ff_h264_idct_add_c, 16777142 runs, 74 skips
  517 dezicycles in ff_h264_idct_add_mmx2, 16777151 runs, 65 skips
total decode speed: +6%

--Loren Merritt