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Replace mvd>2 + mvd>32 by MIN((mvd+28)*17>>9, 2)

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same speed as far as i can meassure but it might have fewer branches on some
archs.
Idea from x264 / jason

Originally committed as revision 22027 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2010-02-24 16:16:08 +00:00
parent bc77fce6ba
commit 6d0155c79c
1 changed files with 1 additions and 1 deletions
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2
libavcodec/h264_cabac.c
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@ -915,7 +915,7 @@ static int decode_cabac_mb_mvd( H264Context *h, int list, int n, int l ) {
int ctxbase = (l == 0) ? 40 : 47;
int mvd;
if(!get_cabac(&h->cabac, &h->cabac_state[ctxbase+(amvd>2) + (amvd>32)]))
if(!get_cabac(&h->cabac, &h->cabac_state[ctxbase+FFMIN(((amvd+28)*17)>>9,2)]))
return 0;
mvd= 1;