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Optimize (amvd>2)+(amvd>32), about 1 cpu cycles faster.

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patch by Zhou Zongyi @ zhouzy () os punkt pku dot edu speck cn

Originally committed as revision 22084 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Zhou Zongyi 2010-02-26 22:45:35 +00:00 committed by Michael Niedermayer
parent 4e06acbde4
commit 821fe7f3e6
1 changed files with 2 additions and 1 deletions
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3
libavcodec/h264_cabac.c
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@ -912,7 +912,8 @@ static int decode_cabac_mb_ref( H264Context *h, int list, int n ) {
static int decode_cabac_mb_mvd( H264Context *h, int ctxbase, int amvd, int *mvda) {
int mvd;
if(!get_cabac(&h->cabac, &h->cabac_state[ctxbase+(amvd>2)+(amvd>32)])){
if(!get_cabac(&h->cabac, &h->cabac_state[ctxbase+((amvd-3)>>(INT_BIT-1))+((amvd-33)>>(INT_BIT-1))+2])){
// if(!get_cabac(&h->cabac, &h->cabac_state[ctxbase+(amvd>2)+(amvd>32)])){
*mvda= 0;
return 0;
}