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Optimize level_code computation, 6cpu cycles speedup.

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Originally committed as revision 21428 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2010-01-24 18:17:01 +00:00
parent f1d2b5728c
commit c78295ad1b
1 changed files with 1 additions and 1 deletions
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libavcodec/h264_cavlc.c
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@ -441,7 +441,7 @@ static int decode_residual(H264Context *h, GetBitContext *gb, DCTELEM *block, in
mask= -(level_code&1); mask= -(level_code&1);
level[trailing_ones]= (((2+level_code)>>1) ^ mask) - mask; level[trailing_ones]= (((2+level_code)>>1) ^ mask) - mask;
}else{ }else{
if(trailing_ones < 3) level_code += (level_code>>31)|1; level_code += ((level_code>>31)|1) & -(trailing_ones < 3);
suffix_length = 1; suffix_length = 1;
if(level_code + 3U > 6U) if(level_code + 3U > 6U)