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Optimize level_code computation, 6cpu cycles speedup.
author
Michael Niedermayer
<michaelni@gmx.at>
Sun, 24 Jan 2010 18:17:01 +0000
(18:17 +0000)
committer
Michael Niedermayer
<michaelni@gmx.at>
Sun, 24 Jan 2010 18:17:01 +0000
(18:17 +0000)
Originally committed as revision 21428 to svn://svn.ffmpeg.org/ffmpeg/trunk
libavcodec/h264_cavlc.c
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diff --git
a/libavcodec/h264_cavlc.c
b/libavcodec/h264_cavlc.c
index
c248137
..
9440ce0
100644
(file)
--- a/
libavcodec/h264_cavlc.c
+++ b/
libavcodec/h264_cavlc.c
@@
-441,7
+441,7
@@
static int decode_residual(H264Context *h, GetBitContext *gb, DCTELEM *block, in
mask= -(level_code&1);
level[trailing_ones]= (((2+level_code)>>1) ^ mask) - mask;
}else{
-
if(trailing_ones < 3) level_code += (level_code>>31)|1
;
+
level_code += ((level_code>>31)|1) & -(trailing_ones < 3)
;
suffix_length = 1;
if(level_code + 3U > 6U)