diff options
| author | John Cox <jc@kynesim.co.uk> | 2016-01-20 17:56:30 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2016-01-22 02:38:41 +0100 |
| commit | 5115d8326e8eba707ee3048930674e2f9058d913 (patch) | |
| tree | 41723ca8e8667fd8975c48139e02b6823182cd1b | |
| parent | 48f80831bad87addf40b6496210817ea0efc85af (diff) | |
| download | ffmpeg-5115d8326e8eba707ee3048930674e2f9058d913.tar.gz | |
cabac_functions: Count zeros with ctz if it is fast
When refilling the low bit buffer after get_cabac count the bits with ctz
if the processor has a fast version.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/cabac_functions.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/libavcodec/cabac_functions.h b/libavcodec/cabac_functions.h index 31c919bd71..42841c7e08 100644 --- a/libavcodec/cabac_functions.h +++ b/libavcodec/cabac_functions.h @@ -76,9 +76,12 @@ static inline void renorm_cabac_decoder_once(CABACContext *c){ static void refill2(CABACContext *c){ int i; unsigned x; - +#if !HAVE_FAST_CLZ x= c->low ^ (c->low-1); i= 7 - ff_h264_norm_shift[x>>(CABAC_BITS-1)]; +#else + i = ff_ctz(c->low) - CABAC_BITS; +#endif x= -CABAC_MASK; |