diff options
| author | Nils Wallménius <nils@rockbox.org> | 2009-11-29 15:21:00 +0000 |
|---|---|---|
| committer | Nils Wallménius <nils@rockbox.org> | 2009-11-29 15:21:00 +0000 |
| commit | 685ca2672e5842fe185c8f12da6bf108fd8f074f (patch) | |
| tree | 6502f259585220713af4976652454cf6ec1ccac4 /apps/codecs/libffmpegFLAC/golomb.h | |
| parent | 07fe3562a1195784c4a761b63b4d027cd0984c0b (diff) | |
Use clz instruction to calculate integer logarithms, speeds up decoding of one flac 8 sample by 12%.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23783 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/codecs/libffmpegFLAC/golomb.h')
| -rw-r--r-- | apps/codecs/libffmpegFLAC/golomb.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/apps/codecs/libffmpegFLAC/golomb.h b/apps/codecs/libffmpegFLAC/golomb.h index 659ecc1579..11753fc4bb 100644 --- a/apps/codecs/libffmpegFLAC/golomb.h +++ b/apps/codecs/libffmpegFLAC/golomb.h @@ -21,6 +21,13 @@ #include <limits.h> +#if (defined(CPU_ARM) && (ARM_ARCH > 4)) +static inline int av_log2(uint32_t v) +{ + return 31 - __builtin_clz(v); +} +#else + /* From libavutil/common.h */ extern const uint8_t ff_log2_tab[256]; @@ -41,6 +48,7 @@ static inline int av_log2(unsigned int v) return n; } +#endif /** * @file golomb.h |