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Use clz instruction to calculate integer logarithms, speeds up decoding of one flac 8 sample by 12%.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23783 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Nils Wallménius 2009-11-29 15:21:00 +00:00
parent 07fe3562a1
commit 685ca2672e
2 changed files with 10 additions and 0 deletions
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2
apps/codecs/libffmpegFLAC/SOURCES
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@ -1,7 +1,9 @@
bitstream.c bitstream.c
decoder.c decoder.c
shndec.c shndec.c
#if !(defined(CPU_ARM) && (ARM_ARCH > 4))
tables.c tables.c
#endif
#if defined(CPU_COLDFIRE) #if defined(CPU_COLDFIRE)
coldfire.S coldfire.S
#elif defined(CPU_ARM) #elif defined(CPU_ARM)

8
apps/codecs/libffmpegFLAC/golomb.h
View file

@ -21,6 +21,13 @@
#include <limits.h> #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 */ /* From libavutil/common.h */
extern const uint8_t ff_log2_tab[256]; extern const uint8_t ff_log2_tab[256];
@ -41,6 +48,7 @@ static inline int av_log2(unsigned int v)
return n; return n;
} }
#endif
/** /**
* @file golomb.h * @file golomb.h