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Slightly improve av_log2 in codeclib on ARMv6.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23866 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Andrew Mahone 2009-12-05 21:32:23 +00:00
parent 18c56ef386
commit 2aeb6c781d
1 changed files with 1 additions and 2 deletions
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3
apps/codecs/lib/codeclib.h
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@ -79,8 +79,7 @@ unsigned udiv32_arm(unsigned a, unsigned b);
#if (defined(CPU_ARM) && (ARM_ARCH > 4)) #if (defined(CPU_ARM) && (ARM_ARCH > 4))
static inline unsigned int av_log2(uint32_t v) static inline unsigned int av_log2(uint32_t v)
{ {
unsigned int lz = __builtin_clz(v); return v ? 31 - __builtin_clz(v) : v;
return 31 - lz + (lz >> 5); /* make sure av_log2(0) returns 0 */
} }
#else #else
/* From libavutil/common.h */ /* From libavutil/common.h */