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lavu/intmath: add faster clz support

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This should be useful for the sofalizer filter.

Reviewed-by: Kieran Kunhya <kierank@ob-encoder.com>
Reviewed-by: Clément Bœsch <u@pkh.me>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
This commit is contained in:
Ganesh Ajjanagadde 2015-12-16 13:28:39 -05:00
parent 5484cbe9f7
commit 0dd8a3d71e
1 changed files with 18 additions and 0 deletions
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18
libavutil/intmath.h
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@ -96,6 +96,9 @@ static av_always_inline av_const int ff_log2_16bit_c(unsigned int v)
#ifndef ff_ctzll
#define ff_ctzll(v) __builtin_ctzll(v)
#endif
#ifndef ff_clz
#define ff_clz(v) __builtin_clz(v)
#endif
#endif
#endif
@ -135,6 +138,21 @@ static av_always_inline av_const int ff_ctzll_c(long long v)
}
#endif
#ifndef ff_clz
#define ff_clz ff_clz_c
static av_always_inline av_const unsigned ff_clz_c(unsigned x)
{
unsigned i = sizeof(x) * 8;
while (x) {
x >>= 1;
i--;
}
return i;
}
#endif
/**
* @}
*/