ffmpeg | branch: master | Ganesh Ajjanagadde <gajjanaga...@gmail.com> | Wed Dec 16 13:28:39 2015 -0500| [0dd8a3d71e2c01d42e868d6c6b8974fadfcc529e] | committer: Ganesh Ajjanagadde
lavu/intmath: add faster clz support This should be useful for the sofalizer filter. Reviewed-by: Kieran Kunhya <kier...@ob-encoder.com> Reviewed-by: Clément Bœsch <u...@pkh.me> Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0dd8a3d71e2c01d42e868d6c6b8974fadfcc529e --- libavutil/intmath.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/libavutil/intmath.h b/libavutil/intmath.h index 2016723..82193a6 100644 --- a/libavutil/intmath.h +++ b/libavutil/intmath.h @@ -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 + /** * @} */ _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
