ffmpeg | branch: master | James Almer <jamr...@gmail.com> | Wed Mar 18 22:43:33 2015 -0300| [60b9373dbd52bba91d2286d5f8a1366090a9df08] | committer: James Almer
libavutil: add bmi2 optimized av_mod_uintp2 Reviewed-by: Michael Niedermayer <michae...@gmx.at> Signed-off-by: James Almer <jamr...@gmail.com> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=60b9373dbd52bba91d2286d5f8a1366090a9df08 --- libavutil/x86/intmath.h | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/libavutil/x86/intmath.h b/libavutil/x86/intmath.h index 7aa6bc4..c42fa83 100644 --- a/libavutil/x86/intmath.h +++ b/libavutil/x86/intmath.h @@ -24,15 +24,35 @@ #include <stdint.h> #include "config.h" +#if defined(__GNUC__) + /* Our generic version of av_popcount is faster than GCC's built-in on * CPUs that don't support the popcnt instruction. */ -#if defined(__GNUC__) && defined(__POPCNT__) +#if defined(__POPCNT__) #define av_popcount __builtin_popcount #if ARCH_X86_64 #define av_popcount64 __builtin_popcountll #endif -#endif /* defined(__GNUC__) && defined(__POPCNT__) */ +#endif /* __POPCNT__ */ + +#if defined(__BMI2__) + +#define av_mod_uintp2 av_mod_uintp2_bmi2 +static av_always_inline av_const unsigned av_mod_uintp2_bmi2(unsigned a, unsigned p) +{ + if (av_builtin_constant_p(p)) + return a & ((1 << p) - 1); + else { + unsigned x; + __asm__ ("bzhi %2, %1, %0 \n\t" : "=r"(x) : "rm"(a), "r"(p)); + return x; + } +} + +#endif /* __BMI2__ */ + +#endif /* __GNUC__ */ #endif /* AVUTIL_X86_INTMATH_H */ _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
