diff options
| author | James Almer <jamrial@gmail.com> | 2015-03-19 04:43:33 +0300 |
|---|---|---|
| committer | James Almer <jamrial@gmail.com> | 2015-03-20 21:47:43 +0300 |
| commit | 60b9373dbd52bba91d2286d5f8a1366090a9df08 (patch) | |
| tree | cf66d9f3900a6f19b92b93dbac9716c442f31d13 /libavutil | |
| parent | d13e521cc861e791545dd6022fbf93f821e33618 (diff) | |
libavutil: add bmi2 optimized av_mod_uintp2
Reviewed-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: James Almer <jamrial@gmail.com>
Diffstat (limited to 'libavutil')
| -rw-r--r-- | libavutil/x86/intmath.h | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/libavutil/x86/intmath.h b/libavutil/x86/intmath.h index 7aa6bc42fb..c42fa8352b 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 */ |