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| author | James Almer <jamrial@gmail.com> | 2015-06-27 12:50:09 -0300 |
|---|---|---|
| committer | James Almer <jamrial@gmail.com> | 2015-06-27 12:56:55 -0300 |
| commit | 1e51e517be0acf1a5386a817706d0d0f605c4688 (patch) | |
| tree | bda6efa9bb0ea4827a242d852869df3d931d3d00 | |
| parent | 5cccbc3b74b2f8a838b643dec6fab5bf77918e1f (diff) | |
| download | ffmpeg-1e51e517be0acf1a5386a817706d0d0f605c4688.tar.gz | |
avutil/x86/intmath: use bzhi gcc builtin in av_mod_uintp2()
Signed-off-by: James Almer <jamrial@gmail.com>
| -rw-r--r-- | libavutil/x86/intmath.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/libavutil/x86/intmath.h b/libavutil/x86/intmath.h index c42fa8352b..85f15a4930 100644 --- a/libavutil/x86/intmath.h +++ b/libavutil/x86/intmath.h @@ -39,6 +39,12 @@ #if defined(__BMI2__) +#if AV_GCC_VERSION_AT_LEAST(5,1) +#define av_mod_uintp2 __builtin_ia32_bzhi_si +#else +/* GCC releases before 5.1.0 have a broken bzhi builtin, so for those we + * implement it using inline assembly + */ #define av_mod_uintp2 av_mod_uintp2_bmi2 static av_always_inline av_const unsigned av_mod_uintp2_bmi2(unsigned a, unsigned p) { @@ -50,6 +56,7 @@ static av_always_inline av_const unsigned av_mod_uintp2_bmi2(unsigned a, unsigne return x; } } +#endif /* AV_GCC_VERSION_AT_LEAST */ #endif /* __BMI2__ */ |