diff options
Diffstat (limited to 'libavutil/x86/intmath.h')
| -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__ */ |