diff options
| author | Conrad Meyer <cem@FreeBSD.org> | 2018-10-22 19:50:43 +0000 |
|---|---|---|
| committer | Conrad Meyer <cem@FreeBSD.org> | 2018-10-22 19:50:43 +0000 |
| commit | 42239e68a5cfba3b37b054425eace8d14e0844e3 (patch) | |
| tree | aa5c91feac3537b39efa3d9e5f85b3315206a6ed /lib/common/compiler.h | |
| parent | 1767cc4987b68ace957ea34c20634485d4232611 (diff) | |
Diffstat (limited to 'lib/common/compiler.h')
| -rw-r--r-- | lib/common/compiler.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/lib/common/compiler.h b/lib/common/compiler.h index 3a7553c3807ee..e90a3bcde36ce 100644 --- a/lib/common/compiler.h +++ b/lib/common/compiler.h @@ -63,6 +63,31 @@ # endif #endif +/* target attribute */ +#ifndef __has_attribute + #define __has_attribute(x) 0 /* Compatibility with non-clang compilers. */ +#endif +#if defined(__GNUC__) +# define TARGET_ATTRIBUTE(target) __attribute__((__target__(target))) +#else +# define TARGET_ATTRIBUTE(target) +#endif + +/* Enable runtime BMI2 dispatch based on the CPU. + * Enabled for clang & gcc >=4.8 on x86 when BMI2 isn't enabled by default. + */ +#ifndef DYNAMIC_BMI2 + #if (defined(__clang__) && __has_attribute(__target__)) \ + || (defined(__GNUC__) \ + && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))) \ + && (defined(__x86_64__) || defined(_M_X86)) \ + && !defined(__BMI2__) + # define DYNAMIC_BMI2 1 + #else + # define DYNAMIC_BMI2 0 + #endif +#endif + /* prefetch */ #if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_I86)) /* _mm_prefetch() is not defined outside of x86/x64 */ # include <mmintrin.h> /* https://msdn.microsoft.com/fr-fr/library/84szxsww(v=vs.90).aspx */ |