diff options
| -rw-r--r-- | volk/tmpl/volk_cpu.tmpl.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/volk/tmpl/volk_cpu.tmpl.c b/volk/tmpl/volk_cpu.tmpl.c index e0a0e91de..b312c4485 100644 --- a/volk/tmpl/volk_cpu.tmpl.c +++ b/volk/tmpl/volk_cpu.tmpl.c @@ -44,12 +44,16 @@ struct VOLK_CPU volk_cpu; * This function will bomb on non-AVX-capable machines, so * check for AVX capability before executing. */ - static inline unsigned int __xgetbv(void) - { - unsigned int index, __eax, __edx; - __asm__ ("xgetbv" : "=a"(__eax), "=d"(__edx) : "c" (index)); - return __eax; + #if defined(__GNUC_PREREQ) && __GNUC_PREREQ(4, 4) + static inline unsigned long long _xgetbv(unsigned int index){ + unsigned int eax, edx; + __asm__ __volatile__("xgetbv" : "=a"(eax), "=d"(edx) : "c"(index)); + return ((unsigned long long)edx << 32) | eax; } + #define __xgetbv() _xgetbv(0) + #else + #define __xgetbv() 0 + #endif //implement get cpuid for MSVC compilers using __cpuid intrinsic #elif defined(_MSC_VER) && defined(HAVE_INTRIN_H) |