/* Check if the OS supports executing AVX instructions. */ #define XCR_XFEATURE_ENABLED_MASK 0x0 #define XSTATE_FP 0x1 #define XSTATE_SSE 0x2 #define XSTATE_YMM 0x4 static int avx_os_support (void) { unsigned int eax, edx; unsigned int ecx = XCR_XFEATURE_ENABLED_MASK; __asm__ ("xgetbv" : "=a" (eax), "=d" (edx) : "c" (ecx)); return (eax & (XSTATE_SSE | XSTATE_YMM)) == (XSTATE_SSE | XSTATE_YMM); }