Commit 3924ebceb52fc0fe61ac8981d66212d132510285
2016-07-13T16:03:36
AVX2: Perform additional checks for O/S support cpuid tells us whether the O/S uses extended state management via XSAVE/XRSTOR, but we have to call xgetbv to verify that it is using XSAVE/XRSTOR to manage the state of XMM/YMM registers.