> A counterexample is the CRC32C code. AFAICT we assume the presence of > CPUID in that code (and #error otherwise). I imagine its probably safe to > assume the compiler understands CPUID if it understands AVX512 intrinsics, > but that is still mostly a guess.
If AVX-512 intrinsics are available, then yes you will have CPUID. CPUID is much older in the hardware/software timeline than AVX-512. Thanks, Paul
