AVX-512 FMA count detection

[jeffhammond]

Would you like, or would you accept, contribution that detects the number of AVX-512 FMAs in Intel processors? This is important in math libraries because processors with 1 FMA often perform better using AVX2 (or AVX3-256) code paths because of the frequency issues discussed in #10.

I've already solved this problem in https://github.com/jeffhammond/vpu-count but would like to contribute to a more serious project that is addressing a range of use cases. I'm willing to maintain support for future hardware as long as I am in a position to do so and will document the methods required to maintain it.

[gchatelet]

Yes ! I would be very interested in these ! Thank you for the offer.