> On that note, is it necessary to also check for avx512f? At the moment, we
> are assuming that's supported if the other AVX-512 instructions are available.
No, it's not needed. There are no CPU's with avx512bw/avx512popcnt without
avx512f. Unfortunately though, avx512popcnt does not mean
> Thanks for the feedback. I've attached an updated patch.
(1) Shouldn't it be: return (_xgetbv(0) & 0xe6) == 0xe6; ? Otherwise
zmm_regs_available() will return false.
(2) Nitpick: avx512_popcnt_available and avx512_bw_available() run the same
cpuid leaf. You could combine them into one to
