On Thu, Apr 18, 2024 at 10:11:08PM +0000, Devulapalli, Raghuveer wrote: >> 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 > avx512bw (I think the deprecated Xeon Phi processors falls in this > category) which is why we need both.
Makes sense, thanks. I'm planning to commit this fix sometime early next week. -- Nathan Bossart Amazon Web Services: https://aws.amazon.com