Well Stockfish 13, the reference, is published in six exe: bmi2, avx2, sse4.1+popcount, sse3, 64bit and 32bit.Graham Banks wrote: ↑Wed Apr 21, 2021 5:09 am You'd be best doing what others do - a non-popcount exe, a popcount exe and a bmi2 exe.
The problem, for a rating list, is that all these versions should have a different rating as they do not perform as fast.
For example, on my computer amoeba 3.3 popcount is 28% faster than the non popcount version which could translate into ~15 Elo on a rating list. Mixing them will make the rating somewhat noisy I guess.