Most reasonable IMO would be a hypothetical AVX-256 that was AVX-512 minus ZMM registers. Intel chose against that. So the only reasonable options for a big li

Most reasonable IMO would be a hypothetical AVX-256 that was AVX-512 minus ZMM registers. Intel chose against that. So the only reasonable options for a big little system are: 1. Not have a big little system. But little cores are quite useful for power efficiency in laptops… 2. Don’t support AVX-512 on any cores. Everything beyond AVX2 becomes a dead extension outside of server chips. 3. The little cores support AVX-512 as best as is reasonable. Then thread director can weight AVX-512 usage even heavier than it already weights AVX2. Also AVX2 performance on Alder Lake is already different between the cores enough that optimal implementations can be different.