I don't mean mmx through avx2 when I said extensions. I mean the "vector length" extensions/flag for avx512 that lets you know you can use those instructions w

I don't mean mmx through avx2 when I said extensions. I mean the "vector length" extensions/flag for avx512 that lets you know you can use those instructions with xmm and ymm sized operands. Since it is a flag it means it is a theoretical optional feature whereas it should have just been part of the avx512 base. With the hindsight of what Intel want for avx10 there should have been flags for xmm, ymm, and zmm operands. That would be excellent for the "E" cores.