Valid points, but I am doing exactly that full-time for the past years :) Including compression and quicksort, which are nontrivial uses of SIMD. The 2x128 is

Valid points, but I am doing exactly that full-time for the past years :) Including compression and quicksort, which are nontrivial uses of SIMD. The 2x128 is handled by adopting AVX2 semantics for our InterleaveLower/Upper op, and when we want the extra fixup, there is also InterleaveWholeLower. I agree AVX-512 is awesome, it's my favorite target. Some of its useful ops (compress[store]) are fine to emulate. What idioms did you have in mind that don't translate? Spot on about PMOVMSKB, that's a pain point. We provide several ops to replace it with more relaxed semantics that are easier to emulate on other platforms, for example AllTrue, CountTrue, AllFalse. (I think DanilaK's NEON VSHRN trick is faster than the one from your first link?)