I'm not proficient in Rust, but API wise I'd conceptually define types like f32xn or f32s, which have the number of elements that fit into a vector register for

I'm not proficient in Rust, but API wise I'd conceptually define types like f32xn or f32s, which have the number of elements that fit into a vector register for your target architecture, so 4 for NEON/SSE, 8 for AVX and 16 for AVX512. I can recommens lookig at the highway library: https://github.com/google/highway https://github.com/google/highway