alt Hacker News> There is no reason a portable_simd relu_dot implemention should need to specify the SIMD width.
What should it choose then? I have a Zen 3 processor, and benchmarking some simd I did recently says 32 byte or 64 byte chunks was fastest. But I'm sure I'd get a different result on a different Zen, and different again on Intel's.
How would the library decide what SIMD width I should use?
It'd need some kind of compile-time hardware-feature-detection, yea? That seems probably feasible since proc macros can do essentially anything they like (worryingly).