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Thanks, that's an important caveat!

> Meanwhile xsimd (https://github.com/xtensor-stack/xsimd) has the feature level as a template parameter on its vector objects

That's pretty cool because you can write function templates and instantiate different versions that you can select at runtime.

Yeah thts the fun of it, you create your kernel/function so that the simd level is a template parameter, and then you can use simple branching like:

if(supports<avx512>){ myAlgo<avx512>(); } else{ myAlgo<avx>(); }

Ive also used it for benchmarking to see if my code scales to different simd widths well and its a huge help

FYI: You don't want to do this. `supports<avx512>` is an expensive check. You really want to put this check in a static.

I guess this was just pseudo-code. Of course you don't want to do a runtime feature check over and over again.