[spacechild1]

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.

[vblanco]

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

[dyaroshev]

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

[spacechild1]

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