C++ comes with a runtime which, among many other things, allows you to detect the microarchitecture and featureset of the environment you're running on using `_

C++ comes with a runtime which, among many other things, allows you to detect the microarchitecture and featureset of the environment you're running on using `__builtin_cpu_init()` which calls a dynamically linked function `__cpu_indicator_init()`. Then using the `cpu_dispatch`, `target`, or `target_clones` attributes you can compile multiple variations of an algorithm in your program and dynamically select the one to execute. This is referred to as a "fat binary", and the feature is "multifunctions" or "multiversioned functions". Zig intends to support a similar feature but doesn't yet, at least not built into the language (you could certainly express this if you tried hard enough). I don't know about Rust, but I would be very surprised if it can't do this. edit: I think I replied to the wrong comment >.<