The WASM runtime https://wazero.io has a compiler on amd64 and arm64 (on Linux, macOS, Windows, and FreeBSD), but the current compiler while very fast (at compiling), is very naive (generates less than optimal code).
An optimizing compiler is currently being developed, and should be released in the coming months. I'm optimistic that this compiler will cover the performance gap between WASM and modernc.
Modernc/libc takes a rather different approach. It's got some pretty funny files in it. https://gitlab.com/cznic/libc/-/blob/master/musl_openbsd_arm...