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I guess when mentioning Rust on Nordic controllers one should also mention these excellent projects
https://github.com/embassy-rs/embassy
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The value add is not in the parts that interface with the C64 internals; probably using C for that would make for nicer code. But I wanted to push as much into Rust as I could in the short amount of time I spent on this.
The real advantage of using Rust is in the actual program logic. E.g. the instructions are decoded into an algebraic datatype (in https://github.com/gergoerdi/chirp8-engine/blob/7623353a8bf0...) and then that is consumed in the virtual CPU (https://github.com/gergoerdi/chirp8-engine/blob/7623353a8bf0...). Rust's case-of-case optimization takes care of avoiding the intermediate data representation at runtime.
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The cool thing about LLVM-MOS specifically it that by using the zero page as virtual registers you sort-of get the same output with 'regular' code as opposed to this 'global variables' style of programming.
I recall a tutorial for 'cc65 optimizations'[0] which basically destroys a well-structured C program in order to do all of these optimizations (like making everything global) and it was absolutely terrible, code-wise. Well, the end result was probably fine, but it's just a shame these 'optimizations' were needed.
[0] I think it was this one: https://github.com/ilmenit/CC65-Advanced-Optimizations
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