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At the moment compiler-builtins isn't useful for AVR, because that platform uses a custom calling convention for intrinsics - supporting AVR here would require:
- Implementing this custom calling convention in LLVM.
- Exposing it in rustc.
- Finally, using it within compiler-builtins.
There are no ongoing plans to do so yet, but over rust-lang/rust#131651 it was pointed out it would be nice to have some kind of message of this issue left, so here we go 🙂
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