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Native support for AVR instrinsics #711

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@Patryk27

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@Patryk27

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:

  1. Implementing this custom calling convention in LLVM.
  2. Exposing it in rustc.
  3. 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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