[llvm] [AVR] Add AVR MOVW/ADIW/SUBIW disassembly (PR #146360)

[Patryk Wychowaniec via llvm-commits]

Patryk27 wrote:

I can add a comment up-front - is it possible to test this code? Not sure if we have some tests for the disassembler (afk at the moment), but I'd expect a couple.

https://github.com/llvm/llvm-project/pull/146360