[llvm] [AVR] Adapt getPostIndexedAddressParts() and getPreIndexedAddressParts (PR #145040)

[Tom Vijlbrief via llvm-commits]

tomtor wrote:

@benshi Thanks for the review.

What do you mean with "the generated .ll files have slight difference"? Which files are you comparing? Changing `if 1` to `if 0` in the test program and comparing the .ll or something else?



https://github.com/llvm/llvm-project/pull/145040