[llvm-branch-commits] [llvm] AMDGPU: Simplify demanded bits on readlane/writeline index arguments (PR #117963)

[Jay Foad via llvm-branch-commits]

jayfoad wrote:

> If we have out of bounds indexing, these will now clamp down to
> a low bit which may CSE with the operations on the low half of the
> wave.

Should mention that in the comment in the code. It was not clear to me why you would want to clamp constants.

https://github.com/llvm/llvm-project/pull/117963