[llvm-branch-commits] [llvm] AMDGPU: Replace unused update.dpp inputs with poison instead of undef (PR #131287)

[Matt Arsenault via llvm-branch-commits]

arsenm wrote:

> My concern is that it is not obvious when the semantics allow it, when you have a plethora of undocumented target intrinsics. I guess the grown-up solution is to document them properly.

Yes, the intrinsics should have the edge cases all specified. I also assume this is why you can specify noundef on specific parameters 

https://github.com/llvm/llvm-project/pull/131287