[PATCH] D52944: AMDGPU: Add llvm.amdgcn.ds.ordered.add & swap

[Nicolai Hähnle via Phabricator via llvm-commits]

nhaehnle added a comment.

In https://reviews.llvm.org/D52944#1259919, @arsenm wrote:

> Does this need to be marked as isSourceOfDivergence?


Now that you mention it, yes, even though it's for stupid reasons: I believe the ds_ordered_count instruction executes only in a single lane, so it's intuitively a uniform operation; however, it returns its result only in lane 0, so it's formally non-uniform.


Repository:
  rL LLVM

https://reviews.llvm.org/D52944