[PATCH] D57748: AMDGPU: Add inverse ballot intrinsic

[Connor Abbott via Phabricator via llvm-commits]

cwabbott added a comment.

Adding a pattern for this wouldn't work for what I wanted to do, which was a ballot/inverseballot pair to operate directly on the bitmask representation of a boolean, since there's a bug where SelectionDAG forgets that ballot removes divergence, and it needs to be non-divergent for the pattern to fire. That being said, inserting two readlanes isn't that much better, so maybe I should just fix that instead...


Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D57748/new/

https://reviews.llvm.org/D57748