[PATCH] D116375: [X86] Use bit test instructions to optimize some logic atomic operations

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a comment.

This breaks -O0. Fast isel consumes the And, then we fall back to SelectionDAG, but the And is gone so it triggers the fatal error.

I'm uncomfortable with the cross pass requirements this approach depends on. It seems very fragile.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D116375/new/

https://reviews.llvm.org/D116375