[PATCH] D77213: Handle part-word LL/SC in atomic expansion pass

[Brian Cain via Phabricator via llvm-commits]

bcain added a comment.

In D77213#2003730 <https://reviews.llvm.org/D77213#2003730>, @bcain wrote:

> If I apply this patch I am still able to encounter this `unreachable` during a build.  I can share repro details.


Here's a test case that triggers here:

  %struct.a = type { i8 }
  define void @b()  {
          %d = alloca %struct.a%c = getelementptr %struct.a, %struct.a* %d, i32 0, i32 0   atomicrmw add i8* %c, i8 2 monotonic
  ret void
  }


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D77213/new/

https://reviews.llvm.org/D77213