[PATCH] D58632: [X86] Improve lowering of idemptotent RMW operations

[Sam McCall via Phabricator via llvm-commits]

sammccall added a comment.

@craig.topper doh, I'm a frontend person and somehow forgot about llc vs opt. I'll get a repro and attach it.

@reames Yes please, reverting until we can address this symptom would be really useful. We try to integrate daily (which is how we found this), and it gets much harder the longer a breakage lasts.


Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D58632/new/

https://reviews.llvm.org/D58632