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

[Philip Reames via Phabricator via llvm-commits]

reames updated this revision to Diff 188385.
reames added a comment.

Add tests requested by JF


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

https://reviews.llvm.org/D58632

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/atomic-idempotent.ll

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