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17ca0f8f80
The SWAP instruction only exists in a 32-bit variant, but the 64-bit atomic swap can be implemented in terms of CASX, like the other atomic rmw primitives. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200453 91177308-0d34-0410-b5e6-96231b3b80d8