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eee7a7a836
Lowering this new node allows us to fold the almost universal comparison for success before it's even formed. Instead we can create a copy from EFLAGS and an X86ISD::SETCC operation since all "cmpxchg" instructions set the zero-flag to the correct value. rdar://problem/13201607 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210923 91177308-0d34-0410-b5e6-96231b3b80d8
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