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This combine is fully handled by SimplifyDemandedInstructionBits as of r299658 where I fixed this code to ensure the Add/Sub had only a single user. Otherwise it would fire and create additional instructions. That fix resulted in an improvement to code generated for tsan which is why I committed it before deleting. Differential Revision: https://reviews.llvm.org/D31543 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@299704 91177308-0d34-0410-b5e6-96231b3b80d8
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