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a4a812fedd
We can only propagate the nsw bits if both subtraction instructions are marked with the appropriate bit. N.B. We only propagate the nsw bit in InstCombine because the nuw case is already handled in InstSimplify. This fixes PR20189. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214385 91177308-0d34-0410-b5e6-96231b3b80d8 |
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