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e233e19ac6
The rule that turns a sub to xor if the LHS is 2^n-1 and the remaining bits are known zero, does not use the demanded bits at all: Move it to the normal InstCombine code path. Differential Revision: http://reviews.llvm.org/D9417 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236268 91177308-0d34-0410-b5e6-96231b3b80d8
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