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0ef8f3189e
PPC has an instruction for ctlz with defined zero behavior, and our lowering of cttz (provided by DAGCombine) is also efficient and branchless, so speculating these makes sense. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225150 91177308-0d34-0410-b5e6-96231b3b80d8
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