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Besides the weight, we also want to store up to two root registers per unit. Most units will have a single root, the leaf register they represent. Units created for ad hoc aliasing get two roots: The two aliasing registers. The root registers can be used to compute the set of overlapping registers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156792 91177308-0d34-0410-b5e6-96231b3b80d8
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