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computation, the Ancestor field is always set to the Parent, so we can remove the explicit link entirely and merge the Parent and Ancestor fields. Instead of checking for whether an ancestor exists for a node or not, we simply check whether the node has already been processed. This is simpler if Compress is inlined into Eval, so I did that as well. This is about a 3% speedup running -domtree on test-suite + SPEC2000 & SPEC2006, but it also opens up some opportunities for further improvement. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124061 91177308-0d34-0410-b5e6-96231b3b80d8
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