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Clarify a deviation from the original algorithm.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46218 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -552,7 +552,10 @@ void StrongPHIElimination::processPHIUnion(MachineInstr* Inst,
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DomForestNode* child = *CI;
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// If the current node is live-out of the defining block of one of its
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// children, insert a copy for it
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// children, insert a copy for it. NOTE: The paper actually calls for
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// a more elaborate heuristic for determining whether to insert copies
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// for the child or the parent. In the interest of simplicity, we're
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// just always choosing the parent.
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if (isLiveOut(DFNode->getReg(),
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MRI.getVRegDef(child->getReg())->getParent(), MRI, LV)) {
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// Insert copies for parent
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