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Make ISel ignore dead nodes. The DAGCombiner normally eliminates
dead nodes, but in this case its missing one. Fixing the DAGCombiner is desirable, but it's somewhat involved. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58777 91177308-0d34-0410-b5e6-96231b3b80d8
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@@ -108,6 +108,11 @@ void SelectRoot(SelectionDAG &DAG) {
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// node).
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while (ISelPosition != CurDAG->allnodes_begin()) {
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SDNode *Node = --ISelPosition;
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// Skip dead nodes. DAGCombiner is expected to eliminate all dead nodes,
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// but there are currently some corner cases that it misses. Also, this
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// makes it theoretically possible to disable the DAGCombiner.
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if (Node->use_empty())
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continue;
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#if 0
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DAG.setSubgraphColor(Node, "red");
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#endif
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