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Fix a problem Nate and Duraid reported where simplifying nodes can cause
them to get ressurected, in which case, deleting the undead nodes is unfriendly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26291 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -120,18 +120,22 @@ namespace {
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std::vector<SDNode*> NowDead;
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DAG.ReplaceAllUsesOfValueWith(TLO.Old, TLO.New, NowDead);
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// Push the new node and any (now) users onto the worklist.
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// Push the new node and any (possibly new) users onto the worklist.
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WorkList.push_back(TLO.New.Val);
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AddUsersToWorkList(TLO.New.Val);
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// Nodes can end up on the worklist more than once. Make sure we do
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// not process a node that has been replaced.
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removeFromWorkList(TLO.Old.Val);
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for (unsigned i = 0, e = NowDead.size(); i != e; ++i)
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removeFromWorkList(NowDead[i]);
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// Finally, since the node is now dead, remove it from the graph.
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DAG.DeleteNode(TLO.Old.Val);
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// Finally, if the node is now dead, remove it from the graph. The node
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// may not be dead if the replacement process recursively simplified to
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// something else needing this node.
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if (TLO.Old.Val->use_empty()) {
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removeFromWorkList(TLO.Old.Val);
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DAG.DeleteNode(TLO.Old.Val);
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}
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return true;
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}
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