Revert r356996 "[DAG] Avoid smart constructor-based dangling nodes."

This patch appears to trigger very large compile time increases in
halide builds.

llvm-svn: 357116

2 files changed, 0 insertions, 15 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 4f6aa01cbc5..0b19b320f78 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -643,16 +643,6 @@ public:
   }
 };
 
-class WorklistInserter : public SelectionDAG::DAGUpdateListener {
-  DAGCombiner &DC;
-
-public:
-  explicit WorklistInserter(DAGCombiner &dc)
-      : SelectionDAG::DAGUpdateListener(dc.getDAG()), DC(dc) {}
-
-  void NodeInserted(SDNode *N) override { DC.AddToWorklist(N); }
-};
-
 } // end anonymous namespace
 
 //===----------------------------------------------------------------------===//
@@ -1405,8 +1395,6 @@ void DAGCombiner::Run(CombineLevel AtLevel) {
   LegalOperations = Level >= AfterLegalizeVectorOps;
   LegalTypes = Level >= AfterLegalizeTypes;
 
-  WorklistInserter AddNodes(*this);
-
   // Add all the dag nodes to the worklist.
   for (SDNode &Node : DAG.allnodes())
     AddToWorklist(&Node);
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 9534704a7dd..6648d1b089e 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -85,7 +85,6 @@ static SDVTList makeVTList(const EVT *VTs, unsigned NumVTs) {
 // Default null implementations of the callbacks.
 void SelectionDAG::DAGUpdateListener::NodeDeleted(SDNode*, SDNode*) {}
 void SelectionDAG::DAGUpdateListener::NodeUpdated(SDNode*) {}
-void SelectionDAG::DAGUpdateListener::NodeInserted(SDNode *) {}
 
 void SelectionDAG::DAGNodeDeletedListener::anchor() {}
 
@@ -834,8 +833,6 @@ void SelectionDAG::InsertNode(SDNode *N) {
   N->PersistentId = NextPersistentId++;
   VerifySDNode(N);
 #endif
-  for (DAGUpdateListener *DUL = UpdateListeners; DUL; DUL = DUL->Next)
-    DUL->NodeInserted(N);
 }
 
 /// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that