From c6dfaa0e836c1b63366b1010157538d9c346a8b3 Mon Sep 17 00:00:00 2001
From: Nirav Dave <niravd@google.com>
Date: Wed, 27 Mar 2019 19:54:41 +0000
Subject: 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
---
 llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 12 ------------
 1 file changed, 12 deletions(-)

(limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')

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);
-- 
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