Track IR ordering of SelectionDAG nodes 3/4.

Remove the old IR ordering mechanism and switch to new one.  Fix unit
test failures.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182704 91177308-0d34-0410-b5e6-96231b3b80d8

10 files changed, 17 insertions, 165 deletions

diff --git a/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp b/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
index d86a3408e3..02dfb7b2f5 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
@@ -735,9 +735,6 @@ void DAGTypeLegalizer::SetPromotedInteger(SDValue Op, SDValue Result) {
   SDValue &OpEntry = PromotedIntegers[Op];
   assert(OpEntry.getNode() == 0 && "Node is already promoted!");
   OpEntry = Result;
-
-  // Propagate node ordering
-  DAG.AssignOrdering(Result.getNode(), DAG.GetOrdering(Op.getNode()));
 }
 
 void DAGTypeLegalizer::SetSoftenedFloat(SDValue Op, SDValue Result) {
@@ -749,9 +746,6 @@ void DAGTypeLegalizer::SetSoftenedFloat(SDValue Op, SDValue Result) {
   SDValue &OpEntry = SoftenedFloats[Op];
   assert(OpEntry.getNode() == 0 && "Node is already converted to integer!");
   OpEntry = Result;
-
-  // Propagate node ordering
-  DAG.AssignOrdering(Result.getNode(), DAG.GetOrdering(Op.getNode()));
 }
 
 void DAGTypeLegalizer::SetScalarizedVector(SDValue Op, SDValue Result) {
@@ -766,9 +760,6 @@ void DAGTypeLegalizer::SetScalarizedVector(SDValue Op, SDValue Result) {
   SDValue &OpEntry = ScalarizedVectors[Op];
   assert(OpEntry.getNode() == 0 && "Node is already scalarized!");
   OpEntry = Result;
-
-  // Propagate node ordering
-  DAG.AssignOrdering(Result.getNode(), DAG.GetOrdering(Op.getNode()));
 }
 
 void DAGTypeLegalizer::GetExpandedInteger(SDValue Op, SDValue &Lo,
@@ -796,10 +787,6 @@ void DAGTypeLegalizer::SetExpandedInteger(SDValue Op, SDValue Lo,
   assert(Entry.first.getNode() == 0 && "Node already expanded");
   Entry.first = Lo;
   Entry.second = Hi;
-
-  // Propagate ordering
-  DAG.AssignOrdering(Lo.getNode(), DAG.GetOrdering(Op.getNode()));
-  DAG.AssignOrdering(Hi.getNode(), DAG.GetOrdering(Op.getNode()));
 }
 
 void DAGTypeLegalizer::GetExpandedFloat(SDValue Op, SDValue &Lo,
@@ -827,10 +814,6 @@ void DAGTypeLegalizer::SetExpandedFloat(SDValue Op, SDValue Lo,
   assert(Entry.first.getNode() == 0 && "Node already expanded");
   Entry.first = Lo;
   Entry.second = Hi;
-
-  // Propagate ordering
-  DAG.AssignOrdering(Lo.getNode(), DAG.GetOrdering(Op.getNode()));
-  DAG.AssignOrdering(Hi.getNode(), DAG.GetOrdering(Op.getNode()));
 }
 
 void DAGTypeLegalizer::GetSplitVector(SDValue Op, SDValue &Lo,
@@ -860,10 +843,6 @@ void DAGTypeLegalizer::SetSplitVector(SDValue Op, SDValue Lo,
   assert(Entry.first.getNode() == 0 && "Node already split");
   Entry.first = Lo;
   Entry.second = Hi;
-
-  // Propagate ordering
-  DAG.AssignOrdering(Lo.getNode(), DAG.GetOrdering(Op.getNode()));
-  DAG.AssignOrdering(Hi.getNode(), DAG.GetOrdering(Op.getNode()));
 }
 
 void DAGTypeLegalizer::SetWidenedVector(SDValue Op, SDValue Result) {
@@ -875,9 +854,6 @@ void DAGTypeLegalizer::SetWidenedVector(SDValue Op, SDValue Result) {
   SDValue &OpEntry = WidenedVectors[Op];
   assert(OpEntry.getNode() == 0 && "Node already widened!");
   OpEntry = Result;
-
-  // Propagate node ordering
-  DAG.AssignOrdering(Result.getNode(), DAG.GetOrdering(Op.getNode()));
 }
 
 
@@ -945,8 +921,6 @@ bool DAGTypeLegalizer::CustomLowerNode(SDNode *N, EVT VT, bool LegalizeResult) {
          "Custom lowering returned the wrong number of results!");
   for (unsigned i = 0, e = Results.size(); i != e; ++i) {
     ReplaceValueWith(SDValue(N, i), Results[i]);
-    // Propagate node ordering
-    DAG.AssignOrdering(Results[i].getNode(), DAG.GetOrdering(N));
   }
   return true;
 }
diff --git a/lib/CodeGen/SelectionDAG/SDNodeOrdering.h b/lib/CodeGen/SelectionDAG/SDNodeOrdering.h
deleted file mode 100644
index 7e7b8974be..0000000000
--- a/lib/CodeGen/SelectionDAG/SDNodeOrdering.h
+++ /dev/null
@@ -1,56 +0,0 @@
-//===-- llvm/CodeGen/SDNodeOrdering.h - SDNode Ordering ---------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file declares the SDNodeOrdering class.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_CODEGEN_SDNODEORDERING_H
-#define LLVM_CODEGEN_SDNODEORDERING_H
-
-#include "llvm/ADT/DenseMap.h"
-
-namespace llvm {
-
-class SDNode;
-
-/// SDNodeOrdering - Maps a unique (monotonically increasing) value to each
-/// SDNode that roughly corresponds to the ordering of the original LLVM
-/// instruction. This is used for turning off scheduling, because we'll forgo
-/// the normal scheduling algorithms and output the instructions according to
-/// this ordering.
-class SDNodeOrdering {
-  DenseMap<const SDNode*, unsigned> OrderMap;
-
-  void operator=(const SDNodeOrdering&) LLVM_DELETED_FUNCTION;
-  SDNodeOrdering(const SDNodeOrdering&) LLVM_DELETED_FUNCTION;
-public:
-  SDNodeOrdering() {}
-
-  void add(const SDNode *Node, unsigned NewOrder) {
-    unsigned &OldOrder = OrderMap[Node];
-    if (OldOrder == 0 || (OldOrder > 0 && NewOrder < OldOrder))
-      OldOrder = NewOrder;
-  }
-  void remove(const SDNode *Node) {
-    DenseMap<const SDNode*, unsigned>::iterator Itr = OrderMap.find(Node);
-    if (Itr != OrderMap.end())
-      OrderMap.erase(Itr);
-  }
-  void clear() {
-    OrderMap.clear();
-  }
-  unsigned getOrder(const SDNode *Node) {
-    return OrderMap[Node];
-  }
-};
-
-} // end llvm namespace
-
-#endif
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
index c009cfcc51..75ef116de2 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
@@ -1692,7 +1692,7 @@ public:
   unsigned getNodeOrdering(const SUnit *SU) const {
     if (!SU->getNode()) return 0;
 
-    return scheduleDAG->DAG->GetOrdering(SU->getNode());
+    return SU->getNode()->getIROrder();
   }
 
   bool empty() const { return Queue.empty(); }
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
index b22440daf1..a5de9db6af 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
@@ -736,7 +736,7 @@ static void ProcessSourceNode(SDNode *N, SelectionDAG *DAG,
                            DenseMap<SDValue, unsigned> &VRBaseMap,
                     SmallVector<std::pair<unsigned, MachineInstr*>, 32> &Orders,
                            SmallSet<unsigned, 8> &Seen) {
-  unsigned Order = DAG->GetOrdering(N);
+  unsigned Order = N->getIROrder();
   if (!Order || !Seen.insert(Order)) {
     // Process any valid SDDbgValues even if node does not have any order
     // assigned.
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index c43f96ea83..affd9e08dc 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -13,7 +13,6 @@
 
 #include "llvm/CodeGen/SelectionDAG.h"
 #include "SDNodeDbgValue.h"
-#include "SDNodeOrdering.h"
 #include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallSet.h"
@@ -636,9 +635,6 @@ void SelectionDAG::DeallocateNode(SDNode *N) {
 
   NodeAllocator.Deallocate(AllNodes.remove(N));
 
-  // Remove the ordering of this node.
-  Ordering->remove(N);
-
   // If any of the SDDbgValue nodes refer to this SDNode, invalidate them.
   ArrayRef<SDDbgValue*> DbgVals = DbgInfo->getSDDbgValues(N);
   for (unsigned i = 0, e = DbgVals.size(); i != e; ++i)
@@ -876,9 +872,8 @@ SelectionDAG::SelectionDAG(const TargetMachine &tm, CodeGenOpt::Level OL)
   : TM(tm), TLI(*tm.getTargetLowering()), TSI(*tm.getSelectionDAGInfo()),
     TTI(0), OptLevel(OL), EntryNode(ISD::EntryToken, 0, DebugLoc(),
                                     getVTList(MVT::Other)),
-    Root(getEntryNode()), Ordering(0), UpdateListeners(0) {
+    Root(getEntryNode()), UpdateListeners(0) {
   AllNodes.push_back(&EntryNode);
-  Ordering = new SDNodeOrdering();
   DbgInfo = new SDDbgInfo();
 }
 
@@ -891,7 +886,6 @@ void SelectionDAG::init(MachineFunction &mf, const TargetTransformInfo *tti) {
 SelectionDAG::~SelectionDAG() {
   assert(!UpdateListeners && "Dangling registered DAGUpdateListeners");
   allnodes_clear();
-  delete Ordering;
   delete DbgInfo;
 }
 
@@ -918,7 +912,6 @@ void SelectionDAG::clear() {
   EntryNode.UseList = 0;
   AllNodes.push_back(&EntryNode);
   Root = getEntryNode();
-  Ordering->clear();
   DbgInfo->clear();
 }
 
@@ -3470,10 +3463,10 @@ static SDValue getMemsetStringVal(EVT VT, SDLoc dl, SelectionDAG &DAG,
 
 /// getMemBasePlusOffset - Returns base and offset node for the
 ///
-static SDValue getMemBasePlusOffset(SDValue Base, unsigned Offset,
+static SDValue getMemBasePlusOffset(SDValue Base, unsigned Offset, SDLoc dl,
                                       SelectionDAG &DAG) {
   EVT VT = Base.getValueType();
-  return DAG.getNode(ISD::ADD, SDLoc(Base),
+  return DAG.getNode(ISD::ADD, dl,
                      VT, Base, DAG.getConstant(Offset, VT));
 }
 
@@ -3687,7 +3680,7 @@ static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG, SDLoc dl,
       Value = getMemsetStringVal(VT, dl, DAG, TLI, Str.substr(SrcOff));
       if (Value.getNode())
         Store = DAG.getStore(Chain, dl, Value,
-                             getMemBasePlusOffset(Dst, DstOff, DAG),
+                             getMemBasePlusOffset(Dst, DstOff, dl, DAG),
                              DstPtrInfo.getWithOffset(DstOff), isVol,
                              false, Align);
     }
@@ -3701,11 +3694,11 @@ static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG, SDLoc dl,
       EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
       assert(NVT.bitsGE(VT));
       Value = DAG.getExtLoad(ISD::EXTLOAD, dl, NVT, Chain,
-                             getMemBasePlusOffset(Src, SrcOff, DAG),
+                             getMemBasePlusOffset(Src, SrcOff, dl, DAG),
                              SrcPtrInfo.getWithOffset(SrcOff), VT, isVol, false,
                              MinAlign(SrcAlign, SrcOff));
       Store = DAG.getTruncStore(Chain, dl, Value,
-                                getMemBasePlusOffset(Dst, DstOff, DAG),
+                                getMemBasePlusOffset(Dst, DstOff, dl, DAG),
                                 DstPtrInfo.getWithOffset(DstOff), VT, isVol,
                                 false, Align);
     }
@@ -3774,7 +3767,7 @@ static SDValue getMemmoveLoadsAndStores(SelectionDAG &DAG, SDLoc dl,
     SDValue Value, Store;
 
     Value = DAG.getLoad(VT, dl, Chain,
-                        getMemBasePlusOffset(Src, SrcOff, DAG),
+                        getMemBasePlusOffset(Src, SrcOff, dl, DAG),
                         SrcPtrInfo.getWithOffset(SrcOff), isVol,
                         false, false, SrcAlign);
     LoadValues.push_back(Value);
@@ -3790,7 +3783,7 @@ static SDValue getMemmoveLoadsAndStores(SelectionDAG &DAG, SDLoc dl,
     SDValue Value, Store;
 
     Store = DAG.getStore(Chain, dl, LoadValues[i],
-                         getMemBasePlusOffset(Dst, DstOff, DAG),
+                         getMemBasePlusOffset(Dst, DstOff, dl, DAG),
                          DstPtrInfo.getWithOffset(DstOff), isVol, false, Align);
     OutChains.push_back(Store);
     DstOff += VTSize;
@@ -3872,7 +3865,7 @@ static SDValue getMemsetStores(SelectionDAG &DAG, SDLoc dl,
     }
     assert(Value.getValueType() == VT && "Value with wrong type.");
     SDValue Store = DAG.getStore(Chain, dl, Value,
-                                 getMemBasePlusOffset(Dst, DstOff, DAG),
+                                 getMemBasePlusOffset(Dst, DstOff, dl, DAG),
                                  DstPtrInfo.getWithOffset(DstOff),
                                  isVol, false, Align);
     OutChains.push_back(Store);
@@ -5865,18 +5858,6 @@ unsigned SelectionDAG::AssignTopologicalOrder() {
   return DAGSize;
 }
 
-/// AssignOrdering - Assign an order to the SDNode.
-void SelectionDAG::AssignOrdering(const SDNode *SD, unsigned Order) {
-  assert(SD && "Trying to assign an order to a null node!");
-  Ordering->add(SD, Order);
-}
-
-/// GetOrdering - Get the order for the SDNode.
-unsigned SelectionDAG::GetOrdering(const SDNode *SD) const {
-  assert(SD && "Trying to get the order of a null node!");
-  return Ordering->getOrder(SD);
-}
-
 /// AddDbgValue - Add a dbg_value SDNode. If SD is non-null that means the
 /// value is produced by SD.
 void SelectionDAG::AddDbgValue(SDDbgValue *DB, SDNode *SD, bool isParameter) {
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index dd46bb4838..aae11794eb 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -938,19 +938,13 @@ SDValue SelectionDAGBuilder::getControlRoot() {
   return Root;
 }
 
-void SelectionDAGBuilder::AssignOrderingToNode(const SDNode *Node) {
-  if (DAG.GetOrdering(Node) != 0) return; // Already has ordering.
-  DAG.AssignOrdering(Node, SDNodeOrder);
-
-  for (unsigned I = 0, E = Node->getNumOperands(); I != E; ++I)
-    AssignOrderingToNode(Node->getOperand(I).getNode());
-}
-
 void SelectionDAGBuilder::visit(const Instruction &I) {
   // Set up outgoing PHI node register values before emitting the terminator.
   if (isa<TerminatorInst>(&I))
     HandlePHINodesInSuccessorBlocks(I.getParent());
 
+  ++SDNodeOrder;
+
   CurInst = &I;
 
   visit(I.getOpcode(), I);
@@ -975,12 +969,6 @@ void SelectionDAGBuilder::visit(unsigned Opcode, const User &I) {
     case Instruction::OPCODE: visit##OPCODE((const CLASS&)I); break;
 #include "llvm/IR/Instruction.def"
   }
-
-  // Assign the ordering to the freshly created DAG nodes.
-  if (NodeMap.count(&I)) {
-    ++SDNodeOrder;
-    AssignOrderingToNode(getValue(&I).getNode());
-  }
 }
 
 // resolveDanglingDebugInfo - if we saw an earlier dbg_value referring to V,
@@ -3397,8 +3385,6 @@ void SelectionDAGBuilder::visitStore(const StoreInst &I) {
 
   SDValue StoreNode = DAG.getNode(ISD::TokenFactor, getCurSDLoc(),
                                   MVT::Other, &Chains[0], ChainI);
-  ++SDNodeOrder;
-  AssignOrderingToNode(StoreNode.getNode());
   DAG.setRoot(StoreNode);
 }
 
@@ -3652,12 +3638,6 @@ void SelectionDAGBuilder::visitTargetIntrinsic(const CallInst &I,
     }
 
     setValue(&I, Result);
-  } else {
-    // Assign order to result here. If the intrinsic does not produce a result,
-    // it won't be mapped to a SDNode and visit() will not assign it an order
-    // number.
-    ++SDNodeOrder;
-    AssignOrderingToNode(Result.getNode());
   }
 }
 
@@ -4525,12 +4505,6 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
       return 0;
     }
 
-    // Build an entry in DbgOrdering.  Debug info input nodes get an SDNodeOrder
-    // but do not always have a corresponding SDNode built.  The SDNodeOrder
-    // absolute, but not relative, values are different depending on whether
-    // debug info exists.
-    ++SDNodeOrder;
-
     // Check if address has undef value.
     if (isa<UndefValue>(Address) ||
         (Address->use_empty() && !isa<Argument>(Address))) {
@@ -4610,11 +4584,6 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
     if (!V)
       return 0;
 
-    // Build an entry in DbgOrdering.  Debug info input nodes get an SDNodeOrder
-    // but do not always have a corresponding SDNode built.  The SDNodeOrder
-    // absolute, but not relative, values are different depending on whether
-    // debug info exists.
-    ++SDNodeOrder;
     SDDbgValue *SDV;
     if (isa<ConstantInt>(V) || isa<ConstantFP>(V) || isa<UndefValue>(V)) {
       SDV = DAG.getDbgValue(Variable, V, Offset, dl, SDNodeOrder);
@@ -5347,18 +5316,12 @@ void SelectionDAGBuilder::LowerCallTo(ImmutableCallSite CS, SDValue Callee,
                          &Values[0], Values.size()));
   }
 
-  // Assign order to nodes here. If the call does not produce a result, it won't
-  // be mapped to a SDNode and visit() will not assign it an order number.
   if (!Result.second.getNode()) {
     // As a special case, a null chain means that a tail call has been emitted and
     // the DAG root is already updated.
     HasTailCall = true;
-    ++SDNodeOrder;
-    AssignOrderingToNode(DAG.getRoot().getNode());
   } else {
     DAG.setRoot(Result.second);
-    ++SDNodeOrder;
-    AssignOrderingToNode(Result.second.getNode());
   }
 
   if (LandingPad) {
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
index ac6cedb586..bff92ca551 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
@@ -377,11 +377,6 @@ public:
 
   void CopyValueToVirtualRegister(const Value *V, unsigned Reg);
 
-  /// AssignOrderingToNode - Assign an ordering to the node. The order is gotten
-  /// from how the code appeared in the source. The ordering is used by the
-  /// scheduler to effectively turn off scheduling.
-  void AssignOrderingToNode(const SDNode *Node);
-
   void visit(const Instruction &I);
 
   void visit(unsigned Opcode, const User &I);
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 7163932e19..7269bb260d 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -624,6 +624,7 @@ void SelectionDAGISel::CodeGenAndEmitDAG() {
 
     DEBUG(dbgs() << "Optimized type-legalized selection DAG: BB#" << BlockNumber
           << " '" << BlockName << "'\n"; CurDAG->dump());
+
   }
 
   {
@@ -790,9 +791,6 @@ void SelectionDAGISel::DoInstructionSelection() {
         continue;
       // Replace node.
       if (ResNode) {
-        // Propagate ordering
-        CurDAG->AssignOrdering(ResNode, CurDAG->GetOrdering(Node));
-
         ReplaceUses(Node, ResNode);
       }
 
diff --git a/lib/Target/NVPTX/NVPTXISelLowering.cpp b/lib/Target/NVPTX/NVPTXISelLowering.cpp
index 5caf08a278..9ebb888911 100644
--- a/lib/Target/NVPTX/NVPTXISelLowering.cpp
+++ b/lib/Target/NVPTX/NVPTXISelLowering.cpp
@@ -1145,14 +1145,14 @@ SDValue NVPTXTargetLowering::LowerFormalArguments(
             false,
             TD->getABITypeAlignment(ObjectVT.getTypeForEVT(F->getContext())));
         if (p.getNode())
-          DAG.AssignOrdering(p.getNode(), idx + 1);
+          p.getNode()->setIROrder(idx + 1);
         InVals.push_back(p);
       } else {
         // If no ABI, just move the param symbol
         SDValue Arg = getParamSymbol(DAG, idx, ObjectVT);
         SDValue p = DAG.getNode(NVPTXISD::MoveParam, dl, ObjectVT, Arg);
         if (p.getNode())
-          DAG.AssignOrdering(p.getNode(), idx + 1);
+          p.getNode()->setIROrder(idx + 1);
         InVals.push_back(p);
       }
       continue;
@@ -1169,7 +1169,7 @@ SDValue NVPTXTargetLowering::LowerFormalArguments(
       SDValue Arg = getParamSymbol(DAG, idx, getPointerTy());
       SDValue p = DAG.getNode(NVPTXISD::MoveParam, dl, ObjectVT, Arg);
       if (p.getNode())
-        DAG.AssignOrdering(p.getNode(), idx + 1);
+        p.getNode()->setIROrder(idx + 1);
       if (isKernel)
         InVals.push_back(p);
       else {
diff --git a/lib/Target/X86/X86ISelDAGToDAG.cpp b/lib/Target/X86/X86ISelDAGToDAG.cpp
index 0a29901497..a801c8af30 100644
--- a/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -2335,9 +2335,6 @@ SDNode *X86DAGToDAGISel::Select(SDNode *Node) {
       DEBUG(dbgs() << "=> "; ResHi.getNode()->dump(CurDAG); dbgs() << '\n');
     }
 
-    // Propagate ordering to the last node, for now.
-    CurDAG->AssignOrdering(InFlag.getNode(), CurDAG->GetOrdering(Node));
-
     return NULL;
   }