diff --git a/lib/CodeGen/SelectionDAG/CallingConvLower.cpp b/lib/CodeGen/SelectionDAG/CallingConvLower.cpp
index 5987e0c..a6f52dd 100644
--- a/lib/CodeGen/SelectionDAG/CallingConvLower.cpp
+++ b/lib/CodeGen/SelectionDAG/CallingConvLower.cpp
@@ -91,12 +91,11 @@
 
 /// AnalyzeCallOperands - Analyze an ISD::CALL node, incorporating info
 /// about the passed values into this state.
-void CCState::AnalyzeCallOperands(SDNode *TheCall, CCAssignFn Fn) {
-  unsigned NumOps = (TheCall->getNumOperands() - 5) / 2;
+void CCState::AnalyzeCallOperands(CallSDNode *TheCall, CCAssignFn Fn) {
+  unsigned NumOps = TheCall->getNumArgs();
   for (unsigned i = 0; i != NumOps; ++i) {
-    MVT ArgVT = TheCall->getOperand(5+2*i).getValueType();
-    ISD::ArgFlagsTy ArgFlags =
-      cast<ARG_FLAGSSDNode>(TheCall->getOperand(5+2*i+1))->getArgFlags();
+    MVT ArgVT = TheCall->getArg(i).getValueType();
+    ISD::ArgFlagsTy ArgFlags = TheCall->getArgFlags(i);
     if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
       cerr << "Call operand #" << i << " has unhandled type "
            << ArgVT.getMVTString() << "\n";
@@ -124,9 +123,9 @@
 
 /// AnalyzeCallResult - Analyze the return values of an ISD::CALL node,
 /// incorporating info about the passed values into this state.
-void CCState::AnalyzeCallResult(SDNode *TheCall, CCAssignFn Fn) {
-  for (unsigned i = 0, e = TheCall->getNumValues() - 1; i != e; ++i) {
-    MVT VT = TheCall->getValueType(i);
+void CCState::AnalyzeCallResult(CallSDNode *TheCall, CCAssignFn Fn) {
+  for (unsigned i = 0, e = TheCall->getNumRetVals(); i != e; ++i) {
+    MVT VT = TheCall->getRetValType(i);
     if (Fn(i, VT, VT, CCValAssign::Full, ISD::ArgFlagsTy(), *this)) {
       cerr << "Call result #" << i << " has unhandled type "
            << VT.getMVTString() << "\n";
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 6ebd514..921d7b0 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -595,13 +595,13 @@
 /// correspond to it.  This is useful when we're about to delete or repurpose
 /// the node.  We don't want future request for structurally identical nodes
 /// to return N anymore.
-void SelectionDAG::RemoveNodeFromCSEMaps(SDNode *N) {
+bool SelectionDAG::RemoveNodeFromCSEMaps(SDNode *N) {
   bool Erased = false;
   switch (N->getOpcode()) {
   case ISD::EntryToken:
     assert(0 && "EntryToken should not be in CSEMaps!");
-    return;
-  case ISD::HANDLENODE: return;  // noop.
+    return false;
+  case ISD::HANDLENODE: return false;  // noop.
   case ISD::CONDCODE:
     assert(CondCodeNodes[cast<CondCodeSDNode>(N)->get()] &&
            "Cond code doesn't exist!");
@@ -635,7 +635,8 @@
   // flag result (which cannot be CSE'd) or is one of the special cases that are
   // not subject to CSE.
   if (!Erased && N->getValueType(N->getNumValues()-1) != MVT::Flag &&
-      !N->isTargetOpcode() &&
+      !N->isMachineOpcode() &&
+      N->getOpcode() != ISD::CALL &&
       N->getOpcode() != ISD::DBG_LABEL &&
       N->getOpcode() != ISD::DBG_STOPPOINT &&
       N->getOpcode() != ISD::EH_LABEL &&
@@ -645,6 +646,7 @@
     assert(0 && "Node is not in map!");
   }
 #endif
+  return Erased;
 }
 
 /// AddNonLeafNodeToCSEMaps - Add the specified node back to the CSE maps.  It
@@ -660,6 +662,7 @@
 
   switch (N->getOpcode()) {
   default: break;
+  case ISD::CALL:
   case ISD::HANDLENODE:
   case ISD::DBG_LABEL:
   case ISD::DBG_STOPPOINT:
@@ -3304,6 +3307,21 @@
 }
 
 SDValue
+SelectionDAG::getCall(unsigned CallingConv, bool IsVarArgs, bool IsTailCall,
+                      SDVTList VTs,
+                      const SDValue *Operands, unsigned NumOperands) {
+  // Do not CSE calls. Note that in addition to being a compile-time
+  // optimization (since attempting CSE of calls is unlikely to be
+  // meaningful), we actually depend on this behavior. CallSDNode can
+  // be mutated, which is only safe if calls are not CSE'd.
+  SDNode *N = NodeAllocator.Allocate<CallSDNode>();
+  new (N) CallSDNode(CallingConv, IsVarArgs, IsTailCall,
+                     VTs, Operands, NumOperands);
+  AllNodes.push_back(N);
+  return SDValue(N, 0);
+}
+
+SDValue
 SelectionDAG::getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
                       MVT VT, SDValue Chain,
                       SDValue Ptr, SDValue Offset,
@@ -3761,7 +3779,8 @@
   
   // Nope it doesn't.  Remove the node from its current place in the maps.
   if (InsertPos)
-    RemoveNodeFromCSEMaps(N);
+    if (!RemoveNodeFromCSEMaps(N))
+      InsertPos = 0;
   
   // Now we update the operands.
   N->OperandList[0].getVal()->removeUser(0, N);
@@ -3790,7 +3809,8 @@
   
   // Nope it doesn't.  Remove the node from its current place in the maps.
   if (InsertPos)
-    RemoveNodeFromCSEMaps(N);
+    if (!RemoveNodeFromCSEMaps(N))
+      InsertPos = 0;
   
   // Now we update the operands.
   if (N->OperandList[0] != Op1) {
@@ -3856,7 +3876,8 @@
   
   // Nope it doesn't.  Remove the node from its current place in the maps.
   if (InsertPos)
-    RemoveNodeFromCSEMaps(N);
+    if (!RemoveNodeFromCSEMaps(N))
+      InsertPos = 0;
   
   // Now we update the operands.
   for (unsigned i = 0; i != NumOps; ++i) {
@@ -4079,7 +4100,8 @@
       return ON;
   }
 
-  RemoveNodeFromCSEMaps(N);
+  if (!RemoveNodeFromCSEMaps(N))
+    IP = 0;
 
   // Start the morphing.
   N->NodeType = Opc;
@@ -4582,6 +4604,7 @@
 void LoadSDNode::ANCHOR() {}
 void StoreSDNode::ANCHOR() {}
 void AtomicSDNode::ANCHOR() {}
+void CallSDNode::ANCHOR() {}
 
 HandleSDNode::~HandleSDNode() {
   DropOperands();
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
index a95a50b..599f0dd 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
@@ -5325,9 +5325,6 @@
                             ArgListTy &Args, SelectionDAG &DAG) {
   SmallVector<SDValue, 32> Ops;
   Ops.push_back(Chain);   // Op#0 - Chain
-  Ops.push_back(DAG.getConstant(CallingConv, getPointerTy())); // Op#1 - CC
-  Ops.push_back(DAG.getConstant(isVarArg, getPointerTy()));    // Op#2 - VarArg
-  Ops.push_back(DAG.getConstant(isTailCall, getPointerTy()));  // Op#3 - Tail
   Ops.push_back(Callee);
   
   // Handle all of the outgoing arguments.
@@ -5412,10 +5409,10 @@
   LoweredRetTys.push_back(MVT::Other);  // Always has a chain.
   
   // Create the CALL node.
-  SDValue Res = DAG.getNode(ISD::CALL,
-                              DAG.getVTList(&LoweredRetTys[0],
-                                            LoweredRetTys.size()),
-                              &Ops[0], Ops.size());
+  SDValue Res = DAG.getCall(CallingConv, isVarArg, isTailCall,
+                            DAG.getVTList(&LoweredRetTys[0],
+                                          LoweredRetTys.size()),
+                            &Ops[0], Ops.size());
   Chain = Res.getValue(LoweredRetTys.size() - 1);
 
   // Gather up the call result into a single value.
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 3159db4..fa17510 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -402,56 +402,45 @@
   for (SelectionDAG::allnodes_iterator BE = DAG.allnodes_begin(),
          BI = DAG.allnodes_end(); BI != BE; ) {
     --BI;
-    if (BI->getOpcode() == ISD::CALL) {
+    if (CallSDNode *TheCall = dyn_cast<CallSDNode>(BI)) {
       SDValue OpRet(Ret, 0);
       SDValue OpCall(BI, 0);
-      bool isMarkedTailCall = 
-        cast<ConstantSDNode>(OpCall.getOperand(3))->getZExtValue() != 0;
+      bool isMarkedTailCall = TheCall->isTailCall();
       // If CALL node has tail call attribute set to true and the call is not
       // eligible (no RET or the target rejects) the attribute is fixed to
       // false. The TargetLowering::IsEligibleForTailCallOptimization function
       // must correctly identify tail call optimizable calls.
       if (!isMarkedTailCall) continue;
       if (Ret==NULL ||
-          !TLI.IsEligibleForTailCallOptimization(OpCall, OpRet, DAG)) {
-        // Not eligible. Mark CALL node as non tail call.
-        SmallVector<SDValue, 32> Ops;
-        unsigned idx=0;
-        for(SDNode::op_iterator I =OpCall.getNode()->op_begin(),
-              E = OpCall.getNode()->op_end(); I != E; I++, idx++) {
-          if (idx!=3)
-            Ops.push_back(*I);
-          else
-            Ops.push_back(DAG.getConstant(false, TLI.getPointerTy()));
-        }
-        DAG.UpdateNodeOperands(OpCall, Ops.begin(), Ops.size());
+          !TLI.IsEligibleForTailCallOptimization(TheCall, OpRet, DAG)) {
+        // Not eligible. Mark CALL node as non tail call. Note that we
+        // can modify the call node in place since calls are not CSE'd.
+        TheCall->setNotTailCall();
       } else {
         // Look for tail call clobbered arguments. Emit a series of
         // copyto/copyfrom virtual register nodes to protect them.
         SmallVector<SDValue, 32> Ops;
-        SDValue Chain = OpCall.getOperand(0), InFlag;
-        unsigned idx=0;
-        for(SDNode::op_iterator I = OpCall.getNode()->op_begin(),
-              E = OpCall.getNode()->op_end(); I != E; I++, idx++) {
-          SDValue Arg = *I;
-          if (idx > 4 && (idx % 2)) {
-            bool isByVal = cast<ARG_FLAGSSDNode>(OpCall.getOperand(idx+1))->
-              getArgFlags().isByVal();
-            MachineFunction &MF = DAG.getMachineFunction();
-            MachineFrameInfo *MFI = MF.getFrameInfo();
-            if (!isByVal &&
-                IsPossiblyOverwrittenArgumentOfTailCall(Arg, MFI)) {
-              MVT VT = Arg.getValueType();
-              unsigned VReg = MF.getRegInfo().
-                createVirtualRegister(TLI.getRegClassFor(VT));
-              Chain = DAG.getCopyToReg(Chain, VReg, Arg, InFlag);
-              InFlag = Chain.getValue(1);
-              Arg = DAG.getCopyFromReg(Chain, VReg, VT, InFlag);
-              Chain = Arg.getValue(1);
-              InFlag = Arg.getValue(2);
-            }
+        SDValue Chain = TheCall->getChain(), InFlag;
+        Ops.push_back(Chain);
+        Ops.push_back(TheCall->getCallee());
+        for (unsigned i = 0, e = TheCall->getNumArgs(); i != e; ++i) {
+          SDValue Arg = TheCall->getArg(i);
+          bool isByVal = TheCall->getArgFlags(i).isByVal();
+          MachineFunction &MF = DAG.getMachineFunction();
+          MachineFrameInfo *MFI = MF.getFrameInfo();
+          if (!isByVal &&
+              IsPossiblyOverwrittenArgumentOfTailCall(Arg, MFI)) {
+            MVT VT = Arg.getValueType();
+            unsigned VReg = MF.getRegInfo().
+              createVirtualRegister(TLI.getRegClassFor(VT));
+            Chain = DAG.getCopyToReg(Chain, VReg, Arg, InFlag);
+            InFlag = Chain.getValue(1);
+            Arg = DAG.getCopyFromReg(Chain, VReg, VT, InFlag);
+            Chain = Arg.getValue(1);
+            InFlag = Arg.getValue(2);
           }
           Ops.push_back(Arg);
+          Ops.push_back(TheCall->getArgFlagsVal(i));
         }
         // Link in chain of CopyTo/CopyFromReg.
         Ops[0] = Chain;
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
index f2cd3c1..570caa9 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
@@ -179,6 +179,12 @@
       Op += ":" + utostr(D->getColumn());
   } else if (const LabelSDNode *L = dyn_cast<LabelSDNode>(Node)) {
     Op += ": LabelID=" + utostr(L->getLabelID());
+  } else if (const CallSDNode *C = dyn_cast<CallSDNode>(Node)) {
+    Op += ": CallingConv=" + utostr(C->getCallingConv());
+    if (C->isVarArg())
+      Op += ", isVarArg";
+    if (C->isTailCall())
+      Op += ", isTailCall";
   } else if (const ExternalSymbolSDNode *ES =
              dyn_cast<ExternalSymbolSDNode>(Node)) {
     Op += "'" + std::string(ES->getSymbol()) + "'";
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index cb0fa8e..2202177 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -410,13 +410,14 @@
 /// ARMISD:CALL <- callseq_end chain. Also add input and output parameter
 /// nodes.
 SDValue ARMTargetLowering::LowerCALL(SDValue Op, SelectionDAG &DAG) {
-  MVT RetVT= Op.getNode()->getValueType(0);
-  SDValue Chain    = Op.getOperand(0);
-  unsigned CallConv  = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
+  CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
+  MVT RetVT = TheCall->getRetValType(0);
+  SDValue Chain    = TheCall->getChain();
+  unsigned CallConv  = TheCall->getCallingConv();
   assert((CallConv == CallingConv::C ||
           CallConv == CallingConv::Fast) && "unknown calling convention");
-  SDValue Callee   = Op.getOperand(4);
-  unsigned NumOps    = (Op.getNumOperands() - 5) / 2;
+  SDValue Callee   = TheCall->getCallee();
+  unsigned NumOps    = TheCall->getNumArgs();
   unsigned ArgOffset = 0;   // Frame mechanisms handle retaddr slot
   unsigned NumGPRs = 0;     // GPRs used for parameter passing.
 
@@ -429,9 +430,8 @@
     unsigned ObjGPRs;
     unsigned StackPad;
     unsigned GPRPad;
-    MVT ObjectVT = Op.getOperand(5+2*i).getValueType();
-    ISD::ArgFlagsTy Flags =
-      cast<ARG_FLAGSSDNode>(Op.getOperand(5+2*i+1))->getArgFlags();
+    MVT ObjectVT = TheCall->getArg(i).getValueType();
+    ISD::ArgFlagsTy Flags = TheCall->getArgFlags(i);
     HowToPassArgument(ObjectVT, NumGPRs, NumBytes, ObjGPRs, ObjSize,
                       GPRPad, StackPad, Flags);
     NumBytes += ObjSize + StackPad;
@@ -453,9 +453,8 @@
   std::vector<std::pair<unsigned, SDValue> > RegsToPass;
   std::vector<SDValue> MemOpChains;
   for (unsigned i = 0; i != NumOps; ++i) {
-    SDValue Arg = Op.getOperand(5+2*i);
-    ISD::ArgFlagsTy Flags =
-      cast<ARG_FLAGSSDNode>(Op.getOperand(5+2*i+1))->getArgFlags();
+    SDValue Arg = TheCall->getArg(i);
+    ISD::ArgFlagsTy Flags = TheCall->getArgFlags(i);
     MVT ArgVT = Arg.getValueType();
 
     unsigned ObjSize;
@@ -631,7 +630,8 @@
   case MVT::i32:
     Chain = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag).getValue(1);
     ResultVals.push_back(Chain.getValue(0));
-    if (Op.getNode()->getValueType(1) == MVT::i32) {
+    if (TheCall->getNumRetVals() > 1 &&
+        TheCall->getRetValType(1) == MVT::i32) {
       // Returns a i64 value.
       Chain = DAG.getCopyFromReg(Chain, ARM::R1, MVT::i32,
                                  Chain.getValue(2)).getValue(1);
diff --git a/lib/Target/CellSPU/SPUISelLowering.cpp b/lib/Target/CellSPU/SPUISelLowering.cpp
index eec428b..384755d 100644
--- a/lib/Target/CellSPU/SPUISelLowering.cpp
+++ b/lib/Target/CellSPU/SPUISelLowering.cpp
@@ -1101,13 +1101,14 @@
 static
 SDValue
 LowerCALL(SDValue Op, SelectionDAG &DAG, const SPUSubtarget *ST) {
-  SDValue Chain = Op.getOperand(0);
+  CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
+  SDValue Chain = TheCall->getChain();
 #if 0
-  bool isVarArg   = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0;
-  bool isTailCall = cast<ConstantSDNode>(Op.getOperand(3))->getZExtValue() != 0;
+  bool isVarArg   = TheCall->isVarArg();
+  bool isTailCall = TheCall->isTailCall();
 #endif
-  SDValue Callee    = Op.getOperand(4);
-  unsigned NumOps     = (Op.getNumOperands() - 5) / 2;
+  SDValue Callee    = TheCall->getCallee();
+  unsigned NumOps     = TheCall->getNumArgs();
   unsigned StackSlotSize = SPUFrameInfo::stackSlotSize();
   const unsigned *ArgRegs = SPURegisterInfo::getArgRegs();
   const unsigned NumArgRegs = SPURegisterInfo::getNumArgRegs();
@@ -1136,7 +1137,7 @@
   SmallVector<SDValue, 8> MemOpChains;
 
   for (unsigned i = 0; i != NumOps; ++i) {
-    SDValue Arg = Op.getOperand(5+2*i);
+    SDValue Arg = TheCall->getArg(i);
 
     // PtrOff will be used to store the current argument to the stack if a
     // register cannot be found for it.
@@ -1256,18 +1257,18 @@
                              DAG.getConstant(NumStackBytes, PtrVT),
                              DAG.getConstant(0, PtrVT),
                              InFlag);
-  if (Op.getNode()->getValueType(0) != MVT::Other)
+  if (TheCall->getValueType(0) != MVT::Other)
     InFlag = Chain.getValue(1);
 
   SDValue ResultVals[3];
   unsigned NumResults = 0;
 
   // If the call has results, copy the values out of the ret val registers.
-  switch (Op.getNode()->getValueType(0).getSimpleVT()) {
+  switch (TheCall->getValueType(0).getSimpleVT()) {
   default: assert(0 && "Unexpected ret value!");
   case MVT::Other: break;
   case MVT::i32:
-    if (Op.getNode()->getValueType(1) == MVT::i32) {
+    if (TheCall->getValueType(1) == MVT::i32) {
       Chain = DAG.getCopyFromReg(Chain, SPU::R4, MVT::i32, InFlag).getValue(1);
       ResultVals[0] = Chain.getValue(0);
       Chain = DAG.getCopyFromReg(Chain, SPU::R3, MVT::i32,
@@ -1287,7 +1288,7 @@
     break;
   case MVT::f32:
   case MVT::f64:
-    Chain = DAG.getCopyFromReg(Chain, SPU::R3, Op.getNode()->getValueType(0),
+    Chain = DAG.getCopyFromReg(Chain, SPU::R3, TheCall->getValueType(0),
                                InFlag).getValue(1);
     ResultVals[0] = Chain.getValue(0);
     NumResults = 1;
@@ -1297,7 +1298,7 @@
   case MVT::v4i32:
   case MVT::v8i16:
   case MVT::v16i8:
-    Chain = DAG.getCopyFromReg(Chain, SPU::R3, Op.getNode()->getValueType(0),
+    Chain = DAG.getCopyFromReg(Chain, SPU::R3, TheCall->getValueType(0),
                                    InFlag).getValue(1);
     ResultVals[0] = Chain.getValue(0);
     NumResults = 1;
diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp
index 1f77b13..557a105 100644
--- a/lib/Target/Mips/MipsISelLowering.cpp
+++ b/lib/Target/Mips/MipsISelLowering.cpp
@@ -585,10 +585,11 @@
 {
   MachineFunction &MF = DAG.getMachineFunction();
 
-  SDValue Chain = Op.getOperand(0);
-  SDValue Callee = Op.getOperand(4);
-  bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0;
-  unsigned CC = DAG.getMachineFunction().getFunction()->getCallingConv();
+  CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
+  SDValue Chain = TheCall->getChain();
+  SDValue Callee = TheCall->getCallee();
+  bool isVarArg = TheCall->isVarArg();
+  unsigned CC = TheCall->getCallingConv();
 
   MachineFrameInfo *MFI = MF.getFrameInfo();
 
@@ -603,7 +604,7 @@
     MFI->CreateFixedObject(VTsize, (VTsize*3));
   }
 
-  CCInfo.AnalyzeCallOperands(Op.getNode(), CC_Mips);
+  CCInfo.AnalyzeCallOperands(TheCall, CC_Mips);
   
   // Get a count of how many bytes are to be pushed on the stack.
   unsigned NumBytes = CCInfo.getNextStackOffset();
@@ -624,7 +625,7 @@
     CCValAssign &VA = ArgLocs[i];
 
     // Arguments start after the 5 first operands of ISD::CALL
-    SDValue Arg = Op.getOperand(5+2*VA.getValNo());
+    SDValue Arg = TheCall->getArg(i);
     
     // Promote the value if needed.
     switch (VA.getLocInfo()) {
@@ -751,7 +752,7 @@
 
   // Handle result values, copying them out of physregs into vregs that we
   // return.
-  return SDValue(LowerCallResult(Chain, InFlag, Op.getNode(), CC, DAG), Op.getResNo());
+  return SDValue(LowerCallResult(Chain, InFlag, TheCall, CC, DAG), Op.getResNo());
 }
 
 /// LowerCallResult - Lower the result values of an ISD::CALL into the
@@ -760,11 +761,10 @@
 /// being lowered. Returns a SDNode with the same number of values as the 
 /// ISD::CALL.
 SDNode *MipsTargetLowering::
-LowerCallResult(SDValue Chain, SDValue InFlag, SDNode *TheCall, 
+LowerCallResult(SDValue Chain, SDValue InFlag, CallSDNode *TheCall, 
         unsigned CallingConv, SelectionDAG &DAG) {
   
-  bool isVarArg =
-    cast<ConstantSDNode>(TheCall->getOperand(2))->getZExtValue() != 0;
+  bool isVarArg = TheCall->isVarArg();
 
   // Assign locations to each value returned by this call.
   SmallVector<CCValAssign, 16> RVLocs;
diff --git a/lib/Target/Mips/MipsISelLowering.h b/lib/Target/Mips/MipsISelLowering.h
index 9d8a756..fd595c9 100644
--- a/lib/Target/Mips/MipsISelLowering.h
+++ b/lib/Target/Mips/MipsISelLowering.h
@@ -86,7 +86,7 @@
     const MipsSubtarget *Subtarget;
 
     // Lower Operand helpers
-    SDNode *LowerCallResult(SDValue Chain, SDValue InFlag, SDNode*TheCall,
+    SDNode *LowerCallResult(SDValue Chain, SDValue InFlag, CallSDNode *TheCall,
                             unsigned CallingConv, SelectionDAG &DAG);
     bool IsGlobalInSmallSection(GlobalValue *GV); 
     bool IsInSmallSection(unsigned Size); 
diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index edac162..1a891d9 100644
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -1328,10 +1328,9 @@
 
 /// CalculateStackSlotSize - Calculates the size reserved for this argument on
 /// the stack.
-static unsigned CalculateStackSlotSize(SDValue Arg, SDValue Flag,
+static unsigned CalculateStackSlotSize(SDValue Arg, ISD::ArgFlagsTy Flags,
                                        bool isVarArg, unsigned PtrByteSize) {
   MVT ArgVT = Arg.getValueType();
-  ISD::ArgFlagsTy Flags = cast<ARG_FLAGSSDNode>(Flag)->getArgFlags();
   unsigned ArgSize =ArgVT.getSizeInBits()/8;
   if (Flags.isByVal())
     ArgSize = Flags.getByValSize();
@@ -1475,14 +1474,14 @@
       if (isVarArg || isPPC64) {
         MinReservedArea = ((MinReservedArea+15)/16)*16;
         MinReservedArea += CalculateStackSlotSize(Op.getValue(ArgNo),
-                                                  Op.getOperand(ArgNo+3),
+                                                  Flags,
                                                   isVarArg,
                                                   PtrByteSize);
       } else  nAltivecParamsAtEnd++;
     } else
       // Calculate min reserved area.
       MinReservedArea += CalculateStackSlotSize(Op.getValue(ArgNo),
-                                                Op.getOperand(ArgNo+3),
+                                                Flags,
                                                 isVarArg,
                                                 PtrByteSize);
 
@@ -1794,13 +1793,13 @@
                                      bool isMachoABI,
                                      bool isVarArg,
                                      unsigned CC,
-                                     SDValue Call,
+                                     CallSDNode *TheCall,
                                      unsigned &nAltivecParamsAtEnd) {
   // Count how many bytes are to be pushed on the stack, including the linkage
   // area, and parameter passing area.  We start with 24/48 bytes, which is
   // prereserved space for [SP][CR][LR][3 x unused].
   unsigned NumBytes = PPCFrameInfo::getLinkageSize(isPPC64, isMachoABI);
-  unsigned NumOps = (Call.getNumOperands() - 5) / 2;
+  unsigned NumOps = TheCall->getNumArgs();
   unsigned PtrByteSize = isPPC64 ? 8 : 4;
 
   // Add up all the space actually used.
@@ -1811,8 +1810,8 @@
   // 16-byte aligned.
   nAltivecParamsAtEnd = 0;
   for (unsigned i = 0; i != NumOps; ++i) {
-    SDValue Arg = Call.getOperand(5+2*i);
-    SDValue Flag = Call.getOperand(5+2*i+1);
+    SDValue Arg = TheCall->getArg(i);
+    ISD::ArgFlagsTy Flags = TheCall->getArgFlags(i);
     MVT ArgVT = Arg.getValueType();
     // Varargs Altivec parameters are padded to a 16 byte boundary.
     if (ArgVT==MVT::v4f32 || ArgVT==MVT::v4i32 ||
@@ -1826,7 +1825,7 @@
       // Varargs and 64-bit Altivec parameters are padded to 16 byte boundary.
       NumBytes = ((NumBytes+15)/16)*16;
     }
-    NumBytes += CalculateStackSlotSize(Arg, Flag, isVarArg, PtrByteSize);
+    NumBytes += CalculateStackSlotSize(Arg, Flags, isVarArg, PtrByteSize);
   }
 
    // Allow for Altivec parameters at the end, if needed.
@@ -1876,27 +1875,25 @@
 /// calling conventions match, currently only fastcc supports tail calls, and
 /// the function CALL is immediatly followed by a RET.
 bool
-PPCTargetLowering::IsEligibleForTailCallOptimization(SDValue Call,
+PPCTargetLowering::IsEligibleForTailCallOptimization(CallSDNode *TheCall,
                                                      SDValue Ret,
                                                      SelectionDAG& DAG) const {
   // Variable argument functions are not supported.
-  if (!PerformTailCallOpt ||
-      cast<ConstantSDNode>(Call.getOperand(2))->getZExtValue() != 0)
+  if (!PerformTailCallOpt || TheCall->isVarArg())
     return false;
 
-  if (CheckTailCallReturnConstraints(Call, Ret)) {
+  if (CheckTailCallReturnConstraints(TheCall, Ret)) {
     MachineFunction &MF = DAG.getMachineFunction();
     unsigned CallerCC = MF.getFunction()->getCallingConv();
-    unsigned CalleeCC= cast<ConstantSDNode>(Call.getOperand(1))->getZExtValue();
+    unsigned CalleeCC = TheCall->getCallingConv();
     if (CalleeCC == CallingConv::Fast && CallerCC == CalleeCC) {
       // Functions containing by val parameters are not supported.
-      for (unsigned i = 0; i != ((Call.getNumOperands()-5)/2); i++) {
-         ISD::ArgFlagsTy Flags = cast<ARG_FLAGSSDNode>(Call.getOperand(5+2*i+1))
-           ->getArgFlags();
+      for (unsigned i = 0; i != TheCall->getNumArgs(); i++) {
+         ISD::ArgFlagsTy Flags = TheCall->getArgFlags(i);
          if (Flags.isByVal()) return false;
       }
 
-      SDValue Callee = Call.getOperand(4);
+      SDValue Callee = TheCall->getCallee();
       // Non PIC/GOT  tail calls are supported.
       if (getTargetMachine().getRelocationModel() != Reloc::PIC_)
         return true;
@@ -2070,13 +2067,14 @@
 SDValue PPCTargetLowering::LowerCALL(SDValue Op, SelectionDAG &DAG,
                                        const PPCSubtarget &Subtarget,
                                        TargetMachine &TM) {
-  SDValue Chain  = Op.getOperand(0);
-  bool isVarArg   = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0;
-  unsigned CC     = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
-  bool isTailCall = cast<ConstantSDNode>(Op.getOperand(3))->getZExtValue() != 0
+  CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
+  SDValue Chain  = TheCall->getChain();
+  bool isVarArg   = TheCall->isVarArg();
+  unsigned CC     = TheCall->getCallingConv();
+  bool isTailCall = TheCall->isTailCall()
                  && CC == CallingConv::Fast && PerformTailCallOpt;
-  SDValue Callee = Op.getOperand(4);
-  unsigned NumOps  = (Op.getNumOperands() - 5) / 2;
+  SDValue Callee = TheCall->getCallee();
+  unsigned NumOps  = TheCall->getNumArgs();
   
   bool isMachoABI = Subtarget.isMachoABI();
   bool isELF32_ABI  = Subtarget.isELF32_ABI();
@@ -2106,7 +2104,7 @@
   // prereserved space for [SP][CR][LR][3 x unused].
   unsigned NumBytes =
     CalculateParameterAndLinkageAreaSize(DAG, isPPC64, isMachoABI, isVarArg, CC,
-                                         Op, nAltivecParamsAtEnd);
+                                         TheCall, nAltivecParamsAtEnd);
 
   // Calculate by how many bytes the stack has to be adjusted in case of tail
   // call optimization.
@@ -2165,9 +2163,8 @@
   SmallVector<SDValue, 8> MemOpChains;
   for (unsigned i = 0; i != NumOps; ++i) {
     bool inMem = false;
-    SDValue Arg = Op.getOperand(5+2*i);
-    ISD::ArgFlagsTy Flags =
-      cast<ARG_FLAGSSDNode>(Op.getOperand(5+2*i+1))->getArgFlags();
+    SDValue Arg = TheCall->getArg(i);
+    ISD::ArgFlagsTy Flags = TheCall->getArgFlags(i);
     // See if next argument requires stack alignment in ELF
     bool Align = Flags.isSplit();
 
@@ -2391,7 +2388,7 @@
     ArgOffset = ((ArgOffset+15)/16)*16;
     ArgOffset += 12*16;
     for (unsigned i = 0; i != NumOps; ++i) {
-      SDValue Arg = Op.getOperand(5+2*i);
+      SDValue Arg = TheCall->getArg(i);
       MVT ArgType = Arg.getValueType();
       if (ArgType==MVT::v4f32 || ArgType==MVT::v4i32 ||
           ArgType==MVT::v8i16 || ArgType==MVT::v16i8) {
@@ -2530,7 +2527,7 @@
     assert(InFlag.getNode() &&
            "Flag must be set. Depend on flag being set in LowerRET");
     Chain = DAG.getNode(PPCISD::TAILCALL,
-                        Op.getNode()->getVTList(), &Ops[0], Ops.size());
+                        TheCall->getVTList(), &Ops[0], Ops.size());
     return SDValue(Chain.getNode(), Op.getResNo());
   }
 
@@ -2541,14 +2538,14 @@
                              DAG.getConstant(NumBytes, PtrVT),
                              DAG.getConstant(BytesCalleePops, PtrVT),
                              InFlag);
-  if (Op.getNode()->getValueType(0) != MVT::Other)
+  if (TheCall->getValueType(0) != MVT::Other)
     InFlag = Chain.getValue(1);
 
   SmallVector<SDValue, 16> ResultVals;
   SmallVector<CCValAssign, 16> RVLocs;
   unsigned CallerCC = DAG.getMachineFunction().getFunction()->getCallingConv();
   CCState CCInfo(CallerCC, isVarArg, TM, RVLocs);
-  CCInfo.AnalyzeCallResult(Op.getNode(), RetCC_PPC);
+  CCInfo.AnalyzeCallResult(TheCall, RetCC_PPC);
   
   // Copy all of the result registers out of their specified physreg.
   for (unsigned i = 0, e = RVLocs.size(); i != e; ++i) {
@@ -2566,7 +2563,7 @@
   
   // Otherwise, merge everything together with a MERGE_VALUES node.
   ResultVals.push_back(Chain);
-  SDValue Res = DAG.getMergeValues(Op.getNode()->getVTList(), &ResultVals[0],
+  SDValue Res = DAG.getMergeValues(TheCall->getVTList(), &ResultVals[0],
                                      ResultVals.size());
   return Res.getValue(Op.getResNo());
 }
diff --git a/lib/Target/PowerPC/PPCISelLowering.h b/lib/Target/PowerPC/PPCISelLowering.h
index ff969d2..72e00f6 100644
--- a/lib/Target/PowerPC/PPCISelLowering.h
+++ b/lib/Target/PowerPC/PPCISelLowering.h
@@ -322,7 +322,7 @@
      /// IsEligibleForTailCallOptimization - Check whether the call is eligible
     /// for tail call optimization. Target which want to do tail call
     /// optimization should implement this function.
-    virtual bool IsEligibleForTailCallOptimization(SDValue Call,
+    virtual bool IsEligibleForTailCallOptimization(CallSDNode *TheCall,
                                                    SDValue Ret,
                                                    SelectionDAG &DAG) const;
 
diff --git a/lib/Target/Sparc/SparcISelLowering.cpp b/lib/Target/Sparc/SparcISelLowering.cpp
index 07b108d..d89b6d4 100644
--- a/lib/Target/Sparc/SparcISelLowering.cpp
+++ b/lib/Target/Sparc/SparcISelLowering.cpp
@@ -224,10 +224,11 @@
 }
 
 static SDValue LowerCALL(SDValue Op, SelectionDAG &DAG) {
-  unsigned CallingConv = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
-  SDValue Chain = Op.getOperand(0);
-  SDValue Callee = Op.getOperand(4);
-  bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0;
+  CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
+  unsigned CallingConv = TheCall->getCallingConv();
+  SDValue Chain = TheCall->getChain();
+  SDValue Callee = TheCall->getCallee();
+  bool isVarArg = TheCall->isVarArg();
 
 #if 0
   // Analyze operands of the call, assigning locations to each operand.
@@ -243,8 +244,8 @@
   
   // Count the size of the outgoing arguments.
   unsigned ArgsSize = 0;
-  for (unsigned i = 5, e = Op.getNumOperands(); i != e; i += 2) {
-    switch (Op.getOperand(i).getValueType().getSimpleVT()) {
+  for (unsigned i = 0, e = TheCall->getNumArgs(); i != e; ++i) {
+    switch (TheCall->getArg(i).getValueType().getSimpleVT()) {
       default: assert(0 && "Unknown value type!");
       case MVT::i1:
       case MVT::i8:
@@ -279,7 +280,7 @@
     CCValAssign &VA = ArgLocs[i];
     
     // Arguments start after the 5 first operands of ISD::CALL
-    SDValue Arg = Op.getOperand(5+2*VA.getValNo());
+    SDValue Arg = TheCall->getArg(i);
 
     // Promote the value if needed.
     switch (VA.getLocInfo()) {
@@ -319,8 +320,8 @@
   };
   unsigned ArgOffset = 68;
 
-  for (unsigned i = 5, e = Op.getNumOperands(); i != e; i += 2) {
-    SDValue Val = Op.getOperand(i);
+  for (unsigned i = 0, e = TheCall->getNumArgs(); i != e; ++i) {
+    SDValue Val = TheCall->getArg(i);
     MVT ObjectVT = Val.getValueType();
     SDValue ValToStore(0, 0);
     unsigned ObjSize;
@@ -428,7 +429,7 @@
   SmallVector<CCValAssign, 16> RVLocs;
   CCState RVInfo(CallingConv, isVarArg, DAG.getTarget(), RVLocs);
   
-  RVInfo.AnalyzeCallResult(Op.getNode(), RetCC_Sparc32);
+  RVInfo.AnalyzeCallResult(TheCall, RetCC_Sparc32);
   SmallVector<SDValue, 8> ResultVals;
   
   // Copy all of the result registers out of their specified physreg.
@@ -448,7 +449,7 @@
   ResultVals.push_back(Chain);
 
   // Merge everything together with a MERGE_VALUES node.
-  return DAG.getMergeValues(Op.getNode()->getVTList(), &ResultVals[0],
+  return DAG.getMergeValues(TheCall->getVTList(), &ResultVals[0],
                             ResultVals.size());
 }
 
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index d8fbb51..4a9fd51 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -977,13 +977,12 @@
 /// being lowered.  The returns a SDNode with the same number of values as the
 /// ISD::CALL.
 SDNode *X86TargetLowering::
-LowerCallResult(SDValue Chain, SDValue InFlag, SDNode *TheCall, 
+LowerCallResult(SDValue Chain, SDValue InFlag, CallSDNode *TheCall, 
                 unsigned CallingConv, SelectionDAG &DAG) {
   
   // Assign locations to each value returned by this call.
   SmallVector<CCValAssign, 16> RVLocs;
-  bool isVarArg =
-    cast<ConstantSDNode>(TheCall->getOperand(2))->getZExtValue() != 0;
+  bool isVarArg = TheCall->isVarArg();
   CCState CCInfo(CallingConv, isVarArg, getTargetMachine(), RVLocs);
   CCInfo.AnalyzeCallResult(TheCall, RetCC_X86);
 
@@ -1048,12 +1047,12 @@
 
 /// CallIsStructReturn - Determines whether a CALL node uses struct return
 /// semantics.
-static bool CallIsStructReturn(SDValue Op) {
-  unsigned NumOps = (Op.getNumOperands() - 5) / 2;
+static bool CallIsStructReturn(CallSDNode *TheCall) {
+  unsigned NumOps = TheCall->getNumArgs();
   if (!NumOps)
     return false;
 
-  return cast<ARG_FLAGSSDNode>(Op.getOperand(6))->getArgFlags().isSRet();
+  return TheCall->getArgFlags(0).isSRet();
 }
 
 /// ArgsAreStructReturn - Determines whether a FORMAL_ARGUMENTS node uses struct
@@ -1069,12 +1068,11 @@
 /// IsCalleePop - Determines whether a CALL or FORMAL_ARGUMENTS node requires
 /// the callee to pop its own arguments. Callee pop is necessary to support tail
 /// calls.
-bool X86TargetLowering::IsCalleePop(SDValue Op) {
-  bool IsVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0;
+bool X86TargetLowering::IsCalleePop(bool IsVarArg, unsigned CallingConv) {
   if (IsVarArg)
     return false;
 
-  switch (cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue()) {
+  switch (CallingConv) {
   default:
     return false;
   case CallingConv::X86_StdCall:
@@ -1086,11 +1084,9 @@
   }
 }
 
-/// CCAssignFnForNode - Selects the correct CCAssignFn for a CALL or
-/// FORMAL_ARGUMENTS node.
-CCAssignFn *X86TargetLowering::CCAssignFnForNode(SDValue Op) const {
-  unsigned CC = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
-  
+/// CCAssignFnForNode - Selects the correct CCAssignFn for a the
+/// given CallingConvention value.
+CCAssignFn *X86TargetLowering::CCAssignFnForNode(unsigned CC) const {
   if (Subtarget->is64Bit()) {
     if (Subtarget->isTargetWin64())
       return CC_X86_Win64_C;
@@ -1203,7 +1199,7 @@
   // Assign locations to all of the incoming arguments.
   SmallVector<CCValAssign, 16> ArgLocs;
   CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs);
-  CCInfo.AnalyzeFormalArguments(Op.getNode(), CCAssignFnForNode(Op));
+  CCInfo.AnalyzeFormalArguments(Op.getNode(), CCAssignFnForNode(CC));
   
   SmallVector<SDValue, 8> ArgValues;
   unsigned LastVal = ~0U;
@@ -1388,7 +1384,7 @@
   ArgValues.push_back(Root);
 
   // Some CCs need callee pop.
-  if (IsCalleePop(Op)) {
+  if (IsCalleePop(isVarArg, CC)) {
     BytesToPopOnReturn  = StackSize; // Callee pops everything.
     BytesCallerReserves = 0;
   } else {
@@ -1413,16 +1409,14 @@
 }
 
 SDValue
-X86TargetLowering::LowerMemOpCallTo(SDValue Op, SelectionDAG &DAG,
+X86TargetLowering::LowerMemOpCallTo(CallSDNode *TheCall, SelectionDAG &DAG,
                                     const SDValue &StackPtr,
                                     const CCValAssign &VA,
                                     SDValue Chain,
-                                    SDValue Arg) {
+                                    SDValue Arg, ISD::ArgFlagsTy Flags) {
   unsigned LocMemOffset = VA.getLocMemOffset();
   SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset);
   PtrOff = DAG.getNode(ISD::ADD, getPointerTy(), StackPtr, PtrOff);
-  ISD::ArgFlagsTy Flags =
-    cast<ARG_FLAGSSDNode>(Op.getOperand(6+2*VA.getValNo()))->getArgFlags();
   if (Flags.isByVal()) {
     return CreateCopyOfByValArgument(Arg, PtrOff, Chain, Flags, DAG);
   }
@@ -1470,14 +1464,15 @@
 
 SDValue X86TargetLowering::LowerCALL(SDValue Op, SelectionDAG &DAG) {
   MachineFunction &MF = DAG.getMachineFunction();
-  SDValue Chain       = Op.getOperand(0);
-  unsigned CC         = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
-  bool isVarArg   = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0;
-  bool IsTailCall = cast<ConstantSDNode>(Op.getOperand(3))->getZExtValue() != 0
-                        && CC == CallingConv::Fast && PerformTailCallOpt;
-  SDValue Callee      = Op.getOperand(4);
+  CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
+  SDValue Chain       = TheCall->getChain();
+  unsigned CC         = TheCall->getCallingConv();
+  bool isVarArg       = TheCall->isVarArg();
+  bool IsTailCall     = TheCall->isTailCall() &&
+                        CC == CallingConv::Fast && PerformTailCallOpt;
+  SDValue Callee      = TheCall->getCallee();
   bool Is64Bit        = Subtarget->is64Bit();
-  bool IsStructRet    = CallIsStructReturn(Op);
+  bool IsStructRet    = CallIsStructReturn(TheCall);
 
   assert(!(isVarArg && CC == CallingConv::Fast) &&
          "Var args not supported with calling convention fastcc");
@@ -1485,7 +1480,7 @@
   // Analyze operands of the call, assigning locations to each operand.
   SmallVector<CCValAssign, 16> ArgLocs;
   CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs);
-  CCInfo.AnalyzeCallOperands(Op.getNode(), CCAssignFnForNode(Op));
+  CCInfo.AnalyzeCallOperands(TheCall, CCAssignFnForNode(CC));
   
   // Get a count of how many bytes are to be pushed on the stack.
   unsigned NumBytes = CCInfo.getNextStackOffset();
@@ -1520,9 +1515,9 @@
   // of tail call optimization arguments are handle later.
   for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
     CCValAssign &VA = ArgLocs[i];
-    SDValue Arg = Op.getOperand(5+2*VA.getValNo());
-    bool isByVal = cast<ARG_FLAGSSDNode>(Op.getOperand(6+2*VA.getValNo()))->
-      getArgFlags().isByVal();
+    SDValue Arg = TheCall->getArg(i);
+    ISD::ArgFlagsTy Flags = TheCall->getArgFlags(i);
+    bool isByVal = Flags.isByVal();
   
     // Promote the value if needed.
     switch (VA.getLocInfo()) {
@@ -1571,8 +1566,8 @@
         if (StackPtr.getNode() == 0)
           StackPtr = DAG.getCopyFromReg(Chain, X86StackPtr, getPointerTy());
         
-        MemOpChains.push_back(LowerMemOpCallTo(Op, DAG, StackPtr, VA, Chain,
-                                               Arg));
+        MemOpChains.push_back(LowerMemOpCallTo(TheCall, DAG, StackPtr, VA,
+                                               Chain, Arg, Flags));
       }
     }
   }
@@ -1651,10 +1646,8 @@
       CCValAssign &VA = ArgLocs[i];
       if (!VA.isRegLoc()) {
         assert(VA.isMemLoc());
-        SDValue Arg = Op.getOperand(5+2*VA.getValNo());
-        SDValue FlagsOp = Op.getOperand(6+2*VA.getValNo());
-        ISD::ArgFlagsTy Flags =
-          cast<ARG_FLAGSSDNode>(FlagsOp)->getArgFlags();
+        SDValue Arg = TheCall->getArg(i);
+        ISD::ArgFlagsTy Flags = TheCall->getArgFlags(i);
         // Create frame index.
         int32_t Offset = VA.getLocMemOffset()+FPDiff;
         uint32_t OpSize = (VA.getLocVT().getSizeInBits()+7)/8;
@@ -1764,7 +1757,7 @@
     assert(InFlag.getNode() && 
            "Flag must be set. Depend on flag being set in LowerRET");
     Chain = DAG.getNode(X86ISD::TAILCALL,
-                        Op.getNode()->getVTList(), &Ops[0], Ops.size());
+                        TheCall->getVTList(), &Ops[0], Ops.size());
       
     return SDValue(Chain.getNode(), Op.getResNo());
   }
@@ -1774,7 +1767,7 @@
 
   // Create the CALLSEQ_END node.
   unsigned NumBytesForCalleeToPush;
-  if (IsCalleePop(Op))
+  if (IsCalleePop(isVarArg, CC))
     NumBytesForCalleeToPush = NumBytes;    // Callee pops everything
   else if (!Is64Bit && CC != CallingConv::Fast && IsStructRet)
     // If this is is a call to a struct-return function, the callee
@@ -1793,7 +1786,7 @@
 
   // Handle result values, copying them out of physregs into vregs that we
   // return.
-  return SDValue(LowerCallResult(Chain, InFlag, Op.getNode(), CC, DAG),
+  return SDValue(LowerCallResult(Chain, InFlag, TheCall, CC, DAG),
                  Op.getResNo());
 }
 
@@ -1855,18 +1848,18 @@
 /// following the call is a return. A function is eligible if caller/callee
 /// calling conventions match, currently only fastcc supports tail calls, and
 /// the function CALL is immediatly followed by a RET.
-bool X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Call,
+bool X86TargetLowering::IsEligibleForTailCallOptimization(CallSDNode *TheCall,
                                                       SDValue Ret,
                                                       SelectionDAG& DAG) const {
   if (!PerformTailCallOpt)
     return false;
 
-  if (CheckTailCallReturnConstraints(Call, Ret)) {
+  if (CheckTailCallReturnConstraints(TheCall, Ret)) {
     MachineFunction &MF = DAG.getMachineFunction();
     unsigned CallerCC = MF.getFunction()->getCallingConv();
-    unsigned CalleeCC= cast<ConstantSDNode>(Call.getOperand(1))->getZExtValue();
+    unsigned CalleeCC= TheCall->getCallingConv();
     if (CalleeCC == CallingConv::Fast && CallerCC == CalleeCC) {
-      SDValue Callee = Call.getOperand(4);
+      SDValue Callee = TheCall->getCallee();
       // On x86/32Bit PIC/GOT  tail calls are supported.
       if (getTargetMachine().getRelocationModel() != Reloc::PIC_ ||
           !Subtarget->isPICStyleGOT()|| !Subtarget->is64Bit())
diff --git a/lib/Target/X86/X86ISelLowering.h b/lib/Target/X86/X86ISelLowering.h
index e5fc8ed..2212767 100644
--- a/lib/Target/X86/X86ISelLowering.h
+++ b/lib/Target/X86/X86ISelLowering.h
@@ -453,7 +453,7 @@
     /// IsEligibleForTailCallOptimization - Check whether the call is eligible
     /// for tail call optimization. Target which want to do tail call
     /// optimization should implement this function.
-    virtual bool IsEligibleForTailCallOptimization(SDValue Call, 
+    virtual bool IsEligibleForTailCallOptimization(CallSDNode *TheCall, 
                                                    SDValue Ret, 
                                                    SelectionDAG &DAG) const;
 
@@ -493,27 +493,27 @@
     bool X86ScalarSSEf32;
     bool X86ScalarSSEf64;
 
-    SDNode *LowerCallResult(SDValue Chain, SDValue InFlag, SDNode*TheCall,
+    SDNode *LowerCallResult(SDValue Chain, SDValue InFlag, CallSDNode *TheCall,
                             unsigned CallingConv, SelectionDAG &DAG);
 
     SDValue LowerMemArgument(SDValue Op, SelectionDAG &DAG,
                                const CCValAssign &VA,  MachineFrameInfo *MFI,
                                unsigned CC, SDValue Root, unsigned i);
 
-    SDValue LowerMemOpCallTo(SDValue Op, SelectionDAG &DAG,
+    SDValue LowerMemOpCallTo(CallSDNode *TheCall, SelectionDAG &DAG,
                                const SDValue &StackPtr,
                                const CCValAssign &VA, SDValue Chain,
-                               SDValue Arg);
+                               SDValue Arg, ISD::ArgFlagsTy Flags);
 
     // Call lowering helpers.
-    bool IsCalleePop(SDValue Op);
+    bool IsCalleePop(bool isVarArg, unsigned CallingConv);
     bool CallRequiresGOTPtrInReg(bool Is64Bit, bool IsTailCall);
     bool CallRequiresFnAddressInReg(bool Is64Bit, bool IsTailCall);
     SDValue EmitTailCallLoadRetAddr(SelectionDAG &DAG, SDValue &OutRetAddr,
                                 SDValue Chain, bool IsTailCall, bool Is64Bit,
                                 int FPDiff);
 
-    CCAssignFn *CCAssignFnForNode(SDValue Op) const;
+    CCAssignFn *CCAssignFnForNode(unsigned CallingConv) const;
     NameDecorationStyle NameDecorationForFORMAL_ARGUMENTS(SDValue Op);
     unsigned GetAlignedArgumentStackSize(unsigned StackSize, SelectionDAG &DAG);