lib/Target/R600/SIISelLowering.cpp - platform/external/llvm - Git at Google

 //===-- SIISelLowering.cpp - SI DAG Lowering Implementation ---------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 /// \file
 /// \brief Custom DAG lowering for SI
 //
 //===----------------------------------------------------------------------===//

 #include "SIISelLowering.h"
 #include "AMDIL.h"
 #include "AMDGPU.h"
 #include "AMDILIntrinsicInfo.h"
 #include "SIInstrInfo.h"
 #include "SIMachineFunctionInfo.h"
 #include "SIRegisterInfo.h"
 #include "llvm/IR/Function.h"
 #include "llvm/CodeGen/CallingConvLower.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/SelectionDAG.h"

 using namespace llvm;

 SITargetLowering::SITargetLowering(TargetMachine &TM) :
     AMDGPUTargetLowering(TM),
     TII(static_cast<const SIInstrInfo*>(TM.getInstrInfo())),
     TRI(TM.getRegisterInfo()) {

   addRegisterClass(MVT::i1, &AMDGPU::SReg_64RegClass);
   addRegisterClass(MVT::i64, &AMDGPU::SReg_64RegClass);

   addRegisterClass(MVT::v16i8, &AMDGPU::SReg_128RegClass);
   addRegisterClass(MVT::v32i8, &AMDGPU::SReg_256RegClass);
   addRegisterClass(MVT::v64i8, &AMDGPU::SReg_512RegClass);

   addRegisterClass(MVT::i32, &AMDGPU::VReg_32RegClass);
   addRegisterClass(MVT::f32, &AMDGPU::VReg_32RegClass);

   addRegisterClass(MVT::v1i32, &AMDGPU::VReg_32RegClass);

   addRegisterClass(MVT::v2i32, &AMDGPU::VReg_64RegClass);
   addRegisterClass(MVT::v2f32, &AMDGPU::VReg_64RegClass);

   addRegisterClass(MVT::v4i32, &AMDGPU::VReg_128RegClass);
   addRegisterClass(MVT::v4f32, &AMDGPU::VReg_128RegClass);

   addRegisterClass(MVT::v8i32, &AMDGPU::VReg_256RegClass);
   addRegisterClass(MVT::v8f32, &AMDGPU::VReg_256RegClass);

   addRegisterClass(MVT::v16i32, &AMDGPU::VReg_512RegClass);
   addRegisterClass(MVT::v16f32, &AMDGPU::VReg_512RegClass);

   computeRegisterProperties();

   setOperationAction(ISD::ADD, MVT::i64, Legal);
   setOperationAction(ISD::ADD, MVT::i32, Legal);

   setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
   setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);

   setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
   setTargetDAGCombine(ISD::SELECT_CC);

   setTargetDAGCombine(ISD::SETCC);

   setSchedulingPreference(Sched::Source);
 }

 SDValue SITargetLowering::LowerFormalArguments(
                                       SDValue Chain,
                                       CallingConv::ID CallConv,
                                       bool isVarArg,
                                       const SmallVectorImpl<ISD::InputArg> &Ins,
                                       DebugLoc DL, SelectionDAG &DAG,
                                       SmallVectorImpl<SDValue> &InVals) const {

   const TargetRegisterInfo *TRI = getTargetMachine().getRegisterInfo();

   MachineFunction &MF = DAG.getMachineFunction();
   FunctionType *FType = MF.getFunction()->getFunctionType();
   SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();

   assert(CallConv == CallingConv::C);

   SmallVector<ISD::InputArg, 16> Splits;
   uint32_t Skipped = 0;

   for (unsigned i = 0, e = Ins.size(), PSInputNum = 0; i != e; ++i) {
     const ISD::InputArg &Arg = Ins[i];

     // First check if it's a PS input addr
     if (Info->ShaderType == ShaderType::PIXEL && !Arg.Flags.isInReg()) {

       assert((PSInputNum <= 15) && "Too many PS inputs!");

       if (!Arg.Used) {
         // We can savely skip PS inputs
         Skipped |= 1 << i;
         ++PSInputNum;
         continue;
       }

       Info->PSInputAddr |= 1 << PSInputNum++;
     }

     // Second split vertices into their elements
     if (Arg.VT.isVector()) {
       ISD::InputArg NewArg = Arg;
       NewArg.Flags.setSplit();
       NewArg.VT = Arg.VT.getVectorElementType();

       // We REALLY want the ORIGINAL number of vertex elements here, e.g. a
       // three or five element vertex only needs three or five registers,
       // NOT four or eigth.
       Type *ParamType = FType->getParamType(Arg.OrigArgIndex);
       unsigned NumElements = ParamType->getVectorNumElements();

       for (unsigned j = 0; j != NumElements; ++j) {
         Splits.push_back(NewArg);
         NewArg.PartOffset += NewArg.VT.getStoreSize();
       }

     } else {
       Splits.push_back(Arg);
     }
   }

   SmallVector<CCValAssign, 16> ArgLocs;
   CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
                  getTargetMachine(), ArgLocs, *DAG.getContext());

   // At least one interpolation mode must be enabled or else the GPU will hang.
   if (Info->ShaderType == ShaderType::PIXEL && (Info->PSInputAddr & 0x7F) == 0) {
     Info->PSInputAddr |= 1;
     CCInfo.AllocateReg(AMDGPU::VGPR0);
     CCInfo.AllocateReg(AMDGPU::VGPR1);
   }

   AnalyzeFormalArguments(CCInfo, Splits);

   for (unsigned i = 0, e = Ins.size(), ArgIdx = 0; i != e; ++i) {

     if (Skipped & (1 << i)) {
       InVals.push_back(SDValue());
       continue;
     }

     CCValAssign &VA = ArgLocs[ArgIdx++];
     assert(VA.isRegLoc() && "Parameter must be in a register!");

     unsigned Reg = VA.getLocReg();
     MVT VT = VA.getLocVT();

     if (VT == MVT::i64) {
       // For now assume it is a pointer
       Reg = TRI->getMatchingSuperReg(Reg, AMDGPU::sub0,
                                      &AMDGPU::SReg_64RegClass);
       Reg = MF.addLiveIn(Reg, &AMDGPU::SReg_64RegClass);
       InVals.push_back(DAG.getCopyFromReg(Chain, DL, Reg, VT));
       continue;
     }

     const TargetRegisterClass *RC = TRI->getMinimalPhysRegClass(Reg, VT);

     Reg = MF.addLiveIn(Reg, RC);
     SDValue Val = DAG.getCopyFromReg(Chain, DL, Reg, VT);

     const ISD::InputArg &Arg = Ins[i];
     if (Arg.VT.isVector()) {

       // Build a vector from the registers
       Type *ParamType = FType->getParamType(Arg.OrigArgIndex);
       unsigned NumElements = ParamType->getVectorNumElements();

       SmallVector<SDValue, 4> Regs;
       Regs.push_back(Val);
       for (unsigned j = 1; j != NumElements; ++j) {
         Reg = ArgLocs[ArgIdx++].getLocReg();
         Reg = MF.addLiveIn(Reg, RC);
         Regs.push_back(DAG.getCopyFromReg(Chain, DL, Reg, VT));
       }

       // Fill up the missing vector elements
       NumElements = Arg.VT.getVectorNumElements() - NumElements;
       for (unsigned j = 0; j != NumElements; ++j)
         Regs.push_back(DAG.getUNDEF(VT));

       InVals.push_back(DAG.getNode(ISD::BUILD_VECTOR, DL, Arg.VT,
                                    Regs.data(), Regs.size()));
       continue;
     }

     InVals.push_back(Val);
   }
   return Chain;
 }

 MachineBasicBlock * SITargetLowering::EmitInstrWithCustomInserter(
     MachineInstr * MI, MachineBasicBlock * BB) const {
   MachineRegisterInfo & MRI = BB->getParent()->getRegInfo();
   MachineBasicBlock::iterator I = MI;

   switch (MI->getOpcode()) {
   default:
     return AMDGPUTargetLowering::EmitInstrWithCustomInserter(MI, BB);
   case AMDGPU::BRANCH: return BB;
   case AMDGPU::SI_WQM:
     LowerSI_WQM(MI, *BB, I, MRI);
     break;
   }
   return BB;
 }

 void SITargetLowering::LowerSI_WQM(MachineInstr *MI, MachineBasicBlock &BB,
     MachineBasicBlock::iterator I, MachineRegisterInfo & MRI) const {
   BuildMI(BB, I, BB.findDebugLoc(I), TII->get(AMDGPU::S_WQM_B64), AMDGPU::EXEC)
           .addReg(AMDGPU::EXEC);

   MI->eraseFromParent();
 }

 EVT SITargetLowering::getSetCCResultType(EVT VT) const {
   return MVT::i1;
 }

 MVT SITargetLowering::getScalarShiftAmountTy(EVT VT) const {
   return MVT::i32;
 }

 //===----------------------------------------------------------------------===//
 // Custom DAG Lowering Operations
 //===----------------------------------------------------------------------===//

 SDValue SITargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
   switch (Op.getOpcode()) {
   default: return AMDGPUTargetLowering::LowerOperation(Op, DAG);
   case ISD::BRCOND: return LowerBRCOND(Op, DAG);
   case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
   }
   return SDValue();
 }

 /// \brief Helper function for LowerBRCOND
 static SDNode *findUser(SDValue Value, unsigned Opcode) {

   SDNode *Parent = Value.getNode();
   for (SDNode::use_iterator I = Parent->use_begin(), E = Parent->use_end();
        I != E; ++I) {

     if (I.getUse().get() != Value)
       continue;

     if (I->getOpcode() == Opcode)
       return *I;
   }
   return 0;
 }

 /// This transforms the control flow intrinsics to get the branch destination as
 /// last parameter, also switches branch target with BR if the need arise
 SDValue SITargetLowering::LowerBRCOND(SDValue BRCOND,
                                       SelectionDAG &DAG) const {

   DebugLoc DL = BRCOND.getDebugLoc();

   SDNode *Intr = BRCOND.getOperand(1).getNode();
   SDValue Target = BRCOND.getOperand(2);
   SDNode *BR = 0;

   if (Intr->getOpcode() == ISD::SETCC) {
     // As long as we negate the condition everything is fine
     SDNode *SetCC = Intr;
     assert(SetCC->getConstantOperandVal(1) == 1);
     assert(cast<CondCodeSDNode>(SetCC->getOperand(2).getNode())->get() ==
            ISD::SETNE);
     Intr = SetCC->getOperand(0).getNode();

   } else {
     // Get the target from BR if we don't negate the condition
     BR = findUser(BRCOND, ISD::BR);
     Target = BR->getOperand(1);
   }

   assert(Intr->getOpcode() == ISD::INTRINSIC_W_CHAIN);

   // Build the result and
   SmallVector<EVT, 4> Res;
   for (unsigned i = 1, e = Intr->getNumValues(); i != e; ++i)
     Res.push_back(Intr->getValueType(i));

   // operands of the new intrinsic call
   SmallVector<SDValue, 4> Ops;
   Ops.push_back(BRCOND.getOperand(0));
   for (unsigned i = 1, e = Intr->getNumOperands(); i != e; ++i)
     Ops.push_back(Intr->getOperand(i));
   Ops.push_back(Target);

   // build the new intrinsic call
   SDNode *Result = DAG.getNode(
     Res.size() > 1 ? ISD::INTRINSIC_W_CHAIN : ISD::INTRINSIC_VOID, DL,
     DAG.getVTList(Res.data(), Res.size()), Ops.data(), Ops.size()).getNode();

   if (BR) {
     // Give the branch instruction our target
     SDValue Ops[] = {
       BR->getOperand(0),
       BRCOND.getOperand(2)
     };
     DAG.MorphNodeTo(BR, ISD::BR, BR->getVTList(), Ops, 2);
   }

   SDValue Chain = SDValue(Result, Result->getNumValues() - 1);

   // Copy the intrinsic results to registers
   for (unsigned i = 1, e = Intr->getNumValues() - 1; i != e; ++i) {
     SDNode *CopyToReg = findUser(SDValue(Intr, i), ISD::CopyToReg);
     if (!CopyToReg)
       continue;

     Chain = DAG.getCopyToReg(
       Chain, DL,
       CopyToReg->getOperand(1),
       SDValue(Result, i - 1),
       SDValue());

     DAG.ReplaceAllUsesWith(SDValue(CopyToReg, 0), CopyToReg->getOperand(0));
   }

   // Remove the old intrinsic from the chain
   DAG.ReplaceAllUsesOfValueWith(
     SDValue(Intr, Intr->getNumValues() - 1),
     Intr->getOperand(0));

   return Chain;
 }

 SDValue SITargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const {
   SDValue LHS = Op.getOperand(0);
   SDValue RHS = Op.getOperand(1);
   SDValue True = Op.getOperand(2);
   SDValue False = Op.getOperand(3);
   SDValue CC = Op.getOperand(4);
   EVT VT = Op.getValueType();
   DebugLoc DL = Op.getDebugLoc();

   // Possible Min/Max pattern
   SDValue MinMax = LowerMinMax(Op, DAG);
   if (MinMax.getNode()) {
     return MinMax;
   }

   SDValue Cond = DAG.getNode(ISD::SETCC, DL, MVT::i1, LHS, RHS, CC);
   return DAG.getNode(ISD::SELECT, DL, VT, Cond, True, False);
 }

 //===----------------------------------------------------------------------===//
 // Custom DAG optimizations
 //===----------------------------------------------------------------------===//

 SDValue SITargetLowering::PerformDAGCombine(SDNode *N,
                                             DAGCombinerInfo &DCI) const {
   SelectionDAG &DAG = DCI.DAG;
   DebugLoc DL = N->getDebugLoc();
   EVT VT = N->getValueType(0);

   switch (N->getOpcode()) {
     default: break;
     case ISD::SELECT_CC: {
       N->dump();
       ConstantSDNode *True, *False;
       // i1 selectcc(l, r, -1, 0, cc) -> i1 setcc(l, r, cc)
       if ((True = dyn_cast<ConstantSDNode>(N->getOperand(2)))
           && (False = dyn_cast<ConstantSDNode>(N->getOperand(3)))
           && True->isAllOnesValue()
           && False->isNullValue()
           && VT == MVT::i1) {
         return DAG.getNode(ISD::SETCC, DL, VT, N->getOperand(0),
                            N->getOperand(1), N->getOperand(4));

       }
       break;
     }
     case ISD::SETCC: {
       SDValue Arg0 = N->getOperand(0);
       SDValue Arg1 = N->getOperand(1);
       SDValue CC = N->getOperand(2);
       ConstantSDNode * C = NULL;
       ISD::CondCode CCOp = dyn_cast<CondCodeSDNode>(CC)->get();

       // i1 setcc (sext(i1), 0, setne) -> i1 setcc(i1, 0, setne)
       if (VT == MVT::i1
           && Arg0.getOpcode() == ISD::SIGN_EXTEND
           && Arg0.getOperand(0).getValueType() == MVT::i1
           && (C = dyn_cast<ConstantSDNode>(Arg1))
           && C->isNullValue()
           && CCOp == ISD::SETNE) {
         return SimplifySetCC(VT, Arg0.getOperand(0),
                              DAG.getConstant(0, MVT::i1), CCOp, true, DCI, DL);
       }
       break;
     }
   }
   return SDValue();
 }

 /// \brief Test if RegClass is one of the VSrc classes
 static bool isVSrc(unsigned RegClass) {
   return AMDGPU::VSrc_32RegClassID == RegClass ||
          AMDGPU::VSrc_64RegClassID == RegClass;
 }

 /// \brief Test if RegClass is one of the SSrc classes
 static bool isSSrc(unsigned RegClass) {
   return AMDGPU::SSrc_32RegClassID == RegClass ||
          AMDGPU::SSrc_64RegClassID == RegClass;
 }

 /// \brief Analyze the possible immediate value Op
 ///
 /// Returns -1 if it isn't an immediate, 0 if it's and inline immediate
 /// and the immediate value if it's a literal immediate
 int32_t SITargetLowering::analyzeImmediate(const SDNode *N) const {

   union {
     int32_t I;
     float F;
   } Imm;

   if (const ConstantSDNode *Node = dyn_cast<ConstantSDNode>(N))
     Imm.I = Node->getSExtValue();
   else if (const ConstantFPSDNode *Node = dyn_cast<ConstantFPSDNode>(N))
     Imm.F = Node->getValueAPF().convertToFloat();
   else
     return -1; // It isn't an immediate

   if ((Imm.I >= -16 && Imm.I <= 64) ||
       Imm.F == 0.5f || Imm.F == -0.5f ||
       Imm.F == 1.0f || Imm.F == -1.0f ||
       Imm.F == 2.0f || Imm.F == -2.0f ||
       Imm.F == 4.0f || Imm.F == -4.0f)
     return 0; // It's an inline immediate

   return Imm.I; // It's a literal immediate
 }

 /// \brief Try to fold an immediate directly into an instruction
 bool SITargetLowering::foldImm(SDValue &Operand, int32_t &Immediate,
                                bool &ScalarSlotUsed) const {

   MachineSDNode *Mov = dyn_cast<MachineSDNode>(Operand);
   if (Mov == 0 || !TII->isMov(Mov->getMachineOpcode()))
     return false;

   const SDValue &Op = Mov->getOperand(0);
   int32_t Value = analyzeImmediate(Op.getNode());
   if (Value == -1) {
     // Not an immediate at all
     return false;

   } else if (Value == 0) {
     // Inline immediates can always be fold
     Operand = Op;
     return true;

   } else if (Value == Immediate) {
     // Already fold literal immediate
     Operand = Op;
     return true;

   } else if (!ScalarSlotUsed && !Immediate) {
     // Fold this literal immediate
     ScalarSlotUsed = true;
     Immediate = Value;
     Operand = Op;
     return true;

   }

   return false;
 }

 /// \brief Does "Op" fit into register class "RegClass" ?
 bool SITargetLowering::fitsRegClass(SelectionDAG &DAG, SDValue &Op,
                                     unsigned RegClass) const {

   MachineRegisterInfo &MRI = DAG.getMachineFunction().getRegInfo();
   SDNode *Node = Op.getNode();

   int OpClass;
   if (MachineSDNode *MN = dyn_cast<MachineSDNode>(Node)) {
     const MCInstrDesc &Desc = TII->get(MN->getMachineOpcode());
     OpClass = Desc.OpInfo[Op.getResNo()].RegClass;

   } else if (Node->getOpcode() == ISD::CopyFromReg) {
     RegisterSDNode *Reg = cast<RegisterSDNode>(Node->getOperand(1).getNode());
     OpClass = MRI.getRegClass(Reg->getReg())->getID();

   } else
     return false;

   if (OpClass == -1)
     return false;

   return TRI->getRegClass(RegClass)->hasSubClassEq(TRI->getRegClass(OpClass));
 }

 /// \brief Make sure that we don't exeed the number of allowed scalars
 void SITargetLowering::ensureSRegLimit(SelectionDAG &DAG, SDValue &Operand,
                                        unsigned RegClass,
                                        bool &ScalarSlotUsed) const {

   // First map the operands register class to a destination class
   if (RegClass == AMDGPU::VSrc_32RegClassID)
     RegClass = AMDGPU::VReg_32RegClassID;
   else if (RegClass == AMDGPU::VSrc_64RegClassID)
     RegClass = AMDGPU::VReg_64RegClassID;
   else
     return;

   // Nothing todo if they fit naturaly
   if (fitsRegClass(DAG, Operand, RegClass))
     return;

   // If the scalar slot isn't used yet use it now
   if (!ScalarSlotUsed) {
     ScalarSlotUsed = true;
     return;
   }

   // This is a conservative aproach, it is possible that we can't determine
   // the correct register class and copy too often, but better save than sorry.
   SDValue RC = DAG.getTargetConstant(RegClass, MVT::i32);
   SDNode *Node = DAG.getMachineNode(TargetOpcode::COPY_TO_REGCLASS, DebugLoc(),
                                     Operand.getValueType(), Operand, RC);
   Operand = SDValue(Node, 0);
 }

 SDNode *SITargetLowering::PostISelFolding(MachineSDNode *Node,
                                           SelectionDAG &DAG) const {

   // Original encoding (either e32 or e64)
   int Opcode = Node->getMachineOpcode();
   const MCInstrDesc *Desc = &TII->get(Opcode);

   unsigned NumDefs = Desc->getNumDefs();
   unsigned NumOps = Desc->getNumOperands();

   // e64 version if available, -1 otherwise
   int OpcodeE64 = AMDGPU::getVOPe64(Opcode);
   const MCInstrDesc *DescE64 = OpcodeE64 == -1 ? 0 : &TII->get(OpcodeE64);

   assert(!DescE64 || DescE64->getNumDefs() == NumDefs);
   assert(!DescE64 || DescE64->getNumOperands() == (NumOps + 4));

   int32_t Immediate = Desc->getSize() == 4 ? 0 : -1;
   bool HaveVSrc = false, HaveSSrc = false;

   // First figure out what we alread have in this instruction
   for (unsigned i = 0, e = Node->getNumOperands(), Op = NumDefs;
        i != e && Op < NumOps; ++i, ++Op) {

     unsigned RegClass = Desc->OpInfo[Op].RegClass;
     if (isVSrc(RegClass))
       HaveVSrc = true;
     else if (isSSrc(RegClass))
       HaveSSrc = true;
     else
       continue;

     int32_t Imm = analyzeImmediate(Node->getOperand(i).getNode());
     if (Imm != -1 && Imm != 0) {
       // Literal immediate
       Immediate = Imm;
     }
   }

   // If we neither have VSrc nor SSrc it makes no sense to continue
   if (!HaveVSrc && !HaveSSrc)
     return Node;

   // No scalar allowed when we have both VSrc and SSrc
   bool ScalarSlotUsed = HaveVSrc && HaveSSrc;

   // Second go over the operands and try to fold them
   std::vector<SDValue> Ops;
   bool Promote2e64 = false;
   for (unsigned i = 0, e = Node->getNumOperands(), Op = NumDefs;
        i != e && Op < NumOps; ++i, ++Op) {

     const SDValue &Operand = Node->getOperand(i);
     Ops.push_back(Operand);

     // Already folded immediate ?
     if (isa<ConstantSDNode>(Operand.getNode()) ||
         isa<ConstantFPSDNode>(Operand.getNode()))
       continue;

     // Is this a VSrc or SSrc operand ?
     unsigned RegClass = Desc->OpInfo[Op].RegClass;
     if (!isVSrc(RegClass) && !isSSrc(RegClass)) {

       if (i == 1 && Desc->isCommutable() &&
           fitsRegClass(DAG, Ops[0], RegClass) &&
           foldImm(Ops[1], Immediate, ScalarSlotUsed)) {

         assert(isVSrc(Desc->OpInfo[NumDefs].RegClass) ||
                isSSrc(Desc->OpInfo[NumDefs].RegClass));

         // Swap commutable operands
         SDValue Tmp = Ops[1];
         Ops[1] = Ops[0];
         Ops[0] = Tmp;

       } else if (DescE64 && !Immediate) {
         // Test if it makes sense to switch to e64 encoding

         RegClass = DescE64->OpInfo[Op].RegClass;
         int32_t TmpImm = -1;
         if ((isVSrc(RegClass) || isSSrc(RegClass)) &&
             foldImm(Ops[i], TmpImm, ScalarSlotUsed)) {

           Immediate = -1;
           Promote2e64 = true;
           Desc = DescE64;
           DescE64 = 0;
         }
       }
       continue;
     }

     // Try to fold the immediates
     if (!foldImm(Ops[i], Immediate, ScalarSlotUsed)) {
       // Folding didn't worked, make sure we don't hit the SReg limit
       ensureSRegLimit(DAG, Ops[i], RegClass, ScalarSlotUsed);
     }
   }

   if (Promote2e64) {
     // Add the modifier flags while promoting
     for (unsigned i = 0; i < 4; ++i)
       Ops.push_back(DAG.getTargetConstant(0, MVT::i32));
   }

   // Add optional chain and glue
   for (unsigned i = NumOps - NumDefs, e = Node->getNumOperands(); i < e; ++i)
     Ops.push_back(Node->getOperand(i));

   // Either create a complete new or update the current instruction
   if (Promote2e64)
     return DAG.getMachineNode(OpcodeE64, Node->getDebugLoc(),
                               Node->getVTList(), Ops.data(), Ops.size());
   else
     return DAG.UpdateNodeOperands(Node, Ops.data(), Ops.size());
 }
	//===-- SIISelLowering.cpp - SI DAG Lowering Implementation ---------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	/// \file
	/// \brief Custom DAG lowering for SI
	//
	//===----------------------------------------------------------------------===//

	#include "SIISelLowering.h"
	#include "AMDIL.h"
	#include "AMDGPU.h"
	#include "AMDILIntrinsicInfo.h"
	#include "SIInstrInfo.h"
	#include "SIMachineFunctionInfo.h"
	#include "SIRegisterInfo.h"
	#include "llvm/IR/Function.h"
	#include "llvm/CodeGen/CallingConvLower.h"
	#include "llvm/CodeGen/MachineInstrBuilder.h"
	#include "llvm/CodeGen/MachineRegisterInfo.h"
	#include "llvm/CodeGen/SelectionDAG.h"

	using namespace llvm;

	SITargetLowering::SITargetLowering(TargetMachine &TM) :
	AMDGPUTargetLowering(TM),
	TII(static_cast<const SIInstrInfo*>(TM.getInstrInfo())),
	TRI(TM.getRegisterInfo()) {

	addRegisterClass(MVT::i1, &AMDGPU::SReg_64RegClass);
	addRegisterClass(MVT::i64, &AMDGPU::SReg_64RegClass);

	addRegisterClass(MVT::v16i8, &AMDGPU::SReg_128RegClass);
	addRegisterClass(MVT::v32i8, &AMDGPU::SReg_256RegClass);
	addRegisterClass(MVT::v64i8, &AMDGPU::SReg_512RegClass);

	addRegisterClass(MVT::i32, &AMDGPU::VReg_32RegClass);
	addRegisterClass(MVT::f32, &AMDGPU::VReg_32RegClass);

	addRegisterClass(MVT::v1i32, &AMDGPU::VReg_32RegClass);

	addRegisterClass(MVT::v2i32, &AMDGPU::VReg_64RegClass);
	addRegisterClass(MVT::v2f32, &AMDGPU::VReg_64RegClass);

	addRegisterClass(MVT::v4i32, &AMDGPU::VReg_128RegClass);
	addRegisterClass(MVT::v4f32, &AMDGPU::VReg_128RegClass);

	addRegisterClass(MVT::v8i32, &AMDGPU::VReg_256RegClass);
	addRegisterClass(MVT::v8f32, &AMDGPU::VReg_256RegClass);

	addRegisterClass(MVT::v16i32, &AMDGPU::VReg_512RegClass);
	addRegisterClass(MVT::v16f32, &AMDGPU::VReg_512RegClass);

	computeRegisterProperties();

	setOperationAction(ISD::ADD, MVT::i64, Legal);
	setOperationAction(ISD::ADD, MVT::i32, Legal);

	setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
	setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);

	setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
	setTargetDAGCombine(ISD::SELECT_CC);

	setTargetDAGCombine(ISD::SETCC);

	setSchedulingPreference(Sched::Source);
	}

	SDValue SITargetLowering::LowerFormalArguments(
	SDValue Chain,
	CallingConv::ID CallConv,
	bool isVarArg,
	const SmallVectorImpl<ISD::InputArg> &Ins,
	DebugLoc DL, SelectionDAG &DAG,
	SmallVectorImpl<SDValue> &InVals) const {

	const TargetRegisterInfo *TRI = getTargetMachine().getRegisterInfo();

	MachineFunction &MF = DAG.getMachineFunction();
	FunctionType *FType = MF.getFunction()->getFunctionType();
	SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();

	assert(CallConv == CallingConv::C);

	SmallVector<ISD::InputArg, 16> Splits;
	uint32_t Skipped = 0;

	for (unsigned i = 0, e = Ins.size(), PSInputNum = 0; i != e; ++i) {
	const ISD::InputArg &Arg = Ins[i];

	// First check if it's a PS input addr
	if (Info->ShaderType == ShaderType::PIXEL && !Arg.Flags.isInReg()) {

	assert((PSInputNum <= 15) && "Too many PS inputs!");

	if (!Arg.Used) {
	// We can savely skip PS inputs
	Skipped \|= 1 << i;
	++PSInputNum;
	continue;
	}

	Info->PSInputAddr \|= 1 << PSInputNum++;
	}

	// Second split vertices into their elements
	if (Arg.VT.isVector()) {
	ISD::InputArg NewArg = Arg;
	NewArg.Flags.setSplit();
	NewArg.VT = Arg.VT.getVectorElementType();

	// We REALLY want the ORIGINAL number of vertex elements here, e.g. a
	// three or five element vertex only needs three or five registers,
	// NOT four or eigth.
	Type *ParamType = FType->getParamType(Arg.OrigArgIndex);
	unsigned NumElements = ParamType->getVectorNumElements();

	for (unsigned j = 0; j != NumElements; ++j) {
	Splits.push_back(NewArg);
	NewArg.PartOffset += NewArg.VT.getStoreSize();
	}

	} else {
	Splits.push_back(Arg);
	}
	}

	SmallVector<CCValAssign, 16> ArgLocs;
	CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
	getTargetMachine(), ArgLocs, *DAG.getContext());

	// At least one interpolation mode must be enabled or else the GPU will hang.
	if (Info->ShaderType == ShaderType::PIXEL && (Info->PSInputAddr & 0x7F) == 0) {
	Info->PSInputAddr \|= 1;
	CCInfo.AllocateReg(AMDGPU::VGPR0);
	CCInfo.AllocateReg(AMDGPU::VGPR1);
	}

	AnalyzeFormalArguments(CCInfo, Splits);

	for (unsigned i = 0, e = Ins.size(), ArgIdx = 0; i != e; ++i) {

	if (Skipped & (1 << i)) {
	InVals.push_back(SDValue());
	continue;
	}

	CCValAssign &VA = ArgLocs[ArgIdx++];
	assert(VA.isRegLoc() && "Parameter must be in a register!");

	unsigned Reg = VA.getLocReg();
	MVT VT = VA.getLocVT();

	if (VT == MVT::i64) {
	// For now assume it is a pointer
	Reg = TRI->getMatchingSuperReg(Reg, AMDGPU::sub0,
	&AMDGPU::SReg_64RegClass);
	Reg = MF.addLiveIn(Reg, &AMDGPU::SReg_64RegClass);
	InVals.push_back(DAG.getCopyFromReg(Chain, DL, Reg, VT));
	continue;
	}

	const TargetRegisterClass *RC = TRI->getMinimalPhysRegClass(Reg, VT);

	Reg = MF.addLiveIn(Reg, RC);
	SDValue Val = DAG.getCopyFromReg(Chain, DL, Reg, VT);

	const ISD::InputArg &Arg = Ins[i];
	if (Arg.VT.isVector()) {

	// Build a vector from the registers
	Type *ParamType = FType->getParamType(Arg.OrigArgIndex);
	unsigned NumElements = ParamType->getVectorNumElements();

	SmallVector<SDValue, 4> Regs;
	Regs.push_back(Val);
	for (unsigned j = 1; j != NumElements; ++j) {
	Reg = ArgLocs[ArgIdx++].getLocReg();
	Reg = MF.addLiveIn(Reg, RC);
	Regs.push_back(DAG.getCopyFromReg(Chain, DL, Reg, VT));
	}

	// Fill up the missing vector elements
	NumElements = Arg.VT.getVectorNumElements() - NumElements;
	for (unsigned j = 0; j != NumElements; ++j)
	Regs.push_back(DAG.getUNDEF(VT));

	InVals.push_back(DAG.getNode(ISD::BUILD_VECTOR, DL, Arg.VT,
	Regs.data(), Regs.size()));
	continue;
	}

	InVals.push_back(Val);
	}
	return Chain;
	}

	MachineBasicBlock * SITargetLowering::EmitInstrWithCustomInserter(
	MachineInstr * MI, MachineBasicBlock * BB) const {
	MachineRegisterInfo & MRI = BB->getParent()->getRegInfo();
	MachineBasicBlock::iterator I = MI;

	switch (MI->getOpcode()) {
	default:
	return AMDGPUTargetLowering::EmitInstrWithCustomInserter(MI, BB);
	case AMDGPU::BRANCH: return BB;
	case AMDGPU::SI_WQM:
	LowerSI_WQM(MI, *BB, I, MRI);
	break;
	}
	return BB;
	}

	void SITargetLowering::LowerSI_WQM(MachineInstr *MI, MachineBasicBlock &BB,
	MachineBasicBlock::iterator I, MachineRegisterInfo & MRI) const {
	BuildMI(BB, I, BB.findDebugLoc(I), TII->get(AMDGPU::S_WQM_B64), AMDGPU::EXEC)
	.addReg(AMDGPU::EXEC);

	MI->eraseFromParent();
	}

	EVT SITargetLowering::getSetCCResultType(EVT VT) const {
	return MVT::i1;
	}

	MVT SITargetLowering::getScalarShiftAmountTy(EVT VT) const {
	return MVT::i32;
	}

	//===----------------------------------------------------------------------===//
	// Custom DAG Lowering Operations
	//===----------------------------------------------------------------------===//

	SDValue SITargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
	switch (Op.getOpcode()) {
	default: return AMDGPUTargetLowering::LowerOperation(Op, DAG);
	case ISD::BRCOND: return LowerBRCOND(Op, DAG);
	case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
	}
	return SDValue();
	}

	/// \brief Helper function for LowerBRCOND
	static SDNode *findUser(SDValue Value, unsigned Opcode) {

	SDNode *Parent = Value.getNode();
	for (SDNode::use_iterator I = Parent->use_begin(), E = Parent->use_end();
	I != E; ++I) {

	if (I.getUse().get() != Value)
	continue;

	if (I->getOpcode() == Opcode)
	return *I;
	}
	return 0;
	}

	/// This transforms the control flow intrinsics to get the branch destination as
	/// last parameter, also switches branch target with BR if the need arise
	SDValue SITargetLowering::LowerBRCOND(SDValue BRCOND,
	SelectionDAG &DAG) const {

	DebugLoc DL = BRCOND.getDebugLoc();

	SDNode *Intr = BRCOND.getOperand(1).getNode();
	SDValue Target = BRCOND.getOperand(2);
	SDNode *BR = 0;

	if (Intr->getOpcode() == ISD::SETCC) {
	// As long as we negate the condition everything is fine
	SDNode *SetCC = Intr;
	assert(SetCC->getConstantOperandVal(1) == 1);
	assert(cast<CondCodeSDNode>(SetCC->getOperand(2).getNode())->get() ==
	ISD::SETNE);
	Intr = SetCC->getOperand(0).getNode();

	} else {
	// Get the target from BR if we don't negate the condition
	BR = findUser(BRCOND, ISD::BR);
	Target = BR->getOperand(1);
	}

	assert(Intr->getOpcode() == ISD::INTRINSIC_W_CHAIN);

	// Build the result and
	SmallVector<EVT, 4> Res;
	for (unsigned i = 1, e = Intr->getNumValues(); i != e; ++i)
	Res.push_back(Intr->getValueType(i));

	// operands of the new intrinsic call
	SmallVector<SDValue, 4> Ops;
	Ops.push_back(BRCOND.getOperand(0));
	for (unsigned i = 1, e = Intr->getNumOperands(); i != e; ++i)
	Ops.push_back(Intr->getOperand(i));
	Ops.push_back(Target);

	// build the new intrinsic call
	SDNode *Result = DAG.getNode(
	Res.size() > 1 ? ISD::INTRINSIC_W_CHAIN : ISD::INTRINSIC_VOID, DL,
	DAG.getVTList(Res.data(), Res.size()), Ops.data(), Ops.size()).getNode();

	if (BR) {
	// Give the branch instruction our target
	SDValue Ops[] = {
	BR->getOperand(0),
	BRCOND.getOperand(2)
	};
	DAG.MorphNodeTo(BR, ISD::BR, BR->getVTList(), Ops, 2);
	}

	SDValue Chain = SDValue(Result, Result->getNumValues() - 1);

	// Copy the intrinsic results to registers
	for (unsigned i = 1, e = Intr->getNumValues() - 1; i != e; ++i) {
	SDNode *CopyToReg = findUser(SDValue(Intr, i), ISD::CopyToReg);
	if (!CopyToReg)
	continue;

	Chain = DAG.getCopyToReg(
	Chain, DL,
	CopyToReg->getOperand(1),
	SDValue(Result, i - 1),
	SDValue());

	DAG.ReplaceAllUsesWith(SDValue(CopyToReg, 0), CopyToReg->getOperand(0));
	}

	// Remove the old intrinsic from the chain
	DAG.ReplaceAllUsesOfValueWith(
	SDValue(Intr, Intr->getNumValues() - 1),
	Intr->getOperand(0));

	return Chain;
	}

	SDValue SITargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const {
	SDValue LHS = Op.getOperand(0);
	SDValue RHS = Op.getOperand(1);
	SDValue True = Op.getOperand(2);
	SDValue False = Op.getOperand(3);
	SDValue CC = Op.getOperand(4);
	EVT VT = Op.getValueType();
	DebugLoc DL = Op.getDebugLoc();

	// Possible Min/Max pattern
	SDValue MinMax = LowerMinMax(Op, DAG);
	if (MinMax.getNode()) {
	return MinMax;
	}

	SDValue Cond = DAG.getNode(ISD::SETCC, DL, MVT::i1, LHS, RHS, CC);
	return DAG.getNode(ISD::SELECT, DL, VT, Cond, True, False);
	}

	//===----------------------------------------------------------------------===//
	// Custom DAG optimizations
	//===----------------------------------------------------------------------===//

	SDValue SITargetLowering::PerformDAGCombine(SDNode *N,
	DAGCombinerInfo &DCI) const {
	SelectionDAG &DAG = DCI.DAG;
	DebugLoc DL = N->getDebugLoc();
	EVT VT = N->getValueType(0);

	switch (N->getOpcode()) {
	default: break;
	case ISD::SELECT_CC: {
	N->dump();
	ConstantSDNode True, False;
	// i1 selectcc(l, r, -1, 0, cc) -> i1 setcc(l, r, cc)
	if ((True = dyn_cast<ConstantSDNode>(N->getOperand(2)))
	&& (False = dyn_cast<ConstantSDNode>(N->getOperand(3)))
	&& True->isAllOnesValue()
	&& False->isNullValue()
	&& VT == MVT::i1) {
	return DAG.getNode(ISD::SETCC, DL, VT, N->getOperand(0),
	N->getOperand(1), N->getOperand(4));

	}
	break;
	}
	case ISD::SETCC: {
	SDValue Arg0 = N->getOperand(0);
	SDValue Arg1 = N->getOperand(1);
	SDValue CC = N->getOperand(2);
	ConstantSDNode * C = NULL;
	ISD::CondCode CCOp = dyn_cast<CondCodeSDNode>(CC)->get();

	// i1 setcc (sext(i1), 0, setne) -> i1 setcc(i1, 0, setne)
	if (VT == MVT::i1
	&& Arg0.getOpcode() == ISD::SIGN_EXTEND
	&& Arg0.getOperand(0).getValueType() == MVT::i1
	&& (C = dyn_cast<ConstantSDNode>(Arg1))
	&& C->isNullValue()
	&& CCOp == ISD::SETNE) {
	return SimplifySetCC(VT, Arg0.getOperand(0),
	DAG.getConstant(0, MVT::i1), CCOp, true, DCI, DL);
	}
	break;
	}
	}
	return SDValue();
	}

	/// \brief Test if RegClass is one of the VSrc classes
	static bool isVSrc(unsigned RegClass) {
	return AMDGPU::VSrc_32RegClassID == RegClass \|\|
	AMDGPU::VSrc_64RegClassID == RegClass;
	}

	/// \brief Test if RegClass is one of the SSrc classes
	static bool isSSrc(unsigned RegClass) {
	return AMDGPU::SSrc_32RegClassID == RegClass \|\|
	AMDGPU::SSrc_64RegClassID == RegClass;
	}

	/// \brief Analyze the possible immediate value Op
	///
	/// Returns -1 if it isn't an immediate, 0 if it's and inline immediate
	/// and the immediate value if it's a literal immediate
	int32_t SITargetLowering::analyzeImmediate(const SDNode *N) const {

	union {
	int32_t I;
	float F;
	} Imm;

	if (const ConstantSDNode *Node = dyn_cast<ConstantSDNode>(N))
	Imm.I = Node->getSExtValue();
	else if (const ConstantFPSDNode *Node = dyn_cast<ConstantFPSDNode>(N))
	Imm.F = Node->getValueAPF().convertToFloat();
	else
	return -1; // It isn't an immediate

	if ((Imm.I >= -16 && Imm.I <= 64) \|\|
	Imm.F == 0.5f \|\| Imm.F == -0.5f \|\|
	Imm.F == 1.0f \|\| Imm.F == -1.0f \|\|
	Imm.F == 2.0f \|\| Imm.F == -2.0f \|\|
	Imm.F == 4.0f \|\| Imm.F == -4.0f)
	return 0; // It's an inline immediate

	return Imm.I; // It's a literal immediate
	}

	/// \brief Try to fold an immediate directly into an instruction
	bool SITargetLowering::foldImm(SDValue &Operand, int32_t &Immediate,
	bool &ScalarSlotUsed) const {

	MachineSDNode *Mov = dyn_cast<MachineSDNode>(Operand);
	if (Mov == 0 \|\| !TII->isMov(Mov->getMachineOpcode()))
	return false;

	const SDValue &Op = Mov->getOperand(0);
	int32_t Value = analyzeImmediate(Op.getNode());
	if (Value == -1) {
	// Not an immediate at all
	return false;

	} else if (Value == 0) {
	// Inline immediates can always be fold
	Operand = Op;
	return true;

	} else if (Value == Immediate) {
	// Already fold literal immediate
	Operand = Op;
	return true;

	} else if (!ScalarSlotUsed && !Immediate) {
	// Fold this literal immediate
	ScalarSlotUsed = true;
	Immediate = Value;
	Operand = Op;
	return true;

	}

	return false;
	}

	/// \brief Does "Op" fit into register class "RegClass" ?
	bool SITargetLowering::fitsRegClass(SelectionDAG &DAG, SDValue &Op,
	unsigned RegClass) const {

	MachineRegisterInfo &MRI = DAG.getMachineFunction().getRegInfo();
	SDNode *Node = Op.getNode();

	int OpClass;
	if (MachineSDNode *MN = dyn_cast<MachineSDNode>(Node)) {
	const MCInstrDesc &Desc = TII->get(MN->getMachineOpcode());
	OpClass = Desc.OpInfo[Op.getResNo()].RegClass;

	} else if (Node->getOpcode() == ISD::CopyFromReg) {
	RegisterSDNode *Reg = cast<RegisterSDNode>(Node->getOperand(1).getNode());
	OpClass = MRI.getRegClass(Reg->getReg())->getID();

	} else
	return false;

	if (OpClass == -1)
	return false;

	return TRI->getRegClass(RegClass)->hasSubClassEq(TRI->getRegClass(OpClass));
	}

	/// \brief Make sure that we don't exeed the number of allowed scalars
	void SITargetLowering::ensureSRegLimit(SelectionDAG &DAG, SDValue &Operand,
	unsigned RegClass,
	bool &ScalarSlotUsed) const {

	// First map the operands register class to a destination class
	if (RegClass == AMDGPU::VSrc_32RegClassID)
	RegClass = AMDGPU::VReg_32RegClassID;
	else if (RegClass == AMDGPU::VSrc_64RegClassID)
	RegClass = AMDGPU::VReg_64RegClassID;
	else
	return;

	// Nothing todo if they fit naturaly
	if (fitsRegClass(DAG, Operand, RegClass))
	return;

	// If the scalar slot isn't used yet use it now
	if (!ScalarSlotUsed) {
	ScalarSlotUsed = true;
	return;
	}

	// This is a conservative aproach, it is possible that we can't determine
	// the correct register class and copy too often, but better save than sorry.
	SDValue RC = DAG.getTargetConstant(RegClass, MVT::i32);
	SDNode *Node = DAG.getMachineNode(TargetOpcode::COPY_TO_REGCLASS, DebugLoc(),
	Operand.getValueType(), Operand, RC);
	Operand = SDValue(Node, 0);
	}

	SDNode SITargetLowering::PostISelFolding(MachineSDNode Node,
	SelectionDAG &DAG) const {

	// Original encoding (either e32 or e64)
	int Opcode = Node->getMachineOpcode();
	const MCInstrDesc *Desc = &TII->get(Opcode);

	unsigned NumDefs = Desc->getNumDefs();
	unsigned NumOps = Desc->getNumOperands();

	// e64 version if available, -1 otherwise
	int OpcodeE64 = AMDGPU::getVOPe64(Opcode);
	const MCInstrDesc *DescE64 = OpcodeE64 == -1 ? 0 : &TII->get(OpcodeE64);

	assert(!DescE64 \|\| DescE64->getNumDefs() == NumDefs);
	assert(!DescE64 \|\| DescE64->getNumOperands() == (NumOps + 4));

	int32_t Immediate = Desc->getSize() == 4 ? 0 : -1;
	bool HaveVSrc = false, HaveSSrc = false;

	// First figure out what we alread have in this instruction
	for (unsigned i = 0, e = Node->getNumOperands(), Op = NumDefs;
	i != e && Op < NumOps; ++i, ++Op) {

	unsigned RegClass = Desc->OpInfo[Op].RegClass;
	if (isVSrc(RegClass))
	HaveVSrc = true;
	else if (isSSrc(RegClass))
	HaveSSrc = true;
	else
	continue;

	int32_t Imm = analyzeImmediate(Node->getOperand(i).getNode());
	if (Imm != -1 && Imm != 0) {
	// Literal immediate
	Immediate = Imm;
	}
	}

	// If we neither have VSrc nor SSrc it makes no sense to continue
	if (!HaveVSrc && !HaveSSrc)
	return Node;

	// No scalar allowed when we have both VSrc and SSrc
	bool ScalarSlotUsed = HaveVSrc && HaveSSrc;

	// Second go over the operands and try to fold them
	std::vector<SDValue> Ops;
	bool Promote2e64 = false;
	for (unsigned i = 0, e = Node->getNumOperands(), Op = NumDefs;
	i != e && Op < NumOps; ++i, ++Op) {

	const SDValue &Operand = Node->getOperand(i);
	Ops.push_back(Operand);

	// Already folded immediate ?
	if (isa<ConstantSDNode>(Operand.getNode()) \|\|
	isa<ConstantFPSDNode>(Operand.getNode()))
	continue;

	// Is this a VSrc or SSrc operand ?
	unsigned RegClass = Desc->OpInfo[Op].RegClass;
	if (!isVSrc(RegClass) && !isSSrc(RegClass)) {

	if (i == 1 && Desc->isCommutable() &&
	fitsRegClass(DAG, Ops[0], RegClass) &&
	foldImm(Ops[1], Immediate, ScalarSlotUsed)) {

	assert(isVSrc(Desc->OpInfo[NumDefs].RegClass) \|\|
	isSSrc(Desc->OpInfo[NumDefs].RegClass));

	// Swap commutable operands
	SDValue Tmp = Ops[1];
	Ops[1] = Ops[0];
	Ops[0] = Tmp;

	} else if (DescE64 && !Immediate) {
	// Test if it makes sense to switch to e64 encoding

	RegClass = DescE64->OpInfo[Op].RegClass;
	int32_t TmpImm = -1;
	if ((isVSrc(RegClass) \|\| isSSrc(RegClass)) &&
	foldImm(Ops[i], TmpImm, ScalarSlotUsed)) {

	Immediate = -1;
	Promote2e64 = true;
	Desc = DescE64;
	DescE64 = 0;
	}
	}
	continue;
	}

	// Try to fold the immediates
	if (!foldImm(Ops[i], Immediate, ScalarSlotUsed)) {
	// Folding didn't worked, make sure we don't hit the SReg limit
	ensureSRegLimit(DAG, Ops[i], RegClass, ScalarSlotUsed);
	}
	}

	if (Promote2e64) {
	// Add the modifier flags while promoting
	for (unsigned i = 0; i < 4; ++i)
	Ops.push_back(DAG.getTargetConstant(0, MVT::i32));
	}

	// Add optional chain and glue
	for (unsigned i = NumOps - NumDefs, e = Node->getNumOperands(); i < e; ++i)
	Ops.push_back(Node->getOperand(i));

	// Either create a complete new or update the current instruction
	if (Promote2e64)
	return DAG.getMachineNode(OpcodeE64, Node->getDebugLoc(),
	Node->getVTList(), Ops.data(), Ops.size());
	else
	return DAG.UpdateNodeOperands(Node, Ops.data(), Ops.size());
	}