[NFC] Use [MC]Register for x86 target

[gjain]

Fixed a few additional instances

[mtrofin]

llvm/lib/Target/X86/X86DomainReassignment.cpp

223–224

what type is X86::GR8RegClass?

[gjain]

Fix Typo

llvm/lib/Target/X86/X86DomainReassignment.cpp

223–224

I believe it is TargetRegisterClass

[mtrofin]

lgtm

llvm/lib/Target/X86/X86CallFrameOptimization.cpp

private:
   bool isProfitable(MachineFunction &MF, ContextVector &CallSeqMap);
 
   void collectCallInfo(MachineFunction &MF, MachineBasicBlock &MBB,
                        MachineBasicBlock::iterator I, CallContext &Context);
 
   void adjustCallSequence(MachineFunction &MF, const CallContext &Context);
 
   MachineInstr *canFoldIntoRegPush(MachineBasicBlock::iterator FrameSetup,
-                                   unsigned Reg);
+                                   Register Reg);
 
   enum InstClassification { Convert, Skip, Exit };
 
   InstClassification classifyInstruction(MachineBasicBlock &MBB,
                                          MachineBasicBlock::iterator MI,
                                          const X86RegisterInfo &RegInfo,
                                          DenseSet<unsigned int> &UsedRegs);
 
X86CallFrameOptimization::classifyInstruction(
 
   if (MI->isCall() || MI->mayStore())
     return Exit;
 
   for (const MachineOperand &MO : MI->operands()) {
     if (!MO.isReg())
       continue;
     Register Reg = MO.getReg();
-    if (!Register::isPhysicalRegister(Reg))
+    if (!Reg.isPhysical())
       continue;
     if (RegInfo.regsOverlap(Reg, RegInfo.getStackRegister()))
       return Exit;
     if (MO.isDef()) {
       for (unsigned int U : UsedRegs)
         if (RegInfo.regsOverlap(Reg, U))
           return Exit;
     }
for (InstClassification Classification = Skip; Classification != Exit; ++I) {
     if (Context.ArgStoreVector[StackDisp] != nullptr)
       return;
     Context.ArgStoreVector[StackDisp] = &*I;
 
     for (const MachineOperand &MO : I->uses()) {
       if (!MO.isReg())
         continue;
       Register Reg = MO.getReg();
-      if (Register::isPhysicalRegister(Reg))
+      if (Reg.isPhysical())
         UsedRegs.insert(Reg);
     }
   }
 
   --I;
 
   // We now expect the end of the sequence. If we stopped early,
   // or reached the end of the block without finding a call, bail.
void X86CallFrameOptimization::adjustCallSequence(MachineFunction &MF,
 
   // Once we've done this, we need to make sure PEI doesn't assume a reserved
   // frame.
   X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
   FuncInfo->setHasPushSequences(true);
 }
 
 MachineInstr *X86CallFrameOptimization::canFoldIntoRegPush(
-    MachineBasicBlock::iterator FrameSetup, unsigned Reg) {
+    MachineBasicBlock::iterator FrameSetup, Register Reg) {
   // Do an extremely restricted form of load folding.
   // ISel will often create patterns like:
   // movl    4(%edi), %eax
   // movl    8(%edi), %ecx
   // movl    12(%edi), %edx
   // movl    %edx, 8(%esp)
   // movl    %ecx, 4(%esp)
   // movl    %eax, (%esp)
   // call
   // Get rid of those with prejudice.
-  if (!Register::isVirtualRegister(Reg))
+  if (!Reg.isVirtual())
     return nullptr;
 
   // Make sure this is the only use of Reg.
   if (!MRI->hasOneNonDBGUse(Reg))
     return nullptr;
 
   MachineInstr &DefMI = *MRI->getVRegDef(Reg);
 

llvm/lib/Target/X86/X86CmovConversion.cpp

for (auto *MBB : Blocks) {
         unsigned MIDepth = 0;
         unsigned MIDepthOpt = 0;
         bool IsCMOV = CmovInstructions.count(&MI);
         for (auto &MO : MI.uses()) {
           // Checks for "isUse()" as "uses()" returns also implicit definitions.
           if (!MO.isReg() || !MO.isUse())
             continue;
           Register Reg = MO.getReg();
-          auto &RDM = RegDefMaps[Register::isVirtualRegister(Reg)];
+          auto &RDM = RegDefMaps[Reg.isVirtual()];
           if (MachineInstr *DefMI = RDM.lookup(Reg)) {
             OperandToDefMap[&MO] = DefMI;
             DepthInfo Info = DepthMap.lookup(DefMI);
             MIDepth = std::max(MIDepth, Info.Depth);
             if (!IsCMOV)
               MIDepthOpt = std::max(MIDepthOpt, Info.OptDepth);
           }
         }
 
         if (IsCMOV)
           MIDepthOpt = getDepthOfOptCmov(
               DepthMap[OperandToDefMap.lookup(&MI.getOperand(1))].OptDepth,
               DepthMap[OperandToDefMap.lookup(&MI.getOperand(2))].OptDepth);
 
         // Iterates over all operands to handle implicit definitions as well.
         for (auto &MO : MI.operands()) {
           if (!MO.isReg() || !MO.isDef())
             continue;
           Register Reg = MO.getReg();
-          RegDefMaps[Register::isVirtualRegister(Reg)][Reg] = &MI;
+          RegDefMaps[Reg.isVirtual()][Reg] = &MI;
         }
 
         unsigned Latency = TSchedModel.computeInstrLatency(&MI);
         DepthMap[&MI] = {MIDepth += Latency, MIDepthOpt += Latency};
         MaxDepth.Depth = std::max(MaxDepth.Depth, MIDepth);
         MaxDepth.OptDepth = std::max(MaxDepth.OptDepth, MIDepthOpt);
       }
     }

llvm/lib/Target/X86/X86DomainReassignment.cpp

public:
   bool isLegal(const MachineInstr *MI,
                const TargetInstrInfo *TII) const override {
     if (!InstrConverterBase::isLegal(MI, TII))
       return false;
 
     // Don't allow copies to/flow GR8/GR16 physical registers.
     // FIXME: Is there some better way to support this?
     Register DstReg = MI->getOperand(0).getReg();
-    if (Register::isPhysicalRegister(DstReg) &&
-        (X86::GR8RegClass.contains(DstReg) ||
+    if (DstReg.isPhysical() && (X86::GR8RegClass.contains(DstReg) ||
                                 X86::GR16RegClass.contains(DstReg)))
       return false;
     Register SrcReg = MI->getOperand(1).getReg();
-    if (Register::isPhysicalRegister(SrcReg) &&
-        (X86::GR8RegClass.contains(SrcReg) ||
+    if (SrcReg.isPhysical() && (X86::GR8RegClass.contains(SrcReg) ||
                                 X86::GR16RegClass.contains(SrcReg)))
       return false;
 
     return true;
   }
 
   double getExtraCost(const MachineInstr *MI,
                       MachineRegisterInfo *MRI) const override {
     assert(MI->getOpcode() == TargetOpcode::COPY && "Expected a COPY");

 ///
 /// A closure that computes an address (i.e. defines a virtual register that is
 /// used in a memory operand) excludes the instructions that contain memory
 /// operands using the address. Such an instruction will be included in a
 /// different closure that manipulates the loaded or stored value.
 class Closure {
 private:
   /// Virtual registers in the closure.
-  DenseSet<unsigned> Edges;
+  DenseSet<Register> Edges;
 
   /// Instructions in the closure.
   SmallVector<MachineInstr *, 8> Instrs;
 
   /// Domains which this closure can legally be reassigned to.
   std::bitset<NumDomains> LegalDstDomains;
 
   /// An ID to uniquely identify this closure, even when it gets
public:
   /// \returns true if is legal to reassign this closure to domain \p RD.
   bool isLegal(RegDomain RD) const { return LegalDstDomains[RD]; }
 
   /// Mark this closure as illegal for reassignment to domain \p RD.
   void setIllegal(RegDomain RD) { LegalDstDomains[RD] = false; }
 
   bool empty() const { return Edges.empty(); }
 
-  bool insertEdge(unsigned Reg) {
-    return Edges.insert(Reg).second;
-  }
+  bool insertEdge(Register Reg) { return Edges.insert(Reg).second; }
 
-  using const_edge_iterator = DenseSet<unsigned>::const_iterator;
+  using const_edge_iterator = DenseSet<Register>::const_iterator;
   iterator_range<const_edge_iterator> edges() const {
     return iterator_range<const_edge_iterator>(Edges.begin(), Edges.end());
   }
 
   void addInstruction(MachineInstr *I) {
     Instrs.push_back(I);
   }
 
   ArrayRef<MachineInstr *> instructions() const {
     return Instrs;
   }
 
   LLVM_DUMP_METHOD void dump(const MachineRegisterInfo *MRI) const {
     dbgs() << "Registers: ";
     bool First = true;
-    for (unsigned Reg : Edges) {
+    for (Register Reg : Edges) {
       if (!First)
         dbgs() << ", ";
       First = false;
       dbgs() << printReg(Reg, MRI->getTargetRegisterInfo(), 0, MRI);
     }
     dbgs() << "\n" << "Instructions:";
     for (MachineInstr *MI : Instrs) {
       dbgs() << "\n  ";

 private:
   /// A map of available Instruction Converters.
   InstrConverterBaseMap Converters;
 
   /// Initialize Converters map.
   void initConverters();
 
   /// Starting from \Reg, expand the closure as much as possible.
-  void buildClosure(Closure &, unsigned Reg);
+  void buildClosure(Closure &, Register Reg);
 
   /// Enqueue \p Reg to be considered for addition to the closure.
-  void visitRegister(Closure &, unsigned Reg, RegDomain &Domain,
+  void visitRegister(Closure &, Register Reg, RegDomain &Domain,
                      SmallVectorImpl<unsigned> &Worklist);
 
   /// Reassign the closure to \p Domain.
   void reassign(const Closure &C, RegDomain Domain) const;
 
   /// Add \p MI to the closure.
   void encloseInstr(Closure &C, MachineInstr *MI);
 
   /// /returns true if it is profitable to reassign the closure to \p Domain.
   bool isReassignmentProfitable(const Closure &C, RegDomain Domain) const;
 
   /// Calculate the total cost of reassigning the closure to \p Domain.
   double calculateCost(const Closure &C, RegDomain Domain) const;
 };
 
 char X86DomainReassignment::ID = 0;
 
 } // End anonymous namespace.
 
-void X86DomainReassignment::visitRegister(Closure &C, unsigned Reg,
+void X86DomainReassignment::visitRegister(Closure &C, Register Reg,
                                           RegDomain &Domain,
                                           SmallVectorImpl<unsigned> &Worklist) {
   if (EnclosedEdges.count(Reg))
     return;
 
-  if (!Register::isVirtualRegister(Reg))
+  if (!Reg.isVirtual())
     return;
 
   if (!MRI->hasOneDef(Reg))
     return;
 
   RegDomain RD = getDomain(MRI->getRegClass(Reg), MRI->getTargetRegisterInfo());
   // First edge in closure sets the domain.
   if (Domain == NoDomain)
void X86DomainReassignment::reassign(const Closure &C, RegDomain Domain) const {
   SmallVector<MachineInstr *, 8> ToErase;
   for (auto *MI : C.instructions())
     if (Converters.find({Domain, MI->getOpcode()})
             ->second->convertInstr(MI, TII, MRI))
       ToErase.push_back(MI);
 
   // Iterate all registers in the closure, replace them with registers in the
   // destination domain.
-  for (unsigned Reg : C.edges()) {
+  for (Register Reg : C.edges()) {
     MRI->setRegClass(Reg, getDstRC(MRI->getRegClass(Reg), Domain));
     for (auto &MO : MRI->use_operands(Reg)) {
       if (MO.isReg())
         // Remove all subregister references as they are not valid in the
         // destination domain.
         MO.setSubReg(0);
     }
   }
 
   for (auto *MI : ToErase)
     MI->eraseFromParent();
 }
 
 /// \returns true when \p Reg is used as part of an address calculation in \p
 /// MI.
-static bool usedAsAddr(const MachineInstr &MI, unsigned Reg,
+static bool usedAsAddr(const MachineInstr &MI, Register Reg,
                        const TargetInstrInfo *TII) {
   if (!MI.mayLoadOrStore())
     return false;
 
   const MCInstrDesc &Desc = TII->get(MI.getOpcode());
   int MemOpStart = X86II::getMemoryOperandNo(Desc.TSFlags);
   if (MemOpStart == -1)
     return false;
 
   MemOpStart += X86II::getOperandBias(Desc);
   for (unsigned MemOpIdx = MemOpStart,
                 MemOpEnd = MemOpStart + X86::AddrNumOperands;
        MemOpIdx < MemOpEnd; ++MemOpIdx) {
     const MachineOperand &Op = MI.getOperand(MemOpIdx);
     if (Op.isReg() && Op.getReg() == Reg)
       return true;
   }
   return false;
 }
 
-void X86DomainReassignment::buildClosure(Closure &C, unsigned Reg) {
+void X86DomainReassignment::buildClosure(Closure &C, Register Reg) {
   SmallVector<unsigned, 4> Worklist;
   RegDomain Domain = NoDomain;
   visitRegister(C, Reg, Domain, Worklist);
   while (!Worklist.empty()) {
     unsigned CurReg = Worklist.pop_back_val();
 
     // Register already in this closure.
     if (!C.insertEdge(CurReg))
for (auto &UseMI : MRI->use_nodbg_instructions(CurReg)) {
       }
       encloseInstr(C, &UseMI);
 
       for (auto &DefOp : UseMI.defs()) {
         if (!DefOp.isReg())
           continue;
 
         Register DefReg = DefOp.getReg();
-        if (!Register::isVirtualRegister(DefReg)) {
+        if (!DefReg.isVirtual()) {
           C.setAllIllegal();
           continue;
         }
         visitRegister(C, DefReg, Domain, Worklist);
       }
     }
   }
 }
bool X86DomainReassignment::runOnMachineFunction(MachineFunction &MF) {
   EnclosedEdges.clear();
   EnclosedInstrs.clear();
 
   std::vector<Closure> Closures;
 
   // Go over all virtual registers and calculate a closure.
   unsigned ClosureID = 0;
   for (unsigned Idx = 0; Idx < MRI->getNumVirtRegs(); ++Idx) {
-    unsigned Reg = Register::index2VirtReg(Idx);
+    Register Reg = Register::index2VirtReg(Idx);
 
     // GPR only current source domain supported.
     if (!isGPR(MRI->getRegClass(Reg)))
       continue;
 
     // Register already in closure.
     if (EnclosedEdges.count(Reg))
       continue;

llvm/lib/Target/X86/X86FlagsCopyLowering.cpp

private:
   const X86InstrInfo *TII = nullptr;
   const TargetRegisterInfo *TRI = nullptr;
   const TargetRegisterClass *PromoteRC = nullptr;
   MachineDominatorTree *MDT = nullptr;
 
   CondRegArray collectCondsInRegs(MachineBasicBlock &MBB,
                                   MachineBasicBlock::iterator CopyDefI);
 
-  unsigned promoteCondToReg(MachineBasicBlock &MBB,
+  Register promoteCondToReg(MachineBasicBlock &MBB,
                             MachineBasicBlock::iterator TestPos,
                             DebugLoc TestLoc, X86::CondCode Cond);
   std::pair<unsigned, bool>
   getCondOrInverseInReg(MachineBasicBlock &TestMBB,
                         MachineBasicBlock::iterator TestPos, DebugLoc TestLoc,
                         X86::CondCode Cond, CondRegArray &CondRegs);
   void insertTest(MachineBasicBlock &MBB, MachineBasicBlock::iterator Pos,
                   DebugLoc Loc, unsigned Reg);
CondRegArray X86FlagsCopyLoweringPass::collectCondsInRegs(
     MachineBasicBlock &MBB, MachineBasicBlock::iterator TestPos) {
   CondRegArray CondRegs = {};
 
   // Scan backwards across the range of instructions with live EFLAGS.
   for (MachineInstr &MI :
        llvm::reverse(llvm::make_range(MBB.begin(), TestPos))) {
     X86::CondCode Cond = X86::getCondFromSETCC(MI);
     if (Cond != X86::COND_INVALID && !MI.mayStore() &&
-        MI.getOperand(0).isReg() &&
-        Register::isVirtualRegister(MI.getOperand(0).getReg())) {
+        MI.getOperand(0).isReg() && MI.getOperand(0).getReg().isVirtual()) {
       assert(MI.getOperand(0).isDef() &&
              "A non-storing SETcc should always define a register!");
       CondRegs[Cond] = MI.getOperand(0).getReg();
     }
 
     // Stop scanning when we see the first definition of the EFLAGS as prior to
     // this we would potentially capture the wrong flag state.
     if (MI.findRegisterDefOperand(X86::EFLAGS))
       break;
   }
   return CondRegs;
 }
 
-unsigned X86FlagsCopyLoweringPass::promoteCondToReg(
+Register X86FlagsCopyLoweringPass::promoteCondToReg(
     MachineBasicBlock &TestMBB, MachineBasicBlock::iterator TestPos,
     DebugLoc TestLoc, X86::CondCode Cond) {
   Register Reg = MRI->createVirtualRegister(PromoteRC);
   auto SetI = BuildMI(TestMBB, TestPos, TestLoc,
                       TII->get(X86::SETCCr), Reg).addImm(Cond);
   (void)SetI;
   LLVM_DEBUG(dbgs() << "    save cond: "; SetI->dump());
   ++NumSetCCsInserted;

llvm/lib/Target/X86/X86ISelLowering.cpp

if (Op == ISD::TRUNCATE) {
       }
     }
     break;
   }
 
   int FI = INT_MAX;
   if (Arg.getOpcode() == ISD::CopyFromReg) {
     Register VR = cast<RegisterSDNode>(Arg.getOperand(1))->getReg();
-    if (!Register::isVirtualRegister(VR))
+    if (!VR.isVirtual())
       return false;
     MachineInstr *Def = MRI->getVRegDef(VR);
     if (!Def)
       return false;
     if (!Flags.isByVal()) {
       if (!TII->isLoadFromStackSlot(*Def, FI))
         return false;
     } else {

llvm/lib/Target/X86/X86InstrInfo.cpp

if (hasStoreToStackSlot(MI, Accesses)) {
               ->getFrameIndex();
       return 1;
     }
   }
   return 0;
 }
 
 /// Return true if register is PIC base; i.e.g defined by X86::MOVPC32r.
-static bool regIsPICBase(unsigned BaseReg, const MachineRegisterInfo &MRI) {
+static bool regIsPICBase(Register BaseReg, const MachineRegisterInfo &MRI) {
   // Don't waste compile time scanning use-def chains of physregs.
-  if (!Register::isVirtualRegister(BaseReg))
+  if (!BaseReg.isVirtual())
     return false;
   bool isPICBase = false;
   for (MachineRegisterInfo::def_instr_iterator I = MRI.def_instr_begin(BaseReg),
          E = MRI.def_instr_end(); I != E; ++I) {
     MachineInstr *DefMI = &*I;
     if (DefMI->getOpcode() != X86::MOVPC32r)
       return false;
     assert(!isPICBase && "More than one PIC base?");
bool X86InstrInfo::classifyLEAReg(MachineInstr &MI, const MachineOperand &Src,
 
   // For both LEA64 and LEA32 the register already has essentially the right
   // type (32-bit or 64-bit) we may just need to forbid SP.
   if (Opc != X86::LEA64_32r) {
     NewSrc = SrcReg;
     isKill = Src.isKill();
     assert(!Src.isUndef() && "Undef op doesn't need optimization");
 
-    if (Register::isVirtualRegister(NewSrc) &&
-        !MF.getRegInfo().constrainRegClass(NewSrc, RC))
+    if (NewSrc.isVirtual() && !MF.getRegInfo().constrainRegClass(NewSrc, RC))
       return false;
 
     return true;
   }
 
   // This is for an LEA64_32r and incoming registers are 32-bit. One way or
   // another we need to add 64-bit registers to the final MI.
-  if (Register::isPhysicalRegister(SrcReg)) {
+  if (SrcReg.isPhysical()) {
     ImplicitOp = Src;
     ImplicitOp.setImplicit();
 
     NewSrc = getX86SubSuperRegister(Src.getReg(), 64);
     isKill = Src.isKill();
     assert(!Src.isUndef() && "Undef op doesn't need optimization");
   } else {
     // Virtual register of the wrong class, we have to create a temporary 64-bit
X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
   switch (MIOpc) {
   default: llvm_unreachable("Unreachable!");
   case X86::SHL64ri: {
     assert(MI.getNumOperands() >= 3 && "Unknown shift instruction!");
     unsigned ShAmt = getTruncatedShiftCount(MI, 2);
     if (!isTruncatedShiftCountForLEA(ShAmt)) return nullptr;
 
     // LEA can't handle RSP.
-    if (Register::isVirtualRegister(Src.getReg()) &&
-        !MF.getRegInfo().constrainRegClass(Src.getReg(),
-                                           &X86::GR64_NOSPRegClass))
+    if (Src.getReg().isVirtual() && !MF.getRegInfo().constrainRegClass(
+                                        Src.getReg(), &X86::GR64_NOSPRegClass))
       return nullptr;
 
     NewMI = BuildMI(MF, MI.getDebugLoc(), get(X86::LEA64r))
                 .add(Dest)
                 .addReg(0)
                 .addImm(1ULL << ShAmt)
                 .add(Src)
                 .addImm(0)
unsigned X86InstrInfo::getPartialRegUpdateClearance(
     const MachineInstr &MI, unsigned OpNum,
     const TargetRegisterInfo *TRI) const {
   if (OpNum != 0 || !hasPartialRegUpdate(MI.getOpcode(), Subtarget))
     return 0;
 
   // If MI is marked as reading Reg, the partial register update is wanted.
   const MachineOperand &MO = MI.getOperand(0);
   Register Reg = MO.getReg();
-  if (Register::isVirtualRegister(Reg)) {
+  if (Reg.isVirtual()) {
     if (MO.readsReg() || MI.readsVirtualRegister(Reg))
       return 0;
   } else {
     if (MI.readsRegister(Reg, TRI))
       return 0;
   }
 
   // If any instructions in the clearance range are reading Reg, insert a
static void updateOperandRegConstraints(MachineFunction &MF,
   const TargetRegisterInfo &TRI = *MRI.getTargetRegisterInfo();
 
   for (int Idx : llvm::seq<int>(0, NewMI.getNumOperands())) {
     MachineOperand &MO = NewMI.getOperand(Idx);
     // We only need to update constraints on virtual register operands.
     if (!MO.isReg())
       continue;
     Register Reg = MO.getReg();
-    if (!Register::isVirtualRegister(Reg))
+    if (!Reg.isVirtual())
       continue;
 
     auto *NewRC = MRI.constrainRegClass(
         Reg, TII.getRegClass(NewMI.getDesc(), Idx, &TRI, MF));
     if (!NewRC) {
       LLVM_DEBUG(
           dbgs() << "WARNING: Unable to update register constraint for operand "
                  << Idx << " of instruction:\n";
if (I != nullptr) {
     else
       NewMI = FuseInst(MF, Opcode, OpNum, MOs, InsertPt, MI, *this);
 
     if (NarrowToMOV32rm) {
       // If this is the special case where we use a MOV32rm to load a 32-bit
       // value and zero-extend the top bits. Change the destination register
       // to a 32-bit one.
       Register DstReg = NewMI->getOperand(0).getReg();
-      if (Register::isPhysicalRegister(DstReg))
+      if (DstReg.isPhysical())
         NewMI->getOperand(0).setReg(RI.getSubReg(DstReg, X86::sub_32bit));
       else
         NewMI->getOperand(0).setSubReg(X86::sub_32bit);
     }
     return NewMI;
   }
 
   // If the instruction and target operand are commutable, commute the

llvm/lib/Target/X86/X86InstructionSelector.cpp

if (RC == &X86::GR32RegClass) {
     SubIdx = X86::sub_16bit;
   } else if (RC == &X86::GR8RegClass) {
     SubIdx = X86::sub_8bit;
   }
 
   return SubIdx;
 }
 
-static const TargetRegisterClass *getRegClassFromGRPhysReg(unsigned Reg) {
-  assert(Register::isPhysicalRegister(Reg));
+static const TargetRegisterClass *getRegClassFromGRPhysReg(Register Reg) {
+  assert(Reg.isPhysical());
   if (X86::GR64RegClass.contains(Reg))
     return &X86::GR64RegClass;
   if (X86::GR32RegClass.contains(Reg))
     return &X86::GR32RegClass;
   if (X86::GR16RegClass.contains(Reg))
     return &X86::GR16RegClass;
   if (X86::GR8RegClass.contains(Reg))
     return &X86::GR8RegClass;
 
   llvm_unreachable("Unknown RegClass for PhysReg!");
 }
 
 // Set X86 Opcode and constrain DestReg.
 bool X86InstructionSelector::selectCopy(MachineInstr &I,
                                         MachineRegisterInfo &MRI) const {
   Register DstReg = I.getOperand(0).getReg();
   const unsigned DstSize = RBI.getSizeInBits(DstReg, MRI, TRI);
   const RegisterBank &DstRegBank = *RBI.getRegBank(DstReg, MRI, TRI);
 
   Register SrcReg = I.getOperand(1).getReg();
   const unsigned SrcSize = RBI.getSizeInBits(SrcReg, MRI, TRI);
   const RegisterBank &SrcRegBank = *RBI.getRegBank(SrcReg, MRI, TRI);
 
-  if (Register::isPhysicalRegister(DstReg)) {
+  if (DstReg.isPhysical()) {
     assert(I.isCopy() && "Generic operators do not allow physical registers");
 
     if (DstSize > SrcSize && SrcRegBank.getID() == X86::GPRRegBankID &&
         DstRegBank.getID() == X86::GPRRegBankID) {
 
       const TargetRegisterClass *SrcRC =
           getRegClass(MRI.getType(SrcReg), SrcRegBank);
       const TargetRegisterClass *DstRC = getRegClassFromGRPhysReg(DstReg);
if (DstSize > SrcSize && SrcRegBank.getID() == X86::GPRRegBankID &&
 
         I.getOperand(1).setReg(ExtSrc);
       }
     }
 
     return true;
   }
 
-  assert((!Register::isPhysicalRegister(SrcReg) || I.isCopy()) &&
+  assert((!SrcReg.isPhysical() || I.isCopy()) &&
          "No phys reg on generic operators");
   assert((DstSize == SrcSize ||
           // Copies are a mean to setup initial types, the number of
           // bits may not exactly match.
-          (Register::isPhysicalRegister(SrcReg) &&
+          (SrcReg.isPhysical() &&
            DstSize <= RBI.getSizeInBits(SrcReg, MRI, TRI))) &&
          "Copy with different width?!");
 
   const TargetRegisterClass *DstRC =
       getRegClass(MRI.getType(DstReg), DstRegBank);
 
   if (SrcRegBank.getID() == X86::GPRRegBankID &&
       DstRegBank.getID() == X86::GPRRegBankID && SrcSize > DstSize &&
-      Register::isPhysicalRegister(SrcReg)) {
+      SrcReg.isPhysical()) {
     // Change the physical register to performe truncate.
 
     const TargetRegisterClass *SrcRC = getRegClassFromGRPhysReg(SrcReg);
 
     if (DstRC != SrcRC) {
       I.getOperand(1).setSubReg(getSubRegIndex(DstRC));
       I.getOperand(1).substPhysReg(SrcReg, TRI);
     }

llvm/lib/Target/X86/X86SpeculativeLoadHardening.cpp

private:
   tracePredStateThroughIndirectBranches(MachineFunction &MF);
 
   void tracePredStateThroughBlocksAndHarden(MachineFunction &MF);
 
   unsigned saveEFLAGS(MachineBasicBlock &MBB,
                       MachineBasicBlock::iterator InsertPt, DebugLoc Loc);
   void restoreEFLAGS(MachineBasicBlock &MBB,
                      MachineBasicBlock::iterator InsertPt, DebugLoc Loc,
-                     unsigned OFReg);
+                     Register Reg);
 
   void mergePredStateIntoSP(MachineBasicBlock &MBB,
                             MachineBasicBlock::iterator InsertPt, DebugLoc Loc,
                             unsigned PredStateReg);
   unsigned extractPredStateFromSP(MachineBasicBlock &MBB,
                                   MachineBasicBlock::iterator InsertPt,
                                   DebugLoc Loc);
 
   void
   hardenLoadAddr(MachineInstr &MI, MachineOperand &BaseMO,
                  MachineOperand &IndexMO,
                  SmallDenseMap<unsigned, unsigned, 32> &AddrRegToHardenedReg);
   MachineInstr *
   sinkPostLoadHardenedInst(MachineInstr &MI,
                            SmallPtrSetImpl<MachineInstr *> &HardenedInstrs);
-  bool canHardenRegister(unsigned Reg);
-  unsigned hardenValueInRegister(unsigned Reg, MachineBasicBlock &MBB,
+  bool canHardenRegister(Register Reg);
+  unsigned hardenValueInRegister(Register Reg, MachineBasicBlock &MBB,
                                  MachineBasicBlock::iterator InsertPt,
                                  DebugLoc Loc);
   unsigned hardenPostLoad(MachineInstr &MI);
   void hardenReturnInstr(MachineInstr &MI);
   void tracePredStateThroughCall(MachineInstr &MI);
   void hardenIndirectCallOrJumpInstr(
       MachineInstr &MI,
       SmallDenseMap<unsigned, unsigned, 32> &AddrRegToHardenedReg);

 
 /// Restore EFLAGS from the provided GPR. This should be produced by
 /// `saveEFLAGS`.
 ///
 /// This must be done within the same basic block as the save in order to
 /// reliably lower.
 void X86SpeculativeLoadHardeningPass::restoreEFLAGS(
     MachineBasicBlock &MBB, MachineBasicBlock::iterator InsertPt, DebugLoc Loc,
-    unsigned Reg) {
+    Register Reg) {
   BuildMI(MBB, InsertPt, Loc, TII->get(X86::COPY), X86::EFLAGS).addReg(Reg);
   ++NumInstsInserted;
 }
 
 /// Takes the current predicate state (in a register) and merges it into the
 /// stack pointer. The state is essentially a single bit, but we merge this in
 /// a way that won't form non-canonical pointers and also will be preserved
 /// across normal stack adjustments.
for (MachineInstr &UseMI : MRI->use_instructions(DefReg)) {
       // all of them.
       if (UseMI.getDesc().getNumDefs() > 1)
         return {};
 
       // If this register isn't a virtual register we can't walk uses of sanely,
       // just bail. Also check that its register class is one of the ones we
       // can harden.
       Register UseDefReg = UseMI.getOperand(0).getReg();
-      if (!Register::isVirtualRegister(UseDefReg) ||
-          !canHardenRegister(UseDefReg))
+      if (!UseDefReg.isVirtual() || !canHardenRegister(UseDefReg))
         return {};
 
       SingleUseMI = &UseMI;
     }
 
     // If SingleUseMI is still null, there is no use that needs its own
     // checking. Otherwise, it is the single use that needs checking.
     return {SingleUseMI};
   };
 
   MachineInstr *MI = &InitialMI;
   while (Optional<MachineInstr *> SingleUse = SinkCheckToSingleUse(*MI)) {
     // Update which MI we're checking now.
     MI = *SingleUse;
     if (!MI)
       break;
   }
 
   return MI;
 }
 
-bool X86SpeculativeLoadHardeningPass::canHardenRegister(unsigned Reg) {
+bool X86SpeculativeLoadHardeningPass::canHardenRegister(Register Reg) {
   auto *RC = MRI->getRegClass(Reg);
   int RegBytes = TRI->getRegSizeInBits(*RC) / 8;
   if (RegBytes > 8)
     // We don't support post-load hardening of vectors.
     return false;
 
   unsigned RegIdx = Log2_32(RegBytes);
   assert(RegIdx < 4 && "Unsupported register size");

 ///
 /// `Reg` must be a virtual register. Currently, it is required to be a GPR no
 /// larger than the predicate state register. FIXME: We should support vector
 /// registers here by broadcasting the predicate state.
 ///
 /// The new, hardened virtual register is returned. It will have the same
 /// register class as `Reg`.
 unsigned X86SpeculativeLoadHardeningPass::hardenValueInRegister(
-    unsigned Reg, MachineBasicBlock &MBB, MachineBasicBlock::iterator InsertPt,
+    Register Reg, MachineBasicBlock &MBB, MachineBasicBlock::iterator InsertPt,
     DebugLoc Loc) {
   assert(canHardenRegister(Reg) && "Cannot harden this register!");
-  assert(Register::isVirtualRegister(Reg) && "Cannot harden a physical register!");
+  assert(Reg.isVirtual() && "Cannot harden a physical register!");
 
   auto *RC = MRI->getRegClass(Reg);
   int Bytes = TRI->getRegSizeInBits(*RC) / 8;
 
   unsigned StateReg = PS->SSA.GetValueAtEndOfBlock(&MBB);
 
   // FIXME: Need to teach this about 32-bit mode.
   if (Bytes != 8) {