ARMAsmParser.cpp

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//===- ARMAsmParser.cpp - Parse ARM assembly to MCInst instructions -------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#include "ARMBaseInstrInfo.h"
#include "ARMFeatures.h"
#include "MCTargetDesc/ARMAddressingModes.h"
#include "MCTargetDesc/ARMBaseInfo.h"
#include "MCTargetDesc/ARMInstPrinter.h"
#include "MCTargetDesc/ARMMCExpr.h"
#include "MCTargetDesc/ARMMCTargetDesc.h"
#include "TargetInfo/ARMTargetInfo.h"
#include "Utils/ARMBaseInfo.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCParser/MCAsmLexer.h"
#include "llvm/MC/MCParser/MCAsmParser.h"
#include "llvm/MC/MCParser/MCAsmParserExtension.h"
#include "llvm/MC/MCParser/MCAsmParserUtils.h"
#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
#include "llvm/MC/MCParser/MCTargetAsmParser.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/SubtargetFeature.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/ARMBuildAttributes.h"
#include "llvm/Support/ARMEHABI.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/SMLoc.h"
#include "llvm/Support/TargetParser.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <iterator>
#include <limits>
#include <memory>
#include <string>
#include <utility>
#include <vector>
 
#define DEBUG_TYPE "asm-parser"
 
using namespace llvm;
 
namespace llvm {
extern const MCInstrDesc ARMInsts[];
} // end namespace llvm
 
namespace {
 
enum class ImplicitItModeTy { Always, Never, ARMOnly, ThumbOnly };
 
static cl::opt<ImplicitItModeTy> ImplicitItMode(
    "arm-implicit-it", cl::init(ImplicitItModeTy::ARMOnly),
    cl::desc("Allow conditional instructions outdside of an IT block"),
    cl::values(clEnumValN(ImplicitItModeTy::Always, "always",
                          "Accept in both ISAs, emit implicit ITs in Thumb"),
               clEnumValN(ImplicitItModeTy::Never, "never",
                          "Warn in ARM, reject in Thumb"),
               clEnumValN(ImplicitItModeTy::ARMOnly, "arm",
                          "Accept in ARM, reject in Thumb"),
               clEnumValN(ImplicitItModeTy::ThumbOnly, "thumb",
                          "Warn in ARM, emit implicit ITs in Thumb")));
 
static cl::opt<bool> AddBuildAttributes("arm-add-build-attributes",
                                        cl::init(false));
 
enum VectorLaneTy { NoLanes, AllLanes, IndexedLane };
 
static inline unsigned extractITMaskBit(unsigned Mask, unsigned Position) {
  // Position==0 means we're not in an IT block at all. Position==1
  // means we want the first state bit, which is always 0 (Then).
  // Position==2 means we want the second state bit, stored at bit 3
  // of Mask, and so on downwards. So (5 - Position) will shift the
  // right bit down to bit 0, including the always-0 bit at bit 4 for
  // the mandatory initial Then.
  return (Mask >> (5 - Position) & 1);
}
 
class UnwindContext {
  using Locs = SmallVector<SMLoc, 4>;
 
  MCAsmParser &Parser;
  Locs FnStartLocs;
  Locs CantUnwindLocs;
  Locs PersonalityLocs;
  Locs PersonalityIndexLocs;
  Locs HandlerDataLocs;
  int FPReg;
 
public:
  UnwindContext(MCAsmParser &P) : Parser(P), FPReg(ARM::SP) {}
 
  bool hasFnStart() const { return !FnStartLocs.empty(); }
  bool cantUnwind() const { return !CantUnwindLocs.empty(); }
  bool hasHandlerData() const { return !HandlerDataLocs.empty(); }
 
  bool hasPersonality() const {
    return !(PersonalityLocs.empty() && PersonalityIndexLocs.empty());
  }
 
  void recordFnStart(SMLoc L) { FnStartLocs.push_back(L); }
  void recordCantUnwind(SMLoc L) { CantUnwindLocs.push_back(L); }
  void recordPersonality(SMLoc L) { PersonalityLocs.push_back(L); }
  void recordHandlerData(SMLoc L) { HandlerDataLocs.push_back(L); }
  void recordPersonalityIndex(SMLoc L) { PersonalityIndexLocs.push_back(L); }
 
  void saveFPReg(int Reg) { FPReg = Reg; }
  int getFPReg() const { return FPReg; }
 
  void emitFnStartLocNotes() const {
    for (const SMLoc &Loc : FnStartLocs)
      Parser.Note(Loc, ".fnstart was specified here");
  }
 
  void emitCantUnwindLocNotes() const {
    for (const SMLoc &Loc : CantUnwindLocs)
      Parser.Note(Loc, ".cantunwind was specified here");
  }
 
  void emitHandlerDataLocNotes() const {
    for (const SMLoc &Loc : HandlerDataLocs)
      Parser.Note(Loc, ".handlerdata was specified here");
  }
 
  void emitPersonalityLocNotes() const {
    for (Locs::const_iterator PI = PersonalityLocs.begin(),
                              PE = PersonalityLocs.end(),
                              PII = PersonalityIndexLocs.begin(),
                              PIE = PersonalityIndexLocs.end();
         PI != PE || PII != PIE;) {
      if (PI != PE && (PII == PIE || PI->getPointer() < PII->getPointer()))
        Parser.Note(*PI++, ".personality was specified here");
      else if (PII != PIE && (PI == PE || PII->getPointer() < PI->getPointer()))
        Parser.Note(*PII++, ".personalityindex was specified here");
      else
        llvm_unreachable(".personality and .personalityindex cannot be "
                         "at the same location");
    }
  }
 
  void reset() {
    FnStartLocs = Locs();
    CantUnwindLocs = Locs();
    PersonalityLocs = Locs();
    HandlerDataLocs = Locs();
    PersonalityIndexLocs = Locs();
    FPReg = ARM::SP;
  }
};
 
// Various sets of ARM instruction mnemonics which are used by the asm parser
class ARMMnemonicSets {
  StringSet<> CDE;
  StringSet<> CDEWithVPTSuffix;
public:
  ARMMnemonicSets(const MCSubtargetInfo &STI);
 
  /// Returns true iff a given mnemonic is a CDE instruction
  bool isCDEInstr(StringRef Mnemonic) {
    // Quick check before searching the set
    if (!Mnemonic.startswith("cx") && !Mnemonic.startswith("vcx"))
      return false;
    return CDE.count(Mnemonic);
  }
 
  /// Returns true iff a given mnemonic is a VPT-predicable CDE instruction
  /// (possibly with a predication suffix "e" or "t")
  bool isVPTPredicableCDEInstr(StringRef Mnemonic) {
    if (!Mnemonic.startswith("vcx"))
      return false;
    return CDEWithVPTSuffix.count(Mnemonic);
  }
 
  /// Returns true iff a given mnemonic is an IT-predicable CDE instruction
  /// (possibly with a condition suffix)
  bool isITPredicableCDEInstr(StringRef Mnemonic) {
    if (!Mnemonic.startswith("cx"))
      return false;
    return Mnemonic.startswith("cx1a") || Mnemonic.startswith("cx1da") ||
           Mnemonic.startswith("cx2a") || Mnemonic.startswith("cx2da") ||
           Mnemonic.startswith("cx3a") || Mnemonic.startswith("cx3da");
  }
 
  /// Return true iff a given mnemonic is an integer CDE instruction with
  /// dual-register destination
  bool isCDEDualRegInstr(StringRef Mnemonic) {
    if (!Mnemonic.startswith("cx"))
      return false;
    return Mnemonic == "cx1d" || Mnemonic == "cx1da" ||
           Mnemonic == "cx2d" || Mnemonic == "cx2da" ||
           Mnemonic == "cx3d" || Mnemonic == "cx3da";
  }
};
 
ARMMnemonicSets::ARMMnemonicSets(const MCSubtargetInfo &STI) {
  for (StringRef Mnemonic: { "cx1", "cx1a", "cx1d", "cx1da",
                             "cx2", "cx2a", "cx2d", "cx2da",
                             "cx3", "cx3a", "cx3d", "cx3da", })
    CDE.insert(Mnemonic);
  for (StringRef Mnemonic :
       {"vcx1", "vcx1a", "vcx2", "vcx2a", "vcx3", "vcx3a"}) {
    CDE.insert(Mnemonic);
    CDEWithVPTSuffix.insert(Mnemonic);
    CDEWithVPTSuffix.insert(std::string(Mnemonic) + "t");
    CDEWithVPTSuffix.insert(std::string(Mnemonic) + "e");
  }
}
 
class ARMAsmParser : public MCTargetAsmParser {
  const MCRegisterInfo *MRI;
  UnwindContext UC;
  ARMMnemonicSets MS;
 
  ARMTargetStreamer &getTargetStreamer() {
    assert(getParser().getStreamer().getTargetStreamer() &&
           "do not have a target streamer");
    MCTargetStreamer &TS = *getParser().getStreamer().getTargetStreamer();
    return static_cast<ARMTargetStreamer &>(TS);
  }
 
  // Map of register aliases registers via the .req directive.
  StringMap<unsigned> RegisterReqs;
 
  bool NextSymbolIsThumb;
 
  bool useImplicitITThumb() const {
    return ImplicitItMode == ImplicitItModeTy::Always ||
           ImplicitItMode == ImplicitItModeTy::ThumbOnly;
  }
 
  bool useImplicitITARM() const {
    return ImplicitItMode == ImplicitItModeTy::Always ||
           ImplicitItMode == ImplicitItModeTy::ARMOnly;
  }
 
  struct {
    ARMCC::CondCodes Cond;    // Condition for IT block.
    unsigned Mask:4;          // Condition mask for instructions.
                              // Starting at first 1 (from lsb).
                              //   '1'  condition as indicated in IT.
                              //   '0'  inverse of condition (else).
                              // Count of instructions in IT block is
                              // 4 - trailingzeroes(mask)
                              // Note that this does not have the same encoding
                              // as in the IT instruction, which also depends
                              // on the low bit of the condition code.
 
    unsigned CurPosition;     // Current position in parsing of IT
                              // block. In range [0,4], with 0 being the IT
                              // instruction itself. Initialized according to
                              // count of instructions in block.  ~0U if no
                              // active IT block.
 
    bool IsExplicit;          // true  - The IT instruction was present in the
                              //         input, we should not modify it.
                              // false - The IT instruction was added
                              //         implicitly, we can extend it if that
                              //         would be legal.
  } ITState;
 
  SmallVector<MCInst, 4> PendingConditionalInsts;
 
  void flushPendingInstructions(MCStreamer &Out) override {
    if (!inImplicitITBlock()) {
      assert(PendingConditionalInsts.size() == 0);
      return;
    }
 
    // Emit the IT instruction
    MCInst ITInst;
    ITInst.setOpcode(ARM::t2IT);
    ITInst.addOperand(MCOperand::createImm(ITState.Cond));
    ITInst.addOperand(MCOperand::createImm(ITState.Mask));
    Out.emitInstruction(ITInst, getSTI());
 
    // Emit the conditonal instructions
    assert(PendingConditionalInsts.size() <= 4);
    for (const MCInst &Inst : PendingConditionalInsts) {
      Out.emitInstruction(Inst, getSTI());
    }
    PendingConditionalInsts.clear();
 
    // Clear the IT state
    ITState.Mask = 0;
    ITState.CurPosition = ~0U;
  }
 
  bool inITBlock() { return ITState.CurPosition != ~0U; }
  bool inExplicitITBlock() { return inITBlock() && ITState.IsExplicit; }
  bool inImplicitITBlock() { return inITBlock() && !ITState.IsExplicit; }
 
  bool lastInITBlock() {
    return ITState.CurPosition == 4 - countTrailingZeros(ITState.Mask);
  }
 
  void forwardITPosition() {
    if (!inITBlock()) return;
    // Move to the next instruction in the IT block, if there is one. If not,
    // mark the block as done, except for implicit IT blocks, which we leave
    // open until we find an instruction that can't be added to it.
    unsigned TZ = countTrailingZeros(ITState.Mask);
    if (++ITState.CurPosition == 5 - TZ && ITState.IsExplicit)
      ITState.CurPosition = ~0U; // Done with the IT block after this.
  }
 
  // Rewind the state of the current IT block, removing the last slot from it.
  void rewindImplicitITPosition() {
    assert(inImplicitITBlock());
    assert(ITState.CurPosition > 1);
    ITState.CurPosition--;
    unsigned TZ = countTrailingZeros(ITState.Mask);
    unsigned NewMask = 0;
    NewMask |= ITState.Mask & (0xC << TZ);
    NewMask |= 0x2 << TZ;
    ITState.Mask = NewMask;
  }
 
  // Rewind the state of the current IT block, removing the last slot from it.
  // If we were at the first slot, this closes the IT block.
  void discardImplicitITBlock() {
    assert(inImplicitITBlock());
    assert(ITState.CurPosition == 1);
    ITState.CurPosition = ~0U;
  }
 
  // Return the low-subreg of a given Q register.
  unsigned getDRegFromQReg(unsigned QReg) const {
    return MRI->getSubReg(QReg, ARM::dsub_0);
  }
 
  // Get the condition code corresponding to the current IT block slot.
  ARMCC::CondCodes currentITCond() {
    unsigned MaskBit = extractITMaskBit(ITState.Mask, ITState.CurPosition);
    return MaskBit ? ARMCC::getOppositeCondition(ITState.Cond) : ITState.Cond;
  }
 
  // Invert the condition of the current IT block slot without changing any
  // other slots in the same block.
  void invertCurrentITCondition() {
    if (ITState.CurPosition == 1) {
      ITState.Cond = ARMCC::getOppositeCondition(ITState.Cond);
    } else {
      ITState.Mask ^= 1 << (5 - ITState.CurPosition);
    }
  }
 
  // Returns true if the current IT block is full (all 4 slots used).
  bool isITBlockFull() {
    return inITBlock() && (ITState.Mask & 1);
  }
 
  // Extend the current implicit IT block to have one more slot with the given
  // condition code.
  void extendImplicitITBlock(ARMCC::CondCodes Cond) {
    assert(inImplicitITBlock());
    assert(!isITBlockFull());
    assert(Cond == ITState.Cond ||
           Cond == ARMCC::getOppositeCondition(ITState.Cond));
    unsigned TZ = countTrailingZeros(ITState.Mask);
    unsigned NewMask = 0;
    // Keep any existing condition bits.
    NewMask |= ITState.Mask & (0xE << TZ);
    // Insert the new condition bit.
    NewMask |= (Cond != ITState.Cond) << TZ;
    // Move the trailing 1 down one bit.
    NewMask |= 1 << (TZ - 1);
    ITState.Mask = NewMask;
  }
 
  // Create a new implicit IT block with a dummy condition code.
  void startImplicitITBlock() {
    assert(!inITBlock());
    ITState.Cond = ARMCC::AL;
    ITState.Mask = 8;
    ITState.CurPosition = 1;
    ITState.IsExplicit = false;
  }
 
  // Create a new explicit IT block with the given condition and mask.
  // The mask should be in the format used in ARMOperand and
  // MCOperand, with a 1 implying 'e', regardless of the low bit of
  // the condition.
  void startExplicitITBlock(ARMCC::CondCodes Cond, unsigned Mask) {
    assert(!inITBlock());
    ITState.Cond = Cond;
    ITState.Mask = Mask;
    ITState.CurPosition = 0;
    ITState.IsExplicit = true;
  }
 
  struct {
    unsigned Mask : 4;
    unsigned CurPosition;
  } VPTState;
  bool inVPTBlock() { return VPTState.CurPosition != ~0U; }
  void forwardVPTPosition() {
    if (!inVPTBlock()) return;
    unsigned TZ = countTrailingZeros(VPTState.Mask);
    if (++VPTState.CurPosition == 5 - TZ)
      VPTState.CurPosition = ~0U;
  }
 
  void Note(SMLoc L, const Twine &Msg, SMRange Range = None) {
    return getParser().Note(L, Msg, Range);
  }
 
  bool Warning(SMLoc L, const Twine &Msg, SMRange Range = None) {
    return getParser().Warning(L, Msg, Range);
  }
 
  bool Error(SMLoc L, const Twine &Msg, SMRange Range = None) {
    return getParser().Error(L, Msg, Range);
  }
 
  bool validatetLDMRegList(const MCInst &Inst, const OperandVector &Operands,
                           unsigned ListNo, bool IsARPop = false);
  bool validatetSTMRegList(const MCInst &Inst, const OperandVector &Operands,
                           unsigned ListNo);
 
  int tryParseRegister();
  bool tryParseRegisterWithWriteBack(OperandVector &);
  int tryParseShiftRegister(OperandVector &);
  bool parseRegisterList(OperandVector &, bool EnforceOrder = true,
                         bool AllowRAAC = false);
  bool parseMemory(OperandVector &);
  bool parseOperand(OperandVector &, StringRef Mnemonic);
  bool parsePrefix(ARMMCExpr::VariantKind &RefKind);
  bool parseMemRegOffsetShift(ARM_AM::ShiftOpc &ShiftType,
                              unsigned &ShiftAmount);
  bool parseLiteralValues(unsigned Size, SMLoc L);
  bool parseDirectiveThumb(SMLoc L);
  bool parseDirectiveARM(SMLoc L);
  bool parseDirectiveThumbFunc(SMLoc L);
  bool parseDirectiveCode(SMLoc L);
  bool parseDirectiveSyntax(SMLoc L);
  bool parseDirectiveReq(StringRef Name, SMLoc L);
  bool parseDirectiveUnreq(SMLoc L);
  bool parseDirectiveArch(SMLoc L);
  bool parseDirectiveEabiAttr(SMLoc L);
  bool parseDirectiveCPU(SMLoc L);
  bool parseDirectiveFPU(SMLoc L);
  bool parseDirectiveFnStart(SMLoc L);
  bool parseDirectiveFnEnd(SMLoc L);
  bool parseDirectiveCantUnwind(SMLoc L);
  bool parseDirectivePersonality(SMLoc L);
  bool parseDirectiveHandlerData(SMLoc L);
  bool parseDirectiveSetFP(SMLoc L);
  bool parseDirectivePad(SMLoc L);
  bool parseDirectiveRegSave(SMLoc L, bool IsVector);
  bool parseDirectiveInst(SMLoc L, char Suffix = '\0');
  bool parseDirectiveLtorg(SMLoc L);
  bool parseDirectiveEven(SMLoc L);
  bool parseDirectivePersonalityIndex(SMLoc L);
  bool parseDirectiveUnwindRaw(SMLoc L);
  bool parseDirectiveTLSDescSeq(SMLoc L);
  bool parseDirectiveMovSP(SMLoc L);
  bool parseDirectiveObjectArch(SMLoc L);
  bool parseDirectiveArchExtension(SMLoc L);
  bool parseDirectiveAlign(SMLoc L);
  bool parseDirectiveThumbSet(SMLoc L);
 
  bool isMnemonicVPTPredicable(StringRef Mnemonic, StringRef ExtraToken);
  StringRef splitMnemonic(StringRef Mnemonic, StringRef ExtraToken,
                          unsigned &PredicationCode,
                          unsigned &VPTPredicationCode, bool &CarrySetting,
                          unsigned &ProcessorIMod, StringRef &ITMask);
  void getMnemonicAcceptInfo(StringRef Mnemonic, StringRef ExtraToken,
                             StringRef FullInst, bool &CanAcceptCarrySet,
                             bool &CanAcceptPredicationCode,
                             bool &CanAcceptVPTPredicationCode);
  bool enableArchExtFeature(StringRef Name, SMLoc &ExtLoc);
 
  void tryConvertingToTwoOperandForm(StringRef Mnemonic, bool CarrySetting,
                                     OperandVector &Operands);
  bool CDEConvertDualRegOperand(StringRef Mnemonic, OperandVector &Operands);
 
  bool isThumb() const {
    // FIXME: Can tablegen auto-generate this?
    return getSTI().getFeatureBits()[ARM::ModeThumb];
  }
 
  bool isThumbOne() const {
    return isThumb() && !getSTI().getFeatureBits()[ARM::FeatureThumb2];
  }
 
  bool isThumbTwo() const {
    return isThumb() && getSTI().getFeatureBits()[ARM::FeatureThumb2];
  }
 
  bool hasThumb() const {
    return getSTI().getFeatureBits()[ARM::HasV4TOps];
  }
 
  bool hasThumb2() const {
    return getSTI().getFeatureBits()[ARM::FeatureThumb2];
  }
 
  bool hasV6Ops() const {
    return getSTI().getFeatureBits()[ARM::HasV6Ops];
  }
 
  bool hasV6T2Ops() const {
    return getSTI().getFeatureBits()[ARM::HasV6T2Ops];
  }
 
  bool hasV6MOps() const {
    return getSTI().getFeatureBits()[ARM::HasV6MOps];
  }
 
  bool hasV7Ops() const {
    return getSTI().getFeatureBits()[ARM::HasV7Ops];
  }
 
  bool hasV8Ops() const {
    return getSTI().getFeatureBits()[ARM::HasV8Ops];
  }
 
  bool hasV8MBaseline() const {
    return getSTI().getFeatureBits()[ARM::HasV8MBaselineOps];
  }
 
  bool hasV8MMainline() const {
    return getSTI().getFeatureBits()[ARM::HasV8MMainlineOps];
  }
  bool hasV8_1MMainline() const {
    return getSTI().getFeatureBits()[ARM::HasV8_1MMainlineOps];
  }
  bool hasMVE() const {
    return getSTI().getFeatureBits()[ARM::HasMVEIntegerOps];
  }
  bool hasMVEFloat() const {
    return getSTI().getFeatureBits()[ARM::HasMVEFloatOps];
  }
  bool hasCDE() const {
    return getSTI().getFeatureBits()[ARM::HasCDEOps];
  }
  bool has8MSecExt() const {
    return getSTI().getFeatureBits()[ARM::Feature8MSecExt];
  }
 
  bool hasARM() const {
    return !getSTI().getFeatureBits()[ARM::FeatureNoARM];
  }
 
  bool hasDSP() const {
    return getSTI().getFeatureBits()[ARM::FeatureDSP];
  }
 
  bool hasD32() const {
    return getSTI().getFeatureBits()[ARM::FeatureD32];
  }
 
  bool hasV8_1aOps() const {
    return getSTI().getFeatureBits()[ARM::HasV8_1aOps];
  }
 
  bool hasRAS() const {
    return getSTI().getFeatureBits()[ARM::FeatureRAS];
  }
 
  void SwitchMode() {
    MCSubtargetInfo &STI = copySTI();
    auto FB = ComputeAvailableFeatures(STI.ToggleFeature(ARM::ModeThumb));
    setAvailableFeatures(FB);
  }
 
  void FixModeAfterArchChange(bool WasThumb, SMLoc Loc);
 
  bool isMClass() const {
    return getSTI().getFeatureBits()[ARM::FeatureMClass];
  }
 
  /// @name Auto-generated Match Functions
  /// {
 
#define GET_ASSEMBLER_HEADER
#include "ARMGenAsmMatcher.inc"
 
  /// }
 
  OperandMatchResultTy parseITCondCode(OperandVector &);
  OperandMatchResultTy parseCoprocNumOperand(OperandVector &);
  OperandMatchResultTy parseCoprocRegOperand(OperandVector &);
  OperandMatchResultTy parseCoprocOptionOperand(OperandVector &);
  OperandMatchResultTy parseMemBarrierOptOperand(OperandVector &);
  OperandMatchResultTy parseTraceSyncBarrierOptOperand(OperandVector &);
  OperandMatchResultTy parseInstSyncBarrierOptOperand(OperandVector &);
  OperandMatchResultTy parseProcIFlagsOperand(OperandVector &);
  OperandMatchResultTy parseMSRMaskOperand(OperandVector &);
  OperandMatchResultTy parseBankedRegOperand(OperandVector &);
  OperandMatchResultTy parsePKHImm(OperandVector &O, StringRef Op, int Low,
                                   int High);
  OperandMatchResultTy parsePKHLSLImm(OperandVector &O) {
    return parsePKHImm(O, "lsl", 0, 31);
  }
  OperandMatchResultTy parsePKHASRImm(OperandVector &O) {
    return parsePKHImm(O, "asr", 1, 32);
  }
  OperandMatchResultTy parseSetEndImm(OperandVector &);
  OperandMatchResultTy parseShifterImm(OperandVector &);
  OperandMatchResultTy parseRotImm(OperandVector &);
  OperandMatchResultTy parseModImm(OperandVector &);
  OperandMatchResultTy parseBitfield(OperandVector &);
  OperandMatchResultTy parsePostIdxReg(OperandVector &);
  OperandMatchResultTy parseAM3Offset(OperandVector &);
  OperandMatchResultTy parseFPImm(OperandVector &);
  OperandMatchResultTy parseVectorList(OperandVector &);
  OperandMatchResultTy parseVectorLane(VectorLaneTy &LaneKind, unsigned &Index,
                                       SMLoc &EndLoc);
 
  // Asm Match Converter Methods
  void cvtThumbMultiply(MCInst &Inst, const OperandVector &);
  void cvtThumbBranches(MCInst &Inst, const OperandVector &);
  void cvtMVEVMOVQtoDReg(MCInst &Inst, const OperandVector &);
 
  bool validateInstruction(MCInst &Inst, const OperandVector &Ops);
  bool processInstruction(MCInst &Inst, const OperandVector &Ops, MCStreamer &Out);
  bool shouldOmitCCOutOperand(StringRef Mnemonic, OperandVector &Operands);
  bool shouldOmitPredicateOperand(StringRef Mnemonic, OperandVector &Operands);
  bool shouldOmitVectorPredicateOperand(StringRef Mnemonic, OperandVector &Operands);
  bool isITBlockTerminator(MCInst &Inst) const;
  void fixupGNULDRDAlias(StringRef Mnemonic, OperandVector &Operands);
  bool validateLDRDSTRD(MCInst &Inst, const OperandVector &Operands,
                        bool Load, bool ARMMode, bool Writeback);
 
public:
  enum ARMMatchResultTy {
    Match_RequiresITBlock = FIRST_TARGET_MATCH_RESULT_TY,
    Match_RequiresNotITBlock,
    Match_RequiresV6,
    Match_RequiresThumb2,
    Match_RequiresV8,
    Match_RequiresFlagSetting,
#define GET_OPERAND_DIAGNOSTIC_TYPES
#include "ARMGenAsmMatcher.inc"
 
  };
 
  ARMAsmParser(const MCSubtargetInfo &STI, MCAsmParser &Parser,
               const MCInstrInfo &MII, const MCTargetOptions &Options)
    : MCTargetAsmParser(Options, STI, MII), UC(Parser), MS(STI) {
    MCAsmParserExtension::Initialize(Parser);
 
    // Cache the MCRegisterInfo.
    MRI = getContext().getRegisterInfo();
 
    // Initialize the set of available features.
    setAvailableFeatures(ComputeAvailableFeatures(STI.getFeatureBits()));
 
    // Add build attributes based on the selected target.
    if (AddBuildAttributes)
      getTargetStreamer().emitTargetAttributes(STI);
 
    // Not in an ITBlock to start with.
    ITState.CurPosition = ~0U;
 
    VPTState.CurPosition = ~0U;
 
    NextSymbolIsThumb = false;
  }
 
  // Implementation of the MCTargetAsmParser interface:
  bool ParseRegister(unsigned &RegNo, SMLoc &StartLoc, SMLoc &EndLoc) override;
  OperandMatchResultTy tryParseRegister(unsigned &RegNo, SMLoc &StartLoc,
                                        SMLoc &EndLoc) override;
  bool ParseInstruction(ParseInstructionInfo &Info, StringRef Name,
                        SMLoc NameLoc, OperandVector &Operands) override;
  bool ParseDirective(AsmToken DirectiveID) override;
 
  unsigned validateTargetOperandClass(MCParsedAsmOperand &Op,
                                      unsigned Kind) override;
  unsigned checkTargetMatchPredicate(MCInst &Inst) override;
 
  bool MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
                               OperandVector &Operands, MCStreamer &Out,
                               uint64_t &ErrorInfo,
                               bool MatchingInlineAsm) override;
  unsigned MatchInstruction(OperandVector &Operands, MCInst &Inst,
                            SmallVectorImpl<NearMissInfo> &NearMisses,
                            bool MatchingInlineAsm, bool &EmitInITBlock,
                            MCStreamer &Out);
 
  struct NearMissMessage {
    SMLoc Loc;
    SmallString<128> Message;
  };
 
  const char *getCustomOperandDiag(ARMMatchResultTy MatchError);
 
  void FilterNearMisses(SmallVectorImpl<NearMissInfo> &NearMissesIn,
                        SmallVectorImpl<NearMissMessage> &NearMissesOut,
                        SMLoc IDLoc, OperandVector &Operands);
  void ReportNearMisses(SmallVectorImpl<NearMissInfo> &NearMisses, SMLoc IDLoc,
                        OperandVector &Operands);
 
  void doBeforeLabelEmit(MCSymbol *Symbol) override;
 
  void onLabelParsed(MCSymbol *Symbol) override;
};
 
/// ARMOperand - Instances of this class represent a parsed ARM machine
/// operand.
class ARMOperand : public MCParsedAsmOperand {
  enum KindTy {
    k_CondCode,
    k_VPTPred,
    k_CCOut,
    k_ITCondMask,
    k_CoprocNum,
    k_CoprocReg,
    k_CoprocOption,
    k_Immediate,
    k_MemBarrierOpt,
    k_InstSyncBarrierOpt,
    k_TraceSyncBarrierOpt,
    k_Memory,
    k_PostIndexRegister,
    k_MSRMask,
    k_BankedReg,
    k_ProcIFlags,
    k_VectorIndex,
    k_Register,
    k_RegisterList,
    k_RegisterListWithAPSR,
    k_DPRRegisterList,
    k_SPRRegisterList,
    k_FPSRegisterListWithVPR,
    k_FPDRegisterListWithVPR,
    k_VectorList,
    k_VectorListAllLanes,
    k_VectorListIndexed,
    k_ShiftedRegister,
    k_ShiftedImmediate,
    k_ShifterImmediate,
    k_RotateImmediate,
    k_ModifiedImmediate,
    k_ConstantPoolImmediate,
    k_BitfieldDescriptor,
    k_Token,
  } Kind;
 
  SMLoc StartLoc, EndLoc, AlignmentLoc;
  SmallVector<unsigned, 8> Registers;
 
  struct CCOp {
    ARMCC::CondCodes Val;
  };
 
  struct VCCOp {
    ARMVCC::VPTCodes Val;
  };
 
  struct CopOp {
    unsigned Val;
  };
 
  struct CoprocOptionOp {
    unsigned Val;
  };
 
  struct ITMaskOp {
    unsigned Mask:4;
  };
 
  struct MBOptOp {
    ARM_MB::MemBOpt Val;
  };
 
  struct ISBOptOp {
    ARM_ISB::InstSyncBOpt Val;
  };
 
  struct TSBOptOp {
    ARM_TSB::TraceSyncBOpt Val;
  };
 
  struct IFlagsOp {
    ARM_PROC::IFlags Val;
  };
 
  struct MMaskOp {
    unsigned Val;
  };
 
  struct BankedRegOp {
    unsigned Val;
  };
 
  struct TokOp {
    const char *Data;
    unsigned Length;
  };
 
  struct RegOp {
    unsigned RegNum;
  };
 
  // A vector register list is a sequential list of 1 to 4 registers.
  struct VectorListOp {
    unsigned RegNum;
    unsigned Count;
    unsigned LaneIndex;
    bool isDoubleSpaced;
  };
 
  struct VectorIndexOp {
    unsigned Val;
  };
 
  struct ImmOp {
    const MCExpr *Val;
  };
 
  /// Combined record for all forms of ARM address expressions.
  struct MemoryOp {
    unsigned BaseRegNum;
    // Offset is in OffsetReg or OffsetImm. If both are zero, no offset
    // was specified.
    const MCExpr *OffsetImm;  // Offset immediate value
    unsigned OffsetRegNum;    // Offset register num, when OffsetImm == NULL
    ARM_AM::ShiftOpc ShiftType; // Shift type for OffsetReg
    unsigned ShiftImm;        // shift for OffsetReg.
    unsigned Alignment;       // 0 = no alignment specified
    // n = alignment in bytes (2, 4, 8, 16, or 32)
    unsigned isNegative : 1;  // Negated OffsetReg? (~'U' bit)
  };
 
  struct PostIdxRegOp {
    unsigned RegNum;
    bool isAdd;
    ARM_AM::ShiftOpc ShiftTy;
    unsigned ShiftImm;
  };
 
  struct ShifterImmOp {
    bool isASR;
    unsigned Imm;
  };
 
  struct RegShiftedRegOp {
    ARM_AM::ShiftOpc ShiftTy;
    unsigned SrcReg;
    unsigned ShiftReg;
    unsigned ShiftImm;
  };
 
  struct RegShiftedImmOp {
    ARM_AM::ShiftOpc ShiftTy;
    unsigned SrcReg;
    unsigned ShiftImm;
  };
 
  struct RotImmOp {
    unsigned Imm;
  };
 
  struct ModImmOp {
    unsigned Bits;
    unsigned Rot;
  };
 
  struct BitfieldOp {
    unsigned LSB;
    unsigned Width;
  };
 
  union {
    struct CCOp CC;
    struct VCCOp VCC;
    struct CopOp Cop;
    struct CoprocOptionOp CoprocOption;
    struct MBOptOp MBOpt;
    struct ISBOptOp ISBOpt;
    struct TSBOptOp TSBOpt;
    struct ITMaskOp ITMask;
    struct IFlagsOp IFlags;
    struct MMaskOp MMask;
    struct BankedRegOp BankedReg;
    struct TokOp Tok;
    struct RegOp Reg;
    struct VectorListOp VectorList;
    struct VectorIndexOp VectorIndex;
    struct ImmOp Imm;
    struct MemoryOp Memory;
    struct PostIdxRegOp PostIdxReg;
    struct ShifterImmOp ShifterImm;
    struct RegShiftedRegOp RegShiftedReg;
    struct RegShiftedImmOp RegShiftedImm;
    struct RotImmOp RotImm;
    struct ModImmOp ModImm;
    struct BitfieldOp Bitfield;
  };
 
public:
  ARMOperand(KindTy K) : Kind(K) {}
 
  /// getStartLoc - Get the location of the first token of this operand.
  SMLoc getStartLoc() const override { return StartLoc; }
 
  /// getEndLoc - Get the location of the last token of this operand.
  SMLoc getEndLoc() const override { return EndLoc; }
 
  /// getLocRange - Get the range between the first and last token of this
  /// operand.
  SMRange getLocRange() const { return SMRange(StartLoc, EndLoc); }
 
  /// getAlignmentLoc - Get the location of the Alignment token of this operand.
  SMLoc getAlignmentLoc() const {
    assert(Kind == k_Memory && "Invalid access!");
    return AlignmentLoc;
  }
 
  ARMCC::CondCodes getCondCode() const {
    assert(Kind == k_CondCode && "Invalid access!");
    return CC.Val;
  }
 
  ARMVCC::VPTCodes getVPTPred() const {
    assert(isVPTPred() && "Invalid access!");
    return VCC.Val;
  }
 
  unsigned getCoproc() const {
    assert((Kind == k_CoprocNum || Kind == k_CoprocReg) && "Invalid access!");
    return Cop.Val;
  }
 
  StringRef getToken() const {
    assert(Kind == k_Token && "Invalid access!");
    return StringRef(Tok.Data, Tok.Length);
  }
 
  unsigned getReg() const override {
    assert((Kind == k_Register || Kind == k_CCOut) && "Invalid access!");
    return Reg.RegNum;
  }
 
  const SmallVectorImpl<unsigned> &getRegList() const {
    assert((Kind == k_RegisterList || Kind == k_RegisterListWithAPSR ||
            Kind == k_DPRRegisterList || Kind == k_SPRRegisterList ||
            Kind == k_FPSRegisterListWithVPR ||
            Kind == k_FPDRegisterListWithVPR) &&
           "Invalid access!");
    return Registers;
  }
 
  const MCExpr *getImm() const {
    assert(isImm() && "Invalid access!");
    return Imm.Val;
  }
 
  const MCExpr *getConstantPoolImm() const {
    assert(isConstantPoolImm() && "Invalid access!");
    return Imm.Val;
  }
 
  unsigned getVectorIndex() const {
    assert(Kind == k_VectorIndex && "Invalid access!");
    return VectorIndex.Val;
  }
 
  ARM_MB::MemBOpt getMemBarrierOpt() const {
    assert(Kind == k_MemBarrierOpt && "Invalid access!");
    return MBOpt.Val;
  }
 
  ARM_ISB::InstSyncBOpt getInstSyncBarrierOpt() const {
    assert(Kind == k_InstSyncBarrierOpt && "Invalid access!");
    return ISBOpt.Val;
  }
 
  ARM_TSB::TraceSyncBOpt getTraceSyncBarrierOpt() const {
    assert(Kind == k_TraceSyncBarrierOpt && "Invalid access!");
    return TSBOpt.Val;
  }
 
  ARM_PROC::IFlags getProcIFlags() const {
    assert(Kind == k_ProcIFlags && "Invalid access!");
    return IFlags.Val;
  }
 
  unsigned getMSRMask() const {
    assert(Kind == k_MSRMask && "Invalid access!");
    return MMask.Val;
  }
 
  unsigned getBankedReg() const {
    assert(Kind == k_BankedReg && "Invalid access!");
    return BankedReg.Val;
  }
 
  bool isCoprocNum() const { return Kind == k_CoprocNum; }
  bool isCoprocReg() const { return Kind == k_CoprocReg; }
  bool isCoprocOption() const { return Kind == k_CoprocOption; }
  bool isCondCode() const { return Kind == k_CondCode; }
  bool isVPTPred() const { return Kind == k_VPTPred; }
  bool isCCOut() const { return Kind == k_CCOut; }
  bool isITMask() const { return Kind == k_ITCondMask; }
  bool isITCondCode() const { return Kind == k_CondCode; }
  bool isImm() const override {
    return Kind == k_Immediate;
  }
 
  bool isARMBranchTarget() const {
    if (!isImm()) return false;
 
    if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm()))
      return CE->getValue() % 4 == 0;
    return true;
  }
 
 
  bool isThumbBranchTarget() const {
    if (!isImm()) return false;
 
    if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm()))
      return CE->getValue() % 2 == 0;
    return true;
  }
 
  // checks whether this operand is an unsigned offset which fits is a field
  // of specified width and scaled by a specific number of bits
  template<unsigned width, unsigned scale>
  bool isUnsignedOffset() const {
    if (!isImm()) return false;
    if (isa<MCSymbolRefExpr>(Imm.Val)) return true;
    if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Imm.Val)) {
      int64_t Val = CE->getValue();
      int64_t Align = 1LL << scale;
      int64_t Max = Align * ((1LL << width) - 1);
      return ((Val % Align) == 0) && (Val >= 0) && (Val <= Max);
    }
    return false;
  }
 
  // checks whether this operand is an signed offset which fits is a field
  // of specified width and scaled by a specific number of bits
  template<unsigned width, unsigned scale>
  bool isSignedOffset() const {
    if (!isImm()) return false;
    if (isa<MCSymbolRefExpr>(Imm.Val)) return true;
    if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Imm.Val)) {
      int64_t Val = CE->getValue();
      int64_t Align = 1LL << scale;
      int64_t Max = Align * ((1LL << (width-1)) - 1);
      int64_t Min = -Align * (1LL << (width-1));
      return ((Val % Align) == 0) && (Val >= Min) && (Val <= Max);
    }
    return false;
  }
 
  // checks whether this operand is an offset suitable for the LE /
  // LETP instructions in Arm v8.1M
  bool isLEOffset() const {
    if (!isImm()) return false;
    if (isa<MCSymbolRefExpr>(Imm.Val)) return true;
    if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Imm.Val)) {
      int64_t Val = CE->getValue();
      return Val < 0 && Val >= -4094 && (Val & 1) == 0;
    }
    return false;
  }
 
  // checks whether this operand is a memory operand computed as an offset
  // applied to PC. the offset may have 8 bits of magnitude and is represented
  // with two bits of shift. textually it may be either [pc, #imm], #imm or
  // relocable expression...
  bool isThumbMemPC() const {
    int64_t Val = 0;
    if (isImm()) {
      if (isa<MCSymbolRefExpr>(Imm.Val)) return true;
      const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Imm.Val);
      if (!CE) return false;
      Val = CE->getValue();
    }
    else if (isGPRMem()) {
      if(!Memory.OffsetImm || Memory.OffsetRegNum) return false;
      if(Memory.BaseRegNum != ARM::PC) return false;
      if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm))
        Val = CE->getValue();
      else
        return false;
    }
    else return false;
    return ((Val % 4) == 0) && (Val >= 0) && (Val <= 1020);
  }
 
  bool isFPImm() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int Val = ARM_AM::getFP32Imm(APInt(32, CE->getValue()));
    return Val != -1;
  }
 
  template<int64_t N, int64_t M>
  bool isImmediate() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Value = CE->getValue();
    return Value >= N && Value <= M;
  }
 
  template<int64_t N, int64_t M>
  bool isImmediateS4() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Value = CE->getValue();
    return ((Value & 3) == 0) && Value >= N && Value <= M;
  }
  template<int64_t N, int64_t M>
  bool isImmediateS2() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Value = CE->getValue();
    return ((Value & 1) == 0) && Value >= N && Value <= M;
  }
  bool isFBits16() const {
    return isImmediate<0, 17>();
  }
  bool isFBits32() const {
    return isImmediate<1, 33>();
  }
  bool isImm8s4() const {
    return isImmediateS4<-1020, 1020>();
  }
  bool isImm7s4() const {
    return isImmediateS4<-508, 508>();
  }
  bool isImm7Shift0() const {
    return isImmediate<-127, 127>();
  }
  bool isImm7Shift1() const {
    return isImmediateS2<-255, 255>();
  }
  bool isImm7Shift2() const {
    return isImmediateS4<-511, 511>();
  }
  bool isImm7() const {
    return isImmediate<-127, 127>();
  }
  bool isImm0_1020s4() const {
    return isImmediateS4<0, 1020>();
  }
  bool isImm0_508s4() const {
    return isImmediateS4<0, 508>();
  }
  bool isImm0_508s4Neg() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Value = -CE->getValue();
    // explicitly exclude zero. we want that to use the normal 0_508 version.
    return ((Value & 3) == 0) && Value > 0 && Value <= 508;
  }
 
  bool isImm0_4095Neg() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    // isImm0_4095Neg is used with 32-bit immediates only.
    // 32-bit immediates are zero extended to 64-bit when parsed,
    // thus simple -CE->getValue() results in a big negative number,
    // not a small positive number as intended
    if ((CE->getValue() >> 32) > 0) return false;
    uint32_t Value = -static_cast<uint32_t>(CE->getValue());
    return Value > 0 && Value < 4096;
  }
 
  bool isImm0_7() const {
    return isImmediate<0, 7>();
  }
 
  bool isImm1_16() const {
    return isImmediate<1, 16>();
  }
 
  bool isImm1_32() const {
    return isImmediate<1, 32>();
  }
 
  bool isImm8_255() const {
    return isImmediate<8, 255>();
  }
 
  bool isImm256_65535Expr() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    // If it's not a constant expression, it'll generate a fixup and be
    // handled later.
    if (!CE) return true;
    int64_t Value = CE->getValue();
    return Value >= 256 && Value < 65536;
  }
 
  bool isImm0_65535Expr() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    // If it's not a constant expression, it'll generate a fixup and be
    // handled later.
    if (!CE) return true;
    int64_t Value = CE->getValue();
    return Value >= 0 && Value < 65536;
  }
 
  bool isImm24bit() const {
    return isImmediate<0, 0xffffff + 1>();
  }
 
  bool isImmThumbSR() const {
    return isImmediate<1, 33>();
  }
 
  template<int shift>
  bool isExpImmValue(uint64_t Value) const {
    uint64_t mask = (1 << shift) - 1;
    if ((Value & mask) != 0 || (Value >> shift) > 0xff)
      return false;
    return true;
  }
 
  template<int shift>
  bool isExpImm() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
 
    return isExpImmValue<shift>(CE->getValue());
  }
 
  template<int shift, int size>
  bool isInvertedExpImm() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
 
    uint64_t OriginalValue = CE->getValue();
    uint64_t InvertedValue = OriginalValue ^ (((uint64_t)1 << size) - 1);
    return isExpImmValue<shift>(InvertedValue);
  }
 
  bool isPKHLSLImm() const {
    return isImmediate<0, 32>();
  }
 
  bool isPKHASRImm() const {
    return isImmediate<0, 33>();
  }
 
  bool isAdrLabel() const {
    // If we have an immediate that's not a constant, treat it as a label
    // reference needing a fixup.
    if (isImm() && !isa<MCConstantExpr>(getImm()))
      return true;
 
    // If it is a constant, it must fit into a modified immediate encoding.
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Value = CE->getValue();
    return (ARM_AM::getSOImmVal(Value) != -1 ||
            ARM_AM::getSOImmVal(-Value) != -1);
  }
 
  bool isT2SOImm() const {
    // If we have an immediate that's not a constant, treat it as an expression
    // needing a fixup.
    if (isImm() && !isa<MCConstantExpr>(getImm())) {
      // We want to avoid matching :upper16: and :lower16: as we want these
      // expressions to match in isImm0_65535Expr()
      const ARMMCExpr *ARM16Expr = dyn_cast<ARMMCExpr>(getImm());
      return (!ARM16Expr || (ARM16Expr->getKind() != ARMMCExpr::VK_ARM_HI16 &&
                             ARM16Expr->getKind() != ARMMCExpr::VK_ARM_LO16));
    }
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Value = CE->getValue();
    return ARM_AM::getT2SOImmVal(Value) != -1;
  }
 
  bool isT2SOImmNot() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Value = CE->getValue();
    return ARM_AM::getT2SOImmVal(Value) == -1 &&
      ARM_AM::getT2SOImmVal(~Value) != -1;
  }
 
  bool isT2SOImmNeg() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Value = CE->getValue();
    // Only use this when not representable as a plain so_imm.
    return ARM_AM::getT2SOImmVal(Value) == -1 &&
      ARM_AM::getT2SOImmVal(-Value) != -1;
  }
 
  bool isSetEndImm() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Value = CE->getValue();
    return Value == 1 || Value == 0;
  }
 
  bool isReg() const override { return Kind == k_Register; }
  bool isRegList() const { return Kind == k_RegisterList; }
  bool isRegListWithAPSR() const {
    return Kind == k_RegisterListWithAPSR || Kind == k_RegisterList;
  }
  bool isDPRRegList() const { return Kind == k_DPRRegisterList; }
  bool isSPRRegList() const { return Kind == k_SPRRegisterList; }
  bool isFPSRegListWithVPR() const { return Kind == k_FPSRegisterListWithVPR; }
  bool isFPDRegListWithVPR() const { return Kind == k_FPDRegisterListWithVPR; }
  bool isToken() const override { return Kind == k_Token; }
  bool isMemBarrierOpt() const { return Kind == k_MemBarrierOpt; }
  bool isInstSyncBarrierOpt() const { return Kind == k_InstSyncBarrierOpt; }
  bool isTraceSyncBarrierOpt() const { return Kind == k_TraceSyncBarrierOpt; }
  bool isMem() const override {
      return isGPRMem() || isMVEMem();
  }
  bool isMVEMem() const {
    if (Kind != k_Memory)
      return false;
    if (Memory.BaseRegNum &&
        !ARMMCRegisterClasses[ARM::GPRRegClassID].contains(Memory.BaseRegNum) &&
        !ARMMCRegisterClasses[ARM::MQPRRegClassID].contains(Memory.BaseRegNum))
      return false;
    if (Memory.OffsetRegNum &&
        !ARMMCRegisterClasses[ARM::MQPRRegClassID].contains(
            Memory.OffsetRegNum))
      return false;
    return true;
  }
  bool isGPRMem() const {
    if (Kind != k_Memory)
      return false;
    if (Memory.BaseRegNum &&
        !ARMMCRegisterClasses[ARM::GPRRegClassID].contains(Memory.BaseRegNum))
      return false;
    if (Memory.OffsetRegNum &&
        !ARMMCRegisterClasses[ARM::GPRRegClassID].contains(Memory.OffsetRegNum))
      return false;
    return true;
  }
  bool isShifterImm() const { return Kind == k_ShifterImmediate; }
  bool isRegShiftedReg() const {
    return Kind == k_ShiftedRegister &&
           ARMMCRegisterClasses[ARM::GPRRegClassID].contains(
               RegShiftedReg.SrcReg) &&
           ARMMCRegisterClasses[ARM::GPRRegClassID].contains(
               RegShiftedReg.ShiftReg);
  }
  bool isRegShiftedImm() const {
    return Kind == k_ShiftedImmediate &&
           ARMMCRegisterClasses[ARM::GPRRegClassID].contains(
               RegShiftedImm.SrcReg);
  }
  bool isRotImm() const { return Kind == k_RotateImmediate; }
 
  template<unsigned Min, unsigned Max>
  bool isPowerTwoInRange() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Value = CE->getValue();
    return Value > 0 && countPopulation((uint64_t)Value) == 1 &&
           Value >= Min && Value <= Max;
  }
  bool isModImm() const { return Kind == k_ModifiedImmediate; }
 
  bool isModImmNot() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Value = CE->getValue();
    return ARM_AM::getSOImmVal(~Value) != -1;
  }
 
  bool isModImmNeg() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Value = CE->getValue();
    return ARM_AM::getSOImmVal(Value) == -1 &&
      ARM_AM::getSOImmVal(-Value) != -1;
  }
 
  bool isThumbModImmNeg1_7() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int32_t Value = -(int32_t)CE->getValue();
    return 0 < Value && Value < 8;
  }
 
  bool isThumbModImmNeg8_255() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int32_t Value = -(int32_t)CE->getValue();
    return 7 < Value && Value < 256;
  }
 
  bool isConstantPoolImm() const { return Kind == k_ConstantPoolImmediate; }
  bool isBitfield() const { return Kind == k_BitfieldDescriptor; }
  bool isPostIdxRegShifted() const {
    return Kind == k_PostIndexRegister &&
           ARMMCRegisterClasses[ARM::GPRRegClassID].contains(PostIdxReg.RegNum);
  }
  bool isPostIdxReg() const {
    return isPostIdxRegShifted() && PostIdxReg.ShiftTy == ARM_AM::no_shift;
  }
  bool isMemNoOffset(bool alignOK = false, unsigned Alignment = 0) const {
    if (!isGPRMem())
      return false;
    // No offset of any kind.
    return Memory.OffsetRegNum == 0 && Memory.OffsetImm == nullptr &&
     (alignOK || Memory.Alignment == Alignment);
  }
  bool isMemNoOffsetT2(bool alignOK = false, unsigned Alignment = 0) const {
    if (!isGPRMem())
      return false;
 
    if (!ARMMCRegisterClasses[ARM::GPRnopcRegClassID].contains(
            Memory.BaseRegNum))
      return false;
 
    // No offset of any kind.
    return Memory.OffsetRegNum == 0 && Memory.OffsetImm == nullptr &&
     (alignOK || Memory.Alignment == Alignment);
  }
  bool isMemNoOffsetT2NoSp(bool alignOK = false, unsigned Alignment = 0) const {
    if (!isGPRMem())
      return false;
 
    if (!ARMMCRegisterClasses[ARM::rGPRRegClassID].contains(
            Memory.BaseRegNum))
      return false;
 
    // No offset of any kind.
    return Memory.OffsetRegNum == 0 && Memory.OffsetImm == nullptr &&
     (alignOK || Memory.Alignment == Alignment);
  }
  bool isMemNoOffsetT(bool alignOK = false, unsigned Alignment = 0) const {
    if (!isGPRMem())
      return false;
 
    if (!ARMMCRegisterClasses[ARM::tGPRRegClassID].contains(
            Memory.BaseRegNum))
      return false;
 
    // No offset of any kind.
    return Memory.OffsetRegNum == 0 && Memory.OffsetImm == nullptr &&
     (alignOK || Memory.Alignment == Alignment);
  }
  bool isMemPCRelImm12() const {
    if (!isGPRMem() || Memory.OffsetRegNum != 0 || Memory.Alignment != 0)
      return false;
    // Base register must be PC.
    if (Memory.BaseRegNum != ARM::PC)
      return false;
    // Immediate offset in range [-4095, 4095].
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      return (Val > -4096 && Val < 4096) ||
             (Val == std::numeric_limits<int32_t>::min());
    }
    return false;
  }
 
  bool isAlignedMemory() const {
    return isMemNoOffset(true);
  }
 
  bool isAlignedMemoryNone() const {
    return isMemNoOffset(false, 0);
  }
 
  bool isDupAlignedMemoryNone() const {
    return isMemNoOffset(false, 0);
  }
 
  bool isAlignedMemory16() const {
    if (isMemNoOffset(false, 2)) // alignment in bytes for 16-bits is 2.
      return true;
    return isMemNoOffset(false, 0);
  }
 
  bool isDupAlignedMemory16() const {
    if (isMemNoOffset(false, 2)) // alignment in bytes for 16-bits is 2.
      return true;
    return isMemNoOffset(false, 0);
  }
 
  bool isAlignedMemory32() const {
    if (isMemNoOffset(false, 4)) // alignment in bytes for 32-bits is 4.
      return true;
    return isMemNoOffset(false, 0);
  }
 
  bool isDupAlignedMemory32() const {
    if (isMemNoOffset(false, 4)) // alignment in bytes for 32-bits is 4.
      return true;
    return isMemNoOffset(false, 0);
  }
 
  bool isAlignedMemory64() const {
    if (isMemNoOffset(false, 8)) // alignment in bytes for 64-bits is 8.
      return true;
    return isMemNoOffset(false, 0);
  }
 
  bool isDupAlignedMemory64() const {
    if (isMemNoOffset(false, 8)) // alignment in bytes for 64-bits is 8.
      return true;
    return isMemNoOffset(false, 0);
  }
 
  bool isAlignedMemory64or128() const {
    if (isMemNoOffset(false, 8)) // alignment in bytes for 64-bits is 8.
      return true;
    if (isMemNoOffset(false, 16)) // alignment in bytes for 128-bits is 16.
      return true;
    return isMemNoOffset(false, 0);
  }
 
  bool isDupAlignedMemory64or128() const {
    if (isMemNoOffset(false, 8)) // alignment in bytes for 64-bits is 8.
      return true;
    if (isMemNoOffset(false, 16)) // alignment in bytes for 128-bits is 16.
      return true;
    return isMemNoOffset(false, 0);
  }
 
  bool isAlignedMemory64or128or256() const {
    if (isMemNoOffset(false, 8)) // alignment in bytes for 64-bits is 8.
      return true;
    if (isMemNoOffset(false, 16)) // alignment in bytes for 128-bits is 16.
      return true;
    if (isMemNoOffset(false, 32)) // alignment in bytes for 256-bits is 32.
      return true;
    return isMemNoOffset(false, 0);
  }
 
  bool isAddrMode2() const {
    if (!isGPRMem() || Memory.Alignment != 0) return false;
    // Check for register offset.
    if (Memory.OffsetRegNum) return true;
    // Immediate offset in range [-4095, 4095].
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      return Val > -4096 && Val < 4096;
    }
    return false;
  }
 
  bool isAM2OffsetImm() const {
    if (!isImm()) return false;
    // Immediate offset in range [-4095, 4095].
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Val = CE->getValue();
    return (Val == std::numeric_limits<int32_t>::min()) ||
           (Val > -4096 && Val < 4096);
  }
 
  bool isAddrMode3() const {
    // If we have an immediate that's not a constant, treat it as a label
    // reference needing a fixup. If it is a constant, it's something else
    // and we reject it.
    if (isImm() && !isa<MCConstantExpr>(getImm()))
      return true;
    if (!isGPRMem() || Memory.Alignment != 0) return false;
    // No shifts are legal for AM3.
    if (Memory.ShiftType != ARM_AM::no_shift) return false;
    // Check for register offset.
    if (Memory.OffsetRegNum) return true;
    // Immediate offset in range [-255, 255].
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      // The #-0 offset is encoded as std::numeric_limits<int32_t>::min(), and
      // we have to check for this too.
      return (Val > -256 && Val < 256) ||
             Val == std::numeric_limits<int32_t>::min();
    }
    return false;
  }
 
  bool isAM3Offset() const {
    if (isPostIdxReg())
      return true;
    if (!isImm())
      return false;
    // Immediate offset in range [-255, 255].
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Val = CE->getValue();
    // Special case, #-0 is std::numeric_limits<int32_t>::min().
    return (Val > -256 && Val < 256) ||
           Val == std::numeric_limits<int32_t>::min();
  }
 
  bool isAddrMode5() const {
    // If we have an immediate that's not a constant, treat it as a label
    // reference needing a fixup. If it is a constant, it's something else
    // and we reject it.
    if (isImm() && !isa<MCConstantExpr>(getImm()))
      return true;
    if (!isGPRMem() || Memory.Alignment != 0) return false;
    // Check for register offset.
    if (Memory.OffsetRegNum) return false;
    // Immediate offset in range [-1020, 1020] and a multiple of 4.
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      return (Val >= -1020 && Val <= 1020 && ((Val & 3) == 0)) ||
             Val == std::numeric_limits<int32_t>::min();
    }
    return false;
  }
 
  bool isAddrMode5FP16() const {
    // If we have an immediate that's not a constant, treat it as a label
    // reference needing a fixup. If it is a constant, it's something else
    // and we reject it.
    if (isImm() && !isa<MCConstantExpr>(getImm()))
      return true;
    if (!isGPRMem() || Memory.Alignment != 0) return false;
    // Check for register offset.
    if (Memory.OffsetRegNum) return false;
    // Immediate offset in range [-510, 510] and a multiple of 2.
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      return (Val >= -510 && Val <= 510 && ((Val & 1) == 0)) ||
             Val == std::numeric_limits<int32_t>::min();
    }
    return false;
  }
 
  bool isMemTBB() const {
    if (!isGPRMem() || !Memory.OffsetRegNum || Memory.isNegative ||
        Memory.ShiftType != ARM_AM::no_shift || Memory.Alignment != 0)
      return false;
    return true;
  }
 
  bool isMemTBH() const {
    if (!isGPRMem() || !Memory.OffsetRegNum || Memory.isNegative ||
        Memory.ShiftType != ARM_AM::lsl || Memory.ShiftImm != 1 ||
        Memory.Alignment != 0 )
      return false;
    return true;
  }
 
  bool isMemRegOffset() const {
    if (!isGPRMem() || !Memory.OffsetRegNum || Memory.Alignment != 0)
      return false;
    return true;
  }
 
  bool isT2MemRegOffset() const {
    if (!isGPRMem() || !Memory.OffsetRegNum || Memory.isNegative ||
        Memory.Alignment != 0 || Memory.BaseRegNum == ARM::PC)
      return false;
    // Only lsl #{0, 1, 2, 3} allowed.
    if (Memory.ShiftType == ARM_AM::no_shift)
      return true;
    if (Memory.ShiftType != ARM_AM::lsl || Memory.ShiftImm > 3)
      return false;
    return true;
  }
 
  bool isMemThumbRR() const {
    // Thumb reg+reg addressing is simple. Just two registers, a base and
    // an offset. No shifts, negations or any other complicating factors.
    if (!isGPRMem() || !Memory.OffsetRegNum || Memory.isNegative ||
        Memory.ShiftType != ARM_AM::no_shift || Memory.Alignment != 0)
      return false;
    return isARMLowRegister(Memory.BaseRegNum) &&
      (!Memory.OffsetRegNum || isARMLowRegister(Memory.OffsetRegNum));
  }
 
  bool isMemThumbRIs4() const {
    if (!isGPRMem() || Memory.OffsetRegNum != 0 ||
        !isARMLowRegister(Memory.BaseRegNum) || Memory.Alignment != 0)
      return false;
    // Immediate offset, multiple of 4 in range [0, 124].
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      return Val >= 0 && Val <= 124 && (Val % 4) == 0;
    }
    return false;
  }
 
  bool isMemThumbRIs2() const {
    if (!isGPRMem() || Memory.OffsetRegNum != 0 ||
        !isARMLowRegister(Memory.BaseRegNum) || Memory.Alignment != 0)
      return false;
    // Immediate offset, multiple of 4 in range [0, 62].
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      return Val >= 0 && Val <= 62 && (Val % 2) == 0;
    }
    return false;
  }
 
  bool isMemThumbRIs1() const {
    if (!isGPRMem() || Memory.OffsetRegNum != 0 ||
        !isARMLowRegister(Memory.BaseRegNum) || Memory.Alignment != 0)
      return false;
    // Immediate offset in range [0, 31].
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      return Val >= 0 && Val <= 31;
    }
    return false;
  }
 
  bool isMemThumbSPI() const {
    if (!isGPRMem() || Memory.OffsetRegNum != 0 ||
        Memory.BaseRegNum != ARM::SP || Memory.Alignment != 0)
      return false;
    // Immediate offset, multiple of 4 in range [0, 1020].
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      return Val >= 0 && Val <= 1020 && (Val % 4) == 0;
    }
    return false;
  }
 
  bool isMemImm8s4Offset() const {
    // If we have an immediate that's not a constant, treat it as a label
    // reference needing a fixup. If it is a constant, it's something else
    // and we reject it.
    if (isImm() && !isa<MCConstantExpr>(getImm()))
      return true;
    if (!isGPRMem() || Memory.OffsetRegNum != 0 || Memory.Alignment != 0)
      return false;
    // Immediate offset a multiple of 4 in range [-1020, 1020].
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      // Special case, #-0 is std::numeric_limits<int32_t>::min().
      return (Val >= -1020 && Val <= 1020 && (Val & 3) == 0) ||
             Val == std::numeric_limits<int32_t>::min();
    }
    return false;
  }
 
  bool isMemImm7s4Offset() const {
    // If we have an immediate that's not a constant, treat it as a label
    // reference needing a fixup. If it is a constant, it's something else
    // and we reject it.
    if (isImm() && !isa<MCConstantExpr>(getImm()))
      return true;
    if (!isGPRMem() || Memory.OffsetRegNum != 0 || Memory.Alignment != 0 ||
        !ARMMCRegisterClasses[ARM::GPRnopcRegClassID].contains(
            Memory.BaseRegNum))
      return false;
    // Immediate offset a multiple of 4 in range [-508, 508].
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      // Special case, #-0 is INT32_MIN.
      return (Val >= -508 && Val <= 508 && (Val & 3) == 0) || Val == INT32_MIN;
    }
    return false;
  }
 
  bool isMemImm0_1020s4Offset() const {
    if (!isGPRMem() || Memory.OffsetRegNum != 0 || Memory.Alignment != 0)
      return false;
    // Immediate offset a multiple of 4 in range [0, 1020].
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      return Val >= 0 && Val <= 1020 && (Val & 3) == 0;
    }
    return false;
  }
 
  bool isMemImm8Offset() const {
    if (!isGPRMem() || Memory.OffsetRegNum != 0 || Memory.Alignment != 0)
      return false;
    // Base reg of PC isn't allowed for these encodings.
    if (Memory.BaseRegNum == ARM::PC) return false;
    // Immediate offset in range [-255, 255].
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      return (Val == std::numeric_limits<int32_t>::min()) ||
             (Val > -256 && Val < 256);
    }
    return false;
  }
 
  template<unsigned Bits, unsigned RegClassID>
  bool isMemImm7ShiftedOffset() const {
    if (!isGPRMem() || Memory.OffsetRegNum != 0 || Memory.Alignment != 0 ||
        !ARMMCRegisterClasses[RegClassID].contains(Memory.BaseRegNum))
      return false;
 
    // Expect an immediate offset equal to an element of the range
    // [-127, 127], shifted left by Bits.
 
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
 
      // INT32_MIN is a special-case value (indicating the encoding with
      // zero offset and the subtract bit set)
      if (Val == INT32_MIN)
        return true;
 
      unsigned Divisor = 1U << Bits;
 
      // Check that the low bits are zero
      if (Val % Divisor != 0)
        return false;
 
      // Check that the remaining offset is within range.
      Val /= Divisor;
      return (Val >= -127 && Val <= 127);
    }
    return false;
  }
 
  template <int shift> bool isMemRegRQOffset() const {
    if (!isMVEMem() || Memory.OffsetImm != nullptr || Memory.Alignment != 0)
      return false;
 
    if (!ARMMCRegisterClasses[ARM::GPRnopcRegClassID].contains(
            Memory.BaseRegNum))
      return false;
    if (!ARMMCRegisterClasses[ARM::MQPRRegClassID].contains(
            Memory.OffsetRegNum))
      return false;
 
    if (shift == 0 && Memory.ShiftType != ARM_AM::no_shift)
      return false;
 
    if (shift > 0 &&
        (Memory.ShiftType != ARM_AM::uxtw || Memory.ShiftImm != shift))
      return false;
 
    return true;
  }
 
  template <int shift> bool isMemRegQOffset() const {
    if (!isMVEMem() || Memory.OffsetRegNum != 0 || Memory.Alignment != 0)
      return false;
 
    if (!ARMMCRegisterClasses[ARM::MQPRRegClassID].contains(
            Memory.BaseRegNum))
      return false;
 
    if (!Memory.OffsetImm)
      return true;
    static_assert(shift < 56,
                  "Such that we dont shift by a value higher than 62");
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
 
      // The value must be a multiple of (1 << shift)
      if ((Val & ((1U << shift) - 1)) != 0)
        return false;
 
      // And be in the right range, depending on the amount that it is shifted
      // by.  Shift 0, is equal to 7 unsigned bits, the sign bit is set
      // separately.
      int64_t Range = (1U << (7 + shift)) - 1;
      return (Val == INT32_MIN) || (Val > -Range && Val < Range);
    }
    return false;
  }
 
  bool isMemPosImm8Offset() const {
    if (!isGPRMem() || Memory.OffsetRegNum != 0 || Memory.Alignment != 0)
      return false;
    // Immediate offset in range [0, 255].
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      return Val >= 0 && Val < 256;
    }
    return false;
  }
 
  bool isMemNegImm8Offset() const {
    if (!isGPRMem() || Memory.OffsetRegNum != 0 || Memory.Alignment != 0)
      return false;
    // Base reg of PC isn't allowed for these encodings.
    if (Memory.BaseRegNum == ARM::PC) return false;
    // Immediate offset in range [-255, -1].
    if (!Memory.OffsetImm) return false;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      return (Val == std::numeric_limits<int32_t>::min()) ||
             (Val > -256 && Val < 0);
    }
    return false;
  }
 
  bool isMemUImm12Offset() const {
    if (!isGPRMem() || Memory.OffsetRegNum != 0 || Memory.Alignment != 0)
      return false;
    // Immediate offset in range [0, 4095].
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      return (Val >= 0 && Val < 4096);
    }
    return false;
  }
 
  bool isMemImm12Offset() const {
    // If we have an immediate that's not a constant, treat it as a label
    // reference needing a fixup. If it is a constant, it's something else
    // and we reject it.
 
    if (isImm() && !isa<MCConstantExpr>(getImm()))
      return true;
 
    if (!isGPRMem() || Memory.OffsetRegNum != 0 || Memory.Alignment != 0)
      return false;
    // Immediate offset in range [-4095, 4095].
    if (!Memory.OffsetImm) return true;
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int64_t Val = CE->getValue();
      return (Val > -4096 && Val < 4096) ||
             (Val == std::numeric_limits<int32_t>::min());
    }
    // If we have an immediate that's not a constant, treat it as a
    // symbolic expression needing a fixup.
    return true;
  }
 
  bool isConstPoolAsmImm() const {
    // Delay processing of Constant Pool Immediate, this will turn into
    // a constant. Match no other operand
    return (isConstantPoolImm());
  }
 
  bool isPostIdxImm8() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Val = CE->getValue();
    return (Val > -256 && Val < 256) ||
           (Val == std::numeric_limits<int32_t>::min());
  }
 
  bool isPostIdxImm8s4() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    int64_t Val = CE->getValue();
    return ((Val & 3) == 0 && Val >= -1020 && Val <= 1020) ||
           (Val == std::numeric_limits<int32_t>::min());
  }
 
  bool isMSRMask() const { return Kind == k_MSRMask; }
  bool isBankedReg() const { return Kind == k_BankedReg; }
  bool isProcIFlags() const { return Kind == k_ProcIFlags; }
 
  // NEON operands.
  bool isSingleSpacedVectorList() const {
    return Kind == k_VectorList && !VectorList.isDoubleSpaced;
  }
 
  bool isDoubleSpacedVectorList() const {
    return Kind == k_VectorList && VectorList.isDoubleSpaced;
  }
 
  bool isVecListOneD() const {
    if (!isSingleSpacedVectorList()) return false;
    return VectorList.Count == 1;
  }
 
  bool isVecListTwoMQ() const {
    return isSingleSpacedVectorList() && VectorList.Count == 2 &&
           ARMMCRegisterClasses[ARM::MQPRRegClassID].contains(
               VectorList.RegNum);
  }
 
  bool isVecListDPair() const {
    if (!isSingleSpacedVectorList()) return false;
    return (ARMMCRegisterClasses[ARM::DPairRegClassID]
              .contains(VectorList.RegNum));
  }
 
  bool isVecListThreeD() const {
    if (!isSingleSpacedVectorList()) return false;
    return VectorList.Count == 3;
  }
 
  bool isVecListFourD() const {
    if (!isSingleSpacedVectorList()) return false;
    return VectorList.Count == 4;
  }
 
  bool isVecListDPairSpaced() const {
    if (Kind != k_VectorList) return false;
    if (isSingleSpacedVectorList()) return false;
    return (ARMMCRegisterClasses[ARM::DPairSpcRegClassID]
              .contains(VectorList.RegNum));
  }
 
  bool isVecListThreeQ() const {
    if (!isDoubleSpacedVectorList()) return false;
    return VectorList.Count == 3;
  }
 
  bool isVecListFourQ() const {
    if (!isDoubleSpacedVectorList()) return false;
    return VectorList.Count == 4;
  }
 
  bool isVecListFourMQ() const {
    return isSingleSpacedVectorList() && VectorList.Count == 4 &&
           ARMMCRegisterClasses[ARM::MQPRRegClassID].contains(
               VectorList.RegNum);
  }
 
  bool isSingleSpacedVectorAllLanes() const {
    return Kind == k_VectorListAllLanes && !VectorList.isDoubleSpaced;
  }
 
  bool isDoubleSpacedVectorAllLanes() const {
    return Kind == k_VectorListAllLanes && VectorList.isDoubleSpaced;
  }
 
  bool isVecListOneDAllLanes() const {
    if (!isSingleSpacedVectorAllLanes()) return false;
    return VectorList.Count == 1;
  }
 
  bool isVecListDPairAllLanes() const {
    if (!isSingleSpacedVectorAllLanes()) return false;
    return (ARMMCRegisterClasses[ARM::DPairRegClassID]
              .contains(VectorList.RegNum));
  }
 
  bool isVecListDPairSpacedAllLanes() const {
    if (!isDoubleSpacedVectorAllLanes()) return false;
    return VectorList.Count == 2;
  }
 
  bool isVecListThreeDAllLanes() const {
    if (!isSingleSpacedVectorAllLanes()) return false;
    return VectorList.Count == 3;
  }
 
  bool isVecListThreeQAllLanes() const {
    if (!isDoubleSpacedVectorAllLanes()) return false;
    return VectorList.Count == 3;
  }
 
  bool isVecListFourDAllLanes() const {
    if (!isSingleSpacedVectorAllLanes()) return false;
    return VectorList.Count == 4;
  }
 
  bool isVecListFourQAllLanes() const {
    if (!isDoubleSpacedVectorAllLanes()) return false;
    return VectorList.Count == 4;
  }
 
  bool isSingleSpacedVectorIndexed() const {
    return Kind == k_VectorListIndexed && !VectorList.isDoubleSpaced;
  }
 
  bool isDoubleSpacedVectorIndexed() const {
    return Kind == k_VectorListIndexed && VectorList.isDoubleSpaced;
  }
 
  bool isVecListOneDByteIndexed() const {
    if (!isSingleSpacedVectorIndexed()) return false;
    return VectorList.Count == 1 && VectorList.LaneIndex <= 7;
  }
 
  bool isVecListOneDHWordIndexed() const {
    if (!isSingleSpacedVectorIndexed()) return false;
    return VectorList.Count == 1 && VectorList.LaneIndex <= 3;
  }
 
  bool isVecListOneDWordIndexed() const {
    if (!isSingleSpacedVectorIndexed()) return false;
    return VectorList.Count == 1 && VectorList.LaneIndex <= 1;
  }
 
  bool isVecListTwoDByteIndexed() const {
    if (!isSingleSpacedVectorIndexed()) return false;
    return VectorList.Count == 2 && VectorList.LaneIndex <= 7;
  }
 
  bool isVecListTwoDHWordIndexed() const {
    if (!isSingleSpacedVectorIndexed()) return false;
    return VectorList.Count == 2 && VectorList.LaneIndex <= 3;
  }
 
  bool isVecListTwoQWordIndexed() const {
    if (!isDoubleSpacedVectorIndexed()) return false;
    return VectorList.Count == 2 && VectorList.LaneIndex <= 1;
  }
 
  bool isVecListTwoQHWordIndexed() const {
    if (!isDoubleSpacedVectorIndexed()) return false;
    return VectorList.Count == 2 && VectorList.LaneIndex <= 3;
  }
 
  bool isVecListTwoDWordIndexed() const {
    if (!isSingleSpacedVectorIndexed()) return false;
    return VectorList.Count == 2 && VectorList.LaneIndex <= 1;
  }
 
  bool isVecListThreeDByteIndexed() const {
    if (!isSingleSpacedVectorIndexed()) return false;
    return VectorList.Count == 3 && VectorList.LaneIndex <= 7;
  }
 
  bool isVecListThreeDHWordIndexed() const {
    if (!isSingleSpacedVectorIndexed()) return false;
    return VectorList.Count == 3 && VectorList.LaneIndex <= 3;
  }
 
  bool isVecListThreeQWordIndexed() const {
    if (!isDoubleSpacedVectorIndexed()) return false;
    return VectorList.Count == 3 && VectorList.LaneIndex <= 1;
  }
 
  bool isVecListThreeQHWordIndexed() const {
    if (!isDoubleSpacedVectorIndexed()) return false;
    return VectorList.Count == 3 && VectorList.LaneIndex <= 3;
  }
 
  bool isVecListThreeDWordIndexed() const {
    if (!isSingleSpacedVectorIndexed()) return false;
    return VectorList.Count == 3 && VectorList.LaneIndex <= 1;
  }
 
  bool isVecListFourDByteIndexed() const {
    if (!isSingleSpacedVectorIndexed()) return false;
    return VectorList.Count == 4 && VectorList.LaneIndex <= 7;
  }
 
  bool isVecListFourDHWordIndexed() const {
    if (!isSingleSpacedVectorIndexed()) return false;
    return VectorList.Count == 4 && VectorList.LaneIndex <= 3;
  }
 
  bool isVecListFourQWordIndexed() const {
    if (!isDoubleSpacedVectorIndexed()) return false;
    return VectorList.Count == 4 && VectorList.LaneIndex <= 1;
  }
 
  bool isVecListFourQHWordIndexed() const {
    if (!isDoubleSpacedVectorIndexed()) return false;
    return VectorList.Count == 4 && VectorList.LaneIndex <= 3;
  }
 
  bool isVecListFourDWordIndexed() const {
    if (!isSingleSpacedVectorIndexed()) return false;
    return VectorList.Count == 4 && VectorList.LaneIndex <= 1;
  }
 
  bool isVectorIndex() const { return Kind == k_VectorIndex; }
 
  template <unsigned NumLanes>
  bool isVectorIndexInRange() const {
    if (Kind != k_VectorIndex) return false;
    return VectorIndex.Val < NumLanes;
  }
 
  bool isVectorIndex8()  const { return isVectorIndexInRange<8>(); }
  bool isVectorIndex16() const { return isVectorIndexInRange<4>(); }
  bool isVectorIndex32() const { return isVectorIndexInRange<2>(); }
  bool isVectorIndex64() const { return isVectorIndexInRange<1>(); }
 
  template<int PermittedValue, int OtherPermittedValue>
  bool isMVEPairVectorIndex() const {
    if (Kind != k_VectorIndex) return false;
    return VectorIndex.Val == PermittedValue ||
           VectorIndex.Val == OtherPermittedValue;
  }
 
  bool isNEONi8splat() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    // Must be a constant.
    if (!CE) return false;
    int64_t Value = CE->getValue();
    // i8 value splatted across 8 bytes. The immediate is just the 8 byte
    // value.
    return Value >= 0 && Value < 256;
  }
 
  bool isNEONi16splat() const {
    if (isNEONByteReplicate(2))
      return false; // Leave that for bytes replication and forbid by default.
    if (!isImm())
      return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    // Must be a constant.
    if (!CE) return false;
    unsigned Value = CE->getValue();
    return ARM_AM::isNEONi16splat(Value);
  }
 
  bool isNEONi16splatNot() const {
    if (!isImm())
      return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    // Must be a constant.
    if (!CE) return false;
    unsigned Value = CE->getValue();
    return ARM_AM::isNEONi16splat(~Value & 0xffff);
  }
 
  bool isNEONi32splat() const {
    if (isNEONByteReplicate(4))
      return false; // Leave that for bytes replication and forbid by default.
    if (!isImm())
      return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    // Must be a constant.
    if (!CE) return false;
    unsigned Value = CE->getValue();
    return ARM_AM::isNEONi32splat(Value);
  }
 
  bool isNEONi32splatNot() const {
    if (!isImm())
      return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    // Must be a constant.
    if (!CE) return false;
    unsigned Value = CE->getValue();
    return ARM_AM::isNEONi32splat(~Value);
  }
 
  static bool isValidNEONi32vmovImm(int64_t Value) {
    // i32 value with set bits only in one byte X000, 0X00, 00X0, or 000X,
    // for VMOV/VMVN only, 00Xf or 0Xff are also accepted.
    return ((Value & 0xffffffffffffff00) == 0) ||
           ((Value & 0xffffffffffff00ff) == 0) ||
           ((Value & 0xffffffffff00ffff) == 0) ||
           ((Value & 0xffffffff00ffffff) == 0) ||
           ((Value & 0xffffffffffff00ff) == 0xff) ||
           ((Value & 0xffffffffff00ffff) == 0xffff);
  }
 
  bool isNEONReplicate(unsigned Width, unsigned NumElems, bool Inv) const {
    assert((Width == 8 || Width == 16 || Width == 32) &&
           "Invalid element width");
    assert(NumElems * Width <= 64 && "Invalid result width");
 
    if (!isImm())
      return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    // Must be a constant.
    if (!CE)
      return false;
    int64_t Value = CE->getValue();
    if (!Value)
      return false; // Don't bother with zero.
    if (Inv)
      Value = ~Value;
 
    uint64_t Mask = (1ull << Width) - 1;
    uint64_t Elem = Value & Mask;
    if (Width == 16 && (Elem & 0x00ff) != 0 && (Elem & 0xff00) != 0)
      return false;
    if (Width == 32 && !isValidNEONi32vmovImm(Elem))
      return false;
 
    for (unsigned i = 1; i < NumElems; ++i) {
      Value >>= Width;
      if ((Value & Mask) != Elem)
        return false;
    }
    return true;
  }
 
  bool isNEONByteReplicate(unsigned NumBytes) const {
    return isNEONReplicate(8, NumBytes, false);
  }
 
  static void checkNeonReplicateArgs(unsigned FromW, unsigned ToW) {
    assert((FromW == 8 || FromW == 16 || FromW == 32) &&
           "Invalid source width");
    assert((ToW == 16 || ToW == 32 || ToW == 64) &&
           "Invalid destination width");
    assert(FromW < ToW && "ToW is not less than FromW");
  }
 
  template<unsigned FromW, unsigned ToW>
  bool isNEONmovReplicate() const {
    checkNeonReplicateArgs(FromW, ToW);
    if (ToW == 64 && isNEONi64splat())
      return false;
    return isNEONReplicate(FromW, ToW / FromW, false);
  }
 
  template<unsigned FromW, unsigned ToW>
  bool isNEONinvReplicate() const {
    checkNeonReplicateArgs(FromW, ToW);
    return isNEONReplicate(FromW, ToW / FromW, true);
  }
 
  bool isNEONi32vmov() const {
    if (isNEONByteReplicate(4))
      return false; // Let it to be classified as byte-replicate case.
    if (!isImm())
      return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    // Must be a constant.
    if (!CE)
      return false;
    return isValidNEONi32vmovImm(CE->getValue());
  }
 
  bool isNEONi32vmovNeg() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    // Must be a constant.
    if (!CE) return false;
    return isValidNEONi32vmovImm(~CE->getValue());
  }
 
  bool isNEONi64splat() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    // Must be a constant.
    if (!CE) return false;
    uint64_t Value = CE->getValue();
    // i64 value with each byte being either 0 or 0xff.
    for (unsigned i = 0; i < 8; ++i, Value >>= 8)
      if ((Value & 0xff) != 0 && (Value & 0xff) != 0xff) return false;
    return true;
  }
 
  template<int64_t Angle, int64_t Remainder>
  bool isComplexRotation() const {
    if (!isImm()) return false;
 
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    uint64_t Value = CE->getValue();
 
    return (Value % Angle == Remainder && Value <= 270);
  }
 
  bool isMVELongShift() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    // Must be a constant.
    if (!CE) return false;
    uint64_t Value = CE->getValue();
    return Value >= 1 && Value <= 32;
  }
 
  bool isMveSaturateOp() const {
    if (!isImm()) return false;
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    if (!CE) return false;
    uint64_t Value = CE->getValue();
    return Value == 48 || Value == 64;
  }
 
  bool isITCondCodeNoAL() const {
    if (!isITCondCode()) return false;
    ARMCC::CondCodes CC = getCondCode();
    return CC != ARMCC::AL;
  }
 
  bool isITCondCodeRestrictedI() const {
    if (!isITCondCode())
      return false;
    ARMCC::CondCodes CC = getCondCode();
    return CC == ARMCC::EQ || CC == ARMCC::NE;
  }
 
  bool isITCondCodeRestrictedS() const {
    if (!isITCondCode())
      return false;
    ARMCC::CondCodes CC = getCondCode();
    return CC == ARMCC::LT || CC == ARMCC::GT || CC == ARMCC::LE ||
           CC == ARMCC::GE;
  }
 
  bool isITCondCodeRestrictedU() const {
    if (!isITCondCode())
      return false;
    ARMCC::CondCodes CC = getCondCode();
    return CC == ARMCC::HS || CC == ARMCC::HI;
  }
 
  bool isITCondCodeRestrictedFP() const {
    if (!isITCondCode())
      return false;
    ARMCC::CondCodes CC = getCondCode();
    return CC == ARMCC::EQ || CC == ARMCC::NE || CC == ARMCC::LT ||
           CC == ARMCC::GT || CC == ARMCC::LE || CC == ARMCC::GE;
  }
 
  void addExpr(MCInst &Inst, const MCExpr *Expr) const {
    // Add as immediates when possible.  Null MCExpr = 0.
    if (!Expr)
      Inst.addOperand(MCOperand::createImm(0));
    else if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Expr))
      Inst.addOperand(MCOperand::createImm(CE->getValue()));
    else
      Inst.addOperand(MCOperand::createExpr(Expr));
  }
 
  void addARMBranchTargetOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    addExpr(Inst, getImm());
  }
 
  void addThumbBranchTargetOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    addExpr(Inst, getImm());
  }
 
  void addCondCodeOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(unsigned(getCondCode())));
    unsigned RegNum = getCondCode() == ARMCC::AL ? 0: ARM::CPSR;
    Inst.addOperand(MCOperand::createReg(RegNum));
  }
 
  void addVPTPredNOperands(MCInst &Inst, unsigned N) const {
    assert(N == 3 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(unsigned(getVPTPred())));
    unsigned RegNum = getVPTPred() == ARMVCC::None ? 0: ARM::P0;
    Inst.addOperand(MCOperand::createReg(RegNum));
    Inst.addOperand(MCOperand::createReg(0));
  }
 
  void addVPTPredROperands(MCInst &Inst, unsigned N) const {
    assert(N == 4 && "Invalid number of operands!");
    addVPTPredNOperands(Inst, N-1);
    unsigned RegNum;
    if (getVPTPred() == ARMVCC::None) {
      RegNum = 0;
    } else {
      unsigned NextOpIndex = Inst.getNumOperands();
      const MCInstrDesc &MCID = ARMInsts[Inst.getOpcode()];
      int TiedOp = MCID.getOperandConstraint(NextOpIndex, MCOI::TIED_TO);
      assert(TiedOp >= 0 &&
             "Inactive register in vpred_r is not tied to an output!");
      RegNum = Inst.getOperand(TiedOp).getReg();
    }
    Inst.addOperand(MCOperand::createReg(RegNum));
  }
 
  void addCoprocNumOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(getCoproc()));
  }
 
  void addCoprocRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(getCoproc()));
  }
 
  void addCoprocOptionOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(CoprocOption.Val));
  }
 
  void addITMaskOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(ITMask.Mask));
  }
 
  void addITCondCodeOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(unsigned(getCondCode())));
  }
 
  void addITCondCodeInvOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(unsigned(ARMCC::getOppositeCondition(getCondCode()))));
  }
 
  void addCCOutOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getReg()));
  }
 
  void addRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getReg()));
  }
 
  void addRegShiftedRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 3 && "Invalid number of operands!");
    assert(isRegShiftedReg() &&
           "addRegShiftedRegOperands() on non-RegShiftedReg!");
    Inst.addOperand(MCOperand::createReg(RegShiftedReg.SrcReg));
    Inst.addOperand(MCOperand::createReg(RegShiftedReg.ShiftReg));
    Inst.addOperand(MCOperand::createImm(
      ARM_AM::getSORegOpc(RegShiftedReg.ShiftTy, RegShiftedReg.ShiftImm)));
  }
 
  void addRegShiftedImmOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    assert(isRegShiftedImm() &&
           "addRegShiftedImmOperands() on non-RegShiftedImm!");
    Inst.addOperand(MCOperand::createReg(RegShiftedImm.SrcReg));
    // Shift of #32 is encoded as 0 where permitted
    unsigned Imm = (RegShiftedImm.ShiftImm == 32 ? 0 : RegShiftedImm.ShiftImm);
    Inst.addOperand(MCOperand::createImm(
      ARM_AM::getSORegOpc(RegShiftedImm.ShiftTy, Imm)));
  }
 
  void addShifterImmOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm((ShifterImm.isASR << 5) |
                                         ShifterImm.Imm));
  }
 
  void addRegListOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const SmallVectorImpl<unsigned> &RegList = getRegList();
    for (unsigned Reg : RegList)
      Inst.addOperand(MCOperand::createReg(Reg));
  }
 
  void addRegListWithAPSROperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const SmallVectorImpl<unsigned> &RegList = getRegList();
    for (unsigned Reg : RegList)
      Inst.addOperand(MCOperand::createReg(Reg));
  }
 
  void addDPRRegListOperands(MCInst &Inst, unsigned N) const {
    addRegListOperands(Inst, N);
  }
 
  void addSPRRegListOperands(MCInst &Inst, unsigned N) const {
    addRegListOperands(Inst, N);
  }
 
  void addFPSRegListWithVPROperands(MCInst &Inst, unsigned N) const {
    addRegListOperands(Inst, N);
  }
 
  void addFPDRegListWithVPROperands(MCInst &Inst, unsigned N) const {
    addRegListOperands(Inst, N);
  }
 
  void addRotImmOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // Encoded as val>>3. The printer handles display as 8, 16, 24.
    Inst.addOperand(MCOperand::createImm(RotImm.Imm >> 3));
  }
 
  void addModImmOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
 
    // Support for fixups (MCFixup)
    if (isImm())
      return addImmOperands(Inst, N);
 
    Inst.addOperand(MCOperand::createImm(ModImm.Bits | (ModImm.Rot << 7)));
  }
 
  void addModImmNotOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    uint32_t Enc = ARM_AM::getSOImmVal(~CE->getValue());
    Inst.addOperand(MCOperand::createImm(Enc));
  }
 
  void addModImmNegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    uint32_t Enc = ARM_AM::getSOImmVal(-CE->getValue());
    Inst.addOperand(MCOperand::createImm(Enc));
  }
 
  void addThumbModImmNeg8_255Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    uint32_t Val = -CE->getValue();
    Inst.addOperand(MCOperand::createImm(Val));
  }
 
  void addThumbModImmNeg1_7Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    uint32_t Val = -CE->getValue();
    Inst.addOperand(MCOperand::createImm(Val));
  }
 
  void addBitfieldOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // Munge the lsb/width into a bitfield mask.
    unsigned lsb = Bitfield.LSB;
    unsigned width = Bitfield.Width;
    // Make a 32-bit mask w/ the referenced bits clear and all other bits set.
    uint32_t Mask = ~(((uint32_t)0xffffffff >> lsb) << (32 - width) >>
                      (32 - (lsb + width)));
    Inst.addOperand(MCOperand::createImm(Mask));
  }
 
  void addImmOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    addExpr(Inst, getImm());
  }
 
  void addFBits16Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(16 - CE->getValue()));
  }
 
  void addFBits32Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(32 - CE->getValue()));
  }
 
  void addFPImmOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    int Val = ARM_AM::getFP32Imm(APInt(32, CE->getValue()));
    Inst.addOperand(MCOperand::createImm(Val));
  }
 
  void addImm8s4Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // FIXME: We really want to scale the value here, but the LDRD/STRD
    // instruction don't encode operands that way yet.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(CE->getValue()));
  }
 
  void addImm7s4Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // FIXME: We really want to scale the value here, but the VSTR/VLDR_VSYSR
    // instruction don't encode operands that way yet.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(CE->getValue()));
  }
 
  void addImm7Shift0Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(CE->getValue()));
  }
 
  void addImm7Shift1Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(CE->getValue()));
  }
 
  void addImm7Shift2Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(CE->getValue()));
  }
 
  void addImm7Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(CE->getValue()));
  }
 
  void addImm0_1020s4Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The immediate is scaled by four in the encoding and is stored
    // in the MCInst as such. Lop off the low two bits here.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(CE->getValue() / 4));
  }
 
  void addImm0_508s4NegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The immediate is scaled by four in the encoding and is stored
    // in the MCInst as such. Lop off the low two bits here.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(-(CE->getValue() / 4)));
  }
 
  void addImm0_508s4Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The immediate is scaled by four in the encoding and is stored
    // in the MCInst as such. Lop off the low two bits here.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(CE->getValue() / 4));
  }
 
  void addImm1_16Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The constant encodes as the immediate-1, and we store in the instruction
    // the bits as encoded, so subtract off one here.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(CE->getValue() - 1));
  }
 
  void addImm1_32Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The constant encodes as the immediate-1, and we store in the instruction
    // the bits as encoded, so subtract off one here.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(CE->getValue() - 1));
  }
 
  void addImmThumbSROperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The constant encodes as the immediate, except for 32, which encodes as
    // zero.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    unsigned Imm = CE->getValue();
    Inst.addOperand(MCOperand::createImm((Imm == 32 ? 0 : Imm)));
  }
 
  void addPKHASRImmOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // An ASR value of 32 encodes as 0, so that's how we want to add it to
    // the instruction as well.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    int Val = CE->getValue();
    Inst.addOperand(MCOperand::createImm(Val == 32 ? 0 : Val));
  }
 
  void addT2SOImmNotOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The operand is actually a t2_so_imm, but we have its bitwise
    // negation in the assembly source, so twiddle it here.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(~(uint32_t)CE->getValue()));
  }
 
  void addT2SOImmNegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The operand is actually a t2_so_imm, but we have its
    // negation in the assembly source, so twiddle it here.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(-(uint32_t)CE->getValue()));
  }
 
  void addImm0_4095NegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The operand is actually an imm0_4095, but we have its
    // negation in the assembly source, so twiddle it here.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(-(uint32_t)CE->getValue()));
  }
 
  void addUnsignedOffset_b8s2Operands(MCInst &Inst, unsigned N) const {
    if(const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm())) {
      Inst.addOperand(MCOperand::createImm(CE->getValue() >> 2));
      return;
    }
    const MCSymbolRefExpr *SR = cast<MCSymbolRefExpr>(Imm.Val);
    Inst.addOperand(MCOperand::createExpr(SR));
  }
 
  void addThumbMemPCOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    if (isImm()) {
      const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
      if (CE) {
        Inst.addOperand(MCOperand::createImm(CE->getValue()));
        return;
      }
      const MCSymbolRefExpr *SR = cast<MCSymbolRefExpr>(Imm.Val);
      Inst.addOperand(MCOperand::createExpr(SR));
      return;
    }
 
    assert(isGPRMem()  && "Unknown value type!");
    assert(isa<MCConstantExpr>(Memory.OffsetImm) && "Unknown value type!");
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm))
      Inst.addOperand(MCOperand::createImm(CE->getValue()));
    else
      Inst.addOperand(MCOperand::createExpr(Memory.OffsetImm));
  }
 
  void addMemBarrierOptOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(unsigned(getMemBarrierOpt())));
  }
 
  void addInstSyncBarrierOptOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(unsigned(getInstSyncBarrierOpt())));
  }
 
  void addTraceSyncBarrierOptOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(unsigned(getTraceSyncBarrierOpt())));
  }
 
  void addMemNoOffsetOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
  }
 
  void addMemNoOffsetT2Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
  }
 
  void addMemNoOffsetT2NoSpOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
  }
 
  void addMemNoOffsetTOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
  }
 
  void addMemPCRelImm12Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm))
      Inst.addOperand(MCOperand::createImm(CE->getValue()));
    else
      Inst.addOperand(MCOperand::createExpr(Memory.OffsetImm));
  }
 
  void addAdrLabelOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    assert(isImm() && "Not an immediate!");
 
    // If we have an immediate that's not a constant, treat it as a label
    // reference needing a fixup.
    if (!isa<MCConstantExpr>(getImm())) {
      Inst.addOperand(MCOperand::createExpr(getImm()));
      return;
    }
 
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    int Val = CE->getValue();
    Inst.addOperand(MCOperand::createImm(Val));
  }
 
  void addAlignedMemoryOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    Inst.addOperand(MCOperand::createImm(Memory.Alignment));
  }
 
  void addDupAlignedMemoryNoneOperands(MCInst &Inst, unsigned N) const {
    addAlignedMemoryOperands(Inst, N);
  }
 
  void addAlignedMemoryNoneOperands(MCInst &Inst, unsigned N) const {
    addAlignedMemoryOperands(Inst, N);
  }
 
  void addAlignedMemory16Operands(MCInst &Inst, unsigned N) const {
    addAlignedMemoryOperands(Inst, N);
  }
 
  void addDupAlignedMemory16Operands(MCInst &Inst, unsigned N) const {
    addAlignedMemoryOperands(Inst, N);
  }
 
  void addAlignedMemory32Operands(MCInst &Inst, unsigned N) const {
    addAlignedMemoryOperands(Inst, N);
  }
 
  void addDupAlignedMemory32Operands(MCInst &Inst, unsigned N) const {
    addAlignedMemoryOperands(Inst, N);
  }
 
  void addAlignedMemory64Operands(MCInst &Inst, unsigned N) const {
    addAlignedMemoryOperands(Inst, N);
  }
 
  void addDupAlignedMemory64Operands(MCInst &Inst, unsigned N) const {
    addAlignedMemoryOperands(Inst, N);
  }
 
  void addAlignedMemory64or128Operands(MCInst &Inst, unsigned N) const {
    addAlignedMemoryOperands(Inst, N);
  }
 
  void addDupAlignedMemory64or128Operands(MCInst &Inst, unsigned N) const {
    addAlignedMemoryOperands(Inst, N);
  }
 
  void addAlignedMemory64or128or256Operands(MCInst &Inst, unsigned N) const {
    addAlignedMemoryOperands(Inst, N);
  }
 
  void addAddrMode2Operands(MCInst &Inst, unsigned N) const {
    assert(N == 3 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    Inst.addOperand(MCOperand::createReg(Memory.OffsetRegNum));
    if (!Memory.OffsetRegNum) {
      if (!Memory.OffsetImm)
        Inst.addOperand(MCOperand::createImm(0));
      else if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
        int32_t Val = CE->getValue();
        ARM_AM::AddrOpc AddSub = Val < 0 ? ARM_AM::sub : ARM_AM::add;
        // Special case for #-0
        if (Val == std::numeric_limits<int32_t>::min())
          Val = 0;
        if (Val < 0)
          Val = -Val;
        Val = ARM_AM::getAM2Opc(AddSub, Val, ARM_AM::no_shift);
        Inst.addOperand(MCOperand::createImm(Val));
      } else
        Inst.addOperand(MCOperand::createExpr(Memory.OffsetImm));
    } else {
      // For register offset, we encode the shift type and negation flag
      // here.
      int32_t Val =
          ARM_AM::getAM2Opc(Memory.isNegative ? ARM_AM::sub : ARM_AM::add,
                            Memory.ShiftImm, Memory.ShiftType);
      Inst.addOperand(MCOperand::createImm(Val));
    }
  }
 
  void addAM2OffsetImmOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    assert(CE && "non-constant AM2OffsetImm operand!");
    int32_t Val = CE->getValue();
    ARM_AM::AddrOpc AddSub = Val < 0 ? ARM_AM::sub : ARM_AM::add;
    // Special case for #-0
    if (Val == std::numeric_limits<int32_t>::min()) Val = 0;
    if (Val < 0) Val = -Val;
    Val = ARM_AM::getAM2Opc(AddSub, Val, ARM_AM::no_shift);
    Inst.addOperand(MCOperand::createReg(0));
    Inst.addOperand(MCOperand::createImm(Val));
  }
 
  void addAddrMode3Operands(MCInst &Inst, unsigned N) const {
    assert(N == 3 && "Invalid number of operands!");
    // If we have an immediate that's not a constant, treat it as a label
    // reference needing a fixup. If it is a constant, it's something else
    // and we reject it.
    if (isImm()) {
      Inst.addOperand(MCOperand::createExpr(getImm()));
      Inst.addOperand(MCOperand::createReg(0));
      Inst.addOperand(MCOperand::createImm(0));
      return;
    }
 
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    Inst.addOperand(MCOperand::createReg(Memory.OffsetRegNum));
    if (!Memory.OffsetRegNum) {
      if (!Memory.OffsetImm)
        Inst.addOperand(MCOperand::createImm(0));
      else if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
        int32_t Val = CE->getValue();
        ARM_AM::AddrOpc AddSub = Val < 0 ? ARM_AM::sub : ARM_AM::add;
        // Special case for #-0
        if (Val == std::numeric_limits<int32_t>::min())
          Val = 0;
        if (Val < 0)
          Val = -Val;
        Val = ARM_AM::getAM3Opc(AddSub, Val);
        Inst.addOperand(MCOperand::createImm(Val));
      } else
        Inst.addOperand(MCOperand::createExpr(Memory.OffsetImm));
    } else {
      // For register offset, we encode the shift type and negation flag
      // here.
      int32_t Val =
          ARM_AM::getAM3Opc(Memory.isNegative ? ARM_AM::sub : ARM_AM::add, 0);
      Inst.addOperand(MCOperand::createImm(Val));
    }
  }
 
  void addAM3OffsetOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    if (Kind == k_PostIndexRegister) {
      int32_t Val =
        ARM_AM::getAM3Opc(PostIdxReg.isAdd ? ARM_AM::add : ARM_AM::sub, 0);
      Inst.addOperand(MCOperand::createReg(PostIdxReg.RegNum));
      Inst.addOperand(MCOperand::createImm(Val));
      return;
    }
 
    // Constant offset.
    const MCConstantExpr *CE = static_cast<const MCConstantExpr*>(getImm());
    int32_t Val = CE->getValue();
    ARM_AM::AddrOpc AddSub = Val < 0 ? ARM_AM::sub : ARM_AM::add;
    // Special case for #-0
    if (Val == std::numeric_limits<int32_t>::min()) Val = 0;
    if (Val < 0) Val = -Val;
    Val = ARM_AM::getAM3Opc(AddSub, Val);
    Inst.addOperand(MCOperand::createReg(0));
    Inst.addOperand(MCOperand::createImm(Val));
  }
 
  void addAddrMode5Operands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    // If we have an immediate that's not a constant, treat it as a label
    // reference needing a fixup. If it is a constant, it's something else
    // and we reject it.
    if (isImm()) {
      Inst.addOperand(MCOperand::createExpr(getImm()));
      Inst.addOperand(MCOperand::createImm(0));
      return;
    }
 
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    if (!Memory.OffsetImm)
      Inst.addOperand(MCOperand::createImm(0));
    else if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      // The lower two bits are always zero and as such are not encoded.
      int32_t Val = CE->getValue() / 4;
      ARM_AM::AddrOpc AddSub = Val < 0 ? ARM_AM::sub : ARM_AM::add;
      // Special case for #-0
      if (Val == std::numeric_limits<int32_t>::min())
        Val = 0;
      if (Val < 0)
        Val = -Val;
      Val = ARM_AM::getAM5Opc(AddSub, Val);
      Inst.addOperand(MCOperand::createImm(Val));
    } else
      Inst.addOperand(MCOperand::createExpr(Memory.OffsetImm));
  }
 
  void addAddrMode5FP16Operands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    // If we have an immediate that's not a constant, treat it as a label
    // reference needing a fixup. If it is a constant, it's something else
    // and we reject it.
    if (isImm()) {
      Inst.addOperand(MCOperand::createExpr(getImm()));
      Inst.addOperand(MCOperand::createImm(0));
      return;
    }
 
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    // The lower bit is always zero and as such is not encoded.
    if (!Memory.OffsetImm)
      Inst.addOperand(MCOperand::createImm(0));
    else if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm)) {
      int32_t Val = CE->getValue() / 2;
      ARM_AM::AddrOpc AddSub = Val < 0 ? ARM_AM::sub : ARM_AM::add;
      // Special case for #-0
      if (Val == std::numeric_limits<int32_t>::min())
        Val = 0;
      if (Val < 0)
        Val = -Val;
      Val = ARM_AM::getAM5FP16Opc(AddSub, Val);
      Inst.addOperand(MCOperand::createImm(Val));
    } else
      Inst.addOperand(MCOperand::createExpr(Memory.OffsetImm));
  }
 
  void addMemImm8s4OffsetOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    // If we have an immediate that's not a constant, treat it as a label
    // reference needing a fixup. If it is a constant, it's something else
    // and we reject it.
    if (isImm()) {
      Inst.addOperand(MCOperand::createExpr(getImm()));
      Inst.addOperand(MCOperand::createImm(0));
      return;
    }
 
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    addExpr(Inst, Memory.OffsetImm);
  }
 
  void addMemImm7s4OffsetOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    // If we have an immediate that's not a constant, treat it as a label
    // reference needing a fixup. If it is a constant, it's something else
    // and we reject it.
    if (isImm()) {
      Inst.addOperand(MCOperand::createExpr(getImm()));
      Inst.addOperand(MCOperand::createImm(0));
      return;
    }
 
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    addExpr(Inst, Memory.OffsetImm);
  }
 
  void addMemImm0_1020s4OffsetOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    if (!Memory.OffsetImm)
      Inst.addOperand(MCOperand::createImm(0));
    else if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm))
      // The lower two bits are always zero and as such are not encoded.
      Inst.addOperand(MCOperand::createImm(CE->getValue() / 4));
    else
      Inst.addOperand(MCOperand::createExpr(Memory.OffsetImm));
  }
 
  void addMemImmOffsetOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    addExpr(Inst, Memory.OffsetImm);
  }
 
  void addMemRegRQOffsetOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    Inst.addOperand(MCOperand::createReg(Memory.OffsetRegNum));
  }
 
  void addMemUImm12OffsetOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    // If this is an immediate, it's a label reference.
    if (isImm()) {
      addExpr(Inst, getImm());
      Inst.addOperand(MCOperand::createImm(0));
      return;
    }
 
    // Otherwise, it's a normal memory reg+offset.
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    addExpr(Inst, Memory.OffsetImm);
  }
 
  void addMemImm12OffsetOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    // If this is an immediate, it's a label reference.
    if (isImm()) {
      addExpr(Inst, getImm());
      Inst.addOperand(MCOperand::createImm(0));
      return;
    }
 
    // Otherwise, it's a normal memory reg+offset.
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    addExpr(Inst, Memory.OffsetImm);
  }
 
  void addConstPoolAsmImmOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // This is container for the immediate that we will create the constant
    // pool from
    addExpr(Inst, getConstantPoolImm());
  }
 
  void addMemTBBOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    Inst.addOperand(MCOperand::createReg(Memory.OffsetRegNum));
  }
 
  void addMemTBHOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    Inst.addOperand(MCOperand::createReg(Memory.OffsetRegNum));
  }
 
  void addMemRegOffsetOperands(MCInst &Inst, unsigned N) const {
    assert(N == 3 && "Invalid number of operands!");
    unsigned Val =
      ARM_AM::getAM2Opc(Memory.isNegative ? ARM_AM::sub : ARM_AM::add,
                        Memory.ShiftImm, Memory.ShiftType);
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    Inst.addOperand(MCOperand::createReg(Memory.OffsetRegNum));
    Inst.addOperand(MCOperand::createImm(Val));
  }
 
  void addT2MemRegOffsetOperands(MCInst &Inst, unsigned N) const {
    assert(N == 3 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    Inst.addOperand(MCOperand::createReg(Memory.OffsetRegNum));
    Inst.addOperand(MCOperand::createImm(Memory.ShiftImm));
  }
 
  void addMemThumbRROperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    Inst.addOperand(MCOperand::createReg(Memory.OffsetRegNum));
  }
 
  void addMemThumbRIs4Operands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    if (!Memory.OffsetImm)
      Inst.addOperand(MCOperand::createImm(0));
    else if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm))
      // The lower two bits are always zero and as such are not encoded.
      Inst.addOperand(MCOperand::createImm(CE->getValue() / 4));
    else
      Inst.addOperand(MCOperand::createExpr(Memory.OffsetImm));
  }
 
  void addMemThumbRIs2Operands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    if (!Memory.OffsetImm)
      Inst.addOperand(MCOperand::createImm(0));
    else if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm))
      Inst.addOperand(MCOperand::createImm(CE->getValue() / 2));
    else
      Inst.addOperand(MCOperand::createExpr(Memory.OffsetImm));
  }
 
  void addMemThumbRIs1Operands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    addExpr(Inst, Memory.OffsetImm);
  }
 
  void addMemThumbSPIOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(Memory.BaseRegNum));
    if (!Memory.OffsetImm)
      Inst.addOperand(MCOperand::createImm(0));
    else if (const auto *CE = dyn_cast<MCConstantExpr>(Memory.OffsetImm))
      // The lower two bits are always zero and as such are not encoded.
      Inst.addOperand(MCOperand::createImm(CE->getValue() / 4));
    else
      Inst.addOperand(MCOperand::createExpr(Memory.OffsetImm));
  }
 
  void addPostIdxImm8Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    assert(CE && "non-constant post-idx-imm8 operand!");
    int Imm = CE->getValue();
    bool isAdd = Imm >= 0;
    if (Imm == std::numeric_limits<int32_t>::min()) Imm = 0;
    Imm = (Imm < 0 ? -Imm : Imm) | (int)isAdd << 8;
    Inst.addOperand(MCOperand::createImm(Imm));
  }
 
  void addPostIdxImm8s4Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
    assert(CE && "non-constant post-idx-imm8s4 operand!");
    int Imm = CE->getValue();
    bool isAdd = Imm >= 0;
    if (Imm == std::numeric_limits<int32_t>::min()) Imm = 0;
    // Immediate is scaled by 4.
    Imm = ((Imm < 0 ? -Imm : Imm) / 4) | (int)isAdd << 8;
    Inst.addOperand(MCOperand::createImm(Imm));
  }
 
  void addPostIdxRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(PostIdxReg.RegNum));
    Inst.addOperand(MCOperand::createImm(PostIdxReg.isAdd));
  }
 
  void addPostIdxRegShiftedOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(PostIdxReg.RegNum));
    // The sign, shift type, and shift amount are encoded in a single operand
    // using the AM2 encoding helpers.
    ARM_AM::AddrOpc opc = PostIdxReg.isAdd ? ARM_AM::add : ARM_AM::sub;
    unsigned Imm = ARM_AM::getAM2Opc(opc, PostIdxReg.ShiftImm,
                                     PostIdxReg.ShiftTy);
    Inst.addOperand(MCOperand::createImm(Imm));
  }
 
  void addPowerTwoOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(CE->getValue()));
  }
 
  void addMSRMaskOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(unsigned(getMSRMask())));
  }
 
  void addBankedRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(unsigned(getBankedReg())));
  }
 
  void addProcIFlagsOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(unsigned(getProcIFlags())));
  }
 
  void addVecListOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(VectorList.RegNum));
  }
 
  void addMVEVecListOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
 
    // When we come here, the VectorList field will identify a range
    // of q-registers by its base register and length, and it will
    // have already been error-checked to be the expected length of
    // range and contain only q-regs in the range q0-q7. So we can
    // count on the base register being in the range q0-q6 (for 2
    // regs) or q0-q4 (for 4)
    //
    // The MVE instructions taking a register range of this kind will
    // need an operand in the MQQPR or MQQQQPR class, representing the
    // entire range as a unit. So we must translate into that class,
    // by finding the index of the base register in the MQPR reg
    // class, and returning the super-register at the corresponding
    // index in the target class.
 
    const MCRegisterClass *RC_in = &ARMMCRegisterClasses[ARM::MQPRRegClassID];
    const MCRegisterClass *RC_out =
        (VectorList.Count == 2) ? &ARMMCRegisterClasses[ARM::MQQPRRegClassID]
                                : &ARMMCRegisterClasses[ARM::MQQQQPRRegClassID];
 
    unsigned I, E = RC_out->getNumRegs();
    for (I = 0; I < E; I++)
      if (RC_in->getRegister(I) == VectorList.RegNum)
        break;
    assert(I < E && "Invalid vector list start register!");
 
    Inst.addOperand(MCOperand::createReg(RC_out->getRegister(I)));
  }
 
  void addVecListIndexedOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(VectorList.RegNum));
    Inst.addOperand(MCOperand::createImm(VectorList.LaneIndex));
  }
 
  void addVectorIndex8Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(getVectorIndex()));
  }
 
  void addVectorIndex16Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(getVectorIndex()));
  }
 
  void addVectorIndex32Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(getVectorIndex()));
  }
 
  void addVectorIndex64Operands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(getVectorIndex()));
  }
 
  void addMVEVectorIndexOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(getVectorIndex()));
  }
 
  void addMVEPairVectorIndexOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createImm(getVectorIndex()));
  }
 
  void addNEONi8splatOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The immediate encodes the type of constant as well as the value.
    // Mask in that this is an i8 splat.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(CE->getValue() | 0xe00));
  }
 
  void addNEONi16splatOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The immediate encodes the type of constant as well as the value.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    unsigned Value = CE->getValue();
    Value = ARM_AM::encodeNEONi16splat(Value);
    Inst.addOperand(MCOperand::createImm(Value));
  }
 
  void addNEONi16splatNotOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The immediate encodes the type of constant as well as the value.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    unsigned Value = CE->getValue();
    Value = ARM_AM::encodeNEONi16splat(~Value & 0xffff);
    Inst.addOperand(MCOperand::createImm(Value));
  }
 
  void addNEONi32splatOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The immediate encodes the type of constant as well as the value.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    unsigned Value = CE->getValue();
    Value = ARM_AM::encodeNEONi32splat(Value);
    Inst.addOperand(MCOperand::createImm(Value));
  }
 
  void addNEONi32splatNotOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The immediate encodes the type of constant as well as the value.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    unsigned Value = CE->getValue();
    Value = ARM_AM::encodeNEONi32splat(~Value);
    Inst.addOperand(MCOperand::createImm(Value));
  }
 
  void addNEONi8ReplicateOperands(MCInst &Inst, bool Inv) const {
    // The immediate encodes the type of constant as well as the value.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    assert((Inst.getOpcode() == ARM::VMOVv8i8 ||
            Inst.getOpcode() == ARM::VMOVv16i8) &&
          "All instructions that wants to replicate non-zero byte "
          "always must be replaced with VMOVv8i8 or VMOVv16i8.");
    unsigned Value = CE->getValue();
    if (Inv)
      Value = ~Value;
    unsigned B = Value & 0xff;
    B |= 0xe00; // cmode = 0b1110
    Inst.addOperand(MCOperand::createImm(B));
  }
 
  void addNEONinvi8ReplicateOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    addNEONi8ReplicateOperands(Inst, true);
  }
 
  static unsigned encodeNeonVMOVImmediate(unsigned Value) {
    if (Value >= 256 && Value <= 0xffff)
      Value = (Value >> 8) | ((Value & 0xff) ? 0xc00 : 0x200);
    else if (Value > 0xffff && Value <= 0xffffff)
      Value = (Value >> 16) | ((Value & 0xff) ? 0xd00 : 0x400);
    else if (Value > 0xffffff)
      Value = (Value >> 24) | 0x600;
    return Value;
  }
 
  void addNEONi32vmovOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The immediate encodes the type of constant as well as the value.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    unsigned Value = encodeNeonVMOVImmediate(CE->getValue());
    Inst.addOperand(MCOperand::createImm(Value));
  }
 
  void addNEONvmovi8ReplicateOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    addNEONi8ReplicateOperands(Inst, false);
  }
 
  void addNEONvmovi16ReplicateOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    assert((Inst.getOpcode() == ARM::VMOVv4i16 ||
            Inst.getOpcode() == ARM::VMOVv8i16 ||
            Inst.getOpcode() == ARM::VMVNv4i16 ||
            Inst.getOpcode() == ARM::VMVNv8i16) &&
          "All instructions that want to replicate non-zero half-word "
          "always must be replaced with V{MOV,MVN}v{4,8}i16.");
    uint64_t Value = CE->getValue();
    unsigned Elem = Value & 0xffff;
    if (Elem >= 256)
      Elem = (Elem >> 8) | 0x200;
    Inst.addOperand(MCOperand::createImm(Elem));
  }
 
  void addNEONi32vmovNegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The immediate encodes the type of constant as well as the value.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    unsigned Value = encodeNeonVMOVImmediate(~CE->getValue());
    Inst.addOperand(MCOperand::createImm(Value));
  }
 
  void addNEONvmovi32ReplicateOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    assert((Inst.getOpcode() == ARM::VMOVv2i32 ||
            Inst.getOpcode() == ARM::VMOVv4i32 ||
            Inst.getOpcode() == ARM::VMVNv2i32 ||
            Inst.getOpcode() == ARM::VMVNv4i32) &&
          "All instructions that want to replicate non-zero word "
          "always must be replaced with V{MOV,MVN}v{2,4}i32.");
    uint64_t Value = CE->getValue();
    unsigned Elem = encodeNeonVMOVImmediate(Value & 0xffffffff);
    Inst.addOperand(MCOperand::createImm(Elem));
  }
 
  void addNEONi64splatOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    // The immediate encodes the type of constant as well as the value.
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    uint64_t Value = CE->getValue();
    unsigned Imm = 0;
    for (unsigned i = 0; i < 8; ++i, Value >>= 8) {
      Imm |= (Value & 1) << i;
    }
    Inst.addOperand(MCOperand::createImm(Imm | 0x1e00));
  }
 
  void addComplexRotationEvenOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm(CE->getValue() / 90));
  }
 
  void addComplexRotationOddOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    Inst.addOperand(MCOperand::createImm((CE->getValue() - 90) / 180));
  }
 
  void addMveSaturateOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCConstantExpr *CE = cast<MCConstantExpr>(getImm());
    unsigned Imm = CE->getValue();
    assert((Imm == 48 || Imm == 64) && "Invalid saturate operand");
    Inst.addOperand(MCOperand::createImm(Imm == 48 ? 1 : 0));
  }
 
  void print(raw_ostream &OS) const override;
 
  static std::unique_ptr<ARMOperand> CreateITMask(unsigned Mask, SMLoc S) {
    auto Op = std::make_unique<ARMOperand>(k_ITCondMask);
    Op->ITMask.Mask = Mask;
    Op->StartLoc = S;
    Op->EndLoc = S;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateCondCode(ARMCC::CondCodes CC,
                                                    SMLoc S) {
    auto Op = std::make_unique<ARMOperand>(k_CondCode);
    Op->CC.Val = CC;
    Op->StartLoc = S;
    Op->EndLoc = S;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateVPTPred(ARMVCC::VPTCodes CC,
                                                   SMLoc S) {
    auto Op = std::make_unique<ARMOperand>(k_VPTPred);
    Op->VCC.Val = CC;
    Op->StartLoc = S;
    Op->EndLoc = S;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateCoprocNum(unsigned CopVal, SMLoc S) {
    auto Op = std::make_unique<ARMOperand>(k_CoprocNum);
    Op->Cop.Val = CopVal;
    Op->StartLoc = S;
    Op->EndLoc = S;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateCoprocReg(unsigned CopVal, SMLoc S) {
    auto Op = std::make_unique<ARMOperand>(k_CoprocReg);
    Op->Cop.Val = CopVal;
    Op->StartLoc = S;
    Op->EndLoc = S;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateCoprocOption(unsigned Val, SMLoc S,
                                                        SMLoc E) {
    auto Op = std::make_unique<ARMOperand>(k_CoprocOption);
    Op->Cop.Val = Val;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateCCOut(unsigned RegNum, SMLoc S) {
    auto Op = std::make_unique<ARMOperand>(k_CCOut);
    Op->Reg.RegNum = RegNum;
    Op->StartLoc = S;
    Op->EndLoc = S;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateToken(StringRef Str, SMLoc S) {
    auto Op = std::make_unique<ARMOperand>(k_Token);
    Op->Tok.Data = Str.data();
    Op->Tok.Length = Str.size();
    Op->StartLoc = S;
    Op->EndLoc = S;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateReg(unsigned RegNum, SMLoc S,
                                               SMLoc E) {
    auto Op = std::make_unique<ARMOperand>(k_Register);
    Op->Reg.RegNum = RegNum;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand>
  CreateShiftedRegister(ARM_AM::ShiftOpc ShTy, unsigned SrcReg,
                        unsigned ShiftReg, unsigned ShiftImm, SMLoc S,
                        SMLoc E) {
    auto Op = std::make_unique<ARMOperand>(k_ShiftedRegister);
    Op->RegShiftedReg.ShiftTy = ShTy;
    Op->RegShiftedReg.SrcReg = SrcReg;
    Op->RegShiftedReg.ShiftReg = ShiftReg;
    Op->RegShiftedReg.ShiftImm = ShiftImm;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand>
  CreateShiftedImmediate(ARM_AM::ShiftOpc ShTy, unsigned SrcReg,
                         unsigned ShiftImm, SMLoc S, SMLoc E) {
    auto Op = std::make_unique<ARMOperand>(k_ShiftedImmediate);
    Op->RegShiftedImm.ShiftTy = ShTy;
    Op->RegShiftedImm.SrcReg = SrcReg;
    Op->RegShiftedImm.ShiftImm = ShiftImm;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateShifterImm(bool isASR, unsigned Imm,
                                                      SMLoc S, SMLoc E) {
    auto Op = std::make_unique<ARMOperand>(k_ShifterImmediate);
    Op->ShifterImm.isASR = isASR;
    Op->ShifterImm.Imm = Imm;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateRotImm(unsigned Imm, SMLoc S,
                                                  SMLoc E) {
    auto Op = std::make_unique<ARMOperand>(k_RotateImmediate);
    Op->RotImm.Imm = Imm;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateModImm(unsigned Bits, unsigned Rot,
                                                  SMLoc S, SMLoc E) {
    auto Op = std::make_unique<ARMOperand>(k_ModifiedImmediate);
    Op->ModImm.Bits = Bits;
    Op->ModImm.Rot = Rot;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand>
  CreateConstantPoolImm(const MCExpr *Val, SMLoc S, SMLoc E) {
    auto Op = std::make_unique<ARMOperand>(k_ConstantPoolImmediate);
    Op->Imm.Val = Val;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand>
  CreateBitfield(unsigned LSB, unsigned Width, SMLoc S, SMLoc E) {
    auto Op = std::make_unique<ARMOperand>(k_BitfieldDescriptor);
    Op->Bitfield.LSB = LSB;
    Op->Bitfield.Width = Width;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand>
  CreateRegList(SmallVectorImpl<std::pair<unsigned, unsigned>> &Regs,
                SMLoc StartLoc, SMLoc EndLoc) {
    assert(Regs.size() > 0 && "RegList contains no registers?");
    KindTy Kind = k_RegisterList;
 
    if (ARMMCRegisterClasses[ARM::DPRRegClassID].contains(
            Regs.front().second)) {
      if (Regs.back().second == ARM::VPR)
        Kind = k_FPDRegisterListWithVPR;
      else
        Kind = k_DPRRegisterList;
    } else if (ARMMCRegisterClasses[ARM::SPRRegClassID].contains(
                   Regs.front().second)) {
      if (Regs.back().second == ARM::VPR)
        Kind = k_FPSRegisterListWithVPR;
      else
        Kind = k_SPRRegisterList;
    }
 
    if (Kind == k_RegisterList && Regs.back().second == ARM::APSR)
      Kind = k_RegisterListWithAPSR;
 
    assert(llvm::is_sorted(Regs) && "Register list must be sorted by encoding");
 
    auto Op = std::make_unique<ARMOperand>(Kind);
    for (const auto &P : Regs)
      Op->Registers.push_back(P.second);
 
    Op->StartLoc = StartLoc;
    Op->EndLoc = EndLoc;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateVectorList(unsigned RegNum,
                                                      unsigned Count,
                                                      bool isDoubleSpaced,
                                                      SMLoc S, SMLoc E) {
    auto Op = std::make_unique<ARMOperand>(k_VectorList);
    Op->VectorList.RegNum = RegNum;
    Op->VectorList.Count = Count;
    Op->VectorList.isDoubleSpaced = isDoubleSpaced;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand>
  CreateVectorListAllLanes(unsigned RegNum, unsigned Count, bool isDoubleSpaced,
                           SMLoc S, SMLoc E) {
    auto Op = std::make_unique<ARMOperand>(k_VectorListAllLanes);
    Op->VectorList.RegNum = RegNum;
    Op->VectorList.Count = Count;
    Op->VectorList.isDoubleSpaced = isDoubleSpaced;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand>
  CreateVectorListIndexed(unsigned RegNum, unsigned Count, unsigned Index,
                          bool isDoubleSpaced, SMLoc S, SMLoc E) {
    auto Op = std::make_unique<ARMOperand>(k_VectorListIndexed);
    Op->VectorList.RegNum = RegNum;
    Op->VectorList.Count = Count;
    Op->VectorList.LaneIndex = Index;
    Op->VectorList.isDoubleSpaced = isDoubleSpaced;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand>
  CreateVectorIndex(unsigned Idx, SMLoc S, SMLoc E, MCContext &Ctx) {
    auto Op = std::make_unique<ARMOperand>(k_VectorIndex);
    Op->VectorIndex.Val = Idx;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateImm(const MCExpr *Val, SMLoc S,
                                               SMLoc E) {
    auto Op = std::make_unique<ARMOperand>(k_Immediate);
    Op->Imm.Val = Val;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand>
  CreateMem(unsigned BaseRegNum, const MCExpr *OffsetImm, unsigned OffsetRegNum,
            ARM_AM::ShiftOpc ShiftType, unsigned ShiftImm, unsigned Alignment,
            bool isNegative, SMLoc S, SMLoc E, SMLoc AlignmentLoc = SMLoc()) {
    auto Op = std::make_unique<ARMOperand>(k_Memory);
    Op->Memory.BaseRegNum = BaseRegNum;
    Op->Memory.OffsetImm = OffsetImm;
    Op->Memory.OffsetRegNum = OffsetRegNum;
    Op->Memory.ShiftType = ShiftType;
    Op->Memory.ShiftImm = ShiftImm;
    Op->Memory.Alignment = Alignment;
    Op->Memory.isNegative = isNegative;
    Op->StartLoc = S;
    Op->EndLoc = E;
    Op->AlignmentLoc = AlignmentLoc;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand>
  CreatePostIdxReg(unsigned RegNum, bool isAdd, ARM_AM::ShiftOpc ShiftTy,
                   unsigned ShiftImm, SMLoc S, SMLoc E) {
    auto Op = std::make_unique<ARMOperand>(k_PostIndexRegister);
    Op->PostIdxReg.RegNum = RegNum;
    Op->PostIdxReg.isAdd = isAdd;
    Op->PostIdxReg.ShiftTy = ShiftTy;
    Op->PostIdxReg.ShiftImm = ShiftImm;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateMemBarrierOpt(ARM_MB::MemBOpt Opt,
                                                         SMLoc S) {
    auto Op = std::make_unique<ARMOperand>(k_MemBarrierOpt);
    Op->MBOpt.Val = Opt;
    Op->StartLoc = S;
    Op->EndLoc = S;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand>
  CreateInstSyncBarrierOpt(ARM_ISB::InstSyncBOpt Opt, SMLoc S) {
    auto Op = std::make_unique<ARMOperand>(k_InstSyncBarrierOpt);
    Op->ISBOpt.Val = Opt;
    Op->StartLoc = S;
    Op->EndLoc = S;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand>
  CreateTraceSyncBarrierOpt(ARM_TSB::TraceSyncBOpt Opt, SMLoc S) {
    auto Op = std::make_unique<ARMOperand>(k_TraceSyncBarrierOpt);
    Op->TSBOpt.Val = Opt;
    Op->StartLoc = S;
    Op->EndLoc = S;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateProcIFlags(ARM_PROC::IFlags IFlags,
                                                      SMLoc S) {
    auto Op = std::make_unique<ARMOperand>(k_ProcIFlags);
    Op->IFlags.Val = IFlags;
    Op->StartLoc = S;
    Op->EndLoc = S;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateMSRMask(unsigned MMask, SMLoc S) {
    auto Op = std::make_unique<ARMOperand>(k_MSRMask);
    Op->MMask.Val = MMask;
    Op->StartLoc = S;
    Op->EndLoc = S;
    return Op;
  }
 
  static std::unique_ptr<ARMOperand> CreateBankedReg(unsigned Reg, SMLoc S) {
    auto Op = std::make_unique<ARMOperand>(k_BankedReg);
    Op->BankedReg.Val = Reg;
    Op->StartLoc = S;
    Op->EndLoc = S;
    return Op;
  }
};
 
} // end anonymous namespace.
 
void ARMOperand::print(raw_ostream &OS) const {
  auto RegName = [](unsigned Reg) {
    if (Reg)
      return ARMInstPrinter::getRegisterName(Reg);
    else
      return "noreg";
  };
 
  switch (Kind) {
  case k_CondCode:
    OS << "<ARMCC::" << ARMCondCodeToString(getCondCode()) << ">";
    break;
  case k_VPTPred:
    OS << "<ARMVCC::" << ARMVPTPredToString(getVPTPred()) << ">";
    break;
  case k_CCOut:
    OS << "<ccout " << RegName(getReg()) << ">";
    break;
  case k_ITCondMask: {
    static const char *const MaskStr[] = {
      "(invalid)", "(tttt)", "(ttt)", "(ttte)",
      "(tt)",      "(ttet)", "(tte)", "(ttee)",
      "(t)",       "(tett)", "(tet)", "(tete)",
      "(te)",      "(teet)", "(tee)", "(teee)",
    };
    assert((ITMask.Mask & 0xf) == ITMask.Mask);
    OS << "<it-mask " << MaskStr[ITMask.Mask] << ">";
    break;
  }
  case k_CoprocNum:
    OS << "<coprocessor number: " << getCoproc() << ">";
    break;
  case k_CoprocReg:
    OS << "<coprocessor register: " << getCoproc() << ">";
    break;
  case k_CoprocOption:
    OS << "<coprocessor option: " << CoprocOption.Val << ">";
    break;
  case k_MSRMask:
    OS << "<mask: " << getMSRMask() << ">";
    break;
  case k_BankedReg:
    OS << "<banked reg: " << getBankedReg() << ">";
    break;
  case k_Immediate:
    OS << *getImm();
    break;
  case k_MemBarrierOpt:
    OS << "<ARM_MB::" << MemBOptToString(getMemBarrierOpt(), false) << ">";
    break;
  case k_InstSyncBarrierOpt:
    OS << "<ARM_ISB::" << InstSyncBOptToString(getInstSyncBarrierOpt()) << ">";
    break;
  case k_TraceSyncBarrierOpt:
    OS << "<ARM_TSB::" << TraceSyncBOptToString(getTraceSyncBarrierOpt()) << ">";
    break;
  case k_Memory:
    OS << "<memory";
    if (Memory.BaseRegNum)
      OS << " base:" << RegName(Memory.BaseRegNum);
    if (Memory.OffsetImm)
      OS << " offset-imm:" << *Memory.OffsetImm;
    if (Memory.OffsetRegNum)
      OS << " offset-reg:" << (Memory.isNegative ? "-" : "")
         << RegName(Memory.OffsetRegNum);
    if (Memory.ShiftType != ARM_AM::no_shift) {
      OS << " shift-type:" << ARM_AM::getShiftOpcStr(Memory.ShiftType);
      OS << " shift-imm:" << Memory.ShiftImm;
    }
    if (Memory.Alignment)
      OS << " alignment:" << Memory.Alignment;
    OS << ">";
    break;
  case k_PostIndexRegister:
    OS << "post-idx register " << (PostIdxReg.isAdd ? "" : "-")
       << RegName(PostIdxReg.RegNum);
    if (PostIdxReg.ShiftTy != ARM_AM::no_shift)
      OS << ARM_AM::getShiftOpcStr(PostIdxReg.ShiftTy) << " "
         << PostIdxReg.ShiftImm;
    OS << ">";
    break;
  case k_ProcIFlags: {
    OS << "<ARM_PROC::";
    unsigned IFlags = getProcIFlags();
    for (int i=2; i >= 0; --i)
      if (IFlags & (1 << i))
        OS << ARM_PROC::IFlagsToString(1 << i);
    OS << ">";
    break;
  }
  case k_Register:
    OS << "<register " << RegName(getReg()) << ">";
    break;
  case k_ShifterImmediate:
    OS << "<shift " << (ShifterImm.isASR ? "asr" : "lsl")
       << " #" << ShifterImm.Imm << ">";
    break;
  case k_ShiftedRegister:
    OS << "<so_reg_reg " << RegName(RegShiftedReg.SrcReg) << " "
       << ARM_AM::getShiftOpcStr(RegShiftedReg.ShiftTy) << " "
       << RegName(RegShiftedReg.ShiftReg) << ">";
    break;
  case k_ShiftedImmediate:
    OS << "<so_reg_imm " << RegName(RegShiftedImm.SrcReg) << " "
       << ARM_AM::getShiftOpcStr(RegShiftedImm.ShiftTy) << " #"
       << RegShiftedImm.ShiftImm << ">";
    break;
  case k_RotateImmediate:
    OS << "<ror " << " #" << (RotImm.Imm * 8) << ">";
    break;
  case k_ModifiedImmediate:
    OS << "<mod_imm #" << ModImm.Bits << ", #"
       <<  ModImm.Rot << ")>";
    break;
  case k_ConstantPoolImmediate:
    OS << "<constant_pool_imm #" << *getConstantPoolImm();
    break;
  case k_BitfieldDescriptor:
    OS << "<bitfield " << "lsb: " << Bitfield.LSB
       << ", width: " << Bitfield.Width << ">";
    break;
  case k_RegisterList:
  case k_RegisterListWithAPSR:
  case k_DPRRegisterList:
  case k_SPRRegisterList:
  case k_FPSRegisterListWithVPR:
  case k_FPDRegisterListWithVPR: {
    OS << "<register_list ";
 
    const SmallVectorImpl<unsigned> &RegList = getRegList();
    for (SmallVectorImpl<unsigned>::const_iterator
           I = RegList.begin(), E = RegList.end(); I != E; ) {
      OS << RegName(*I);
      if (++I < E) OS << ", ";
    }
 
    OS << ">";
    break;
  }
  case k_VectorList:
    OS << "<vector_list " << VectorList.Count << " * "
       << RegName(VectorList.RegNum) << ">";
    break;
  case k_VectorListAllLanes:
    OS << "<vector_list(all lanes) " << VectorList.Count << " * "
       << RegName(VectorList.RegNum) << ">";
    break;
  case k_VectorListIndexed:
    OS << "<vector_list(lane " << VectorList.LaneIndex << ") "
       << VectorList.Count << " * " << RegName(VectorList.RegNum) << ">";
    break;
  case k_Token:
    OS << "'" << getToken() << "'";
    break;
  case k_VectorIndex:
    OS << "<vectorindex " << getVectorIndex() << ">";
    break;
  }
}
 
/// @name Auto-generated Match Functions
/// {
 
static unsigned MatchRegisterName(StringRef Name);
 
/// }
 
bool ARMAsmParser::ParseRegister(unsigned &RegNo,
                                 SMLoc &StartLoc, SMLoc &EndLoc) {
  const AsmToken &Tok = getParser().getTok();
  StartLoc = Tok.getLoc();
  EndLoc = Tok.getEndLoc();
  RegNo = tryParseRegister();
 
  return (RegNo == (unsigned)-1);
}
 
OperandMatchResultTy ARMAsmParser::tryParseRegister(unsigned &RegNo,
                                                    SMLoc &StartLoc,
                                                    SMLoc &EndLoc) {
  if (ParseRegister(RegNo, StartLoc, EndLoc))
    return MatchOperand_NoMatch;
  return MatchOperand_Success;
}
 
/// Try to parse a register name.  The token must be an Identifier when called,
/// and if it is a register name the token is eaten and the register number is
/// returned.  Otherwise return -1.
int ARMAsmParser::tryParseRegister() {
  MCAsmParser &Parser = getParser();
  const AsmToken &Tok = Parser.getTok();
  if (Tok.isNot(AsmToken::Identifier)) return -1;
 
  std::string lowerCase = Tok.getString().lower();
  unsigned RegNum = MatchRegisterName(lowerCase);
  if (!RegNum) {
    RegNum = StringSwitch<unsigned>(lowerCase)
      .Case("r13", ARM::SP)
      .Case("r14", ARM::LR)
      .Case("r15", ARM::PC)
      .Case("ip", ARM::R12)
      // Additional register name aliases for 'gas' compatibility.
      .Case("a1", ARM::R0)
      .Case("a2", ARM::R1)
      .Case("a3", ARM::R2)
      .Case("a4", ARM::R3)
      .Case("v1", ARM::R4)
      .Case("v2", ARM::R5)
      .Case("v3", ARM::R6)
      .Case("v4", ARM::R7)
      .Case("v5", ARM::R8)
      .Case("v6", ARM::R9)
      .Case("v7", ARM::R10)
      .Case("v8", ARM::R11)
      .Case("sb", ARM::R9)
      .Case("sl", ARM::R10)
      .Case("fp", ARM::R11)
      .Default(0);
  }
  if (!RegNum) {
    // Check for aliases registered via .req. Canonicalize to lower case.
    // That's more consistent since register names are case insensitive, and
    // it's how the original entry was passed in from MC/MCParser/AsmParser.
    StringMap<unsigned>::const_iterator Entry = RegisterReqs.find(lowerCase);
    // If no match, return failure.
    if (Entry == RegisterReqs.end())
      return -1;
    Parser.Lex(); // Eat identifier token.
    return Entry->getValue();
  }
 
  // Some FPUs only have 16 D registers, so D16-D31 are invalid
  if (!hasD32() && RegNum >= ARM::D16 && RegNum <= ARM::D31)
    return -1;
 
  Parser.Lex(); // Eat identifier token.
 
  return RegNum;
}
 
// Try to parse a shifter  (e.g., "lsl <amt>"). On success, return 0.
// If a recoverable error occurs, return 1. If an irrecoverable error
// occurs, return -1. An irrecoverable error is one where tokens have been
// consumed in the process of trying to parse the shifter (i.e., when it is
// indeed a shifter operand, but malformed).
int ARMAsmParser::tryParseShiftRegister(OperandVector &Operands) {
  MCAsmParser &Parser = getParser();
  SMLoc S = Parser.getTok().getLoc();
  const AsmToken &Tok = Parser.getTok();
  if (Tok.isNot(AsmToken::Identifier))
    return -1;
 
  std::string lowerCase = Tok.getString().lower();
  ARM_AM::ShiftOpc ShiftTy = StringSwitch<ARM_AM::ShiftOpc>(lowerCase)
      .Case("asl", ARM_AM::lsl)
      .Case("lsl", ARM_AM::lsl)
      .Case("lsr", ARM_AM::lsr)
      .Case("asr", ARM_AM::asr)
      .Case("ror", ARM_AM::ror)
      .Case("rrx", ARM_AM::rrx)
      .Default(ARM_AM::no_shift);
 
  if (ShiftTy == ARM_AM::no_shift)
    return 1;
 
  Parser.Lex(); // Eat the operator.
 
  // The source register for the shift has already been added to the
  // operand list, so we need to pop it off and combine it into the shifted
  // register operand instead.
  std::unique_ptr<ARMOperand> PrevOp(
      (ARMOperand *)Operands.pop_back_val().release());
  if (!PrevOp->isReg())
    return Error(PrevOp->getStartLoc(), "shift must be of a register");
  int SrcReg = PrevOp->getReg();
 
  SMLoc EndLoc;
  int64_t Imm = 0;
  int ShiftReg = 0;
  if (ShiftTy == ARM_AM::rrx) {
    // RRX Doesn't have an explicit shift amount. The encoder expects
    // the shift register to be the same as the source register. Seems odd,
    // but OK.
    ShiftReg = SrcReg;
  } else {
    // Figure out if this is shifted by a constant or a register (for non-RRX).
    if (Parser.getTok().is(AsmToken::Hash) ||
        Parser.getTok().is(AsmToken::Dollar)) {
      Parser.Lex(); // Eat hash.
      SMLoc ImmLoc = Parser.getTok().getLoc();
      const MCExpr *ShiftExpr = nullptr;
      if (getParser().parseExpression(ShiftExpr, EndLoc)) {
        Error(ImmLoc, "invalid immediate shift value");
        return -1;
      }
      // The expression must be evaluatable as an immediate.
      const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(ShiftExpr);
      if (!CE) {
        Error(ImmLoc, "invalid immediate shift value");
        return -1;
      }
      // Range check the immediate.
      // lsl, ror: 0 <= imm <= 31
      // lsr, asr: 0 <= imm <= 32
      Imm = CE->getValue();
      if (Imm < 0 ||
          ((ShiftTy == ARM_AM::lsl || ShiftTy == ARM_AM::ror) && Imm > 31) ||
          ((ShiftTy == ARM_AM::lsr || ShiftTy == ARM_AM::asr) && Imm > 32)) {
        Error(ImmLoc, "immediate shift value out of range");
        return -1;
      }
      // shift by zero is a nop. Always send it through as lsl.
      // ('as' compatibility)
      if (Imm == 0)
        ShiftTy = ARM_AM::lsl;
    } else if (Parser.getTok().is(AsmToken::Identifier)) {
      SMLoc L = Parser.getTok().getLoc();
      EndLoc = Parser.getTok().getEndLoc();
      ShiftReg = tryParseRegister();
      if (ShiftReg == -1) {
        Error(L, "expected immediate or register in shift operand");
        return -1;
      }
    } else {
      Error(Parser.getTok().getLoc(),
            "expected immediate or register in shift operand");
      return -1;
    }
  }
 
  if (ShiftReg && ShiftTy != ARM_AM::rrx)
    Operands.push_back(ARMOperand::CreateShiftedRegister(ShiftTy, SrcReg,
                                                         ShiftReg, Imm,
                                                         S, EndLoc));
  else
    Operands.push_back(ARMOperand::CreateShiftedImmediate(ShiftTy, SrcReg, Imm,
                                                          S, EndLoc));
 
  return 0;
}
 
/// Try to parse a register name.  The token must be an Identifier when called.
/// If it's a register, an AsmOperand is created. Another AsmOperand is created
/// if there is a "writeback". 'true' if it's not a register.
///
/// TODO this is likely to change to allow different register types and or to
/// parse for a specific register type.
bool ARMAsmParser::tryParseRegisterWithWriteBack(OperandVector &Operands) {
  MCAsmParser &Parser = getParser();
  SMLoc RegStartLoc = Parser.getTok().getLoc();
  SMLoc RegEndLoc = Parser.getTok().getEndLoc();
  int RegNo = tryParseRegister();
  if (RegNo == -1)
    return true;
 
  Operands.push_back(ARMOperand::CreateReg(RegNo, RegStartLoc, RegEndLoc));
 
  const AsmToken &ExclaimTok = Parser.getTok();
  if (ExclaimTok.is(AsmToken::Exclaim)) {
    Operands.push_back(ARMOperand::CreateToken(ExclaimTok.getString(),
                                               ExclaimTok.getLoc()));
    Parser.Lex(); // Eat exclaim token
    return false;
  }
 
  // Also check for an index operand. This is only legal for vector registers,
  // but that'll get caught OK in operand matching, so we don't need to
  // explicitly filter everything else out here.
  if (Parser.getTok().is(AsmToken::LBrac)) {
    SMLoc SIdx = Parser.getTok().getLoc();
    Parser.Lex(); // Eat left bracket token.
 
    const MCExpr *ImmVal;
    if (getParser().parseExpression(ImmVal))
      return true;
    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(ImmVal);
    if (!MCE)
      return TokError("immediate value expected for vector index");
 
    if (Parser.getTok().isNot(AsmToken::RBrac))
      return Error(Parser.getTok().getLoc(), "']' expected");
 
    SMLoc E = Parser.getTok().getEndLoc();
    Parser.Lex(); // Eat right bracket token.
 
    Operands.push_back(ARMOperand::CreateVectorIndex(MCE->getValue(),
                                                     SIdx, E,
                                                     getContext()));
  }
 
  return false;
}
 
/// MatchCoprocessorOperandName - Try to parse an coprocessor related
/// instruction with a symbolic operand name.
/// We accept "crN" syntax for GAS compatibility.
/// <operand-name> ::= <prefix><number>
/// If CoprocOp is 'c', then:
///   <prefix> ::= c | cr
/// If CoprocOp is 'p', then :
///   <prefix> ::= p
/// <number> ::= integer in range [0, 15]
static int MatchCoprocessorOperandName(StringRef Name, char CoprocOp) {
  // Use the same layout as the tablegen'erated register name matcher. Ugly,
  // but efficient.
  if (Name.size() < 2 || Name[0] != CoprocOp)
    return -1;
  Name = (Name[1] == 'r') ? Name.drop_front(2) : Name.drop_front();
 
  switch (Name.size()) {
  default: return -1;
  case 1:
    switch (Name[0]) {
    default:  return -1;
    case '0': return 0;
    case '1': return 1;
    case '2': return 2;
    case '3': return 3;
    case '4': return 4;
    case '5': return 5;
    case '6': return 6;
    case '7': return 7;
    case '8': return 8;
    case '9': return 9;
    }
  case 2:
    if (Name[0] != '1')
      return -1;
    switch (Name[1]) {
    default:  return -1;
    // CP10 and CP11 are VFP/NEON and so vector instructions should be used.
    // However, old cores (v5/v6) did use them in that way.
    case '0': return 10;
    case '1': return 11;
    case '2': return 12;
    case '3': return 13;
    case '4': return 14;
    case '5': return 15;
    }
  }
}
 
/// parseITCondCode - Try to parse a condition code for an IT instruction.
OperandMatchResultTy
ARMAsmParser::parseITCondCode(OperandVector &Operands) {
  MCAsmParser &Parser = getParser();
  SMLoc S = Parser.getTok().getLoc();
  const AsmToken &Tok = Parser.getTok();
  if (!Tok.is(AsmToken::Identifier))
    return MatchOperand_NoMatch;
  unsigned CC = ARMCondCodeFromString(Tok.getString());
  if (CC == ~0U)
    return MatchOperand_NoMatch;
  Parser.Lex(); // Eat the token.
 
  Operands.push_back(ARMOperand::CreateCondCode(ARMCC::CondCodes(CC), S));
 
  return MatchOperand_Success;
}
 
/// parseCoprocNumOperand - Try to parse an coprocessor number operand. The
/// token must be an Identifier when called, and if it is a coprocessor
/// number, the token is eaten and the operand is added to the operand list.
OperandMatchResultTy
ARMAsmParser::parseCoprocNumOperand(OperandVector &Operands) {
  MCAsmParser &Parser = getParser();
  SMLoc S = Parser.getTok().getLoc();
  const AsmToken &Tok = Parser.getTok();
  if (Tok.isNot(AsmToken::Identifier))
    return MatchOperand_NoMatch;
 
  int Num = MatchCoprocessorOperandName(Tok.getString().lower(), 'p');
  if (Num == -1)
    return MatchOperand_NoMatch;
  if (!isValidCoprocessorNumber(Num, getSTI().getFeatureBits()))
    return MatchOperand_NoMatch;
 
  Parser.Lex(); // Eat identifier token.
  Operands.push_back(ARMOperand::CreateCoprocNum(Num, S));
  return MatchOperand_Success;
}
 
/// parseCoprocRegOperand - Try to parse an coprocessor register operand. The
/// token must be an Identifier when called, and if it is a coprocessor
/// number, the token is eaten and the operand is added to the operand list.
OperandMatchResultTy
ARMAsmParser::parseCoprocRegOperand(OperandVector &Operands) {
  MCAsmParser &Parser = getParser();
  SMLoc S = Parser.getTok().getLoc();
  const AsmToken &Tok = Parser.getTok();
  if (Tok.isNot(AsmToken::Identifier))
    return MatchOperand_NoMatch;
 
  int Reg = MatchCoprocessorOperandName(Tok.getString().lower(), 'c');
  if (Reg == -1)
    return MatchOperand_NoMatch;
 
  Parser.Lex(); // Eat identifier token.
  Operands.push_back(ARMOperand::CreateCoprocReg(Reg, S));
  return MatchOperand_Success;
}
 
/// parseCoprocOptionOperand - Try to parse an coprocessor option operand.
/// coproc_option : '{' imm0_255 '}'
OperandMatchResultTy
ARMAsmParser::parseCoprocOptionOperand(OperandVector &Operands) {
  MCAsmParser &Parser = getParser();
  SMLoc S = Parser.getTok().getLoc();
 
  // If this isn't a '{', this isn't a coprocessor immediate operand.
  if (Parser.getTok().isNot(AsmToken::LCurly))
    return MatchOperand_NoMatch;
  Parser.Lex(); // Eat the '{'
 
  const MCExpr *Expr;
  SMLoc Loc = Parser.getTok().getLoc();
  if (getParser().parseExpression(Expr)) {
    Error(Loc, "illegal expression");
    return MatchOperand_ParseFail;
  }
  const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Expr);
  if (!CE || CE->getValue() < 0 || CE->getValue() > 255) {
    Error(Loc, "coprocessor option must be an immediate in range [0, 255]");
    return MatchOperand_ParseFail;
  }
  int Val = CE->getValue();
 
  // Check for and consume the closing '}'
  if (Parser.getTok().isNot(AsmToken::RCurly))
    return MatchOperand_ParseFail;
  SMLoc E = Parser.getTok().getEndLoc();
  Parser.Lex(); // Eat the '}'
 
  Operands.push_back(ARMOperand::CreateCoprocOption(Val, S, E));
  return MatchOperand_Success;
}
 
// For register list parsing, we need to map from raw GPR register numbering
// to the enumeration values. The enumeration values aren't sorted by
// register number due to our using "sp", "lr" and "pc" as canonical names.
static unsigned getNextRegister(unsigned Reg) {
  // If this is a GPR, we need to do it manually, otherwise we can rely
  // on the sort ordering of the enumeration since the other reg-classes
  // are sane.
  if (!ARMMCRegisterClasses[ARM::GPRRegClassID].contains(Reg))
    return Reg + 1;
  switch(Reg) {
  default: llvm_unreachable("Invalid GPR number!");
  case ARM::R0:  return ARM::R1;  case ARM::R1:  return ARM::R2;
  case ARM::R2:  return ARM::R3;  case ARM::R3:  return ARM::R4;
  case ARM::R4:  return ARM::R5;  case ARM::R5:  return ARM::R6;
  case ARM::R6:  return ARM::R7;  case ARM::R7:  return ARM::R8;
  case ARM::R8:  return ARM::R9;  case ARM::R9:  return ARM::R10;
  case ARM::R10: return ARM::R11; case ARM::R11: return ARM::R12;
  case ARM::R12: return ARM::SP;  case ARM::SP:  return ARM::LR;
  case ARM::LR:  return ARM::PC;  case ARM::PC:  return ARM::R0;
  }
}
 
// Insert an <Encoding, Register> pair in an ordered vector. Return true on
// success, or false, if duplicate encoding found.
static bool
insertNoDuplicates(SmallVectorImpl<std::pair<unsigned, unsigned>> &Regs,
                   unsigned Enc, unsigned Reg) {
  Regs.emplace_back(Enc, Reg);
  for (auto I = Regs.rbegin(), J = I + 1, E = Regs.rend(); J != E; ++I, ++J) {
    if (J->first == Enc) {
      Regs.erase(J.base());
      return false;
    }
    if (J->first < Enc)
      break;
    std::swap(*I, *J);
  }
  return true;
}
 
/// Parse a register list.
bool ARMAsmParser::parseRegisterList(OperandVector &Operands, bool EnforceOrder,
                                     bool AllowRAAC) {
  MCAsmParser &Parser = getParser();
  if (Parser.getTok().isNot(AsmToken::LCurly))
    return TokError("Token is not a Left Curly Brace");
  SMLoc S = Parser.getTok().getLoc();
  Parser.Lex(); // Eat '{' token.
  SMLoc RegLoc = Parser.getTok().getLoc();
 
  // Check the first register in the list to see what register class
  // this is a list of.
  int Reg = tryParseRegister();
  if (Reg == -1)
    return Error(RegLoc, "register expected");
  if (!AllowRAAC && Reg == ARM::RA_AUTH_CODE)
    return Error(RegLoc, "pseudo-register not allowed");
  // The reglist instructions have at most 16 registers, so reserve
  // space for that many.
  int EReg = 0;
  SmallVector<std::pair<unsigned, unsigned>, 16> Registers;
 
  // Allow Q regs and just interpret them as the two D sub-registers.
  if (ARMMCRegisterClasses[ARM::QPRRegClassID].contains(Reg)) {
    Reg = getDRegFromQReg(Reg);
    EReg = MRI->getEncodingValue(Reg);
    Registers.emplace_back(EReg, Reg);
    ++Reg;
  }
  const MCRegisterClass *RC;
  if (Reg == ARM::RA_AUTH_CODE ||
      ARMMCRegisterClasses[ARM::GPRRegClassID].contains(Reg))
    RC = &ARMMCRegisterClasses[ARM::GPRRegClassID];
  else if (ARMMCRegisterClasses[ARM::DPRRegClassID].contains(Reg))
    RC = &ARMMCRegisterClasses[ARM::DPRRegClassID];
  else if (ARMMCRegisterClasses[ARM::SPRRegClassID].contains(Reg))
    RC = &ARMMCRegisterClasses[ARM::SPRRegClassID];
  else if (ARMMCRegisterClasses[ARM::GPRwithAPSRnospRegClassID].contains(Reg))
    RC = &ARMMCRegisterClasses[ARM::GPRwithAPSRnospRegClassID];
  else
    return Error(RegLoc, "invalid register in register list");
 
  // Store the register.
  EReg = MRI->getEncodingValue(Reg);
  Registers.emplace_back(EReg, Reg);
 
  // This starts immediately after the first register token in the list,
  // so we can see either a comma or a minus (range separator) as a legal
  // next token.
  while (Parser.getTok().is(AsmToken::Comma) ||
         Parser.getTok().is(AsmToken::Minus)) {
    if (Parser.getTok().is(AsmToken::Minus)) {
      if (Reg == ARM::RA_AUTH_CODE)
        return Error(RegLoc, "pseudo-register not allowed");
      Parser.Lex(); // Eat the minus.
      SMLoc AfterMinusLoc = Parser.getTok().getLoc();
      int EndReg = tryParseRegister();
      if (EndReg == -1)
        return Error(AfterMinusLoc, "register expected");
      if (EndReg == ARM::RA_AUTH_CODE)
        return Error(AfterMinusLoc, "pseudo-register not allowed");
      // Allow Q regs and just interpret them as the two D sub-registers.
      if (ARMMCRegisterClasses[ARM::QPRRegClassID].contains(EndReg))
        EndReg = getDRegFromQReg(EndReg) + 1;
      // If the register is the same as the start reg, there's nothing
      // more to do.
      if (Reg == EndReg)
        continue;
      // The register must be in the same register class as the first.
      if (!RC->contains(Reg))
        return Error(AfterMinusLoc, "invalid register in register list");
      // Ranges must go from low to high.
      if (MRI->getEncodingValue(Reg) > MRI->getEncodingValue(EndReg))
        return Error(AfterMinusLoc, "bad range in register list");
 
      // Add all the registers in the range to the register list.
      while (Reg != EndReg) {
        Reg = getNextRegister(Reg);
        EReg = MRI->getEncodingValue(Reg);
        if (!insertNoDuplicates(Registers, EReg, Reg)) {
          Warning(AfterMinusLoc, StringRef("duplicated register (") +
                                     ARMInstPrinter::getRegisterName(Reg) +
                                     ") in register list");
        }
      }
      continue;
    }
    Parser.Lex(); // Eat the comma.
    RegLoc = Parser.getTok().getLoc();
    int OldReg = Reg;
    const AsmToken RegTok = Parser.getTok();
    Reg = tryParseRegister();
    if (Reg == -1)
      return Error(RegLoc, "register expected");
    if (!AllowRAAC && Reg == ARM::RA_AUTH_CODE)
      return Error(RegLoc, "pseudo-register not allowed");
    // Allow Q regs and just interpret them as the two D sub-registers.
    bool isQReg = false;
    if (ARMMCRegisterClasses[ARM::QPRRegClassID].contains(Reg)) {
      Reg = getDRegFromQReg(Reg);
      isQReg = true;
    }
    if (Reg != ARM::RA_AUTH_CODE && !RC->contains(Reg) &&
        RC->getID() == ARMMCRegisterClasses[ARM::GPRRegClassID].getID() &&
        ARMMCRegisterClasses[ARM::GPRwithAPSRnospRegClassID].contains(Reg)) {
      // switch the register classes, as GPRwithAPSRnospRegClassID is a partial
      // subset of GPRRegClassId except it contains APSR as well.
      RC = &ARMMCRegisterClasses[ARM::GPRwithAPSRnospRegClassID];
    }
    if (Reg == ARM::VPR &&
        (RC == &ARMMCRegisterClasses[ARM::SPRRegClassID] ||
         RC == &ARMMCRegisterClasses[ARM::DPRRegClassID] ||
         RC == &ARMMCRegisterClasses[ARM::FPWithVPRRegClassID])) {
      RC = &ARMMCRegisterClasses[ARM::FPWithVPRRegClassID];
      EReg = MRI->getEncodingValue(Reg);
      if (!insertNoDuplicates(Registers, EReg, Reg)) {
        Warning(RegLoc, "duplicated register (" + RegTok.getString() +
                            ") in register list");
      }
      continue;
    }
    // The register must be in the same register class as the first.
    if ((Reg == ARM::RA_AUTH_CODE &&
         RC != &ARMMCRegisterClasses[ARM::GPRRegClassID]) ||
        (Reg != ARM::RA_AUTH_CODE && !RC->contains(Reg)))
      return Error(RegLoc, "invalid register in register list");
    // In most cases, the list must be monotonically increasing. An
    // exception is CLRM, which is order-independent anyway, so
    // there's no potential for confusion if you write clrm {r2,r1}
    // instead of clrm {r1,r2}.
    if (EnforceOrder &&
        MRI->getEncodingValue(Reg) < MRI->getEncodingValue(OldReg)) {
      if (ARMMCRegisterClasses[ARM::GPRRegClassID].contains(Reg))
        Warning(RegLoc, "register list not in ascending order");
      else if (!ARMMCRegisterClasses[ARM::GPRwithAPSRnospRegClassID].contains(Reg))
        return Error(RegLoc, "register list not in ascending order");
    }
    // VFP register lists must also be contiguous.
    if (RC != &ARMMCRegisterClasses[ARM::GPRRegClassID] &&
        RC != &ARMMCRegisterClasses[ARM::GPRwithAPSRnospRegClassID] &&
        Reg != OldReg + 1)
      return Error(RegLoc, "non-contiguous register range");
    EReg = MRI->getEncodingValue(Reg);
    if (!insertNoDuplicates(Registers, EReg, Reg)) {
      Warning(RegLoc, "duplicated register (" + RegTok.getString() +
                          ") in register list");
    }
    if (isQReg) {
      EReg = MRI->getEncodingValue(++Reg);
      Registers.emplace_back(EReg, Reg);
    }
  }
 
  if (Parser.getTok().isNot(AsmToken::RCurly))
    return Error(Parser.getTok().getLoc(), "'}' expected");
  SMLoc E = Parser.getTok().getEndLoc();
  Parser.Lex(); // Eat '}' token.
 
  // Push the register list operand.
  Operands.push_back(ARMOperand::CreateRegList(Registers, S, E));
 
  // The ARM system instruction variants for LDM/STM have a '^' token here.
  if (Parser.getTok().is(AsmToken::Caret)) {
    Operands.push_back(ARMOperand::CreateToken("^",Parser.getTok().getLoc()));
    Parser.Lex(); // Eat '^' token.
  }
 
  return false;
}
 
// Helper function to parse the lane index for vector lists.
OperandMatchResultTy ARMAsmParser::
parseVectorLane(VectorLaneTy &LaneKind, unsigned &Index, SMLoc &EndLoc) {
  MCAsmParser &Parser = getParser();
  Index = 0; // Always return a defined index value.
  if (Parser.getTok().is(AsmToken::LBrac)) {
    Parser.Lex(); // Eat the '['.
    if (Parser.getTok().is(AsmToken::RBrac)) {
      // "Dn[]" is the 'all lanes' syntax.
      LaneKind = AllLanes;
      EndLoc = Parser.getTok().getEndLoc();
      Parser.Lex(); // Eat the ']'.
      return MatchOperand_Success;
    }
 
    // There's an optional '#' token here. Normally there wouldn't be, but
    // inline assemble puts one in, and it's friendly to accept that.
    if (Parser.getTok().is(AsmToken::Hash))
      Parser.Lex(); // Eat '#' or '$'.
 
    const MCExpr *LaneIndex;
    SMLoc Loc = Parser.getTok().getLoc();
    if (getParser().parseExpression(LaneIndex)) {
      Error(Loc, "illegal expression");
      return MatchOperand_ParseFail;
    }
    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(LaneIndex);
    if (!CE) {
      Error(Loc, "lane index must be empty or an integer");
      return MatchOperand_ParseFail;
    }
    if (Parser.getTok().isNot(AsmToken::RBrac)) {
      Error(Parser.getTok().getLoc(), "']' expected");
      return MatchOperand_ParseFail;
    }
    EndLoc = Parser.getTok().getEndLoc();
    Parser.Lex(); // Eat the ']'.
    int64_t Val = CE->getValue();
 
    // FIXME: Make this range check context sensitive for .8, .16, .32.
    if (Val < 0 || Val > 7) {
      Error(Parser.getTok().getLoc(), "lane index out of range");
      return MatchOperand_ParseFail;
    }
    Index = Val;
    LaneKind = IndexedLane;
    return MatchOperand_Success;
  }
  LaneKind = NoLanes;
  return MatchOperand_Success;
}
 
// parse a vector register list
OperandMatchResultTy
ARMAsmParser::parseVectorList(OperandVector &Operands) {
  MCAsmParser &Parser = getParser();
  VectorLaneTy LaneKind;
  unsigned LaneIndex;
  SMLoc S = Parser.getTok().getLoc();
  // As an extension (to match gas), support a plain D register or Q register
  // (without encosing curly braces) as a single or double entry list,
  // respectively.
  if (!hasMVE() && Parser.getTok().is(AsmToken::Identifier)) {
    SMLoc E = Parser.getTok().getEndLoc();
    int Reg = tryParseRegister();
    if (Reg == -1)
      return MatchOperand_NoMatch;
    if (ARMMCRegisterClasses[ARM::DPRRegClassID].contains(Reg)) {
      OperandMatchResultTy Res = parseVectorLane(LaneKind, LaneIndex, E);
      if (Res != MatchOperand_Success)
        return Res;
      switch (LaneKind) {
      case NoLanes:
        Operands.push_back(ARMOperand::CreateVectorList(Reg, 1, false, S, E));
        break;
      case AllLanes:
        Operands.push_back(ARMOperand::CreateVectorListAllLanes(Reg, 1, false,
                                                                S, E));
        break;
      case IndexedLane:
        Operands.push_back(ARMOperand::CreateVectorListIndexed(Reg, 1,
                                                               LaneIndex,
                                                               false, S, E));
        break;
      }
      return MatchOperand_Success;
    }
    if (ARMMCRegisterClasses[ARM::QPRRegClassID].contains(Reg)) {
      Reg = getDRegFromQReg(Reg);
      OperandMatchResultTy Res = parseVectorLane(LaneKind, LaneIndex, E);
      if (Res != MatchOperand_Success)
        return Res;
      switch (LaneKind) {
      case NoLanes:
        Reg = MRI->getMatchingSuperReg(Reg, ARM::dsub_0,
                                   &ARMMCRegisterClasses[ARM::DPairRegClassID]);
        Operands.push_back(ARMOperand::CreateVectorList(Reg, 2, false, S, E));
        break;
      case AllLanes:
        Reg = MRI->getMatchingSuperReg(Reg, ARM::dsub_0,
                                   &ARMMCRegisterClasses[ARM::DPairRegClassID]);
        Operands.push_back(ARMOperand::CreateVectorListAllLanes(Reg, 2, false,
                                                                S, E));
        break;
      case IndexedLane:
        Operands.push_back(ARMOperand::CreateVectorListIndexed(Reg, 2,
                                                               LaneIndex,
                                                               false, S, E));
        break;
      }
      return MatchOperand_Success;
    }
    Error(S, "vector register expected");
    return MatchOperand_ParseFail;
  }
 
  if (Parser.getTok().isNot(AsmToken::LCurly))
    return MatchOperand_NoMatch;
 
  Parser.Lex(); // Eat '{' token.
  SMLoc RegLoc = Parser.getTok().getLoc();
 
  int Reg = tryParseRegister();
  if (Reg == -1) {
    Error(RegLoc, "register expected");
    return MatchOperand_ParseFail;
  }
  unsigned Count = 1;
  int Spacing = 0;
  unsigned FirstReg = Reg;
 
  if (hasMVE() && !ARMMCRegisterClasses[ARM::MQPRRegClassID].contains(Reg)) {
      Error(Parser.getTok().getLoc(), "vector register in range Q0-Q7 expected");
      return MatchOperand_ParseFail;
  }
  // The list is of D registers, but we also allow Q regs and just interpret
  // them as the two D sub-registers.
  else if (!hasMVE() && ARMMCRegisterClasses[ARM::QPRRegClassID].contains(Reg)) {
    FirstReg = Reg = getDRegFromQReg(Reg);
    Spacing = 1; // double-spacing requires explicit D registers, otherwise
                 // it's ambiguous with four-register single spaced.
    ++Reg;
    ++Count;
  }
 
  SMLoc E;
  if (parseVectorLane(LaneKind, LaneIndex, E) != MatchOperand_Success)
    return MatchOperand_ParseFail;
 
  while (Parser.getTok().is(AsmToken::Comma) ||
         Parser.getTok().is(AsmToken::Minus)) {
    if (Parser.getTok().is(AsmToken::Minus)) {
      if (!Spacing)
        Spacing = 1; // Register range implies a single spaced list.
      else if (Spacing == 2) {
        Error(Parser.getTok().getLoc(),
              "sequential registers in double spaced list");
        return MatchOperand_ParseFail;
      }
      Parser.Lex(); // Eat the minus.
      SMLoc AfterMinusLoc = Parser.getTok().getLoc();
      int EndReg = tryParseRegister();
      if (EndReg == -1) {
        Error(AfterMinusLoc, "register expected");
        return MatchOperand_ParseFail;
      }
      // Allow Q regs and just interpret them as the two D sub-registers.
      if (!hasMVE() && ARMMCRegisterClasses[ARM::QPRRegClassID].contains(EndReg))
        EndReg = getDRegFromQReg(EndReg) + 1;
      // If the register is the same as the start reg, there's nothing
      // more to do.
      if (Reg == EndReg)
        continue;
      // The register must be in the same register class as the first.
      if ((hasMVE() &&
           !ARMMCRegisterClasses[ARM::MQPRRegClassID].contains(EndReg)) ||
          (!hasMVE() &&
           !ARMMCRegisterClasses[ARM::DPRRegClassID].contains(EndReg))) {
        Error(AfterMinusLoc, "invalid register in register list");
        return MatchOperand_ParseFail;
      }
      // Ranges must go from low to high.
      if (Reg > EndReg) {
        Error(AfterMinusLoc, "bad range in register list");
        return MatchOperand_ParseFail;
      }
      // Parse the lane specifier if present.
      VectorLaneTy NextLaneKind;
      unsigned NextLaneIndex;
      if (parseVectorLane(NextLaneKind, NextLaneIndex, E) !=
          MatchOperand_Success)
        return MatchOperand_ParseFail;
      if (NextLaneKind != LaneKind || LaneIndex != NextLaneIndex) {
        Error(AfterMinusLoc, "mismatched lane index in register list");
        return MatchOperand_ParseFail;
      }
 
      // Add all the registers in the range to the register list.
      Count += EndReg - Reg;
      Reg = EndReg;
      continue;
    }
    Parser.Lex(); // Eat the comma.
    RegLoc = Parser.getTok().getLoc();
    int OldReg = Reg;
    Reg = tryParseRegister();
    if (Reg == -1) {
      Error(RegLoc, "register expected");
      return MatchOperand_ParseFail;
    }
 
    if (hasMVE()) {
      if (!ARMMCRegisterClasses[ARM::MQPRRegClassID].contains(Reg)) {
        Error(RegLoc, "vector register in range Q0-Q7 expected");
        return MatchOperand_ParseFail;
      }
      Spacing = 1;
    }
    // vector register lists must be contiguous.
    // It's OK to use the enumeration values directly here rather, as the
    // VFP register classes have the enum sorted properly.
    //
    // The list is of D registers, but we also allow Q regs and just interpret
    // them as the two D sub-registers.
    else if (ARMMCRegisterClasses[ARM::QPRRegClassID].contains(Reg)) {
      if (!Spacing)
        Spacing = 1; // Register range implies a single spaced list.
      else if (Spacing == 2) {
        Error(RegLoc,
              "invalid register in double-spaced list (must be 'D' register')");
        return MatchOperand_ParseFail;
      }
      Reg = getDRegFromQReg(Reg);
      if (Reg != OldReg + 1) {
        Error(RegLoc, "non-contiguous register range");
        return MatchOperand_ParseFail;
      }
      ++Reg;
      Count += 2;
      // Parse the lane specifier if present.
      VectorLaneTy NextLaneKind;
      unsigned NextLaneIndex;
      SMLoc LaneLoc = Parser.getTok().getLoc();
      if (parseVectorLane(NextLaneKind, NextLaneIndex, E) !=
          MatchOperand_Success)
        return MatchOperand_ParseFail;
      if (NextLaneKind != LaneKind || LaneIndex != NextLaneIndex) {
        Error(LaneLoc, "mismatched lane index in register list");
        return MatchOperand_ParseFail;
      }
      continue;
    }
    // Normal D register.
    // Figure out the register spacing (single or double) of the list if
    // we don't know it already.
    if (!Spacing)
      Spacing = 1 + (Reg == OldReg + 2);
 
    // Just check that it's contiguous and keep going.
    if (Reg != OldReg + Spacing) {
      Error(RegLoc, "non-contiguous register range");
      return MatchOperand_ParseFail;
    }
    ++Count;
    // Parse the lane specifier if present.
    VectorLaneTy NextLaneKind;
    unsigned NextLaneIndex;
    SMLoc EndLoc = Parser.getTok().getLoc();
    if (parseVectorLane(NextLaneKind, NextLaneIndex, E) != MatchOperand_Success)
      return MatchOperand_ParseFail;
    if (NextLaneKind != LaneKind || LaneIndex != NextLaneIndex) {
      Error(EndLoc, "mismatched lane index in register list");
      return MatchOperand_ParseFail;
    }
  }
 
  if (Parser.getTok().isNot(AsmToken::RCurly)) {
    Error(Parser.getTok().getLoc(), "'}' expected");
    return MatchOperand_ParseFail;
  }
  E = Parser.getTok().getEndLoc();
  Parser.Lex(); // Eat '}' token.
 
  switch (LaneKind) {
  case NoLanes:
  case AllLanes: {
    // Two-register operands have been converted to the
    // composite register classes.
    if (Count == 2 && !hasMVE()) {
      const MCRegisterClass *RC = (Spacing == 1) ?
        &ARMMCRegisterClasses[ARM::DPairRegClassID] :
        &ARMMCRegisterClasses[ARM::DPairSpcRegClassID];
      FirstReg = MRI->getMatchingSuperReg(FirstReg, ARM::dsub_0, RC);
    }
    auto Create = (LaneKind == NoLanes ? ARMOperand::CreateVectorList :
                   ARMOperand::CreateVectorListAllLanes);
    Operands.push_back(Create(FirstReg, Count, (Spacing == 2), S, E));
    break;
  }
  case IndexedLane:
    Operands.push_back(ARMOperand::CreateVectorListIndexed(FirstReg, Count,
                                                           LaneIndex,
                                                           (Spacing == 2),
                                                           S, E));
    break;
  }
  return MatchOperand_Success;
}
 
/// parseMemBarrierOptOperand - Try to parse DSB/DMB data barrier options.
OperandMatchResultTy
ARMAsmParser::parseMemBarrierOptOperand(OperandVector &Operands) {
  MCAsmParser &Parser = getParser();
  SMLoc S = Parser.getTok().getLoc();
  const AsmToken &Tok = Parser.getTok();
  unsigned Opt;
 
  if (Tok.is(AsmToken::Identifier)) {
    StringRef OptStr = Tok.getString();
 
    Opt = StringSwitch<unsigned>(OptStr.slice(0, OptStr.size()).lower())
      .Case("sy",    ARM_MB::SY)
      .Case("st",    ARM_MB::ST)
      .Case("ld",    ARM_MB::LD)
      .Case("sh",    ARM_MB::ISH)
      .Case("ish",   ARM_MB::ISH)
      .Case("shst",  ARM_MB::ISHST)
      .Case("ishst", ARM_MB::ISHST)
      .Case("ishld", ARM_MB::ISHLD)
      .Case("nsh",   ARM_MB::NSH)
      .Case("un",    ARM_MB::NSH)
      .Case("nshst", ARM_MB::NSHST)
      .Case("nshld", ARM_MB::NSHLD)
      .Case("unst",  ARM_MB::NSHST)
      .Case("osh",   ARM_MB::OSH)
      .Case("oshst", ARM_MB::OSHST)
      .Case("oshld", ARM_MB::OSHLD)