MipsAsmParser.cpp

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//===-- MipsAsmParser.cpp - Parse Mips 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 "MCTargetDesc/MipsABIFlagsSection.h"
#include "MCTargetDesc/MipsABIInfo.h"
#include "MCTargetDesc/MipsBaseInfo.h"
#include "MCTargetDesc/MipsMCExpr.h"
#include "MCTargetDesc/MipsMCTargetDesc.h"
#include "MipsTargetStreamer.h"
#include "TargetInfo/MipsTargetInfo.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/ELF.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/MCObjectFileInfo.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/MCSectionELF.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCSymbolELF.h"
#include "llvm/MC/MCValue.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/Alignment.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/SMLoc.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/TargetParser/SubtargetFeature.h"
#include "llvm/TargetParser/Triple.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <memory>
#include <string>
#include <utility>
 
using namespace llvm;
 
#define DEBUG_TYPE "mips-asm-parser"
 
namespace llvm {
 
class MCInstrInfo;
 
} // end namespace llvm
 
extern cl::opt<bool> EmitJalrReloc;
 
namespace {
 
class MipsAssemblerOptions {
public:
  MipsAssemblerOptions(const FeatureBitset &Features_) : Features(Features_) {}
 
  MipsAssemblerOptions(const MipsAssemblerOptions *Opts) {
    ATReg = Opts->getATRegIndex();
    Reorder = Opts->isReorder();
    Macro = Opts->isMacro();
    Features = Opts->getFeatures();
  }
 
  unsigned getATRegIndex() const { return ATReg; }
  bool setATRegIndex(unsigned Reg) {
    if (Reg > 31)
      return false;
 
    ATReg = Reg;
    return true;
  }
 
  bool isReorder() const { return Reorder; }
  void setReorder() { Reorder = true; }
  void setNoReorder() { Reorder = false; }
 
  bool isMacro() const { return Macro; }
  void setMacro() { Macro = true; }
  void setNoMacro() { Macro = false; }
 
  const FeatureBitset &getFeatures() const { return Features; }
  void setFeatures(const FeatureBitset &Features_) { Features = Features_; }
 
  // Set of features that are either architecture features or referenced
  // by them (e.g.: FeatureNaN2008 implied by FeatureMips32r6).
  // The full table can be found in MipsGenSubtargetInfo.inc (MipsFeatureKV[]).
  // The reason we need this mask is explained in the selectArch function.
  // FIXME: Ideally we would like TableGen to generate this information.
  static const FeatureBitset AllArchRelatedMask;
 
private:
  unsigned ATReg = 1;
  bool Reorder = true;
  bool Macro = true;
  FeatureBitset Features;
};
 
} // end anonymous namespace
 
const FeatureBitset MipsAssemblerOptions::AllArchRelatedMask = {
    Mips::FeatureMips1, Mips::FeatureMips2, Mips::FeatureMips3,
    Mips::FeatureMips3_32, Mips::FeatureMips3_32r2, Mips::FeatureMips4,
    Mips::FeatureMips4_32, Mips::FeatureMips4_32r2, Mips::FeatureMips5,
    Mips::FeatureMips5_32r2, Mips::FeatureMips32, Mips::FeatureMips32r2,
    Mips::FeatureMips32r3, Mips::FeatureMips32r5, Mips::FeatureMips32r6,
    Mips::FeatureMips64, Mips::FeatureMips64r2, Mips::FeatureMips64r3,
    Mips::FeatureMips64r5, Mips::FeatureMips64r6, Mips::FeatureCnMips,
    Mips::FeatureCnMipsP, Mips::FeatureFP64Bit, Mips::FeatureGP64Bit,
    Mips::FeatureNaN2008
};
 
namespace {
 
class MipsAsmParser : public MCTargetAsmParser {
  MipsTargetStreamer &getTargetStreamer() {
    assert(getParser().getStreamer().getTargetStreamer() &&
           "do not have a target streamer");
    MCTargetStreamer &TS = *getParser().getStreamer().getTargetStreamer();
    return static_cast<MipsTargetStreamer &>(TS);
  }
 
  MipsABIInfo ABI;
  SmallVector<std::unique_ptr<MipsAssemblerOptions>, 2> AssemblerOptions;
  MCSymbol *CurrentFn; // Pointer to the function being parsed. It may be a
                       // nullptr, which indicates that no function is currently
                       // selected. This usually happens after an '.end func'
                       // directive.
  bool IsLittleEndian;
  bool IsPicEnabled;
  bool IsCpRestoreSet;
  bool CurForbiddenSlotAttr;
  int CpRestoreOffset;
  unsigned GPReg;
  unsigned CpSaveLocation;
  /// If true, then CpSaveLocation is a register, otherwise it's an offset.
  bool     CpSaveLocationIsRegister;
 
  // Map of register aliases created via the .set directive.
  StringMap<AsmToken> RegisterSets;
 
  // Print a warning along with its fix-it message at the given range.
  void printWarningWithFixIt(const Twine &Msg, const Twine &FixMsg,
                             SMRange Range, bool ShowColors = true);
 
  void ConvertXWPOperands(MCInst &Inst, const OperandVector &Operands);
 
#define GET_ASSEMBLER_HEADER
#include "MipsGenAsmMatcher.inc"
 
  unsigned
  checkEarlyTargetMatchPredicate(MCInst &Inst,
                                 const OperandVector &Operands) override;
  unsigned checkTargetMatchPredicate(MCInst &Inst) override;
 
  bool MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
                               OperandVector &Operands, MCStreamer &Out,
                               uint64_t &ErrorInfo,
                               bool MatchingInlineAsm) override;
 
  /// Parse a register as used in CFI directives
  bool parseRegister(MCRegister &Reg, SMLoc &StartLoc, SMLoc &EndLoc) override;
  ParseStatus tryParseRegister(MCRegister &Reg, SMLoc &StartLoc,
                               SMLoc &EndLoc) override;
 
  bool parseParenSuffix(StringRef Name, OperandVector &Operands);
 
  bool parseBracketSuffix(StringRef Name, OperandVector &Operands);
 
  bool mnemonicIsValid(StringRef Mnemonic, unsigned VariantID);
 
  bool ParseInstruction(ParseInstructionInfo &Info, StringRef Name,
                        SMLoc NameLoc, OperandVector &Operands) override;
 
  bool ParseDirective(AsmToken DirectiveID) override;
 
  ParseStatus parseMemOperand(OperandVector &Operands);
  ParseStatus matchAnyRegisterNameWithoutDollar(OperandVector &Operands,
                                                StringRef Identifier, SMLoc S);
  ParseStatus matchAnyRegisterWithoutDollar(OperandVector &Operands,
                                            const AsmToken &Token, SMLoc S);
  ParseStatus matchAnyRegisterWithoutDollar(OperandVector &Operands, SMLoc S);
  ParseStatus parseAnyRegister(OperandVector &Operands);
  ParseStatus parseImm(OperandVector &Operands);
  ParseStatus parseJumpTarget(OperandVector &Operands);
  ParseStatus parseInvNum(OperandVector &Operands);
  ParseStatus parseRegisterList(OperandVector &Operands);
 
  bool searchSymbolAlias(OperandVector &Operands);
 
  bool parseOperand(OperandVector &, StringRef Mnemonic);
 
  enum MacroExpanderResultTy {
    MER_NotAMacro,
    MER_Success,
    MER_Fail,
  };
 
  // Expands assembly pseudo instructions.
  MacroExpanderResultTy tryExpandInstruction(MCInst &Inst, SMLoc IDLoc,
                                             MCStreamer &Out,
                                             const MCSubtargetInfo *STI);
 
  bool expandJalWithRegs(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                         const MCSubtargetInfo *STI);
 
  bool loadImmediate(int64_t ImmValue, unsigned DstReg, unsigned SrcReg,
                     bool Is32BitImm, bool IsAddress, SMLoc IDLoc,
                     MCStreamer &Out, const MCSubtargetInfo *STI);
 
  bool loadAndAddSymbolAddress(const MCExpr *SymExpr, unsigned DstReg,
                               unsigned SrcReg, bool Is32BitSym, SMLoc IDLoc,
                               MCStreamer &Out, const MCSubtargetInfo *STI);
 
  bool emitPartialAddress(MipsTargetStreamer &TOut, SMLoc IDLoc, MCSymbol *Sym);
 
  bool expandLoadImm(MCInst &Inst, bool Is32BitImm, SMLoc IDLoc,
                     MCStreamer &Out, const MCSubtargetInfo *STI);
 
  bool expandLoadSingleImmToGPR(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                const MCSubtargetInfo *STI);
  bool expandLoadSingleImmToFPR(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                const MCSubtargetInfo *STI);
  bool expandLoadDoubleImmToGPR(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                const MCSubtargetInfo *STI);
  bool expandLoadDoubleImmToFPR(MCInst &Inst, bool Is64FPU, SMLoc IDLoc,
                                MCStreamer &Out, const MCSubtargetInfo *STI);
 
  bool expandLoadAddress(unsigned DstReg, unsigned BaseReg,
                         const MCOperand &Offset, bool Is32BitAddress,
                         SMLoc IDLoc, MCStreamer &Out,
                         const MCSubtargetInfo *STI);
 
  bool expandUncondBranchMMPseudo(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                  const MCSubtargetInfo *STI);
 
  void expandMem16Inst(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                       const MCSubtargetInfo *STI, bool IsLoad);
  void expandMem9Inst(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                      const MCSubtargetInfo *STI, bool IsLoad);
 
  bool expandLoadStoreMultiple(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                               const MCSubtargetInfo *STI);
 
  bool expandAliasImmediate(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                            const MCSubtargetInfo *STI);
 
  bool expandBranchImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                       const MCSubtargetInfo *STI);
 
  bool expandCondBranches(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                          const MCSubtargetInfo *STI);
 
  bool expandDivRem(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                    const MCSubtargetInfo *STI, const bool IsMips64,
                    const bool Signed);
 
  bool expandTrunc(MCInst &Inst, bool IsDouble, bool Is64FPU, SMLoc IDLoc,
                   MCStreamer &Out, const MCSubtargetInfo *STI);
 
  bool expandUlh(MCInst &Inst, bool Signed, SMLoc IDLoc, MCStreamer &Out,
                 const MCSubtargetInfo *STI);
 
  bool expandUsh(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                 const MCSubtargetInfo *STI);
 
  bool expandUxw(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                 const MCSubtargetInfo *STI);
 
  bool expandSge(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                 const MCSubtargetInfo *STI);
 
  bool expandSgeImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                    const MCSubtargetInfo *STI);
 
  bool expandSgtImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                    const MCSubtargetInfo *STI);
 
  bool expandSle(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                 const MCSubtargetInfo *STI);
 
  bool expandSleImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                    const MCSubtargetInfo *STI);
 
  bool expandRotation(MCInst &Inst, SMLoc IDLoc,
                      MCStreamer &Out, const MCSubtargetInfo *STI);
  bool expandRotationImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                         const MCSubtargetInfo *STI);
  bool expandDRotation(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                       const MCSubtargetInfo *STI);
  bool expandDRotationImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                          const MCSubtargetInfo *STI);
 
  bool expandAbs(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                 const MCSubtargetInfo *STI);
 
  bool expandMulImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                    const MCSubtargetInfo *STI);
 
  bool expandMulO(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                  const MCSubtargetInfo *STI);
 
  bool expandMulOU(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                   const MCSubtargetInfo *STI);
 
  bool expandDMULMacro(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                       const MCSubtargetInfo *STI);
 
  bool expandLoadStoreDMacro(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                             const MCSubtargetInfo *STI, bool IsLoad);
 
  bool expandStoreDM1Macro(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                           const MCSubtargetInfo *STI);
 
  bool expandSeq(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                 const MCSubtargetInfo *STI);
 
  bool expandSeqI(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                  const MCSubtargetInfo *STI);
 
  bool expandSne(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                 const MCSubtargetInfo *STI);
 
  bool expandSneI(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                  const MCSubtargetInfo *STI);
 
  bool expandMXTRAlias(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                       const MCSubtargetInfo *STI);
 
  bool expandSaaAddr(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                     const MCSubtargetInfo *STI);
 
  bool reportParseError(const Twine &ErrorMsg);
  bool reportParseError(SMLoc Loc, const Twine &ErrorMsg);
 
  bool parseMemOffset(const MCExpr *&Res, bool isParenExpr);
 
  bool parseSetMips0Directive();
  bool parseSetArchDirective();
  bool parseSetFeature(uint64_t Feature);
  bool isPicAndNotNxxAbi(); // Used by .cpload, .cprestore, and .cpsetup.
  bool parseDirectiveCpAdd(SMLoc Loc);
  bool parseDirectiveCpLoad(SMLoc Loc);
  bool parseDirectiveCpLocal(SMLoc Loc);
  bool parseDirectiveCpRestore(SMLoc Loc);
  bool parseDirectiveCPSetup();
  bool parseDirectiveCPReturn();
  bool parseDirectiveNaN();
  bool parseDirectiveSet();
  bool parseDirectiveOption();
  bool parseInsnDirective();
  bool parseRSectionDirective(StringRef Section);
  bool parseSSectionDirective(StringRef Section, unsigned Type);
 
  bool parseSetAtDirective();
  bool parseSetNoAtDirective();
  bool parseSetMacroDirective();
  bool parseSetNoMacroDirective();
  bool parseSetMsaDirective();
  bool parseSetNoMsaDirective();
  bool parseSetNoDspDirective();
  bool parseSetNoMips3DDirective();
  bool parseSetReorderDirective();
  bool parseSetNoReorderDirective();
  bool parseSetMips16Directive();
  bool parseSetNoMips16Directive();
  bool parseSetFpDirective();
  bool parseSetOddSPRegDirective();
  bool parseSetNoOddSPRegDirective();
  bool parseSetPopDirective();
  bool parseSetPushDirective();
  bool parseSetSoftFloatDirective();
  bool parseSetHardFloatDirective();
  bool parseSetMtDirective();
  bool parseSetNoMtDirective();
  bool parseSetNoCRCDirective();
  bool parseSetNoVirtDirective();
  bool parseSetNoGINVDirective();
 
  bool parseSetAssignment();
 
  bool parseDirectiveGpWord();
  bool parseDirectiveGpDWord();
  bool parseDirectiveDtpRelWord();
  bool parseDirectiveDtpRelDWord();
  bool parseDirectiveTpRelWord();
  bool parseDirectiveTpRelDWord();
  bool parseDirectiveModule();
  bool parseDirectiveModuleFP();
  bool parseFpABIValue(MipsABIFlagsSection::FpABIKind &FpABI,
                       StringRef Directive);
 
  bool parseInternalDirectiveReallowModule();
 
  bool eatComma(StringRef ErrorStr);
 
  int matchCPURegisterName(StringRef Symbol);
 
  int matchHWRegsRegisterName(StringRef Symbol);
 
  int matchFPURegisterName(StringRef Name);
 
  int matchFCCRegisterName(StringRef Name);
 
  int matchACRegisterName(StringRef Name);
 
  int matchMSA128RegisterName(StringRef Name);
 
  int matchMSA128CtrlRegisterName(StringRef Name);
 
  unsigned getReg(int RC, int RegNo);
 
  /// Returns the internal register number for the current AT. Also checks if
  /// the current AT is unavailable (set to $0) and gives an error if it is.
  /// This should be used in pseudo-instruction expansions which need AT.
  unsigned getATReg(SMLoc Loc);
 
  bool canUseATReg();
 
  bool processInstruction(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                          const MCSubtargetInfo *STI);
 
  // Helper function that checks if the value of a vector index is within the
  // boundaries of accepted values for each RegisterKind
  // Example: INSERT.B $w0[n], $1 => 16 > n >= 0
  bool validateMSAIndex(int Val, int RegKind);
 
  // Selects a new architecture by updating the FeatureBits with the necessary
  // info including implied dependencies.
  // Internally, it clears all the feature bits related to *any* architecture
  // and selects the new one using the ToggleFeature functionality of the
  // MCSubtargetInfo object that handles implied dependencies. The reason we
  // clear all the arch related bits manually is because ToggleFeature only
  // clears the features that imply the feature being cleared and not the
  // features implied by the feature being cleared. This is easier to see
  // with an example:
  //  --------------------------------------------------
  // | Feature         | Implies                        |
  // | -------------------------------------------------|
  // | FeatureMips1    | None                           |
  // | FeatureMips2    | FeatureMips1                   |
  // | FeatureMips3    | FeatureMips2 | FeatureMipsGP64 |
  // | FeatureMips4    | FeatureMips3                   |
  // | ...             |                                |
  //  --------------------------------------------------
  //
  // Setting Mips3 is equivalent to set: (FeatureMips3 | FeatureMips2 |
  // FeatureMipsGP64 | FeatureMips1)
  // Clearing Mips3 is equivalent to clear (FeatureMips3 | FeatureMips4).
  void selectArch(StringRef ArchFeature) {
    MCSubtargetInfo &STI = copySTI();
    FeatureBitset FeatureBits = STI.getFeatureBits();
    FeatureBits &= ~MipsAssemblerOptions::AllArchRelatedMask;
    STI.setFeatureBits(FeatureBits);
    setAvailableFeatures(
        ComputeAvailableFeatures(STI.ToggleFeature(ArchFeature)));
    AssemblerOptions.back()->setFeatures(STI.getFeatureBits());
  }
 
  void setFeatureBits(uint64_t Feature, StringRef FeatureString) {
    if (!(getSTI().hasFeature(Feature))) {
      MCSubtargetInfo &STI = copySTI();
      setAvailableFeatures(
          ComputeAvailableFeatures(STI.ToggleFeature(FeatureString)));
      AssemblerOptions.back()->setFeatures(STI.getFeatureBits());
    }
  }
 
  void clearFeatureBits(uint64_t Feature, StringRef FeatureString) {
    if (getSTI().hasFeature(Feature)) {
      MCSubtargetInfo &STI = copySTI();
      setAvailableFeatures(
          ComputeAvailableFeatures(STI.ToggleFeature(FeatureString)));
      AssemblerOptions.back()->setFeatures(STI.getFeatureBits());
    }
  }
 
  void setModuleFeatureBits(uint64_t Feature, StringRef FeatureString) {
    setFeatureBits(Feature, FeatureString);
    AssemblerOptions.front()->setFeatures(getSTI().getFeatureBits());
  }
 
  void clearModuleFeatureBits(uint64_t Feature, StringRef FeatureString) {
    clearFeatureBits(Feature, FeatureString);
    AssemblerOptions.front()->setFeatures(getSTI().getFeatureBits());
  }
 
public:
  enum MipsMatchResultTy {
    Match_RequiresDifferentSrcAndDst = FIRST_TARGET_MATCH_RESULT_TY,
    Match_RequiresDifferentOperands,
    Match_RequiresNoZeroRegister,
    Match_RequiresSameSrcAndDst,
    Match_NoFCCRegisterForCurrentISA,
    Match_NonZeroOperandForSync,
    Match_NonZeroOperandForMTCX,
    Match_RequiresPosSizeRange0_32,
    Match_RequiresPosSizeRange33_64,
    Match_RequiresPosSizeUImm6,
#define GET_OPERAND_DIAGNOSTIC_TYPES
#include "MipsGenAsmMatcher.inc"
#undef GET_OPERAND_DIAGNOSTIC_TYPES
  };
 
  MipsAsmParser(const MCSubtargetInfo &sti, MCAsmParser &parser,
                const MCInstrInfo &MII, const MCTargetOptions &Options)
    : MCTargetAsmParser(Options, sti, MII),
        ABI(MipsABIInfo::computeTargetABI(Triple(sti.getTargetTriple()),
                                          sti.getCPU(), Options)) {
    MCAsmParserExtension::Initialize(parser);
 
    parser.addAliasForDirective(".asciiz", ".asciz");
    parser.addAliasForDirective(".hword", ".2byte");
    parser.addAliasForDirective(".word", ".4byte");
    parser.addAliasForDirective(".dword", ".8byte");
 
    // Initialize the set of available features.
    setAvailableFeatures(ComputeAvailableFeatures(getSTI().getFeatureBits()));
 
    // Remember the initial assembler options. The user can not modify these.
    AssemblerOptions.push_back(
        std::make_unique<MipsAssemblerOptions>(getSTI().getFeatureBits()));
 
    // Create an assembler options environment for the user to modify.
    AssemblerOptions.push_back(
        std::make_unique<MipsAssemblerOptions>(getSTI().getFeatureBits()));
 
    getTargetStreamer().updateABIInfo(*this);
 
    if (!isABI_O32() && !useOddSPReg() != 0)
      report_fatal_error("-mno-odd-spreg requires the O32 ABI");
 
    CurrentFn = nullptr;
 
    CurForbiddenSlotAttr = false;
    IsPicEnabled = getContext().getObjectFileInfo()->isPositionIndependent();
 
    IsCpRestoreSet = false;
    CpRestoreOffset = -1;
    GPReg = ABI.GetGlobalPtr();
 
    const Triple &TheTriple = sti.getTargetTriple();
    IsLittleEndian = TheTriple.isLittleEndian();
 
    if (getSTI().getCPU() == "mips64r6" && inMicroMipsMode())
      report_fatal_error("microMIPS64R6 is not supported", false);
 
    if (!isABI_O32() && inMicroMipsMode())
      report_fatal_error("microMIPS64 is not supported", false);
  }
 
  /// True if all of $fcc0 - $fcc7 exist for the current ISA.
  bool hasEightFccRegisters() const { return hasMips4() || hasMips32(); }
 
  bool isGP64bit() const {
    return getSTI().hasFeature(Mips::FeatureGP64Bit);
  }
 
  bool isFP64bit() const {
    return getSTI().hasFeature(Mips::FeatureFP64Bit);
  }
 
  bool isJalrRelocAvailable(const MCExpr *JalExpr) {
    if (!EmitJalrReloc)
      return false;
    MCValue Res;
    if (!JalExpr->evaluateAsRelocatable(Res, nullptr, nullptr))
      return false;
    if (Res.getSymB() != nullptr)
      return false;
    if (Res.getConstant() != 0)
      return ABI.IsN32() || ABI.IsN64();
    return true;
  }
 
  const MipsABIInfo &getABI() const { return ABI; }
  bool isABI_N32() const { return ABI.IsN32(); }
  bool isABI_N64() const { return ABI.IsN64(); }
  bool isABI_O32() const { return ABI.IsO32(); }
  bool isABI_FPXX() const {
    return getSTI().hasFeature(Mips::FeatureFPXX);
  }
 
  bool useOddSPReg() const {
    return !(getSTI().hasFeature(Mips::FeatureNoOddSPReg));
  }
 
  bool inMicroMipsMode() const {
    return getSTI().hasFeature(Mips::FeatureMicroMips);
  }
 
  bool hasMips1() const {
    return getSTI().hasFeature(Mips::FeatureMips1);
  }
 
  bool hasMips2() const {
    return getSTI().hasFeature(Mips::FeatureMips2);
  }
 
  bool hasMips3() const {
    return getSTI().hasFeature(Mips::FeatureMips3);
  }
 
  bool hasMips4() const {
    return getSTI().hasFeature(Mips::FeatureMips4);
  }
 
  bool hasMips5() const {
    return getSTI().hasFeature(Mips::FeatureMips5);
  }
 
  bool hasMips32() const {
    return getSTI().hasFeature(Mips::FeatureMips32);
  }
 
  bool hasMips64() const {
    return getSTI().hasFeature(Mips::FeatureMips64);
  }
 
  bool hasMips32r2() const {
    return getSTI().hasFeature(Mips::FeatureMips32r2);
  }
 
  bool hasMips64r2() const {
    return getSTI().hasFeature(Mips::FeatureMips64r2);
  }
 
  bool hasMips32r3() const {
    return (getSTI().hasFeature(Mips::FeatureMips32r3));
  }
 
  bool hasMips64r3() const {
    return (getSTI().hasFeature(Mips::FeatureMips64r3));
  }
 
  bool hasMips32r5() const {
    return (getSTI().hasFeature(Mips::FeatureMips32r5));
  }
 
  bool hasMips64r5() const {
    return (getSTI().hasFeature(Mips::FeatureMips64r5));
  }
 
  bool hasMips32r6() const {
    return getSTI().hasFeature(Mips::FeatureMips32r6);
  }
 
  bool hasMips64r6() const {
    return getSTI().hasFeature(Mips::FeatureMips64r6);
  }
 
  bool hasDSP() const {
    return getSTI().hasFeature(Mips::FeatureDSP);
  }
 
  bool hasDSPR2() const {
    return getSTI().hasFeature(Mips::FeatureDSPR2);
  }
 
  bool hasDSPR3() const {
    return getSTI().hasFeature(Mips::FeatureDSPR3);
  }
 
  bool hasMSA() const {
    return getSTI().hasFeature(Mips::FeatureMSA);
  }
 
  bool hasCnMips() const {
    return (getSTI().hasFeature(Mips::FeatureCnMips));
  }
 
  bool hasCnMipsP() const {
    return (getSTI().hasFeature(Mips::FeatureCnMipsP));
  }
 
  bool inPicMode() {
    return IsPicEnabled;
  }
 
  bool inMips16Mode() const {
    return getSTI().hasFeature(Mips::FeatureMips16);
  }
 
  bool useTraps() const {
    return getSTI().hasFeature(Mips::FeatureUseTCCInDIV);
  }
 
  bool useSoftFloat() const {
    return getSTI().hasFeature(Mips::FeatureSoftFloat);
  }
  bool hasMT() const {
    return getSTI().hasFeature(Mips::FeatureMT);
  }
 
  bool hasCRC() const {
    return getSTI().hasFeature(Mips::FeatureCRC);
  }
 
  bool hasVirt() const {
    return getSTI().hasFeature(Mips::FeatureVirt);
  }
 
  bool hasGINV() const {
    return getSTI().hasFeature(Mips::FeatureGINV);
  }
 
  bool hasForbiddenSlot(const MCInstrDesc &MCID) const {
    return !inMicroMipsMode() && (MCID.TSFlags & MipsII::HasForbiddenSlot);
  }
 
  bool SafeInForbiddenSlot(const MCInstrDesc &MCID) const {
    return !(MCID.TSFlags & MipsII::IsCTI);
  }
 
  void onEndOfFile() override;
 
  /// Warn if RegIndex is the same as the current AT.
  void warnIfRegIndexIsAT(unsigned RegIndex, SMLoc Loc);
 
  void warnIfNoMacro(SMLoc Loc);
 
  bool isLittle() const { return IsLittleEndian; }
 
  const MCExpr *createTargetUnaryExpr(const MCExpr *E,
                                      AsmToken::TokenKind OperatorToken,
                                      MCContext &Ctx) override {
    switch(OperatorToken) {
    default:
      llvm_unreachable("Unknown token");
      return nullptr;
    case AsmToken::PercentCall16:
      return MipsMCExpr::create(MipsMCExpr::MEK_GOT_CALL, E, Ctx);
    case AsmToken::PercentCall_Hi:
      return MipsMCExpr::create(MipsMCExpr::MEK_CALL_HI16, E, Ctx);
    case AsmToken::PercentCall_Lo:
      return MipsMCExpr::create(MipsMCExpr::MEK_CALL_LO16, E, Ctx);
    case AsmToken::PercentDtprel_Hi:
      return MipsMCExpr::create(MipsMCExpr::MEK_DTPREL_HI, E, Ctx);
    case AsmToken::PercentDtprel_Lo:
      return MipsMCExpr::create(MipsMCExpr::MEK_DTPREL_LO, E, Ctx);
    case AsmToken::PercentGot:
      return MipsMCExpr::create(MipsMCExpr::MEK_GOT, E, Ctx);
    case AsmToken::PercentGot_Disp:
      return MipsMCExpr::create(MipsMCExpr::MEK_GOT_DISP, E, Ctx);
    case AsmToken::PercentGot_Hi:
      return MipsMCExpr::create(MipsMCExpr::MEK_GOT_HI16, E, Ctx);
    case AsmToken::PercentGot_Lo:
      return MipsMCExpr::create(MipsMCExpr::MEK_GOT_LO16, E, Ctx);
    case AsmToken::PercentGot_Ofst:
      return MipsMCExpr::create(MipsMCExpr::MEK_GOT_OFST, E, Ctx);
    case AsmToken::PercentGot_Page:
      return MipsMCExpr::create(MipsMCExpr::MEK_GOT_PAGE, E, Ctx);
    case AsmToken::PercentGottprel:
      return MipsMCExpr::create(MipsMCExpr::MEK_GOTTPREL, E, Ctx);
    case AsmToken::PercentGp_Rel:
      return MipsMCExpr::create(MipsMCExpr::MEK_GPREL, E, Ctx);
    case AsmToken::PercentHi:
      return MipsMCExpr::create(MipsMCExpr::MEK_HI, E, Ctx);
    case AsmToken::PercentHigher:
      return MipsMCExpr::create(MipsMCExpr::MEK_HIGHER, E, Ctx);
    case AsmToken::PercentHighest:
      return MipsMCExpr::create(MipsMCExpr::MEK_HIGHEST, E, Ctx);
    case AsmToken::PercentLo:
      return MipsMCExpr::create(MipsMCExpr::MEK_LO, E, Ctx);
    case AsmToken::PercentNeg:
      return MipsMCExpr::create(MipsMCExpr::MEK_NEG, E, Ctx);
    case AsmToken::PercentPcrel_Hi:
      return MipsMCExpr::create(MipsMCExpr::MEK_PCREL_HI16, E, Ctx);
    case AsmToken::PercentPcrel_Lo:
      return MipsMCExpr::create(MipsMCExpr::MEK_PCREL_LO16, E, Ctx);
    case AsmToken::PercentTlsgd:
      return MipsMCExpr::create(MipsMCExpr::MEK_TLSGD, E, Ctx);
    case AsmToken::PercentTlsldm:
      return MipsMCExpr::create(MipsMCExpr::MEK_TLSLDM, E, Ctx);
    case AsmToken::PercentTprel_Hi:
      return MipsMCExpr::create(MipsMCExpr::MEK_TPREL_HI, E, Ctx);
    case AsmToken::PercentTprel_Lo:
      return MipsMCExpr::create(MipsMCExpr::MEK_TPREL_LO, E, Ctx);
    }
  }
 
  bool areEqualRegs(const MCParsedAsmOperand &Op1,
                    const MCParsedAsmOperand &Op2) const override;
};
 
/// MipsOperand - Instances of this class represent a parsed Mips machine
/// instruction.
class MipsOperand : public MCParsedAsmOperand {
public:
  /// Broad categories of register classes
  /// The exact class is finalized by the render method.
  enum RegKind {
    RegKind_GPR = 1,      /// GPR32 and GPR64 (depending on isGP64bit())
    RegKind_FGR = 2,      /// FGR32, FGR64, AFGR64 (depending on context and
                          /// isFP64bit())
    RegKind_FCC = 4,      /// FCC
    RegKind_MSA128 = 8,   /// MSA128[BHWD] (makes no difference which)
    RegKind_MSACtrl = 16, /// MSA control registers
    RegKind_COP2 = 32,    /// COP2
    RegKind_ACC = 64,     /// HI32DSP, LO32DSP, and ACC64DSP (depending on
                          /// context).
    RegKind_CCR = 128,    /// CCR
    RegKind_HWRegs = 256, /// HWRegs
    RegKind_COP3 = 512,   /// COP3
    RegKind_COP0 = 1024,  /// COP0
    /// Potentially any (e.g. $1)
    RegKind_Numeric = RegKind_GPR | RegKind_FGR | RegKind_FCC | RegKind_MSA128 |
                      RegKind_MSACtrl | RegKind_COP2 | RegKind_ACC |
                      RegKind_CCR | RegKind_HWRegs | RegKind_COP3 | RegKind_COP0
  };
 
private:
  enum KindTy {
    k_Immediate,     /// An immediate (possibly involving symbol references)
    k_Memory,        /// Base + Offset Memory Address
    k_RegisterIndex, /// A register index in one or more RegKind.
    k_Token,         /// A simple token
    k_RegList,       /// A physical register list
  } Kind;
 
public:
  MipsOperand(KindTy K, MipsAsmParser &Parser) : Kind(K), AsmParser(Parser) {}
 
  ~MipsOperand() override {
    switch (Kind) {
    case k_Memory:
      delete Mem.Base;
      break;
    case k_RegList:
      delete RegList.List;
      break;
    case k_Immediate:
    case k_RegisterIndex:
    case k_Token:
      break;
    }
  }
 
private:
  /// For diagnostics, and checking the assembler temporary
  MipsAsmParser &AsmParser;
 
  struct Token {
    const char *Data;
    unsigned Length;
  };
 
  struct RegIdxOp {
    unsigned Index; /// Index into the register class
    RegKind Kind;   /// Bitfield of the kinds it could possibly be
    struct Token Tok; /// The input token this operand originated from.
    const MCRegisterInfo *RegInfo;
  };
 
  struct ImmOp {
    const MCExpr *Val;
  };
 
  struct MemOp {
    MipsOperand *Base;
    const MCExpr *Off;
  };
 
  struct RegListOp {
    SmallVector<unsigned, 10> *List;
  };
 
  union {
    struct Token Tok;
    struct RegIdxOp RegIdx;
    struct ImmOp Imm;
    struct MemOp Mem;
    struct RegListOp RegList;
  };
 
  SMLoc StartLoc, EndLoc;
 
  /// Internal constructor for register kinds
  static std::unique_ptr<MipsOperand> CreateReg(unsigned Index, StringRef Str,
                                                RegKind RegKind,
                                                const MCRegisterInfo *RegInfo,
                                                SMLoc S, SMLoc E,
                                                MipsAsmParser &Parser) {
    auto Op = std::make_unique<MipsOperand>(k_RegisterIndex, Parser);
    Op->RegIdx.Index = Index;
    Op->RegIdx.RegInfo = RegInfo;
    Op->RegIdx.Kind = RegKind;
    Op->RegIdx.Tok.Data = Str.data();
    Op->RegIdx.Tok.Length = Str.size();
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
public:
  /// Coerce the register to GPR32 and return the real register for the current
  /// target.
  unsigned getGPR32Reg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_GPR) && "Invalid access!");
    AsmParser.warnIfRegIndexIsAT(RegIdx.Index, StartLoc);
    unsigned ClassID = Mips::GPR32RegClassID;
    return RegIdx.RegInfo->getRegClass(ClassID).getRegister(RegIdx.Index);
  }
 
  /// Coerce the register to GPR32 and return the real register for the current
  /// target.
  unsigned getGPRMM16Reg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_GPR) && "Invalid access!");
    unsigned ClassID = Mips::GPR32RegClassID;
    return RegIdx.RegInfo->getRegClass(ClassID).getRegister(RegIdx.Index);
  }
 
  /// Coerce the register to GPR64 and return the real register for the current
  /// target.
  unsigned getGPR64Reg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_GPR) && "Invalid access!");
    unsigned ClassID = Mips::GPR64RegClassID;
    return RegIdx.RegInfo->getRegClass(ClassID).getRegister(RegIdx.Index);
  }
 
private:
  /// Coerce the register to AFGR64 and return the real register for the current
  /// target.
  unsigned getAFGR64Reg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_FGR) && "Invalid access!");
    if (RegIdx.Index % 2 != 0)
      AsmParser.Warning(StartLoc, "Float register should be even.");
    return RegIdx.RegInfo->getRegClass(Mips::AFGR64RegClassID)
        .getRegister(RegIdx.Index / 2);
  }
 
  /// Coerce the register to FGR64 and return the real register for the current
  /// target.
  unsigned getFGR64Reg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_FGR) && "Invalid access!");
    return RegIdx.RegInfo->getRegClass(Mips::FGR64RegClassID)
        .getRegister(RegIdx.Index);
  }
 
  /// Coerce the register to FGR32 and return the real register for the current
  /// target.
  unsigned getFGR32Reg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_FGR) && "Invalid access!");
    return RegIdx.RegInfo->getRegClass(Mips::FGR32RegClassID)
        .getRegister(RegIdx.Index);
  }
 
  /// Coerce the register to FCC and return the real register for the current
  /// target.
  unsigned getFCCReg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_FCC) && "Invalid access!");
    return RegIdx.RegInfo->getRegClass(Mips::FCCRegClassID)
        .getRegister(RegIdx.Index);
  }
 
  /// Coerce the register to MSA128 and return the real register for the current
  /// target.
  unsigned getMSA128Reg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_MSA128) && "Invalid access!");
    // It doesn't matter which of the MSA128[BHWD] classes we use. They are all
    // identical
    unsigned ClassID = Mips::MSA128BRegClassID;
    return RegIdx.RegInfo->getRegClass(ClassID).getRegister(RegIdx.Index);
  }
 
  /// Coerce the register to MSACtrl and return the real register for the
  /// current target.
  unsigned getMSACtrlReg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_MSACtrl) && "Invalid access!");
    unsigned ClassID = Mips::MSACtrlRegClassID;
    return RegIdx.RegInfo->getRegClass(ClassID).getRegister(RegIdx.Index);
  }
 
  /// Coerce the register to COP0 and return the real register for the
  /// current target.
  unsigned getCOP0Reg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_COP0) && "Invalid access!");
    unsigned ClassID = Mips::COP0RegClassID;
    return RegIdx.RegInfo->getRegClass(ClassID).getRegister(RegIdx.Index);
  }
 
  /// Coerce the register to COP2 and return the real register for the
  /// current target.
  unsigned getCOP2Reg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_COP2) && "Invalid access!");
    unsigned ClassID = Mips::COP2RegClassID;
    return RegIdx.RegInfo->getRegClass(ClassID).getRegister(RegIdx.Index);
  }
 
  /// Coerce the register to COP3 and return the real register for the
  /// current target.
  unsigned getCOP3Reg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_COP3) && "Invalid access!");
    unsigned ClassID = Mips::COP3RegClassID;
    return RegIdx.RegInfo->getRegClass(ClassID).getRegister(RegIdx.Index);
  }
 
  /// Coerce the register to ACC64DSP and return the real register for the
  /// current target.
  unsigned getACC64DSPReg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_ACC) && "Invalid access!");
    unsigned ClassID = Mips::ACC64DSPRegClassID;
    return RegIdx.RegInfo->getRegClass(ClassID).getRegister(RegIdx.Index);
  }
 
  /// Coerce the register to HI32DSP and return the real register for the
  /// current target.
  unsigned getHI32DSPReg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_ACC) && "Invalid access!");
    unsigned ClassID = Mips::HI32DSPRegClassID;
    return RegIdx.RegInfo->getRegClass(ClassID).getRegister(RegIdx.Index);
  }
 
  /// Coerce the register to LO32DSP and return the real register for the
  /// current target.
  unsigned getLO32DSPReg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_ACC) && "Invalid access!");
    unsigned ClassID = Mips::LO32DSPRegClassID;
    return RegIdx.RegInfo->getRegClass(ClassID).getRegister(RegIdx.Index);
  }
 
  /// Coerce the register to CCR and return the real register for the
  /// current target.
  unsigned getCCRReg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_CCR) && "Invalid access!");
    unsigned ClassID = Mips::CCRRegClassID;
    return RegIdx.RegInfo->getRegClass(ClassID).getRegister(RegIdx.Index);
  }
 
  /// Coerce the register to HWRegs and return the real register for the
  /// current target.
  unsigned getHWRegsReg() const {
    assert(isRegIdx() && (RegIdx.Kind & RegKind_HWRegs) && "Invalid access!");
    unsigned ClassID = Mips::HWRegsRegClassID;
    return RegIdx.RegInfo->getRegClass(ClassID).getRegister(RegIdx.Index);
  }
 
public:
  void addExpr(MCInst &Inst, const MCExpr *Expr) const {
    // Add as immediate 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 addRegOperands(MCInst &Inst, unsigned N) const {
    llvm_unreachable("Use a custom parser instead");
  }
 
  /// Render the operand to an MCInst as a GPR32
  /// Asserts if the wrong number of operands are requested, or the operand
  /// is not a k_RegisterIndex compatible with RegKind_GPR
  void addGPR32ZeroAsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getGPR32Reg()));
  }
 
  void addGPR32NonZeroAsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getGPR32Reg()));
  }
 
  void addGPR32AsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getGPR32Reg()));
  }
 
  void addGPRMM16AsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getGPRMM16Reg()));
  }
 
  void addGPRMM16AsmRegZeroOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getGPRMM16Reg()));
  }
 
  void addGPRMM16AsmRegMovePOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getGPRMM16Reg()));
  }
 
  void addGPRMM16AsmRegMovePPairFirstOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getGPRMM16Reg()));
  }
 
  void addGPRMM16AsmRegMovePPairSecondOperands(MCInst &Inst,
                                               unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getGPRMM16Reg()));
  }
 
  /// Render the operand to an MCInst as a GPR64
  /// Asserts if the wrong number of operands are requested, or the operand
  /// is not a k_RegisterIndex compatible with RegKind_GPR
  void addGPR64AsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getGPR64Reg()));
  }
 
  void addAFGR64AsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getAFGR64Reg()));
  }
 
  void addStrictlyAFGR64AsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getAFGR64Reg()));
  }
 
  void addStrictlyFGR64AsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getFGR64Reg()));
  }
 
  void addFGR64AsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getFGR64Reg()));
  }
 
  void addFGR32AsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getFGR32Reg()));
    // FIXME: We ought to do this for -integrated-as without -via-file-asm too.
    // FIXME: This should propagate failure up to parseStatement.
    if (!AsmParser.useOddSPReg() && RegIdx.Index & 1)
      AsmParser.getParser().printError(
          StartLoc, "-mno-odd-spreg prohibits the use of odd FPU "
                    "registers");
  }
 
  void addStrictlyFGR32AsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getFGR32Reg()));
    // FIXME: We ought to do this for -integrated-as without -via-file-asm too.
    if (!AsmParser.useOddSPReg() && RegIdx.Index & 1)
      AsmParser.Error(StartLoc, "-mno-odd-spreg prohibits the use of odd FPU "
                                "registers");
  }
 
  void addFCCAsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getFCCReg()));
  }
 
  void addMSA128AsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getMSA128Reg()));
  }
 
  void addMSACtrlAsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getMSACtrlReg()));
  }
 
  void addCOP0AsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getCOP0Reg()));
  }
 
  void addCOP2AsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getCOP2Reg()));
  }
 
  void addCOP3AsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getCOP3Reg()));
  }
 
  void addACC64DSPAsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getACC64DSPReg()));
  }
 
  void addHI32DSPAsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getHI32DSPReg()));
  }
 
  void addLO32DSPAsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getLO32DSPReg()));
  }
 
  void addCCRAsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getCCRReg()));
  }
 
  void addHWRegsAsmRegOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    Inst.addOperand(MCOperand::createReg(getHWRegsReg()));
  }
 
  template <unsigned Bits, int Offset = 0, int AdjustOffset = 0>
  void addConstantUImmOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    uint64_t Imm = getConstantImm() - Offset;
    Imm &= (1ULL << Bits) - 1;
    Imm += Offset;
    Imm += AdjustOffset;
    Inst.addOperand(MCOperand::createImm(Imm));
  }
 
  template <unsigned Bits>
  void addSImmOperands(MCInst &Inst, unsigned N) const {
    if (isImm() && !isConstantImm()) {
      addExpr(Inst, getImm());
      return;
    }
    addConstantSImmOperands<Bits, 0, 0>(Inst, N);
  }
 
  template <unsigned Bits>
  void addUImmOperands(MCInst &Inst, unsigned N) const {
    if (isImm() && !isConstantImm()) {
      addExpr(Inst, getImm());
      return;
    }
    addConstantUImmOperands<Bits, 0, 0>(Inst, N);
  }
 
  template <unsigned Bits, int Offset = 0, int AdjustOffset = 0>
  void addConstantSImmOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    int64_t Imm = getConstantImm() - Offset;
    Imm = SignExtend64<Bits>(Imm);
    Imm += Offset;
    Imm += AdjustOffset;
    Inst.addOperand(MCOperand::createImm(Imm));
  }
 
  void addImmOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
    const MCExpr *Expr = getImm();
    addExpr(Inst, Expr);
  }
 
  void addMemOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
 
    Inst.addOperand(MCOperand::createReg(AsmParser.getABI().ArePtrs64bit()
                                             ? getMemBase()->getGPR64Reg()
                                             : getMemBase()->getGPR32Reg()));
 
    const MCExpr *Expr = getMemOff();
    addExpr(Inst, Expr);
  }
 
  void addMicroMipsMemOperands(MCInst &Inst, unsigned N) const {
    assert(N == 2 && "Invalid number of operands!");
 
    Inst.addOperand(MCOperand::createReg(getMemBase()->getGPRMM16Reg()));
 
    const MCExpr *Expr = getMemOff();
    addExpr(Inst, Expr);
  }
 
  void addRegListOperands(MCInst &Inst, unsigned N) const {
    assert(N == 1 && "Invalid number of operands!");
 
    for (auto RegNo : getRegList())
      Inst.addOperand(MCOperand::createReg(RegNo));
  }
 
  bool isReg() const override {
    // As a special case until we sort out the definition of div/divu, accept
    // $0/$zero here so that MCK_ZERO works correctly.
    return isGPRAsmReg() && RegIdx.Index == 0;
  }
 
  bool isRegIdx() const { return Kind == k_RegisterIndex; }
  bool isImm() const override { return Kind == k_Immediate; }
 
  bool isConstantImm() const {
    int64_t Res;
    return isImm() && getImm()->evaluateAsAbsolute(Res);
  }
 
  bool isConstantImmz() const {
    return isConstantImm() && getConstantImm() == 0;
  }
 
  template <unsigned Bits, int Offset = 0> bool isConstantUImm() const {
    return isConstantImm() && isUInt<Bits>(getConstantImm() - Offset);
  }
 
  template <unsigned Bits> bool isSImm() const {
    return isConstantImm() ? isInt<Bits>(getConstantImm()) : isImm();
  }
 
  template <unsigned Bits> bool isUImm() const {
    return isConstantImm() ? isUInt<Bits>(getConstantImm()) : isImm();
  }
 
  template <unsigned Bits> bool isAnyImm() const {
    return isConstantImm() ? (isInt<Bits>(getConstantImm()) ||
                              isUInt<Bits>(getConstantImm()))
                           : isImm();
  }
 
  template <unsigned Bits, int Offset = 0> bool isConstantSImm() const {
    return isConstantImm() && isInt<Bits>(getConstantImm() - Offset);
  }
 
  template <unsigned Bottom, unsigned Top> bool isConstantUImmRange() const {
    return isConstantImm() && getConstantImm() >= Bottom &&
           getConstantImm() <= Top;
  }
 
  bool isToken() const override {
    // Note: It's not possible to pretend that other operand kinds are tokens.
    // The matcher emitter checks tokens first.
    return Kind == k_Token;
  }
 
  bool isMem() const override { return Kind == k_Memory; }
 
  bool isConstantMemOff() const {
    return isMem() && isa<MCConstantExpr>(getMemOff());
  }
 
  // Allow relocation operators.
  template <unsigned Bits, unsigned ShiftAmount = 0>
  bool isMemWithSimmOffset() const {
    if (!isMem())
      return false;
    if (!getMemBase()->isGPRAsmReg())
      return false;
    if (isa<MCTargetExpr>(getMemOff()) ||
        (isConstantMemOff() &&
         isShiftedInt<Bits, ShiftAmount>(getConstantMemOff())))
      return true;
    MCValue Res;
    bool IsReloc = getMemOff()->evaluateAsRelocatable(Res, nullptr, nullptr);
    return IsReloc && isShiftedInt<Bits, ShiftAmount>(Res.getConstant());
  }
 
  bool isMemWithPtrSizeOffset() const {
    if (!isMem())
      return false;
    if (!getMemBase()->isGPRAsmReg())
      return false;
    const unsigned PtrBits = AsmParser.getABI().ArePtrs64bit() ? 64 : 32;
    if (isa<MCTargetExpr>(getMemOff()) ||
        (isConstantMemOff() && isIntN(PtrBits, getConstantMemOff())))
      return true;
    MCValue Res;
    bool IsReloc = getMemOff()->evaluateAsRelocatable(Res, nullptr, nullptr);
    return IsReloc && isIntN(PtrBits, Res.getConstant());
  }
 
  bool isMemWithGRPMM16Base() const {
    return isMem() && getMemBase()->isMM16AsmReg();
  }
 
  template <unsigned Bits> bool isMemWithUimmOffsetSP() const {
    return isMem() && isConstantMemOff() && isUInt<Bits>(getConstantMemOff())
      && getMemBase()->isRegIdx() && (getMemBase()->getGPR32Reg() == Mips::SP);
  }
 
  template <unsigned Bits> bool isMemWithUimmWordAlignedOffsetSP() const {
    return isMem() && isConstantMemOff() && isUInt<Bits>(getConstantMemOff())
      && (getConstantMemOff() % 4 == 0) && getMemBase()->isRegIdx()
      && (getMemBase()->getGPR32Reg() == Mips::SP);
  }
 
  template <unsigned Bits> bool isMemWithSimmWordAlignedOffsetGP() const {
    return isMem() && isConstantMemOff() && isInt<Bits>(getConstantMemOff())
      && (getConstantMemOff() % 4 == 0) && getMemBase()->isRegIdx()
      && (getMemBase()->getGPR32Reg() == Mips::GP);
  }
 
  template <unsigned Bits, unsigned ShiftLeftAmount>
  bool isScaledUImm() const {
    return isConstantImm() &&
           isShiftedUInt<Bits, ShiftLeftAmount>(getConstantImm());
  }
 
  template <unsigned Bits, unsigned ShiftLeftAmount>
  bool isScaledSImm() const {
    if (isConstantImm() &&
        isShiftedInt<Bits, ShiftLeftAmount>(getConstantImm()))
      return true;
    // Operand can also be a symbol or symbol plus
    // offset in case of relocations.
    if (Kind != k_Immediate)
      return false;
    MCValue Res;
    bool Success = getImm()->evaluateAsRelocatable(Res, nullptr, nullptr);
    return Success && isShiftedInt<Bits, ShiftLeftAmount>(Res.getConstant());
  }
 
  bool isRegList16() const {
    if (!isRegList())
      return false;
 
    int Size = RegList.List->size();
    if (Size < 2 || Size > 5)
      return false;
 
    unsigned R0 = RegList.List->front();
    unsigned R1 = RegList.List->back();
    if (!((R0 == Mips::S0 && R1 == Mips::RA) ||
          (R0 == Mips::S0_64 && R1 == Mips::RA_64)))
      return false;
 
    int PrevReg = *RegList.List->begin();
    for (int i = 1; i < Size - 1; i++) {
      int Reg = (*(RegList.List))[i];
      if ( Reg != PrevReg + 1)
        return false;
      PrevReg = Reg;
    }
 
    return true;
  }
 
  bool isInvNum() const { return Kind == k_Immediate; }
 
  bool isLSAImm() const {
    if (!isConstantImm())
      return false;
    int64_t Val = getConstantImm();
    return 1 <= Val && Val <= 4;
  }
 
  bool isRegList() const { return Kind == k_RegList; }
 
  StringRef getToken() const {
    assert(Kind == k_Token && "Invalid access!");
    return StringRef(Tok.Data, Tok.Length);
  }
 
  MCRegister getReg() const override {
    // As a special case until we sort out the definition of div/divu, accept
    // $0/$zero here so that MCK_ZERO works correctly.
    if (Kind == k_RegisterIndex && RegIdx.Index == 0 &&
        RegIdx.Kind & RegKind_GPR)
      return getGPR32Reg(); // FIXME: GPR64 too
 
    llvm_unreachable("Invalid access!");
    return 0;
  }
 
  const MCExpr *getImm() const {
    assert((Kind == k_Immediate) && "Invalid access!");
    return Imm.Val;
  }
 
  int64_t getConstantImm() const {
    const MCExpr *Val = getImm();
    int64_t Value = 0;
    (void)Val->evaluateAsAbsolute(Value);
    return Value;
  }
 
  MipsOperand *getMemBase() const {
    assert((Kind == k_Memory) && "Invalid access!");
    return Mem.Base;
  }
 
  const MCExpr *getMemOff() const {
    assert((Kind == k_Memory) && "Invalid access!");
    return Mem.Off;
  }
 
  int64_t getConstantMemOff() const {
    return static_cast<const MCConstantExpr *>(getMemOff())->getValue();
  }
 
  const SmallVectorImpl<unsigned> &getRegList() const {
    assert((Kind == k_RegList) && "Invalid access!");
    return *(RegList.List);
  }
 
  static std::unique_ptr<MipsOperand> CreateToken(StringRef Str, SMLoc S,
                                                  MipsAsmParser &Parser) {
    auto Op = std::make_unique<MipsOperand>(k_Token, Parser);
    Op->Tok.Data = Str.data();
    Op->Tok.Length = Str.size();
    Op->StartLoc = S;
    Op->EndLoc = S;
    return Op;
  }
 
  /// Create a numeric register (e.g. $1). The exact register remains
  /// unresolved until an instruction successfully matches
  static std::unique_ptr<MipsOperand>
  createNumericReg(unsigned Index, StringRef Str, const MCRegisterInfo *RegInfo,
                   SMLoc S, SMLoc E, MipsAsmParser &Parser) {
    LLVM_DEBUG(dbgs() << "createNumericReg(" << Index << ", ...)\n");
    return CreateReg(Index, Str, RegKind_Numeric, RegInfo, S, E, Parser);
  }
 
  /// Create a register that is definitely a GPR.
  /// This is typically only used for named registers such as $gp.
  static std::unique_ptr<MipsOperand>
  createGPRReg(unsigned Index, StringRef Str, const MCRegisterInfo *RegInfo,
               SMLoc S, SMLoc E, MipsAsmParser &Parser) {
    return CreateReg(Index, Str, RegKind_GPR, RegInfo, S, E, Parser);
  }
 
  /// Create a register that is definitely a FGR.
  /// This is typically only used for named registers such as $f0.
  static std::unique_ptr<MipsOperand>
  createFGRReg(unsigned Index, StringRef Str, const MCRegisterInfo *RegInfo,
               SMLoc S, SMLoc E, MipsAsmParser &Parser) {
    return CreateReg(Index, Str, RegKind_FGR, RegInfo, S, E, Parser);
  }
 
  /// Create a register that is definitely a HWReg.
  /// This is typically only used for named registers such as $hwr_cpunum.
  static std::unique_ptr<MipsOperand>
  createHWRegsReg(unsigned Index, StringRef Str, const MCRegisterInfo *RegInfo,
                  SMLoc S, SMLoc E, MipsAsmParser &Parser) {
    return CreateReg(Index, Str, RegKind_HWRegs, RegInfo, S, E, Parser);
  }
 
  /// Create a register that is definitely an FCC.
  /// This is typically only used for named registers such as $fcc0.
  static std::unique_ptr<MipsOperand>
  createFCCReg(unsigned Index, StringRef Str, const MCRegisterInfo *RegInfo,
               SMLoc S, SMLoc E, MipsAsmParser &Parser) {
    return CreateReg(Index, Str, RegKind_FCC, RegInfo, S, E, Parser);
  }
 
  /// Create a register that is definitely an ACC.
  /// This is typically only used for named registers such as $ac0.
  static std::unique_ptr<MipsOperand>
  createACCReg(unsigned Index, StringRef Str, const MCRegisterInfo *RegInfo,
               SMLoc S, SMLoc E, MipsAsmParser &Parser) {
    return CreateReg(Index, Str, RegKind_ACC, RegInfo, S, E, Parser);
  }
 
  /// Create a register that is definitely an MSA128.
  /// This is typically only used for named registers such as $w0.
  static std::unique_ptr<MipsOperand>
  createMSA128Reg(unsigned Index, StringRef Str, const MCRegisterInfo *RegInfo,
                  SMLoc S, SMLoc E, MipsAsmParser &Parser) {
    return CreateReg(Index, Str, RegKind_MSA128, RegInfo, S, E, Parser);
  }
 
  /// Create a register that is definitely an MSACtrl.
  /// This is typically only used for named registers such as $msaaccess.
  static std::unique_ptr<MipsOperand>
  createMSACtrlReg(unsigned Index, StringRef Str, const MCRegisterInfo *RegInfo,
                   SMLoc S, SMLoc E, MipsAsmParser &Parser) {
    return CreateReg(Index, Str, RegKind_MSACtrl, RegInfo, S, E, Parser);
  }
 
  static std::unique_ptr<MipsOperand>
  CreateImm(const MCExpr *Val, SMLoc S, SMLoc E, MipsAsmParser &Parser) {
    auto Op = std::make_unique<MipsOperand>(k_Immediate, Parser);
    Op->Imm.Val = Val;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<MipsOperand>
  CreateMem(std::unique_ptr<MipsOperand> Base, const MCExpr *Off, SMLoc S,
            SMLoc E, MipsAsmParser &Parser) {
    auto Op = std::make_unique<MipsOperand>(k_Memory, Parser);
    Op->Mem.Base = Base.release();
    Op->Mem.Off = Off;
    Op->StartLoc = S;
    Op->EndLoc = E;
    return Op;
  }
 
  static std::unique_ptr<MipsOperand>
  CreateRegList(SmallVectorImpl<unsigned> &Regs, SMLoc StartLoc, SMLoc EndLoc,
                MipsAsmParser &Parser) {
    assert(Regs.size() > 0 && "Empty list not allowed");
 
    auto Op = std::make_unique<MipsOperand>(k_RegList, Parser);
    Op->RegList.List = new SmallVector<unsigned, 10>(Regs.begin(), Regs.end());
    Op->StartLoc = StartLoc;
    Op->EndLoc = EndLoc;
    return Op;
  }
 
 bool isGPRZeroAsmReg() const {
    return isRegIdx() && RegIdx.Kind & RegKind_GPR && RegIdx.Index == 0;
  }
 
 bool isGPRNonZeroAsmReg() const {
   return isRegIdx() && RegIdx.Kind & RegKind_GPR && RegIdx.Index > 0 &&
          RegIdx.Index <= 31;
  }
 
  bool isGPRAsmReg() const {
    return isRegIdx() && RegIdx.Kind & RegKind_GPR && RegIdx.Index <= 31;
  }
 
  bool isMM16AsmReg() const {
    if (!(isRegIdx() && RegIdx.Kind))
      return false;
    return ((RegIdx.Index >= 2 && RegIdx.Index <= 7)
            || RegIdx.Index == 16 || RegIdx.Index == 17);
 
  }
  bool isMM16AsmRegZero() const {
    if (!(isRegIdx() && RegIdx.Kind))
      return false;
    return (RegIdx.Index == 0 ||
            (RegIdx.Index >= 2 && RegIdx.Index <= 7) ||
            RegIdx.Index == 17);
  }
 
  bool isMM16AsmRegMoveP() const {
    if (!(isRegIdx() && RegIdx.Kind))
      return false;
    return (RegIdx.Index == 0 || (RegIdx.Index >= 2 && RegIdx.Index <= 3) ||
      (RegIdx.Index >= 16 && RegIdx.Index <= 20));
  }
 
  bool isMM16AsmRegMovePPairFirst() const {
    if (!(isRegIdx() && RegIdx.Kind))
      return false;
    return RegIdx.Index >= 4 && RegIdx.Index <= 6;
  }
 
  bool isMM16AsmRegMovePPairSecond() const {
    if (!(isRegIdx() && RegIdx.Kind))
      return false;
    return (RegIdx.Index == 21 || RegIdx.Index == 22 ||
      (RegIdx.Index >= 5 && RegIdx.Index <= 7));
  }
 
  bool isFGRAsmReg() const {
    // AFGR64 is $0-$15 but we handle this in getAFGR64()
    return isRegIdx() && RegIdx.Kind & RegKind_FGR && RegIdx.Index <= 31;
  }
 
  bool isStrictlyFGRAsmReg() const {
    // AFGR64 is $0-$15 but we handle this in getAFGR64()
    return isRegIdx() && RegIdx.Kind == RegKind_FGR && RegIdx.Index <= 31;
  }
 
  bool isHWRegsAsmReg() const {
    return isRegIdx() && RegIdx.Kind & RegKind_HWRegs && RegIdx.Index <= 31;
  }
 
  bool isCCRAsmReg() const {
    return isRegIdx() && RegIdx.Kind & RegKind_CCR && RegIdx.Index <= 31;
  }
 
  bool isFCCAsmReg() const {
    if (!(isRegIdx() && RegIdx.Kind & RegKind_FCC))
      return false;
    return RegIdx.Index <= 7;
  }
 
  bool isACCAsmReg() const {
    return isRegIdx() && RegIdx.Kind & RegKind_ACC && RegIdx.Index <= 3;
  }
 
  bool isCOP0AsmReg() const {
    return isRegIdx() && RegIdx.Kind & RegKind_COP0 && RegIdx.Index <= 31;
  }
 
  bool isCOP2AsmReg() const {
    return isRegIdx() && RegIdx.Kind & RegKind_COP2 && RegIdx.Index <= 31;
  }
 
  bool isCOP3AsmReg() const {
    return isRegIdx() && RegIdx.Kind & RegKind_COP3 && RegIdx.Index <= 31;
  }
 
  bool isMSA128AsmReg() const {
    return isRegIdx() && RegIdx.Kind & RegKind_MSA128 && RegIdx.Index <= 31;
  }
 
  bool isMSACtrlAsmReg() const {
    return isRegIdx() && RegIdx.Kind & RegKind_MSACtrl && RegIdx.Index <= 7;
  }
 
  /// 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; }
 
  void print(raw_ostream &OS) const override {
    switch (Kind) {
    case k_Immediate:
      OS << "Imm<";
      OS << *Imm.Val;
      OS << ">";
      break;
    case k_Memory:
      OS << "Mem<";
      Mem.Base->print(OS);
      OS << ", ";
      OS << *Mem.Off;
      OS << ">";
      break;
    case k_RegisterIndex:
      OS << "RegIdx<" << RegIdx.Index << ":" << RegIdx.Kind << ", "
         << StringRef(RegIdx.Tok.Data, RegIdx.Tok.Length) << ">";
      break;
    case k_Token:
      OS << getToken();
      break;
    case k_RegList:
      OS << "RegList< ";
      for (auto Reg : (*RegList.List))
        OS << Reg << " ";
      OS <<  ">";
      break;
    }
  }
 
  bool isValidForTie(const MipsOperand &Other) const {
    if (Kind != Other.Kind)
      return false;
 
    switch (Kind) {
    default:
      llvm_unreachable("Unexpected kind");
      return false;
    case k_RegisterIndex: {
      StringRef Token(RegIdx.Tok.Data, RegIdx.Tok.Length);
      StringRef OtherToken(Other.RegIdx.Tok.Data, Other.RegIdx.Tok.Length);
      return Token == OtherToken;
    }
    }
  }
}; // class MipsOperand
 
} // end anonymous namespace
 
static bool hasShortDelaySlot(MCInst &Inst) {
  switch (Inst.getOpcode()) {
    case Mips::BEQ_MM:
    case Mips::BNE_MM:
    case Mips::BLTZ_MM:
    case Mips::BGEZ_MM:
    case Mips::BLEZ_MM:
    case Mips::BGTZ_MM:
    case Mips::JRC16_MM:
    case Mips::JALS_MM:
    case Mips::JALRS_MM:
    case Mips::JALRS16_MM:
    case Mips::BGEZALS_MM:
    case Mips::BLTZALS_MM:
      return true;
    case Mips::J_MM:
      return !Inst.getOperand(0).isReg();
    default:
      return false;
  }
}
 
static const MCSymbol *getSingleMCSymbol(const MCExpr *Expr) {
  if (const MCSymbolRefExpr *SRExpr = dyn_cast<MCSymbolRefExpr>(Expr)) {
    return &SRExpr->getSymbol();
  }
 
  if (const MCBinaryExpr *BExpr = dyn_cast<MCBinaryExpr>(Expr)) {
    const MCSymbol *LHSSym = getSingleMCSymbol(BExpr->getLHS());
    const MCSymbol *RHSSym = getSingleMCSymbol(BExpr->getRHS());
 
    if (LHSSym)
      return LHSSym;
 
    if (RHSSym)
      return RHSSym;
 
    return nullptr;
  }
 
  if (const MCUnaryExpr *UExpr = dyn_cast<MCUnaryExpr>(Expr))
    return getSingleMCSymbol(UExpr->getSubExpr());
 
  return nullptr;
}
 
static unsigned countMCSymbolRefExpr(const MCExpr *Expr) {
  if (isa<MCSymbolRefExpr>(Expr))
    return 1;
 
  if (const MCBinaryExpr *BExpr = dyn_cast<MCBinaryExpr>(Expr))
    return countMCSymbolRefExpr(BExpr->getLHS()) +
           countMCSymbolRefExpr(BExpr->getRHS());
 
  if (const MCUnaryExpr *UExpr = dyn_cast<MCUnaryExpr>(Expr))
    return countMCSymbolRefExpr(UExpr->getSubExpr());
 
  return 0;
}
 
static bool isEvaluated(const MCExpr *Expr) {
  switch (Expr->getKind()) {
  case MCExpr::Constant:
    return true;
  case MCExpr::SymbolRef:
    return (cast<MCSymbolRefExpr>(Expr)->getKind() != MCSymbolRefExpr::VK_None);
  case MCExpr::Binary: {
    const MCBinaryExpr *BE = cast<MCBinaryExpr>(Expr);
    if (!isEvaluated(BE->getLHS()))
      return false;
    return isEvaluated(BE->getRHS());
  }
  case MCExpr::Unary:
    return isEvaluated(cast<MCUnaryExpr>(Expr)->getSubExpr());
  case MCExpr::Target:
    return true;
  }
  return false;
}
 
static bool needsExpandMemInst(MCInst &Inst, const MCInstrDesc &MCID) {
  unsigned NumOp = MCID.getNumOperands();
  if (NumOp != 3 && NumOp != 4)
    return false;
 
  const MCOperandInfo &OpInfo = MCID.operands()[NumOp - 1];
  if (OpInfo.OperandType != MCOI::OPERAND_MEMORY &&
      OpInfo.OperandType != MCOI::OPERAND_UNKNOWN &&
      OpInfo.OperandType != MipsII::OPERAND_MEM_SIMM9)
    return false;
 
  MCOperand &Op = Inst.getOperand(NumOp - 1);
  if (Op.isImm()) {
    if (OpInfo.OperandType == MipsII::OPERAND_MEM_SIMM9)
      return !isInt<9>(Op.getImm());
    // Offset can't exceed 16bit value.
    return !isInt<16>(Op.getImm());
  }
 
  if (Op.isExpr()) {
    const MCExpr *Expr = Op.getExpr();
    if (Expr->getKind() != MCExpr::SymbolRef)
      return !isEvaluated(Expr);
 
    // Expand symbol.
    const MCSymbolRefExpr *SR = static_cast<const MCSymbolRefExpr *>(Expr);
    return SR->getKind() == MCSymbolRefExpr::VK_None;
  }
 
  return false;
}
 
bool MipsAsmParser::processInstruction(MCInst &Inst, SMLoc IDLoc,
                                       MCStreamer &Out,
                                       const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
  const unsigned Opcode = Inst.getOpcode();
  const MCInstrDesc &MCID = MII.get(Opcode);
  bool ExpandedJalSym = false;
 
  Inst.setLoc(IDLoc);
 
  if (MCID.isBranch() || MCID.isCall()) {
    MCOperand Offset;
 
    switch (Opcode) {
    default:
      break;
    case Mips::BBIT0:
    case Mips::BBIT032:
    case Mips::BBIT1:
    case Mips::BBIT132:
      assert(hasCnMips() && "instruction only valid for octeon cpus");
      [[fallthrough]];
 
    case Mips::BEQ:
    case Mips::BNE:
    case Mips::BEQ_MM:
    case Mips::BNE_MM:
      assert(MCID.getNumOperands() == 3 && "unexpected number of operands");
      Offset = Inst.getOperand(2);
      if (!Offset.isImm())
        break; // We'll deal with this situation later on when applying fixups.
      if (!isIntN(inMicroMipsMode() ? 17 : 18, Offset.getImm()))
        return Error(IDLoc, "branch target out of range");
      if (offsetToAlignment(Offset.getImm(),
                            (inMicroMipsMode() ? Align(2) : Align(4))))
        return Error(IDLoc, "branch to misaligned address");
      break;
    case Mips::BGEZ:
    case Mips::BGTZ:
    case Mips::BLEZ:
    case Mips::BLTZ:
    case Mips::BGEZAL:
    case Mips::BLTZAL:
    case Mips::BC1F:
    case Mips::BC1T:
    case Mips::BGEZ_MM:
    case Mips::BGTZ_MM:
    case Mips::BLEZ_MM:
    case Mips::BLTZ_MM:
    case Mips::BGEZAL_MM:
    case Mips::BLTZAL_MM:
    case Mips::BC1F_MM:
    case Mips::BC1T_MM:
    case Mips::BC1EQZC_MMR6:
    case Mips::BC1NEZC_MMR6:
    case Mips::BC2EQZC_MMR6:
    case Mips::BC2NEZC_MMR6:
      assert(MCID.getNumOperands() == 2 && "unexpected number of operands");
      Offset = Inst.getOperand(1);
      if (!Offset.isImm())
        break; // We'll deal with this situation later on when applying fixups.
      if (!isIntN(inMicroMipsMode() ? 17 : 18, Offset.getImm()))
        return Error(IDLoc, "branch target out of range");
      if (offsetToAlignment(Offset.getImm(),
                            (inMicroMipsMode() ? Align(2) : Align(4))))
        return Error(IDLoc, "branch to misaligned address");
      break;
    case Mips::BGEC:    case Mips::BGEC_MMR6:
    case Mips::BLTC:    case Mips::BLTC_MMR6:
    case Mips::BGEUC:   case Mips::BGEUC_MMR6:
    case Mips::BLTUC:   case Mips::BLTUC_MMR6:
    case Mips::BEQC:    case Mips::BEQC_MMR6:
    case Mips::BNEC:    case Mips::BNEC_MMR6:
      assert(MCID.getNumOperands() == 3 && "unexpected number of operands");
      Offset = Inst.getOperand(2);
      if (!Offset.isImm())
        break; // We'll deal with this situation later on when applying fixups.
      if (!isIntN(18, Offset.getImm()))
        return Error(IDLoc, "branch target out of range");
      if (offsetToAlignment(Offset.getImm(), Align(4)))
        return Error(IDLoc, "branch to misaligned address");
      break;
    case Mips::BLEZC:   case Mips::BLEZC_MMR6:
    case Mips::BGEZC:   case Mips::BGEZC_MMR6:
    case Mips::BGTZC:   case Mips::BGTZC_MMR6:
    case Mips::BLTZC:   case Mips::BLTZC_MMR6:
      assert(MCID.getNumOperands() == 2 && "unexpected number of operands");
      Offset = Inst.getOperand(1);
      if (!Offset.isImm())
        break; // We'll deal with this situation later on when applying fixups.
      if (!isIntN(18, Offset.getImm()))
        return Error(IDLoc, "branch target out of range");
      if (offsetToAlignment(Offset.getImm(), Align(4)))
        return Error(IDLoc, "branch to misaligned address");
      break;
    case Mips::BEQZC:   case Mips::BEQZC_MMR6:
    case Mips::BNEZC:   case Mips::BNEZC_MMR6:
      assert(MCID.getNumOperands() == 2 && "unexpected number of operands");
      Offset = Inst.getOperand(1);
      if (!Offset.isImm())
        break; // We'll deal with this situation later on when applying fixups.
      if (!isIntN(23, Offset.getImm()))
        return Error(IDLoc, "branch target out of range");
      if (offsetToAlignment(Offset.getImm(), Align(4)))
        return Error(IDLoc, "branch to misaligned address");
      break;
    case Mips::BEQZ16_MM:
    case Mips::BEQZC16_MMR6:
    case Mips::BNEZ16_MM:
    case Mips::BNEZC16_MMR6:
      assert(MCID.getNumOperands() == 2 && "unexpected number of operands");
      Offset = Inst.getOperand(1);
      if (!Offset.isImm())
        break; // We'll deal with this situation later on when applying fixups.
      if (!isInt<8>(Offset.getImm()))
        return Error(IDLoc, "branch target out of range");
      if (offsetToAlignment(Offset.getImm(), Align(2)))
        return Error(IDLoc, "branch to misaligned address");
      break;
    }
  }
 
  // SSNOP is deprecated on MIPS32r6/MIPS64r6
  // We still accept it but it is a normal nop.
  if (hasMips32r6() && Opcode == Mips::SSNOP) {
    std::string ISA = hasMips64r6() ? "MIPS64r6" : "MIPS32r6";
    Warning(IDLoc, "ssnop is deprecated for " + ISA + " and is equivalent to a "
                                                      "nop instruction");
  }
 
  if (hasCnMips()) {
    MCOperand Opnd;
    int Imm;
 
    switch (Opcode) {
      default:
        break;
 
      case Mips::BBIT0:
      case Mips::BBIT032:
      case Mips::BBIT1:
      case Mips::BBIT132:
        assert(MCID.getNumOperands() == 3 && "unexpected number of operands");
        // The offset is handled above
        Opnd = Inst.getOperand(1);
        if (!Opnd.isImm())
          return Error(IDLoc, "expected immediate operand kind");
        Imm = Opnd.getImm();
        if (Imm < 0 || Imm > (Opcode == Mips::BBIT0 ||
                              Opcode == Mips::BBIT1 ? 63 : 31))
          return Error(IDLoc, "immediate operand value out of range");
        if (Imm > 31) {
          Inst.setOpcode(Opcode == Mips::BBIT0 ? Mips::BBIT032
                                               : Mips::BBIT132);
          Inst.getOperand(1).setImm(Imm - 32);
        }
        break;
 
      case Mips::SEQi:
      case Mips::SNEi:
        assert(MCID.getNumOperands() == 3 && "unexpected number of operands");
        Opnd = Inst.getOperand(2);
        if (!Opnd.isImm())
          return Error(IDLoc, "expected immediate operand kind");
        Imm = Opnd.getImm();
        if (!isInt<10>(Imm))
          return Error(IDLoc, "immediate operand value out of range");
        break;
    }
  }
 
  // Warn on division by zero. We're checking here as all instructions get
  // processed here, not just the macros that need expansion.
  //
  // The MIPS backend models most of the divison instructions and macros as
  // three operand instructions. The pre-R6 divide instructions however have
  // two operands and explicitly define HI/LO as part of the instruction,
  // not in the operands.
  unsigned FirstOp = 1;
  unsigned SecondOp = 2;
  switch (Opcode) {
  default:
    break;
  case Mips::SDivIMacro:
  case Mips::UDivIMacro:
  case Mips::DSDivIMacro:
  case Mips::DUDivIMacro:
    if (Inst.getOperand(2).getImm() == 0) {
      if (Inst.getOperand(1).getReg() == Mips::ZERO ||
          Inst.getOperand(1).getReg() == Mips::ZERO_64)
        Warning(IDLoc, "dividing zero by zero");
      else
        Warning(IDLoc, "division by zero");
    }
    break;
  case Mips::DSDIV:
  case Mips::SDIV:
  case Mips::UDIV:
  case Mips::DUDIV:
  case Mips::UDIV_MM:
  case Mips::SDIV_MM:
    FirstOp = 0;
    SecondOp = 1;
    [[fallthrough]];
  case Mips::SDivMacro:
  case Mips::DSDivMacro:
  case Mips::UDivMacro:
  case Mips::DUDivMacro:
  case Mips::DIV:
  case Mips::DIVU:
  case Mips::DDIV:
  case Mips::DDIVU:
  case Mips::DIVU_MMR6:
  case Mips::DIV_MMR6:
    if (Inst.getOperand(SecondOp).getReg() == Mips::ZERO ||
        Inst.getOperand(SecondOp).getReg() == Mips::ZERO_64) {
      if (Inst.getOperand(FirstOp).getReg() == Mips::ZERO ||
          Inst.getOperand(FirstOp).getReg() == Mips::ZERO_64)
        Warning(IDLoc, "dividing zero by zero");
      else
        Warning(IDLoc, "division by zero");
    }
    break;
  }
 
  // For PIC code convert unconditional jump to unconditional branch.
  if ((Opcode == Mips::J || Opcode == Mips::J_MM) && inPicMode()) {
    MCInst BInst;
    BInst.setOpcode(inMicroMipsMode() ? Mips::BEQ_MM : Mips::BEQ);
    BInst.addOperand(MCOperand::createReg(Mips::ZERO));
    BInst.addOperand(MCOperand::createReg(Mips::ZERO));
    BInst.addOperand(Inst.getOperand(0));
    Inst = BInst;
  }
 
  // This expansion is not in a function called by tryExpandInstruction()
  // because the pseudo-instruction doesn't have a distinct opcode.
  if ((Opcode == Mips::JAL || Opcode == Mips::JAL_MM) && inPicMode()) {
    warnIfNoMacro(IDLoc);
 
    const MCExpr *JalExpr = Inst.getOperand(0).getExpr();
 
    // We can do this expansion if there's only 1 symbol in the argument
    // expression.
    if (countMCSymbolRefExpr(JalExpr) > 1)
      return Error(IDLoc, "jal doesn't support multiple symbols in PIC mode");
 
    // FIXME: This is checking the expression can be handled by the later stages
    //        of the assembler. We ought to leave it to those later stages.
    const MCSymbol *JalSym = getSingleMCSymbol(JalExpr);
 
    if (expandLoadAddress(Mips::T9, Mips::NoRegister, Inst.getOperand(0),
                          !isGP64bit(), IDLoc, Out, STI))
      return true;
 
    MCInst JalrInst;
    if (inMicroMipsMode())
      JalrInst.setOpcode(IsCpRestoreSet ? Mips::JALRS_MM : Mips::JALR_MM);
    else
      JalrInst.setOpcode(Mips::JALR);
    JalrInst.addOperand(MCOperand::createReg(Mips::RA));
    JalrInst.addOperand(MCOperand::createReg(Mips::T9));
 
    if (isJalrRelocAvailable(JalExpr)) {
      // As an optimization hint for the linker, before the JALR we add:
      // .reloc tmplabel, R_{MICRO}MIPS_JALR, symbol
      // tmplabel:
      MCSymbol *TmpLabel = getContext().createTempSymbol();
      const MCExpr *TmpExpr = MCSymbolRefExpr::create(TmpLabel, getContext());
      const MCExpr *RelocJalrExpr =
          MCSymbolRefExpr::create(JalSym, MCSymbolRefExpr::VK_None,
                                  getContext(), IDLoc);
 
      TOut.getStreamer().emitRelocDirective(
          *TmpExpr, inMicroMipsMode() ? "R_MICROMIPS_JALR" : "R_MIPS_JALR",
          RelocJalrExpr, IDLoc, *STI);
      TOut.getStreamer().emitLabel(TmpLabel);
    }
 
    Inst = JalrInst;
    ExpandedJalSym = true;
  }
 
  if (MCID.mayLoad() || MCID.mayStore()) {
    // Check the offset of memory operand, if it is a symbol
    // reference or immediate we may have to expand instructions.
    if (needsExpandMemInst(Inst, MCID)) {
      switch (MCID.operands()[MCID.getNumOperands() - 1].OperandType) {
      case MipsII::OPERAND_MEM_SIMM9:
        expandMem9Inst(Inst, IDLoc, Out, STI, MCID.mayLoad());
        break;
      default:
        expandMem16Inst(Inst, IDLoc, Out, STI, MCID.mayLoad());
        break;
      }
      return getParser().hasPendingError();
    }
  }
 
  if (inMicroMipsMode()) {
    if (MCID.mayLoad() && Opcode != Mips::LWP_MM) {
      // Try to create 16-bit GP relative load instruction.
      for (unsigned i = 0; i < MCID.getNumOperands(); i++) {
        const MCOperandInfo &OpInfo = MCID.operands()[i];
        if ((OpInfo.OperandType == MCOI::OPERAND_MEMORY) ||
            (OpInfo.OperandType == MCOI::OPERAND_UNKNOWN)) {
          MCOperand &Op = Inst.getOperand(i);
          if (Op.isImm()) {
            int MemOffset = Op.getImm();
            MCOperand &DstReg = Inst.getOperand(0);
            MCOperand &BaseReg = Inst.getOperand(1);
            if (isInt<9>(MemOffset) && (MemOffset % 4 == 0) &&
                getContext().getRegisterInfo()->getRegClass(
                  Mips::GPRMM16RegClassID).contains(DstReg.getReg()) &&
                (BaseReg.getReg() == Mips::GP ||
                BaseReg.getReg() == Mips::GP_64)) {
 
              TOut.emitRRI(Mips::LWGP_MM, DstReg.getReg(), Mips::GP, MemOffset,
                           IDLoc, STI);
              return false;
            }
          }
        }
      } // for
    }   // if load
 
    // TODO: Handle this with the AsmOperandClass.PredicateMethod.
 
    MCOperand Opnd;
    int Imm;
 
    switch (Opcode) {
      default:
        break;
      case Mips::ADDIUSP_MM:
        Opnd = Inst.getOperand(0);
        if (!Opnd.isImm())
          return Error(IDLoc, "expected immediate operand kind");
        Imm = Opnd.getImm();
        if (Imm < -1032 || Imm > 1028 || (Imm < 8 && Imm > -12) ||
            Imm % 4 != 0)
          return Error(IDLoc, "immediate operand value out of range");
        break;
      case Mips::SLL16_MM:
      case Mips::SRL16_MM:
        Opnd = Inst.getOperand(2);
        if (!Opnd.isImm())
          return Error(IDLoc, "expected immediate operand kind");
        Imm = Opnd.getImm();
        if (Imm < 1 || Imm > 8)
          return Error(IDLoc, "immediate operand value out of range");
        break;
      case Mips::LI16_MM:
        Opnd = Inst.getOperand(1);
        if (!Opnd.isImm())
          return Error(IDLoc, "expected immediate operand kind");
        Imm = Opnd.getImm();
        if (Imm < -1 || Imm > 126)
          return Error(IDLoc, "immediate operand value out of range");
        break;
      case Mips::ADDIUR2_MM:
        Opnd = Inst.getOperand(2);
        if (!Opnd.isImm())
          return Error(IDLoc, "expected immediate operand kind");
        Imm = Opnd.getImm();
        if (!(Imm == 1 || Imm == -1 ||
              ((Imm % 4 == 0) && Imm < 28 && Imm > 0)))
          return Error(IDLoc, "immediate operand value out of range");
        break;
      case Mips::ANDI16_MM:
        Opnd = Inst.getOperand(2);
        if (!Opnd.isImm())
          return Error(IDLoc, "expected immediate operand kind");
        Imm = Opnd.getImm();
        if (!(Imm == 128 || (Imm >= 1 && Imm <= 4) || Imm == 7 || Imm == 8 ||
              Imm == 15 || Imm == 16 || Imm == 31 || Imm == 32 || Imm == 63 ||
              Imm == 64 || Imm == 255 || Imm == 32768 || Imm == 65535))
          return Error(IDLoc, "immediate operand value out of range");
        break;
      case Mips::LBU16_MM:
        Opnd = Inst.getOperand(2);
        if (!Opnd.isImm())
          return Error(IDLoc, "expected immediate operand kind");
        Imm = Opnd.getImm();
        if (Imm < -1 || Imm > 14)
          return Error(IDLoc, "immediate operand value out of range");
        break;
      case Mips::SB16_MM:
      case Mips::SB16_MMR6:
        Opnd = Inst.getOperand(2);
        if (!Opnd.isImm())
          return Error(IDLoc, "expected immediate operand kind");
        Imm = Opnd.getImm();
        if (Imm < 0 || Imm > 15)
          return Error(IDLoc, "immediate operand value out of range");
        break;
      case Mips::LHU16_MM:
      case Mips::SH16_MM:
      case Mips::SH16_MMR6:
        Opnd = Inst.getOperand(2);
        if (!Opnd.isImm())
          return Error(IDLoc, "expected immediate operand kind");
        Imm = Opnd.getImm();
        if (Imm < 0 || Imm > 30 || (Imm % 2 != 0))
          return Error(IDLoc, "immediate operand value out of range");
        break;
      case Mips::LW16_MM:
      case Mips::SW16_MM:
      case Mips::SW16_MMR6:
        Opnd = Inst.getOperand(2);
        if (!Opnd.isImm())
          return Error(IDLoc, "expected immediate operand kind");
        Imm = Opnd.getImm();
        if (Imm < 0 || Imm > 60 || (Imm % 4 != 0))
          return Error(IDLoc, "immediate operand value out of range");
        break;
      case Mips::ADDIUPC_MM:
        Opnd = Inst.getOperand(1);
        if (!Opnd.isImm())
          return Error(IDLoc, "expected immediate operand kind");
        Imm = Opnd.getImm();
        if ((Imm % 4 != 0) || !isInt<25>(Imm))
          return Error(IDLoc, "immediate operand value out of range");
        break;
      case Mips::LWP_MM:
      case Mips::SWP_MM:
        if (Inst.getOperand(0).getReg() == Mips::RA)
          return Error(IDLoc, "invalid operand for instruction");
        break;
      case Mips::MOVEP_MM:
      case Mips::MOVEP_MMR6: {
        unsigned R0 = Inst.getOperand(0).getReg();
        unsigned R1 = Inst.getOperand(1).getReg();
        bool RegPair = ((R0 == Mips::A1 && R1 == Mips::A2) ||
                        (R0 == Mips::A1 && R1 == Mips::A3) ||
                        (R0 == Mips::A2 && R1 == Mips::A3) ||
                        (R0 == Mips::A0 && R1 == Mips::S5) ||
                        (R0 == Mips::A0 && R1 == Mips::S6) ||
                        (R0 == Mips::A0 && R1 == Mips::A1) ||
                        (R0 == Mips::A0 && R1 == Mips::A2) ||
                        (R0 == Mips::A0 && R1 == Mips::A3));
        if (!RegPair)
          return Error(IDLoc, "invalid operand for instruction");
        break;
      }
    }
  }
 
  bool FillDelaySlot =
      MCID.hasDelaySlot() && AssemblerOptions.back()->isReorder();
 
  // Get previous instruction`s forbidden slot attribute and
  // whether set reorder.
  bool PrevForbiddenSlotAttr = CurForbiddenSlotAttr;
 
  // Flag represents we set reorder after nop.
  bool SetReorderAfterNop = false;
 
  // If previous instruction has forbidden slot and .set reorder
  // is active and current instruction is CTI.
  // Then emit a NOP after it.
  if (PrevForbiddenSlotAttr && !SafeInForbiddenSlot(MCID)) {
    TOut.emitEmptyDelaySlot(false, IDLoc, STI);
    // When 'FillDelaySlot' is true, the existing logic will add
    // noreorder before instruction and reorder after it. So there
    // need exclude this case avoiding two '.set reorder'.
    // The format of the first case is:
    // .set noreorder
    // bnezc
    // nop
    // .set reorder
    if (AssemblerOptions.back()->isReorder() && !FillDelaySlot) {
      SetReorderAfterNop = true;
      TOut.emitDirectiveSetReorder();
    }
  }
 
  // Save current instruction`s forbidden slot and whether set reorder.
  // This is the judgment condition for whether to add nop.
  // We would add a couple of '.set noreorder' and '.set reorder' to
  // wrap the current instruction and the next instruction.
  CurForbiddenSlotAttr =
      hasForbiddenSlot(MCID) && AssemblerOptions.back()->isReorder();
 
  if (FillDelaySlot || CurForbiddenSlotAttr)
    TOut.emitDirectiveSetNoReorder();
 
  MacroExpanderResultTy ExpandResult =
      tryExpandInstruction(Inst, IDLoc, Out, STI);
  switch (ExpandResult) {
  case MER_NotAMacro:
    Out.emitInstruction(Inst, *STI);
    break;
  case MER_Success:
    break;
  case MER_Fail:
    return true;
  }
 
  // When current instruction was not CTI, recover reorder state.
  // The format of the second case is:
  // .set noreoder
  // bnezc
  // add
  // .set reorder
  if (PrevForbiddenSlotAttr && !SetReorderAfterNop && !FillDelaySlot &&
      AssemblerOptions.back()->isReorder()) {
    TOut.emitDirectiveSetReorder();
  }
 
  // We know we emitted an instruction on the MER_NotAMacro or MER_Success path.
  // If we're in microMIPS mode then we must also set EF_MIPS_MICROMIPS.
  if (inMicroMipsMode()) {
    TOut.setUsesMicroMips();
    TOut.updateABIInfo(*this);
  }
 
  // If this instruction has a delay slot and .set reorder is active,
  // emit a NOP after it.
  // The format of the third case is:
  // .set noreorder
  // bnezc
  // nop
  // .set noreorder
  // j
  // nop
  // .set reorder
  if (FillDelaySlot) {
    TOut.emitEmptyDelaySlot(hasShortDelaySlot(Inst), IDLoc, STI);
    TOut.emitDirectiveSetReorder();
  }
 
  if ((Opcode == Mips::JalOneReg || Opcode == Mips::JalTwoReg ||
       ExpandedJalSym) &&
      isPicAndNotNxxAbi()) {
    if (IsCpRestoreSet) {
      // We need a NOP between the JALR and the LW:
      // If .set reorder has been used, we've already emitted a NOP.
      // If .set noreorder has been used, we need to emit a NOP at this point.
      if (!AssemblerOptions.back()->isReorder())
        TOut.emitEmptyDelaySlot(hasShortDelaySlot(Inst), IDLoc,
                                STI);
 
      // Load the $gp from the stack.
      TOut.emitGPRestore(CpRestoreOffset, IDLoc, STI);
    } else
      Warning(IDLoc, "no .cprestore used in PIC mode");
  }
 
  return false;
}
 
void MipsAsmParser::onEndOfFile() {
  MipsTargetStreamer &TOut = getTargetStreamer();
  SMLoc IDLoc = SMLoc();
  // If has pending forbidden slot, fill nop and recover reorder.
  if (CurForbiddenSlotAttr) {
    TOut.emitEmptyDelaySlot(false, IDLoc, STI);
    if (AssemblerOptions.back()->isReorder())
      TOut.emitDirectiveSetReorder();
  }
}
 
MipsAsmParser::MacroExpanderResultTy
MipsAsmParser::tryExpandInstruction(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                    const MCSubtargetInfo *STI) {
  switch (Inst.getOpcode()) {
  default:
    return MER_NotAMacro;
  case Mips::LoadImm32:
    return expandLoadImm(Inst, true, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::LoadImm64:
    return expandLoadImm(Inst, false, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::LoadAddrImm32:
  case Mips::LoadAddrImm64:
    assert(Inst.getOperand(0).isReg() && "expected register operand kind");
    assert((Inst.getOperand(1).isImm() || Inst.getOperand(1).isExpr()) &&
           "expected immediate operand kind");
 
    return expandLoadAddress(Inst.getOperand(0).getReg(), Mips::NoRegister,
                             Inst.getOperand(1),
                             Inst.getOpcode() == Mips::LoadAddrImm32, IDLoc,
                             Out, STI)
               ? MER_Fail
               : MER_Success;
  case Mips::LoadAddrReg32:
  case Mips::LoadAddrReg64:
    assert(Inst.getOperand(0).isReg() && "expected register operand kind");
    assert(Inst.getOperand(1).isReg() && "expected register operand kind");
    assert((Inst.getOperand(2).isImm() || Inst.getOperand(2).isExpr()) &&
           "expected immediate operand kind");
 
    return expandLoadAddress(Inst.getOperand(0).getReg(),
                             Inst.getOperand(1).getReg(), Inst.getOperand(2),
                             Inst.getOpcode() == Mips::LoadAddrReg32, IDLoc,
                             Out, STI)
               ? MER_Fail
               : MER_Success;
  case Mips::B_MM_Pseudo:
  case Mips::B_MMR6_Pseudo:
    return expandUncondBranchMMPseudo(Inst, IDLoc, Out, STI) ? MER_Fail
                                                             : MER_Success;
  case Mips::SWM_MM:
  case Mips::LWM_MM:
    return expandLoadStoreMultiple(Inst, IDLoc, Out, STI) ? MER_Fail
                                                          : MER_Success;
  case Mips::JalOneReg:
  case Mips::JalTwoReg:
    return expandJalWithRegs(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::BneImm:
  case Mips::BeqImm:
  case Mips::BEQLImmMacro:
  case Mips::BNELImmMacro:
    return expandBranchImm(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::BLT:
  case Mips::BLE:
  case Mips::BGE:
  case Mips::BGT:
  case Mips::BLTU:
  case Mips::BLEU:
  case Mips::BGEU:
  case Mips::BGTU:
  case Mips::BLTL:
  case Mips::BLEL:
  case Mips::BGEL:
  case Mips::BGTL:
  case Mips::BLTUL:
  case Mips::BLEUL:
  case Mips::BGEUL:
  case Mips::BGTUL:
  case Mips::BLTImmMacro:
  case Mips::BLEImmMacro:
  case Mips::BGEImmMacro:
  case Mips::BGTImmMacro:
  case Mips::BLTUImmMacro:
  case Mips::BLEUImmMacro:
  case Mips::BGEUImmMacro:
  case Mips::BGTUImmMacro:
  case Mips::BLTLImmMacro:
  case Mips::BLELImmMacro:
  case Mips::BGELImmMacro:
  case Mips::BGTLImmMacro:
  case Mips::BLTULImmMacro:
  case Mips::BLEULImmMacro:
  case Mips::BGEULImmMacro:
  case Mips::BGTULImmMacro:
    return expandCondBranches(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::SDivMacro:
  case Mips::SDivIMacro:
  case Mips::SRemMacro:
  case Mips::SRemIMacro:
    return expandDivRem(Inst, IDLoc, Out, STI, false, true) ? MER_Fail
                                                            : MER_Success;
  case Mips::DSDivMacro:
  case Mips::DSDivIMacro:
  case Mips::DSRemMacro:
  case Mips::DSRemIMacro:
    return expandDivRem(Inst, IDLoc, Out, STI, true, true) ? MER_Fail
                                                           : MER_Success;
  case Mips::UDivMacro:
  case Mips::UDivIMacro:
  case Mips::URemMacro:
  case Mips::URemIMacro:
    return expandDivRem(Inst, IDLoc, Out, STI, false, false) ? MER_Fail
                                                             : MER_Success;
  case Mips::DUDivMacro:
  case Mips::DUDivIMacro:
  case Mips::DURemMacro:
  case Mips::DURemIMacro:
    return expandDivRem(Inst, IDLoc, Out, STI, true, false) ? MER_Fail
                                                            : MER_Success;
  case Mips::PseudoTRUNC_W_S:
    return expandTrunc(Inst, false, false, IDLoc, Out, STI) ? MER_Fail
                                                            : MER_Success;
  case Mips::PseudoTRUNC_W_D32:
    return expandTrunc(Inst, true, false, IDLoc, Out, STI) ? MER_Fail
                                                           : MER_Success;
  case Mips::PseudoTRUNC_W_D:
    return expandTrunc(Inst, true, true, IDLoc, Out, STI) ? MER_Fail
                                                          : MER_Success;
 
  case Mips::LoadImmSingleGPR:
    return expandLoadSingleImmToGPR(Inst, IDLoc, Out, STI) ? MER_Fail
                                                           : MER_Success;
  case Mips::LoadImmSingleFGR:
    return expandLoadSingleImmToFPR(Inst, IDLoc, Out, STI) ? MER_Fail
                                                           : MER_Success;
  case Mips::LoadImmDoubleGPR:
    return expandLoadDoubleImmToGPR(Inst, IDLoc, Out, STI) ? MER_Fail
                                                           : MER_Success;
  case Mips::LoadImmDoubleFGR:
    return expandLoadDoubleImmToFPR(Inst, true, IDLoc, Out, STI) ? MER_Fail
                                                                 : MER_Success;
  case Mips::LoadImmDoubleFGR_32:
    return expandLoadDoubleImmToFPR(Inst, false, IDLoc, Out, STI) ? MER_Fail
                                                                  : MER_Success;
 
  case Mips::Ulh:
    return expandUlh(Inst, true, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::Ulhu:
    return expandUlh(Inst, false, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::Ush:
    return expandUsh(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::Ulw:
  case Mips::Usw:
    return expandUxw(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::NORImm:
  case Mips::NORImm64:
    return expandAliasImmediate(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::SGE:
  case Mips::SGEU:
    return expandSge(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::SGEImm:
  case Mips::SGEUImm:
  case Mips::SGEImm64:
  case Mips::SGEUImm64:
    return expandSgeImm(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::SGTImm:
  case Mips::SGTUImm:
  case Mips::SGTImm64:
  case Mips::SGTUImm64:
    return expandSgtImm(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::SLE:
  case Mips::SLEU:
    return expandSle(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::SLEImm:
  case Mips::SLEUImm:
  case Mips::SLEImm64:
  case Mips::SLEUImm64:
    return expandSleImm(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::SLTImm64:
    if (isInt<16>(Inst.getOperand(2).getImm())) {
      Inst.setOpcode(Mips::SLTi64);
      return MER_NotAMacro;
    }
    return expandAliasImmediate(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::SLTUImm64:
    if (isInt<16>(Inst.getOperand(2).getImm())) {
      Inst.setOpcode(Mips::SLTiu64);
      return MER_NotAMacro;
    }
    return expandAliasImmediate(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::ADDi:   case Mips::ADDi_MM:
  case Mips::ADDiu:  case Mips::ADDiu_MM:
  case Mips::SLTi:   case Mips::SLTi_MM:
  case Mips::SLTiu:  case Mips::SLTiu_MM:
    if ((Inst.getNumOperands() == 3) && Inst.getOperand(0).isReg() &&
        Inst.getOperand(1).isReg() && Inst.getOperand(2).isImm()) {
      int64_t ImmValue = Inst.getOperand(2).getImm();
      if (isInt<16>(ImmValue))
        return MER_NotAMacro;
      return expandAliasImmediate(Inst, IDLoc, Out, STI) ? MER_Fail
                                                         : MER_Success;
    }
    return MER_NotAMacro;
  case Mips::ANDi:  case Mips::ANDi_MM:  case Mips::ANDi64:
  case Mips::ORi:   case Mips::ORi_MM:   case Mips::ORi64:
  case Mips::XORi:  case Mips::XORi_MM:  case Mips::XORi64:
    if ((Inst.getNumOperands() == 3) && Inst.getOperand(0).isReg() &&
        Inst.getOperand(1).isReg() && Inst.getOperand(2).isImm()) {
      int64_t ImmValue = Inst.getOperand(2).getImm();
      if (isUInt<16>(ImmValue))
        return MER_NotAMacro;
      return expandAliasImmediate(Inst, IDLoc, Out, STI) ? MER_Fail
                                                         : MER_Success;
    }
    return MER_NotAMacro;
  case Mips::ROL:
  case Mips::ROR:
    return expandRotation(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::ROLImm:
  case Mips::RORImm:
    return expandRotationImm(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::DROL:
  case Mips::DROR:
    return expandDRotation(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::DROLImm:
  case Mips::DRORImm:
    return expandDRotationImm(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::ABSMacro:
    return expandAbs(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::MULImmMacro:
  case Mips::DMULImmMacro:
    return expandMulImm(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::MULOMacro:
  case Mips::DMULOMacro:
    return expandMulO(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::MULOUMacro:
  case Mips::DMULOUMacro:
    return expandMulOU(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::DMULMacro:
    return expandDMULMacro(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::LDMacro:
  case Mips::SDMacro:
    return expandLoadStoreDMacro(Inst, IDLoc, Out, STI,
                                 Inst.getOpcode() == Mips::LDMacro)
               ? MER_Fail
               : MER_Success;
  case Mips::SDC1_M1:
    return expandStoreDM1Macro(Inst, IDLoc, Out, STI)
               ? MER_Fail
               : MER_Success;
  case Mips::SEQMacro:
    return expandSeq(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::SEQIMacro:
    return expandSeqI(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::SNEMacro:
    return expandSne(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::SNEIMacro:
    return expandSneI(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::MFTC0:   case Mips::MTTC0:
  case Mips::MFTGPR:  case Mips::MTTGPR:
  case Mips::MFTLO:   case Mips::MTTLO:
  case Mips::MFTHI:   case Mips::MTTHI:
  case Mips::MFTACX:  case Mips::MTTACX:
  case Mips::MFTDSP:  case Mips::MTTDSP:
  case Mips::MFTC1:   case Mips::MTTC1:
  case Mips::MFTHC1:  case Mips::MTTHC1:
  case Mips::CFTC1:   case Mips::CTTC1:
    return expandMXTRAlias(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  case Mips::SaaAddr:
  case Mips::SaadAddr:
    return expandSaaAddr(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
  }
}
 
bool MipsAsmParser::expandJalWithRegs(MCInst &Inst, SMLoc IDLoc,
                                      MCStreamer &Out,
                                      const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
 
  // Create a JALR instruction which is going to replace the pseudo-JAL.
  MCInst JalrInst;
  JalrInst.setLoc(IDLoc);
  const MCOperand FirstRegOp = Inst.getOperand(0);
  const unsigned Opcode = Inst.getOpcode();
 
  if (Opcode == Mips::JalOneReg) {
    // jal $rs => jalr $rs
    if (IsCpRestoreSet && inMicroMipsMode()) {
      JalrInst.setOpcode(Mips::JALRS16_MM);
      JalrInst.addOperand(FirstRegOp);
    } else if (inMicroMipsMode()) {
      JalrInst.setOpcode(hasMips32r6() ? Mips::JALRC16_MMR6 : Mips::JALR16_MM);
      JalrInst.addOperand(FirstRegOp);
    } else {
      JalrInst.setOpcode(Mips::JALR);
      JalrInst.addOperand(MCOperand::createReg(Mips::RA));
      JalrInst.addOperand(FirstRegOp);
    }
  } else if (Opcode == Mips::JalTwoReg) {
    // jal $rd, $rs => jalr $rd, $rs
    if (IsCpRestoreSet && inMicroMipsMode())
      JalrInst.setOpcode(Mips::JALRS_MM);
    else
      JalrInst.setOpcode(inMicroMipsMode() ? Mips::JALR_MM : Mips::JALR);
    JalrInst.addOperand(FirstRegOp);
    const MCOperand SecondRegOp = Inst.getOperand(1);
    JalrInst.addOperand(SecondRegOp);
  }
  Out.emitInstruction(JalrInst, *STI);
 
  // If .set reorder is active and branch instruction has a delay slot,
  // emit a NOP after it.
  const MCInstrDesc &MCID = MII.get(JalrInst.getOpcode());
  if (MCID.hasDelaySlot() && AssemblerOptions.back()->isReorder())
    TOut.emitEmptyDelaySlot(hasShortDelaySlot(JalrInst), IDLoc,
                            STI);
 
  return false;
}
 
/// Can the value be represented by a unsigned N-bit value and a shift left?
template <unsigned N> static bool isShiftedUIntAtAnyPosition(uint64_t x) {
  return x && isUInt<N>(x >> llvm::countr_zero(x));
}
 
/// Load (or add) an immediate into a register.
///
/// @param ImmValue     The immediate to load.
/// @param DstReg       The register that will hold the immediate.
/// @param SrcReg       A register to add to the immediate or Mips::NoRegister
///                     for a simple initialization.
/// @param Is32BitImm   Is ImmValue 32-bit or 64-bit?
/// @param IsAddress    True if the immediate represents an address. False if it
///                     is an integer.
/// @param IDLoc        Location of the immediate in the source file.
bool MipsAsmParser::loadImmediate(int64_t ImmValue, unsigned DstReg,
                                  unsigned SrcReg, bool Is32BitImm,
                                  bool IsAddress, SMLoc IDLoc, MCStreamer &Out,
                                  const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
 
  if (!Is32BitImm && !isGP64bit()) {
    Error(IDLoc, "instruction requires a 64-bit architecture");
    return true;
  }
 
  if (Is32BitImm) {
    if (isInt<32>(ImmValue) || isUInt<32>(ImmValue)) {
      // Sign extend up to 64-bit so that the predicates match the hardware
      // behaviour. In particular, isInt<16>(0xffff8000) and similar should be
      // true.
      ImmValue = SignExtend64<32>(ImmValue);
    } else {
      Error(IDLoc, "instruction requires a 32-bit immediate");
      return true;
    }
  }
 
  unsigned ZeroReg = IsAddress ? ABI.GetNullPtr() : ABI.GetZeroReg();
  unsigned AdduOp = !Is32BitImm ? Mips::DADDu : Mips::ADDu;
 
  bool UseSrcReg = false;
  if (SrcReg != Mips::NoRegister)
    UseSrcReg = true;
 
  unsigned TmpReg = DstReg;
  if (UseSrcReg &&
      getContext().getRegisterInfo()->isSuperOrSubRegisterEq(DstReg, SrcReg)) {
    // At this point we need AT to perform the expansions and we exit if it is
    // not available.
    unsigned ATReg = getATReg(IDLoc);
    if (!ATReg)
      return true;
    TmpReg = ATReg;
  }
 
  if (isInt<16>(ImmValue)) {
    if (!UseSrcReg)
      SrcReg = ZeroReg;
 
    // This doesn't quite follow the usual ABI expectations for N32 but matches
    // traditional assembler behaviour. N32 would normally use addiu for both
    // integers and addresses.
    if (IsAddress && !Is32BitImm) {
      TOut.emitRRI(Mips::DADDiu, DstReg, SrcReg, ImmValue, IDLoc, STI);
      return false;
    }
 
    TOut.emitRRI(Mips::ADDiu, DstReg, SrcReg, ImmValue, IDLoc, STI);
    return false;
  }
 
  if (isUInt<16>(ImmValue)) {
    unsigned TmpReg = DstReg;
    if (SrcReg == DstReg) {
      TmpReg = getATReg(IDLoc);
      if (!TmpReg)
        return true;
    }
 
    TOut.emitRRI(Mips::ORi, TmpReg, ZeroReg, ImmValue, IDLoc, STI);
    if (UseSrcReg)
      TOut.emitRRR(ABI.GetPtrAdduOp(), DstReg, TmpReg, SrcReg, IDLoc, STI);
    return false;
  }
 
  if (isInt<32>(ImmValue) || isUInt<32>(ImmValue)) {
    warnIfNoMacro(IDLoc);
 
    uint16_t Bits31To16 = (ImmValue >> 16) & 0xffff;
    uint16_t Bits15To0 = ImmValue & 0xffff;
    if (!Is32BitImm && !isInt<32>(ImmValue)) {
      // Traditional behaviour seems to special case this particular value. It's
      // not clear why other masks are handled differently.
      if (ImmValue == 0xffffffff) {
        TOut.emitRI(Mips::LUi, TmpReg, 0xffff, IDLoc, STI);
        TOut.emitRRI(Mips::DSRL32, TmpReg, TmpReg, 0, IDLoc, STI);
        if (UseSrcReg)
          TOut.emitRRR(AdduOp, DstReg, TmpReg, SrcReg, IDLoc, STI);
        return false;
      }
 
      // Expand to an ORi instead of a LUi to avoid sign-extending into the
      // upper 32 bits.
      TOut.emitRRI(Mips::ORi, TmpReg, ZeroReg, Bits31To16, IDLoc, STI);
      TOut.emitRRI(Mips::DSLL, TmpReg, TmpReg, 16, IDLoc, STI);
      if (Bits15To0)
        TOut.emitRRI(Mips::ORi, TmpReg, TmpReg, Bits15To0, IDLoc, STI);
      if (UseSrcReg)
        TOut.emitRRR(AdduOp, DstReg, TmpReg, SrcReg, IDLoc, STI);
      return false;
    }
 
    TOut.emitRI(Mips::LUi, TmpReg, Bits31To16, IDLoc, STI);
    if (Bits15To0)
      TOut.emitRRI(Mips::ORi, TmpReg, TmpReg, Bits15To0, IDLoc, STI);
    if (UseSrcReg)
      TOut.emitRRR(AdduOp, DstReg, TmpReg, SrcReg, IDLoc, STI);
    return false;
  }
 
  if (isShiftedUIntAtAnyPosition<16>(ImmValue)) {
    if (Is32BitImm) {
      Error(IDLoc, "instruction requires a 32-bit immediate");
      return true;
    }
 
    // We've processed ImmValue satisfying isUInt<16> above, so ImmValue must be
    // at least 17-bit wide here.
    unsigned BitWidth = llvm::bit_width((uint64_t)ImmValue);
    assert(BitWidth >= 17 && "ImmValue must be at least 17-bit wide");
 
    // Traditionally, these immediates are shifted as little as possible and as
    // such we align the most significant bit to bit 15 of our temporary.
    unsigned ShiftAmount = BitWidth - 16;
    uint16_t Bits = (ImmValue >> ShiftAmount) & 0xffff;
    TOut.emitRRI(Mips::ORi, TmpReg, ZeroReg, Bits, IDLoc, STI);
    TOut.emitRRI(Mips::DSLL, TmpReg, TmpReg, ShiftAmount, IDLoc, STI);
 
    if (UseSrcReg)
      TOut.emitRRR(AdduOp, DstReg, TmpReg, SrcReg, IDLoc, STI);
 
    return false;
  }
 
  warnIfNoMacro(IDLoc);
 
  // The remaining case is packed with a sequence of dsll and ori with zeros
  // being omitted and any neighbouring dsll's being coalesced.
  // The highest 32-bit's are equivalent to a 32-bit immediate load.
 
  // Load bits 32-63 of ImmValue into bits 0-31 of the temporary register.
  if (loadImmediate(ImmValue >> 32, TmpReg, Mips::NoRegister, true, false,
                    IDLoc, Out, STI))
    return false;
 
  // Shift and accumulate into the register. If a 16-bit chunk is zero, then
  // skip it and defer the shift to the next chunk.
  unsigned ShiftCarriedForwards = 16;
  for (int BitNum = 16; BitNum >= 0; BitNum -= 16) {
    uint16_t ImmChunk = (ImmValue >> BitNum) & 0xffff;
 
    if (ImmChunk != 0) {
      TOut.emitDSLL(TmpReg, TmpReg, ShiftCarriedForwards, IDLoc, STI);
      TOut.emitRRI(Mips::ORi, TmpReg, TmpReg, ImmChunk, IDLoc, STI);
      ShiftCarriedForwards = 0;
    }
 
    ShiftCarriedForwards += 16;
  }
  ShiftCarriedForwards -= 16;
 
  // Finish any remaining shifts left by trailing zeros.
  if (ShiftCarriedForwards)
    TOut.emitDSLL(TmpReg, TmpReg, ShiftCarriedForwards, IDLoc, STI);
 
  if (UseSrcReg)
    TOut.emitRRR(AdduOp, DstReg, TmpReg, SrcReg, IDLoc, STI);
 
  return false;
}
 
bool MipsAsmParser::expandLoadImm(MCInst &Inst, bool Is32BitImm, SMLoc IDLoc,
                                  MCStreamer &Out, const MCSubtargetInfo *STI) {
  const MCOperand &ImmOp = Inst.getOperand(1);
  assert(ImmOp.isImm() && "expected immediate operand kind");
  const MCOperand &DstRegOp = Inst.getOperand(0);
  assert(DstRegOp.isReg() && "expected register operand kind");
 
  if (loadImmediate(ImmOp.getImm(), DstRegOp.getReg(), Mips::NoRegister,
                    Is32BitImm, false, IDLoc, Out, STI))
    return true;
 
  return false;
}
 
bool MipsAsmParser::expandLoadAddress(unsigned DstReg, unsigned BaseReg,
                                      const MCOperand &Offset,
                                      bool Is32BitAddress, SMLoc IDLoc,
                                      MCStreamer &Out,
                                      const MCSubtargetInfo *STI) {
  // la can't produce a usable address when addresses are 64-bit.
  if (Is32BitAddress && ABI.ArePtrs64bit()) {
    Warning(IDLoc, "la used to load 64-bit address");
    // Continue as if we had 'dla' instead.
    Is32BitAddress = false;
  }
 
  // dla requires 64-bit addresses.
  if (!Is32BitAddress && !hasMips3()) {
    Error(IDLoc, "instruction requires a 64-bit architecture");
    return true;
  }
 
  if (!Offset.isImm())
    return loadAndAddSymbolAddress(Offset.getExpr(), DstReg, BaseReg,
                                   Is32BitAddress, IDLoc, Out, STI);
 
  if (!ABI.ArePtrs64bit()) {
    // Continue as if we had 'la' whether we had 'la' or 'dla'.
    Is32BitAddress = true;
  }
 
  return loadImmediate(Offset.getImm(), DstReg, BaseReg, Is32BitAddress, true,
                       IDLoc, Out, STI);
}
 
bool MipsAsmParser::loadAndAddSymbolAddress(const MCExpr *SymExpr,
                                            unsigned DstReg, unsigned SrcReg,
                                            bool Is32BitSym, SMLoc IDLoc,
                                            MCStreamer &Out,
                                            const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
  bool UseSrcReg = SrcReg != Mips::NoRegister && SrcReg != Mips::ZERO &&
                   SrcReg != Mips::ZERO_64;
  warnIfNoMacro(IDLoc);
 
  if (inPicMode()) {
    MCValue Res;
    if (!SymExpr->evaluateAsRelocatable(Res, nullptr, nullptr)) {
      Error(IDLoc, "expected relocatable expression");
      return true;
    }
    if (Res.getSymB() != nullptr) {
      Error(IDLoc, "expected relocatable expression with only one symbol");
      return true;
    }
 
    bool IsPtr64 = ABI.ArePtrs64bit();
    bool IsLocalSym =
        Res.getSymA()->getSymbol().isInSection() ||
        Res.getSymA()->getSymbol().isTemporary() ||
        (Res.getSymA()->getSymbol().isELF() &&
         cast<MCSymbolELF>(Res.getSymA()->getSymbol()).getBinding() ==
             ELF::STB_LOCAL);
    // For O32, "$"-prefixed symbols are recognized as temporary while
    // .L-prefixed symbols are not (PrivateGlobalPrefix is "$"). Recognize ".L"
    // manually.
    if (ABI.IsO32() && Res.getSymA()->getSymbol().getName().starts_with(".L"))
      IsLocalSym = true;
    bool UseXGOT = STI->hasFeature(Mips::FeatureXGOT) && !IsLocalSym;
 
    // The case where the result register is $25 is somewhat special. If the
    // symbol in the final relocation is external and not modified with a
    // constant then we must use R_MIPS_CALL16 instead of R_MIPS_GOT16
    // or R_MIPS_CALL16 instead of R_MIPS_GOT_DISP in 64-bit case.
    if ((DstReg == Mips::T9 || DstReg == Mips::T9_64) && !UseSrcReg &&
        Res.getConstant() == 0 && !IsLocalSym) {
      if (UseXGOT) {
        const MCExpr *CallHiExpr = MipsMCExpr::create(MipsMCExpr::MEK_CALL_HI16,
                                                      SymExpr, getContext());
        const MCExpr *CallLoExpr = MipsMCExpr::create(MipsMCExpr::MEK_CALL_LO16,
                                                      SymExpr, getContext());
        TOut.emitRX(Mips::LUi, DstReg, MCOperand::createExpr(CallHiExpr), IDLoc,
                    STI);
        TOut.emitRRR(IsPtr64 ? Mips::DADDu : Mips::ADDu, DstReg, DstReg, GPReg,
                     IDLoc, STI);
        TOut.emitRRX(IsPtr64 ? Mips::LD : Mips::LW, DstReg, DstReg,
                     MCOperand::createExpr(CallLoExpr), IDLoc, STI);
      } else {
        const MCExpr *CallExpr =
            MipsMCExpr::create(MipsMCExpr::MEK_GOT_CALL, SymExpr, getContext());
        TOut.emitRRX(IsPtr64 ? Mips::LD : Mips::LW, DstReg, GPReg,
                     MCOperand::createExpr(CallExpr), IDLoc, STI);
      }
      return false;
    }
 
    unsigned TmpReg = DstReg;
    if (UseSrcReg &&
        getContext().getRegisterInfo()->isSuperOrSubRegisterEq(DstReg,
                                                               SrcReg)) {
      // If $rs is the same as $rd, we need to use AT.
      // If it is not available we exit.
      unsigned ATReg = getATReg(IDLoc);
      if (!ATReg)
        return true;
      TmpReg = ATReg;
    }
 
    // FIXME: In case of N32 / N64 ABI and emabled XGOT, local addresses
    // loaded using R_MIPS_GOT_PAGE / R_MIPS_GOT_OFST pair of relocations.
    // FIXME: Implement XGOT for microMIPS.
    if (UseXGOT) {
      // Loading address from XGOT
      //   External GOT: lui $tmp, %got_hi(symbol)($gp)
      //                 addu $tmp, $tmp, $gp
      //                 lw $tmp, %got_lo(symbol)($tmp)
      //                >addiu $tmp, $tmp, offset
      //                >addiu $rd, $tmp, $rs
      // The addiu's marked with a '>' may be omitted if they are redundant. If
      // this happens then the last instruction must use $rd as the result
      // register.
      const MCExpr *CallHiExpr =
          MipsMCExpr::create(MipsMCExpr::MEK_GOT_HI16, SymExpr, getContext());
      const MCExpr *CallLoExpr = MipsMCExpr::create(
          MipsMCExpr::MEK_GOT_LO16, Res.getSymA(), getContext());
 
      TOut.emitRX(Mips::LUi, TmpReg, MCOperand::createExpr(CallHiExpr), IDLoc,
                  STI);
      TOut.emitRRR(IsPtr64 ? Mips::DADDu : Mips::ADDu, TmpReg, TmpReg, GPReg,
                   IDLoc, STI);
      TOut.emitRRX(IsPtr64 ? Mips::LD : Mips::LW, TmpReg, TmpReg,
                   MCOperand::createExpr(CallLoExpr), IDLoc, STI);
 
      if (Res.getConstant() != 0)
        TOut.emitRRX(IsPtr64 ? Mips::DADDiu : Mips::ADDiu, TmpReg, TmpReg,
                     MCOperand::createExpr(MCConstantExpr::create(
                         Res.getConstant(), getContext())),
                     IDLoc, STI);
 
      if (UseSrcReg)
        TOut.emitRRR(IsPtr64 ? Mips::DADDu : Mips::ADDu, DstReg, TmpReg, SrcReg,
                     IDLoc, STI);
      return false;
    }
 
    const MipsMCExpr *GotExpr = nullptr;
    const MCExpr *LoExpr = nullptr;
    if (ABI.IsN32() || ABI.IsN64()) {
      // The remaining cases are:
      //   Small offset: ld $tmp, %got_disp(symbol)($gp)
      //                >daddiu $tmp, $tmp, offset
      //                >daddu $rd, $tmp, $rs
      // The daddiu's marked with a '>' may be omitted if they are redundant. If
      // this happens then the last instruction must use $rd as the result
      // register.
      GotExpr = MipsMCExpr::create(MipsMCExpr::MEK_GOT_DISP, Res.getSymA(),
                                   getContext());
      if (Res.getConstant() != 0) {
        // Symbols fully resolve with just the %got_disp(symbol) but we
        // must still account for any offset to the symbol for
        // expressions like symbol+8.
        LoExpr = MCConstantExpr::create(Res.getConstant(), getContext());
 
        // FIXME: Offsets greater than 16 bits are not yet implemented.
        // FIXME: The correct range is a 32-bit sign-extended number.
        if (Res.getConstant() < -0x8000 || Res.getConstant() > 0x7fff) {
          Error(IDLoc, "macro instruction uses large offset, which is not "
                       "currently supported");
          return true;
        }
      }
    } else {
      // The remaining cases are:
      //   External GOT: lw $tmp, %got(symbol)($gp)
      //                >addiu $tmp, $tmp, offset
      //                >addiu $rd, $tmp, $rs
      //   Local GOT:    lw $tmp, %got(symbol+offset)($gp)
      //                 addiu $tmp, $tmp, %lo(symbol+offset)($gp)
      //                >addiu $rd, $tmp, $rs
      // The addiu's marked with a '>' may be omitted if they are redundant. If
      // this happens then the last instruction must use $rd as the result
      // register.
      if (IsLocalSym) {
        GotExpr =
            MipsMCExpr::create(MipsMCExpr::MEK_GOT, SymExpr, getContext());
        LoExpr = MipsMCExpr::create(MipsMCExpr::MEK_LO, SymExpr, getContext());
      } else {
        // External symbols fully resolve the symbol with just the %got(symbol)
        // but we must still account for any offset to the symbol for
        // expressions like symbol+8.
        GotExpr = MipsMCExpr::create(MipsMCExpr::MEK_GOT, Res.getSymA(),
                                     getContext());
        if (Res.getConstant() != 0)
          LoExpr = MCConstantExpr::create(Res.getConstant(), getContext());
      }
    }
 
    TOut.emitRRX(IsPtr64 ? Mips::LD : Mips::LW, TmpReg, GPReg,
                 MCOperand::createExpr(GotExpr), IDLoc, STI);
 
    if (LoExpr)
      TOut.emitRRX(IsPtr64 ? Mips::DADDiu : Mips::ADDiu, TmpReg, TmpReg,
                   MCOperand::createExpr(LoExpr), IDLoc, STI);
 
    if (UseSrcReg)
      TOut.emitRRR(IsPtr64 ? Mips::DADDu : Mips::ADDu, DstReg, TmpReg, SrcReg,
                   IDLoc, STI);
 
    return false;
  }
 
  const MipsMCExpr *HiExpr =
      MipsMCExpr::create(MipsMCExpr::MEK_HI, SymExpr, getContext());
  const MipsMCExpr *LoExpr =
      MipsMCExpr::create(MipsMCExpr::MEK_LO, SymExpr, getContext());
 
  // This is the 64-bit symbol address expansion.
  if (ABI.ArePtrs64bit() && isGP64bit()) {
    // We need AT for the 64-bit expansion in the cases where the optional
    // source register is the destination register and for the superscalar
    // scheduled form.
    //
    // If it is not available we exit if the destination is the same as the
    // source register.
 
    const MipsMCExpr *HighestExpr =
        MipsMCExpr::create(MipsMCExpr::MEK_HIGHEST, SymExpr, getContext());
    const MipsMCExpr *HigherExpr =
        MipsMCExpr::create(MipsMCExpr::MEK_HIGHER, SymExpr, getContext());
 
    bool RdRegIsRsReg =
        UseSrcReg &&
        getContext().getRegisterInfo()->isSuperOrSubRegisterEq(DstReg, SrcReg);
 
    if (canUseATReg() && UseSrcReg && RdRegIsRsReg) {
      unsigned ATReg = getATReg(IDLoc);
 
      // If $rs is the same as $rd:
      // (d)la $rd, sym($rd) => lui    $at, %highest(sym)
      //                        daddiu $at, $at, %higher(sym)
      //                        dsll   $at, $at, 16
      //                        daddiu $at, $at, %hi(sym)
      //                        dsll   $at, $at, 16
      //                        daddiu $at, $at, %lo(sym)
      //                        daddu  $rd, $at, $rd
      TOut.emitRX(Mips::LUi, ATReg, MCOperand::createExpr(HighestExpr), IDLoc,
                  STI);
      TOut.emitRRX(Mips::DADDiu, ATReg, ATReg,
                   MCOperand::createExpr(HigherExpr), IDLoc, STI);
      TOut.emitRRI(Mips::DSLL, ATReg, ATReg, 16, IDLoc, STI);
      TOut.emitRRX(Mips::DADDiu, ATReg, ATReg, MCOperand::createExpr(HiExpr),
                   IDLoc, STI);
      TOut.emitRRI(Mips::DSLL, ATReg, ATReg, 16, IDLoc, STI);
      TOut.emitRRX(Mips::DADDiu, ATReg, ATReg, MCOperand::createExpr(LoExpr),
                   IDLoc, STI);
      TOut.emitRRR(Mips::DADDu, DstReg, ATReg, SrcReg, IDLoc, STI);
 
      return false;
    } else if (canUseATReg() && !RdRegIsRsReg && DstReg != getATReg(IDLoc)) {
      unsigned ATReg = getATReg(IDLoc);
 
      // If the $rs is different from $rd or if $rs isn't specified and we
      // have $at available:
      // (d)la $rd, sym/sym($rs) => lui    $rd, %highest(sym)
      //                            lui    $at, %hi(sym)
      //                            daddiu $rd, $rd, %higher(sym)
      //                            daddiu $at, $at, %lo(sym)
      //                            dsll32 $rd, $rd, 0
      //                            daddu  $rd, $rd, $at
      //                            (daddu  $rd, $rd, $rs)
      //
      // Which is preferred for superscalar issue.
      TOut.emitRX(Mips::LUi, DstReg, MCOperand::createExpr(HighestExpr), IDLoc,
                  STI);
      TOut.emitRX(Mips::LUi, ATReg, MCOperand::createExpr(HiExpr), IDLoc, STI);
      TOut.emitRRX(Mips::DADDiu, DstReg, DstReg,
                   MCOperand::createExpr(HigherExpr), IDLoc, STI);
      TOut.emitRRX(Mips::DADDiu, ATReg, ATReg, MCOperand::createExpr(LoExpr),
                   IDLoc, STI);
      TOut.emitRRI(Mips::DSLL32, DstReg, DstReg, 0, IDLoc, STI);
      TOut.emitRRR(Mips::DADDu, DstReg, DstReg, ATReg, IDLoc, STI);
      if (UseSrcReg)
        TOut.emitRRR(Mips::DADDu, DstReg, DstReg, SrcReg, IDLoc, STI);
 
      return false;
    } else if ((!canUseATReg() && !RdRegIsRsReg) ||
               (canUseATReg() && DstReg == getATReg(IDLoc))) {
      // Otherwise, synthesize the address in the destination register
      // serially:
      // (d)la $rd, sym/sym($rs) => lui    $rd, %highest(sym)
      //                            daddiu $rd, $rd, %higher(sym)
      //                            dsll   $rd, $rd, 16
      //                            daddiu $rd, $rd, %hi(sym)
      //                            dsll   $rd, $rd, 16
      //                            daddiu $rd, $rd, %lo(sym)
      TOut.emitRX(Mips::LUi, DstReg, MCOperand::createExpr(HighestExpr), IDLoc,
                  STI);
      TOut.emitRRX(Mips::DADDiu, DstReg, DstReg,
                   MCOperand::createExpr(HigherExpr), IDLoc, STI);
      TOut.emitRRI(Mips::DSLL, DstReg, DstReg, 16, IDLoc, STI);
      TOut.emitRRX(Mips::DADDiu, DstReg, DstReg,
                   MCOperand::createExpr(HiExpr), IDLoc, STI);
      TOut.emitRRI(Mips::DSLL, DstReg, DstReg, 16, IDLoc, STI);
      TOut.emitRRX(Mips::DADDiu, DstReg, DstReg,
                   MCOperand::createExpr(LoExpr), IDLoc, STI);
      if (UseSrcReg)
        TOut.emitRRR(Mips::DADDu, DstReg, DstReg, SrcReg, IDLoc, STI);
 
      return false;
    } else {
      // We have a case where SrcReg == DstReg and we don't have $at
      // available. We can't expand this case, so error out appropriately.
      assert(SrcReg == DstReg && !canUseATReg() &&
             "Could have expanded dla but didn't?");
      reportParseError(IDLoc,
                     "pseudo-instruction requires $at, which is not available");
      return true;
    }
  }
 
  // And now, the 32-bit symbol address expansion:
  // If $rs is the same as $rd:
  // (d)la $rd, sym($rd)     => lui   $at, %hi(sym)
  //                            ori   $at, $at, %lo(sym)
  //                            addu  $rd, $at, $rd
  // Otherwise, if the $rs is different from $rd or if $rs isn't specified:
  // (d)la $rd, sym/sym($rs) => lui   $rd, %hi(sym)
  //                            ori   $rd, $rd, %lo(sym)
  //                            (addu $rd, $rd, $rs)
  unsigned TmpReg = DstReg;
  if (UseSrcReg &&
      getContext().getRegisterInfo()->isSuperOrSubRegisterEq(DstReg, SrcReg)) {
    // If $rs is the same as $rd, we need to use AT.
    // If it is not available we exit.
    unsigned ATReg = getATReg(IDLoc);
    if (!ATReg)
      return true;
    TmpReg = ATReg;
  }
 
  TOut.emitRX(Mips::LUi, TmpReg, MCOperand::createExpr(HiExpr), IDLoc, STI);
  TOut.emitRRX(Mips::ADDiu, TmpReg, TmpReg, MCOperand::createExpr(LoExpr),
               IDLoc, STI);
 
  if (UseSrcReg)
    TOut.emitRRR(Mips::ADDu, DstReg, TmpReg, SrcReg, IDLoc, STI);
  else
    assert(
        getContext().getRegisterInfo()->isSuperOrSubRegisterEq(DstReg, TmpReg));
 
  return false;
}
 
// Each double-precision register DO-D15 overlaps with two of the single
// precision registers F0-F31. As an example, all of the following hold true:
// D0 + 1 == F1, F1 + 1 == D1, F1 + 1 == F2, depending on the context.
static unsigned nextReg(unsigned Reg) {
  if (MipsMCRegisterClasses[Mips::FGR32RegClassID].contains(Reg))
    return Reg == (unsigned)Mips::F31 ? (unsigned)Mips::F0 : Reg + 1;
  switch (Reg) {
  default: llvm_unreachable("Unknown register in assembly macro expansion!");
  case Mips::ZERO: return Mips::AT;
  case Mips::AT:   return Mips::V0;
  case Mips::V0:   return Mips::V1;
  case Mips::V1:   return Mips::A0;
  case Mips::A0:   return Mips::A1;
  case Mips::A1:   return Mips::A2;
  case Mips::A2:   return Mips::A3;
  case Mips::A3:   return Mips::T0;
  case Mips::T0:   return Mips::T1;
  case Mips::T1:   return Mips::T2;
  case Mips::T2:   return Mips::T3;
  case Mips::T3:   return Mips::T4;
  case Mips::T4:   return Mips::T5;
  case Mips::T5:   return Mips::T6;
  case Mips::T6:   return Mips::T7;
  case Mips::T7:   return Mips::S0;
  case Mips::S0:   return Mips::S1;
  case Mips::S1:   return Mips::S2;
  case Mips::S2:   return Mips::S3;
  case Mips::S3:   return Mips::S4;
  case Mips::S4:   return Mips::S5;
  case Mips::S5:   return Mips::S6;
  case Mips::S6:   return Mips::S7;
  case Mips::S7:   return Mips::T8;
  case Mips::T8:   return Mips::T9;
  case Mips::T9:   return Mips::K0;
  case Mips::K0:   return Mips::K1;
  case Mips::K1:   return Mips::GP;
  case Mips::GP:   return Mips::SP;
  case Mips::SP:   return Mips::FP;
  case Mips::FP:   return Mips::RA;
  case Mips::RA:   return Mips::ZERO;
  case Mips::D0:   return Mips::F1;
  case Mips::D1:   return Mips::F3;
  case Mips::D2:   return Mips::F5;
  case Mips::D3:   return Mips::F7;
  case Mips::D4:   return Mips::F9;
  case Mips::D5:   return Mips::F11;
  case Mips::D6:   return Mips::F13;
  case Mips::D7:   return Mips::F15;
  case Mips::D8:   return Mips::F17;
  case Mips::D9:   return Mips::F19;
  case Mips::D10:   return Mips::F21;
  case Mips::D11:   return Mips::F23;
  case Mips::D12:   return Mips::F25;
  case Mips::D13:   return Mips::F27;
  case Mips::D14:   return Mips::F29;
  case Mips::D15:   return Mips::F31;
  }
}
 
// FIXME: This method is too general. In principle we should compute the number
// of instructions required to synthesize the immediate inline compared to
// synthesizing the address inline and relying on non .text sections.
// For static O32 and N32 this may yield a small benefit, for static N64 this is
// likely to yield a much larger benefit as we have to synthesize a 64bit
// address to load a 64 bit value.
bool MipsAsmParser::emitPartialAddress(MipsTargetStreamer &TOut, SMLoc IDLoc,
                                       MCSymbol *Sym) {
  unsigned ATReg = getATReg(IDLoc);
  if (!ATReg)
    return true;
 
  if(IsPicEnabled) {
    const MCExpr *GotSym =
        MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());
    const MipsMCExpr *GotExpr =
        MipsMCExpr::create(MipsMCExpr::MEK_GOT, GotSym, getContext());
 
    if(isABI_O32() || isABI_N32()) {
      TOut.emitRRX(Mips::LW, ATReg, GPReg, MCOperand::createExpr(GotExpr),
                   IDLoc, STI);
    } else { //isABI_N64()
      TOut.emitRRX(Mips::LD, ATReg, GPReg, MCOperand::createExpr(GotExpr),
                   IDLoc, STI);
    }
  } else { //!IsPicEnabled
    const MCExpr *HiSym =
        MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());
    const MipsMCExpr *HiExpr =
        MipsMCExpr::create(MipsMCExpr::MEK_HI, HiSym, getContext());
 
    // FIXME: This is technically correct but gives a different result to gas,
    // but gas is incomplete there (it has a fixme noting it doesn't work with
    // 64-bit addresses).
    // FIXME: With -msym32 option, the address expansion for N64 should probably
    // use the O32 / N32 case. It's safe to use the 64 address expansion as the
    // symbol's value is considered sign extended.
    if(isABI_O32() || isABI_N32()) {
      TOut.emitRX(Mips::LUi, ATReg, MCOperand::createExpr(HiExpr), IDLoc, STI);
    } else { //isABI_N64()
      const MCExpr *HighestSym =
          MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());
      const MipsMCExpr *HighestExpr =
          MipsMCExpr::create(MipsMCExpr::MEK_HIGHEST, HighestSym, getContext());
      const MCExpr *HigherSym =
          MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());
      const MipsMCExpr *HigherExpr =
          MipsMCExpr::create(MipsMCExpr::MEK_HIGHER, HigherSym, getContext());
 
      TOut.emitRX(Mips::LUi, ATReg, MCOperand::createExpr(HighestExpr), IDLoc,
                  STI);
      TOut.emitRRX(Mips::DADDiu, ATReg, ATReg,
                   MCOperand::createExpr(HigherExpr), IDLoc, STI);
      TOut.emitRRI(Mips::DSLL, ATReg, ATReg, 16, IDLoc, STI);
      TOut.emitRRX(Mips::DADDiu, ATReg, ATReg, MCOperand::createExpr(HiExpr),
                   IDLoc, STI);
      TOut.emitRRI(Mips::DSLL, ATReg, ATReg, 16, IDLoc, STI);
    }
  }
  return false;
}
 
static uint64_t convertIntToDoubleImm(uint64_t ImmOp64) {
  // If ImmOp64 is AsmToken::Integer type (all bits set to zero in the
  // exponent field), convert it to double (e.g. 1 to 1.0)
  if ((Hi_32(ImmOp64) & 0x7ff00000) == 0) {
    APFloat RealVal(APFloat::IEEEdouble(), ImmOp64);
    ImmOp64 = RealVal.bitcastToAPInt().getZExtValue();
  }
  return ImmOp64;
}
 
static uint32_t covertDoubleImmToSingleImm(uint64_t ImmOp64) {
  // Conversion of a double in an uint64_t to a float in a uint32_t,
  // retaining the bit pattern of a float.
  double DoubleImm = llvm::bit_cast<double>(ImmOp64);
  float TmpFloat = static_cast<float>(DoubleImm);
  return llvm::bit_cast<uint32_t>(TmpFloat);
}
 
bool MipsAsmParser::expandLoadSingleImmToGPR(MCInst &Inst, SMLoc IDLoc,
                                             MCStreamer &Out,
                                             const MCSubtargetInfo *STI) {
  assert(Inst.getNumOperands() == 2 && "Invalid operand count");
  assert(Inst.getOperand(0).isReg() && Inst.getOperand(1).isImm() &&
         "Invalid instruction operand.");
 
  unsigned FirstReg = Inst.getOperand(0).getReg();
  uint64_t ImmOp64 = Inst.getOperand(1).getImm();
 
  uint32_t ImmOp32 = covertDoubleImmToSingleImm(convertIntToDoubleImm(ImmOp64));
 
  return loadImmediate(ImmOp32, FirstReg, Mips::NoRegister, true, false, IDLoc,
                       Out, STI);
}
 
bool MipsAsmParser::expandLoadSingleImmToFPR(MCInst &Inst, SMLoc IDLoc,
                                             MCStreamer &Out,
                                             const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
  assert(Inst.getNumOperands() == 2 && "Invalid operand count");
  assert(Inst.getOperand(0).isReg() && Inst.getOperand(1).isImm() &&
         "Invalid instruction operand.");
 
  unsigned FirstReg = Inst.getOperand(0).getReg();
  uint64_t ImmOp64 = Inst.getOperand(1).getImm();
 
  ImmOp64 = convertIntToDoubleImm(ImmOp64);
 
  uint32_t ImmOp32 = covertDoubleImmToSingleImm(ImmOp64);
 
  unsigned TmpReg = Mips::ZERO;
  if (ImmOp32 != 0) {
    TmpReg = getATReg(IDLoc);
    if (!TmpReg)
      return true;
  }
 
  if (Lo_32(ImmOp64) == 0) {
    if (TmpReg != Mips::ZERO && loadImmediate(ImmOp32, TmpReg, Mips::NoRegister,
                                              true, false, IDLoc, Out, STI))
      return true;
    TOut.emitRR(Mips::MTC1, FirstReg, TmpReg, IDLoc, STI);
    return false;
  }
 
  MCSection *CS = getStreamer().getCurrentSectionOnly();
  // FIXME: Enhance this expansion to use the .lit4 & .lit8 sections
  // where appropriate.
  MCSection *ReadOnlySection =
      getContext().getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
 
  MCSymbol *Sym = getContext().createTempSymbol();
  const MCExpr *LoSym =
      MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());
  const MipsMCExpr *LoExpr =
      MipsMCExpr::create(MipsMCExpr::MEK_LO, LoSym, getContext());
 
  getStreamer().switchSection(ReadOnlySection);
  getStreamer().emitLabel(Sym, IDLoc);
  getStreamer().emitInt32(ImmOp32);
  getStreamer().switchSection(CS);
 
  if (emitPartialAddress(TOut, IDLoc, Sym))
    return true;
  TOut.emitRRX(Mips::LWC1, FirstReg, TmpReg, MCOperand::createExpr(LoExpr),
               IDLoc, STI);
  return false;
}
 
bool MipsAsmParser::expandLoadDoubleImmToGPR(MCInst &Inst, SMLoc IDLoc,
                                             MCStreamer &Out,
                                             const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
  assert(Inst.getNumOperands() == 2 && "Invalid operand count");
  assert(Inst.getOperand(0).isReg() && Inst.getOperand(1).isImm() &&
         "Invalid instruction operand.");
 
  unsigned FirstReg = Inst.getOperand(0).getReg();
  uint64_t ImmOp64 = Inst.getOperand(1).getImm();
 
  ImmOp64 = convertIntToDoubleImm(ImmOp64);
 
  if (Lo_32(ImmOp64) == 0) {
    if (isGP64bit()) {
      if (loadImmediate(ImmOp64, FirstReg, Mips::NoRegister, false, false,
                        IDLoc, Out, STI))
        return true;
    } else {
      if (loadImmediate(Hi_32(ImmOp64), FirstReg, Mips::NoRegister, true, false,
                        IDLoc, Out, STI))
        return true;
 
      if (loadImmediate(0, nextReg(FirstReg), Mips::NoRegister, true, false,
                        IDLoc, Out, STI))
        return true;
    }
    return false;
  }
 
  MCSection *CS = getStreamer().getCurrentSectionOnly();
  MCSection *ReadOnlySection =
      getContext().getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
 
  MCSymbol *Sym = getContext().createTempSymbol();
  const MCExpr *LoSym =
      MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());
  const MipsMCExpr *LoExpr =
      MipsMCExpr::create(MipsMCExpr::MEK_LO, LoSym, getContext());
 
  getStreamer().switchSection(ReadOnlySection);
  getStreamer().emitLabel(Sym, IDLoc);
  getStreamer().emitValueToAlignment(Align(8));
  getStreamer().emitIntValue(ImmOp64, 8);
  getStreamer().switchSection(CS);
 
  unsigned TmpReg = getATReg(IDLoc);
  if (!TmpReg)
    return true;
 
  if (emitPartialAddress(TOut, IDLoc, Sym))
    return true;
 
  TOut.emitRRX(isABI_N64() ? Mips::DADDiu : Mips::ADDiu, TmpReg, TmpReg,
               MCOperand::createExpr(LoExpr), IDLoc, STI);
 
  if (isGP64bit())
    TOut.emitRRI(Mips::LD, FirstReg, TmpReg, 0, IDLoc, STI);
  else {
    TOut.emitRRI(Mips::LW, FirstReg, TmpReg, 0, IDLoc, STI);
    TOut.emitRRI(Mips::LW, nextReg(FirstReg), TmpReg, 4, IDLoc, STI);
  }
  return false;
}
 
bool MipsAsmParser::expandLoadDoubleImmToFPR(MCInst &Inst, bool Is64FPU,
                                             SMLoc IDLoc, MCStreamer &Out,
                                             const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
  assert(Inst.getNumOperands() == 2 && "Invalid operand count");
  assert(Inst.getOperand(0).isReg() && Inst.getOperand(1).isImm() &&
         "Invalid instruction operand.");
 
  unsigned FirstReg = Inst.getOperand(0).getReg();
  uint64_t ImmOp64 = Inst.getOperand(1).getImm();
 
  ImmOp64 = convertIntToDoubleImm(ImmOp64);
 
  unsigned TmpReg = Mips::ZERO;
  if (ImmOp64 != 0) {
    TmpReg = getATReg(IDLoc);
    if (!TmpReg)
      return true;
  }
 
  if ((Lo_32(ImmOp64) == 0) &&
      !((Hi_32(ImmOp64) & 0xffff0000) && (Hi_32(ImmOp64) & 0x0000ffff))) {
    if (isGP64bit()) {
      if (TmpReg != Mips::ZERO &&
          loadImmediate(ImmOp64, TmpReg, Mips::NoRegister, false, false, IDLoc,
                        Out, STI))
        return true;
      TOut.emitRR(Mips::DMTC1, FirstReg, TmpReg, IDLoc, STI);
      return false;
    }
 
    if (TmpReg != Mips::ZERO &&
        loadImmediate(Hi_32(ImmOp64), TmpReg, Mips::NoRegister, true, false,
                      IDLoc, Out, STI))
      return true;
 
    if (hasMips32r2()) {
      TOut.emitRR(Mips::MTC1, FirstReg, Mips::ZERO, IDLoc, STI);
      TOut.emitRRR(Mips::MTHC1_D32, FirstReg, FirstReg, TmpReg, IDLoc, STI);
    } else {
      TOut.emitRR(Mips::MTC1, nextReg(FirstReg), TmpReg, IDLoc, STI);
      TOut.emitRR(Mips::MTC1, FirstReg, Mips::ZERO, IDLoc, STI);
    }
    return false;
  }
 
  MCSection *CS = getStreamer().getCurrentSectionOnly();
  // FIXME: Enhance this expansion to use the .lit4 & .lit8 sections
  // where appropriate.
  MCSection *ReadOnlySection =
      getContext().getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
 
  MCSymbol *Sym = getContext().createTempSymbol();
  const MCExpr *LoSym =
      MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());
  const MipsMCExpr *LoExpr =
      MipsMCExpr::create(MipsMCExpr::MEK_LO, LoSym, getContext());
 
  getStreamer().switchSection(ReadOnlySection);
  getStreamer().emitLabel(Sym, IDLoc);
  getStreamer().emitValueToAlignment(Align(8));
  getStreamer().emitIntValue(ImmOp64, 8);
  getStreamer().switchSection(CS);
 
  if (emitPartialAddress(TOut, IDLoc, Sym))
    return true;
 
  TOut.emitRRX(Is64FPU ? Mips::LDC164 : Mips::LDC1, FirstReg, TmpReg,
               MCOperand::createExpr(LoExpr), IDLoc, STI);
 
  return false;
}
 
bool MipsAsmParser::expandUncondBranchMMPseudo(MCInst &Inst, SMLoc IDLoc,
                                               MCStreamer &Out,
                                               const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
 
  assert(MII.get(Inst.getOpcode()).getNumOperands() == 1 &&
         "unexpected number of operands");
 
  MCOperand Offset = Inst.getOperand(0);
  if (Offset.isExpr()) {
    Inst.clear();
    Inst.setOpcode(Mips::BEQ_MM);
    Inst.addOperand(MCOperand::createReg(Mips::ZERO));
    Inst.addOperand(MCOperand::createReg(Mips::ZERO));
    Inst.addOperand(MCOperand::createExpr(Offset.getExpr()));
  } else {
    assert(Offset.isImm() && "expected immediate operand kind");
    if (isInt<11>(Offset.getImm())) {
      // If offset fits into 11 bits then this instruction becomes microMIPS
      // 16-bit unconditional branch instruction.
      if (inMicroMipsMode())
        Inst.setOpcode(hasMips32r6() ? Mips::BC16_MMR6 : Mips::B16_MM);
    } else {
      if (!isInt<17>(Offset.getImm()))
        return Error(IDLoc, "branch target out of range");
      if (offsetToAlignment(Offset.getImm(), Align(2)))
        return Error(IDLoc, "branch to misaligned address");
      Inst.clear();
      Inst.setOpcode(Mips::BEQ_MM);
      Inst.addOperand(MCOperand::createReg(Mips::ZERO));
      Inst.addOperand(MCOperand::createReg(Mips::ZERO));
      Inst.addOperand(MCOperand::createImm(Offset.getImm()));
    }
  }
  Out.emitInstruction(Inst, *STI);
 
  // If .set reorder is active and branch instruction has a delay slot,
  // emit a NOP after it.
  const MCInstrDesc &MCID = MII.get(Inst.getOpcode());
  if (MCID.hasDelaySlot() && AssemblerOptions.back()->isReorder())
    TOut.emitEmptyDelaySlot(true, IDLoc, STI);
 
  return false;
}
 
bool MipsAsmParser::expandBranchImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                    const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
  const MCOperand &DstRegOp = Inst.getOperand(0);
  assert(DstRegOp.isReg() && "expected register operand kind");
 
  const MCOperand &ImmOp = Inst.getOperand(1);
  assert(ImmOp.isImm() && "expected immediate operand kind");
 
  const MCOperand &MemOffsetOp = Inst.getOperand(2);
  assert((MemOffsetOp.isImm() || MemOffsetOp.isExpr()) &&
         "expected immediate or expression operand");
 
  bool IsLikely = false;
 
  unsigned OpCode = 0;
  switch(Inst.getOpcode()) {
    case Mips::BneImm:
      OpCode = Mips::BNE;
      break;
    case Mips::BeqImm:
      OpCode = Mips::BEQ;
      break;
    case Mips::BEQLImmMacro:
      OpCode = Mips::BEQL;
      IsLikely = true;
      break;
    case Mips::BNELImmMacro:
      OpCode = Mips::BNEL;
      IsLikely = true;
      break;
    default:
      llvm_unreachable("Unknown immediate branch pseudo-instruction.");
      break;
  }
 
  int64_t ImmValue = ImmOp.getImm();
  if (ImmValue == 0) {
    if (IsLikely) {
      TOut.emitRRX(OpCode, DstRegOp.getReg(), Mips::ZERO,
                   MCOperand::createExpr(MemOffsetOp.getExpr()), IDLoc, STI);
      TOut.emitRRI(Mips::SLL, Mips::ZERO, Mips::ZERO, 0, IDLoc, STI);
    } else
      TOut.emitRRX(OpCode, DstRegOp.getReg(), Mips::ZERO, MemOffsetOp, IDLoc,
              STI);
  } else {
    warnIfNoMacro(IDLoc);
 
    unsigned ATReg = getATReg(IDLoc);
    if (!ATReg)
      return true;
 
    if (loadImmediate(ImmValue, ATReg, Mips::NoRegister, !isGP64bit(), true,
                      IDLoc, Out, STI))
      return true;
 
    if (IsLikely) {
      TOut.emitRRX(OpCode, DstRegOp.getReg(), ATReg,
              MCOperand::createExpr(MemOffsetOp.getExpr()), IDLoc, STI);
      TOut.emitRRI(Mips::SLL, Mips::ZERO, Mips::ZERO, 0, IDLoc, STI);
    } else
      TOut.emitRRX(OpCode, DstRegOp.getReg(), ATReg, MemOffsetOp, IDLoc, STI);
  }
  return false;
}
 
void MipsAsmParser::expandMem16Inst(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                    const MCSubtargetInfo *STI, bool IsLoad) {
  unsigned NumOp = Inst.getNumOperands();
  assert((NumOp == 3 || NumOp == 4) && "unexpected operands number");
  unsigned StartOp = NumOp == 3 ? 0 : 1;
 
  const MCOperand &DstRegOp = Inst.getOperand(StartOp);
  assert(DstRegOp.isReg() && "expected register operand kind");
  const MCOperand &BaseRegOp = Inst.getOperand(StartOp + 1);
  assert(BaseRegOp.isReg() && "expected register operand kind");
  const MCOperand &OffsetOp = Inst.getOperand(StartOp + 2);
 
  MipsTargetStreamer &TOut = getTargetStreamer();
  unsigned OpCode = Inst.getOpcode();
  unsigned DstReg = DstRegOp.getReg();
  unsigned BaseReg = BaseRegOp.getReg();
  unsigned TmpReg = DstReg;
 
  const MCInstrDesc &Desc = MII.get(OpCode);
  int16_t DstRegClass = Desc.operands()[StartOp].RegClass;
  unsigned DstRegClassID =
      getContext().getRegisterInfo()->getRegClass(DstRegClass).getID();
  bool IsGPR = (DstRegClassID == Mips::GPR32RegClassID) ||
               (DstRegClassID == Mips::GPR64RegClassID);
 
  if (!IsLoad || !IsGPR || (BaseReg == DstReg)) {
    // At this point we need AT to perform the expansions
    // and we exit if it is not available.
    TmpReg = getATReg(IDLoc);
    if (!TmpReg)
      return;
  }
 
  auto emitInstWithOffset = [&](const MCOperand &Off) {
    if (NumOp == 3)
      TOut.emitRRX(OpCode, DstReg, TmpReg, Off, IDLoc, STI);
    else
      TOut.emitRRRX(OpCode, DstReg, DstReg, TmpReg, Off, IDLoc, STI);
  };
 
  if (OffsetOp.isImm()) {
    int64_t LoOffset = OffsetOp.getImm() & 0xffff;
    int64_t HiOffset = OffsetOp.getImm() & ~0xffff;
 
    // If msb of LoOffset is 1(negative number) we must increment
    // HiOffset to account for the sign-extension of the low part.
    if (LoOffset & 0x8000)
      HiOffset += 0x10000;
 
    bool IsLargeOffset = HiOffset != 0;
 
    if (IsLargeOffset) {
      bool Is32BitImm = isInt<32>(OffsetOp.getImm());
      if (loadImmediate(HiOffset, TmpReg, Mips::NoRegister, Is32BitImm, true,
                        IDLoc, Out, STI))
        return;
    }
 
    if (BaseReg != Mips::ZERO && BaseReg != Mips::ZERO_64)
      TOut.emitRRR(ABI.ArePtrs64bit() ? Mips::DADDu : Mips::ADDu, TmpReg,
                   TmpReg, BaseReg, IDLoc, STI);
    emitInstWithOffset(MCOperand::createImm(int16_t(LoOffset)));
    return;
  }
 
  if (OffsetOp.isExpr()) {
    if (inPicMode()) {
      // FIXME:
      // c) Check that immediates of R_MIPS_GOT16/R_MIPS_LO16 relocations
      //    do not exceed 16-bit.
      // d) Use R_MIPS_GOT_PAGE/R_MIPS_GOT_OFST relocations instead
      //    of R_MIPS_GOT_DISP in appropriate cases to reduce number
      //    of GOT entries.
      MCValue Res;
      if (!OffsetOp.getExpr()->evaluateAsRelocatable(Res, nullptr, nullptr)) {
        Error(IDLoc, "expected relocatable expression");
        return;
      }
      if (Res.getSymB() != nullptr) {
        Error(IDLoc, "expected relocatable expression with only one symbol");
        return;
      }
 
      loadAndAddSymbolAddress(Res.getSymA(), TmpReg, BaseReg,
                              !ABI.ArePtrs64bit(), IDLoc, Out, STI);
      emitInstWithOffset(MCOperand::createImm(int16_t(Res.getConstant())));
    } else {
      // FIXME: Implement 64-bit case.
      // 1) lw $8, sym => lui $8,  %hi(sym)
      //                  lw  $8,  %lo(sym)($8)
      // 2) sw $8, sym => lui $at, %hi(sym)
      //                  sw  $8,  %lo(sym)($at)
      const MCExpr *OffExpr = OffsetOp.getExpr();
      MCOperand LoOperand = MCOperand::createExpr(
          MipsMCExpr::create(MipsMCExpr::MEK_LO, OffExpr, getContext()));
      MCOperand HiOperand = MCOperand::createExpr(
          MipsMCExpr::create(MipsMCExpr::MEK_HI, OffExpr, getContext()));
 
      if (ABI.IsN64()) {
        MCOperand HighestOperand = MCOperand::createExpr(
            MipsMCExpr::create(MipsMCExpr::MEK_HIGHEST, OffExpr, getContext()));
        MCOperand HigherOperand = MCOperand::createExpr(
            MipsMCExpr::create(MipsMCExpr::MEK_HIGHER, OffExpr, getContext()));
 
        TOut.emitRX(Mips::LUi, TmpReg, HighestOperand, IDLoc, STI);
        TOut.emitRRX(Mips::DADDiu, TmpReg, TmpReg, HigherOperand, IDLoc, STI);
        TOut.emitRRI(Mips::DSLL, TmpReg, TmpReg, 16, IDLoc, STI);
        TOut.emitRRX(Mips::DADDiu, TmpReg, TmpReg, HiOperand, IDLoc, STI);
        TOut.emitRRI(Mips::DSLL, TmpReg, TmpReg, 16, IDLoc, STI);
        if (BaseReg != Mips::ZERO && BaseReg != Mips::ZERO_64)
          TOut.emitRRR(Mips::DADDu, TmpReg, TmpReg, BaseReg, IDLoc, STI);
        emitInstWithOffset(LoOperand);
      } else {
        // Generate the base address in TmpReg.
        TOut.emitRX(Mips::LUi, TmpReg, HiOperand, IDLoc, STI);
        if (BaseReg != Mips::ZERO)
          TOut.emitRRR(Mips::ADDu, TmpReg, TmpReg, BaseReg, IDLoc, STI);
        // Emit the load or store with the adjusted base and offset.
        emitInstWithOffset(LoOperand);
      }
    }
    return;
  }
 
  llvm_unreachable("unexpected operand type");
}
 
void MipsAsmParser::expandMem9Inst(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                   const MCSubtargetInfo *STI, bool IsLoad) {
  unsigned NumOp = Inst.getNumOperands();
  assert((NumOp == 3 || NumOp == 4) && "unexpected operands number");
  unsigned StartOp = NumOp == 3 ? 0 : 1;
 
  const MCOperand &DstRegOp = Inst.getOperand(StartOp);
  assert(DstRegOp.isReg() && "expected register operand kind");
  const MCOperand &BaseRegOp = Inst.getOperand(StartOp + 1);
  assert(BaseRegOp.isReg() && "expected register operand kind");
  const MCOperand &OffsetOp = Inst.getOperand(StartOp + 2);
 
  MipsTargetStreamer &TOut = getTargetStreamer();
  unsigned OpCode = Inst.getOpcode();
  unsigned DstReg = DstRegOp.getReg();
  unsigned BaseReg = BaseRegOp.getReg();
  unsigned TmpReg = DstReg;
 
  const MCInstrDesc &Desc = MII.get(OpCode);
  int16_t DstRegClass = Desc.operands()[StartOp].RegClass;
  unsigned DstRegClassID =
      getContext().getRegisterInfo()->getRegClass(DstRegClass).getID();
  bool IsGPR = (DstRegClassID == Mips::GPR32RegClassID) ||
               (DstRegClassID == Mips::GPR64RegClassID);
 
  if (!IsLoad || !IsGPR || (BaseReg == DstReg)) {
    // At this point we need AT to perform the expansions
    // and we exit if it is not available.
    TmpReg = getATReg(IDLoc);
    if (!TmpReg)
      return;
  }
 
  auto emitInst = [&]() {
    if (NumOp == 3)
      TOut.emitRRX(OpCode, DstReg, TmpReg, MCOperand::createImm(0), IDLoc, STI);
    else
      TOut.emitRRRX(OpCode, DstReg, DstReg, TmpReg, MCOperand::createImm(0),
                    IDLoc, STI);
  };
 
  if (OffsetOp.isImm()) {
    loadImmediate(OffsetOp.getImm(), TmpReg, BaseReg, !ABI.ArePtrs64bit(), true,
                  IDLoc, Out, STI);
    emitInst();
    return;
  }
 
  if (OffsetOp.isExpr()) {
    loadAndAddSymbolAddress(OffsetOp.getExpr(), TmpReg, BaseReg,
                            !ABI.ArePtrs64bit(), IDLoc, Out, STI);
    emitInst();
    return;
  }
 
  llvm_unreachable("unexpected operand type");
}
 
bool MipsAsmParser::expandLoadStoreMultiple(MCInst &Inst, SMLoc IDLoc,
                                            MCStreamer &Out,
                                            const MCSubtargetInfo *STI) {
  unsigned OpNum = Inst.getNumOperands();
  unsigned Opcode = Inst.getOpcode();
  unsigned NewOpcode = Opcode == Mips::SWM_MM ? Mips::SWM32_MM : Mips::LWM32_MM;
 
  assert(Inst.getOperand(OpNum - 1).isImm() &&
         Inst.getOperand(OpNum - 2).isReg() &&
         Inst.getOperand(OpNum - 3).isReg() && "Invalid instruction operand.");
 
  if (OpNum < 8 && Inst.getOperand(OpNum - 1).getImm() <= 60 &&
      Inst.getOperand(OpNum - 1).getImm() >= 0 &&
      (Inst.getOperand(OpNum - 2).getReg() == Mips::SP ||
       Inst.getOperand(OpNum - 2).getReg() == Mips::SP_64) &&
      (Inst.getOperand(OpNum - 3).getReg() == Mips::RA ||
       Inst.getOperand(OpNum - 3).getReg() == Mips::RA_64)) {
    // It can be implemented as SWM16 or LWM16 instruction.
    if (inMicroMipsMode() && hasMips32r6())
      NewOpcode = Opcode == Mips::SWM_MM ? Mips::SWM16_MMR6 : Mips::LWM16_MMR6;
    else
      NewOpcode = Opcode == Mips::SWM_MM ? Mips::SWM16_MM : Mips::LWM16_MM;
  }
 
  Inst.setOpcode(NewOpcode);
  Out.emitInstruction(Inst, *STI);
  return false;
}
 
bool MipsAsmParser::expandCondBranches(MCInst &Inst, SMLoc IDLoc,
                                       MCStreamer &Out,
                                       const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
  bool EmittedNoMacroWarning = false;
  unsigned PseudoOpcode = Inst.getOpcode();
  unsigned SrcReg = Inst.getOperand(0).getReg();
  const MCOperand &TrgOp = Inst.getOperand(1);
  const MCExpr *OffsetExpr = Inst.getOperand(2).getExpr();
 
  unsigned ZeroSrcOpcode, ZeroTrgOpcode;
  bool ReverseOrderSLT, IsUnsigned, IsLikely, AcceptsEquality;
 
  unsigned TrgReg;
  if (TrgOp.isReg())
    TrgReg = TrgOp.getReg();
  else if (TrgOp.isImm()) {
    warnIfNoMacro(IDLoc);
    EmittedNoMacroWarning = true;
 
    TrgReg = getATReg(IDLoc);
    if (!TrgReg)
      return true;
 
    switch(PseudoOpcode) {
    default:
      llvm_unreachable("unknown opcode for branch pseudo-instruction");
    case Mips::BLTImmMacro:
      PseudoOpcode = Mips::BLT;
      break;
    case Mips::BLEImmMacro:
      PseudoOpcode = Mips::BLE;
      break;
    case Mips::BGEImmMacro:
      PseudoOpcode = Mips::BGE;
      break;
    case Mips::BGTImmMacro:
      PseudoOpcode = Mips::BGT;
      break;
    case Mips::BLTUImmMacro:
      PseudoOpcode = Mips::BLTU;
      break;
    case Mips::BLEUImmMacro:
      PseudoOpcode = Mips::BLEU;
      break;
    case Mips::BGEUImmMacro:
      PseudoOpcode = Mips::BGEU;
      break;
    case Mips::BGTUImmMacro:
      PseudoOpcode = Mips::BGTU;
      break;
    case Mips::BLTLImmMacro:
      PseudoOpcode = Mips::BLTL;
      break;
    case Mips::BLELImmMacro:
      PseudoOpcode = Mips::BLEL;
      break;
    case Mips::BGELImmMacro:
      PseudoOpcode = Mips::BGEL;
      break;
    case Mips::BGTLImmMacro:
      PseudoOpcode = Mips::BGTL;
      break;
    case Mips::BLTULImmMacro:
      PseudoOpcode = Mips::BLTUL;
      break;
    case Mips::BLEULImmMacro:
      PseudoOpcode = Mips::BLEUL;
      break;
    case Mips::BGEULImmMacro:
      PseudoOpcode = Mips::BGEUL;
      break;
    case Mips::BGTULImmMacro:
      PseudoOpcode = Mips::BGTUL;
      break;
    }
 
    if (loadImmediate(TrgOp.getImm(), TrgReg, Mips::NoRegister, !isGP64bit(),
                      false, IDLoc, Out, STI))
      return true;
  }
 
  switch (PseudoOpcode) {
  case Mips::BLT:
  case Mips::BLTU:
  case Mips::BLTL:
  case Mips::BLTUL:
    AcceptsEquality = false;
    ReverseOrderSLT = false;
    IsUnsigned =
        ((PseudoOpcode == Mips::BLTU) || (PseudoOpcode == Mips::BLTUL));
    IsLikely = ((PseudoOpcode == Mips::BLTL) || (PseudoOpcode == Mips::BLTUL));
    ZeroSrcOpcode = Mips::BGTZ;
    ZeroTrgOpcode = Mips::BLTZ;
    break;
  case Mips::BLE:
  case Mips::BLEU:
  case Mips::BLEL:
  case Mips::BLEUL:
    AcceptsEquality = true;
    ReverseOrderSLT = true;
    IsUnsigned =
        ((PseudoOpcode == Mips::BLEU) || (PseudoOpcode == Mips::BLEUL));
    IsLikely = ((PseudoOpcode == Mips::BLEL) || (PseudoOpcode == Mips::BLEUL));
    ZeroSrcOpcode = Mips::BGEZ;
    ZeroTrgOpcode = Mips::BLEZ;
    break;
  case Mips::BGE:
  case Mips::BGEU:
  case Mips::BGEL:
  case Mips::BGEUL:
    AcceptsEquality = true;
    ReverseOrderSLT = false;
    IsUnsigned =
        ((PseudoOpcode == Mips::BGEU) || (PseudoOpcode == Mips::BGEUL));
    IsLikely = ((PseudoOpcode == Mips::BGEL) || (PseudoOpcode == Mips::BGEUL));
    ZeroSrcOpcode = Mips::BLEZ;
    ZeroTrgOpcode = Mips::BGEZ;
    break;
  case Mips::BGT:
  case Mips::BGTU:
  case Mips::BGTL:
  case Mips::BGTUL:
    AcceptsEquality = false;
    ReverseOrderSLT = true;
    IsUnsigned =
        ((PseudoOpcode == Mips::BGTU) || (PseudoOpcode == Mips::BGTUL));
    IsLikely = ((PseudoOpcode == Mips::BGTL) || (PseudoOpcode == Mips::BGTUL));
    ZeroSrcOpcode = Mips::BLTZ;
    ZeroTrgOpcode = Mips::BGTZ;
    break;
  default:
    llvm_unreachable("unknown opcode for branch pseudo-instruction");
  }
 
  bool IsTrgRegZero = (TrgReg == Mips::ZERO);
  bool IsSrcRegZero = (SrcReg == Mips::ZERO);
  if (IsSrcRegZero && IsTrgRegZero) {
    // FIXME: All of these Opcode-specific if's are needed for compatibility
    // with GAS' behaviour. However, they may not generate the most efficient
    // code in some circumstances.
    if (PseudoOpcode == Mips::BLT) {
      TOut.emitRX(Mips::BLTZ, Mips::ZERO, MCOperand::createExpr(OffsetExpr),
                  IDLoc, STI);
      return false;
    }
    if (PseudoOpcode == Mips::BLE) {
      TOut.emitRX(Mips::BLEZ, Mips::ZERO, MCOperand::createExpr(OffsetExpr),
                  IDLoc, STI);
      Warning(IDLoc, "branch is always taken");
      return false;
    }
    if (PseudoOpcode == Mips::BGE) {
      TOut.emitRX(Mips::BGEZ, Mips::ZERO, MCOperand::createExpr(OffsetExpr),
                  IDLoc, STI);
      Warning(IDLoc, "branch is always taken");
      return false;
    }
    if (PseudoOpcode == Mips::BGT) {
      TOut.emitRX(Mips::BGTZ, Mips::ZERO, MCOperand::createExpr(OffsetExpr),
                  IDLoc, STI);
      return false;
    }
    if (PseudoOpcode == Mips::BGTU) {
      TOut.emitRRX(Mips::BNE, Mips::ZERO, Mips::ZERO,
                   MCOperand::createExpr(OffsetExpr), IDLoc, STI);
      return false;
    }
    if (AcceptsEquality) {
      // If both registers are $0 and the pseudo-branch accepts equality, it
      // will always be taken, so we emit an unconditional branch.
      TOut.emitRRX(Mips::BEQ, Mips::ZERO, Mips::ZERO,
                   MCOperand::createExpr(OffsetExpr), IDLoc, STI);
      Warning(IDLoc, "branch is always taken");
      return false;
    }
    // If both registers are $0 and the pseudo-branch does not accept
    // equality, it will never be taken, so we don't have to emit anything.
    return false;
  }
  if (IsSrcRegZero || IsTrgRegZero) {
    if ((IsSrcRegZero && PseudoOpcode == Mips::BGTU) ||
        (IsTrgRegZero && PseudoOpcode == Mips::BLTU)) {
      // If the $rs is $0 and the pseudo-branch is BGTU (0 > x) or
      // if the $rt is $0 and the pseudo-branch is BLTU (x < 0),
      // the pseudo-branch will never be taken, so we don't emit anything.
      // This only applies to unsigned pseudo-branches.
      return false;
    }
    if ((IsSrcRegZero && PseudoOpcode == Mips::BLEU) ||
        (IsTrgRegZero && PseudoOpcode == Mips::BGEU)) {
      // If the $rs is $0 and the pseudo-branch is BLEU (0 <= x) or
      // if the $rt is $0 and the pseudo-branch is BGEU (x >= 0),
      // the pseudo-branch will always be taken, so we emit an unconditional
      // branch.
      // This only applies to unsigned pseudo-branches.
      TOut.emitRRX(Mips::BEQ, Mips::ZERO, Mips::ZERO,
                   MCOperand::createExpr(OffsetExpr), IDLoc, STI);
      Warning(IDLoc, "branch is always taken");
      return false;
    }
    if (IsUnsigned) {
      // If the $rs is $0 and the pseudo-branch is BLTU (0 < x) or
      // if the $rt is $0 and the pseudo-branch is BGTU (x > 0),
      // the pseudo-branch will be taken only when the non-zero register is
      // different from 0, so we emit a BNEZ.
      //
      // If the $rs is $0 and the pseudo-branch is BGEU (0 >= x) or
      // if the $rt is $0 and the pseudo-branch is BLEU (x <= 0),
      // the pseudo-branch will be taken only when the non-zero register is
      // equal to 0, so we emit a BEQZ.
      //
      // Because only BLEU and BGEU branch on equality, we can use the
      // AcceptsEquality variable to decide when to emit the BEQZ.
      TOut.emitRRX(AcceptsEquality ? Mips::BEQ : Mips::BNE,
                   IsSrcRegZero ? TrgReg : SrcReg, Mips::ZERO,
                   MCOperand::createExpr(OffsetExpr), IDLoc, STI);
      return false;
    }
    // If we have a signed pseudo-branch and one of the registers is $0,
    // we can use an appropriate compare-to-zero branch. We select which one
    // to use in the switch statement above.
    TOut.emitRX(IsSrcRegZero ? ZeroSrcOpcode : ZeroTrgOpcode,
                IsSrcRegZero ? TrgReg : SrcReg,
                MCOperand::createExpr(OffsetExpr), IDLoc, STI);
    return false;
  }
 
  // If neither the SrcReg nor the TrgReg are $0, we need AT to perform the
  // expansions. If it is not available, we return.
  unsigned ATRegNum = getATReg(IDLoc);
  if (!ATRegNum)
    return true;
 
  if (!EmittedNoMacroWarning)
    warnIfNoMacro(IDLoc);
 
  // SLT fits well with 2 of our 4 pseudo-branches:
  //   BLT, where $rs < $rt, translates into "slt $at, $rs, $rt" and
  //   BGT, where $rs > $rt, translates into "slt $at, $rt, $rs".
  // If the result of the SLT is 1, we branch, and if it's 0, we don't.
  // This is accomplished by using a BNEZ with the result of the SLT.
  //
  // The other 2 pseudo-branches are opposites of the above 2 (BGE with BLT
  // and BLE with BGT), so we change the BNEZ into a BEQZ.
  // Because only BGE and BLE branch on equality, we can use the
  // AcceptsEquality variable to decide when to emit the BEQZ.
  // Note that the order of the SLT arguments doesn't change between
  // opposites.
  //
  // The same applies to the unsigned variants, except that SLTu is used
  // instead of SLT.
  TOut.emitRRR(IsUnsigned ? Mips::SLTu : Mips::SLT, ATRegNum,
               ReverseOrderSLT ? TrgReg : SrcReg,
               ReverseOrderSLT ? SrcReg : TrgReg, IDLoc, STI);
 
  TOut.emitRRX(IsLikely ? (AcceptsEquality ? Mips::BEQL : Mips::BNEL)
                        : (AcceptsEquality ? Mips::BEQ : Mips::BNE),
               ATRegNum, Mips::ZERO, MCOperand::createExpr(OffsetExpr), IDLoc,
               STI);
  return false;
}
 
// Expand a integer division macro.
//
// Notably we don't have to emit a warning when encountering $rt as the $zero
// register, or 0 as an immediate. processInstruction() has already done that.
//
// The destination register can only be $zero when expanding (S)DivIMacro or
// D(S)DivMacro.
 
bool MipsAsmParser::expandDivRem(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                 const MCSubtargetInfo *STI,
                                 const bool IsMips64, const bool Signed) {
  MipsTargetStreamer &TOut = getTargetStreamer();
 
  warnIfNoMacro(IDLoc);
 
  const MCOperand &RdRegOp = Inst.getOperand(0);
  assert(RdRegOp.isReg() && "expected register operand kind");
  unsigned RdReg = RdRegOp.getReg();
 
  const MCOperand &RsRegOp = Inst.getOperand(1);
  assert(RsRegOp.isReg() && "expected register operand kind");
  unsigned RsReg = RsRegOp.getReg();
 
  unsigned RtReg;
  int64_t ImmValue;
 
  const MCOperand &RtOp = Inst.getOperand(2);
  assert((RtOp.isReg() || RtOp.isImm()) &&
         "expected register or immediate operand kind");
  if (RtOp.isReg())
    RtReg = RtOp.getReg();
  else
    ImmValue = RtOp.getImm();
 
  unsigned DivOp;
  unsigned ZeroReg;
  unsigned SubOp;
 
  if (IsMips64) {
    DivOp = Signed ? Mips::DSDIV : Mips::DUDIV;
    ZeroReg = Mips::ZERO_64;
    SubOp = Mips::DSUB;
  } else {
    DivOp = Signed ? Mips::SDIV : Mips::UDIV;
    ZeroReg = Mips::ZERO;
    SubOp = Mips::SUB;
  }
 
  bool UseTraps = useTraps();
 
  unsigned Opcode = Inst.getOpcode();
  bool isDiv = Opcode == Mips::SDivMacro || Opcode == Mips::SDivIMacro ||
               Opcode == Mips::UDivMacro || Opcode == Mips::UDivIMacro ||
               Opcode == Mips::DSDivMacro || Opcode == Mips::DSDivIMacro ||
               Opcode == Mips::DUDivMacro || Opcode == Mips::DUDivIMacro;
 
  bool isRem = Opcode == Mips::SRemMacro || Opcode == Mips::SRemIMacro ||
               Opcode == Mips::URemMacro || Opcode == Mips::URemIMacro ||
               Opcode == Mips::DSRemMacro || Opcode == Mips::DSRemIMacro ||
               Opcode == Mips::DURemMacro || Opcode == Mips::DURemIMacro;
 
  if (RtOp.isImm()) {
    unsigned ATReg = getATReg(IDLoc);
    if (!ATReg)
      return true;
 
    if (ImmValue == 0) {
      if (UseTraps)
        TOut.emitRRI(Mips::TEQ, ZeroReg, ZeroReg, 0x7, IDLoc, STI);
      else
        TOut.emitII(Mips::BREAK, 0x7, 0, IDLoc, STI);
      return false;
    }
 
    if (isRem && (ImmValue == 1 || (Signed && (ImmValue == -1)))) {
      TOut.emitRRR(Mips::OR, RdReg, ZeroReg, ZeroReg, IDLoc, STI);
      return false;
    } else if (isDiv && ImmValue == 1) {
      TOut.emitRRR(Mips::OR, RdReg, RsReg, Mips::ZERO, IDLoc, STI);
      return false;
    } else if (isDiv && Signed && ImmValue == -1) {
      TOut.emitRRR(SubOp, RdReg, ZeroReg, RsReg, IDLoc, STI);
      return false;
    } else {
      if (loadImmediate(ImmValue, ATReg, Mips::NoRegister, isInt<32>(ImmValue),
                        false, Inst.getLoc(), Out, STI))
        return true;
      TOut.emitRR(DivOp, RsReg, ATReg, IDLoc, STI);
      TOut.emitR(isDiv ? Mips::MFLO : Mips::MFHI, RdReg, IDLoc, STI);
      return false;
    }
    return true;
  }
 
  // If the macro expansion of (d)div(u) or (d)rem(u) would always trap or
  // break, insert the trap/break and exit. This gives a different result to
  // GAS. GAS has an inconsistency/missed optimization in that not all cases
  // are handled equivalently. As the observed behaviour is the same, we're ok.
  if (RtReg == Mips::ZERO || RtReg == Mips::ZERO_64) {
    if (UseTraps) {
      TOut.emitRRI(Mips::TEQ, ZeroReg, ZeroReg, 0x7, IDLoc, STI);
      return false;
    }
    TOut.emitII(Mips::BREAK, 0x7, 0, IDLoc, STI);
    return false;
  }
 
  // (d)rem(u) $0, $X, $Y is a special case. Like div $zero, $X, $Y, it does
  // not expand to macro sequence.
  if (isRem && (RdReg == Mips::ZERO || RdReg == Mips::ZERO_64)) {
    TOut.emitRR(DivOp, RsReg, RtReg, IDLoc, STI);
    return false;
  }
 
  // Temporary label for first branch traget
  MCContext &Context = TOut.getStreamer().getContext();
  MCSymbol *BrTarget;
  MCOperand LabelOp;
 
  if (UseTraps) {
    TOut.emitRRI(Mips::TEQ, RtReg, ZeroReg, 0x7, IDLoc, STI);
  } else {
    // Branch to the li instruction.
    BrTarget = Context.createTempSymbol();
    LabelOp = MCOperand::createExpr(MCSymbolRefExpr::create(BrTarget, Context));
    TOut.emitRRX(Mips::BNE, RtReg, ZeroReg, LabelOp, IDLoc, STI);
  }
 
  TOut.emitRR(DivOp, RsReg, RtReg, IDLoc, STI);
 
  if (!UseTraps)
    TOut.emitII(Mips::BREAK, 0x7, 0, IDLoc, STI);
 
  if (!Signed) {
    if (!UseTraps)
      TOut.getStreamer().emitLabel(BrTarget);
 
    TOut.emitR(isDiv ? Mips::MFLO : Mips::MFHI, RdReg, IDLoc, STI);
    return false;
  }
 
  unsigned ATReg = getATReg(IDLoc);
  if (!ATReg)
    return true;
 
  if (!UseTraps)
    TOut.getStreamer().emitLabel(BrTarget);
 
  TOut.emitRRI(Mips::ADDiu, ATReg, ZeroReg, -1, IDLoc, STI);
 
  // Temporary label for the second branch target.
  MCSymbol *BrTargetEnd = Context.createTempSymbol();
  MCOperand LabelOpEnd =
      MCOperand::createExpr(MCSymbolRefExpr::create(BrTargetEnd, Context));
 
  // Branch to the mflo instruction.
  TOut.emitRRX(Mips::BNE, RtReg, ATReg, LabelOpEnd, IDLoc, STI);
 
  if (IsMips64) {
    TOut.emitRRI(Mips::ADDiu, ATReg, ZeroReg, 1, IDLoc, STI);
    TOut.emitDSLL(ATReg, ATReg, 63, IDLoc, STI);
  } else {
    TOut.emitRI(Mips::LUi, ATReg, (uint16_t)0x8000, IDLoc, STI);
  }
 
  if (UseTraps)
    TOut.emitRRI(Mips::TEQ, RsReg, ATReg, 0x6, IDLoc, STI);
  else {
    // Branch to the mflo instruction.
    TOut.emitRRX(Mips::BNE, RsReg, ATReg, LabelOpEnd, IDLoc, STI);
    TOut.emitNop(IDLoc, STI);
    TOut.emitII(Mips::BREAK, 0x6, 0, IDLoc, STI);
  }
 
  TOut.getStreamer().emitLabel(BrTargetEnd);
  TOut.emitR(isDiv ? Mips::MFLO : Mips::MFHI, RdReg, IDLoc, STI);
  return false;
}
 
bool MipsAsmParser::expandTrunc(MCInst &Inst, bool IsDouble, bool Is64FPU,
                                SMLoc IDLoc, MCStreamer &Out,
                                const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
 
  assert(Inst.getNumOperands() == 3 && "Invalid operand count");
  assert(Inst.getOperand(0).isReg() && Inst.getOperand(1).isReg() &&
         Inst.getOperand(2).isReg() && "Invalid instruction operand.");
 
  unsigned FirstReg = Inst.getOperand(0).getReg();
  unsigned SecondReg = Inst.getOperand(1).getReg();
  unsigned ThirdReg = Inst.getOperand(2).getReg();
 
  if (hasMips1() && !hasMips2()) {
    unsigned ATReg = getATReg(IDLoc);
    if (!ATReg)
      return true;
    TOut.emitRR(Mips::CFC1, ThirdReg, Mips::RA, IDLoc, STI);
    TOut.emitRR(Mips::CFC1, ThirdReg, Mips::RA, IDLoc, STI);
    TOut.emitNop(IDLoc, STI);
    TOut.emitRRI(Mips::ORi, ATReg, ThirdReg, 0x3, IDLoc, STI);
    TOut.emitRRI(Mips::XORi, ATReg, ATReg, 0x2, IDLoc, STI);
    TOut.emitRR(Mips::CTC1, Mips::RA, ATReg, IDLoc, STI);
    TOut.emitNop(IDLoc, STI);
    TOut.emitRR(IsDouble ? (Is64FPU ? Mips::CVT_W_D64 : Mips::CVT_W_D32)
                         : Mips::CVT_W_S,
                FirstReg, SecondReg, IDLoc, STI);
    TOut.emitRR(Mips::CTC1, Mips::RA, ThirdReg, IDLoc, STI);
    TOut.emitNop(IDLoc, STI);
    return false;
  }
 
  TOut.emitRR(IsDouble ? (Is64FPU ? Mips::TRUNC_W_D64 : Mips::TRUNC_W_D32)
                       : Mips::TRUNC_W_S,
              FirstReg, SecondReg, IDLoc, STI);
 
  return false;
}
 
bool MipsAsmParser::expandUlh(MCInst &Inst, bool Signed, SMLoc IDLoc,
                              MCStreamer &Out, const MCSubtargetInfo *STI) {
  if (hasMips32r6() || hasMips64r6()) {
    return Error(IDLoc, "instruction not supported on mips32r6 or mips64r6");
  }
 
  const MCOperand &DstRegOp = Inst.getOperand(0);
  assert(DstRegOp.isReg() && "expected register operand kind");
  const MCOperand &SrcRegOp = Inst.getOperand(1);
  assert(SrcRegOp.isReg() && "expected register operand kind");
  const MCOperand &OffsetImmOp = Inst.getOperand(2);
  assert(OffsetImmOp.isImm() && "expected immediate operand kind");
 
  MipsTargetStreamer &TOut = getTargetStreamer();
  unsigned DstReg = DstRegOp.getReg();
  unsigned SrcReg = SrcRegOp.getReg();
  int64_t OffsetValue = OffsetImmOp.getImm();
 
  // NOTE: We always need AT for ULHU, as it is always used as the source
  // register for one of the LBu's.
  warnIfNoMacro(IDLoc);
  unsigned ATReg = getATReg(IDLoc);
  if (!ATReg)
    return true;
 
  bool IsLargeOffset = !(isInt<16>(OffsetValue + 1) && isInt<16>(OffsetValue));
  if (IsLargeOffset) {
    if (loadImmediate(OffsetValue, ATReg, SrcReg, !ABI.ArePtrs64bit(), true,
                      IDLoc, Out, STI))
      return true;
  }
 
  int64_t FirstOffset = IsLargeOffset ? 0 : OffsetValue;
  int64_t SecondOffset = IsLargeOffset ? 1 : (OffsetValue + 1);
  if (isLittle())
    std::swap(FirstOffset, SecondOffset);
 
  unsigned FirstLbuDstReg = IsLargeOffset ? DstReg : ATReg;
  unsigned SecondLbuDstReg = IsLargeOffset ? ATReg : DstReg;
 
  unsigned LbuSrcReg = IsLargeOffset ? ATReg : SrcReg;
  unsigned SllReg = IsLargeOffset ? DstReg : ATReg;
 
  TOut.emitRRI(Signed ? Mips::LB : Mips::LBu, FirstLbuDstReg, LbuSrcReg,
               FirstOffset, IDLoc, STI);
  TOut.emitRRI(Mips::LBu, SecondLbuDstReg, LbuSrcReg, SecondOffset, IDLoc, STI);
  TOut.emitRRI(Mips::SLL, SllReg, SllReg, 8, IDLoc, STI);
  TOut.emitRRR(Mips::OR, DstReg, DstReg, ATReg, IDLoc, STI);
 
  return false;
}
 
bool MipsAsmParser::expandUsh(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                              const MCSubtargetInfo *STI) {
  if (hasMips32r6() || hasMips64r6()) {
    return Error(IDLoc, "instruction not supported on mips32r6 or mips64r6");
  }
 
  const MCOperand &DstRegOp = Inst.getOperand(0);
  assert(DstRegOp.isReg() && "expected register operand kind");
  const MCOperand &SrcRegOp = Inst.getOperand(1);
  assert(SrcRegOp.isReg() && "expected register operand kind");
  const MCOperand &OffsetImmOp = Inst.getOperand(2);
  assert(OffsetImmOp.isImm() && "expected immediate operand kind");
 
  MipsTargetStreamer &TOut = getTargetStreamer();
  unsigned DstReg = DstRegOp.getReg();
  unsigned SrcReg = SrcRegOp.getReg();
  int64_t OffsetValue = OffsetImmOp.getImm();
 
  warnIfNoMacro(IDLoc);
  unsigned ATReg = getATReg(IDLoc);
  if (!ATReg)
    return true;
 
  bool IsLargeOffset = !(isInt<16>(OffsetValue + 1) && isInt<16>(OffsetValue));
  if (IsLargeOffset) {
    if (loadImmediate(OffsetValue, ATReg, SrcReg, !ABI.ArePtrs64bit(), true,
                      IDLoc, Out, STI))
      return true;
  }
 
  int64_t FirstOffset = IsLargeOffset ? 1 : (OffsetValue + 1);
  int64_t SecondOffset = IsLargeOffset ? 0 : OffsetValue;
  if (isLittle())
    std::swap(FirstOffset, SecondOffset);
 
  if (IsLargeOffset) {
    TOut.emitRRI(Mips::SB, DstReg, ATReg, FirstOffset, IDLoc, STI);
    TOut.emitRRI(Mips::SRL, DstReg, DstReg, 8, IDLoc, STI);
    TOut.emitRRI(Mips::SB, DstReg, ATReg, SecondOffset, IDLoc, STI);
    TOut.emitRRI(Mips::LBu, ATReg, ATReg, 0, IDLoc, STI);
    TOut.emitRRI(Mips::SLL, DstReg, DstReg, 8, IDLoc, STI);
    TOut.emitRRR(Mips::OR, DstReg, DstReg, ATReg, IDLoc, STI);
  } else {
    TOut.emitRRI(Mips::SB, DstReg, SrcReg, FirstOffset, IDLoc, STI);
    TOut.emitRRI(Mips::SRL, ATReg, DstReg, 8, IDLoc, STI);
    TOut.emitRRI(Mips::SB, ATReg, SrcReg, SecondOffset, IDLoc, STI);
  }
 
  return false;
}
 
bool MipsAsmParser::expandUxw(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                              const MCSubtargetInfo *STI) {
  if (hasMips32r6() || hasMips64r6()) {
    return Error(IDLoc, "instruction not supported on mips32r6 or mips64r6");
  }
 
  const MCOperand &DstRegOp = Inst.getOperand(0);
  assert(DstRegOp.isReg() && "expected register operand kind");
  const MCOperand &SrcRegOp = Inst.getOperand(1);
  assert(SrcRegOp.isReg() && "expected register operand kind");
  const MCOperand &OffsetImmOp = Inst.getOperand(2);
  assert(OffsetImmOp.isImm() && "expected immediate operand kind");
 
  MipsTargetStreamer &TOut = getTargetStreamer();
  unsigned DstReg = DstRegOp.getReg();
  unsigned SrcReg = SrcRegOp.getReg();
  int64_t OffsetValue = OffsetImmOp.getImm();
 
  // Compute left/right load/store offsets.
  bool IsLargeOffset = !(isInt<16>(OffsetValue + 3) && isInt<16>(OffsetValue));
  int64_t LxlOffset = IsLargeOffset ? 0 : OffsetValue;
  int64_t LxrOffset = IsLargeOffset ? 3 : (OffsetValue + 3);
  if (isLittle())
    std::swap(LxlOffset, LxrOffset);
 
  bool IsLoadInst = (Inst.getOpcode() == Mips::Ulw);
  bool DoMove = IsLoadInst && (SrcReg == DstReg) && !IsLargeOffset;
  unsigned TmpReg = SrcReg;
  if (IsLargeOffset || DoMove) {
    warnIfNoMacro(IDLoc);
    TmpReg = getATReg(IDLoc);
    if (!TmpReg)
      return true;
  }
 
  if (IsLargeOffset) {
    if (loadImmediate(OffsetValue, TmpReg, SrcReg, !ABI.ArePtrs64bit(), true,
                      IDLoc, Out, STI))
      return true;
  }
 
  if (DoMove)
    std::swap(DstReg, TmpReg);
 
  unsigned XWL = IsLoadInst ? Mips::LWL : Mips::SWL;
  unsigned XWR = IsLoadInst ? Mips::LWR : Mips::SWR;
  TOut.emitRRI(XWL, DstReg, TmpReg, LxlOffset, IDLoc, STI);
  TOut.emitRRI(XWR, DstReg, TmpReg, LxrOffset, IDLoc, STI);
 
  if (DoMove)
    TOut.emitRRR(Mips::OR, TmpReg, DstReg, Mips::ZERO, IDLoc, STI);
 
  return false;
}
 
bool MipsAsmParser::expandSge(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                              const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
 
  assert(Inst.getNumOperands() == 3 && "Invalid operand count");
  assert(Inst.getOperand(0).isReg() &&
         Inst.getOperand(1).isReg() &&
         Inst.getOperand(2).isReg() && "Invalid instruction operand.");
 
  unsigned DstReg = Inst.getOperand(0).getReg();
  unsigned SrcReg = Inst.getOperand(1).getReg();
  unsigned OpReg = Inst.getOperand(2).getReg();
  unsigned OpCode;
 
  warnIfNoMacro(IDLoc);
 
  switch (Inst.getOpcode()) {
  case Mips::SGE:
    OpCode = Mips::SLT;
    break;
  case Mips::SGEU:
    OpCode = Mips::SLTu;
    break;
  default:
    llvm_unreachable("unexpected 'sge' opcode");
  }
 
  // $SrcReg >= $OpReg is equal to (not ($SrcReg < $OpReg))
  TOut.emitRRR(OpCode, DstReg, SrcReg, OpReg, IDLoc, STI);
  TOut.emitRRI(Mips::XORi, DstReg, DstReg, 1, IDLoc, STI);
 
  return false;
}
 
bool MipsAsmParser::expandSgeImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                 const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
 
  assert(Inst.getNumOperands() == 3 && "Invalid operand count");
  assert(Inst.getOperand(0).isReg() &&
         Inst.getOperand(1).isReg() &&
         Inst.getOperand(2).isImm() && "Invalid instruction operand.");
 
  unsigned DstReg = Inst.getOperand(0).getReg();
  unsigned SrcReg = Inst.getOperand(1).getReg();
  int64_t ImmValue = Inst.getOperand(2).getImm();
  unsigned OpRegCode, OpImmCode;
 
  warnIfNoMacro(IDLoc);
 
  switch (Inst.getOpcode()) {
  case Mips::SGEImm:
  case Mips::SGEImm64:
    OpRegCode = Mips::SLT;
    OpImmCode = Mips::SLTi;
    break;
  case Mips::SGEUImm:
  case Mips::SGEUImm64:
    OpRegCode = Mips::SLTu;
    OpImmCode = Mips::SLTiu;
    break;
  default:
    llvm_unreachable("unexpected 'sge' opcode with immediate");
  }
 
  // $SrcReg >= Imm is equal to (not ($SrcReg < Imm))
  if (isInt<16>(ImmValue)) {
    // Use immediate version of STL.
    TOut.emitRRI(OpImmCode, DstReg, SrcReg, ImmValue, IDLoc, STI);
    TOut.emitRRI(Mips::XORi, DstReg, DstReg, 1, IDLoc, STI);
  } else {
    unsigned ImmReg = DstReg;
    if (DstReg == SrcReg) {
      unsigned ATReg = getATReg(Inst.getLoc());
      if (!ATReg)
        return true;
      ImmReg = ATReg;
    }
 
    if (loadImmediate(ImmValue, ImmReg, Mips::NoRegister, isInt<32>(ImmValue),
                      false, IDLoc, Out, STI))
      return true;
 
    TOut.emitRRR(OpRegCode, DstReg, SrcReg, ImmReg, IDLoc, STI);
    TOut.emitRRI(Mips::XORi, DstReg, DstReg, 1, IDLoc, STI);
  }
 
  return false;
}
 
bool MipsAsmParser::expandSgtImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                 const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
 
  assert(Inst.getNumOperands() == 3 && "Invalid operand count");
  assert(Inst.getOperand(0).isReg() &&
         Inst.getOperand(1).isReg() &&
         Inst.getOperand(2).isImm() && "Invalid instruction operand.");
 
  unsigned DstReg = Inst.getOperand(0).getReg();
  unsigned SrcReg = Inst.getOperand(1).getReg();
  unsigned ImmReg = DstReg;
  int64_t ImmValue = Inst.getOperand(2).getImm();
  unsigned OpCode;
 
  warnIfNoMacro(IDLoc);
 
  switch (Inst.getOpcode()) {
  case Mips::SGTImm:
  case Mips::SGTImm64:
    OpCode = Mips::SLT;
    break;
  case Mips::SGTUImm:
  case Mips::SGTUImm64:
    OpCode = Mips::SLTu;
    break;
  default:
    llvm_unreachable("unexpected 'sgt' opcode with immediate");
  }
 
  if (DstReg == SrcReg) {
    unsigned ATReg = getATReg(Inst.getLoc());
    if (!ATReg)
      return true;
    ImmReg = ATReg;
  }
 
  if (loadImmediate(ImmValue, ImmReg, Mips::NoRegister, isInt<32>(ImmValue),
                    false, IDLoc, Out, STI))
    return true;
 
  // $SrcReg > $ImmReg is equal to $ImmReg < $SrcReg
  TOut.emitRRR(OpCode, DstReg, ImmReg, SrcReg, IDLoc, STI);
 
  return false;
}
 
bool MipsAsmParser::expandSle(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                              const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
 
  assert(Inst.getNumOperands() == 3 && "Invalid operand count");
  assert(Inst.getOperand(0).isReg() &&
         Inst.getOperand(1).isReg() &&
         Inst.getOperand(2).isReg() && "Invalid instruction operand.");
 
  unsigned DstReg = Inst.getOperand(0).getReg();
  unsigned SrcReg = Inst.getOperand(1).getReg();
  unsigned OpReg = Inst.getOperand(2).getReg();
  unsigned OpCode;
 
  warnIfNoMacro(IDLoc);
 
  switch (Inst.getOpcode()) {
  case Mips::SLE:
    OpCode = Mips::SLT;
    break;
  case Mips::SLEU:
    OpCode = Mips::SLTu;
    break;
  default:
    llvm_unreachable("unexpected 'sge' opcode");
  }
 
  // $SrcReg <= $OpReg is equal to (not ($OpReg < $SrcReg))
  TOut.emitRRR(OpCode, DstReg, OpReg, SrcReg, IDLoc, STI);
  TOut.emitRRI(Mips::XORi, DstReg, DstReg, 1, IDLoc, STI);
 
  return false;
}
 
bool MipsAsmParser::expandSleImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                 const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
 
  assert(Inst.getNumOperands() == 3 && "Invalid operand count");
  assert(Inst.getOperand(0).isReg() &&
         Inst.getOperand(1).isReg() &&
         Inst.getOperand(2).isImm() && "Invalid instruction operand.");
 
  unsigned DstReg = Inst.getOperand(0).getReg();
  unsigned SrcReg = Inst.getOperand(1).getReg();
  int64_t ImmValue = Inst.getOperand(2).getImm();
  unsigned OpRegCode;
 
  warnIfNoMacro(IDLoc);
 
  switch (Inst.getOpcode()) {
  case Mips::SLEImm:
  case Mips::SLEImm64:
    OpRegCode = Mips::SLT;
    break;
  case Mips::SLEUImm:
  case Mips::SLEUImm64:
    OpRegCode = Mips::SLTu;
    break;
  default:
    llvm_unreachable("unexpected 'sge' opcode with immediate");
  }
 
  // $SrcReg <= Imm is equal to (not (Imm < $SrcReg))
  unsigned ImmReg = DstReg;
  if (DstReg == SrcReg) {
    unsigned ATReg = getATReg(Inst.getLoc());
    if (!ATReg)
      return true;
    ImmReg = ATReg;
  }
 
  if (loadImmediate(ImmValue, ImmReg, Mips::NoRegister, isInt<32>(ImmValue),
                    false, IDLoc, Out, STI))
    return true;
 
  TOut.emitRRR(OpRegCode, DstReg, ImmReg, SrcReg, IDLoc, STI);
  TOut.emitRRI(Mips::XORi, DstReg, DstReg, 1, IDLoc, STI);
 
  return false;
}
 
bool MipsAsmParser::expandAliasImmediate(MCInst &Inst, SMLoc IDLoc,
                                         MCStreamer &Out,
                                         const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
 
  assert(Inst.getNumOperands() == 3 && "Invalid operand count");
  assert(Inst.getOperand(0).isReg() &&
         Inst.getOperand(1).isReg() &&
         Inst.getOperand(2).isImm() && "Invalid instruction operand.");
 
  unsigned ATReg = Mips::NoRegister;
  unsigned FinalDstReg = Mips::NoRegister;
  unsigned DstReg = Inst.getOperand(0).getReg();
  unsigned SrcReg = Inst.getOperand(1).getReg();
  int64_t ImmValue = Inst.getOperand(2).getImm();
 
  bool Is32Bit = isInt<32>(ImmValue) || (!isGP64bit() && isUInt<32>(ImmValue));
 
  unsigned FinalOpcode = Inst.getOpcode();
 
  if (DstReg == SrcReg) {
    ATReg = getATReg(Inst.getLoc());
    if (!ATReg)
      return true;
    FinalDstReg = DstReg;
    DstReg = ATReg;
  }
 
  if (!loadImmediate(ImmValue, DstReg, Mips::NoRegister, Is32Bit, false,
                     Inst.getLoc(), Out, STI)) {
    switch (FinalOpcode) {
    default:
      llvm_unreachable("unimplemented expansion");
    case Mips::ADDi:
      FinalOpcode = Mips::ADD;
      break;
    case Mips::ADDiu:
      FinalOpcode = Mips::ADDu;
      break;
    case Mips::ANDi:
      FinalOpcode = Mips::AND;
      break;
    case Mips::NORImm:
      FinalOpcode = Mips::NOR;
      break;
    case Mips::ORi:
      FinalOpcode = Mips::OR;
      break;
    case Mips::SLTi:
      FinalOpcode = Mips::SLT;
      break;
    case Mips::SLTiu:
      FinalOpcode = Mips::SLTu;
      break;
    case Mips::XORi:
      FinalOpcode = Mips::XOR;
      break;
    case Mips::ADDi_MM:
      FinalOpcode = Mips::ADD_MM;
      break;
    case Mips::ADDiu_MM:
      FinalOpcode = Mips::ADDu_MM;
      break;
    case Mips::ANDi_MM:
      FinalOpcode = Mips::AND_MM;
      break;
    case Mips::ORi_MM:
      FinalOpcode = Mips::OR_MM;
      break;
    case Mips::SLTi_MM:
      FinalOpcode = Mips::SLT_MM;
      break;
    case Mips::SLTiu_MM:
      FinalOpcode = Mips::SLTu_MM;
      break;
    case Mips::XORi_MM:
      FinalOpcode = Mips::XOR_MM;
      break;
    case Mips::ANDi64:
      FinalOpcode = Mips::AND64;
      break;
    case Mips::NORImm64:
      FinalOpcode = Mips::NOR64;
      break;
    case Mips::ORi64:
      FinalOpcode = Mips::OR64;
      break;
    case Mips::SLTImm64:
      FinalOpcode = Mips::SLT64;
      break;
    case Mips::SLTUImm64:
      FinalOpcode = Mips::SLTu64;
      break;
    case Mips::XORi64:
      FinalOpcode = Mips::XOR64;
      break;
    }
 
    if (FinalDstReg == Mips::NoRegister)
      TOut.emitRRR(FinalOpcode, DstReg, DstReg, SrcReg, IDLoc, STI);
    else
      TOut.emitRRR(FinalOpcode, FinalDstReg, FinalDstReg, DstReg, IDLoc, STI);
    return false;
  }
  return true;
}
 
bool MipsAsmParser::expandRotation(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                   const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
  unsigned ATReg = Mips::NoRegister;
  unsigned DReg = Inst.getOperand(0).getReg();
  unsigned SReg = Inst.getOperand(1).getReg();
  unsigned TReg = Inst.getOperand(2).getReg();
  unsigned TmpReg = DReg;
 
  unsigned FirstShift = Mips::NOP;
  unsigned SecondShift = Mips::NOP;
 
  if (hasMips32r2()) {
    if (DReg == SReg) {
      TmpReg = getATReg(Inst.getLoc());
      if (!TmpReg)
        return true;
    }
 
    if (Inst.getOpcode() == Mips::ROL) {
      TOut.emitRRR(Mips::SUBu, TmpReg, Mips::ZERO, TReg, Inst.getLoc(), STI);
      TOut.emitRRR(Mips::ROTRV, DReg, SReg, TmpReg, Inst.getLoc(), STI);
      return false;
    }
 
    if (Inst.getOpcode() == Mips::ROR) {
      TOut.emitRRR(Mips::ROTRV, DReg, SReg, TReg, Inst.getLoc(), STI);
      return false;
    }
 
    return true;
  }
 
  if (hasMips32()) {
    switch (Inst.getOpcode()) {
    default:
      llvm_unreachable("unexpected instruction opcode");
    case Mips::ROL:
      FirstShift = Mips::SRLV;
      SecondShift = Mips::SLLV;
      break;
    case Mips::ROR:
      FirstShift = Mips::SLLV;
      SecondShift = Mips::SRLV;
      break;
    }
 
    ATReg = getATReg(Inst.getLoc());
    if (!ATReg)
      return true;
 
    TOut.emitRRR(Mips::SUBu, ATReg, Mips::ZERO, TReg, Inst.getLoc(), STI);
    TOut.emitRRR(FirstShift, ATReg, SReg, ATReg, Inst.getLoc(), STI);
    TOut.emitRRR(SecondShift, DReg, SReg, TReg, Inst.getLoc(), STI);
    TOut.emitRRR(Mips::OR, DReg, DReg, ATReg, Inst.getLoc(), STI);
 
    return false;
  }
 
  return true;
}
 
bool MipsAsmParser::expandRotationImm(MCInst &Inst, SMLoc IDLoc,
                                      MCStreamer &Out,
                                      const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
  unsigned ATReg = Mips::NoRegister;
  unsigned DReg = Inst.getOperand(0).getReg();
  unsigned SReg = Inst.getOperand(1).getReg();
  int64_t ImmValue = Inst.getOperand(2).getImm();
 
  unsigned FirstShift = Mips::NOP;
  unsigned SecondShift = Mips::NOP;
 
  if (hasMips32r2()) {
    if (Inst.getOpcode() == Mips::ROLImm) {
      uint64_t MaxShift = 32;
      uint64_t ShiftValue = ImmValue;
      if (ImmValue != 0)
        ShiftValue = MaxShift - ImmValue;
      TOut.emitRRI(Mips::ROTR, DReg, SReg, ShiftValue, Inst.getLoc(), STI);
      return false;
    }
 
    if (Inst.getOpcode() == Mips::RORImm) {
      TOut.emitRRI(Mips::ROTR, DReg, SReg, ImmValue, Inst.getLoc(), STI);
      return false;
    }
 
    return true;
  }
 
  if (hasMips32()) {
    if (ImmValue == 0) {
      TOut.emitRRI(Mips::SRL, DReg, SReg, 0, Inst.getLoc(), STI);
      return false;
    }
 
    switch (Inst.getOpcode()) {
    default:
      llvm_unreachable("unexpected instruction opcode");
    case Mips::ROLImm:
      FirstShift = Mips::SLL;
      SecondShift = Mips::SRL;
      break;
    case Mips::RORImm:
      FirstShift = Mips::SRL;
      SecondShift = Mips::SLL;
      break;
    }
 
    ATReg = getATReg(Inst.getLoc());
    if (!ATReg)
      return true;
 
    TOut.emitRRI(FirstShift, ATReg, SReg, ImmValue, Inst.getLoc(), STI);
    TOut.emitRRI(SecondShift, DReg, SReg, 32 - ImmValue, Inst.getLoc(), STI);
    TOut.emitRRR(Mips::OR, DReg, DReg, ATReg, Inst.getLoc(), STI);
 
    return false;
  }
 
  return true;
}
 
bool MipsAsmParser::expandDRotation(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                    const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
  unsigned ATReg = Mips::NoRegister;
  unsigned DReg = Inst.getOperand(0).getReg();
  unsigned SReg = Inst.getOperand(1).getReg();
  unsigned TReg = Inst.getOperand(2).getReg();
  unsigned TmpReg = DReg;
 
  unsigned FirstShift = Mips::NOP;
  unsigned SecondShift = Mips::NOP;
 
  if (hasMips64r2()) {
    if (TmpReg == SReg) {
      TmpReg = getATReg(Inst.getLoc());
      if (!TmpReg)
        return true;
    }
 
    if (Inst.getOpcode() == Mips::DROL) {
      TOut.emitRRR(Mips::DSUBu, TmpReg, Mips::ZERO, TReg, Inst.getLoc(), STI);
      TOut.emitRRR(Mips::DROTRV, DReg, SReg, TmpReg, Inst.getLoc(), STI);
      return false;
    }
 
    if (Inst.getOpcode() == Mips::DROR) {
      TOut.emitRRR(Mips::DROTRV, DReg, SReg, TReg, Inst.getLoc(), STI);
      return false;
    }
 
    return true;
  }
 
  if (hasMips64()) {
    switch (Inst.getOpcode()) {
    default:
      llvm_unreachable("unexpected instruction opcode");
    case Mips::DROL:
      FirstShift = Mips::DSRLV;
      SecondShift = Mips::DSLLV;
      break;
    case Mips::DROR:
      FirstShift = Mips::DSLLV;
      SecondShift = Mips::DSRLV;
      break;
    }
 
    ATReg = getATReg(Inst.getLoc());
    if (!ATReg)
      return true;
 
    TOut.emitRRR(Mips::DSUBu, ATReg, Mips::ZERO, TReg, Inst.getLoc(), STI);
    TOut.emitRRR(FirstShift, ATReg, SReg, ATReg, Inst.getLoc(), STI);
    TOut.emitRRR(SecondShift, DReg, SReg, TReg, Inst.getLoc(), STI);
    TOut.emitRRR(Mips::OR, DReg, DReg, ATReg, Inst.getLoc(), STI);
 
    return false;
  }
 
  return true;
}
 
bool MipsAsmParser::expandDRotationImm(MCInst &Inst, SMLoc IDLoc,
                                       MCStreamer &Out,
                                       const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
  unsigned ATReg = Mips::NoRegister;
  unsigned DReg = Inst.getOperand(0).getReg();
  unsigned SReg = Inst.getOperand(1).getReg();
  int64_t ImmValue = Inst.getOperand(2).getImm() % 64;
 
  unsigned FirstShift = Mips::NOP;
  unsigned SecondShift = Mips::NOP;
 
  MCInst TmpInst;
 
  if (hasMips64r2()) {
    unsigned FinalOpcode = Mips::NOP;
    if (ImmValue == 0)
      FinalOpcode = Mips::DROTR;
    else if (ImmValue % 32 == 0)
      FinalOpcode = Mips::DROTR32;
    else if ((ImmValue >= 1) && (ImmValue <= 32)) {
      if (Inst.getOpcode() == Mips::DROLImm)
        FinalOpcode = Mips::DROTR32;
      else
        FinalOpcode = Mips::DROTR;
    } else if (ImmValue >= 33) {
      if (Inst.getOpcode() == Mips::DROLImm)
        FinalOpcode = Mips::DROTR;
      else
        FinalOpcode = Mips::DROTR32;
    }
 
    uint64_t ShiftValue = ImmValue % 32;
    if (Inst.getOpcode() == Mips::DROLImm)
      ShiftValue = (32 - ImmValue % 32) % 32;
 
    TOut.emitRRI(FinalOpcode, DReg, SReg, ShiftValue, Inst.getLoc(), STI);
 
    return false;
  }
 
  if (hasMips64()) {
    if (ImmValue == 0) {
      TOut.emitRRI(Mips::DSRL, DReg, SReg, 0, Inst.getLoc(), STI);
      return false;
    }
 
    switch (Inst.getOpcode()) {
    default:
      llvm_unreachable("unexpected instruction opcode");
    case Mips::DROLImm:
      if ((ImmValue >= 1) && (ImmValue <= 31)) {
        FirstShift = Mips::DSLL;
        SecondShift = Mips::DSRL32;
      }
      if (ImmValue == 32) {
        FirstShift = Mips::DSLL32;
        SecondShift = Mips::DSRL32;
      }
      if ((ImmValue >= 33) && (ImmValue <= 63)) {
        FirstShift = Mips::DSLL32;
        SecondShift = Mips::DSRL;
      }
      break;
    case Mips::DRORImm:
      if ((ImmValue >= 1) && (ImmValue <= 31)) {
        FirstShift = Mips::DSRL;
        SecondShift = Mips::DSLL32;
      }
      if (ImmValue == 32) {
        FirstShift = Mips::DSRL32;
        SecondShift = Mips::DSLL32;
      }
      if ((ImmValue >= 33) && (ImmValue <= 63)) {
        FirstShift = Mips::DSRL32;
        SecondShift = Mips::DSLL;
      }
      break;
    }
 
    ATReg = getATReg(Inst.getLoc());
    if (!ATReg)
      return true;
 
    TOut.emitRRI(FirstShift, ATReg, SReg, ImmValue % 32, Inst.getLoc(), STI);
    TOut.emitRRI(SecondShift, DReg, SReg, (32 - ImmValue % 32) % 32,
                 Inst.getLoc(), STI);
    TOut.emitRRR(Mips::OR, DReg, DReg, ATReg, Inst.getLoc(), STI);
 
    return false;
  }
 
  return true;
}
 
bool MipsAsmParser::expandAbs(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                              const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
  unsigned FirstRegOp = Inst.getOperand(0).getReg();
  unsigned SecondRegOp = Inst.getOperand(1).getReg();
 
  TOut.emitRI(Mips::BGEZ, SecondRegOp, 8, IDLoc, STI);
  if (FirstRegOp != SecondRegOp)
    TOut.emitRRR(Mips::ADDu, FirstRegOp, SecondRegOp, Mips::ZERO, IDLoc, STI);
  else
    TOut.emitEmptyDelaySlot(false, IDLoc, STI);
  TOut.emitRRR(Mips::SUB, FirstRegOp, Mips::ZERO, SecondRegOp, IDLoc, STI);
 
  return false;
}
 
bool MipsAsmParser::expandMulImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                 const MCSubtargetInfo *STI) {
  MipsTargetStreamer &TOut = getTargetStreamer();
  unsigned ATReg = Mips::NoRegister;
  unsigned DstReg = Inst.getOperand(0).getReg();
  unsigned SrcReg = Inst.getOperand(1).getReg();
  int32_t ImmValue = Inst.getOperand(2).getImm();
 
  ATReg = getATReg(IDLoc);
  if (!ATReg)
    return true;
 
  loadImmediate(ImmValue, ATReg, Mips::NoRegister, true, false, IDLoc, Out,
                STI);
 
  TOut.emitRR(Inst.getOpcode() == Mips::MULImmMacro ? Mips::MULT : Mips::DMULT,
              SrcReg, ATReg, IDLoc, STI);
 
  TOut.emitR(Mips::MFLO, DstReg, IDLoc, STI);
 
  return