doxygen/AArch64MCCodeEmitter_8cpp_source.html

//=- AArch64/AArch64MCCodeEmitter.cpp - Convert AArch64 code to machine code-=//

//

// 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

//

//===----------------------------------------------------------------------===//

//

// This file implements the AArch64MCCodeEmitter class.

//

//===----------------------------------------------------------------------===//


#include "MCTargetDesc/AArch64AddressingModes.h"

#include "MCTargetDesc/AArch64FixupKinds.h"

#include "MCTargetDesc/AArch64MCExpr.h"

#include "llvm/ADT/SmallVector.h"

#include "llvm/ADT/Statistic.h"

#include "llvm/BinaryFormat/ELF.h"

#include "llvm/MC/MCCodeEmitter.h"

#include "llvm/MC/MCContext.h"

#include "llvm/MC/MCFixup.h"

#include "llvm/MC/MCInst.h"

#include "llvm/MC/MCInstrInfo.h"

#include "llvm/MC/MCRegisterInfo.h"

#include "llvm/MC/MCSubtargetInfo.h"

#include "llvm/Support/Casting.h"

#include "llvm/Support/EndianStream.h"

#include "llvm/Support/ErrorHandling.h"

#include <cassert>

#include <cstdint>


using namespace llvm;


#define DEBUG_TYPE "mccodeemitter"


STATISTIC(MCNumEmitted, "Number of MC instructions emitted.");

STATISTIC(MCNumFixups, "Number of MC fixups created.");


namespace {


class AArch64MCCodeEmitter : public MCCodeEmitter {

  MCContext &Ctx;


public:

  AArch64MCCodeEmitter(const MCInstrInfo &, MCContext &ctx) : Ctx(ctx) {}

  AArch64MCCodeEmitter(const AArch64MCCodeEmitter &) = delete;

  void operator=(const AArch64MCCodeEmitter &) = delete;

  ~AArch64MCCodeEmitter() override = default;


  // getBinaryCodeForInstr - TableGen'erated function for getting the

  // binary encoding for an instruction.

  uint64_t getBinaryCodeForInstr(const MCInst &MI,

                                 SmallVectorImpl<MCFixup> &Fixups,

                                 const MCSubtargetInfo &STI) const;


  /// getMachineOpValue - Return binary encoding of operand. If the machine

  /// operand requires relocation, record the relocation and return zero.

  unsigned getMachineOpValue(const MCInst &MI, const MCOperand &MO,

                             SmallVectorImpl<MCFixup> &Fixups,

                             const MCSubtargetInfo &STI) const;


  /// getLdStUImm12OpValue - Return encoding info for 12-bit unsigned immediate

  /// attached to a load, store or prfm instruction. If operand requires a

  /// relocation, record it and return zero in that part of the encoding.

  template <uint32_t FixupKind>

  uint32_t getLdStUImm12OpValue(const MCInst &MI, unsigned OpIdx,

                                SmallVectorImpl<MCFixup> &Fixups,

                                const MCSubtargetInfo &STI) const;


  /// getAdrLabelOpValue - Return encoding info for 21-bit immediate ADR label

  /// target.

  uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,

                              SmallVectorImpl<MCFixup> &Fixups,

                              const MCSubtargetInfo &STI) const;


  /// getAddSubImmOpValue - Return encoding for the 12-bit immediate value and

  /// the 2-bit shift field.

  uint32_t getAddSubImmOpValue(const MCInst &MI, unsigned OpIdx,

                               SmallVectorImpl<MCFixup> &Fixups,

                               const MCSubtargetInfo &STI) const;


  /// getCondBranchTargetOpValue - Return the encoded value for a conditional

  /// branch target.

  uint32_t getCondBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,

                                      SmallVectorImpl<MCFixup> &Fixups,

                                      const MCSubtargetInfo &STI) const;


  /// getCondCompBranchTargetOpValue - Return the encoded value for a

  /// conditional compare-and-branch target.

  uint32_t getCondCompBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,

                                          SmallVectorImpl<MCFixup> &Fixups,

                                          const MCSubtargetInfo &STI) const;


  /// getPAuthPCRelOpValue - Return the encoded value for a pointer

  /// authentication pc-relative operand.

  uint32_t getPAuthPCRelOpValue(const MCInst &MI, unsigned OpIdx,

                                SmallVectorImpl<MCFixup> &Fixups,

                                const MCSubtargetInfo &STI) const;


  /// getLoadLiteralOpValue - Return the encoded value for a load-literal

  /// pc-relative address.

  uint32_t getLoadLiteralOpValue(const MCInst &MI, unsigned OpIdx,

                                 SmallVectorImpl<MCFixup> &Fixups,

                                 const MCSubtargetInfo &STI) const;


  /// getMemExtendOpValue - Return the encoded value for a reg-extend load/store

  /// instruction: bit 0 is whether a shift is present, bit 1 is whether the

  /// operation is a sign extend (as opposed to a zero extend).

  uint32_t getMemExtendOpValue(const MCInst &MI, unsigned OpIdx,

                               SmallVectorImpl<MCFixup> &Fixups,

                               const MCSubtargetInfo &STI) const;


  /// getTestBranchTargetOpValue - Return the encoded value for a test-bit-and-

  /// branch target.

  uint32_t getTestBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,

                                      SmallVectorImpl<MCFixup> &Fixups,

                                      const MCSubtargetInfo &STI) const;


  /// getBranchTargetOpValue - Return the encoded value for an unconditional

  /// branch target.

  uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,

                                  SmallVectorImpl<MCFixup> &Fixups,

                                  const MCSubtargetInfo &STI) const;


  /// getMoveWideImmOpValue - Return the encoded value for the immediate operand

  /// of a MOVZ or MOVK instruction.

  uint32_t getMoveWideImmOpValue(const MCInst &MI, unsigned OpIdx,

                                 SmallVectorImpl<MCFixup> &Fixups,

                                 const MCSubtargetInfo &STI) const;


  /// getVecShifterOpValue - Return the encoded value for the vector shifter.

  uint32_t getVecShifterOpValue(const MCInst &MI, unsigned OpIdx,

                                SmallVectorImpl<MCFixup> &Fixups,

                                const MCSubtargetInfo &STI) const;


  /// getMoveVecShifterOpValue - Return the encoded value for the vector move

  /// shifter (MSL).

  uint32_t getMoveVecShifterOpValue(const MCInst &MI, unsigned OpIdx,

                                    SmallVectorImpl<MCFixup> &Fixups,

                                    const MCSubtargetInfo &STI) const;


  /// getFixedPointScaleOpValue - Return the encoded value for the

  // FP-to-fixed-point scale factor.

  uint32_t getFixedPointScaleOpValue(const MCInst &MI, unsigned OpIdx,

                                     SmallVectorImpl<MCFixup> &Fixups,

                                     const MCSubtargetInfo &STI) const;


  uint32_t getVecShiftR64OpValue(const MCInst &MI, unsigned OpIdx,

                                 SmallVectorImpl<MCFixup> &Fixups,

                                 const MCSubtargetInfo &STI) const;

  uint32_t getVecShiftR32OpValue(const MCInst &MI, unsigned OpIdx,

                                 SmallVectorImpl<MCFixup> &Fixups,

                                 const MCSubtargetInfo &STI) const;

  uint32_t getVecShiftR16OpValue(const MCInst &MI, unsigned OpIdx,

                                 SmallVectorImpl<MCFixup> &Fixups,

                                 const MCSubtargetInfo &STI) const;

  uint32_t getVecShiftR8OpValue(const MCInst &MI, unsigned OpIdx,

                                SmallVectorImpl<MCFixup> &Fixups,

                                const MCSubtargetInfo &STI) const;

  uint32_t getVecShiftL64OpValue(const MCInst &MI, unsigned OpIdx,

                                 SmallVectorImpl<MCFixup> &Fixups,

                                 const MCSubtargetInfo &STI) const;

  uint32_t getVecShiftL32OpValue(const MCInst &MI, unsigned OpIdx,

                                 SmallVectorImpl<MCFixup> &Fixups,

                                 const MCSubtargetInfo &STI) const;

  uint32_t getVecShiftL16OpValue(const MCInst &MI, unsigned OpIdx,

                                 SmallVectorImpl<MCFixup> &Fixups,

                                 const MCSubtargetInfo &STI) const;

  uint32_t getVecShiftL8OpValue(const MCInst &MI, unsigned OpIdx,

                                SmallVectorImpl<MCFixup> &Fixups,

                                const MCSubtargetInfo &STI) const;


  uint32_t getImm8OptLsl(const MCInst &MI, unsigned OpIdx,

                         SmallVectorImpl<MCFixup> &Fixups,

                         const MCSubtargetInfo &STI) const;

  uint32_t getSVEIncDecImm(const MCInst &MI, unsigned OpIdx,

                           SmallVectorImpl<MCFixup> &Fixups,

                           const MCSubtargetInfo &STI) const;


  unsigned fixMOVZ(const MCInst &MI, unsigned EncodedValue,

                   const MCSubtargetInfo &STI) const;


  void encodeInstruction(const MCInst &MI, SmallVectorImpl<char> &CB,

                         SmallVectorImpl<MCFixup> &Fixups,

                         const MCSubtargetInfo &STI) const override;


  unsigned fixMulHigh(const MCInst &MI, unsigned EncodedValue,

                      const MCSubtargetInfo &STI) const;


  template<int hasRs, int hasRt2> unsigned

  fixLoadStoreExclusive(const MCInst &MI, unsigned EncodedValue,

                        const MCSubtargetInfo &STI) const;


  unsigned fixOneOperandFPComparison(const MCInst &MI, unsigned EncodedValue,

                                     const MCSubtargetInfo &STI) const;


  template <unsigned Multiple, unsigned Min, unsigned Max>

  uint32_t EncodeRegMul_MinMax(const MCInst &MI, unsigned OpIdx,

                               SmallVectorImpl<MCFixup> &Fixups,

                               const MCSubtargetInfo &STI) const;

  uint32_t EncodeZK(const MCInst &MI, unsigned OpIdx,

                    SmallVectorImpl<MCFixup> &Fixups,

                    const MCSubtargetInfo &STI) const;

  uint32_t EncodePNR_p8to15(const MCInst &MI, unsigned OpIdx,

                            SmallVectorImpl<MCFixup> &Fixups,

                            const MCSubtargetInfo &STI) const;


  uint32_t EncodeZPR2StridedRegisterClass(const MCInst &MI, unsigned OpIdx,

                                          SmallVectorImpl<MCFixup> &Fixups,

                                          const MCSubtargetInfo &STI) const;

  uint32_t EncodeZPR4StridedRegisterClass(const MCInst &MI, unsigned OpIdx,

                                          SmallVectorImpl<MCFixup> &Fixups,

                                          const MCSubtargetInfo &STI) const;


  uint32_t EncodeMatrixTileListRegisterClass(const MCInst &MI, unsigned OpIdx,

                                             SmallVectorImpl<MCFixup> &Fixups,

                                             const MCSubtargetInfo &STI) const;

  template <unsigned BaseReg>

  uint32_t encodeMatrixIndexGPR32(const MCInst &MI, unsigned OpIdx,

                                  SmallVectorImpl<MCFixup> &Fixups,

                                  const MCSubtargetInfo &STI) const;

};


} // end anonymous namespace


/// getMachineOpValue - Return binary encoding of operand. If the machine

/// operand requires relocation, record the relocation and return zero.

unsigned

AArch64MCCodeEmitter::getMachineOpValue(const MCInst &MI, const MCOperand &MO,

                                        SmallVectorImpl<MCFixup> &Fixups,

                                        const MCSubtargetInfo &STI) const {

  if (MO.isReg())

    return Ctx.getRegisterInfo()->getEncodingValue(MO.getReg());


  assert(MO.isImm() && "did not expect relocated expression");

  return static_cast<unsigned>(MO.getImm());

}


template<unsigned FixupKind> uint32_t

AArch64MCCodeEmitter::getLdStUImm12OpValue(const MCInst &MI, unsigned OpIdx,

                                           SmallVectorImpl<MCFixup> &Fixups,

                                           const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);

  uint32_t ImmVal = 0;


  if (MO.isImm())

    ImmVal = static_cast<uint32_t>(MO.getImm());

  else {

    assert(MO.isExpr() && "unable to encode load/store imm operand");

    MCFixupKind Kind = MCFixupKind(FixupKind);

    Fixups.push_back(MCFixup::create(0, MO.getExpr(), Kind, MI.getLoc()));

    ++MCNumFixups;

  }


  return ImmVal;

}


/// getAdrLabelOpValue - Return encoding info for 21-bit immediate ADR label

/// target.

uint32_t

AArch64MCCodeEmitter::getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,

                                         SmallVectorImpl<MCFixup> &Fixups,

                                         const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);


  // If the destination is an immediate, we have nothing to do.

  if (MO.isImm())

    return MO.getImm();

  assert(MO.isExpr() && "Unexpected target type!");

  const MCExpr *Expr = MO.getExpr();


  MCFixupKind Kind = MI.getOpcode() == AArch64::ADR

                         ? MCFixupKind(AArch64::fixup_aarch64_pcrel_adr_imm21)

                         : MCFixupKind(AArch64::fixup_aarch64_pcrel_adrp_imm21);

  Fixups.push_back(MCFixup::create(0, Expr, Kind, MI.getLoc()));


  MCNumFixups += 1;


  // All of the information is in the fixup.

  return 0;

}


/// getAddSubImmOpValue - Return encoding for the 12-bit immediate value and

/// the 2-bit shift field.  The shift field is stored in bits 13-14 of the

/// return value.

uint32_t

AArch64MCCodeEmitter::getAddSubImmOpValue(const MCInst &MI, unsigned OpIdx,

                                          SmallVectorImpl<MCFixup> &Fixups,

                                          const MCSubtargetInfo &STI) const {

  // Suboperands are [imm, shifter].

  const MCOperand &MO = MI.getOperand(OpIdx);

  const MCOperand &MO1 = MI.getOperand(OpIdx + 1);

  assert(AArch64_AM::getShiftType(MO1.getImm()) == AArch64_AM::LSL &&

         "unexpected shift type for add/sub immediate");

  unsigned ShiftVal = AArch64_AM::getShiftValue(MO1.getImm());

  assert((ShiftVal == 0 || ShiftVal == 12) &&

         "unexpected shift value for add/sub immediate");

  if (MO.isImm())

    return MO.getImm() | (ShiftVal == 0 ? 0 : (1 << ShiftVal));

  assert(MO.isExpr() && "Unable to encode MCOperand!");

  const MCExpr *Expr = MO.getExpr();


  // Encode the 12 bits of the fixup.

  MCFixupKind Kind = MCFixupKind(AArch64::fixup_aarch64_add_imm12);

  Fixups.push_back(MCFixup::create(0, Expr, Kind, MI.getLoc()));


  ++MCNumFixups;


  // Set the shift bit of the add instruction for relocation types

  // R_AARCH64_TLSLE_ADD_TPREL_HI12 and R_AARCH64_TLSLD_ADD_DTPREL_HI12.

  if (const AArch64MCExpr *A64E = dyn_cast<AArch64MCExpr>(Expr)) {

    AArch64MCExpr::VariantKind RefKind = A64E->getKind();

    if (RefKind == AArch64MCExpr::VK_TPREL_HI12 ||

        RefKind == AArch64MCExpr::VK_DTPREL_HI12 ||

        RefKind == AArch64MCExpr::VK_SECREL_HI12)

      ShiftVal = 12;

  }

  return ShiftVal == 0 ? 0 : (1 << ShiftVal);

}


/// getCondBranchTargetOpValue - Return the encoded value for a conditional

/// branch target.

uint32_t AArch64MCCodeEmitter::getCondBranchTargetOpValue(

    const MCInst &MI, unsigned OpIdx, SmallVectorImpl<MCFixup> &Fixups,

    const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);


  // If the destination is an immediate, we have nothing to do.

  if (MO.isImm())

    return MO.getImm();

  assert(MO.isExpr() && "Unexpected target type!");


  MCFixupKind Kind = MCFixupKind(AArch64::fixup_aarch64_pcrel_branch19);

  Fixups.push_back(MCFixup::create(0, MO.getExpr(), Kind, MI.getLoc()));


  ++MCNumFixups;


  // All of the information is in the fixup.

  return 0;

}


/// getCondCompBranchTargetOpValue - Return the encoded value for a conditional

/// compare-and-branch target.

uint32_t AArch64MCCodeEmitter::getCondCompBranchTargetOpValue(

    const MCInst &MI, unsigned OpIdx, SmallVectorImpl<MCFixup> &Fixups,

    const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);


  // If the destination is an immediate, we have nothing to do.

  if (MO.isImm())

    return MO.getImm();

  assert(MO.isExpr() && "Unexpected target type!");


  MCFixupKind Kind = MCFixupKind(AArch64::fixup_aarch64_pcrel_branch9);

  Fixups.push_back(MCFixup::create(0, MO.getExpr(), Kind, MI.getLoc()));


  ++MCNumFixups;


  // All of the information is in the fixup.

  return 0;

}


/// getPAuthPCRelOpValue - Return the encoded value for a pointer

/// authentication pc-relative operand.

uint32_t

AArch64MCCodeEmitter::getPAuthPCRelOpValue(const MCInst &MI, unsigned OpIdx,

                                           SmallVectorImpl<MCFixup> &Fixups,

                                           const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);


  // If the destination is an immediate, invert sign as it's a negative value

  // that should be encoded as unsigned

  if (MO.isImm())

    return -(MO.getImm());

  assert(MO.isExpr() && "Unexpected target type!");


  MCFixupKind Kind = MCFixupKind(AArch64::fixup_aarch64_pcrel_branch16);

  Fixups.push_back(MCFixup::create(0, MO.getExpr(), Kind, MI.getLoc()));


  ++MCNumFixups;


  // All of the information is in the fixup.

  return 0;

}


/// getLoadLiteralOpValue - Return the encoded value for a load-literal

/// pc-relative address.

uint32_t

AArch64MCCodeEmitter::getLoadLiteralOpValue(const MCInst &MI, unsigned OpIdx,

                                            SmallVectorImpl<MCFixup> &Fixups,

                                            const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);


  // If the destination is an immediate, we have nothing to do.

  if (MO.isImm())

    return MO.getImm();

  assert(MO.isExpr() && "Unexpected target type!");


  MCFixupKind Kind = MCFixupKind(AArch64::fixup_aarch64_ldr_pcrel_imm19);

  Fixups.push_back(MCFixup::create(0, MO.getExpr(), Kind, MI.getLoc()));


  ++MCNumFixups;


  // All of the information is in the fixup.

  return 0;

}


uint32_t

AArch64MCCodeEmitter::getMemExtendOpValue(const MCInst &MI, unsigned OpIdx,

                                          SmallVectorImpl<MCFixup> &Fixups,

                                          const MCSubtargetInfo &STI) const {

  unsigned SignExtend = MI.getOperand(OpIdx).getImm();

  unsigned DoShift = MI.getOperand(OpIdx + 1).getImm();

  return (SignExtend << 1) | DoShift;

}


uint32_t

AArch64MCCodeEmitter::getMoveWideImmOpValue(const MCInst &MI, unsigned OpIdx,

                                            SmallVectorImpl<MCFixup> &Fixups,

                                            const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);


  if (MO.isImm())

    return MO.getImm();

  assert(MO.isExpr() && "Unexpected movz/movk immediate");


  Fixups.push_back(MCFixup::create(

      0, MO.getExpr(), MCFixupKind(AArch64::fixup_aarch64_movw), MI.getLoc()));


  ++MCNumFixups;


  return 0;

}


/// getTestBranchTargetOpValue - Return the encoded value for a test-bit-and-

/// branch target.

uint32_t AArch64MCCodeEmitter::getTestBranchTargetOpValue(

    const MCInst &MI, unsigned OpIdx, SmallVectorImpl<MCFixup> &Fixups,

    const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);


  // If the destination is an immediate, we have nothing to do.

  if (MO.isImm())

    return MO.getImm();

  assert(MO.isExpr() && "Unexpected ADR target type!");


  MCFixupKind Kind = MCFixupKind(AArch64::fixup_aarch64_pcrel_branch14);

  Fixups.push_back(MCFixup::create(0, MO.getExpr(), Kind, MI.getLoc()));


  ++MCNumFixups;


  // All of the information is in the fixup.

  return 0;

}


/// getBranchTargetOpValue - Return the encoded value for an unconditional

/// branch target.

uint32_t

AArch64MCCodeEmitter::getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,

                                             SmallVectorImpl<MCFixup> &Fixups,

                                             const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);


  // If the destination is an immediate, we have nothing to do.

  if (MO.isImm())

    return MO.getImm();

  assert(MO.isExpr() && "Unexpected ADR target type!");


  MCFixupKind Kind = MI.getOpcode() == AArch64::BL

                         ? MCFixupKind(AArch64::fixup_aarch64_pcrel_call26)

                         : MCFixupKind(AArch64::fixup_aarch64_pcrel_branch26);

  Fixups.push_back(MCFixup::create(0, MO.getExpr(), Kind, MI.getLoc()));


  ++MCNumFixups;


  // All of the information is in the fixup.

  return 0;

}


/// getVecShifterOpValue - Return the encoded value for the vector shifter:

///

///   00 -> 0

///   01 -> 8

///   10 -> 16

///   11 -> 24

uint32_t

AArch64MCCodeEmitter::getVecShifterOpValue(const MCInst &MI, unsigned OpIdx,

                                           SmallVectorImpl<MCFixup> &Fixups,

                                           const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);

  assert(MO.isImm() && "Expected an immediate value for the shift amount!");


  switch (MO.getImm()) {

  default:

    break;

  case 0:

    return 0;

  case 8:

    return 1;

  case 16:

    return 2;

  case 24:

    return 3;

  }


  llvm_unreachable("Invalid value for vector shift amount!");

}


/// getFixedPointScaleOpValue - Return the encoded value for the

// FP-to-fixed-point scale factor.

uint32_t AArch64MCCodeEmitter::getFixedPointScaleOpValue(

    const MCInst &MI, unsigned OpIdx, SmallVectorImpl<MCFixup> &Fixups,

    const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);

  assert(MO.isImm() && "Expected an immediate value for the scale amount!");

  return 64 - MO.getImm();

}


uint32_t

AArch64MCCodeEmitter::getVecShiftR64OpValue(const MCInst &MI, unsigned OpIdx,

                                            SmallVectorImpl<MCFixup> &Fixups,

                                            const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);

  assert(MO.isImm() && "Expected an immediate value for the scale amount!");

  return 64 - MO.getImm();

}


uint32_t

AArch64MCCodeEmitter::getVecShiftR32OpValue(const MCInst &MI, unsigned OpIdx,

                                            SmallVectorImpl<MCFixup> &Fixups,

                                            const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);

  assert(MO.isImm() && "Expected an immediate value for the scale amount!");

  return 32 - MO.getImm();

}


uint32_t

AArch64MCCodeEmitter::getVecShiftR16OpValue(const MCInst &MI, unsigned OpIdx,

                                            SmallVectorImpl<MCFixup> &Fixups,

                                            const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);

  assert(MO.isImm() && "Expected an immediate value for the scale amount!");

  return 16 - MO.getImm();

}


uint32_t

AArch64MCCodeEmitter::getVecShiftR8OpValue(const MCInst &MI, unsigned OpIdx,

                                           SmallVectorImpl<MCFixup> &Fixups,

                                           const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);

  assert(MO.isImm() && "Expected an immediate value for the scale amount!");

  return 8 - MO.getImm();

}


uint32_t

AArch64MCCodeEmitter::getVecShiftL64OpValue(const MCInst &MI, unsigned OpIdx,

                                            SmallVectorImpl<MCFixup> &Fixups,

                                            const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);

  assert(MO.isImm() && "Expected an immediate value for the scale amount!");

  return MO.getImm() - 64;

}


uint32_t

AArch64MCCodeEmitter::getVecShiftL32OpValue(const MCInst &MI, unsigned OpIdx,

                                            SmallVectorImpl<MCFixup> &Fixups,

                                            const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);

  assert(MO.isImm() && "Expected an immediate value for the scale amount!");

  return MO.getImm() - 32;

}


uint32_t

AArch64MCCodeEmitter::getVecShiftL16OpValue(const MCInst &MI, unsigned OpIdx,

                                            SmallVectorImpl<MCFixup> &Fixups,

                                            const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);

  assert(MO.isImm() && "Expected an immediate value for the scale amount!");

  return MO.getImm() - 16;

}


uint32_t

AArch64MCCodeEmitter::getVecShiftL8OpValue(const MCInst &MI, unsigned OpIdx,

                                           SmallVectorImpl<MCFixup> &Fixups,

                                           const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);

  assert(MO.isImm() && "Expected an immediate value for the scale amount!");

  return MO.getImm() - 8;

}


template <unsigned Multiple, unsigned Min, unsigned Max>

uint32_t

AArch64MCCodeEmitter::EncodeRegMul_MinMax(const MCInst &MI, unsigned OpIdx,

                                          SmallVectorImpl<MCFixup> &Fixups,

                                          const MCSubtargetInfo &STI) const {

  assert(llvm::isPowerOf2_32(Multiple) && "Multiple is not a power of 2");

  auto RegOpnd = MI.getOperand(OpIdx).getReg();

  unsigned RegVal = Ctx.getRegisterInfo()->getEncodingValue(RegOpnd);

  assert(RegVal >= Min && RegVal <= Max && (RegVal & (Multiple - 1)) == 0);

  return (RegVal - Min) / Multiple;

}


// Zk Is the name of the control vector register Z20-Z23 or Z28-Z31, encoded in

// the "K:Zk" fields. Z20-Z23 = 000, 001,010, 011  and Z28-Z31 = 100, 101, 110,

// 111

uint32_t AArch64MCCodeEmitter::EncodeZK(const MCInst &MI, unsigned OpIdx,

                                        SmallVectorImpl<MCFixup> &Fixups,

                                        const MCSubtargetInfo &STI) const {

  auto RegOpnd = MI.getOperand(OpIdx).getReg();

  unsigned RegVal = Ctx.getRegisterInfo()->getEncodingValue(RegOpnd);


  // ZZ8-Z31 => Reg is in 3..7 (offset 24)

  if (RegOpnd > AArch64::Z27)

    return (RegVal - 24);


  assert((RegOpnd > AArch64::Z19 && RegOpnd < AArch64::Z24) &&

         "Expected ZK in Z20..Z23 or Z28..Z31");

  // Z20-Z23 => Reg is in 0..3 (offset 20)

  return (RegVal - 20);

}


uint32_t

AArch64MCCodeEmitter::EncodePNR_p8to15(const MCInst &MI, unsigned OpIdx,

                                       SmallVectorImpl<MCFixup> &Fixups,

                                       const MCSubtargetInfo &STI) const {

  auto RegOpnd = MI.getOperand(OpIdx).getReg();

  return RegOpnd - AArch64::PN8;

}


uint32_t AArch64MCCodeEmitter::EncodeZPR2StridedRegisterClass(

    const MCInst &MI, unsigned OpIdx, SmallVectorImpl<MCFixup> &Fixups,

    const MCSubtargetInfo &STI) const {

  auto RegOpnd = MI.getOperand(OpIdx).getReg();

  unsigned RegVal = Ctx.getRegisterInfo()->getEncodingValue(RegOpnd);

  unsigned T = (RegVal & 0x10) >> 1;

  unsigned Zt = RegVal & 0x7;

  return T | Zt;

}


uint32_t AArch64MCCodeEmitter::EncodeZPR4StridedRegisterClass(

    const MCInst &MI, unsigned OpIdx, SmallVectorImpl<MCFixup> &Fixups,

    const MCSubtargetInfo &STI) const {

  auto RegOpnd = MI.getOperand(OpIdx).getReg();

  unsigned RegVal = Ctx.getRegisterInfo()->getEncodingValue(RegOpnd);

  unsigned T = (RegVal & 0x10) >> 2;

  unsigned Zt = RegVal & 0x3;

  return T | Zt;

}


uint32_t AArch64MCCodeEmitter::EncodeMatrixTileListRegisterClass(

    const MCInst &MI, unsigned OpIdx, SmallVectorImpl<MCFixup> &Fixups,

    const MCSubtargetInfo &STI) const {

  unsigned RegMask = MI.getOperand(OpIdx).getImm();

  assert(RegMask <= 0xFF && "Invalid register mask!");

  return RegMask;

}


template <unsigned BaseReg>

uint32_t

AArch64MCCodeEmitter::encodeMatrixIndexGPR32(const MCInst &MI, unsigned OpIdx,

                                             SmallVectorImpl<MCFixup> &Fixups,

                                             const MCSubtargetInfo &STI) const {

  auto RegOpnd = MI.getOperand(OpIdx).getReg();

  return RegOpnd - BaseReg;

}


uint32_t

AArch64MCCodeEmitter::getImm8OptLsl(const MCInst &MI, unsigned OpIdx,

                                    SmallVectorImpl<MCFixup> &Fixups,

                                    const MCSubtargetInfo &STI) const {

  // Test shift

  auto ShiftOpnd = MI.getOperand(OpIdx + 1).getImm();

  assert(AArch64_AM::getShiftType(ShiftOpnd) == AArch64_AM::LSL &&

         "Unexpected shift type for imm8_opt_lsl immediate.");


  unsigned ShiftVal = AArch64_AM::getShiftValue(ShiftOpnd);

  assert((ShiftVal == 0 || ShiftVal == 8) &&

         "Unexpected shift value for imm8_opt_lsl immediate.");


  // Test immediate

  auto Immediate = MI.getOperand(OpIdx).getImm();

  return (Immediate & 0xff) | (ShiftVal == 0 ? 0 : (1 << ShiftVal));

}


uint32_t

AArch64MCCodeEmitter::getSVEIncDecImm(const MCInst &MI, unsigned OpIdx,

                                           SmallVectorImpl<MCFixup> &Fixups,

                                           const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);

  assert(MO.isImm() && "Expected an immediate value!");

  // Normalize 1-16 range to 0-15.

  return MO.getImm() - 1;

}


/// getMoveVecShifterOpValue - Return the encoded value for the vector move

/// shifter (MSL).

uint32_t AArch64MCCodeEmitter::getMoveVecShifterOpValue(

    const MCInst &MI, unsigned OpIdx, SmallVectorImpl<MCFixup> &Fixups,

    const MCSubtargetInfo &STI) const {

  const MCOperand &MO = MI.getOperand(OpIdx);

  assert(MO.isImm() &&

         "Expected an immediate value for the move shift amount!");

  unsigned ShiftVal = AArch64_AM::getShiftValue(MO.getImm());

  assert((ShiftVal == 8 || ShiftVal == 16) && "Invalid shift amount!");

  return ShiftVal == 8 ? 0 : 1;

}


unsigned AArch64MCCodeEmitter::fixMOVZ(const MCInst &MI, unsigned EncodedValue,

                                       const MCSubtargetInfo &STI) const {

  // If one of the signed fixup kinds is applied to a MOVZ instruction, the

  // eventual result could be either a MOVZ or a MOVN. It's the MCCodeEmitter's

  // job to ensure that any bits possibly affected by this are 0. This means we

  // must zero out bit 30 (essentially emitting a MOVN).

  MCOperand UImm16MO = MI.getOperand(1);


  // Nothing to do if there's no fixup.

  if (UImm16MO.isImm())

    return EncodedValue;


  const MCExpr *E = UImm16MO.getExpr();

  if (const AArch64MCExpr *A64E = dyn_cast<AArch64MCExpr>(E)) {

    switch (A64E->getKind()) {

    case AArch64MCExpr::VK_DTPREL_G2:

    case AArch64MCExpr::VK_DTPREL_G1:

    case AArch64MCExpr::VK_DTPREL_G0:

    case AArch64MCExpr::VK_GOTTPREL_G1:

    case AArch64MCExpr::VK_TPREL_G2:

    case AArch64MCExpr::VK_TPREL_G1:

    case AArch64MCExpr::VK_TPREL_G0:

      return EncodedValue & ~(1u << 30);

    default:

      // Nothing to do for an unsigned fixup.

      return EncodedValue;

    }

  }


  return EncodedValue;

}


void AArch64MCCodeEmitter::encodeInstruction(const MCInst &MI,

                                             SmallVectorImpl<char> &CB,


                                             SmallVectorImpl<MCFixup> &Fixups,

                                             const MCSubtargetInfo &STI) const {

  if (MI.getOpcode() == AArch64::TLSDESCCALL) {

    // This is a directive which applies an R_AARCH64_TLSDESC_CALL to the

    // following (BLR) instruction. It doesn't emit any code itself so it

    // doesn't go through the normal TableGenerated channels.

    auto Reloc = STI.getTargetTriple().getEnvironment() == Triple::GNUILP32

                     ? ELF::R_AARCH64_P32_TLSDESC_CALL

                     : ELF::R_AARCH64_TLSDESC_CALL;

    Fixups.push_back(

        MCFixup::create(0, MI.getOperand(0).getExpr(),

                        MCFixupKind(FirstLiteralRelocationKind + Reloc)));

    return;

  }


  if (MI.getOpcode() == AArch64::SPACE) {

    // SPACE just increases basic block size, in both cases no actual code.

    return;

  }


  uint64_t Binary = getBinaryCodeForInstr(MI, Fixups, STI);

  support::endian::write<uint32_t>(CB, Binary, llvm::endianness::little);

  ++MCNumEmitted; // Keep track of the # of mi's emitted.

}


unsigned

AArch64MCCodeEmitter::fixMulHigh(const MCInst &MI,

                                 unsigned EncodedValue,

                                 const MCSubtargetInfo &STI) const {

  // The Ra field of SMULH and UMULH is unused: it should be assembled as 31

  // (i.e. all bits 1) but is ignored by the processor.

  EncodedValue |= 0x1f << 10;

  return EncodedValue;

}


template<int hasRs, int hasRt2> unsigned

AArch64MCCodeEmitter::fixLoadStoreExclusive(const MCInst &MI,

                                            unsigned EncodedValue,

                                            const MCSubtargetInfo &STI) const {

  if (!hasRs) EncodedValue |= 0x001F0000;

  if (!hasRt2) EncodedValue |= 0x00007C00;


  return EncodedValue;

}


unsigned AArch64MCCodeEmitter::fixOneOperandFPComparison(

    const MCInst &MI, unsigned EncodedValue, const MCSubtargetInfo &STI) const {

  // The Rm field of FCMP and friends is unused - it should be assembled

  // as 0, but is ignored by the processor.

  EncodedValue &= ~(0x1f << 16);

  return EncodedValue;

}


#include "AArch64GenMCCodeEmitter.inc"


MCCodeEmitter *llvm::createAArch64MCCodeEmitter(const MCInstrInfo &MCII,

                                                MCContext &Ctx) {

  return new AArch64MCCodeEmitter(MCII, Ctx);

}

AArch64AddressingModes.h

AArch64FixupKinds.h

AArch64MCExpr.h

getBranchTargetOpValue
static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, unsigned FixupKind, SmallVectorImpl< MCFixup > &Fixups, const MCSubtargetInfo &STI)
getBranchTargetOpValue - Helper function to get the branch target operand, which is either an immedia...
Definition: ARMMCCodeEmitter.cpp:608

ELF.h

Casting.h

EndianStream.h

MI
IRTranslator LLVM IR MI
Definition: IRTranslator.cpp:112

MCCodeEmitter.h

MCContext.h

MCFixup.h

MCInst.h

MCInstrInfo.h

MCRegisterInfo.h

MCSubtargetInfo.h

assert
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())

SmallVector.h
This file defines the SmallVector class.

Statistic.h
This file defines the 'Statistic' class, which is designed to be an easy way to expose various metric...

STATISTIC
#define STATISTIC(VARNAME, DESC)
Definition: Statistic.h:166

T

llvm::AArch64MCExpr
Definition: AArch64MCExpr.h:24

llvm::AArch64MCExpr::VariantKind
VariantKind
Definition: AArch64MCExpr.h:26

llvm::AArch64MCExpr::VK_DTPREL_G1
@ VK_DTPREL_G1
Definition: AArch64MCExpr.h:97

llvm::AArch64MCExpr::VK_TPREL_G2
@ VK_TPREL_G2
Definition: AArch64MCExpr.h:108

llvm::AArch64MCExpr::VK_TPREL_G1
@ VK_TPREL_G1
Definition: AArch64MCExpr.h:109

llvm::AArch64MCExpr::VK_TPREL_HI12
@ VK_TPREL_HI12
Definition: AArch64MCExpr.h:113

llvm::AArch64MCExpr::VK_DTPREL_G0
@ VK_DTPREL_G0
Definition: AArch64MCExpr.h:99

llvm::AArch64MCExpr::VK_GOTTPREL_G1
@ VK_GOTTPREL_G1
Definition: AArch64MCExpr.h:106

llvm::AArch64MCExpr::VK_DTPREL_G2
@ VK_DTPREL_G2
Definition: AArch64MCExpr.h:96

llvm::AArch64MCExpr::VK_DTPREL_HI12
@ VK_DTPREL_HI12
Definition: AArch64MCExpr.h:101

llvm::AArch64MCExpr::VK_SECREL_HI12
@ VK_SECREL_HI12
Definition: AArch64MCExpr.h:121

llvm::AArch64MCExpr::VK_TPREL_G0
@ VK_TPREL_G0
Definition: AArch64MCExpr.h:111

llvm::MCCodeEmitter
MCCodeEmitter - Generic instruction encoding interface.
Definition: MCCodeEmitter.h:21

llvm::MCCodeEmitter::encodeInstruction
virtual void encodeInstruction(const MCInst &Inst, SmallVectorImpl< char > &CB, SmallVectorImpl< MCFixup > &Fixups, const MCSubtargetInfo &STI) const =0
Encode the given Inst to bytes and append to CB.

llvm::MCCodeEmitter::operator=
MCCodeEmitter & operator=(const MCCodeEmitter &)=delete

llvm::MCContext
Context object for machine code objects.
Definition: MCContext.h:83

llvm::MCExpr
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:34

llvm::MCFixup::create
static MCFixup create(uint32_t Offset, const MCExpr *Value, MCFixupKind Kind, SMLoc Loc=SMLoc())
Definition: MCFixup.h:87

llvm::MCInst
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:185

llvm::MCInstrInfo
Interface to description of machine instruction set.
Definition: MCInstrInfo.h:26

llvm::MCOperand
Instances of this class represent operands of the MCInst class.
Definition: MCInst.h:37

llvm::MCOperand::getImm
int64_t getImm() const
Definition: MCInst.h:81

llvm::MCOperand::isImm
bool isImm() const
Definition: MCInst.h:63

llvm::MCOperand::isReg
bool isReg() const
Definition: MCInst.h:62

llvm::MCOperand::getReg
MCRegister getReg() const
Returns the register number.
Definition: MCInst.h:70

llvm::MCOperand::getExpr
const MCExpr * getExpr() const
Definition: MCInst.h:115

llvm::MCOperand::isExpr
bool isExpr() const
Definition: MCInst.h:66

llvm::MCSubtargetInfo
Generic base class for all target subtargets.
Definition: MCSubtargetInfo.h:76

llvm::MCSubtargetInfo::getTargetTriple
const Triple & getTargetTriple() const
Definition: MCSubtargetInfo.h:110

llvm::SmallVectorImpl
This class consists of common code factored out of the SmallVector class to reduce code duplication b...
Definition: SmallVector.h:573

llvm::Triple::GNUILP32
@ GNUILP32
Definition: Triple.h:259

llvm::Triple::getEnvironment
EnvironmentType getEnvironment() const
Get the parsed environment type of this triple.
Definition: Triple.h:412

uint32_t

uint64_t

ErrorHandling.h

llvm_unreachable
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
Definition: ErrorHandling.h:143

llvm::AArch64_AM::getShiftValue
static unsigned getShiftValue(unsigned Imm)
getShiftValue - Extract the shift value.
Definition: AArch64AddressingModes.h:85

llvm::AArch64_AM::LSL
@ LSL
Definition: AArch64AddressingModes.h:34

llvm::AArch64_AM::getShiftType
static AArch64_AM::ShiftExtendType getShiftType(unsigned Imm)
getShiftType - Extract the shift type.
Definition: AArch64AddressingModes.h:73

llvm::AArch64::Fixups
Fixups
Definition: AArch64FixupKinds.h:17

llvm::AArch64::fixup_aarch64_pcrel_branch9
@ fixup_aarch64_pcrel_branch9
Definition: AArch64FixupKinds.h:44

llvm::AArch64::fixup_aarch64_pcrel_branch16
@ fixup_aarch64_pcrel_branch16
Definition: AArch64FixupKinds.h:52

llvm::AArch64::fixup_aarch64_movw
@ fixup_aarch64_movw
Definition: AArch64FixupKinds.h:41

llvm::AArch64::fixup_aarch64_pcrel_call26
@ fixup_aarch64_pcrel_call26
Definition: AArch64FixupKinds.h:64

llvm::AArch64::fixup_aarch64_pcrel_branch26
@ fixup_aarch64_pcrel_branch26
Definition: AArch64FixupKinds.h:60

llvm::AArch64::fixup_aarch64_pcrel_branch19
@ fixup_aarch64_pcrel_branch19
Definition: AArch64FixupKinds.h:57

llvm::AArch64::fixup_aarch64_ldr_pcrel_imm19
@ fixup_aarch64_ldr_pcrel_imm19
Definition: AArch64FixupKinds.h:38

llvm::AArch64::fixup_aarch64_pcrel_adr_imm21
@ fixup_aarch64_pcrel_adr_imm21
Definition: AArch64FixupKinds.h:19

llvm::AArch64::fixup_aarch64_pcrel_branch14
@ fixup_aarch64_pcrel_branch14
Definition: AArch64FixupKinds.h:47

llvm::AArch64::fixup_aarch64_pcrel_adrp_imm21
@ fixup_aarch64_pcrel_adrp_imm21
Definition: AArch64FixupKinds.h:22

llvm::AArch64::fixup_aarch64_add_imm12
@ fixup_aarch64_add_imm12
Definition: AArch64FixupKinds.h:26

llvm::lltok::Kind
Kind
Definition: LLToken.h:18

llvm::msgpack::Type::Binary
@ Binary

llvm
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18

llvm::isPowerOf2_32
constexpr bool isPowerOf2_32(uint32_t Value)
Return true if the argument is a power of two > 0.
Definition: MathExtras.h:291

llvm::MCFixupKind
MCFixupKind
Extensible enumeration to represent the type of a fixup.
Definition: MCFixup.h:21

llvm::FirstLiteralRelocationKind
@ FirstLiteralRelocationKind
The range [FirstLiteralRelocationKind, MaxTargetFixupKind) is used for relocations coming from ....
Definition: MCFixup.h:50

llvm::endianness::little
@ little

llvm::createAArch64MCCodeEmitter
MCCodeEmitter * createAArch64MCCodeEmitter(const MCInstrInfo &MCII, MCContext &Ctx)
Definition: AArch64MCCodeEmitter.cpp:798