X86CodeEmitter.cpp [plain text]
#include "X86.h"
#include "X86InstrInfo.h"
#include "X86JITInfo.h"
#include "X86Relocations.h"
#include "X86Subtarget.h"
#include "X86TargetMachine.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/JITCodeEmitter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/PassManager.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
#define DEBUG_TYPE "x86-emitter"
STATISTIC(NumEmitted, "Number of machine instructions emitted");
namespace {
template<class CodeEmitter>
class Emitter : public MachineFunctionPass {
const X86InstrInfo *II;
const DataLayout *TD;
X86TargetMachine &TM;
CodeEmitter &MCE;
MachineModuleInfo *MMI;
intptr_t PICBaseOffset;
bool Is64BitMode;
bool IsPIC;
public:
static char ID;
explicit Emitter(X86TargetMachine &tm, CodeEmitter &mce)
: MachineFunctionPass(ID), II(nullptr), TD(nullptr), TM(tm),
MCE(mce), PICBaseOffset(0), Is64BitMode(false),
IsPIC(TM.getRelocationModel() == Reloc::PIC_) {}
bool runOnMachineFunction(MachineFunction &MF) override;
const char *getPassName() const override {
return "X86 Machine Code Emitter";
}
void emitOpcodePrefix(uint64_t TSFlags, int MemOperand,
const MachineInstr &MI,
const MCInstrDesc *Desc) const;
void emitVEXOpcodePrefix(uint64_t TSFlags, int MemOperand,
const MachineInstr &MI,
const MCInstrDesc *Desc) const;
void emitSegmentOverridePrefix(uint64_t TSFlags,
int MemOperand,
const MachineInstr &MI) const;
void emitInstruction(MachineInstr &MI, const MCInstrDesc *Desc);
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesAll();
AU.addRequired<MachineModuleInfo>();
MachineFunctionPass::getAnalysisUsage(AU);
}
private:
void emitPCRelativeBlockAddress(MachineBasicBlock *MBB);
void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
intptr_t Disp = 0, intptr_t PCAdj = 0,
bool Indirect = false);
void emitExternalSymbolAddress(const char *ES, unsigned Reloc);
void emitConstPoolAddress(unsigned CPI, unsigned Reloc, intptr_t Disp = 0,
intptr_t PCAdj = 0);
void emitJumpTableAddress(unsigned JTI, unsigned Reloc,
intptr_t PCAdj = 0);
void emitDisplacementField(const MachineOperand *RelocOp, int DispVal,
intptr_t Adj = 0, bool IsPCRel = true);
void emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeField);
void emitRegModRMByte(unsigned RegOpcodeField);
void emitSIBByte(unsigned SS, unsigned Index, unsigned Base);
void emitConstant(uint64_t Val, unsigned Size);
void emitMemModRMByte(const MachineInstr &MI,
unsigned Op, unsigned RegOpcodeField,
intptr_t PCAdj = 0);
unsigned getX86RegNum(unsigned RegNo) const {
const TargetRegisterInfo *TRI = TM.getSubtargetImpl()->getRegisterInfo();
return TRI->getEncodingValue(RegNo) & 0x7;
}
unsigned char getVEXRegisterEncoding(const MachineInstr &MI,
unsigned OpNum) const;
};
template<class CodeEmitter>
char Emitter<CodeEmitter>::ID = 0;
}
FunctionPass *llvm::createX86JITCodeEmitterPass(X86TargetMachine &TM,
JITCodeEmitter &JCE) {
return new Emitter<JITCodeEmitter>(TM, JCE);
}
template<class CodeEmitter>
bool Emitter<CodeEmitter>::runOnMachineFunction(MachineFunction &MF) {
MMI = &getAnalysis<MachineModuleInfo>();
MCE.setModuleInfo(MMI);
II = TM.getSubtargetImpl()->getInstrInfo();
TD = TM.getSubtargetImpl()->getDataLayout();
Is64BitMode = TM.getSubtarget<X86Subtarget>().is64Bit();
IsPIC = TM.getRelocationModel() == Reloc::PIC_;
do {
DEBUG(dbgs() << "JITTing function '" << MF.getName() << "'\n");
MCE.startFunction(MF);
for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
MBB != E; ++MBB) {
MCE.StartMachineBasicBlock(MBB);
for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end();
I != E; ++I) {
const MCInstrDesc &Desc = I->getDesc();
emitInstruction(*I, &Desc);
if (Desc.getOpcode() == X86::MOVPC32r)
emitInstruction(*I, &II->get(X86::POP32r));
++NumEmitted; }
}
} while (MCE.finishFunction(MF));
return false;
}
static unsigned determineREX(const MachineInstr &MI) {
unsigned REX = 0;
const MCInstrDesc &Desc = MI.getDesc();
if ((Desc.TSFlags & X86II::FormMask) == X86II::Pseudo)
return 0;
if (Desc.TSFlags & X86II::REX_W)
REX |= 1 << 3;
unsigned NumOps = Desc.getNumOperands();
if (NumOps) {
bool isTwoAddr = NumOps > 1 &&
Desc.getOperandConstraint(1, MCOI::TIED_TO) != -1;
unsigned i = isTwoAddr ? 1 : 0;
for (unsigned e = NumOps; i != e; ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (MO.isReg()) {
unsigned Reg = MO.getReg();
if (X86II::isX86_64NonExtLowByteReg(Reg))
REX |= 0x40;
}
}
switch (Desc.TSFlags & X86II::FormMask) {
case X86II::MRMSrcReg: {
if (X86InstrInfo::isX86_64ExtendedReg(MI.getOperand(0)))
REX |= 1 << 2;
i = isTwoAddr ? 2 : 1;
for (unsigned e = NumOps; i != e; ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (X86InstrInfo::isX86_64ExtendedReg(MO))
REX |= 1 << 0;
}
break;
}
case X86II::MRMSrcMem: {
if (X86InstrInfo::isX86_64ExtendedReg(MI.getOperand(0)))
REX |= 1 << 2;
unsigned Bit = 0;
i = isTwoAddr ? 2 : 1;
for (; i != NumOps; ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (MO.isReg()) {
if (X86InstrInfo::isX86_64ExtendedReg(MO))
REX |= 1 << Bit;
Bit++;
}
}
break;
}
case X86II::MRMXm:
case X86II::MRM0m: case X86II::MRM1m:
case X86II::MRM2m: case X86II::MRM3m:
case X86II::MRM4m: case X86II::MRM5m:
case X86II::MRM6m: case X86II::MRM7m:
case X86II::MRMDestMem: {
unsigned e = (isTwoAddr ? X86::AddrNumOperands+1 : X86::AddrNumOperands);
i = isTwoAddr ? 1 : 0;
if (NumOps > e && X86InstrInfo::isX86_64ExtendedReg(MI.getOperand(e)))
REX |= 1 << 2;
unsigned Bit = 0;
for (; i != e; ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (MO.isReg()) {
if (X86InstrInfo::isX86_64ExtendedReg(MO))
REX |= 1 << Bit;
Bit++;
}
}
break;
}
default: {
if (X86InstrInfo::isX86_64ExtendedReg(MI.getOperand(0)))
REX |= 1 << 0;
i = isTwoAddr ? 2 : 1;
for (unsigned e = NumOps; i != e; ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (X86InstrInfo::isX86_64ExtendedReg(MO))
REX |= 1 << 2;
}
break;
}
}
}
return REX;
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitPCRelativeBlockAddress(MachineBasicBlock *MBB) {
MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
X86::reloc_pcrel_word, MBB));
MCE.emitWordLE(0);
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitGlobalAddress(const GlobalValue *GV,
unsigned Reloc,
intptr_t Disp ,
intptr_t PCAdj ,
bool Indirect ) {
intptr_t RelocCST = Disp;
if (Reloc == X86::reloc_picrel_word)
RelocCST = PICBaseOffset;
else if (Reloc == X86::reloc_pcrel_word)
RelocCST = PCAdj;
MachineRelocation MR = Indirect
? MachineRelocation::getIndirectSymbol(MCE.getCurrentPCOffset(), Reloc,
const_cast<GlobalValue *>(GV),
RelocCST, false)
: MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
const_cast<GlobalValue *>(GV), RelocCST, false);
MCE.addRelocation(MR);
if (Reloc == X86::reloc_absolute_dword)
MCE.emitDWordLE(Disp);
else
MCE.emitWordLE((int32_t)Disp);
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitExternalSymbolAddress(const char *ES,
unsigned Reloc) {
intptr_t RelocCST = (Reloc == X86::reloc_picrel_word) ? PICBaseOffset : 0;
bool NeedStub = false;
MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
Reloc, ES, RelocCST,
0, NeedStub));
if (Reloc == X86::reloc_absolute_dword)
MCE.emitDWordLE(0);
else
MCE.emitWordLE(0);
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitConstPoolAddress(unsigned CPI, unsigned Reloc,
intptr_t Disp ,
intptr_t PCAdj ) {
intptr_t RelocCST = 0;
if (Reloc == X86::reloc_picrel_word)
RelocCST = PICBaseOffset;
else if (Reloc == X86::reloc_pcrel_word)
RelocCST = PCAdj;
MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
Reloc, CPI, RelocCST));
if (Reloc == X86::reloc_absolute_dword)
MCE.emitDWordLE(Disp);
else
MCE.emitWordLE((int32_t)Disp);
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitJumpTableAddress(unsigned JTI, unsigned Reloc,
intptr_t PCAdj ) {
intptr_t RelocCST = 0;
if (Reloc == X86::reloc_picrel_word)
RelocCST = PICBaseOffset;
else if (Reloc == X86::reloc_pcrel_word)
RelocCST = PCAdj;
MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
Reloc, JTI, RelocCST));
if (Reloc == X86::reloc_absolute_dword)
MCE.emitDWordLE(0);
else
MCE.emitWordLE(0);
}
inline static unsigned char ModRMByte(unsigned Mod, unsigned RegOpcode,
unsigned RM) {
assert(Mod < 4 && RegOpcode < 8 && RM < 8 && "ModRM Fields out of range!");
return RM | (RegOpcode << 3) | (Mod << 6);
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitRegModRMByte(unsigned ModRMReg,
unsigned RegOpcodeFld){
MCE.emitByte(ModRMByte(3, RegOpcodeFld, getX86RegNum(ModRMReg)));
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitRegModRMByte(unsigned RegOpcodeFld) {
MCE.emitByte(ModRMByte(3, RegOpcodeFld, 0));
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitSIBByte(unsigned SS,
unsigned Index,
unsigned Base) {
MCE.emitByte(ModRMByte(SS, Index, Base));
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitConstant(uint64_t Val, unsigned Size) {
for (unsigned i = 0; i != Size; ++i) {
MCE.emitByte(Val & 255);
Val >>= 8;
}
}
static bool isDisp8(int Value) {
return Value == (signed char)Value;
}
static bool gvNeedsNonLazyPtr(const MachineOperand &GVOp,
const TargetMachine &TM) {
if (TM.getSubtarget<X86Subtarget>().is64Bit() &&
!TM.getSubtarget<X86Subtarget>().isTargetDarwin())
return false;
return isGlobalStubReference(GVOp.getTargetFlags());
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitDisplacementField(const MachineOperand *RelocOp,
int DispVal,
intptr_t Adj ,
bool IsPCRel ) {
if (!RelocOp) {
emitConstant(DispVal, 4);
return;
}
unsigned RelocType = Is64BitMode ?
(IsPCRel ? X86::reloc_pcrel_word : X86::reloc_absolute_word_sext)
: (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
if (RelocOp->isGlobal()) {
bool Indirect = gvNeedsNonLazyPtr(*RelocOp, TM);
emitGlobalAddress(RelocOp->getGlobal(), RelocType, RelocOp->getOffset(),
Adj, Indirect);
} else if (RelocOp->isSymbol()) {
emitExternalSymbolAddress(RelocOp->getSymbolName(), RelocType);
} else if (RelocOp->isCPI()) {
emitConstPoolAddress(RelocOp->getIndex(), RelocType,
RelocOp->getOffset(), Adj);
} else {
assert(RelocOp->isJTI() && "Unexpected machine operand!");
emitJumpTableAddress(RelocOp->getIndex(), RelocType, Adj);
}
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitMemModRMByte(const MachineInstr &MI,
unsigned Op,unsigned RegOpcodeField,
intptr_t PCAdj) {
const MachineOperand &Op3 = MI.getOperand(Op+3);
int DispVal = 0;
const MachineOperand *DispForReloc = nullptr;
if (Op3.isGlobal()) {
DispForReloc = &Op3;
} else if (Op3.isSymbol()) {
DispForReloc = &Op3;
} else if (Op3.isCPI()) {
if (!MCE.earlyResolveAddresses() || Is64BitMode || IsPIC) {
DispForReloc = &Op3;
} else {
DispVal += MCE.getConstantPoolEntryAddress(Op3.getIndex());
DispVal += Op3.getOffset();
}
} else if (Op3.isJTI()) {
if (!MCE.earlyResolveAddresses() || Is64BitMode || IsPIC) {
DispForReloc = &Op3;
} else {
DispVal += MCE.getJumpTableEntryAddress(Op3.getIndex());
}
} else {
DispVal = Op3.getImm();
}
const MachineOperand &Base = MI.getOperand(Op);
const MachineOperand &Scale = MI.getOperand(Op+1);
const MachineOperand &IndexReg = MI.getOperand(Op+2);
unsigned BaseReg = Base.getReg();
if (BaseReg == X86::RIP ||
(Is64BitMode && DispForReloc)) { assert(IndexReg.getReg() == 0 && Is64BitMode &&
"Invalid rip-relative address");
MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
emitDisplacementField(DispForReloc, DispVal, PCAdj, true);
return;
}
bool IsPCRel = MCE.earlyResolveAddresses() ? true : false;
unsigned BaseRegNo = -1U;
if (BaseReg != 0 && BaseReg != X86::RIP)
BaseRegNo = getX86RegNum(BaseReg);
if ( IndexReg.getReg() == 0 &&
BaseRegNo != N86::ESP &&
(!Is64BitMode || BaseReg != 0)) {
if (BaseReg == 0 || BaseReg == X86::RIP) { MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
emitDisplacementField(DispForReloc, DispVal, PCAdj, true);
return;
}
if (!DispForReloc && DispVal == 0 && BaseRegNo != N86::EBP) {
MCE.emitByte(ModRMByte(0, RegOpcodeField, BaseRegNo));
return;
}
if (!DispForReloc && isDisp8(DispVal)) {
MCE.emitByte(ModRMByte(1, RegOpcodeField, BaseRegNo));
emitConstant(DispVal, 1);
return;
}
MCE.emitByte(ModRMByte(2, RegOpcodeField, BaseRegNo));
emitDisplacementField(DispForReloc, DispVal, PCAdj, IsPCRel);
return;
}
assert(IndexReg.getReg() != X86::ESP &&
IndexReg.getReg() != X86::RSP && "Cannot use ESP as index reg!");
bool ForceDisp32 = false;
bool ForceDisp8 = false;
if (BaseReg == 0) {
MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
ForceDisp32 = true;
} else if (DispForReloc) {
MCE.emitByte(ModRMByte(2, RegOpcodeField, 4));
ForceDisp32 = true;
} else if (DispVal == 0 && BaseRegNo != N86::EBP) {
MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
} else if (isDisp8(DispVal)) {
MCE.emitByte(ModRMByte(1, RegOpcodeField, 4));
ForceDisp8 = true; } else {
MCE.emitByte(ModRMByte(2, RegOpcodeField, 4));
}
static const unsigned SSTable[] = { ~0U, 0, 1, ~0U, 2, ~0U, ~0U, ~0U, 3 };
unsigned SS = SSTable[Scale.getImm()];
if (BaseReg == 0) {
unsigned IndexRegNo;
if (IndexReg.getReg())
IndexRegNo = getX86RegNum(IndexReg.getReg());
else IndexRegNo = 4;
emitSIBByte(SS, IndexRegNo, 5);
} else {
unsigned BaseRegNo = getX86RegNum(BaseReg);
unsigned IndexRegNo;
if (IndexReg.getReg())
IndexRegNo = getX86RegNum(IndexReg.getReg());
else
IndexRegNo = 4; emitSIBByte(SS, IndexRegNo, BaseRegNo);
}
if (ForceDisp8) {
emitConstant(DispVal, 1);
} else if (DispVal != 0 || ForceDisp32) {
emitDisplacementField(DispForReloc, DispVal, PCAdj, IsPCRel);
}
}
static const MCInstrDesc *UpdateOp(MachineInstr &MI, const X86InstrInfo *II,
unsigned Opcode) {
const MCInstrDesc *Desc = &II->get(Opcode);
MI.setDesc(*Desc);
return Desc;
}
static bool Is16BitMemOperand(const MachineInstr &MI, unsigned Op) {
const MachineOperand &BaseReg = MI.getOperand(Op+X86::AddrBaseReg);
const MachineOperand &IndexReg = MI.getOperand(Op+X86::AddrIndexReg);
if ((BaseReg.getReg() != 0 &&
X86MCRegisterClasses[X86::GR16RegClassID].contains(BaseReg.getReg())) ||
(IndexReg.getReg() != 0 &&
X86MCRegisterClasses[X86::GR16RegClassID].contains(IndexReg.getReg())))
return true;
return false;
}
static bool Is32BitMemOperand(const MachineInstr &MI, unsigned Op) {
const MachineOperand &BaseReg = MI.getOperand(Op+X86::AddrBaseReg);
const MachineOperand &IndexReg = MI.getOperand(Op+X86::AddrIndexReg);
if ((BaseReg.getReg() != 0 &&
X86MCRegisterClasses[X86::GR32RegClassID].contains(BaseReg.getReg())) ||
(IndexReg.getReg() != 0 &&
X86MCRegisterClasses[X86::GR32RegClassID].contains(IndexReg.getReg())))
return true;
return false;
}
#ifndef NDEBUG
static bool Is64BitMemOperand(const MachineInstr &MI, unsigned Op) {
const MachineOperand &BaseReg = MI.getOperand(Op+X86::AddrBaseReg);
const MachineOperand &IndexReg = MI.getOperand(Op+X86::AddrIndexReg);
if ((BaseReg.getReg() != 0 &&
X86MCRegisterClasses[X86::GR64RegClassID].contains(BaseReg.getReg())) ||
(IndexReg.getReg() != 0 &&
X86MCRegisterClasses[X86::GR64RegClassID].contains(IndexReg.getReg())))
return true;
return false;
}
#endif
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitOpcodePrefix(uint64_t TSFlags,
int MemOperand,
const MachineInstr &MI,
const MCInstrDesc *Desc) const {
if (((TSFlags & X86II::OpSizeMask) >> X86II::OpSizeShift) == X86II::OpSize16)
MCE.emitByte(0x66);
switch (Desc->TSFlags & X86II::OpPrefixMask) {
case X86II::PD: MCE.emitByte(0x66);
break;
case X86II::XS: MCE.emitByte(0xF3);
break;
case X86II::XD: MCE.emitByte(0xF2);
break;
}
if (Is64BitMode) {
if (unsigned REX = determineREX(MI))
MCE.emitByte(0x40 | REX);
}
switch (Desc->TSFlags & X86II::OpMapMask) {
case X86II::TB: case X86II::T8: case X86II::TA: MCE.emitByte(0x0F);
break;
}
switch (Desc->TSFlags & X86II::OpMapMask) {
case X86II::T8: MCE.emitByte(0x38);
break;
case X86II::TA: MCE.emitByte(0x3A);
break;
}
}
template<class CodeEmitter>
unsigned char
Emitter<CodeEmitter>::getVEXRegisterEncoding(const MachineInstr &MI,
unsigned OpNum) const {
unsigned SrcReg = MI.getOperand(OpNum).getReg();
unsigned SrcRegNum = getX86RegNum(MI.getOperand(OpNum).getReg());
if (X86II::isX86_64ExtendedReg(SrcReg))
SrcRegNum |= 8;
return (~SrcRegNum) & 0xf;
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitSegmentOverridePrefix(uint64_t TSFlags,
int MemOperand,
const MachineInstr &MI) const {
if (MemOperand < 0)
return;
switch (MI.getOperand(MemOperand+X86::AddrSegmentReg).getReg()) {
default: llvm_unreachable("Unknown segment register!");
case 0: break;
case X86::CS: MCE.emitByte(0x2E); break;
case X86::SS: MCE.emitByte(0x36); break;
case X86::DS: MCE.emitByte(0x3E); break;
case X86::ES: MCE.emitByte(0x26); break;
case X86::FS: MCE.emitByte(0x64); break;
case X86::GS: MCE.emitByte(0x65); break;
}
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitVEXOpcodePrefix(uint64_t TSFlags,
int MemOperand,
const MachineInstr &MI,
const MCInstrDesc *Desc) const {
unsigned char Encoding = (TSFlags & X86II::EncodingMask) >>
X86II::EncodingShift;
bool HasVEX_4V = (TSFlags >> X86II::VEXShift) & X86II::VEX_4V;
bool HasVEX_4VOp3 = (TSFlags >> X86II::VEXShift) & X86II::VEX_4VOp3;
bool HasMemOp4 = (TSFlags >> X86II::VEXShift) & X86II::MemOp4;
unsigned char VEX_R = 0x1;
unsigned char VEX_X = 0x1;
unsigned char VEX_B = 0x1;
unsigned char VEX_W = 0;
unsigned char VEX_5M = 0;
unsigned char VEX_4V = 0xf;
unsigned char VEX_L = 0;
unsigned char VEX_PP = 0;
if ((TSFlags >> X86II::VEXShift) & X86II::VEX_W)
VEX_W = 1;
if ((TSFlags >> X86II::VEXShift) & X86II::VEX_L)
VEX_L = 1;
switch (TSFlags & X86II::OpPrefixMask) {
default: break; case X86II::PD: VEX_PP = 0x1; break; case X86II::XS: VEX_PP = 0x2; break; case X86II::XD: VEX_PP = 0x3; break; }
switch (TSFlags & X86II::OpMapMask) {
default: llvm_unreachable("Invalid prefix!");
case X86II::TB: VEX_5M = 0x1; break; case X86II::T8: VEX_5M = 0x2; break; case X86II::TA: VEX_5M = 0x3; break; case X86II::XOP8: VEX_5M = 0x8; break;
case X86II::XOP9: VEX_5M = 0x9; break;
case X86II::XOPA: VEX_5M = 0xA; break;
}
unsigned NumOps = Desc->getNumOperands();
unsigned CurOp = 0;
if (NumOps > 1 && Desc->getOperandConstraint(1, MCOI::TIED_TO) == 0)
++CurOp;
else if (NumOps > 3 && Desc->getOperandConstraint(2, MCOI::TIED_TO) == 0) {
assert(Desc->getOperandConstraint(NumOps - 1, MCOI::TIED_TO) == 1);
CurOp += 2;
}
switch (TSFlags & X86II::FormMask) {
default: llvm_unreachable("Unexpected form in emitVEXOpcodePrefix!");
case X86II::RawFrm:
break;
case X86II::MRMDestMem: {
if (X86II::isX86_64ExtendedReg(MI.getOperand(X86::AddrBaseReg).getReg()))
VEX_B = 0x0;
if (X86II::isX86_64ExtendedReg(MI.getOperand(X86::AddrIndexReg).getReg()))
VEX_X = 0x0;
CurOp = X86::AddrNumOperands;
if (HasVEX_4V)
VEX_4V = getVEXRegisterEncoding(MI, CurOp++);
const MachineOperand &MO = MI.getOperand(CurOp);
if (MO.isReg() && X86II::isX86_64ExtendedReg(MO.getReg()))
VEX_R = 0x0;
break;
}
case X86II::MRMSrcMem:
if (X86II::isX86_64ExtendedReg(MI.getOperand(CurOp).getReg()))
VEX_R = 0x0;
CurOp++;
if (HasVEX_4V) {
VEX_4V = getVEXRegisterEncoding(MI, CurOp);
CurOp++;
}
if (X86II::isX86_64ExtendedReg(
MI.getOperand(MemOperand+X86::AddrBaseReg).getReg()))
VEX_B = 0x0;
if (X86II::isX86_64ExtendedReg(
MI.getOperand(MemOperand+X86::AddrIndexReg).getReg()))
VEX_X = 0x0;
if (HasVEX_4VOp3)
VEX_4V = getVEXRegisterEncoding(MI, CurOp+X86::AddrNumOperands);
break;
case X86II::MRM0m: case X86II::MRM1m:
case X86II::MRM2m: case X86II::MRM3m:
case X86II::MRM4m: case X86II::MRM5m:
case X86II::MRM6m: case X86II::MRM7m: {
if (HasVEX_4V)
VEX_4V = getVEXRegisterEncoding(MI, CurOp++);
if (X86II::isX86_64ExtendedReg(
MI.getOperand(MemOperand+X86::AddrBaseReg).getReg()))
VEX_B = 0x0;
if (X86II::isX86_64ExtendedReg(
MI.getOperand(MemOperand+X86::AddrIndexReg).getReg()))
VEX_X = 0x0;
break;
}
case X86II::MRMSrcReg:
if (X86II::isX86_64ExtendedReg(MI.getOperand(CurOp).getReg()))
VEX_R = 0x0;
CurOp++;
if (HasVEX_4V)
VEX_4V = getVEXRegisterEncoding(MI, CurOp++);
if (HasMemOp4) CurOp++;
if (X86II::isX86_64ExtendedReg(MI.getOperand(CurOp).getReg()))
VEX_B = 0x0;
CurOp++;
if (HasVEX_4VOp3)
VEX_4V = getVEXRegisterEncoding(MI, CurOp);
break;
case X86II::MRMDestReg:
if (X86II::isX86_64ExtendedReg(MI.getOperand(CurOp).getReg()))
VEX_B = 0x0;
CurOp++;
if (HasVEX_4V)
VEX_4V = getVEXRegisterEncoding(MI, CurOp++);
if (X86II::isX86_64ExtendedReg(MI.getOperand(CurOp).getReg()))
VEX_R = 0x0;
break;
case X86II::MRM0r: case X86II::MRM1r:
case X86II::MRM2r: case X86II::MRM3r:
case X86II::MRM4r: case X86II::MRM5r:
case X86II::MRM6r: case X86II::MRM7r:
VEX_4V = getVEXRegisterEncoding(MI, CurOp);
CurOp++;
if (X86II::isX86_64ExtendedReg(MI.getOperand(CurOp).getReg()))
VEX_B = 0x0;
break;
}
emitSegmentOverridePrefix(TSFlags, MemOperand, MI);
unsigned char LastByte = VEX_PP | (VEX_L << 2) | (VEX_4V << 3);
if (Encoding == X86II::VEX && VEX_B && VEX_X && !VEX_W && (VEX_5M == 1)) {
MCE.emitByte(0xC5);
MCE.emitByte(LastByte | (VEX_R << 7));
return;
}
MCE.emitByte(Encoding == X86II::XOP ? 0x8F : 0xC4);
MCE.emitByte(VEX_R << 7 | VEX_X << 6 | VEX_B << 5 | VEX_5M);
MCE.emitByte(LastByte | (VEX_W << 7));
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitInstruction(MachineInstr &MI,
const MCInstrDesc *Desc) {
DEBUG(dbgs() << MI);
switch (Desc->getOpcode()) {
case X86::ADD16rr_DB: Desc = UpdateOp(MI, II, X86::OR16rr); break;
case X86::ADD32rr_DB: Desc = UpdateOp(MI, II, X86::OR32rr); break;
case X86::ADD64rr_DB: Desc = UpdateOp(MI, II, X86::OR64rr); break;
case X86::ADD16ri_DB: Desc = UpdateOp(MI, II, X86::OR16ri); break;
case X86::ADD32ri_DB: Desc = UpdateOp(MI, II, X86::OR32ri); break;
case X86::ADD64ri32_DB: Desc = UpdateOp(MI, II, X86::OR64ri32); break;
case X86::ADD16ri8_DB: Desc = UpdateOp(MI, II, X86::OR16ri8); break;
case X86::ADD32ri8_DB: Desc = UpdateOp(MI, II, X86::OR32ri8); break;
case X86::ADD64ri8_DB: Desc = UpdateOp(MI, II, X86::OR64ri8); break;
case X86::ACQUIRE_MOV8rm: Desc = UpdateOp(MI, II, X86::MOV8rm); break;
case X86::ACQUIRE_MOV16rm: Desc = UpdateOp(MI, II, X86::MOV16rm); break;
case X86::ACQUIRE_MOV32rm: Desc = UpdateOp(MI, II, X86::MOV32rm); break;
case X86::ACQUIRE_MOV64rm: Desc = UpdateOp(MI, II, X86::MOV64rm); break;
case X86::RELEASE_MOV8mr: Desc = UpdateOp(MI, II, X86::MOV8mr); break;
case X86::RELEASE_MOV16mr: Desc = UpdateOp(MI, II, X86::MOV16mr); break;
case X86::RELEASE_MOV32mr: Desc = UpdateOp(MI, II, X86::MOV32mr); break;
case X86::RELEASE_MOV64mr: Desc = UpdateOp(MI, II, X86::MOV64mr); break;
}
MCE.processDebugLoc(MI.getDebugLoc(), true);
unsigned Opcode = Desc->Opcode;
unsigned NumOps = Desc->getNumOperands();
unsigned CurOp = 0;
if (NumOps > 1 && Desc->getOperandConstraint(1, MCOI::TIED_TO) == 0)
++CurOp;
else if (NumOps > 3 && Desc->getOperandConstraint(2, MCOI::TIED_TO) == 0) {
assert(Desc->getOperandConstraint(NumOps - 1, MCOI::TIED_TO) == 1);
CurOp += 2;
}
uint64_t TSFlags = Desc->TSFlags;
unsigned char Encoding = (TSFlags & X86II::EncodingMask) >>
X86II::EncodingShift;
bool HasVEX_4V = (TSFlags >> X86II::VEXShift) & X86II::VEX_4V;
bool HasVEX_4VOp3 = (TSFlags >> X86II::VEXShift) & X86II::VEX_4VOp3;
bool HasMemOp4 = (TSFlags >> X86II::VEXShift) & X86II::MemOp4;
const unsigned MemOp4_I8IMMOperand = 2;
int MemoryOperand = X86II::getMemoryOperandNo(TSFlags, Opcode);
if (MemoryOperand != -1) MemoryOperand += CurOp;
if (Desc->TSFlags & X86II::LOCK)
MCE.emitByte(0xF0);
emitSegmentOverridePrefix(TSFlags, MemoryOperand, MI);
if (Desc->TSFlags & X86II::REP)
MCE.emitByte(0xF3);
bool need_address_override;
if (TSFlags & X86II::AdSize) {
need_address_override = true;
} else if (MemoryOperand < 0) {
need_address_override = false;
} else if (Is64BitMode) {
assert(!Is16BitMemOperand(MI, MemoryOperand));
need_address_override = Is32BitMemOperand(MI, MemoryOperand);
} else {
assert(!Is64BitMemOperand(MI, MemoryOperand));
need_address_override = Is16BitMemOperand(MI, MemoryOperand);
}
if (need_address_override)
MCE.emitByte(0x67);
if (Encoding == 0)
emitOpcodePrefix(TSFlags, MemoryOperand, MI, Desc);
else
emitVEXOpcodePrefix(TSFlags, MemoryOperand, MI, Desc);
unsigned char BaseOpcode = X86II::getBaseOpcodeFor(Desc->TSFlags);
switch (TSFlags & X86II::FormMask) {
default:
llvm_unreachable("Unknown FormMask value in X86 MachineCodeEmitter!");
case X86II::Pseudo:
switch (Opcode) {
default:
llvm_unreachable("pseudo instructions should be removed before code"
" emission");
case X86::Int_MemBarrier:
DEBUG(dbgs() << "#MEMBARRIER\n");
break;
case TargetOpcode::INLINEASM:
if (MI.getOperand(0).getSymbolName()[0]) {
DebugLoc DL = MI.getDebugLoc();
DL.print(MI.getParent()->getParent()->getFunction()->getContext(),
llvm::errs());
report_fatal_error("JIT does not support inline asm!");
}
break;
case TargetOpcode::DBG_VALUE:
case TargetOpcode::CFI_INSTRUCTION:
break;
case TargetOpcode::GC_LABEL:
case TargetOpcode::EH_LABEL:
MCE.emitLabel(MI.getOperand(0).getMCSymbol());
break;
case TargetOpcode::IMPLICIT_DEF:
case TargetOpcode::KILL:
break;
case X86::SEH_PushReg:
case X86::SEH_SaveReg:
case X86::SEH_SaveXMM:
case X86::SEH_StackAlloc:
case X86::SEH_SetFrame:
case X86::SEH_PushFrame:
case X86::SEH_EndPrologue:
case X86::SEH_Epilogue:
break;
case X86::MOVPC32r: {
MCE.emitByte(BaseOpcode);
emitConstant(0, X86II::getSizeOfImm(Desc->TSFlags));
PICBaseOffset = (intptr_t) MCE.getCurrentPCOffset();
X86JITInfo *JTI = TM.getSubtargetImpl()->getJITInfo();
JTI->setPICBase(MCE.getCurrentPCValue());
break;
}
}
CurOp = NumOps;
break;
case X86II::RawFrm: {
MCE.emitByte(BaseOpcode);
if (CurOp == NumOps)
break;
const MachineOperand &MO = MI.getOperand(CurOp++);
DEBUG(dbgs() << "RawFrm CurOp " << CurOp << "\n");
DEBUG(dbgs() << "isMBB " << MO.isMBB() << "\n");
DEBUG(dbgs() << "isGlobal " << MO.isGlobal() << "\n");
DEBUG(dbgs() << "isSymbol " << MO.isSymbol() << "\n");
DEBUG(dbgs() << "isImm " << MO.isImm() << "\n");
if (MO.isMBB()) {
emitPCRelativeBlockAddress(MO.getMBB());
break;
}
if (MO.isGlobal()) {
emitGlobalAddress(MO.getGlobal(), X86::reloc_pcrel_word,
MO.getOffset(), 0);
break;
}
if (MO.isSymbol()) {
emitExternalSymbolAddress(MO.getSymbolName(), X86::reloc_pcrel_word);
break;
}
if (MO.isJTI()) {
emitJumpTableAddress(MO.getIndex(), X86::reloc_pcrel_word);
break;
}
assert(MO.isImm() && "Unknown RawFrm operand!");
if (Opcode == X86::CALLpcrel32 || Opcode == X86::CALL64pcrel32) {
intptr_t Imm = (intptr_t)MO.getImm();
Imm = Imm - MCE.getCurrentPCValue() - 4;
emitConstant(Imm, X86II::getSizeOfImm(Desc->TSFlags));
} else
emitConstant(MO.getImm(), X86II::getSizeOfImm(Desc->TSFlags));
break;
}
case X86II::AddRegFrm: {
MCE.emitByte(BaseOpcode +
getX86RegNum(MI.getOperand(CurOp++).getReg()));
if (CurOp == NumOps)
break;
const MachineOperand &MO1 = MI.getOperand(CurOp++);
unsigned Size = X86II::getSizeOfImm(Desc->TSFlags);
if (MO1.isImm()) {
emitConstant(MO1.getImm(), Size);
break;
}
unsigned rt = Is64BitMode ? X86::reloc_pcrel_word
: (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
if (Opcode == X86::MOV32ri64)
rt = X86::reloc_absolute_word; if (Opcode == X86::MOV64ri)
rt = X86::reloc_absolute_dword; if (MO1.isGlobal()) {
bool Indirect = gvNeedsNonLazyPtr(MO1, TM);
emitGlobalAddress(MO1.getGlobal(), rt, MO1.getOffset(), 0,
Indirect);
} else if (MO1.isSymbol())
emitExternalSymbolAddress(MO1.getSymbolName(), rt);
else if (MO1.isCPI())
emitConstPoolAddress(MO1.getIndex(), rt);
else if (MO1.isJTI())
emitJumpTableAddress(MO1.getIndex(), rt);
break;
}
case X86II::MRMDestReg: {
MCE.emitByte(BaseOpcode);
unsigned SrcRegNum = CurOp+1;
if (HasVEX_4V) SrcRegNum++;
emitRegModRMByte(MI.getOperand(CurOp).getReg(),
getX86RegNum(MI.getOperand(SrcRegNum).getReg()));
CurOp = SrcRegNum + 1;
break;
}
case X86II::MRMDestMem: {
MCE.emitByte(BaseOpcode);
unsigned SrcRegNum = CurOp + X86::AddrNumOperands;
if (HasVEX_4V) SrcRegNum++;
emitMemModRMByte(MI, CurOp,
getX86RegNum(MI.getOperand(SrcRegNum).getReg()));
CurOp = SrcRegNum + 1;
break;
}
case X86II::MRMSrcReg: {
MCE.emitByte(BaseOpcode);
unsigned SrcRegNum = CurOp+1;
if (HasVEX_4V) ++SrcRegNum;
if (HasMemOp4) ++SrcRegNum;
emitRegModRMByte(MI.getOperand(SrcRegNum).getReg(),
getX86RegNum(MI.getOperand(CurOp).getReg()));
CurOp = HasMemOp4 ? SrcRegNum : SrcRegNum + 1;
if (HasVEX_4VOp3)
++CurOp;
break;
}
case X86II::MRMSrcMem: {
int AddrOperands = X86::AddrNumOperands;
unsigned FirstMemOp = CurOp+1;
if (HasVEX_4V) {
++AddrOperands;
++FirstMemOp; }
if (HasMemOp4) ++FirstMemOp;
MCE.emitByte(BaseOpcode);
intptr_t PCAdj = (CurOp + AddrOperands + 1 != NumOps) ?
X86II::getSizeOfImm(Desc->TSFlags) : 0;
emitMemModRMByte(MI, FirstMemOp,
getX86RegNum(MI.getOperand(CurOp).getReg()),PCAdj);
CurOp += AddrOperands + 1;
if (HasVEX_4VOp3)
++CurOp;
break;
}
case X86II::MRMXr:
case X86II::MRM0r: case X86II::MRM1r:
case X86II::MRM2r: case X86II::MRM3r:
case X86II::MRM4r: case X86II::MRM5r:
case X86II::MRM6r: case X86II::MRM7r: {
if (HasVEX_4V) ++CurOp;
MCE.emitByte(BaseOpcode);
uint64_t Form = (Desc->TSFlags & X86II::FormMask);
emitRegModRMByte(MI.getOperand(CurOp++).getReg(),
(Form == X86II::MRMXr) ? 0 : Form-X86II::MRM0r);
if (CurOp == NumOps)
break;
const MachineOperand &MO1 = MI.getOperand(CurOp++);
unsigned Size = X86II::getSizeOfImm(Desc->TSFlags);
if (MO1.isImm()) {
emitConstant(MO1.getImm(), Size);
break;
}
unsigned rt = Is64BitMode ? X86::reloc_pcrel_word
: (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
if (Opcode == X86::MOV64ri32)
rt = X86::reloc_absolute_word_sext; if (MO1.isGlobal()) {
bool Indirect = gvNeedsNonLazyPtr(MO1, TM);
emitGlobalAddress(MO1.getGlobal(), rt, MO1.getOffset(), 0,
Indirect);
} else if (MO1.isSymbol())
emitExternalSymbolAddress(MO1.getSymbolName(), rt);
else if (MO1.isCPI())
emitConstPoolAddress(MO1.getIndex(), rt);
else if (MO1.isJTI())
emitJumpTableAddress(MO1.getIndex(), rt);
break;
}
case X86II::MRMXm:
case X86II::MRM0m: case X86II::MRM1m:
case X86II::MRM2m: case X86II::MRM3m:
case X86II::MRM4m: case X86II::MRM5m:
case X86II::MRM6m: case X86II::MRM7m: {
if (HasVEX_4V) ++CurOp;
intptr_t PCAdj = (CurOp + X86::AddrNumOperands != NumOps) ?
(MI.getOperand(CurOp+X86::AddrNumOperands).isImm() ?
X86II::getSizeOfImm(Desc->TSFlags) : 4) : 0;
MCE.emitByte(BaseOpcode);
uint64_t Form = (Desc->TSFlags & X86II::FormMask);
emitMemModRMByte(MI, CurOp, (Form==X86II::MRMXm) ? 0 : Form - X86II::MRM0m,
PCAdj);
CurOp += X86::AddrNumOperands;
if (CurOp == NumOps)
break;
const MachineOperand &MO = MI.getOperand(CurOp++);
unsigned Size = X86II::getSizeOfImm(Desc->TSFlags);
if (MO.isImm()) {
emitConstant(MO.getImm(), Size);
break;
}
unsigned rt = Is64BitMode ? X86::reloc_pcrel_word
: (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
if (Opcode == X86::MOV64mi32)
rt = X86::reloc_absolute_word_sext; if (MO.isGlobal()) {
bool Indirect = gvNeedsNonLazyPtr(MO, TM);
emitGlobalAddress(MO.getGlobal(), rt, MO.getOffset(), 0,
Indirect);
} else if (MO.isSymbol())
emitExternalSymbolAddress(MO.getSymbolName(), rt);
else if (MO.isCPI())
emitConstPoolAddress(MO.getIndex(), rt);
else if (MO.isJTI())
emitJumpTableAddress(MO.getIndex(), rt);
break;
}
case X86II::MRM_C0: case X86II::MRM_C1: case X86II::MRM_C2:
case X86II::MRM_C3: case X86II::MRM_C4: case X86II::MRM_C8:
case X86II::MRM_C9: case X86II::MRM_CA: case X86II::MRM_CB:
case X86II::MRM_CF: case X86II::MRM_D0: case X86II::MRM_D1:
case X86II::MRM_D4: case X86II::MRM_D5: case X86II::MRM_D6:
case X86II::MRM_D7: case X86II::MRM_D8: case X86II::MRM_D9:
case X86II::MRM_DA: case X86II::MRM_DB: case X86II::MRM_DC:
case X86II::MRM_DD: case X86II::MRM_DE: case X86II::MRM_DF:
case X86II::MRM_E0: case X86II::MRM_E1: case X86II::MRM_E2:
case X86II::MRM_E3: case X86II::MRM_E4: case X86II::MRM_E5:
case X86II::MRM_E8: case X86II::MRM_E9: case X86II::MRM_EA:
case X86II::MRM_EB: case X86II::MRM_EC: case X86II::MRM_ED:
case X86II::MRM_EE: case X86II::MRM_F0: case X86II::MRM_F1:
case X86II::MRM_F2: case X86II::MRM_F3: case X86II::MRM_F4:
case X86II::MRM_F5: case X86II::MRM_F6: case X86II::MRM_F7:
case X86II::MRM_F8: case X86II::MRM_F9: case X86II::MRM_FA:
case X86II::MRM_FB: case X86II::MRM_FC: case X86II::MRM_FD:
case X86II::MRM_FE: case X86II::MRM_FF:
MCE.emitByte(BaseOpcode);
unsigned char MRM;
switch (TSFlags & X86II::FormMask) {
default: llvm_unreachable("Invalid Form");
case X86II::MRM_C0: MRM = 0xC0; break;
case X86II::MRM_C1: MRM = 0xC1; break;
case X86II::MRM_C2: MRM = 0xC2; break;
case X86II::MRM_C3: MRM = 0xC3; break;
case X86II::MRM_C4: MRM = 0xC4; break;
case X86II::MRM_C8: MRM = 0xC8; break;
case X86II::MRM_C9: MRM = 0xC9; break;
case X86II::MRM_CA: MRM = 0xCA; break;
case X86II::MRM_CB: MRM = 0xCB; break;
case X86II::MRM_CF: MRM = 0xCF; break;
case X86II::MRM_D0: MRM = 0xD0; break;
case X86II::MRM_D1: MRM = 0xD1; break;
case X86II::MRM_D4: MRM = 0xD4; break;
case X86II::MRM_D5: MRM = 0xD5; break;
case X86II::MRM_D6: MRM = 0xD6; break;
case X86II::MRM_D7: MRM = 0xD7; break;
case X86II::MRM_D8: MRM = 0xD8; break;
case X86II::MRM_D9: MRM = 0xD9; break;
case X86II::MRM_DA: MRM = 0xDA; break;
case X86II::MRM_DB: MRM = 0xDB; break;
case X86II::MRM_DC: MRM = 0xDC; break;
case X86II::MRM_DD: MRM = 0xDD; break;
case X86II::MRM_DE: MRM = 0xDE; break;
case X86II::MRM_DF: MRM = 0xDF; break;
case X86II::MRM_E0: MRM = 0xE0; break;
case X86II::MRM_E1: MRM = 0xE1; break;
case X86II::MRM_E2: MRM = 0xE2; break;
case X86II::MRM_E3: MRM = 0xE3; break;
case X86II::MRM_E4: MRM = 0xE4; break;
case X86II::MRM_E5: MRM = 0xE5; break;
case X86II::MRM_E8: MRM = 0xE8; break;
case X86II::MRM_E9: MRM = 0xE9; break;
case X86II::MRM_EA: MRM = 0xEA; break;
case X86II::MRM_EB: MRM = 0xEB; break;
case X86II::MRM_EC: MRM = 0xEC; break;
case X86II::MRM_ED: MRM = 0xED; break;
case X86II::MRM_EE: MRM = 0xEE; break;
case X86II::MRM_F0: MRM = 0xF0; break;
case X86II::MRM_F1: MRM = 0xF1; break;
case X86II::MRM_F2: MRM = 0xF2; break;
case X86II::MRM_F3: MRM = 0xF3; break;
case X86II::MRM_F4: MRM = 0xF4; break;
case X86II::MRM_F5: MRM = 0xF5; break;
case X86II::MRM_F6: MRM = 0xF6; break;
case X86II::MRM_F7: MRM = 0xF7; break;
case X86II::MRM_F8: MRM = 0xF8; break;
case X86II::MRM_F9: MRM = 0xF9; break;
case X86II::MRM_FA: MRM = 0xFA; break;
case X86II::MRM_FB: MRM = 0xFB; break;
case X86II::MRM_FC: MRM = 0xFC; break;
case X86II::MRM_FD: MRM = 0xFD; break;
case X86II::MRM_FE: MRM = 0xFE; break;
case X86II::MRM_FF: MRM = 0xFF; break;
}
MCE.emitByte(MRM);
break;
}
while (CurOp != NumOps && NumOps - CurOp <= 2) {
if ((TSFlags >> X86II::VEXShift) & X86II::VEX_I8IMM) {
const MachineOperand &MO = MI.getOperand(HasMemOp4 ? MemOp4_I8IMMOperand
: CurOp);
++CurOp;
unsigned RegNum = getX86RegNum(MO.getReg()) << 4;
if (X86II::isX86_64ExtendedReg(MO.getReg()))
RegNum |= 1 << 7;
if (CurOp != NumOps) {
const MachineOperand &MIMM = MI.getOperand(CurOp++);
if (MIMM.isImm()) {
unsigned Val = MIMM.getImm();
assert(Val < 16 && "Immediate operand value out of range");
RegNum |= Val;
}
}
emitConstant(RegNum, 1);
} else {
emitConstant(MI.getOperand(CurOp++).getImm(),
X86II::getSizeOfImm(Desc->TSFlags));
}
}
if (!MI.isVariadic() && CurOp != NumOps) {
#ifndef NDEBUG
dbgs() << "Cannot encode all operands of: " << MI << "\n";
#endif
llvm_unreachable(nullptr);
}
MCE.processDebugLoc(MI.getDebugLoc(), false);
}