1 //===-- X86/X86CodeEmitter.cpp - Convert X86 code to machine code ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the pass that transforms the X86 machine instructions into
11 // actual executable machine code.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "jit"
16 #include "X86TargetMachine.h"
18 #include "llvm/PassManager.h"
19 #include "llvm/CodeGen/MachineCodeEmitter.h"
20 #include "llvm/CodeGen/MachineFunctionPass.h"
21 #include "llvm/CodeGen/MachineInstr.h"
22 #include "llvm/CodeGen/Passes.h"
23 #include "llvm/Function.h"
24 #include "Support/Debug.h"
25 #include "Support/Statistic.h"
26 #include "Config/alloca.h"
31 NumEmitted("x86-emitter", "Number of machine instructions emitted");
34 MachineCodeEmitter &MCE;
36 // LazyCodeGenMap - Keep track of call sites for functions that are to be
38 std::map<unsigned, Function*> LazyCodeGenMap;
40 // LazyResolverMap - Keep track of the lazy resolver created for a
41 // particular function so that we can reuse them if necessary.
42 std::map<Function*, unsigned> LazyResolverMap;
44 JITResolver(MachineCodeEmitter &mce) : MCE(mce) {}
45 unsigned getLazyResolver(Function *F);
46 unsigned addFunctionReference(unsigned Address, Function *F);
49 unsigned emitStubForFunction(Function *F);
50 static void CompilationCallback();
51 unsigned resolveFunctionReference(unsigned RetAddr);
54 static JITResolver &getResolver(MachineCodeEmitter &MCE) {
55 static JITResolver *TheJITResolver = 0;
56 if (TheJITResolver == 0)
57 TheJITResolver = new JITResolver(MCE);
58 return *TheJITResolver;
63 void *X86JITInfo::getJITStubForFunction(Function *F, MachineCodeEmitter &MCE) {
64 return (void*)((unsigned long)getResolver(MCE).getLazyResolver(F));
67 void X86JITInfo::replaceMachineCodeForFunction (void *Old, void *New) {
68 char *OldByte = (char *) Old;
69 *OldByte++ = 0xE9; // Emit JMP opcode.
70 int32_t *OldWord = (int32_t *) OldByte;
71 int32_t NewAddr = (intptr_t) New;
72 int32_t OldAddr = (intptr_t) OldWord;
73 *OldWord = NewAddr - OldAddr - 4; // Emit PC-relative addr of New code.
76 /// addFunctionReference - This method is called when we need to emit the
77 /// address of a function that has not yet been emitted, so we don't know the
78 /// address. Instead, we emit a call to the CompilationCallback method, and
79 /// keep track of where we are.
81 unsigned JITResolver::addFunctionReference(unsigned Address, Function *F) {
82 LazyCodeGenMap[Address] = F;
83 return (intptr_t)&JITResolver::CompilationCallback;
86 unsigned JITResolver::resolveFunctionReference(unsigned RetAddr) {
87 std::map<unsigned, Function*>::iterator I = LazyCodeGenMap.find(RetAddr);
88 assert(I != LazyCodeGenMap.end() && "Not in map!");
89 Function *F = I->second;
90 LazyCodeGenMap.erase(I);
91 return MCE.forceCompilationOf(F);
94 unsigned JITResolver::getLazyResolver(Function *F) {
95 std::map<Function*, unsigned>::iterator I = LazyResolverMap.lower_bound(F);
96 if (I != LazyResolverMap.end() && I->first == F) return I->second;
98 //std::cerr << "Getting lazy resolver for : " << ((Value*)F)->getName() << "\n";
100 unsigned Stub = emitStubForFunction(F);
101 LazyResolverMap.insert(I, std::make_pair(F, Stub));
105 void JITResolver::CompilationCallback() {
106 unsigned *StackPtr = (unsigned*)__builtin_frame_address(0);
107 unsigned RetAddr = (unsigned)(intptr_t)__builtin_return_address(0);
108 assert(StackPtr[1] == RetAddr &&
109 "Could not find return address on the stack!");
111 // It's a stub if there is an interrupt marker after the call...
112 bool isStub = ((unsigned char*)(intptr_t)RetAddr)[0] == 0xCD;
114 // FIXME FIXME FIXME FIXME: __builtin_frame_address doesn't work if frame
115 // pointer elimination has been performed. Having a variable sized alloca
116 // disables frame pointer elimination currently, even if it's dead. This is a
119 // FIXME FIXME FIXME FIXME
121 // The call instruction should have pushed the return value onto the stack...
122 RetAddr -= 4; // Backtrack to the reference itself...
125 DEBUG(std::cerr << "In callback! Addr=0x" << std::hex << RetAddr
126 << " ESP=0x" << (unsigned)StackPtr << std::dec
127 << ": Resolving call to function: "
128 << TheVM->getFunctionReferencedName((void*)RetAddr) << "\n");
131 // Sanity check to make sure this really is a call instruction...
132 assert(((unsigned char*)(intptr_t)RetAddr)[-1] == 0xE8 &&"Not a call instr!");
134 JITResolver &JR = getResolver(*(MachineCodeEmitter*)0);
135 unsigned NewVal = JR.resolveFunctionReference(RetAddr);
137 // Rewrite the call target... so that we don't fault every time we execute
139 *(unsigned*)(intptr_t)RetAddr = NewVal-RetAddr-4;
142 // If this is a stub, rewrite the call into an unconditional branch
143 // instruction so that two return addresses are not pushed onto the stack
144 // when the requested function finally gets called. This also makes the
145 // 0xCD byte (interrupt) dead, so the marker doesn't effect anything.
146 ((unsigned char*)(intptr_t)RetAddr)[-1] = 0xE9;
149 // Change the return address to reexecute the call instruction...
153 /// emitStubForFunction - This method is used by the JIT when it needs to emit
154 /// the address of a function for a function whose code has not yet been
155 /// generated. In order to do this, it generates a stub which jumps to the lazy
156 /// function compiler, which will eventually get fixed to call the function
159 unsigned JITResolver::emitStubForFunction(Function *F) {
160 MCE.startFunctionStub(*F, 6);
161 MCE.emitByte(0xE8); // Call with 32 bit pc-rel destination...
163 unsigned Address = addFunctionReference(MCE.getCurrentPCValue(), F);
164 MCE.emitWord(Address-MCE.getCurrentPCValue()-4);
166 MCE.emitByte(0xCD); // Interrupt - Just a marker identifying the stub!
167 return (intptr_t)MCE.finishFunctionStub(*F);
172 class Emitter : public MachineFunctionPass {
173 const X86InstrInfo *II;
174 MachineCodeEmitter &MCE;
175 std::map<const BasicBlock*, unsigned> BasicBlockAddrs;
176 std::vector<std::pair<const BasicBlock*, unsigned> > BBRefs;
178 explicit Emitter(MachineCodeEmitter &mce) : II(0), MCE(mce) {}
179 Emitter(MachineCodeEmitter &mce, const X86InstrInfo& ii)
180 : II(&ii), MCE(mce) {}
182 bool runOnMachineFunction(MachineFunction &MF);
184 virtual const char *getPassName() const {
185 return "X86 Machine Code Emitter";
188 void emitInstruction(const MachineInstr &MI);
191 void emitBasicBlock(const MachineBasicBlock &MBB);
193 void emitPCRelativeBlockAddress(const BasicBlock *BB);
194 void emitMaybePCRelativeValue(unsigned Address, bool isPCRelative);
195 void emitGlobalAddressForCall(GlobalValue *GV);
196 void emitGlobalAddressForPtr(GlobalValue *GV);
198 void emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeField);
199 void emitSIBByte(unsigned SS, unsigned Index, unsigned Base);
200 void emitConstant(unsigned Val, unsigned Size);
202 void emitMemModRMByte(const MachineInstr &MI,
203 unsigned Op, unsigned RegOpcodeField);
208 // This function is required by Printer.cpp to workaround gas bugs
209 void llvm::X86::emitInstruction(MachineCodeEmitter& mce,
210 const X86InstrInfo& ii,
211 const MachineInstr& mi)
213 Emitter(mce, ii).emitInstruction(mi);
216 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to get
217 /// machine code emitted. This uses a MachineCodeEmitter object to handle
218 /// actually outputting the machine code and resolving things like the address
219 /// of functions. This method should returns true if machine code emission is
222 bool X86TargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
223 MachineCodeEmitter &MCE) {
224 PM.add(new Emitter(MCE));
225 // Delete machine code for this function
226 PM.add(createMachineCodeDeleter());
230 bool Emitter::runOnMachineFunction(MachineFunction &MF) {
231 II = &((X86TargetMachine&)MF.getTarget()).getInstrInfo();
233 MCE.startFunction(MF);
234 MCE.emitConstantPool(MF.getConstantPool());
235 for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
237 MCE.finishFunction(MF);
239 // Resolve all forward branches now...
240 for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
241 unsigned Location = BasicBlockAddrs[BBRefs[i].first];
242 unsigned Ref = BBRefs[i].second;
243 *(unsigned*)(intptr_t)Ref = Location-Ref-4;
246 BasicBlockAddrs.clear();
250 void Emitter::emitBasicBlock(const MachineBasicBlock &MBB) {
251 if (uint64_t Addr = MCE.getCurrentPCValue())
252 BasicBlockAddrs[MBB.getBasicBlock()] = Addr;
254 for (MachineBasicBlock::const_iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
259 /// emitPCRelativeBlockAddress - This method emits the PC relative address of
260 /// the specified basic block, or if the basic block hasn't been emitted yet
261 /// (because this is a forward branch), it keeps track of the information
262 /// necessary to resolve this address later (and emits a dummy value).
264 void Emitter::emitPCRelativeBlockAddress(const BasicBlock *BB) {
265 // FIXME: Emit backward branches directly
266 BBRefs.push_back(std::make_pair(BB, MCE.getCurrentPCValue()));
267 MCE.emitWord(0); // Emit a dummy value
270 /// emitMaybePCRelativeValue - Emit a 32-bit address which may be PC relative.
272 void Emitter::emitMaybePCRelativeValue(unsigned Address, bool isPCRelative) {
274 MCE.emitWord(Address-MCE.getCurrentPCValue()-4);
276 MCE.emitWord(Address);
279 /// emitGlobalAddressForCall - Emit the specified address to the code stream
280 /// assuming this is part of a function call, which is PC relative.
282 void Emitter::emitGlobalAddressForCall(GlobalValue *GV) {
283 // Get the address from the backend...
284 unsigned Address = MCE.getGlobalValueAddress(GV);
287 // FIXME: this is JIT specific!
288 Address = getResolver(MCE).addFunctionReference(MCE.getCurrentPCValue(),
291 emitMaybePCRelativeValue(Address, true);
294 /// emitGlobalAddress - Emit the specified address to the code stream assuming
295 /// this is part of a "take the address of a global" instruction, which is not
298 void Emitter::emitGlobalAddressForPtr(GlobalValue *GV) {
299 // Get the address from the backend...
300 unsigned Address = MCE.getGlobalValueAddress(GV);
302 // If the machine code emitter doesn't know what the address IS yet, we have
303 // to take special measures.
306 // FIXME: this is JIT specific!
307 Address = getResolver(MCE).getLazyResolver((Function*)GV);
310 emitMaybePCRelativeValue(Address, false);
315 /// N86 namespace - Native X86 Register numbers... used by X86 backend.
319 EAX = 0, ECX = 1, EDX = 2, EBX = 3, ESP = 4, EBP = 5, ESI = 6, EDI = 7
324 // getX86RegNum - This function maps LLVM register identifiers to their X86
325 // specific numbering, which is used in various places encoding instructions.
327 static unsigned getX86RegNum(unsigned RegNo) {
329 case X86::EAX: case X86::AX: case X86::AL: return N86::EAX;
330 case X86::ECX: case X86::CX: case X86::CL: return N86::ECX;
331 case X86::EDX: case X86::DX: case X86::DL: return N86::EDX;
332 case X86::EBX: case X86::BX: case X86::BL: return N86::EBX;
333 case X86::ESP: case X86::SP: case X86::AH: return N86::ESP;
334 case X86::EBP: case X86::BP: case X86::CH: return N86::EBP;
335 case X86::ESI: case X86::SI: case X86::DH: return N86::ESI;
336 case X86::EDI: case X86::DI: case X86::BH: return N86::EDI;
338 case X86::ST0: case X86::ST1: case X86::ST2: case X86::ST3:
339 case X86::ST4: case X86::ST5: case X86::ST6: case X86::ST7:
340 return RegNo-X86::ST0;
342 assert(MRegisterInfo::isVirtualRegister(RegNo) &&
343 "Unknown physical register!");
344 assert(0 && "Register allocator hasn't allocated reg correctly yet!");
349 inline static unsigned char ModRMByte(unsigned Mod, unsigned RegOpcode,
351 assert(Mod < 4 && RegOpcode < 8 && RM < 8 && "ModRM Fields out of range!");
352 return RM | (RegOpcode << 3) | (Mod << 6);
355 void Emitter::emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeFld){
356 MCE.emitByte(ModRMByte(3, RegOpcodeFld, getX86RegNum(ModRMReg)));
359 void Emitter::emitSIBByte(unsigned SS, unsigned Index, unsigned Base) {
360 // SIB byte is in the same format as the ModRMByte...
361 MCE.emitByte(ModRMByte(SS, Index, Base));
364 void Emitter::emitConstant(unsigned Val, unsigned Size) {
365 // Output the constant in little endian byte order...
366 for (unsigned i = 0; i != Size; ++i) {
367 MCE.emitByte(Val & 255);
372 static bool isDisp8(int Value) {
373 return Value == (signed char)Value;
376 void Emitter::emitMemModRMByte(const MachineInstr &MI,
377 unsigned Op, unsigned RegOpcodeField) {
378 const MachineOperand &Disp = MI.getOperand(Op+3);
379 if (MI.getOperand(Op).isConstantPoolIndex()) {
380 // Emit a direct address reference [disp32] where the displacement of the
381 // constant pool entry is controlled by the MCE.
382 MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
383 unsigned Index = MI.getOperand(Op).getConstantPoolIndex();
384 unsigned Address = MCE.getConstantPoolEntryAddress(Index);
385 MCE.emitWord(Address+Disp.getImmedValue());
389 const MachineOperand &BaseReg = MI.getOperand(Op);
390 const MachineOperand &Scale = MI.getOperand(Op+1);
391 const MachineOperand &IndexReg = MI.getOperand(Op+2);
393 // Is a SIB byte needed?
394 if (IndexReg.getReg() == 0 && BaseReg.getReg() != X86::ESP) {
395 if (BaseReg.getReg() == 0) { // Just a displacement?
396 // Emit special case [disp32] encoding
397 MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
398 emitConstant(Disp.getImmedValue(), 4);
400 unsigned BaseRegNo = getX86RegNum(BaseReg.getReg());
401 if (Disp.getImmedValue() == 0 && BaseRegNo != N86::EBP) {
402 // Emit simple indirect register encoding... [EAX] f.e.
403 MCE.emitByte(ModRMByte(0, RegOpcodeField, BaseRegNo));
404 } else if (isDisp8(Disp.getImmedValue())) {
405 // Emit the disp8 encoding... [REG+disp8]
406 MCE.emitByte(ModRMByte(1, RegOpcodeField, BaseRegNo));
407 emitConstant(Disp.getImmedValue(), 1);
409 // Emit the most general non-SIB encoding: [REG+disp32]
410 MCE.emitByte(ModRMByte(2, RegOpcodeField, BaseRegNo));
411 emitConstant(Disp.getImmedValue(), 4);
415 } else { // We need a SIB byte, so start by outputting the ModR/M byte first
416 assert(IndexReg.getReg() != X86::ESP && "Cannot use ESP as index reg!");
418 bool ForceDisp32 = false;
419 bool ForceDisp8 = false;
420 if (BaseReg.getReg() == 0) {
421 // If there is no base register, we emit the special case SIB byte with
422 // MOD=0, BASE=5, to JUST get the index, scale, and displacement.
423 MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
425 } else if (Disp.getImmedValue() == 0 && BaseReg.getReg() != X86::EBP) {
426 // Emit no displacement ModR/M byte
427 MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
428 } else if (isDisp8(Disp.getImmedValue())) {
429 // Emit the disp8 encoding...
430 MCE.emitByte(ModRMByte(1, RegOpcodeField, 4));
431 ForceDisp8 = true; // Make sure to force 8 bit disp if Base=EBP
433 // Emit the normal disp32 encoding...
434 MCE.emitByte(ModRMByte(2, RegOpcodeField, 4));
437 // Calculate what the SS field value should be...
438 static const unsigned SSTable[] = { ~0, 0, 1, ~0, 2, ~0, ~0, ~0, 3 };
439 unsigned SS = SSTable[Scale.getImmedValue()];
441 if (BaseReg.getReg() == 0) {
442 // Handle the SIB byte for the case where there is no base. The
443 // displacement has already been output.
444 assert(IndexReg.getReg() && "Index register must be specified!");
445 emitSIBByte(SS, getX86RegNum(IndexReg.getReg()), 5);
447 unsigned BaseRegNo = getX86RegNum(BaseReg.getReg());
449 if (IndexReg.getReg())
450 IndexRegNo = getX86RegNum(IndexReg.getReg());
452 IndexRegNo = 4; // For example [ESP+1*<noreg>+4]
453 emitSIBByte(SS, IndexRegNo, BaseRegNo);
456 // Do we need to output a displacement?
457 if (Disp.getImmedValue() != 0 || ForceDisp32 || ForceDisp8) {
458 if (!ForceDisp32 && isDisp8(Disp.getImmedValue()))
459 emitConstant(Disp.getImmedValue(), 1);
461 emitConstant(Disp.getImmedValue(), 4);
466 static unsigned sizeOfImm(const TargetInstrDescriptor &Desc) {
467 switch (Desc.TSFlags & X86II::ImmMask) {
468 case X86II::Imm8: return 1;
469 case X86II::Imm16: return 2;
470 case X86II::Imm32: return 4;
471 default: assert(0 && "Immediate size not set!");
476 static unsigned sizeOfPtr(const TargetInstrDescriptor &Desc) {
477 switch (Desc.TSFlags & X86II::MemMask) {
478 case X86II::Mem8: return 1;
479 case X86II::Mem16: return 2;
480 case X86II::Mem32: return 4;
481 case X86II::Mem64: return 8;
482 case X86II::Mem80: return 10;
483 case X86II::Mem128: return 16;
484 default: assert(0 && "Memory size not set!");
489 void Emitter::emitInstruction(const MachineInstr &MI) {
490 NumEmitted++; // Keep track of the # of mi's emitted
492 unsigned Opcode = MI.getOpcode();
493 const TargetInstrDescriptor &Desc = II->get(Opcode);
495 // Emit the repeat opcode prefix as needed.
496 if ((Desc.TSFlags & X86II::Op0Mask) == X86II::REP) MCE.emitByte(0xF3);
498 // Emit instruction prefixes if necessary
499 if (Desc.TSFlags & X86II::OpSize) MCE.emitByte(0x66);// Operand size...
501 switch (Desc.TSFlags & X86II::Op0Mask) {
503 MCE.emitByte(0x0F); // Two-byte opcode prefix
505 case X86II::REP: break; // already handled.
506 case X86II::D8: case X86II::D9: case X86II::DA: case X86II::DB:
507 case X86II::DC: case X86II::DD: case X86II::DE: case X86II::DF:
509 (((Desc.TSFlags & X86II::Op0Mask)-X86II::D8)
510 >> X86II::Op0Shift));
511 break; // Two-byte opcode prefix
512 default: assert(0 && "Invalid prefix!");
513 case 0: break; // No prefix!
516 unsigned char BaseOpcode = II->getBaseOpcodeFor(Opcode);
517 switch (Desc.TSFlags & X86II::FormMask) {
518 default: assert(0 && "Unknown FormMask value in X86 MachineCodeEmitter!");
520 if (Opcode != X86::IMPLICIT_USE &&
521 Opcode != X86::IMPLICIT_DEF &&
522 Opcode != X86::FP_REG_KILL)
523 std::cerr << "X86 Machine Code Emitter: No 'form', not emitting: " << MI;
527 MCE.emitByte(BaseOpcode);
528 if (MI.getNumOperands() == 1) {
529 const MachineOperand &MO = MI.getOperand(0);
530 if (MO.isPCRelativeDisp()) {
531 // Conditional branch... FIXME: this should use an MBB destination!
532 emitPCRelativeBlockAddress(cast<BasicBlock>(MO.getVRegValue()));
533 } else if (MO.isGlobalAddress()) {
534 assert(MO.isPCRelative() && "Call target is not PC Relative?");
535 emitGlobalAddressForCall(MO.getGlobal());
536 } else if (MO.isExternalSymbol()) {
537 unsigned Address = MCE.getGlobalValueAddress(MO.getSymbolName());
538 assert(Address && "Unknown external symbol!");
539 emitMaybePCRelativeValue(Address, MO.isPCRelative());
540 } else if (MO.isImmediate()) {
541 emitConstant(MO.getImmedValue(), sizeOfImm(Desc));
543 assert(0 && "Unknown RawFrm operand!");
548 case X86II::AddRegFrm:
549 MCE.emitByte(BaseOpcode + getX86RegNum(MI.getOperand(0).getReg()));
550 if (MI.getNumOperands() == 2) {
551 const MachineOperand &MO1 = MI.getOperand(1);
552 if (Value *V = MO1.getVRegValueOrNull()) {
553 assert(sizeOfImm(Desc) == 4 && "Don't know how to emit non-pointer values!");
554 emitGlobalAddressForPtr(cast<GlobalValue>(V));
555 } else if (MO1.isGlobalAddress()) {
556 assert(sizeOfImm(Desc) == 4 && "Don't know how to emit non-pointer values!");
557 assert(!MO1.isPCRelative() && "Function pointer ref is PC relative?");
558 emitGlobalAddressForPtr(MO1.getGlobal());
559 } else if (MO1.isExternalSymbol()) {
560 assert(sizeOfImm(Desc) == 4 && "Don't know how to emit non-pointer values!");
562 unsigned Address = MCE.getGlobalValueAddress(MO1.getSymbolName());
563 assert(Address && "Unknown external symbol!");
564 emitMaybePCRelativeValue(Address, MO1.isPCRelative());
566 emitConstant(MO1.getImmedValue(), sizeOfImm(Desc));
571 case X86II::MRMDestReg: {
572 MCE.emitByte(BaseOpcode);
573 emitRegModRMByte(MI.getOperand(0).getReg(),
574 getX86RegNum(MI.getOperand(1).getReg()));
575 if (MI.getNumOperands() == 3)
576 emitConstant(MI.getOperand(2).getImmedValue(), sizeOfImm(Desc));
579 case X86II::MRMDestMem:
580 MCE.emitByte(BaseOpcode);
581 emitMemModRMByte(MI, 0, getX86RegNum(MI.getOperand(4).getReg()));
584 case X86II::MRMSrcReg:
585 MCE.emitByte(BaseOpcode);
587 emitRegModRMByte(MI.getOperand(1).getReg(),
588 getX86RegNum(MI.getOperand(0).getReg()));
589 if (MI.getNumOperands() == 3)
590 emitConstant(MI.getOperand(2).getImmedValue(), sizeOfImm(Desc));
593 case X86II::MRMSrcMem:
594 MCE.emitByte(BaseOpcode);
595 emitMemModRMByte(MI, 1, getX86RegNum(MI.getOperand(0).getReg()));
596 if (MI.getNumOperands() == 2+4)
597 emitConstant(MI.getOperand(5).getImmedValue(), sizeOfImm(Desc));
600 case X86II::MRM0r: case X86II::MRM1r:
601 case X86II::MRM2r: case X86II::MRM3r:
602 case X86II::MRM4r: case X86II::MRM5r:
603 case X86II::MRM6r: case X86II::MRM7r:
604 MCE.emitByte(BaseOpcode);
605 emitRegModRMByte(MI.getOperand(0).getReg(),
606 (Desc.TSFlags & X86II::FormMask)-X86II::MRM0r);
608 if (MI.getOperand(MI.getNumOperands()-1).isImmediate()) {
609 emitConstant(MI.getOperand(MI.getNumOperands()-1).getImmedValue(), sizeOfImm(Desc));
613 case X86II::MRM0m: case X86II::MRM1m:
614 case X86II::MRM2m: case X86II::MRM3m:
615 case X86II::MRM4m: case X86II::MRM5m:
616 case X86II::MRM6m: case X86II::MRM7m:
617 MCE.emitByte(BaseOpcode);
618 emitMemModRMByte(MI, 0, (Desc.TSFlags & X86II::FormMask)-X86II::MRM0m);
620 if (MI.getNumOperands() == 5) {
621 if (MI.getOperand(4).isImmediate())
622 emitConstant(MI.getOperand(4).getImmedValue(), sizeOfImm(Desc));
623 else if (MI.getOperand(4).isGlobalAddress())
624 emitGlobalAddressForPtr(MI.getOperand(4).getGlobal());
626 assert(0 && "Unknown operand!");