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 "llvm/Support/Debug.h"
25 #include "llvm/ADT/Statistic.h"
26 #include "llvm/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));
106 #pragma optimize("y", off)
109 void JITResolver::CompilationCallback() {
111 unsigned *StackPtr, RetAddr;
112 __asm mov StackPtr, ebp;
113 __asm mov eax, DWORD PTR [ebp + 4];
114 __asm mov RetAddr, eax;
116 unsigned *StackPtr = (unsigned*)__builtin_frame_address(0);
117 unsigned RetAddr = (unsigned)(intptr_t)__builtin_return_address(0);
119 assert(StackPtr[1] == RetAddr &&
120 "Could not find return address on the stack!");
122 // It's a stub if there is an interrupt marker after the call...
123 bool isStub = ((unsigned char*)(intptr_t)RetAddr)[0] == 0xCD;
126 // FIXME FIXME FIXME FIXME: __builtin_frame_address doesn't work if frame
127 // pointer elimination has been performed. Having a variable sized alloca
128 // disables frame pointer elimination currently, even if it's dead. This is a
131 // FIXME FIXME FIXME FIXME
134 // The call instruction should have pushed the return value onto the stack...
135 RetAddr -= 4; // Backtrack to the reference itself...
138 DEBUG(std::cerr << "In callback! Addr=0x" << std::hex << RetAddr
139 << " ESP=0x" << (unsigned)StackPtr << std::dec
140 << ": Resolving call to function: "
141 << TheVM->getFunctionReferencedName((void*)RetAddr) << "\n");
144 // Sanity check to make sure this really is a call instruction...
145 assert(((unsigned char*)(intptr_t)RetAddr)[-1] == 0xE8 &&"Not a call instr!");
147 JITResolver &JR = getResolver(*(MachineCodeEmitter*)0);
148 unsigned NewVal = JR.resolveFunctionReference(RetAddr);
150 // Rewrite the call target... so that we don't fault every time we execute
152 *(unsigned*)(intptr_t)RetAddr = NewVal-RetAddr-4;
155 // If this is a stub, rewrite the call into an unconditional branch
156 // instruction so that two return addresses are not pushed onto the stack
157 // when the requested function finally gets called. This also makes the
158 // 0xCD byte (interrupt) dead, so the marker doesn't effect anything.
159 ((unsigned char*)(intptr_t)RetAddr)[-1] = 0xE9;
162 // Change the return address to reexecute the call instruction...
167 #pragma optimize( "", on )
170 /// emitStubForFunction - This method is used by the JIT when it needs to emit
171 /// the address of a function for a function whose code has not yet been
172 /// generated. In order to do this, it generates a stub which jumps to the lazy
173 /// function compiler, which will eventually get fixed to call the function
176 unsigned JITResolver::emitStubForFunction(Function *F) {
177 MCE.startFunctionStub(*F, 6);
178 MCE.emitByte(0xE8); // Call with 32 bit pc-rel destination...
180 unsigned Address = addFunctionReference(MCE.getCurrentPCValue(), F);
181 MCE.emitWord(Address-MCE.getCurrentPCValue()-4);
183 MCE.emitByte(0xCD); // Interrupt - Just a marker identifying the stub!
184 return (intptr_t)MCE.finishFunctionStub(*F);
189 class Emitter : public MachineFunctionPass {
190 const X86InstrInfo *II;
191 MachineCodeEmitter &MCE;
192 std::map<const MachineBasicBlock*, unsigned> BasicBlockAddrs;
193 std::vector<std::pair<const MachineBasicBlock *, unsigned> > BBRefs;
195 explicit Emitter(MachineCodeEmitter &mce) : II(0), MCE(mce) {}
196 Emitter(MachineCodeEmitter &mce, const X86InstrInfo& ii)
197 : II(&ii), MCE(mce) {}
199 bool runOnMachineFunction(MachineFunction &MF);
201 virtual const char *getPassName() const {
202 return "X86 Machine Code Emitter";
205 void emitInstruction(const MachineInstr &MI);
208 void emitBasicBlock(const MachineBasicBlock &MBB);
210 void emitPCRelativeBlockAddress(const MachineBasicBlock *BB);
211 void emitMaybePCRelativeValue(unsigned Address, bool isPCRelative);
212 void emitGlobalAddressForCall(GlobalValue *GV);
213 void emitGlobalAddressForPtr(GlobalValue *GV, int Disp = 0);
215 void emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeField);
216 void emitSIBByte(unsigned SS, unsigned Index, unsigned Base);
217 void emitConstant(unsigned Val, unsigned Size);
219 void emitMemModRMByte(const MachineInstr &MI,
220 unsigned Op, unsigned RegOpcodeField);
225 // This function is required by X86AsmPrinter.cpp to work around GAS bugs
226 void llvm::X86::emitInstruction(MachineCodeEmitter& mce,
227 const X86InstrInfo& ii,
228 const MachineInstr& mi)
230 Emitter(mce, ii).emitInstruction(mi);
233 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to get
234 /// machine code emitted. This uses a MachineCodeEmitter object to handle
235 /// actually outputting the machine code and resolving things like the address
236 /// of functions. This method should returns true if machine code emission is
239 bool X86TargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
240 MachineCodeEmitter &MCE) {
241 PM.add(new Emitter(MCE));
242 // Delete machine code for this function
243 PM.add(createMachineCodeDeleter());
247 bool Emitter::runOnMachineFunction(MachineFunction &MF) {
248 II = ((X86TargetMachine&)MF.getTarget()).getInstrInfo();
250 MCE.startFunction(MF);
251 MCE.emitConstantPool(MF.getConstantPool());
252 for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
254 MCE.finishFunction(MF);
256 // Resolve all forward branches now...
257 for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
258 unsigned Location = BasicBlockAddrs[BBRefs[i].first];
259 unsigned Ref = BBRefs[i].second;
260 MCE.emitWordAt (Location-Ref-4, (unsigned*)(intptr_t)Ref);
263 BasicBlockAddrs.clear();
267 void Emitter::emitBasicBlock(const MachineBasicBlock &MBB) {
268 if (uint64_t Addr = MCE.getCurrentPCValue())
269 BasicBlockAddrs[&MBB] = Addr;
271 for (MachineBasicBlock::const_iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
275 /// emitPCRelativeBlockAddress - This method emits the PC relative address of
276 /// the specified basic block, or if the basic block hasn't been emitted yet
277 /// (because this is a forward branch), it keeps track of the information
278 /// necessary to resolve this address later (and emits a dummy value).
280 void Emitter::emitPCRelativeBlockAddress(const MachineBasicBlock *MBB) {
281 // FIXME: Emit backward branches directly
282 BBRefs.push_back(std::make_pair(MBB, MCE.getCurrentPCValue()));
286 /// emitMaybePCRelativeValue - Emit a 32-bit address which may be PC relative.
288 void Emitter::emitMaybePCRelativeValue(unsigned Address, bool isPCRelative) {
290 MCE.emitWord(Address-MCE.getCurrentPCValue()-4);
292 MCE.emitWord(Address);
295 /// emitGlobalAddressForCall - Emit the specified address to the code stream
296 /// assuming this is part of a function call, which is PC relative.
298 void Emitter::emitGlobalAddressForCall(GlobalValue *GV) {
299 // Get the address from the backend...
300 unsigned Address = MCE.getGlobalValueAddress(GV);
303 // FIXME: this is JIT specific!
304 Address = getResolver(MCE).addFunctionReference(MCE.getCurrentPCValue(),
307 emitMaybePCRelativeValue(Address, true);
310 /// emitGlobalAddress - Emit the specified address to the code stream assuming
311 /// this is part of a "take the address of a global" instruction, which is not
314 void Emitter::emitGlobalAddressForPtr(GlobalValue *GV, int Disp /* = 0 */) {
315 // Get the address from the backend...
316 unsigned Address = MCE.getGlobalValueAddress(GV);
318 // If the machine code emitter doesn't know what the address IS yet, we have
319 // to take special measures.
322 // FIXME: this is JIT specific!
323 Address = getResolver(MCE).getLazyResolver((Function*)GV);
326 emitMaybePCRelativeValue(Address + Disp, false);
331 /// N86 namespace - Native X86 Register numbers... used by X86 backend.
335 EAX = 0, ECX = 1, EDX = 2, EBX = 3, ESP = 4, EBP = 5, ESI = 6, EDI = 7
340 // getX86RegNum - This function maps LLVM register identifiers to their X86
341 // specific numbering, which is used in various places encoding instructions.
343 static unsigned getX86RegNum(unsigned RegNo) {
345 case X86::EAX: case X86::AX: case X86::AL: return N86::EAX;
346 case X86::ECX: case X86::CX: case X86::CL: return N86::ECX;
347 case X86::EDX: case X86::DX: case X86::DL: return N86::EDX;
348 case X86::EBX: case X86::BX: case X86::BL: return N86::EBX;
349 case X86::ESP: case X86::SP: case X86::AH: return N86::ESP;
350 case X86::EBP: case X86::BP: case X86::CH: return N86::EBP;
351 case X86::ESI: case X86::SI: case X86::DH: return N86::ESI;
352 case X86::EDI: case X86::DI: case X86::BH: return N86::EDI;
354 case X86::ST0: case X86::ST1: case X86::ST2: case X86::ST3:
355 case X86::ST4: case X86::ST5: case X86::ST6: case X86::ST7:
356 return RegNo-X86::ST0;
358 assert(MRegisterInfo::isVirtualRegister(RegNo) &&
359 "Unknown physical register!");
360 assert(0 && "Register allocator hasn't allocated reg correctly yet!");
365 inline static unsigned char ModRMByte(unsigned Mod, unsigned RegOpcode,
367 assert(Mod < 4 && RegOpcode < 8 && RM < 8 && "ModRM Fields out of range!");
368 return RM | (RegOpcode << 3) | (Mod << 6);
371 void Emitter::emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeFld){
372 MCE.emitByte(ModRMByte(3, RegOpcodeFld, getX86RegNum(ModRMReg)));
375 void Emitter::emitSIBByte(unsigned SS, unsigned Index, unsigned Base) {
376 // SIB byte is in the same format as the ModRMByte...
377 MCE.emitByte(ModRMByte(SS, Index, Base));
380 void Emitter::emitConstant(unsigned Val, unsigned Size) {
381 // Output the constant in little endian byte order...
382 for (unsigned i = 0; i != Size; ++i) {
383 MCE.emitByte(Val & 255);
388 static bool isDisp8(int Value) {
389 return Value == (signed char)Value;
392 void Emitter::emitMemModRMByte(const MachineInstr &MI,
393 unsigned Op, unsigned RegOpcodeField) {
394 const MachineOperand &Op3 = MI.getOperand(Op+3);
398 if (Op3.isGlobalAddress()) {
399 GV = Op3.getGlobal();
400 DispVal = Op3.getOffset();
402 DispVal = Op3.getImmedValue();
405 const MachineOperand &Base = MI.getOperand(Op);
406 const MachineOperand &Scale = MI.getOperand(Op+1);
407 const MachineOperand &IndexReg = MI.getOperand(Op+2);
409 unsigned BaseReg = 0;
411 if (Base.isConstantPoolIndex()) {
412 // Emit a direct address reference [disp32] where the displacement of the
413 // constant pool entry is controlled by the MCE.
414 assert(!GV && "Constant Pool reference cannot be relative to global!");
415 DispVal += MCE.getConstantPoolEntryAddress(Base.getConstantPoolIndex());
417 BaseReg = Base.getReg();
420 // Is a SIB byte needed?
421 if (IndexReg.getReg() == 0 && BaseReg != X86::ESP) {
422 if (BaseReg == 0) { // Just a displacement?
423 // Emit special case [disp32] encoding
424 MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
426 emitGlobalAddressForPtr(GV, DispVal);
428 emitConstant(DispVal, 4);
430 unsigned BaseRegNo = getX86RegNum(BaseReg);
432 // Emit the most general non-SIB encoding: [REG+disp32]
433 MCE.emitByte(ModRMByte(2, RegOpcodeField, BaseRegNo));
434 emitGlobalAddressForPtr(GV, DispVal);
435 } else if (DispVal == 0 && BaseRegNo != N86::EBP) {
436 // Emit simple indirect register encoding... [EAX] f.e.
437 MCE.emitByte(ModRMByte(0, RegOpcodeField, BaseRegNo));
438 } else if (isDisp8(DispVal)) {
439 // Emit the disp8 encoding... [REG+disp8]
440 MCE.emitByte(ModRMByte(1, RegOpcodeField, BaseRegNo));
441 emitConstant(DispVal, 1);
443 // Emit the most general non-SIB encoding: [REG+disp32]
444 MCE.emitByte(ModRMByte(2, RegOpcodeField, BaseRegNo));
445 emitConstant(DispVal, 4);
449 } else { // We need a SIB byte, so start by outputting the ModR/M byte first
450 assert(IndexReg.getReg() != X86::ESP && "Cannot use ESP as index reg!");
452 bool ForceDisp32 = false;
453 bool ForceDisp8 = false;
455 // If there is no base register, we emit the special case SIB byte with
456 // MOD=0, BASE=5, to JUST get the index, scale, and displacement.
457 MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
460 // Emit the normal disp32 encoding...
461 MCE.emitByte(ModRMByte(2, RegOpcodeField, 4));
463 } else if (DispVal == 0 && BaseReg != X86::EBP) {
464 // Emit no displacement ModR/M byte
465 MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
466 } else if (isDisp8(DispVal)) {
467 // Emit the disp8 encoding...
468 MCE.emitByte(ModRMByte(1, RegOpcodeField, 4));
469 ForceDisp8 = true; // Make sure to force 8 bit disp if Base=EBP
471 // Emit the normal disp32 encoding...
472 MCE.emitByte(ModRMByte(2, RegOpcodeField, 4));
475 // Calculate what the SS field value should be...
476 static const unsigned SSTable[] = { ~0, 0, 1, ~0, 2, ~0, ~0, ~0, 3 };
477 unsigned SS = SSTable[Scale.getImmedValue()];
480 // Handle the SIB byte for the case where there is no base. The
481 // displacement has already been output.
482 assert(IndexReg.getReg() && "Index register must be specified!");
483 emitSIBByte(SS, getX86RegNum(IndexReg.getReg()), 5);
485 unsigned BaseRegNo = getX86RegNum(BaseReg);
487 if (IndexReg.getReg())
488 IndexRegNo = getX86RegNum(IndexReg.getReg());
490 IndexRegNo = 4; // For example [ESP+1*<noreg>+4]
491 emitSIBByte(SS, IndexRegNo, BaseRegNo);
494 // Do we need to output a displacement?
495 if (DispVal != 0 || ForceDisp32 || ForceDisp8) {
496 if (!ForceDisp32 && isDisp8(DispVal))
497 emitConstant(DispVal, 1);
499 emitGlobalAddressForPtr(GV, DispVal);
501 emitConstant(DispVal, 4);
506 static unsigned sizeOfImm(const TargetInstrDescriptor &Desc) {
507 switch (Desc.TSFlags & X86II::ImmMask) {
508 case X86II::Imm8: return 1;
509 case X86II::Imm16: return 2;
510 case X86II::Imm32: return 4;
511 default: assert(0 && "Immediate size not set!");
516 void Emitter::emitInstruction(const MachineInstr &MI) {
517 NumEmitted++; // Keep track of the # of mi's emitted
519 unsigned Opcode = MI.getOpcode();
520 const TargetInstrDescriptor &Desc = II->get(Opcode);
522 // Emit the repeat opcode prefix as needed.
523 if ((Desc.TSFlags & X86II::Op0Mask) == X86II::REP) MCE.emitByte(0xF3);
525 // Emit instruction prefixes if necessary
526 if (Desc.TSFlags & X86II::OpSize) MCE.emitByte(0x66);// Operand size...
528 switch (Desc.TSFlags & X86II::Op0Mask) {
530 MCE.emitByte(0x0F); // Two-byte opcode prefix
532 case X86II::REP: break; // already handled.
533 case X86II::D8: case X86II::D9: case X86II::DA: case X86II::DB:
534 case X86II::DC: case X86II::DD: case X86II::DE: case X86II::DF:
536 (((Desc.TSFlags & X86II::Op0Mask)-X86II::D8)
537 >> X86II::Op0Shift));
538 break; // Two-byte opcode prefix
539 default: assert(0 && "Invalid prefix!");
540 case 0: break; // No prefix!
543 unsigned char BaseOpcode = II->getBaseOpcodeFor(Opcode);
544 switch (Desc.TSFlags & X86II::FormMask) {
545 default: assert(0 && "Unknown FormMask value in X86 MachineCodeEmitter!");
547 if (Opcode != X86::IMPLICIT_USE &&
548 Opcode != X86::IMPLICIT_DEF &&
549 Opcode != X86::FP_REG_KILL)
550 std::cerr << "X86 Machine Code Emitter: No 'form', not emitting: " << MI;
554 MCE.emitByte(BaseOpcode);
555 if (MI.getNumOperands() == 1) {
556 const MachineOperand &MO = MI.getOperand(0);
557 if (MO.isMachineBasicBlock()) {
558 emitPCRelativeBlockAddress(MO.getMachineBasicBlock());
559 } else if (MO.isGlobalAddress()) {
560 assert(MO.isPCRelative() && "Call target is not PC Relative?");
561 emitGlobalAddressForCall(MO.getGlobal());
562 } else if (MO.isExternalSymbol()) {
563 unsigned Address = MCE.getGlobalValueAddress(MO.getSymbolName());
564 assert(Address && "Unknown external symbol!");
565 emitMaybePCRelativeValue(Address, MO.isPCRelative());
566 } else if (MO.isImmediate()) {
567 emitConstant(MO.getImmedValue(), sizeOfImm(Desc));
569 assert(0 && "Unknown RawFrm operand!");
574 case X86II::AddRegFrm:
575 MCE.emitByte(BaseOpcode + getX86RegNum(MI.getOperand(0).getReg()));
576 if (MI.getNumOperands() == 2) {
577 const MachineOperand &MO1 = MI.getOperand(1);
578 if (Value *V = MO1.getVRegValueOrNull()) {
579 assert(sizeOfImm(Desc) == 4 &&
580 "Don't know how to emit non-pointer values!");
581 emitGlobalAddressForPtr(cast<GlobalValue>(V));
582 } else if (MO1.isGlobalAddress()) {
583 assert(sizeOfImm(Desc) == 4 &&
584 "Don't know how to emit non-pointer values!");
585 assert(!MO1.isPCRelative() && "Function pointer ref is PC relative?");
586 emitGlobalAddressForPtr(MO1.getGlobal(), MO1.getOffset());
587 } else if (MO1.isExternalSymbol()) {
588 assert(sizeOfImm(Desc) == 4 &&
589 "Don't know how to emit non-pointer values!");
590 unsigned Address = MCE.getGlobalValueAddress(MO1.getSymbolName());
591 assert(Address && "Unknown external symbol!");
592 emitMaybePCRelativeValue(Address, MO1.isPCRelative());
594 emitConstant(MO1.getImmedValue(), sizeOfImm(Desc));
599 case X86II::MRMDestReg: {
600 MCE.emitByte(BaseOpcode);
601 emitRegModRMByte(MI.getOperand(0).getReg(),
602 getX86RegNum(MI.getOperand(1).getReg()));
603 if (MI.getNumOperands() == 3)
604 emitConstant(MI.getOperand(2).getImmedValue(), sizeOfImm(Desc));
607 case X86II::MRMDestMem:
608 MCE.emitByte(BaseOpcode);
609 emitMemModRMByte(MI, 0, getX86RegNum(MI.getOperand(4).getReg()));
610 if (MI.getNumOperands() == 6)
611 emitConstant(MI.getOperand(5).getImmedValue(), sizeOfImm(Desc));
614 case X86II::MRMSrcReg:
615 MCE.emitByte(BaseOpcode);
617 emitRegModRMByte(MI.getOperand(1).getReg(),
618 getX86RegNum(MI.getOperand(0).getReg()));
619 if (MI.getNumOperands() == 3)
620 emitConstant(MI.getOperand(2).getImmedValue(), sizeOfImm(Desc));
623 case X86II::MRMSrcMem:
624 MCE.emitByte(BaseOpcode);
625 emitMemModRMByte(MI, 1, getX86RegNum(MI.getOperand(0).getReg()));
626 if (MI.getNumOperands() == 2+4)
627 emitConstant(MI.getOperand(5).getImmedValue(), sizeOfImm(Desc));
630 case X86II::MRM0r: case X86II::MRM1r:
631 case X86II::MRM2r: case X86II::MRM3r:
632 case X86II::MRM4r: case X86II::MRM5r:
633 case X86II::MRM6r: case X86II::MRM7r:
634 MCE.emitByte(BaseOpcode);
635 emitRegModRMByte(MI.getOperand(0).getReg(),
636 (Desc.TSFlags & X86II::FormMask)-X86II::MRM0r);
638 if (MI.getOperand(MI.getNumOperands()-1).isImmediate()) {
639 emitConstant(MI.getOperand(MI.getNumOperands()-1).getImmedValue(), sizeOfImm(Desc));
643 case X86II::MRM0m: case X86II::MRM1m:
644 case X86II::MRM2m: case X86II::MRM3m:
645 case X86II::MRM4m: case X86II::MRM5m:
646 case X86II::MRM6m: case X86II::MRM7m:
647 MCE.emitByte(BaseOpcode);
648 emitMemModRMByte(MI, 0, (Desc.TSFlags & X86II::FormMask)-X86II::MRM0m);
650 if (MI.getNumOperands() == 5) {
651 if (MI.getOperand(4).isImmediate())
652 emitConstant(MI.getOperand(4).getImmedValue(), sizeOfImm(Desc));
653 else if (MI.getOperand(4).isGlobalAddress())
654 emitGlobalAddressForPtr(MI.getOperand(4).getGlobal(),
655 MI.getOperand(4).getOffset());
657 assert(0 && "Unknown operand!");