lib/Target/X86/X86IntelAsmPrinter.cpp - fp2-dev/platform/external/llvm - Gitiles

 //===-- X86IntelAsmPrinter.cpp - Convert X86 LLVM code to Intel assembly --===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file was developed by the LLVM research group and is distributed under
 // the University of Illinois Open Source License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file contains a printer that converts from our internal representation
 // of machine-dependent LLVM code to Intel format assembly language.
 // This printer is the output mechanism used by `llc'.
 //
 //===----------------------------------------------------------------------===//

 #include "X86IntelAsmPrinter.h"
 #include "X86TargetAsmInfo.h"
 #include "X86.h"
 #include "llvm/CallingConv.h"
 #include "llvm/Constants.h"
 #include "llvm/Module.h"
 #include "llvm/Assembly/Writer.h"
 #include "llvm/Support/Mangler.h"
 #include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetOptions.h"
 using namespace llvm;

 std::string X86IntelAsmPrinter::getSectionForFunction(const Function &F) const {
   // Intel asm always emits functions to _text.
   return "_text";
 }

 /// runOnMachineFunction - This uses the printMachineInstruction()
 /// method to print assembly for each instruction.
 ///
 bool X86IntelAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   SetupMachineFunction(MF);
   O << "\n\n";

   // Print out constants referenced by the function
   EmitConstantPool(MF.getConstantPool());

   // Print out labels for the function.
   const Function *F = MF.getFunction();
   unsigned CC = F->getCallingConv();

   // Populate function information map.  Actually, We don't want to populate
   // non-stdcall or non-fastcall functions' information right now.
   if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
     FunctionInfoMap[F] = *MF.getInfo<X86FunctionInfo>();

   X86SharedAsmPrinter::decorateName(CurrentFnName, F);

   SwitchToTextSection(getSectionForFunction(*F).c_str(), F);

   switch (F->getLinkage()) {
   default: assert(0 && "Unsupported linkage type!");
   case Function::InternalLinkage:
     EmitAlignment(4);
     break;
   case Function::DLLExportLinkage:
     DLLExportedFns.insert(CurrentFnName);
     //FALLS THROUGH
   case Function::ExternalLinkage:
     O << "\tpublic " << CurrentFnName << "\n";
     EmitAlignment(4);
     break;
   }

   O << CurrentFnName << "\tproc near\n";

   // Print out code for the function.
   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
        I != E; ++I) {
     // Print a label for the basic block if there are any predecessors.
     if (I->pred_begin() != I->pred_end()) {
       printBasicBlockLabel(I, true);
       O << '\n';
     }
     for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
          II != E; ++II) {
       // Print the assembly for the instruction.
       O << "\t";
       printMachineInstruction(II);
     }
   }

   // Print out jump tables referenced by the function.
   EmitJumpTableInfo(MF.getJumpTableInfo(), MF);

   O << CurrentFnName << "\tendp\n";

   // We didn't modify anything.
   return false;
 }

 void X86IntelAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
   unsigned char value = MI->getOperand(Op).getImmedValue();
   assert(value <= 7 && "Invalid ssecc argument!");
   switch (value) {
   case 0: O << "eq"; break;
   case 1: O << "lt"; break;
   case 2: O << "le"; break;
   case 3: O << "unord"; break;
   case 4: O << "neq"; break;
   case 5: O << "nlt"; break;
   case 6: O << "nle"; break;
   case 7: O << "ord"; break;
   }
 }

 void X86IntelAsmPrinter::printOp(const MachineOperand &MO,
                                  const char *Modifier) {
   const MRegisterInfo &RI = *TM.getRegisterInfo();
   switch (MO.getType()) {
   case MachineOperand::MO_Register:
     if (MRegisterInfo::isPhysicalRegister(MO.getReg())) {
       unsigned Reg = MO.getReg();
       if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
         MVT::ValueType VT = (strcmp(Modifier,"subreg64") == 0) ?
           MVT::i64 : ((strcmp(Modifier, "subreg32") == 0) ? MVT::i32 :
                       ((strcmp(Modifier,"subreg16") == 0) ? MVT::i16 :MVT::i8));
         Reg = getX86SubSuperRegister(Reg, VT);
       }
       O << RI.get(Reg).Name;
     } else
       O << "reg" << MO.getReg();
     return;

   case MachineOperand::MO_Immediate:
     O << MO.getImmedValue();
     return;
   case MachineOperand::MO_MachineBasicBlock:
     printBasicBlockLabel(MO.getMachineBasicBlock());
     return;
   case MachineOperand::MO_ConstantPoolIndex: {
     bool isMemOp  = Modifier && !strcmp(Modifier, "mem");
     if (!isMemOp) O << "OFFSET ";
     O << "[" << TAI->getPrivateGlobalPrefix() << "CPI"
       << getFunctionNumber() << "_" << MO.getConstantPoolIndex();
     int Offset = MO.getOffset();
     if (Offset > 0)
       O << " + " << Offset;
     else if (Offset < 0)
       O << Offset;
     O << "]";
     return;
   }
   case MachineOperand::MO_GlobalAddress: {
     bool isCallOp = Modifier && !strcmp(Modifier, "call");
     bool isMemOp  = Modifier && !strcmp(Modifier, "mem");
     GlobalValue *GV = MO.getGlobal();
     std::string Name = Mang->getValueName(GV);

     X86SharedAsmPrinter::decorateName(Name, GV);

     if (!isMemOp && !isCallOp) O << "OFFSET ";
     if (GV->hasDLLImportLinkage()) {
       // FIXME: This should be fixed with full support of stdcall & fastcall
       // CC's
       O << "__imp_";
     }
     O << Name;
     int Offset = MO.getOffset();
     if (Offset > 0)
       O << " + " << Offset;
     else if (Offset < 0)
       O << Offset;
     return;
   }
   case MachineOperand::MO_ExternalSymbol: {
     bool isCallOp = Modifier && !strcmp(Modifier, "call");
     if (!isCallOp) O << "OFFSET ";
     O << TAI->getGlobalPrefix() << MO.getSymbolName();
     return;
   }
   default:
     O << "<unknown operand type>"; return;
   }
 }

 void X86IntelAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
                                            const char *Modifier) {
   assert(isMem(MI, Op) && "Invalid memory reference!");

   const MachineOperand &BaseReg  = MI->getOperand(Op);
   int ScaleVal                   = MI->getOperand(Op+1).getImmedValue();
   const MachineOperand &IndexReg = MI->getOperand(Op+2);
   const MachineOperand &DispSpec = MI->getOperand(Op+3);

   if (BaseReg.isFrameIndex()) {
     O << "[frame slot #" << BaseReg.getFrameIndex();
     if (DispSpec.getImmedValue())
       O << " + " << DispSpec.getImmedValue();
     O << "]";
     return;
   }

   O << "[";
   bool NeedPlus = false;
   if (BaseReg.getReg()) {
     printOp(BaseReg, Modifier);
     NeedPlus = true;
   }

   if (IndexReg.getReg()) {
     if (NeedPlus) O << " + ";
     if (ScaleVal != 1)
       O << ScaleVal << "*";
     printOp(IndexReg, Modifier);
     NeedPlus = true;
   }

   if (DispSpec.isGlobalAddress() || DispSpec.isConstantPoolIndex()) {
     if (NeedPlus)
       O << " + ";
     printOp(DispSpec, "mem");
   } else {
     int DispVal = DispSpec.getImmedValue();
     if (DispVal || (!BaseReg.getReg() && !IndexReg.getReg())) {
       if (NeedPlus)
         if (DispVal > 0)
           O << " + ";
         else {
           O << " - ";
           DispVal = -DispVal;
         }
       O << DispVal;
     }
   }
   O << "]";
 }

 void X86IntelAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
   O << "\"L" << getFunctionNumber() << "$pb\"\n";
   O << "\"L" << getFunctionNumber() << "$pb\":";
 }

 bool X86IntelAsmPrinter::printAsmMRegister(const MachineOperand &MO,
                                            const char Mode) {
   const MRegisterInfo &RI = *TM.getRegisterInfo();
   unsigned Reg = MO.getReg();
   switch (Mode) {
   default: return true;  // Unknown mode.
   case 'b': // Print QImode register
     Reg = getX86SubSuperRegister(Reg, MVT::i8);
     break;
   case 'h': // Print QImode high register
     Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
     break;
   case 'w': // Print HImode register
     Reg = getX86SubSuperRegister(Reg, MVT::i16);
     break;
   case 'k': // Print SImode register
     Reg = getX86SubSuperRegister(Reg, MVT::i32);
     break;
   }

   O << '%' << RI.get(Reg).Name;
   return false;
 }

 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 ///
 bool X86IntelAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
                                          unsigned AsmVariant,
                                          const char *ExtraCode) {
   // Does this asm operand have a single letter operand modifier?
   if (ExtraCode && ExtraCode[0]) {
     if (ExtraCode[1] != 0) return true; // Unknown modifier.

     switch (ExtraCode[0]) {
     default: return true;  // Unknown modifier.
     case 'b': // Print QImode register
     case 'h': // Print QImode high register
     case 'w': // Print HImode register
     case 'k': // Print SImode register
       return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
     }
   }

   printOperand(MI, OpNo);
   return false;
 }

 bool X86IntelAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
                                                unsigned OpNo,
                                                unsigned AsmVariant,
                                                const char *ExtraCode) {
   if (ExtraCode && ExtraCode[0])
     return true; // Unknown modifier.
   printMemReference(MI, OpNo);
   return false;
 }

 /// printMachineInstruction -- Print out a single X86 LLVM instruction
 /// MI in Intel syntax to the current output stream.
 ///
 void X86IntelAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
   ++EmittedInsts;

   // See if a truncate instruction can be turned into a nop.
   switch (MI->getOpcode()) {
   default: break;
   case X86::TRUNC_64to32:
   case X86::TRUNC_64to16:
   case X86::TRUNC_32to16:
   case X86::TRUNC_32to8:
   case X86::TRUNC_16to8:
   case X86::TRUNC_32_to8:
   case X86::TRUNC_16_to8: {
     const MachineOperand &MO0 = MI->getOperand(0);
     const MachineOperand &MO1 = MI->getOperand(1);
     unsigned Reg0 = MO0.getReg();
     unsigned Reg1 = MO1.getReg();
     unsigned Opc = MI->getOpcode();
     if (Opc == X86::TRUNC_64to32)
       Reg1 = getX86SubSuperRegister(Reg1, MVT::i32);
     else if (Opc == X86::TRUNC_32to16 || Opc == X86::TRUNC_64to16)
       Reg1 = getX86SubSuperRegister(Reg1, MVT::i16);
     else
       Reg1 = getX86SubSuperRegister(Reg1, MVT::i8);
     O << TAI->getCommentString() << " TRUNCATE ";
     if (Reg0 != Reg1)
       O << "\n\t";
     break;
   }
   case X86::PsMOVZX64rr32:
     O << TAI->getCommentString() << " ZERO-EXTEND " << "\n\t";
     break;
   }

   // Call the autogenerated instruction printer routines.
   printInstruction(MI);
 }

 bool X86IntelAsmPrinter::doInitialization(Module &M) {
   X86SharedAsmPrinter::doInitialization(M);

   Mang->markCharUnacceptable('.');

   O << "\t.686\n\t.model flat\n\n";

   // Emit declarations for external functions.
   for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
     if (I->isExternal()) {
       std::string Name = Mang->getValueName(I);
       X86SharedAsmPrinter::decorateName(Name, I);

       O << "\textern " ;
       if (I->hasDLLImportLinkage()) {
         O << "__imp_";
       }
       O << Name << ":near\n";
     }

   // Emit declarations for external globals.  Note that VC++ always declares
   // external globals to have type byte, and if that's good enough for VC++...
   for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
        I != E; ++I) {
     if (I->isExternal()) {
       std::string Name = Mang->getValueName(I);

       O << "\textern " ;
       if (I->hasDLLImportLinkage()) {
         O << "__imp_";
       }
       O << Name << ":byte\n";
     }
   }

   return false;
 }

 bool X86IntelAsmPrinter::doFinalization(Module &M) {
   const TargetData *TD = TM.getTargetData();

   // Print out module-level global variables here.
   for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
        I != E; ++I) {
     if (I->isExternal()) continue;   // External global require no code

     // Check to see if this is a special global used by LLVM, if so, emit it.
     if (EmitSpecialLLVMGlobal(I))
       continue;

     std::string name = Mang->getValueName(I);
     Constant *C = I->getInitializer();
     unsigned Size = TD->getTypeSize(C->getType());
     unsigned Align = getPreferredAlignmentLog(I);
     bool bCustomSegment = false;

     switch (I->getLinkage()) {
     case GlobalValue::LinkOnceLinkage:
     case GlobalValue::WeakLinkage:
       SwitchToDataSection("", 0);
       O << name << "?\tsegment common 'COMMON'\n";
       bCustomSegment = true;
       // FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
       // are also available.
       break;
     case GlobalValue::AppendingLinkage:
       SwitchToDataSection("", 0);
       O << name << "?\tsegment public 'DATA'\n";
       bCustomSegment = true;
       // FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
       // are also available.
       break;
     case GlobalValue::DLLExportLinkage:
       DLLExportedGVs.insert(name);
       // FALL THROUGH
     case GlobalValue::ExternalLinkage:
       O << "\tpublic " << name << "\n";
       // FALL THROUGH
     case GlobalValue::InternalLinkage:
       SwitchToDataSection(TAI->getDataSection(), I);
       break;
     default:
       assert(0 && "Unknown linkage type!");
     }

     if (!bCustomSegment)
       EmitAlignment(Align, I);

     O << name << ":\t\t\t\t" << TAI->getCommentString()
       << " " << I->getName() << '\n';

     EmitGlobalConstant(C);

     if (bCustomSegment)
       O << name << "?\tends\n";
   }

     // Output linker support code for dllexported globals
   if ((DLLExportedGVs.begin() != DLLExportedGVs.end()) ||
       (DLLExportedFns.begin() != DLLExportedFns.end())) {
     SwitchToDataSection("", 0);
     O << "; WARNING: The following code is valid only with MASM v8.x and (possible) higher\n"
       << "; This version of MASM is usually shipped with Microsoft Visual Studio 2005\n"
       << "; or (possible) further versions. Unfortunately, there is no way to support\n"
       << "; dllexported symbols in the earlier versions of MASM in fully automatic way\n\n";
     O << "_drectve\t segment info alias('.drectve')\n";
   }

   for (std::set<std::string>::iterator i = DLLExportedGVs.begin(),
          e = DLLExportedGVs.end();
          i != e; ++i) {
     O << "\t db ' /EXPORT:" << *i << ",data'\n";
   }

   for (std::set<std::string>::iterator i = DLLExportedFns.begin(),
          e = DLLExportedFns.end();
          i != e; ++i) {
     O << "\t db ' /EXPORT:" << *i << "'\n";
   }

   if ((DLLExportedGVs.begin() != DLLExportedGVs.end()) ||
       (DLLExportedFns.begin() != DLLExportedFns.end())) {
     O << "_drectve\t ends\n";
   }

   // Bypass X86SharedAsmPrinter::doFinalization().
   AsmPrinter::doFinalization(M);
   SwitchToDataSection("", 0);
   O << "\tend\n";
   return false; // success
 }

 void X86IntelAsmPrinter::EmitString(const ConstantArray *CVA) const {
   unsigned NumElts = CVA->getNumOperands();
   if (NumElts) {
     // ML does not have escape sequences except '' for '.  It also has a maximum
     // string length of 255.
     unsigned len = 0;
     bool inString = false;
     for (unsigned i = 0; i < NumElts; i++) {
       int n = cast<ConstantInt>(CVA->getOperand(i))->getZExtValue() & 255;
       if (len == 0)
         O << "\tdb ";

       if (n >= 32 && n <= 127) {
         if (!inString) {
           if (len > 0) {
             O << ",'";
             len += 2;
           } else {
             O << "'";
             len++;
           }
           inString = true;
         }
         if (n == '\'') {
           O << "'";
           len++;
         }
         O << char(n);
       } else {
         if (inString) {
           O << "'";
           len++;
           inString = false;
         }
         if (len > 0) {
           O << ",";
           len++;
         }
         O << n;
         len += 1 + (n > 9) + (n > 99);
       }

       if (len > 60) {
         if (inString) {
           O << "'";
           inString = false;
         }
         O << "\n";
         len = 0;
       }
     }

     if (len > 0) {
       if (inString)
         O << "'";
       O << "\n";
     }
   }
 }

 // Include the auto-generated portion of the assembly writer.
 #include "X86GenAsmWriter1.inc"
	//===-- X86IntelAsmPrinter.cpp - Convert X86 LLVM code to Intel assembly --===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file was developed by the LLVM research group and is distributed under
	// the University of Illinois Open Source License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// This file contains a printer that converts from our internal representation
	// of machine-dependent LLVM code to Intel format assembly language.
	// This printer is the output mechanism used by `llc'.
	//
	//===----------------------------------------------------------------------===//

	#include "X86IntelAsmPrinter.h"
	#include "X86TargetAsmInfo.h"
	#include "X86.h"
	#include "llvm/CallingConv.h"
	#include "llvm/Constants.h"
	#include "llvm/Module.h"
	#include "llvm/Assembly/Writer.h"
	#include "llvm/Support/Mangler.h"
	#include "llvm/Target/TargetAsmInfo.h"
	#include "llvm/Target/TargetOptions.h"
	using namespace llvm;

	std::string X86IntelAsmPrinter::getSectionForFunction(const Function &F) const {
	// Intel asm always emits functions to _text.
	return "_text";
	}

	/// runOnMachineFunction - This uses the printMachineInstruction()
	/// method to print assembly for each instruction.
	///
	bool X86IntelAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
	SetupMachineFunction(MF);
	O << "\n\n";

	// Print out constants referenced by the function
	EmitConstantPool(MF.getConstantPool());

	// Print out labels for the function.
	const Function *F = MF.getFunction();
	unsigned CC = F->getCallingConv();

	// Populate function information map. Actually, We don't want to populate
	// non-stdcall or non-fastcall functions' information right now.
	if (CC == CallingConv::X86_StdCall \|\| CC == CallingConv::X86_FastCall)
	FunctionInfoMap[F] = *MF.getInfo<X86FunctionInfo>();

	X86SharedAsmPrinter::decorateName(CurrentFnName, F);

	SwitchToTextSection(getSectionForFunction(*F).c_str(), F);

	switch (F->getLinkage()) {
	default: assert(0 && "Unsupported linkage type!");
	case Function::InternalLinkage:
	EmitAlignment(4);
	break;
	case Function::DLLExportLinkage:
	DLLExportedFns.insert(CurrentFnName);
	//FALLS THROUGH
	case Function::ExternalLinkage:
	O << "\tpublic " << CurrentFnName << "\n";
	EmitAlignment(4);
	break;
	}

	O << CurrentFnName << "\tproc near\n";

	// Print out code for the function.
	for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
	I != E; ++I) {
	// Print a label for the basic block if there are any predecessors.
	if (I->pred_begin() != I->pred_end()) {
	printBasicBlockLabel(I, true);
	O << '\n';
	}
	for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
	II != E; ++II) {
	// Print the assembly for the instruction.
	O << "\t";
	printMachineInstruction(II);
	}
	}

	// Print out jump tables referenced by the function.
	EmitJumpTableInfo(MF.getJumpTableInfo(), MF);

	O << CurrentFnName << "\tendp\n";

	// We didn't modify anything.
	return false;
	}

	void X86IntelAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
	unsigned char value = MI->getOperand(Op).getImmedValue();
	assert(value <= 7 && "Invalid ssecc argument!");
	switch (value) {
	case 0: O << "eq"; break;
	case 1: O << "lt"; break;
	case 2: O << "le"; break;
	case 3: O << "unord"; break;
	case 4: O << "neq"; break;
	case 5: O << "nlt"; break;
	case 6: O << "nle"; break;
	case 7: O << "ord"; break;
	}
	}

	void X86IntelAsmPrinter::printOp(const MachineOperand &MO,
	const char *Modifier) {
	const MRegisterInfo &RI = *TM.getRegisterInfo();
	switch (MO.getType()) {
	case MachineOperand::MO_Register:
	if (MRegisterInfo::isPhysicalRegister(MO.getReg())) {
	unsigned Reg = MO.getReg();
	if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
	MVT::ValueType VT = (strcmp(Modifier,"subreg64") == 0) ?
	MVT::i64 : ((strcmp(Modifier, "subreg32") == 0) ? MVT::i32 :
	((strcmp(Modifier,"subreg16") == 0) ? MVT::i16 :MVT::i8));
	Reg = getX86SubSuperRegister(Reg, VT);
	}
	O << RI.get(Reg).Name;
	} else
	O << "reg" << MO.getReg();
	return;

	case MachineOperand::MO_Immediate:
	O << MO.getImmedValue();
	return;
	case MachineOperand::MO_MachineBasicBlock:
	printBasicBlockLabel(MO.getMachineBasicBlock());
	return;
	case MachineOperand::MO_ConstantPoolIndex: {
	bool isMemOp = Modifier && !strcmp(Modifier, "mem");
	if (!isMemOp) O << "OFFSET ";
	O << "[" << TAI->getPrivateGlobalPrefix() << "CPI"
	<< getFunctionNumber() << "_" << MO.getConstantPoolIndex();
	int Offset = MO.getOffset();
	if (Offset > 0)
	O << " + " << Offset;
	else if (Offset < 0)
	O << Offset;
	O << "]";
	return;
	}
	case MachineOperand::MO_GlobalAddress: {
	bool isCallOp = Modifier && !strcmp(Modifier, "call");
	bool isMemOp = Modifier && !strcmp(Modifier, "mem");
	GlobalValue *GV = MO.getGlobal();
	std::string Name = Mang->getValueName(GV);

	X86SharedAsmPrinter::decorateName(Name, GV);

	if (!isMemOp && !isCallOp) O << "OFFSET ";
	if (GV->hasDLLImportLinkage()) {
	// FIXME: This should be fixed with full support of stdcall & fastcall
	// CC's
	O << "__imp_";
	}
	O << Name;
	int Offset = MO.getOffset();
	if (Offset > 0)
	O << " + " << Offset;
	else if (Offset < 0)
	O << Offset;
	return;
	}
	case MachineOperand::MO_ExternalSymbol: {
	bool isCallOp = Modifier && !strcmp(Modifier, "call");
	if (!isCallOp) O << "OFFSET ";
	O << TAI->getGlobalPrefix() << MO.getSymbolName();
	return;
	}
	default:
	O << "<unknown operand type>"; return;
	}
	}

	void X86IntelAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
	const char *Modifier) {
	assert(isMem(MI, Op) && "Invalid memory reference!");

	const MachineOperand &BaseReg = MI->getOperand(Op);
	int ScaleVal = MI->getOperand(Op+1).getImmedValue();
	const MachineOperand &IndexReg = MI->getOperand(Op+2);
	const MachineOperand &DispSpec = MI->getOperand(Op+3);

	if (BaseReg.isFrameIndex()) {
	O << "[frame slot #" << BaseReg.getFrameIndex();
	if (DispSpec.getImmedValue())
	O << " + " << DispSpec.getImmedValue();
	O << "]";
	return;
	}

	O << "[";
	bool NeedPlus = false;
	if (BaseReg.getReg()) {
	printOp(BaseReg, Modifier);
	NeedPlus = true;
	}

	if (IndexReg.getReg()) {
	if (NeedPlus) O << " + ";
	if (ScaleVal != 1)
	O << ScaleVal << "*";
	printOp(IndexReg, Modifier);
	NeedPlus = true;
	}

	if (DispSpec.isGlobalAddress() \|\| DispSpec.isConstantPoolIndex()) {
	if (NeedPlus)
	O << " + ";
	printOp(DispSpec, "mem");
	} else {
	int DispVal = DispSpec.getImmedValue();
	if (DispVal \|\| (!BaseReg.getReg() && !IndexReg.getReg())) {
	if (NeedPlus)
	if (DispVal > 0)
	O << " + ";
	else {
	O << " - ";
	DispVal = -DispVal;
	}
	O << DispVal;
	}
	}
	O << "]";
	}

	void X86IntelAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
	O << "\"L" << getFunctionNumber() << "$pb\"\n";
	O << "\"L" << getFunctionNumber() << "$pb\":";
	}

	bool X86IntelAsmPrinter::printAsmMRegister(const MachineOperand &MO,
	const char Mode) {
	const MRegisterInfo &RI = *TM.getRegisterInfo();
	unsigned Reg = MO.getReg();
	switch (Mode) {
	default: return true; // Unknown mode.
	case 'b': // Print QImode register
	Reg = getX86SubSuperRegister(Reg, MVT::i8);
	break;
	case 'h': // Print QImode high register
	Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
	break;
	case 'w': // Print HImode register
	Reg = getX86SubSuperRegister(Reg, MVT::i16);
	break;
	case 'k': // Print SImode register
	Reg = getX86SubSuperRegister(Reg, MVT::i32);
	break;
	}

	O << '%' << RI.get(Reg).Name;
	return false;
	}

	/// PrintAsmOperand - Print out an operand for an inline asm expression.
	///
	bool X86IntelAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
	unsigned AsmVariant,
	const char *ExtraCode) {
	// Does this asm operand have a single letter operand modifier?
	if (ExtraCode && ExtraCode[0]) {
	if (ExtraCode[1] != 0) return true; // Unknown modifier.

	switch (ExtraCode[0]) {
	default: return true; // Unknown modifier.
	case 'b': // Print QImode register
	case 'h': // Print QImode high register
	case 'w': // Print HImode register
	case 'k': // Print SImode register
	return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
	}
	}

	printOperand(MI, OpNo);
	return false;
	}

	bool X86IntelAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
	unsigned OpNo,
	unsigned AsmVariant,
	const char *ExtraCode) {
	if (ExtraCode && ExtraCode[0])
	return true; // Unknown modifier.
	printMemReference(MI, OpNo);
	return false;
	}

	/// printMachineInstruction -- Print out a single X86 LLVM instruction
	/// MI in Intel syntax to the current output stream.
	///
	void X86IntelAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
	++EmittedInsts;

	// See if a truncate instruction can be turned into a nop.
	switch (MI->getOpcode()) {
	default: break;
	case X86::TRUNC_64to32:
	case X86::TRUNC_64to16:
	case X86::TRUNC_32to16:
	case X86::TRUNC_32to8:
	case X86::TRUNC_16to8:
	case X86::TRUNC_32_to8:
	case X86::TRUNC_16_to8: {
	const MachineOperand &MO0 = MI->getOperand(0);
	const MachineOperand &MO1 = MI->getOperand(1);
	unsigned Reg0 = MO0.getReg();
	unsigned Reg1 = MO1.getReg();
	unsigned Opc = MI->getOpcode();
	if (Opc == X86::TRUNC_64to32)
	Reg1 = getX86SubSuperRegister(Reg1, MVT::i32);
	else if (Opc == X86::TRUNC_32to16 \|\| Opc == X86::TRUNC_64to16)
	Reg1 = getX86SubSuperRegister(Reg1, MVT::i16);
	else
	Reg1 = getX86SubSuperRegister(Reg1, MVT::i8);
	O << TAI->getCommentString() << " TRUNCATE ";
	if (Reg0 != Reg1)
	O << "\n\t";
	break;
	}
	case X86::PsMOVZX64rr32:
	O << TAI->getCommentString() << " ZERO-EXTEND " << "\n\t";
	break;
	}

	// Call the autogenerated instruction printer routines.
	printInstruction(MI);
	}

	bool X86IntelAsmPrinter::doInitialization(Module &M) {
	X86SharedAsmPrinter::doInitialization(M);

	Mang->markCharUnacceptable('.');

	O << "\t.686\n\t.model flat\n\n";

	// Emit declarations for external functions.
	for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
	if (I->isExternal()) {
	std::string Name = Mang->getValueName(I);
	X86SharedAsmPrinter::decorateName(Name, I);

	O << "\textern " ;
	if (I->hasDLLImportLinkage()) {
	O << "__imp_";
	}
	O << Name << ":near\n";
	}

	// Emit declarations for external globals. Note that VC++ always declares
	// external globals to have type byte, and if that's good enough for VC++...
	for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
	I != E; ++I) {
	if (I->isExternal()) {
	std::string Name = Mang->getValueName(I);

	O << "\textern " ;
	if (I->hasDLLImportLinkage()) {
	O << "__imp_";
	}
	O << Name << ":byte\n";
	}
	}

	return false;
	}

	bool X86IntelAsmPrinter::doFinalization(Module &M) {
	const TargetData *TD = TM.getTargetData();

	// Print out module-level global variables here.
	for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
	I != E; ++I) {
	if (I->isExternal()) continue; // External global require no code

	// Check to see if this is a special global used by LLVM, if so, emit it.
	if (EmitSpecialLLVMGlobal(I))
	continue;

	std::string name = Mang->getValueName(I);
	Constant *C = I->getInitializer();
	unsigned Size = TD->getTypeSize(C->getType());
	unsigned Align = getPreferredAlignmentLog(I);
	bool bCustomSegment = false;

	switch (I->getLinkage()) {
	case GlobalValue::LinkOnceLinkage:
	case GlobalValue::WeakLinkage:
	SwitchToDataSection("", 0);
	O << name << "?\tsegment common 'COMMON'\n";
	bCustomSegment = true;
	// FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
	// are also available.
	break;
	case GlobalValue::AppendingLinkage:
	SwitchToDataSection("", 0);
	O << name << "?\tsegment public 'DATA'\n";
	bCustomSegment = true;
	// FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
	// are also available.
	break;
	case GlobalValue::DLLExportLinkage:
	DLLExportedGVs.insert(name);
	// FALL THROUGH
	case GlobalValue::ExternalLinkage:
	O << "\tpublic " << name << "\n";
	// FALL THROUGH
	case GlobalValue::InternalLinkage:
	SwitchToDataSection(TAI->getDataSection(), I);
	break;
	default:
	assert(0 && "Unknown linkage type!");
	}

	if (!bCustomSegment)
	EmitAlignment(Align, I);

	O << name << ":\t\t\t\t" << TAI->getCommentString()
	<< " " << I->getName() << '\n';

	EmitGlobalConstant(C);

	if (bCustomSegment)
	O << name << "?\tends\n";
	}

	// Output linker support code for dllexported globals
	if ((DLLExportedGVs.begin() != DLLExportedGVs.end()) \|\|
	(DLLExportedFns.begin() != DLLExportedFns.end())) {
	SwitchToDataSection("", 0);
	O << "; WARNING: The following code is valid only with MASM v8.x and (possible) higher\n"
	<< "; This version of MASM is usually shipped with Microsoft Visual Studio 2005\n"
	<< "; or (possible) further versions. Unfortunately, there is no way to support\n"
	<< "; dllexported symbols in the earlier versions of MASM in fully automatic way\n\n";
	O << "_drectve\t segment info alias('.drectve')\n";
	}

	for (std::set<std::string>::iterator i = DLLExportedGVs.begin(),
	e = DLLExportedGVs.end();
	i != e; ++i) {
	O << "\t db ' /EXPORT:" << *i << ",data'\n";
	}

	for (std::set<std::string>::iterator i = DLLExportedFns.begin(),
	e = DLLExportedFns.end();
	i != e; ++i) {
	O << "\t db ' /EXPORT:" << *i << "'\n";
	}

	if ((DLLExportedGVs.begin() != DLLExportedGVs.end()) \|\|
	(DLLExportedFns.begin() != DLLExportedFns.end())) {
	O << "_drectve\t ends\n";
	}

	// Bypass X86SharedAsmPrinter::doFinalization().
	AsmPrinter::doFinalization(M);
	SwitchToDataSection("", 0);
	O << "\tend\n";
	return false; // success
	}

	void X86IntelAsmPrinter::EmitString(const ConstantArray *CVA) const {
	unsigned NumElts = CVA->getNumOperands();
	if (NumElts) {
	// ML does not have escape sequences except '' for '. It also has a maximum
	// string length of 255.
	unsigned len = 0;
	bool inString = false;
	for (unsigned i = 0; i < NumElts; i++) {
	int n = cast<ConstantInt>(CVA->getOperand(i))->getZExtValue() & 255;
	if (len == 0)
	O << "\tdb ";

	if (n >= 32 && n <= 127) {
	if (!inString) {
	if (len > 0) {
	O << ",'";
	len += 2;
	} else {
	O << "'";
	len++;
	}
	inString = true;
	}
	if (n == '\'') {
	O << "'";
	len++;
	}
	O << char(n);
	} else {
	if (inString) {
	O << "'";
	len++;
	inString = false;
	}
	if (len > 0) {
	O << ",";
	len++;
	}
	O << n;
	len += 1 + (n > 9) + (n > 99);
	}

	if (len > 60) {
	if (inString) {
	O << "'";
	inString = false;
	}
	O << "\n";
	len = 0;
	}
	}

	if (len > 0) {
	if (inString)
	O << "'";
	O << "\n";
	}
	}
	}

	// Include the auto-generated portion of the assembly writer.
	#include "X86GenAsmWriter1.inc"