lib/Target/IA64/IA64AsmPrinter.cpp - fp2-dev/platform/external/llvm - Gitiles

 //===-- IA64AsmPrinter.cpp - Print out IA64 LLVM as assembly --------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file was developed by Duraid Madina 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 assembly accepted by the GNU binutils 'gas'
 // assembler. The Intel 'ias' and HP-UX 'as' assemblers *may* choke on this
 // output, but if so that's a bug I'd like to hear about: please file a bug
 // report in bugzilla. FYI, the excellent 'ias' assembler is bundled with
 // the Intel C/C++ compiler for Itanium Linux.
 //
 //===----------------------------------------------------------------------===//

 #include "IA64.h"
 #include "IA64TargetMachine.h"
 #include "llvm/Module.h"
 #include "llvm/Type.h"
 #include "llvm/Assembly/Writer.h"
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/CodeGen/MachineConstantPool.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/ValueTypes.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Support/Mangler.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/Support/CommandLine.h"
 using namespace llvm;

 namespace {
   Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");

   struct IA64SharedAsmPrinter : public AsmPrinter {

     std::set<std::string> ExternalFunctionNames, ExternalObjectNames;

     IA64SharedAsmPrinter(std::ostream &O, TargetMachine &TM)
       : AsmPrinter(O, TM) { }

     void printConstantPool(MachineConstantPool *MCP);
     bool doFinalization(Module &M);
   };
 }

 static bool isScale(const MachineOperand &MO) {
   return MO.isImmediate() &&
     (MO.getImmedValue() == 1 || MO.getImmedValue() == 2 ||
      MO.getImmedValue() == 4 || MO.getImmedValue() == 8);
 }

 static bool isMem(const MachineInstr *MI, unsigned Op) {
   if (MI->getOperand(Op).isFrameIndex()) return true;
   if (MI->getOperand(Op).isConstantPoolIndex()) return true;
   return Op+4 <= MI->getNumOperands() &&
     MI->getOperand(Op  ).isRegister() && isScale(MI->getOperand(Op+1)) &&
     MI->getOperand(Op+2).isRegister() && (MI->getOperand(Op+3).isImmediate() ||
         MI->getOperand(Op+3).isGlobalAddress());
 }

 // SwitchSection - Switch to the specified section of the executable if we are
 // not already in it!
 //
 static void SwitchSection(std::ostream &OS, std::string &CurSection,
                           const char *NewSection) {
   if (CurSection != NewSection) {
     CurSection = NewSection;
     if (!CurSection.empty())
       OS << "\t" << NewSection << "\n";
   }
 }

 /// printConstantPool - Print to the current output stream assembly
 /// representations of the constants in the constant pool MCP. This is
 /// used to print out constants which have been "spilled to memory" by
 /// the code generator.
 ///
 void IA64SharedAsmPrinter::printConstantPool(MachineConstantPool *MCP) {
   const std::vector<Constant*> &CP = MCP->getConstants();
   const TargetData &TD = TM.getTargetData();

   if (CP.empty()) return;

   O << "\n\t.section .data, \"aw\", \"progbits\"\n";
       // FIXME: would be nice to have rodata (no 'w') when appropriate?
   for (unsigned i = 0, e = CP.size(); i != e; ++i) {
     emitAlignment(TD.getTypeAlignmentShift(CP[i]->getType()));
     O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t" << CommentString
       << *CP[i] << "\n";
     emitGlobalConstant(CP[i]);
   }
 }

 bool IA64SharedAsmPrinter::doFinalization(Module &M) {
   const TargetData &TD = TM.getTargetData();
   std::string CurSection;

   // 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->hasInitializer()) {   // External global require no code
       O << "\n\n";
       std::string name = Mang->getValueName(I);
       Constant *C = I->getInitializer();
       unsigned Size = TD.getTypeSize(C->getType());
       unsigned Align = TD.getTypeAlignmentShift(C->getType());

       if (C->isNullValue() &&
           (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
            I->hasWeakLinkage() /* FIXME: Verify correct */)) {
         SwitchSection(O, CurSection, ".data");
         if (I->hasInternalLinkage()) {
 	  O << "\t.lcomm " << name << "," << TD.getTypeSize(C->getType())
 	    << "," << (1 << Align);
 	  O << "\t\t// ";
 	} else {
 	  O << "\t.common " << name << "," << TD.getTypeSize(C->getType())
 	    << "," << (1 << Align);
 	  O << "\t\t// ";
 	}
         WriteAsOperand(O, I, true, true, &M);
         O << "\n";
       } else {
         switch (I->getLinkage()) {
         case GlobalValue::LinkOnceLinkage:
         case GlobalValue::WeakLinkage:   // FIXME: Verify correct for weak.
           // Nonnull linkonce -> weak
           O << "\t.weak " << name << "\n";
           SwitchSection(O, CurSection, "");
           O << "\t.section\t.llvm.linkonce.d." << name
 	    << ", \"aw\", \"progbits\"\n";
           break;
         case GlobalValue::AppendingLinkage:
           // FIXME: appending linkage variables should go into a section of
           // their name or something.  For now, just emit them as external.
         case GlobalValue::ExternalLinkage:
           // If external or appending, declare as a global symbol
           O << "\t.global " << name << "\n";
           // FALL THROUGH
         case GlobalValue::InternalLinkage:
           if (C->isNullValue())
             SwitchSection(O, CurSection, ".bss");
           else
             SwitchSection(O, CurSection, ".data");
           break;
         case GlobalValue::GhostLinkage:
           std::cerr << "GhostLinkage cannot appear in IA64AsmPrinter!\n";
           abort();
         }

         emitAlignment(Align);
         O << "\t.type " << name << ",@object\n";
         O << "\t.size " << name << "," << Size << "\n";
         O << name << ":\t\t\t\t// ";
         WriteAsOperand(O, I, true, true, &M);
         O << " = ";
         WriteAsOperand(O, C, false, false, &M);
         O << "\n";
         emitGlobalConstant(C);
       }
     }

   // we print out ".global X \n .type X, @function" for each external function
   O << "\n\n// br.call targets referenced (and not defined) above: \n";
   for (std::set<std::string>::iterator i = ExternalFunctionNames.begin(),
        e = ExternalFunctionNames.end(); i!=e; ++i) {
     O << "\t.global " << *i << "\n\t.type " << *i << ", @function\n";
   }
   O << "\n\n";

   // we print out ".global X \n .type X, @object" for each external object
   O << "\n\n// (external) symbols referenced (and not defined) above: \n";
   for (std::set<std::string>::iterator i = ExternalObjectNames.begin(),
        e = ExternalObjectNames.end(); i!=e; ++i) {
     O << "\t.global " << *i << "\n\t.type " << *i << ", @object\n";
   }
   O << "\n\n";

   AsmPrinter::doFinalization(M);
   return false; // success
 }

 namespace {
   struct IA64AsmPrinter : public IA64SharedAsmPrinter {
     IA64AsmPrinter(std::ostream &O, TargetMachine &TM)
       : IA64SharedAsmPrinter(O, TM) {

       CommentString = "//";
       Data8bitsDirective = "\tdata1\t";     // FIXME: check that we are
       Data16bitsDirective = "\tdata2.ua\t"; // disabling auto-alignment
       Data32bitsDirective = "\tdata4.ua\t"; // properly
       Data64bitsDirective = "\tdata8.ua\t";
       ZeroDirective = "\t.skip\t";
       AsciiDirective = "\tstring\t";

       GlobalVarAddrPrefix="";
       GlobalVarAddrSuffix="";
       FunctionAddrPrefix="@fptr(";
       FunctionAddrSuffix=")";

     }

     virtual const char *getPassName() const {
       return "IA64 Assembly Printer";
     }

     /// printInstruction - This method is automatically generated by tablegen
     /// from the instruction set description.  This method returns true if the
     /// machine instruction was sufficiently described to print it, otherwise it
     /// returns false.
     bool printInstruction(const MachineInstr *MI);

     // This method is used by the tablegen'erated instruction printer.
     void printOperand(const MachineInstr *MI, unsigned OpNo, MVT::ValueType VT){
       const MachineOperand &MO = MI->getOperand(OpNo);
       if (MO.getType() == MachineOperand::MO_MachineRegister) {
         assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physref??");
         //XXX Bug Workaround: See note in Printer::doInitialization about %.
         O << TM.getRegisterInfo()->get(MO.getReg()).Name;
       } else {
         printOp(MO);
       }
     }

     void printS8ImmOperand(const MachineInstr *MI, unsigned OpNo,
                             MVT::ValueType VT) {
       int val=(unsigned int)MI->getOperand(OpNo).getImmedValue();
       if(val>=128) val=val-256; // if negative, flip sign
       O << val;
     }
     void printS14ImmOperand(const MachineInstr *MI, unsigned OpNo,
                             MVT::ValueType VT) {
       int val=(unsigned int)MI->getOperand(OpNo).getImmedValue();
       if(val>=8192) val=val-16384; // if negative, flip sign
       O << val;
     }
     void printS22ImmOperand(const MachineInstr *MI, unsigned OpNo,
                             MVT::ValueType VT) {
       int val=(unsigned int)MI->getOperand(OpNo).getImmedValue();
       if(val>=2097152) val=val-4194304; // if negative, flip sign
       O << val;
     }
     void printU64ImmOperand(const MachineInstr *MI, unsigned OpNo,
                             MVT::ValueType VT) {
       O << (uint64_t)MI->getOperand(OpNo).getImmedValue();
     }
     void printS64ImmOperand(const MachineInstr *MI, unsigned OpNo,
                             MVT::ValueType VT) {
       O << (int64_t)MI->getOperand(OpNo).getImmedValue();
     }

     void printCallOperand(const MachineInstr *MI, unsigned OpNo,
                           MVT::ValueType VT) {
       printOp(MI->getOperand(OpNo), true); // this is a br.call instruction
     }

     void printMachineInstruction(const MachineInstr *MI);
     void printOp(const MachineOperand &MO, bool isBRCALLinsn= false);
     bool runOnMachineFunction(MachineFunction &F);
     bool doInitialization(Module &M);
   };
 } // end of anonymous namespace


 // Include the auto-generated portion of the assembly writer.
 #include "IA64GenAsmWriter.inc"


 /// runOnMachineFunction - This uses the printMachineInstruction()
 /// method to print assembly for each instruction.
 ///
 bool IA64AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   setupMachineFunction(MF);
   O << "\n\n";

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

   // Print out labels for the function.
   O << "\n\t.section .text, \"ax\", \"progbits\"\n";
               // ^^  means "Allocated instruXions in mem, initialized"
   emitAlignment(5);
   O << "\t.global\t" << CurrentFnName << "\n";
   O << "\t.type\t" << CurrentFnName << ", @function\n";
   O << CurrentFnName << ":\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())
       O << ".LBB" << CurrentFnName << "_" << I->getNumber() << ":\t"
         << CommentString << " " << I->getBasicBlock()->getName() << "\n";
     for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
          II != E; ++II) {
       // Print the assembly for the instruction.
       O << "\t";
       printMachineInstruction(II);
     }
   }

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

 void IA64AsmPrinter::printOp(const MachineOperand &MO,
                                  bool isBRCALLinsn /* = false */) {
   const MRegisterInfo &RI = *TM.getRegisterInfo();
   switch (MO.getType()) {
   case MachineOperand::MO_VirtualRegister:
     if (Value *V = MO.getVRegValueOrNull()) {
       O << "<" << V->getName() << ">";
       return;
     }
     // FALLTHROUGH
   case MachineOperand::MO_MachineRegister:
   case MachineOperand::MO_CCRegister: {
     O << RI.get(MO.getReg()).Name;
     return;
   }

   case MachineOperand::MO_SignExtendedImmed:
   case MachineOperand::MO_UnextendedImmed:
     O << /*(unsigned int)*/MO.getImmedValue();
     return;
   case MachineOperand::MO_MachineBasicBlock: {
     MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
     O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction())
       << "_" << MBBOp->getNumber () << "\t// "
       << MBBOp->getBasicBlock ()->getName ();
     return;
   }
   case MachineOperand::MO_PCRelativeDisp:
     std::cerr << "Shouldn't use addPCDisp() when building IA64 MachineInstrs";
     abort ();
     return;

   case MachineOperand::MO_ConstantPoolIndex: {
     O << "@gprel(.CPI" << CurrentFnName << "_"
       << MO.getConstantPoolIndex() << ")";
     return;
   }

   case MachineOperand::MO_GlobalAddress: {

     // functions need @ltoff(@fptr(fn_name)) form
     GlobalValue *GV = MO.getGlobal();
     Function *F = dyn_cast<Function>(GV);

     bool Needfptr=false; // if we're computing an address @ltoff(X), do
                          // we need to decorate it so it becomes
 			 // @ltoff(@fptr(X)) ?
     if(F && !isBRCALLinsn /*&& F->isExternal()*/)
       Needfptr=true;

     // if this is the target of a call instruction, we should define
     // the function somewhere (GNU gas has no problem without this, but
     // Intel ias rightly complains of an 'undefined symbol')

     if(F /*&& isBRCALLinsn*/ && F->isExternal())
       ExternalFunctionNames.insert(Mang->getValueName(MO.getGlobal()));
     else
       if(GV->isExternal()) // e.g. stuff like 'stdin'
 	ExternalObjectNames.insert(Mang->getValueName(MO.getGlobal()));

     if (!isBRCALLinsn)
       O << "@ltoff(";
     if (Needfptr)
       O << "@fptr(";
     O << Mang->getValueName(MO.getGlobal());
     if (Needfptr)
       O << ")"; // close fptr(
     if (!isBRCALLinsn)
       O << ")"; // close ltoff(
     int Offset = MO.getOffset();
     if (Offset > 0)
       O << " + " << Offset;
     else if (Offset < 0)
       O << " - " << -Offset;
     return;
   }
   case MachineOperand::MO_ExternalSymbol:
     O << MO.getSymbolName();
     ExternalFunctionNames.insert(MO.getSymbolName());
     return;
   default:
     O << "<AsmPrinter: unknown operand type: " << MO.getType() << " >"; return;
   }
 }

 /// printMachineInstruction -- Print out a single IA64 LLVM instruction
 /// MI to the current output stream.
 ///
 void IA64AsmPrinter::printMachineInstruction(const MachineInstr *MI) {

   ++EmittedInsts;

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

 bool IA64AsmPrinter::doInitialization(Module &M) {
   AsmPrinter::doInitialization(M);

   O << "\n.ident \"LLVM-ia64\"\n\n"
     << "\t.psr	  lsb\n"  // should be "msb" on HP-UX, for starters
     << "\t.radix  C\n"
     << "\t.psr	  abi64\n"; // we only support 64 bits for now
   return false;
 }

 /// createIA64CodePrinterPass - Returns a pass that prints the IA64
 /// assembly code for a MachineFunction to the given output stream, using
 /// the given target machine description.
 ///
 FunctionPass *llvm::createIA64CodePrinterPass(std::ostream &o,TargetMachine &tm){
   return new IA64AsmPrinter(o, tm);
 }
	//===-- IA64AsmPrinter.cpp - Print out IA64 LLVM as assembly --------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file was developed by Duraid Madina 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 assembly accepted by the GNU binutils 'gas'
	// assembler. The Intel 'ias' and HP-UX 'as' assemblers may choke on this
	// output, but if so that's a bug I'd like to hear about: please file a bug
	// report in bugzilla. FYI, the excellent 'ias' assembler is bundled with
	// the Intel C/C++ compiler for Itanium Linux.
	//
	//===----------------------------------------------------------------------===//

	#include "IA64.h"
	#include "IA64TargetMachine.h"
	#include "llvm/Module.h"
	#include "llvm/Type.h"
	#include "llvm/Assembly/Writer.h"
	#include "llvm/CodeGen/AsmPrinter.h"
	#include "llvm/CodeGen/MachineConstantPool.h"
	#include "llvm/CodeGen/MachineFunctionPass.h"
	#include "llvm/CodeGen/ValueTypes.h"
	#include "llvm/Target/TargetMachine.h"
	#include "llvm/Support/Mangler.h"
	#include "llvm/ADT/Statistic.h"
	#include "llvm/Support/CommandLine.h"
	using namespace llvm;

	namespace {
	Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");

	struct IA64SharedAsmPrinter : public AsmPrinter {

	std::set<std::string> ExternalFunctionNames, ExternalObjectNames;

	IA64SharedAsmPrinter(std::ostream &O, TargetMachine &TM)
	: AsmPrinter(O, TM) { }

	void printConstantPool(MachineConstantPool *MCP);
	bool doFinalization(Module &M);
	};
	}

	static bool isScale(const MachineOperand &MO) {
	return MO.isImmediate() &&
	(MO.getImmedValue() == 1 \|\| MO.getImmedValue() == 2 \|\|
	MO.getImmedValue() == 4 \|\| MO.getImmedValue() == 8);
	}

	static bool isMem(const MachineInstr *MI, unsigned Op) {
	if (MI->getOperand(Op).isFrameIndex()) return true;
	if (MI->getOperand(Op).isConstantPoolIndex()) return true;
	return Op+4 <= MI->getNumOperands() &&
	MI->getOperand(Op ).isRegister() && isScale(MI->getOperand(Op+1)) &&
	MI->getOperand(Op+2).isRegister() && (MI->getOperand(Op+3).isImmediate() \|\|
	MI->getOperand(Op+3).isGlobalAddress());
	}

	// SwitchSection - Switch to the specified section of the executable if we are
	// not already in it!
	//
	static void SwitchSection(std::ostream &OS, std::string &CurSection,
	const char *NewSection) {
	if (CurSection != NewSection) {
	CurSection = NewSection;
	if (!CurSection.empty())
	OS << "\t" << NewSection << "\n";
	}
	}

	/// printConstantPool - Print to the current output stream assembly
	/// representations of the constants in the constant pool MCP. This is
	/// used to print out constants which have been "spilled to memory" by
	/// the code generator.
	///
	void IA64SharedAsmPrinter::printConstantPool(MachineConstantPool *MCP) {
	const std::vector<Constant*> &CP = MCP->getConstants();
	const TargetData &TD = TM.getTargetData();

	if (CP.empty()) return;

	O << "\n\t.section .data, \"aw\", \"progbits\"\n";
	// FIXME: would be nice to have rodata (no 'w') when appropriate?
	for (unsigned i = 0, e = CP.size(); i != e; ++i) {
	emitAlignment(TD.getTypeAlignmentShift(CP[i]->getType()));
	O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t" << CommentString
	<< *CP[i] << "\n";
	emitGlobalConstant(CP[i]);
	}
	}

	bool IA64SharedAsmPrinter::doFinalization(Module &M) {
	const TargetData &TD = TM.getTargetData();
	std::string CurSection;

	// 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->hasInitializer()) { // External global require no code
	O << "\n\n";
	std::string name = Mang->getValueName(I);
	Constant *C = I->getInitializer();
	unsigned Size = TD.getTypeSize(C->getType());
	unsigned Align = TD.getTypeAlignmentShift(C->getType());

	if (C->isNullValue() &&
	(I->hasLinkOnceLinkage() \|\| I->hasInternalLinkage() \|\|
	I->hasWeakLinkage() /* FIXME: Verify correct */)) {
	SwitchSection(O, CurSection, ".data");
	if (I->hasInternalLinkage()) {
	O << "\t.lcomm " << name << "," << TD.getTypeSize(C->getType())
	<< "," << (1 << Align);
	O << "\t\t// ";
	} else {
	O << "\t.common " << name << "," << TD.getTypeSize(C->getType())
	<< "," << (1 << Align);
	O << "\t\t// ";
	}
	WriteAsOperand(O, I, true, true, &M);
	O << "\n";
	} else {
	switch (I->getLinkage()) {
	case GlobalValue::LinkOnceLinkage:
	case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
	// Nonnull linkonce -> weak
	O << "\t.weak " << name << "\n";
	SwitchSection(O, CurSection, "");
	O << "\t.section\t.llvm.linkonce.d." << name
	<< ", \"aw\", \"progbits\"\n";
	break;
	case GlobalValue::AppendingLinkage:
	// FIXME: appending linkage variables should go into a section of
	// their name or something. For now, just emit them as external.
	case GlobalValue::ExternalLinkage:
	// If external or appending, declare as a global symbol
	O << "\t.global " << name << "\n";
	// FALL THROUGH
	case GlobalValue::InternalLinkage:
	if (C->isNullValue())
	SwitchSection(O, CurSection, ".bss");
	else
	SwitchSection(O, CurSection, ".data");
	break;
	case GlobalValue::GhostLinkage:
	std::cerr << "GhostLinkage cannot appear in IA64AsmPrinter!\n";
	abort();
	}

	emitAlignment(Align);
	O << "\t.type " << name << ",@object\n";
	O << "\t.size " << name << "," << Size << "\n";
	O << name << ":\t\t\t\t// ";
	WriteAsOperand(O, I, true, true, &M);
	O << " = ";
	WriteAsOperand(O, C, false, false, &M);
	O << "\n";
	emitGlobalConstant(C);
	}
	}

	// we print out ".global X \n .type X, @function" for each external function
	O << "\n\n// br.call targets referenced (and not defined) above: \n";
	for (std::set<std::string>::iterator i = ExternalFunctionNames.begin(),
	e = ExternalFunctionNames.end(); i!=e; ++i) {
	O << "\t.global " << i << "\n\t.type " << i << ", @function\n";
	}
	O << "\n\n";

	// we print out ".global X \n .type X, @object" for each external object
	O << "\n\n// (external) symbols referenced (and not defined) above: \n";
	for (std::set<std::string>::iterator i = ExternalObjectNames.begin(),
	e = ExternalObjectNames.end(); i!=e; ++i) {
	O << "\t.global " << i << "\n\t.type " << i << ", @object\n";
	}
	O << "\n\n";

	AsmPrinter::doFinalization(M);
	return false; // success
	}

	namespace {
	struct IA64AsmPrinter : public IA64SharedAsmPrinter {
	IA64AsmPrinter(std::ostream &O, TargetMachine &TM)
	: IA64SharedAsmPrinter(O, TM) {

	CommentString = "//";
	Data8bitsDirective = "\tdata1\t"; // FIXME: check that we are
	Data16bitsDirective = "\tdata2.ua\t"; // disabling auto-alignment
	Data32bitsDirective = "\tdata4.ua\t"; // properly
	Data64bitsDirective = "\tdata8.ua\t";
	ZeroDirective = "\t.skip\t";
	AsciiDirective = "\tstring\t";

	GlobalVarAddrPrefix="";
	GlobalVarAddrSuffix="";
	FunctionAddrPrefix="@fptr(";
	FunctionAddrSuffix=")";

	}

	virtual const char *getPassName() const {
	return "IA64 Assembly Printer";
	}

	/// printInstruction - This method is automatically generated by tablegen
	/// from the instruction set description. This method returns true if the
	/// machine instruction was sufficiently described to print it, otherwise it
	/// returns false.
	bool printInstruction(const MachineInstr *MI);

	// This method is used by the tablegen'erated instruction printer.
	void printOperand(const MachineInstr *MI, unsigned OpNo, MVT::ValueType VT){
	const MachineOperand &MO = MI->getOperand(OpNo);
	if (MO.getType() == MachineOperand::MO_MachineRegister) {
	assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physref??");
	//XXX Bug Workaround: See note in Printer::doInitialization about %.
	O << TM.getRegisterInfo()->get(MO.getReg()).Name;
	} else {
	printOp(MO);
	}
	}

	void printS8ImmOperand(const MachineInstr *MI, unsigned OpNo,
	MVT::ValueType VT) {
	int val=(unsigned int)MI->getOperand(OpNo).getImmedValue();
	if(val>=128) val=val-256; // if negative, flip sign
	O << val;
	}
	void printS14ImmOperand(const MachineInstr *MI, unsigned OpNo,
	MVT::ValueType VT) {
	int val=(unsigned int)MI->getOperand(OpNo).getImmedValue();
	if(val>=8192) val=val-16384; // if negative, flip sign
	O << val;
	}
	void printS22ImmOperand(const MachineInstr *MI, unsigned OpNo,
	MVT::ValueType VT) {
	int val=(unsigned int)MI->getOperand(OpNo).getImmedValue();
	if(val>=2097152) val=val-4194304; // if negative, flip sign
	O << val;
	}
	void printU64ImmOperand(const MachineInstr *MI, unsigned OpNo,
	MVT::ValueType VT) {
	O << (uint64_t)MI->getOperand(OpNo).getImmedValue();
	}
	void printS64ImmOperand(const MachineInstr *MI, unsigned OpNo,
	MVT::ValueType VT) {
	O << (int64_t)MI->getOperand(OpNo).getImmedValue();
	}

	void printCallOperand(const MachineInstr *MI, unsigned OpNo,
	MVT::ValueType VT) {
	printOp(MI->getOperand(OpNo), true); // this is a br.call instruction
	}

	void printMachineInstruction(const MachineInstr *MI);
	void printOp(const MachineOperand &MO, bool isBRCALLinsn= false);
	bool runOnMachineFunction(MachineFunction &F);
	bool doInitialization(Module &M);
	};
	} // end of anonymous namespace


	// Include the auto-generated portion of the assembly writer.
	#include "IA64GenAsmWriter.inc"


	/// runOnMachineFunction - This uses the printMachineInstruction()
	/// method to print assembly for each instruction.
	///
	bool IA64AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
	setupMachineFunction(MF);
	O << "\n\n";

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

	// Print out labels for the function.
	O << "\n\t.section .text, \"ax\", \"progbits\"\n";
	// ^^ means "Allocated instruXions in mem, initialized"
	emitAlignment(5);
	O << "\t.global\t" << CurrentFnName << "\n";
	O << "\t.type\t" << CurrentFnName << ", @function\n";
	O << CurrentFnName << ":\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())
	O << ".LBB" << CurrentFnName << "_" << I->getNumber() << ":\t"
	<< CommentString << " " << I->getBasicBlock()->getName() << "\n";
	for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
	II != E; ++II) {
	// Print the assembly for the instruction.
	O << "\t";
	printMachineInstruction(II);
	}
	}

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

	void IA64AsmPrinter::printOp(const MachineOperand &MO,
	bool isBRCALLinsn /* = false */) {
	const MRegisterInfo &RI = *TM.getRegisterInfo();
	switch (MO.getType()) {
	case MachineOperand::MO_VirtualRegister:
	if (Value *V = MO.getVRegValueOrNull()) {
	O << "<" << V->getName() << ">";
	return;
	}
	// FALLTHROUGH
	case MachineOperand::MO_MachineRegister:
	case MachineOperand::MO_CCRegister: {
	O << RI.get(MO.getReg()).Name;
	return;
	}

	case MachineOperand::MO_SignExtendedImmed:
	case MachineOperand::MO_UnextendedImmed:
	O << /(unsigned int)/MO.getImmedValue();
	return;
	case MachineOperand::MO_MachineBasicBlock: {
	MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
	O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction())
	<< "_" << MBBOp->getNumber () << "\t// "
	<< MBBOp->getBasicBlock ()->getName ();
	return;
	}
	case MachineOperand::MO_PCRelativeDisp:
	std::cerr << "Shouldn't use addPCDisp() when building IA64 MachineInstrs";
	abort ();
	return;

	case MachineOperand::MO_ConstantPoolIndex: {
	O << "@gprel(.CPI" << CurrentFnName << "_"
	<< MO.getConstantPoolIndex() << ")";
	return;
	}

	case MachineOperand::MO_GlobalAddress: {

	// functions need @ltoff(@fptr(fn_name)) form
	GlobalValue *GV = MO.getGlobal();
	Function *F = dyn_cast<Function>(GV);

	bool Needfptr=false; // if we're computing an address @ltoff(X), do
	// we need to decorate it so it becomes
	// @ltoff(@fptr(X)) ?
	if(F && !isBRCALLinsn /&& F->isExternal()/)
	Needfptr=true;

	// if this is the target of a call instruction, we should define
	// the function somewhere (GNU gas has no problem without this, but
	// Intel ias rightly complains of an 'undefined symbol')

	if(F /&& isBRCALLinsn/ && F->isExternal())
	ExternalFunctionNames.insert(Mang->getValueName(MO.getGlobal()));
	else
	if(GV->isExternal()) // e.g. stuff like 'stdin'
	ExternalObjectNames.insert(Mang->getValueName(MO.getGlobal()));

	if (!isBRCALLinsn)
	O << "@ltoff(";
	if (Needfptr)
	O << "@fptr(";
	O << Mang->getValueName(MO.getGlobal());
	if (Needfptr)
	O << ")"; // close fptr(
	if (!isBRCALLinsn)
	O << ")"; // close ltoff(
	int Offset = MO.getOffset();
	if (Offset > 0)
	O << " + " << Offset;
	else if (Offset < 0)
	O << " - " << -Offset;
	return;
	}
	case MachineOperand::MO_ExternalSymbol:
	O << MO.getSymbolName();
	ExternalFunctionNames.insert(MO.getSymbolName());
	return;
	default:
	O << "<AsmPrinter: unknown operand type: " << MO.getType() << " >"; return;
	}
	}

	/// printMachineInstruction -- Print out a single IA64 LLVM instruction
	/// MI to the current output stream.
	///
	void IA64AsmPrinter::printMachineInstruction(const MachineInstr *MI) {

	++EmittedInsts;

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

	bool IA64AsmPrinter::doInitialization(Module &M) {
	AsmPrinter::doInitialization(M);

	O << "\n.ident \"LLVM-ia64\"\n\n"
	<< "\t.psr lsb\n" // should be "msb" on HP-UX, for starters
	<< "\t.radix C\n"
	<< "\t.psr abi64\n"; // we only support 64 bits for now
	return false;
	}

	/// createIA64CodePrinterPass - Returns a pass that prints the IA64
	/// assembly code for a MachineFunction to the given output stream, using
	/// the given target machine description.
	///
	FunctionPass *llvm::createIA64CodePrinterPass(std::ostream &o,TargetMachine &tm){
	return new IA64AsmPrinter(o, tm);
	}