utils/TableGen/IntrinsicEmitter.cpp - llvm - Git at Google

 //===- IntrinsicEmitter.cpp - Generate intrinsic information --------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file was developed by Chris Lattner and is distributed under
 // the University of Illinois Open Source License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This tablegen backend emits information about intrinsic functions.
 //
 //===----------------------------------------------------------------------===//

 #include "IntrinsicEmitter.h"
 #include "Record.h"
 #include "llvm/ADT/StringExtras.h"
 #include <algorithm>
 using namespace llvm;

 //===----------------------------------------------------------------------===//
 // IntrinsicEmitter Implementation
 //===----------------------------------------------------------------------===//

 void IntrinsicEmitter::run(std::ostream &OS) {
   EmitSourceFileHeader("Intrinsic Function Source Fragment", OS);

   std::vector<CodeGenIntrinsic> Ints = LoadIntrinsics(Records);

   // Emit the enum information.
   EmitEnumInfo(Ints, OS);

   // Emit the intrinsic ID -> name table.
   EmitIntrinsicToNameTable(Ints, OS);

   // Emit the function name recognizer.
   EmitFnNameRecognizer(Ints, OS);

   // Emit the intrinsic verifier.
   EmitVerifier(Ints, OS);

   // Emit the intrinsic declaration generator.
   EmitGenerator(Ints, OS);

   // Emit mod/ref info for each function.
   EmitModRefInfo(Ints, OS);

   // Emit table of non-memory accessing intrinsics.
   EmitNoMemoryInfo(Ints, OS);

   // Emit side effect info for each intrinsic.
   EmitSideEffectInfo(Ints, OS);

   // Emit a list of intrinsics with corresponding GCC builtins.
   EmitGCCBuiltinList(Ints, OS);

   // Emit code to translate GCC builtins into LLVM intrinsics.
   EmitIntrinsicToGCCBuiltinMap(Ints, OS);
 }

 void IntrinsicEmitter::EmitEnumInfo(const std::vector<CodeGenIntrinsic> &Ints,
                                     std::ostream &OS) {
   OS << "// Enum values for Intrinsics.h\n";
   OS << "#ifdef GET_INTRINSIC_ENUM_VALUES\n";
   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
     OS << "    " << Ints[i].EnumName;
     OS << ((i != e-1) ? ", " : "  ");
     OS << std::string(40-Ints[i].EnumName.size(), ' ')
       << "// " << Ints[i].Name << "\n";
   }
   OS << "#endif\n\n";
 }

 void IntrinsicEmitter::
 EmitFnNameRecognizer(const std::vector<CodeGenIntrinsic> &Ints,
                      std::ostream &OS) {
   // Build a function name -> intrinsic name mapping.
   std::map<std::string, unsigned> IntMapping;
   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
     IntMapping[Ints[i].Name] = i;

   OS << "// Function name -> enum value recognizer code.\n";
   OS << "#ifdef GET_FUNCTION_RECOGNIZER\n";
   OS << "  switch (Name[5]) {\n";
   OS << "  default:\n";
   // Emit the intrinsics in sorted order.
   char LastChar = 0;
   for (std::map<std::string, unsigned>::iterator I = IntMapping.begin(),
        E = IntMapping.end(); I != E; ++I) {
     if (I->first[5] != LastChar) {
       LastChar = I->first[5];
       OS << "    break;\n";
       OS << "  case '" << LastChar << "':\n";
     }

     // For overloaded intrinsics, only the prefix needs to match
     if (Ints[I->second].isOverloaded)
       OS << "    if (Len >= " << I->first.size()
        << " && !memcmp(Name, \"" << I->first << "\", " << I->first.size()
        << ")) return Intrinsic::" << Ints[I->second].EnumName << ";\n";
     else
       OS << "    if (Len == " << I->first.size()
          << " && !memcmp(Name, \"" << I->first << "\", Len)) return Intrinsic::"
          << Ints[I->second].EnumName << ";\n";
   }
   OS << "  }\n";
   OS << "#endif\n\n";
 }

 void IntrinsicEmitter::
 EmitIntrinsicToNameTable(const std::vector<CodeGenIntrinsic> &Ints,
                          std::ostream &OS) {
   OS << "// Intrinsic ID to name table\n";
   OS << "#ifdef GET_INTRINSIC_NAME_TABLE\n";
   OS << "  // Note that entry #0 is the invalid intrinsic!\n";
   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
     OS << "  \"" << Ints[i].Name << "\",\n";
   OS << "#endif\n\n";
 }

 static bool EmitTypeVerify(std::ostream &OS, Record *ArgType) {
   if (ArgType->getValueAsString("TypeVal") == "...")  return true;

   OS << "(int)" << ArgType->getValueAsString("TypeVal") << ", ";
   // If this is an integer type, check the width is correct.
   if (ArgType->isSubClassOf("LLVMIntegerType"))
     OS << ArgType->getValueAsInt("Width") << ", ";

   // If this is a vector type, check that the subtype and size are correct.
   else if (ArgType->isSubClassOf("LLVMVectorType")) {
     EmitTypeVerify(OS, ArgType->getValueAsDef("ElTy"));
     OS << ArgType->getValueAsInt("NumElts") << ", ";
   }

   return false;
 }

 static void EmitTypeGenerate(std::ostream &OS, Record *ArgType, unsigned ArgNo){
   if (ArgType->isSubClassOf("LLVMIntegerType")) {
     unsigned BitWidth = ArgType->getValueAsInt("Width");
     if (BitWidth == 0)
       OS << "Tys[" << ArgNo << "]";
     else
       OS << "IntegerType::get(" << BitWidth << ")";
   } else if (ArgType->isSubClassOf("LLVMVectorType")) {
     OS << "VectorType::get(";
     EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
     OS << ", " << ArgType->getValueAsInt("NumElts") << ")";
   } else if (ArgType->isSubClassOf("LLVMPointerType")) {
     OS << "PointerType::get(";
     EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
     OS << ")";
   } else if (ArgType->isSubClassOf("LLVMEmptyStructType")) {
     OS << "StructType::get(std::vector<const Type *>())";
   } else {
     OS << "Type::getPrimitiveType(";
     OS << ArgType->getValueAsString("TypeVal") << ")";
   }
 }

 /// RecordListComparator - Provide a determinstic comparator for lists of
 /// records.
 namespace {
   struct RecordListComparator {
     bool operator()(const std::vector<Record*> &LHS,
                     const std::vector<Record*> &RHS) const {
       unsigned i = 0;
       do {
         if (i == RHS.size()) return false;  // RHS is shorter than LHS.
         if (LHS[i] != RHS[i])
           return LHS[i]->getName() < RHS[i]->getName();
       } while (++i != LHS.size());

       return i != RHS.size();
     }
   };
 }

 void IntrinsicEmitter::EmitVerifier(const std::vector<CodeGenIntrinsic> &Ints,
                                     std::ostream &OS) {
   OS << "// Verifier::visitIntrinsicFunctionCall code.\n";
   OS << "#ifdef GET_INTRINSIC_VERIFIER\n";
   OS << "  switch (ID) {\n";
   OS << "  default: assert(0 && \"Invalid intrinsic!\");\n";

   // This checking can emit a lot of very common code.  To reduce the amount of
   // code that we emit, batch up cases that have identical types.  This avoids
   // problems where GCC can run out of memory compiling Verifier.cpp.
   typedef std::map<std::vector<Record*>, std::vector<unsigned>,
     RecordListComparator> MapTy;
   MapTy UniqueArgInfos;

   // Compute the unique argument type info.
   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
     UniqueArgInfos[Ints[i].ArgTypeDefs].push_back(i);

   // Loop through the array, emitting one comparison for each batch.
   for (MapTy::iterator I = UniqueArgInfos.begin(),
        E = UniqueArgInfos.end(); I != E; ++I) {
     for (unsigned i = 0, e = I->second.size(); i != e; ++i) {
       OS << "  case Intrinsic::" << Ints[I->second[i]].EnumName << ":\t\t// "
          << Ints[I->second[i]].Name << "\n";
     }

     const std::vector<Record*> &ArgTypes = I->first;
     OS << "    VerifyIntrinsicPrototype(ID, IF, ";
     bool VarArg = false;
     for (unsigned j = 0; j != ArgTypes.size(); ++j) {
       VarArg = EmitTypeVerify(OS, ArgTypes[j]);
       if (VarArg) {
         if ((j+1) != ArgTypes.size())
           throw "Var arg type not last argument";
         break;
       }
     }

     OS << (VarArg ? "-2);\n" : "-1);\n");
     OS << "    break;\n";
   }
   OS << "  }\n";
   OS << "#endif\n\n";
 }

 void IntrinsicEmitter::EmitGenerator(const std::vector<CodeGenIntrinsic> &Ints,
                                      std::ostream &OS) {
   OS << "// Code for generating Intrinsic function declarations.\n";
   OS << "#ifdef GET_INTRINSIC_GENERATOR\n";
   OS << "  switch (id) {\n";
   OS << "  default: assert(0 && \"Invalid intrinsic!\");\n";

   // Similar to GET_INTRINSIC_VERIFIER, batch up cases that have identical
   // types.
   typedef std::map<std::vector<Record*>, std::vector<unsigned>,
     RecordListComparator> MapTy;
   MapTy UniqueArgInfos;

   // Compute the unique argument type info.
   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
     UniqueArgInfos[Ints[i].ArgTypeDefs].push_back(i);

   // Loop through the array, emitting one generator for each batch.
   for (MapTy::iterator I = UniqueArgInfos.begin(),
        E = UniqueArgInfos.end(); I != E; ++I) {
     for (unsigned i = 0, e = I->second.size(); i != e; ++i) {
       OS << "  case Intrinsic::" << Ints[I->second[i]].EnumName << ":\t\t// "
          << Ints[I->second[i]].Name << "\n";
     }

     const std::vector<Record*> &ArgTypes = I->first;
     unsigned N = ArgTypes.size();

     if (ArgTypes[N-1]->getValueAsString("TypeVal") == "...") {
       OS << "    IsVarArg = true;\n";
       --N;
     }

     OS << "    ResultTy = ";
     EmitTypeGenerate(OS, ArgTypes[0], 0);
     OS << ";\n";

     for (unsigned j = 1; j != N; ++j) {
       OS << "    ArgTys.push_back(";
       EmitTypeGenerate(OS, ArgTypes[j], j);
       OS << ");\n";
     }

     OS << "    break;\n";
   }
   OS << "  }\n";
   OS << "#endif\n\n";
 }

 void IntrinsicEmitter::EmitModRefInfo(const std::vector<CodeGenIntrinsic> &Ints,
                                       std::ostream &OS) {
   OS << "// BasicAliasAnalysis code.\n";
   OS << "#ifdef GET_MODREF_BEHAVIOR\n";
   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
     switch (Ints[i].ModRef) {
     default: break;
     case CodeGenIntrinsic::NoMem:
       OS << "  NoMemoryTable->push_back(\"" << Ints[i].Name << "\");\n";
       break;
     case CodeGenIntrinsic::ReadArgMem:
     case CodeGenIntrinsic::ReadMem:
       OS << "  OnlyReadsMemoryTable->push_back(\"" << Ints[i].Name << "\");\n";
       break;
     }
   }
   OS << "#endif\n\n";
 }

 void IntrinsicEmitter::
 EmitNoMemoryInfo(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS) {
   OS << "// SelectionDAGIsel code.\n";
   OS << "#ifdef GET_NO_MEMORY_INTRINSICS\n";
   OS << "  switch (IntrinsicID) {\n";
   OS << "  default: break;\n";
   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
     switch (Ints[i].ModRef) {
     default: break;
     case CodeGenIntrinsic::NoMem:
       OS << "  case Intrinsic::" << Ints[i].EnumName << ":\n";
       break;
     }
   }
   OS << "    return true; // These intrinsics have no side effects.\n";
   OS << "  }\n";
   OS << "#endif\n\n";
 }

 void IntrinsicEmitter::
 EmitSideEffectInfo(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS){
   OS << "// Return true if doesn't access or only reads memory.\n";
   OS << "#ifdef GET_SIDE_EFFECT_INFO\n";
   OS << "  switch (IntrinsicID) {\n";
   OS << "  default: break;\n";
   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
     switch (Ints[i].ModRef) {
     default: break;
     case CodeGenIntrinsic::NoMem:
     case CodeGenIntrinsic::ReadArgMem:
     case CodeGenIntrinsic::ReadMem:
       OS << "  case Intrinsic::" << Ints[i].EnumName << ":\n";
       break;
     }
   }
   OS << "    return true; // These intrinsics have no side effects.\n";
   OS << "  }\n";
   OS << "#endif\n\n";
 }

 void IntrinsicEmitter::
 EmitGCCBuiltinList(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS){
   OS << "// Get the GCC builtin that corresponds to an LLVM intrinsic.\n";
   OS << "#ifdef GET_GCC_BUILTIN_NAME\n";
   OS << "  switch (F->getIntrinsicID()) {\n";
   OS << "  default: BuiltinName = \"\"; break;\n";
   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
     if (!Ints[i].GCCBuiltinName.empty()) {
       OS << "  case Intrinsic::" << Ints[i].EnumName << ": BuiltinName = \""
          << Ints[i].GCCBuiltinName << "\"; break;\n";
     }
   }
   OS << "  }\n";
   OS << "#endif\n\n";
 }

 void IntrinsicEmitter::
 EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,
                              std::ostream &OS) {
   typedef std::map<std::pair<std::string, std::string>, std::string> BIMTy;
   BIMTy BuiltinMap;
   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
     if (!Ints[i].GCCBuiltinName.empty()) {
       std::pair<std::string, std::string> Key(Ints[i].GCCBuiltinName,
                                               Ints[i].TargetPrefix);
       if (!BuiltinMap.insert(std::make_pair(Key, Ints[i].EnumName)).second)
         throw "Intrinsic '" + Ints[i].TheDef->getName() +
               "': duplicate GCC builtin name!";
     }
   }

   OS << "// Get the LLVM intrinsic that corresponds to a GCC builtin.\n";
   OS << "// This is used by the C front-end.  The GCC builtin name is passed\n";
   OS << "// in as BuiltinName, and a target prefix (e.g. 'ppc') is passed\n";
   OS << "// in as TargetPrefix.  The result is assigned to 'IntrinsicID'.\n";
   OS << "#ifdef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN\n";
   OS << "  if (0);\n";
   // Note: this could emit significantly better code if we cared.
   for (BIMTy::iterator I = BuiltinMap.begin(), E = BuiltinMap.end();I != E;++I){
     OS << "  else if (";
     if (!I->first.second.empty()) {
       // Emit this as a strcmp, so it can be constant folded by the FE.
       OS << "!strcmp(TargetPrefix, \"" << I->first.second << "\") &&\n"
          << "           ";
     }
     OS << "!strcmp(BuiltinName, \"" << I->first.first << "\"))\n";
     OS << "    IntrinsicID = Intrinsic::" << I->second << ";\n";
   }
   OS << "  else\n";
   OS << "    IntrinsicID = Intrinsic::not_intrinsic;\n";
   OS << "#endif\n\n";
 }
	//===- IntrinsicEmitter.cpp - Generate intrinsic information --------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file was developed by Chris Lattner and is distributed under
	// the University of Illinois Open Source License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// This tablegen backend emits information about intrinsic functions.
	//
	//===----------------------------------------------------------------------===//

	#include "IntrinsicEmitter.h"
	#include "Record.h"
	#include "llvm/ADT/StringExtras.h"
	#include <algorithm>
	using namespace llvm;

	//===----------------------------------------------------------------------===//
	// IntrinsicEmitter Implementation
	//===----------------------------------------------------------------------===//

	void IntrinsicEmitter::run(std::ostream &OS) {
	EmitSourceFileHeader("Intrinsic Function Source Fragment", OS);

	std::vector<CodeGenIntrinsic> Ints = LoadIntrinsics(Records);

	// Emit the enum information.
	EmitEnumInfo(Ints, OS);

	// Emit the intrinsic ID -> name table.
	EmitIntrinsicToNameTable(Ints, OS);

	// Emit the function name recognizer.
	EmitFnNameRecognizer(Ints, OS);

	// Emit the intrinsic verifier.
	EmitVerifier(Ints, OS);

	// Emit the intrinsic declaration generator.
	EmitGenerator(Ints, OS);

	// Emit mod/ref info for each function.
	EmitModRefInfo(Ints, OS);

	// Emit table of non-memory accessing intrinsics.
	EmitNoMemoryInfo(Ints, OS);

	// Emit side effect info for each intrinsic.
	EmitSideEffectInfo(Ints, OS);

	// Emit a list of intrinsics with corresponding GCC builtins.
	EmitGCCBuiltinList(Ints, OS);

	// Emit code to translate GCC builtins into LLVM intrinsics.
	EmitIntrinsicToGCCBuiltinMap(Ints, OS);
	}

	void IntrinsicEmitter::EmitEnumInfo(const std::vector<CodeGenIntrinsic> &Ints,
	std::ostream &OS) {
	OS << "// Enum values for Intrinsics.h\n";
	OS << "#ifdef GET_INTRINSIC_ENUM_VALUES\n";
	for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
	OS << " " << Ints[i].EnumName;
	OS << ((i != e-1) ? ", " : " ");
	OS << std::string(40-Ints[i].EnumName.size(), ' ')
	<< "// " << Ints[i].Name << "\n";
	}
	OS << "#endif\n\n";
	}

	void IntrinsicEmitter::
	EmitFnNameRecognizer(const std::vector<CodeGenIntrinsic> &Ints,
	std::ostream &OS) {
	// Build a function name -> intrinsic name mapping.
	std::map<std::string, unsigned> IntMapping;
	for (unsigned i = 0, e = Ints.size(); i != e; ++i)
	IntMapping[Ints[i].Name] = i;

	OS << "// Function name -> enum value recognizer code.\n";
	OS << "#ifdef GET_FUNCTION_RECOGNIZER\n";
	OS << " switch (Name[5]) {\n";
	OS << " default:\n";
	// Emit the intrinsics in sorted order.
	char LastChar = 0;
	for (std::map<std::string, unsigned>::iterator I = IntMapping.begin(),
	E = IntMapping.end(); I != E; ++I) {
	if (I->first[5] != LastChar) {
	LastChar = I->first[5];
	OS << " break;\n";
	OS << " case '" << LastChar << "':\n";
	}

	// For overloaded intrinsics, only the prefix needs to match
	if (Ints[I->second].isOverloaded)
	OS << " if (Len >= " << I->first.size()
	<< " && !memcmp(Name, \"" << I->first << "\", " << I->first.size()
	<< ")) return Intrinsic::" << Ints[I->second].EnumName << ";\n";
	else
	OS << " if (Len == " << I->first.size()
	<< " && !memcmp(Name, \"" << I->first << "\", Len)) return Intrinsic::"
	<< Ints[I->second].EnumName << ";\n";
	}
	OS << " }\n";
	OS << "#endif\n\n";
	}

	void IntrinsicEmitter::
	EmitIntrinsicToNameTable(const std::vector<CodeGenIntrinsic> &Ints,
	std::ostream &OS) {
	OS << "// Intrinsic ID to name table\n";
	OS << "#ifdef GET_INTRINSIC_NAME_TABLE\n";
	OS << " // Note that entry #0 is the invalid intrinsic!\n";
	for (unsigned i = 0, e = Ints.size(); i != e; ++i)
	OS << " \"" << Ints[i].Name << "\",\n";
	OS << "#endif\n\n";
	}

	static bool EmitTypeVerify(std::ostream &OS, Record *ArgType) {
	if (ArgType->getValueAsString("TypeVal") == "...") return true;

	OS << "(int)" << ArgType->getValueAsString("TypeVal") << ", ";
	// If this is an integer type, check the width is correct.
	if (ArgType->isSubClassOf("LLVMIntegerType"))
	OS << ArgType->getValueAsInt("Width") << ", ";

	// If this is a vector type, check that the subtype and size are correct.
	else if (ArgType->isSubClassOf("LLVMVectorType")) {
	EmitTypeVerify(OS, ArgType->getValueAsDef("ElTy"));
	OS << ArgType->getValueAsInt("NumElts") << ", ";
	}

	return false;
	}

	static void EmitTypeGenerate(std::ostream &OS, Record *ArgType, unsigned ArgNo){
	if (ArgType->isSubClassOf("LLVMIntegerType")) {
	unsigned BitWidth = ArgType->getValueAsInt("Width");
	if (BitWidth == 0)
	OS << "Tys[" << ArgNo << "]";
	else
	OS << "IntegerType::get(" << BitWidth << ")";
	} else if (ArgType->isSubClassOf("LLVMVectorType")) {
	OS << "VectorType::get(";
	EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
	OS << ", " << ArgType->getValueAsInt("NumElts") << ")";
	} else if (ArgType->isSubClassOf("LLVMPointerType")) {
	OS << "PointerType::get(";
	EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
	OS << ")";
	} else if (ArgType->isSubClassOf("LLVMEmptyStructType")) {
	OS << "StructType::get(std::vector<const Type *>())";
	} else {
	OS << "Type::getPrimitiveType(";
	OS << ArgType->getValueAsString("TypeVal") << ")";
	}
	}

	/// RecordListComparator - Provide a determinstic comparator for lists of
	/// records.
	namespace {
	struct RecordListComparator {
	bool operator()(const std::vector<Record*> &LHS,
	const std::vector<Record*> &RHS) const {
	unsigned i = 0;
	do {
	if (i == RHS.size()) return false; // RHS is shorter than LHS.
	if (LHS[i] != RHS[i])
	return LHS[i]->getName() < RHS[i]->getName();
	} while (++i != LHS.size());

	return i != RHS.size();
	}
	};
	}

	void IntrinsicEmitter::EmitVerifier(const std::vector<CodeGenIntrinsic> &Ints,
	std::ostream &OS) {
	OS << "// Verifier::visitIntrinsicFunctionCall code.\n";
	OS << "#ifdef GET_INTRINSIC_VERIFIER\n";
	OS << " switch (ID) {\n";
	OS << " default: assert(0 && \"Invalid intrinsic!\");\n";

	// This checking can emit a lot of very common code. To reduce the amount of
	// code that we emit, batch up cases that have identical types. This avoids
	// problems where GCC can run out of memory compiling Verifier.cpp.
	typedef std::map<std::vector<Record*>, std::vector<unsigned>,
	RecordListComparator> MapTy;
	MapTy UniqueArgInfos;

	// Compute the unique argument type info.
	for (unsigned i = 0, e = Ints.size(); i != e; ++i)
	UniqueArgInfos[Ints[i].ArgTypeDefs].push_back(i);

	// Loop through the array, emitting one comparison for each batch.
	for (MapTy::iterator I = UniqueArgInfos.begin(),
	E = UniqueArgInfos.end(); I != E; ++I) {
	for (unsigned i = 0, e = I->second.size(); i != e; ++i) {
	OS << " case Intrinsic::" << Ints[I->second[i]].EnumName << ":\t\t// "
	<< Ints[I->second[i]].Name << "\n";
	}

	const std::vector<Record*> &ArgTypes = I->first;
	OS << " VerifyIntrinsicPrototype(ID, IF, ";
	bool VarArg = false;
	for (unsigned j = 0; j != ArgTypes.size(); ++j) {
	VarArg = EmitTypeVerify(OS, ArgTypes[j]);
	if (VarArg) {
	if ((j+1) != ArgTypes.size())
	throw "Var arg type not last argument";
	break;
	}
	}

	OS << (VarArg ? "-2);\n" : "-1);\n");
	OS << " break;\n";
	}
	OS << " }\n";
	OS << "#endif\n\n";
	}

	void IntrinsicEmitter::EmitGenerator(const std::vector<CodeGenIntrinsic> &Ints,
	std::ostream &OS) {
	OS << "// Code for generating Intrinsic function declarations.\n";
	OS << "#ifdef GET_INTRINSIC_GENERATOR\n";
	OS << " switch (id) {\n";
	OS << " default: assert(0 && \"Invalid intrinsic!\");\n";

	// Similar to GET_INTRINSIC_VERIFIER, batch up cases that have identical
	// types.
	typedef std::map<std::vector<Record*>, std::vector<unsigned>,
	RecordListComparator> MapTy;
	MapTy UniqueArgInfos;

	// Compute the unique argument type info.
	for (unsigned i = 0, e = Ints.size(); i != e; ++i)
	UniqueArgInfos[Ints[i].ArgTypeDefs].push_back(i);

	// Loop through the array, emitting one generator for each batch.
	for (MapTy::iterator I = UniqueArgInfos.begin(),
	E = UniqueArgInfos.end(); I != E; ++I) {
	for (unsigned i = 0, e = I->second.size(); i != e; ++i) {
	OS << " case Intrinsic::" << Ints[I->second[i]].EnumName << ":\t\t// "
	<< Ints[I->second[i]].Name << "\n";
	}

	const std::vector<Record*> &ArgTypes = I->first;
	unsigned N = ArgTypes.size();

	if (ArgTypes[N-1]->getValueAsString("TypeVal") == "...") {
	OS << " IsVarArg = true;\n";
	--N;
	}

	OS << " ResultTy = ";
	EmitTypeGenerate(OS, ArgTypes[0], 0);
	OS << ";\n";

	for (unsigned j = 1; j != N; ++j) {
	OS << " ArgTys.push_back(";
	EmitTypeGenerate(OS, ArgTypes[j], j);
	OS << ");\n";
	}

	OS << " break;\n";
	}
	OS << " }\n";
	OS << "#endif\n\n";
	}

	void IntrinsicEmitter::EmitModRefInfo(const std::vector<CodeGenIntrinsic> &Ints,
	std::ostream &OS) {
	OS << "// BasicAliasAnalysis code.\n";
	OS << "#ifdef GET_MODREF_BEHAVIOR\n";
	for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
	switch (Ints[i].ModRef) {
	default: break;
	case CodeGenIntrinsic::NoMem:
	OS << " NoMemoryTable->push_back(\"" << Ints[i].Name << "\");\n";
	break;
	case CodeGenIntrinsic::ReadArgMem:
	case CodeGenIntrinsic::ReadMem:
	OS << " OnlyReadsMemoryTable->push_back(\"" << Ints[i].Name << "\");\n";
	break;
	}
	}
	OS << "#endif\n\n";
	}

	void IntrinsicEmitter::
	EmitNoMemoryInfo(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS) {
	OS << "// SelectionDAGIsel code.\n";
	OS << "#ifdef GET_NO_MEMORY_INTRINSICS\n";
	OS << " switch (IntrinsicID) {\n";
	OS << " default: break;\n";
	for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
	switch (Ints[i].ModRef) {
	default: break;
	case CodeGenIntrinsic::NoMem:
	OS << " case Intrinsic::" << Ints[i].EnumName << ":\n";
	break;
	}
	}
	OS << " return true; // These intrinsics have no side effects.\n";
	OS << " }\n";
	OS << "#endif\n\n";
	}

	void IntrinsicEmitter::
	EmitSideEffectInfo(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS){
	OS << "// Return true if doesn't access or only reads memory.\n";
	OS << "#ifdef GET_SIDE_EFFECT_INFO\n";
	OS << " switch (IntrinsicID) {\n";
	OS << " default: break;\n";
	for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
	switch (Ints[i].ModRef) {
	default: break;
	case CodeGenIntrinsic::NoMem:
	case CodeGenIntrinsic::ReadArgMem:
	case CodeGenIntrinsic::ReadMem:
	OS << " case Intrinsic::" << Ints[i].EnumName << ":\n";
	break;
	}
	}
	OS << " return true; // These intrinsics have no side effects.\n";
	OS << " }\n";
	OS << "#endif\n\n";
	}

	void IntrinsicEmitter::
	EmitGCCBuiltinList(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS){
	OS << "// Get the GCC builtin that corresponds to an LLVM intrinsic.\n";
	OS << "#ifdef GET_GCC_BUILTIN_NAME\n";
	OS << " switch (F->getIntrinsicID()) {\n";
	OS << " default: BuiltinName = \"\"; break;\n";
	for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
	if (!Ints[i].GCCBuiltinName.empty()) {
	OS << " case Intrinsic::" << Ints[i].EnumName << ": BuiltinName = \""
	<< Ints[i].GCCBuiltinName << "\"; break;\n";
	}
	}
	OS << " }\n";
	OS << "#endif\n\n";
	}

	void IntrinsicEmitter::
	EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,
	std::ostream &OS) {
	typedef std::map<std::pair<std::string, std::string>, std::string> BIMTy;
	BIMTy BuiltinMap;
	for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
	if (!Ints[i].GCCBuiltinName.empty()) {
	std::pair<std::string, std::string> Key(Ints[i].GCCBuiltinName,
	Ints[i].TargetPrefix);
	if (!BuiltinMap.insert(std::make_pair(Key, Ints[i].EnumName)).second)
	throw "Intrinsic '" + Ints[i].TheDef->getName() +
	"': duplicate GCC builtin name!";
	}
	}

	OS << "// Get the LLVM intrinsic that corresponds to a GCC builtin.\n";
	OS << "// This is used by the C front-end. The GCC builtin name is passed\n";
	OS << "// in as BuiltinName, and a target prefix (e.g. 'ppc') is passed\n";
	OS << "// in as TargetPrefix. The result is assigned to 'IntrinsicID'.\n";
	OS << "#ifdef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN\n";
	OS << " if (0);\n";
	// Note: this could emit significantly better code if we cared.
	for (BIMTy::iterator I = BuiltinMap.begin(), E = BuiltinMap.end();I != E;++I){
	OS << " else if (";
	if (!I->first.second.empty()) {
	// Emit this as a strcmp, so it can be constant folded by the FE.
	OS << "!strcmp(TargetPrefix, \"" << I->first.second << "\") &&\n"
	<< " ";
	}
	OS << "!strcmp(BuiltinName, \"" << I->first.first << "\"))\n";
	OS << " IntrinsicID = Intrinsic::" << I->second << ";\n";
	}
	OS << " else\n";
	OS << " IntrinsicID = Intrinsic::not_intrinsic;\n";
	OS << "#endif\n\n";
	}