utils/TableGen/IntrinsicEmitter.cpp - platform/external/llvm - Gitiles

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

 #include "CodeGenTarget.h"
 #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 the intrinsic parameter attributes.
   EmitAttributes(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() + 1) << ")) return Intrinsic::"
        << Ints[I->second].EnumName << ";\n";
     else
       OS << "    if (Len == " << I->first.size()
          << " && !memcmp(Name, \"" << I->first << "\", "
          << I->first.size() << ")) 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 void EmitTypeForValueType(std::ostream &OS, MVT::ValueType VT) {
   if (MVT::isInteger(VT)) {
     unsigned BitWidth = MVT::getSizeInBits(VT);
     OS << "IntegerType::get(" << BitWidth << ")";
   } else if (VT == MVT::Other) {
     // MVT::OtherVT is used to mean the empty struct type here.
     OS << "StructType::get(std::vector<const Type *>())";
   } else if (VT == MVT::f32) {
     OS << "Type::FloatTy";
   } else if (VT == MVT::f64) {
     OS << "Type::DoubleTy";
   } else if (VT == MVT::f80) {
     OS << "Type::X86_FP80Ty";
   } else if (VT == MVT::f128) {
     OS << "Type::FP128Ty";
   } else if (VT == MVT::ppcf128) {
     OS << "Type::PPC_FP128Ty";
   } else if (VT == MVT::isVoid) {
     OS << "Type::VoidTy";
   } else {
     assert(false && "Unsupported ValueType!");
   }
 }

 static void EmitTypeGenerate(std::ostream &OS, Record *ArgType,
                              unsigned &ArgNo) {
   MVT::ValueType VT = getValueType(ArgType->getValueAsDef("VT"));

   if (ArgType->isSubClassOf("LLVMMatchType")) {
     unsigned Number = ArgType->getValueAsInt("Number");
     assert(Number < ArgNo && "Invalid matching number!");
     OS << "Tys[" << Number << "]";
   } else if (VT == MVT::iAny || VT == MVT::fAny) {
     // NOTE: The ArgNo variable here is not the absolute argument number, it is
     // the index of the "arbitrary" type in the Tys array passed to the
     // Intrinsic::getDeclaration function. Consequently, we only want to
     // increment it when we actually hit an overloaded type. Getting this wrong
     // leads to very subtle bugs!
     OS << "Tys[" << ArgNo++ << "]";
   } else if (MVT::isVector(VT)) {
     OS << "VectorType::get(";
     EmitTypeForValueType(OS, MVT::getVectorElementType(VT));
     OS << ", " << MVT::getVectorNumElements(VT) << ")";
   } else if (VT == MVT::iPTR) {
     OS << "PointerType::getUnqual(";
     EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
     OS << ")";
   } else if (VT == MVT::isVoid) {
     if (ArgNo == 0)
       OS << "Type::VoidTy";
     else
       // MVT::isVoid is used to mean varargs here.
       OS << "...";
   } else {
     EmitTypeForValueType(OS, VT);
   }
 }

 /// 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, " << ArgTypes.size() << ", ";
     for (unsigned j = 0; j != ArgTypes.size(); ++j) {
       Record *ArgType = ArgTypes[j];
       if (ArgType->isSubClassOf("LLVMMatchType")) {
         unsigned Number = ArgType->getValueAsInt("Number");
         assert(Number < j && "Invalid matching number!");
         OS << "~" << Number;
       } else {
         MVT::ValueType VT = getValueType(ArgType->getValueAsDef("VT"));
         OS << getEnumName(VT);
         if (VT == MVT::isVoid && j != 0 && j != ArgTypes.size()-1)
           throw "Var arg type not last argument";
       }
       if (j != ArgTypes.size()-1)
         OS << ", ";
     }

     OS << ");\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 (N > 1 &&
         getValueType(ArgTypes[N-1]->getValueAsDef("VT")) == MVT::isVoid) {
       OS << "    IsVarArg = true;\n";
       --N;
     }

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

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

 void IntrinsicEmitter::
 EmitAttributes(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS) {
   OS << "// Add parameter attributes that are not common to all intrinsics.\n";
   OS << "#ifdef GET_INTRINSIC_ATTRIBUTES\n";
   OS << "  switch (id) {\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 << "    Attr |= ParamAttr::ReadNone; // These do not access memory.\n";
   OS << "    break;\n";
   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
     switch (Ints[i].ModRef) {
     default: break;
     case CodeGenIntrinsic::ReadArgMem:
     case CodeGenIntrinsic::ReadMem:
       OS << "  case Intrinsic::" << Ints[i].EnumName << ":\n";
       break;
     }
   }
   OS << "    Attr |= ParamAttr::ReadOnly; // These do not write memory.\n";
   OS << "    break;\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";
 }

 /// EmitBuiltinComparisons - Emit comparisons to determine whether the specified
 /// sorted range of builtin names is equal to the current builtin.  This breaks
 /// it down into a simple tree.
 ///
 /// At this point, we know that all the builtins in the range have the same name
 /// for the first 'CharStart' characters.  Only the end of the name needs to be
 /// discriminated.
 typedef std::map<std::string, std::string>::const_iterator StrMapIterator;
 static void EmitBuiltinComparisons(StrMapIterator Start, StrMapIterator End,
                                    unsigned CharStart, unsigned Indent,
                                    std::ostream &OS) {
   if (Start == End) return; // empty range.

   // Determine what, if anything, is the same about all these strings.
   std::string CommonString = Start->first;
   unsigned NumInRange = 0;
   for (StrMapIterator I = Start; I != End; ++I, ++NumInRange) {
     // Find the first character that doesn't match.
     const std::string &ThisStr = I->first;
     unsigned NonMatchChar = CharStart;
     while (NonMatchChar < CommonString.size() &&
            NonMatchChar < ThisStr.size() &&
            CommonString[NonMatchChar] == ThisStr[NonMatchChar])
       ++NonMatchChar;
     // Truncate off pieces that don't match.
     CommonString.resize(NonMatchChar);
   }

   // Just compare the rest of the string.
   if (NumInRange == 1) {
     if (CharStart != CommonString.size()) {
       OS << std::string(Indent*2, ' ') << "if (!memcmp(BuiltinName";
       if (CharStart) OS << "+" << CharStart;
       OS << ", \"" << (CommonString.c_str()+CharStart) << "\", ";
       OS << CommonString.size() - CharStart << "))\n";
       ++Indent;
     }
     OS << std::string(Indent*2, ' ') << "IntrinsicID = Intrinsic::";
     OS << Start->second << ";\n";
     return;
   }

   // At this point, we potentially have a common prefix for these builtins, emit
   // a check for this common prefix.
   if (CommonString.size() != CharStart) {
     OS << std::string(Indent*2, ' ') << "if (!memcmp(BuiltinName";
     if (CharStart) OS << "+" << CharStart;
     OS << ", \"" << (CommonString.c_str()+CharStart) << "\", ";
     OS << CommonString.size()-CharStart << ")) {\n";

     EmitBuiltinComparisons(Start, End, CommonString.size(), Indent+1, OS);
     OS << std::string(Indent*2, ' ') << "}\n";
     return;
   }

   // Output a switch on the character that differs across the set.
   OS << std::string(Indent*2, ' ') << "switch (BuiltinName[" << CharStart
       << "]) {";
   if (CharStart)
     OS << "  // \"" << std::string(Start->first.begin(),
                                    Start->first.begin()+CharStart) << "\"";
   OS << "\n";

   for (StrMapIterator I = Start; I != End; ) {
     char ThisChar = I->first[CharStart];
     OS << std::string(Indent*2, ' ') << "case '" << ThisChar << "':\n";
     // Figure out the range that has this common character.
     StrMapIterator NextChar = I;
     for (++NextChar; NextChar != End && NextChar->first[CharStart] == ThisChar;
          ++NextChar)
       /*empty*/;
     EmitBuiltinComparisons(I, NextChar, CharStart+1, Indent+1, OS);
     OS << std::string(Indent*2, ' ') << "  break;\n";
     I = NextChar;
   }
   OS << std::string(Indent*2, ' ') << "}\n";
 }

 /// EmitTargetBuiltins - All of the builtins in the specified map are for the
 /// same target, and we already checked it.
 static void EmitTargetBuiltins(const std::map<std::string, std::string> &BIM,
                                std::ostream &OS) {
   // Rearrange the builtins by length.
   std::vector<std::map<std::string, std::string> > BuiltinsByLen;
   BuiltinsByLen.reserve(100);

   for (StrMapIterator I = BIM.begin(), E = BIM.end(); I != E; ++I) {
     if (I->first.size() >= BuiltinsByLen.size())
       BuiltinsByLen.resize(I->first.size()+1);
     BuiltinsByLen[I->first.size()].insert(*I);
   }

   // Now that we have all the builtins by their length, emit a switch stmt.
   OS << "    switch (strlen(BuiltinName)) {\n";
   OS << "    default: break;\n";
   for (unsigned i = 0, e = BuiltinsByLen.size(); i != e; ++i) {
     if (BuiltinsByLen[i].empty()) continue;
     OS << "    case " << i << ":\n";
     EmitBuiltinComparisons(BuiltinsByLen[i].begin(), BuiltinsByLen[i].end(),
                            0, 3, OS);
     OS << "      break;\n";
   }
   OS << "    }\n";
 }


 void IntrinsicEmitter::
 EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,
                              std::ostream &OS) {
   typedef std::map<std::string, std::map<std::string, std::string> > BIMTy;
   BIMTy BuiltinMap;
   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
     if (!Ints[i].GCCBuiltinName.empty()) {
       // Get the map for this target prefix.
       std::map<std::string, std::string> &BIM =BuiltinMap[Ints[i].TargetPrefix];

       if (!BIM.insert(std::make_pair(Ints[i].GCCBuiltinName,
                                      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 << "  IntrinsicID = Intrinsic::not_intrinsic;\n";

   // Note: this could emit significantly better code if we cared.
   for (BIMTy::iterator I = BuiltinMap.begin(), E = BuiltinMap.end();I != E;++I){
     OS << "  ";
     if (!I->first.empty())
       OS << "if (!strcmp(TargetPrefix, \"" << I->first << "\")) ";
     else
       OS << "/* Target Independent Builtins */ ";
     OS << "{\n";

     // Emit the comparisons for this target prefix.
     EmitTargetBuiltins(I->second, OS);
     OS << "  }\n";
   }
   OS << "#endif\n\n";
 }
	//===- IntrinsicEmitter.cpp - Generate intrinsic information --------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// This tablegen backend emits information about intrinsic functions.
	//
	//===----------------------------------------------------------------------===//

	#include "CodeGenTarget.h"
	#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 the intrinsic parameter attributes.
	EmitAttributes(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() + 1) << ")) return Intrinsic::"
	<< Ints[I->second].EnumName << ";\n";
	else
	OS << " if (Len == " << I->first.size()
	<< " && !memcmp(Name, \"" << I->first << "\", "
	<< I->first.size() << ")) 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 void EmitTypeForValueType(std::ostream &OS, MVT::ValueType VT) {
	if (MVT::isInteger(VT)) {
	unsigned BitWidth = MVT::getSizeInBits(VT);
	OS << "IntegerType::get(" << BitWidth << ")";
	} else if (VT == MVT::Other) {
	// MVT::OtherVT is used to mean the empty struct type here.
	OS << "StructType::get(std::vector<const Type *>())";
	} else if (VT == MVT::f32) {
	OS << "Type::FloatTy";
	} else if (VT == MVT::f64) {
	OS << "Type::DoubleTy";
	} else if (VT == MVT::f80) {
	OS << "Type::X86_FP80Ty";
	} else if (VT == MVT::f128) {
	OS << "Type::FP128Ty";
	} else if (VT == MVT::ppcf128) {
	OS << "Type::PPC_FP128Ty";
	} else if (VT == MVT::isVoid) {
	OS << "Type::VoidTy";
	} else {
	assert(false && "Unsupported ValueType!");
	}
	}

	static void EmitTypeGenerate(std::ostream &OS, Record *ArgType,
	unsigned &ArgNo) {
	MVT::ValueType VT = getValueType(ArgType->getValueAsDef("VT"));

	if (ArgType->isSubClassOf("LLVMMatchType")) {
	unsigned Number = ArgType->getValueAsInt("Number");
	assert(Number < ArgNo && "Invalid matching number!");
	OS << "Tys[" << Number << "]";
	} else if (VT == MVT::iAny \|\| VT == MVT::fAny) {
	// NOTE: The ArgNo variable here is not the absolute argument number, it is
	// the index of the "arbitrary" type in the Tys array passed to the
	// Intrinsic::getDeclaration function. Consequently, we only want to
	// increment it when we actually hit an overloaded type. Getting this wrong
	// leads to very subtle bugs!
	OS << "Tys[" << ArgNo++ << "]";
	} else if (MVT::isVector(VT)) {
	OS << "VectorType::get(";
	EmitTypeForValueType(OS, MVT::getVectorElementType(VT));
	OS << ", " << MVT::getVectorNumElements(VT) << ")";
	} else if (VT == MVT::iPTR) {
	OS << "PointerType::getUnqual(";
	EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
	OS << ")";
	} else if (VT == MVT::isVoid) {
	if (ArgNo == 0)
	OS << "Type::VoidTy";
	else
	// MVT::isVoid is used to mean varargs here.
	OS << "...";
	} else {
	EmitTypeForValueType(OS, VT);
	}
	}

	/// 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, " << ArgTypes.size() << ", ";
	for (unsigned j = 0; j != ArgTypes.size(); ++j) {
	Record *ArgType = ArgTypes[j];
	if (ArgType->isSubClassOf("LLVMMatchType")) {
	unsigned Number = ArgType->getValueAsInt("Number");
	assert(Number < j && "Invalid matching number!");
	OS << "~" << Number;
	} else {
	MVT::ValueType VT = getValueType(ArgType->getValueAsDef("VT"));
	OS << getEnumName(VT);
	if (VT == MVT::isVoid && j != 0 && j != ArgTypes.size()-1)
	throw "Var arg type not last argument";
	}
	if (j != ArgTypes.size()-1)
	OS << ", ";
	}

	OS << ");\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 (N > 1 &&
	getValueType(ArgTypes[N-1]->getValueAsDef("VT")) == MVT::isVoid) {
	OS << " IsVarArg = true;\n";
	--N;
	}

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

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

	void IntrinsicEmitter::
	EmitAttributes(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS) {
	OS << "// Add parameter attributes that are not common to all intrinsics.\n";
	OS << "#ifdef GET_INTRINSIC_ATTRIBUTES\n";
	OS << " switch (id) {\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 << " Attr \|= ParamAttr::ReadNone; // These do not access memory.\n";
	OS << " break;\n";
	for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
	switch (Ints[i].ModRef) {
	default: break;
	case CodeGenIntrinsic::ReadArgMem:
	case CodeGenIntrinsic::ReadMem:
	OS << " case Intrinsic::" << Ints[i].EnumName << ":\n";
	break;
	}
	}
	OS << " Attr \|= ParamAttr::ReadOnly; // These do not write memory.\n";
	OS << " break;\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";
	}

	/// EmitBuiltinComparisons - Emit comparisons to determine whether the specified
	/// sorted range of builtin names is equal to the current builtin. This breaks
	/// it down into a simple tree.
	///
	/// At this point, we know that all the builtins in the range have the same name
	/// for the first 'CharStart' characters. Only the end of the name needs to be
	/// discriminated.
	typedef std::map<std::string, std::string>::const_iterator StrMapIterator;
	static void EmitBuiltinComparisons(StrMapIterator Start, StrMapIterator End,
	unsigned CharStart, unsigned Indent,
	std::ostream &OS) {
	if (Start == End) return; // empty range.

	// Determine what, if anything, is the same about all these strings.
	std::string CommonString = Start->first;
	unsigned NumInRange = 0;
	for (StrMapIterator I = Start; I != End; ++I, ++NumInRange) {
	// Find the first character that doesn't match.
	const std::string &ThisStr = I->first;
	unsigned NonMatchChar = CharStart;
	while (NonMatchChar < CommonString.size() &&
	NonMatchChar < ThisStr.size() &&
	CommonString[NonMatchChar] == ThisStr[NonMatchChar])
	++NonMatchChar;
	// Truncate off pieces that don't match.
	CommonString.resize(NonMatchChar);
	}

	// Just compare the rest of the string.
	if (NumInRange == 1) {
	if (CharStart != CommonString.size()) {
	OS << std::string(Indent*2, ' ') << "if (!memcmp(BuiltinName";
	if (CharStart) OS << "+" << CharStart;
	OS << ", \"" << (CommonString.c_str()+CharStart) << "\", ";
	OS << CommonString.size() - CharStart << "))\n";
	++Indent;
	}
	OS << std::string(Indent*2, ' ') << "IntrinsicID = Intrinsic::";
	OS << Start->second << ";\n";
	return;
	}

	// At this point, we potentially have a common prefix for these builtins, emit
	// a check for this common prefix.
	if (CommonString.size() != CharStart) {
	OS << std::string(Indent*2, ' ') << "if (!memcmp(BuiltinName";
	if (CharStart) OS << "+" << CharStart;
	OS << ", \"" << (CommonString.c_str()+CharStart) << "\", ";
	OS << CommonString.size()-CharStart << ")) {\n";

	EmitBuiltinComparisons(Start, End, CommonString.size(), Indent+1, OS);
	OS << std::string(Indent*2, ' ') << "}\n";
	return;
	}

	// Output a switch on the character that differs across the set.
	OS << std::string(Indent*2, ' ') << "switch (BuiltinName[" << CharStart
	<< "]) {";
	if (CharStart)
	OS << " // \"" << std::string(Start->first.begin(),
	Start->first.begin()+CharStart) << "\"";
	OS << "\n";

	for (StrMapIterator I = Start; I != End; ) {
	char ThisChar = I->first[CharStart];
	OS << std::string(Indent*2, ' ') << "case '" << ThisChar << "':\n";
	// Figure out the range that has this common character.
	StrMapIterator NextChar = I;
	for (++NextChar; NextChar != End && NextChar->first[CharStart] == ThisChar;
	++NextChar)
	/empty/;
	EmitBuiltinComparisons(I, NextChar, CharStart+1, Indent+1, OS);
	OS << std::string(Indent*2, ' ') << " break;\n";
	I = NextChar;
	}
	OS << std::string(Indent*2, ' ') << "}\n";
	}

	/// EmitTargetBuiltins - All of the builtins in the specified map are for the
	/// same target, and we already checked it.
	static void EmitTargetBuiltins(const std::map<std::string, std::string> &BIM,
	std::ostream &OS) {
	// Rearrange the builtins by length.
	std::vector<std::map<std::string, std::string> > BuiltinsByLen;
	BuiltinsByLen.reserve(100);

	for (StrMapIterator I = BIM.begin(), E = BIM.end(); I != E; ++I) {
	if (I->first.size() >= BuiltinsByLen.size())
	BuiltinsByLen.resize(I->first.size()+1);
	BuiltinsByLen[I->first.size()].insert(*I);
	}

	// Now that we have all the builtins by their length, emit a switch stmt.
	OS << " switch (strlen(BuiltinName)) {\n";
	OS << " default: break;\n";
	for (unsigned i = 0, e = BuiltinsByLen.size(); i != e; ++i) {
	if (BuiltinsByLen[i].empty()) continue;
	OS << " case " << i << ":\n";
	EmitBuiltinComparisons(BuiltinsByLen[i].begin(), BuiltinsByLen[i].end(),
	0, 3, OS);
	OS << " break;\n";
	}
	OS << " }\n";
	}


	void IntrinsicEmitter::
	EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,
	std::ostream &OS) {
	typedef std::map<std::string, std::map<std::string, std::string> > BIMTy;
	BIMTy BuiltinMap;
	for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
	if (!Ints[i].GCCBuiltinName.empty()) {
	// Get the map for this target prefix.
	std::map<std::string, std::string> &BIM =BuiltinMap[Ints[i].TargetPrefix];

	if (!BIM.insert(std::make_pair(Ints[i].GCCBuiltinName,
	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 << " IntrinsicID = Intrinsic::not_intrinsic;\n";

	// Note: this could emit significantly better code if we cared.
	for (BIMTy::iterator I = BuiltinMap.begin(), E = BuiltinMap.end();I != E;++I){
	OS << " ";
	if (!I->first.empty())
	OS << "if (!strcmp(TargetPrefix, \"" << I->first << "\")) ";
	else
	OS << "/* Target Independent Builtins */ ";
	OS << "{\n";

	// Emit the comparisons for this target prefix.
	EmitTargetBuiltins(I->second, OS);
	OS << " }\n";
	}
	OS << "#endif\n\n";
	}