text: //===----------- ValueTypes.cpp - Implementation of EVT methods -----------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is distributed under the University of Illinois Open Source
  // License. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  //
  // This file implements methods in the CodeGen/ValueTypes.h header.
  //
  //===----------------------------------------------------------------------===//
  
  #include "llvm/ADT/StringExtras.h"
  #include "llvm/CodeGen/ValueTypes.h"
  #include "llvm/LLVMContext.h"
  #include "llvm/Type.h"
  #include "llvm/DerivedTypes.h"
  #include "llvm/Support/ErrorHandling.h"
  using namespace llvm;
  
  EVT EVT::getExtendedIntegerVT(LLVMContext &Context, unsigned BitWidth) {
    EVT VT;
    VT.LLVMTy = IntegerType::get(Context, BitWidth);
    assert(VT.isExtended() && "Type is not extended!");
    return VT;
  }
  
  EVT EVT::getExtendedVectorVT(LLVMContext &Context, EVT VT,
                               unsigned NumElements) {
    EVT ResultVT;
    ResultVT.LLVMTy = VectorType::get(VT.getTypeForEVT(Context), NumElements);
    assert(ResultVT.isExtended() && "Type is not extended!");
    return ResultVT;
  }
  
  bool EVT::isExtendedFloatingPoint() const {
    assert(isExtended() && "Type is not extended!");
    return LLVMTy->isFPOrFPVectorTy();
  }
  
  bool EVT::isExtendedInteger() const {
    assert(isExtended() && "Type is not extended!");
    return LLVMTy->isIntOrIntVectorTy();
  }
  
  bool EVT::isExtendedVector() const {
    assert(isExtended() && "Type is not extended!");
    return LLVMTy->isVectorTy();
  }
  
  bool EVT::isExtended64BitVector() const {
    return isExtendedVector() && getSizeInBits() == 64;
  }
  
  bool EVT::isExtended128BitVector() const {
    return isExtendedVector() && getSizeInBits() == 128;
  }
  
  bool EVT::isExtended256BitVector() const {
    return isExtendedVector() && getSizeInBits() == 256;
  }
  
  bool EVT::isExtended512BitVector() const {
    return isExtendedVector() && getSizeInBits() == 512;
  }
  
  EVT EVT::getExtendedVectorElementType() const {
    assert(isExtended() && "Type is not extended!");
    return EVT::getEVT(cast<VectorType>(LLVMTy)->getElementType());
  }
  
  unsigned EVT::getExtendedVectorNumElements() const {
    assert(isExtended() && "Type is not extended!");
    return cast<VectorType>(LLVMTy)->getNumElements();
  }
  
  unsigned EVT::getExtendedSizeInBits() const {
    assert(isExtended() && "Type is not extended!");
    if (const IntegerType *ITy = dyn_cast<IntegerType>(LLVMTy))
      return ITy->getBitWidth();
    if (const VectorType *VTy = dyn_cast<VectorType>(LLVMTy))
      return VTy->getBitWidth();
    assert(false && "Unrecognized extended type!");
    return 0; // Suppress warnings.
  }
  
  /// getEVTString - This function returns value type as a string, e.g. "i32".
  std::string EVT::getEVTString() const {
    switch (V.SimpleTy) {
    default:
      if (isVector())
        return "v" + utostr(getVectorNumElements()) +
               getVectorElementType().getEVTString();
      if (isInteger())
        return "i" + utostr(getSizeInBits());
      llvm_unreachable("Invalid EVT!");
      return "?";
    case MVT::i1:      return "i1";
    case MVT::i8:      return "i8";
    case MVT::i16:     return "i16";
    case MVT::i32:     return "i32";
    case MVT::i64:     return "i64";
    case MVT::i128:    return "i128";
    case MVT::f32:     return "f32";
    case MVT::f64:     return "f64";
    case MVT::f80:     return "f80";
    case MVT::f128:    return "f128";
    case MVT::ppcf128: return "ppcf128";
    case MVT::isVoid:  return "isVoid";
    case MVT::Other:   return "ch";
    case MVT::Flag:    return "flag";
    case MVT::v2i8:    return "v2i8";
    case MVT::v4i8:    return "v4i8";
    case MVT::v8i8:    return "v8i8";
    case MVT::v16i8:   return "v16i8";
    case MVT::v32i8:   return "v32i8";
    case MVT::v2i16:   return "v2i16";
    case MVT::v4i16:   return "v4i16";
    case MVT::v8i16:   return "v8i16";
    case MVT::v16i16:  return "v16i16";
    case MVT::v2i32:   return "v2i32";
    case MVT::v4i32:   return "v4i32";
    case MVT::v8i32:   return "v8i32";
    case MVT::v1i64:   return "v1i64";
    case MVT::v2i64:   return "v2i64";
    case MVT::v4i64:   return "v4i64";
    case MVT::v8i64:   return "v8i64";
    case MVT::v2f32:   return "v2f32";
    case MVT::v4f32:   return "v4f32";
    case MVT::v8f32:   return "v8f32";
    case MVT::v2f64:   return "v2f64";
    case MVT::v4f64:   return "v4f64";
    case MVT::Metadata:return "Metadata";
    }
  }
  
  /// getTypeForEVT - This method returns an LLVM type corresponding to the
  /// specified EVT.  For integer types, this returns an unsigned type.  Note
  /// that this will abort for types that cannot be represented.
  const Type *EVT::getTypeForEVT(LLVMContext &Context) const {
    switch (V.SimpleTy) {
    default:
      assert(isExtended() && "Type is not extended!");
      return LLVMTy;
    case MVT::isVoid:  return Type::getVoidTy(Context);
    case MVT::i1:      return Type::getInt1Ty(Context);
    case MVT::i8:      return Type::getInt8Ty(Context);
    case MVT::i16:     return Type::getInt16Ty(Context);
    case MVT::i32:     return Type::getInt32Ty(Context);
    case MVT::i64:     return Type::getInt64Ty(Context);
    case MVT::i128:    return IntegerType::get(Context, 128);
    case MVT::f32:     return Type::getFloatTy(Context);
    case MVT::f64:     return Type::getDoubleTy(Context);
    case MVT::f80:     return Type::getX86_FP80Ty(Context);
    case MVT::f128:    return Type::getFP128Ty(Context);
    case MVT::ppcf128: return Type::getPPC_FP128Ty(Context);
    case MVT::v2i8:    return VectorType::get(Type::getInt8Ty(Context), 2);
    case MVT::v4i8:    return VectorType::get(Type::getInt8Ty(Context), 4);
    case MVT::v8i8:    return VectorType::get(Type::getInt8Ty(Context), 8);
    case MVT::v16i8:   return VectorType::get(Type::getInt8Ty(Context), 16);
    case MVT::v32i8:   return VectorType::get(Type::getInt8Ty(Context), 32);
    case MVT::v2i16:   return VectorType::get(Type::getInt16Ty(Context), 2);
    case MVT::v4i16:   return VectorType::get(Type::getInt16Ty(Context), 4);
    case MVT::v8i16:   return VectorType::get(Type::getInt16Ty(Context), 8);
    case MVT::v16i16:  return VectorType::get(Type::getInt16Ty(Context), 16);
    case MVT::v2i32:   return VectorType::get(Type::getInt32Ty(Context), 2);
    case MVT::v4i32:   return VectorType::get(Type::getInt32Ty(Context), 4);
    case MVT::v8i32:   return VectorType::get(Type::getInt32Ty(Context), 8);
    case MVT::v1i64:   return VectorType::get(Type::getInt64Ty(Context), 1);
    case MVT::v2i64:   return VectorType::get(Type::getInt64Ty(Context), 2);
    case MVT::v4i64:   return VectorType::get(Type::getInt64Ty(Context), 4);
    case MVT::v8i64:   return VectorType::get(Type::getInt64Ty(Context), 8);
    case MVT::v2f32:   return VectorType::get(Type::getFloatTy(Context), 2);
    case MVT::v4f32:   return VectorType::get(Type::getFloatTy(Context), 4);
    case MVT::v8f32:   return VectorType::get(Type::getFloatTy(Context), 8);
    case MVT::v2f64:   return VectorType::get(Type::getDoubleTy(Context), 2);
    case MVT::v4f64:   return VectorType::get(Type::getDoubleTy(Context), 4); 
    case MVT::Metadata: return Type::getMetadataTy(Context);
   }
  }
  
  /// getEVT - Return the value type corresponding to the specified type.  This
  /// returns all pointers as MVT::iPTR.  If HandleUnknown is true, unknown types
  /// are returned as Other, otherwise they are invalid.
  EVT EVT::getEVT(const Type *Ty, bool HandleUnknown){
    switch (Ty->getTypeID()) {
    default:
      if (HandleUnknown) return MVT(MVT::Other);
      llvm_unreachable("Unknown type!");
      return MVT::isVoid;
    case Type::VoidTyID:
      return MVT::isVoid;
    case Type::IntegerTyID:
      return getIntegerVT(Ty->getContext(), cast<IntegerType>(Ty)->getBitWidth());
    case Type::FloatTyID:     return MVT(MVT::f32);
    case Type::DoubleTyID:    return MVT(MVT::f64);
    case Type::X86_FP80TyID:  return MVT(MVT::f80);
    case Type::FP128TyID:     return MVT(MVT::f128);
    case Type::PPC_FP128TyID: return MVT(MVT::ppcf128);
    case Type::PointerTyID:   return MVT(MVT::iPTR);
    case Type::VectorTyID: {
      const VectorType *VTy = cast<VectorType>(Ty);
      return getVectorVT(Ty->getContext(), getEVT(VTy->getElementType(), false),
                         VTy->getNumElements());
    }
    }
  }
  