include/llvm/CodeGen/ValueTypes.h - llvm - Git at Google

 //===- CodeGen/ValueTypes.h - Low-Level Target independ. types --*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines the set of low-level target independent types which various
 // values in the code generator are.  This allows the target specific behavior
 // of instructions to be described to target independent passes.
 //
 //===----------------------------------------------------------------------===//

 #ifndef LLVM_CODEGEN_VALUETYPES_H
 #define LLVM_CODEGEN_VALUETYPES_H

 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/MachineValueType.h"
 #include "llvm/Support/MathExtras.h"
 #include <cassert>
 #include <cstdint>
 #include <string>

 namespace llvm {

   class LLVMContext;
   class Type;

   /// Extended Value Type. Capable of holding value types which are not native
   /// for any processor (such as the i12345 type), as well as the types an MVT
   /// can represent.
   struct EVT {
   private:
     MVT V = MVT::INVALID_SIMPLE_VALUE_TYPE;
     Type *LLVMTy = nullptr;

   public:
     constexpr EVT() = default;
     constexpr EVT(MVT::SimpleValueType SVT) : V(SVT) {}
     constexpr EVT(MVT S) : V(S) {}

     bool operator==(EVT VT) const {
       return !(*this != VT);
     }
     bool operator!=(EVT VT) const {
       if (V.SimpleTy != VT.V.SimpleTy)
         return true;
       if (V.SimpleTy == MVT::INVALID_SIMPLE_VALUE_TYPE)
         return LLVMTy != VT.LLVMTy;
       return false;
     }

     /// Returns the EVT that represents a floating-point type with the given
     /// number of bits. There are two floating-point types with 128 bits - this
     /// returns f128 rather than ppcf128.
     static EVT getFloatingPointVT(unsigned BitWidth) {
       return MVT::getFloatingPointVT(BitWidth);
     }

     /// Returns the EVT that represents an integer with the given number of
     /// bits.
     static EVT getIntegerVT(LLVMContext &Context, unsigned BitWidth) {
       MVT M = MVT::getIntegerVT(BitWidth);
       if (M.SimpleTy != MVT::INVALID_SIMPLE_VALUE_TYPE)
         return M;
       return getExtendedIntegerVT(Context, BitWidth);
     }

     /// Returns the EVT that represents a vector NumElements in length, where
     /// each element is of type VT.
     static EVT getVectorVT(LLVMContext &Context, EVT VT, unsigned NumElements,
                            bool IsScalable = false) {
       MVT M = MVT::getVectorVT(VT.V, NumElements, IsScalable);
       if (M.SimpleTy != MVT::INVALID_SIMPLE_VALUE_TYPE)
         return M;

       assert(!IsScalable && "We don't support extended scalable types yet");
       return getExtendedVectorVT(Context, VT, NumElements);
     }

     /// Returns the EVT that represents a vector EC.Min elements in length,
     /// where each element is of type VT.
     static EVT getVectorVT(LLVMContext &Context, EVT VT, MVT::ElementCount EC) {
       MVT M = MVT::getVectorVT(VT.V, EC);
       if (M.SimpleTy != MVT::INVALID_SIMPLE_VALUE_TYPE)
         return M;
       assert (!EC.Scalable && "We don't support extended scalable types yet");
       return getExtendedVectorVT(Context, VT, EC.Min);
     }

     /// Return a vector with the same number of elements as this vector, but
     /// with the element type converted to an integer type with the same
     /// bitwidth.
     EVT changeVectorElementTypeToInteger() const {
       if (!isSimple()) {
         assert (!isScalableVector() &&
                 "We don't support extended scalable types yet");
         return changeExtendedVectorElementTypeToInteger();
       }
       MVT EltTy = getSimpleVT().getVectorElementType();
       unsigned BitWidth = EltTy.getSizeInBits();
       MVT IntTy = MVT::getIntegerVT(BitWidth);
       MVT VecTy = MVT::getVectorVT(IntTy, getVectorNumElements(),
                                    isScalableVector());
       assert(VecTy.SimpleTy != MVT::INVALID_SIMPLE_VALUE_TYPE &&
              "Simple vector VT not representable by simple integer vector VT!");
       return VecTy;
     }

     /// Return the type converted to an equivalently sized integer or vector
     /// with integer element type. Similar to changeVectorElementTypeToInteger,
     /// but also handles scalars.
     EVT changeTypeToInteger() {
       if (isVector())
         return changeVectorElementTypeToInteger();

       if (isSimple())
         return MVT::getIntegerVT(getSizeInBits());

       return changeExtendedTypeToInteger();
     }

     /// Test if the given EVT is simple (as opposed to being extended).
     bool isSimple() const {
       return V.SimpleTy != MVT::INVALID_SIMPLE_VALUE_TYPE;
     }

     /// Test if the given EVT is extended (as opposed to being simple).
     bool isExtended() const {
       return !isSimple();
     }

     /// Return true if this is a FP or a vector FP type.
     bool isFloatingPoint() const {
       return isSimple() ? V.isFloatingPoint() : isExtendedFloatingPoint();
     }

     /// Return true if this is an integer or a vector integer type.
     bool isInteger() const {
       return isSimple() ? V.isInteger() : isExtendedInteger();
     }

     /// Return true if this is an integer, but not a vector.
     bool isScalarInteger() const {
       return isSimple() ? V.isScalarInteger() : isExtendedScalarInteger();
     }

     /// Return true if this is a vector value type.
     bool isVector() const {
       return isSimple() ? V.isVector() : isExtendedVector();
     }

     /// Return true if this is a vector type where the runtime
     /// length is machine dependent
     bool isScalableVector() const {
       // FIXME: We don't support extended scalable types yet, because the
       // matching IR type doesn't exist. Once it has been added, this can
       // be changed to call isExtendedScalableVector.
       if (!isSimple())
         return false;
       return V.isScalableVector();
     }

     /// Return true if this is a 16-bit vector type.
     bool is16BitVector() const {
       return isSimple() ? V.is16BitVector() : isExtended16BitVector();
     }

     /// Return true if this is a 32-bit vector type.
     bool is32BitVector() const {
       return isSimple() ? V.is32BitVector() : isExtended32BitVector();
     }

     /// Return true if this is a 64-bit vector type.
     bool is64BitVector() const {
       return isSimple() ? V.is64BitVector() : isExtended64BitVector();
     }

     /// Return true if this is a 128-bit vector type.
     bool is128BitVector() const {
       return isSimple() ? V.is128BitVector() : isExtended128BitVector();
     }

     /// Return true if this is a 256-bit vector type.
     bool is256BitVector() const {
       return isSimple() ? V.is256BitVector() : isExtended256BitVector();
     }

     /// Return true if this is a 512-bit vector type.
     bool is512BitVector() const {
       return isSimple() ? V.is512BitVector() : isExtended512BitVector();
     }

     /// Return true if this is a 1024-bit vector type.
     bool is1024BitVector() const {
       return isSimple() ? V.is1024BitVector() : isExtended1024BitVector();
     }

     /// Return true if this is a 2048-bit vector type.
     bool is2048BitVector() const {
       return isSimple() ? V.is2048BitVector() : isExtended2048BitVector();
     }

     /// Return true if this is an overloaded type for TableGen.
     bool isOverloaded() const {
       return (V==MVT::iAny || V==MVT::fAny || V==MVT::vAny || V==MVT::iPTRAny);
     }

     /// Return true if the bit size is a multiple of 8.
     bool isByteSized() const {
       return (getSizeInBits() & 7) == 0;
     }

     /// Return true if the size is a power-of-two number of bytes.
     bool isRound() const {
       unsigned BitSize = getSizeInBits();
       return BitSize >= 8 && !(BitSize & (BitSize - 1));
     }

     /// Return true if this has the same number of bits as VT.
     bool bitsEq(EVT VT) const {
       if (EVT::operator==(VT)) return true;
       return getSizeInBits() == VT.getSizeInBits();
     }

     /// Return true if this has more bits than VT.
     bool bitsGT(EVT VT) const {
       if (EVT::operator==(VT)) return false;
       return getSizeInBits() > VT.getSizeInBits();
     }

     /// Return true if this has no less bits than VT.
     bool bitsGE(EVT VT) const {
       if (EVT::operator==(VT)) return true;
       return getSizeInBits() >= VT.getSizeInBits();
     }

     /// Return true if this has less bits than VT.
     bool bitsLT(EVT VT) const {
       if (EVT::operator==(VT)) return false;
       return getSizeInBits() < VT.getSizeInBits();
     }

     /// Return true if this has no more bits than VT.
     bool bitsLE(EVT VT) const {
       if (EVT::operator==(VT)) return true;
       return getSizeInBits() <= VT.getSizeInBits();
     }

     /// Return the SimpleValueType held in the specified simple EVT.
     MVT getSimpleVT() const {
       assert(isSimple() && "Expected a SimpleValueType!");
       return V;
     }

     /// If this is a vector type, return the element type, otherwise return
     /// this.
     EVT getScalarType() const {
       return isVector() ? getVectorElementType() : *this;
     }

     /// Given a vector type, return the type of each element.
     EVT getVectorElementType() const {
       assert(isVector() && "Invalid vector type!");
       if (isSimple())
         return V.getVectorElementType();
       return getExtendedVectorElementType();
     }

     /// Given a vector type, return the number of elements it contains.
     unsigned getVectorNumElements() const {
       assert(isVector() && "Invalid vector type!");
       if (isSimple())
         return V.getVectorNumElements();
       return getExtendedVectorNumElements();
     }

     // Given a (possibly scalable) vector type, return the ElementCount
     MVT::ElementCount getVectorElementCount() const {
       assert((isVector()) && "Invalid vector type!");
       if (isSimple())
         return V.getVectorElementCount();

       assert(!isScalableVector() &&
              "We don't support extended scalable types yet");
       return {getExtendedVectorNumElements(), false};
     }

     /// Return the size of the specified value type in bits.
     unsigned getSizeInBits() const {
       if (isSimple())
         return V.getSizeInBits();
       return getExtendedSizeInBits();
     }

     unsigned getScalarSizeInBits() const {
       return getScalarType().getSizeInBits();
     }

     /// Return the number of bytes overwritten by a store of the specified value
     /// type.
     unsigned getStoreSize() const {
       return (getSizeInBits() + 7) / 8;
     }

     /// Return the number of bits overwritten by a store of the specified value
     /// type.
     unsigned getStoreSizeInBits() const {
       return getStoreSize() * 8;
     }

     /// Rounds the bit-width of the given integer EVT up to the nearest power of
     /// two (and at least to eight), and returns the integer EVT with that
     /// number of bits.
     EVT getRoundIntegerType(LLVMContext &Context) const {
       assert(isInteger() && !isVector() && "Invalid integer type!");
       unsigned BitWidth = getSizeInBits();
       if (BitWidth <= 8)
         return EVT(MVT::i8);
       return getIntegerVT(Context, 1 << Log2_32_Ceil(BitWidth));
     }

     /// Finds the smallest simple value type that is greater than or equal to
     /// half the width of this EVT. If no simple value type can be found, an
     /// extended integer value type of half the size (rounded up) is returned.
     EVT getHalfSizedIntegerVT(LLVMContext &Context) const {
       assert(isInteger() && !isVector() && "Invalid integer type!");
       unsigned EVTSize = getSizeInBits();
       for (unsigned IntVT = MVT::FIRST_INTEGER_VALUETYPE;
           IntVT <= MVT::LAST_INTEGER_VALUETYPE; ++IntVT) {
         EVT HalfVT = EVT((MVT::SimpleValueType)IntVT);
         if (HalfVT.getSizeInBits() * 2 >= EVTSize)
           return HalfVT;
       }
       return getIntegerVT(Context, (EVTSize + 1) / 2);
     }

     /// Return a VT for an integer vector type with the size of the
     /// elements doubled. The typed returned may be an extended type.
     EVT widenIntegerVectorElementType(LLVMContext &Context) const {
       EVT EltVT = getVectorElementType();
       EltVT = EVT::getIntegerVT(Context, 2 * EltVT.getSizeInBits());
       return EVT::getVectorVT(Context, EltVT, getVectorElementCount());
     }

     // Return a VT for a vector type with the same element type but
     // half the number of elements. The type returned may be an
     // extended type.
     EVT getHalfNumVectorElementsVT(LLVMContext &Context) const {
       EVT EltVT = getVectorElementType();
       auto EltCnt = getVectorElementCount();
       assert(!(EltCnt.Min & 1) && "Splitting vector, but not in half!");
       return EVT::getVectorVT(Context, EltVT, EltCnt / 2);
     }

     /// Returns true if the given vector is a power of 2.
     bool isPow2VectorType() const {
       unsigned NElts = getVectorNumElements();
       return !(NElts & (NElts - 1));
     }

     /// Widens the length of the given vector EVT up to the nearest power of 2
     /// and returns that type.
     EVT getPow2VectorType(LLVMContext &Context) const {
       if (!isPow2VectorType()) {
         unsigned NElts = getVectorNumElements();
         unsigned Pow2NElts = 1 <<  Log2_32_Ceil(NElts);
         return EVT::getVectorVT(Context, getVectorElementType(), Pow2NElts,
                                 isScalableVector());
       }
       else {
         return *this;
       }
     }

     /// This function returns value type as a string, e.g. "i32".
     std::string getEVTString() const;

     /// 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.
     Type *getTypeForEVT(LLVMContext &Context) const;

     /// Return the value type corresponding to the specified type.
     /// This returns all pointers as iPTR.  If HandleUnknown is true, unknown
     /// types are returned as Other, otherwise they are invalid.
     static EVT getEVT(Type *Ty, bool HandleUnknown = false);

     intptr_t getRawBits() const {
       if (isSimple())
         return V.SimpleTy;
       else
         return (intptr_t)(LLVMTy);
     }

     /// A meaningless but well-behaved order, useful for constructing
     /// containers.
     struct compareRawBits {
       bool operator()(EVT L, EVT R) const {
         if (L.V.SimpleTy == R.V.SimpleTy)
           return L.LLVMTy < R.LLVMTy;
         else
           return L.V.SimpleTy < R.V.SimpleTy;
       }
     };

   private:
     // Methods for handling the Extended-type case in functions above.
     // These are all out-of-line to prevent users of this header file
     // from having a dependency on Type.h.
     EVT changeExtendedTypeToInteger() const;
     EVT changeExtendedVectorElementTypeToInteger() const;
     static EVT getExtendedIntegerVT(LLVMContext &C, unsigned BitWidth);
     static EVT getExtendedVectorVT(LLVMContext &C, EVT VT,
                                    unsigned NumElements);
     bool isExtendedFloatingPoint() const LLVM_READONLY;
     bool isExtendedInteger() const LLVM_READONLY;
     bool isExtendedScalarInteger() const LLVM_READONLY;
     bool isExtendedVector() const LLVM_READONLY;
     bool isExtended16BitVector() const LLVM_READONLY;
     bool isExtended32BitVector() const LLVM_READONLY;
     bool isExtended64BitVector() const LLVM_READONLY;
     bool isExtended128BitVector() const LLVM_READONLY;
     bool isExtended256BitVector() const LLVM_READONLY;
     bool isExtended512BitVector() const LLVM_READONLY;
     bool isExtended1024BitVector() const LLVM_READONLY;
     bool isExtended2048BitVector() const LLVM_READONLY;
     EVT getExtendedVectorElementType() const;
     unsigned getExtendedVectorNumElements() const LLVM_READONLY;
     unsigned getExtendedSizeInBits() const LLVM_READONLY;
   };

 } // end namespace llvm

 #endif // LLVM_CODEGEN_VALUETYPES_H
	//===- CodeGen/ValueTypes.h - Low-Level Target independ. types --- C++ --===//
	//
	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
	// See https://llvm.org/LICENSE.txt for license information.
	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
	//
	//===----------------------------------------------------------------------===//
	//
	// This file defines the set of low-level target independent types which various
	// values in the code generator are. This allows the target specific behavior
	// of instructions to be described to target independent passes.
	//
	//===----------------------------------------------------------------------===//

	#ifndef LLVM_CODEGEN_VALUETYPES_H
	#define LLVM_CODEGEN_VALUETYPES_H

	#include "llvm/Support/Compiler.h"
	#include "llvm/Support/MachineValueType.h"
	#include "llvm/Support/MathExtras.h"
	#include <cassert>
	#include <cstdint>
	#include <string>

	namespace llvm {

	class LLVMContext;
	class Type;

	/// Extended Value Type. Capable of holding value types which are not native
	/// for any processor (such as the i12345 type), as well as the types an MVT
	/// can represent.
	struct EVT {
	private:
	MVT V = MVT::INVALID_SIMPLE_VALUE_TYPE;
	Type *LLVMTy = nullptr;

	public:
	constexpr EVT() = default;
	constexpr EVT(MVT::SimpleValueType SVT) : V(SVT) {}
	constexpr EVT(MVT S) : V(S) {}

	bool operator==(EVT VT) const {
	return !(*this != VT);
	}
	bool operator!=(EVT VT) const {
	if (V.SimpleTy != VT.V.SimpleTy)
	return true;
	if (V.SimpleTy == MVT::INVALID_SIMPLE_VALUE_TYPE)
	return LLVMTy != VT.LLVMTy;
	return false;
	}

	/// Returns the EVT that represents a floating-point type with the given
	/// number of bits. There are two floating-point types with 128 bits - this
	/// returns f128 rather than ppcf128.
	static EVT getFloatingPointVT(unsigned BitWidth) {
	return MVT::getFloatingPointVT(BitWidth);
	}

	/// Returns the EVT that represents an integer with the given number of
	/// bits.
	static EVT getIntegerVT(LLVMContext &Context, unsigned BitWidth) {
	MVT M = MVT::getIntegerVT(BitWidth);
	if (M.SimpleTy != MVT::INVALID_SIMPLE_VALUE_TYPE)
	return M;
	return getExtendedIntegerVT(Context, BitWidth);
	}

	/// Returns the EVT that represents a vector NumElements in length, where
	/// each element is of type VT.
	static EVT getVectorVT(LLVMContext &Context, EVT VT, unsigned NumElements,
	bool IsScalable = false) {
	MVT M = MVT::getVectorVT(VT.V, NumElements, IsScalable);
	if (M.SimpleTy != MVT::INVALID_SIMPLE_VALUE_TYPE)
	return M;

	assert(!IsScalable && "We don't support extended scalable types yet");
	return getExtendedVectorVT(Context, VT, NumElements);
	}

	/// Returns the EVT that represents a vector EC.Min elements in length,
	/// where each element is of type VT.
	static EVT getVectorVT(LLVMContext &Context, EVT VT, MVT::ElementCount EC) {
	MVT M = MVT::getVectorVT(VT.V, EC);
	if (M.SimpleTy != MVT::INVALID_SIMPLE_VALUE_TYPE)
	return M;
	assert (!EC.Scalable && "We don't support extended scalable types yet");
	return getExtendedVectorVT(Context, VT, EC.Min);
	}

	/// Return a vector with the same number of elements as this vector, but
	/// with the element type converted to an integer type with the same
	/// bitwidth.
	EVT changeVectorElementTypeToInteger() const {
	if (!isSimple()) {
	assert (!isScalableVector() &&
	"We don't support extended scalable types yet");
	return changeExtendedVectorElementTypeToInteger();
	}
	MVT EltTy = getSimpleVT().getVectorElementType();
	unsigned BitWidth = EltTy.getSizeInBits();
	MVT IntTy = MVT::getIntegerVT(BitWidth);
	MVT VecTy = MVT::getVectorVT(IntTy, getVectorNumElements(),
	isScalableVector());
	assert(VecTy.SimpleTy != MVT::INVALID_SIMPLE_VALUE_TYPE &&
	"Simple vector VT not representable by simple integer vector VT!");
	return VecTy;
	}

	/// Return the type converted to an equivalently sized integer or vector
	/// with integer element type. Similar to changeVectorElementTypeToInteger,
	/// but also handles scalars.
	EVT changeTypeToInteger() {
	if (isVector())
	return changeVectorElementTypeToInteger();

	if (isSimple())
	return MVT::getIntegerVT(getSizeInBits());

	return changeExtendedTypeToInteger();
	}

	/// Test if the given EVT is simple (as opposed to being extended).
	bool isSimple() const {
	return V.SimpleTy != MVT::INVALID_SIMPLE_VALUE_TYPE;
	}

	/// Test if the given EVT is extended (as opposed to being simple).
	bool isExtended() const {
	return !isSimple();
	}

	/// Return true if this is a FP or a vector FP type.
	bool isFloatingPoint() const {
	return isSimple() ? V.isFloatingPoint() : isExtendedFloatingPoint();
	}

	/// Return true if this is an integer or a vector integer type.
	bool isInteger() const {
	return isSimple() ? V.isInteger() : isExtendedInteger();
	}

	/// Return true if this is an integer, but not a vector.
	bool isScalarInteger() const {
	return isSimple() ? V.isScalarInteger() : isExtendedScalarInteger();
	}

	/// Return true if this is a vector value type.
	bool isVector() const {
	return isSimple() ? V.isVector() : isExtendedVector();
	}

	/// Return true if this is a vector type where the runtime
	/// length is machine dependent
	bool isScalableVector() const {
	// FIXME: We don't support extended scalable types yet, because the
	// matching IR type doesn't exist. Once it has been added, this can
	// be changed to call isExtendedScalableVector.
	if (!isSimple())
	return false;
	return V.isScalableVector();
	}

	/// Return true if this is a 16-bit vector type.
	bool is16BitVector() const {
	return isSimple() ? V.is16BitVector() : isExtended16BitVector();
	}

	/// Return true if this is a 32-bit vector type.
	bool is32BitVector() const {
	return isSimple() ? V.is32BitVector() : isExtended32BitVector();
	}

	/// Return true if this is a 64-bit vector type.
	bool is64BitVector() const {
	return isSimple() ? V.is64BitVector() : isExtended64BitVector();
	}

	/// Return true if this is a 128-bit vector type.
	bool is128BitVector() const {
	return isSimple() ? V.is128BitVector() : isExtended128BitVector();
	}

	/// Return true if this is a 256-bit vector type.
	bool is256BitVector() const {
	return isSimple() ? V.is256BitVector() : isExtended256BitVector();
	}

	/// Return true if this is a 512-bit vector type.
	bool is512BitVector() const {
	return isSimple() ? V.is512BitVector() : isExtended512BitVector();
	}

	/// Return true if this is a 1024-bit vector type.
	bool is1024BitVector() const {
	return isSimple() ? V.is1024BitVector() : isExtended1024BitVector();
	}

	/// Return true if this is a 2048-bit vector type.
	bool is2048BitVector() const {
	return isSimple() ? V.is2048BitVector() : isExtended2048BitVector();
	}

	/// Return true if this is an overloaded type for TableGen.
	bool isOverloaded() const {
	return (V==MVT::iAny \|\| V==MVT::fAny \|\| V==MVT::vAny \|\| V==MVT::iPTRAny);
	}

	/// Return true if the bit size is a multiple of 8.
	bool isByteSized() const {
	return (getSizeInBits() & 7) == 0;
	}

	/// Return true if the size is a power-of-two number of bytes.
	bool isRound() const {
	unsigned BitSize = getSizeInBits();
	return BitSize >= 8 && !(BitSize & (BitSize - 1));
	}

	/// Return true if this has the same number of bits as VT.
	bool bitsEq(EVT VT) const {
	if (EVT::operator==(VT)) return true;
	return getSizeInBits() == VT.getSizeInBits();
	}

	/// Return true if this has more bits than VT.
	bool bitsGT(EVT VT) const {
	if (EVT::operator==(VT)) return false;
	return getSizeInBits() > VT.getSizeInBits();
	}

	/// Return true if this has no less bits than VT.
	bool bitsGE(EVT VT) const {
	if (EVT::operator==(VT)) return true;
	return getSizeInBits() >= VT.getSizeInBits();
	}

	/// Return true if this has less bits than VT.
	bool bitsLT(EVT VT) const {
	if (EVT::operator==(VT)) return false;
	return getSizeInBits() < VT.getSizeInBits();
	}

	/// Return true if this has no more bits than VT.
	bool bitsLE(EVT VT) const {
	if (EVT::operator==(VT)) return true;
	return getSizeInBits() <= VT.getSizeInBits();
	}

	/// Return the SimpleValueType held in the specified simple EVT.
	MVT getSimpleVT() const {
	assert(isSimple() && "Expected a SimpleValueType!");
	return V;
	}

	/// If this is a vector type, return the element type, otherwise return
	/// this.
	EVT getScalarType() const {
	return isVector() ? getVectorElementType() : *this;
	}

	/// Given a vector type, return the type of each element.
	EVT getVectorElementType() const {
	assert(isVector() && "Invalid vector type!");
	if (isSimple())
	return V.getVectorElementType();
	return getExtendedVectorElementType();
	}

	/// Given a vector type, return the number of elements it contains.
	unsigned getVectorNumElements() const {
	assert(isVector() && "Invalid vector type!");
	if (isSimple())
	return V.getVectorNumElements();
	return getExtendedVectorNumElements();
	}

	// Given a (possibly scalable) vector type, return the ElementCount
	MVT::ElementCount getVectorElementCount() const {
	assert((isVector()) && "Invalid vector type!");
	if (isSimple())
	return V.getVectorElementCount();

	assert(!isScalableVector() &&
	"We don't support extended scalable types yet");
	return {getExtendedVectorNumElements(), false};
	}

	/// Return the size of the specified value type in bits.
	unsigned getSizeInBits() const {
	if (isSimple())
	return V.getSizeInBits();
	return getExtendedSizeInBits();
	}

	unsigned getScalarSizeInBits() const {
	return getScalarType().getSizeInBits();
	}

	/// Return the number of bytes overwritten by a store of the specified value
	/// type.
	unsigned getStoreSize() const {
	return (getSizeInBits() + 7) / 8;
	}

	/// Return the number of bits overwritten by a store of the specified value
	/// type.
	unsigned getStoreSizeInBits() const {
	return getStoreSize() * 8;
	}

	/// Rounds the bit-width of the given integer EVT up to the nearest power of
	/// two (and at least to eight), and returns the integer EVT with that
	/// number of bits.
	EVT getRoundIntegerType(LLVMContext &Context) const {
	assert(isInteger() && !isVector() && "Invalid integer type!");
	unsigned BitWidth = getSizeInBits();
	if (BitWidth <= 8)
	return EVT(MVT::i8);
	return getIntegerVT(Context, 1 << Log2_32_Ceil(BitWidth));
	}

	/// Finds the smallest simple value type that is greater than or equal to
	/// half the width of this EVT. If no simple value type can be found, an
	/// extended integer value type of half the size (rounded up) is returned.
	EVT getHalfSizedIntegerVT(LLVMContext &Context) const {
	assert(isInteger() && !isVector() && "Invalid integer type!");
	unsigned EVTSize = getSizeInBits();
	for (unsigned IntVT = MVT::FIRST_INTEGER_VALUETYPE;
	IntVT <= MVT::LAST_INTEGER_VALUETYPE; ++IntVT) {
	EVT HalfVT = EVT((MVT::SimpleValueType)IntVT);
	if (HalfVT.getSizeInBits() * 2 >= EVTSize)
	return HalfVT;
	}
	return getIntegerVT(Context, (EVTSize + 1) / 2);
	}

	/// Return a VT for an integer vector type with the size of the
	/// elements doubled. The typed returned may be an extended type.
	EVT widenIntegerVectorElementType(LLVMContext &Context) const {
	EVT EltVT = getVectorElementType();
	EltVT = EVT::getIntegerVT(Context, 2 * EltVT.getSizeInBits());
	return EVT::getVectorVT(Context, EltVT, getVectorElementCount());
	}

	// Return a VT for a vector type with the same element type but
	// half the number of elements. The type returned may be an
	// extended type.
	EVT getHalfNumVectorElementsVT(LLVMContext &Context) const {
	EVT EltVT = getVectorElementType();
	auto EltCnt = getVectorElementCount();
	assert(!(EltCnt.Min & 1) && "Splitting vector, but not in half!");
	return EVT::getVectorVT(Context, EltVT, EltCnt / 2);
	}

	/// Returns true if the given vector is a power of 2.
	bool isPow2VectorType() const {
	unsigned NElts = getVectorNumElements();
	return !(NElts & (NElts - 1));
	}

	/// Widens the length of the given vector EVT up to the nearest power of 2
	/// and returns that type.
	EVT getPow2VectorType(LLVMContext &Context) const {
	if (!isPow2VectorType()) {
	unsigned NElts = getVectorNumElements();
	unsigned Pow2NElts = 1 << Log2_32_Ceil(NElts);
	return EVT::getVectorVT(Context, getVectorElementType(), Pow2NElts,
	isScalableVector());
	}
	else {
	return *this;
	}
	}

	/// This function returns value type as a string, e.g. "i32".
	std::string getEVTString() const;

	/// 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.
	Type *getTypeForEVT(LLVMContext &Context) const;

	/// Return the value type corresponding to the specified type.
	/// This returns all pointers as iPTR. If HandleUnknown is true, unknown
	/// types are returned as Other, otherwise they are invalid.
	static EVT getEVT(Type *Ty, bool HandleUnknown = false);

	intptr_t getRawBits() const {
	if (isSimple())
	return V.SimpleTy;
	else
	return (intptr_t)(LLVMTy);
	}

	/// A meaningless but well-behaved order, useful for constructing
	/// containers.
	struct compareRawBits {
	bool operator()(EVT L, EVT R) const {
	if (L.V.SimpleTy == R.V.SimpleTy)
	return L.LLVMTy < R.LLVMTy;
	else
	return L.V.SimpleTy < R.V.SimpleTy;
	}
	};

	private:
	// Methods for handling the Extended-type case in functions above.
	// These are all out-of-line to prevent users of this header file
	// from having a dependency on Type.h.
	EVT changeExtendedTypeToInteger() const;
	EVT changeExtendedVectorElementTypeToInteger() const;
	static EVT getExtendedIntegerVT(LLVMContext &C, unsigned BitWidth);
	static EVT getExtendedVectorVT(LLVMContext &C, EVT VT,
	unsigned NumElements);
	bool isExtendedFloatingPoint() const LLVM_READONLY;
	bool isExtendedInteger() const LLVM_READONLY;
	bool isExtendedScalarInteger() const LLVM_READONLY;
	bool isExtendedVector() const LLVM_READONLY;
	bool isExtended16BitVector() const LLVM_READONLY;
	bool isExtended32BitVector() const LLVM_READONLY;
	bool isExtended64BitVector() const LLVM_READONLY;
	bool isExtended128BitVector() const LLVM_READONLY;
	bool isExtended256BitVector() const LLVM_READONLY;
	bool isExtended512BitVector() const LLVM_READONLY;
	bool isExtended1024BitVector() const LLVM_READONLY;
	bool isExtended2048BitVector() const LLVM_READONLY;
	EVT getExtendedVectorElementType() const;
	unsigned getExtendedVectorNumElements() const LLVM_READONLY;
	unsigned getExtendedSizeInBits() const LLVM_READONLY;
	};

	} // end namespace llvm

	#endif // LLVM_CODEGEN_VALUETYPES_H