llvm::GIConstant Class Reference

An integer-like constant. More...

#include "llvm/CodeGen/GlobalISel/Utils.h"

Public Types
enum class	GIConstantKind { Scalar , FixedVector , ScalableVector }

Public Member Functions
	GIConstant (ArrayRef< APInt > Values)
	GIConstant (const APInt &Value, GIConstantKind Kind)
GIConstantKind	getKind () const
	Returns the kind of of this constant, e.g, Scalar.
APInt	getScalarValue () const
	Returns the value, if this constant is a scalar.

Static Public Member Functions
static std::optional< GIConstant >	getConstant (Register Const, const MachineRegisterInfo &MRI)

Detailed Description

An integer-like constant.

It abstracts over scalar, fixed-length vectors, and scalable vectors. In the common case, it provides a common API and feels like an APInt, while still providing low-level access. It can be used for constant-folding.

bool isZero() abstracts over the kind.

switch(const.getKind()) { } provides low-level access.

Definition at line 606 of file Utils.h.

Member Enumeration Documentation

GIConstantKind

enum class llvm::GIConstant::GIConstantKind

strong

Enumerator
Scalar
FixedVector
ScalableVector

Definition at line 608 of file Utils.h.

Constructor & Destructor Documentation

GIConstant() [1/2]

llvm::GIConstant::GIConstant ( ArrayRef< APInt >  Values )

inline

Definition at line 616 of file Utils.h.

GIConstant() [2/2]

llvm::GIConstant::GIConstant ( const APInt &  Value, GIConstantKind  Kind  )

inline

Definition at line 618 of file Utils.h.

Member Function Documentation

getConstant()

std::optional< GIConstant > llvm::GIConstant::getConstant ( Register  Const, const MachineRegisterInfo &  MRI  )

static

Definition at line 1974 of file Utils.cpp.

References llvm::getDefIgnoringCopies(), llvm::getIConstantVRegValWithLookThrough(), I, MRI, llvm::SmallVectorTemplateBase< T, bool >::push_back(), ScalableVector, Scalar, and llvm::Splat.

Referenced by llvm::CombinerHelper::matchCanonicalizeICmp().

getKind()

GIConstantKind llvm::GIConstant::getKind ( ) const

inline

Returns the kind of of this constant, e.g, Scalar.

Definition at line 622 of file Utils.h.

getScalarValue()

APInt llvm::GIConstant::getScalarValue

(

)

const

Returns the value, if this constant is a scalar.

Definition at line 1967 of file Utils.cpp.

References assert(), and Scalar.

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The documentation for this class was generated from the following files:

• include/llvm/CodeGen/GlobalISel/Utils.h
• lib/CodeGen/GlobalISel/Utils.cpp