This class represents lattice values for constants. More...

#include "llvm/Analysis/ValueLattice.h"

Classes
struct	MergeOptions
	Struct to control some aspects related to merging constant ranges. More...

Public Member Functions
	ValueLatticeElement ()

	~ValueLatticeElement ()

	ValueLatticeElement (const ValueLatticeElement &Other)

	ValueLatticeElement (ValueLatticeElement &&Other)

ValueLatticeElement &	operator= (const ValueLatticeElement &Other)

ValueLatticeElement &	operator= (ValueLatticeElement &&Other)

bool	isUndef () const

bool	isUnknown () const

bool	isUnknownOrUndef () const

bool	isConstant () const

bool	isNotConstant () const

bool	isConstantRangeIncludingUndef () const

bool	isConstantRange (bool UndefAllowed=true) const
	Returns true if this value is a constant range.

bool	isOverdefined () const

Constant *	getConstant () const

Constant *	getNotConstant () const

const ConstantRange &	getConstantRange (bool UndefAllowed=true) const
	Returns the constant range for this value.

std::optional< APInt >	asConstantInteger () const

ConstantRange	asConstantRange (unsigned BW, bool UndefAllowed=false) const

ConstantRange	asConstantRange (Type *Ty, bool UndefAllowed=false) const

bool	markOverdefined ()

bool	markUndef ()

bool	markConstant (Constant *V, bool MayIncludeUndef=false)

bool	markNotConstant (Constant *V)

bool	markConstantRange (ConstantRange NewR, MergeOptions Opts=MergeOptions())
	Mark the object as constant range with `NewR`.

bool	mergeIn (const ValueLatticeElement &RHS, MergeOptions Opts=MergeOptions())
	Updates this object to approximate both this object and RHS.

Constant *	getCompare (CmpInst::Predicate Pred, Type *Ty, const ValueLatticeElement &Other, const DataLayout &DL) const
	true, false or undef constants, or nullptr if the comparison cannot be evaluated.

unsigned	getNumRangeExtensions () const

void	setNumRangeExtensions (unsigned N)

Static Public Member Functions
static ValueLatticeElement	get (Constant *C)

static ValueLatticeElement	getNot (Constant *C)

static ValueLatticeElement	getRange (ConstantRange CR, bool MayIncludeUndef=false)

static ValueLatticeElement	getOverdefined ()

Detailed Description

This class represents lattice values for constants.

FIXME: This is basically just for bringup, this can be made a lot more rich in the future.

Definition at line 29 of file ValueLattice.h.

Constructor & Destructor Documentation

◆ ValueLatticeElement() [1/3]

llvm::ValueLatticeElement::ValueLatticeElement ( )

inline

Definition at line 148 of file ValueLattice.h.

Referenced by operator=().

◆ ~ValueLatticeElement()

llvm::ValueLatticeElement::~ValueLatticeElement ( )

inline

Definition at line 150 of file ValueLattice.h.

◆ ValueLatticeElement() [2/3]

llvm::ValueLatticeElement::ValueLatticeElement ( const ValueLatticeElement & Other )

inline

Definition at line 152 of file ValueLattice.h.

References ConstVal, llvm::Other, and Range.

◆ ValueLatticeElement() [3/3]

llvm::ValueLatticeElement::ValueLatticeElement ( ValueLatticeElement && Other )

inline

Definition at line 171 of file ValueLattice.h.

References ConstVal, llvm::Other, and Range.

Member Function Documentation

◆ asConstantInteger()

std::optional< APInt > llvm::ValueLatticeElement::asConstantInteger ( ) const

inline

Definition at line 275 of file ValueLattice.h.

References getConstant(), getConstantRange(), llvm::ConstantRange::getSingleElement(), isConstant(), and isConstantRange().

◆ asConstantRange() [1/2]

ConstantRange llvm::ValueLatticeElement::asConstantRange	(	Type *	Ty,
		bool	UndefAllowed = `false`
	)		const

inline

Definition at line 294 of file ValueLattice.h.

References asConstantRange(), assert(), llvm::Type::getScalarSizeInBits(), and llvm::Type::isIntOrIntVectorTy().

◆ asConstantRange() [2/2]

ConstantRange llvm::ValueLatticeElement::asConstantRange	(	unsigned	BW,
		bool	UndefAllowed = `false`
	)		const

inline

Definition at line 284 of file ValueLattice.h.

References getConstant(), getConstantRange(), isConstant(), isConstantRange(), isUnknown(), and llvm::Constant::toConstantRange().

Referenced by asConstantRange(), and llvm::refineInstruction().

◆ get()

static ValueLatticeElement llvm::ValueLatticeElement::get ( Constant * C )

inlinestatic

Definition at line 203 of file ValueLattice.h.

References llvm::CallingConv::C, and markConstant().

Referenced by llvm::LazyValueInfoImpl::getValueAt().

◆ getCompare()

Constant * llvm::ValueLatticeElement::getCompare	(	CmpInst::Predicate	Pred,
		Type *	Ty,
		const ValueLatticeElement &	Other,
		const DataLayout &	DL
	)		const

true, false or undef constants, or nullptr if the comparison cannot be evaluated.

Definition at line 14 of file ValueLattice.cpp.

References llvm::ConstantFoldCompareInstOperands(), DL, getConstant(), getConstantRange(), llvm::ConstantInt::getFalse(), llvm::CmpInst::getInversePredicate(), getNotConstant(), llvm::ConstantInt::getTrue(), llvm::CmpInst::ICMP_NE, isConstant(), isConstantRange(), llvm::ICmpInst::isEquality(), isNotConstant(), isUndef(), isUnknown(), and llvm::Other.

◆ getConstant()

Constant * llvm::ValueLatticeElement::getConstant ( ) const

inline

Definition at line 255 of file ValueLattice.h.

References assert(), ConstVal, and isConstant().

Referenced by asConstantInteger(), asConstantRange(), getCompare(), llvm::SCCPInstVisitor::getConstant(), getPredicateResult(), markConstant(), markConstantRange(), mergeIn(), and llvm::operator<<().

◆ getConstantRange()

const ConstantRange & llvm::ValueLatticeElement::getConstantRange ( bool UndefAllowed = true ) const

inline

Returns the constant range for this value.

Use UndefAllowed to exclude non-singleton constant ranges that may also be undef. Note that this function also returns a range if the range may include undef, but only contains a single element. In that case, it can be replaced by a constant.

Definition at line 269 of file ValueLattice.h.

References assert(), isConstantRange(), and Range.

Referenced by asConstantInteger(), asConstantRange(), getCompare(), llvm::SCCPInstVisitor::getConstant(), getPredicateResult(), hasSingleValue(), llvm::SCCPSolver::isConstant(), markConstantRange(), mergeIn(), llvm::operator<<(), and runIPSCCP().

◆ getNot()

static ValueLatticeElement llvm::ValueLatticeElement::getNot ( Constant * C )

inlinestatic

Definition at line 208 of file ValueLattice.h.

References assert(), llvm::CallingConv::C, and markNotConstant().

Referenced by getValueFromMetadata().

◆ getNotConstant()

Constant * llvm::ValueLatticeElement::getNotConstant ( ) const

inline

Definition at line 260 of file ValueLattice.h.

References assert(), ConstVal, and isNotConstant().

Referenced by getCompare(), getPredicateResult(), markNotConstant(), mergeIn(), and llvm::operator<<().

◆ getNumRangeExtensions()

unsigned llvm::ValueLatticeElement::getNumRangeExtensions ( ) const

inline

Definition at line 477 of file ValueLattice.h.

◆ getOverdefined()

static ValueLatticeElement llvm::ValueLatticeElement::getOverdefined ( )

inlinestatic

Definition at line 231 of file ValueLattice.h.

References markOverdefined().

Referenced by constantFoldUser(), getFromRangeMetadata(), getRange(), llvm::LazyValueInfoImpl::getValueAt(), getValueFromMetadata(), and getValueFromOverflowCondition().

◆ getRange()

static ValueLatticeElement llvm::ValueLatticeElement::getRange	(	ConstantRange	CR,
		bool	MayIncludeUndef = `false`
	)

inlinestatic

Definition at line 214 of file ValueLattice.h.

References getOverdefined(), llvm::ConstantRange::isEmptySet(), llvm::ConstantRange::isFullSet(), markConstantRange(), and markUndef().

Referenced by constantFoldUser(), getFromRangeMetadata(), getValueFromMetadata(), getValueFromOverflowCondition(), and intersect().

◆ isConstant()

bool llvm::ValueLatticeElement::isConstant ( ) const

inline

Definition at line 240 of file ValueLattice.h.

Referenced by asConstantInteger(), asConstantRange(), getCompare(), getConstant(), llvm::SCCPInstVisitor::getConstant(), getPredicateResult(), hasSingleValue(), llvm::SCCPSolver::isConstant(), markConstant(), markConstantRange(), and mergeIn().

◆ isConstantRange()

bool llvm::ValueLatticeElement::isConstantRange ( bool UndefAllowed = true ) const

inline

Returns true if this value is a constant range.

Use UndefAllowed to exclude non-singleton constant ranges that may also be undef. Note that this function also returns true if the range may include undef, but only contains a single element. In that case, it can be replaced by a constant.

Definition at line 249 of file ValueLattice.h.

References llvm::ConstantRange::isSingleElement(), and Range.

Referenced by asConstantInteger(), asConstantRange(), getCompare(), llvm::SCCPInstVisitor::getConstant(), getConstantRange(), getPredicateResult(), hasSingleValue(), llvm::SCCPSolver::isConstant(), markConstantRange(), mergeIn(), llvm::operator<<(), and runIPSCCP().

◆ isConstantRangeIncludingUndef()

bool llvm::ValueLatticeElement::isConstantRangeIncludingUndef ( ) const

inline

Definition at line 242 of file ValueLattice.h.

Referenced by markConstantRange(), llvm::operator<<(), and runIPSCCP().

◆ isNotConstant()

bool llvm::ValueLatticeElement::isNotConstant ( ) const

inline

Definition at line 241 of file ValueLattice.h.

Referenced by getCompare(), getNotConstant(), getPredicateResult(), markNotConstant(), mergeIn(), and llvm::operator<<().

◆ isOverdefined()

bool llvm::ValueLatticeElement::isOverdefined ( ) const

inline

Definition at line 253 of file ValueLattice.h.

Referenced by markOverdefined(), mergeIn(), and llvm::operator<<().

◆ isUndef()

bool llvm::ValueLatticeElement::isUndef ( ) const

inline

Definition at line 237 of file ValueLattice.h.

Referenced by getCompare(), markConstant(), markConstantRange(), markUndef(), mergeIn(), and llvm::operator<<().

◆ isUnknown()

bool llvm::ValueLatticeElement::isUnknown ( ) const

inline

Definition at line 238 of file ValueLattice.h.

Referenced by asConstantRange(), getCompare(), markConstant(), markConstantRange(), markNotConstant(), markUndef(), mergeIn(), llvm::operator<<(), and llvm::SCCPInstVisitor::resolvedUndef().

◆ isUnknownOrUndef()

bool llvm::ValueLatticeElement::isUnknownOrUndef ( ) const

inline

Definition at line 239 of file ValueLattice.h.

Referenced by llvm::SCCPSolver::isOverdefined(), and runIPSCCP().

◆ markConstant()

bool llvm::ValueLatticeElement::markConstant	(	Constant *	V,
		bool	MayIncludeUndef = `false`
	)

inline

Definition at line 316 of file ValueLattice.h.

References assert(), ConstVal, getConstant(), isConstant(), isUndef(), isUnknown(), markConstantRange(), and markUndef().

Referenced by get(), mergeIn(), and llvm::SCCPInstVisitor::setLatticeValueForSpecializationArguments().

◆ markConstantRange()

bool llvm::ValueLatticeElement::markConstantRange	(	ConstantRange	NewR,
		MergeOptions	Opts = `MergeOptions()`
	)

inline

Mark the object as constant range with NewR.

If the object is already a constant range, nothing changes if the existing range is equal to NewR and the tag. Otherwise NewR must be a superset of the existing range or the object must be undef. The tag is set to constant_range_including_undef if either the existing value or the new range may include undef.

Definition at line 362 of file ValueLattice.h.

References assert(), llvm::ConstantRange::contains(), getConstant(), getConstantRange(), isConstant(), isConstantRange(), isConstantRangeIncludingUndef(), llvm::ConstantRange::isEmptySet(), llvm::ConstantRange::isFullSet(), isUndef(), isUnknown(), markOverdefined(), and Range.

Referenced by getRange(), markConstant(), markNotConstant(), and mergeIn().

◆ markNotConstant()

bool llvm::ValueLatticeElement::markNotConstant ( Constant * V )

inline

Definition at line 336 of file ValueLattice.h.

References assert(), ConstVal, getNotConstant(), isNotConstant(), isUnknown(), and markConstantRange().

Referenced by getNot().

◆ markOverdefined()

bool llvm::ValueLatticeElement::markOverdefined ( )

inline

Definition at line 299 of file ValueLattice.h.

References isOverdefined().

Referenced by getOverdefined(), markConstantRange(), and mergeIn().

◆ markUndef()

bool llvm::ValueLatticeElement::markUndef ( )

inline

Definition at line 307 of file ValueLattice.h.

References assert(), isUndef(), and isUnknown().

Referenced by getRange(), and markConstant().

◆ mergeIn()

bool llvm::ValueLatticeElement::mergeIn	(	const ValueLatticeElement &	RHS,
		MergeOptions	Opts = `MergeOptions()`
	)

inline

Updates this object to approximate both this object and RHS.

Returns true if this object has been changed.

Definition at line 402 of file ValueLattice.h.

References assert(), getConstant(), getConstantRange(), getNotConstant(), getType(), isConstant(), isConstantRange(), isNotConstant(), isOverdefined(), isUndef(), isUnknown(), markConstant(), markConstantRange(), markOverdefined(), RHS, and llvm::Constant::toConstantRange().

◆ operator=() [1/2]

ValueLatticeElement & llvm::ValueLatticeElement::operator= ( const ValueLatticeElement & Other )

inline

Definition at line 191 of file ValueLattice.h.

References llvm::Other, and ValueLatticeElement().

◆ operator=() [2/2]

ValueLatticeElement & llvm::ValueLatticeElement::operator= ( ValueLatticeElement && Other )

inline

Definition at line 197 of file ValueLattice.h.

References llvm::Other, and ValueLatticeElement().

◆ setNumRangeExtensions()

void llvm::ValueLatticeElement::setNumRangeExtensions ( unsigned N )

inline

Definition at line 478 of file ValueLattice.h.

References N.

Member Data Documentation

◆ ConstVal

Constant* llvm::ValueLatticeElement::ConstVal

Definition at line 89 of file ValueLattice.h.

Referenced by getConstant(), getNotConstant(), markConstant(), markNotConstant(), and ValueLatticeElement().

◆ Range

ConstantRange llvm::ValueLatticeElement::Range

Definition at line 90 of file ValueLattice.h.

Referenced by getConstantRange(), isConstantRange(), markConstantRange(), and ValueLatticeElement().

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

include/llvm/Analysis/ValueLattice.h
lib/Analysis/ValueLattice.cpp

Classes

Public Member Functions

Static Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ ValueLatticeElement() [1/3]

◆ ~ValueLatticeElement()

◆ ValueLatticeElement() [2/3]

◆ ValueLatticeElement() [3/3]

Member Function Documentation

◆ asConstantInteger()

◆ asConstantRange() [1/2]

◆ asConstantRange() [2/2]

◆ get()

◆ getCompare()

◆ getConstant()

◆ getConstantRange()

◆ getNot()

◆ getNotConstant()

◆ getNumRangeExtensions()

◆ getOverdefined()

◆ getRange()

◆ isConstant()

◆ isConstantRange()

◆ isConstantRangeIncludingUndef()

◆ isNotConstant()

◆ isOverdefined()

◆ isUndef()

◆ isUnknown()

◆ isUnknownOrUndef()

◆ markConstant()

◆ markConstantRange()

◆ markNotConstant()

◆ markOverdefined()

◆ markUndef()

◆ mergeIn()

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ setNumRangeExtensions()

Member Data Documentation

◆ ConstVal

◆ Range