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.

LLVM_ABI 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.

LLVM_ABI ValueLatticeElement	intersect (const ValueLatticeElement &Other) const
	Combine two sets of facts about the same value into a single set of facts.

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 27 of file ValueLattice.h.

Constructor & Destructor Documentation

◆ ValueLatticeElement() [1/3]

llvm::ValueLatticeElement::ValueLatticeElement ( )

inline

Definition at line 146 of file ValueLattice.h.

Referenced by operator=().

◆ ~ValueLatticeElement()

llvm::ValueLatticeElement::~ValueLatticeElement ( )

inline

Definition at line 148 of file ValueLattice.h.

◆ ValueLatticeElement() [2/3]

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

inline

Definition at line 150 of file ValueLattice.h.

References ConstVal, llvm::Other, and Range.

◆ ValueLatticeElement() [3/3]

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

inline

Definition at line 169 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 273 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 292 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 282 of file ValueLattice.h.

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

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

◆ get()

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

inlinestatic

Definition at line 201 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 15 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 253 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 267 of file ValueLattice.h.

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

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

◆ getNot()

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

inlinestatic

Definition at line 206 of file ValueLattice.h.

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

Referenced by llvm::SCCPInstVisitor::getArgAttributeVL(), and getValueFromMetadata().

◆ getNotConstant()

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

inline

Definition at line 258 of file ValueLattice.h.

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

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

◆ getNumRangeExtensions()

unsigned llvm::ValueLatticeElement::getNumRangeExtensions ( ) const

inline

Definition at line 493 of file ValueLattice.h.

◆ getOverdefined()

static ValueLatticeElement llvm::ValueLatticeElement::getOverdefined ( )

inlinestatic

Definition at line 229 of file ValueLattice.h.

References markOverdefined().

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

◆ getRange()

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

inlinestatic

Definition at line 212 of file ValueLattice.h.

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

Referenced by constantFoldUser(), llvm::SCCPInstVisitor::getArgAttributeVL(), getFromRangeMetadata(), getValueFromICmpCtpop(), getValueFromMetadata(), getValueFromOverflowCondition(), and intersect().

◆ intersect()

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

Combine two sets of facts about the same value into a single set of facts.

Note that this method is not suitable for merging facts along different paths in a CFG; that's what the mergeIn function is for. This is for merging facts gathered about the same value at the same location through two independent means. Notes:

This method does not promise to return the most precise possible lattice value implied by A and B. It is allowed to return any lattice element which is at least as strong as either A or B (unless our facts conflict, see below).
Due to unreachable code, the intersection of two lattice values could be contradictory. If this happens, we return some valid lattice value so as not confuse the rest of LVI. Ideally, we'd always return Undefined, but we do not make this guarantee. TODO: This would be a useful enhancement.

Definition at line 78 of file ValueLattice.cpp.

References getConstantRange(), getRange(), llvm::hasSingleValue(), llvm::ConstantRange::intersectWith(), isConstantRange(), isConstantRangeIncludingUndef(), isOverdefined(), isUnknown(), llvm::Other, and Range.

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

◆ isConstant()

bool llvm::ValueLatticeElement::isConstant ( ) const

inline

Definition at line 238 of file ValueLattice.h.

Referenced by asConstantInteger(), asConstantRange(), getCompare(), getConstant(), llvm::SCCPInstVisitor::getConstant(), getPredicateResult(), hasSingleValue(), llvm::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 247 of file ValueLattice.h.

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

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

◆ isConstantRangeIncludingUndef()

bool llvm::ValueLatticeElement::isConstantRangeIncludingUndef ( ) const

inline

Definition at line 240 of file ValueLattice.h.

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

◆ isNotConstant()

bool llvm::ValueLatticeElement::isNotConstant ( ) const

inline

Definition at line 239 of file ValueLattice.h.

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

◆ isOverdefined()

bool llvm::ValueLatticeElement::isOverdefined ( ) const

inline

Definition at line 251 of file ValueLattice.h.

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

◆ isUndef()

bool llvm::ValueLatticeElement::isUndef ( ) const

inline

Definition at line 235 of file ValueLattice.h.

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

◆ isUnknown()

bool llvm::ValueLatticeElement::isUnknown ( ) const

inline

Definition at line 236 of file ValueLattice.h.

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

◆ isUnknownOrUndef()

bool llvm::ValueLatticeElement::isUnknownOrUndef ( ) const

inline

Definition at line 237 of file ValueLattice.h.

Referenced by llvm::SCCPSolver::isOverdefined().

◆ markConstant()

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

inline

Definition at line 314 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 360 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 334 of file ValueLattice.h.

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

Referenced by getNot().

◆ markOverdefined()

bool llvm::ValueLatticeElement::markOverdefined ( )

inline

Definition at line 297 of file ValueLattice.h.

References isOverdefined().

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

◆ markUndef()

bool llvm::ValueLatticeElement::markUndef ( )

inline

Definition at line 305 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 400 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 189 of file ValueLattice.h.

References llvm::Other, and ValueLatticeElement().

◆ operator=() [2/2]

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

inline

Definition at line 195 of file ValueLattice.h.

References llvm::Other, and ValueLatticeElement().

◆ setNumRangeExtensions()

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

inline

Definition at line 494 of file ValueLattice.h.

References N.

Member Data Documentation

◆ ConstVal

Constant* llvm::ValueLatticeElement::ConstVal

Definition at line 87 of file ValueLattice.h.

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

◆ Range

ConstantRange llvm::ValueLatticeElement::Range

Definition at line 88 of file ValueLattice.h.

Referenced by getConstantRange(), intersect(), 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()

◆ intersect()

◆ 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