llvm::ScalarEvolution::ExitLimit Struct Reference

Information about the number of loop iterations for which a loop exit's branch condition evaluates to the not-taken path. More...

#include "llvm/Analysis/ScalarEvolution.h"

Public Member Functions
LLVM_ABI	ExitLimit (const SCEV *E)
	Construct either an exact exit limit from a constant, or an unknown one from a SCEVCouldNotCompute.
LLVM_ABI	ExitLimit (const SCEV *E, const SCEV *ConstantMaxNotTaken, const SCEV *SymbolicMaxNotTaken, bool MaxOrZero, ArrayRef< ArrayRef< const SCEVPredicate * > > PredLists={})
LLVM_ABI	ExitLimit (const SCEV *E, const SCEV *ConstantMaxNotTaken, const SCEV *SymbolicMaxNotTaken, bool MaxOrZero, ArrayRef< const SCEVPredicate * > PredList)
bool	hasAnyInfo () const
	Test whether this ExitLimit contains any computed information, or whether it's all SCEVCouldNotCompute values.
bool	hasFullInfo () const
	Test whether this ExitLimit contains all information.

Public Attributes
const SCEV *	ExactNotTaken
const SCEV *	ConstantMaxNotTaken
const SCEV *	SymbolicMaxNotTaken
bool	MaxOrZero = false
SmallVector< const SCEVPredicate *, 4 >	Predicates
	A vector of predicate guards for this ExitLimit.

Detailed Description

Information about the number of loop iterations for which a loop exit's branch condition evaluates to the not-taken path.

This is a temporary pair of exact and max expressions that are eventually summarized in ExitNotTakenInfo and BackedgeTakenInfo.

Definition at line 1147 of file ScalarEvolution.h.

Constructor & Destructor Documentation

ExitLimit() [1/3]

ScalarEvolution::ExitLimit::ExitLimit

(

const SCEV *

E

)

Construct either an exact exit limit from a constant, or an unknown one from a SCEVCouldNotCompute.

No other types of SCEVs are allowed as arguments and asserts enforce that internally.

Definition at line 8783 of file ScalarEvolution.cpp.

References ExitLimit().

Referenced by ExitLimit(), and ExitLimit().

ExitLimit() [2/3]

ScalarEvolution::ExitLimit::ExitLimit	(	const SCEV *	E,
		const SCEV *	ConstantMaxNotTaken,
		const SCEV *	SymbolicMaxNotTaken,
		bool	MaxOrZero,
		ArrayRef< ArrayRef< const SCEVPredicate * > >	PredLists = {} )

Definition at line 8786 of file ScalarEvolution.cpp.

References assert(), ConstantMaxNotTaken, llvm::SmallPtrSetImpl< PtrType >::contains(), ExactNotTaken, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::isa(), MaxOrZero, P, Predicates, and SymbolicMaxNotTaken.

ExitLimit() [3/3]

ScalarEvolution::ExitLimit::ExitLimit	(	const SCEV *	E,
		const SCEV *	ConstantMaxNotTaken,
		const SCEV *	SymbolicMaxNotTaken,
		bool	MaxOrZero,
		ArrayRef< const SCEVPredicate * >	PredList )

Definition at line 8828 of file ScalarEvolution.cpp.

References ConstantMaxNotTaken, ExitLimit(), MaxOrZero, and SymbolicMaxNotTaken.

Member Function Documentation

hasAnyInfo()

bool llvm::ScalarEvolution::ExitLimit::hasAnyInfo ( ) const

inline

Test whether this ExitLimit contains any computed information, or whether it's all SCEVCouldNotCompute values.

Definition at line 1177 of file ScalarEvolution.h.

References ConstantMaxNotTaken, ExactNotTaken, and llvm::isa().

hasFullInfo()

bool llvm::ScalarEvolution::ExitLimit::hasFullInfo ( ) const

inline

Test whether this ExitLimit contains all information.

Definition at line 1183 of file ScalarEvolution.h.

References ExactNotTaken, and llvm::isa().

Member Data Documentation

ConstantMaxNotTaken

const SCEV* llvm::ScalarEvolution::ExitLimit::ConstantMaxNotTaken

Definition at line 1149 of file ScalarEvolution.h.

Referenced by ExitLimit(), ExitLimit(), and hasAnyInfo().

ExactNotTaken

const SCEV* llvm::ScalarEvolution::ExitLimit::ExactNotTaken

Definition at line 1148 of file ScalarEvolution.h.

Referenced by ExitLimit(), hasAnyInfo(), and hasFullInfo().

MaxOrZero

bool llvm::ScalarEvolution::ExitLimit::MaxOrZero = false

Definition at line 1154 of file ScalarEvolution.h.

Referenced by ExitLimit(), and ExitLimit().

Predicates

SmallVector<const SCEVPredicate *, 4> llvm::ScalarEvolution::ExitLimit::Predicates

A vector of predicate guards for this ExitLimit.

The result is only valid if all of the predicates in Predicates evaluate to 'true' at run-time.

Definition at line 1159 of file ScalarEvolution.h.

Referenced by ExitLimit().

SymbolicMaxNotTaken

const SCEV* llvm::ScalarEvolution::ExitLimit::SymbolicMaxNotTaken

Definition at line 1151 of file ScalarEvolution.h.

Referenced by ExitLimit(), and ExitLimit().

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

• include/llvm/Analysis/ScalarEvolution.h
• lib/Analysis/ScalarEvolution.cpp