llvm::UnrollCostEstimator Class Reference

Produce an estimate of the unrolled cost of the specified loop. More...

#include "llvm/Transforms/Utils/UnrollLoop.h"

Public Member Functions
	UnrollCostEstimator (const Loop *L, const TargetTransformInfo &TTI, const SmallPtrSetImpl< const Value * > &EphValues, unsigned BEInsns)
bool	canUnroll () const
	Whether it is legal to unroll this loop.
uint64_t	getRolledLoopSize () const
uint64_t	getUnrolledLoopSize (const TargetTransformInfo::UnrollingPreferences &UP, unsigned CountOverwrite=0) const
	Returns loop size estimation for unrolled loop, given the unrolling configuration specified by UP.

Public Attributes
unsigned	NumInlineCandidates
ConvergenceKind	Convergence
bool	ConvergenceAllowsRuntime

Detailed Description

Produce an estimate of the unrolled cost of the specified loop.

This is used to a) produce a cost estimate for partial unrolling and b) to cheaply estimate cost for full unrolling when we don't want to symbolically evaluate all iterations.

Definition at line 127 of file UnrollLoop.h.

Constructor & Destructor Documentation

UnrollCostEstimator()

UnrollCostEstimator::UnrollCostEstimator	(	const Loop *	L,
		const TargetTransformInfo &	TTI,
		const SmallPtrSetImpl< const Value * > &	EphValues,
		unsigned	BEInsns
	)

Definition at line 682 of file LoopUnrollPass.cpp.

References Convergence, ConvergenceAllowsRuntime, llvm::getLoopConvergenceHeart(), llvm::InstructionCost::isValid(), Metrics, NumInlineCandidates, and llvm::Uncontrolled.

Member Function Documentation

canUnroll()

bool UnrollCostEstimator::canUnroll

(

)

const

Whether it is legal to unroll this loop.

Definition at line 708 of file LoopUnrollPass.cpp.

References Convergence, llvm::dbgs(), llvm::ExtendedLoop, llvm::InstructionCost::isValid(), and LLVM_DEBUG.

Referenced by computeHeuristicUnrollFactor(), tryToUnrollAndJamLoop(), and tryToUnrollLoop().

getRolledLoopSize()

uint64_t llvm::UnrollCostEstimator::getRolledLoopSize ( ) const

inline

Definition at line 143 of file UnrollLoop.h.

References llvm::InstructionCost::getValue().

Referenced by computeHeuristicUnrollFactor(), computeUnrollAndJamCount(), llvm::computeUnrollCount(), tryToUnrollAndJamLoop(), and tryToUnrollLoop().

getUnrolledLoopSize()

uint64_t UnrollCostEstimator::getUnrolledLoopSize	(	const TargetTransformInfo::UnrollingPreferences &	UP,
		unsigned	CountOverwrite = 0
	)		const

Returns loop size estimation for unrolled loop, given the unrolling configuration specified by UP.

Definition at line 727 of file LoopUnrollPass.cpp.

References assert(), llvm::TargetTransformInfo::UnrollingPreferences::BEInsns, llvm::TargetTransformInfo::UnrollingPreferences::Count, and llvm::InstructionCost::getValue().

Referenced by llvm::computeUnrollCount(), shouldFullUnroll(), shouldPartialUnroll(), and shouldPragmaUnroll().

Member Data Documentation

Convergence

ConvergenceKind llvm::UnrollCostEstimator::Convergence

Definition at line 133 of file UnrollLoop.h.

Referenced by canUnroll(), tryToUnrollAndJamLoop(), and UnrollCostEstimator().

ConvergenceAllowsRuntime

bool llvm::UnrollCostEstimator::ConvergenceAllowsRuntime

Definition at line 134 of file UnrollLoop.h.

Referenced by tryToUnrollLoop(), and UnrollCostEstimator().

NumInlineCandidates

unsigned llvm::UnrollCostEstimator::NumInlineCandidates

Definition at line 132 of file UnrollLoop.h.

Referenced by tryToUnrollAndJamLoop(), tryToUnrollLoop(), and UnrollCostEstimator().

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

• include/llvm/Transforms/Utils/UnrollLoop.h
• lib/Transforms/Scalar/LoopUnrollPass.cpp