llvm::InstructionCost Class Reference

#include "llvm/Support/InstructionCost.h"

Public Types
enum	CostState { Valid, Invalid }
	CostState describes the state of a cost. More...
using	CostType = int64_t

Public Member Functions
	InstructionCost ()=default
	InstructionCost (CostState)=delete
	InstructionCost (CostType Val)
bool	isValid () const
void	setValid ()
void	setInvalid ()
CostState	getState () const
Optional< CostType >	getValue () const
	This function is intended to be used as sparingly as possible, since the class provides the full range of operator support required for arithmetic and comparisons. More...
InstructionCost &	operator+= (const InstructionCost &RHS)
	For all of the arithmetic operators provided here any invalid state is perpetuated and cannot be removed. More...
InstructionCost &	operator+= (const CostType RHS)
InstructionCost &	operator-= (const InstructionCost &RHS)
InstructionCost &	operator-= (const CostType RHS)
InstructionCost &	operator*= (const InstructionCost &RHS)
InstructionCost &	operator*= (const CostType RHS)
InstructionCost &	operator/= (const InstructionCost &RHS)
InstructionCost &	operator/= (const CostType RHS)
InstructionCost &	operator++ ()
InstructionCost	operator++ (int)
InstructionCost &	operator-- ()
InstructionCost	operator-- (int)
bool	operator< (const InstructionCost &RHS) const
	For the comparison operators we have chosen to use lexicographical ordering where valid costs are always considered to be less than invalid costs. More...
bool	operator== (const InstructionCost &RHS) const
bool	operator!= (const InstructionCost &RHS) const
bool	operator== (const CostType RHS) const
bool	operator!= (const CostType RHS) const
bool	operator> (const InstructionCost &RHS) const
bool	operator<= (const InstructionCost &RHS) const
bool	operator>= (const InstructionCost &RHS) const
bool	operator< (const CostType RHS) const
bool	operator> (const CostType RHS) const
bool	operator<= (const CostType RHS) const
bool	operator>= (const CostType RHS) const
void	print (raw_ostream &OS) const
template<class Function >
auto	map (const Function &F) const -> InstructionCost

Static Public Member Functions
static InstructionCost	getMax ()
static InstructionCost	getMin ()
static InstructionCost	getInvalid (CostType Val=0)

Detailed Description

Definition at line 29 of file InstructionCost.h.

Member Typedef Documentation

CostType

using llvm::InstructionCost::CostType = int64_t

Definition at line 31 of file InstructionCost.h.

Member Enumeration Documentation

CostState

enum llvm::InstructionCost::CostState

CostState describes the state of a cost.

Enumerator
Valid
Invalid	< The cost value represents a valid cost, even when the cost-value is large. < Invalid indicates there is no way to represent the cost as a numeric value. This state exists to represent a possible issue, e.g. if the cost-model knows the operation cannot be expanded into a valid code-sequence by the code-generator. While some passes may assert that the calculated cost must be valid, it is up to individual passes how to interpret an Invalid cost. For example, a transformation pass could choose not to perform a transformation if the resulting cost would end up Invalid. Because some passes may assert a cost is Valid, it is not recommended to use Invalid costs to model 'Unknown'. Note that Invalid is semantically different from a (very) high, but valid cost, which intentionally indicates no issue, but rather a strong preference not to select a certain operation.

Definition at line 34 of file InstructionCost.h.

Constructor & Destructor Documentation

InstructionCost() [1/3]

llvm::InstructionCost::InstructionCost ( )

default

InstructionCost() [2/3]

llvm::InstructionCost::InstructionCost ( CostState  )

delete

InstructionCost() [3/3]

llvm::InstructionCost::InstructionCost ( CostType  Val )

inline

Definition at line 69 of file InstructionCost.h.

Member Function Documentation

getInvalid()

static InstructionCost llvm::InstructionCost::getInvalid ( CostType  Val = 0 )

inlinestatic

Definition at line 73 of file InstructionCost.h.

References setInvalid().

Referenced by llvm::ComputeSpeculationCost(), llvm::AArch64TTIImpl::getArithmeticReductionCost(), llvm::AArch64TTIImpl::getArithmeticReductionCostSVE(), llvm::BasicTTIImplBase< AMDGPUTTIImpl >::getCastInstrCost(), llvm::BasicTTIImplBase< AMDGPUTTIImpl >::getCmpSelInstrCost(), llvm::LoopVectorizationCostModel::getDivRemSpeculationCost(), llvm::AArch64TTIImpl::getGatherScatterOpCost(), llvm::BasicTTIImplBase< AMDGPUTTIImpl >::getInterleavedMemoryOpCost(), llvm::BasicTTIImplBase< AMDGPUTTIImpl >::getIntrinsicInstrCost(), llvm::AArch64TTIImpl::getMaskedMemoryOpCost(), llvm::AArch64TTIImpl::getMemoryOpCost(), llvm::BasicTTIImplBase< AMDGPUTTIImpl >::getMinMaxReductionCost(), llvm::BasicTTIImplBase< AMDGPUTTIImpl >::getOrderedReductionCost(), llvm::BasicTTIImplBase< AMDGPUTTIImpl >::getScalarizationOverhead(), llvm::BasicTTIImplBase< AMDGPUTTIImpl >::getShuffleCost(), llvm::AArch64TTIImpl::getSpliceCost(), llvm::BasicTTIImplBase< AMDGPUTTIImpl >::getTreeReductionCost(), llvm::BasicTTIImplBase< AMDGPUTTIImpl >::getTypeBasedIntrinsicInstrCost(), llvm::BasicTTIImplBase< AMDGPUTTIImpl >::getTypeLegalizationCost(), map(), llvm::CostModelPrinterPass::run(), llvm::LoopVectorizationCostModel::setCostBasedWideningDecision(), and llvm::PPCTTIImpl::vectorCostAdjustmentFactor().

getMax()

static InstructionCost llvm::InstructionCost::getMax ( )

inlinestatic

Definition at line 71 of file InstructionCost.h.

Referenced by llvm::PPCTTIImpl::getArithmeticInstrCost(), llvm::HexagonTTIImpl::getArithmeticInstrCost(), llvm::PPCTTIImpl::getCastInstrCost(), llvm::HexagonTTIImpl::getCastInstrCost(), llvm::PPCTTIImpl::getCmpSelInstrCost(), llvm::HexagonTTIImpl::getCmpSelInstrCost(), llvm::PPCTTIImpl::getInterleavedMemoryOpCost(), llvm::PPCTTIImpl::getMemoryOpCost(), llvm::PPCTTIImpl::getShuffleCost(), llvm::PPCTTIImpl::getVectorInstrCost(), llvm::PPCTTIImpl::getVPMemoryOpCost(), and llvm::LoopVectorizationCostModel::selectVectorizationFactor().

getMin()

static InstructionCost llvm::InstructionCost::getMin ( )

inlinestatic

Definition at line 72 of file InstructionCost.h.

getState()

CostState llvm::InstructionCost::getState ( ) const

inline

Definition at line 82 of file InstructionCost.h.

getValue()

Optional<CostType> llvm::InstructionCost::getValue ( ) const

inline

This function is intended to be used as sparingly as possible, since the class provides the full range of operator support required for arithmetic and comparisons.

Definition at line 87 of file InstructionCost.h.

References isValid(), and llvm::None.

Referenced by analyzeLoopUnrollCost(), areRuntimeChecksProfitable(), computeHeuristicUnrollFactor(), llvm::SystemZTTIImpl::getUnrollingPreferences(), llvm::LoopVectorizationCostModel::selectInterleaveCount(), tryToUnrollAndJamLoop(), and tryToUnrollLoop().

isValid()

bool llvm::InstructionCost::isValid ( ) const

inline

Definition at line 79 of file InstructionCost.h.

References Valid.

Referenced by analyzeLoopUnrollCost(), llvm::ApproximateLoopSize(), areRuntimeChecksProfitable(), computeHeuristicUnrollFactor(), llvm::PPCTTIImpl::getArithmeticInstrCost(), llvm::PPCTTIImpl::getCastInstrCost(), llvm::PPCTTIImpl::getCmpSelInstrCost(), llvm::PPCTTIImpl::getInterleavedMemoryOpCost(), llvm::PPCTTIImpl::getMemoryOpCost(), getScalingFactorCost(), llvm::PPCTTIImpl::getShuffleCost(), getValue(), llvm::PPCTTIImpl::getVectorInstrCost(), llvm::PPCTTIImpl::getVPMemoryOpCost(), map(), print(), llvm::LoopVectorizationCostModel::selectInterleaveCount(), llvm::LoopVectorizationCostModel::selectVectorizationFactor(), llvm::IntrinsicCostAttributes::skipScalarizationCost(), tryToUnrollAndJamLoop(), and tryToUnrollLoop().

map()

template<class Function >

auto llvm::InstructionCost::map ( const Function &  F ) const -> InstructionCost

inline

Definition at line 245 of file InstructionCost.h.

References F, getInvalid(), and isValid().

operator!=() [1/2]

bool llvm::InstructionCost::operator!= ( const CostType  RHS ) const

inline

Definition at line 214 of file InstructionCost.h.

References RHS.

operator!=() [2/2]

bool llvm::InstructionCost::operator!= ( const InstructionCost &  RHS ) const

inline

Definition at line 207 of file InstructionCost.h.

References RHS.

operator*=() [1/2]

InstructionCost& llvm::InstructionCost::operator*= ( const CostType  RHS )

inline

Definition at line 150 of file InstructionCost.h.

References RHS.

operator*=() [2/2]

InstructionCost& llvm::InstructionCost::operator*= ( const InstructionCost &  RHS )

inline

Definition at line 134 of file InstructionCost.h.

References llvm::MulOverflow(), and RHS.

operator++() [1/2]

InstructionCost& llvm::InstructionCost::operator++ ( )

inline

Definition at line 168 of file InstructionCost.h.

operator++() [2/2]

InstructionCost llvm::InstructionCost::operator++ ( int  )

inline

Definition at line 173 of file InstructionCost.h.

operator+=() [1/2]

InstructionCost& llvm::InstructionCost::operator+= ( const CostType  RHS )

inline

Definition at line 111 of file InstructionCost.h.

References RHS.

operator+=() [2/2]

InstructionCost& llvm::InstructionCost::operator+= ( const InstructionCost &  RHS )

inline

For all of the arithmetic operators provided here any invalid state is perpetuated and cannot be removed.

Once a cost becomes invalid it stays invalid, and it also inherits any invalid state from the RHS. Arithmetic work on the actual values is implemented with saturation, to avoid overflow when using more extreme cost values.

Definition at line 99 of file InstructionCost.h.

References llvm::AddOverflow(), and RHS.

operator--() [1/2]

InstructionCost& llvm::InstructionCost::operator-- ( )

inline

Definition at line 179 of file InstructionCost.h.

operator--() [2/2]

InstructionCost llvm::InstructionCost::operator-- ( int  )

inline

Definition at line 184 of file InstructionCost.h.

operator-=() [1/2]

InstructionCost& llvm::InstructionCost::operator-= ( const CostType  RHS )

inline

Definition at line 128 of file InstructionCost.h.

References RHS.

operator-=() [2/2]

InstructionCost& llvm::InstructionCost::operator-= ( const InstructionCost &  RHS )

inline

Definition at line 117 of file InstructionCost.h.

References RHS, and llvm::SubOverflow().

operator/=() [1/2]

InstructionCost& llvm::InstructionCost::operator/= ( const CostType  RHS )

inline

Definition at line 162 of file InstructionCost.h.

References RHS.

operator/=() [2/2]

InstructionCost& llvm::InstructionCost::operator/= ( const InstructionCost &  RHS )

inline

Definition at line 156 of file InstructionCost.h.

References RHS.

operator<() [1/2]

bool llvm::InstructionCost::operator< ( const CostType  RHS ) const

inline

Definition at line 222 of file InstructionCost.h.

References RHS.

operator<() [2/2]

bool llvm::InstructionCost::operator< ( const InstructionCost &  RHS ) const

inline

For the comparison operators we have chosen to use lexicographical ordering where valid costs are always considered to be less than invalid costs.

This avoids having to add asserts to the comparison operators that the states are valid and users can test for validity of the cost explicitly.

Definition at line 195 of file InstructionCost.h.

References RHS.

operator<=() [1/2]

bool llvm::InstructionCost::operator<= ( const CostType  RHS ) const

inline

Definition at line 232 of file InstructionCost.h.

References RHS.

operator<=() [2/2]

bool llvm::InstructionCost::operator<= ( const InstructionCost &  RHS ) const

inline

Definition at line 218 of file InstructionCost.h.

References RHS.

operator==() [1/2]

bool llvm::InstructionCost::operator== ( const CostType  RHS ) const

inline

Definition at line 209 of file InstructionCost.h.

References RHS.

operator==() [2/2]

bool llvm::InstructionCost::operator== ( const InstructionCost &  RHS ) const

inline

Definition at line 203 of file InstructionCost.h.

References RHS.

operator>() [1/2]

bool llvm::InstructionCost::operator> ( const CostType  RHS ) const

inline

Definition at line 227 of file InstructionCost.h.

References RHS.

operator>() [2/2]

bool llvm::InstructionCost::operator> ( const InstructionCost &  RHS ) const

inline

Definition at line 216 of file InstructionCost.h.

References RHS.

operator>=() [1/2]

bool llvm::InstructionCost::operator>= ( const CostType  RHS ) const

inline

Definition at line 237 of file InstructionCost.h.

References RHS.

operator>=() [2/2]

bool llvm::InstructionCost::operator>= ( const InstructionCost &  RHS ) const

inline

Definition at line 220 of file InstructionCost.h.

References RHS.

print()

void InstructionCost::print

(

raw_ostream &

OS

)

const

Definition at line 19 of file InstructionCost.cpp.

References isValid().

Referenced by llvm::operator<<().

setInvalid()

void llvm::InstructionCost::setInvalid ( )

inline

Definition at line 81 of file InstructionCost.h.

References Invalid.

Referenced by getInvalid().

setValid()

void llvm::InstructionCost::setValid ( )

inline

Definition at line 80 of file InstructionCost.h.

References Valid.

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

• include/llvm/Support/InstructionCost.h
• lib/Support/InstructionCost.cpp