llvm::bfi_detail::BlockMass Class Reference

Mass of a block. More...

#include "llvm/Analysis/BlockFrequencyInfoImpl.h"

Public Member Functions
	BlockMass ()=default
	BlockMass (uint64_t Mass)
uint64_t	getMass () const
bool	isFull () const
bool	isEmpty () const
bool	operator! () const
BlockMass &	operator+= (BlockMass X)
	Add another mass.
BlockMass &	operator-= (BlockMass X)
	Subtract another mass.
BlockMass &	operator*= (BranchProbability P)
bool	operator== (BlockMass X) const
bool	operator!= (BlockMass X) const
bool	operator<= (BlockMass X) const
bool	operator>= (BlockMass X) const
bool	operator< (BlockMass X) const
bool	operator> (BlockMass X) const
ScaledNumber< uint64_t >	toScaled () const
	Convert to scaled number.
void	dump () const
raw_ostream &	print (raw_ostream &OS) const

Static Public Member Functions
static BlockMass	getEmpty ()
static BlockMass	getFull ()

Detailed Description

Mass of a block.

This class implements a sort of fixed-point fraction always between 0.0 and 1.0. getMass() == std::numeric_limits<uint64_t>::max() indicates a value of 1.0.

Masses can be added and subtracted. Simple saturation arithmetic is used, so arithmetic operations never overflow or underflow.

Masses can be multiplied. Multiplication treats full mass as 1.0 and uses an inexpensive floating-point algorithm that's off-by-one (almost, but not quite, maximum precision).

Masses can be scaled by BranchProbability at maximum precision.

Definition at line 92 of file BlockFrequencyInfoImpl.h.

Constructor & Destructor Documentation

BlockMass() [1/2]

llvm::bfi_detail::BlockMass::BlockMass ( )

default

Referenced by getEmpty(), and getFull().

BlockMass() [2/2]

llvm::bfi_detail::BlockMass::BlockMass ( uint64_t  Mass )

inlineexplicit

Definition at line 97 of file BlockFrequencyInfoImpl.h.

Member Function Documentation

dump()

LLVM_DUMP_METHOD void BlockMass::dump

(

)

const

Definition at line 72 of file BlockFrequencyInfoImpl.cpp.

References llvm::dbgs(), and print().

getEmpty()

static BlockMass llvm::bfi_detail::BlockMass::getEmpty ( )

inlinestatic

Definition at line 99 of file BlockFrequencyInfoImpl.h.

References BlockMass().

Referenced by llvm::bfi_detail::IrreducibleGraph::addNode(), and llvm::BlockFrequencyInfoImplBase::updateLoopWithIrreducible().

getFull()

static BlockMass llvm::bfi_detail::BlockMass::getFull ( )

inlinestatic

Definition at line 101 of file BlockFrequencyInfoImpl.h.

References BlockMass().

Referenced by llvm::BlockFrequencyInfoImplBase::adjustLoopHeaderMass(), llvm::BlockFrequencyInfoImplBase::computeLoopScale(), and llvm::BlockFrequencyInfoImplBase::distributeIrrLoopHeaderMass().

getMass()

uint64_t llvm::bfi_detail::BlockMass::getMass ( ) const

inline

Definition at line 105 of file BlockFrequencyInfoImpl.h.

Referenced by llvm::BlockFrequencyInfoImplBase::distributeMass(), and toScaled().

isEmpty()

bool llvm::bfi_detail::BlockMass::isEmpty ( ) const

inline

Definition at line 108 of file BlockFrequencyInfoImpl.h.

Referenced by llvm::BlockFrequencyInfoImplBase::computeLoopScale(), and operator!().

isFull()

bool llvm::bfi_detail::BlockMass::isFull ( ) const

inline

Definition at line 107 of file BlockFrequencyInfoImpl.h.

Referenced by toScaled().

operator!()

bool llvm::bfi_detail::BlockMass::operator! ( ) const

inline

Definition at line 110 of file BlockFrequencyInfoImpl.h.

References isEmpty().

operator!=()

bool llvm::bfi_detail::BlockMass::operator!= ( BlockMass  X ) const

inline

Definition at line 137 of file BlockFrequencyInfoImpl.h.

References X.

operator*=()

BlockMass & llvm::bfi_detail::BlockMass::operator*= ( BranchProbability  P )

inline

Definition at line 131 of file BlockFrequencyInfoImpl.h.

References P.

operator+=()

BlockMass & llvm::bfi_detail::BlockMass::operator+= ( BlockMass  X )

inline

Add another mass.

Adds another mass, saturating at isFull() rather than overflowing.

Definition at line 115 of file BlockFrequencyInfoImpl.h.

References X.

operator-=()

BlockMass & llvm::bfi_detail::BlockMass::operator-= ( BlockMass  X )

inline

Subtract another mass.

Subtracts another mass, saturating at isEmpty() rather than undeflowing.

Definition at line 125 of file BlockFrequencyInfoImpl.h.

References X.

operator<()

bool llvm::bfi_detail::BlockMass::operator< ( BlockMass  X ) const

inline

Definition at line 140 of file BlockFrequencyInfoImpl.h.

References X.

operator<=()

bool llvm::bfi_detail::BlockMass::operator<= ( BlockMass  X ) const

inline

Definition at line 138 of file BlockFrequencyInfoImpl.h.

References X.

operator==()

bool llvm::bfi_detail::BlockMass::operator== ( BlockMass  X ) const

inline

Definition at line 136 of file BlockFrequencyInfoImpl.h.

References X.

operator>()

bool llvm::bfi_detail::BlockMass::operator> ( BlockMass  X ) const

inline

Definition at line 141 of file BlockFrequencyInfoImpl.h.

References X.

operator>=()

bool llvm::bfi_detail::BlockMass::operator>= ( BlockMass  X ) const

inline

Definition at line 139 of file BlockFrequencyInfoImpl.h.

References X.

print()

raw_ostream & BlockMass::print

(

raw_ostream &

OS

)

const

Definition at line 82 of file BlockFrequencyInfoImpl.cpp.

References getHexDigit(), and OS.

Referenced by dump().

toScaled()

ScaledNumber< uint64_t > BlockMass::toScaled

(

)

const

Convert to scaled number.

Convert to ScaledNumber. isFull() gives 1.0, while isEmpty() gives slightly above 0.0.

Definition at line 65 of file BlockFrequencyInfoImpl.cpp.

References getMass(), and isFull().

Referenced by llvm::BlockFrequencyInfoImplBase::computeLoopScale(), and llvm::BlockFrequencyInfoImplBase::unwrapLoops().

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

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