Base class for BlockFrequencyInfoImpl. More...

#include "llvm/Analysis/BlockFrequencyInfoImpl.h"

Inheritance diagram for llvm::BlockFrequencyInfoImplBase:

Classes
struct	BlockNode
	Representative of a block. More...

struct	Distribution
	Distribution of unscaled probability weight. More...

struct	FrequencyData
	Stats about a block itself. More...

struct	LoopData
	Data about a loop. More...

struct	Weight
	Unscaled probability weight. More...

struct	WorkingData
	Index of loop information. More...

Public Types
using	Scaled64 = ScaledNumber< uint64_t >

using	BlockMass = bfi_detail::BlockMass

Public Member Functions
virtual	~BlockFrequencyInfoImplBase ()=default
	Virtual destructor.

bool	addLoopSuccessorsToDist (const LoopData *OuterLoop, LoopData &Loop, Distribution &Dist)
	Add all edges out of a packaged loop to the distribution.

bool	addToDist (Distribution &Dist, const LoopData *OuterLoop, const BlockNode &Pred, const BlockNode &Succ, uint64_t Weight)
	Add an edge to the distribution.

iterator_range< std::list< LoopData >::iterator >	analyzeIrreducible (const bfi_detail::IrreducibleGraph &G, LoopData *OuterLoop, std::list< LoopData >::iterator Insert)
	Analyze irreducible SCCs.

void	updateLoopWithIrreducible (LoopData &OuterLoop)
	Update a loop after packaging irreducible SCCs inside of it.

void	distributeMass (const BlockNode &Source, LoopData *OuterLoop, Distribution &Dist)
	Distribute mass according to a distribution.

void	computeLoopScale (LoopData &Loop)
	Compute the loop scale for a loop.

void	adjustLoopHeaderMass (LoopData &Loop)
	Adjust the mass of all headers in an irreducible loop.

void	distributeIrrLoopHeaderMass (Distribution &Dist)

void	packageLoop (LoopData &Loop)
	Package up a loop.

void	unwrapLoops ()
	Unwrap loops.

void	finalizeMetrics ()
	Finalize frequency metrics.

void	clear ()
	Clear all memory.

virtual std::string	getBlockName (const BlockNode &Node) const

std::string	getLoopName (const LoopData &Loop) const

virtual raw_ostream &	print (raw_ostream &OS) const

void	dump () const

Scaled64	getFloatingBlockFreq (const BlockNode &Node) const

BlockFrequency	getBlockFreq (const BlockNode &Node) const

std::optional< uint64_t >	getBlockProfileCount (const Function &F, const BlockNode &Node, bool AllowSynthetic=false) const

std::optional< uint64_t >	getProfileCountFromFreq (const Function &F, BlockFrequency Freq, bool AllowSynthetic=false) const

bool	isIrrLoopHeader (const BlockNode &Node)

void	setBlockFreq (const BlockNode &Node, BlockFrequency Freq)

BlockFrequency	getEntryFreq () const

Public Attributes
std::vector< FrequencyData >	Freqs
	Data about each block. This is used downstream.

SparseBitVector	IsIrrLoopHeader
	Whether each block is an irreducible loop header.

std::vector< WorkingData >	Working
	Loop data: see initializeLoops().

std::list< LoopData >	Loops
	Indexed information about loops.

Detailed Description

Base class for BlockFrequencyInfoImpl.

BlockFrequencyInfoImplBase has supporting data structures and some algorithms for BlockFrequencyInfoImplBase. Only algorithms that depend on the block type (or that call such algorithms) are skipped here.

Nevertheless, the majority of the overall algorithm documentation lives with BlockFrequencyInfoImpl. See there for details.

Definition at line 180 of file BlockFrequencyInfoImpl.h.

Member Typedef Documentation

◆ BlockMass

using llvm::BlockFrequencyInfoImplBase::BlockMass = bfi_detail::BlockMass

Definition at line 183 of file BlockFrequencyInfoImpl.h.

◆ Scaled64

using llvm::BlockFrequencyInfoImplBase::Scaled64 = ScaledNumber<uint64_t>

Definition at line 182 of file BlockFrequencyInfoImpl.h.

Constructor & Destructor Documentation

◆ ~BlockFrequencyInfoImplBase()

virtual llvm::BlockFrequencyInfoImplBase::~BlockFrequencyInfoImplBase ( )

virtualdefault

Virtual destructor.

Need a virtual destructor to mask the compiler warning about getBlockName().

Member Function Documentation

◆ addLoopSuccessorsToDist()

bool BlockFrequencyInfoImplBase::addLoopSuccessorsToDist	(	const LoopData *	OuterLoop,
		LoopData &	Loop,
		Distribution &	Dist
	)

Add all edges out of a packaged loop to the distribution.

Adds all edges from LocalLoopHead to Dist. Calls addToDist() to add each successor edge.

Returns: true unless there's an irreducible backedge.

Definition at line 374 of file BlockFrequencyInfoImpl.cpp.

References llvm::LoopBase< BlockT, LoopT >::getHeader(), and I.

◆ addToDist()

bool BlockFrequencyInfoImplBase::addToDist	(	Distribution &	Dist,
		const LoopData *	OuterLoop,
		const BlockNode &	Pred,
		const BlockNode &	Succ,
		uint64_t	Weight
	)

Add an edge to the distribution.

Adds an edge to Succ to Dist. If LoopHead.isValid(), then whether the edge is local/exit/backedge is in the context of LoopHead. Otherwise, every edge should be a local edge (since all the loops are packaged up).

Returns: true unless aborted due to an irreducible backedge.

Definition at line 312 of file BlockFrequencyInfoImpl.cpp.

References llvm::BlockFrequencyInfoImplBase::Distribution::addBackedge(), llvm::BlockFrequencyInfoImplBase::Distribution::addExit(), llvm::BlockFrequencyInfoImplBase::Distribution::addLocal(), assert(), llvm::dbgs(), llvm::bfi_detail::getBlockName(), llvm::BlockFrequencyInfoImplBase::BlockNode::Index, llvm::BlockFrequencyInfoImplBase::LoopData::isHeader(), llvm::BlockFrequencyInfoImplBase::LoopData::isIrreducible(), and LLVM_DEBUG.

◆ adjustLoopHeaderMass()

void BlockFrequencyInfoImplBase::adjustLoopHeaderMass ( LoopData & Loop )

Adjust the mass of all headers in an irreducible loop.

Initially, irreducible loops are assumed to distribute their mass equally among its headers. This can lead to wrong frequency estimates since some headers may be executed more frequently than others.

This adjusts header mass distribution so it matches the weights of the backedges going into each of the loop headers.

Definition at line 812 of file BlockFrequencyInfoImpl.cpp.

References llvm::BlockFrequencyInfoImplBase::Distribution::addLocal(), assert(), D, llvm::dbgs(), debugAssign(), llvm::bfi_detail::getBlockName(), llvm::bfi_detail::BlockMass::getFull(), H, LLVM_DEBUG, and llvm::BlockFrequencyInfoImplBase::Distribution::Weights.

◆ analyzeIrreducible()

iterator_range< std::list< LoopData >::iterator > BlockFrequencyInfoImplBase::analyzeIrreducible	(	const bfi_detail::IrreducibleGraph &	G,
		LoopData *	OuterLoop,
		std::list< LoopData >::iterator	Insert
	)

Analyze irreducible SCCs.

Separate irreducible SCCs from G, which is an explicit graph of OuterLoop (or the top-level function, if OuterLoop is nullptr). Insert them into Loops before Insert.

Returns: the LoopData nodes representing the irreducible SCCs.

Definition at line 781 of file BlockFrequencyInfoImpl.cpp.

References assert(), createIrreducibleLoop(), G, I, Loops, llvm::make_range(), and llvm::scc_begin().

◆ clear()

void BlockFrequencyInfoImplBase::clear ( )

Clear all memory.

Definition at line 292 of file BlockFrequencyInfoImpl.cpp.

References Loops.

Referenced by llvm::BlockFrequencyInfoImpl< BT >::calculate().

◆ computeLoopScale()

void BlockFrequencyInfoImplBase::computeLoopScale ( LoopData & Loop )

Compute the loop scale for a loop.

Definition at line 387 of file BlockFrequencyInfoImpl.cpp.

References llvm::dbgs(), llvm::bfi_detail::BlockMass::getFull(), llvm::ScaledNumber< DigitsT >::inverse(), llvm::bfi_detail::BlockMass::isEmpty(), LLVM_DEBUG, and llvm::bfi_detail::BlockMass::toScaled().

◆ distributeIrrLoopHeaderMass()

void BlockFrequencyInfoImplBase::distributeIrrLoopHeaderMass ( Distribution & Dist )

Definition at line 849 of file BlockFrequencyInfoImpl.cpp.

References assert(), D, debugAssign(), llvm::bfi_detail::BlockMass::getFull(), LLVM_DEBUG, and llvm::BlockFrequencyInfoImplBase::Distribution::Weights.

◆ distributeMass()

void BlockFrequencyInfoImplBase::distributeMass	(	const BlockNode &	Source,
		LoopData *	OuterLoop,
		Distribution &	Dist
	)

Distribute mass according to a distribution.

Distributes the mass in Source according to Dist. If LoopHead.isValid(), backedges and exits are stored in its entry in Loops.

Mass is distributed in parallel from two copies of the source mass.

Definition at line 447 of file BlockFrequencyInfoImpl.cpp.

References assert(), llvm::BlockFrequencyInfoImplBase::LoopData::BackedgeMass, D, llvm::dbgs(), debugAssign(), llvm::BlockFrequencyInfoImplBase::LoopData::Exits, llvm::BlockFrequencyInfoImplBase::LoopData::getHeaderIndex(), llvm::bfi_detail::BlockMass::getMass(), LLVM_DEBUG, llvm::SmallVectorTemplateBase< T, bool >::push_back(), and llvm::BlockFrequencyInfoImplBase::Distribution::Weights.

◆ dump()

void llvm::BlockFrequencyInfoImplBase::dump ( ) const

inline

Definition at line 521 of file BlockFrequencyInfoImpl.h.

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

◆ finalizeMetrics()

void BlockFrequencyInfoImplBase::finalizeMetrics ( )

Finalize frequency metrics.

Calculates final frequencies and cleans up no-longer-needed data structures.

Definition at line 546 of file BlockFrequencyInfoImpl.cpp.

References cleanup(), convertFloatingToInteger(), llvm::dump(), llvm::ScaledNumber< uint64_t >::getLargest(), llvm::ScaledNumber< uint64_t >::getZero(), LLVM_DEBUG, and Scaled.

◆ getBlockFreq()

BlockFrequency BlockFrequencyInfoImplBase::getBlockFreq ( const BlockNode & Node ) const

Definition at line 568 of file BlockFrequencyInfoImpl.cpp.

References llvm::CheckBFIUnknownBlockQueries, llvm::bfi_detail::getBlockName(), OS, and llvm::report_fatal_error().

Referenced by llvm::BlockFrequencyInfoImpl< BT >::getBlockFreq().

◆ getBlockName()

std::string BlockFrequencyInfoImplBase::getBlockName ( const BlockNode & Node ) const

virtual

Definition at line 628 of file BlockFrequencyInfoImpl.cpp.

◆ getBlockProfileCount()

std::optional< uint64_t > BlockFrequencyInfoImplBase::getBlockProfileCount	(	const Function &	F,
		const BlockNode &	Node,
		bool	AllowSynthetic = `false`
	)		const

Definition at line 584 of file BlockFrequencyInfoImpl.cpp.

References F.

Referenced by llvm::BlockFrequencyInfoImpl< BT >::getBlockProfileCount(), and llvm::BlockFrequencyInfoImpl< BT >::print().

◆ getEntryFreq()

BlockFrequency llvm::BlockFrequencyInfoImplBase::getEntryFreq ( ) const

inline

Definition at line 536 of file BlockFrequencyInfoImpl.h.

References assert(), Freqs, and llvm::Integer.

◆ getFloatingBlockFreq()

Scaled64 BlockFrequencyInfoImplBase::getFloatingBlockFreq ( const BlockNode & Node ) const

Definition at line 614 of file BlockFrequencyInfoImpl.cpp.

References llvm::ScaledNumber< uint64_t >::getZero().

Referenced by llvm::BlockFrequencyInfoImpl< BT >::getFloatingBlockFreq().

◆ getLoopName()

std::string BlockFrequencyInfoImplBase::getLoopName ( const LoopData & Loop ) const

Definition at line 633 of file BlockFrequencyInfoImpl.cpp.

References llvm::bfi_detail::getBlockName(), and llvm::LoopBase< BlockT, LoopT >::getHeader().

◆ getProfileCountFromFreq()

std::optional< uint64_t > BlockFrequencyInfoImplBase::getProfileCountFromFreq	(	const Function &	F,
		BlockFrequency	Freq,
		bool	AllowSynthetic = `false`
	)		const

Definition at line 590 of file BlockFrequencyInfoImpl.cpp.

References F, llvm::BlockFrequency::getFrequency(), llvm::APInt::getLimitedValue(), and llvm::APInt::lshr().

Referenced by llvm::BlockFrequencyInfoImpl< BT >::getProfileCountFromFreq().

◆ isIrrLoopHeader()

bool BlockFrequencyInfoImplBase::isIrrLoopHeader ( const BlockNode & Node )

Definition at line 607 of file BlockFrequencyInfoImpl.cpp.

Referenced by llvm::BlockFrequencyInfoImpl< BT >::isIrrLoopHeader().

◆ packageLoop()

void BlockFrequencyInfoImplBase::packageLoop ( LoopData & Loop )

Package up a loop.

Definition at line 422 of file BlockFrequencyInfoImpl.cpp.

References llvm::dbgs(), llvm::bfi_detail::getBlockName(), and LLVM_DEBUG.

◆ print()

virtual raw_ostream & llvm::BlockFrequencyInfoImplBase::print ( raw_ostream & OS ) const

inlinevirtual

Reimplemented in llvm::BlockFrequencyInfoImpl< BT >, and llvm::BlockFrequencyInfoImpl< llvm::BitTracker >.

Definition at line 520 of file BlockFrequencyInfoImpl.h.

References OS.

Referenced by dump().

◆ setBlockFreq()

void BlockFrequencyInfoImplBase::setBlockFreq	(	const BlockNode &	Node,
		BlockFrequency	Freq
	)

Definition at line 620 of file BlockFrequencyInfoImpl.cpp.

References assert(), and llvm::BlockFrequency::getFrequency().

Referenced by llvm::BlockFrequencyInfoImpl< BT >::setBlockFreq().

◆ unwrapLoops()

void BlockFrequencyInfoImplBase::unwrapLoops ( )

Unwrap loops.

Definition at line 537 of file BlockFrequencyInfoImpl.cpp.

References Loops, Scaled, llvm::bfi_detail::BlockMass::toScaled(), and unwrapLoop().

◆ updateLoopWithIrreducible()

void BlockFrequencyInfoImplBase::updateLoopWithIrreducible ( LoopData & OuterLoop )

Update a loop after packaging irreducible SCCs inside of it.

Update OuterLoop. Before finding irreducible control flow, it was partway through computeMassInLoop(), so LoopData::Exits and LoopData::BackedgeMass need to be reset. Also, nodes that were packaged up need to be removed from OuterLoop::Nodes.

Definition at line 801 of file BlockFrequencyInfoImpl.cpp.

References llvm::BlockFrequencyInfoImplBase::LoopData::BackedgeMass, llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::SmallVectorImpl< T >::clear(), llvm::SmallVectorTemplateCommon< T, typename >::end(), llvm::SmallVectorImpl< T >::erase(), llvm::BlockFrequencyInfoImplBase::LoopData::Exits, llvm::bfi_detail::BlockMass::getEmpty(), I, and llvm::BlockFrequencyInfoImplBase::LoopData::Nodes.

Member Data Documentation

◆ Freqs

std::vector<FrequencyData> llvm::BlockFrequencyInfoImplBase::Freqs

Data about each block. This is used downstream.

Definition at line 422 of file BlockFrequencyInfoImpl.h.

Referenced by getEntryFreq().

◆ IsIrrLoopHeader

SparseBitVector llvm::BlockFrequencyInfoImplBase::IsIrrLoopHeader

Whether each block is an irreducible loop header.

This is used downstream.

Definition at line 426 of file BlockFrequencyInfoImpl.h.

◆ Loops

std::list<LoopData> llvm::BlockFrequencyInfoImplBase::Loops

Indexed information about loops.

Definition at line 432 of file BlockFrequencyInfoImpl.h.

◆ Working

std::vector<WorkingData> llvm::BlockFrequencyInfoImplBase::Working

Loop data: see initializeLoops().

Definition at line 429 of file BlockFrequencyInfoImpl.h.

Referenced by llvm::bfi_detail::IrreducibleGraph::addEdges(), llvm::bfi_detail::IrreducibleGraph::addNode(), llvm::bfi_detail::IrreducibleGraph::addNodesInFunction(), and llvm::bfi_detail::IrreducibleGraph::initialize().

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

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

Classes

Public Types

Public Member Functions

Public Attributes