This class can compute a topological ordering for SUnits and provides methods for dynamically updating the ordering as new edges are added. More...

#include "llvm/CodeGen/ScheduleDAG.h"

Public Types
typedef std::vector< int >::iterator	iterator

typedef std::vector< int >::const_iterator	const_iterator

typedef std::vector< int >::reverse_iterator	reverse_iterator

typedef std::vector< int >::const_reverse_iterator	const_reverse_iterator

Public Member Functions
	ScheduleDAGTopologicalSort (std::vector< SUnit > &SUnits, SUnit *ExitSU)

void	AddSUnitWithoutPredecessors (const SUnit *SU)
	Add a SUnit without predecessors to the end of the topological order.

void	InitDAGTopologicalSorting ()
	Creates the initial topological ordering from the DAG to be scheduled.

std::vector< int >	GetSubGraph (const SUnit &StartSU, const SUnit &TargetSU, bool &Success)
	Returns an array of SUs that are both in the successor subtree of StartSU and in the predecessor subtree of TargetSU.

bool	IsReachable (const SUnit SU, const SUnit TargetSU)
	Checks if `SU` is reachable from `TargetSU`.

bool	WillCreateCycle (SUnit TargetSU, SUnit SU)
	Returns true if addPred(TargetSU, SU) creates a cycle.

void	AddPred (SUnit Y, SUnit X)
	Updates the topological ordering to accommodate an edge to be added from SUnit `X` to SUnit `Y`.

void	AddPredQueued (SUnit Y, SUnit X)
	Queues an update to the topological ordering to accommodate an edge to be added from SUnit `X` to SUnit `Y`.

void	RemovePred (SUnit M, SUnit N)
	Updates the topological ordering to accommodate an edge to be removed from the specified node `N` from the predecessors of the current node `M`.

void	MarkDirty ()
	Mark the ordering as temporarily broken, after a new node has been added.

iterator	begin ()

const_iterator	begin () const

iterator	end ()

const_iterator	end () const

reverse_iterator	rbegin ()

const_reverse_iterator	rbegin () const

reverse_iterator	rend ()

const_reverse_iterator	rend () const

Detailed Description

This class can compute a topological ordering for SUnits and provides methods for dynamically updating the ordering as new edges are added.

This allows a very fast implementation of IsReachable, for example.

Definition at line 720 of file ScheduleDAG.h.

Member Typedef Documentation

◆ const_iterator

typedef std::vector<int>::const_iterator llvm::ScheduleDAGTopologicalSort::const_iterator

Definition at line 797 of file ScheduleDAG.h.

◆ const_reverse_iterator

typedef std::vector<int>::const_reverse_iterator llvm::ScheduleDAGTopologicalSort::const_reverse_iterator

Definition at line 804 of file ScheduleDAG.h.

◆ iterator

typedef std::vector<int>::iterator llvm::ScheduleDAGTopologicalSort::iterator

Definition at line 796 of file ScheduleDAG.h.

◆ reverse_iterator

typedef std::vector<int>::reverse_iterator llvm::ScheduleDAGTopologicalSort::reverse_iterator

Definition at line 803 of file ScheduleDAG.h.

Constructor & Destructor Documentation

◆ ScheduleDAGTopologicalSort()

ScheduleDAGTopologicalSort::ScheduleDAGTopologicalSort	(	std::vector< SUnit > &	SUnits,
		SUnit *	ExitSU
	)

Definition at line 750 of file ScheduleDAG.cpp.

Member Function Documentation

◆ AddPred()

void ScheduleDAGTopologicalSort::AddPred	(	SUnit *	Y,
		SUnit *	X
	)

Updates the topological ordering to accommodate an edge to be added from SUnit X to SUnit Y.

Definition at line 550 of file ScheduleDAG.cpp.

References assert(), llvm::BitVector::reset(), X, and Y.

◆ AddPredQueued()

void ScheduleDAGTopologicalSort::AddPredQueued	(	SUnit *	Y,
		SUnit *	X
	)

Queues an update to the topological ordering to accommodate an edge to be added from SUnit X to SUnit Y.

Definition at line 538 of file ScheduleDAG.cpp.

References X, and Y.

Referenced by llvm::ScheduleDAGInstrs::addEdge().

◆ AddSUnitWithoutPredecessors()

void ScheduleDAGTopologicalSort::AddSUnitWithoutPredecessors ( const SUnit * SU )

Add a SUnit without predecessors to the end of the topological order.

It also must be the first new node added to the DAG.

Definition at line 717 of file ScheduleDAG.cpp.

References assert(), llvm::SUnit::NodeNum, llvm::SUnit::NumPreds, and llvm::BitVector::resize().

◆ begin() [1/2]

iterator llvm::ScheduleDAGTopologicalSort::begin ( )

inline

Definition at line 798 of file ScheduleDAG.h.

◆ begin() [2/2]

const_iterator llvm::ScheduleDAGTopologicalSort::begin ( ) const

inline

Definition at line 799 of file ScheduleDAG.h.

◆ end() [1/2]

iterator llvm::ScheduleDAGTopologicalSort::end ( )

inline

Definition at line 800 of file ScheduleDAG.h.

◆ end() [2/2]

const_iterator llvm::ScheduleDAGTopologicalSort::end ( ) const

inline

Definition at line 801 of file ScheduleDAG.h.

◆ GetSubGraph()

std::vector< int > ScheduleDAGTopologicalSort::GetSubGraph	(	const SUnit &	StartSU,
		const SUnit &	TargetSU,
		bool &	Success
	)

Returns an array of SUs that are both in the successor subtree of StartSU and in the predecessor subtree of TargetSU.

StartSU and TargetSU are not in the array. Success is false if TargetSU is not in the successor subtree of StartSU, else it is true.

Definition at line 599 of file ScheduleDAG.cpp.

References assert(), llvm::SUnit::isBoundaryNode(), llvm::SUnit::NodeNum, llvm::SUnit::Preds, llvm::BitVector::push_back(), llvm::BitVector::reset(), llvm::BitVector::resize(), llvm::reverse(), llvm::BitVector::set(), Success, llvm::SUnit::Succs, and llvm::BitVector::test().

◆ InitDAGTopologicalSorting()

void ScheduleDAGTopologicalSort::InitDAGTopologicalSorting ( )

Creates the initial topological ordering from the DAG to be scheduled.

Definition at line 440 of file ScheduleDAG.cpp.

References assert(), llvm::SDep::getSUnit(), llvm::SUnit::NodeNum, llvm::SUnit::Preds, llvm::SmallVectorImpl< T >::reserve(), and llvm::BitVector::resize().

Referenced by llvm::GCNIterativeScheduler::BuildDAG::BuildDAG(), llvm::SwingSchedulerDAG::schedule(), and llvm::VLIWMachineScheduler::schedule().

◆ IsReachable()

bool ScheduleDAGTopologicalSort::IsReachable	(	const SUnit *	SU,
		const SUnit *	TargetSU
	)

Checks if SU is reachable from TargetSU.

Definition at line 725 of file ScheduleDAG.cpp.

References assert(), llvm::SUnit::NodeNum, and llvm::BitVector::reset().

Referenced by llvm::ScheduleDAGInstrs::addEdge(), llvm::ScheduleDAGInstrs::canAddEdge(), llvm::ScheduleDAGInstrs::IsReachable(), and WillCreateCycle().

◆ MarkDirty()

void llvm::ScheduleDAGTopologicalSort::MarkDirty ( )

inline

Mark the ordering as temporarily broken, after a new node has been added.

Definition at line 794 of file ScheduleDAG.h.

Referenced by llvm::ScheduleDAGInstrs::buildSchedGraph().

◆ rbegin() [1/2]

reverse_iterator llvm::ScheduleDAGTopologicalSort::rbegin ( )

inline

Definition at line 805 of file ScheduleDAG.h.

◆ rbegin() [2/2]

const_reverse_iterator llvm::ScheduleDAGTopologicalSort::rbegin ( ) const

inline

Definition at line 806 of file ScheduleDAG.h.

◆ RemovePred()

void ScheduleDAGTopologicalSort::RemovePred	(	SUnit *	M,
		SUnit *	N
	)

Updates the topological ordering to accommodate an edge to be removed from the specified node N from the predecessors of the current node M.

Definition at line 568 of file ScheduleDAG.cpp.

◆ rend() [1/2]

reverse_iterator llvm::ScheduleDAGTopologicalSort::rend ( )

inline

Definition at line 807 of file ScheduleDAG.h.

◆ rend() [2/2]

const_reverse_iterator llvm::ScheduleDAGTopologicalSort::rend ( ) const

inline

Definition at line 808 of file ScheduleDAG.h.

◆ WillCreateCycle()

bool ScheduleDAGTopologicalSort::WillCreateCycle	(	SUnit *	TargetSU,
		SUnit *	SU
	)

Returns true if addPred(TargetSU, SU) creates a cycle.

Definition at line 705 of file ScheduleDAG.cpp.

References llvm::SDep::getSUnit(), llvm::SDep::isAssignedRegDep(), IsReachable(), and llvm::SUnit::Preds.

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

include/llvm/CodeGen/ScheduleDAG.h
lib/CodeGen/ScheduleDAG.cpp

Public Types

Public Member Functions

Detailed Description

Member Typedef Documentation

◆ const_iterator

◆ const_reverse_iterator

◆ iterator

◆ reverse_iterator

Constructor & Destructor Documentation

◆ ScheduleDAGTopologicalSort()

Member Function Documentation

◆ AddPred()

◆ AddPredQueued()

◆ AddSUnitWithoutPredecessors()

◆ begin() [1/2]

◆ begin() [2/2]

◆ end() [1/2]

◆ end() [2/2]

◆ GetSubGraph()

◆ InitDAGTopologicalSorting()

◆ IsReachable()

◆ MarkDirty()

◆ rbegin() [1/2]

◆ rbegin() [2/2]

◆ RemovePred()

◆ rend() [1/2]

◆ rend() [2/2]

◆ WillCreateCycle()