LLVM: llvm::ScheduleDAGTopologicalSort Class Reference

LLVM 8.0.1

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

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. More...

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

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

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

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

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 693 of file ScheduleDAG.h.

Member Typedef Documentation

◆ const_iterator

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

Definition at line 747 of file ScheduleDAG.h.

◆ const_reverse_iterator

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

Definition at line 754 of file ScheduleDAG.h.

◆ iterator

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

Definition at line 746 of file ScheduleDAG.h.

◆ reverse_iterator

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

Definition at line 753 of file ScheduleDAG.h.

Constructor & Destructor Documentation

◆ ScheduleDAGTopologicalSort()

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

Definition at line 701 of file ScheduleDAG.cpp.

References llvm::ScheduleHazardRecognizer::~ScheduleHazardRecognizer().

Referenced by IsReachable().

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 513 of file ScheduleDAG.cpp.

References assert(), DFS(), and llvm::SUnit::NodeNum.

Referenced by swapAntiDependences().

◆ begin() [1/2]

iterator llvm::ScheduleDAGTopologicalSort::begin ( )

inline

Definition at line 748 of file ScheduleDAG.h.

Referenced by llvm::SIScheduleDAGMI::SIScheduleDAGMI().

◆ begin() [2/2]

const_iterator llvm::ScheduleDAGTopologicalSort::begin ( ) const

inline

Definition at line 749 of file ScheduleDAG.h.

◆ end() [1/2]

iterator llvm::ScheduleDAGTopologicalSort::end ( )

inline

Definition at line 750 of file ScheduleDAG.h.

Referenced by llvm::SIScheduleDAGMI::SIScheduleDAGMI().

◆ end() [2/2]

const_iterator llvm::ScheduleDAGTopologicalSort::end ( ) const

inline

Definition at line 751 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 561 of file ScheduleDAG.cpp.

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

Referenced by hasDataDependencyPred().

◆ InitDAGTopologicalSorting()

void ScheduleDAGTopologicalSort::InitDAGTopologicalSorting ( )

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

Definition at line 434 of file ScheduleDAG.cpp.

References assert(), llvm::ScheduleDAG::ExitSU, llvm::SDep::getSUnit(), llvm::SUnit::NodeNum, llvm::X86II::PD, llvm::SUnit::Preds, and llvm::ScheduleDAG::SUnits.

Referenced by llvm::GCNIterativeScheduler::BuildDAG::BuildDAG(), and llvm::SIScheduleDAGMI::SIScheduleDAGMI().

◆ IsReachable()

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

Checks if SU is reachable from TargetSU.

Definition at line 678 of file ScheduleDAG.cpp.

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

Referenced by swapAntiDependences().

◆ rbegin() [1/2]

reverse_iterator llvm::ScheduleDAGTopologicalSort::rbegin ( )

inline

Definition at line 755 of file ScheduleDAG.h.

Referenced by llvm::SIScheduleDAGMI::SIScheduleDAGMI().

◆ rbegin() [2/2]

const_reverse_iterator llvm::ScheduleDAGTopologicalSort::rbegin ( ) const

inline

Definition at line 756 of file ScheduleDAG.h.

◆ RemovePred()

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

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

Definition at line 529 of file ScheduleDAG.cpp.

References llvm::make_range(), llvm::SUnit::NodeNum, llvm::SUnit::Succs, and llvm::ScheduleDAG::SUnits.

◆ rend() [1/2]

reverse_iterator llvm::ScheduleDAGTopologicalSort::rend ( )

inline

Definition at line 757 of file ScheduleDAG.h.

Referenced by llvm::SIScheduleDAGMI::SIScheduleDAGMI().

◆ rend() [2/2]

const_reverse_iterator llvm::ScheduleDAGTopologicalSort::rend ( ) const

inline

Definition at line 758 of file ScheduleDAG.h.

◆ WillCreateCycle()

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

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

Definition at line 667 of file ScheduleDAG.cpp.

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

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

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