LLVM  6.0.0svn
Public Types | Public Member Functions | List of all members
llvm::ScheduleDAGTopologicalSort Class Reference

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 694 of file ScheduleDAG.h.

Member Typedef Documentation

◆ const_iterator

Definition at line 748 of file ScheduleDAG.h.

◆ const_reverse_iterator

Definition at line 755 of file ScheduleDAG.h.

◆ iterator

Definition at line 747 of file ScheduleDAG.h.

◆ reverse_iterator

Definition at line 754 of file ScheduleDAG.h.

Constructor & Destructor Documentation

◆ ScheduleDAGTopologicalSort()

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

Definition at line 712 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 524 of file ScheduleDAG.cpp.

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

◆ begin() [1/2]

iterator llvm::ScheduleDAGTopologicalSort::begin ( )
inline

Definition at line 749 of file ScheduleDAG.h.

Referenced by ignoreDependence(), and llvm::SIScheduleDAGMI::SIScheduleDAGMI().

◆ begin() [2/2]

const_iterator llvm::ScheduleDAGTopologicalSort::begin ( ) const
inline

Definition at line 750 of file ScheduleDAG.h.

◆ end() [1/2]

iterator llvm::ScheduleDAGTopologicalSort::end ( )
inline

Definition at line 751 of file ScheduleDAG.h.

Referenced by ignoreDependence(), and llvm::SIScheduleDAGMI::SIScheduleDAGMI().

◆ end() [2/2]

const_iterator llvm::ScheduleDAGTopologicalSort::end ( ) const
inline

Definition at line 752 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 572 of file ScheduleDAG.cpp.

References assert(), I, llvm::SUnit::isBoundaryNode(), llvm::SUnit::NodeNum, llvm::SUnit::Preds, 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 ( )

◆ IsReachable()

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

Checks if SU is reachable from TargetSU.

Definition at line 689 of file ScheduleDAG.cpp.

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

Referenced by getUnderlyingObjects().

◆ rbegin() [1/2]

reverse_iterator llvm::ScheduleDAGTopologicalSort::rbegin ( )
inline

Definition at line 756 of file ScheduleDAG.h.

Referenced by ignoreDependence(), and llvm::SIScheduleDAGMI::SIScheduleDAGMI().

◆ rbegin() [2/2]

const_reverse_iterator llvm::ScheduleDAGTopologicalSort::rbegin ( ) const
inline

Definition at line 757 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 540 of file ScheduleDAG.cpp.

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

Referenced by getUnderlyingObjects().

◆ rend() [1/2]

reverse_iterator llvm::ScheduleDAGTopologicalSort::rend ( )
inline

Definition at line 758 of file ScheduleDAG.h.

Referenced by ignoreDependence(), and llvm::SIScheduleDAGMI::SIScheduleDAGMI().

◆ rend() [2/2]

const_reverse_iterator llvm::ScheduleDAGTopologicalSort::rend ( ) const
inline

Definition at line 759 of file ScheduleDAG.h.

◆ WillCreateCycle()

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

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

Definition at line 678 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: