LLVM  9.0.0svn
Public Types | Public Member Functions | List of all members
llvm::SMSchedule Class Reference

This class represents the scheduled code. More...

#include "llvm/CodeGen/MachinePipeliner.h"

Public Types

using sched_iterator = DenseMap< int, std::deque< SUnit * > >::iterator
 Iterators for the cycle to instruction map. More...
 
using const_sched_iterator = DenseMap< int, std::deque< SUnit * > >::const_iterator
 

Public Member Functions

 SMSchedule (MachineFunction *mf)
 
void reset ()
 
void setInitiationInterval (int ii)
 Set the initiation interval for this schedule. More...
 
int getFirstCycle () const
 Return the first cycle in the completed schedule. More...
 
int getFinalCycle () const
 Return the last cycle in the finalized schedule. More...
 
int earliestCycleInChain (const SDep &Dep)
 Return the cycle of the earliest scheduled instruction in the dependence chain. More...
 
int latestCycleInChain (const SDep &Dep)
 Return the cycle of the latest scheduled instruction in the dependence chain. More...
 
void computeStart (SUnit *SU, int *MaxEarlyStart, int *MinLateStart, int *MinEnd, int *MaxStart, int II, SwingSchedulerDAG *DAG)
 Compute the scheduling start slot for the instruction. More...
 
bool insert (SUnit *SU, int StartCycle, int EndCycle, int II)
 Try to schedule the node at the specified StartCycle and continue until the node is schedule or the EndCycle is reached. More...
 
bool isScheduledAtStage (SUnit *SU, unsigned StageNum)
 Return true if the instruction is scheduled at the specified stage. More...
 
int stageScheduled (SUnit *SU) const
 Return the stage for a scheduled instruction. More...
 
unsigned cycleScheduled (SUnit *SU) const
 Return the cycle for a scheduled instruction. More...
 
unsigned getMaxStageCount ()
 Return the maximum stage count needed for this schedule. More...
 
unsigned getStagesForReg (int Reg, unsigned CurStage)
 Return the max. More...
 
unsigned getStagesForPhi (int Reg)
 The number of stages for a Phi is a little different than other instructions. More...
 
std::deque< SUnit * > & getInstructions (int cycle)
 Return the instructions that are scheduled at the specified cycle. More...
 
bool isValidSchedule (SwingSchedulerDAG *SSD)
 
void finalizeSchedule (SwingSchedulerDAG *SSD)
 After the schedule has been formed, call this function to combine the instructions from the different stages/cycles. More...
 
void orderDependence (SwingSchedulerDAG *SSD, SUnit *SU, std::deque< SUnit *> &Insts)
 Order the instructions within a cycle so that the definitions occur before the uses. More...
 
bool isLoopCarried (SwingSchedulerDAG *SSD, MachineInstr &Phi)
 Return true if the scheduled Phi has a loop carried operand. More...
 
bool isLoopCarriedDefOfUse (SwingSchedulerDAG *SSD, MachineInstr *Def, MachineOperand &MO)
 Return true if the instruction is a definition that is loop carried and defines the use on the next iteration. More...
 
void print (raw_ostream &os) const
 Print the schedule information to the given output. More...
 
void dump () const
 Utility function used for debugging to print the schedule. More...
 

Detailed Description

This class represents the scheduled code.

The main data structure is a map from scheduled cycle to instructions. During scheduling, the data structure explicitly represents all stages/iterations. When the algorithm finshes, the schedule is collapsed into a single stage, which represents instructions from different loop iterations.

The SMS algorithm allows negative values for cycles, so the first cycle in the schedule is the smallest cycle value.

Definition at line 474 of file MachinePipeliner.h.

Member Typedef Documentation

◆ const_sched_iterator

Definition at line 545 of file MachinePipeliner.h.

◆ sched_iterator

using llvm::SMSchedule::sched_iterator = DenseMap<int, std::deque<SUnit *> >::iterator

Iterators for the cycle to instruction map.

Definition at line 543 of file MachinePipeliner.h.

Constructor & Destructor Documentation

◆ SMSchedule()

llvm::SMSchedule::SMSchedule ( MachineFunction mf)
inline

Definition at line 507 of file MachinePipeliner.h.

Member Function Documentation

◆ computeStart()

void SMSchedule::computeStart ( SUnit SU,
int *  MaxEarlyStart,
int *  MinLateStart,
int *  MinEnd,
int *  MaxStart,
int  II,
SwingSchedulerDAG DAG 
)

Compute the scheduling start slot for the instruction.

The start slot depends on any predecessor or successor nodes scheduled already.

Definition at line 3299 of file MachinePipeliner.cpp.

References llvm::SwingSchedulerDAG::getDistance(), llvm::SDep::getLatency(), llvm::SDep::getSUnit(), I, llvm::SwingSchedulerDAG::isBackedge(), llvm::SwingSchedulerDAG::isLoopCarriedDep(), llvm::max(), and llvm::SUnit::Preds.

Referenced by isIntersect().

◆ cycleScheduled()

unsigned llvm::SMSchedule::cycleScheduled ( SUnit SU) const
inline

Return the cycle for a scheduled instruction.

This function normalizes the first cycle to be 0.

Definition at line 563 of file MachinePipeliner.h.

References assert().

Referenced by llvm::SwingSchedulerDAG::applyInstrChange().

◆ dump()

LLVM_DUMP_METHOD void SMSchedule::dump ( ) const

Utility function used for debugging to print the schedule.

Definition at line 3810 of file MachinePipeliner.cpp.

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

◆ earliestCycleInChain()

int SMSchedule::earliestCycleInChain ( const SDep Dep)

◆ finalizeSchedule()

void SMSchedule::finalizeSchedule ( SwingSchedulerDAG SSD)

◆ getFinalCycle()

int llvm::SMSchedule::getFinalCycle ( ) const
inline

Return the last cycle in the finalized schedule.

Definition at line 528 of file MachinePipeliner.h.

Referenced by isIntersect().

◆ getFirstCycle()

int llvm::SMSchedule::getFirstCycle ( ) const
inline

Return the first cycle in the completed schedule.

This can be a negative value.

Definition at line 525 of file MachinePipeliner.h.

Referenced by isIntersect().

◆ getInstructions()

std::deque<SUnit *>& llvm::SMSchedule::getInstructions ( int  cycle)
inline

Return the instructions that are scheduled at the specified cycle.

Definition at line 597 of file MachinePipeliner.h.

References llvm::tgtok::Def, llvm::Pass::dump(), and llvm::Pass::print().

Referenced by isIntersect().

◆ getMaxStageCount()

unsigned llvm::SMSchedule::getMaxStageCount ( )
inline

Return the maximum stage count needed for this schedule.

Definition at line 570 of file MachinePipeliner.h.

Referenced by isIntersect(), and llvm::SwingSchedulerDAG::schedule().

◆ getStagesForPhi()

unsigned llvm::SMSchedule::getStagesForPhi ( int  Reg)
inline

The number of stages for a Phi is a little different than other instructions.

The minimum value computed in RegToStageDiff is 1 because we assume the Phi is needed for at least 1 iteration. This is not the case if the loop value is scheduled prior to the Phi in the same stage. This function returns the number of stages or iterations needed between the Phi definition and any uses.

Definition at line 589 of file MachinePipeliner.h.

References Reg.

Referenced by hasUseAfterLoop().

◆ getStagesForReg()

unsigned llvm::SMSchedule::getStagesForReg ( int  Reg,
unsigned  CurStage 
)
inline

Return the max.

number of stages/iterations that can occur between a register definition and its uses.

Definition at line 576 of file MachinePipeliner.h.

References Reg.

Referenced by hasUseAfterLoop().

◆ insert()

bool SMSchedule::insert ( SUnit SU,
int  StartCycle,
int  EndCycle,
int  II 
)

Try to schedule the node at the specified StartCycle and continue until the node is schedule or the EndCycle is reached.

This function returns true if the node is scheduled. This routine may search either forward or backward for a place to insert the instruction based upon the relative values of StartCycle and EndCycle.

Definition at line 3190 of file MachinePipeliner.cpp.

References assert(), llvm::dbgs(), llvm::MachineInstr::dump(), E, llvm::SUnit::getInstr(), llvm::MachineInstr::getOpcode(), I, LLVM_DEBUG, and llvm::ARM_MB::ST.

Referenced by isIntersect().

◆ isLoopCarried()

bool SMSchedule::isLoopCarried ( SwingSchedulerDAG SSD,
MachineInstr Phi 
)

Return true if the scheduled Phi has a loop carried operand.

Definition at line 3481 of file MachinePipeliner.cpp.

References assert(), llvm::MachineInstr::getParent(), getPhiRegs(), llvm::ScheduleDAGInstrs::getSUnit(), llvm::MachineInstr::isPHI(), and MRI.

Referenced by hasUseAfterLoop().

◆ isLoopCarriedDefOfUse()

bool SMSchedule::isLoopCarriedDefOfUse ( SwingSchedulerDAG SSD,
MachineInstr Def,
MachineOperand MO 
)

Return true if the instruction is a definition that is loop carried and defines the use on the next iteration.

v1 = phi(v2, v3) (Def) v3 = op v1 (MO) = v1 If MO appears before Def, then then v1 and v3 may get assigned to the same register.

Definition at line 3509 of file MachinePipeliner.cpp.

References getLoopPhiReg(), llvm::MachineInstr::getNumOperands(), llvm::MachineInstr::getOperand(), llvm::MachineInstr::getParent(), llvm::MachineOperand::getReg(), llvm::MachineOperand::isDef(), llvm::MachineInstr::isPHI(), llvm::MachineOperand::isReg(), and MRI.

◆ isScheduledAtStage()

bool llvm::SMSchedule::isScheduledAtStage ( SUnit SU,
unsigned  StageNum 
)
inline

Return true if the instruction is scheduled at the specified stage.

Definition at line 548 of file MachinePipeliner.h.

Referenced by isIntersect().

◆ isValidSchedule()

bool SMSchedule::isValidSchedule ( SwingSchedulerDAG SSD)

◆ latestCycleInChain()

int SMSchedule::latestCycleInChain ( const SDep Dep)

◆ orderDependence()

void SMSchedule::orderDependence ( SwingSchedulerDAG SSD,
SUnit SU,
std::deque< SUnit *> &  Insts 
)

◆ print()

void SMSchedule::print ( raw_ostream os) const

Print the schedule information to the given output.

Definition at line 3795 of file MachinePipeliner.cpp.

References llvm::SUnit::getInstr(), llvm::SUnit::NodeNum, and llvm::MachineInstr::print().

◆ reset()

void llvm::SMSchedule::reset ( )
inline

◆ setInitiationInterval()

void llvm::SMSchedule::setInitiationInterval ( int  ii)
inline

Set the initiation interval for this schedule.

Definition at line 521 of file MachinePipeliner.h.

Referenced by isIntersect().

◆ stageScheduled()

int llvm::SMSchedule::stageScheduled ( SUnit SU) const
inline

Return the stage for a scheduled instruction.

Return -1 if the instruction has not been scheduled.

Definition at line 554 of file MachinePipeliner.h.

Referenced by llvm::SwingSchedulerDAG::applyInstrChange(), hasUseAfterLoop(), and isIntersect().


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