LLVM  14.0.0git
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llvm::ConvergingVLIWScheduler Class Reference

#include "llvm/CodeGen/VLIWMachineScheduler.h"

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Classes

struct  SchedCandidate
 Store the state used by ConvergingVLIWScheduler heuristics, required for the lifetime of one invocation of pickNode(). More...
 
struct  VLIWSchedBoundary
 Each Scheduling boundary is associated with ready queues. More...
 

Public Types

enum  { TopQID = 1, BotQID = 2, LogMaxQID = 2 }
 SUnit::NodeQueueId: 0 (none), 1 (top), 2 (bot), 3 (both) More...
 

Public Member Functions

 ConvergingVLIWScheduler ()
 
virtual ~ConvergingVLIWScheduler ()=default
 
void initialize (ScheduleDAGMI *dag) override
 Initialize the strategy after building the DAG for a new region. More...
 
SUnitpickNode (bool &IsTopNode) override
 Pick the best node to balance the schedule. Implements MachineSchedStrategy. More...
 
void schedNode (SUnit *SU, bool IsTopNode) override
 Update the scheduler's state after scheduling a node. More...
 
void releaseTopNode (SUnit *SU) override
 When all predecessor dependencies have been resolved, free this node for top-down scheduling. More...
 
void releaseBottomNode (SUnit *SU) override
 When all successor dependencies have been resolved, free this node for bottom-up scheduling. More...
 
unsigned reportPackets ()
 
- Public Member Functions inherited from llvm::MachineSchedStrategy
virtual ~MachineSchedStrategy ()=default
 
virtual void initPolicy (MachineBasicBlock::iterator Begin, MachineBasicBlock::iterator End, unsigned NumRegionInstrs)
 Optionally override the per-region scheduling policy. More...
 
virtual void dumpPolicy () const
 
virtual bool shouldTrackPressure () const
 Check if pressure tracking is needed before building the DAG and initializing this strategy. More...
 
virtual bool shouldTrackLaneMasks () const
 Returns true if lanemasks should be tracked. More...
 
virtual bool doMBBSchedRegionsTopDown () const
 
virtual void enterMBB (MachineBasicBlock *MBB)
 Tell the strategy that MBB is about to be processed. More...
 
virtual void leaveMBB ()
 Tell the strategy that current MBB is done. More...
 
virtual void registerRoots ()
 Notify this strategy that all roots have been released (including those that depend on EntrySU or ExitSU). More...
 
virtual void scheduleTree (unsigned SubtreeID)
 Scheduler callback to notify that a new subtree is scheduled. More...
 

Protected Types

enum  CandResult {
  NoCand, NodeOrder, SingleExcess, SingleCritical,
  SingleMax, MultiPressure, BestCost, Weak
}
 Represent the type of SchedCandidate found within a single queue. More...
 

Protected Member Functions

virtual VLIWResourceModelcreateVLIWResourceModel (const TargetSubtargetInfo &STI, const TargetSchedModel *SchedModel) const
 
SUnitpickNodeBidrectional (bool &IsTopNode)
 Pick the best candidate node from either the top or bottom queue. More...
 
int pressureChange (const SUnit *SU, bool isBotUp)
 Check if the instruction changes the register pressure of a register in the high pressure set. More...
 
virtual int SchedulingCost (ReadyQueue &Q, SUnit *SU, SchedCandidate &Candidate, RegPressureDelta &Delta, bool verbose)
 Single point to compute overall scheduling cost. More...
 
CandResult pickNodeFromQueue (VLIWSchedBoundary &Zone, const RegPressureTracker &RPTracker, SchedCandidate &Candidate)
 Pick the best candidate from the top queue. More...
 
void traceCandidate (const char *Label, const ReadyQueue &Q, SUnit *SU, int Cost, PressureChange P=PressureChange())
 
void readyQueueVerboseDump (const RegPressureTracker &RPTracker, SchedCandidate &Candidate, ReadyQueue &Q)
 

Protected Attributes

VLIWMachineSchedulerDAG = nullptr
 
const TargetSchedModelSchedModel = nullptr
 
VLIWSchedBoundary Top
 
VLIWSchedBoundary Bot
 
SmallVector< bool > HighPressureSets
 List of pressure sets that have a high pressure level in the region. More...
 

Static Protected Attributes

static constexpr unsigned PriorityOne = 200
 
static constexpr unsigned PriorityTwo = 50
 
static constexpr unsigned PriorityThree = 75
 
static constexpr unsigned ScaleTwo = 10
 

Detailed Description

Definition at line 88 of file VLIWMachineScheduler.h.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

SUnit::NodeQueueId: 0 (none), 1 (top), 2 (bot), 3 (both)

Enumerator
TopQID 
BotQID 
LogMaxQID 

Definition at line 219 of file VLIWMachineScheduler.h.

◆ CandResult

Represent the type of SchedCandidate found within a single queue.

Enumerator
NoCand 
NodeOrder 
SingleExcess 
SingleCritical 
SingleMax 
MultiPressure 
BestCost 
Weak 

Definition at line 105 of file VLIWMachineScheduler.h.

Constructor & Destructor Documentation

◆ ConvergingVLIWScheduler()

llvm::ConvergingVLIWScheduler::ConvergingVLIWScheduler ( )
inline

Definition at line 221 of file VLIWMachineScheduler.h.

◆ ~ConvergingVLIWScheduler()

virtual llvm::ConvergingVLIWScheduler::~ConvergingVLIWScheduler ( )
virtualdefault

Member Function Documentation

◆ createVLIWResourceModel()

VLIWResourceModel * ConvergingVLIWScheduler::createVLIWResourceModel ( const TargetSubtargetInfo STI,
const TargetSchedModel SchedModel 
) const
protectedvirtual

Reimplemented in llvm::HexagonConvergingVLIWScheduler.

Definition at line 307 of file VLIWMachineScheduler.cpp.

References SchedModel.

Referenced by initialize().

◆ initialize()

void ConvergingVLIWScheduler::initialize ( ScheduleDAGMI DAG)
overridevirtual

◆ pickNode()

SUnit * ConvergingVLIWScheduler::pickNode ( bool &  IsTopNode)
overridevirtual

◆ pickNodeBidrectional()

SUnit * ConvergingVLIWScheduler::pickNodeBidrectional ( bool &  IsTopNode)
protected

◆ pickNodeFromQueue()

ConvergingVLIWScheduler::CandResult ConvergingVLIWScheduler::pickNodeFromQueue ( VLIWSchedBoundary Zone,
const RegPressureTracker RPTracker,
SchedCandidate Candidate 
)
protected

◆ pressureChange()

int ConvergingVLIWScheduler::pressureChange ( const SUnit SU,
bool  isBotUp 
)
protected

Check if the instruction changes the register pressure of a register in the high pressure set.

The function returns a negative value if the pressure decreases and a positive value is the pressure increases. If the instruction doesn't use a high pressure register or doesn't change the register pressure, then return 0.

Definition at line 582 of file VLIWMachineScheduler.cpp.

References DAG, llvm::ScheduleDAGMILive::getPressureDiff(), HighPressureSets, P, and llvm::X86II::PD.

Referenced by SchedulingCost().

◆ readyQueueVerboseDump()

void ConvergingVLIWScheduler::readyQueueVerboseDump ( const RegPressureTracker RPTracker,
SchedCandidate Candidate,
ReadyQueue Q 
)
protected

◆ releaseBottomNode()

void ConvergingVLIWScheduler::releaseBottomNode ( SUnit SU)
overridevirtual

◆ releaseTopNode()

void ConvergingVLIWScheduler::releaseTopNode ( SUnit SU)
overridevirtual

◆ reportPackets()

unsigned llvm::ConvergingVLIWScheduler::reportPackets ( )
inline

◆ schedNode()

void ConvergingVLIWScheduler::schedNode ( SUnit SU,
bool  IsTopNode 
)
overridevirtual

Update the scheduler's state after scheduling a node.

This is the same node that was just returned by pickNode(). However, VLIWMachineScheduler needs to update it's state based on the current cycle before MachineSchedStrategy does.

Implements llvm::MachineSchedStrategy.

Definition at line 1001 of file VLIWMachineScheduler.cpp.

References Bot, llvm::SUnit::BotReadyCycle, llvm::ConvergingVLIWScheduler::VLIWSchedBoundary::bumpNode(), llvm::ConvergingVLIWScheduler::VLIWSchedBoundary::CurrCycle, Top, and llvm::SUnit::TopReadyCycle.

◆ SchedulingCost()

int ConvergingVLIWScheduler::SchedulingCost ( ReadyQueue Q,
SUnit SU,
SchedCandidate Candidate,
RegPressureDelta Delta,
bool  verbose 
)
protectedvirtual

◆ traceCandidate()

void ConvergingVLIWScheduler::traceCandidate ( const char *  Label,
const ReadyQueue Q,
SUnit SU,
int  Cost,
PressureChange  P = PressureChange() 
)
protected

Member Data Documentation

◆ Bot

VLIWSchedBoundary llvm::ConvergingVLIWScheduler::Bot
protected

◆ DAG

VLIWMachineScheduler* llvm::ConvergingVLIWScheduler::DAG = nullptr
protected

◆ HighPressureSets

SmallVector<bool> llvm::ConvergingVLIWScheduler::HighPressureSets
protected

List of pressure sets that have a high pressure level in the region.

Definition at line 215 of file VLIWMachineScheduler.h.

Referenced by initialize(), and pressureChange().

◆ PriorityOne

constexpr unsigned llvm::ConvergingVLIWScheduler::PriorityOne = 200
staticconstexprprotected

Definition at line 118 of file VLIWMachineScheduler.h.

Referenced by SchedulingCost().

◆ PriorityThree

constexpr unsigned llvm::ConvergingVLIWScheduler::PriorityThree = 75
staticconstexprprotected

Definition at line 120 of file VLIWMachineScheduler.h.

Referenced by SchedulingCost().

◆ PriorityTwo

constexpr unsigned llvm::ConvergingVLIWScheduler::PriorityTwo = 50
staticconstexprprotected

◆ ScaleTwo

constexpr unsigned llvm::ConvergingVLIWScheduler::ScaleTwo = 10
staticconstexprprotected

Definition at line 121 of file VLIWMachineScheduler.h.

Referenced by SchedulingCost().

◆ SchedModel

const TargetSchedModel* llvm::ConvergingVLIWScheduler::SchedModel = nullptr
protected

◆ Top

VLIWSchedBoundary llvm::ConvergingVLIWScheduler::Top
protected

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