llvm::ARMHazardRecognizer Class Reference

#include <ARMHazardRecognizer.h>

Inheritance diagram for llvm::ARMHazardRecognizer:

Collaboration diagram for llvm::ARMHazardRecognizer:

Public Member Functions
	ARMHazardRecognizer (const InstrItineraryData *ItinData, const ScheduleDAG *DAG)
virtual HazardType	getHazardType (SUnit *SU, int Stalls)
virtual void	Reset ()
virtual void	EmitInstruction (SUnit *SU)
virtual void	AdvanceCycle ()
virtual void	RecedeCycle ()
Public Member Functions inherited from llvm::ScoreboardHazardRecognizer
	ScoreboardHazardRecognizer (const InstrItineraryData *ItinData, const ScheduleDAG *DAG, const char *ParentDebugType="")
virtual bool	atIssueLimit () const
Public Member Functions inherited from llvm::ScheduleHazardRecognizer
	ScheduleHazardRecognizer ()
virtual	~ScheduleHazardRecognizer ()
unsigned	getMaxLookAhead () const
bool	isEnabled () const
virtual void	EmitNoop ()

Additional Inherited Members
Public Types inherited from llvm::ScheduleHazardRecognizer
enum	HazardType { NoHazard, Hazard, NoopHazard }
Protected Attributes inherited from llvm::ScheduleHazardRecognizer
unsigned	MaxLookAhead

Detailed Description

ARMHazardRecognizer handles special constraints that are not expressed in the scheduling itinerary. This is only used during postRA scheduling. The ARM preRA scheduler uses an unspecialized instance of the ScoreboardHazardRecognizer.

Definition at line 30 of file ARMHazardRecognizer.h.

Constructor & Destructor Documentation

llvm::ARMHazardRecognizer::ARMHazardRecognizer ( const InstrItineraryData *  ItinData, const ScheduleDAG *  DAG  )

inline

Definition at line 35 of file ARMHazardRecognizer.h.

Member Function Documentation

void ARMHazardRecognizer::AdvanceCycle ( )

virtual

AdvanceCycle - This callback is invoked whenever the next top-down instruction to be scheduled cannot issue in the current cycle, either because of latency or resource conflicts. This should increment the internal state of the hazard recognizer so that previously "Hazard" instructions will now not be hazards.

Reimplemented from llvm::ScoreboardHazardRecognizer.

Definition at line 95 of file ARMHazardRecognizer.cpp.

References llvm::ScoreboardHazardRecognizer::AdvanceCycle().

void ARMHazardRecognizer::EmitInstruction ( SUnit *  )

virtual

EmitInstruction - This callback is invoked when an instruction is emitted, to advance the hazard state.

Reimplemented from llvm::ScoreboardHazardRecognizer.

Definition at line 85 of file ARMHazardRecognizer.cpp.

References llvm::ScoreboardHazardRecognizer::EmitInstruction(), llvm::SUnit::getInstr(), llvm::MachineInstr::isDebugValue(), and llvm::A64CC::MI.

ScheduleHazardRecognizer::HazardType ARMHazardRecognizer::getHazardType ( SUnit *  m, int  Stalls  )

virtual

getHazardType - Return the hazard type of emitting this node. There are three possible results. Either:

• NoHazard: it is legal to issue this instruction on this cycle.
• Hazard: issuing this instruction would stall the machine. If some other instruction is available, issue it first.
• NoopHazard: issuing this instruction would break the program. If some other instruction can be issued, do so, otherwise issue a noop.

Reimplemented from llvm::ScoreboardHazardRecognizer.

Definition at line 35 of file ARMHazardRecognizer.cpp.

References llvm::MachineBasicBlock::begin(), llvm::ARMBaseInstrInfo::canCauseFpMLxStall(), llvm::ARMII::DomainGeneral, llvm::ARMII::DomainMask, llvm::MachineInstr::getDesc(), llvm::ScoreboardHazardRecognizer::getHazardType(), llvm::SUnit::getInstr(), llvm::TargetMachine::getInstrInfo(), llvm::MachineInstr::getOpcode(), llvm::MachineInstr::getParent(), llvm::MachineBasicBlock::getParent(), llvm::ARMBaseInstrInfo::getRegisterInfo(), llvm::ARMBaseInstrInfo::getSubtarget(), llvm::MachineFunction::getTarget(), hasRAWHazard(), llvm::ScheduleHazardRecognizer::Hazard, I, llvm::MachineInstr::isBarrier(), llvm::MachineInstr::isDebugValue(), llvm::ARMBaseInstrInfo::isFpMLxInstruction(), llvm::ARMSubtarget::isLikeA9(), llvm::MachineInstr::mayLoad(), llvm::MachineInstr::mayStore(), llvm::A64CC::MI, llvm::prior(), TII, llvm::SystemZISD::TM, and llvm::MCInstrDesc::TSFlags.

void ARMHazardRecognizer::RecedeCycle ( )

virtual

RecedeCycle - This callback is invoked whenever the next bottom-up instruction to be scheduled cannot issue in the current cycle, either because of latency or resource conflicts.

Reimplemented from llvm::ScoreboardHazardRecognizer.

Definition at line 102 of file ARMHazardRecognizer.cpp.

References llvm_unreachable.

void ARMHazardRecognizer::Reset ( )

virtual

Reset - This callback is invoked when a new block of instructions is about to be schedule. The hazard state should be set to an initialized state.

Reimplemented from llvm::ScoreboardHazardRecognizer.

Definition at line 79 of file ARMHazardRecognizer.cpp.

References llvm::ScoreboardHazardRecognizer::Reset().

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

• ARMHazardRecognizer.h
• ARMHazardRecognizer.cpp