llvm::ScoreboardHazardRecognizer Class Reference

#include <ScoreboardHazardRecognizer.h>

Inheritance diagram for llvm::ScoreboardHazardRecognizer:

Collaboration diagram for llvm::ScoreboardHazardRecognizer:

Public Member Functions
	ScoreboardHazardRecognizer (const InstrItineraryData *ItinData, const ScheduleDAG *DAG, const char *ParentDebugType="")
virtual bool	atIssueLimit () const
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::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

Definition at line 30 of file ScoreboardHazardRecognizer.h.

Constructor & Destructor Documentation

ScoreboardHazardRecognizer::ScoreboardHazardRecognizer	(	const InstrItineraryData *	ItinData,
		const ScheduleDAG *	DAG,
		const char *	ParentDebugType = ""
	)

Definition at line 32 of file ScoreboardHazardRecognizer.cpp.

References llvm::InstrItineraryData::beginStage(), llvm::dbgs(), DEBUG, llvm::InstrItineraryData::endStage(), llvm::InstrStage::getCycles(), llvm::InstrStage::getNextCycles(), llvm::InstrItineraryData::isEmpty(), llvm::ScheduleHazardRecognizer::isEnabled(), llvm::InstrItineraryData::isEndMarker(), llvm::MCSchedModel::IssueWidth, llvm::ScheduleHazardRecognizer::MaxLookAhead, and llvm::InstrItineraryData::SchedModel.

Member Function Documentation

void ScoreboardHazardRecognizer::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::ScheduleHazardRecognizer.

Reimplemented in llvm::ARMHazardRecognizer, and llvm::PPCScoreboardHazardRecognizer.

Definition at line 236 of file ScoreboardHazardRecognizer.cpp.

Referenced by llvm::PPCScoreboardHazardRecognizer::AdvanceCycle(), and llvm::ARMHazardRecognizer::AdvanceCycle().

bool ScoreboardHazardRecognizer::atIssueLimit ( ) const

virtual

atIssueLimit - Return true if no more instructions may be issued in this cycle.

Reimplemented from llvm::ScheduleHazardRecognizer.

Definition at line 110 of file ScoreboardHazardRecognizer.cpp.

void ScoreboardHazardRecognizer::EmitInstruction ( SUnit *  )

virtual

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

Reimplemented from llvm::ScheduleHazardRecognizer.

Reimplemented in llvm::ARMHazardRecognizer, and llvm::PPCScoreboardHazardRecognizer.

Definition at line 178 of file ScoreboardHazardRecognizer.cpp.

References llvm::InstrItineraryData::beginStage(), DEBUG, llvm::InstrItineraryData::endStage(), llvm::ScheduleDAG::getInstrDesc(), llvm::MCInstrDesc::getSchedClass(), llvm::InstrItineraryData::isEmpty(), llvm::TargetInstrInfo::isZeroCost(), llvm::MCInstrDesc::Opcode, llvm::InstrStage::Required, llvm::InstrStage::Reserved, and llvm::ScheduleDAG::TII.

Referenced by llvm::PPCScoreboardHazardRecognizer::EmitInstruction(), and llvm::ARMHazardRecognizer::EmitInstruction().

ScheduleHazardRecognizer::HazardType ScoreboardHazardRecognizer::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::ScheduleHazardRecognizer.

Reimplemented in llvm::ARMHazardRecognizer, and llvm::PPCScoreboardHazardRecognizer.

Definition at line 118 of file ScoreboardHazardRecognizer.cpp.

References llvm::InstrItineraryData::beginStage(), llvm::dbgs(), DEBUG, llvm::ScheduleDAG::dumpNode(), llvm::InstrItineraryData::endStage(), llvm::ScheduleDAG::getInstrDesc(), llvm::MCInstrDesc::getSchedClass(), llvm::ScheduleHazardRecognizer::Hazard, llvm::InstrItineraryData::isEmpty(), llvm::SUnit::NodeNum, llvm::ScheduleHazardRecognizer::NoHazard, llvm::InstrStage::Required, and llvm::InstrStage::Reserved.

Referenced by llvm::PPCScoreboardHazardRecognizer::getHazardType(), and llvm::ARMHazardRecognizer::getHazardType().

void ScoreboardHazardRecognizer::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::ScheduleHazardRecognizer.

Reimplemented in llvm::ARMHazardRecognizer.

Definition at line 242 of file ScoreboardHazardRecognizer.cpp.

void ScoreboardHazardRecognizer::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::ScheduleHazardRecognizer.

Reimplemented in llvm::ARMHazardRecognizer, and llvm::PPCScoreboardHazardRecognizer.

Definition at line 86 of file ScoreboardHazardRecognizer.cpp.

Referenced by llvm::PPCScoreboardHazardRecognizer::Reset(), and llvm::ARMHazardRecognizer::Reset().

---

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

• ScoreboardHazardRecognizer.h
• ScoreboardHazardRecognizer.cpp