PPCDispatchGroupSBHazardRecognizer - This class implements a scoreboard-based hazard recognizer for PPC ooo processors with dispatch-group hazards. More...

#include "Target/PowerPC/PPCHazardRecognizers.h"

Inheritance diagram for llvm::PPCDispatchGroupSBHazardRecognizer:

[legend]

Collaboration diagram for llvm::PPCDispatchGroupSBHazardRecognizer:

[legend]

Public Member Functions
	PPCDispatchGroupSBHazardRecognizer (const InstrItineraryData ItinData, const ScheduleDAG DAG_)

HazardType	getHazardType (SUnit *SU, int Stalls) override
	getHazardType - Return the hazard type of emitting this node. More...

bool	ShouldPreferAnother (SUnit *SU) override
	ShouldPreferAnother - This callback may be invoked if getHazardType returns NoHazard. More...

unsigned	PreEmitNoops (SUnit *SU) override
	PreEmitNoops - This callback is invoked prior to emitting an instruction. More...

void	EmitInstruction (SUnit *SU) override
	EmitInstruction - This callback is invoked when an instruction is emitted, to advance the hazard state. More...

void	AdvanceCycle () override
	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. More...

void	RecedeCycle () override
	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. More...

void	Reset () override
	Reset - This callback is invoked when a new block of instructions is about to be schedule. More...

void	EmitNoop () override
	EmitNoop - This callback is invoked when a noop was added to the instruction stream. More...

Public Member Functions inherited from llvm::ScoreboardHazardRecognizer
	ScoreboardHazardRecognizer (const InstrItineraryData II, const ScheduleDAG DAG, const char *ParentDebugType="")

bool	atIssueLimit () const override
	atIssueLimit - Return true if no more instructions may be issued in this cycle. More...

Public Member Functions inherited from llvm::ScheduleHazardRecognizer
	ScheduleHazardRecognizer ()=default

virtual	~ScheduleHazardRecognizer ()

unsigned	getMaxLookAhead () const

bool	isEnabled () const

virtual void	EmitInstruction (MachineInstr *)
	This overload will be used when the hazard recognizer is being used by a non-scheduling pass, which does not use SUnits. More...

virtual unsigned	PreEmitNoops (MachineInstr *)
	This overload will be used when the hazard recognizer is being used by a non-scheduling pass, which does not use SUnits. More...

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

Protected Attributes inherited from llvm::ScheduleHazardRecognizer
unsigned	MaxLookAhead = 0
	MaxLookAhead - Indicate the number of cycles in the scoreboard state. More...

Detailed Description

PPCDispatchGroupSBHazardRecognizer - This class implements a scoreboard-based hazard recognizer for PPC ooo processors with dispatch-group hazards.

Definition at line 26 of file PPCHazardRecognizers.h.

Constructor & Destructor Documentation

◆ PPCDispatchGroupSBHazardRecognizer()

llvm::PPCDispatchGroupSBHazardRecognizer::PPCDispatchGroupSBHazardRecognizer	(	const InstrItineraryData *	ItinData,
		const ScheduleDAG *	DAG_
	)

inline

Definition at line 35 of file PPCHazardRecognizers.h.

References AdvanceCycle(), EmitInstruction(), EmitNoop(), getHazardType(), PreEmitNoops(), RecedeCycle(), Reset(), and ShouldPreferAnother().

Member Function Documentation

◆ AdvanceCycle()

void PPCDispatchGroupSBHazardRecognizer::AdvanceCycle ( )

overridevirtual

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 207 of file PPCHazardRecognizers.cpp.

References llvm::ScoreboardHazardRecognizer::AdvanceCycle().

Referenced by PPCDispatchGroupSBHazardRecognizer().

◆ EmitInstruction()

void PPCDispatchGroupSBHazardRecognizer::EmitInstruction ( SUnit * )

overridevirtual

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

Reimplemented from llvm::ScoreboardHazardRecognizer.

Definition at line 176 of file PPCHazardRecognizers.cpp.

References llvm::dbgs(), llvm::ScoreboardHazardRecognizer::EmitInstruction(), llvm::MCInstrDesc::isBranch(), and LLVM_DEBUG.

Referenced by PPCDispatchGroupSBHazardRecognizer().

◆ EmitNoop()

void PPCDispatchGroupSBHazardRecognizer::EmitNoop ( )

overridevirtual

EmitNoop - This callback is invoked when a noop was added to the instruction stream.

Reimplemented from llvm::ScheduleHazardRecognizer.

Definition at line 221 of file PPCHazardRecognizers.cpp.

References llvm::PPC::DIR_PWR6, llvm::PPC::DIR_PWR7, llvm::PPC::DIR_PWR8, and llvm::PPC::DIR_PWR9.

Referenced by PPCDispatchGroupSBHazardRecognizer().

◆ getHazardType()

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

overridevirtual

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 141 of file PPCHazardRecognizers.cpp.

References llvm::ScoreboardHazardRecognizer::getHazardType(), and llvm::ScheduleHazardRecognizer::NoopHazard.

Referenced by PPCDispatchGroupSBHazardRecognizer().

◆ PreEmitNoops()

unsigned PPCDispatchGroupSBHazardRecognizer::PreEmitNoops ( SUnit * )

overridevirtual

PreEmitNoops - This callback is invoked prior to emitting an instruction.

It should return the number of noops to emit prior to the provided instruction. Note: This is only used during PostRA scheduling. EmitNoop is not called for these noops.

Reimplemented from llvm::ScheduleHazardRecognizer.

Definition at line 157 of file PPCHazardRecognizers.cpp.

References llvm::PPC::DIR_PWR6, llvm::PPC::DIR_PWR7, llvm::PPC::DIR_PWR8, llvm::PPC::DIR_PWR9, and llvm::ScheduleHazardRecognizer::PreEmitNoops().

Referenced by PPCDispatchGroupSBHazardRecognizer().

◆ RecedeCycle()

void PPCDispatchGroupSBHazardRecognizer::RecedeCycle ( )

overridevirtual

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 211 of file PPCHazardRecognizers.cpp.

References llvm_unreachable.

Referenced by PPCDispatchGroupSBHazardRecognizer().