SystemZHazardRecognizer maintains the state for one MBB during scheduling. More...

#include "Target/SystemZ/SystemZHazardRecognizer.h"

Inheritance diagram for llvm::SystemZHazardRecognizer:

Public Member Functions
	SystemZHazardRecognizer (const SystemZInstrInfo tii, const TargetSchedModel SM)

HazardType	getHazardType (SUnit *SU, int Stalls=0) override
	getHazardType - Return the hazard type of emitting this node.

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

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

const MCSchedClassDesc *	getSchedClass (SUnit *SU) const
	Resolves and cache a resolved scheduling class for an SUnit.

void	emitInstruction (MachineInstr *MI, bool TakenBranch=false)
	Wrap a non-scheduled instruction in an SU and emit it.

int	groupingCost (SUnit *SU) const
	Return the cost of decoder grouping for SU.

int	resourcesCost (SUnit *SU)
	Return the cost of SU in regards to processor resources usage.

void	dumpSU (SUnit *SU, raw_ostream &OS) const

void	dumpCurrGroup (std::string Msg="") const

void	dumpProcResourceCounters () const

void	dumpState () const

MachineBasicBlock::iterator	getLastEmittedMI ()

void	copyState (SystemZHazardRecognizer *Incoming)
	Copy counters from end of single predecessor.

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

virtual	~ScheduleHazardRecognizer ()

unsigned	getMaxLookAhead () const

bool	isEnabled () const

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

virtual HazardType	getHazardType (SUnit *, int Stalls=0)
	getHazardType - Return the hazard type of emitting this node.

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

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

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.

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

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.

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

virtual void	AdvanceCycle ()
	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.

virtual void	RecedeCycle ()
	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.

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

virtual void	EmitNoops (unsigned Quantity)
	EmitNoops - This callback is invoked when noops were added to the instruction stream.

Public Attributes
std::string	CurGroupDbg

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.

Detailed Description

SystemZHazardRecognizer maintains the state for one MBB during scheduling.

Definition at line 45 of file SystemZHazardRecognizer.h.

Constructor & Destructor Documentation

◆ SystemZHazardRecognizer()

llvm::SystemZHazardRecognizer::SystemZHazardRecognizer	(	const SystemZInstrInfo *	tii,
		const TargetSchedModel *	SM
	)

inline

Definition at line 110 of file SystemZHazardRecognizer.h.

References Reset(), and TII.

Member Function Documentation

◆ copyState()

void SystemZHazardRecognizer::copyState ( SystemZHazardRecognizer * Incoming )

Copy counters from end of single predecessor.

Definition at line 450 of file SystemZHazardRecognizer.cpp.

References CurGroupDbg, and LLVM_DEBUG.

Referenced by llvm::SystemZPostRASchedStrategy::enterMBB().

◆ dumpCurrGroup()

void SystemZHazardRecognizer::dumpCurrGroup ( std::string Msg = "" ) const

Definition at line 208 of file SystemZHazardRecognizer.cpp.

References CurGroupDbg, and llvm::dbgs().

Referenced by dumpState(), and EmitInstruction().

◆ dumpProcResourceCounters()

void SystemZHazardRecognizer::dumpProcResourceCounters ( ) const

Definition at line 223 of file SystemZHazardRecognizer.cpp.

References llvm::dbgs(), llvm::TargetSchedModel::getNumProcResourceKinds(), llvm::TargetSchedModel::getProcResource(), and llvm::MCProcResourceDesc::Name.

Referenced by dumpState().

◆ dumpState()

void SystemZHazardRecognizer::dumpState ( ) const

Definition at line 248 of file SystemZHazardRecognizer.cpp.

References llvm::dbgs(), dumpCurrGroup(), and dumpProcResourceCounters().

Referenced by llvm::SystemZPostRASchedStrategy::enterMBB(), and llvm::SystemZPostRASchedStrategy::initialize().

◆ dumpSU()

void SystemZHazardRecognizer::dumpSU	(	SUnit *	SU,
		raw_ostream &	OS
	)		const

Definition at line 167 of file SystemZHazardRecognizer.cpp.

References llvm::SUnit::getInstr(), llvm::MachineInstr::getOpcode(), llvm::TargetSchedModel::getProcResource(), getSchedClass(), llvm::TargetSchedModel::getWriteProcResBegin(), llvm::TargetSchedModel::getWriteProcResEnd(), llvm::SUnit::isUnbuffered, llvm::MCProcResourceDesc::Name, llvm::SUnit::NodeNum, and OS.

Referenced by EmitInstruction(), and llvm::SystemZPostRASchedStrategy::pickNode().

◆ emitInstruction()

void SystemZHazardRecognizer::emitInstruction	(	MachineInstr *	MI,
		bool	TakenBranch = `false`
	)

Wrap a non-scheduled instruction in an SU and emit it.

Definition at line 410 of file SystemZHazardRecognizer.cpp.

References assert(), llvm::MCProcResourceDesc::BufferSize, EmitInstruction(), llvm::TargetSchedModel::getProcResource(), llvm::TargetSchedModel::getWriteProcResBegin(), llvm::TargetSchedModel::getWriteProcResEnd(), llvm::SUnit::hasReservedResource, isBranchRetTrap(), llvm::SUnit::isCall, llvm::SUnit::isUnbuffered, llvm::make_range(), MI, and llvm::TargetSchedModel::resolveSchedClass().

Referenced by llvm::SystemZPostRASchedStrategy::enterMBB().

◆ EmitInstruction()

void SystemZHazardRecognizer::EmitInstruction ( SUnit * )

overridevirtual

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

Reimplemented from llvm::ScheduleHazardRecognizer.

Definition at line 270 of file SystemZHazardRecognizer.cpp.

References assert(), llvm::MCProcResourceDesc::BufferSize, CurGroupDbg, llvm::dbgs(), dumpCurrGroup(), dumpSU(), llvm::SUnit::getInstr(), llvm::TargetSchedModel::getProcResource(), getSchedClass(), llvm::TargetSchedModel::getWriteProcResBegin(), llvm::TargetSchedModel::getWriteProcResEnd(), llvm::SUnit::isCall, llvm::SUnit::isUnbuffered, LLVM_DEBUG, llvm::MCProcResourceDesc::Name, ProcResCostLim, and Reset().

Referenced by emitInstruction(), and llvm::SystemZPostRASchedStrategy::schedNode().

◆ getHazardType()

ScheduleHazardRecognizer::HazardType SystemZHazardRecognizer::getHazardType	(	SUnit *	,
		int	Stalls = `0`
	)

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::ScheduleHazardRecognizer.

Definition at line 76 of file SystemZHazardRecognizer.cpp.

References llvm::ScheduleHazardRecognizer::Hazard, and llvm::ScheduleHazardRecognizer::NoHazard.

◆ getLastEmittedMI()

MachineBasicBlock::iterator llvm::SystemZHazardRecognizer::getLastEmittedMI ( )

inline

Definition at line 153 of file SystemZHazardRecognizer.h.

◆ getSchedClass()

const MCSchedClassDesc * llvm::SystemZHazardRecognizer::getSchedClass ( SUnit * SU ) const

inline

Resolves and cache a resolved scheduling class for an SUnit.

Definition at line 121 of file SystemZHazardRecognizer.h.

References llvm::SUnit::getInstr(), llvm::TargetSchedModel::hasInstrSchedModel(), llvm::TargetSchedModel::resolveSchedClass(), and llvm::SUnit::SchedClass.

Referenced by dumpSU(), EmitInstruction(), groupingCost(), llvm::SystemZPostRASchedStrategy::releaseTopNode(), and resourcesCost().

◆ groupingCost()

int SystemZHazardRecognizer::groupingCost ( SUnit * SU ) const

Return the cost of decoder grouping for SU.

If SU must start a new decoder group, this is negative if this fits the schedule or positive if it would mean ending a group prematurely. For normal instructions this returns 0.

Definition at line 340 of file SystemZHazardRecognizer.cpp.

References llvm::SUnit::getInstr(), and getSchedClass().