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 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().

Referenced by copyState().

Member Function Documentation

◆ copyState()

void SystemZHazardRecognizer::copyState ( SystemZHazardRecognizer * Incoming )

Copy counters from end of single predecessor.

Definition at line 449 of file SystemZHazardRecognizer.cpp.

References CurGroupDbg, LLVM_DEBUG, and SystemZHazardRecognizer().

◆ dumpCurrGroup()

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

Definition at line 207 of file SystemZHazardRecognizer.cpp.

References CurGroupDbg, and llvm::dbgs().

Referenced by dumpState(), and EmitInstruction().

◆ dumpProcResourceCounters()

void SystemZHazardRecognizer::dumpProcResourceCounters ( ) const

Definition at line 222 of file SystemZHazardRecognizer.cpp.

References llvm::dbgs().

Referenced by dumpState().

◆ dumpState()

void SystemZHazardRecognizer::dumpState ( ) const

Definition at line 247 of file SystemZHazardRecognizer.cpp.

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

◆ dumpSU()

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

Definition at line 166 of file SystemZHazardRecognizer.cpp.

References llvm::MCSchedClassDesc::BeginGroup, llvm::MCSchedClassDesc::EndGroup, llvm::SUnit::getInstr(), llvm::MachineInstr::getOpcode(), getSchedClass(), llvm::SUnit::isUnbuffered, llvm::MCSchedClassDesc::isValid(), llvm::MCProcResourceDesc::Name, llvm::SUnit::NodeNum, and llvm::MCSchedClassDesc::NumMicroOps.

Referenced by EmitInstruction().

◆ 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 269 of file SystemZHazardRecognizer.cpp.

References assert(), CurGroupDbg, llvm::dbgs(), dumpCurrGroup(), dumpSU(), llvm::MCSchedClassDesc::EndGroup, llvm::SUnit::getInstr(), getSchedClass(), llvm::SUnit::isCall, llvm::SUnit::isUnbuffered, LLVM_DEBUG, ProcResCostLim, and Reset().

Referenced by emitInstruction().

◆ emitInstruction()

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

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

Definition at line 409 of file SystemZHazardRecognizer.cpp.

References assert(), EmitInstruction(), llvm::SUnit::hasReservedResource, isBranchRetTrap(), llvm::SUnit::isCall, llvm::SUnit::isUnbuffered, llvm::make_range(), and MI.

◆ 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(), and llvm::SUnit::SchedClass.

Referenced by dumpSU(), EmitInstruction(), groupingCost(), 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 339 of file SystemZHazardRecognizer.cpp.

References llvm::MCSchedClassDesc::BeginGroup, llvm::MCSchedClassDesc::EndGroup, llvm::SUnit::getInstr(), getSchedClass(), and llvm::MCSchedClassDesc::isValid().