#include "Target/AMDGPU/GCNHazardRecognizer.h"

Inheritance diagram for llvm::GCNHazardRecognizer:

Collaboration diagram for llvm::GCNHazardRecognizer:

Public Member Functions
	GCNHazardRecognizer (const MachineFunction &MF)

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

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

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

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

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

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

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

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

virtual	~ScheduleHazardRecognizer ()

unsigned	getMaxLookAhead () const

bool	isEnabled () const

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

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

Definition at line 33 of file GCNHazardRecognizer.h.

Constructor & Destructor Documentation

◆ GCNHazardRecognizer()

GCNHazardRecognizer::GCNHazardRecognizer ( const MachineFunction & MF )

Definition at line 40 of file GCNHazardRecognizer.cpp.

References llvm::ScheduleHazardRecognizer::MaxLookAhead.

Member Function Documentation

◆ AdvanceCycle()

void GCNHazardRecognizer::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::ScheduleHazardRecognizer.

Definition at line 226 of file GCNHazardRecognizer.cpp.

References llvm::ScheduleHazardRecognizer::getMaxLookAhead(), llvm::SIInstrInfo::getNumWaitStates(), llvm::MachineInstr::getOpcode(), and llvm::MachineInstr::isDebugInstr().

Referenced by atIssueLimit().

◆ atIssueLimit()

bool llvm::GCNHazardRecognizer::atIssueLimit ( ) const

inlineoverridevirtual

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

FIXME: remove this once MachineScheduler is the only client.

Reimplemented from llvm::ScheduleHazardRecognizer.

Definition at line 81 of file GCNHazardRecognizer.h.

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

◆ EmitInstruction() [1/2]

void GCNHazardRecognizer::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 51 of file GCNHazardRecognizer.cpp.

References llvm::SUnit::getInstr().

Referenced by atIssueLimit().

◆ EmitInstruction() [2/2]

void GCNHazardRecognizer::EmitInstruction ( MachineInstr * )

overridevirtual

This overload will be used when the hazard recognizer is being used by a non-scheduling pass, which does not use SUnits.

Reimplemented from llvm::ScheduleHazardRecognizer.

Definition at line 55 of file GCNHazardRecognizer.cpp.

References MI.

◆ EmitNoop()

void GCNHazardRecognizer::EmitNoop ( )

overridevirtual

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

Reimplemented from llvm::ScheduleHazardRecognizer.

Definition at line 222 of file GCNHazardRecognizer.cpp.

Referenced by atIssueLimit().

◆ getHazardType()

ScheduleHazardRecognizer::HazardType GCNHazardRecognizer::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::ScheduleHazardRecognizer.

Definition at line 124 of file GCNHazardRecognizer.cpp.

References llvm::SUnit::getInstr(), llvm::MachineInstr::getOpcode(), llvm::GCNSubtarget::hasReadM0MovRelInterpHazard(), llvm::GCNSubtarget::hasReadM0SendMsgHazard(), isDivFMas(), llvm::SIInstrInfo::isDPP(), llvm::SIInstrInfo::isFLAT(), llvm::MachineInstr::isInlineAsm(), isRFE(), isRWLane(), isSendMsgTraceDataOrGDS(), isSGetReg(), isSMovRel(), llvm::SIInstrInfo::isSMRD(), isSSetReg(), llvm::SIInstrInfo::isVALU(), llvm::SIInstrInfo::isVINTRP(), llvm::SIInstrInfo::isVMEM(), MI, llvm::ScheduleHazardRecognizer::NoHazard, and llvm::ScheduleHazardRecognizer::NoopHazard.

Referenced by atIssueLimit().

◆ PreEmitNoops() [1/2]

unsigned GCNHazardRecognizer::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 175 of file GCNHazardRecognizer.cpp.

References llvm::SUnit::getInstr().

Referenced by atIssueLimit().

◆ PreEmitNoops() [2/2]

unsigned GCNHazardRecognizer::PreEmitNoops ( MachineInstr * )

overridevirtual

This overload will be used when the hazard recognizer is being used by a non-scheduling pass, which does not use SUnits.

Reimplemented from llvm::ScheduleHazardRecognizer.

Definition at line 179 of file GCNHazardRecognizer.cpp.

References llvm::MachineInstr::getOpcode(), llvm::GCNSubtarget::hasReadM0MovRelInterpHazard(), llvm::GCNSubtarget::hasReadM0SendMsgHazard(), isDivFMas(), llvm::SIInstrInfo::isDPP(), llvm::SIInstrInfo::isFLAT(), llvm::MachineInstr::isInlineAsm(), isRFE(), isRWLane(), isSendMsgTraceDataOrGDS(), isSGetReg(), isSMovRel(), llvm::SIInstrInfo::isSMRD(), isSSetReg(), llvm::SIInstrInfo::isVALU(), llvm::SIInstrInfo::isVINTRP(), llvm::SIInstrInfo::isVMEM(), and llvm::max().

◆ RecedeCycle()

void GCNHazardRecognizer::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::ScheduleHazardRecognizer.

Definition at line 261 of file GCNHazardRecognizer.cpp.

References llvm::GCNSubtarget::getRegisterInfo(), llvm::ISD::INLINEASM, isSSetReg(), llvm_unreachable, llvm::max(), MI, and Reg.

Referenced by atIssueLimit().

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