LLVM: llvm::ScheduleHazardRecognizer Class Reference (original) (raw)

HazardRecognizer - This determines whether or not an instruction can be issued this cycle, and whether or not a noop needs to be inserted to handle the hazard. More...

#include "[llvm/CodeGen/ScheduleHazardRecognizer.h](ScheduleHazardRecognizer%5F8h%5Fsource.html)"

Public Types
enum	HazardType { NoHazard, Hazard, NoopHazard }

Public Member Functions
	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.

Protected Attributes
unsigned	MaxLookAhead = 0
	MaxLookAhead - Indicate the number of cycles in the scoreboard state.

HazardRecognizer - This determines whether or not an instruction can be issued this cycle, and whether or not a noop needs to be inserted to handle the hazard.

Definition at line 25 of file ScheduleHazardRecognizer.h.

◆ HazardType

llvm::ScheduleHazardRecognizer::ScheduleHazardRecognizer ( )	default

◆ ~ScheduleHazardRecognizer()

ScheduleHazardRecognizer::~ScheduleHazardRecognizer ( )	virtualdefault

◆ AdvanceCycle()

virtual void llvm::ScheduleHazardRecognizer::AdvanceCycle ( )	inlinevirtual

◆ atIssueLimit()

virtual bool llvm::ScheduleHazardRecognizer::atIssueLimit ( ) const	inlinevirtual

◆ EmitInstruction() [1/2]

virtual void llvm::ScheduleHazardRecognizer::EmitInstruction ( MachineInstr * )	inlinevirtual

◆ EmitInstruction() [2/2]

virtual void llvm::ScheduleHazardRecognizer::EmitInstruction ( SUnit * )	inlinevirtual

◆ EmitNoop()

virtual void llvm::ScheduleHazardRecognizer::EmitNoop ( )	inlinevirtual

◆ EmitNoops()

virtual void llvm::ScheduleHazardRecognizer::EmitNoops ( unsigned Quantity)	inlinevirtual

◆ getHazardType()

virtual HazardType llvm::ScheduleHazardRecognizer::getHazardType ( SUnit * , int Stalls = 0 )	inlinevirtual

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 in llvm::ARMBankConflictHazardRecognizer, llvm::ARMHazardRecognizerFPMLx, llvm::GCNHazardRecognizer, llvm::HexagonHazardRecognizer, llvm::MultiHazardRecognizer, llvm::PPCDispatchGroupSBHazardRecognizer, llvm::PPCHazardRecognizer970, llvm::ScoreboardHazardRecognizer, and llvm::SystemZHazardRecognizer.

Definition at line 60 of file ScheduleHazardRecognizer.h.

References NoHazard.

◆ getMaxLookAhead()

unsigned llvm::ScheduleHazardRecognizer::getMaxLookAhead ( ) const	inline

◆ isEnabled()

bool llvm::ScheduleHazardRecognizer::isEnabled ( ) const	inline

◆ PreEmitNoops() [1/2]

◆ PreEmitNoops() [2/2]

virtual unsigned llvm::ScheduleHazardRecognizer::PreEmitNoops ( SUnit * )	inlinevirtual

◆ RecedeCycle()

virtual void llvm::ScheduleHazardRecognizer::RecedeCycle ( )	inlinevirtual

◆ Reset()

virtual void llvm::ScheduleHazardRecognizer::Reset ( )	inlinevirtual

◆ ShouldPreferAnother()

virtual bool llvm::ScheduleHazardRecognizer::ShouldPreferAnother ( SUnit * )	inlinevirtual

◆ MaxLookAhead

unsigned llvm::ScheduleHazardRecognizer::MaxLookAhead = 0	protected

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

include/llvm/CodeGen/ScheduleHazardRecognizer.h
lib/CodeGen/ScheduleDAG.cpp