LLVM  9.0.0svn
Public Types | Public Member Functions | List of all members
llvm::GCNHazardRecognizer Class Referencefinal

#include "Target/AMDGPU/GCNHazardRecognizer.h"

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Public Types

typedef function_ref< bool(MachineInstr *)> IsHazardFn
 
- Public Types inherited from llvm::ScheduleHazardRecognizer
enum  HazardType { NoHazard, Hazard, NoopHazard }
 

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...
 
unsigned PreEmitNoopsCommon (MachineInstr *)
 
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

- 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 32 of file GCNHazardRecognizer.h.

Member Typedef Documentation

◆ IsHazardFn

Definition at line 34 of file GCNHazardRecognizer.h.

Constructor & Destructor Documentation

◆ GCNHazardRecognizer()

GCNHazardRecognizer::GCNHazardRecognizer ( const MachineFunction MF)

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 235 of file GCNHazardRecognizer.cpp.

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

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 85 of file GCNHazardRecognizer.h.

References AdvanceCycle(), EmitInstruction(), EmitNoop(), getHazardType(), PreEmitNoops(), PreEmitNoopsCommon(), 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 231 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(), and PreEmitNoopsCommon().

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 180 of file GCNHazardRecognizer.cpp.

References MI, PreEmitNoopsCommon(), and llvm::RISCVFenceField::W.

◆ PreEmitNoopsCommon()

unsigned GCNHazardRecognizer::PreEmitNoopsCommon ( MachineInstr MI)

◆ 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 269 of file GCNHazardRecognizer.cpp.

References llvm_unreachable.

Referenced by atIssueLimit().


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