LLVM  6.0.0svn
Public Member Functions | List of all members
llvm::ARMHazardRecognizer Class Reference

ARMHazardRecognizer handles special constraints that are not expressed in the scheduling itinerary. More...

#include "Target/ARM/ARMHazardRecognizer.h"

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Public Member Functions

 ARMHazardRecognizer (const InstrItineraryData *ItinData, const ScheduleDAG *DAG)
 
HazardType getHazardType (SUnit *SU, int Stalls) override
 getHazardType - Return the hazard type of emitting this node. More...
 
void Reset () override
 Reset - This callback is invoked when a new block of instructions is about to be schedule. More...
 
void EmitInstruction (SUnit *SU) override
 EmitInstruction - This callback is invoked when an instruction is emitted, to advance the hazard state. 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::ScoreboardHazardRecognizer
 ScoreboardHazardRecognizer (const InstrItineraryData *ItinData, const ScheduleDAG *DAG, const char *ParentDebugType="")
 
bool atIssueLimit () const override
 atIssueLimit - Return true if no more instructions may be issued in this cycle. More...
 
- Public Member Functions inherited from llvm::ScheduleHazardRecognizer
 ScheduleHazardRecognizer ()=default
 
virtual ~ScheduleHazardRecognizer ()
 
unsigned getMaxLookAhead () const
 
bool isEnabled () const
 
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. More...
 
virtual unsigned PreEmitNoops (SUnit *)
 PreEmitNoops - This callback is invoked prior to emitting an instruction. More...
 
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. More...
 
virtual bool ShouldPreferAnother (SUnit *)
 ShouldPreferAnother - This callback may be invoked if getHazardType returns NoHazard. More...
 
virtual void EmitNoop ()
 EmitNoop - This callback is invoked when a noop was added to the instruction stream. 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

ARMHazardRecognizer handles special constraints that are not expressed in the scheduling itinerary.

This is only used during postRA scheduling. The ARM preRA scheduler uses an unspecialized instance of the ScoreboardHazardRecognizer.

Definition at line 30 of file ARMHazardRecognizer.h.

Constructor & Destructor Documentation

◆ ARMHazardRecognizer()

llvm::ARMHazardRecognizer::ARMHazardRecognizer ( const InstrItineraryData ItinData,
const ScheduleDAG DAG 
)
inline

Member Function Documentation

◆ AdvanceCycle()

void ARMHazardRecognizer::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::ScoreboardHazardRecognizer.

Definition at line 92 of file ARMHazardRecognizer.cpp.

References llvm::ScoreboardHazardRecognizer::AdvanceCycle().

Referenced by ARMHazardRecognizer().

◆ EmitInstruction()

void ARMHazardRecognizer::EmitInstruction ( SUnit )
overridevirtual

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

Reimplemented from llvm::ScoreboardHazardRecognizer.

Definition at line 82 of file ARMHazardRecognizer.cpp.

References llvm::ScoreboardHazardRecognizer::EmitInstruction(), llvm::SUnit::getInstr(), llvm::MachineInstr::isDebugValue(), and MI.

Referenced by ARMHazardRecognizer().

◆ getHazardType()

ScheduleHazardRecognizer::HazardType ARMHazardRecognizer::getHazardType ( SUnit m,
int  Stalls 
)
overridevirtual

◆ RecedeCycle()

void ARMHazardRecognizer::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::ScoreboardHazardRecognizer.

Definition at line 99 of file ARMHazardRecognizer.cpp.

References llvm_unreachable.

Referenced by ARMHazardRecognizer().

◆ Reset()

void ARMHazardRecognizer::Reset ( )
overridevirtual

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

The hazard state should be set to an initialized state.

Reimplemented from llvm::ScoreboardHazardRecognizer.

Definition at line 76 of file ARMHazardRecognizer.cpp.

References llvm::ScoreboardHazardRecognizer::Reset().

Referenced by ARMHazardRecognizer().


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