llvm::RegisterOperands Class Reference

List of registers defined and used by a machine instruction. More...

#include "llvm/CodeGen/RegisterPressure.h"

Public Member Functions
void	collect (const MachineInstr &MI, const TargetRegisterInfo &TRI, const MachineRegisterInfo &MRI, bool TrackLaneMasks, bool IgnoreDead)
	Analyze the given instruction MI and fill in the Uses, Defs and DeadDefs list based on the MachineOperand flags.
void	detectDeadDefs (const MachineInstr &MI, const LiveIntervals &LIS)
	Use liveness information to find dead defs not marked with a dead flag and move them to the DeadDefs vector.
void	adjustLaneLiveness (const LiveIntervals &LIS, const MachineRegisterInfo &MRI, SlotIndex Pos, MachineInstr *AddFlagsMI=nullptr)
	Use liveness information to find out which uses/defs are partially undefined/dead and adjust the RegisterMaskPairs accordingly.

Public Attributes
SmallVector< RegisterMaskPair, 8 >	Uses
	List of virtual registers and register units read by the instruction.
SmallVector< RegisterMaskPair, 8 >	Defs
	List of virtual registers and register units defined by the instruction which are not dead.
SmallVector< RegisterMaskPair, 8 >	DeadDefs
	List of virtual registers and register units defined by the instruction but dead.

Detailed Description

List of registers defined and used by a machine instruction.

Definition at line 166 of file RegisterPressure.h.

Member Function Documentation

adjustLaneLiveness()

void RegisterOperands::adjustLaneLiveness	(	const LiveIntervals &	LIS,
		const MachineRegisterInfo &	MRI,
		SlotIndex	Pos,
		MachineInstr *	AddFlagsMI = nullptr
	)

Use liveness information to find out which uses/defs are partially undefined/dead and adjust the RegisterMaskPairs accordingly.

If AddFlagsMI is given then missing read-undef and dead flags will be added to the instruction.

Definition at line 598 of file RegisterPressure.cpp.

References DeadDefs, Defs, llvm::SlotIndex::getBaseIndex(), llvm::SlotIndex::getDeadSlot(), getLiveLanesAt(), I, llvm::Register::isVirtual(), MRI, llvm::LaneBitmask::none(), P, llvm::MachineInstr::setRegisterDefReadUndef(), and Uses.

Referenced by llvm::RegPressureTracker::advance(), llvm::ScheduleDAGInstrs::buildSchedGraph(), llvm::RegPressureTracker::bumpDownwardPressure(), llvm::RegPressureTracker::bumpUpwardPressure(), llvm::RegPressureTracker::recede(), llvm::GCNSchedStage::revertScheduling(), llvm::ScheduleDAGMILive::scheduleMI(), and llvm::GCNIterativeScheduler::scheduleRegion().

collect()

void RegisterOperands::collect	(	const MachineInstr &	MI,
		const TargetRegisterInfo &	TRI,
		const MachineRegisterInfo &	MRI,
		bool	TrackLaneMasks,
		bool	IgnoreDead
	)

Analyze the given instruction MI and fill in the Uses, Defs and DeadDefs list based on the MachineOperand flags.

Definition at line 567 of file RegisterPressure.cpp.

References Collector, MI, MRI, and TRI.

Referenced by llvm::RegPressureTracker::advance(), llvm::ScheduleDAGInstrs::buildSchedGraph(), llvm::RegPressureTracker::bumpDownwardPressure(), llvm::RegPressureTracker::bumpUpwardPressure(), llvm::RegPressureTracker::recede(), llvm::GCNSchedStage::revertScheduling(), llvm::ScheduleDAGMILive::scheduleMI(), llvm::GCNIterativeScheduler::scheduleRegion(), and llvm::PPCInstrInfo::shouldReduceRegisterPressure().

detectDeadDefs()

void RegisterOperands::detectDeadDefs	(	const MachineInstr &	MI,
		const LiveIntervals &	LIS
	)

Use liveness information to find dead defs not marked with a dead flag and move them to the DeadDefs vector.

Definition at line 578 of file RegisterPressure.cpp.

References DeadDefs, Defs, llvm::LiveIntervals::getInstructionIndex(), getLiveRange(), llvm::LiveQueryResult::isDeadDef(), MI, llvm::LiveRange::Query(), and Reg.

Referenced by llvm::RegPressureTracker::bumpUpwardPressure(), llvm::RegPressureTracker::recede(), llvm::GCNSchedStage::revertScheduling(), and llvm::ScheduleDAGMILive::scheduleMI().

Member Data Documentation

DeadDefs

SmallVector<RegisterMaskPair, 8> llvm::RegisterOperands::DeadDefs

List of virtual registers and register units defined by the instruction but dead.

Definition at line 175 of file RegisterPressure.h.

Referenced by adjustLaneLiveness(), llvm::RegPressureTracker::advance(), llvm::RegPressureTracker::bumpDownwardPressure(), llvm::RegPressureTracker::bumpUpwardPressure(), detectDeadDefs(), and llvm::RegPressureTracker::recede().

Defs

SmallVector<RegisterMaskPair, 8> llvm::RegisterOperands::Defs

List of virtual registers and register units defined by the instruction which are not dead.

Definition at line 172 of file RegisterPressure.h.

Referenced by llvm::PressureDiffs::addInstruction(), adjustLaneLiveness(), llvm::RegPressureTracker::advance(), llvm::RegPressureTracker::bumpDownwardPressure(), llvm::RegPressureTracker::bumpUpwardPressure(), detectDeadDefs(), and llvm::RegPressureTracker::recede().

Uses

SmallVector<RegisterMaskPair, 8> llvm::RegisterOperands::Uses

List of virtual registers and register units read by the instruction.

Definition at line 169 of file RegisterPressure.h.

Referenced by llvm::PressureDiffs::addInstruction(), adjustLaneLiveness(), llvm::RegPressureTracker::advance(), llvm::RegPressureTracker::bumpDownwardPressure(), llvm::RegPressureTracker::bumpUpwardPressure(), and llvm::RegPressureTracker::recede().

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

• include/llvm/CodeGen/RegisterPressure.h
• lib/CodeGen/RegisterPressure.cpp