#include "llvm/CodeGen/DetectDeadLanes.h"

Classes
struct	VRegInfo
	Contains a bitmask of which lanes of a given virtual register are defined and which ones are actually used. More...

Public Member Functions
	DeadLaneDetector (const MachineRegisterInfo MRI, const TargetRegisterInfo TRI)

void	computeSubRegisterLaneBitInfo ()
	Update the `DefinedLanes` and the `UsedLanes` for all virtual registers.

const VRegInfo &	getVRegInfo (unsigned RegIdx) const

bool	isDefinedByCopy (unsigned RegIdx) const

LaneBitmask	transferDefinedLanes (const MachineOperand &Def, unsigned OpNum, LaneBitmask DefinedLanes) const
	Given a mask `DefinedLanes` of lanes defined at operand `OpNum` of COPY-like instruction, determine which lanes are defined at the output operand `Def`.

LaneBitmask	transferUsedLanes (const MachineInstr &MI, LaneBitmask UsedLanes, const MachineOperand &MO) const
	Given a mask `UsedLanes` used from the output of instruction `MI` determine which lanes are used from operand `MO` of this instruction.

Detailed Description

Definition at line 42 of file DetectDeadLanes.h.

Constructor & Destructor Documentation

◆ DeadLaneDetector()

DeadLaneDetector::DeadLaneDetector	(	const MachineRegisterInfo *	MRI,
		const TargetRegisterInfo *	TRI
	)

Definition at line 41 of file DetectDeadLanes.cpp.

References MRI, and llvm::BitVector::resize().

Member Function Documentation

◆ computeSubRegisterLaneBitInfo()

void DeadLaneDetector::computeSubRegisterLaneBitInfo ( )

Update the DefinedLanes and the UsedLanes for all virtual registers.

Definition at line 453 of file DetectDeadLanes.cpp.

References llvm::dbgs(), llvm::MachineRegisterInfo::def_begin(), llvm::MachineRegisterInfo::getNumVirtRegs(), llvm::Register::index2VirtReg(), Info, LLVM_DEBUG, MI, llvm::PrintLaneMask(), llvm::printReg(), llvm::BitVector::reset(), and llvm::MachineRegisterInfo::use_nodbg_operands().

◆ getVRegInfo()

const VRegInfo & llvm::DeadLaneDetector::getVRegInfo ( unsigned RegIdx ) const

inline

Definition at line 57 of file DetectDeadLanes.h.

◆ isDefinedByCopy()

bool llvm::DeadLaneDetector::isDefinedByCopy ( unsigned RegIdx ) const

inline

Definition at line 61 of file DetectDeadLanes.h.

References llvm::BitVector::test().

◆ transferDefinedLanes()

LaneBitmask DeadLaneDetector::transferDefinedLanes	(	const MachineOperand &	Def,
		unsigned	OpNum,
		LaneBitmask	DefinedLanes
	)		const

Given a mask DefinedLanes of lanes defined at operand OpNum of COPY-like instruction, determine which lanes are defined at the output operand Def.

Definition at line 226 of file DetectDeadLanes.cpp.

References assert(), llvm::TargetRegisterInfo::composeSubRegIndexLaneMask(), llvm::MachineRegisterInfo::getMaxLaneMaskForVReg(), llvm::TargetRegisterInfo::getSubRegIndexLaneMask(), llvm_unreachable, MI, and llvm::TargetRegisterInfo::reverseComposeSubRegIndexLaneMask().