#include <RegisterScavenging.h>

Classes
struct	ScavengedInfo
	Information on scavenged registers (held in a spill slot).
Public Member Functions
	RegScavenger ()
void	enterBasicBlock (MachineBasicBlock *mbb)
void	initRegState ()
void	forward ()
	forward - Move the internal MBB iterator and update register states.
void	forward (MachineBasicBlock::iterator I)
void	unprocess ()
void	unprocess (MachineBasicBlock::iterator I)
	Unprocess instructions until you reach the provided iterator.
void	skipTo (MachineBasicBlock::iterator I)
	skipTo - Move the internal MBB iterator but do not update register states.
MachineBasicBlock::iterator	getCurrentPosition () const
bool	isRegUsed (unsigned Reg, bool includeReserved=true) const
	isRegUsed - return if a specific register is currently used.
BitVector	getRegsAvailable (const TargetRegisterClass *RC)
unsigned	FindUnusedReg (const TargetRegisterClass *RegClass) const
void	addScavengingFrameIndex (int FI)
	Add a scavenging frame index.
bool	isScavengingFrameIndex (int FI) const
	Query whether a frame index is a scavenging frame index.
void	getScavengingFrameIndices (SmallVectorImpl< int > &A) const
	Get an array of scavenging frame indices.
unsigned	scavengeRegister (const TargetRegisterClass *RegClass, MachineBasicBlock::iterator I, int SPAdj)
unsigned	scavengeRegister (const TargetRegisterClass *RegClass, int SPAdj)
void	setRegUsed (unsigned Reg)
	setUsed - Set the register units of this register as used.

Detailed Description

Definition at line 31 of file RegisterScavenging.h.

Constructor & Destructor Documentation

llvm::RegScavenger::RegScavenger ( ) [inline]

Definition at line 72 of file RegisterScavenging.h.

Member Function Documentation

void llvm::RegScavenger::addScavengingFrameIndex ( int FI ) [inline]

Add a scavenging frame index.

Definition at line 125 of file RegisterScavenging.h.

References llvm::SmallVectorTemplateBase< T, isPodLike >::push_back().

Referenced by llvm::PPCFrameLowering::addScavengingSpillSlot(), llvm::MipsSEFrameLowering::processFunctionBeforeCalleeSavedScan(), llvm::ARMFrameLowering::processFunctionBeforeCalleeSavedScan(), llvm::AArch64FrameLowering::processFunctionBeforeCalleeSavedScan(), llvm::SystemZFrameLowering::processFunctionBeforeFrameFinalized(), and llvm::XCoreFrameLowering::processFunctionBeforeFrameFinalized().

void RegScavenger::enterBasicBlock ( MachineBasicBlock * mbb )

enterBasicBlock - Start tracking liveness from the begin of the specific basic block.

Definition at line 64 of file RegisterScavenging.cpp.

References llvm::TargetSubtargetInfo::getInstrInfo(), llvm::MCRegisterInfo::getNumRegUnits(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getRegInfo(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::TargetMachine::getSubtargetImpl(), llvm::MachineFunction::getTarget(), initRegState(), llvm::BitVector::resize(), llvm::SystemZISD::TM, and llvm::MachineRegisterInfo::tracksLiveness().

Referenced by llvm::Mips16InstrInfo::loadImmediate().

unsigned RegScavenger::FindUnusedReg ( const TargetRegisterClass * RegClass ) const

FindUnusedReg - Find a unused register of the specified register class. Return 0 if none is found.

Definition at line 266 of file RegisterScavenging.cpp.

References llvm::TargetRegisterClass::begin(), llvm::dbgs(), DEBUG, llvm::TargetRegisterClass::end(), llvm::MCRegisterInfo::getName(), I, and isRegUsed().

void RegScavenger::forward ( )

forward - Move the internal MBB iterator and update register states.

Definition at line 171 of file RegisterScavenging.cpp.

References llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::MachineBasicBlock::begin(), llvm::SmallVectorTemplateCommon< T, typename >::end(), llvm::MachineBasicBlock::end(), llvm::MachineBasicBlock::getParent(), llvm::MachineOperand::getReg(), I, llvm::ARM_PROC::IE, llvm::MachineOperand::isDef(), llvm::MachineOperand::isReg(), isRegUsed(), llvm::MachineOperand::isUndef(), llvm::MachineOperand::isUse(), llvm::MCRegisterInfo::DiffListIterator::isValid(), llvm::TargetRegisterInfo::isVirtualRegister(), llvm_unreachable, and llvm::MachineFunction::verify().

Referenced by forward(), and llvm::Mips16InstrInfo::loadImmediate().

void llvm::RegScavenger::forward ( MachineBasicBlock::iterator I ) [inline]

forward - Move the internal MBB iterator and update register states until it has processed the specific iterator.

Definition at line 88 of file RegisterScavenging.h.

References llvm::MachineBasicBlock::begin(), forward(), and I.

MachineBasicBlock::iterator llvm::RegScavenger::getCurrentPosition ( ) const [inline]

Definition at line 109 of file RegisterScavenging.h.

BitVector RegScavenger::getRegsAvailable ( const TargetRegisterClass * RC )

getRegsAvailable - Return all available registers in the register class in Mask.

Definition at line 279 of file RegisterScavenging.cpp.

References llvm::TargetRegisterClass::begin(), llvm::TargetRegisterClass::end(), llvm::MCRegisterInfo::getNumRegs(), I, isRegUsed(), and llvm::BitVector::set().

Referenced by llvm::Mips16InstrInfo::loadImmediate(), and scavengeRegister().

void llvm::RegScavenger::getScavengingFrameIndices ( SmallVectorImpl< int > & A ) const [inline]

Get an array of scavenging frame indices.

Definition at line 140 of file RegisterScavenging.h.

References llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::SmallVectorTemplateCommon< T, typename >::end(), I, llvm::ARM_PROC::IE, and llvm::SmallVectorTemplateBase< T, isPodLike >::push_back().

void RegScavenger::initRegState ( )

initRegState - allow resetting register state info for multiple passes over/within the same function.

Definition at line 40 of file RegisterScavenging.cpp.

References llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::SmallVectorTemplateCommon< T, typename >::end(), llvm::BitVector::find_first(), llvm::BitVector::find_next(), llvm::MachineFunction::getFrameInfo(), llvm::MachineBasicBlock::getParent(), llvm::MachineFrameInfo::getPristineRegs(), I, llvm::ARM_PROC::IE, llvm::MachineBasicBlock::livein_begin(), llvm::MachineBasicBlock::livein_end(), llvm::BitVector::set(), and setRegUsed().

Referenced by enterBasicBlock().

bool RegScavenger::isRegUsed	(	unsigned	Reg,
		bool	includeReserved = `true`
	)		const

isRegUsed - return if a specific register is currently used.

Definition at line 257 of file RegisterScavenging.cpp.

References llvm::MCRegisterInfo::DiffListIterator::isValid(), and llvm::BitVector::test().

Referenced by FindUnusedReg(), forward(), getRegsAvailable(), and scavengeRegister().

bool llvm::RegScavenger::isScavengingFrameIndex ( int FI ) const [inline]

Query whether a frame index is a scavenging frame index.

Definition at line 130 of file RegisterScavenging.h.

References llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::SmallVectorTemplateCommon< T, typename >::end(), I, and llvm::ARM_PROC::IE.

Referenced by llvm::Thumb1RegisterInfo::eliminateFrameIndex(), llvm::AArch64RegisterInfo::eliminateFrameIndex(), and llvm::ARMBaseRegisterInfo::eliminateFrameIndex().

unsigned RegScavenger::scavengeRegister	(	const TargetRegisterClass *	RegClass,
		MachineBasicBlock::iterator	I,
		int	SPAdj
	)

scavengeRegister - Make a register of the specific register class available and do the appropriate bookkeeping. SPAdj is the stack adjustment due to call frame, it's passed along to eliminateFrameIndex(). Returns the scavenged register.

Definition at line 369 of file RegisterScavenging.cpp.

References llvm::BitVector::any(), llvm::dbgs(), DEBUG, llvm::TargetRegisterInfo::eliminateFrameIndex(), llvm::ISD::FrameIndex, llvm::TargetRegisterInfo::getAllocatableSet(), getFrameIndexOperandNum(), llvm::MCRegisterInfo::getName(), llvm::MachineOperand::getReg(), getRegsAvailable(), llvm::MachineOperand::isReg(), isRegUsed(), llvm::MachineOperand::isUndef(), llvm::MachineOperand::isUse(), llvm::TargetRegisterInfo::isVirtualRegister(), llvm::TargetInstrInfo::loadRegFromStackSlot(), llvm::SmallVectorTemplateBase< T, isPodLike >::push_back(), llvm::BitVector::reset(), llvm::TargetRegisterInfo::saveScavengerRegister(), llvm::SmallVectorTemplateCommon< T, typename >::size(), and llvm::TargetInstrInfo::storeRegToStackSlot().