#include <LiveRegMatrix.h>

Inheritance diagram for llvm::LiveRegMatrix:

Collaboration diagram for llvm::LiveRegMatrix:

Public Types
enum	InterferenceKind { IK_Free = 0, IK_VirtReg, IK_RegUnit, IK_RegMask }

Public Member Functions
	LiveRegMatrix ()

void	invalidateVirtRegs ()

InterferenceKind	checkInterference (LiveInterval &VirtReg, unsigned PhysReg)

void	assign (LiveInterval &VirtReg, unsigned PhysReg)

void	unassign (LiveInterval &VirtReg)

bool	checkRegMaskInterference (LiveInterval &VirtReg, unsigned PhysReg=0)

bool	checkRegUnitInterference (LiveInterval &VirtReg, unsigned PhysReg)

LiveIntervalUnion::Query &	query (LiveInterval &VirtReg, unsigned RegUnit)

LiveIntervalUnion *	getLiveUnions ()

Public Member Functions inherited from llvm::FunctionPass
	FunctionPass (char &pid)

Pass *	createPrinterPass (raw_ostream &O, const std::string &Banner) const
	createPrinterPass - Get a function printer pass. More...

virtual void	assignPassManager (PMStack &PMS, PassManagerType T)

virtual PassManagerType	getPotentialPassManagerType () const
	Return what kind of Pass Manager can manage this pass. More...

Public Member Functions inherited from llvm::Pass
	Pass (PassKind K, char &pid)

virtual	~Pass ()

PassKind	getPassKind () const

virtual const char *	getPassName () const

AnalysisID	getPassID () const
	getPassID - Return the PassID number that corresponds to this pass. More...

virtual bool	doInitialization (Module &)

virtual bool	doFinalization (Module &)

virtual void	print (raw_ostream &O, const Module *M) const

void	dump () const

virtual void	preparePassManager (PMStack &)
	Check if available pass managers are suitable for this pass or not. More...

void	setResolver (AnalysisResolver *AR)

AnalysisResolver *	getResolver () const

virtual void *	getAdjustedAnalysisPointer (AnalysisID ID)

virtual ImmutablePass *	getAsImmutablePass ()

virtual PMDataManager *	getAsPMDataManager ()

virtual void	verifyAnalysis () const

virtual void	dumpPassStructure (unsigned Offset=0)

template<typename AnalysisType >
AnalysisType *	getAnalysisIfAvailable () const

bool	mustPreserveAnalysisID (char &AID) const

template<typename AnalysisType >
AnalysisType &	getAnalysis () const

template<typename AnalysisType >
AnalysisType &	getAnalysis (Function &F)

template<typename AnalysisType >
AnalysisType &	getAnalysisID (AnalysisID PI) const

template<typename AnalysisType >
AnalysisType &	getAnalysisID (AnalysisID PI, Function &F)

Static Public Attributes
static char	ID = 0

Additional Inherited Members
Static Public Member Functions inherited from llvm::Pass
static const PassInfo *	lookupPassInfo (const void *TI)

static const PassInfo *	lookupPassInfo (StringRef Arg)

static Pass *	createPass (AnalysisID ID)

Protected Member Functions inherited from llvm::MachineFunctionPass
	MachineFunctionPass (char &ID)

Detailed Description

Definition at line 40 of file LiveRegMatrix.h.

Member Enumeration Documentation

enum llvm::LiveRegMatrix::InterferenceKind

Enumerator
IK_Free	No interference, go ahead and assign.
IK_VirtReg	Virtual register interference. There are interfering virtual registers assigned to PhysReg or its aliases. This interference could be resolved by unassigning those other virtual registers.
IK_RegUnit	Register unit interference. A fixed live range is in the way, typically argument registers for a call. This can't be resolved by unassigning other virtual registers.
IK_RegMask	RegMask interference. The live range is crossing an instruction with a regmask operand that doesn't preserve PhysReg. This typically means VirtReg is live across a call, and PhysReg isn't call-preserved.

Definition at line 82 of file LiveRegMatrix.h.

Constructor & Destructor Documentation

Live Register false LiveRegMatrix::LiveRegMatrix ( )

Definition at line 39 of file LiveRegMatrix.cpp.

Member Function Documentation

void LiveRegMatrix::assign	(	LiveInterval &	VirtReg,
		unsigned	PhysReg
	)

Assign VirtReg to PhysReg. This will mark VirtReg's live range as occupied in the LiveRegMatrix and update VirtRegMap. The live range is expected to be available in PhysReg.

Definition at line 72 of file LiveRegMatrix.cpp.

References llvm::dbgs(), DEBUG, llvm::MCRegisterInfo::DiffListIterator::isValid(), llvm::LiveInterval::reg, and llvm::MachineRegisterInfo::setPhysRegUsed().

Referenced by llvm::RegAllocBase::allocatePhysRegs().

LiveRegMatrix::InterferenceKind LiveRegMatrix::checkInterference	(	LiveInterval &	VirtReg,
		unsigned	PhysReg
	)

Check for interference before assigning VirtReg to PhysReg. If this function returns IK_Free, it is legal to assign(VirtReg, PhysReg). When there is more than one kind of interference, the InterferenceKind with the highest enum value is returned.

Definition at line 138 of file LiveRegMatrix.cpp.

References llvm::LiveIntervalUnion::Query::checkInterference(), checkRegMaskInterference(), checkRegUnitInterference(), llvm::LiveRange::empty(), IK_Free, IK_RegMask, IK_RegUnit, IK_VirtReg, llvm::MCRegisterInfo::DiffListIterator::isValid(), and query().

bool LiveRegMatrix::checkRegMaskInterference	(	LiveInterval &	VirtReg,
		unsigned	PhysReg = `0`
	)

Check for regmask interference only. Return true if VirtReg crosses a regmask operand that clobbers PhysReg. If PhysReg is null, check if VirtReg crosses any regmask operands.

Definition at line 99 of file LiveRegMatrix.cpp.

References llvm::LiveIntervals::checkRegMaskInterference(), llvm::BitVector::clear(), llvm::BitVector::empty(), llvm::LiveInterval::reg, and llvm::BitVector::test().

Referenced by checkInterference().

bool LiveRegMatrix::checkRegUnitInterference	(	LiveInterval &	VirtReg,
		unsigned	PhysReg
	)

Check for regunit interference only. Return true if VirtReg overlaps a fixed assignment of one of PhysRegs's register units.

Definition at line 117 of file LiveRegMatrix.cpp.

References llvm::LiveRange::empty(), llvm::LiveIntervals::getRegUnit(), llvm::LiveIntervals::getSlotIndexes(), llvm::MCRegisterInfo::DiffListIterator::isValid(), llvm::LiveRange::overlaps(), and llvm::LiveInterval::reg.

Referenced by checkInterference().

LiveIntervalUnion* llvm::LiveRegMatrix::getLiveUnions ( )

inline

Directly access the live interval unions per regunit. This returns an array indexed by the regunit number.

Definition at line 143 of file LiveRegMatrix.h.

void llvm::LiveRegMatrix::invalidateVirtRegs ( )

inline

Invalidate cached interference queries after modifying virtual register live ranges. Interference checks may return stale information unless caches are invalidated.

Definition at line 80 of file LiveRegMatrix.h.

Referenced by llvm::RegAllocBase::allocatePhysRegs().

LiveIntervalUnion::Query & LiveRegMatrix::query	(	LiveInterval &	VirtReg,
		unsigned	RegUnit
	)

Query a line of the assigned virtual register matrix directly. Use MCRegUnitIterator to enumerate all regunits in the desired PhysReg. This returns a reference to an internal Query data structure that is only valid until the next query() call.

Definition at line 130 of file LiveRegMatrix.cpp.

References llvm::LiveIntervalUnion::Query::init().

Referenced by checkInterference().

void LiveRegMatrix::unassign ( LiveInterval & VirtReg )

Unassign VirtReg from its PhysReg. Assuming that VirtReg was previously assigned to a PhysReg, this undoes the assignment and updates VirtRegMap accordingly.

Definition at line 86 of file LiveRegMatrix.cpp.

References llvm::dbgs(), DEBUG, llvm::MCRegisterInfo::DiffListIterator::isValid(), and llvm::LiveInterval::reg.

Member Data Documentation

char LiveRegMatrix::ID = 0

static

Definition at line 66 of file LiveRegMatrix.h.

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

Public Types

Public Member Functions

Static Public Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation