RegAllocBase provides the register allocation driver and interface that can be extended to add interesting heuristics. More...

#include "CodeGen/RegAllocBase.h"

Inheritance diagram for llvm::RegAllocBase:

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Static Public Attributes
static bool	VerifyEnabled = false
	VerifyEnabled - True when -verify-regalloc is given.

Protected Member Functions
	RegAllocBase (const RegAllocFilterFunc F=nullptr)

virtual	~RegAllocBase ()=default

void	init (VirtRegMap &vrm, LiveIntervals &lis, LiveRegMatrix &mat)

bool	shouldAllocateRegister (Register Reg)
	Get whether a given register should be allocated.

void	allocatePhysRegs ()

virtual void	postOptimization ()

virtual Spiller &	spiller ()=0

virtual void	enqueueImpl (const LiveInterval *LI)=0
	enqueue - Add VirtReg to the priority queue of unassigned registers.

void	enqueue (const LiveInterval *LI)
	enqueue - Add VirtReg to the priority queue of unassigned registers.

virtual const LiveInterval *	dequeue ()=0
	dequeue - Return the next unassigned register, or NULL.

virtual MCRegister	selectOrSplit (const LiveInterval &VirtReg, SmallVectorImpl< Register > &splitLVRs)=0

virtual void	aboutToRemoveInterval (const LiveInterval &LI)
	Method called when the allocator is about to remove a LiveInterval.

Protected Attributes
const TargetRegisterInfo *	TRI = nullptr

MachineRegisterInfo *	MRI = nullptr

VirtRegMap *	VRM = nullptr

LiveIntervals *	LIS = nullptr

LiveRegMatrix *	Matrix = nullptr

RegisterClassInfo	RegClassInfo

SmallPtrSet< MachineInstr *, 32 >	DeadRemats
	Inst which is a def of an original reg and whose defs are already all dead after remat is saved in DeadRemats.

Static Protected Attributes
static const char	TimerGroupName [] = "regalloc"

static const char	TimerGroupDescription [] = "Register Allocation"

Detailed Description

RegAllocBase provides the register allocation driver and interface that can be extended to add interesting heuristics.

Register allocators must override the selectOrSplit() method to implement live range splitting. They must also override enqueue/dequeue to provide an assignment order.

Definition at line 62 of file RegAllocBase.h.

Constructor & Destructor Documentation

◆ RegAllocBase()

llvm::RegAllocBase::RegAllocBase ( const RegAllocFilterFunc F = nullptr )

inlineprotected

Definition at line 84 of file RegAllocBase.h.

◆ ~RegAllocBase()

virtual llvm::RegAllocBase::~RegAllocBase ( )

protectedvirtualdefault

Member Function Documentation

◆ aboutToRemoveInterval()

virtual void llvm::RegAllocBase::aboutToRemoveInterval ( const LiveInterval & LI )

inlineprotectedvirtual

Method called when the allocator is about to remove a LiveInterval.

Reimplemented in llvm::RAGreedy.

Definition at line 131 of file RegAllocBase.h.

Referenced by allocatePhysRegs().

◆ allocatePhysRegs()

void RegAllocBase::allocatePhysRegs ( )

protected

Definition at line 85 of file RegAllocBase.cpp.

References aboutToRemoveInterval(), assert(), llvm::LiveRegMatrix::assign(), llvm::VirtRegMap::assignVirt2Phys(), llvm::dbgs(), dequeue(), llvm::LLVMContext::emitError(), llvm::ArrayRef< T >::empty(), llvm::LiveRange::empty(), enqueue(), llvm::ArrayRef< T >::front(), llvm::LiveIntervals::getInterval(), llvm::RegisterClassInfo::getOrder(), llvm::MachineRegisterInfo::getRegClass(), llvm::TargetRegisterInfo::getRegClassName(), llvm::LiveIntervals::hasInterval(), llvm::VirtRegMap::hasPhys(), llvm::LiveRegMatrix::invalidateVirtRegs(), llvm::Register::isVirtual(), LIS, LLVM_DEBUG, Matrix, MI, MRI, llvm::LiveInterval::reg(), llvm::MachineRegisterInfo::reg_instructions(), llvm::MachineRegisterInfo::reg_nodbg_empty(), RegClassInfo, llvm::LiveIntervals::removeInterval(), llvm::report_fatal_error(), selectOrSplit(), TRI, and VRM.

Referenced by llvm::RAGreedy::runOnMachineFunction().

◆ dequeue()

virtual const LiveInterval * llvm::RegAllocBase::dequeue ( )

protectedpure virtual

dequeue - Return the next unassigned register, or NULL.

Implemented in llvm::RAGreedy.

Referenced by allocatePhysRegs().

◆ enqueue()

void RegAllocBase::enqueue ( const LiveInterval * LI )

protected

enqueue - Add VirtReg to the priority queue of unassigned registers.

Definition at line 174 of file RegAllocBase.cpp.

References assert(), llvm::dbgs(), enqueueImpl(), llvm::VirtRegMap::hasPhys(), LLVM_DEBUG, llvm::printReg(), llvm::LiveInterval::reg(), shouldAllocateRegister(), TRI, and VRM.

Referenced by allocatePhysRegs().

◆ enqueueImpl()

virtual void llvm::RegAllocBase::enqueueImpl ( const LiveInterval * LI )

protectedpure virtual

enqueue - Add VirtReg to the priority queue of unassigned registers.

Implemented in llvm::RAGreedy.

Referenced by enqueue().

◆ init()

void RegAllocBase::init	(	VirtRegMap &	vrm,
		LiveIntervals &	lis,
		LiveRegMatrix &	mat
	)

protected

Definition at line 58 of file RegAllocBase.cpp.

References llvm::MachineRegisterInfo::freezeReservedRegs(), llvm::VirtRegMap::getMachineFunction(), llvm::VirtRegMap::getRegInfo(), llvm::VirtRegMap::getTargetRegInfo(), LIS, Matrix, MRI, RegClassInfo, llvm::RegisterClassInfo::runOnMachineFunction(), TRI, and VRM.

Referenced by llvm::RAGreedy::runOnMachineFunction().

◆ postOptimization()

void RegAllocBase::postOptimization ( )

protectedvirtual

Definition at line 165 of file RegAllocBase.cpp.

References DeadRemats, LIS, llvm::Spiller::postOptimization(), llvm::LiveIntervals::RemoveMachineInstrFromMaps(), and spiller().

Referenced by llvm::RAGreedy::runOnMachineFunction().

◆ selectOrSplit()

virtual MCRegister llvm::RegAllocBase::selectOrSplit	(	const LiveInterval &	VirtReg,
		SmallVectorImpl< Register > &	splitLVRs
	)

protectedpure virtual

Implemented in llvm::RAGreedy.

Referenced by allocatePhysRegs().

◆ shouldAllocateRegister()

bool llvm::RegAllocBase::shouldAllocateRegister ( Register Reg )

inlineprotected

Get whether a given register should be allocated.

Definition at line 93 of file RegAllocBase.h.

References MRI, Reg, and TRI.

Referenced by enqueue().

◆ spiller()

virtual Spiller & llvm::RegAllocBase::spiller ( )

protectedpure virtual

Implemented in llvm::RAGreedy.

Referenced by postOptimization().

Member Data Documentation

◆ DeadRemats

SmallPtrSet<MachineInstr *, 32> llvm::RegAllocBase::DeadRemats

protected

Inst which is a def of an original reg and whose defs are already all dead after remat is saved in DeadRemats.

The deletion of such inst is postponed till all the allocations are done, so its remat expr is always available for the remat of all the siblings of the original reg.

Definition at line 82 of file RegAllocBase.h.

Referenced by postOptimization().

◆ LIS

LiveIntervals* llvm::RegAllocBase::LIS = nullptr

protected

Definition at line 69 of file RegAllocBase.h.

Referenced by allocatePhysRegs(), init(), postOptimization(), and llvm::RAGreedy::runOnMachineFunction().

◆ Matrix

LiveRegMatrix* llvm::RegAllocBase::Matrix = nullptr

protected

Definition at line 70 of file RegAllocBase.h.

Referenced by allocatePhysRegs(), llvm::RegAllocEvictionAdvisor::canReassign(), init(), llvm::RegAllocEvictionAdvisor::isUnusedCalleeSavedReg(), and llvm::RAGreedy::runOnMachineFunction().

◆ MRI

MachineRegisterInfo* llvm::RegAllocBase::MRI = nullptr

protected

Definition at line 67 of file RegAllocBase.h.

Referenced by allocatePhysRegs(), getInstReadLaneMask(), llvm::RegAllocEvictionAdvisor::getOrderLimit(), hasTiedDef(), init(), readsLaneSubset(), and shouldAllocateRegister().

◆ RegClassInfo

RegisterClassInfo llvm::RegAllocBase::RegClassInfo

protected

Definition at line 71 of file RegAllocBase.h.

Referenced by allocatePhysRegs(), llvm::RegAllocEvictionAdvisor::canAllocatePhysReg(), llvm::RegAllocEvictionAdvisor::canReassign(), llvm::RegAllocEvictionAdvisor::getOrderLimit(), init(), and llvm::RegAllocEvictionAdvisor::isUnusedCalleeSavedReg().

◆ TimerGroupDescription

const char RegAllocBase::TimerGroupDescription = "Register Allocation"

staticprotected

Definition at line 128 of file RegAllocBase.h.

◆ TimerGroupName

const char RegAllocBase::TimerGroupName = "regalloc"

staticprotected

Definition at line 127 of file RegAllocBase.h.

◆ TRI

const TargetRegisterInfo* llvm::RegAllocBase::TRI = nullptr

protected

Definition at line 66 of file RegAllocBase.h.

Referenced by allocatePhysRegs(), assignedRegPartiallyOverlaps(), llvm::RegAllocEvictionAdvisor::canAllocatePhysReg(), llvm::RegAllocEvictionAdvisor::canReassign(), enqueue(), getInstReadLaneMask(), getNumAllocatableRegsForConstraints(), llvm::RegAllocEvictionAdvisor::getOrderLimit(), init(), readsLaneSubset(), llvm::RAGreedy::runOnMachineFunction(), and shouldAllocateRegister().

◆ VerifyEnabled

bool RegAllocBase::VerifyEnabled = false

static

VerifyEnabled - True when -verify-regalloc is given.

Definition at line 135 of file RegAllocBase.h.

Referenced by llvm::RAGreedy::runOnMachineFunction().

◆ VRM

VirtRegMap* llvm::RegAllocBase::VRM = nullptr

protected

Definition at line 68 of file RegAllocBase.h.

Referenced by allocatePhysRegs(), assignedRegPartiallyOverlaps(), llvm::RegAllocEvictionAdvisor::canReassign(), enqueue(), init(), and llvm::RAGreedy::runOnMachineFunction().

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

lib/CodeGen/RegAllocBase.h
lib/CodeGen/RegAllocBase.cpp

Static Public Attributes

Protected Member Functions

Protected Attributes

Static Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ RegAllocBase()

◆ ~RegAllocBase()

Member Function Documentation

◆ aboutToRemoveInterval()

◆ allocatePhysRegs()

◆ dequeue()

◆ enqueue()

◆ enqueueImpl()

◆ init()

◆ postOptimization()

◆ selectOrSplit()

◆ shouldAllocateRegister()

◆ spiller()

Member Data Documentation

◆ DeadRemats

◆ LIS

◆ Matrix

◆ MRI

◆ RegClassInfo

◆ TimerGroupDescription

◆ TimerGroupName

◆ TRI

◆ VerifyEnabled

◆ VRM