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

#include "CodeGen/RegAllocBase.h"

Collaboration diagram for llvm::RegAllocBase:

[legend]

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

Protected Member Functions
	RegAllocBase ()=default

virtual	~RegAllocBase ()=default

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

void	allocatePhysRegs ()

virtual void	postOptimization ()

virtual Spiller &	spiller ()=0

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

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

virtual unsigned	selectOrSplit (LiveInterval &VirtReg, SmallVectorImpl< unsigned > &splitLVRs)=0

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

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. More...

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 61 of file RegAllocBase.h.

Constructor & Destructor Documentation

◆ RegAllocBase()

llvm::RegAllocBase::RegAllocBase ( )

protecteddefault

◆ ~RegAllocBase()

virtual llvm::RegAllocBase::~RegAllocBase ( )

protectedvirtualdefault

Member Function Documentation

◆ aboutToRemoveInterval()

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

inlineprotectedvirtual

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

Definition at line 113 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(), E, llvm::MachineInstr::emitError(), enqueue(), llvm::LiveIntervals::getInterval(), llvm::RegisterClassInfo::getOrder(), llvm::MachineRegisterInfo::getRegClass(), llvm::TargetRegisterInfo::getRegClassName(), llvm::LiveIntervals::hasInterval(), llvm::VirtRegMap::hasPhys(), I, llvm::LiveRegMatrix::invalidateVirtRegs(), llvm::MachineInstr::isInlineAsm(), llvm::TargetRegisterInfo::isVirtualRegister(), LIS, LLVM_DEBUG, Matrix, MI, MRI, Reg, llvm::MachineRegisterInfo::reg_instr_begin(), llvm::MachineRegisterInfo::reg_instr_end(), llvm::MachineRegisterInfo::reg_nodbg_empty(), RegClassInfo, llvm::LiveIntervals::removeInterval(), llvm::report_fatal_error(), selectOrSplit(), TRI, and VRM.

◆ dequeue()

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

protectedpure virtual

dequeue - Return the next unassigned register, or NULL.

Referenced by allocatePhysRegs().

◆ enqueue()

virtual void llvm::RegAllocBase::enqueue ( LiveInterval * LI )

protectedpure virtual

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

Referenced by allocatePhysRegs(), and init().

◆ init()

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

protected

◆ postOptimization()

void RegAllocBase::postOptimization ( )

protectedvirtual

Definition at line 162 of file RegAllocBase.cpp.

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

◆ selectOrSplit()

virtual unsigned llvm::RegAllocBase::selectOrSplit	(	LiveInterval &	VirtReg,
		SmallVectorImpl< unsigned > &	splitLVRs
	)

protectedpure virtual

Referenced by allocatePhysRegs().

◆ spiller()

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

protectedpure virtual

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 76 of file RegAllocBase.h.

Referenced by postOptimization().

◆ LIS

LiveIntervals* llvm::RegAllocBase::LIS = nullptr

protected

Definition at line 68 of file RegAllocBase.h.

Referenced by allocatePhysRegs(), init(), and postOptimization().

◆ Matrix

LiveRegMatrix* llvm::RegAllocBase::Matrix = nullptr

protected

Definition at line 69 of file RegAllocBase.h.

Referenced by allocatePhysRegs(), and init().

◆ MRI

MachineRegisterInfo* llvm::RegAllocBase::MRI = nullptr

protected

Definition at line 66 of file RegAllocBase.h.

Referenced by allocatePhysRegs(), and init().

◆ RegClassInfo

RegisterClassInfo llvm::RegAllocBase::RegClassInfo

protected

Definition at line 70 of file RegAllocBase.h.

Referenced by allocatePhysRegs(), and init().

◆ TimerGroupDescription

const char RegAllocBase::TimerGroupDescription = "Register Allocation"

staticprotected

Definition at line 110 of file RegAllocBase.h.

Referenced by init().

◆ TimerGroupName

const char RegAllocBase::TimerGroupName = "regalloc"

staticprotected

Definition at line 109 of file RegAllocBase.h.

Referenced by init().

◆ TRI

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

protected

Definition at line 65 of file RegAllocBase.h.

Referenced by allocatePhysRegs(), and init().

◆ VerifyEnabled

bool RegAllocBase::VerifyEnabled = false

static

VerifyEnabled - True when -verify-regalloc is given.

Definition at line 117 of file RegAllocBase.h.

◆ VRM

VirtRegMap* llvm::RegAllocBase::VRM = nullptr

protected

Definition at line 67 of file RegAllocBase.h.

Referenced by allocatePhysRegs(), and init().

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()

◆ init()

◆ postOptimization()

◆ selectOrSplit()

◆ spiller()

Member Data Documentation

◆ DeadRemats

◆ LIS

◆ Matrix

◆ MRI

◆ RegClassInfo

◆ TimerGroupDescription

◆ TimerGroupName

◆ TRI

◆ VerifyEnabled

◆ VRM