llvm::AllocationOrder Class Reference

#include "CodeGen/AllocationOrder.h"

Public Member Functions
	AllocationOrder (unsigned VirtReg, const VirtRegMap &VRM, const RegisterClassInfo &RegClassInfo, const LiveRegMatrix *Matrix)
	Create a new AllocationOrder for VirtReg. More...
ArrayRef< MCPhysReg >	getOrder () const
	Get the allocation order without reordered hints. More...
unsigned	next (unsigned Limit=0)
	Return the next physical register in the allocation order, or 0. More...
unsigned	nextWithDups (unsigned Limit)
	As next(), but allow duplicates to be returned, and stop before the Limit'th register in the RegisterClassInfo allocation order. More...
void	rewind ()
	Start over from the beginning. More...
bool	isHint () const
	Return true if the last register returned from next() was a preferred register. More...
bool	isHint (unsigned PhysReg) const
	Return true if PhysReg is a preferred register. More...

Detailed Description

Definition at line 30 of file AllocationOrder.h.

Constructor & Destructor Documentation

AllocationOrder()

AllocationOrder::AllocationOrder	(	unsigned	VirtReg,
		const VirtRegMap &	VRM,
		const RegisterClassInfo &	RegClassInfo,
		const LiveRegMatrix *	Matrix
	)

Create a new AllocationOrder for VirtReg.

Parameters

VirtReg	Virtual register to allocate for.
VRM	Virtual register map for function.
RegClassInfo	Information about reserved and allocatable registers.

Definition at line 30 of file AllocationOrder.cpp.

References assert(), llvm::dbgs(), E, llvm::SmallVectorBase::empty(), llvm::VirtRegMap::getMachineFunction(), llvm::RegisterClassInfo::getOrder(), llvm::TargetRegisterInfo::getRegAllocationHints(), llvm::MachineRegisterInfo::getRegClass(), llvm::MachineFunction::getRegInfo(), llvm::VirtRegMap::getTargetRegInfo(), I, llvm::is_contained(), LLVM_DEBUG, llvm::printReg(), rewind(), llvm::SmallVectorBase::size(), and TRI.

Member Function Documentation

getOrder()

ArrayRef<MCPhysReg> llvm::AllocationOrder::getOrder ( ) const

inline

Get the allocation order without reordered hints.

Definition at line 50 of file AllocationOrder.h.

isHint() [1/2]

bool llvm::AllocationOrder::isHint ( ) const

inline

Return true if the last register returned from next() was a preferred register.

Definition at line 88 of file AllocationOrder.h.

Referenced by llvm::createGreedyRegisterAllocator().

isHint() [2/2]

bool llvm::AllocationOrder::isHint ( unsigned  PhysReg ) const

inline

Return true if PhysReg is a preferred register.

Definition at line 91 of file AllocationOrder.h.

References llvm::is_contained().

next()

unsigned llvm::AllocationOrder::next ( unsigned  Limit = 0 )

inline

Return the next physical register in the allocation order, or 0.

It is safe to call next() again after it returned 0, it will keep returning 0 until rewind() is called.

Definition at line 55 of file AllocationOrder.h.

References Reg, and llvm::ArrayRef< T >::size().

Referenced by llvm::createGreedyRegisterAllocator(), getNumAllocatableRegsForConstraints(), and hasTiedDef().

nextWithDups()

unsigned llvm::AllocationOrder::nextWithDups ( unsigned  Limit )

inline

As next(), but allow duplicates to be returned, and stop before the Limit'th register in the RegisterClassInfo allocation order.

This can produce more than Limit registers if there are hints.

Definition at line 74 of file AllocationOrder.h.

rewind()

void llvm::AllocationOrder::rewind ( )

inline

Start over from the beginning.

Definition at line 85 of file AllocationOrder.h.

Referenced by AllocationOrder(), llvm::createGreedyRegisterAllocator(), getNumAllocatableRegsForConstraints(), and hasTiedDef().

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

• lib/CodeGen/AllocationOrder.h
• lib/CodeGen/AllocationOrder.cpp