Register rename map for a single class of registers (e.g., integer or floating point). More...

#include <rename_map.hh>

Public Types
typedef TheISA::RegIndex	RegIndex

typedef std::pair < PhysRegIndex, PhysRegIndex >	RenameInfo
	Pair of a physical register and a physical register. More...

Public Member Functions
	SimpleRenameMap ()

	~SimpleRenameMap ()

void	init (unsigned size, SimpleFreeList *_freeList, RegIndex _zeroReg)
	Because we have an array of rename maps (one per thread) in the CPU, it's awkward to initialize this object via the constructor. More...

RenameInfo	rename (RegIndex arch_reg)
	Tell rename map to get a new free physical register to remap the specified architectural register. More...

PhysRegIndex	lookup (RegIndex arch_reg) const
	Look up the physical register mapped to an architectural register. More...

void	setEntry (RegIndex arch_reg, PhysRegIndex phys_reg)
	Update rename map with a specific mapping. More...

unsigned	numFreeEntries () const
	Return the number of free entries on the associated free list. More...

Private Attributes
std::vector< PhysRegIndex >	map
	The acutal arch-to-phys register map. More...

SimpleFreeList *	freeList
	Pointer to the free list from which new physical registers should be allocated in rename() More...

RegIndex	zeroReg
	The architectural index of the zero register. More...

Detailed Description

Register rename map for a single class of registers (e.g., integer or floating point).

Because the register class is implicitly determined by the rename map instance being accessed, all architectural register index parameters and values in this class are relative (e.g., fp2 is just index 2).

Definition at line 69 of file rename_map.hh.

Member Typedef Documentation

typedef TheISA::RegIndex SimpleRenameMap::RegIndex

Definition at line 73 of file rename_map.hh.

typedef std::pair<PhysRegIndex, PhysRegIndex> SimpleRenameMap::RenameInfo

Pair of a physical register and a physical register.

Used to return the physical register that a logical register has been renamed to, and the previous physical register that the same logical register was previously mapped to.

Definition at line 114 of file rename_map.hh.

Constructor & Destructor Documentation

SimpleRenameMap::SimpleRenameMap ( )

Definition at line 42 of file rename_map.cc.

SimpleRenameMap::~SimpleRenameMap ( )

inline

Definition at line 99 of file rename_map.hh.

Member Function Documentation

void SimpleRenameMap::init	(	unsigned	size,
		SimpleFreeList *	_freeList,
		RegIndex	_zeroReg
	)

Because we have an array of rename maps (one per thread) in the CPU, it's awkward to initialize this object via the constructor.

Instead, this method is used for initialization.

Definition at line 49 of file rename_map.cc.

References freeList, map, and zeroReg.

Referenced by UnifiedRenameMap::init().

PhysRegIndex SimpleRenameMap::lookup ( RegIndex arch_reg ) const

inline

Look up the physical register mapped to an architectural register.

Parameters

arch_reg The architectural register to look up.

Returns: The physical register it is currently mapped to.

Definition at line 130 of file rename_map.hh.

References map.

Referenced by UnifiedRenameMap::lookupCC(), UnifiedRenameMap::lookupFloat(), and UnifiedRenameMap::lookupInt().

unsigned SimpleRenameMap::numFreeEntries ( ) const

inline

Return the number of free entries on the associated free list.

Definition at line 148 of file rename_map.hh.

References freeList, and SimpleFreeList::numFreeRegs().

Referenced by UnifiedRenameMap::canRename(), and UnifiedRenameMap::numFreeEntries().

SimpleRenameMap::RenameInfo SimpleRenameMap::rename ( RegIndex arch_reg )

Tell rename map to get a new free physical register to remap the specified architectural register.

Parameters

arch_reg The architectural register to remap.

Returns: A RenameInfo pair indicating both the new and previous physical registers.

Definition at line 61 of file rename_map.cc.

References DPRINTF, freeList, SimpleFreeList::getReg(), map, and zeroReg.

Referenced by UnifiedRenameMap::renameCC(), UnifiedRenameMap::renameFloat(), and UnifiedRenameMap::renameInt().

void SimpleRenameMap::setEntry	(	RegIndex	arch_reg,
		PhysRegIndex	phys_reg
	)

inline

Update rename map with a specific mapping.

Generally used to roll back to old mappings on a squash.

Parameters

arch_reg	The architectural register to remap.
phys_reg	The physical register to remap it to.

Definition at line 142 of file rename_map.hh.

References map.

Referenced by UnifiedRenameMap::setCCEntry(), UnifiedRenameMap::setFloatEntry(), and UnifiedRenameMap::setIntEntry().

Member Data Documentation

SimpleFreeList* SimpleRenameMap::freeList

private

Pointer to the free list from which new physical registers should be allocated in rename()

Definition at line 84 of file rename_map.hh.

Referenced by init(), numFreeEntries(), and rename().

std::vector<PhysRegIndex> SimpleRenameMap::map

private

The acutal arch-to-phys register map.

Definition at line 78 of file rename_map.hh.

Referenced by init(), lookup(), rename(), and setEntry().

RegIndex SimpleRenameMap::zeroReg

private

The architectural index of the zero register.

This register is mapped but read-only, so we ignore attempts to rename it via the rename() method. If there is no such register for this map table, it should be set to an invalid index so that it never matches.

Definition at line 93 of file rename_map.hh.

Referenced by init(), and rename().

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

cpu/o3/rename_map.hh
cpu/o3/rename_map.cc

Public Types

Public Member Functions

Private Attributes

Detailed Description

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation