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

#include <rename_map.hh>

Public Types
using	iterator = Arch2PhysMap::iterator

using	const_iterator = Arch2PhysMap::const_iterator

typedef std::pair< PhysRegIdPtr, PhysRegIdPtr >	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 (const RegId &arch_reg)
	Tell rename map to get a new free physical register to remap the specified architectural register. More...

PhysRegIdPtr	lookup (const RegId &arch_reg) const
	Look up the physical register mapped to an architectural register. More...

void	setEntry (const RegId &arch_reg, PhysRegIdPtr 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...


iterator	begin ()
	Forward begin/cbegin to the map. More...

const_iterator	begin () const

const_iterator	cbegin () const


iterator	end ()
	Forward end/cend to the map. More...

const_iterator	end () const

const_iterator	cend () const

Private Types
using	Arch2PhysMap = std::vector< PhysRegIdPtr >

Private Attributes
Arch2PhysMap	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...

RegId	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 63 of file rename_map.hh.

Member Typedef Documentation

◆ Arch2PhysMap

using SimpleRenameMap::Arch2PhysMap = std::vector<PhysRegIdPtr>

private

Definition at line 66 of file rename_map.hh.

◆ const_iterator

using SimpleRenameMap::const_iterator = Arch2PhysMap::const_iterator

Definition at line 71 of file rename_map.hh.

◆ iterator

using SimpleRenameMap::iterator = Arch2PhysMap::iterator

Definition at line 70 of file rename_map.hh.

◆ RenameInfo

typedef std::pair<PhysRegIdPtr, PhysRegIdPtr> 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 108 of file rename_map.hh.

Constructor & Destructor Documentation

◆ SimpleRenameMap()

SimpleRenameMap::SimpleRenameMap ( )

Definition at line 53 of file rename_map.cc.

◆ ~SimpleRenameMap()

SimpleRenameMap::~SimpleRenameMap ( )

inline

Definition at line 93 of file rename_map.hh.

Member Function Documentation

◆ begin() [1/2]

iterator SimpleRenameMap::begin ( )

inline

Forward begin/cbegin to the map.

Definition at line 149 of file rename_map.hh.

References map.

◆ begin() [2/2]

const_iterator SimpleRenameMap::begin ( ) const

inline

Definition at line 150 of file rename_map.hh.

References map.

◆ cbegin()

const_iterator SimpleRenameMap::cbegin ( ) const

inline

Definition at line 151 of file rename_map.hh.

References map.

◆ cend()

const_iterator SimpleRenameMap::cend ( ) const

inline

Definition at line 158 of file rename_map.hh.

References map.

◆ end() [1/2]

iterator SimpleRenameMap::end ( )

inline

Forward end/cend to the map.

Definition at line 156 of file rename_map.hh.

References map.

◆ end() [2/2]

const_iterator SimpleRenameMap::end ( ) const

inline

Definition at line 157 of file rename_map.hh.

References map.

◆ init()

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 60 of file rename_map.cc.

References freeList, IntRegClass, map, and zeroReg.

Referenced by UnifiedRenameMap::init().

◆ lookup()

PhysRegIdPtr SimpleRenameMap::lookup ( const RegId & 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 125 of file rename_map.hh.

References RegId::flatIndex(), and map.

Referenced by UnifiedRenameMap::lookup(), and UnifiedRenameMap::switchMode().

◆ numFreeEntries()

unsigned SimpleRenameMap::numFreeEntries ( ) const

inline

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

Definition at line 145 of file rename_map.hh.

References freeList, and SimpleFreeList::numFreeRegs().

Referenced by UnifiedRenameMap::canRename(), UnifiedRenameMap::numFreeCCEntries(), UnifiedRenameMap::numFreeEntries(), UnifiedRenameMap::numFreeFloatEntries(), UnifiedRenameMap::numFreeIntEntries(), UnifiedRenameMap::numFreePredEntries(), and UnifiedRenameMap::numFreeVecEntries().

◆ rename()

SimpleRenameMap::RenameInfo SimpleRenameMap::rename ( const RegId & 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 72 of file rename_map.cc.

References PhysRegId::decrNumPinnedWrites(), DPRINTF, RegId::flatIndex(), PhysRegId::flatIndex(), freeList, RegId::getNumPinnedWrites(), PhysRegId::getNumPinnedWrites(), SimpleFreeList::getReg(), PhysRegId::isZeroReg(), map, PhysRegId::setNumPinnedWrites(), PhysRegId::setNumPinnedWritesToComplete(), and zeroReg.

Referenced by UnifiedRenameMap::rename().

◆ setEntry()

void SimpleRenameMap::setEntry	(	const RegId &	arch_reg,
		PhysRegIdPtr	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 138 of file rename_map.hh.

References RegId::flatIndex(), and map.

Referenced by UnifiedRenameMap::setEntry().

Member Data Documentation

◆ freeList

SimpleFreeList* SimpleRenameMap::freeList

private

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

Definition at line 78 of file rename_map.hh.

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

◆ map

Arch2PhysMap SimpleRenameMap::map

private

The acutal arch-to-phys register map.

Definition at line 68 of file rename_map.hh.

Referenced by begin(), cbegin(), cend(), end(), init(), lookup(), rename(), and setEntry().

◆ zeroReg

RegId 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 87 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 Types

Private Attributes

Detailed Description

Member Typedef Documentation

◆ Arch2PhysMap

◆ const_iterator

◆ iterator

◆ RenameInfo

Constructor & Destructor Documentation

◆ SimpleRenameMap()

◆ ~SimpleRenameMap()

Member Function Documentation

◆ begin() [1/2]

◆ begin() [2/2]

◆ cbegin()

◆ cend()

◆ end() [1/2]

◆ end() [2/2]

◆ init()

◆ lookup()

◆ numFreeEntries()

◆ rename()

◆ setEntry()

Member Data Documentation

◆ freeList

◆ map

◆ zeroReg