gem5::o3::SimpleRenameMap Class Reference

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.

Public Member Functions
	SimpleRenameMap ()
void	init (const RegClass &reg_class, SimpleFreeList *_freeList)
	Because we have an array of rename maps (one per thread) in the CPU, it's awkward to initialize this object via the constructor.
RenameInfo	rename (const RegId &arch_reg)
	Tell rename map to get a new free physical register to remap the specified architectural register.
PhysRegIdPtr	lookup (const RegId &arch_reg) const
	Look up the physical register mapped to an architectural register.
void	setEntry (const RegId &arch_reg, PhysRegIdPtr phys_reg)
	Update rename map with a specific mapping.
unsigned	numFreeEntries () const
	Return the number of free entries on the associated free list.
size_t	numArchRegs () const
iterator	begin ()
	Forward begin/cbegin to the map.
const_iterator	begin () const
const_iterator	cbegin () const
iterator	end ()
	Forward end/cend to the map.
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.
SimpleFreeList *	freeList
	Pointer to the free list from which new physical registers should be allocated in rename()

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 71 of file rename_map.hh.

Member Typedef Documentation

Arch2PhysMap

using gem5::o3::SimpleRenameMap::Arch2PhysMap = std::vector<PhysRegIdPtr>

private

Definition at line 74 of file rename_map.hh.

const_iterator

using gem5::o3::SimpleRenameMap::const_iterator = Arch2PhysMap::const_iterator

Definition at line 79 of file rename_map.hh.

iterator

using gem5::o3::SimpleRenameMap::iterator = Arch2PhysMap::iterator

Definition at line 78 of file rename_map.hh.

RenameInfo

typedef std::pair<PhysRegIdPtr, PhysRegIdPtr> gem5::o3::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 105 of file rename_map.hh.

Constructor & Destructor Documentation

SimpleRenameMap()

gem5::o3::SimpleRenameMap::SimpleRenameMap

(

)

Definition at line 56 of file rename_map.cc.

Member Function Documentation

begin() [1/2]

iterator gem5::o3::SimpleRenameMap::begin ( )

inline

Forward begin/cbegin to the map.

Definition at line 148 of file rename_map.hh.

begin() [2/2]

const_iterator gem5::o3::SimpleRenameMap::begin ( ) const

inline

Definition at line 149 of file rename_map.hh.

cbegin()

const_iterator gem5::o3::SimpleRenameMap::cbegin ( ) const

inline

Definition at line 150 of file rename_map.hh.

cend()

const_iterator gem5::o3::SimpleRenameMap::cend ( ) const

inline

Definition at line 157 of file rename_map.hh.

end() [1/2]

iterator gem5::o3::SimpleRenameMap::end ( )

inline

Forward end/cend to the map.

Definition at line 155 of file rename_map.hh.

end() [2/2]

const_iterator gem5::o3::SimpleRenameMap::end ( ) const

inline

Definition at line 156 of file rename_map.hh.

init()

void gem5::o3::SimpleRenameMap::init	(	const RegClass &	reg_class,
		SimpleFreeList *	_freeList )

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 62 of file rename_map.cc.

References freeList, and gem5::RegClass::numRegs().

lookup()

PhysRegIdPtr gem5::o3::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 122 of file rename_map.hh.

References gem5::RegId::index().

numArchRegs()

size_t gem5::o3::SimpleRenameMap::numArchRegs ( ) const

inline

Definition at line 144 of file rename_map.hh.

numFreeEntries()

unsigned gem5::o3::SimpleRenameMap::numFreeEntries ( ) const

inline

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

Definition at line 142 of file rename_map.hh.

References freeList, and gem5::o3::SimpleFreeList::numFreeRegs().

rename()

SimpleRenameMap::RenameInfo gem5::o3::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 gem5::PhysRegId::decrNumPinnedWrites(), DPRINTF, gem5::PhysRegId::flatIndex(), freeList, gem5::PhysRegId::getNumPinnedWrites(), gem5::RegId::getNumPinnedWrites(), gem5::o3::SimpleFreeList::getReg(), gem5::RegId::index(), gem5::InvalidRegClass, gem5::PhysRegId::is(), gem5::RegId::is(), gem5::PhysRegId::setNumPinnedWrites(), and gem5::PhysRegId::setNumPinnedWritesToComplete().

setEntry()

void gem5::o3::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 135 of file rename_map.hh.

References gem5::RegId::index().

Member Data Documentation

freeList

SimpleFreeList* gem5::o3::SimpleRenameMap::freeList

private

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

Definition at line 86 of file rename_map.hh.

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

map

Arch2PhysMap gem5::o3::SimpleRenameMap::map

private

The acutal arch-to-phys register map.

Definition at line 76 of file rename_map.hh.

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

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