gem5::o3::UnifiedRenameMap Class Reference

Unified register rename map for all classes of registers. More...

#include <rename_map.hh>

Public Types
typedef SimpleRenameMap::RenameInfo	RenameInfo
typedef std::array< UnifiedRenameMap, MaxThreads >	PerThreadUnifiedRenameMap

Public Member Functions
	UnifiedRenameMap ()
	Default constructor.
	~UnifiedRenameMap ()
	Destructor.
void	init (const BaseISA::RegClasses &regClasses, PhysRegFile *_regFile, UnifiedFreeList *freeList)
	Initializes rename map with given parameters.
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	minFreeEntries () const
	Return the minimum number of free entries across all of the register classes.
unsigned	numFreeEntries (RegClassType type) const
bool	canRename (DynInstPtr inst) const
	Return whether there are enough registers to serve the request.

Private Attributes
std::array< SimpleRenameMap, CCRegClass+1 >	renameMaps
PhysRegFile *	regFile
	The register file object is used only to get PhysRegIdPtr on MiscRegs, as they are stored in it.

Static Private Attributes
static PhysRegId	invalidPhysRegId {}

Detailed Description

Unified register rename map for all classes of registers.

Wraps a set of class-specific rename maps. Methods that do not specify a register class (e.g., rename()) take register ids, while methods that do specify a register class (e.g., renameInt()) take register indices.

Definition at line 168 of file rename_map.hh.

Member Typedef Documentation

PerThreadUnifiedRenameMap

typedef std::array<UnifiedRenameMap, MaxThreads> gem5::o3::UnifiedRenameMap::PerThreadUnifiedRenameMap

Definition at line 185 of file rename_map.hh.

RenameInfo

typedef SimpleRenameMap::RenameInfo gem5::o3::UnifiedRenameMap::RenameInfo

Definition at line 183 of file rename_map.hh.

Constructor & Destructor Documentation

UnifiedRenameMap()

gem5::o3::UnifiedRenameMap::UnifiedRenameMap ( )

inline

Default constructor.

init() must be called prior to use.

Definition at line 188 of file rename_map.hh.

~UnifiedRenameMap()

gem5::o3::UnifiedRenameMap::~UnifiedRenameMap ( )

inline

Destructor.

Definition at line 191 of file rename_map.hh.

Member Function Documentation

canRename()

bool gem5::o3::UnifiedRenameMap::canRename

(

DynInstPtr

inst

)

const

Return whether there are enough registers to serve the request.

Definition at line 120 of file rename_map.cc.

References gem5::ArmISA::i, and renameMaps.

init()

void gem5::o3::UnifiedRenameMap::init	(	const BaseISA::RegClasses &	regClasses,
		PhysRegFile *	_regFile,
		UnifiedFreeList *	freeList )

Initializes rename map with given parameters.

Definition at line 110 of file rename_map.cc.

References gem5::o3::UnifiedFreeList::freeLists, gem5::ArmISA::i, gem5::statistics::init, regFile, and renameMaps.

lookup()

PhysRegIdPtr gem5::o3::UnifiedRenameMap::lookup ( const RegId & arch_reg ) const

inline

Look up the physical register mapped to an architectural register.

This version takes a flattened architectural register id and calls the appropriate class-specific rename table.

Parameters

arch_reg

The architectural register to look up.

Returns

The physical register it is currently mapped to.

Definition at line 227 of file rename_map.hh.

References gem5::RegId::classValue(), gem5::o3::PhysRegFile::getMiscRegId(), gem5::RegId::index(), invalidPhysRegId, gem5::InvalidRegClass, gem5::MiscRegClass, regFile, and renameMaps.

Referenced by rename(), and setEntry().

minFreeEntries()

unsigned gem5::o3::UnifiedRenameMap::minFreeEntries ( ) const

inline

Return the minimum number of free entries across all of the register classes.

The minimum is used so we guarantee that this number of entries is available regardless of which class of registers is requested.

Definition at line 271 of file rename_map.hh.

References renameMaps.

numFreeEntries()

unsigned gem5::o3::UnifiedRenameMap::numFreeEntries ( RegClassType type ) const

inline

Definition at line 283 of file rename_map.hh.

References renameMaps, and gem5::X86ISA::type.

rename()

RenameInfo gem5::o3::UnifiedRenameMap::rename ( const RegId & arch_reg )

inline

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

This version takes a RegId and reads the appropriate class-specific rename table.

Parameters

arch_reg

The architectural register id to remap.

Returns

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

Definition at line 206 of file rename_map.hh.

References gem5::RegId::classValue(), gem5::RegId::isRenameable(), lookup(), and renameMaps.

setEntry()

void gem5::o3::UnifiedRenameMap::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. This version takes a flattened architectural register id and calls the appropriate class-specific rename table.

Parameters

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

Definition at line 249 of file rename_map.hh.

References gem5::RegId::classValue(), gem5::PhysRegId::is(), gem5::RegId::isRenameable(), lookup(), and renameMaps.

Referenced by gem5::o3::Commit::commitHead(), and gem5::o3::Rename::doSquash().

Member Data Documentation

invalidPhysRegId

PhysRegId gem5::o3::UnifiedRenameMap::invalidPhysRegId {}

inlinestaticprivate

Definition at line 173 of file rename_map.hh.

Referenced by lookup().

regFile

PhysRegFile* gem5::o3::UnifiedRenameMap::regFile

private

The register file object is used only to get PhysRegIdPtr on MiscRegs, as they are stored in it.

Definition at line 179 of file rename_map.hh.

Referenced by init(), and lookup().

renameMaps

std::array<SimpleRenameMap, CCRegClass + 1> gem5::o3::UnifiedRenameMap::renameMaps

private

Definition at line 171 of file rename_map.hh.

Referenced by canRename(), init(), lookup(), minFreeEntries(), numFreeEntries(), rename(), and setEntry().

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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