gem5::o3::UnifiedFreeList Class Reference

FreeList class that simply holds the list of free integer and floating point registers. More...

#include <free_list.hh>

Public Member Functions
	UnifiedFreeList (const std::string &_my_name, PhysRegFile *_regFile)
	Constructs a free list. More...
std::string	name () const
	Gives the name of the freelist. More...
PhysRegIdPtr	getReg (RegClassType type)
	Gets a free register of type type. More...
template<class InputIt >
void	addRegs (InputIt first, InputIt last)
	Adds a register back to the free list. More...
void	addReg (PhysRegIdPtr freed_reg)
	Adds a register back to the free list. More...
bool	hasFreeRegs (RegClassType type) const
	Checks if there are any free registers of type type. More...
unsigned	numFreeRegs (RegClassType type) const
	Returns the number of free registers of type type. More...

Private Attributes
const std::string	_name
	The object name, for DPRINTF. More...
std::array< SimpleFreeList, CCRegClass+1 >	freeLists
PhysRegFile *	regFile
	The register file object is used only to distinguish integer from floating-point physical register indices. More...

Friends
class	UnifiedRenameMap

Detailed Description

FreeList class that simply holds the list of free integer and floating point registers.

Can request for a free register of either type, and also send back free registers of either type. This is a very simple class, but it should be sufficient for most implementations. Like all other classes, it assumes that the indices for the floating point registers starts after the integer registers end. Hence the variable numPhysicalIntRegs is logically equivalent to the baseFP dependency. Note that while this most likely should be called FreeList, the name "FreeList" is used in a typedef within the CPU Policy, and therefore no class can be named simply "FreeList".

Todo:

: Give a better name to the base FP dependency.

Definition at line 124 of file free_list.hh.

Constructor & Destructor Documentation

UnifiedFreeList()

gem5::o3::UnifiedFreeList::UnifiedFreeList	(	const std::string &	_my_name,
		PhysRegFile *	_regFile
	)

Constructs a free list.

Parameters

_numPhysicalIntRegs	Number of physical integer registers.
reservedIntRegs	Number of integer registers already used by initial mappings.
_numPhysicalFloatRegs	Number of physical fp registers.
reservedFloatRegs	Number of fp registers already used by initial mappings.

Definition at line 41 of file free_list.cc.

References DPRINTF, gem5::o3::PhysRegFile::initFreeList(), and regFile.

Member Function Documentation

addReg()

void gem5::o3::UnifiedFreeList::addReg ( PhysRegIdPtr  freed_reg )

inline

Adds a register back to the free list.

Definition at line 174 of file free_list.hh.

References gem5::PhysRegId::classValue(), and freeLists.

Referenced by addRegs(), gem5::o3::Rename::doSquash(), and gem5::o3::Rename::removeFromHistory().

addRegs()

template<class InputIt >

void gem5::o3::UnifiedFreeList::addRegs ( InputIt  first, InputIt  last  )

inline

Adds a register back to the free list.

Definition at line 167 of file free_list.hh.

References addReg(), and gem5::X86ISA::reg.

Referenced by gem5::o3::PhysRegFile::initFreeList().

getReg()

PhysRegIdPtr gem5::o3::UnifiedFreeList::getReg ( RegClassType  type )

inline

Gets a free register of type type.

Definition at line 162 of file free_list.hh.

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

Referenced by gem5::o3::CPU::insertThread().

hasFreeRegs()

bool gem5::o3::UnifiedFreeList::hasFreeRegs ( RegClassType  type ) const

inline

Checks if there are any free registers of type type.

Definition at line 181 of file free_list.hh.

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

name()

std::string gem5::o3::UnifiedFreeList::name ( ) const

inline

Gives the name of the freelist.

Definition at line 159 of file free_list.hh.

References _name.

numFreeRegs()

unsigned gem5::o3::UnifiedFreeList::numFreeRegs ( RegClassType  type ) const

inline

Returns the number of free registers of type type.

Definition at line 188 of file free_list.hh.

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

Friends And Related Function Documentation

UnifiedRenameMap

friend class UnifiedRenameMap

friend

Definition at line 145 of file free_list.hh.

Member Data Documentation

_name

const std::string gem5::o3::UnifiedFreeList::_name

private

The object name, for DPRINTF.

We have to declare this explicitly because Scoreboard is not a SimObject.

Definition at line 130 of file free_list.hh.

Referenced by name().

freeLists

std::array<SimpleFreeList, CCRegClass + 1> gem5::o3::UnifiedFreeList::freeLists

private

Definition at line 132 of file free_list.hh.

Referenced by addReg(), getReg(), hasFreeRegs(), gem5::o3::UnifiedRenameMap::init(), and numFreeRegs().

regFile

PhysRegFile* gem5::o3::UnifiedFreeList::regFile

private

The register file object is used only to distinguish integer from floating-point physical register indices.

Definition at line 138 of file free_list.hh.

Referenced by UnifiedFreeList().

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

• cpu/o3/free_list.hh
• cpu/o3/free_list.cc