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// Todo: Create destructor.
// Have it so that there's a more meaningful name given to the variable
// that marks the beginning of the FP registers.
#ifndef __CPU_BETA_CPU_RENAME_MAP_HH__
#define __CPU_BETA_CPU_RENAME_MAP_HH__
#include <iostream>
#include <utility>
#include <vector>
#include "cpu/beta_cpu/free_list.hh"
class SimpleRenameMap
{
public:
/**
* Pair of a logical register and a physical register. Tells the
* previous mapping of a logical register to a physical register.
* Used to roll back the rename map to a previous state.
*/
typedef std::pair<RegIndex, PhysRegIndex> UnmapInfo;
/**
* 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.
*/
typedef std::pair<PhysRegIndex, PhysRegIndex> RenameInfo;
public:
//Constructor
SimpleRenameMap(unsigned _numLogicalIntRegs,
unsigned _numPhysicalIntRegs,
unsigned _numLogicalFloatRegs,
unsigned _numPhysicalFloatRegs,
unsigned _numMiscRegs,
RegIndex _intZeroReg,
RegIndex _floatZeroReg);
/** Destructor. */
~SimpleRenameMap();
void setFreeList(SimpleFreeList *fl_ptr);
//Tell rename map to get a free physical register for a given
//architected register. Not sure it should have a return value,
//but perhaps it should have some sort of fault in case there are
//no free registers.
RenameInfo rename(RegIndex arch_reg);
PhysRegIndex lookup(RegIndex phys_reg);
bool isReady(PhysRegIndex arch_reg);
/**
* Marks the given register as ready, meaning that its value has been
* calculated and written to the register file.
* @params ready_reg The index of the physical register that is now
* ready.
*/
void markAsReady(PhysRegIndex ready_reg);
void setEntry(RegIndex arch_reg, PhysRegIndex renamed_reg);
void squash(std::vector<RegIndex> freed_regs,
std::vector<UnmapInfo> unmaps);
int numFreeEntries();
private:
/** Number of logical integer registers. */
int numLogicalIntRegs;
/** Number of physical integer registers. */
int numPhysicalIntRegs;
/** Number of logical floating point registers. */
int numLogicalFloatRegs;
/** Number of physical floating point registers. */
int numPhysicalFloatRegs;
/** Number of miscellaneous registers. */
int numMiscRegs;
/** Number of logical integer + float registers. */
int numLogicalRegs;
/** Number of physical integer + float registers. */
int numPhysicalRegs;
/** The integer zero register. This implementation assumes it is always
* zero and never can be anything else.
*/
RegIndex intZeroReg;
/** The floating point zero register. This implementation assumes it is
* always zero and never can be anything else.
*/
RegIndex floatZeroReg;
class RenameEntry
{
public:
PhysRegIndex physical_reg;
bool valid;
RenameEntry()
: physical_reg(0), valid(false)
{ }
};
/** Integer rename map. */
RenameEntry *intRenameMap;
/** Floating point rename map. */
RenameEntry *floatRenameMap;
/** Free list interface. */
SimpleFreeList *freeList;
// Might want to make all these scoreboards into one large scoreboard.
/** Scoreboard of physical integer registers, saying whether or not they
* are ready.
*/
std::vector<bool> intScoreboard;
/** Scoreboard of physical floating registers, saying whether or not they
* are ready.
*/
std::vector<bool> floatScoreboard;
/** Scoreboard of miscellaneous registers, saying whether or not they
* are ready.
*/
std::vector<bool> miscScoreboard;
};
#endif //__CPU_BETA_CPU_RENAME_MAP_HH__
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