/**
* ****************************************************************************
* Copyright (c) 2010-2016 by Min Cai (min.cai.china@gmail.com).
* <p>
* This file is part of the Archimulator multicore architectural simulator.
* <p>
* Archimulator is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* <p>
* Archimulator is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* <p>
* You should have received a copy of the GNU General Public License
* along with Archimulator. If not, see <http://www.gnu.org/licenses/>.
* ****************************************************************************
*/
package archimulator.core;
import java.util.ArrayList;
import java.util.List;
/**
* Physical register.
*
* @author Min Cai
*/
public class PhysicalRegister {
private PhysicalRegisterFile physicalRegisterFile;
private PhysicalRegisterState state;
private int dependency;
private List<ReorderBufferEntry> effectiveAddressComputationOperandDependents;
private List<LoadStoreQueueEntry> storeAddressDependents;
private List<AbstractReorderBufferEntry> dependents;
/**
* Create a physical register.
*
* @param physicalRegisterFile the parent physical register file
*/
public PhysicalRegister(PhysicalRegisterFile physicalRegisterFile) {
this.physicalRegisterFile = physicalRegisterFile;
this.state = PhysicalRegisterState.AVAILABLE;
this.effectiveAddressComputationOperandDependents = new ArrayList<>();
this.storeAddressDependents = new ArrayList<>();
this.dependents = new ArrayList<>();
}
/**
* Reserve for the specified dependency.
*
* @param dependency the dependency
*/
public void reserve(int dependency) {
if (this.state != PhysicalRegisterState.AVAILABLE) {
throw new IllegalArgumentException();
}
this.dependency = dependency;
this.state = PhysicalRegisterState.ARCHITECTURAL_REGISTER;
this.physicalRegisterFile.setNumFreePhysicalRegisters(this.physicalRegisterFile.getNumFreePhysicalRegisters() - 1);
}
/**
* Allocate for the specified dependency.
*
* @param dependency the dependency
*/
public void allocate(int dependency) {
if (this.state != PhysicalRegisterState.AVAILABLE) {
throw new IllegalArgumentException();
}
this.dependency = dependency;
this.state = PhysicalRegisterState.RENAME_BUFFER_NOT_VALID;
this.physicalRegisterFile.setNumFreePhysicalRegisters(this.physicalRegisterFile.getNumFreePhysicalRegisters() - 1);
}
/**
* Write back.
*/
public void writeback() {
if (this.state != PhysicalRegisterState.RENAME_BUFFER_NOT_VALID) {
throw new IllegalArgumentException();
}
this.state = PhysicalRegisterState.RENAME_BUFFER_VALID;
for (ReorderBufferEntry effectiveAddressComputationOperandDependent : this.effectiveAddressComputationOperandDependents) {
effectiveAddressComputationOperandDependent.setEffectiveAddressComputationOperandReady(true);
}
for (LoadStoreQueueEntry storeAddressDependent : this.storeAddressDependents) {
storeAddressDependent.setStoreAddressReady(true);
}
for (AbstractReorderBufferEntry dependent : this.dependents) {
dependent.setNumNotReadyOperands(dependent.getNumNotReadyOperands() - 1);
}
this.effectiveAddressComputationOperandDependents.clear();
this.storeAddressDependents.clear();
this.dependents.clear();
}
/**
* Commit.
*/
public void commit() {
if (this.state != PhysicalRegisterState.RENAME_BUFFER_VALID) {
throw new IllegalArgumentException();
}
this.state = PhysicalRegisterState.ARCHITECTURAL_REGISTER;
}
/**
* Recover.
*/
public void recover() {
if (this.state != PhysicalRegisterState.RENAME_BUFFER_NOT_VALID && this.state != PhysicalRegisterState.RENAME_BUFFER_VALID) {
throw new IllegalArgumentException();
}
this.dependency = -1;
this.state = PhysicalRegisterState.AVAILABLE;
this.physicalRegisterFile.setNumFreePhysicalRegisters(this.physicalRegisterFile.getNumFreePhysicalRegisters() + 1);
}
/**
* Reclaim.
*/
public void reclaim() {
if (this.state != PhysicalRegisterState.ARCHITECTURAL_REGISTER) {
throw new IllegalArgumentException();
}
this.dependency = -1;
this.state = PhysicalRegisterState.AVAILABLE;
this.physicalRegisterFile.setNumFreePhysicalRegisters(this.physicalRegisterFile.getNumFreePhysicalRegisters() + 1);
}
/**
* Get a value indicating whether the physical register is ready or not.
*
* @return a value indicating whether the physical register is ready or not
*/
public boolean isReady() {
return this.state == PhysicalRegisterState.RENAME_BUFFER_VALID || this.state == PhysicalRegisterState.ARCHITECTURAL_REGISTER;
}
/**
* Get the parent physical register file.
*
* @return the parent physical register file
*/
public PhysicalRegisterFile getPhysicalRegisterFile() {
return physicalRegisterFile;
}
/**
* Get the current dependency.
*
* @return the current dependency
*/
public int getDependency() {
return dependency;
}
/**
* Get the state of the physical register.
*
* @return the state of the physical register
*/
public PhysicalRegisterState getState() {
return state;
}
/**
* Get the list of dependents.
*
* @return the list of dependents
*/
public List<AbstractReorderBufferEntry> getDependents() {
return dependents;
}
/**
* Get the list of store address dependents.
*
* @return the list of store address dependents
*/
public List<LoadStoreQueueEntry> getStoreAddressDependents() {
return storeAddressDependents;
}
/**
* Get the list of effective address computation operand dependents.
*
* @return the list of effective address computation operand dependents
*/
public List<ReorderBufferEntry> getEffectiveAddressComputationOperandDependents() {
return effectiveAddressComputationOperandDependents;
}
}