/// <summary>
/// Adds an entry to the rrfTable
/// </summary>
/// <param name="instr">Instruction to be added to the rrfTable</param>
/// <returns>The index (tag) of where it was added</returns>
public int addEntry(Instruction instr)
{
int rrfTag = -1;
// We had to create one here because we use emptySlot below
RRFEntry emptySlot = new RRFEntry();
// Note we're guaranteed an entry is open because we called spaceAvailable
// at a higher level
for (int i = 0; i < Config.numRenamingTableEntries; i++)
{
if (this.rrfTable[i].busy == false)
{
emptySlot = rrfTable[i];
rrfTag = i;
break;
}
}
emptySlot.busy = true;
emptySlot.valid = false;
// There must be a destination if this instruction requires an RRF entry
emptySlot.destReg = instr.dest;
// Data stays null until it's updated by an execution result
return(rrfTag);
}
public RenameRegisterFile()
{
this.rrfTable = new RRFEntry[Config.numRenamingTableEntries];
for (int i = 0; i < Config.numRenamingTableEntries; i++)
{
rrfTable[i] = new RRFEntry();
}
}
/// <summary>
/// Check to see if there is an available entry
/// </summary>
/// <returns>True if there is a slot avialable, false otherwise</returns>
public bool spaceAvailable()
{
for (int i = 0; i < Config.numRenamingTableEntries; i++)
{
RRFEntry entry = this.rrfTable[i];
if (entry.busy == false)
{
return(true);
}
}
return(false);
}
