func (this *Dispatcher) runDispatcherToReservationStation(input channel.Channel,
rs *reservationstation.ReservationStation, rat *registeraliastable.RegisterAliasTable, rob *reorderbuffer.ReorderBuffer) {
incomingQueue := map[uint32]*operation.Operation{}
currentOperationId := this.StartOperationId()
// For each operation received to schedule, process it
for {
value, running := <-input.Channel()
if !running || !this.IsActive() {
logger.Print(" => Flushing dispatcher unit %d (dispatcher to RS)", this.Index())
return
}
op := operation.Cast(value)
// Add to current operation
incomingQueue[op.Id()] = op
// Send to incoming channel pending ops (if available)
for op, exists := incomingQueue[currentOperationId]; exists; op, exists = incomingQueue[currentOperationId] {
// Allocate in ROB if there is spacde, otherwise stall
rob.Allocate(op)
// Rename register in case of WAR & WAR hazards
if this.RegisterAliasTableEntries() > 0 {
_, destRegister := rs.GetDestinationDependency(op.Id(), op.Instruction())
if destRegister != -1 {
found, _ := rat.AddMap(uint32(destRegister), op.Id())
if !found {
// Need to stall for an available RAT entry
logger.Collect(" => [DI%d][%03d]: No entry available in RAT. Wait for one...", this.Index(), op.Id())
break
}
// Rename to physical registers
this.renameRegisters(op.Id(), op, rat)
}
}
//Redirect input operations to the required execution unit channels
logger.Collect(" => [DI%d][%03d]: Scheduling to RS: %s, %s", this.Index(), op.Id(), op.Instruction().Info.ToString(), op.Instruction().Data.ToString())
rs.Schedule(op)
currentOperationId += 1
}
input.Release()
}
}
func (this *Dispatcher) renameRegisters(operationId uint32, op *operation.Operation, rat *registeraliastable.RegisterAliasTable) {
if op.Instruction().Info.Type == data.TypeI {
data := op.Instruction().Data.(*data.DataI)
if !op.Instruction().Info.IsBranch() {
opcode := op.Instruction().Info.Opcode
if opcode != set.OP_SW && opcode != set.OP_SLI && opcode != set.OP_SUI {
reg, _ := rat.GetPhysicalRegister(operationId, data.RegisterD.ToUint32())
op.SetRenamedDestRegister(reg)
}
}
op.Instruction().Data = data
} else if op.Instruction().Info.Type == data.TypeR {
data := op.Instruction().Data.(*data.DataR)
reg, _ := rat.GetPhysicalRegister(operationId, data.RegisterD.ToUint32())
op.SetRenamedDestRegister(reg)
}
}
