/// <summary>
/// Executes an operation on the ALU
/// Reads the input value from the X- and Y-Bus on the processor
/// </summary>
/// <param name="op">The operation to execute</param>
/// <param name="affectFlags">If true, affects the status-register-flags</param>
public void Execute(Cmd op, bool affectFlags)
{
IAluCommand aluCommand = GetAluCommand(op);
if (aluCommand != null)
{
Res = aluCommand.Execute();
if (affectFlags)
{
SetFlags(aluCommand);
}
}
}
/// <summary>
/// Set the flags in the status register of the processor
/// </summary>
/// <param name="op">Operation which was executed</param>
private void SetFlags(IAluCommand aluCommand)
{
// Zero Flag
proc.Z = Res == 0;
// Sign Flag
proc.S = (Res & MSB) == MSB;
if (aluCommand != null)
{
aluCommand.SetFlags(proc);
}
else
{
proc.O = false;
}
}
