public ExecutionResult Execute(Processor cpu, InstructionPackage package)
{
Instruction instruction = package.Instruction;
InstructionData data = package.Data;
Registers r = cpu.Registers;
if (instruction.Opcode == 0x08)
{
// EX AF,AF'
r.ExchangeAF();
}
else
{
if (instruction.Target == InstructionElement.AddressFromSP)
{
// EX (SP),HL/IX/IY
ushort value = instruction.MarshalSourceWord(data, cpu, out ushort address);
ushort valueAtSP = cpu.Memory.Untimed.ReadWordAt(r.SP);
r[instruction.Source.AsWordRegister()] = valueAtSP;
cpu.Memory.Timed.WriteWordAt(r.SP, value);
r.WZ = valueAtSP;
}
else
{
// EX DE,HL
ushort de = r.DE;
r.DE = r.HL;
r.HL = de;
}
}
return(new ExecutionResult(package, null));
}
public void EX_AF_AF()
{
Registers.AF = 0x80;
Registers.ExchangeAF();
Registers.AF = 0x90;
Registers.ExchangeAF();
ExecuteInstruction("EX AF,AF'");
Assert.That(CPU.Registers.AF == 0x90);
ExecuteInstruction("EX AF,AF'");
Assert.That(CPU.Registers.AF == 0x80);
}
