public static int Ret(Opcode op, GbMemory mem)
{
byte low = mem.ReadCyclePop();
mem.R.Pc = new GbUInt16(mem.ReadCyclePop(), low);
mem.Update();
mem.IME |= op.Dest != 0; // Unlike EI IME gets enabled right away.
mem.NextIMEValue = mem.IME;
return(4);
}
/// <summary>
/// Conditional Return.
/// </summary>
/// <param name="op">The opcode.</param>
/// <param name="mem">The memory.</param>
public static int RetC(Opcode op, GbMemory mem)
{
mem.Update();
if (GetConditionalJumpState(op.Dest, op.Src, mem.R.F))
{
return(2);
}
byte low = mem.ReadCyclePop();
mem.R.Pc = new GbUInt16(mem.ReadCyclePop(), low);
mem.Update();
return(5);
}
public static int Pop(Opcode op, GbMemory mem)
{
if (op.Dest == 3)
{
mem.R.F = (byte)(mem.ReadCyclePop() & 0xF0);
mem.R.A = mem.ReadCyclePop();
}
else
{
mem.R.SetR8((op.Dest * 2) + 1, mem.ReadCyclePop());
mem.R.SetR8(op.Dest * 2, mem.ReadCyclePop());
}
return(3);
}