public static void ShiftLeft(IRegister <byte> target, IFlags flags)
{
flags.Carry = target.GetBit(7);
target.Value = (byte)(target.Value << 1);
flags.Subtract = flags.HalfCarry = false;
flags.Zero = target.Value == 0;
}
public static void ShiftRightLogical(IRegister <byte> target, IFlags flags)
{
flags.Carry = target.GetBit(0);
target.Value = (byte)(target.Value >> 1);
flags.Subtract = flags.HalfCarry = false;
flags.Zero = target.Value == 0;
}
public static void RotateRight(IRegister <byte> target, IFlags flags)
{
flags.Carry = target.GetBit(0);
target.Value = (byte)(target.Value >> 1 | target.Value << 7);
flags.Subtract = flags.HalfCarry = false;
flags.Zero = target.Value == 0;
}
public static void RotateLeft(IRegister <byte> target, IFlags flags)
{
target.Value = (byte)((target.Value << 1) | (target.Value >> 7));
flags.Zero = target.Value == 0;
flags.Subtract = flags.HalfCarry = false;
flags.Carry = target.GetBit(0);
}
public static void ShiftRightArithmetic(IRegister <byte> target, IFlags flags)
{
flags.Carry = target.GetBit(0);
var msbMask = target.Value & 0x80;
target.Value = (byte)((target.Value >> 1) | msbMask);
flags.Subtract = flags.HalfCarry = false;
flags.Zero = target.Value == 0;
}
public static void RotateRightThroughCarry(IRegister <byte> target, IFlags flags)
{
var carry = flags.Carry ? 1 : 0;
flags.Carry = target.GetBit(0);
target.Value = (byte)(carry << 7 | target.Value >> 1);
flags.Subtract = flags.HalfCarry = false;
flags.Zero = target.Value == 0;
}
public static void RotateLeftThroughCarry(IRegister <byte> target, IFlags flags)
{
var carry = flags.Carry ? 1 : 0;
flags.Carry = target.GetBit(7);
target.Value = (byte)((target.Value << 1) | carry);
flags.Subtract = flags.HalfCarry = false;
flags.Zero = target.Value == 0;
}