public byte Shl8(byte a, byte b)
{
unchecked
{
if (b == 0)
{
return(a);
}
_aluResult = (uint)(a << (b & 0x1f));
_fm = fm.Bit8 | fm.CFromResult | fm.PFromResult | fm.SFromResult | fm.ZFromResult;
// Single bit shifts update FlagO to the xor of
// the carry flag and the msb of the result
if (b == 1)
{
if (((_aluResult ^ (_aluResult << 1)) & 0x100) != 0)
{
_fm |= fm.OFlag;
}
}
else
{
if (((_aluResult ^ (_aluResult << 1)) & (0x80 << b)) != 0)
{
_fm |= fm.OFlag;
}
}
return((byte)_aluResult);
}
}
public ushort Shr16(ushort a, byte b)
{
unchecked
{
if (b == 0)
{
return(a);
}
b &= 0x1f;
_aluResult = (uint)(a >> b);
_fm = fm.PFromResult | fm.SFromResult | fm.ZFromResult;
if (((a >> (b - 1)) & 0x01) != 0)
{
_fm |= fm.CFlag;
}
if (((_aluResult ^ a) & 0x8000) != 0)
{
_fm |= fm.OFlag;
}
return((ushort)_aluResult);
}
}
public byte Shr8(byte a, byte b)
{
unchecked
{
if (b == 0)
{
return(a);
}
b &= 0x1f;
_aluResult = (uint)(a >> b);
_fm = fm.Bit8 | fm.PFromResult | fm.SFromResult | fm.ZFromResult;
if (((a >> (b - 1)) & 0x01) != 0)
{
_fm |= fm.CFlag;
}
if (((_aluResult ^ a) & 0x80) != 0)
{
_fm |= fm.OFlag;
}
return((byte)_aluResult);
}
}
public byte Xor8(byte a, byte b)
{
unchecked
{
_aluResult = (uint)a ^ (uint)b;
_fm = fm.Bit8 | fm.CFromResult | fm.PFromResult | fm.SFromResult | fm.ZFromResult;
return((byte)_aluResult);
}
}
public ushort Xor16(ushort a, ushort b)
{
unchecked
{
_aluResult = (uint)a ^ (uint)b;
_fm = fm.CFromResult | fm.PFromResult | fm.SFromResult | fm.ZFromResult;
return((ushort)_aluResult);
}
}
public ushort Dec16(ushort a)
{
unchecked
{
_aluOperA = a;
_aluOperB = 1;
_fm = fm.AFromResult | (FlagC ? fm.CFlag : 0) | fm.OFromSub | fm.PFromResult | fm.SFromResult | fm.ZFromResult;
_aluResult = (uint)a - 1;
return((ushort)_aluResult);
}
}
public byte Dec8(byte a)
{
unchecked
{
_aluOperA = a;
_aluOperB = 1;
_fm = fm.Bit8 | fm.AFromResult | (FlagC ? fm.CFlag : 0) | fm.OFromSub | fm.PFromResult | fm.SFromResult | fm.ZFromResult;
_aluResult = (uint)a - 1;
return((byte)_aluResult);
}
}
public ushort Mul8(byte a, byte b)
{
unchecked
{
_aluResult = (uint)a * (uint)b;
_fm = fm.Bit8 | fm.PFromResult | fm.SFromResult;
FlagC = FlagO = (_aluResult & 0xFFFFFF00) != 0;
return((ushort)_aluResult);
}
}
public byte Sbb8(byte a, byte b)
{
unchecked
{
_aluResult = ((uint)a - ((uint)b + (FlagC ? 1U : 0)) & 0x1FFFF);
_aluOperA = a;
_aluOperB = b;
_fm = fm.Bit8 | fm.AFromResult | fm.CFromResult | fm.OFromSub | fm.PFromResult | fm.SFromResult | fm.ZFromResult;
return((byte)_aluResult);
}
}
public ushort Sbb16(ushort a, ushort b)
{
unchecked
{
_aluResult = ((uint)a - ((uint)b + (FlagC ? 1U : 0))) & 0x1FFFF;
_aluOperA = a;
_aluOperB = b;
_fm = fm.AFromResult | fm.CFromResult | fm.OFromSub | fm.PFromResult | fm.SFromResult | fm.ZFromResult;
return((ushort)_aluResult);
}
}
public byte Adc8(byte a, byte b)
{
unchecked
{
_aluResult = (uint)a + (uint)b + (FlagC ? 1U : 0);
_aluOperA = a;
_aluOperB = b;
_fm = fm.Bit8 | fm.AFromResult | fm.CFromResult | fm.OFromAdd | fm.PFromResult | fm.SFromResult | fm.ZFromResult;
return((byte)_aluResult);
}
}
public ushort Adc16(ushort a, ushort b)
{
unchecked
{
_aluResult = (uint)a + (uint)b + (FlagC ? 1U : 0);
_aluOperA = a;
_aluOperB = b;
_fm = fm.AFromResult | fm.CFromResult | fm.OFromAdd | fm.PFromResult | fm.SFromResult | fm.ZFromResult;
return((ushort)_aluResult);
}
}
public byte Neg8(byte b)
{
unchecked
{
_aluResult = ((uint)0 - (uint)b) & 0x1FFFF;
_aluOperA = 0;
_aluOperB = b;
_fm = fm.Bit8 | fm.AFromResult | fm.CFromResult | fm.OFromSub | fm.PFromResult | fm.SFromResult | fm.ZFromResult;
return((byte)_aluResult);
}
}
public uint Mul16(ushort a, ushort b)
{
unchecked
{
_aluResult = (uint)a * (uint)b;
_fm = fm.PFromResult | fm.SFromResult;
FlagC = FlagO = (_aluResult & 0xFFFF0000) != 0;
return(_aluResult);
}
}
public uint IMul16(ushort a, ushort b)
{
unchecked
{
_aluResult = (uint)((int)(short)a * (int)(short)b);
_fm = fm.PFromResult | fm.SFromResult;
FlagC = FlagO = (int)(short)(_aluResult & 0xFFFF) != (int)_aluResult;
return((uint)_aluResult);
}
}
public ushort Neg16(ushort b)
{
unchecked
{
_aluResult = ((uint)0 - (uint)b) & 0x1FFFF;
_aluOperA = 0;
_aluOperB = b;
_fm = fm.AFromResult | fm.CFromResult | fm.OFromSub | fm.PFromResult | fm.SFromResult | fm.ZFromResult;
return((ushort)_aluResult);
}
}
public ushort IMul8(byte a, byte b)
{
unchecked
{
_aluResult = (uint)((int)(sbyte)a * (int)(sbyte)b);
_fm = fm.Bit8 | fm.PFromResult | fm.SFromResult;
FlagC = FlagO = (int)(sbyte)(_aluResult & 0xFF) != (int)_aluResult;
return((ushort)_aluResult);
}
}
public byte Rcr8(byte a, byte b)
{
unchecked
{
if (b == 0)
{
return(a);
}
b %= 9;
_aluResult = (uint)((FlagC ? 0x100 : 0) | (a & 0xFF));
_aluResult = (_aluResult >> b) | (_aluResult << (9 - b));
bool o;
if (b == 1)
{
o = ((_aluResult ^ (_aluResult >> 1)) & 0x40) != 0;
}
else
{
if ((a & 0x80) == 0)
{
o = FlagO;
}
else
{
o = !FlagO;
}
}
_fm = fm.Bit8 | fm.CFromResult |
(o ? fm.OFlag : 0) |
(FlagS ? fm.SFlag : 0) |
(FlagZ ? fm.ZFlag : 0) |
(FlagP ? fm.PFlag : 0) |
(FlagA ? fm.AFlag : 0);
return((byte)_aluResult);
}
}
public ushort Rcr16(ushort a, byte b)
{
unchecked
{
if (b == 0)
{
return(a);
}
b %= 17;
_aluResult = (uint)((FlagC ? 0x10000 : 0) | (a & 0xFFFF));
_aluResult = (_aluResult >> b) | (_aluResult << (17 - b));
bool o;
if (b == 1)
{
o = ((_aluResult ^ (_aluResult >> 1)) & 0x4000) != 0;
}
else
{
if ((a & 0x8000) == 0)
{
o = FlagO;
}
else
{
o = !FlagO;
}
}
_fm = fm.CFromResult |
(o ? fm.OFlag : 0) |
(FlagS ? fm.SFlag : 0) |
(FlagZ ? fm.ZFlag : 0) |
(FlagP ? fm.PFlag : 0) |
(FlagA ? fm.AFlag : 0);
return((ushort)_aluResult);
}
}
public byte Ror8(byte a, byte b)
{
unchecked
{
if (b == 0)
{
return(a);
}
b %= 8;
_aluResult = (uint)((a >> b) | (a << (8 - b)));
bool o;
if (b == 1)
{
o = ((_aluResult ^ (_aluResult >> 1)) & 0x40) != 0;
}
else
{
if ((a & 0x0001) == ((a >> 7) & 0x0001))
{
o = false;
}
else
{
o = true;
}
}
_fm =
((_aluResult & 0x80) != 0 ? fm.CFlag : 0) |
(o ? fm.OFlag : 0) |
(FlagS ? fm.SFlag : 0) |
(FlagZ ? fm.ZFlag : 0) |
(FlagP ? fm.PFlag : 0) |
(FlagA ? fm.AFlag : 0);
return((byte)_aluResult);
}
}
public ushort Ror16(ushort a, byte b)
{
unchecked
{
if (b == 0)
{
return(a);
}
b %= 16;
_aluResult = (uint)((a >> b) | (a << (16 - b)));
bool o;
if (b == 1)
{
o = ((_aluResult ^ (_aluResult >> 1)) & 0x4000) != 0;
}
else
{
if ((a & 0x0001) == ((a >> 15) & 0x0001))
{
o = false;
}
else
{
o = true;
}
}
_fm =
((_aluResult & 0x8000) != 0 ? fm.CFlag : 0) |
(o ? fm.OFlag : 0) |
(FlagS ? fm.SFlag : 0) |
(FlagZ ? fm.ZFlag : 0) |
(FlagP ? fm.PFlag : 0) |
(FlagA ? fm.AFlag : 0);
return((ushort)_aluResult);
}
}
public byte Rcl8(byte a, byte b)
{
if (b == 0)
{
return(a);
}
b %= 9;
_aluResult = (uint)((FlagC ? 0x100 : 0) | (a & 0xFF));
_aluResult = (_aluResult << b) | (_aluResult >> (9 - b));
bool o;
if (b == 1)
{
o = ((_aluResult ^ (_aluResult << 1)) & 0x100) != 0;
}
else
{
if (((a >> 1) & 0x40) == (a & 0x40))
{
o = false;
}
else
{
o = true;
}
}
_fm = fm.Bit8 | fm.CFromResult |
(o ? fm.OFlag : 0) |
(FlagS ? fm.SFlag : 0) |
(FlagZ ? fm.ZFlag : 0) |
(FlagP ? fm.PFlag : 0) |
(FlagA ? fm.AFlag : 0);
return((byte)_aluResult);
}
public ushort Rcl16(ushort a, byte b)
{
if (b == 0)
{
return(a);
}
b %= 17;
_aluResult = (uint)((FlagC ? 0x10000 : 0) | (a & 0xFFFF));
_aluResult = (_aluResult << b) | (_aluResult >> (17 - b));
bool o;
if (b == 1)
{
o = ((_aluResult ^ (_aluResult << 1)) & 0x10000) != 0;
}
else
{
if (((a >> 1) & 0x4000) == (a & 0x4000))
{
o = false;
}
else
{
o = true;
}
}
_fm = fm.CFromResult |
(o ? fm.OFlag : 0) |
(FlagS ? fm.SFlag : 0) |
(FlagZ ? fm.ZFlag : 0) |
(FlagP ? fm.PFlag : 0) |
(FlagA ? fm.AFlag : 0);
return((ushort)_aluResult);
}