protected int SubqWord(int opcode)
{
int s = (opcode >> 9 & 0x07);
if (s == 0)
{
s = 8;
}
int mode = (opcode >> 3) & 0x07;
if (mode != 1)
{
IOperand dst = cpu.ResolveDstEA(mode, (opcode & 0x07), Size.Word);
int d = dst.GetWordSigned();
int r = d - s;
dst.SetWord(r);
cpu.CalcFlags(InstructionType.SUB, s, d, r, Size.Word);
return(dst.IsRegisterMode() ? 4 : 8 + dst.GetTiming());
}
else
{
int reg = opcode & 0x07;
cpu.SetAddrRegisterLong(reg, cpu.GetAddrRegisterLong(reg) - s);
return(4);
}
}
protected int MoveaWord(int opcode)
{
IOperand src = cpu.ResolveSrcEA((opcode >> 3) & 0x07, opcode & 0x07, Size.Word);
cpu.SetAddrRegisterLong((opcode >> 9) & 0x07, src.GetWordSigned());
return(MOVE.ShortExecutionTime[src.Index()][1]);
}
protected int OriWord(int opcode)
{
int s = cpu.FetchPCWordSigned();
IOperand dst = cpu.ResolveDstEA((opcode >> 3) & 0x07, opcode & 0x07, Size.Word);
int d = dst.GetWordSigned();
int r = s | d;
if (dst.IsSR())
{
if (cpu.IsSupervisorMode())
{
cpu.SetSR(r);
}
else
{
cpu.RaiseSRException();
return(34);
}
}
else
{
dst.SetWord(r);
cpu.CalcFlags(InstructionType.OR, s, d, r, Size.Word);
}
return(dst.IsRegisterMode() ? 8 : 12 + dst.GetTiming());
}
protected int AddaWord(int opcode)
{
IOperand src = cpu.ResolveSrcEA((opcode >> 3) & 0x07, (opcode & 0x07), Size.Word);
int s = src.GetWordSigned();
int reg = (opcode >> 9) & 0x07;
cpu.SetAddrRegisterLong(reg, cpu.GetAddrRegisterLong(reg) + s);
return(8 + src.GetTiming());
}
protected int CmpiWord(int opcode)
{
int s = cpu.FetchPCWordSigned();
IOperand op = cpu.ResolveDstEA((opcode >> 3) & 0x07, (opcode & 0x07), Size.Word);
int d = op.GetWordSigned();
int r = d - s;
cpu.CalcFlags(InstructionType.CMP, s, d, r, Size.Word);
return(op.IsRegisterMode() ? 8 : 8 + op.GetTiming());
}
protected int CmpaWord(int opcode)
{
IOperand op = cpu.ResolveSrcEA((opcode >> 3) & 0x07, (opcode & 0x07), Size.Word);
int d = cpu.GetAddrRegisterLong((opcode >> 9) & 0x07);
int s = op.GetWordSigned();
int r = d - s;
cpu.CalcFlags(InstructionType.CMP, s, d, r, Size.SizeLong);
return(6 + op.GetTiming());
}
protected int SubiWord(int opcode)
{
int s = cpu.FetchPCWordSigned();
IOperand dst = cpu.ResolveDstEA((opcode >> 3) & 0x07, opcode & 0x07, Size.Word);
int d = dst.GetWordSigned();
int r = d - s;
dst.SetWord(r);
cpu.CalcFlags(InstructionType.SUB, s, d, r, Size.Word);
return(dst.IsRegisterMode() ? 8 : 12 + dst.GetTiming());
}
protected int SubWordEaDest(int opcode)
{
int s = cpu.GetDataRegisterWordSigned((opcode >> 9) & 0x07);
IOperand dst = cpu.ResolveDstEA((opcode >> 3) & 0x07, opcode & 0x07, Size.Word);
int d = dst.GetWordSigned();
int r = d - s;
dst.SetWord(r);
int time = 8 + dst.GetTiming();
cpu.CalcFlags(InstructionType.SUB, s, d, r, Size.Word);
return(time);
}
protected int Divs(int opcode)
{
IOperand op = cpu.ResolveSrcEA((opcode >> 3) & 0x07, (opcode & 0x07), Size.Word);
int s = op.GetWordSigned();
int reg = (opcode >> 9) & 0x07;
int d = cpu.GetDataRegisterLong(reg);
int time;
if (s == 0)
{
cpu.RaiseException(5);
time = 38 + op.GetTiming();
}
else
{
int quot = d / s;
if (quot > 32767 || quot < -32768)
{
cpu.SetFlags(cpu.VFlag);
}
else
{
int remain = (d % s) & 0xffff;
int result = (quot & 0x0000ffff) | (remain << 16);
cpu.SetDataRegisterLong(reg, result);
if ((quot & 0x8000) != 0)
{
cpu.SetFlags(cpu.NFlag);
cpu.ClrFlags(cpu.ZFlag);
}
else
{
cpu.ClrFlags(cpu.NFlag);
if (quot == 0)
{
cpu.SetFlags(cpu.ZFlag);
}
else
{
cpu.ClrFlags(cpu.ZFlag);
}
}
cpu.ClrFlags((cpu.VFlag | cpu.CFlag));
}
time = 158 + op.GetTiming();
}
return(time);
}
protected int Muls(int opcode)
{
IOperand op = cpu.ResolveSrcEA((opcode >> 3) & 0x07, (opcode & 0x07), Size.Word);
int s = op.GetWordSigned();
int reg = (opcode >> 9) & 0x07;
int d = cpu.GetDataRegisterWord(reg);
if ((d & 0x8000) == 0x8000)
{
d |= -65536;
}
int r = s * d;
if (r < 0)
{
cpu.SetFlags(cpu.NFlag);
}
else
{
cpu.ClrFlags(cpu.NFlag);
}
if (r == 0)
{
cpu.SetFlags(cpu.ZFlag);
}
else
{
cpu.ClrFlags(cpu.ZFlag);
}
cpu.ClrFlags((cpu.VFlag | cpu.CFlag));
cpu.SetDataRegisterLong(reg, r);
int last_bit = 0;
int val;
int count = 0;
for (int x = 0; x < 16; x++)
{
val = s & 1;
if (val != last_bit)
{
count++;
}
last_bit = val;
s >>= 1;
}
return(38 + (count << 1));
}
protected int SubWordDnDest(int opcode)
{
IOperand src = cpu.ResolveSrcEA((opcode >> 3) & 0x07, opcode & 0x07, Size.Word);
int s = src.GetWordSigned();
int reg = (opcode >> 9) & 0x07;
int d = cpu.GetDataRegisterWordSigned(reg);
int r = d - s;
cpu.SetDataRegisterWord(reg, r);
int time = 4 + src.GetTiming();
cpu.CalcFlags(InstructionType.SUB, s, d, r, Size.Word);
return(time);
}
