protected int CmpiByte(int opcode)
{
int s = CpuUtils.SignExtendByte(cpu.FetchPCWord());
IOperand op = cpu.ResolveDstEA((opcode >> 3) & 0x07, (opcode & 0x07), Size.Byte);
int d = op.GetByteSigned();
int r = d - s;
cpu.CalcFlags(InstructionType.CMP, s, d, r, Size.Byte);
return(op.IsRegisterMode() ? 8 : 8 + op.GetTiming());
}
protected int SubiByte(int opcode)
{
int s = CpuUtils.SignExtendByte(cpu.FetchPCWord());
IOperand dst = cpu.ResolveDstEA((opcode >> 3) & 0x07, opcode & 0x07, Size.Byte);
int d = dst.GetByteSigned();
int r = d - s;
dst.SetByte(r);
cpu.CalcFlags(InstructionType.SUB, s, d, r, Size.Byte);
return(dst.IsRegisterMode() ? 8 : 12 + dst.GetTiming());
}
protected int SubByteEaDest(int opcode)
{
int s = cpu.GetDataRegisterByteSigned((opcode >> 9) & 0x07);
IOperand dst = cpu.ResolveDstEA((opcode >> 3) & 0x07, opcode & 0x07, Size.Byte);
int d = dst.GetByteSigned();
int r = d - s;
dst.SetByte(r);
int time = 8 + dst.GetTiming();
cpu.CalcFlags(InstructionType.SUB, s, d, r, Size.Byte);
return(time);
}
protected int SubByteDnDest(int opcode)
{
IOperand src = cpu.ResolveSrcEA((opcode >> 3) & 0x07, opcode & 0x07, Size.Byte);
int s = src.GetByteSigned();
int reg = (opcode >> 9) & 0x07;
int d = cpu.GetDataRegisterByteSigned(reg);
int r = d - s;
cpu.SetDataRegisterByte(reg, r);
int time = 4 + src.GetTiming();
cpu.CalcFlags(InstructionType.SUB, s, d, r, Size.Byte);
return(time);
}
protected int SubqByte(int opcode)
{
int s = (opcode >> 9 & 0x07);
if (s == 0)
{
s = 8;
}
IOperand dst = cpu.ResolveDstEA((opcode >> 3) & 0x07, (opcode & 0x07), Size.Byte);
int d = dst.GetByteSigned();
int r = d - s;
dst.SetByte(r);
cpu.CalcFlags(InstructionType.SUB, s, d, r, Size.Byte);
return(dst.IsRegisterMode() ? 4 : 8 + dst.GetTiming());
}