void Interpreter::JME(const Instruction & instruction)
{
UInt16 xVal = mCPU.DumpRegister(instruction.GetFirstOperand());
UInt16 yVal = mCPU.DumpRegister(instruction.GetSecondOperand());
if(xVal == yVal)
mErrorCode = mCPU.SetProgramCounter(instruction.GetImmediateValue());
}
void Interpreter::BasicUnaryArithmetic(const Instruction & instruction,
std::function<UInt16(UInt16)> ins)
{
UInt16 val = mCPU.DumpRegister(instruction.GetSecondOperand());
mErrorCode = mCPU.SetRegister(instruction.GetFirstOperand(), ins(val));
mCPU.SetSignZeroFlag(mCPU.DumpRegister(instruction.GetFirstOperand()));
}
void Interpreter::IndirectLDM(const Instruction & instruction)
{
UInt8 addrX = instruction.GetFirstOperand();
UInt8 addrY = instruction.GetSecondOperand();
UInt16 val;
mErrorCode = mCPU.Load(mCPU.DumpRegister(addrY), val);
mErrorCode = mCPU.SetRegister(addrX, val);
}
void Interpreter::DiscardBinaryArithmetic(const Instruction & instruction,
std::function<UInt16(UInt16,UInt16)> ins,
std::function<void(UInt16,UInt16)> frh)
{
UInt16 xVal = mCPU.DumpRegister(instruction.GetFirstOperand());
UInt16 yVal = mCPU.DumpRegister(instruction.GetSecondOperand());
if (frh)
frh(xVal, yVal);
UInt16 result = ins(xVal, yVal);
mCPU.SetSignZeroFlag(result);
}
void Interpreter::InplaceBinaryArithmetic(const Instruction & instruction,
std::function<UInt16(UInt16,UInt16)> ins,
std::function<void(UInt16,UInt16)> frh)
{
UInt8 xReg = instruction.GetFirstOperand();
UInt16 xVal = mCPU.DumpRegister(xReg);
UInt16 yVal = mCPU.DumpRegister(instruction.GetSecondOperand());
if (frh)
frh(xVal, yVal);
mErrorCode = mCPU.SetRegister(xReg, ins(xVal, yVal));
mCPU.SetSignZeroFlag(mCPU.DumpRegister(xReg));
}
void Interpreter::IndirectSTM(const Instruction & instruction)
{
UInt16 xVal = mCPU.DumpRegister(instruction.GetFirstOperand());
UInt16 yVal = mCPU.DumpRegister(instruction.GetSecondOperand());
mErrorCode = mCPU.Store(yVal, xVal);
}
void Interpreter::RegisterSAR(const Instruction & instruction)
{
UInt8 addr = instruction.GetFirstOperand();
mErrorCode = mCPU.SetRegister(addr, ArithmeticRightShift()(mCPU.DumpRegister(addr), mCPU.DumpRegister(instruction.GetSecondOperand())));
mCPU.SetSignZeroFlag(mCPU.DumpRegister(addr));
}
void Interpreter::MOV(const Instruction & instruction)
{
UInt8 addrX = instruction.GetFirstOperand();
UInt16 yVal = mCPU.DumpRegister(instruction.GetSecondOperand());
mErrorCode = mCPU.SetRegister(addrX, yVal);
}