unsigned int executeAlu(statusType stat)
{
unsigned int a = getAluA();
unsigned int b = getAluB();
unsigned int fun = getAluFun();
unsigned int result = 0;
switch (fun)
{
case FADDL:
result = a + b;
break;
case FSUBL:
result = b - a;
break;
case FANDL:
result = a & b;
break;
case FXORL:
result = a ^ b;
break;
}
if (needToSetCC(stat))
{
unsigned int isZero = result == 0;
unsigned int isSigned = isNegative(result);
unsigned int isOverflow = 0;
if (fun == FADDL)
{
isOverflow = (isNegative(a) == isNegative(b)) &&
(isNegative(result) != isNegative(a));
}
else if (fun == FSUBL)
{
isOverflow = (isNegative(a) != isNegative(b)) &&
(isNegative(result) == isNegative(a));
}
setCC(ZF, isZero);
setCC(SF, isSigned);
setCC(OF, isOverflow);
}
return result;
}
void Channel::initCtrl()
{
key_pressure = 0;
channel_pressure = 0;
pitch_bend = 0x2000; // Range is 0x4000, pitch bend wheel starts in centered position
pitch_wheel_sensitivity = 12; /* twelve semi-tones */
bank_msb = 0;
for (int i = 0; i < GEN_LAST; i++) {
gen[i] = 0.0f;
gen_abs[i] = 0;
}
for (int i = 0; i < 128; i++)
setCC(i, 0);
/* Volume / initial attenuation (MSB & LSB) */
setCC(VOLUME_MSB, 127);
setCC(VOLUME_LSB, 0);
/* Pan (MSB & LSB) */
setCC(PAN_MSB, 64);
setCC(PAN_LSB, 64);
/* Expression (MSB & LSB) */
setCC(EXPRESSION_MSB, 127);
setCC(EXPRESSION_LSB, 127);
}
// Function: performOpl
// Description: performs the instruction
// Params: statusType status
// Returns: result (e_valE)
// Modifies: set_cc and result (local)
unsigned int performOpl(statusType status)
{
bool set_cc = true;
if(status.m_stat == SADR || status.m_stat == SINS || status.m_stat == SHLT ||
status.W_stat == SADR || status.W_stat == SINS || status.W_stat == SHLT
){
set_cc = false;
}
int a = (int) E.valA;//cast to int because its unsigned
int b = (int) E.valB;
int result = 0;
// The CC register is cleared before every OPL
if(set_cc){
clearCC();
}
// perform addl
if (E.ifun == 0 && set_cc)//THIS USE TO == ADDL WTF?
{
result = b + a;
if (result == 0 && set_cc)
setCC(ZF, 1);
if (result < 0 && set_cc)
setCC(SF, 1);
if (((a < 0) == (b < 0)) && ((result < 0) != (a < 0)) && set_cc)
setCC(OF, 1);
}
else if(E.ifun == 1 && set_cc) //made this an else if instead of if
{
result = b - a;
if(result == 0 && set_cc)
{
setCC(ZF, 1);
}
if(result < 0 && set_cc)
{
setCC(SF, 1);
}
if((((a > 0) != (b > 0))) && ((result > 0) == (a > 0)) && set_cc)
{
setCC(OF, 1);
}
}
else if(E.ifun == 2 && set_cc) //made else
{
result = b & a;
if(result == 0 && set_cc)
{
setCC(ZF, 1);
}
if(result < 0 && set_cc)
{
setCC(SF, 1);
}
}
else //use to be an if, switched it to an else. now its 13/17
{
result = b ^ a;
if(result == 0 && set_cc)
{
setCC(ZF, 1);
}
if(result < 0 && set_cc)
{
setCC(SF, 1);
}
}
if(!set_cc){
setCC(ZF, 0);
setCC(SF, 0);
setCC(OF, 0);
}
return result;
}
