c_exp c_exp::conversionTo(DataType outType) const {
QString inCode = code();
DataType inType = type();
QString outCode;
if (outType.isFloat()) {
if (inType.isFloat()) {
outCode = inCode;
} else if (inType.isAFP()) {
if (inType.afpPrecision() >= 0) {
outCode = "(float)(" + inCode + ") / " + QString::number(1 << inType.afpPrecision());
} else {
outCode = "(float)(" + inCode + ") * " + QString::number(1 << (-inType.afpPrecision()));
}
} else if (inType.isInt()) {
outCode = "(float)(" + inCode + ")";
} else {
outCode = inCode; // error condition
}
} else if (outType.isAFP()) {
if (inType.isFloat()) {
if (outType.afpPrecision() >= 0) {
outCode = "(int)(" + inCode + " * 1.6 * (1 << " + QString::number(outType.afpPrecision()) + "))";
} else {
outCode = "(int)(" + inCode + " * 1.6 / (1 << " + QString::number(-outType.afpPrecision()) + "))";
}
} else if (inType.isAFP()) {
int numLeftShifts = outType.afpPrecision() - inType.afpPrecision();
if (numLeftShifts > 0) {
outCode = "(" + inCode + ") << " + QString::number(numLeftShifts);
} else {
outCode = "(" + inCode + ") >> " + QString::number(-numLeftShifts);
}
} else if (inType.isInt()) {
if (outType.afpPrecision() >= 0) {
outCode = "(" + inCode + ") << " + QString::number(outType.afpPrecision());
} else {
outCode = "(" + inCode + ") >> " + QString::number(-(outType.afpPrecision()));
}
} else {
outCode = inCode; // error condition
}
} else if (outType.isInt()) {
if (inType.isFloat()) {
return c_exp(); // error condition
} else if (inType.isAFP()) {
return c_exp(); // error condition
} else if (inType.isInt()) {
outCode = inCode;
} else {
outCode = inCode; // error condition
}
}
return c_exp(outCode, outType);
}
DataType moreGeneralType(DataType a, DataType b) {
if (a.isFloat() || b.isFloat()) {
return DATATYPE_FLOAT;
} else if (a.isAFP() && b.isAFP()) {
return DATATYPE_AFP(qMin(a.afpPrecision(), b.afpPrecision()));
} else if (a.isAFP()) {
return DATATYPE_AFP(a.afpPrecision());
} else if (b.isAFP()) {
return DATATYPE_AFP(b.afpPrecision());
} else {
return DATATYPE_INT;
}
}
