void Unsigned::Subtract(Unsigned& b)
{
assert(_width == b.Width());
Unsigned one_val(b.Width(),"_b1");
Unsigned tmp(b.Width());
tmp = b;
tmp.Complement();
tmp.Add(one_val);
this->Add(tmp);
}
void Unsigned::Multiply(Unsigned& b )
{
assert(this->_width == b.Width());
if(b.Width() > 64)
{
cerr << "Error: multiply supported for integers which are up to 64 bits wide" << endl;
cerr << " will return junk " << endl;
return;
}
this->_bit_field[0] = this->_bit_field[0] * b._bit_field[0];
}
void Unsigned::Concatenate(Unsigned& b)
{
Unsigned tmp(_width + b._width);
for(int idx = 0; idx < b.Width(); idx++)
{
tmp.Set_Bit(idx, (b.Get_Bit(idx) ? true : false));
}
for(int idx = 0; idx < this->_width; idx++)
{
tmp.Set_Bit(idx + b.Width(), (this->Get_Bit(idx) ? true : false));
}
this->Swap(tmp);
}
void Unsigned::Add(Unsigned& b)
{
bool carry = false;
assert(this->_width == b.Width());
for(int idx = 0; idx < b.Width(); idx++)
{
bool abit = this->Get_Bit(idx);
bool bbit = b.Get_Bit(idx);
bool sum = (abit ^ bbit ^ carry);
this->Set_Bit(idx,sum);
carry = (abit & bbit) | ((abit | bbit) & carry);
}
this->Sign_Extend();
}
void Unsigned::Divide(Unsigned& b)
{
assert(_width == b.Width());
if(_width > 64)
{
cerr << "Error: divide supported for integers which are up to 64 bits wide" << endl;
cerr << " will return junk " << endl;
return;
}
this->_bit_field[0] = this->_bit_field[0] / b._bit_field[0];
}
bool Unsigned::Greater(Unsigned& b)
{
bool ret_val = true;
assert(this->Width() == b.Width());
for(int idx = this->Width()-1; idx >= 0; idx--)
{
if((!this->Get_Bit(idx) && b.Get_Bit(idx)))
{
ret_val = false;
break;
}
else if(this->Get_Bit(idx) && !b.Get_Bit(idx))
break;
}
return(ret_val);
}
void Unsigned::Xor(Unsigned& b)
{
assert(this->Width() == b.Width());
for(int idx = 0; idx < this->Array_Size(); idx++)
this->_bit_field[idx] = (this->_bit_field[idx] ^ b._bit_field[idx]);
}