alu add int

int in_a = 1250;
int in_b = -4025;
int res = 0;

in.op = ALU::OpAdd;
in.ci = false;

for(unsigned i=0; i<32/4; ++i)
{
    unsigned shift = i << 2;
    in.a = (in_a >> shift) & 0xF;
    in.b = (in_b >> shift) & 0xF;

    auto out = alu.simulate(in);
    res |= (out.out << shift);
    in.ci = out.co;
}