Function Subtract

src/cryptlib/integer.cpp:156–171

}

static word Subtract(word *C, const word *A, const word *B, unsigned int N)
{
    assert (N%2 == 0);

    word borrow=0;
    for (unsigned i = 0; i < N; i+=2)
    {
        dword_union u;
                u.dw = (dword) A[i] - B[i] - borrow;
        C[i] = u.low;
        u.dw = (dword) A[i+1] - B[i+1] - (word)(0-u.high);
        C[i+1] = u.low;
        borrow = 0-u.high;
    }
    return borrow;
}

#endif  // defined(_MSC_VER) && defined(_M_IX86) && (_M_IX86<=500)