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What is the following function doing?

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unsigned fun(unsigned a, unsigned b)
{
    int i;
    unsigned j = 0;
    for(i = 0; i < 32; i++)
    {
        j <<= 1;
        j += !!(a & 0x80000000);
        a <<= 1;
        if(j >=b)
        {
            j -= b;
            a++;
        }
    }
    return a;
}

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