int foo(int N, int* a) {
    int i; // Place i in $s0
    int x = N; // Place x in $s1
    for(i = 256; i != 0; i /= 4) {
        x = bar(i & x, a[i]) - 13;
        if(N > x) {
            a[i] = x;
        }
    }
    return x;
}