static int int_max(int a, int b) {
    b = a-b;
    a -= b & (b>>31);
    return a;
}

static int int_min(int a, int b) {
    b = b-a;
    a += b & (b>>31);
    return a;
}
 
static int int_abs(int a) {
    return a - ((a+a) & (a>>31));
}

static int int_abs2(int x) {
    int y;
    y = x>>31;    /* Not portable */
    return (x^y)-y;
}