3/6_control/25_while_guard.c


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//  %rdi <- a
//  %rsi <- b
//  loop:
//    testq %rsi, %rsi
//    jle   .L8
long loop_while2(long a, long b) {
    long result = b;
    while (b > 0) {
        result = result * a;
        b = b - a;
    }
    return result;
}