// WITH_STDLIB
// TARGET_BACKEND: JS_IR
// FILE: main.js
Math.clz32 = function clz32(x) {
    clz32.called = true;
    var asUint = x >>> 0;
    if (asUint === 0) {
        return 32;
    }
    return 31 - (Math.log(asUint) / Math.LN2 | 0) | 0; // the "| 0" acts like math.floor
}

// FILE: main.kt
fun box(): String {
    val result = 4.countLeadingZeroBits()

    assertEquals(result, 29)
    assertEquals(js("Math.clz32.called"), true)

    return "OK"
}