JSBool
js_math_max(JSContext *cx, uintN argc, Value *vp)
{
    jsdouble x, z = js_NegativeInfinity;
    Value *argv;
    uintN i;

    if (argc == 0) {
        vp->setDouble(js_NegativeInfinity);
        return JS_TRUE;
    }
    argv = vp + 2;
    for (i = 0; i < argc; i++) {
        if (!ValueToNumber(cx, argv[i], &x))
            return JS_FALSE;
        if (JSDOUBLE_IS_NaN(x)) {
            vp->setDouble(js_NaN);
            return JS_TRUE;
        }
        if (x == 0 && x == z) {
            if (js_copysign(1.0, z) == -1)
                z = x;
        } else {
            z = (x > z) ? x : z;
        }
    }
    vp->setNumber(z);
    return JS_TRUE;
}