//go:nosplit
func (bt *bintime) Add(bt2 *bintime) {
	u := bt.frac
	bt.frac += bt2.frac
	if u > bt.frac {
		bt.sec++
	}
	bt.sec += bt2.sec
}

//go:nosplit
func (bt *bintime) AddX(x uint64) {
	u := bt.frac
	bt.frac += x
	if u > bt.frac {
		bt.sec++
	}
}

var (
	// binuptimeDummy is used in binuptime as the address of an atomic.Load, to simulate