quo, _ := bits.Div64(hi, lo, uint64(queryPerformanceFrequency))
	return time.Duration(quo)
}

var queryPerformanceFrequency int64

// highPrecisionTimeSince returns duration since a.
func highPrecisionTimeSince(a highPrecisionTime) time.Duration {
	return highPrecisionTimeNow().sub(a)

}

// highPrecisionTimeNow returns high precision time for benchmarking.
func highPrecisionTimeNow() highPrecisionTime {
	return highPrecisionTime{now: time.Now()}
}

// highPrecisionTimeSince returns duration since b.
func highPrecisionTimeSince(b highPrecisionTime) time.Duration {
	return time.Since(b.now)