// Copyright 2020 PingCAP, Inc. Licensed under Apache-2.0.

package utils

// NextPowerOfTwo returns the smallest power of two greater than or equal to `i`
// Caller should guarantee that i > 0 and the return value is not overflow.
func NextPowerOfTwo(i int64) int64 {
	if i&(i-1) == 0 {
		return i
	}
	i *= 2
	for i&(i-1) != 0 {
		i &= i - 1
	}
	return i
}