tidb math 代码
文件路径：/br/pkg/utils/math.go
/ 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
}