mirror of
https://github.com/ergochat/ergo.git
synced 2024-11-22 20:09:41 +01:00
17 lines
357 B
Go
17 lines
357 B
Go
|
// Copyright (c) 2020 Shivaram Lingamneni <slingamn@cs.stanford.edu>
|
||
|
|
// released under the MIT license
|
||
|
|
|
||
|
|
package utils
|
||
|
|
|
||
|
|
// return n such that v <= n and n == 2**i for some i
|
||
|
|
func RoundUpToPowerOfTwo(v int) int {
|
||
|
|
// http://graphics.stanford.edu/~seander/bithacks.html
|
||
|
|
v -= 1
|
||
|
|
v |= v >> 1
|
||
|
|
v |= v >> 2
|
||
|
|
v |= v >> 4
|
||
|
|
v |= v >> 8
|
||
|
|
v |= v >> 16
|
||
|
|
return v + 1
|
||
|
|
}
|