what's the easiest way to round up to power of 2?

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Function p:Int( n:Int )
	n :- 1
	n :| (n Shr 1)
	n :| (n Shr 2)
	n :| (n Shr 4)
	n :| (n Shr 8)
	n :| (n Shr 16)
	Return n+1
End Function