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

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Koriolis
 #1
Indeed, you need to rplace "square root" with "base 2 logarithm".
This would give:
Const LOG2# = 0.69314718055994529
Function BPo2:Int(v:Int)
	Return 1 Shl Int(Ceil(Log(v)/LOG2))
End Function
But this is clearly slower.