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32 lines
552 B
Go
32 lines
552 B
Go
package mathutil
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// IntegerSquareRoot defines a function that returns the
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// largest possible integer root of a number.
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func IntegerSquareRoot(n uint64) uint64 {
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x := n
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y := (x + 1) / 2
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for y < x {
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x = y
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y = (x + n/x) / 2
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}
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return x
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}
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// CeilDiv8 divides the input number by 8
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// and takes the ceiling of that number.
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func CeilDiv8(n int) int {
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ret := n / 8
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if n%8 > 0 {
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ret++
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}
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return ret
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}
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// IsPowerOf2 returns true if n is an
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// exact power of two. False otherwise.
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func IsPowerOf2(n uint64) bool {
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return (n & (n - 1)) == 0
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}
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