func math/bits.Len

4 uses

	math/bits (current package)
		bits.go#L19: func LeadingZeros(x uint) int { return UintSize - Len(x) }
		bits.go#L296: func Len(x uint) int {

	math/big
		nat.go#L824: 	recDepth := 2 * bits.Len(uint(len(v)))
		nat.go#L969: 		return i*_W + bits.Len(uint(x[i]))

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