func math/bits.Len64

4 uses

	math/bits (current package)
		bits.go#L37: func LeadingZeros64(x uint64) int { return 64 - Len64(x) }
		bits.go#L306: 	return Len64(uint64(x))
		bits.go#L337: func Len64(x uint64) (n int) {

	strconv
		ftoaryu.go#L101: 	if b := bits.Len64(mant); b < 55 {

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