func math/bits.Len64

7 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) {

	crypto/internal/hpke
		hpke.go#L251: 	return bits.Len64(u.hi) + bits.Len64(u.lo)

	crypto/x509
		oid.go#L77: 	return (bits.Len64(n) + 6) / 7

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