code: def gcd_bit(a, b):
      """Similar to gcd but uses bitwise operators and less error handling."""
      tza = trailing_zero(a)
      tzb = trailing_zero(b)
      a >>= tza
      b >>= tzb
      while b:
          if a < b:
              a, b = b, a
          a -= b
          a >>= trailing_zero(a)
      return a << min(tza, tzb)
  
label_desc: Use image node_id 4 for calling a global function with example usage: gcd_bit(a, b) and returns: unknown