anchor.diff:      case Exp >= 0 of
           true ->
               BExp = 1 bsl Exp,
  -            case (Frac /= ?BIG_POW) of
  +            case (Frac =/= ?BIG_POW) of
                   true ->
                       scale((Frac * BExp * 2), 2, BExp, BExp,
                             Round, Round, Float);
  
positive.code:                           Round, Round, Float)
              end;
          false ->
              case (Exp == ?MIN_EXP) orelse (Frac /= ?BIG_POW) of
                  true ->
                      scale((Frac * 2), 1 bsl (1 - Exp), 1, 1,
                            Round, Round, Float);
  
negative.code:         _ ->
              R
      end.
  
  %% @spec frexp(F::float()) -> {Frac::float(), Exp::float()}
  %% @doc  Return the fractional and exponent part of an IEEE 754 double,
  %%       equivalent to the libc function of the same name.
  