docs: public static double log2_c11(double x)
      {
          if(x < 0)
              return Double.NaN;
          long rawBits = doubleToLongBits(x);
          long mantissa = getMantissa(rawBits);
          int e = Math.getExponent(x);
          
          return log2Cache11[(int)(mantissa >>> (52-11))] + e;
      }