// Contract: BRONWYN
// Target function: function div (bytes16 x, bytes16 y) internal pure returns (bytes16)
421 - exponent;
      exponent = 0;
    } else {
      significand >>= 60;
      exponent -= 15360;
    }

    uint64 result = uint64 (significand | exponent << 52);
    if (negative) result |= 0x8000000000000000;

    return bytes8 (result);
  }

  /**
   * Test whether given quadruple precision number is NaN.
   *
   * @param x quadruple precision number
   * @return true if x is NaN, false otherwise
   */
  function isNaN (bytes16 x) internal pure returns (bool) {
    return uint128 (x) & 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF >
      0x7FFF0000000000000000000000000000;
  }

  /**
   * Test whether given quadruple precision number is positive or negative
   * infinity.
   *
   * @param x quadruple precision number
   * @return true if x is positive or negative infinity, false otherwise
   */
  function isInfinity (bytes16 x) internal pure returns (bool) {
    return uint128 (x) & 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF ==
      0x7FFF0000000000000000000000000000;
  }

  /**
   * Calculate sign of x, i.e. -1 if x is negative, 0 if x if zero, and 1 if x
   * is positive.  Note that sign (-0) is zero.  Revert if x is NaN. 
   *
   * @param x quadruple precision number
   * @return sign of x
   */
  function sign (bytes16 x) internal pure returns (int8) {
    uint128 absoluteX = uint128 (x) & 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;

    require (absoluteX <= 0x7FFF0000000000000000000000000000); // Not NaN

    if (absoluteX == 0) return 0;
    else if (uint128 (x) >= 0x80000000000000000000000000000000) return -1;
    else return 1;
  }

  /**
   * Calculate sign (x - y).  Revert if either argument is NaN, or both
   * arguments are infinities of the same sign. 
   *
   * @param x quadruple precision number
   * @param y quadruple precision number
   * @return sign (x - y)
   */
  function cmp (bytes16 x, bytes16 y) internal pure returns (int8) {
    uint128 absoluteX = uint128 (x) & 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;

    require (absoluteX <= 0x7FFF0000000000000000000000000000); // Not NaN

    uint128 absoluteY = uint128 (y) & 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;

    require (absoluteY <= 0x7FFF0000000000000000000000000000); // Not NaN

    // Not infinities of the same sign
    require (x != y || absoluteX < 0x7FFF0000000000000000000000000000);

    if (x == y) return 0;
    else {
      bool negativeX = uint128 (x) >= 0x80000000000000000000000000000000;
      bool negativeY = uint128 (y) >= 0x80000000000000000000000000000000;

      if (negativeX) {
        if (negativeY) return absoluteX > absoluteY ? -1 : int8 (1);
        else return -1; 
      } else {
        if (negativeY) return 1;
        else return absoluteX > absoluteY ? int8 (1) : -1;
      }
    }
  }

  /**
   * Test whether x equals y.  NaN, infinity, and -infinity are not equal to
   * anything. 
   *
   * @param x quadruple precision number
   * @param y quadruple precision number
   * @return true if x equals to y, false otherwise
   */
  function eq (bytes16 x, bytes16 y) internal pure returns (bool) {
    if (x == y) {
      return uint128 (x) & 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF <
        0x7FFF0000000000000000000000000000;
    } else return false;
  }

  /**
   * Calculate x + y.  Special values behave in the following way:
   *
   * NaN + x = NaN for any x.
   * Infinity + x = Infinity for any finite x.
   * -Infinity + x = -Infinity for any finite x.
   * Infinity + Infinity = Infinity.
   * -Infinity + -Infinity = -Infinity.
   * Infinity + -Infinity = -Infinity + Infinity = NaN.
   *
   * @param x quadruple precision number
   * @param y quadruple precision number
   * @return quadruple precision number
   */
  function add (bytes16 x, bytes16 y) internal pure returns (bytes16) {
    uint256 xExponent = uint128 (x) >> 112 & 0x7FFF;
    uint256 yExponent = uint128 (y) >> 112 & 0x7FFF;

    if (xExponent == 0x7FFF) {
      if (yExponent == 0x7FFF) { 
        if (x == y) return x;
        else return NaN;
      } else return x; 
    } else if (yExponent == 0x7FFF) return y;
    else {
      bool xSign = uint128 (x) >= 0x80000000000000000000000000000000;
      uint256 xSignifier = uint128 (x) & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
      if (xExponent == 0) xExponent = 1;
      else xSignifier |= 0x10000000000000000000000000000;

      bool ySign = uint128 (y) >= 0x80000000000000000000000000000000;
      uint256 ySignifier = uint128 (y) & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
      if (yExponent == 0) yExponent = 1;
      else ySignifier |= 0x10000000000000000000000000000;

      if (xSignifier == 0) return y == NEGATIVE_ZERO ? POSITIVE_ZERO : y;
      else if (ySignifier == 0) return x == NEGATIVE_ZERO ? POSITIVE_ZERO : x;
      else {
        int256 delta = int256 (xExponent) - int256 (yExponent);
  
        if (xSign == ySign) {
          if (delta > 112) return x;
          else if (delta > 0) ySignifier >>= uint256 (delta);
          else if (delta < -112) return y;
          else if (delta < 0) {
            xSignifier >>= uint256 (-delta);
            xExponent = yExponent;
          }
  
          xSignifier += ySignifier;
  
          if (xSignifier >= 0x20000000000000000000000000000) {
            xSignifier >>= 1;
            xExponent += 1;
          }
  
          if (xExponent == 0x7FFF)
            return xSign ? NEGATIVE_INFINITY : POSITIVE_INFINITY;
          else {
            if (xSignifier < 0x10000000000000000000000000000) xExponent = 0;
            else xSignifier &= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
  
            return bytes16 (uint128 (
                (xSign ? 0x80000000000000000000000000000000 : 0) |
                (xExponent << 112) |
                xSignifier)); 
          }
        } else {
          if (delta > 0) {
            xSignifier <<= 1;
            xExponent -= 1;
          } else if (delta < 0) {
            ySignifier <<= 1;
            xExponent = yExponent - 1;
          }

          if (delta > 112) ySignifier = 1;
          else if (delta > 1) ySignifier = (ySignifier - 1 >> uint256 (delta - 1)) + 1;
          else if (delta < -112) xSignifier = 1;
          else if (delta < -1) xSignifier = (xSignifier - 1 >> uint256 (-delta - 1)) + 1;

          if (xSignifier >= ySignifier) xSignifier -= ySignifier;
          else {
            xSignifier = ySignifier - xSignifier;
            xSign = ySign;
          }

          if (xSignifier == 0)
            return POSITIVE_ZERO;

          uint256 msb = msb (xSignifier);

          if (msb == 113) {
            xSignifier = xSignifier >> 1 & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
            xExponent += 1;
          } else if (msb < 112) {
            uint256 shift = 112 - msb;
            if (xExponent > shift) {
              xSignifier = xSignifier << shift & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
              xExponent -= shift;
            } else {
              xSignifier <<= xExponent - 1;
              xExponent = 0;
            }
          } else xSignifier &= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFF;

          if (xExponent == 0x7FFF)
            return xSign ? NEGATIVE_INFINITY : POSITIVE_INFINITY;
          else return bytes16 (uint128 (
              (xSign ? 0x80000000000000000000000000000000 : 0) |
              (xExponent << 112) |
              xSignifier));
        }
      }
    }
  }

  /**
   * Calculate x - y.  Special values behave in the following way:
   *
   * NaN - x = NaN for any x.
   * Infinity - x = Infinity for any finite x.
   * -Infinity - x = -Infinity for any finite x.
   * Infinity - -Infinity = Infinity.
   * -Infinity - Infinity = -Infinity.
   * Infinity - Infinity = -Infinity - -Infinity = NaN.
   *
   * @param x quadruple precision number
   * @param y quadruple precision number
   * @return quadruple precision number
   */
  function sub (bytes16 x, bytes16 y) internal pure returns (bytes16) {
    return add (x, y ^ 0x80000000000000000000000000000000);
  }

  /**
   * Calculate x * y.  Special values behave in the following way:
   *
   * NaN * x = NaN for any x.
   * Infinity * x = Infinity for any finite positive x.
   * Infinity * x = -Infinity for any finite negative x.
   * -Infinity * x = -Infinity for any finite positive x.
   * -Infinity * x = Infinity for any finite negative x.
   * Infinity * 0 = NaN.
   * -Infinity * 0 = NaN.
   * Infinity * Infinity = Infinity.
   * Infinity * -Infinity = -Infinity.
   * -Infinity * Infinity = -Infinity.
   * -Infinity * -Infinity = Infinity.
   *
   * @param x quadruple precision number
   * @param y quadruple precision number
   * @return quadruple precision number
   */
  function mul (bytes16 x, bytes16 y) internal pure returns (bytes16) {
    uint256 xExponent = uint128 (x) >> 112 & 0x7FFF;
    uint256 yExponent = uint128 (y) >> 112 & 0x7FFF;

    if (xExponent == 0x7FFF) {
      if (yExponent == 0x7FFF) {
        if (x == y) return x ^ y & 0x80000000000000000000000000000000;
        else if (x ^ y == 0x80000000000000000000000000000000) return x | y;
        else return NaN;
      } else {
        if (y & 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF == 0) return NaN;
        else return x ^ y & 0x80000000000000000000000000000000;
      }
    } else if (yExponent == 0x7FFF) {
        if (x & 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF == 0) return NaN;
        else return y ^ x & 0x80000000000000000000000000000000;
    } else {
      uint256 xSignifier = uint128 (x) & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
      if (xExponent == 0) xExponent = 1;
      else xSignifier |= 0x10000000000000000000000000000;

      uint256 ySignifier = uint128 (y) & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
      if (yExponent == 0) yExponent = 1;
      else ySignifier |= 0x10000000000000000000000000000;

      xSignifier *= ySignifier;
      if (xSignifier == 0)
        return (x ^ y) & 0x80000000000000000000000000000000 > 0 ?
            NEGATIVE_ZERO : POSITIVE_ZERO;

      xExponent += yExponent;

      uint256 msb =
        xSignifier >= 0x200000000000000000000000000000000000000000000000000000000 ? 225 :
        xSignifier >= 0x100000000000000000000000000000000000000000000000000000000 ? 224 :
        msb (xSignifier);

      if (xExponent + msb < 16496) { // Underflow
        xExponent = 0;
        xSignifier = 0;
      } else if (xExponent + msb < 16608) { // Subnormal
        if (xExponent < 16496)
          xSignifier >>= 16496 - xExponent;
        else if (xExponent > 16496)
          xSignifier <<= xExponent - 16496;
        xExponent = 0;
      } else if (xExponent + msb > 49373) {
        xExponent = 0x7FFF;
        xSignifier = 0;
      } else {
        if (msb > 112)
          xSignifier >>= msb - 112;
        else if (msb < 112)
          xSignifier <<= 112 - msb;

        xSignifier &= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFF;

        xExponent = xExponent + msb - 16607;
      }

      return bytes16 (uint128 (uint128 ((x ^ y) & 0x80000000000000000000000000000000) |
          xExponent << 112 | xSignifier));
    }
  }