toFloatingPointValue method

Implementation

FloatingPointValue toFloatingPointValue() {
  final exact = toScaledBigInt();
  if (exact.significand == BigInt.zero) {
    return FloatingPointValue.populator(exponentWidth: 2, mantissaWidth: 1)
        .ofScaledBigInt(BigInt.zero, 0);
  }

  var significand = exact.significand;
  var exponent = exact.exponent;
  while (significand.isEven) {
    significand >>= 1;
    exponent++;
  }

  final magnitudeWidth = significand.abs().bitLength;
  final valueExponent = exponent + magnitudeWidth - 1;
  var exponentWidth = 2;
  while (valueExponent < -(BigInt.one << (exponentWidth - 1)).toInt() + 2 ||
      valueExponent > (BigInt.one << (exponentWidth - 1)).toInt() - 1) {
    exponentWidth++;
  }
  return FloatingPointValue.populator(
          exponentWidth: exponentWidth,
          mantissaWidth: max(1, magnitudeWidth - 1))
      .ofScaledBigInt(significand, exponent);
}