public static bool TryRunHalf(Half value, int requestedDigits, ref NumberBuffer number)
{
Half v = Half.IsNegative(value) ? Half.Negate(value) : value;
Debug.Assert((double)v > 0);
Debug.Assert(Half.IsFinite(v));
int length;
int decimalExponent;
bool result;
if (requestedDigits == -1)
{
DiyFp w = DiyFp.CreateAndGetBoundaries(v, out DiyFp boundaryMinus, out DiyFp boundaryPlus).Normalize();
result = TryRunShortest(in boundaryMinus, in w, in boundaryPlus, number.Digits, out length, out decimalExponent);
}
else
{
DiyFp w = new DiyFp(v).Normalize();
result = TryRunCounted(in w, requestedDigits, number.Digits, out length, out decimalExponent);
}
if (result)
{
Debug.Assert((requestedDigits == -1) || (length == requestedDigits));
number.Scale = length + decimalExponent;
number.Digits[length] = (byte)('\0');
number.DigitsCount = length;
}
return(result);
}
public static unsafe void Dragon4Half(Half value, int cutoffNumber, bool isSignificantDigits, ref NumberBuffer number)
{
Half v = Half.IsNegative(value) ? Half.Negate(value) : value;
Debug.Assert((double)v > 0.0);
Debug.Assert(Half.IsFinite(v));
ushort mantissa = ExtractFractionAndBiasedExponent(value, out int exponent);
uint mantissaHighBitIdx;
bool hasUnequalMargins = false;
if ((mantissa >> DiyFp.HalfImplicitBitIndex) != 0)
{
mantissaHighBitIdx = DiyFp.HalfImplicitBitIndex;
hasUnequalMargins = (mantissa == (1U << DiyFp.HalfImplicitBitIndex));
}
else
{
Debug.Assert(mantissa != 0);
mantissaHighBitIdx = (uint)BitOperations.Log2(mantissa);
}
int length = (int)(Dragon4(mantissa, exponent, mantissaHighBitIdx, hasUnequalMargins, cutoffNumber, isSignificantDigits, number.Digits, out int decimalExponent));
number.Scale = decimalExponent + 1;
number.Digits[length] = (byte)('\0');
number.DigitsCount = length;
}
public DiyFp(Half value)
{
Debug.Assert(Half.IsFinite(value));
Debug.Assert((float)value > 0.0f);
f = ExtractFractionAndBiasedExponent(value, out e);
}