public static UInt64 FromFixedPoint32(UInt32 mantissa, int numDigits)
{
// TODO: Unsigned comparison could be slightly faster, maybe
return(numDigits + (Int32.MinValue + BiasedExponentMaxValue - BaseExponent) > (Int32.MinValue + BiasedExponentMaxValue)
? NativeImpl.fromFixedPointU32(mantissa, numDigits)
: FromFixedPointFastUnsignedUnchecked(mantissa, numDigits));
}
public static UInt64 FromFixedPointLimitedU64(UInt64 mantissa, int numDigits)
{
Debug.Assert(mantissa < (1UL << 53));
return(numDigits + (Int32.MinValue + BiasedExponentMaxValue - BaseExponent) > (Int32.MinValue + BiasedExponentMaxValue)
? NativeImpl.fromFixedPoint64((Int64)mantissa, numDigits)
: FromFixedPointFastUnsignedUnchecked(mantissa, numDigits));
}
public static Decimal64 FromFixedPoint(long mantissa, int numberOfDigits)
{
// TODO: More optimizations
return(new Decimal64(
0 == (mantissa & (-1L << 53))
? DotNetImpl.FromFixedPointLimitedU64((UInt64)mantissa, numberOfDigits)
: NativeImpl.fromFixedPoint64(mantissa, numberOfDigits)));
}
public Decimal64 RoundToNearestTiesAwayFromZero(Decimal64 multiple)
{
if (!multiple.IsFinite() || multiple.IsNonPositive())
{
throw new ArgumentException("Multiple must be a positive finite number.");
}
if (IsNaN())
{
return(this);
}
UInt64 ratio = NativeImpl.roundToNearestTiesAwayFromZero(NativeImpl.divide(Bits, multiple.Bits));
return(new Decimal64(NativeImpl.multiply2(ratio, multiple.Bits)));
}
public Decimal64 Multiply(Decimal64 b)
{
return(new Decimal64(NativeImpl.multiply2(Bits, b.Bits)));
}
public static Decimal ToDecimalFallback(UInt64 value)
{
return(new Decimal(NativeImpl.toFloat64(value)));
}
public long ToLong()
{
return(NativeImpl.toInt64(Bits));
}
public Int64 ToFixedPoint(int numberOfDigits)
{
return(NativeImpl.toFixedPoint(Bits, numberOfDigits));
}
public static Decimal64 operator /(Decimal64 a, Decimal64 b)
{
return(new Decimal64(NativeImpl.divide(a.Bits, b.Bits)));
}
public Decimal64 Divide(Decimal64 b)
{
return(new Decimal64(NativeImpl.divide(Bits, b.Bits)));
}
public static Decimal64 operator *(Int64 a, Decimal64 b)
{
return(new Decimal64(NativeImpl.multiplyByInt64(b.Bits, a)));
}
public static Decimal64 operator *(Decimal64 a, Int64 b)
{
return(new Decimal64(NativeImpl.multiplyByInt64(a.Bits, b)));
}
public Decimal64 MultiplyByInteger(Int64 b)
{
return(new Decimal64(NativeImpl.multiplyByInt64(Bits, b)));
}
public static Decimal64 operator *(Decimal64 a, Decimal64 b)
{
return(new Decimal64(NativeImpl.multiply2(a.Bits, b.Bits)));
}
public Decimal64 Multiply(Decimal64 b, Decimal64 c, Decimal64 d)
{
return(new Decimal64(NativeImpl.multiply4(Bits, b.Bits, c.Bits, d.Bits)));
}
public Decimal64 RoundTowardsZero()
{
return(new Decimal64(NativeImpl.roundTowardsZero(Bits)));
}
public Decimal64 RoundToNearestTiesAwayFromZero()
{
return(new Decimal64(NativeImpl.roundToNearestTiesAwayFromZero(Bits)));
}
public Decimal64 DivideByInteger(Int64 b)
{
return(new Decimal64(NativeImpl.divideByInt64(Bits, b)));
}
public Decimal64 NextDown()
{
return(new Decimal64(NativeImpl.nextDown(Bits)));
}
public static Decimal64 operator /(Decimal64 a, Int64 b)
{
return(new Decimal64(NativeImpl.divideByInt64(a.Bits, b)));
}
public Int32 CompareTo(Decimal64 other)
{
return(NativeImpl.compare(Bits, other.Bits));
}
public Decimal64 MultiplyAndAdd(Decimal64 b, Decimal64 c)
{
return(new Decimal64(NativeImpl.multiplyAndAdd(Bits, b.Bits, c.Bits)));
}
public static Decimal64 FromLong(long value)
{
return(new Decimal64(NativeImpl.fromInt64(value)));
}
public Decimal64 ScaleByPowerOfTen(Int32 n)
{
return(new Decimal64(NativeImpl.scaleByPowerOfTen(Bits, n)));
}
public Decimal64 Mean(Decimal64 b)
{
return(new Decimal64(NativeImpl.mean2(Bits, b.Bits)));
}
public Decimal64 Ceiling()
{
return(new Decimal64(NativeImpl.roundTowardsPositiveInfinity(Bits)));
}
public static UInt64 FromDecimalFallback(Decimal dec)
{
return(NativeImpl.fromFloat64((double)dec));
}
public Decimal64 RoundTowardsNegativeInfinity()
{
return(new Decimal64(NativeImpl.roundTowardsNegativeInfinity(Bits)));
}
internal static UInt64 FromDecimalFloat64(Double x)
{
unchecked
{
UInt64 y = NativeImpl.fromFloat64(x);
// Using signed values because unsigned division optimizations are worse than signed
// in MS .NET, esp. Core2.0 while it should be opposite
Int64 m;
UInt64 signAndExp;
UInt64 notY = ~y;
if ((SpecialEncodingMask & notY) == 0)
{
// Special value or large coefficient
if ((InfinityMask & notY) == 0)
{
return(y); // Infinity etc.
}
m = (Int64)((y & LargeCoefficientMask) + LargeCoefficientHighBits);
//signAndExp = ((y << 2) & SmallCoefficientExponentMask) + (y & SignMask);
signAndExp = (y & LargeCoefficientExponentMask) * 4 + (y & SignMask);
if ((y & 1) != 0)
{
goto NeedAdjustment;
}
}
else
{
// "Normal" value
m = (Int64)(y & SmallCoefficientMask);
// 16 digits + odd
signAndExp = y & (UInt64.MaxValue << ExponentShiftSmall);
if ((y & 1) != 0 && (UInt64)m > MaxCoefficient / 10 + 1)
{
goto NeedAdjustment;
}
if (0 == m)
{
return(Zero);
}
}
NeedCanonize:
for (Int64 n = m; ;)
{
Int64 mNext = n / 10;
if (mNext * 10 != n)
{
return(signAndExp + (UInt64)n);
}
n = mNext;
signAndExp += 1L << ExponentShiftSmall;
}
NeedAdjustment:
// Check the last digit
Int64 m1 = m + 1;
m = m1 / 10;
if (m1 - m * 10 > 2)
{
return(y);
}
signAndExp += 1L << ExponentShiftSmall;
if (NativeImpl.toFloat64(signAndExp + (UInt64)m) != x)
{
return(y);
}
goto NeedCanonize;
}
}
public static Decimal64 operator -(Decimal64 a, Decimal64 b)
{
return(new Decimal64(NativeImpl.subtract(a.Bits, b.Bits)));
}
