public static void GetDoubleParts(double dbl, out int sign, out int exp, out ulong man, out bool fFinite)
{
ulong bits = BitConverter.DoubleToUInt64Bits(dbl);
sign = 1 - ((int)(bits >> 62) & 2);
man = bits & 0x000FFFFFFFFFFFFF;
exp = (int)(bits >> 52) & 0x7FF;
if (exp == 0)
{
// Denormalized number.
fFinite = true;
if (man != 0)
{
exp = -1074;
}
}
else if (exp == 0x7FF)
{
// NaN or Infinite.
fFinite = false;
exp = int.MaxValue;
}
else
{
fFinite = true;
man |= 0x0010000000000000;
exp -= 1075;
}
}
public static void DoubleToUInt64Bits()
{
double input = 123456.3234;
ulong result = BitConverter.DoubleToUInt64Bits(input);
Assert.Equal(4683220267154373240UL, result);
double roundtripped = BitConverter.UInt64BitsToDouble(result);
Assert.Equal(input, roundtripped);
}
public static UInt64 ToBits(this Double num)
{
#if BITWISE_FLOAT_CONVERSION
return(BitConverter.DoubleToUInt64Bits(num));
#else
unsafe
{
return(*(UInt64 *)&num);
}
#endif
}
public void TestParserDouble_SpecificPowers(int b, int start, int end)
{
for (int i = start; i != end; i++)
{
double d = Math.Pow(b, i);
ulong bits = BitConverter.DoubleToUInt64Bits(d);
TestRoundTripDouble(bits - 1);
TestRoundTripDouble(bits);
TestRoundTripDouble(bits + 1);
}
}
private static void AssertBitwiseEqual(double expected, double actual)
{
ulong expectedBits = BitConverter.DoubleToUInt64Bits(expected);
ulong actualBits = BitConverter.DoubleToUInt64Bits(actual);
if (expectedBits == actualBits)
{
return;
}
if (Complex.IsNaN(expected) && Complex.IsNaN(actual))
{
return;
}
throw new Xunit.Sdk.EqualException(expected, actual);
}
public static void PositiveInfinity()
{
Assert.Equal(1.0 / 0.0, double.PositiveInfinity);
Assert.Equal(0x7FF00000_00000000u, BitConverter.DoubleToUInt64Bits(double.PositiveInfinity));
}
public static void NegativeInfinity()
{
Assert.Equal(-1.0 / 0.0, double.NegativeInfinity);
Assert.Equal(0xFFF00000_00000000u, BitConverter.DoubleToUInt64Bits(double.NegativeInfinity));
}
public static void NaN()
{
Assert.Equal(0.0 / 0.0, double.NaN);
Assert.Equal(0xFFF80000_00000000u, BitConverter.DoubleToUInt64Bits(double.NaN));
}
public static void MinValue()
{
Assert.Equal(-1.7976931348623157E+308, double.MinValue);
Assert.Equal(0xFFEFFFFF_FFFFFFFFu, BitConverter.DoubleToUInt64Bits(double.MinValue));
}
public static void Epsilon()
{
Assert.Equal(4.9406564584124654E-324, double.Epsilon);
Assert.Equal(0x00000000_00000001u, BitConverter.DoubleToUInt64Bits(double.Epsilon));
}
// Writes a double to this stream. The current position of the stream is
// advanced by eight.
//
//| <include file='doc\BinaryWriter.uex' path='docs/doc[@for="BinaryWriter.Write8"]/*' />
public virtual void Write(double value)
{
Write(BitConverter.DoubleToUInt64Bits(value));
}
public static void MinTest(double left, double right, double expected)
{
Assert.That(() => BitConverter.DoubleToUInt64Bits(MathUtilities.Min(left, right)),
Is.EqualTo(BitConverter.DoubleToUInt64Bits(expected))
);
}
public static uint ExtractMostSignificantBit(T value)
{
if (typeof(T) == typeof(byte))
{
uint bits = (byte)(object)value;
return(bits >> 7);
}
else if (typeof(T) == typeof(double))
{
ulong bits = BitConverter.DoubleToUInt64Bits((double)(object)value);
return((uint)(bits >> 63));
}
else if (typeof(T) == typeof(short))
{
uint bits = (ushort)(short)(object)value;
return(bits >> 15);
}
else if (typeof(T) == typeof(int))
{
uint bits = (uint)(int)(object)value;
return(bits >> 31);
}
else if (typeof(T) == typeof(long))
{
ulong bits = (ulong)(long)(object)value;
return((uint)(bits >> 63));
}
else if (typeof(T) == typeof(nint))
{
#if TARGET_64BIT
ulong bits = (ulong)(nint)(object)value;
return((uint)(bits >> 63));
#else
uint bits = (uint)(nint)(object)value;
return(bits >> 31);
#endif
}
else if (typeof(T) == typeof(nuint))
{
#if TARGET_64BIT
ulong bits = (ulong)(nuint)(object)value;
return((uint)(bits >> 63));
#else
uint bits = (uint)(nuint)(object)value;
return(bits >> 31);
#endif
}
else if (typeof(T) == typeof(sbyte))
{
uint bits = (byte)(sbyte)(object)value;
return(bits >> 7);
}
else if (typeof(T) == typeof(float))
{
uint bits = BitConverter.SingleToUInt32Bits((float)(object)value);
return(bits >> 31);
}
else if (typeof(T) == typeof(ushort))
{
uint bits = (ushort)(object)value;
return(bits >> 15);
}
else if (typeof(T) == typeof(uint))
{
uint bits = (uint)(object)value;
return(bits >> 31);
}
else if (typeof(T) == typeof(ulong))
{
ulong bits = (ulong)(object)value;
return((uint)(bits >> 63));
}
else
{
throw new NotSupportedException(SR.Arg_TypeNotSupported);
}
}
