/// <summary>
/// Constructs a BigFloat from a 64-bit integer
/// </summary>
/// <param name="value"></param>
/// <param name="mantissaPrec"></param>
public BigFloat(Int64 value, PrecisionSpec mantissaPrec)
{
int mbWords = ((mantissaPrec.NumBits) >> 5);
if ((mantissaPrec.NumBits & 31) != 0) mbWords++;
int newManBits = mbWords << 5;
//For efficiency, we just use a 32-bit exponent
exponent = 0;
UInt64 uValue;
if (value < 0)
{
if (value == Int64.MinValue)
{
uValue = 0x80000000;
}
else
{
uValue = (UInt64)(-value);
}
}
else
{
uValue = (UInt64)value;
}
mantissa = new BigInt(value, new PrecisionSpec(newManBits, PrecisionSpec.BaseType.BIN));
//scratch = new BigInt(new PrecisionSpec(newManBits, PrecisionSpec.BaseType.BIN));
int bit = BigInt.GetMSB(uValue);
if (bit == -1) return;
int shift = mantissa.Precision.NumBits - (bit + 1);
if (shift > 0)
{
mantissa.LSH(shift);
}
else
{
mantissa.SetHighDigit((uint)(uValue >> (-shift)));
}
exponent = bit;
}
/// <summary>
/// Constructs a BigFloat from a 64-bit unsigned integer
/// </summary>
/// <param name="value"></param>
/// <param name="mantissaPrec"></param>
public BigFloat(UInt64 value, PrecisionSpec mantissaPrec)
{
int mbWords = ((mantissaPrec.NumBits) >> 5);
if ((mantissaPrec.NumBits & 31) != 0) mbWords++;
int newManBits = mbWords << 5;
//For efficiency, we just use a 32-bit exponent
exponent = 0;
int bit = BigInt.GetMSB(value);
mantissa = new BigInt(value, new PrecisionSpec(newManBits, PrecisionSpec.BaseType.BIN));
//scratch = new BigInt(mantissa.Precision);
int shift = mantissa.Precision.NumBits - (bit + 1);
if (shift > 0)
{
mantissa.LSH(shift);
}
else
{
mantissa.SetHighDigit((uint)(value >> (-shift)));
}
exponent = bit;
}
/// <summary>
/// Constructs a big float from a UInt32 to the required precision
/// </summary>
/// <param name="value"></param>
/// <param name="mantissaPrec"></param>
public BigFloat(UInt32 value, PrecisionSpec mantissaPrec)
{
int mbWords = ((mantissaPrec.NumBits) >> 5);
if ((mantissaPrec.NumBits & 31) != 0) mbWords++;
int newManBits = mbWords << 5;
//For efficiency, we just use a 32-bit exponent
exponent = 0;
mantissa = new BigInt(value, new PrecisionSpec(newManBits, PrecisionSpec.BaseType.BIN));
//scratch = new BigInt(mantissa.Precision);
int bit = BigInt.GetMSB(value);
if (bit == -1) return;
int shift = mantissa.Precision.NumBits - (bit + 1);
mantissa.LSH(shift);
exponent = bit;
}