static unsafe float CalcHalfToSingle(FP16 floatHalfPrecision)
{
uint result = mantissaTable[offsetTable[floatHalfPrecision.Value >> 10] + (floatHalfPrecision.Value & 0x3ff)] + exponentTable[floatHalfPrecision.Value >> 10];
float v1 = *((float *)&result);
return(v1);
}
internal static unsafe FP16 SingleToHalf(float single)
{
uint value = *((uint *)&single);
ushort result = (ushort)(baseTable[(value >> 23) & 0x1ff] + ((value & 0x007fffff) >> shiftTable[value >> 23]));
return(FP16.ToHalf(result));
}
static void InitializeLookup()
{
LOOKUP = new float[ushort.MaxValue + 1];
for (int i = 0; i <= ushort.MaxValue; i++)
{
FP16 fp16 = new FP16((ushort)i, true);
LOOKUP[i] = CalcHalfToSingle(fp16);
}
}
internal static unsafe float HalfToSingle(FP16 floatHalfPrecision)
{
#if NOT
// slower
CheckLOOKUPInitialized();
return(LOOKUP[floatHalfPrecision.Value]);
#endif
uint result = mantissaTable[offsetTable[floatHalfPrecision.Value >> 10] + (floatHalfPrecision.Value & 0x3ff)] + exponentTable[floatHalfPrecision.Value >> 10];
return(*((float *)&result));
}
internal static bool IsNegativeInfinity(FP16 floatHalfPrecision) => floatHalfPrecision.Value == 0xfc00;
internal static bool IsInfinity(FP16 floatHalfPrecision) => (floatHalfPrecision.Value & 0x7fff) == 0x7c00;
internal static bool IsNaN(FP16 floatHalfPrecision) => (floatHalfPrecision.Value & 0x7fff) > 0x7c00;
internal static FP16 Abs(FP16 floatHalfPrecision) => FP16.ToHalf((ushort)(floatHalfPrecision.Value & 0x7fff));
internal static FP16 Negate(FP16 floatHalfPrecision) => FP16.ToHalf((ushort)(floatHalfPrecision.Value ^ 0x8000));
internal static unsafe float HalfToSingleLookup(FP16 floatHalfPrecision)
{
return(LOOKUP[floatHalfPrecision.Value]);
}
