static float FloatSwap(float f)
{
var dat = new reinterpret.F2ui {
f = f
};
dat.u = BinaryPrimitives.ReverseEndianness(dat.u);
return(dat.f);
}
public static float InvSqrt16(float x) // inverse square root with 16 bits precision, returns huge number when x == 0.0
{
Debug.Assert(initialized);
uint a = new reinterpret.F2ui {
f = x
}.u;
reinterpret.F2ui seed = new();
double y = x * 0.5f;
seed.u = (((3 * EXP_BIAS - 1 - ((a >> EXP_POS) & 0xFF)) >> 1) << EXP_POS) | iSqrt[(a >> (EXP_POS - LOOKUP_BITS)) & LOOKUP_MASK];
double r = seed.f;
r *= 1.5f - r * r * y;
return((float)r);
}