NAME
    IEEESPLog -- compute the natural logarithm of a floating point number
SYNOPSIS
      x   = IEEESPLog(  y  );
    d0                d0
    float   x,y;
FUNCTION
    Compute ln(y) in IEEE single precision
INPUTS
    y - IEEE single precision floating point value
RESULT
    x - IEEE single precision floating point value
BUGS
SEE ALSO
    ieeespexp()