NAME
    IEEESPFloor -- compute Floor function of IEEE single precision number
SYNOPSIS
      x   = IEEESPFloor(  y  );
      d0                  d0
    float   x,y;
FUNCTION
    Calculate the largest integer less than or equal to x and return it.
INPUTS
    y -- IEEE single precision floating point value
RESULT
    x -- IEEE single precision floating point value
BUGS
SEE ALSO
    ieeespceil