NAME
    IEEESPFix -- convert IEEE single float to integer
SYNOPSIS
    x   = IEEESPFix(  y  );
    d0               d0
    long    x;
    float   y;
FUNCTION
    Convert IEEE single precision argument to a 32 bit signed integer
    and return result.
INPUTS
    y -- IEEE single precision floating point value
RESULT
    if no overflow occured then return
            x -- 32 bit signed integer
    if overflow return largest +- integer
            For round to zero
BUGS
SEE ALSO
    ieeespflt