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    pub fn modf(x: f64) -> (f64, f64) {
        let rv2: f64;
        let mut u = x.to_bits();
        let mask: u64;
        let e = ((u >> 52 & 0x7ff) as i32) - 0x3ff;

        /* no fractional part */
        if e >= 52 {
            rv2 = x;
            if e == 0x400 && (u << 12) != 0 {
                /* nan */
                return (x, rv2);
            }
            u &= 1 << 63;
            return (f64::from_bits(u), rv2);
        }

        /* no integral part*/
        if e < 0 {
            u &= 1 << 63;
            rv2 = f64::from_bits(u);
            return (x, rv2);
        }

        mask = ((!0) >> 12) >> e;
        if (u & mask) == 0 {
            rv2 = x;
            u &= 1 << 63;
            return (f64::from_bits(u), rv2);
        }
        u &= !mask;
        rv2 = f64::from_bits(u);
        return (x - rv2, rv2);
    }

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