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    pub fn frexp(x: f64) -> (f64, i32) {
        let mut y = x.to_bits();
        let ee = ((y >> 52) & 0x7ff) as i32;

        if ee == 0 {
            if x != 0.0 {
                let x1p64 = f64::from_bits(0x43f0000000000000);
                let (x, e) = frexp(x * x1p64);
                return (x, e - 64);
            }
            return (x, 0);
        } else if ee == 0x7ff {
            return (x, 0);
        }

        let e = ee - 0x3fe;
        y &= 0x800fffffffffffff;
        y |= 0x3fe0000000000000;
        return (f64::from_bits(y), e);
    }

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