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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);
}