libm/math/
frexpf.rs

1#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
2pub fn frexpf(x: f32) -> (f32, i32) {
3    let mut y = x.to_bits();
4    let ee: i32 = ((y >> 23) & 0xff) as i32;
5
6    if ee == 0 {
7        if x != 0.0 {
8            let x1p64 = f32::from_bits(0x5f800000);
9            let (x, e) = frexpf(x * x1p64);
10            return (x, e - 64);
11        } else {
12            return (x, 0);
13        }
14    } else if ee == 0xff {
15        return (x, 0);
16    }
17
18    let e = ee - 0x7e;
19    y &= 0x807fffff;
20    y |= 0x3f000000;
21    (f32::from_bits(y), e)
22}