1use core::f32;
2
3use super::sqrtf;
4
5#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
6pub fn hypotf(mut x: f32, mut y: f32) -> f32 {
7 let x1p90 = f32::from_bits(0x6c800000); // 0x1p90f === 2 ^ 90
8 let x1p_90 = f32::from_bits(0x12800000); // 0x1p-90f === 2 ^ -90
9
10 let mut uxi = x.to_bits();
11 let mut uyi = y.to_bits();
12 let uti;
13 let mut z: f32;
14
15 uxi &= -1i32 as u32 >> 1;
16 uyi &= -1i32 as u32 >> 1;
17 if uxi < uyi {
18 uti = uxi;
19 uxi = uyi;
20 uyi = uti;
21 }
22
23 x = f32::from_bits(uxi);
24 y = f32::from_bits(uyi);
25 if uyi == 0xff << 23 {
26 return y;
27 }
28 if uxi >= 0xff << 23 || uyi == 0 || uxi - uyi >= 25 << 23 {
29 return x + y;
30 }
31
32 z = 1.;
33 if uxi >= (0x7f + 60) << 23 {
34 z = x1p90;
35 x *= x1p_90;
36 y *= x1p_90;
37 } else if uyi < (0x7f - 60) << 23 {
38 z = x1p_90;
39 x *= x1p90;
40 y *= x1p90;
41 }
42 z * sqrtf((x as f64 * x as f64 + y as f64 * y as f64) as f32)
43}
44