libm/math/
sinhf.rs

1use super::{expm1f, k_expo2f};
2
3/// The hyperbolic sine of `x` (f32).
4#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
5pub fn sinhf(x: f32) -> f32 {
6    let mut h = 0.5f32;
7    let mut ix = x.to_bits();
8    if (ix >> 31) != 0 {
9        h = -h;
10    }
11    /* |x| */
12    ix &= 0x7fffffff;
13    let absx = f32::from_bits(ix);
14    let w = ix;
15
16    /* |x| < log(FLT_MAX) */
17    if w < 0x42b17217 {
18        let t = expm1f(absx);
19        if w < 0x3f800000 {
20            if w < (0x3f800000 - (12 << 23)) {
21                return x;
22            }
23            return h * (2. * t - t * t / (t + 1.));
24        }
25        return h * (t + t / (t + 1.));
26    }
27
28    /* |x| > logf(FLT_MAX) or nan */
29    2. * h * k_expo2f(absx)
30}