use super::{expm1f, k_expo2f};

/// The hyperbolic sine of `x` (f32).

#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]

pub fn sinhf(x: f32) -> f32 {

    let mut h = 0.5f32;

    let mut ix = x.to_bits();

    if (ix >> 31) != 0 {

        h = -h;

    }

    /* |x| */

    ix &= 0x7fffffff;

    let absx = f32::from_bits(ix);

    let w = ix;

    /* |x| < log(FLT_MAX) */

    if w < 0x42b17217 {

        let t = expm1f(absx);

        if w < 0x3f800000 {

            if w < (0x3f800000 - (12 << 23)) {

                return x;

            }

            return h * (2. * t - t * t / (t + 1.));

        }

        return h * (t + t / (t + 1.));

    }

    /* |x| > logf(FLT_MAX) or nan */

    2. * h * k_expo2f(absx)

}