source: azure_iot_hub/trunk/musl-1.1.18/src/math/sinhf.c@ 389

#include "libm.h"

float sinhf(float x)
{
        union {float f; uint32_t i;} u = {.f = x};
        uint32_t w;
        float t, h, absx;

        h = 0.5;
        if (u.i >> 31)
                h = -h;
        /* |x| */
        u.i &= 0x7fffffff;
        absx = u.f;
        w = u.i;

        /* |x| < log(FLT_MAX) */
        if (w < 0x42b17217) {
                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 */
        t = 2*h*__expo2f(absx);
        return t;
}