text: #include <math.h>
  
  
  float coshf(float x)
  {
  	union {float f; uint32_t i;} u = {.f = x};
  	uint32_t w;
  	float t;
  
  	/* |x| */
  	u.i &= 0x7fffffff;
  	x = u.f;
  	w = u.i;
  
  	/* |x| < log(2) */
  	if (w < 0x3f317217) {
  		if (w < 0x3f800000 - (12<<23)) {
  			FORCE_EVAL(x + 0x1p120f);
  			return 1;
  		}
  		t = expm1f(x);
  		return 1 + t*t/(2*(1+t));
  	}
  
  	/* |x| < log(FLT_MAX) */
  	if (w < 0x42b17217) {
  		t = expf(x);
  		return 0.5f*(t + 1/t);
  	}
  
  	/* |x| > log(FLT_MAX) or nan */
  	t = __expo2f(x);
  	return t;
  }
  