POK
acosh.c
1 /*
2  * POK header
3  *
4  * The following file is a part of the POK project. Any modification should
5  * made according to the POK licence. You CANNOT use this file or a part of
6  * this file is this part of a file for your own project
7  *
8  * For more information on the POK licence, please see our LICENCE FILE
9  *
10  * Please follow the coding guidelines described in doc/CODING_GUIDELINES
11  *
12  * Copyright (c) 2007-2009 POK team
13  *
14  * Created by julien on Fri Jan 30 14:41:34 2009
15  */
16 
17 /* @(#)w_acosh.c 5.1 93/09/24 */
18 /*
19  * ====================================================
20  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
21  *
22  * Developed at SunPro, a Sun Microsystems, Inc. business.
23  * Permission to use, copy, modify, and distribute this
24  * software is freely granted, provided that this notice
25  * is preserved.
26  * ====================================================
27  */
28 
29 #ifdef POK_NEEDS_LIBMATH
30 /*
31  * wrapper acosh(x)
32  */
33 
34 #include <libm.h>
35 #include "math_private.h"
36 
37 double
38 acosh(double x) /* wrapper acosh */
39 {
40 #ifdef _IEEE_LIBM
41  return __ieee754_acosh(x);
42 #else
43  double z;
44  z = __ieee754_acosh(x);
45  if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
46  if(x<1.0) {
47  return __kernel_standard(x,x,29); /* acosh(x<1) */
48  } else
49  return z;
50 #endif
51 }
52 
53 #endif