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w_acosh.c
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1 
2 /* @(#)w_acosh.c 1.3 95/01/18 */
3 /*
4  * ====================================================
5  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6  *
7  * Developed at SunSoft, a Sun Microsystems, Inc. business.
8  * Permission to use, copy, modify, and distribute this
9  * software is freely granted, provided that this notice
10  * is preserved.
11  * ====================================================
12  *
13  */
14 
15 /*
16  * wrapper acosh(x)
17  */
18 
19 #include "fdlibm.h"
20 
21 #ifdef __STDC__
22  double acosh(double x) /* wrapper acosh */
23 #else
24  double acosh(x) /* wrapper acosh */
25  double x;
26 #endif
27 {
28 #ifdef _IEEE_LIBM
29  return __ieee754_acosh(x);
30 #else
31  double z;
32  z = __ieee754_acosh(x);
33  if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
34  if(x<1.0) {
35  return __kernel_standard(x,x,29); /* acosh(x<1) */
36  } else
37  return z;
38 #endif
39 }