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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__
acosh(double x)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_ || 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 }
40