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      1 /* @(#)w_acosh.c 5.1 93/09/24 */
      2 /*
      3  * ====================================================
      4  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
      5  *
      6  * Developed at SunPro, a Sun Microsystems, Inc. business.
      7  * Permission to use, copy, modify, and distribute this
      8  * software is freely granted, provided that this notice
      9  * is preserved.
     10  * ====================================================
     11  */
     12 
     13 #include <sys/cdefs.h>
     14 #if defined(LIBM_SCCS) && !defined(lint)
     15 __RCSID("$NetBSD: w_acosh.c,v 1.9 2002/05/26 22:01:59 wiz Exp $");
     16 #endif
     17 
     18 /*
     19  * wrapper acosh(x)
     20  */
     21 
     22 #include "math.h"
     23 #include "math_private.h"
     24 
     25 double
     26 acosh(double x)		/* wrapper acosh */
     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 }
     40