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 #if defined(LIBM_SCCS) && !defined(lint) 14 static char rcsid[] = "$NetBSD: w_acosh.c,v 1.6 1995/05/10 20:48:31 jtc Exp $"; 15 #endif 16 17 /* 18 * wrapper acosh(x) 19 */ 20 21 #include "math.h" 22 #include "math_private.h" 23 24 #ifdef __STDC__ 25 double acosh(double x) /* wrapper acosh */ 26 #else 27 double acosh(x) /* wrapper acosh */ 28 double x; 29 #endif 30 { 31 #ifdef _IEEE_LIBM 32 return __ieee754_acosh(x); 33 #else 34 double z; 35 z = __ieee754_acosh(x); 36 if(_LIB_VERSION == _IEEE_ || isnan(x)) return z; 37 if(x<1.0) { 38 return __kernel_standard(x,x,29); /* acosh(x<1) */ 39 } else 40 return z; 41 #endif 42 } 43