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 1.8 1999/07/02 15:37:43 simonb Exp $"); 16#endif 17 18/* 19 * wrapper acosh(x) 20 */ 21 22#include "math.h" 23#include "math_private.h" 24 25double 26acosh(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