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_ || 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
