1*1e651e1eSRoland Levillain 2*1e651e1eSRoland Levillain /* @(#)w_atanh.c 1.3 95/01/18 */ 3*1e651e1eSRoland Levillain /* 4*1e651e1eSRoland Levillain * ==================================================== 5*1e651e1eSRoland Levillain * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 6*1e651e1eSRoland Levillain * 7*1e651e1eSRoland Levillain * Developed at SunSoft, a Sun Microsystems, Inc. business. 8*1e651e1eSRoland Levillain * Permission to use, copy, modify, and distribute this 9*1e651e1eSRoland Levillain * software is freely granted, provided that this notice 10*1e651e1eSRoland Levillain * is preserved. 11*1e651e1eSRoland Levillain * ==================================================== 12*1e651e1eSRoland Levillain */ 13*1e651e1eSRoland Levillain /* 14*1e651e1eSRoland Levillain * wrapper atanh(x) 15*1e651e1eSRoland Levillain */ 16*1e651e1eSRoland Levillain 17*1e651e1eSRoland Levillain #include "fdlibm.h" 18*1e651e1eSRoland Levillain 19*1e651e1eSRoland Levillain 20*1e651e1eSRoland Levillain #ifdef __STDC__ atanh(double x)21*1e651e1eSRoland Levillain double atanh(double x) /* wrapper atanh */ 22*1e651e1eSRoland Levillain #else 23*1e651e1eSRoland Levillain double atanh(x) /* wrapper atanh */ 24*1e651e1eSRoland Levillain double x; 25*1e651e1eSRoland Levillain #endif 26*1e651e1eSRoland Levillain { 27*1e651e1eSRoland Levillain #ifdef _IEEE_LIBM 28*1e651e1eSRoland Levillain return __ieee754_atanh(x); 29*1e651e1eSRoland Levillain #else 30*1e651e1eSRoland Levillain double z,y; 31*1e651e1eSRoland Levillain z = __ieee754_atanh(x); 32*1e651e1eSRoland Levillain if(_LIB_VERSION == _IEEE_ || ieee_isnan(x)) return z; 33*1e651e1eSRoland Levillain y = ieee_fabs(x); 34*1e651e1eSRoland Levillain if(y>=1.0) { 35*1e651e1eSRoland Levillain if(y>1.0) 36*1e651e1eSRoland Levillain return __kernel_standard(x,x,30); /* atanh(|x|>1) */ 37*1e651e1eSRoland Levillain else 38*1e651e1eSRoland Levillain return __kernel_standard(x,x,31); /* atanh(|x|==1) */ 39*1e651e1eSRoland Levillain } else 40*1e651e1eSRoland Levillain return z; 41*1e651e1eSRoland Levillain #endif 42*1e651e1eSRoland Levillain } 43