w_atanhf.c (1186B)
1 /* w_atanhf.c -- float version of w_atanh.c. 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 3 */ 4 5 /* 6 * ==================================================== 7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 8 * 9 * Developed at SunPro, a Sun Microsystems, Inc. business. 10 * Permission to use, copy, modify, and distribute this 11 * software is freely granted, provided that this notice 12 * is preserved. 13 * ==================================================== 14 */ 15 16 #ifndef lint 17 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_atanhf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $"; 18 #endif 19 20 /* 21 * wrapper atanhf(x) 22 */ 23 24 #include "math.h" 25 #include "math_private.h" 26 27 28 float 29 atanhf(float x) /* wrapper atanhf */ 30 { 31 #ifdef _IEEE_LIBM 32 return __ieee754_atanhf(x); 33 #else 34 float z,y; 35 z = __ieee754_atanhf(x); 36 if(_LIB_VERSION == _IEEE_ || isnanf(x)) return z; 37 y = fabsf(x); 38 if(y>=(float)1.0) { 39 if(y>(float)1.0) 40 /* atanhf(|x|>1) */ 41 return (float)__kernel_standard((double)x,(double)x,130); 42 else 43 /* atanhf(|x|==1) */ 44 return (float)__kernel_standard((double)x,(double)x,131); 45 } else 46 return z; 47 #endif 48 }