math/w_atanhf.c

   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 #if defined(LIBM_SCCS) && !defined(lint)
  17 static char rcsid[] = "$NetBSD: w_atanhf.c,v 1.3 1995/05/10 20:48:45 jtc Exp $";
  18 #endif
  19
  20 /*
  21  * wrapper atanhf(x)
  22  */
  23
  24 #include "math.h"
  25 #include "math_private.h"
  26
  27
  28 #ifdef __STDC__
  29         float __atanhf(float x)         /* wrapper atanhf */
  30 #else
  31         float __atanhf(x)                       /* wrapper atanhf */
  32         float x;
  33 #endif
  34 {
  35 #ifdef _IEEE_LIBM
  36         return __ieee754_atanhf(x);
  37 #else
  38         float z,y;
  39         z = __ieee754_atanhf(x);
  40         if(_LIB_VERSION == _IEEE_ || __isnanf(x)) return z;
  41         y = fabsf(x);
  42         if(y>=(float)1.0) {
  43             if(y>(float)1.0)
  44                 /* atanhf(|x|>1) */
  45                 return (float)__kernel_standard((double)x,(double)x,130);
  46             else
  47                 /* atanhf(|x|==1) */
  48                 return (float)__kernel_standard((double)x,(double)x,131);
  49         } else
  50             return z;
  51 #endif
  52 }
  53 weak_alias (__atanhf, atanhf)