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  1. /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
  2. /* w_atanhf.c -- float version of w_atanh.c.
  3.  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
  4.  */
  5.  
  6. /*
  7.  * ====================================================
  8.  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  9.  *
  10.  * Developed at SunPro, a Sun Microsystems, Inc. business.
  11.  * Permission to use, copy, modify, and distribute this
  12.  * software is freely granted, provided that this notice
  13.  * is preserved.
  14.  * ====================================================
  15.  */
  16.  
  17. #if defined(LIBM_SCCS) && !defined(lint)
  18. static char rcsid[] = "$Id: w_atanhf.c,v 1.1 1994/08/10 20:33:48 jtc Exp $";
  19. #endif
  20.  
  21. /*
  22.  * wrapper atanhf(x)
  23.  */
  24.  
  25. #include "math.h"
  26. #include "math_private.h"
  27.  
  28.  
  29. #ifdef __STDC__
  30.         float atanhf(float x)           /* wrapper atanhf */
  31. #else
  32.         float atanhf(x)                 /* wrapper atanhf */
  33.         float x;
  34. #endif
  35. {
  36. #ifdef _IEEE_LIBM
  37.         return __ieee754_atanhf(x);
  38. #else
  39.         float z,y;
  40.         z = __ieee754_atanhf(x);
  41.         if(_LIB_VERSION == _IEEE_ || isnanf(x)) return z;
  42.         y = fabsf(x);
  43.         if(y>=(float)1.0) {
  44.             if(y>(float)1.0)
  45.                 /* atanhf(|x|>1) */
  46.                 return (float)__kernel_standard((double)x,(double)x,130);
  47.             else
  48.                 /* atanhf(|x|==1) */
  49.                 return (float)__kernel_standard((double)x,(double)x,131);
  50.         } else
  51.             return z;
  52. #endif
  53. }
  54.