w_atanh.c 1.1 KB

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  1. /* @(#)w_atanh.c 5.1 93/09/24 */
  2. /*
  3. * ====================================================
  4. * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  5. *
  6. * Developed at SunPro, a Sun Microsystems, Inc. business.
  7. * Permission to use, copy, modify, and distribute this
  8. * software is freely granted, provided that this notice
  9. * is preserved.
  10. * ====================================================
  11. */
  12. #if defined(LIBM_SCCS) && !defined(lint)
  13. static char rcsid[] = "$NetBSD: w_atanh.c,v 1.6 1995/05/10 20:48:43 jtc Exp $";
  14. #endif
  15. /*
  16. * wrapper atanh(x)
  17. */
  18. #include "math.h"
  19. #include "math_private.h"
  20. #ifdef __STDC__
  21. double atanh(double x) /* wrapper atanh */
  22. #else
  23. double atanh(x) /* wrapper atanh */
  24. double x;
  25. #endif
  26. {
  27. #ifdef _IEEE_LIBM
  28. return __ieee754_atanh(x);
  29. #else
  30. double z,y;
  31. z = __ieee754_atanh(x);
  32. if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
  33. y = fabs(x);
  34. if(y>=1.0) {
  35. if(y>1.0)
  36. return __kernel_standard(x,x,30); /* atanh(|x|>1) */
  37. else
  38. return __kernel_standard(x,x,31); /* atanh(|x|==1) */
  39. } else
  40. return z;
  41. #endif
  42. }
  43. libm_hidden_def(atanh)