w_acosh.c 987 B

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  1. /* @(#)w_acosh.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_acosh.c,v 1.6 1995/05/10 20:48:31 jtc Exp $";
  14. #endif
  15. /*
  16. * wrapper acosh(x)
  17. */
  18. #include "math.h"
  19. #include "math_private.h"
  20. #ifdef __STDC__
  21. double acosh(double x) /* wrapper acosh */
  22. #else
  23. double acosh(x) /* wrapper acosh */
  24. double x;
  25. #endif
  26. {
  27. #ifdef _IEEE_LIBM
  28. return __ieee754_acosh(x);
  29. #else
  30. double z;
  31. z = __ieee754_acosh(x);
  32. if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
  33. if(x<1.0) {
  34. return __kernel_standard(x,x,29); /* acosh(x<1) */
  35. } else
  36. return z;
  37. #endif
  38. }