w_j0.c 1.8 KB

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  1. /* Copyright (C) 2011-2016 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, see
  14. <http://www.gnu.org/licenses/>. */
  15. #include <math.h>
  16. #include "math_private.h"
  17. #if defined(__UCLIBC_HAS_FENV__)
  18. #include <fenv.h>
  19. #endif
  20. /* wrapper j0 */
  21. double
  22. j0 (double x)
  23. {
  24. #if defined(__UCLIBC_HAS_FENV__)
  25. if (__builtin_expect (isgreater (fabs (x), X_TLOSS), 0)
  26. && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
  27. /* j0(|x|>X_TLOSS) */
  28. return __kernel_standard (x, x, 34);
  29. #endif /* __UCLIBC_HAS_FENV__ */
  30. return __ieee754_j0 (x);
  31. }
  32. /* wrapper y0 */
  33. double
  34. y0 (double x)
  35. {
  36. #if defined(__UCLIBC_HAS_FENV__)
  37. if (__builtin_expect (islessequal (x, 0.0) || isgreater (x, X_TLOSS), 0)
  38. && _LIB_VERSION != _IEEE_)
  39. {
  40. if (x < 0.0)
  41. {
  42. /* d = zero/(x-x) */
  43. feraiseexcept (FE_INVALID);
  44. return __kernel_standard (x, x, 9);
  45. }
  46. else if (x == 0.0)
  47. {
  48. /* d = -one/(x-x) */
  49. feraiseexcept (FE_DIVBYZERO);
  50. return __kernel_standard (x, x, 8);
  51. }
  52. else if (_LIB_VERSION != _POSIX_)
  53. /* y0(x>X_TLOSS) */
  54. return __kernel_standard (x, x, 35);
  55. }
  56. #endif /* __UCLIBC_HAS_FENV__ */
  57. return __ieee754_y0 (x);
  58. }