w_atan2f.c 1.4 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. /*
  16. * wrapper atan2f(y,x)
  17. */
  18. #include <math.h>
  19. #include "math_private.h"
  20. #if defined(__UCLIBC_HAS_FENV__)
  21. #include <errno.h>
  22. #endif
  23. float
  24. atan2f (float y, float x)
  25. {
  26. #if defined(__UCLIBC_HAS_FENV__)
  27. float z;
  28. if (__builtin_expect (x == 0.0f && y == 0.0f, 0) && _LIB_VERSION == _SVID_)
  29. return __kernel_standard_f (y, x, 103); /* atan2(+-0,+-0) */
  30. z = (float) __ieee754_atan2 ((double) y, (double) x);
  31. if (__builtin_expect (z == 0.0f && y != 0.0f && isfinite (x), 0))
  32. __set_errno (ERANGE);
  33. return z;
  34. #else
  35. return (float) __ieee754_atan2 ((double) y, (double) x);
  36. #endif
  37. }