mathinline.h 1.7 KB

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  1. /* Inline math functions for ia64.
  2. Copyright (C) 2004 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  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. #ifndef _MATH_H
  16. # error "Never use <bits/mathinline.h> directly; include <math.h> instead."
  17. #endif
  18. #ifdef __cplusplus
  19. # define __MATH_INLINE __inline
  20. #else
  21. # define __MATH_INLINE extern __inline
  22. #endif
  23. #if defined __USE_ISOC99 && defined __GNUC__ && __GNUC__ >= 2
  24. /* The gcc, version 2.7 or below, has problems with all this inlining
  25. code. So disable it for this version of the compiler. */
  26. # if __GNUC_PREREQ (2, 8)
  27. /* Test for negative number. Used in the signbit() macro. */
  28. __MATH_INLINE int
  29. __NTH (__signbitf (float __x))
  30. {
  31. __extension__ union { float __f; int __i; } __u = { __f: __x };
  32. return __u.__i < 0;
  33. }
  34. __MATH_INLINE int
  35. __NTH (__signbit (double __x))
  36. {
  37. __extension__ union { double __d; int __i[2]; } __u = { __d: __x };
  38. return __u.__i[1] < 0;
  39. }
  40. __MATH_INLINE int
  41. __NTH (__signbitl (long double __x))
  42. {
  43. __extension__ union { long double __l; int __i[3]; } __u = { __l: __x };
  44. return (__u.__i[2] & 0x8000) != 0;
  45. }
  46. # endif
  47. #endif