fenv.h 2.7 KB

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  1. /* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Library General Public License as
  5. published by the Free Software Foundation; either version 2 of the
  6. License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Library General Public License for more details.
  11. You should have received a copy of the GNU Library General Public
  12. License along with the GNU C Library; see the file COPYING.LIB. If not,
  13. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  14. Boston, MA 02111-1307, USA. */
  15. #ifndef _FENV_H
  16. # error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
  17. #endif
  18. #include <bits/wordsize.h>
  19. /* Define bits representing the exception. We use the bit positions
  20. of the appropriate accrued exception bits from the FSR. */
  21. enum
  22. {
  23. FE_INVALID = (1 << 9),
  24. #define FE_INVALID FE_INVALID
  25. FE_OVERFLOW = (1 << 8),
  26. #define FE_OVERFLOW FE_OVERFLOW
  27. FE_UNDERFLOW = (1 << 7),
  28. #define FE_UNDERFLOW FE_UNDERFLOW
  29. FE_DIVBYZERO = (1 << 6),
  30. #define FE_DIVBYZERO FE_DIVBYZERO
  31. FE_INEXACT = (1 << 5)
  32. #define FE_INEXACT FE_INEXACT
  33. };
  34. #define FE_ALL_EXCEPT \
  35. (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
  36. /* The Sparc FPU supports all of the four defined rounding modes. We
  37. use again the bit positions in the FPU control word as the values
  38. for the appropriate macros. */
  39. enum
  40. {
  41. FE_TONEAREST = (0U << 30),
  42. #define FE_TONEAREST FE_TONEAREST
  43. FE_TOWARDZERO = (1U << 30),
  44. #define FE_TOWARDZERO FE_TOWARDZERO
  45. FE_UPWARD = (2U << 30),
  46. #define FE_UPWARD FE_UPWARD
  47. FE_DOWNWARD = (3U << 30)
  48. #define FE_DOWNWARD FE_DOWNWARD
  49. };
  50. #define __FE_ROUND_MASK (3U << 30)
  51. /* Type representing exception flags. */
  52. typedef unsigned long int fexcept_t;
  53. /* Type representing floating-point environment. */
  54. typedef unsigned long int fenv_t;
  55. /* If the default argument is used we use this value. */
  56. #define FE_DFL_ENV ((fenv_t *) -1)
  57. #ifdef __USE_GNU
  58. /* Floating-point environment where none of the exception is masked. */
  59. # define FE_NOMASK_ENV ((fenv_t *) -2)
  60. #endif
  61. /* For internal use only: access the fp state register. */
  62. #if __WORDSIZE == 64
  63. # define __fenv_stfsr(X) __asm__ ("stx %%fsr,%0" : "=m" (X))
  64. # define __fenv_ldfsr(X) __asm__ __volatile__ ("ldx %0,%%fsr" : : "m" (X))
  65. #else
  66. # define __fenv_stfsr(X) __asm__ ("st %%fsr,%0" : "=m" (X))
  67. # define __fenv_ldfsr(X) __asm__ __volatile__ ("ld %0,%%fsr" : : "m" (X))
  68. #endif