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fenv.h

fenv.h 2.0 KB
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  1. #ifndef _FENV_H
    2. 

  2. #define _FENV_H
    3. 

  3. 

  4. /*
    5. 

  5.   For now, support only for the basic abstraction of flags that are
    6. 

  6.   either set or clear. fexcept_t could be  structure that holds more info
    7. 

  7.   about the fp environment.
    8. 

  8. */
    9. 

  9. typedef unsigned short fexcept_t;
    10. 

  10. 

  11. /* This 28-byte struct represents the entire floating point
    12. 

  12.    environment as stored by fnstenv or fstenv */
    13. 

  13. typedef struct
    14. 

  14. {
    15. 

  15.   unsigned short __control_word;
    16. 

  16.   unsigned short __unused0;
    17. 

  17.   unsigned short __status_word;
    18. 

  18.   unsigned short __unused1;
    19. 

  19.   unsigned short __tag_word;
    20. 

  20.   unsigned short __unused2;  
    21. 

  21.   unsigned int	 __ip_offset;    /* instruction pointer offset */
    22. 

  22.   unsigned short __ip_selector;  
    23. 

  23.   unsigned short __opcode;
    24. 

  24.   unsigned int	 __data_offset;
    25. 

  25.   unsigned short __data_selector;  
    26. 

  26.   unsigned short __unused3;
    27. 

  27. } fenv_t;
    28. 

  28. 

  29. 

  30. /* FPU status word exception flags */
    31. 

  31. #define FE_INVALID	0x01
    32. 

  32. #define FE_DENORMAL	0x02
    33. 

  33. #define FE_DIVBYZERO	0x04
    34. 

  34. #define FE_OVERFLOW	0x08
    35. 

  35. #define FE_UNDERFLOW	0x10
    36. 

  36. #define FE_INEXACT	0x20
    37. 

  37. #define FE_ALL_EXCEPT (FE_INVALID | FE_DENORMAL | FE_DIVBYZERO \
    38. 

  38. 		       | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)
    39. 

  39. 

  40. /* FPU control word rounding flags */
    41. 

  41. #define FE_TONEAREST	0x0000
    42. 

  42. #define FE_DOWNWARD	0x0400
    43. 

  43. #define FE_UPWARD	0x0800
    44. 

  44. #define FE_TOWARDZERO	0x0c00
    45. 

  45. 

  46. 

  47. /* The default floating point environment */
    48. 

  48. #define FE_DFL_ENV ((const fenv_t *)-1)
    49. 

  49. 

  50. 

  51. #ifndef RC_INVOKED
    52. 

  52. #ifdef __cplusplus
    53. 

  53. extern "C" {
    54. 

  54. #endif
    55. 

  55. 

  56. 

  57. /*TODO: Some of these could be inlined */
    58. 

  58. /* 7.6.2 Exception */
    59. 

  59. 

  60. extern int feclearexcept (int);
    61. 

  61. extern int fegetexceptflag (fexcept_t * flagp, int excepts);
    62. 

  62. extern int feraiseexcept (int excepts );
    63. 

  63. extern int fesetexceptflag (const fexcept_t *, int);
    64. 

  64. extern int fetestexcept (int excepts);
    65. 

  65. 

  66. 

  67. /* 7.6.3 Rounding */
    68. 

  68. 

  69. extern int fegetround (void);
    70. 

  70. extern int fesetround (int mode);
    71. 

  71. 

  72. 

  73. /* 7.6.4 Environment */
    74. 

  74. 

  75. extern int fegetenv (fenv_t * envp);
    76. 

  76. extern int fesetenv (const fenv_t * );
    77. 

  77. extern int feupdateenv (const fenv_t *);
    78. 

  78. extern int feholdexcept (fenv_t *);
    79. 

  79. 

  80. #ifdef __cplusplus
    81. 

  81. }
    82. 

  82. #endif
    83. 

  83. #endif	/* Not RC_INVOKED */
    84. 

  84. 

  85. #endif /* ndef _FENV_H */
    86.