win32/include/fenv.h

   1 #ifndef _FENV_H
   2 #define _FENV_H
   3
   4 /*
   5   For now, support only for the basic abstraction of flags that are
   6   either set or clear. fexcept_t could be  structure that holds more info
   7   about the fp environment.
   8 */
   9 typedef unsigned short fexcept_t;
  10
  11 /* This 28-byte struct represents the entire floating point
  12    environment as stored by fnstenv or fstenv */
  13 typedef struct
  14 {
  15   unsigned short __control_word;
  16   unsigned short __unused0;
  17   unsigned short __status_word;
  18   unsigned short __unused1;
  19   unsigned short __tag_word;
  20   unsigned short __unused2;
  21   unsigned int   __ip_offset;    /* instruction pointer offset */
  22   unsigned short __ip_selector;
  23   unsigned short __opcode;
  24   unsigned int   __data_offset;
  25   unsigned short __data_selector;
  26   unsigned short __unused3;
  27 } fenv_t;
  28
  29
  30 /* FPU status word exception flags */
  31 #define FE_INVALID      0x01
  32 #define FE_DENORMAL     0x02
  33 #define FE_DIVBYZERO    0x04
  34 #define FE_OVERFLOW     0x08
  35 #define FE_UNDERFLOW    0x10
  36 #define FE_INEXACT      0x20
  37 #define FE_ALL_EXCEPT (FE_INVALID | FE_DENORMAL | FE_DIVBYZERO \
  38                        | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)
  39
  40 /* FPU control word rounding flags */
  41 #define FE_TONEAREST    0x0000
  42 #define FE_DOWNWARD     0x0400
  43 #define FE_UPWARD       0x0800
  44 #define FE_TOWARDZERO   0x0c00
  45
  46
  47 /* The default floating point environment */
  48 #define FE_DFL_ENV ((const fenv_t *)-1)
  49
  50
  51 #ifndef RC_INVOKED
  52 #ifdef __cplusplus
  53 extern "C" {
  54 #endif
  55
  56
  57 /*TODO: Some of these could be inlined */
  58 /* 7.6.2 Exception */
  59
  60 extern int feclearexcept (int);
  61 extern int fegetexceptflag (fexcept_t * flagp, int excepts);
  62 extern int feraiseexcept (int excepts );
  63 extern int fesetexceptflag (const fexcept_t *, int);
  64 extern int fetestexcept (int excepts);
  65
  66
  67 /* 7.6.3 Rounding */
  68
  69 extern int fegetround (void);
  70 extern int fesetround (int mode);
  71
  72
  73 /* 7.6.4 Environment */
  74
  75 extern int fegetenv (fenv_t * envp);
  76 extern int fesetenv (const fenv_t * );
  77 extern int feupdateenv (const fenv_t *);
  78 extern int feholdexcept (fenv_t *);
  79
  80 #ifdef __cplusplus
  81 }
  82 #endif
  83 #endif  /* Not RC_INVOKED */
  84
  85 #endif /* ndef _FENV_H */