include/crt/fenv.h

   1 #ifndef _FENV_H_
   2 #define _FENV_H_
   3
   4 #include <_mingw.h>
   5
   6 /* FPU status word exception flags */
   7 #define FE_INVALID      0x01
   8 #define FE_DENORMAL     0x02
   9 #define FE_DIVBYZERO    0x04
  10 #define FE_OVERFLOW     0x08
  11 #define FE_UNDERFLOW    0x10
  12 #define FE_INEXACT      0x20
  13 #define FE_ALL_EXCEPT (FE_INVALID | FE_DENORMAL | FE_DIVBYZERO \
  14                        | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)
  15
  16 /* FPU control word rounding flags */
  17 #define FE_TONEAREST    0x0000
  18 #define FE_DOWNWARD     0x0400
  19 #define FE_UPWARD       0x0800
  20 #define FE_TOWARDZERO   0x0c00
  21
  22 /* The MXCSR exception flags are the same as the
  23    FE flags. */
  24 #define __MXCSR_EXCEPT_FLAG_SHIFT 0
  25
  26 /* How much to shift FE status word exception flags
  27    to get the MXCSR exeptions masks,  */
  28 #define __MXCSR_EXCEPT_MASK_SHIFT 7
  29
  30 /* How much to shift FE control word rounding flags
  31    to get MXCSR rounding flags,  */
  32 #define __MXCSR_ROUND_FLAG_SHIFT 3
  33
  34 #ifndef RC_INVOKED
  35 /*
  36   For now, support only for the basic abstraction of flags that are
  37   either set or clear. fexcept_t could be  structure that holds more
  38   info about the fp environment.
  39 */
  40 typedef unsigned short fexcept_t;
  41
  42 /* This 32-byte struct represents the entire floating point
  43    environment as stored by fnstenv or fstenv, augmented by
  44    the  contents of the MXCSR register, as stored by stmxcsr
  45    (if CPU supports it). */
  46 typedef struct
  47 {
  48   unsigned short __control_word;
  49   unsigned short __unused0;
  50   unsigned short __status_word;
  51   unsigned short __unused1;
  52   unsigned short __tag_word;
  53   unsigned short __unused2;
  54   unsigned int   __ip_offset;    /* instruction pointer offset */
  55   unsigned short __ip_selector;
  56   unsigned short __opcode;
  57   unsigned int   __data_offset;
  58   unsigned short __data_selector;
  59   unsigned short  __unused3;
  60   unsigned int __mxcsr; /* contents of the MXCSR register  */
  61 } fenv_t;
  62
  63
  64 /*The C99 standard (7.6.9) allows us to define implementation-specific macros for
  65   different fp environments */
  66
  67 /* The default Intel x87 floating point environment (64-bit mantissa) */
  68 #define FE_PC64_ENV ((const fenv_t *)-1)
  69
  70 /* The floating point environment set by MSVCRT _fpreset (53-bit mantissa) */
  71 #define FE_PC53_ENV ((const fenv_t *)-2)
  72
  73 /* The FE_DFL_ENV macro is required by standard.
  74   fesetenv will use the environment set at app startup.*/
  75 #define FE_DFL_ENV ((const fenv_t *) 0)
  76
  77 #ifdef __cplusplus
  78 extern "C" {
  79 #endif
  80
  81 /*TODO: Some of these could be inlined */
  82 /* 7.6.2 Exception */
  83
  84 extern int __cdecl __MINGW_NOTHROW feclearexcept (int);
  85 extern int __cdecl __MINGW_NOTHROW fegetexceptflag (fexcept_t * flagp, int excepts);
  86 extern int __cdecl __MINGW_NOTHROW feraiseexcept (int excepts );
  87 extern int __cdecl __MINGW_NOTHROW fesetexceptflag (const fexcept_t *, int);
  88 extern int __cdecl __MINGW_NOTHROW fetestexcept (int excepts);
  89
  90 /* 7.6.3 Rounding */
  91
  92 extern int __cdecl __MINGW_NOTHROW fegetround (void);
  93 extern int __cdecl __MINGW_NOTHROW fesetround (int mode);
  94
  95 /* 7.6.4 Environment */
  96
  97 extern int __cdecl __MINGW_NOTHROW fegetenv (fenv_t * envp);
  98 extern int __cdecl __MINGW_NOTHROW fesetenv (const fenv_t * );
  99 extern int __cdecl __MINGW_NOTHROW feupdateenv (const fenv_t *);
 100 extern int __cdecl __MINGW_NOTHROW feholdexcept (fenv_t *);
 101
 102 #ifdef __cplusplus
 103 }
 104 #endif
 105 #endif  /* Not RC_INVOKED */
 106
 107 #endif /* ndef _FENV_H */