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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | #ifndef _FENV_H_ |
| 2 | #define _FENV_H_ |
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| 3 | |||
| 4 | /* FPU status word exception flags */ |
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| 5 | #define FE_INVALID 0x01 |
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| 6 | #define FE_DENORMAL 0x02 |
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| 7 | #define FE_DIVBYZERO 0x04 |
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| 8 | #define FE_OVERFLOW 0x08 |
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| 9 | #define FE_UNDERFLOW 0x10 |
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| 10 | #define FE_INEXACT 0x20 |
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| 11 | #define FE_ALL_EXCEPT (FE_INVALID | FE_DENORMAL | FE_DIVBYZERO \ |
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| 12 | | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT) |
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| 13 | |||
| 14 | /* FPU control word rounding flags */ |
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| 15 | #define FE_TONEAREST 0x0000 |
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| 16 | #define FE_DOWNWARD 0x0400 |
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| 17 | #define FE_UPWARD 0x0800 |
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| 18 | #define FE_TOWARDZERO 0x0c00 |
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| 19 | |||
| 20 | /* The MXCSR exception flags are the same as the |
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| 21 | FE flags. */ |
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| 22 | #define __MXCSR_EXCEPT_FLAG_SHIFT 0 |
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| 23 | |||
| 24 | /* How much to shift FE status word exception flags |
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| 25 | to get the MXCSR exeptions masks, */ |
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| 26 | #define __MXCSR_EXCEPT_MASK_SHIFT 7 |
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| 27 | |||
| 28 | /* How much to shift FE control word rounding flags |
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| 29 | to get MXCSR rounding flags, */ |
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| 30 | #define __MXCSR_ROUND_FLAG_SHIFT 3 |
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| 31 | |||
| 32 | #ifndef RC_INVOKED |
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| 33 | /* |
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| 34 | For now, support only for the basic abstraction of flags that are |
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| 35 | either set or clear. fexcept_t could be structure that holds more |
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| 36 | info about the fp environment. |
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| 37 | */ |
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| 38 | typedef unsigned short fexcept_t; |
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| 39 | |||
| 40 | /* This 32-byte struct represents the entire floating point |
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| 41 | environment as stored by fnstenv or fstenv, augmented by |
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| 42 | the contents of the MXCSR register, as stored by stmxcsr |
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| 43 | (if CPU supports it). */ |
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| 44 | typedef struct |
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| 45 | { |
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| 46 | unsigned short __control_word; |
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| 47 | unsigned short __unused0; |
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| 48 | unsigned short __status_word; |
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| 49 | unsigned short __unused1; |
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| 50 | unsigned short __tag_word; |
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| 51 | unsigned short __unused2; |
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| 52 | unsigned int __ip_offset; /* instruction pointer offset */ |
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| 53 | unsigned short __ip_selector; |
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| 54 | unsigned short __opcode; |
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| 55 | unsigned int __data_offset; |
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| 56 | unsigned short __data_selector; |
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| 57 | unsigned short __unused3; |
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| 58 | unsigned int __mxcsr; /* contents of the MXCSR register */ |
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| 59 | } fenv_t; |
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| 60 | |||
| 61 | |||
| 62 | /*The C99 standard (7.6.9) allows us to define implementation-specific macros for |
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| 63 | different fp environments */ |
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| 64 | |||
| 65 | /* The default Intel x87 floating point environment (64-bit mantissa) */ |
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| 66 | #define FE_PC64_ENV ((const fenv_t *)-1) |
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| 67 | |||
| 68 | /* The floating point environment set by MSVCRT _fpreset (53-bit mantissa) */ |
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| 69 | #define FE_PC53_ENV ((const fenv_t *)-2) |
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| 70 | |||
| 71 | /* The FE_DFL_ENV macro is required by standard. |
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| 72 | fesetenv will use the environment set at app startup.*/ |
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| 73 | #define FE_DFL_ENV ((const fenv_t *) 0) |
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| 74 | |||
| 75 | #ifdef __cplusplus |
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| 76 | extern "C" { |
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| 77 | #endif |
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| 78 | |||
| 79 | /*TODO: Some of these could be inlined */ |
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| 80 | /* 7.6.2 Exception */ |
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| 81 | |||
| 82 | extern int __cdecl feclearexcept (int); |
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| 83 | extern int __cdecl fegetexceptflag (fexcept_t * flagp, int excepts); |
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| 84 | extern int __cdecl feraiseexcept (int excepts ); |
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| 85 | extern int __cdecl fesetexceptflag (const fexcept_t *, int); |
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| 86 | extern int __cdecl fetestexcept (int excepts); |
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| 87 | |||
| 88 | /* 7.6.3 Rounding */ |
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| 89 | |||
| 90 | extern int __cdecl fegetround (void); |
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| 91 | extern int __cdecl fesetround (int mode); |
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| 92 | |||
| 93 | /* 7.6.4 Environment */ |
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| 94 | |||
| 95 | extern int __cdecl fegetenv (fenv_t * envp); |
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| 96 | extern int __cdecl fesetenv (const fenv_t * ); |
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| 97 | extern int __cdecl feupdateenv (const fenv_t *); |
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| 98 | extern int __cdecl feholdexcept (fenv_t *); |
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| 99 | |||
| 100 | #ifdef __cplusplus |
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| 101 | } |
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| 102 | #endif |
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| 103 | #endif /* Not RC_INVOKED */ |
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| 104 | |||
| 105 | #endif /* ndef _FENV_H */ |