92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
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#ifndef _FENV_H_
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#define _FENV_H_
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/* FPU status word exception flags */
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#define FE_INVALID 0x01
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#define FE_DENORMAL 0x02
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#define FE_DIVBYZERO 0x04
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#define FE_OVERFLOW 0x08
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#define FE_UNDERFLOW 0x10
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#define FE_INEXACT 0x20
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#define FE_ALL_EXCEPT (FE_INVALID | FE_DENORMAL | FE_DIVBYZERO \
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| FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)
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/* FPU control word rounding flags */
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#define FE_TONEAREST 0x0000
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#define FE_DOWNWARD 0x0400
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#define FE_UPWARD 0x0800
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#define FE_TOWARDZERO 0x0c00
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#ifndef RC_INVOKED
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/*
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For now, support only for the basic abstraction of flags that are
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either set or clear. fexcept_t could be structure that holds more
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info about the fp environment.
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*/
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typedef unsigned short fexcept_t;
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/* This 28-byte struct represents the entire floating point
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environment as stored by fnstenv or fstenv */
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typedef struct
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{
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unsigned short __control_word;
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unsigned short __unused0;
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unsigned short __status_word;
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unsigned short __unused1;
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unsigned short __tag_word;
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unsigned short __unused2;
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unsigned int __ip_offset; /* instruction pointer offset */
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unsigned short __ip_selector;
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unsigned short __opcode;
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unsigned int __data_offset;
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unsigned short __data_selector;
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unsigned short __unused3;
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} fenv_t;
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/*The C99 standard (7.6.9) allows us to define implementation-specific macros for
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different fp environments */
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/* The default Intel x87 floating point environment (64-bit mantissa) */
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#define FE_PC64_ENV ((const fenv_t *)-1)
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/* The floating point environment set by MSVCRT _fpreset (53-bit mantissa) */
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#define FE_PC53_ENV ((const fenv_t *)-2)
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/* The FE_DFL_ENV macro is required by standard.
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fesetenv will use the environment set at app startup.*/
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#define FE_DFL_ENV ((const fenv_t *) 0)
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*TODO: Some of these could be inlined */
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/* 7.6.2 Exception */
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extern int feclearexcept (int);
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extern int fegetexceptflag (fexcept_t * flagp, int excepts);
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extern int feraiseexcept (int excepts );
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extern int fesetexceptflag (const fexcept_t *, int);
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extern int fetestexcept (int excepts);
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/* 7.6.3 Rounding */
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extern int fegetround (void);
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extern int fesetround (int mode);
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/* 7.6.4 Environment */
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extern int fegetenv (fenv_t * envp);
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extern int fesetenv (const fenv_t * );
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extern int feupdateenv (const fenv_t *);
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extern int feholdexcept (fenv_t *);
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#ifdef __cplusplus
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}
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#endif
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#endif /* Not RC_INVOKED */
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#endif /* ndef _FENV_H */
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