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