1 /** 2 * This file has no copyright assigned and is placed in the Public Domain. 3 * This file is part of the mingw-w64 runtime package. 4 * No warranty is given; refer to the file DISCLAIMER.PD within this package. 5 */ 6 #ifndef _FENV_H_ 7 #define _FENV_H_ 8 9 #include <crtdefs.h> 10 11 /* FPU status word exception flags */ 12 #define FE_INVALID 0x01 13 #define FE_DENORMAL 0x02 14 #define FE_DIVBYZERO 0x04 15 #define FE_OVERFLOW 0x08 16 #define FE_UNDERFLOW 0x10 17 #define FE_INEXACT 0x20 18 #define FE_ALL_EXCEPT (FE_INVALID | FE_DENORMAL | FE_DIVBYZERO \ 19 | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT) 20 21 /* FPU control word rounding flags */ 22 #define FE_TONEAREST 0x0000 23 #define FE_DOWNWARD 0x0400 24 #define FE_UPWARD 0x0800 25 #define FE_TOWARDZERO 0x0c00 26 27 /* The MXCSR exception flags are the same as the 28 FE flags. */ 29 #define __MXCSR_EXCEPT_FLAG_SHIFT 0 30 31 /* How much to shift FE status word exception flags 32 to get the MXCSR exeptions masks, */ 33 #define __MXCSR_EXCEPT_MASK_SHIFT 7 34 35 /* How much to shift FE status word exception flags 36 to get MXCSR rounding flags, */ 37 #define __MXCSR_ROUND_FLAG_SHIFT 3 38 39 #ifndef RC_INVOKED 40 /* 41 For now, support only for the basic abstraction of flags that are 42 either set or clear. fexcept_t could be structure that holds more 43 info about the fp environment. 44 */ 45 typedef unsigned short fexcept_t; 46 47 /* This 32-byte struct represents the entire floating point 48 environment as stored by fnstenv or fstenv, augmented by 49 the contents of the MXCSR register, as stored by stmxcsr 50 (if CPU supports it). */ 51 typedef struct 52 { 53 unsigned short __control_word; 54 unsigned short __unused0; 55 unsigned short __status_word; 56 unsigned short __unused1; 57 unsigned short __tag_word; 58 unsigned short __unused2; 59 unsigned int __ip_offset; /* instruction pointer offset */ 60 unsigned short __ip_selector; 61 unsigned short __opcode; 62 unsigned int __data_offset; 63 unsigned short __data_selector; 64 unsigned short __unused3; 65 unsigned int __mxcsr; /* contents of the MXCSR register */ 66 } fenv_t; 67 68 69 /*The C99 standard (7.6.9) allows us to define implementation-specific macros for 70 different fp environments */ 71 72 /* The default Intel x87 floating point environment (64-bit mantissa) */ 73 #define FE_PC64_ENV ((const fenv_t *)-1) 74 75 /* The floating point environment set by MSVCRT _fpreset (53-bit mantissa) */ 76 #define FE_PC53_ENV ((const fenv_t *)-2) 77 78 /* The FE_DFL_ENV macro is required by standard. 79 fesetenv will use the environment set at app startup.*/ 80 #define FE_DFL_ENV ((const fenv_t *) 0) 81 82 #ifdef __cplusplus 83 extern "C" { 84 #endif 85 86 /*TODO: Some of these could be inlined */ 87 /* 7.6.2 Exception */ 88 89 extern int __cdecl feclearexcept (int); 90 extern int __cdecl fegetexceptflag (fexcept_t * flagp, int excepts); 91 extern int __cdecl feraiseexcept (int excepts ); 92 extern int __cdecl fesetexceptflag (const fexcept_t *, int); 93 extern int __cdecl fetestexcept (int excepts); 94 95 /* 7.6.3 Rounding */ 96 97 extern int __cdecl fegetround (void); 98 extern int __cdecl fesetround (int mode); 99 100 /* 7.6.4 Environment */ 101 102 extern int __cdecl fegetenv(fenv_t * envp); 103 extern int __cdecl fesetenv(const fenv_t * ); 104 extern int __cdecl feupdateenv(const fenv_t *); 105 extern int __cdecl feholdexcept(fenv_t *); 106 107 #ifdef __cplusplus 108 } 109 #endif 110 #endif /* Not RC_INVOKED */ 111 112 #endif /* ndef _FENV_H */ 113
