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 #if defined(_ARM_) || defined(__arm__) || defined(_ARM64_) || defined(__aarch64__) 12 13 /* FPU status word exception flags */ 14 #define FE_INVALID 0x01 15 #define FE_DIVBYZERO 0x02 16 #define FE_OVERFLOW 0x04 17 #define FE_UNDERFLOW 0x08 18 #define FE_INEXACT 0x10 19 #define FE_ALL_EXCEPT (FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT) 20 21 /* FPU control word rounding flags */ 22 #define FE_TONEAREST 0x00000000 23 #define FE_UPWARD 0x00400000 24 #define FE_DOWNWARD 0x00800000 25 #define FE_TOWARDZERO 0x00c00000 26 27 /* Amount to shift by to convert an exception to a mask bit. */ 28 #define FE_EXCEPT_SHIFT 0x08 29 30 #else 31 32 #define FE_INVALID 0x01 33 #define FE_DENORMAL 0x02 34 #define FE_DIVBYZERO 0x04 35 #define FE_OVERFLOW 0x08 36 #define FE_UNDERFLOW 0x10 37 #define FE_INEXACT 0x20 38 #define FE_ALL_EXCEPT (FE_INVALID | FE_DENORMAL | FE_DIVBYZERO \ 39 | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT) 40 41 /* FPU control word rounding flags */ 42 #define FE_TONEAREST 0x0000 43 #define FE_DOWNWARD 0x0400 44 #define FE_UPWARD 0x0800 45 #define FE_TOWARDZERO 0x0c00 46 47 /* The MXCSR exception flags are the same as the 48 FE flags. */ 49 #define __MXCSR_EXCEPT_FLAG_SHIFT 0 50 51 /* How much to shift FE status word exception flags 52 to get the MXCSR exeptions masks, */ 53 #define __MXCSR_EXCEPT_MASK_SHIFT 7 54 55 /* How much to shift FE status word exception flags 56 to get MXCSR rounding flags, */ 57 #define __MXCSR_ROUND_FLAG_SHIFT 3 58 59 #endif /* defined(_ARM_) || defined(__arm__) */ 60 61 #ifndef RC_INVOKED 62 63 #if defined(_ARM_) || defined(__arm__) || defined(_ARM64_) || defined(__aarch64__) 64 65 /* Type representing exception flags. */ 66 typedef unsigned int fexcept_t; 67 68 /* Type representing floating-point environment. */ 69 typedef struct 70 { 71 unsigned int __cw; 72 } fenv_t; 73 74 /* If the default argument is used we use this value. */ 75 #define FE_DFL_ENV ((const fenv_t *) -1l) 76 77 #else 78 79 /* 80 For now, support only for the basic abstraction of flags that are 81 either set or clear. fexcept_t could be structure that holds more 82 info about the fp environment. 83 */ 84 typedef unsigned short fexcept_t; 85 86 /* This 32-byte struct represents the entire floating point 87 environment as stored by fnstenv or fstenv, augmented by 88 the contents of the MXCSR register, as stored by stmxcsr 89 (if CPU supports it). */ 90 typedef struct 91 { 92 unsigned short __control_word; 93 unsigned short __unused0; 94 unsigned short __status_word; 95 unsigned short __unused1; 96 unsigned short __tag_word; 97 unsigned short __unused2; 98 unsigned int __ip_offset; /* instruction pointer offset */ 99 unsigned short __ip_selector; 100 unsigned short __opcode; 101 unsigned int __data_offset; 102 unsigned short __data_selector; 103 unsigned short __unused3; 104 unsigned int __mxcsr; /* contents of the MXCSR register */ 105 } fenv_t; 106 107 108 /*The C99 standard (7.6.9) allows us to define implementation-specific macros for 109 different fp environments */ 110 111 /* The default Intel x87 floating point environment (64-bit mantissa) */ 112 #define FE_PC64_ENV ((const fenv_t *)-1) 113 114 /* The floating point environment set by MSVCRT _fpreset (53-bit mantissa) */ 115 #define FE_PC53_ENV ((const fenv_t *)-2) 116 117 /* The FE_DFL_ENV macro is required by standard. 118 fesetenv will use the environment set at app startup.*/ 119 #define FE_DFL_ENV ((const fenv_t *) 0) 120 121 #endif /* defined(_ARM_) || defined(__arm__) */ 122 123 #ifdef __cplusplus 124 extern "C" { 125 #endif 126 127 /*TODO: Some of these could be inlined */ 128 /* 7.6.2 Exception */ 129 130 extern int __cdecl feclearexcept (int); 131 extern int __cdecl fegetexceptflag (fexcept_t * flagp, int excepts); 132 extern int __cdecl feraiseexcept (int excepts ); 133 extern int __cdecl fesetexceptflag (const fexcept_t *, int); 134 extern int __cdecl fetestexcept (int excepts); 135 136 /* 7.6.3 Rounding */ 137 138 extern int __cdecl fegetround (void); 139 extern int __cdecl fesetround (int mode); 140 141 /* 7.6.4 Environment */ 142 143 extern int __cdecl fegetenv(fenv_t * envp); 144 extern int __cdecl fesetenv(const fenv_t * ); 145 extern int __cdecl feupdateenv(const fenv_t *); 146 extern int __cdecl feholdexcept(fenv_t *); 147 148 #ifdef __cplusplus 149 } 150 #endif 151 #endif /* Not RC_INVOKED */ 152 153 #endif /* ndef _FENV_H */ 154