| 1 | /*␊ |
| 2 | * Copyright (c) 2002 Apple Computer, Inc. All rights reserved.␊ |
| 3 | *␊ |
| 4 | * @APPLE_LICENSE_HEADER_START@␊ |
| 5 | * ␊ |
| 6 | * The contents of this file constitute Original Code as defined in and␊ |
| 7 | * are subject to the Apple Public Source License Version 1.1 (the␊ |
| 8 | * "License"). You may not use this file except in compliance with the␊ |
| 9 | * License. Please obtain a copy of the License at␊ |
| 10 | * http://www.apple.com/publicsource and read it before using this file.␊ |
| 11 | * ␊ |
| 12 | * This Original Code and all software distributed under the License are␊ |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the␊ |
| 17 | * License for the specific language governing rights and limitations␊ |
| 18 | * under the License.␊ |
| 19 | * ␊ |
| 20 | * @APPLE_LICENSE_HEADER_END@␊ |
| 21 | */␊ |
| 22 | ␊ |
| 23 | /*******************************************************************************␊ |
| 24 | * *␊ |
| 25 | * File: fenv.h␉ *␊ |
| 26 | * *␊ |
| 27 | * Contains: typedefs and prototypes for C99 floating point environment. *␊ |
| 28 | * *␊ |
| 29 | *******************************************************************************/␊ |
| 30 | ␊ |
| 31 | #ifndef __FENV__␊ |
| 32 | #define __FENV__␊ |
| 33 | ␊ |
| 34 | #if defined( __i386__ ) || defined( __x86_64__ )␊ |
| 35 | #error Wrong arch. This is PowerPC only.␊ |
| 36 | #endif␊ |
| 37 | ␊ |
| 38 | #if defined(__GNUC__) && (__GNUC__ >= 4) ␊ |
| 39 | #pragma GCC fenv␊ |
| 40 | #endif␊ |
| 41 | ␊ |
| 42 | #ifdef __cplusplus␊ |
| 43 | extern "C" {␊ |
| 44 | #endif␊ |
| 45 | ␊ |
| 46 | /*␊ |
| 47 | A collection of functions designed to provide access to the floating␊ |
| 48 | point environment for numerical programming. It is modeled after␊ |
| 49 | the floating-point requirements in C9X.␊ |
| 50 | ␊ |
| 51 | The file <fenv.h> declares many functions in support of numerical␊ |
| 52 | programming. Programs that test flags or run under␊ |
| 53 | non-default modes must do so under the effect of an enabling␊ |
| 54 | "fenv_access" pragma.␊ |
| 55 | */␊ |
| 56 | ␊ |
| 57 | /********************************************************************************␊ |
| 58 | * *␊ |
| 59 | * fenv_t is a type for representing the entire floating-point *␊ |
| 60 | * environment in a single object. *␊ |
| 61 | * *␊ |
| 62 | * fexcept_t is a type for representing the floating-point *␊ |
| 63 | * exception flag state collectively. *␊ |
| 64 | * *␊ |
| 65 | ********************************************************************************/␊ |
| 66 | typedef unsigned int␉␉␉fenv_t;␊ |
| 67 | typedef unsigned int␉␉␉fexcept_t;␊ |
| 68 | ␊ |
| 69 | /* Definitions of floating-point exception macros */␊ |
| 70 | #define FE_INEXACT 0x02000000␊ |
| 71 | #define FE_DIVBYZERO 0x04000000␊ |
| 72 | #define FE_UNDERFLOW 0x08000000␊ |
| 73 | #define FE_OVERFLOW 0x10000000␊ |
| 74 | #define FE_INVALID 0x20000000␊ |
| 75 | #define FE_ALL_EXCEPT 0x3E000000␊ |
| 76 | ␊ |
| 77 | /* Definitions of rounding direction macros */␊ |
| 78 | #define FE_TONEAREST 0x00000000␊ |
| 79 | #define FE_TOWARDZERO 0x00000001␊ |
| 80 | #define FE_UPWARD 0x00000002␊ |
| 81 | #define FE_DOWNWARD 0x00000003␊ |
| 82 | ␊ |
| 83 | /* default environment object */␊ |
| 84 | extern const fenv_t _FE_DFL_ENV;␊ |
| 85 | #define FE_DFL_ENV &_FE_DFL_ENV /* pointer to default environment */␊ |
| 86 | ␊ |
| 87 | /*******************************************************************************␊ |
| 88 | * The following functions provide access to the exception flags. The *␊ |
| 89 | * "int" input argument can be constructed by bitwise ORs of the exception *␊ |
| 90 | * macros: for example: FE_OVERFLOW | FE_INEXACT. *␊ |
| 91 | *******************************************************************************/␊ |
| 92 | ␊ |
| 93 | /*******************************************************************************␊ |
| 94 | * The function "feclearexcept" clears the supported exceptions represented *␊ |
| 95 | * by its argument. *␊ |
| 96 | *******************************************************************************/␊ |
| 97 | ␊ |
| 98 | extern int feclearexcept(int);␊ |
| 99 | ␊ |
| 100 | ␊ |
| 101 | /*******************************************************************************␊ |
| 102 | * The function "fegetexceptflag" stores a representation of the exception *␊ |
| 103 | * flags indicated by its integer argument through the fexcept_t pointer *␊ |
| 104 | * argument. *␊ |
| 105 | *******************************************************************************/␊ |
| 106 | ␊ |
| 107 | extern int fegetexceptflag(fexcept_t *, int);␊ |
| 108 | ␊ |
| 109 | ␊ |
| 110 | /*******************************************************************************␊ |
| 111 | * The function "feraiseexcept" raises the supported exceptions *␊ |
| 112 | * represented by its argument. *␊ |
| 113 | *******************************************************************************/␊ |
| 114 | ␊ |
| 115 | extern int feraiseexcept(int);␊ |
| 116 | ␊ |
| 117 | ␊ |
| 118 | /*******************************************************************************␊ |
| 119 | * The function "fesetexceptflag" sets or clears the exception flags indicated *␊ |
| 120 | * by the its integer argument according to the representation in the *␊ |
| 121 | * object pointed to by the fexcept_t pointer argument. The value of the *␊ |
| 122 | * object must have been set by a previous call to "fegetexceptflag". *␊ |
| 123 | * This function does not raise exceptions; it just sets the state of *␊ |
| 124 | * the flags. *␊ |
| 125 | *******************************************************************************/␊ |
| 126 | ␊ |
| 127 | extern int fesetexceptflag(const fexcept_t *, int);␊ |
| 128 | ␊ |
| 129 | ␊ |
| 130 | /*******************************************************************************␊ |
| 131 | * The function "fetestexcept" determines which of the specified subset of *␊ |
| 132 | * the exception flags are currently set. The integer argument specifies *␊ |
| 133 | * the exception flags to be queried as a bitwise OR of the exception *␊ |
| 134 | * macros. This function returns the bitwise OR of the exception macros *␊ |
| 135 | * corresponding to the currently set exceptions included in "excepts". *␊ |
| 136 | *******************************************************************************/␊ |
| 137 | ␊ |
| 138 | extern int fetestexcept(int);␊ |
| 139 | ␊ |
| 140 | ␊ |
| 141 | /*******************************************************************************␊ |
| 142 | * The following functions provide control of rounding direction modes. *␊ |
| 143 | *******************************************************************************/␊ |
| 144 | ␊ |
| 145 | /*******************************************************************************␊ |
| 146 | * The function "fegetround" returns the value of the rounding direction *␊ |
| 147 | * macro which represents the current rounding direction. *␊ |
| 148 | *******************************************************************************/␊ |
| 149 | ␊ |
| 150 | extern int fegetround(void);␊ |
| 151 | ␊ |
| 152 | ␊ |
| 153 | /*******************************************************************************␊ |
| 154 | * The function "fesetround" establishes the rounding direction represented *␊ |
| 155 | * by its argument. It returns zero if and only if the argument matches *␊ |
| 156 | * a rounding direction macro. If not, the rounding direction is not *␊ |
| 157 | * changed. *␊ |
| 158 | *******************************************************************************/␊ |
| 159 | ␊ |
| 160 | extern int fesetround(int);␊ |
| 161 | ␊ |
| 162 | ␊ |
| 163 | /*******************************************************************************␊ |
| 164 | * The following functions manage the floating-point environment, exception *␊ |
| 165 | * flags and dynamic modes, as one entity. *␊ |
| 166 | *******************************************************************************/␊ |
| 167 | ␊ |
| 168 | extern int fegetenv(fenv_t *);␊ |
| 169 | extern int feholdexcept(fenv_t *);␊ |
| 170 | extern int fesetenv(const fenv_t *);␊ |
| 171 | extern int feupdateenv(const fenv_t *);␊ |
| 172 | ␊ |
| 173 | ␊ |
| 174 | #ifdef __cplusplus␊ |
| 175 | }␊ |
| 176 | #endif␊ |
| 177 | ␊ |
| 178 | #endif /* __FENV__ */␊ |
| 179 | ␊ |
| 180 | |
