Elliott Hughes | a0ee078 | 2013-01-30 19:06:37 -0800 | [diff] [blame] | 1 | /*- |
| 2 | * Copyright (c) 2004-2011 David Schultz <das@FreeBSD.ORG> |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 24 | * SUCH DAMAGE. |
| 25 | * |
| 26 | * $FreeBSD$ |
| 27 | */ |
| 28 | |
| 29 | #ifndef _FENV_H_ |
| 30 | #error "This file is meant to be included only by <fenv.h>." |
| 31 | #endif |
| 32 | |
| 33 | /* |
| 34 | * This file implements the functionality of <fenv.h> on platforms that |
| 35 | * lack an FPU and use softfloat in libc for floating point. To use it, |
| 36 | * you must write an <fenv.h> that provides the following: |
| 37 | * |
| 38 | * - a typedef for fenv_t, which may be an integer or struct type |
| 39 | * - a typedef for fexcept_t (XXX This file assumes fexcept_t is a |
| 40 | * simple integer type containing the exception mask.) |
| 41 | * - definitions of FE_* constants for the five exceptions and four |
| 42 | * rounding modes in IEEE 754, as described in fenv(3) |
| 43 | * - a definition, and the corresponding external symbol, for FE_DFL_ENV |
| 44 | * - a macro __set_env(env, flags, mask, rnd), which sets the given fenv_t |
| 45 | * from the exception flags, mask, and rounding mode |
| 46 | * - macros __env_flags(env), __env_mask(env), and __env_round(env), which |
| 47 | * extract fields from an fenv_t |
| 48 | * - a definition of __fenv_static |
| 49 | * |
| 50 | * If the architecture supports an optional FPU, it's recommended that you |
| 51 | * define fenv_t and fexcept_t to match the hardware ABI. Otherwise, it |
| 52 | * doesn't matter how you define them. |
| 53 | */ |
| 54 | |
| 55 | extern int __softfloat_float_exception_flags; |
| 56 | extern int __softfloat_float_exception_mask; |
| 57 | extern int __softfloat_float_rounding_mode; |
| 58 | void __softfloat_float_raise(int); |
| 59 | |
| 60 | __fenv_static inline int |
| 61 | feclearexcept(int __excepts) |
| 62 | { |
| 63 | |
| 64 | __softfloat_float_exception_flags &= ~__excepts; |
| 65 | return (0); |
| 66 | } |
| 67 | |
| 68 | __fenv_static inline int |
| 69 | fegetexceptflag(fexcept_t *__flagp, int __excepts) |
| 70 | { |
| 71 | |
| 72 | *__flagp = __softfloat_float_exception_flags & __excepts; |
| 73 | return (0); |
| 74 | } |
| 75 | |
| 76 | __fenv_static inline int |
| 77 | fesetexceptflag(const fexcept_t *__flagp, int __excepts) |
| 78 | { |
| 79 | |
| 80 | __softfloat_float_exception_flags &= ~__excepts; |
| 81 | __softfloat_float_exception_flags |= *__flagp & __excepts; |
| 82 | return (0); |
| 83 | } |
| 84 | |
| 85 | __fenv_static inline int |
| 86 | feraiseexcept(int __excepts) |
| 87 | { |
| 88 | |
| 89 | __softfloat_float_raise(__excepts); |
| 90 | return (0); |
| 91 | } |
| 92 | |
| 93 | __fenv_static inline int |
| 94 | fetestexcept(int __excepts) |
| 95 | { |
| 96 | |
| 97 | return (__softfloat_float_exception_flags & __excepts); |
| 98 | } |
| 99 | |
| 100 | __fenv_static inline int |
| 101 | fegetround(void) |
| 102 | { |
| 103 | |
| 104 | return (__softfloat_float_rounding_mode); |
| 105 | } |
| 106 | |
| 107 | __fenv_static inline int |
| 108 | fesetround(int __round) |
| 109 | { |
| 110 | |
| 111 | __softfloat_float_rounding_mode = __round; |
| 112 | return (0); |
| 113 | } |
| 114 | |
| 115 | __fenv_static inline int |
| 116 | fegetenv(fenv_t *__envp) |
| 117 | { |
| 118 | |
| 119 | __set_env(*__envp, __softfloat_float_exception_flags, |
| 120 | __softfloat_float_exception_mask, __softfloat_float_rounding_mode); |
| 121 | return (0); |
| 122 | } |
| 123 | |
| 124 | __fenv_static inline int |
| 125 | feholdexcept(fenv_t *__envp) |
| 126 | { |
| 127 | fenv_t __env; |
| 128 | |
| 129 | fegetenv(__envp); |
| 130 | __softfloat_float_exception_flags = 0; |
| 131 | __softfloat_float_exception_mask = 0; |
| 132 | return (0); |
| 133 | } |
| 134 | |
| 135 | __fenv_static inline int |
| 136 | fesetenv(const fenv_t *__envp) |
| 137 | { |
| 138 | |
| 139 | __softfloat_float_exception_flags = __env_flags(*__envp); |
| 140 | __softfloat_float_exception_mask = __env_mask(*__envp); |
| 141 | __softfloat_float_rounding_mode = __env_round(*__envp); |
| 142 | return (0); |
| 143 | } |
| 144 | |
| 145 | __fenv_static inline int |
| 146 | feupdateenv(const fenv_t *__envp) |
| 147 | { |
| 148 | int __oflags = __softfloat_float_exception_flags; |
| 149 | |
| 150 | fesetenv(__envp); |
| 151 | feraiseexcept(__oflags); |
| 152 | return (0); |
| 153 | } |
| 154 | |
| 155 | #if __BSD_VISIBLE |
| 156 | |
| 157 | /* We currently provide no external definitions of the functions below. */ |
| 158 | |
| 159 | static inline int |
| 160 | feenableexcept(int __mask) |
| 161 | { |
| 162 | int __omask = __softfloat_float_exception_mask; |
| 163 | |
| 164 | __softfloat_float_exception_mask |= __mask; |
| 165 | return (__omask); |
| 166 | } |
| 167 | |
| 168 | static inline int |
| 169 | fedisableexcept(int __mask) |
| 170 | { |
| 171 | int __omask = __softfloat_float_exception_mask; |
| 172 | |
| 173 | __softfloat_float_exception_mask &= ~__mask; |
| 174 | return (__omask); |
| 175 | } |
| 176 | |
| 177 | static inline int |
| 178 | fegetexcept(void) |
| 179 | { |
| 180 | |
| 181 | return (__softfloat_float_exception_mask); |
| 182 | } |
| 183 | |
| 184 | #endif /* __BSD_VISIBLE */ |