2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2004-2011 David Schultz <das@FreeBSD.ORG>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #error "This file is meant to be included only by <fenv.h>."
36 * This file implements the functionality of <fenv.h> on platforms that
37 * lack an FPU and use softfloat in libc for floating point. To use it,
38 * you must write an <fenv.h> that provides the following:
40 * - a typedef for fenv_t, which may be an integer or struct type
41 * - a typedef for fexcept_t (XXX This file assumes fexcept_t is a
42 * simple integer type containing the exception mask.)
43 * - definitions of FE_* constants for the five exceptions and four
44 * rounding modes in IEEE 754, as described in fenv(3)
45 * - a definition, and the corresponding external symbol, for FE_DFL_ENV
46 * - a macro __set_env(env, flags, mask, rnd), which sets the given fenv_t
47 * from the exception flags, mask, and rounding mode
48 * - macros __env_flags(env), __env_mask(env), and __env_round(env), which
49 * extract fields from an fenv_t
50 * - a definition of __fenv_static
52 * If the architecture supports an optional FPU, it's recommended that you
53 * define fenv_t and fexcept_t to match the hardware ABI. Otherwise, it
54 * doesn't matter how you define them.
57 extern int __softfloat_float_exception_flags;
58 extern int __softfloat_float_exception_mask;
59 extern int __softfloat_float_rounding_mode;
60 void __softfloat_float_raise(int);
62 __fenv_static inline int
63 feclearexcept(int __excepts)
66 __softfloat_float_exception_flags &= ~__excepts;
70 __fenv_static inline int
71 fegetexceptflag(fexcept_t *__flagp, int __excepts)
74 *__flagp = __softfloat_float_exception_flags & __excepts;
78 __fenv_static inline int
79 fesetexceptflag(const fexcept_t *__flagp, int __excepts)
82 __softfloat_float_exception_flags &= ~__excepts;
83 __softfloat_float_exception_flags |= *__flagp & __excepts;
87 __fenv_static inline int
88 feraiseexcept(int __excepts)
91 __softfloat_float_raise(__excepts);
95 __fenv_static inline int
96 fetestexcept(int __excepts)
99 return (__softfloat_float_exception_flags & __excepts);
102 __fenv_static inline int
106 return (__softfloat_float_rounding_mode);
109 __fenv_static inline int
110 fesetround(int __round)
113 __softfloat_float_rounding_mode = __round;
117 __fenv_static inline int
118 fegetenv(fenv_t *__envp)
121 __set_env(*__envp, __softfloat_float_exception_flags,
122 __softfloat_float_exception_mask, __softfloat_float_rounding_mode);
126 __fenv_static inline int
127 feholdexcept(fenv_t *__envp)
132 __softfloat_float_exception_flags = 0;
133 __softfloat_float_exception_mask = 0;
137 __fenv_static inline int
138 fesetenv(const fenv_t *__envp)
141 __softfloat_float_exception_flags = __env_flags(*__envp);
142 __softfloat_float_exception_mask = __env_mask(*__envp);
143 __softfloat_float_rounding_mode = __env_round(*__envp);
147 __fenv_static inline int
148 feupdateenv(const fenv_t *__envp)
150 int __oflags = __softfloat_float_exception_flags;
153 feraiseexcept(__oflags);
159 /* We currently provide no external definitions of the functions below. */
161 __fenv_static inline int
162 feenableexcept(int __mask)
164 int __omask = __softfloat_float_exception_mask;
166 __softfloat_float_exception_mask |= __mask;
170 __fenv_static inline int
171 fedisableexcept(int __mask)
173 int __omask = __softfloat_float_exception_mask;
175 __softfloat_float_exception_mask &= ~__mask;
179 __fenv_static inline int
183 return (__softfloat_float_exception_mask);
186 #endif /* __BSD_VISIBLE */