2 * Copyright (c) 2004-2011 David Schultz <das@FreeBSD.ORG>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
30 #error "This file is meant to be included only by <fenv.h>."
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:
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
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.
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);
60 __fenv_static inline int
61 feclearexcept(int __excepts)
64 __softfloat_float_exception_flags &= ~__excepts;
68 __fenv_static inline int
69 fegetexceptflag(fexcept_t *__flagp, int __excepts)
72 *__flagp = __softfloat_float_exception_flags & __excepts;
76 __fenv_static inline int
77 fesetexceptflag(const fexcept_t *__flagp, int __excepts)
80 __softfloat_float_exception_flags &= ~__excepts;
81 __softfloat_float_exception_flags |= *__flagp & __excepts;
85 __fenv_static inline int
86 feraiseexcept(int __excepts)
89 __softfloat_float_raise(__excepts);
93 __fenv_static inline int
94 fetestexcept(int __excepts)
97 return (__softfloat_float_exception_flags & __excepts);
100 __fenv_static inline int
104 return (__softfloat_float_rounding_mode);
107 __fenv_static inline int
108 fesetround(int __round)
111 __softfloat_float_rounding_mode = __round;
115 __fenv_static inline int
116 fegetenv(fenv_t *__envp)
119 __set_env(*__envp, __softfloat_float_exception_flags,
120 __softfloat_float_exception_mask, __softfloat_float_rounding_mode);
124 __fenv_static inline int
125 feholdexcept(fenv_t *__envp)
130 __softfloat_float_exception_flags = 0;
131 __softfloat_float_exception_mask = 0;
135 __fenv_static inline int
136 fesetenv(const fenv_t *__envp)
139 __softfloat_float_exception_flags = __env_flags(*__envp);
140 __softfloat_float_exception_mask = __env_mask(*__envp);
141 __softfloat_float_rounding_mode = __env_round(*__envp);
145 __fenv_static inline int
146 feupdateenv(const fenv_t *__envp)
148 int __oflags = __softfloat_float_exception_flags;
151 feraiseexcept(__oflags);
157 /* We currently provide no external definitions of the functions below. */
159 __fenv_static inline int
160 feenableexcept(int __mask)
162 int __omask = __softfloat_float_exception_mask;
164 __softfloat_float_exception_mask |= __mask;
168 __fenv_static inline int
169 fedisableexcept(int __mask)
171 int __omask = __softfloat_float_exception_mask;
173 __softfloat_float_exception_mask &= ~__mask;
177 __fenv_static inline int
181 return (__softfloat_float_exception_mask);
184 #endif /* __BSD_VISIBLE */