184 lines
4.9 KiB
C
184 lines
4.9 KiB
C
/*-
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* Copyright (c) 2004-2011 David Schultz <das@FreeBSD.ORG>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _FENV_H_
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#error "This file is meant to be included only by <fenv.h>."
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#endif
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/*
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* This file implements the functionality of <fenv.h> on platforms that
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* lack an FPU and use softfloat in libc for floating point. To use it,
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* you must write an <fenv.h> that provides the following:
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*
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* - a typedef for fenv_t, which may be an integer or struct type
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* - a typedef for fexcept_t (XXX This file assumes fexcept_t is a
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* simple integer type containing the exception mask.)
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* - definitions of FE_* constants for the five exceptions and four
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* rounding modes in IEEE 754, as described in fenv(3)
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* - a definition, and the corresponding external symbol, for FE_DFL_ENV
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* - a macro __set_env(env, flags, mask, rnd), which sets the given fenv_t
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* from the exception flags, mask, and rounding mode
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* - macros __env_flags(env), __env_mask(env), and __env_round(env), which
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* extract fields from an fenv_t
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* - a definition of __fenv_static
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*
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* If the architecture supports an optional FPU, it's recommended that you
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* define fenv_t and fexcept_t to match the hardware ABI. Otherwise, it
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* doesn't matter how you define them.
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*/
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extern int __softfloat_float_exception_flags;
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extern int __softfloat_float_exception_mask;
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extern int __softfloat_float_rounding_mode;
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__fenv_static inline int
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feclearexcept(int __excepts)
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{
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__softfloat_float_exception_flags &= ~__excepts;
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return (0);
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}
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__fenv_static inline int
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fegetexceptflag(fexcept_t *__flagp, int __excepts)
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{
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*__flagp = __softfloat_float_exception_flags & __excepts;
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return (0);
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}
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__fenv_static inline int
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fesetexceptflag(const fexcept_t *__flagp, int __excepts)
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{
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__softfloat_float_exception_flags &= ~__excepts;
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__softfloat_float_exception_flags |= *__flagp & __excepts;
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return (0);
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}
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__fenv_static inline int
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feraiseexcept(int __excepts)
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{
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__softfloat_float_exception_flags |= __excepts;
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return (0);
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}
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__fenv_static inline int
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fetestexcept(int __excepts)
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{
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return (__softfloat_float_exception_flags & __excepts);
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}
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__fenv_static inline int
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fegetround(void)
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{
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return (__softfloat_float_rounding_mode);
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}
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__fenv_static inline int
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fesetround(int __round)
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{
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__softfloat_float_rounding_mode = __round;
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return (0);
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}
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__fenv_static inline int
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fegetenv(fenv_t *__envp)
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{
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__set_env(*__envp, __softfloat_float_exception_flags,
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__softfloat_float_exception_mask, __softfloat_float_rounding_mode);
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return (0);
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}
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__fenv_static inline int
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feholdexcept(fenv_t *__envp)
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{
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fenv_t __env;
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fegetenv(__envp);
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__softfloat_float_exception_flags = 0;
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__softfloat_float_exception_mask = 0;
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return (0);
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}
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__fenv_static inline int
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fesetenv(const fenv_t *__envp)
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{
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__softfloat_float_exception_flags = __env_flags(*__envp);
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__softfloat_float_exception_mask = __env_mask(*__envp);
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__softfloat_float_rounding_mode = __env_round(*__envp);
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return (0);
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}
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__fenv_static inline int
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feupdateenv(const fenv_t *__envp)
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{
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int __oflags = __softfloat_float_exception_flags;
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fesetenv(__envp);
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feraiseexcept(__oflags);
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return (0);
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}
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#if __BSD_VISIBLE
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/* We currently provide no external definitions of the functions below. */
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__fenv_static inline int
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feenableexcept(int __mask)
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{
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int __omask = __softfloat_float_exception_mask;
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__softfloat_float_exception_mask |= __mask;
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return (__omask);
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}
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__fenv_static inline int
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fedisableexcept(int __mask)
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{
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int __omask = __softfloat_float_exception_mask;
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__softfloat_float_exception_mask &= ~__mask;
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return (__omask);
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}
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__fenv_static inline int
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fegetexcept(void)
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{
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return (__softfloat_float_exception_mask);
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}
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#endif /* __BSD_VISIBLE */
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