d78e594bc9
fenv.h that are currently inlined. The definitions are provided in fenv.c via 'extern inline' declaractions. This assumes the compiler handles 'extern inline' as specified in C99, which has been true under FreeBSD since 8.0. The goal is to eventually remove the 'static' keyword from the inline definitions in fenv.h, so that non-inlined references all wind up pointing to the same external definition like they're supposed to. I am deferring the second step to provide a window where newly-compiled apps will still link against old math libraries. (This isn't supported, but there's no need to cause undue breakage.) Reviewed by: stefanf, bde
224 lines
4.8 KiB
C
224 lines
4.8 KiB
C
/*-
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* Copyright (c) 2004-2005 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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#define _FENV_H_
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#include <sys/_types.h>
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#ifndef __fenv_static
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#define __fenv_static static
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#endif
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typedef __uint32_t fenv_t;
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typedef __uint32_t fexcept_t;
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/* Exception flags */
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#define FE_INVALID 0x0001
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#define FE_DIVBYZERO 0x0002
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#define FE_OVERFLOW 0x0004
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#define FE_UNDERFLOW 0x0008
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#define FE_INEXACT 0x0010
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#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
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FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
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/* Rounding modes */
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#define FE_TONEAREST 0x0000
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#define FE_TOWARDZERO 0x0001
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#define FE_UPWARD 0x0002
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#define FE_DOWNWARD 0x0003
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#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
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FE_UPWARD | FE_TOWARDZERO)
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__BEGIN_DECLS
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/* Default floating-point environment */
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extern const fenv_t __fe_dfl_env;
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#define FE_DFL_ENV (&__fe_dfl_env)
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/* We need to be able to map status flag positions to mask flag positions */
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#define _FPUSW_SHIFT 16
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#define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT)
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#ifdef ARM_HARD_FLOAT
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#define __rfs(__fpsr) __asm __volatile("rfs %0" : "=r" (*(__fpsr)))
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#define __wfs(__fpsr) __asm __volatile("wfs %0" : : "r" (__fpsr))
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#else
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#define __rfs(__fpsr)
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#define __wfs(__fpsr)
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#endif
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__fenv_static inline int
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feclearexcept(int __excepts)
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{
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fexcept_t __fpsr;
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__rfs(&__fpsr);
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__fpsr &= ~__excepts;
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__wfs(__fpsr);
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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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fexcept_t __fpsr;
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__rfs(&__fpsr);
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*__flagp = __fpsr & __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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fexcept_t __fpsr;
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__rfs(&__fpsr);
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__fpsr &= ~__excepts;
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__fpsr |= *__flagp & __excepts;
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__wfs(__fpsr);
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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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fexcept_t __ex = __excepts;
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fesetexceptflag(&__ex, __excepts); /* XXX */
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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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fexcept_t __fpsr;
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__rfs(&__fpsr);
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return (__fpsr & __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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/*
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* Apparently, the rounding mode is specified as part of the
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* instruction format on ARM, so the dynamic rounding mode is
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* indeterminate. Some FPUs may differ.
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*/
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return (-1);
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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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return (-1);
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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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__rfs(__envp);
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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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__rfs(&__env);
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*__envp = __env;
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__env &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
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__wfs(__env);
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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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__wfs(*__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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fexcept_t __fpsr;
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__rfs(&__fpsr);
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__wfs(*__envp);
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feraiseexcept(__fpsr & FE_ALL_EXCEPT);
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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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static inline int
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feenableexcept(int __mask)
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{
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fenv_t __old_fpsr, __new_fpsr;
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__rfs(&__old_fpsr);
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__new_fpsr = __old_fpsr | (__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT;
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__wfs(__new_fpsr);
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return ((__old_fpsr >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
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}
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static inline int
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fedisableexcept(int __mask)
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{
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fenv_t __old_fpsr, __new_fpsr;
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__rfs(&__old_fpsr);
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__new_fpsr = __old_fpsr & ~((__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
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__wfs(__new_fpsr);
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return ((__old_fpsr >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
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}
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static inline int
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fegetexcept(void)
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{
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fenv_t __fpsr;
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__rfs(&__fpsr);
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return ((__fpsr & _ENABLE_MASK) >> _FPUSW_SHIFT);
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}
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#endif /* __BSD_VISIBLE */
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__END_DECLS
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#endif /* !_FENV_H_ */
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