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author | das <das@FreeBSD.org> | 2004-06-06 10:04:17 +0000 |
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committer | das <das@FreeBSD.org> | 2004-06-06 10:04:17 +0000 |
commit | b1670fc3d8bdd91104d9e1be90f3b5cd145cc2aa (patch) | |
tree | 9c187310f51745d18241dc90d1a23e08d4a46781 /lib/msun/i387 | |
parent | 3994165f74f24e6d976776c1f721f7a88208448c (diff) | |
download | FreeBSD-src-b1670fc3d8bdd91104d9e1be90f3b5cd145cc2aa.zip FreeBSD-src-b1670fc3d8bdd91104d9e1be90f3b5cd145cc2aa.tar.gz |
Add an fenv.h implementation for the i386 port.
Reviewed by: standards@
Diffstat (limited to 'lib/msun/i387')
-rw-r--r-- | lib/msun/i387/fenv.c | 39 | ||||
-rw-r--r-- | lib/msun/i387/fenv.h | 224 |
2 files changed, 263 insertions, 0 deletions
diff --git a/lib/msun/i387/fenv.c b/lib/msun/i387/fenv.c new file mode 100644 index 0000000..54197f5 --- /dev/null +++ b/lib/msun/i387/fenv.c @@ -0,0 +1,39 @@ +/*- + * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#include <sys/types.h> +#include <machine/npx.h> +#include <fenv.h> + +const fenv_t __fe_dfl_env = { + 0xffff0000 | __INITIAL_NPXCW__, + 0xffff0000, + 0xffffffff, + { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff } +}; diff --git a/lib/msun/i387/fenv.h b/lib/msun/i387/fenv.h new file mode 100644 index 0000000..6989c05 --- /dev/null +++ b/lib/msun/i387/fenv.h @@ -0,0 +1,224 @@ +/*- + * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#ifndef _FENV_H_ +#define _FENV_H_ + +#include <sys/cdefs.h> +#include <sys/_types.h> + +typedef struct { + __uint32_t __control; + __uint32_t __status; + __uint32_t __tag; + char __other[16]; +} fenv_t; + +typedef __uint16_t fexcept_t; + +/* Exception flags */ +#define FE_INVALID 0x01 +#define FE_DENORMAL 0x02 +#define FE_DIVBYZERO 0x04 +#define FE_OVERFLOW 0x08 +#define FE_UNDERFLOW 0x10 +#define FE_INEXACT 0x20 +#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_DENORMAL | FE_INEXACT | \ + FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW) + +/* Rounding modes */ +#define FE_TONEAREST 0x0000 +#define FE_DOWNWARD 0x0400 +#define FE_UPWARD 0x0800 +#define FE_TOWARDZERO 0x0c00 +#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \ + FE_UPWARD | FE_TOWARDZERO) + +__BEGIN_DECLS + +/* Default floating-point environment */ +extern const fenv_t __fe_dfl_env; +#define FE_DFL_ENV (&__fe_dfl_env) + +#define __fldcw(__cw) __asm __volatile("fldcw %0" : : "m" (__cw)) +#define __fldenv(__env) __asm __volatile("fldenv %0" : : "m" (__env)) +#define __fnclex() __asm __volatile("fnclex") +#define __fnstenv(__env) __asm("fnstenv %0" : "=m" (*(__env))) +#define __fnstcw(__cw) __asm("fnstcw %0" : "=m" (*(__cw))) +#define __fnstsw(__sw) __asm("fnstsw %0" : "=am" (*(__sw))) +#define __fwait() __asm __volatile("fwait") + +static __inline int +feclearexcept(int __excepts) +{ + fenv_t __env; + + if (__excepts == FE_ALL_EXCEPT) { + __fnclex(); + } else { + __fnstenv(&__env); + __env.__status &= ~__excepts; + __fldenv(__env); + } + return (0); +} + +static __inline int +fegetexceptflag(fexcept_t *__flagp, int __excepts) +{ + int __status; + + __fnstsw(&__status); + *__flagp = __status & __excepts; + return (0); +} + +static __inline int +fesetexceptflag(const fexcept_t *__flagp, int __excepts) +{ + fenv_t __env; + + __fnstenv(&__env); + __env.__status &= ~__excepts; + __env.__status |= *__flagp & __excepts; + __fldenv(__env); + return (0); +} + +static __inline int +feraiseexcept(int __excepts) +{ + fexcept_t __ex = __excepts; + + fesetexceptflag(&__ex, __excepts); + __fwait(); + return (0); +} + +static __inline int +fetestexcept(int __excepts) +{ + int __status; + + __fnstsw(&__status); + return (__status & __excepts); +} + +static __inline int +fegetround(void) +{ + int __control; + + __fnstcw(&__control); + return (__control & _ROUND_MASK); +} + +static __inline int +fesetround(int __round) +{ + int __control; + + if (__round & ~_ROUND_MASK) + return (-1); + __fnstcw(&__control); + __control &= ~_ROUND_MASK; + __control |= __round; + __fldcw(__control); + return (0); +} + +static __inline int +fegetenv(fenv_t *__envp) +{ + int __control; + + /* + * fnstenv masks all exceptions, so we need to save and + * restore the control word to avoid this side effect. + */ + __fnstcw(&__control); + __fnstenv(__envp); + __fldcw(__control); + return (0); +} + +static __inline int +feholdexcept(fenv_t *__envp) +{ + + __fnstenv(__envp); + __fnclex(); + return (0); +} + +static __inline int +fesetenv(const fenv_t *__envp) +{ + + __fldenv(*__envp); + return (0); +} + +static __inline int +feupdateenv(const fenv_t *__envp) +{ + int __status; + + __fnstsw(&__status); + __fldenv(*__envp); + feraiseexcept(__status & FE_ALL_EXCEPT); + return (0); +} + +#if __BSD_VISIBLE + +static __inline int +fesetmask(int __mask) +{ + int __control; + + __fnstcw(&__control); + __mask = (__control | FE_ALL_EXCEPT) & ~__mask; + __fldcw(__mask); + return (~__control & FE_ALL_EXCEPT); +} + +static __inline int +fegetmask(void) +{ + int __control; + + __fnstcw(&__control); + return (~__control & FE_ALL_EXCEPT); +} + +#endif /* __BSD_VISIBLE */ + +__END_DECLS + +#endif /* !_FENV_H_ */ |