| /*- |
| * Copyright (c) 2004-2005 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: src/lib/msun/alpha/fenv.h,v 1.3 2005/03/16 19:03:44 das Exp $ |
| */ |
| |
| #ifndef _FENV_H_ |
| #define _FENV_H_ |
| |
| #include <sys/_types.h> |
| |
| typedef __uint64_t fenv_t; |
| typedef __uint16_t fexcept_t; |
| |
| /* Exception flags */ |
| #define FE_INVALID 0x02 |
| #define FE_DIVBYZERO 0x04 |
| #define FE_OVERFLOW 0x08 |
| #define FE_UNDERFLOW 0x10 |
| #define FE_INEXACT 0x20 |
| #define FE_INTOVF 0x40 /* not maskable */ |
| #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | FE_INTOVF | \ |
| FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW) |
| |
| /* Rounding modes */ |
| #define FE_TOWARDZERO 0x00 |
| #define FE_DOWNWARD 0x01 |
| #define FE_TONEAREST 0x02 |
| #define FE_UPWARD 0x03 |
| #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \ |
| FE_UPWARD | FE_TOWARDZERO) |
| #define _ROUND_SHIFT 58 |
| |
| #define _FPUSW_SHIFT 51 |
| |
| #define __excb() __asm __volatile("excb") |
| #define __mf_fpcr(__cw) __asm __volatile("mf_fpcr %0" : "=f" (*(__cw))) |
| #define __mt_fpcr(__cw) __asm __volatile("mt_fpcr %0" : : "f" (__cw)) |
| |
| union __fpcr { |
| double __d; |
| fenv_t __bits; |
| }; |
| |
| __BEGIN_DECLS |
| |
| /* Default floating-point environment */ |
| extern const fenv_t __fe_dfl_env; |
| #define FE_DFL_ENV (&__fe_dfl_env) |
| |
| static __inline int |
| feclearexcept(int __excepts) |
| { |
| union __fpcr __r; |
| |
| __excb(); |
| __mf_fpcr(&__r.__d); |
| __r.__bits &= ~((fenv_t)__excepts << _FPUSW_SHIFT); |
| __mt_fpcr(__r.__d); |
| __excb(); |
| return (0); |
| } |
| |
| static __inline int |
| fegetexceptflag(fexcept_t *__flagp, int __excepts) |
| { |
| union __fpcr __r; |
| |
| __excb(); |
| __mf_fpcr(&__r.__d); |
| __excb(); |
| *__flagp = (__r.__bits >> _FPUSW_SHIFT) & __excepts; |
| return (0); |
| } |
| |
| static __inline int |
| fesetexceptflag(const fexcept_t *__flagp, int __excepts) |
| { |
| union __fpcr __r; |
| fenv_t __xflag, __xexcepts; |
| |
| __xflag = (fenv_t)*__flagp << _FPUSW_SHIFT; |
| __xexcepts = (fenv_t)__excepts << _FPUSW_SHIFT; |
| __excb(); |
| __mf_fpcr(&__r.__d); |
| __r.__bits &= ~__xexcepts; |
| __r.__bits |= __xflag & __xexcepts; |
| __mt_fpcr(__r.__d); |
| __excb(); |
| return (0); |
| } |
| |
| static __inline int |
| feraiseexcept(int __excepts) |
| { |
| |
| /* |
| * XXX Generating exceptions this way does not actually invoke |
| * a userland trap handler when enabled, but neither do |
| * arithmetic operations as far as I can tell. Perhaps there |
| * are more bugs in the kernel trap handler. |
| */ |
| fexcept_t __ex = __excepts; |
| fesetexceptflag(&__ex, __excepts); |
| return (0); |
| } |
| |
| static __inline int |
| fetestexcept(int __excepts) |
| { |
| union __fpcr __r; |
| |
| __excb(); |
| __mf_fpcr(&__r.__d); |
| __excb(); |
| return ((__r.__bits >> _FPUSW_SHIFT) & __excepts); |
| } |
| |
| static __inline int |
| fegetround(void) |
| { |
| union __fpcr __r; |
| |
| /* |
| * No exception barriers should be required here if we assume |
| * that only fesetround() can change the rounding mode. |
| */ |
| __mf_fpcr(&__r.__d); |
| return ((int)(__r.__bits >> _ROUND_SHIFT) & _ROUND_MASK); |
| } |
| |
| static __inline int |
| fesetround(int __round) |
| { |
| union __fpcr __r; |
| |
| if (__round & ~_ROUND_MASK) |
| return (-1); |
| __excb(); |
| __mf_fpcr(&__r.__d); |
| __r.__bits &= ~((fenv_t)_ROUND_MASK << _ROUND_SHIFT); |
| __r.__bits |= (fenv_t)__round << _ROUND_SHIFT; |
| __mt_fpcr(__r.__d); |
| __excb(); |
| return (0); |
| } |
| |
| int fegetenv(fenv_t *__envp); |
| int feholdexcept(fenv_t *__envp); |
| int fesetenv(const fenv_t *__envp); |
| int feupdateenv(const fenv_t *__envp); |
| |
| #if __BSD_VISIBLE |
| |
| int feenableexcept(int __mask); |
| int fedisableexcept(int __mask); |
| int fegetexcept(void); |
| |
| #endif /* __BSD_VISIBLE */ |
| |
| __END_DECLS |
| |
| #endif /* !_FENV_H_ */ |