fenv.h revision c90e13620d230b7e730878150ad468aac188ba0c
/** @file
* innotek Portable Runtime / No-CRT - fenv.h, X86.
*/
/*
* Copyright (C) 2006-2007 innotek GmbH
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* General Public License as published by the Free Software Foundation,
* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
* distribution. VirtualBox OSE is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY of any kind.
*
* If you received this file as part of a commercial VirtualBox
* distribution, then only the terms of your commercial VirtualBox
* license agreement apply instead of the previous paragraph.
*
* --------------------------------------------------------------------
*
* This code is based on:
*
* 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
*
* 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.
*
*/
#ifndef ___iprt_nocrt_x86_fenv_h
#define ___iprt_nocrt_x86_fenv_h
/*
* To preserve binary compatibility with FreeBSD 5.3, we pack the
* mxcsr into some reserved fields, rather than changing sizeof(fenv_t).
*/
typedef struct {
char __other[16];
} fenv_t;
((env).__mxcsr_lo))
#define __set_mxcsr(env, x) do { \
} while (0)
/* 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
/* Rounding modes */
#define FE_TONEAREST 0x0000
#define FE_DOWNWARD 0x0400
#define FE_UPWARD 0x0800
#define FE_TOWARDZERO 0x0c00
/*
* As compared to the x87 control word, the SSE unit's control word
* has the rounding control bits offset by 3 and the exception mask
* bits offset by 7.
*/
#define _SSE_ROUND_SHIFT 3
#define _SSE_EMASK_SHIFT 7
/* After testing for SSE support once, we cache the result in __has_sse. */
int RT_NOCRT(__test_sse)(void);
#ifdef __SSE__
#define __HAS_SSE() 1
#else
#endif
/* Default floating-point environment */
extern const fenv_t __fe_dfl_env;
#define FE_DFL_ENV (&__fe_dfl_env)
DECLINLINE(int)
feclearexcept(int __excepts)
{
int __mxcsr;
if (__excepts == FE_ALL_EXCEPT) {
__fnclex();
} else {
}
if (__HAS_SSE()) {
}
return (0);
}
DECLINLINE(int)
{
if (__HAS_SSE())
else
__mxcsr = 0;
return (0);
}
DECLINLINE(int)
fetestexcept(int __excepts)
{
if (__HAS_SSE())
else
__mxcsr = 0;
}
DECLINLINE(int)
fegetround(void)
{
int __control;
/*
* We assume that the x87 and the SSE unit agree on the
* rounding mode. Reading the control word on the x87 turns
* out to be about 5 times faster than reading it on the SSE
* unit on an Opteron 244.
*/
return (__control & _ROUND_MASK);
}
DECLINLINE(int)
fesetround(int __round)
{
if (__round & ~_ROUND_MASK)
return (-1);
__control &= ~_ROUND_MASK;
if (__HAS_SSE()) {
}
return (0);
}
DECLINLINE(int)
{
int __mxcsr;
if (__HAS_SSE())
return (0);
}
DECLINLINE(int)
fegetexcept(void)
{
int __control;
/*
* We assume that the masks for the x87 and the SSE unit are
* the same.
*/
return (~__control & FE_ALL_EXCEPT);
}
#ifndef RT_WIHTOUT_NOCRT_WRAPPERS
#endif
#endif /* !__iprt_nocrt_x86_fenv_h__ */