86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
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/* $NetBSD: fenv.h,v 1.2 2017/01/14 12:00:13 martin Exp $ */
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/*-
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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 _SYS_FENV_H_
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#define _SYS_FENV_H_
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#include <stdint.h>
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#ifdef __arch64__
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typedef uint64_t fenv_t;
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typedef uint64_t fexcept_t;
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#else
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typedef uint32_t fenv_t;
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typedef uint32_t fexcept_t;
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#endif
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/*
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* Exception flags
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*
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* Symbols are defined in such a way, to correspond to the accrued
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* exception bits (aexc) fields of FSR.
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*/
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#define FE_INEXACT 0x00000020 /* 0000100000 */
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#define FE_DIVBYZERO 0x00000040 /* 0001000000 */
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#define FE_UNDERFLOW 0x00000080 /* 0010000000 */
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#define FE_OVERFLOW 0x00000100 /* 0100000000 */
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#define FE_INVALID 0x00000200 /* 1000000000 */
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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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/*
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* Rounding modes
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*
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* We can't just use the hardware bit values here, because that would
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* make FE_UPWARD and FE_DOWNWARD negative, which is not allowed.
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*/
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#define FE_TONEAREST 0 /* round to nearest representable number */
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#define FE_TOWARDZERO 1 /* round to zero (truncate) */
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#define FE_UPWARD 2 /* round toward positive infinity */
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#define FE_DOWNWARD 3 /* round toward negative infinity */
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#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
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FE_UPWARD | FE_TOWARDZERO)
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#define _ROUND_SHIFT 30
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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 18
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#define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT)
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#endif /* !_SYS_FENV_H_ */
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