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146 lines
4.2 KiB
146 lines
4.2 KiB
/**
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@file
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@ingroup epd
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@brief Internal header for the University of Colorado extended
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double precision package.
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@author In-Ho Moon
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@copyright@parblock
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Copyright (c) 1995-2015, Regents of the University of Colorado
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All rights reserved.
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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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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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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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Neither the name of the University of Colorado nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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@endparblock
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*/
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#ifndef EPD_INT_H_
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#define EPD_INT_H_
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#include "config.h"
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#include "epd.h"
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#if WORDS_BIGENDIAN == 1
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#define EPD_BIG_ENDIAN
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#endif
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/*---------------------------------------------------------------------------*/
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/* Constant declarations */
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/*---------------------------------------------------------------------------*/
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#define EPD_MAX_BIN 1023
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#define EPD_MAX_DEC 308
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#define EPD_EXP_INF 0x7ff
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/*---------------------------------------------------------------------------*/
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/* Type declarations */
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/*---------------------------------------------------------------------------*/
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typedef struct IeeeDoubleStruct IeeeDouble;
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typedef struct IeeeNanStruct IeeeNan;
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typedef union EpTypeUnion EpType;
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/*---------------------------------------------------------------------------*/
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/* Structure declarations */
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/*---------------------------------------------------------------------------*/
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/**
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@brief IEEE double struct.
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*/
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#ifdef EPD_BIG_ENDIAN
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struct IeeeDoubleStruct { /* BIG_ENDIAN */
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unsigned int sign: 1;
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unsigned int exponent: 11;
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unsigned int mantissa0: 20;
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unsigned int mantissa1: 32;
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};
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#else
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struct IeeeDoubleStruct { /* LITTLE_ENDIAN */
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unsigned int mantissa1: 32;
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unsigned int mantissa0: 20;
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unsigned int exponent: 11;
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unsigned int sign: 1;
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};
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#endif
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/**
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@brief IEEE double NaN struct.
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*/
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#ifdef EPD_BIG_ENDIAN
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struct IeeeNanStruct { /* BIG_ENDIAN */
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unsigned int sign: 1;
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unsigned int exponent: 11;
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unsigned int quiet_bit: 1;
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unsigned int mantissa0: 19;
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unsigned int mantissa1: 32;
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};
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#else
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struct IeeeNanStruct { /* LITTLE_ENDIAN */
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unsigned int mantissa1: 32;
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unsigned int mantissa0: 19;
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unsigned int quiet_bit: 1;
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unsigned int exponent: 11;
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unsigned int sign: 1;
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};
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#endif
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/**
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@brief Different views of a double.
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*/
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union EpTypeUnion {
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double value;
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struct IeeeDoubleStruct bits;
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struct IeeeNanStruct nan;
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};
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/**
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@brief Extended precision double to keep very large value.
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*/
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struct EpDoubleStruct {
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union EpTypeUnion type;
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int exponent;
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};
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/*---------------------------------------------------------------------------*/
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/* Function prototypes */
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/*---------------------------------------------------------------------------*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* EPD_H_ */
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