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phoenix |
/*******************************************************************************
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* *
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* File fp_private.h, *
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* All pack 4 dependencies for the MathLib elems plus some defines used *
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* throughout MathLib. *
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* *
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* Copyright © 1991 Apple Computer, Inc. All rights reserved. *
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* *
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* Written by Ali Sazegari, started on October 1991, *
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* *
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* W A R N I N G: This routine expects a 64 bit double model. *
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* *
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*******************************************************************************/
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#define NoException 0
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/*******************************************************************************
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* Values of constants. *
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*******************************************************************************/
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//#define SgnMask 0x8000
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#define dSgnMask 0x80000000
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#define sSgnMask 0x7FFFFFFF
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//#define ExpMask 0x7FFF
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#define dExpMask 0x7FF00000
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#define sExpMask 0xFF000000
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/* according to rounding BIG & SMALL are: */
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#define BIG 1.1e+300 /* used to deliver ±° or largest number, */
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#define SMALL 1.1e-300 /* used to deliver ±0 or smallest number. */
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#define InfExp 0x7FF
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#define dMaxExp 0x7FF00000
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#define MaxExpP1 1024
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#define MaxExp 1023
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#define DenormLimit -52
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//#define ManMask 0x80000000
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#define dManMask 0x00080000
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//#define IsItDenorm 0x80000000
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#define dIsItDenorm 0x00080000
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//#define xIsItSNaN 0x40000000
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#define dIsItSNaN 0x00080000
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#define dHighMan 0x000FFFFF
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#define dFirstBitSet 0x00080000
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#define BIAS 0x3FF
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//#define GetSign 0x8000
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#define dGetSign 0x80000000
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#define sGetSign 0x80000000
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//#define Infinity(x) ( x.hex.exponent & ExpMask ) == ExpMask
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#define dInfinity(x) ( x.hex.high & dExpMask ) == dExpMask
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#define sInfinity(x) ( ( x.hexsgl << 1 ) & sExpMask ) == sExpMask
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//#define Exponent(x) x.hex.exponent & ExpMask
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#define dExponent(x) x.hex.high & dExpMask
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#define sExponent(x) ( ( x.hexsgl << 1 ) & sExpMask )
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#define sZero(x) ( x.hexsgl & sSgnMask ) == 0
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//#define Sign(x) ( x.hex.exponent & SgnMask ) == SgnMask
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/*******************************************************************************
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* Types used in the auxiliary functions. *
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*******************************************************************************/
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#include <stdint.h>
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typedef struct /* Hex representation of a double. */
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{
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#if defined(__BIG_ENDIAN__)
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uint32_t high;
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uint32_t low;
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#else
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uint32_t low;
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uint32_t high;
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#endif
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} dHexParts;
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typedef union
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{
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unsigned char byties[8];
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double dbl;
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} DblInHex;
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