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201 lines
11 KiB
C
201 lines
11 KiB
C
/* Decimal number arithmetic module header for the decNumber C Library.
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Copyright (C) 2005, 2007 Free Software Foundation, Inc.
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Contributed by IBM Corporation. Author Mike Cowlishaw.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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In addition to the permissions in the GNU General Public License,
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the Free Software Foundation gives you unlimited permission to link
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the compiled version of this file into combinations with other
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programs, and to distribute those combinations without any
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restriction coming from the use of this file. (The General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into a combine executable.)
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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/* ------------------------------------------------------------------ */
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/* Decimal Number arithmetic module header */
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/* ------------------------------------------------------------------ */
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#if !defined(DECNUMBER)
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#define DECNUMBER
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#define DECNAME "decNumber" /* Short name */
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#define DECFULLNAME "Decimal Number Module" /* Verbose name */
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#define DECAUTHOR "Mike Cowlishaw" /* Who to blame */
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#if !defined(DECCONTEXT)
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#include "decContext.h"
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#endif
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/* Bit settings for decNumber.bits */
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#define DECNEG 0x80 /* Sign; 1=negative, 0=positive or zero */
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#define DECINF 0x40 /* 1=Infinity */
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#define DECNAN 0x20 /* 1=NaN */
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#define DECSNAN 0x10 /* 1=sNaN */
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/* The remaining bits are reserved; they must be 0 */
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#define DECSPECIAL (DECINF|DECNAN|DECSNAN) /* any special value */
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/* Define the decNumber data structure. The size and shape of the */
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/* units array in the structure is determined by the following */
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/* constant. This must not be changed without recompiling the */
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/* decNumber library modules. */
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#define DECDPUN 3 /* DECimal Digits Per UNit [must be >0 */
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/* and <10; 3 or powers of 2 are best]. */
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/* DECNUMDIGITS is the default number of digits that can be held in */
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/* the structure. If undefined, 1 is assumed and it is assumed */
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/* that the structure will be immediately followed by extra space, */
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/* as required. DECNUMDIGITS is always >0. */
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#if !defined(DECNUMDIGITS)
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#define DECNUMDIGITS 1
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#endif
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/* The size (integer data type) of each unit is determined by the */
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/* number of digits it will hold. */
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#if DECDPUN<=2
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#define decNumberUnit uint8_t
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#elif DECDPUN<=4
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#define decNumberUnit uint16_t
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#else
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#define decNumberUnit uint32_t
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#endif
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/* The number of units needed is ceil(DECNUMDIGITS/DECDPUN) */
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#define DECNUMUNITS ((DECNUMDIGITS+DECDPUN-1)/DECDPUN)
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/* The data structure... */
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typedef struct {
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int32_t digits; /* Count of digits in the coefficient; >0 */
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int32_t exponent; /* Unadjusted exponent, unbiased, in */
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/* range: -1999999997 through 999999999 */
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uint8_t bits; /* Indicator bits (see above) */
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/* Coefficient, from least significant unit */
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decNumberUnit lsu[DECNUMUNITS];
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} decNumber;
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/* Notes: */
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/* 1. If digits is > DECDPUN then there will one or more */
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/* decNumberUnits immediately following the first element of lsu.*/
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/* These contain the remaining (more significant) digits of the */
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/* number, and may be in the lsu array, or may be guaranteed by */
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/* some other mechanism (such as being contained in another */
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/* structure, or being overlaid on dynamically allocated */
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/* storage). */
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/* */
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/* Each integer of the coefficient (except potentially the last) */
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/* contains DECDPUN digits (e.g., a value in the range 0 through */
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/* 99999999 if DECDPUN is 8, or 0 through 999 if DECDPUN is 3). */
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/* */
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/* 2. A decNumber converted to a string may need up to digits+14 */
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/* characters. The worst cases (non-exponential and exponential */
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/* formats) are -0.00000{9...}# and -9.{9...}E+999999999# */
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/* (where # is '\0') */
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/* ---------------------------------------------------------------- */
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/* decNumber public functions and macros */
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/* ---------------------------------------------------------------- */
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#include "decNumberSymbols.h"
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/* Conversions */
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decNumber * decNumberFromInt32(decNumber *, int32_t);
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decNumber * decNumberFromUInt32(decNumber *, uint32_t);
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decNumber * decNumberFromString(decNumber *, const char *, decContext *);
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char * decNumberToString(const decNumber *, char *);
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char * decNumberToEngString(const decNumber *, char *);
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uint32_t decNumberToUInt32(const decNumber *, decContext *);
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int32_t decNumberToInt32(const decNumber *, decContext *);
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uint8_t * decNumberGetBCD(const decNumber *, uint8_t *);
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decNumber * decNumberSetBCD(decNumber *, const uint8_t *, uint32_t);
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/* Operators and elementary functions */
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decNumber * decNumberAbs(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberAdd(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberAnd(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberCompare(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberCompareSignal(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberCompareTotal(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberCompareTotalMag(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberDivide(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberDivideInteger(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberExp(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberFMA(decNumber *, const decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberInvert(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberLn(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberLogB(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberLog10(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberMax(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberMaxMag(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberMin(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberMinMag(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberMinus(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberMultiply(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberNormalize(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberOr(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberPlus(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberPower(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberQuantize(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberReduce(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberRemainder(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberRemainderNear(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberRescale(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberRotate(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberSameQuantum(decNumber *, const decNumber *, const decNumber *);
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decNumber * decNumberScaleB(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberShift(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberSquareRoot(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberSubtract(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberToIntegralExact(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberToIntegralValue(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberXor(decNumber *, const decNumber *, const decNumber *, decContext *);
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/* Utilities */
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enum decClass decNumberClass(const decNumber *, decContext *);
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const char * decNumberClassToString(enum decClass);
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decNumber * decNumberCopy(decNumber *, const decNumber *);
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decNumber * decNumberCopyAbs(decNumber *, const decNumber *);
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decNumber * decNumberCopyNegate(decNumber *, const decNumber *);
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decNumber * decNumberCopySign(decNumber *, const decNumber *, const decNumber *);
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decNumber * decNumberNextMinus(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberNextPlus(decNumber *, const decNumber *, decContext *);
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decNumber * decNumberNextToward(decNumber *, const decNumber *, const decNumber *, decContext *);
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decNumber * decNumberTrim(decNumber *);
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const char * decNumberVersion(void);
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decNumber * decNumberZero(decNumber *);
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/* Functions for testing decNumbers (normality depends on context) */
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int32_t decNumberIsNormal(const decNumber *, decContext *);
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int32_t decNumberIsSubnormal(const decNumber *, decContext *);
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/* Macros for testing decNumber *dn */
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#define decNumberIsCanonical(dn) (1) /* All decNumbers are saintly */
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#define decNumberIsFinite(dn) (((dn)->bits&DECSPECIAL)==0)
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#define decNumberIsInfinite(dn) (((dn)->bits&DECINF)!=0)
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#define decNumberIsNaN(dn) (((dn)->bits&(DECNAN|DECSNAN))!=0)
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#define decNumberIsNegative(dn) (((dn)->bits&DECNEG)!=0)
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#define decNumberIsQNaN(dn) (((dn)->bits&(DECNAN))!=0)
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#define decNumberIsSNaN(dn) (((dn)->bits&(DECSNAN))!=0)
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#define decNumberIsSpecial(dn) (((dn)->bits&DECSPECIAL)!=0)
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#define decNumberIsZero(dn) (*(dn)->lsu==0 \
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&& (dn)->digits==1 \
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&& (((dn)->bits&DECSPECIAL)==0))
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#define decNumberRadix(dn) (10)
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#endif
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