libdecnumber/decDouble.h

/* decDouble module header for the decNumber C Library.
   Copyright (C) 2007-2026 Free Software Foundation, Inc.
   Contributed by IBM Corporation.  Author Mike Cowlishaw.

   This file is part of GCC.

   GCC is free software; you can redistribute it and/or modify it under
   the terms of the GNU General Public License as published by the Free
   Software Foundation; either version 3, or (at your option) any later
   version.

   GCC is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   for more details.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

/* ------------------------------------------------------------------ */
/* decDouble.h -- Decimal 64-bit format module header		      */
/* ------------------------------------------------------------------ */

#if !defined(DECDOUBLE)
  #define DECDOUBLE

  #define DECDOUBLENAME       "decimalDouble"	      /* Short name   */
  #define DECDOUBLETITLE      "Decimal 64-bit datum"  /* Verbose name */
  #define DECDOUBLEAUTHOR     "Mike Cowlishaw"	      /* Who to blame */

  /* parameters for decDoubles */
  #define DECDOUBLE_Bytes   8	   /* length			      */
  #define DECDOUBLE_Pmax    16	   /* maximum precision (digits)      */
  #define DECDOUBLE_Emin   -383    /* minimum adjusted exponent       */
  #define DECDOUBLE_Emax    384    /* maximum adjusted exponent       */
  #define DECDOUBLE_EmaxD   3	   /* maximum exponent digits	      */
  #define DECDOUBLE_Bias    398    /* bias for the exponent	      */
  #define DECDOUBLE_String  25	   /* maximum string length, +1       */
  #define DECDOUBLE_EconL   8	   /* exponent continuation length    */
  #define DECDOUBLE_Declets 5	   /* count of declets		      */
  /* highest biased exponent (Elimit-1) */
  #define DECDOUBLE_Ehigh (DECDOUBLE_Emax + DECDOUBLE_Bias - (DECDOUBLE_Pmax-1))

  /* Required includes						      */
  #include "decContext.h"
  #include "decQuad.h"

  /* The decDouble decimal 64-bit type, accessible by all sizes */
  typedef union {
    uint8_t   bytes[DECDOUBLE_Bytes];	/* fields: 1, 5, 8, 50 bits */
    uint16_t shorts[DECDOUBLE_Bytes/2];
    uint32_t  words[DECDOUBLE_Bytes/4];
    #if DECUSE64
    uint64_t  longs[DECDOUBLE_Bytes/8];
    #endif
    } decDouble;

  /* ---------------------------------------------------------------- */
  /* Routines -- implemented as decFloat routines in common files     */
  /* ---------------------------------------------------------------- */

  #include "decDoubleSymbols.h"

  /* Utilities and conversions, extractors, etc.) */
  extern decDouble * decDoubleFromBCD(decDouble *, int32_t, const uint8_t *, int32_t);
  extern decDouble * decDoubleFromInt32(decDouble *, int32_t);
  extern decDouble * decDoubleFromPacked(decDouble *, int32_t, const uint8_t *);
  extern decDouble * decDoubleFromPackedChecked(decDouble *, int32_t, const uint8_t *);
  extern decDouble * decDoubleFromString(decDouble *, const char *, decContext *);
  extern decDouble * decDoubleFromUInt32(decDouble *, uint32_t);
  extern decDouble * decDoubleFromWider(decDouble *, const decQuad *, decContext *);
  extern int32_t     decDoubleGetCoefficient(const decDouble *, uint8_t *);
  extern int32_t     decDoubleGetExponent(const decDouble *);
  extern decDouble * decDoubleSetCoefficient(decDouble *, const uint8_t *, int32_t);
  extern decDouble * decDoubleSetExponent(decDouble *, decContext *, int32_t);
  extern void	     decDoubleShow(const decDouble *, const char *);
  extern int32_t     decDoubleToBCD(const decDouble *, int32_t *, uint8_t *);
  extern char	   * decDoubleToEngString(const decDouble *, char *);
  extern int32_t     decDoubleToInt32(const decDouble *, decContext *, enum rounding);
  extern int32_t     decDoubleToInt32Exact(const decDouble *, decContext *, enum rounding);
  extern int32_t     decDoubleToPacked(const decDouble *, int32_t *, uint8_t *);
  extern char	   * decDoubleToString(const decDouble *, char *);
  extern uint32_t    decDoubleToUInt32(const decDouble *, decContext *, enum rounding);
  extern uint32_t    decDoubleToUInt32Exact(const decDouble *, decContext *, enum rounding);
  extern decQuad   * decDoubleToWider(const decDouble *, decQuad *);
  extern decDouble * decDoubleZero(decDouble *);

  /* Computational (result is a decDouble) */
  extern decDouble * decDoubleAbs(decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleAdd(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleAnd(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleDivide(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleDivideInteger(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleFMA(decDouble *, const decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleInvert(decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleLogB(decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleMax(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleMaxMag(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleMin(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleMinMag(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleMinus(decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleMultiply(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleNextMinus(decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleNextPlus(decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleNextToward(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleOr(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoublePlus(decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleQuantize(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleReduce(decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleRemainder(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleRemainderNear(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleRotate(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleScaleB(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleShift(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleSubtract(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleToIntegralValue(decDouble *, const decDouble *, decContext *, enum rounding);
  extern decDouble * decDoubleToIntegralExact(decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleXor(decDouble *, const decDouble *, const decDouble *, decContext *);

  /* Comparisons */
  extern decDouble * decDoubleCompare(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleCompareSignal(decDouble *, const decDouble *, const decDouble *, decContext *);
  extern decDouble * decDoubleCompareTotal(decDouble *, const decDouble *, const decDouble *);
  extern decDouble * decDoubleCompareTotalMag(decDouble *, const decDouble *, const decDouble *);

  /* Copies */
  extern decDouble * decDoubleCanonical(decDouble *, const decDouble *);
  extern decDouble * decDoubleCopy(decDouble *, const decDouble *);
  extern decDouble * decDoubleCopyAbs(decDouble *, const decDouble *);
  extern decDouble * decDoubleCopyNegate(decDouble *, const decDouble *);
  extern decDouble * decDoubleCopySign(decDouble *, const decDouble *, const decDouble *);

  /* Non-computational */
  extern enum decClass decDoubleClass(const decDouble *);
  extern const char *  decDoubleClassString(const decDouble *);
  extern uint32_t      decDoubleDigits(const decDouble *);
  extern uint32_t      decDoubleIsCanonical(const decDouble *);
  extern uint32_t      decDoubleIsFinite(const decDouble *);
  extern uint32_t      decDoubleIsInfinite(const decDouble *);
  extern uint32_t      decDoubleIsInteger(const decDouble *);
  extern uint32_t      decDoubleIsNaN(const decDouble *);
  extern uint32_t      decDoubleIsNormal(const decDouble *);
  extern uint32_t      decDoubleIsSignaling(const decDouble *);
  extern uint32_t      decDoubleIsSignalling(const decDouble *);
  extern uint32_t      decDoubleIsSigned(const decDouble *);
  extern uint32_t      decDoubleIsSubnormal(const decDouble *);
  extern uint32_t      decDoubleIsZero(const decDouble *);
  extern uint32_t      decDoubleRadix(const decDouble *);
  extern uint32_t      decDoubleSameQuantum(const decDouble *, const decDouble *);
  extern const char *  decDoubleVersion(void);

  /* decNumber conversions; these are implemented as macros so as not  */
  /* to force a dependency on decimal64 and decNumber in decDouble.    */
  /* decDoubleFromNumber returns a decimal64 * to avoid warnings.      */
  #define decDoubleToNumber(dq, dn) decimal64ToNumber((decimal64 *)(dq), dn)
  #define decDoubleFromNumber(dq, dn, set) decimal64FromNumber((decimal64 *)(dq), dn, set)

#endif