//  ============================================================
//
//  digit.h
//
//  Copyright 2002, Dennis Meilicke and Rene Peralta
//
//  ============================================================
//
//  Description:
//
//  Declaration of the digit and double digit types, and 
//  functions to deal with them.
//
//  ============================================================
#ifndef __ln3_digit__
#define __ln3_digit__


//  ----------------------------------------------------------------------
//  Change the following as appropriate.  You can use the endian.cc
//  program in the 'util' directory to determine the byte ordering
//  of your machine.
//  ----------------------------------------------------------------------
// #define __BIG_ENDIAN__
#define __LITTLE_ENDIAN__


//
//  AIX specific:  include for typedef of size_t
//
#include <stddef.h>

//  ============================================================
//
//  This header defines the "digit" and "double digit" types.
//  It may have to be modified for various architectures.  In
//  particular, the syntax for declaring 64-bit integers varies
//  from compiler to compiler.  Also, the definition of the 
//  _ddSplit structure will have to be changed when moved to
//  a machine with a different "endian" architecture.
//

#ifdef _AIX
typedef unsigned long        digit_t;
typedef          long       sdigit_t;
typedef unsigned __int64    ddigit_t;
typedef          __int64   sddigit_t;
#else
typedef unsigned long        digit_t;
typedef          long       sdigit_t;
typedef unsigned long long  ddigit_t;
typedef          long long sddigit_t;
#endif


static const size_t digitSizeInBits = 32;

#define maxDigitsBase10 (digitSizeInBits*100*LN3_DIGIT_ARRAY_SIZE)/333
// log base 2 of 10 is about 3.3219280948


typedef union _ddSplit
{
    struct
    {
#ifdef __BIG_ENDIAN__
        digit_t high;
        digit_t low;
#else
        digit_t low;
        digit_t high;
#endif
    } dd;

    ddigit_t all;

} ddSplit, ddSplit_t;


typedef union _sddSplit
{
    struct
    {
#ifdef __BIG_ENDIAN__
        digit_t high;
        digit_t low;
#else
        digit_t low;
        digit_t high;
#endif
    } dd;

    sddigit_t all;

} sddSplit, sddSplit_t;


#endif