C:/systemc-2.2.0/systemc-2.2.0/src/sysc/datatypes/int/sc_nbdefs.h

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  set forth in the SystemC Open Source License Version 2.4 (the "License");
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  ANY KIND, either express or implied. See the License for the specific
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 *****************************************************************************/

/*****************************************************************************

  sc_nbdefs.h -- Top level header file for arbitrary precision signed/unsigned
                 arithmetic. This file defines all the constants needed.

  Original Author: Ali Dasdan, Synopsys, Inc.
  
 *****************************************************************************/

/*****************************************************************************

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.

      Name, Affiliation, Date:
  Description of Modification:

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// $Log: sc_nbdefs.h,v $
// Revision 1.1.1.1  2006/12/15 20:31:36  acg
// SystemC 2.2
//
// Revision 1.3  2006/01/13 18:49:32  acg
// Added $Log command so that CVS check in comments are reproduced in the
// source.
//

#ifndef SC_NBDEFS_H
#define SC_NBDEFS_H


#include "sysc/kernel/sc_cmnhdr.h"

#include <climits>

#include "sysc/utils/sc_iostream.h"
#include "sysc/kernel/sc_constants.h"   // For SC_MAX_NBITS
#include "sysc/utils/sc_string.h"      // For sc_numrep


#if defined( __SUNPRO_CC ) || defined( _MSC_VER ) || 1
#define SC_DT_MIXED_COMMA_OPERATORS
#endif


namespace sc_dt
{

// Sign of a number:
#define SC_NEG       -1     // Negative number
#define SC_ZERO      0      // Zero
#define SC_POS       1      // Positive number
#define SC_NOSIGN    2      // Uninitialized sc_signed number

typedef unsigned char uchar;

// A small_type number is at least a char. Defining an int is probably
// better for alignment.
typedef int small_type;

// Attributes of a byte.
#define BITS_PER_BYTE   8
#define BYTE_RADIX      256
#define BYTE_MASK       255

// LOG2_BITS_PER_BYTE = log2(BITS_PER_BYTE), assuming that
// BITS_PER_BYTE is a power of 2.
#define LOG2_BITS_PER_BYTE 3

// Attributes of the unsigned long. These definitions are used mainly in
// the functions that are aware of the internal representation of
// digits, e.g., get/set_packed_rep().
#define BYTES_PER_DIGIT_TYPE  4
#define BITS_PER_DIGIT_TYPE   32

// Attributes of a digit, i.e., unsigned long less the overflow bits.
#define BYTES_PER_DIGIT 4
#define BITS_PER_DIGIT  30
#define DIGIT_RADIX     (1ul << BITS_PER_DIGIT)
#define DIGIT_MASK      (DIGIT_RADIX - 1)
// Make sure that BYTES_PER_DIGIT = ceil(BITS_PER_DIGIT / BITS_PER_BYTE).

// Similar attributes for the half of a digit. Note that
// HALF_DIGIT_RADIX is equal to the square root of DIGIT_RADIX. These
// definitions are used mainly in the multiplication routines.
#define BITS_PER_HALF_DIGIT (BITS_PER_DIGIT / 2)
#define HALF_DIGIT_RADIX    (1ul << BITS_PER_HALF_DIGIT)
#define HALF_DIGIT_MASK     (HALF_DIGIT_RADIX - 1)

// DIV_CEIL2(x, y) = ceil(x / y). x and y are positive numbers.
#define DIV_CEIL2(x, y) (((x) - 1) / (y) + 1)

// DIV_CEIL(x) = ceil(x / BITS_PER_DIGIT) = the number of digits to
// store x bits. x is a positive number.
#define DIV_CEIL(x) DIV_CEIL2(x, BITS_PER_DIGIT)

#ifdef SC_MAX_NBITS
extern const int MAX_NDIGITS;
// Consider a number with x bits another with y bits. The maximum
// number of bits happens when we multiply them. The result will have
// (x + y) bits. Assume that x + y <= SC_MAX_NBITS. Then, DIV_CEIL(x) +
// DIV_CEIL(y) <= DIV_CEIL(SC_MAX_NBITS) + 2. This is the reason for +2
// above. With this change, MAX_NDIGITS must be enough to hold the
// result of any operation.
#endif

// Support for "digit" vectors used to hold the values of sc_signed,
// sc_unsigned, sc_bv_base,  and sc_lv_base data types. This type is also used 
// in the concatenation support. An sc_digit is currently an unsigned 32-bit 
// quantity. The typedef used is an unsigned int, rather than an unsigned long,
// since the unsigned long data type varies in size between 32-bit and 64-bit 
// machines.

typedef unsigned int sc_digit;  // 32-bit unsigned integer

// Support for the long long type. This type is not in the standard
// but is usually supported by compilers.
#ifndef WIN32
    typedef long long          int64;
    typedef unsigned long long uint64;
    extern const uint64        UINT64_ZERO;
    extern const uint64        UINT64_ONE;
    extern const uint64        UINT64_32ONES;
#else
    typedef __int64            int64;
    typedef unsigned __int64   uint64;
    extern const uint64        UINT64_ZERO;
    extern const uint64        UINT64_ONE;
    extern const uint64        UINT64_32ONES;
#endif


// Bits per ...
// will be deleted in the future. Use numeric_limits instead
#define BITS_PER_CHAR    8
#define BITS_PER_INT    (sizeof(int) * BITS_PER_CHAR)
#define BITS_PER_LONG   (sizeof(long) * BITS_PER_CHAR)
#define BITS_PER_INT64  (sizeof(long long) * BITS_PER_CHAR)
#define BITS_PER_UINT   (sizeof(unsigned int) * BITS_PER_CHAR)
#define BITS_PER_ULONG  (sizeof(unsigned long) * BITS_PER_CHAR)
#define BITS_PER_UINT64 (sizeof(unsigned long long) * BITS_PER_CHAR)

// Digits per ...
#define DIGITS_PER_CHAR   1
#define DIGITS_PER_INT    ((BITS_PER_INT+29)/30)
#define DIGITS_PER_LONG   ((BITS_PER_LONG+29)/30)
#define DIGITS_PER_INT64  ((BITS_PER_INT64+29)/30)
#define DIGITS_PER_UINT   ((BITS_PER_UINT+29)/30)
#define DIGITS_PER_ULONG  ((BITS_PER_ULONG+29)/30)
#define DIGITS_PER_UINT64 ((BITS_PER_UINT64+29)/30)

// Above, BITS_PER_X is mainly used for sc_signed, and BITS_PER_UX is
// mainly used for sc_unsigned.

#if defined( WIN32 ) || defined( __SUNPRO_CC ) || defined( __HP_aCC )
typedef unsigned long fmtflags;
#else
typedef ::std::ios::fmtflags fmtflags;
#endif

extern const small_type NB_DEFAULT_BASE ;

// For sc_int code:
#define LLWIDTH  BITS_PER_INT64
#define INTWIDTH BITS_PER_INT

#ifndef _32BIT_

typedef int64 int_type;
typedef uint64 uint_type;
#define SC_INTWIDTH 64
extern const uint64 UINT_ZERO;
extern const uint64 UINT_ONE;

#else

typedef int int_type;
typedef unsigned int uint_type;
#define SC_INTWIDTH 32
extern const unsigned int UINT_ZERO;
extern const unsigned int UINT_ONE;

#endif


#if defined(_MSC_VER) && ( _MSC_VER < 1300 )
    // VC++6 bug
    ::std::ostream& operator << ( ::std::ostream&, int64 );
    ::std::ostream& operator << ( ::std::ostream&, uint64 );
#endif

} // namespace sc_dt


#if defined(_MSC_VER) && ( _MSC_VER < 1300 )

    inline
    ::std::ostream&
    operator << ( ::std::ostream& os, sc_dt::int64 a )
    {
        sc_dt::operator << ( os, a );
        return os;
    }

    inline
    ::std::ostream&
    operator << ( ::std::ostream& os, sc_dt::uint64 a )
    {
        sc_dt::operator << ( os, a );
        return os;
    }

#endif


#endif

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