xref: /gem5/ext/systemc/src/sysc/datatypes/int/sc_nbdefs.cpp

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  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
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  with this work for additional information regarding copyright ownership.
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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.

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// $Log: sc_nbdefs.cpp,v $
// Revision 1.3  2011/02/18 20:19:15  acg
//  Andy Goodrich: updating Copyright notice.
//
// Revision 1.2  2009/05/22 16:06:29  acg
//  Andy Goodrich: process control updates.
//
// Revision 1.1.1.1  2006/12/15 20:20:05  acg
// SystemC 2.3
//
// Revision 1.3  2006/01/13 18:49:32  acg
// Added $Log command so that CVS check in comments are reproduced in the
// source.
//

#include "sysc/datatypes/int/sc_nbdefs.h"


namespace sc_dt
{

#ifdef SC_MAX_NBITS
const int MAX_NDIGITS      = DIV_CEIL(SC_MAX_NBITS) + 2;
// 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 the long long type. This type is not in the standard
// but is usually supported by compilers.
#if !defined(_WIN32) || defined(__MINGW32__)
const uint64 UINT64_ZERO   = 0ULL;
const uint64 UINT64_ONE    = 1ULL;
const uint64 UINT64_32ONES = 0x00000000ffffffffULL;
#else
const uint64 UINT64_ZERO   = 0i64;
const uint64 UINT64_ONE    = 1i64;
const uint64 UINT64_32ONES = 0x00000000ffffffffi64;
#endif

const small_type NB_DEFAULT_BASE = SC_DEC;

#ifndef _32BIT_
const uint64 UINT_ZERO = UINT64_ZERO;
const uint64 UINT_ONE  = UINT64_ONE;
#else
const unsigned int UINT_ZERO = 0U;
const unsigned int UINT_ONE  = 1U;
#endif

} // namespace sc_dt