source: sources/src/sc_bigint.h @ 57

/*------------------------------------------------------------\
  |                                                             |
  | Tool    :                  systemcass                       |
  |                                                             |
  | File    :                 sc_bigint.h                      |
  |                                                             |
  | Author  :                 Buchmann Richard                  |
  |                                                             |
  | Date    :                   09_07_2004                      |
  |                                                             |
  \------------------------------------------------------------*/
#ifndef __SC_BIGINT_H__
#define __SC_BIGINT_H__

#include <sc_bit.h>
#include <sc_logic.h>
#include <sc_bv.h>

// ----------------------------------------------------------------------------
//  CLASS : sc_bigint<W>
//
// ----------------------------------------------------------------------------

#include "sc_nbdefs.h"

namespace sc_dt {

#define MASK32(W) ((~ (const uint32)0) >> (sizeof (uint32) * 8 - W))
#define MASK64(W) ((~ (const uint64)0) >> (sizeof (uint64) * 8 - W))

template<int W> struct s_bigint_type { typedef uint64 uint_type;};
#define DECLAR_BIGINT_TYPE(W) template<> struct s_bigint_type<W> { typedef uint16 uint_type; }// not declared as uint16 because << operator threats like a character
DECLAR_BIGINT_TYPE(1);
DECLAR_BIGINT_TYPE(2);
DECLAR_BIGINT_TYPE(3);
DECLAR_BIGINT_TYPE(4);
DECLAR_BIGINT_TYPE(5);
DECLAR_BIGINT_TYPE(6);
DECLAR_BIGINT_TYPE(7);
DECLAR_BIGINT_TYPE(8);
#undef DECLAR_BIGINT_TYPE

#define DECLAR_BIGINT_TYPE(W) template<> struct s_bigint_type<W> { typedef uint16 uint_type; }
DECLAR_BIGINT_TYPE(9);
DECLAR_BIGINT_TYPE(10);
DECLAR_BIGINT_TYPE(11);
DECLAR_BIGINT_TYPE(12);
DECLAR_BIGINT_TYPE(13);
DECLAR_BIGINT_TYPE(14);
DECLAR_BIGINT_TYPE(15);
DECLAR_BIGINT_TYPE(16);
#undef DECLAR_BIGINT_TYPE

#define DECLAR_BIGINT_TYPE(W) template<> struct s_bigint_type<W> { typedef uint32 uint_type; }
DECLAR_BIGINT_TYPE(17);
DECLAR_BIGINT_TYPE(18);
DECLAR_BIGINT_TYPE(19);
DECLAR_BIGINT_TYPE(20);
DECLAR_BIGINT_TYPE(21);
DECLAR_BIGINT_TYPE(22);
DECLAR_BIGINT_TYPE(23);
DECLAR_BIGINT_TYPE(24);
DECLAR_BIGINT_TYPE(25);
DECLAR_BIGINT_TYPE(26);
DECLAR_BIGINT_TYPE(27);
DECLAR_BIGINT_TYPE(28);
DECLAR_BIGINT_TYPE(29);
DECLAR_BIGINT_TYPE(30);
DECLAR_BIGINT_TYPE(31);
DECLAR_BIGINT_TYPE(32);
#undef DECLAR_BIGINT_TYPE

template< int W /* = SC_INTWIDTH */>
class sc_bigint {
    typedef sc_bigint<W> this_type;
    typedef typename s_int_type<W>::int_type data_type;

    typedef data_type sc_uint_subref;
    typedef data_type sc_uint_subref_r;

    union {
        data_type valW:W;
        bool valB[W];
        data_type val;
    };
    
    void check() {
        if (W > 64) {
            std::cerr << "sc_bigint with W > 64 is not supported.\n";
            exit (20040528);
        }
    }

    public:
    sc_bigint() {
        check ();
        val = 0;
    }

    sc_bigint(data_type val_) {
        check ();
        val = 0;
        write (val_);
    }

    template <int W2> explicit sc_bigint(const sc_bigint<W2> & val_) {
        write (val_.read());
    }

    inline const data_type & read() const {
        return val;
    }

    inline operator const data_type & () const {
        return read ();
    }

    //  inline void write(int64 val_) { val = val_ & MASK64(W); }
    //  inline void write(signed int val_)   { val = val_ & MASK32(W); }
    
    inline void write(data_type val_) {
        valW = val_;
    }
    
    template <int W2> inline void write (const sc_bigint<W2> val_) {
        write (val_.read ());
    }

    inline void write (const sc_bigint<W> val_) {
        write (val_.read());
    }

    template <typename T> inline sc_bigint & operator = (const T & val_) {
        write (val_);
        return *this;
    }

    inline uint32 to_uint() const {
        return val & MASK32(W);
    }

    inline int32 to_int() const {
        return val & MASK32(W);
    }

    inline uint64 to_uint64() const {
        return val & MASK64(W);
    }

    inline int64 to_int64() const {
        return val & MASK64(W);
    }

    template <typename T>
    inline sc_bigint & operator <<= (T v) {
        valW <<= v;
        return *this;
    }

    template <typename T>
    inline sc_bigint & operator >>= (T v) {
        valW >>= v;
        return *this;
    }

    template <typename T>
    inline sc_bigint & operator += (T v) {
        valW += v;
        return *this;
    }

    template <typename T>
    inline sc_bigint & operator -= (T v) {
        valW -= v;
        return *this;
    }

    template <typename T>
    inline sc_bigint & operator *= (T v) {
        valW *= v;
        return *this;
    }

    template <typename T>
    inline sc_bigint & operator /= (T v) {
        valW /= v;
        return *this;
    }

    template <typename T>
    inline sc_bigint & operator %= (T v) {
        valW %= v;
        return *this;
    }

    template <typename T>
    inline sc_bigint & operator &= (T v) {
        valW &= v;
        return *this;
    }

    template <typename T>
    inline sc_bigint & operator |= (T v) {
        valW |= v;
        return *this;
    }

    template <typename T>
    inline sc_bigint & operator ^= (T v) {
        valW ^= v;
        return *this;
    }

    inline sc_uint_bit_ref & operator [] (int v) {
        return valB[v];
    }

    inline sc_uint_bit_ref_r& operator [] (int v) const {
        return valB[v];
    }

    inline sc_uint_subref range(int left, int right) {
        return (((~0) >> (sizeof (data_type) * 8 - left)) & val) >> right;
    }

    inline sc_uint_subref_r range(int left, int right) const {
        return (((~0) >> (sizeof (data_type) * 8 - left)) & val) >> right;
    }

};

} /* end of sc_dt namespace */

#endif /* __SC_BIGINT_H__ */


/*
# Local Variables:
# tab-width: 4;
# c-basic-offset: 4;
# c-file-offsets:((innamespace . 0)(inline-open . 0));
# indent-tabs-mode: nil;
# End:
#
# vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=4:softtabstop=4
*/