xref: /gem5/src/systemc/tests/systemc/datatypes/int/arith/arith10/arith10.cpp

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

  arith10.cpp --

  Original Author: Martin Janssen, Synopsys, Inc., 2002-02-15

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

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

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

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  Description of Modification:

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#include <stdlib.h>
#include "systemc.h"
#include "isaac.h"

QTIsaac<8> rng;		// Platform independent random number generator.

int
sc_main( int argc, char* argv[] )
{
    signed int vali[5] = { 0, 1, -1, 7, -8 };
    signed int valj[5] = { 0, 1, -1, 7, -8 };

    for (int i = 3; i < 32; ++i) {
        for (int j = 3; j < 32; ++j) {
            cout << "i = " << i << ", j = " << j << endl;

            sc_signed x(i);
            sc_signed y(j);
            sc_signed z(65), q(65);

            vali[3] = (1 << (i - 1)) - 1;
            vali[4] = - (1 << (i - 1));

            valj[3] = (1 << (j - 1)) - 1;
            valj[4] = - (1 << (j - 1));

            for (int ii = 0; ii < 100; ++ii) {
                for (int jj = 0; jj < 100; ++jj) {
                    signed int qi = (ii < 5) ? vali[ii] : (rng.rand() & ((1 << i) - 1));
                    signed int qj = (jj < 5) ? valj[jj] : (rng.rand() & ((1 << j) - 1));

                    if (qi & (1 << (i - 1))) {
                        qi = (qi << (32 - i)) >> (32 - i);
                    }
                    if (qj & (1 << (j - 1))) {
                        qj = (qj << (32 - j)) >> (32 - j);
                    }

                    x = qi;
                    y = qj;
                    z = x * y;
                    sc_assert( static_cast<sc_bigint<32> >( z.range(31,0) ) ==
                            (qi * qj) );
                    bool s;
                    s = ((x < 0) != (y < 0));
                    sc_signed x2(i+1);
                    x2 = x;
                    if (x < 0) {
                        x2 = - x;
                    }
                    sc_signed y2(j+1);
                    y2 = y;
                    if (y < 0) {
                        y2 = - y;
                    }

                    sc_unsigned xhi(16), xlo(16);
                    sc_unsigned yhi(16), ylo(16);
		    sc_unsigned zero(16);
		    zero = 0;
                    xlo = i > 14 ? x2.range(15,0) : x2.range(i,0);
                    xhi = i > 15 ? x2.range(i,16) : zero;
                    ylo = j > 14 ? y2.range(15,0) : y2.range(j,0);
                    yhi = j > 15 ? y2.range(j,16) : zero;
                    q = (xlo * ylo) +
                        (xhi * ylo + xlo * yhi) * 65536 +
                        ((xhi * yhi) * 65536) * 65536;
                    if (s)
                        q = - q;
                    if (z.range(63,0) != q.range(63,0)) {
                        cout << "xlo = " << xlo << endl;
                        cout << "xhi = " << xhi << endl;
                        cout << "ylo = " << ylo << endl;
                        cout << "yhi = " << yhi << endl;
                        sc_assert(false);
                    }
                }
            }
        }
    }
    return 0;
}