xref: /gem5/src/systemc/tests/systemc/datatypes/int/arith/arith09/arith09.cpp

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

  arith09.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[] )
{
    unsigned int vali[5] = { 0, 1, (unsigned)-1, 7, (unsigned)-8 };
    unsigned int valj[5] = { 0, 1, (unsigned)-1, 7, (unsigned)-8 };

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

            sc_unsigned x(i);
            sc_unsigned y(j);
            sc_unsigned z(64), q(64);

            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) {
                    unsigned qi = (ii < 5) ? vali[ii] :
		                             (rng.rand() & ((1 << i) - 1));
                    unsigned 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( (sc_unsigned)( z.range(31,0) ) ==
			    (qi * qj) );
                    if ( i < 17 )
                    {
                        if ( j < 17 ) // (i < 17)
                        {
                            q = (x.range(i-1,0) * y.range(j-1,0));
                        }
                        else // (j >= 17) (i < 17)
                        {
                            q = (x.range(i-1,0) * y.range(15,0)) +
                                ( x.range(i-1,0) * y.range(j-1,16) ) * 65536;
                        }
		    }
                    else
                    {
                        if ( j < 17 ) // (i >= 17)
                        {
                            q = (x.range(15,0) * y.range(j-1,0)) +
                                (x.range(i-1,16) * y.range(j-1,0)) * 65536;
                        }
                        else // (j >= 17) (i >= 17)
                        {
                            q = (x.range(15,0) * y.range(15,0)) +
                                (x.range(i-1,16) * y.range(15,0) +
                                 x.range(15,0) * y.range(j-1,16)) * 65536 +
                                ((x.range(i-1,16) * y.range(j-1,16) * 65536)
                                * 65536);
                        }
                    }
                    sc_assert(z == q);

                    if (y != 0) {
                        z /= y;
                        sc_assert(z == x);
                    }
                }
            }
        }
    }
    return 0;
}