xref: /gem5/src/systemc/tests/systemc/misc/stars/star130782/test.cpp

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  test.cpp --

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

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

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/*
Subject: range() of sc_biguint
From: "Masahiro Taniguchi" <taniguchi.masahiro@lsi.melco.co.jp>
Date: Mon, 12 Nov 2001 16:29:04 +0900
To: "systemc-forum" <systemc-forum@systemc.org>

Hi all,

I found a strange simulation result regarding sc_biguint.
I attached the example about it.
The example described 3 case.
 1. Write non-0
 2. Write 0 without cast
 3. Write 0 with cast (sc_biguint<8>)
The wrong result appears in the 2nd case.
Is this a bug of SystemC?

-------Environment-------
 SystemC V1.0.2 and V2.0
 GCC 2.95.2
 Sun Solaris
-------------------------

Regards,

Masahiro Taniguchi
Mitsubishi Electric Corporation
JAPAN

------------------------------------------------------------
*/

#include "systemc.h"

int
sc_main( int, char*[] )
{
    int i;
    int index0,index1;
    sc_biguint<128> A;
    sc_uint<16> B;
    sc_biguint<128> Y;

    A = 0;
    Y = 0;
    cout << "A = " << A.to_string(SC_HEX) << endl;
    cout << "Y = " << Y.to_string(SC_HEX) << endl << endl;

    // 1st Case
    A = "0xffffffffffffffffffffffffffffffff";
    B = 0;

    for(i=15;i>=0;i--)
    {
        index0 = 8*(i+1)-1;
        index1 = 8* i;
        if(B[i] == 0) {
            Y.range(index0,index1) = A.range(index0,index1);
        }
    }

    cout << "A = " << A.to_string(SC_HEX) << endl;
    cout << "B = " << hex << B << endl;
    cout << "Y = " << Y.to_string(SC_HEX) << endl << endl;

    // 2nd Case
    A = 0;
    B = 0;

    for(i=15;i>=0;i--)
    {
        index0 = 8*(i+1)-1;
        index1 = 8* i;
        if(B[i] == 0) {
            Y.range(index0,index1) = A.range(index0,index1);
        }
    }

    cout << "A = " << A.to_string(SC_HEX) << endl;
    cout << "B = " << hex << B << endl;
    cout << "Y = " << Y.to_string(SC_HEX) << endl << endl;

    // 3rd Case
    A = 0;
    B = 0;

    for(i=15;i>=0;i--)
    {
        index0 = 8*(i+1)-1;
        index1 = 8* i;
        if(B[i] == 0) {
            Y.range(index0,index1) = (sc_biguint<8>)A.range(index0,index1);
        }
    }

    cout << "A = " << A.to_string(SC_HEX) << endl;
    cout << "B = " << hex << B << endl;
    cout << "Y = " << Y.to_string(SC_HEX) << endl << endl;

    return(0);
}