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/*****************************************************************************
Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
more contributor license agreements. See the NOTICE file distributed
with this work for additional information regarding copyright ownership.
Accellera licenses this file to you under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with the
License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied. See the License for the specific language governing
permissions and limitations under the License.
*****************************************************************************/
/*****************************************************************************
sign_extension.cpp --
Original Author: Philipp A. Hartmann, OFFIS, 2012-07-17
-----------------------------------------------------------------------------
This test demonatrates a bug in the sc_biguint constructor(?), where
construction from bit-wise expressions with "unsigned int" and sc_bigint
may lead to wrongly sign-extended values (at least on 32-bit machines) when
the destination size is bigger than the source size.
*****************************************************************************/
#include <systemc>
using sc_dt::sc_int;
using sc_dt::sc_uint;
using sc_dt::sc_bigint;
using sc_dt::sc_biguint;
using sc_dt::SC_BIN;
#define DUMP_VAR( Var ) \
std::cout << #Var "=" << (Var).to_string(SC_BIN) << "\n"
int sc_main(int, char*[])
{
sc_int<31> v_sc_int_31_min = (1<<30); // 010...0 (31 bit)
sc_bigint<31> v_sc_bigint_31_min = (1<<30); // 010...0
unsigned int v_uint_max = ~0; // 11....1 (32-bit)
sc_uint<32> v_sc_uint32_max = ~0; // 11....1 (32-bit)
sc_biguint<32> v_sc_biguint_32_max = -1; // 11....1 (32-bit)
DUMP_VAR( v_sc_int_31_min );
DUMP_VAR( v_sc_bigint_31_min );
DUMP_VAR( v_sc_uint32_max );
DUMP_VAR( v_sc_biguint_32_max );
sc_bigint<64> int31_uint = (v_sc_int_31_min & v_uint_max);
// the following expression yields 0b1....10...0 on 32-bit machines
sc_bigint<64> bigint31_uint = (v_sc_bigint_31_min & v_uint_max);
sc_bigint<64> bigint31_uint32 = (v_sc_bigint_31_min & v_sc_uint32_max);
sc_bigint<64> bigint31_biguint32 = (v_sc_bigint_31_min & v_sc_biguint_32_max);
DUMP_VAR( v_sc_bigint_31_min & v_uint_max );
DUMP_VAR( v_sc_bigint_31_min & v_sc_biguint_32_max );
DUMP_VAR(int31_uint);
DUMP_VAR(bigint31_uint); // <--
DUMP_VAR(bigint31_uint32);
DUMP_VAR(bigint31_biguint32);
return 0;
}
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