xref: /gem5/src/systemc/tests/systemc/misc/sim_tests/popc/popc.cpp

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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.
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  (the "License"); you may not use this file except in compliance with the
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  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
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/*****************************************************************************

  popc.cpp --

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

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

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

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

      Name, Affiliation, Date:
  Description of Modification:

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

#include "systemc.h"

/*
 * Test bench
 */

SC_MODULE( proc1 )
{
  SC_HAS_PROCESS( proc1 );

  sc_in_clk clk;

  // Inputs
  sc_in<bool> data_ack;
  sc_in<int>  popc;
  // Outputs
  sc_out<bool> reset;
  sc_out<bool> data_ready;
  sc_out<int>  in;

  // Constructor
  proc1( sc_module_name NAME,
	 sc_clock& CLK,
	 sc_signal<bool>& DATA_ACK,
         sc_signal<int>& POPC,
         sc_signal<bool>& RESET,
	 sc_signal<bool>& DATA_READY,
         sc_signal<int>& IN_ )
  {
    clk(CLK);
    data_ack(DATA_ACK); popc(POPC);
    reset(RESET); data_ready(DATA_READY); in(IN_);
	SC_CTHREAD( entry, clk.pos() );
  }

  // Process functionality goes here
  void entry();
};

/*
 * popc - The process doing the population count
 *
 */

SC_MODULE( proc2 )
{
  SC_HAS_PROCESS( proc2 );

  sc_in_clk clk;

  // Inputs
  sc_in<bool> reset;
  sc_in<bool> data_ready;
  sc_in<int>  in;
  // Outputs
  sc_out<bool> data_ack;
  sc_out<int>  popc;

  // Internal variables
  int c;
  int t;
  int no;

  proc2( sc_module_name NAME,
	 sc_clock& CLK,
         sc_signal<bool>& RESET,
	 sc_signal<bool>& DATA_READY,
         sc_signal<int>& IN_,
	 sc_signal<bool>& DATA_ACK,
         sc_signal<int>& POPC )
  {
    clk(CLK);
    reset(RESET);
    data_ready(DATA_READY);
    in(IN_);
    data_ack(DATA_ACK);
    popc(POPC);
    SC_CTHREAD( entry, clk.pos() );
    reset_signal_is(reset,true);
    c = 0;
    t = 0;
  }

  // Process functionality
  void entry();
};


/*
 * Testbench functionality
 */

void proc1::entry()
{
    int i;
    int j;

    j = 1;
    i = 0;
    data_ready.write(false);
    reset.write(false);

    wait();

    while(true){
	in.write(j);

        data_ready.write(true);
        do { wait(); } while (data_ack == false);
        data_ready.write(false);
        do { wait(); } while (data_ack == true);

        char buf[BUFSIZ];
        sprintf( buf, "Input: %7d   Population Count: %3d", j, popc.read() );
        cout << buf << endl;

	i++;

	if( i == 3){
		reset.write(true);
		wait();
		reset.write(false);
		wait(2);
	}

	if( i == 16)
	    sc_stop();

	j = (j<<1)|1;
    }
}


/*
 * popc - functionality
 */

void proc2::entry()
{
    // Reset behavior
    no = 0;
    data_ack.write(false);

    wait();

    while (true) {
        do { wait(); } while (data_ready == false);

	t = in.read();
	c = 0;
	while( t ){
	    c++;
	    t &= (t-1);
	    wait();
	}

	no++;
        popc.write(c);

        data_ack.write(true);
        do { wait(); } while (data_ready == true);
        data_ack.write(false);
    }
}


int
sc_main(int argc, char *argv[])
{
  sc_signal<bool>  data_ready("Ready");
  sc_signal<bool>  data_ack("Ack");
  sc_signal<int>   in;
  sc_signal<int>   popc;
  sc_signal<bool>  reset;

  sc_clock clock("CLOCK", 10, SC_NS, 0.5, 0.0, SC_NS);

  proc1 TestBench("TestBench", clock, data_ack, popc, reset, data_ready, in);
  proc2 Popc("Popc", clock, reset, data_ready, in,  data_ack, popc);


  // Create trace file
  sc_trace_file *tf = sc_create_vcd_trace_file("tracefile");
  // Trace signals
  sc_trace(tf, data_ready, "data_ready");
  sc_trace(tf, data_ack, "data_ack");
  sc_trace(tf, in, "in");
  sc_trace(tf, popc, "popc");
  sc_trace(tf, reset, "reset");
  // sc_trace(tf, clock.signal(), "Clock");
  sc_trace(tf, clock, "Clock");
  // Trace internal variables
  sc_trace(tf, Popc.t, "Popc.t");
  sc_trace(tf, Popc.c, "Popc.c");
  sc_trace(tf, Popc.no, "Popc.no");

  sc_start();
  return 0;
}