xref: /gem5/src/systemc/tests/systemc/misc/synth/bubble/bubble.h

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  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
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  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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/*****************************************************************************

  bubble.h --

  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:

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

/******************************************************************************/
/***************************   bubble Class Definition     ********************/
/******************************************************************************/

#include "common.h"

SC_MODULE( BUBBLE )
{
    SC_HAS_PROCESS( BUBBLE );

    sc_in_clk clk;

    const sc_signal<bool>& 	reset;
    const sc_signal<bool>& 	in_ok;
    const sc_signal<bool>& 	out_ok;
    	  sc_signal<bool>& 	instrb;
    	  sc_signal<bool>& 	outstrb;
    const signal_bool_vector    &a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8;// -128 to 127
          signal_bool_vector    &d1,&d2,&d3,&d4,&d5,&d6,&d7,&d8;// -128 to 127

    BUBBLE( 	sc_module_name  		NAME,
	       	      sc_clock& 		TICK_P,
    		const sc_signal<bool>& 		RESET,
    		const sc_signal<bool>& 		IN_OK,
    		const sc_signal<bool>& 		OUT_OK,
    	  	      sc_signal<bool>& 		INSTRB,
    	  	      sc_signal<bool>& 		OUTSTRB,
          	const signal_bool_vector& 	A1,
		const signal_bool_vector&	A2,
		const signal_bool_vector&	A3,
		const signal_bool_vector&	A4,
		const signal_bool_vector&	A5,
		const signal_bool_vector&	A6,
		const signal_bool_vector&	A7,
		const signal_bool_vector&	A8,
          	      signal_bool_vector& 	D1,
		      signal_bool_vector&	D2,
		      signal_bool_vector&	D3,
		      signal_bool_vector&	D4,
		      signal_bool_vector&	D5,
		      signal_bool_vector&	D6,
		      signal_bool_vector&	D7,
		      signal_bool_vector&	D8
              )
        :
		reset	(RESET),
		in_ok	(IN_OK),
		out_ok	(OUT_OK),
		instrb	(INSTRB),
		outstrb	(OUTSTRB),
		a1	(A1), a2(A2), a3(A3), a4(A4),
		a5	(A5), a6(A6), a7(A7), a8(A8),
		d1	(D1), d2(D2), d3(D3), d4(D4),
		d5	(D5), d6(D6), d7(D7), d8(D8)
    {
        clk(TICK_P);
        SC_CTHREAD( entry, clk.pos() );
	reset_signal_is(reset,true);
    }
    void entry();
};

/******************************************************************************/
/***************************   bubble Entry Function     **********************/
/******************************************************************************/
/**									     **/
/**  This function is most likely a bubble sort algorithm ???		     **/
/**									     **/
/******************************************************************************/
void
BUBBLE::entry()
{
  bool_vector B[9];
  bool_vector C[9];
  int     		minel;
  int     		x;
  int			i;
  int			j;

// RESET INITIALIZATION

  while(true) {

    instrb.write(false);
    outstrb.write(false);
    minel = -500;
    x = 0;
    d1.write(0);
    d2.write(0);
    d3.write(0);
    d4.write(0);
    d5.write(0);
    d6.write(0);
    d7.write(0);
    d8.write(0);
    for (i = 1; i <= 8; i++) {
        B[i] = 0;
    }
    for (i = 1; i <= 8; i++) {
        C[i] = 0;
    }
    wait();

// READY SIGNAL FOR INPUT DATA

    wait();
    instrb.write(true);
    wait();

// INPUT HANDSHAKE & INPUT READ

    do { wait(); } while (!in_ok);

    instrb.write(false);
    wait();

    B[1] = a1.read(); B[2] = a2.read(); B[3] = a3.read(); B[4] = a4.read();
    B[5] = a5.read(); B[6] = a6.read(); B[7] = a7.read(); B[8] = a8.read();
    wait();

lout << "STARTING BUBBLE SORT" << endl;
// BUBBLE SORT ALGORITHM

    // EVERY ELEMENT
    for (i = 1; i <= 7; i++) {

      if (B[i].to_int() > B[i+1].to_int()) {  	// if #1
         for (j = 1; j <= 8; j++) {
           C[j] = B[j];                          	// COPY
         }

         B[i] = B[i+1];
         B[i+1] = C[i];
         minel = C[i].to_int();                    	// MOVE

         for (j = 1; j <= 8; j++) {
           C[j] = B[j];                          	// COPY
         }

         if (i >= 2) {  // if #2
            x = i;
            while (x > 1) {
 	      if (B[x].to_int() > B[x-1].to_int()) {
                  break;
              }
              else {
                  for (j = 1; j <= 8; j++) {
                    C[j] = B[j];
                  }

                  B[x] = B[x-1];
                  B[x-1] = C[x];                  	// MOVE

                  for (j = 1; j <= 8; j++) {
                    C[j] = B[j];               		// COPY
	          }
	      }  // end else
              x = x-1;
            }  //  end WHL Loop
         }  // end if #2
      }  // end if #1;
    }  // end FL3 Loop
    wait();

// WRITE OUTPUT & OUTPUT HANDSHAKE

    d1.write(C[1]); d2.write(C[2]); d3.write(C[3]); d4.write(C[4]);
    d5.write(C[5]); d6.write(C[6]); d7.write(C[7]); d8.write(C[8]);
    outstrb.write(true);	// Ready to give output data
    wait();

    do { wait(); } while (!out_ok);

    outstrb.write(false);
    wait();

  }  // end Reset Loop

}