Subversion Repositories sparc64soc

// ========== Copyright Header Begin ==========================================

// 

// OpenSPARC T1 Processor File: sparc_exu_aluadder64.v

// Copyright (c) 2006 Sun Microsystems, Inc.  All Rights Reserved.

// DO NOT ALTER OR REMOVE COPYRIGHT NOTICES.

// 

// The above named program is free software; you can redistribute it and/or

// modify it under the terms of the GNU General Public

// License version 2 as published by the Free Software Foundation.

// 

// The above named program is distributed in the hope that it will be 

// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

// General Public License for more details.

// 

// You should have received a copy of the GNU General Public

// License along with this work; if not, write to the Free Software

// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.

// 

// ========== Copyright Header End ============================================

////////////////////////////////////////////////////////////////////////

/*

//  Module Name: sparc_exu_aluadder64

//      Description:            This block implements the adder for the sparc alu.

//            It takes two operands and a carry bit.  It adds them together

//                                              and sends the output to adder_out.  It outputs the overflow

//                                              and carry condition codes for both 64 bit and 32 bit operations.

*/

module sparc_exu_aluadder64

  (

   rs1_data,

   rs2_data,

   cin,

   adder_out,

   cout32,

   cout64

   );

   input [63:0]  rs1_data;   // 1st input operand

   input [63:0]  rs2_data;   // 2nd input operand

   input         cin;           // carry in

   output [63:0] adder_out; // result of adder

   output         cout32;         // Cout from lower 32 bit add

   output         cout64;         // cout from 64 bit add

////////////////////////////////////////////

//  Module implementation

////////////////////////////////////////////

   assign      {cout32, adder_out[31:0]} = rs1_data[31:0]+rs2_data[31:0]+

                                           cin;

   assign      {cout64, adder_out[63:32]} = rs1_data[63:32]

               + rs2_data[63:32] + cout32;

endmodule // sparc_exu_aluadder64