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

// 

// OpenSPARC T1 Processor File: sparc_ffu_part_add32.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_ffu_part_add32

//      Description: This is the ffu VIS adder.  It can do either

//                              2 16 bit adds or 1 32 bit add.

*/

module sparc_ffu_part_add32 (/*AUTOARG*/

   // Outputs

   z,

   // Inputs

   a, b, cin, add32

   ) ;

   input [31:0] a;

   input [31:0] b;

   input        cin;

   input        add32;

   output [31:0] z;

   wire          cout15; // carry out from lower 16 bit add

   wire          cin16; // carry in to the upper 16 bit add

   assign        cin16 = (add32)? cout15: cin;

   assign      {cout15, z[15:0]} = a[15:0]+b[15:0]+{15'b0,cin};

   assign      z[31:16] = a[31:16]+b[31:16]+{15'b0,cin16};

endmodule // sparc_ffu_part_add32