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

// 

// OpenSPARC T1 Processor File: fpu_denorm_3b.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 ============================================

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

//

//      Three bit comparison of two inputs when both will always have

//              leading 0s.

//

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

module fpu_denorm_3b (

        din1,

        din2,

        din2_din1_nz,

        din2_din1_denorm

);

input [2:0]     din1;                   // input 1- 3 bits

input [2:0]     din2;                   // input 2- 3 bits

output          din2_din1_nz;           // input 1 and input 2 are not 0

output          din2_din1_denorm;       // input 1 is a denorm

wire [2:0]       din2_din1_zero;

wire            din2_din1_nz;

wire            din2_din1_denorm;

assign din2_din1_zero[2:0]= (~(din1 | din2));

assign din2_din1_nz= (!(&din2_din1_zero[2:0]));

assign din2_din1_denorm= din2[2]

                || (din2_din1_zero[2] && din2[1])

                || ((&din2_din1_zero[2:1]) && din2[0]);

endmodule