source: XOpenSparcT1/trunk/T1-FPU/fpu_in2_gt_in1_2b.v @ 6

// ========== Copyright Header Begin ==========================================
// 
// OpenSPARC T1 Processor File: fpu_in2_gt_in1_2b.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 ============================================
///////////////////////////////////////////////////////////////////////////////
//
//      Two bit comparison of two inputs that can have any value.
//
///////////////////////////////////////////////////////////////////////////////

module fpu_in2_gt_in1_2b (
        din1,
        din2,

        din2_neq_din1,
        din2_gt_din1
);


input [1:0]     din1;                   // input 1- 3 bits
input [1:0]     din2;                   // input 2- 3 bits

output          din2_neq_din1;          // input 2 doesn't equal input 1
output          din2_gt_din1;           // input 2 is greater than input 1


wire [1:0]      din2_eq_din1;
wire            din2_neq_din1;
wire            din2_gt_din1;


assign din2_eq_din1[1:0]= (~(din1 ^ din2));

assign din2_neq_din1= (!(&din2_eq_din1));

assign din2_gt_din1= ((!din1[1]) && din2[1])
                || (din2_eq_din1[1] && (!din1[0]) && din2[0]);


endmodule