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

// 

// OpenSPARC T1 Processor File: fpu_cnt_lead0_lvl1.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 ============================================

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

//

//      Lowest level of lead 0 counters.  Lead 0 count for 4 bits.

//

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

module fpu_cnt_lead0_lvl1 (

        din,

        din_3_0_eq_0,

        din_3_2_eq_0,

        lead0_4b_0

);

input [3:0]      din;                    // data for lead 0 count bits[3:0]

output          din_3_0_eq_0;           // data in[3:0] is zero

output          din_3_2_eq_0;           // data in[3:2] is zero

output          lead0_4b_0;             // bit[0] of lead 0 count

wire            din_3_0_eq_0;

wire            din_3_2_eq_0;

wire            lead0_4b_0;

assign din_3_0_eq_0= (!(|din[3:0]));

assign din_3_2_eq_0= (!(|din[3:2]));

assign lead0_4b_0= ((!din_3_2_eq_0) && (!din[3]))

                || (din_3_2_eq_0 && (!din[1]));

endmodule