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// ============================================================================

//        __

//   \\__/ o\    (C) 2020  Robert Finch, Waterloo

//    \  __ /    All rights reserved.

//     \/_//     robfinch@finitron.ca

//       ||

//

//      positCntlz.sv

//

// This source file is free software: you can redistribute it and/or modify

// it under the terms of the GNU Lesser General Public License as published

// by the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// This source file 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 program.  If not, see .

//

// ============================================================================

//

import posit::PSTWID;

module positCntlz(i, o);

parameter PSTWID = `PSTWID;

input [PSTWID-2:0] i;

output [$clog2(PSTWID-1)-1:0] o;

generate begin : gClz

  if (PSTWID <= 8)

    cntlz8 u1 (.i({i,{9-PSTWID{1'b1}}}), .o(o));

  else if (PSTWID <= 16)

    cntlz16 u1 (.i({i,{17-PSTWID{1'b1}}}), .o(o));

  else if (PSTWID <= 24)

    cntlz24 u1 (.i({i,{25-PSTWID{1'b1}}}), .o(o));

  else if (PSTWID <= 32)

    cntlz32 u1 (.i({i,{33-PSTWID{1'b1}}}), .o(o));

  else if (PSTWID <= 48)

    cntlz48 u1 (.i({i,{49-PSTWID{1'b1}}}), .o(o));

  else if (PSTWID <= 64)

    cntlz64 u1 (.i({i,{65-PSTWID{1'b1}}}), .o(o));

  else if (PSTWID <= 80)

    cntlz80 u1 (.i({i,{81-PSTWID{1'b1}}}), .o(o));

  else if (PSTWID <= 96)

    cntlz96 u1 (.i({i,{97-PSTWID{1'b1}}}), .o(o));

  else if (PSTWID <= 128)

    cntlz128 u1 (.i({i,{129-PSTWID{1'b1}}}), .o(o));

end

endgenerate

endmodule