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

//        __

//   \\__/ o\    (C) 2018  Robert Finch, Waterloo

//    \  __ /    All rights reserved.

//     \/_//     robfinch<remove>@finitron.ca

//       ||

//

//      FT64_InsLength.v

//

// 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 <http://www.gnu.org/licenses/>.    

//

// Computes the length of an instruction.

// There are also other places in code where the length is determined

// without the use of this module.

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

//

`include "FT64_defines.vh"

module FT64_InsLength(ins, len);

input [47:0] ins;

output reg [2:0] len;

always @*

if (ins[`INSTRUCTION_OP]==`CMPRSSD)

        len <= 3'd2;

else

        case(ins[7:6])

        2'd0:   len <= 3'd4;

        2'd1:   len <= 3'd6;

        default:        len <= 3'd2;

        endcase

endmodule