8bitworkshop/test/cli/verilog/t_concat_opt.v

// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed into the Public Domain, for any use,
// without warranty, 2004 by Jie Xu.
// SPDX-License-Identifier: CC0-1.0
//
// The test was added together with the concat optimization.

module t (/*AUTOARG*/
   // Inputs
   clk
   );

   input clk;
   integer cyc; initial cyc=1;

   reg [31:0] in_a;
   reg [31:0] in_b;
   reg [31:0] in_c;
   reg [31:0] in_d;
   reg [31:0] in_e;
   reg [15:0] in_f;
   wire [31:0] in_g;

   assign in_g =  in_a << 4;

   reg [31:0] out_x;
   reg [31:0] out_y;
   reg [31:0] out_z;
   reg [31:0] out_o;
   reg [31:0] out_p;
   reg [31:0] out_q;

   assign out_x = {in_a[31:16] & in_f, in_a[15:0] & in_f};
   assign out_y = {in_a[31:18] & in_b[31:18], in_a[17:0] & in_b[17:0]};
   assign out_z = {in_c[31:14] & in_d[31:14] & in_e[31:14], in_c[13:0] & in_d[13:0] & in_e[13:0]};
   assign out_o = out_z | out_y;
   assign out_p = {in_a[31:16] & in_f | in_e[31:16], in_a[15:0] & in_f | in_e[15:0]};
   assign out_q = {{in_a[31:25] ^ in_g[31:25], in_a[24:16] ^ in_g[24:16]}, {in_a[15:5] ^ in_g[15:5], in_a[4:0] ^ in_g[4:0]}};

   always @ (posedge clk) begin
      if (cyc!=0) begin
	 cyc <= cyc + 1;
         in_a <= cyc;
         in_b <= cyc + 1;
         in_c <= cyc + 3;
         in_d <= cyc + 8;
         in_e <= cyc;
         in_f <= cyc[15:0];

         if (out_x != (in_a & {2{in_f}}))
             $stop;
         if (out_y != (in_a&in_b))
             $stop;
         if (out_z != (in_e&in_d&in_c))
             $stop;
         if (out_o != (((in_a&in_b)|(in_c&in_e&in_d))))
             $stop;
         if (out_p != (in_a & {2{in_f}} | in_e))
             $stop;
         if (out_q != (in_a ^ in_g))
             $stop;

	 if (cyc==100) begin
	    $write("*-* All Finished *-*\n");
	    $finish;
	 end
      end
   end

endmodule