// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain, for
// any use, without warranty, 2022 by Antmicro Ltd.
// SPDX-License-Identifier: CC0-1.0

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

   reg [3:0] a, b;

   Test1 t1(clk, a, b);
   Test2 t2(clk, a, b);
   Test3 t3(clk);

   initial begin
      a = 0;
      b = 0;
   end

   always @(posedge clk) begin
      a <= a + 1;
      b = b + 1;

      $display("a = %0d, b = %0d, %0d == %0d", a, b, $sampled(a), $sampled(b));

      if (b >= 10) begin
         $write("*-* All Finished *-*\n");
         $finish;
      end
   end
endmodule

module Test1(
   clk, a, b
   );

   input clk;
   input [3:0] a, b;

   assert property (@(posedge clk) $sampled(a == b) == ($sampled(a) == $sampled(b)));
endmodule

module Test2(
   clk, a, b
   );

   input clk;
   input [3:0] a, b;

   assert property (@(posedge clk) eq(a, b));

   function [0:0] eq([3:0] x, y);
      return x == y;
   endfunction
endmodule

module Test3(
   clk
   );

   input clk;

   assert property (@(posedge clk) $sampled($time) == $time);
endmodule