SVIncCompil/Testcases/Verilator/t_order_comboloop.v

// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed into the Public Domain, for any use,
// without warranty, 2003 by Wilson Snyder.

module t (/*AUTOARG*/
   // Inputs
   clk
   );
   input clk;
   integer cyc; initial cyc=1;

   // verilator lint_off UNOPT
   // verilator lint_off UNOPTFLAT
   reg [31:0] runner;  initial runner = 5;
   reg [31:0] runnerm1;
   reg [59:0] runnerq;
   reg [89:0] runnerw;
   always @ (posedge clk) begin
      if (cyc!=0) begin
	 cyc <= cyc + 1;
	 if (cyc==1) begin
`ifdef verilator
	    if (runner != 0) $stop;  // Initial settlement failed
`endif
	 end
	 if (cyc==2) begin
	    runner = 20;
	    runnerq = 60'h0;
	    runnerw = 90'h0;
	 end
	 if (cyc==3) begin
	    if (runner != 0) $stop;
	    $write("*-* All Finished *-*\n");
	    $finish;
	 end
      end
   end

   // This forms a "loop" where we keep going through the always till runner=0
   // This isn't "regular" beh code, but ensures our change detection is working properly
   always @ (/*AS*/runner) begin
      runnerm1 = runner - 32'd1;
   end

   always @ (/*AS*/runnerm1) begin
      if (runner > 0) begin
	 runner = runnerm1;
	 runnerq = runnerq - 60'd1;
	 runnerw = runnerw - 90'd1;
	 $write ("[%0t] runner=%d\n", $time, runner);
      end
   end

endmodule