core_wrapper: Use finished and !reset to determine termination

hw/rtl/VX_core_wrapper.sv

@@ -495,15 +495,20 @@ module Vortex import VX_gpu_pkg::*; #(
     //     .busy(busy)
     // );
 
-    always @(*) begin
-        if (busy === 1'b0) begin
-            $display("---------------- no more active warps ----------------");
+    always @(posedge clock) begin
+        if (!reset) begin
+            if (finished) begin
                 `ifdef SIMULATION
-            if ($time >= 60000) begin
-              $display("simulation has probably ended. exiting");
-              @(posedge clock) $finish();
-            end
+                    $display("---------------- core%2d has no more active warps ----------------", CORE_ID);
+                    $display("simulation has ended. exiting");
+                    $finish();
                 `endif
+                // `ifdef SIMULATION
+                // if ($time >= 60000) begin
+                //   $display("simulation has probably ended. exiting");
+                //   @(posedge clock) $finish();
+                // end
+                // `endif
                 // TODO: lane assumed to be 4
                 // `ifndef SYNTHESIS
                 // for (integer j = 0; j < `NUM_WARPS; j++) begin
@@ -519,6 +524,7 @@ module Vortex import VX_gpu_pkg::*; #(
                 // @(posedge clock) $finish();
             end
         end
+    end
 
 endmodule : Vortex