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class foo;

  static task static_add(int a, int b, output int c);

    c = a + b;

  endtask

  task nonstatic_add(int a, int b, output int c);

    c = a + b;

  endtask

  static task do_test();

    foo handle = new();

    longint N = 500000000; // iterations

    longint M = 2; // rounds

    $display("Test static");

    repeat(M) begin

      $system("echo $(($(date +%s%N)/1000000)) > ./st"); // that's how we get milliseconds

      repeat(N) begin

        int c;

        foo::static_add(1, 2, c); 

      end

      $system("echo $(($(date +%s%N)/1000000)) > ./end");

      $system("s=`cat ./st`; e=`cat ./end`; echo `expr $e - $s`");

    end

    $display("Test automatic");

    repeat(M) begin

      $system("echo $(($(date +%s%N)/1000000)) > ./st");

      repeat(N) begin

        int c;

        handle.nonstatic_add(1, 2, c);

      end

      $system("echo $(($(date +%s%N)/1000000)) > ./end");

      $system("s=`cat ./st`; e=`cat ./end`; echo `expr $e - $s`");

    end

  endtask

endclass

​

module test();

  foo handle = new();

  task automatic do_test();

    longint N = 500000000; // iterations

    longint M = 2; // rounds

    $display("Test static");

    repeat(M) begin

      $system("echo $(($(date +%s%N)/1000000)) > ./st"); // that's how we get milliseconds

      repeat(N) begin

        int c;

        foo::static_add(1, 2, c); 

      end

      $system("echo $(($(date +%s%N)/1000000)) > ./end");

      $system("s=`cat ./st`; e=`cat ./end`; echo `expr $e - $s`");

    end

    $display("Test non-static");

    repeat(M) begin

      $system("echo $(($(date +%s%N)/1000000)) > ./st");

      repeat(N) begin

        int c;

        handle.nonstatic_add(1, 2, c);

      end

      $system("echo $(($(date +%s%N)/1000000)) > ./end");

      $system("s=`cat ./st`; e=`cat ./end`; echo `expr $e - $s`");

    end

  endtask

  initial begin

    automatic bit is_module = 0;

    if (is_module)

      do_test();

    else

      foo::do_test();

  end

endmodule