* as a compromise, we enable the optimization only on platforms that we specifically know to
       * work.
       *
       * In the future, the use of Unsafe.getLong() should be replaced by ByteBuffer.getLong(),
       * which will have an efficient native implementation in JDK 9.
       *
       */
      String arch = System.getProperty("os.arch");
      if (Objects.equals(arch, "amd64")) {