.
  do {
    commit_log_reset(&processor);
    pc = fetch.func(&processor, fetch.insn, state->pc);
    if (pc & 1) {
      // some weird Spike mechanics that we need to bypass.
      switch (pc) {
      case PC_SERIALIZE_BEFORE:
        state->serialized = true;
        break;
      case PC_SERIALIZE_AFTER:
        break;
      default:
        CHECK_S(false) << fmt::format("invalid pc (0x{:08X}).", pc);
      }
    } else
      break;
  } while (true);
  state->pc = pc;