Function padding_physical

ir/pointer.cpp:33–37

}

static unsigned padding_physical() {
  auto l = total_bits_logical();
  auto p = total_bits_physical();
  return p > l ? 0 : l - p;
}

static expr prepend_if(const expr &pre, expr &&e, bool prepend) {
  return prepend ? pre.concat(e) : std::move(e);