I'm not very experienced with low-level programming, but doesn't the single-responsibility principle suggest that a purpose-built module should handle packing/u

I'm not very experienced with low-level programming, but doesn't the single-responsibility principle suggest that a purpose-built module should handle packing/unpacking of memory objects even if you are writing this module by hand? I'm sure there are cases where even the overhead of calling and running these procedures is too much, but in many cases no further optimization would be needed.