That would make sense, but I would like to know in which situations that happens. And can I manually reduce the alignment in a struct (say to an alignment of 8

That would make sense, but I would like to know in which situations that happens. And can I manually reduce the alignment in a struct (say to an alignment of 8 with a struct that has other fields with alignment of 8) to reduce memory usage? Or ensure that a location uses an alignment of 16 in places I want the higher performance.