>>>>> John Yates writes: John> Do I read this correctly? Are you truly saying that two structs John> with identical layout will trigger different code sequences just John> because one was declared packed? Yes. Why is that strange? attribute packed assigns the smallest possible alignment so that the compiler composes the layout of the structure or bitfield in the more compact form possible. Even if the layout produced is the same, the smaller alignment is carried around with the fields and causes the compiler to use more conservative access operations. David
