> I use this code snippet tested that both default gcc and clang can’t promise this: Promise what? > $./a.out > 140733249436400 > 140733249436159, 1 > 140733249436152, 4 > 140733249436151, 1 > 140733249436136, 8 As you can see, they are all aligned, which is the usual behavior. I’m not sure if this can be switched off, as I cannot think of a good reason for doing so.