https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114865
--- Comment #11 from Peter Dimov <pdimov at gmail dot com> ---
So, basically, C++14 and above initialize the padding of
```
std::atomic<state_type> state{{ 0, 0x2222 }};
```
in `main` to zero, which masks the problem in `generate`. (The problem in
`generate` still exists because the assembly is identical - it just doesn't
trigger because the padding is zero. If we manually poke something nonzero into
the padding, it would (ought to) still break.)
Static variables work for the same reason - the padding is guaranteed zero.
