It generates an external function call to `__atomic_compare_exchange_8`, defined in `libatomic.a`. Disassembly of `libatomic.a` is not useful since distros don

It generates an external function call to `__atomic_compare_exchange_8`, defined in `libatomic.a`. Disassembly of `libatomic.a` is not useful since distros don't compile that with 486 support. Go look at the source.