https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122267
--- Comment #7 from Tomasz Kamiński <tkaminsk at gcc dot gnu.org> --- > In the above case s.b has alignment of 4, but that is still not enough for > 64-bit > atomics which require 8 byte alignment for atomicity. With the fix from https://gcc.gnu.org/pipermail/libstdc++/2025-October/063959.html, the binding atomic_ref<double> to x, would again require that x is alignment is 8 bytes.
