https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108659
--- Comment #11 from Wilco <wilco at gcc dot gnu.org> --- (In reply to Niall Douglas from comment #10) > (In reply to Jakub Jelinek from comment #9) > > (In reply to Wilco from comment #8) > > > Yes that sounds like a reasonable approach. > > > > I don't think so. Not all variables on which __atomic_* intrinsics are used > > are actually _Atomic, the vars can be embedded in const aggregates etc. > > I'd have the attribute propagate to enclosing types, like over-alignment. Yes, a structure with a 128-bit Atomic type in a subfield/union would be forced to rwdata. And arbitrary casts (eg. from char* to an atomic type) wouldn't work due to Atomics requiring strict alignment. A 128-bit atomic type might have a higher alignment than a 128-bit integer so even casting that seems questionable.
