[Bug target/80878] -mcx16 (enable 128 bit CAS) on x86_64 seems not to work on 7.1.0

[andysem at mail dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80878

--- Comment #14 from andysem at mail dot ru ---
> On Intel, all CAS operations always write, even if thr compare failed.

I understand that. The question is whether this is allowed behavior for
atd::atomic::load() operation according to the C++ standard.