[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 #12 from andysem at mail dot ru ---
Is read-only memory a valid use case for __atomic intrinsics anyway? These
intrinsics are primarily targeted to implement std::atomic, but does the
standard guarantee these operations (primarily, std::atomic::load()) do not
issue writes to the memory?