[Bug target/94649] 16-byte aligned atomic_compare_exchange doesn not generate cmpxcg16b on x86_64

[andysem at mail dot ru via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94649

--- Comment #14 from andysem at mail dot ru ---
(In reply to H.J. Lu from comment #13)
> Fixed for GCC 17 with -m128bit-atomic.

Thanks. Does this new flag also enable generation of cmpxchg16b instead of the
library call? The commit message only mentions loads and stores.