https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95722
James Y Knight <foom at fuhm dot net> changed:
What |Removed |Added
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CC| |foom at fuhm dot net
--- Comment #1 from James Y Knight <foom at fuhm dot net> ---
The fix would be to have libatomic use a lock instead of the lock-free
cmpxchg16b instruction to implement atomic_load. But I think this is impossible
without causing incompatibility with older GCCs.
Older versions of GCC (before GCC 7), and Clang to this day, emitted cmpxchg16b
inline for a 16-byte atomic load when you compile with -mcx16.
And thus, unfortunately, I think if libatomic switched to a lock now, it would
not be compatible with those older programs.
