https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103066
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2021-11-05
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Hongyu Wang from comment #1)
> __sync_val_compare_and_swap will be expanded to
> atomic_compare_exchange_strong
> by default, should we restrict the check and return under
> atomic_compare_exchange_weak which is allowed to fail spuriously?
On x86, "lock cmpxchgl" can fail.
