https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80835
Peter Cordes <peter at cordes dot ca> changed:
What |Removed |Added
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See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=70490
--- Comment #1 from Peter Cordes <peter at cordes dot ca> ---
related: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70490: lack of a way for
CPUs to advertise when 16B SSE loads/stores are atomic, and that cmpxchg16b
segfaults on mmap(PROT_READ), which is one of the reasons for not inlining
cmpxchg16b (https://gcc.gnu.org/ml/gcc-patches/2017-01/msg02344.html)
I tried to add a CC to Torvald Riegel, since a read-mostly pointer +
ABA-counter maybe be a relevant use-case for 16-byte atomic objects, where the
reads only want the current pointer value.
Using locking for 16B objects would break this use-case.
