[llvm-bugs] [Bug 29102] Incorrect barriers for atomic intrinsics on ARM64

via llvm-bugs llvm-bugs at lists.llvm.org
Thu Nov 1 07:06:43 PDT 2018


Tim Northover <t.p.northover at gmail.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Tim Northover <t.p.northover at gmail.com> ---
I've now had some fairly detailed discussions with people at ARM and the
consensus is that this "full barrier" constraint is only in the Linux Kernel,
not in C++ (which is the memory model LLVM uses).

So I'm going to close this as invalid for now.

Feel free to reopen if a C++ example turns up where we do the wrong thing, and
reopen/retitle or refile to cover a super_seq_cst (name t.b.d.) ordering.
Obviously it would need someone willing and able to drive the work though.

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