https://bugs.kde.org/show_bug.cgi?id=444399
--- Comment #5 from Julian Seward <jsew...@acm.org> ---
I looked into this a bit. It does indeed appear that LD{A}XP and ST{L}XP
exist in AArch64 8.0 but are not implemented in V. I am somewhat surprised by
this since I distinctly remember carefully making a list of all instructions
that needed to be implemented, when doing the initial AArch64 port, so I'm not
sure how these got forgotten.
I will fix it, but it may not be an immediate fix. VEX's intermediate
representation has a way to represent doubleword CAS, but can only represent
single word load-exclusive / store-check, so it will need to be extended
accordingly, and that may have some minor knock-on effect on other
architectures.
I would guess that the immediate cause of the failure is that LLVM 12 has
started generating these instructions. That would explain why rustc shows the
problem in comment 0 -- presumably that is rustc nightly -- and also why
clang++ 12 shows the problem in comment 3.
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