RFC: linux-aarch64 and LSE support

[Andrew Haley]

On 9/23/22 12:40, dean.long at oracle.com wrote:
> I have to admit it is a bit surprising and counter-intuitive to me to
> not treat the CASAL as atomic.  If the memory model allows the 2nd store
> to be moved "inside" the CASAL, then that means it might be impossible
> to provide a total order of the AArch64 instructions that reproduces the
> observed memory effects, and that makes me wonder if it would break
> tools like "rr".

Is that an "all the world's an x86" kind of intuition, though? We're
all influenced more than we know by our history. Even Aleksey was
surprised by
https://twitter.com/shipilev/status/1400154160918581248
in which AArch64 produces "Interesting  Whoa".

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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