| From: | Alexander Korotkov <aekorotkov(at)gmail(dot)com> |
|---|---|
| To: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: AArch64 has single-copy 64 bit atomicity |
| Date: | 2021-11-03 00:49:29 |
| Message-ID: | CAPpHfduvu98J0Pux6Ob-T62r6aB34XneJqCrDZBDDt7BgOg1Lg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Nov 3, 2021 at 1:34 AM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
> Andres mentioned in passing that he'd defined
> PG_HAVE_8BYTE_SINGLE_COPY_ATOMICITY only on Itanium, PPC and x86 but
> not ARM.
>
> I took a look at https://developer.arm.com/documentation/ddi0487/gb/
> under "B2.2.1 Requirements for single-copy atomicity" and it seemed
> like we should turn this on for __aarch64__. It goes back to the
> original ARMv8-A so should cover all 64 bit ARM systems.
That should be very good because ARM gains popularity and the effect
of atomic read is significant
------
Regards,
Alexander Korotkov
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