| From: | John Naylor <johncnaylorls(at)gmail(dot)com> |
|---|---|
| To: | "Devulapalli, Raghuveer" <raghuveer(dot)devulapalli(at)intel(dot)com> |
| Cc: | Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Nathan Bossart <nathandbossart(at)gmail(dot)com>, Xiang Gao <Xiang(dot)Gao(at)arm(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: CRC32C Parallel Computation Optimization on ARM |
| Date: | 2025-03-11 01:30:30 |
| Message-ID: | CANWCAZbr=A7JjkM=rxeJoxLjML+-jq6tBTPGvfw138f68C7Xtg@mail.gmail.com |
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On Tue, Mar 11, 2025 at 3:36 AM Devulapalli, Raghuveer
<raghuveer(dot)devulapalli(at)intel(dot)com> wrote:
>
> Hi John,
>
> > On the other hand, looking at Linux kernel sources, it seems a patch using this
> > technique was contributed by Intel over a decade ago:
> >
> > https://github.com/torvalds/linux/blob/master/arch/x86/crypto/crc32c-pcl-intel-
> > asm_64.S
> >
> > So one more thing to ask our friends at Intel.
>
> Intel has contributed SSE4.2 CRC32C [1] and AVX-512 CRC32C [2] based on similar techniques to postgres.
>
> [1] https://www.postgresql.org/message-id/PH8PR11MB8286F844321BA1DEEC518348FBFD2@PH8PR11MB8286.namprd11.prod.outlook.com
> [2] https://www.postgresql.org/message-id/BL1PR11MB530401FA7E9B1CA432CF9DC3DC192@BL1PR11MB5304.namprd11.prod.outlook.com
No, these are not similar at all. I gave you the paper name and the
patents cited therein here:
--
John Naylor
Amazon Web Services
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