Horton

Re: Improve CRC32C performance on SSE4.2

John Naylor <johncnaylorls@gmail.com>

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From: John Naylor <johncnaylorls@gmail.com>
To: Andy Fan <zhihuifan1213@163.com>
Cc: Jesper Pedersen <jesperpedersen.db@gmail.com>, Nathan Bossart <nathandbossart@gmail.com>, Tomas Vondra <tomas@vondra.me>, "Devulapalli, Raghuveer" <raghuveer.devulapalli@intel.com>, "pgsql-hackers@lists.postgresql.org" <pgsql-hackers@lists.postgresql.org>, "Shankaran, Akash" <akash.shankaran@intel.com>
Date: 2025-06-16T02:39:11Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Include _mm512_zextsi128_si512() in AVX-512 configure probes.

  2. Properly fix AVX-512 CRC calculation bug

  3. Workaround code generation bug in clang

  4. Compute CRC32C using AVX-512 instructions where available

  5. Inline CRC computation for small fixed-length input on x86

  6. Be more paranoid in configure's checks for CRC and POPCNT intrinsics.

On Sun, Jun 15, 2025 at 8:32 AM Andy Fan <zhihuifan1213@163.com> wrote:
>
> Jesper Pedersen <jesperpedersen.db@gmail.com> writes:
>
> Hi,
>
> Thank you Nathan, Tomas and Jesper for the answers. The patch at [0]
> works for me and I could work with master smoothly now.

Pushed, thanks for testing! I'll do some more testing to see what
versions/levels are affected and file a bug report, but it'll be a few
days before I get to it.

-- 
John Naylor
Amazon Web Services