Re: Improve CRC32C performance on SSE4.2

John Naylor <johncnaylorls@gmail.com>

From: John Naylor <johncnaylorls@gmail.com>

To: Andy Fan <zhihuifan1213@163.com>

Cc: "Devulapalli, Raghuveer" <raghuveer.devulapalli@intel.com>, Nathan Bossart <nathandbossart@gmail.com>, Jesper Pedersen <jesperpedersen.db@gmail.com>, Tomas Vondra <tomas@vondra.me>, "pgsql-hackers@lists.postgresql.org" <pgsql-hackers@lists.postgresql.org>, "Shankaran, Akash" <akash.shankaran@intel.com>

Date: 2025-06-23T11:07:47Z

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 →

Include _mm512_zextsi128_si512() in AVX-512 configure probes.
- ccd5bc93fdfe 18.0 landed
Properly fix AVX-512 CRC calculation bug
- 43da394304fb 18.0 landed
Workaround code generation bug in clang
- f83f14881c7a 18.0 landed
Compute CRC32C using AVX-512 instructions where available
- 3c6e8c123896 18.0 landed
Inline CRC computation for small fixed-length input on x86
- e2809e3a1015 18.0 landed
Be more paranoid in configure's checks for CRC and POPCNT intrinsics.
- fdb5dd6331e3 18.0 cited

On Tue, Jun 17, 2025 at 3:55 PM John Naylor <johncnaylorls@gmail.com> wrote:
> > > Replacing that with _mm512_zextsi128_si512 fixes the problem.
>
> Here's a patch for testing, which also reverts the previous
> workaround.

Pushed, thanks everyone!

--
John Naylor
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