Horton

RE: Improve CRC32C performance on SSE4.2

Devulapalli, Raghuveer <raghuveer.devulapalli@intel.com>

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From: "Devulapalli, Raghuveer" <raghuveer.devulapalli@intel.com>
To: "Devulapalli, Raghuveer" <raghuveer.devulapalli@intel.com>, Andy Fan <zhihuifan1213@163.com>
Cc: Nathan Bossart <nathandbossart@gmail.com>, John Naylor <johncnaylorls@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: 2025-06-17T04:27:53Z
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.

Attachments

Let me know if this fixes the failure. This is technically not a compiler bug.

> -----Original Message-----
> From: Devulapalli, Raghuveer <raghuveer.devulapalli@intel.com>
> Sent: Monday, June 16, 2025 4:53 PM
> To: Andy Fan <zhihuifan1213@163.com>
> Cc: Nathan Bossart <nathandbossart@gmail.com>; John Naylor
> <johncnaylorls@gmail.com>; Jesper Pedersen <jesperpedersen.db@gmail.com>;
> Tomas Vondra <tomas@vondra.me>; pgsql-hackers@lists.postgresql.org;
> Shankaran, Akash <akash.shankaran@intel.com>
> Subject: RE: Improve CRC32C performance on SSE4.2
> 
> > Just be curious, what kind of optimization (like what -O2 does) could
> > mask this issue?
> 
> >= -O1. Only -O0 shows this problem.
> 
> Raghuveer
> 
>