Horton

Re: Improve CRC32C performance on SSE4.2

Tomas Vondra <tomas@vondra.me>

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From: Tomas Vondra <tomas@vondra.me>
To: Andy Fan <zhihuifan1213@163.com>, John Naylor <johncnaylorls@gmail.com>
Cc: Nathan Bossart <nathandbossart@gmail.com>, "Devulapalli, Raghuveer" <raghuveer.devulapalli@intel.com>, "pgsql-hackers@lists.postgresql.org" <pgsql-hackers@lists.postgresql.org>, "Shankaran, Akash" <akash.shankaran@intel.com>
Date: 2025-06-14T13:47:33Z
Lists: pgsql-hackers

Commits

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  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.

Hi,

I suggest you try with a newer gcc, perhaps 13.4. There's been a bunch
of fixes related to AVX512 since 13.0, chances are this was already
fixed. I don't see this failure on 14.3.1.

T.

On 6/14/25 12:24, Andy Fan wrote:
> Hi,
> 
> Recently I always get below error during initdb.
> 
> """
> UTC [1358059] FATAL:  incorrect checksum in control file
> """
> 
> the command is "initdb -D tmp". git bisect show me the related commit is 
> 3c6e8c123896584f1be1fe69aaf68dcb5eb094d5. After revert this commit on
> the current master, everything is fine.  Does anyone knows the reason?
> 
> The attached is my config.log.
> 
> 
> 

-- 
Tomas Vondra