RE: Improve CRC32C performance on SSE4.2

From: "Devulapalli, Raghuveer" <raghuveer(dot)devulapalli(at)intel(dot)com>
To: John Naylor <johncnaylorls(at)gmail(dot)com>, Nathan Bossart <nathandbossart(at)gmail(dot)com>
Cc: "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, "Shankaran, Akash" <akash(dot)shankaran(at)intel(dot)com>
Subject: RE: Improve CRC32C performance on SSE4.2
Date: 2025-03-11 20:57:17
Message-ID: PH8PR11MB8286C653FD6629E0862FA07FFBD12@PH8PR11MB8286.namprd11.prod.outlook.com
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> I've gone ahead and added the generated AVX-512 algorithm in v14-0005

+ pg_attribute_target("avx512vl,vpclmulqdq")
+ pg_crc32c
+ pg_comp_crc32c_pclmul(pg_crc32c crc, const void *data, size_t length)

I'm a little confused. Why is v14 missing the earlier versions of pclmul implementation that works without avx-512?

Raghuveer

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