Re: centralize CPU feature detection

Zsolt Parragi <zsolt.parragi@percona.com>

From: Zsolt Parragi <zsolt.parragi@percona.com>

To: John Naylor <johncnaylorls@gmail.com>

Cc: Tom Lane <tgl@sss.pgh.pa.us>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, root <tenistarkim@gmail.com>, Nathan Bossart <nathandbossart@gmail.com>

Date: 2026-02-25T13:09:21Z

Lists: pgsql-hackers

Both look good to me.

This isn't part of the patch, and it seems harmless, but while
reviewing the CRC functions, I noticed that pg_crc32c.h  is
inconsistent with its dllimport markers, pg_comp_crc32c has 3
different declarations, and only 1 of them is marked PGDLLIMPORT.

Commits

Remove extraneous PGDLLIMPORT
- ec5981c3816e 19 (unreleased) landed
Refactor detection of x86 ZMM registers
- 51bb4a58ed23 19 (unreleased) landed
Centralize detection of x86 CPU features
- 16743db061e4 19 (unreleased) landed
Fix USE_SLICING_BY_8_CRC32C builds on x86
- 3322f01a11b7 19 (unreleased) landed
Rename pg_crc32c_sse42_choose.c for general purpose
- b9278871f991 19 (unreleased) landed