Re: add AVX2 support to simd.h

Tom Lane <tgl@sss.pgh.pa.us>

From: Tom Lane <tgl@sss.pgh.pa.us>

To: Nathan Bossart <nathandbossart@gmail.com>

Cc: John Naylor <johncnaylorls@gmail.com>, Ants Aasma <ants@cybertec.at>, pgsql-hackers@postgresql.org

Date: 2024-03-26T23:28:24Z

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 →

Improve style of pg_lfind32().
- 7188a7806d20 17.0 landed
Fix compiler warning for pg_lfind32().
- 1f42337be535 17.0 landed
Micro-optimize pg_lfind32().
- 7644a7340c8a 17.0 landed
Introduce helper SIMD functions for small byte arrays
- 9f225e992bed 17.0 cited
Optimize xid/subxid searches in XidInMVCCSnapshot().
- 37a6e5df3713 16.0 cited

Nathan Bossart <nathandbossart@gmail.com> writes:
> I've committed v9, and I've marked the commitfest entry as "Committed,"
> although we may want to revisit AVX2, etc. in the future.

A significant fraction of the buildfarm is issuing warnings about
this.

 adder         | 2024-03-26 21:04:33 | ../pgsql/src/include/port/pg_lfind.h:199:1: warning: label 'one_by_one' defined but not used [-Wunused-label]
 buri          | 2024-03-26 21:16:09 | ../../src/include/port/pg_lfind.h:199:1: warning: label 'one_by_one' defined but not used [-Wunused-label]
 cavefish      | 2024-03-26 22:53:23 | ../../src/include/port/pg_lfind.h:199:1: warning: label 'one_by_one' defined but not used [-Wunused-label]
 cisticola     | 2024-03-26 22:20:07 | ../../../../src/include/port/pg_lfind.h:199:1: warning: label 'one_by_one' defined but not used [-Wunused-label]
 lancehead     | 2024-03-26 21:48:17 | ../../src/include/port/pg_lfind.h:199:1: warning: unused label 'one_by_one' [-Wunused-label]
 nicator       | 2024-03-26 21:08:14 | ../../src/include/port/pg_lfind.h:199:1: warning: label 'one_by_one' defined but not used [-Wunused-label]
 nuthatch      | 2024-03-26 22:00:04 | ../../src/include/port/pg_lfind.h:199:1: warning: label 'one_by_one' defined but not used [-Wunused-label]
 rinkhals      | 2024-03-26 19:51:32 | ../../src/include/port/pg_lfind.h:199:1: warning: unused label 'one_by_one' [-Wunused-label]
 siskin        | 2024-03-26 19:59:29 | ../../src/include/port/pg_lfind.h:199:1: warning: label 'one_by_one' defined but not used [-Wunused-label]

			regards, tom lane