[PATCH] SVE popcount support

Malladi, Rama <rvmallad@amazon.com>

From: "Malladi, Rama" <rvmallad@amazon.com>

To: "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>

Cc: "Dipietro, Salvatore" <dipiets@amazon.co.uk>, "nathandbossart@gmail.com" <nathandbossart@gmail.com>, "Malladi, Rama" <rvmallad@amazon.com>

Date: 2024-11-27T15:43:27Z

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 →

Optimize popcount functions with ARM SVE intrinsics.
- 519338ace410 18.0 landed
Optimize popcount functions with ARM Neon intrinsics.
- 6be53c27673a 18.0 landed
Rename TRY_POPCNT_FAST to TRY_POPCNT_X86_64.
- 9ac6f7e7ceb6 18.0 landed

Attachments protected by Amazon:

[0001-SVE-popcount-support.patch]
https://us-west-2.secure-attach.amazon.com/a29c9ff9-1f9b-430f-9b3c-07fde9a419aa/f9178627-0600-4527-bc5c-7e4cb9ef6e9a
[SVE-popcount-support-PostgreSQL.png]
https://us-west-2.secure-attach.amazon.com/a29c9ff9-1f9b-430f-9b3c-07fde9a419aa/13c252c4-c45e-447c-9e55-fe637f8d345c

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Please find attached a patch to PostgreSQL implementing SVE popcount. I used John Naylor's test_popcount module [0] to put together the attached graphs. This test didn't show any regressions with a relatively small number of bytes, and it showed the expected improvements with many bytes.

[0] https://postgr.es/m/CAFBsxsE7otwnfA36Ly44zZO+b7AEWHRFANxR1h1kxveEV=ghLQ@mail.gmail.com