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: 2024-03-27T01:48:57Z

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:
> On Tue, Mar 26, 2024 at 06:55:54PM -0500, Nathan Bossart wrote:
>> On Tue, Mar 26, 2024 at 07:28:24PM -0400, Tom Lane wrote:
>>> A significant fraction of the buildfarm is issuing warnings about
>>> this.

> Done.  I'll keep an eye on the farm.

Thanks.

> I just did the minimal fix for now, i.e., I moved the new label into the
> SIMD section of the function.  I think it would be better stylistically to
> move the one-by-one logic to an inline helper function, but I didn't do
> that just in case it might negatively impact performance.  I'll look into
> this and will follow up with another patch if it looks good.

Sounds like a plan.

			regards, tom lane