Re: add AVX2 support to simd.h

Nathan Bossart <nathandbossart@gmail.com>

From: Nathan Bossart <nathandbossart@gmail.com>

To: John Naylor <johncnaylorls@gmail.com>

Cc: Ants Aasma <ants@cybertec.at>, pgsql-hackers@postgresql.org

Date: 2024-03-21T17:12:22Z

Lists: pgsql-hackers

Commits

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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

On Thu, Mar 21, 2024 at 12:09:44PM -0500, Nathan Bossart wrote:
> It does still eventually win, although not nearly to the same extent as
> before.  I extended the benchmark a bit to show this.  I wouldn't be
> devastated if we only got 0001 committed for v17, given these results.

(In case it isn't clear from the graph, after 128 elements, I only tested
at 200, 300, 400, etc. elements.)

-- 
Nathan Bossart
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