Horton

Re: [PATCH] Hex-coding optimizations using SVE on ARM.

Nathan Bossart <nathandbossart@gmail.com>

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From: Nathan Bossart <nathandbossart@gmail.com>
To: "Chiranmoy.Bhattacharya@fujitsu.com" <Chiranmoy.Bhattacharya@fujitsu.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, David Rowley <dgrowleyml@gmail.com>, John Naylor <johncnaylorls@gmail.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>, "Devanga.Susmitha@fujitsu.com" <Devanga.Susmitha@fujitsu.com>, "Ragesh.Hajela@fujitsu.com" <Ragesh.Hajela@fujitsu.com>
Date: 2025-09-03T14:48:57Z
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 →

  1. Optimize hex_encode() and hex_decode() using SIMD.

  2. Speed up hex_encode with bytewise lookup

On Wed, Sep 03, 2025 at 11:11:24AM +0000, Chiranmoy.Bhattacharya@fujitsu.com wrote:
> Since the CommitFest is underway, could we get some feedback to improve
> the patch?

I see that there was some discussion about a Neon implementation upthread,
but I'm not sure we concluded anything.  For popcount, we first added a
Neon version before adding the SVE version, which required more complicated
configure/runtime checks.  Presumably Neon is available on more hardware
than SVE, so that could be a good place to start here, too.

Also, I'd strongly encourage you to get involved with others' patches on
the mailing lists (e.g., reviewing, testing).  Patch submissions are great,
but this community depends on other types of participation, too.  IME
helping others with their patches also tends to incentivize others to help
with yours.

-- 
nathan