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: "Devanga.Susmitha@fujitsu.com" <Devanga.Susmitha@fujitsu.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>, "Ragesh.Hajela@fujitsu.com" <Ragesh.Hajela@fujitsu.com>
Date: 2025-01-10T15:38:14Z
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 Fri, Jan 10, 2025 at 11:10:03AM +0000, Chiranmoy.Bhattacharya@fujitsu.com wrote:
> We tried auto-vectorization and observed no performance improvement.

Do you mean that the auto-vectorization worked and you observed no
performance improvement, or the auto-vectorization had no effect on the
code generated?

> The instructions in src/include/port/simd.h are based on older SIMD
> architectures like NEON, whereas the patch uses the newer SVE, so some of
> the instructions used in the patch may not have direct equivalents in
> NEON. We will check the feasibility of integrating SVE in
> "src/include/port/simd.h" and get back to you.

Thanks!

-- 
nathan