pg.ddx.io  pgsql-hackers@postgresql.org mailing list archive  

help / color / mirror / Atom feed
From: Nathan Bossart <nathandbossart@gmail.com>
To: John Naylor <johncnaylorls@gmail.com>
Cc: Ants Aasma <ants@cybertec.at>
Cc: pgsql-hackers@postgresql.org
Subject: Re: add AVX2 support to simd.h
Date: Mon, 25 Mar 2024 10:21:21 -0500
Message-ID: <20240325152121.GB2662364@nathanxps13> (raw)
In-Reply-To: <CANWCAZb7TGEk6ib12Rr6pbGMy9pqofT0dS=8Dkm+=MwJQZAEww@mail.gmail.com>
References: <CANWCAZbY8fxmz6TRXmPz_s1VOZQQgTkfvayaXvWbqQnq2D849g@mail.gmail.com>
	<20240319031601.GA828141@nathanxps13>
	<CANWCAZafKPUBYdNdtqZLVxVJhSn-ONeo_tp1FsODcn7udjKwRQ@mail.gmail.com>
	<20240319163033.GA952199@nathanxps13>
	<CANWCAZbphuJTDjusRBGWk1R-z8Z-kvjMjsC5X4A6rjTN54MOFw@mail.gmail.com>
	<20240320143116.GA1313857@nathanxps13>
	<20240320195513.GA1618413@nathanxps13>
	<CANWCAZYfUv3iN2Vx--tmQP9WU6xwfU8d=gA7LoFXOYP9-wo8Hg@mail.gmail.com>
	<20240321170944.GA1767527@nathanxps13>
	<CANWCAZb7TGEk6ib12Rr6pbGMy9pqofT0dS=8Dkm+=MwJQZAEww@mail.gmail.com>

On Mon, Mar 25, 2024 at 10:03:27AM +0700, John Naylor wrote:
> Seems pretty good. It'd be good to see the results of 2- vs.
> 4-register before committing, because that might lead to some
> restructuring, but maybe it won't, and v8 is already an improvement
> over HEAD.

I tested this the other day [0] (only for x86).  The results seemed to
indicate that the 4-register approach was still quite a bit better.

> /* Process the remaining elements one at a time. */
> 
> This now does all of them if that path is taken, so "remaining" can be removed.

Right, will do.

[0] https://postgr.es/m/20240321183823.GA1800896%40nathanxps13

-- 
Nathan Bossart
Amazon Web Services: https://aws.amazon.com





view thread (48+ messages)  latest in thread

Message-ID: <20240325152121.GB2662364@nathanxps13>
Permalink:  ../20240325152121.GB2662364@nathanxps13/
Also on:    postgresql.org/message-id/20240325152121.GB2662364@nathanxps13

 · 

reply
Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: pgsql-hackers@postgresql.org
  Cc: nathandbossart@gmail.com, johncnaylorls@gmail.com, ants@cybertec.at
  Subject: Re: add AVX2 support to simd.h
  In-Reply-To: <20240325152121.GB2662364@nathanxps13>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox