public inbox for
 help / color / mirror / Atom feed
From: Jan Beulich <>
To: Hongtao Liu <>
Cc: "" <>,
	Kirill Yukhin <>,
	Hongtao Liu <>
Subject: Re: [PATCH v2] x86: make better use of VBROADCASTSS / VPBROADCASTD
Date: Wed, 21 Jun 2023 14:39:46 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 21.06.2023 09:44, Jan Beulich wrote:
> On 21.06.2023 09:37, Hongtao Liu wrote:
>> On Wed, Jun 21, 2023 at 2:06 PM Jan Beulich via Gcc-patches
>> <> wrote:
>>> Isn't prefix_extra use bogus here? What extra prefix does vbroadcastss
>> According to comments, yes, no extra prefix is needed.
>> ;; There are also additional prefixes in 3DNOW, SSSE3.
>> ;; ssemuladd,sse4arg default to 0f24/0f25 and DREX byte,
>> ;; sseiadd1,ssecvt1 to 0f7a with no DREX byte.
>> ;; 3DNOW has 0f0f prefix, SSSE3 and SSE4_{1,2} 0f38/0f3a.
> Right, that's what triggered my question. I guess dropping these
> "prefix_extra" really wants to be a separate patch (or maybe even
> multiple, but it's hard to see how to split), dealing with all of the
> instances which likely have accumulated simply via copy-and-paste.

Or wait - I'm altering those lines anyway, so I could as well drop
them right away (and slightly shrink patch size), if that's okay with
you. Of course I should then not forget to also mention this in the
changelog entry.


  reply	other threads:[~2023-06-21 12:39 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-06-21  6:06 Jan Beulich
2023-06-21  7:37 ` Hongtao Liu
2023-06-21  7:44   ` Jan Beulich
2023-06-21 12:39     ` Jan Beulich [this message]
2023-06-25  1:17       ` Liu, Hongtao
2023-06-25  1:23         ` Hongtao Liu

Reply instructions:

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

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

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).