public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "hubicka at ucw dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/32629] missing CSE for constant in registers / inefficient memset
Date: Sat, 09 Jun 2012 22:17:00 -0000	[thread overview]
Message-ID: <bug-32629-4-OAwf7ctXYp@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-32629-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32629

--- Comment #2 from Jan Hubicka <hubicka at ucw dot cz> 2012-06-09 22:17:07 UTC ---
> I suppose doing the $0x0 optimization should be done post-reload.
I was wondering how to implement this nice for some years already.... I don't
see how this can be done without specialized pass, really, and the interface is
probably going to be bit weird, since it is very weird property of x86
instruction set that there are no stores with short immediate...

Honza


  parent reply	other threads:[~2012-06-09 22:17 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <bug-32629-4@http.gcc.gnu.org/bugzilla/>
2012-06-06 10:06 ` rguenth at gcc dot gnu.org
2012-06-09 22:17 ` hubicka at ucw dot cz [this message]
2012-06-11  8:39 ` rguenther at suse dot de
2014-09-27  0:15 ` hubicka at gcc dot gnu.org
2014-09-29 10:24 ` rguenth at gcc dot gnu.org
2014-09-29 16:50 ` hubicka at ucw dot cz
2021-07-26 22:20 ` pinskia at gcc dot gnu.org

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:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

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

  git send-email \
    --in-reply-to=bug-32629-4-OAwf7ctXYp@http.gcc.gnu.org/bugzilla/ \
    --to=gcc-bugzilla@gcc.gnu.org \
    --cc=gcc-bugs@gcc.gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* 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).