public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "chip at pobox dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/54585] stack space allocated but never used when calling functions that return structs in registers
Date: Mon, 23 Sep 2013 20:05:00 -0000	[thread overview]
Message-ID: <bug-54585-4-oeWQw5ZiUb@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-54585-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54585

--- Comment #3 from Chip Salzenberg <chip at pobox dot com> ---
It's worth it for cache reasons I believe.  The data cache works better you
don't spread out the stack data unnecessarily.  More concretely, if the stack
frame can entirely disappear then you also reduce the instruction count. 
That's fewer instructions to dispatch and less icache pressure.


  parent reply	other threads:[~2013-09-23 20:05 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-14 21:11 [Bug rtl-optimization/54585] New: " chip at pobox dot com
2013-09-05 20:06 ` [Bug rtl-optimization/54585] " chip at pobox dot com
2013-09-05 21:05 ` ebotcazou at gcc dot gnu.org
2013-09-23 20:05 ` chip at pobox dot com [this message]
2021-12-18 23:59 ` [Bug middle-end/54585] " 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-54585-4-oeWQw5ZiUb@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).