public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "lucier at math dot purdue dot edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug regression/39914] [4.4/4.5 Regression] 96% performance regression in floating point code; part of the problem started 2009/03/12-13
Date: Mon, 27 Apr 2009 20:38:00 -0000	[thread overview]
Message-ID: <20090427203758.32548.qmail@sourceware.org> (raw)
In-Reply-To: <bug-39914-271@http.gcc.gnu.org/bugzilla/>



------- Comment #11 from lucier at math dot purdue dot edu  2009-04-27 20:37 -------
As far as I can tell, the patch proposed by Uros restores the performance of
code generated by

gcc version 4.4.0 20090312 (experimental) [trunk revision 144812] (GCC) 

In particular, the assembly code for the main loop is identical for code
generated by

gcc version 4.4.0 20090312 (experimental) [trunk revision 144801] (GCC) 

and by

gcc version 4.4.0 20090312 (experimental) [trunk revision 144812] (GCC) 

after his patch.

Thanks for getting to this so quickly.

Brad


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39914


  parent reply	other threads:[~2009-04-27 20:38 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-04-26 18:24 [Bug regression/39914] New: " lucier at math dot purdue dot edu
2009-04-26 18:43 ` [Bug regression/39914] " ubizjak at gmail dot com
2009-04-27  8:16 ` ubizjak at gmail dot com
2009-04-27 15:07 ` lucier at math dot purdue dot edu
2009-04-27 15:11 ` lucier at math dot purdue dot edu
2009-04-27 15:26 ` pinskia at gcc dot gnu dot org
2009-04-27 15:32 ` lucier at math dot purdue dot edu
2009-04-27 15:35 ` lucier at math dot purdue dot edu
2009-04-27 16:29 ` lucier at math dot purdue dot edu
2009-04-27 18:21 ` ubizjak at gmail dot com
2009-04-27 19:04 ` [Bug regression/39914] [4.4/4.5 Regression] " bonzini at gnu dot org
2009-04-27 20:38 ` lucier at math dot purdue dot edu [this message]
2009-04-28  1:40 ` lucier at math dot purdue dot edu
2009-04-28 16:18 ` uros at gcc dot gnu dot org
2009-04-28 16:19 ` [Bug rtl-optimization/39914] [4.4 " ubizjak at gmail dot com
2009-05-03 19:40 ` uros at gcc dot gnu dot org
2009-05-03 19:41 ` ubizjak at gmail dot com

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=20090427203758.32548.qmail@sourceware.org \
    --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).