public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "bonzini at gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/28690] [4.2/4.3 Regression] Performace problem with indexed load/stores on powerpc
Date: Wed, 29 Nov 2006 07:56:00 -0000	[thread overview]
Message-ID: <20061129075640.3631.qmail@sourceware.org> (raw)
In-Reply-To: <bug-28690-5233@http.gcc.gnu.org/bugzilla/>



------- Comment #27 from bonzini at gnu dot org  2006-11-29 07:56 -------
This case is still not fixed:


struct s {
  int size;
  float *data;
};

void f(struct s *d, struct s *s)
{
  int i;
  for (i = 0; i < s->size; i++)
    d->data[i] += s->data[i];
}

The body of the loop is compiled to:

L4:
        slwi r2,r9,2
        addi r9,r9,1
        lfsx f0,r2,r3
        lfsx f13,r4,r2
        fadds f0,f0,f13
        stfsx f0,r2,r3
        bdnz L4

Note how r2 is twice in the first position, and once in the second.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28690


  parent reply	other threads:[~2006-11-29  7:56 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-08-11  5:01 [Bug middle-end/28690] New: " bergner at vnet dot ibm dot com
2006-08-11 13:29 ` [Bug middle-end/28690] [4.2 Regression] " dje at gcc dot gnu dot org
2006-08-11 14:34 ` dberlin at dberlin dot org
2006-08-26  3:49 ` pinskia at gcc dot gnu dot org
2006-08-26  4:24 ` bergner at vnet dot ibm dot com
2006-09-01 21:50 ` mmitchel at gcc dot gnu dot org
2006-09-03 13:51 ` bonzini at gnu dot org
2006-09-05 18:44 ` bergner at vnet dot ibm dot com
2006-09-05 19:25 ` bonzini at gnu dot org
2006-09-05 20:01 ` bergner at vnet dot ibm dot com
2006-09-07  5:14 ` bergner at vnet dot ibm dot com
2006-09-21 18:14 ` bergner at vnet dot ibm dot com
2006-09-21 18:16 ` bergner at vnet dot ibm dot com
2006-09-21 18:19 ` bergner at vnet dot ibm dot com
2006-09-22 16:30 ` bergner at vnet dot ibm dot com
2006-09-22 16:56 ` bergner at vnet dot ibm dot com
2006-09-22 17:05 ` pinskia at gcc dot gnu dot org
2006-09-22 17:09   ` Andrew Pinski
2006-09-22 17:09 ` pinskia at physics dot uc dot edu
2006-09-22 17:27 ` sabre at nondot dot org
2006-10-03  3:30 ` bergner at vnet dot ibm dot com
2006-10-03  5:21 ` paolo dot bonzini at lu dot unisi dot ch
2006-10-03 15:52 ` bergner at vnet dot ibm dot com
2006-10-03 17:58 ` dje at gcc dot gnu dot org
2006-10-03 18:11 ` bonzini at gnu dot org
2006-10-03 18:11 ` dje at watson dot ibm dot com
2006-10-12 17:23 ` janis at gcc dot gnu dot org
2006-11-08  3:30 ` [Bug middle-end/28690] [4.2/4.3 " bergner at vnet dot ibm dot com
2006-11-08  3:35 ` pinskia at gcc dot gnu dot org
2006-11-20 20:22 ` bergner at vnet dot ibm dot com
2006-11-29  7:56 ` bonzini at gnu dot org [this message]
2006-11-29 20:11 ` bergner at vnet dot ibm dot com
2006-11-29 22:24 ` bergner at vnet dot ibm dot com
2006-12-05  4:22 ` bergner at vnet dot ibm dot com
2006-12-05  4:42 ` bergner at vnet dot ibm dot com
2006-12-05 16:12 ` pthaugen at us dot ibm dot com
2006-12-05 16:30 ` pthaugen at us dot ibm dot com
2007-01-17 20:58 ` bergner at gcc dot gnu dot org
2007-02-12 17:30 ` bergner at gcc dot gnu dot org
2007-02-23 17:14 ` bergner at gcc dot gnu dot org
2007-05-14 21:28 ` mmitchel at gcc dot gnu dot org
2007-06-09  4:08 ` bergner at gcc dot gnu dot org
2007-07-20  3:50 ` mmitchel at gcc dot gnu dot org
2007-08-06  8:09 ` bonzini at gnu dot org
2007-08-06 11:35 ` pinskia at gcc dot gnu dot org
2007-08-06 11:52 ` paolo dot bonzini at lu dot unisi dot ch
2007-10-09 19:26 ` mmitchel at gcc dot gnu dot org
2007-11-10 17:05 ` steven at gcc dot gnu dot org
2008-01-07 18:07 ` steven at gcc dot gnu dot org
2008-01-08 16:09 ` bergner at gcc dot gnu dot org
2008-01-08 16:12 ` [Bug middle-end/28690] [4.2 " steven at gcc dot gnu dot org
2008-01-16  5:32 ` bergner at gcc dot gnu dot org
2008-04-08  6:40 ` ubizjak at gmail dot com
2008-04-08  6:43 ` ubizjak at gmail dot com
2008-04-08 14:50 ` bergner at gcc dot gnu dot org
2008-04-08 15:01 ` bonzini at gnu dot org
2008-04-08 18:51 ` bergner at gcc dot gnu dot org
2008-04-08 19:08 ` bonzini at gnu dot org
2008-04-09 15:39 ` bergner at gcc dot gnu dot 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=20061129075640.3631.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).