public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "krebbel at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/46238] New: s390x bootstrap problem: wrong code generated due to crossjumping
Date: Sat, 30 Oct 2010 07:37:00 -0000	[thread overview]
Message-ID: <bug-46238-4@http.gcc.gnu.org/bugzilla/> (raw)

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46238

           Summary: s390x bootstrap problem: wrong code generated due to
                    crossjumping
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: krebbel@gcc.gnu.org


collect2 gets miscompiled due to a bug in cfgcleanup.

try_head_merge_bb moves an insn setting r2 over an insn clobbering that
register. DCE removes the set afterwards. try_head_merge_bb doesn't notice due
to wrong live info in the 'live_union' variable.

Proposed fix:
http://gcc.gnu.org/ml/gcc-patches/2010-10/msg02569.html


             reply	other threads:[~2010-10-30  7:37 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-30  7:37 krebbel at gcc dot gnu.org [this message]
2010-10-30  7:38 ` [Bug rtl-optimization/46238] " krebbel at gcc dot gnu.org
2010-11-03 12:37 ` [Bug rtl-optimization/46238] s390x bootstrap problem: wrong code generated in cfgcleanup/crossjumping krebbel at gcc dot gnu.org
2010-11-03 17:10 ` hjl.tools at gmail dot com
2010-11-03 18:32 ` [Bug rtl-optimization/46238] [4.6 Regression] " pinskia at gcc dot gnu.org
2010-11-04  8:47 ` krebbel at gcc dot gnu.org
2010-11-04 16:06 ` krebbel at gcc dot gnu.org
2010-11-05 12:30 ` jakub 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-46238-4@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).