public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/42614] [4.4 Regression] FRE optimizes away valid code after IPA inlining
Date: Tue, 05 Jan 2010 12:17:00 -0000	[thread overview]
Message-ID: <20100105121655.23353.qmail@sourceware.org> (raw)
In-Reply-To: <bug-42614-17160@http.gcc.gnu.org/bugzilla/>



------- Comment #9 from rguenth at gcc dot gnu dot org  2010-01-05 12:16 -------
Ok, it's simple.  We add false aliases to &index to both SMTs of SEntry and
STable because may_alias_p (SEntry, char) returns true as every alias-set
is a subset of alias-set zero.

But then when coming along to adding SMT aliases we do not add STable as
an alias of SEntry because they already have (false) aliases in common.
These false aliases are pruned by access_can_touch_variable later and
boom - there we go.

I have a fix.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42614


  parent reply	other threads:[~2010-01-05 12:17 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-01-04 18:24 [Bug tree-optimization/42614] New: " rahul at icerasemi dot com
2010-01-04 19:34 ` [Bug tree-optimization/42614] " rguenth at gcc dot gnu dot org
2010-01-05 11:14 ` stubbs at icerasemi dot com
2010-01-05 11:31 ` [Bug tree-optimization/42614] [4.4 Regression] " rguenth at gcc dot gnu dot org
2010-01-05 11:31 ` [Bug tree-optimization/42614] " rahul at icerasemi dot com
2010-01-05 11:39 ` [Bug tree-optimization/42614] [4.4 Regression] " rguenth at gcc dot gnu dot org
2010-01-05 11:42 ` stubbs at icerasemi dot com
2010-01-05 11:57 ` rguenth at gcc dot gnu dot org
2010-01-05 11:58 ` rguenth at gcc dot gnu dot org
2010-01-05 12:17 ` rguenth at gcc dot gnu dot org [this message]
2010-01-05 12:20 ` rguenth at gcc dot gnu dot org
2010-01-05 12:23 ` stubbs at icerasemi dot com
2010-01-05 12:32 ` stubbs at icerasemi dot com
2010-01-05 13:42 ` rguenth at gcc dot gnu dot org
2010-01-05 13:43 ` rguenth at gcc dot gnu dot org
2010-01-05 13:43 ` rguenth at gcc dot gnu dot org
2010-01-19 10:39 ` rguenth 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=20100105121655.23353.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).