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From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/23657] [4.1 Regression] Wrong code generated: too much optimized out
Date: Wed, 31 Aug 2005 16:23:00 -0000	[thread overview]
Message-ID: <20050831161942.12176.qmail@sourceware.org> (raw)
In-Reply-To: <20050831160521.23657.qrczak@knm.org.pl>


------- Additional Comments From pinskia at gcc dot gnu dot org  2005-08-31 16:19 -------
Confirmed, between t41.copyrename2 and t42.dom2, the V_MAY_DEF is removed.
After
  *next_8 = 7;

Before:
  #   TMT.51_18 = V_MAY_DEF <TMT.51_4>;
  *dest_2 = 7;

I think we are forgetting to copy the alias info.
I think this is fixed by the patch for PR 23509:
http://gcc.gnu.org/ml/gcc-patches/2005-08/msg01647.html

The tree-cfg.c part that is.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
          Component|c                           |tree-optimization
     Ever Confirmed|                            |1
  GCC build triplet|i686-pc-linux-gnu           |
   GCC host triplet|i686-pc-linux-gnu           |
 GCC target triplet|i686-pc-linux-gnu           |
           Keywords|                            |alias, wrong-code
   Last reconfirmed|0000-00-00 00:00:00         |2005-08-31 16:19:38
               date|                            |
            Summary|Wrong code generated: too   |[4.1 Regression] Wrong code
                   |much optimized out          |generated: too much
                   |                            |optimized out
   Target Milestone|---                         |4.1.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23657


  reply	other threads:[~2005-08-31 16:19 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-08-31 16:05 [Bug c/23657] New: " qrczak at knm dot org dot pl
2005-08-31 16:23 ` pinskia at gcc dot gnu dot org [this message]
2005-08-31 22:14 ` [Bug tree-optimization/23657] [4.1 Regression] " qrczak at knm dot org dot pl
2005-08-31 22:23 ` pinskia at gcc dot gnu dot org
2005-08-31 22:23 ` qrczak at knm dot org dot pl

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