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From: "bergner at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/30931]  New: Simple test case loops infinitely with -O1 -fstrength-reduce.
Date: Thu, 22 Feb 2007 22:39:00 -0000	[thread overview]
Message-ID: <bug-30931-11700@http.gcc.gnu.org/bugzilla/> (raw)

The simple test which I'll attach shortly, loops infinitely when compiled with
-O1 -fstrength-reduce and executes fine with plain -O1.  Doing a little
debugging, it seems the loop index variable "i" is not incremented within the
loop causing us to loop forever.

I have tested this using the latest FSF 4.1, 4.2 and mainline compiler sources
and it only fails using the 4.1 compiler.  Using an older 3.4.6 distro
compiler, it executes fine, so this _looks_ like a regression.


-- 
           Summary: Simple test case loops infinitely with -O1 -fstrength-
                    reduce.
           Product: gcc
           Version: 4.1.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bergner at gcc dot gnu dot org
 GCC build triplet: i686-linux
  GCC host triplet: i686-linux
GCC target triplet: i686-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30931


             reply	other threads:[~2007-02-22 22:39 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-22 22:39 bergner at gcc dot gnu dot org [this message]
2007-02-22 22:40 ` [Bug rtl-optimization/30931] " bergner at gcc dot gnu dot org
2007-02-22 23:27 ` steven at gcc dot gnu dot org
2007-02-22 23:29 ` pinskia at gcc dot gnu dot org
2007-02-22 23:32 ` bergner at gcc dot gnu dot org
2007-02-23 10:03 ` rguenth at gcc dot gnu dot org
2007-02-23 14:06 ` bergner at gcc dot gnu dot org
2007-02-23 14:13 ` [Bug rtl-optimization/30931] [4.1 Regression] " rguenth at gcc dot gnu dot org
2007-02-23 14:17 ` bergner at gcc dot gnu dot org
2007-02-23 14:17 ` bergner at gcc dot gnu dot org
2007-02-23 14:30 ` bonzini at gnu dot org
2007-02-23 14:32 ` bonzini at gnu dot org
2007-02-26 19:18 ` ebotcazou at gcc dot gnu dot org
2007-02-27 20:21 ` [Bug rtl-optimization/30931] [4.1 regression] infinite loop " ebotcazou at gcc dot gnu dot org
2007-02-27 20:23 ` ebotcazou at gcc dot gnu dot org

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