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From: "dhazeghi at yahoo dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/57268] New: c nested loops hang compiler
Date: Mon, 13 May 2013 22:12:00 -0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 4.9.0
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57268

            Bug ID: 57268
           Summary: c nested loops hang compiler
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dhazeghi at yahoo dot com

Created attachment 30106
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30106&action=edit
testcase

The attached testcase causes current gcc trunk to hang on
x86_64-unknown-linux-gnu, when compiled at -O2 or higher optimization levels. 
It compiles successfully with gcc 4.8.  I have not succeeded in reducing the
testcase to a manageable size.

$ gcc-trunk -v
gcc-trunk (GCC) 4.9.0 20130513 (experimental) [trunk revision 198822]
...
$ gcc-trunk -Os -w test.c
$ gcc-4.8 -O2 -w test.c
$ gcc-trunk -O2 -w test.c
<hangs>