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From: "panagopoulosalexandrou at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/47153] New: g++ with -O3 enters infinite loop
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47153

           Summary: g++ with -O3 enters infinite loop
           Product: gcc
           Version: 4.5.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: panagopoulosalexandrou@hotmail.com


Created attachment 22882
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22882
The program for which the bug applies.

$ x86_64-redhat-linux-g++ sudoku_solver_single.cpp -O3 -o sudoku_solver_single
$ ./sudoku_solver_single
.923.........8.1...........1.7.4...........658.........6.5.2...4.....7.....9.....

The program seems to enter an infinite loop inside solve, even though found_one
is set to true. The expected behaviour is observed when -O2 is used instead.