[Bug c++/51962] Compiling with -O3 and using the same input produces a different result

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51962

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-01-23 
11:33:39 UTC ---
It was very easy to find using valgrind, or a static analysis tool.