C++ : Is this a Visual Studio 2013 update 4 C++ optimizer bug or is my code wrong?

C++ : Is this a Visual Studio 2013 update 4 C++ optimizer bug or is my code wrong?
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C++ : Is this a Visual Studio 2013 update 4 C++ optimizer bug or is my code wrong?
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update code Is is 4 C++ C++ optimizer wrong? Studio this or : a bug my Visual 2013