Does this ordering of instructions makes sense?

Does this ordering of instructions makes sense?

I have question from 

http://cs.nyu.edu/courses/fall13/CSCI-GA.3033-010/How_to_Survive_the_Multicore_Software_Revolution.pdf

Please see the image below or click the following url for the question. Looking forward to your answer

http://imageshack.us/photo/my-images/33/u495.jpg/

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