Xuanji Li <xua...@gmail.com> added the comment:

fwiw I've always found this helpful for undefined behavior: 
http://blog.regehr.org/archives/213 and, just as it says "x+1 > x" will be 
optimized to a nop, by the same logic "v >= &array[0] && v < &array[array_len]" 
will also be optimized to a nop.

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nosy: +xuanji

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