zaks.anna added a comment.

> Maybe, I should add a check that `a, b, n' are positive.

>  So, in this case static analyzer can choose to be strict and reject false 
> positives.


What would this buy us? Does the checker warn on underflow?

> If a' might overflow, then in this case we can emit warning stating that the 
> overflow is caused because a' might overflow.


I see your point now! I think we should improve the diagnostic that is produced 
in this case!


http://reviews.llvm.org/D9924



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