joerg added a comment.

It is not true that all false positives have been fixed, some of the more 
complex cases involving nested data structures are still open.

@royger: Your example is missing explicit alignment. packed has two side 
effects: remove internal padding and set the alignment to 1. That means that 
the offset of base doesn't matter so much because reg itself is not necessarily 
aligned.


Repository:
  rL LLVM

https://reviews.llvm.org/D20561



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