[llvm-commits] [pr12979][patch/rfc] Clear nsw/nuw in gvn

[Rafael Espíndola]

>> * Two loads from different languages: They cannot alias, so there is
>> no ancestor and we will simply drop the tbaa.
>
> This is not what the LLVM assembly guide says, as i quoted ;)
> It says loads in two different tbaa trees are considered to alias.

Sorry, I somehow flipped the meaning in my head. A load from two
different languages cannot share a node in the tbaa tree, so they are
assumed to alias. If merging two loads from different languages we
will correctly drop the tbaa metadata.

Cheers,
Rafael