[llvm-dev] TBAA falsely reporting may alias?

[Kavon Farvardin via llvm-dev]

By "dropped" do you mean that the metadata is not propagated/preserved during the transformation?

If anyone knows which passes in particular are doing this, I would be happy to try to come up with a patch!

~kavon

> On Apr 14, 2017, at 3:52 PM, Daniel Berlin <dberlin at dberlin.org> wrote:
> 
> 
> 
> On Fri, Apr 14, 2017 at 6:12 AM, Hal Finkel via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
> 
> On 04/14/2017 08:03 AM, Kavon Farvardin via llvm-dev wrote:
> Thanks for the explanation Sanjoy!
> 
> Another question I have is: are there are any passes that invalidate or make the TBAA analysis information less precise?
> 
> Some transformation drop TBAA information when they might invalidate it, but it should be preserved in most places.
> 
> 
> FWIW, I believe some folks at Google in a different group have come to the conclusion it is dropped in about 20-30% of cases.
> (I said "file bugs") 
> 

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