[llvm-dev] TBAA falsely reporting may alias? (original) (raw)

Kavon Farvardin via llvm-dev llvm-dev at lists.llvm.org
Mon Apr 17 03:08:28 PDT 2017

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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