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...W, 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") -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20170414/179ff6bf/attachment.html>

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? I noticed that TBAA is only run once, early on in the pass ordering for O1 through O3. My thinking is that if a pass that duplicates code is run, the analysis info may not have data for the result of the new load/stores. A solution might be