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The pass analysis uses "sets" implemented using a SmallVector type to keep track of Used, Preserved, Required and RequiredTransitive passes. When having nested analyses we could end up with duplicates in those sets, as there was no checks to see if a pass already existed in the "set" before pushing to the vectors. This idea with this patch is to avoid such duplicates by avoiding pushing elements that already is contained when adding elements to those sets. To align with the above PMDataManager::collectRequiredAndUsedAnalyses is changed to skip adding both the Required and RequiredTransitive passes to its result vectors (since RequiredTransitive always is a subset of Required we ended up with duplicates when traversing both sets). Main goal with this is to avoid spending time verifying the same analysis mulitple times in PMDataManager::verifyPreservedAnalysis when iterating over the Preserved "set". It is assumed that removing duplicates from a "set" shouldn't have any other negative impact (I have not seen any problems so far). If this ends up causing problems one could do some uniqueness filtering of the vector being traversed in verifyPreservedAnalysis instead. Reviewed By: foad Differential Revision: https://reviews.llvm.org/D94416 |
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