llvm-project

8e7461e2 - [LoadStoreVectorizer] Batch alias analysis results to improve compile time (#147555)

[LoadStoreVectorizer] Batch alias analysis results to improve compile time (#147555) This should be generally good for a lot of LSV cases, but the attached test demonstrates a specific compile time issue that appears in the event where the `CaptureTracking` default max uses is raised. Without using batching alias analysis, this test takes 6 seconds to compile in a release build. With, less than a second. This is because the mechanism that proves `NoAlias` in this case is very expensive (`CaptureTracking.cpp`), and caching the result leads to 2 calls to that mechanism instead of ~300,000 (run with -stats to see the difference) This test only demonstrates the compile time issue if `capture-tracking-max-uses-to-explore` is set to at least 1024, because with the default value of 100, the `CaptureTracking` analysis is not run, `NoAlias` is not proven, and the vectorizer gives up early.