Loop vectorization that worked with `clang-19` stopped with `clang-20`. Minimal repro: https://godbolt.org/z/Yd4KjG9Yo https://godbolt.org/z/cP5jeeo5Y I bisected the regression to [this PR](https://github.com/llvm/llvm-project/pull/116073). Looks like wrapping inside `select(...)` confuses LoopVectorizer. Backreference: https://github.com/ClickHouse/ClickHouse/pull/77352#issuecomment-2852255156