| Issue |
139050
|
| Summary |
Missing masked loop vectorization due to optimization in InstrCombine
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
thevar1able
|
Loop vectorization that worked on `clang-19` stopped on `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
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