[llvm-branch-commits] [llvm] [LoopVectorize] Support vectorization of compressing patterns (PR #214491)

[Benjamin Maxwell via llvm-branch-commits]

MacDue wrote:

> Early exit from the update/store block and a store in the exit. If it fails some of the existing legality checks - that's fine, it's intended as a negative test, I'd imagine.

I've added a simple early exit negative test. It comes close to vectorization but bails out in the VPlan early exit handling (as it can find a branch-on-two-conds as there's multiple blocks). 

https://github.com/llvm/llvm-project/pull/214491