[llvm] [LoopVectorizer] Allow partial reductions to be made in predicated loops (PR #124268)

[Sam Tebbs via llvm-commits]

SamTebbs33 wrote:

> Do you know why the other predication test isn't getting a partial reduction?

It actually looks like the other predicated test is missing the loop metadata to make it predicated. It should still get partially-reduced if you add the `!loop !7` metadata to it.

https://github.com/llvm/llvm-project/pull/124268