fhahn wrote:

Hm, happy to include the full change. We evaluated carefully evaluated this for 
Apple CPUs, where this is a significant improvement, with little risk given the 
evaluation on Apple platforms.

> Is this mitigating a regression? If not, I don't think we should backport 
> optimization improvements.

It does not mitigate a specific regression introduced recently, but fixes a 
number of cases of unprofitable SLP vectorization.

>From 
>https://discourse.llvm.org/t/llvm-21-x-release-information-and-branching/87065,
> my understand was that we will relax what patches we take until RC2 in order 
>to give developers time to finish or cut features, given that the branch was 
>pulled forward with relatively short notice.

https://github.com/llvm/llvm-project/pull/149815
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