[llvm] [LV][EVL] Support in-loop reduction using tail folding with EVL. (PR #90184)

[Florian Hahn via llvm-commits]

fhahn wrote:

>The good news is that I have checked the IR generation in inloop-reduction.ll for IF-EVL-OUTLOOP, and it seems to be correct. This means we can directly open up both out-loop and in-loop reduction.
In conclusion, my suggestion is to change the title to "[LV][EVL] Support reduction idioms using tail folding with EVL." and directly add more RUN commands in the test cases to test the results of out-loop reduction.
> @fhahn What do you think?

Sounds good to me, but it would be good to have some upstream buildbot that builds some code with the various options to have some runtime testing.

https://github.com/llvm/llvm-project/pull/90184