[llvm] [LoopVectorize] Add support for vectorisation of simple early exit loops (PR #88385)

[Florian Hahn via llvm-commits]

fhahn wrote:


> Yes, I appreciate we test all things individually, but I was just thinking that it is a bit of shame we can't look at some codegen for a loop for all of this work. For example, take the resulting IR of some of the tests in test/Transform/LoopVectorize/AArch64, and create llc tests. Not sure if there's precedent for that, I guess not.

It would probably make sense to have some micro-benchmarks for some loops with varying trip counts (both statically known and unknown) to cover the end-to-end flow and allow for easy evaluation. Sharing the generated assembly end-to-end for some of those might help, as @sjoerdmeijer suggested?

(I don't think we should add end-to-end tests to llvm-project/llvm/tests/ directly that run the vectorizer (and possibly other passes) all the way down to assembly)

https://github.com/llvm/llvm-project/pull/88385