[llvm] [LoopIdiomVectorize] Recognize and transform minidx pattern (PR #144987)

[Sjoerd Meijer via llvm-commits]

sjoerdmeijer wrote:

This might belong in the vectoriser, but the I followed the link to the discourse discussion and learned that there is an ongoing activity since 2023. I therefore think that a pattern match approach is not ideal but reasonable as a stopgap and for what it is worth there is a lot of precedent for this in this file. This pattern match is quite a bit of code, but it's fairly straightforward. I haven't looked at this in detail, but how about progressing this, @david-arm ?



https://github.com/llvm/llvm-project/pull/144987