[llvm] [VPlan] Add transformation to narrow interleave groups. (PR #106441)

[Florian Hahn via llvm-commits]

fhahn wrote:

@mstorsjo thanks, I recommitted with a fix, limiting this to loops w/o interleaving for now: 577631f0a52884384786bf899951e3094ad7f69c

I ran the ffmpeg tests from the test-suite, but it sounds like the test-suite coverage could be improved by running various encoders with different inputs and checking the output? Would the input files you are using for your testing be suitable for adding to the test-suite and define tests using them?

https://github.com/llvm/llvm-project/pull/106441