[llvm] [LV][NFC] Print VPlan's transformation pipline (PR #72665)

[Florian Hahn via llvm-commits]

fhahn wrote:

Thanks for working on this functionality, should be very helpful in the future.

I think it would be good to have a generic way to register a pass to run, so we have a single place to add the print statements. Eg have a RUN_PASS macro or helper function that takes the function to run plus a name perhaps (or just uses the function name).

Not sure about tying this to debug output, as this potentially adds a lot of output. It might be better to have this controlled by a separate -vplan-print-before-all? Or even better to update all transforms to indicate whether they made changes and have a more compact -vplan-print-before-changed



https://github.com/llvm/llvm-project/pull/72665