[llvm] [Passes] Run IndVars after late partial unrolling. (PR #81275)

[Nikita Popov via llvm-commits]

nikic wrote:

We already run the "core" part of IndVarSimplify via simplifyLoopIVs() in simplifyLoopAfterUnroll(). It sounds like the part you additionally want in your test case is the replaceCongruentIVs() optimization? Would it make more sense to call that from simplifyLoopIVs()?

Is your test case representative of the actual optimization you're trying to achieve? It doesn't look very compelling to me, as this seems like the kind of thing that LSR would fix up anyway.

https://github.com/llvm/llvm-project/pull/81275