[PATCH] D71539: [SCEV] Look through trivial PHIs.

[Florian Hahn via Phabricator via llvm-commits]

fhahn updated this revision to Diff 284848.
fhahn added a comment.

Strip unnecessary checks.

In D71539#2186028 <https://reviews.llvm.org/D71539#2186028>, @bmahjour wrote:

> Some of the tests added in `llvm/test/Analysis/ScalarEvolution/trivial-phis.ll` come from https://reviews.llvm.org/D71492 but don't have the same expected results. @fhahn do you plan to improve those in this patch or a subsequent patch, or were you planning to leave those to me in D71492 <https://reviews.llvm.org/D71492>?

Yes I added some of the tests from D71492 <https://reviews.llvm.org/D71492>. This patch only improves things for LCSSA phis, not for other trivial phis (multiple equal incoming values). I can look into how this fits in now as a follow up.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D71539/new/

https://reviews.llvm.org/D71539

Files:
  llvm/lib/Analysis/ScalarEvolution.cpp
  llvm/test/Analysis/ScalarEvolution/solve-quadratic-i1.ll
  llvm/test/Analysis/ScalarEvolution/solve-quadratic-overflow.ll
  llvm/test/Transforms/LoopStrengthReduce/funclet.ll

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