[PATCH] D151866: [LoopPeel] Reduce peel count for chains of invariant phis.

[Joshua Cao via Phabricator via llvm-commits]

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Update commit msg


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rename variable


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Add another test case


If a Phi takes a previous phi in the same block as input, the phi
becomes loop invariant in the same iteration as the input.

For example, both %a and %b become loop invariant on the second
iteration:

  for (...) {
    %a = phi(0, %invariant)
    %b = phi(1, %a)
  }

The peeling with size limit test is modified to test its intended use
case.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D151866

Files:
  llvm/lib/Transforms/Utils/LoopPeel.cpp
  llvm/test/Transforms/LoopUnroll/peel-loop-not-forced.ll
  llvm/test/Transforms/LoopUnroll/peel-loop-phi-analysis.ll

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