[PATCH] D52154: [LoopInterchange] Preserve LCSSA.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: efriedma, mcrosier, davide.

This patch extends LoopInterchange to move LCSSA to the right place
after interchanging. This is required for LoopInterchange to become a
function pass.

An alternative to the manual moving of the PHIs, we could also re-form
the LCSSA phis for a set of interchanged loops, but that's more
expensive.


https://reviews.llvm.org/D52154

Files:
  lib/Transforms/Scalar/LoopInterchange.cpp
  test/Transforms/LoopInterchange/interchangeable.ll
  test/Transforms/LoopInterchange/lcssa.ll
  test/Transforms/LoopInterchange/phi-ordering.ll
  test/Transforms/LoopInterchange/reductions.ll

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