[PATCH] D102511: Do actual DCE in LoopUnroll

[Philip Reames via Phabricator via llvm-commits]

reames created this revision.
reames added reviewers: anna, skatkov, Whitney, samparker, dfukalov, nikic.
Herald added subscribers: zzheng, hiraditya, mcrosier.
Herald added a reviewer: bollu.
reames requested review of this revision.
Herald added a project: LLVM.

LoopUnroll does a limited DCE pass after unrolling, but if you have a chain of dead instructions, it only deletes the last one.  Improve the code to recursively delete all trivially dead instructions.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D102511

Files:
  llvm/lib/Transforms/Utils/LoopUnroll.cpp
  llvm/test/Transforms/LoopUnroll/nonlatchcondbr.ll
  llvm/test/Transforms/LoopUnroll/optsize-loop-size.ll
  llvm/test/Transforms/LoopUnroll/pr45939-peel-count-and-complete-unroll.ll
  llvm/test/Transforms/LoopUnroll/scevunroll.ll
  llvm/test/Transforms/LoopUnroll/unroll-header-exiting-with-phis.ll
  llvm/test/Transforms/LoopUnroll/unroll-unconditional-latch.ll
  llvm/test/Transforms/LoopUnrollAndJam/unroll-and-jam.ll

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