[PATCH] D135846: [PowerPC] handle 3 predecessor loop header in ctrloop pass

[ChenZheng via Phabricator via llvm-commits]

shchenz created this revision.
shchenz added reviewers: lkail, PowerPC.
Herald added subscribers: kbarton, hiraditya, nemanjai.
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  After ISEL, the "valid" loop header which has two predecessors
  (one is preheader and the other one is latch) may be transformed
  to have three predecessors by some optimizations, like tail duplicator.
  The three predecessors are preheader, loop latch and the header itself
  if the header is a single block loop.
  
  Before the patch, ctrloop pass assumes two predecessors for candidate
  loop header. This patch fixes this case.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135846

Files:
  llvm/lib/Target/PowerPC/PPCCTRLoops.cpp
  llvm/test/CodeGen/PowerPC/ctrloop-header-three-preds.mir

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