[PATCH] D102269: [ARM] Expand predecessor search to multiple blocks when reverting WhileLoopStarts

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: SjoerdMeijer, malharJ, samtebbs, ostannard, simon_tatham.
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We were previously only searching a single preheader for call instructions when reverting WhileLoopStarts to DoLoopStarts. This extends that to multiple blocks that can come up when, for example a loop is expanded from a memcpy. It also expends the instructions from just Call's to also include other LoopStarts, to catch other low overhead loops in the preheader.


https://reviews.llvm.org/D102269

Files:
  llvm/lib/Target/ARM/MVETPAndVPTOptimisationsPass.cpp
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/memcall.ll

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