[PATCH] D88873: [LV] Collect dead induction truncates

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: gilr, Ayal, fhahn, mssimpso, rengolin, SjoerdMeijer.
Herald added subscribers: rogfer01, bollu, hiraditya.
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Herald added a subscriber: vkmr.

We currently collect the ICmp and Add from an induction variable, marking them as dead so that vplan values are not created for them. This extends that to include any single use trunk from the ICmp, which allows the Add to more readily be removed too.

This can help with costing vplan nodes, as the ICmp and Add are more reliably removed and are not double-counted.


https://reviews.llvm.org/D88873

Files:
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/test/Transforms/LoopVectorize/ARM/tail-folding-not-allowed.ll
  llvm/test/Transforms/LoopVectorize/X86/pr36524.ll
  llvm/test/Transforms/LoopVectorize/X86/tail_loop_folding.ll
  llvm/test/Transforms/LoopVectorize/followup.ll
  llvm/test/Transforms/LoopVectorize/if-pred-stores.ll

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