[PATCH] D79976: [LV] Handle Fold-Tail of loops with vectorizarion factor (VF) equal to 1

[Anh Tuyen Tran via Phabricator via llvm-commits]

anhtuyen created this revision.
anhtuyen added reviewers: Ayal, fhahn, gilr, rengolin.
anhtuyen added a project: LLVM.
Herald added subscribers: vkmr, rogfer01, rkruppe.

When handling loops whose VF is 1, fold-tail vectorization sets the backedge taken count of the original loop with a vector of a single element. This approach will cause type-mismatch during instruction generartion, as reported in https://reviews.llvm.org/D78847#2029339

Based on discussion with Ayal @Ayal , I provide this patch to address the case of VF==1.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D79976

Files:
  llvm/lib/Transforms/Vectorize/VPlan.cpp
  llvm/test/Transforms/LoopVectorize/tail-folding-vectorization-factor-1-scalar.ll
  llvm/test/Transforms/LoopVectorize/tail-folding-vectorization-factor-1-vector.ll

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