[all-commits] [llvm/llvm-project] d8af31: [LV] Add missed optimization fold-tail test

[Gil Rapaport via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: d8af31006351c9f441d73d4b6c5ea6d109f3d4f1
      https://github.com/llvm/llvm-project/commit/d8af31006351c9f441d73d4b6c5ea6d109f3d4f1
  Author: Gil Rapaport <gil.rapaport at intel.com>
  Date:   2021-01-02 (Sat, 02 Jan 2021)

  Changed paths:
    A llvm/test/Transforms/LoopVectorize/dont-fold-tail-for-assumed-divisible-TC.ll

  Log Message:
  -----------
  [LV] Add missed optimization fold-tail test

The loop vectorizer avoids folding the tail for loop's whose trip-count is
known to SCEV to be divisible by VF. In this case the assumption providing this
information is not taken into account, so the tail is needlessly folded.