[PATCH] D105632: [LV] Use lookThroughAnd with logical reductions

[Kerry McLaughlin via Phabricator via llvm-commits]

kmclaughlin updated this revision to Diff 358651.
kmclaughlin added a comment.

- Changed `AddReductionVar` so that for min & max reductions where `lookThroughAnd` has set the Start instruction to the user of the Phi, we do not change the return type. This ensures that we create the reduction with the wider type (e.g. i32) and truncate the result back to the smaller type (e.g. i8).


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D105632/new/

https://reviews.llvm.org/D105632

Files:
  llvm/lib/Analysis/IVDescriptors.cpp
  llvm/test/Transforms/LoopVectorize/reduction-inloop-pred.ll
  llvm/test/Transforms/LoopVectorize/reduction-inloop.ll
  llvm/test/Transforms/LoopVectorize/trunc-reductions.ll

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