[PATCH] D56783: [SLP] Fix PR40310: The reduction nodes should stay scalar.

[Alexey Bataev via Phabricator via llvm-commits]

ABataev created this revision.
ABataev added reviewers: RKSimon, spatel, hfinkel, fedor.sergeev.

Sometimes the SLP vectorizer tries to vectorize the horizontal reduction
nodes during regular vectorization. This may happen inside of the loops,
when there are some vectorizable PHIs. Patch fixes this by checking if
the node is the reduction node and thus it must not be vectorized, it must
be gathered.


Repository:
  rL LLVM

https://reviews.llvm.org/D56783

Files:
  lib/Transforms/Vectorize/SLPVectorizer.cpp
  test/Transforms/SLPVectorizer/X86/PR39774.ll
  test/Transforms/SLPVectorizer/X86/PR40310.ll

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