tree bbf748d9251f4872b528dd1e1bd69b996fb2e57d
parent 93312b1fb7d2501df00aaf8644ab2ec5d9a179af
author Alexey Bataev <a.bataev@hotmail.com> 1547653192 +0000
committer Alexey Bataev <a.bataev@hotmail.com> 1547653192 +0000

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

Summary:
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.

Reviewers: RKSimon, spatel, hfinkel, fedor.sergeev

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D56783

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351349 91177308-0d34-0410-b5e6-96231b3b80d8