[PATCH] D111153: [SLP]Detect reused scalars in all possible gathers for better vectorization cost.

[Alexey Bataev via Phabricator via llvm-commits]

ABataev created this revision.
ABataev added reviewers: RKSimon, spatel, dtemirbulatov, anton-afanasyev.
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Some initially gathered nodes missed the check for the reused scalars,
which leads to high gather cost. Such nodes still can be represented as
m gathers + shuffle instead of n gathers, where m < n.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D111153

Files:
  llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
  llvm/test/Transforms/SLPVectorizer/X86/commutativity.ll

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