[PATCH] D132773: [SLP] Workaround for vectorizing loads with more than one store uses.

[Vasileios Porpodas via Phabricator via llvm-commits]

vporpo created this revision.
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   L0      L1
  / \     /  \

S0  S0'  S1  S1'

In AArch64 this simple pattern of loads with multiple store users is not getting
vectorized because of the cost of the external uses.
This patch is a workaround that reduces the cost of the external use if the def
is a load and the user can be found in the `Stores` seeds map.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132773

Files:
  llvm/include/llvm/Transforms/Vectorize/SLPVectorizer.h
  llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
  llvm/test/Transforms/SLPVectorizer/AArch64/load-used-by-two-stores.ll

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