[PATCH] D146529: [RISCV][NFC] Add test case for SLP reduction vectorization failure

[Luke Lau via Phabricator via llvm-commits]

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Horizontal reductions still occur on RISC-V, despite the maximum SLP VF
reported back by TTI being 1, to disable SLP.
This can cause the cost model to think it can vectorize a gather into
smaller, widened loads, when it will actually fail to do so.
This should ultimately be fixed whenever SLP is re-enabled for RISC-V at
some point.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D146529

Files:
  llvm/test/Transforms/SLPVectorizer/RISCV/reductions.ll

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