[all-commits] [llvm/llvm-project] 121fb2: [SLP] Fix the Vec lane overridden by the shuffle m...

[tcwzxx via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 121fb2c2ccc9db33278160b485ff0e9d09be9827
      https://github.com/llvm/llvm-project/commit/121fb2c2ccc9db33278160b485ff0e9d09be9827
  Author: tcwzxx <tcwzxx at gmail.com>
  Date:   2024-08-29 (Thu, 29 Aug 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/insertelement-across-zero.ll

  Log Message:
  -----------
  [SLP] Fix the Vec lane overridden by the shuffle mask (#106341)

Currently, SLP uses shuffle for the external user of `InsertElementInst`
and iterates through the `InsertElementInst` chain to fill the mask with
constant indices. However, it may override the original Vec lane. Using
the original Vec lane is sufficient.



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