[all-commits] [llvm/llvm-project] d0e3a5: [SLP]Fix PR64519: Unexpected reordering of gathers.

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d0e3a571e7f7eced43d85891181dad3fb6c0eaa1
      https://github.com/llvm/llvm-project/commit/d0e3a571e7f7eced43d85891181dad3fb6c0eaa1
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2023-08-08 (Tue, 08 Aug 2023)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    A llvm/test/Transforms/SLPVectorizer/X86/scatter-vectorize-reorder-non-empty.ll

  Log Message:
  -----------
  [SLP]Fix PR64519: Unexpected reordering of gathers.

The issue is actually related to ScatterVectorize nodes. If such node
gets reordered during bottom-to-top reordering, it may have associated
non-empty ReorderIndices. In this case, such nodes need to be handled
the same way as regular Vectorize nodes, not NeedToGather nodes. In this
case we need to reorder ReorderIndices array rather than scalars.