[all-commits] [llvm/llvm-project] 1b2943: [llvm] Fix crash caused by reprocessing complex re...

[Nicholas Guy via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1b2943534fa20a61c07592a9bd90203e682ae0f4
      https://github.com/llvm/llvm-project/commit/1b2943534fa20a61c07592a9bd90203e682ae0f4
  Author: Nicholas Guy <nicholas.guy at arm.com>
  Date:   2025-01-09 (Thu, 09 Jan 2025)

  Changed paths:
    M llvm/lib/CodeGen/ComplexDeinterleavingPass.cpp
    A llvm/test/CodeGen/AArch64/complex-deinterleaving-opt-crash.ll

  Log Message:
  -----------
  [llvm] Fix crash caused by reprocessing complex reductions (#122077)

If a complex pattern had the shape of both a complex->complex reduction
and a complex->single reduction, the matching would recognise both and
deem the graph a valid transformation. Preventing this reprocessing
results in only one of these matching, meaning that in the case of an
invalid graph, we don't try to transform it anyway.



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