[PATCH] D118919: [DAGCombiner] Fold vecreduce_or/and if operand is insert_subvector.

[Sander de Smalen via Phabricator via llvm-commits]

sdesmalen created this revision.
Herald added subscribers: ctetreau, ecnelises, hiraditya.
sdesmalen requested review of this revision.
Herald added subscribers: llvm-commits, alextsao1999.
Herald added a project: LLVM.

Fold:

  vecreduce_or(insert_subvec(zeroinitializer, vec))
  -> vecreduce_or(vec)
  
  vecreduce_and(insert_subvec(allones, vec))
  -> vecreduce_and(vec)
  
  vecreduce_and/or(insert_subvec(undef, vec))
  -> vecreduce_and/or(vec)

This is useful for SVE which uses insert/extract subvector
to convert fixed-width to/from scalable vectors.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D118919

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/AArch64/sve-vecreduce-fold.ll

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