[PATCH] D122539: [SelectionDAG][DAGCombiner] Reuse exist node by reassociate

[chenglin.bi via Phabricator via llvm-commits]

bcl5980 created this revision.
bcl5980 added reviewers: RKSimon, spatel, craig.topper, paulwalker-arm, lebedev.ri, arsenm, efriedma, pengfei.
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When already have (op N0, N2), reassociate (op (op N0, N1), N2) to (op (op N0, N2), N1) to reuse the exist (op N0, N2)


https://reviews.llvm.org/D122539

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/AArch64/sve-gather-scatter-addr-opts.ll
  llvm/test/CodeGen/AMDGPU/xor3-i1-const.ll
  llvm/test/CodeGen/X86/ctpop-combine.ll
  llvm/test/CodeGen/X86/masked-iv-safe.ll
  llvm/test/CodeGen/X86/masked-iv-unsafe.ll

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