[PATCH] D131189: [DAGCombine] Hoist shifts out of a logic operations tree.

[Filipp Zhinkin via Phabricator via llvm-commits]

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Hoist and combine shift operations from logic operations tree:

logic (logic (SH x0, s), y), (logic (SH x1, s), z)

  --> logic (SH (logic x0, x1), s), (logic y, z)

The transformation improves code generated for some cases
related to the issue https://github.com/llvm/llvm-project/issues/49541.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D131189

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/ARM/icmp-shift-opt.ll
  llvm/test/CodeGen/ARM/shift-combine.ll
  llvm/test/CodeGen/PowerPC/p10-handle-split-promote-vec.ll
  llvm/test/CodeGen/X86/bswap_tree2.ll
  llvm/test/CodeGen/X86/shift-combine.ll

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