[PATCH] D138904: [AArch64] Transform shift+and to shift+shift to select more shifted register

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and (shl/srl/sra, x, c), mask --> shl (srl/sra, x, c1), c2


https://reviews.llvm.org/D138904

Files:
  llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
  llvm/test/CodeGen/AArch64/shiftregister-from-and.ll

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