[PATCH] D152927: [InstCombine] Fold binop op shifts with related amounts

[Nikita Popov via Phabricator via llvm-commits]

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Fold

  binop(shift(ShiftedC1, ShAmt), shift(ShiftedC2, add(ShAmt, AddC)))
    ->
  shift(binop(ShiftedC1, shift(ShiftedC2, AddC)), ShAmt)

where both shifts are the same and AddC is a valid shift amount.


https://reviews.llvm.org/D152927

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  llvm/test/Transforms/InstCombine/binop-of-displaced-shifts.ll

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