[PATCH] D104765: [DAG] Reassociate Add with Or

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: efriedma, RKSimon, craig.topper, spatel.
Herald added subscribers: ecnelises, hiraditya.
dmgreen requested review of this revision.
Herald added a project: LLVM.

We already have reassociation code for Adds and Ors separately in DAG combiner, this adds it for the combination of the two where Ors act like Adds. It reassociates `(add (or (x, c), y) -> (add (add (x, y), c))` where we know that the Ors operands have no common bits set, and the Or has one use.


https://reviews.llvm.org/D104765

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/ARM/add-like-or.ll
  llvm/test/CodeGen/Hexagon/isel-global-offset-alignment.ll
  llvm/test/CodeGen/SystemZ/addr-01.ll
  llvm/test/CodeGen/SystemZ/addr-02.ll

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