[PATCH] D12828: DAGCombiner::MatchBSwapHWord fix for (t0 | t1) | (t2 | t3)

[Andrew Zhogin via llvm-commits]

andrew.zhogin created this revision.
andrew.zhogin added a reviewer: majnemer.
andrew.zhogin added subscribers: llvm-commits, asl.
Herald added a subscriber: aemerson.

DAGCombiner::MatchBSwapHWord works for ((t0 | t1) | t2) | t3.
But for symmetric case it's broken: (t0 | t1) | (t2 | t3).
This patch fixes it and adds CodeGen test cases for ARM rev16 instruction.

http://reviews.llvm.org/D12828

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/ARM/rev.ll

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