[PATCH] D58009: [DAGCombine] Simplify funnel shifts with undef args to bitshifts

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: spatel, lebedev.ri.
Herald added a project: LLVM.

Now that we have SimplifyDemandedBits support for funnel shifts (rL353539 <https://reviews.llvm.org/rL353539>), we need to simplify funnel shifts back to bitshifts in cases where either argument has been folded to undef.


Repository:
  rL LLVM

https://reviews.llvm.org/D58009

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/funnel-shift.ll

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