[PATCH] D66804: [TargetLowering] Add buildLegalVectorShuffle facility to help build legal shuffles

[Amaury SECHET via Phabricator via llvm-commits]

deadalnix created this revision.
deadalnix added reviewers: craig.topper, efriedma, RKSimon, lebedev.ri.
Herald added subscribers: llvm-commits, javed.absar.
Herald added a project: LLVM.

There are at least 2 ways to express the same shuffle. Various pieces of code explicit check for both option, but other places do not when they would benefit from doing it. This patches refactor the codebase to use buildLegalVectorShuffle in order to make that behavior more consistent.


Repository:
  rL LLVM

https://reviews.llvm.org/D66804

Files:
  include/llvm/CodeGen/TargetLowering.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  lib/Target/ARM/ARMISelLowering.cpp

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