[PATCH] D69149: [GISel][CombinerHelper] Add a combine turning shuffle_vector into concat_vectors

[Quentin Colombet via Phabricator via llvm-commits]

qcolombet created this revision.
qcolombet added reviewers: aditya_nandakumar, volkan, paquette, aemerson, dsanders, arsenm.
Herald added subscribers: Petar.Avramovic, kristof.beyls, wdng.
Herald added a project: LLVM.

Teach the CombinerHelper how to turn shuffle_vectors, that
concatenate vectors, into concat_vectors and add this combine
to the AArch64 pre-legalizer combiner.


Repository:
  rL LLVM

https://reviews.llvm.org/D69149

Files:
  include/llvm/CodeGen/GlobalISel/CombinerHelper.h
  lib/CodeGen/GlobalISel/CombinerHelper.cpp
  lib/Target/AArch64/AArch64PreLegalizerCombiner.cpp
  test/CodeGen/AArch64/GlobalISel/prelegalizercombiner-shuffle-vector.mir

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