[all-commits] [llvm/llvm-project] f0eeb3: [GISel][CombinerHelper] Combine shuffle_vector sca...

[qcolombet via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: f0eeb3c7a7136dd043b792ff2d321ad492db203a
      https://github.com/llvm/llvm-project/commit/f0eeb3c7a7136dd043b792ff2d321ad492db203a
  Author: Quentin Colombet <qcolombet at apple.com>
  Date:   2019-10-30 (Wed, 30 Oct 2019)

  Changed paths:
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/prelegalizercombiner-shuffle-vector.mir

  Log Message:
  -----------
  [GISel][CombinerHelper] Combine shuffle_vector scalar to build_vector

Teach the combiner helper how to replace shuffle_vector of scalars
into build_vector.
I am not particularly happy about having to add this combine, but we
currently get those from <1 x iN> from the IR.

Bonus: This fixes an assert in the shuffle_vector combines since before
this patch, we were expecting vector types.