[PATCH] D53760: [SelectionDAG] Add FoldBUILD_VECTOR to simplify new BUILD_VECTOR nodes

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon updated this revision to Diff 171587.
RKSimon added a comment.

Just use IsIdentity


Repository:
  rL LLVM

https://reviews.llvm.org/D53760

Files:
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/Target/AMDGPU/R600ISelLowering.cpp
  test/CodeGen/AMDGPU/load-local-i16.ll
  test/CodeGen/X86/clear_upper_vector_element_bits.ll
  test/CodeGen/X86/lower-vec-shift.ll

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