[PATCH] D35563: [DAG] Optimize away degenerate INSERT_VECTOR_ELT nodes.

[Nirav Dave via Phabricator via llvm-commits]

niravd created this revision.

Add missing vector write of vector read reduction, i.e.:

(insert_vector_elt x (extract_vector_elt x idx) idx) to x


https://reviews.llvm.org/D35563

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/vector-shift-ashr-256.ll
  test/CodeGen/X86/vector-shift-lshr-256.ll
  test/CodeGen/X86/vector-shift-shl-256.ll
  test/CodeGen/X86/vector-shuffle-512-v8.ll

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