[PATCH] D66718: [DAGCombiner] (insert_vector_elt (vector_shuffle X, Y), (extract_vector_elt X, N), IdxC) -> (vector_shuffle X, Y)

[Amaury SECHET via Phabricator via llvm-commits]

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

This is beneficial when the shuffle is only used once and end up being generated in a few places when some node is combined into a shuffle.


Repository:
  rL LLVM

https://reviews.llvm.org/D66718

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/madd.ll
  test/CodeGen/X86/vector-shuffle-combining.ll

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