[all-commits] [llvm/llvm-project] 9dd83f: [DAG] visitVECTOR_SHUFFLE - attempt to match commu...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9dd83f5ee8697fdb41ba73bc70d845085715b01d
      https://github.com/llvm/llvm-project/commit/9dd83f5ee8697fdb41ba73bc70d845085715b01d
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2021-03-01 (Mon, 01 Mar 2021)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/Thumb2/mve-shuffle.ll
    M llvm/test/CodeGen/Thumb2/mve-vld3.ll
    M llvm/test/CodeGen/X86/oddshuffles.ll
    M llvm/test/CodeGen/X86/pr34592.ll

  Log Message:
  -----------
  [DAG] visitVECTOR_SHUFFLE - attempt to match commuted shuffles with MergeInnerShuffle.

Try to match "shuffle(C, shuffle(A, B, M0), M1) -> shuffle(A, B, M2)" etc. by using MergeInnerShuffle's commuted inner shuffle mode.