[PATCH] D83789: [X86][SSE] Attempt to match OP(SHUFFLE(X,Y),SHUFFLE(X,Y)) -> SHUFFLE(HOP(X,Y))

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon updated this revision to Diff 280687.
RKSimon added a comment.

Always permit lane crossing on AVX2 targets, and on non-AVX2 targets, integer hops will always be split to 128-bits so permit lane crossing there as well.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D83789/new/

https://reviews.llvm.org/D83789

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/haddsub-3.ll
  llvm/test/CodeGen/X86/haddsub-4.ll
  llvm/test/CodeGen/X86/haddsub-shuf.ll
  llvm/test/CodeGen/X86/haddsub-undef.ll
  llvm/test/CodeGen/X86/vector-shuffle-256-v4.ll
  llvm/test/CodeGen/X86/vector-shuffle-256-v8.ll

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