[PATCH] D96345: [DAG] Fold shuffle(bop(shuffle(x,y),shuffle(z,w)),bop(shuffle(a,b),shuffle(c,d)))

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon updated this revision to Diff 323770.
RKSimon added a comment.

Don't merge shuffles if it would introduce any undefined elements


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D96345/new/

https://reviews.llvm.org/D96345

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/bitcast-and-setcc-256.ll
  llvm/test/CodeGen/X86/promote-cmp.ll

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