[PATCH] D31961: DAGCombine: Combine shuffles of splat-shuffles

[Zvi Rackover via Phabricator via llvm-commits]

zvi updated this revision to Diff 98307.
zvi added a comment.

Update according to Sanjay's comments. I updated the comments with some representative examples, but gave up on annotating the tests since after Isel it's hard to see from the text which elements were undef as we choose arbitrary values for undef elements.


https://reviews.llvm.org/D31961

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/shuffle-of-splat-multiuses.ll

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