[PATCH] D56668: [WIP][CodeGenPrepare] Duplicate and sink shuffles and extends if they can be done for free.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
Herald added a subscriber: javed.absar.

TODO:

- This needs integrating with TLI/TTI.
- Cover more cases
- limit to cases where all uses of ext/shuffle are free, to avoid adding additional live ranges.


https://reviews.llvm.org/D56668

Files:
  lib/CodeGen/CodeGenPrepare.cpp
  test/Transforms/CodeGenPrepare/AArch64/sink-free-instructions.ll

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