[PATCH] D130251: [DAGCombine] Mask doesn't have to be (EltSize - 1) exactly when combining rotation

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

How about this?



================
Comment at: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:7311
   //
   // Below, Mask == EltSize - 1 when using [A] and is all-ones otherwise.
   //
----------------
// This allows us to peek through any operations that only the affect Mask's un-demanded bits.


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  https://reviews.llvm.org/D130251/new/

https://reviews.llvm.org/D130251