[PATCH] D47681: [DAGCombiner] Bug 31275- Extract a shift from a constant mul or udiv if a rotate can be formed

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


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Comment at: lib/CodeGen/SelectionDAG/DAGCombiner.cpp:5371
   bool HasROTR = hasOperation(ISD::ROTR, VT);
   if (!HasROTL && !HasROTR) return nullptr;
 
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@lebedev.ri This should ensure legality of the ROT


https://reviews.llvm.org/D47681