[PATCH] D42899: [X86] Teach X86DAGToDAGISel::shrinkAndImmediate to preserve upper 32 zeroes of a 64 bit mask.

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

Don't know this code that well - @spatel any comments?



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Comment at: lib/Target/X86/X86ISelDAGToDAG.cpp:2489
 
   // Bail out if the mask constant is already negative. It can't shrink more.
   APInt MaskVal = And1C->getAPIntValue();
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Repository:
  rL LLVM

https://reviews.llvm.org/D42899