[PATCH] D121147: [x86] try harder to use shift instead of test if it can save some immediate bytes

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a reviewer: MatzeB.
RKSimon added inline comments.


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Comment at: llvm/lib/Target/X86/X86ISelDAGToDAG.cpp:5632
           ShiftAmt = countLeadingZeros(Mask);
         }
         if (ShiftOpcode != ISD::DELETED_NODE) {
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If we added shifted mask detection would we hit any of the folds that D121320 is targetting?


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  https://reviews.llvm.org/D121147/new/

https://reviews.llvm.org/D121147