[PATCH] D114087: [SLP]Improve registering and merging of compatible shuffles.

[Alexey Bataev via Phabricator via llvm-commits]

ABataev added inline comments.


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Comment at: llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp:6815
+      else
+        LastUndefsCnt = 0;
+      if (NewMask[I] != UndefMaskElem && SM1[I] != UndefMaskElem &&
----------------
RKSimon wrote:
> I don't understand - why do you reset LastUndefsCnt here?
`LastUndefsCnt` is the number of terminating undefmaskelems, that's why I reset it each time we ran into non-undef mask elem.


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  https://reviews.llvm.org/D114087/new/

https://reviews.llvm.org/D114087