[PATCH] D127073: [SLP] Treat undef as any other constant

[Alexey Bataev via Phabricator via llvm-commits]

ABataev added inline comments.


================
Comment at: llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp:7598
       if (isConstant(V)) {
         ReuseShuffleIndicies.emplace_back(UniqueValues.size());
         UniqueValues.emplace_back(V);
----------------
For undefs need to push `UndefMaskElem`:
```
ReuseShuffleIndicies.emplace_back(isa<UndefValue>(V) ? UndefMaskElem : UniqueValues.size());
```


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D127073/new/

https://reviews.llvm.org/D127073