[PATCH] D105053: [INSTCOMBINE] Transform reduction(shuffle V, poison, unique_mask) to reduction(V).

[Alexey Bataev via Phabricator via llvm-commits]

ABataev added inline comments.


================
Comment at: llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp:2014
+        SmallBitVector UsedIndeces(Mask.size());
+        for (int Idx : Mask) {
+          if (Idx == UndefMaskElem || UsedIndeces.test(Idx))
----------------
lebedev.ri wrote:
> This doesn't deal with non-canonical shuffle variant properly (and the test is missing)
> 
> 
What do you mean by `non-canonical shuffle`?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D105053/new/

https://reviews.llvm.org/D105053