[PATCH] D133891: [SLP]Improve isUndefVector function by adding insertelement analysis.

[Steven Johnson via Phabricator via llvm-commits]

srj added a comment.

The line numbers in the ASAN trace are slightly different from this patch, but the culprit seems to be:

  SmallVector<int> InsertMask(NumElts, UndefMaskElem);
  copy(Mask, std::next(InsertMask.begin(), OffsetBeg));    <-- THIS LINE

Not sure about the semantics here, but presumably InsertMask doesn't have the capacity for the copy and gets tromped on...


Repository:
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  https://reviews.llvm.org/D133891/new/

https://reviews.llvm.org/D133891