[PATCH] D81013: [InstCombine] move vector select ahead of select-shuffle

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

Ah, i guess i see it.
The problem is that `ShuffleVectorInst::isSingleSourceMask(ArrayRef<int> Mask)` is kinda broken:
it can't tell `isSingleSourceMaskImpl()` how many src elts there are,
so naturally it will immediately assert as long as it selects from non-first source..


Repository:
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  https://reviews.llvm.org/D81013/new/

https://reviews.llvm.org/D81013