[PATCH] D23897: [SelectionDAG] Generate vector_shuffle nodes for undersized result vector sizes

[Michael Kuperstein via llvm-commits]

mkuper added a comment.

Also, this has a really bad (but easy to fix) bug in it, that causes the shuffle sequence to be completely wrong...
I'm going to commit a test-case that checks the code we currently generate, for different types, and then put up a patch that shows the differences.


https://reviews.llvm.org/D23897