[PATCH] D29489: Optimize SETCC + VSEL of incompatible or illegal types

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

I think we'll eliminate the redundant sign-extend if you extend SelectionDAG::ComputeNumSignBits to handle SIGN_EXTEND_VECTOR_INREG the same way it handles SIGN_EXTEND.


https://reviews.llvm.org/D29489