[PATCH] D38942: [DAG] Promote ADDCARRY / SUBCARRY

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

I can't see how that DAGCombine transform is actually profitable if the type isn't legal... but I guess we might as well just fix the legalizer so we don't trip over it again.


https://reviews.llvm.org/D38942