[PATCH] D35073: [RegisterCoalescer] Fix for subrange join unreachable

[Matthias Braun via Phabricator via llvm-commits]

MatzeB added a comment.

I'm confused by this change (and the testcase doesn't really help understanding what is going on). You are probably onto a real bug here where we cannot assume the same lanemasks work for the input/output register class of a copy. However that should be independent of the fact that a full or partial copy is present.


https://reviews.llvm.org/D35073