[PATCH] D30751: [MachineCopyPropagation] Extend pass to do COPY source forwarding

[Matthias Braun via Phabricator via llvm-commits]

MatzeB added a comment.

For the record: This looks very similar to https://reviews.llvm.org/D20531 and https://reviews.llvm.org/D21455. Though the earlier two attempts were somewhat sketchy in terms of correctness as they were renaming physregs and we have no good way in LLVM to detect which ones are legal to rename.


https://reviews.llvm.org/D30751