[PATCH] D17889: [MachineCopyPropagation] Expose more dead copies across instructions with regmasks

[Quentin Colombet via llvm-commits]

qcolombet added a comment.

Hi Jun,

Although I can see how this helps, I wonder if the additional complexity is worth.
Indeed, what cases do we catch here that are not handled by DCE?

Cheers,
-Quentin


http://reviews.llvm.org/D17889