[PATCH] D37885: [x86] Bring back the MOVZX64rr* pseudo instructions so that they can be coalesced using X86InstrInfo::isCoalescableExtInstr

[Craig Topper via Phabricator via llvm-commits]

craig.topper planned changes to this revision.
craig.topper added a comment.

I noticed this is missing some load folding of stack reloads  in the multiply tests. I'm also not seeing much benefit and a couple small regressions in our benchmark runs. So I'm going to hold off on this.


https://reviews.llvm.org/D37885