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be77894aef
Because of how the allocation of VSX registers interacts with the call-lowering code, we sometimes end up generating self VSX copies. Specifically, things like this: %VSL2<def> = COPY %F2, %VSL2<imp-use,kill> (where %F2 is really a sub-register of %VSL2, and so this copy is a nop) The problem is that ExpandPostRAPseudos always assumes that *some* instruction has been inserted, and adds implicit defs to it. This is a problem if no copy was inserted because it can cause subtle problems during post-RA scheduling. These self copies will have to be removed some other way. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204976 91177308-0d34-0410-b5e6-96231b3b80d8
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