[AMDGPU] : revert r315908

llvm-svn: 315916

1 files changed, 10 insertions, 12 deletions

diff --git a/llvm/lib/CodeGen/MachineCopyPropagation.cpp b/llvm/lib/CodeGen/MachineCopyPropagation.cpp
index 030db43..61f56ff 100644
--- a/llvm/lib/CodeGen/MachineCopyPropagation.cpp
+++ b/llvm/lib/CodeGen/MachineCopyPropagation.cpp
@@ -275,20 +275,18 @@ void MachineCopyPropagation::CopyPropagateBlock(MachineBasicBlock &MBB) {
         ClobberRegister(Reg);
       }
 
-      if (!MI->getOperand(0).isDead() && !MI->getOperand(1).isUndef()) {
-        // Remember Def is defined by the copy.
-        for (MCSubRegIterator SR(Def, TRI, /*IncludeSelf=*/true); SR.isValid();
-             ++SR) {
-          CopyMap[*SR] = MI;
-          AvailCopyMap[*SR] = MI;
-        }
+      // Remember Def is defined by the copy.
+      for (MCSubRegIterator SR(Def, TRI, /*IncludeSelf=*/true); SR.isValid();
+           ++SR) {
+        CopyMap[*SR] = MI;
+        AvailCopyMap[*SR] = MI;
+      }
 
-        // Remember source that's copied to Def. Once it's clobbered, then
-        // it's no longer available for copy propagation.
-        RegList &DestList = SrcMap[Src];
-        if (!is_contained(DestList, Def))
+      // Remember source that's copied to Def. Once it's clobbered, then
+      // it's no longer available for copy propagation.
+      RegList &DestList = SrcMap[Src];
+      if (!is_contained(DestList, Def))
           DestList.push_back(Def);
-      }
 
       continue;
     }