commit 358c3d1dac31258ba8af1e53646e17bfb4880ddb
author Evan Cheng <evan.cheng@apple.com> Thu Aug 02 05:29:38 2007 +0000
committer Evan Cheng <evan.cheng@apple.com> Thu Aug 02 05:29:38 2007 +0000
tree c20606b20d1adf4e4c3f9cd85e0a87c42e5adfcf
parent 824693c87a4244fed86c1aa8f26e905933e77739

Do not emit copies for physical register output if it's not used.

llvm-svn: 40722

llvm/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp

diff --git a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
index 3738702..192b076 100644
--- a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
@@ -676,7 +676,8 @@
     if (HasPhysRegOuts) {
       for (unsigned i = II.numDefs; i < NumResults; ++i) {
         unsigned Reg = II.ImplicitDefs[i - II.numDefs];
-        EmitCopyFromReg(Node, i, Reg, VRBaseMap);
+        if (Node->hasAnyUseOfValue(i))
+          EmitCopyFromReg(Node, i, Reg, VRBaseMap);
       }
     }
   } else {