commit 0af04f7046e06eb43e7c979651f5d7529be79805
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 d40ca1076c4bf7fcfeedd9b7f656c70b582b5c0e
parent c9cb89b50af46ecea4575ec02b646ce7a3b89388

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40722 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/ScheduleDAG.cpp

diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
index 3738702..192b076 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
+++ b/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 {