Revise per review comments.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41409 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 2b119a0..fda0589 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -3195,7 +3195,7 @@
     return DAG.getNode(ISD::FCOPYSIGN, VT, N0, N1);
   
   if (N1CFP) {
-    APFloat V = N1CFP->getValueAPF();
+    const APFloat& V = N1CFP->getValueAPF();
     // copysign(x, c1) -> fabs(x)       iff ispos(c1)
     // copysign(x, c1) -> fneg(fabs(x)) iff isneg(c1)
     if (!V.isNegative())