Eliminate unnecessary uses of getZExtValue().


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106279 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelDAGToDAG.cpp b/lib/Target/ARM/ARMISelDAGToDAG.cpp
index 9128889..35a983e 100644
--- a/lib/Target/ARM/ARMISelDAGToDAG.cpp
+++ b/lib/Target/ARM/ARMISelDAGToDAG.cpp
@@ -536,7 +536,7 @@
   DebugLoc dl = Op->getDebugLoc();
   if (N.getOpcode() != ISD::ADD) {
     ConstantSDNode *NC = dyn_cast<ConstantSDNode>(N);
-    if (!NC || NC->getZExtValue() != 0)
+    if (!NC || !NC->isNullValue())
       return false;
 
     Base = Offset = N;