diff --git a/lib/Target/X86/X86ISelDAGToDAG.cpp b/lib/Target/X86/X86ISelDAGToDAG.cpp
index deb197cadd5..bf08dd8c189 100644
--- a/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -491,13 +491,15 @@ void X86DAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
     do {
       for (MachineBasicBlock::iterator I = MBBI->begin(), E = MBBI->end();
            !ContainsFPCode && I != E; ++I) {
-        for (unsigned op = 0, e = I->getNumOperands(); op != e; ++op) {
-          if (I->getOperand(op).isRegister() && I->getOperand(op).isDef() &&
-              MRegisterInfo::isVirtualRegister(I->getOperand(op).getReg()) &&
-              RegMap->getRegClass(I->getOperand(0).getReg()) == 
+        if (I->getNumOperands() != 0 && I->getOperand(0).isRegister()) {
+          for (unsigned op = 0, e = I->getNumOperands(); op != e; ++op) {
+            if (I->getOperand(op).isRegister() && I->getOperand(op).isDef() &&
+                MRegisterInfo::isVirtualRegister(I->getOperand(op).getReg()) &&
+                RegMap->getRegClass(I->getOperand(0).getReg()) == 
                 X86::RFPRegisterClass) {
-            ContainsFPCode = true;
-            break;
+              ContainsFPCode = true;
+              break;
+            }
           }
         }
       }