diff --git a/llvm/lib/Target/ARM/A15SDOptimizer.cpp b/llvm/lib/Target/ARM/A15SDOptimizer.cpp
index 30b9c8071ba2b..f8a86a70c0771 100644
--- a/llvm/lib/Target/ARM/A15SDOptimizer.cpp
+++ b/llvm/lib/Target/ARM/A15SDOptimizer.cpp
@@ -157,9 +157,8 @@ unsigned A15SDOptimizer::getPrefSPRLane(unsigned SReg) {
   MachineInstr *MI = MRI->getVRegDef(SReg);
   if (!MI) return ARM::ssub_0;
   MachineOperand *MO = MI->findRegisterDefOperand(SReg);
-
-  assert(MO->isReg() && "Non-register operand found!");
   if (!MO) return ARM::ssub_0;
+  assert(MO->isReg() && "Non-register operand found!");
 
   if (MI->isCopy() && usesRegClass(MI->getOperand(1),
                                     &ARM::SPRRegClass)) {