diff --git a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
--- a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
@@ -11536,6 +11536,7 @@
       auto DstReg = MI.getOperand(0).getReg();
       auto MIB = BuildMI(MBB, MI, MI.getDebugLoc(), TII.get(Opcode), DstReg)
                      .add(MI.getOperand(1));
+      (void)MIB;
       LLVM_DEBUG(dbgs() << "        to: " << *MIB.getInstr());
       MI.eraseFromParent();
     }