diff --git a/lib/SPIRV/OCL20ToSPIRV.cpp b/lib/SPIRV/OCL20ToSPIRV.cpp
index d63eff4..348a90e 100644
--- a/lib/SPIRV/OCL20ToSPIRV.cpp
+++ b/lib/SPIRV/OCL20ToSPIRV.cpp
@@ -376,36 +376,37 @@ bool OCL20ToSPIRV::runOnModule(Module &Module) {
 }
 
 void OCL20ToSPIRV::visitAtomicRMWInst(AtomicRMWInst &ARMWI) {
-    SmallVector<Value *, 16> Args;
-    Args.push_back(ARMWI.getPointerOperand());
-    Args.push_back(ARMWI.getValOperand());
-    FunctionType *FT =
-        FunctionType::get(ARMWI.getType(), getTypes(Args), false /*isVarArg*/);
-    // TODO: remove this hard code function name
-    std::string lib_func_name = "";
-    if (ARMWI.getOperation() == llvm::AtomicRMWInst::BinOp::Add) {
-      lib_func_name = "_Z10atomic_addPU8CLglobalVii";
-    } else if (ARMWI.getOperation() == llvm::AtomicRMWInst::BinOp::Xchg) {
-      lib_func_name = "_Z11atomic_xchgPU8CLglobalVii";
-    } else if (ARMWI.getOperation() == llvm::AtomicRMWInst::BinOp::Max) {
-      lib_func_name = "_Z10atomic_maxPU8CLglobalVii";
-    } else if (ARMWI.getOperation() == llvm::AtomicRMWInst::BinOp::Min) {
-      lib_func_name = "_Z10atomic_minPU8CLglobalVii";
-    } else if (ARMWI.getOperation() == llvm::AtomicRMWInst::BinOp::And) {
-      lib_func_name = "_Z10atomic_andPU8CLglobalVii";
-    } else if (ARMWI.getOperation() == llvm::AtomicRMWInst::BinOp::Or) {
-      lib_func_name = "_Z9atomic_orPU8CLglobalVii";
-    } else if (ARMWI.getOperation() == llvm::AtomicRMWInst::BinOp::Xor) {
-      lib_func_name = "_Z10atomic_xorPU8CLglobalVii";
-    } else {
-      std::cout << "unsupport atomic instruction\n";
-      exit(1);
-    }
-    Function *NewF =
-        Function::Create(FT, GlobalValue::ExternalLinkage, lib_func_name, M);
-    CallInst *NewCall = CallInst::Create(NewF, Args, "", &ARMWI);
-    ARMWI.replaceAllUsesWith(NewCall);
-    ARMWI.eraseFromParent();
+  SmallVector<Value *, 16> Args;
+  Args.push_back(ARMWI.getPointerOperand());
+  Args.push_back(ARMWI.getValOperand());
+  FunctionType *FT =
+      FunctionType::get(ARMWI.getType(), getTypes(Args), false /*isVarArg*/);
+  // TODO: remove this hard code function name
+  std::string lib_func_name = "";
+  if (ARMWI.getOperation() == llvm::AtomicRMWInst::BinOp::Add) {
+    lib_func_name = "_Z10atomic_addPU8CLglobalVii";
+  } else if (ARMWI.getOperation() == llvm::AtomicRMWInst::BinOp::Xchg) {
+    lib_func_name = "_Z11atomic_xchgPU8CLglobalVii";
+  } else if (ARMWI.getOperation() == llvm::AtomicRMWInst::BinOp::Max) {
+    lib_func_name = "_Z10atomic_maxPU8CLglobalVii";
+  } else if (ARMWI.getOperation() == llvm::AtomicRMWInst::BinOp::Min) {
+    lib_func_name = "_Z10atomic_minPU8CLglobalVii";
+  } else if (ARMWI.getOperation() == llvm::AtomicRMWInst::BinOp::And) {
+    lib_func_name = "_Z10atomic_andPU8CLglobalVii";
+  } else if (ARMWI.getOperation() == llvm::AtomicRMWInst::BinOp::Or) {
+    lib_func_name = "_Z9atomic_orPU8CLglobalVii";
+  } else if (ARMWI.getOperation() == llvm::AtomicRMWInst::BinOp::Xor) {
+    lib_func_name = "_Z10atomic_xorPU8CLglobalVii";
+  } else {
+    std::cout << "unsupport atomic instruction\n";
+    exit(1);
+  }
+  auto NewF = M->getOrInsertFunction(lib_func_name, FT);
+  // Function *NewF =
+  //     Function::Create(FT, GlobalValue::ExternalLinkage, lib_func_name, M);
+  CallInst *NewCall = CallInst::Create(NewF, Args, "", &ARMWI);
+  ARMWI.replaceAllUsesWith(NewCall);
+  ARMWI.eraseFromParent();
 }
 
 // The order of handling OCL builtin functions is important.