[SYCLomatic] Not add namespace of template operator function. (#2233)

Signed-off-by: Tang, Jiajun [email protected]

Author: tangjj11

clang/lib/DPCT/ASTTraversal.cpp

@@ -2844,6 +2844,8 @@ namespace ast_matchers {
 AST_MATCHER(FunctionDecl, overloadedVectorOperator) {
   if (!DpctGlobalInfo::isInAnalysisScope(Node.getBeginLoc()))
     return false;
+  if (Node.isTemplateInstantiation())
+    return false; // Template operator function need not add namespace.
 
   switch (Node.getOverloadedOperator()) {
   default: {

clang/test/dpct/operator_overload/operator_overload_template.cu

@@ -0,0 +1,22 @@
+// UNSUPPORTED: cuda-8.0, cuda-9.0, cuda-9.1, cuda-9.2, cuda-10.0, cuda-10.1, cuda-10.2, cuda-11.0
+// UNSUPPORTED: v8.0, v9.0, v9.1, v9.2, v10.0, v10.1, v10.2, v11.0
+// RUN: dpct -out-root %T/operator_overload/operator_overload_template %s --cuda-include-path="%cuda-path/include"
+// RUN: FileCheck --input-file %T/operator_overload/operator_overload_template/operator_overload_template.dp.cpp --match-full-lines %s
+// RUN: %if build_lit %{icpx -c -fsycl %T/operator_overload/operator_overload_template/operator_overload_template.dp.cpp -o %T/operator_overload/operator_overload_template/operator_overload_template.dp.o %}
+
+#include "cuda_fp16.h"
+
+// CHECK: template <typename T> struct S {};
+// CHECK-NEXT: template <typename T> void operator*(T a, const S<T> &b) {}
+template <typename T> struct S {};
+template <typename T> void operator*(T a, const S<T> &b) {}
+
+int main() {
+  S<float> s1;
+  S<__half> s2;
+  // CHECK: (float)1 * s1;
+  (float)1 * s1;
+  // CHECK: sycl::half(1.0) * s2;
+  __half(1.0) * s2;
+  return 0;
+}