Remove unnecessary copies of value parameters.

PiperOrigin-RevId: 155511618

2 files changed, 3 insertions, 2 deletions

diff --git a/tensorflow/cc/framework/cc_op_gen.cc b/tensorflow/cc/framework/cc_op_gen.cc
index b7e9948e9d..799492a4eb 100644
--- a/tensorflow/cc/framework/cc_op_gen.cc
+++ b/tensorflow/cc/framework/cc_op_gen.cc
@@ -198,7 +198,7 @@ string PrintTensorProto(const TensorProto& proto) {
                          ").AsTensorProto()");
 }
 
-string PrintAttrValue(string op, const AttrValue& attr_value) {
+string PrintAttrValue(const string& op, const AttrValue& attr_value) {
   switch (attr_value.value_case()) {
     case AttrValue::kS:
       return PrintString(attr_value.s());
diff --git a/tensorflow/cc/framework/cc_ops_test.cc b/tensorflow/cc/framework/cc_ops_test.cc
index 6dc0d84c16..92c97d107d 100644
--- a/tensorflow/cc/framework/cc_ops_test.cc
+++ b/tensorflow/cc/framework/cc_ops_test.cc
@@ -32,7 +32,8 @@ Output Linear(const Scope& scope, Input x, Input w, Input b) {
   return BiasAdd(cop_scopes.last, m, b);
 }
 
-void GetColocationConstraints(Output tensor, std::vector<string>* constraints) {
+void GetColocationConstraints(const Output& tensor,
+                              std::vector<string>* constraints) {
   constraints->clear();
   TF_EXPECT_OK(
       GetNodeAttr(tensor.op().node()->def(), kColocationAttrName, constraints));