[luci/service] Introduce Sign operation

compiler/luci/service/include/luci/Service/CircleShapeInference.h

@@ -134,6 +134,7 @@ class Algorithm final : public luci::CircleNodeVisitor<loco::TensorShape>
   // loco::TensorShape visit(const luci::CircleSelect *node) final;
   // loco::TensorShape visit(const luci::CircleSelectV2 *node) final;
   // loco::TensorShape visit(const luci::CircleShape *node) final;
+  // loco::TensorShape visit(const luci::CircleSign *node) final;
   // loco::TensorShape visit(const luci::CircleSin *node) final;
   // loco::TensorShape visit(const luci::CircleSlice *node) final;
   loco::TensorShape visit(const luci::CircleSoftmax *node) final;

compiler/luci/service/include/luci/Service/CircleTypeInference.h

@@ -133,6 +133,7 @@ class Algorithm final : public luci::CircleNodeVisitor<loco::DataType>
   // loco::DataType visit(const luci::CircleSelect *node) final;
   // loco::DataType visit(const luci::CircleSelectV2 *node) final;
   // loco::DataType visit(const luci::CircleShape *node) final;
+  // loco::DataType visit(const luci::CircleSign *node) final;
   // loco::DataType visit(const luci::CircleSin *node) final;
   // loco::DataType visit(const luci::CircleSlice *node) final;
   // loco::DataType visit(const luci::CircleSoftmax *node) final;

compiler/luci/service/src/CircleCloneNode.h

@@ -201,6 +201,7 @@ template <> class CloneNodeLet<CN::STUV> final : public luci::CircleNodeVisitor<
   luci::CircleNode *visit(const luci::CircleSelect *) final;
   luci::CircleNode *visit(const luci::CircleSelectV2 *) final;
   luci::CircleNode *visit(const luci::CircleShape *) final;
+  luci::CircleNode *visit(const luci::CircleSign *) final;
   luci::CircleNode *visit(const luci::CircleSin *) final;
   luci::CircleNode *visit(const luci::CircleSlice *) final;
   luci::CircleNode *visit(const luci::CircleSoftmax *) final;

compiler/luci/service/src/CircleShapeInferenceRule.cpp

@@ -2084,6 +2084,8 @@ class ShapeInferenceAlgorithm final : public luci::CircleNodeVisitor<loco::NodeS
 
   loco::NodeShape visit(const luci::CircleShape *node) final { return infer_shape(node); }
 
+  loco::NodeShape visit(const luci::CircleSign *node) final { return use_x(node); }
+
   loco::NodeShape visit(const luci::CircleSin *node) final { return use_x(node); }
 
   loco::NodeShape visit(const luci::CircleSlice *node) final { return infer_slice(node); }

compiler/luci/service/src/CircleTypeInferenceRule.cpp

@@ -450,6 +450,8 @@ struct TypeInferenceAlgorithm final : public luci::CircleNodeVisitor<loco::DataT
 
   loco::DataType visit(const luci::CircleShape *node) final { return node->out_type(); }
 
+  loco::DataType visit(const luci::CircleSign *node) final { return luci::dtype_get(node->x()); }
+
   loco::DataType visit(const luci::CircleSin *node) final { return luci::dtype_get(node->x()); }
 
   loco::DataType visit(const luci::CircleSlice *node) final

compiler/luci/service/src/Nodes/CircleSign.cpp

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2026 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "CircleCloneNode.h"
+
+namespace luci
+{
+
+luci::CircleNode *CloneNodeLet<CN::STUV>::visit(const luci::CircleSign *)
+{
+  return _graph->nodes()->create<luci::CircleSign>();
+}
+
+} // namespace luci

compiler/luci/service/src/Nodes/CircleSign.test.cpp

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2026 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "luci/Service/CircleNodeClone.h"
+
+#include <gtest/gtest.h>
+
+TEST(CloneNodeTest, clone_Sign)
+{
+  auto g = loco::make_graph();
+  auto node_sign = g->nodes()->create<luci::CircleSign>();
+
+  auto gc = loco::make_graph();
+  auto cloned = luci::clone_node(node_sign, gc.get());
+  ASSERT_NE(nullptr, cloned);
+  ASSERT_EQ(gc.get(), cloned->graph());
+
+  auto cloned_sign = dynamic_cast<luci::CircleSign *>(cloned);
+  ASSERT_NE(nullptr, cloned_sign);
+}