1 files changed, 64 insertions, 0 deletions
diff --git a/runtime/onert/core/src/compiler/pass/UnusedOperandEliminationPass.cc b/runtime/onert/core/src/compiler/pass/UnusedOperandEliminationPass.cc
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index 000000000..162c4e7ef
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+++ b/runtime/onert/core/src/compiler/pass/UnusedOperandEliminationPass.cc
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2021 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 "Pass.h"
+
+#include "UnusedOperandEliminationPass.h"
+#include "ir/Index.h"
+#include "util/Set.h"
+#include "ir/Graph.h"
+
+/**
+ * @file  UnusedOperandEliminationPass.cc
+ * @brief This file contains UnusedOperandEliminationPass class implementation
+ */
+
+namespace onert
+{
+namespace compiler
+{
+namespace pass
+{
+
+void UnusedOperandEliminationPass::run()
+{
+  util::Set<ir::OperandIndex> used;
+
+  _graph.operations().iterate([&](const ir::OperationIndex &, const ir::IOperation &node) {
+    for (auto &&ind : (node.getInputs() + node.getOutputs()) | ir::Remove::UNDEFINED)
+    {
+      used.add(ind);
+    }
+  });
+
+  // Graph's inputs/outputs are always considered as used
+  for (auto &&ind : (_graph.getInputs() + _graph.getOutputs()) | ir::Remove::UNDEFINED)
+  {
+    used.add(ind);
+  }
+
+  _graph.operands().iterate([&](const ir::OperandIndex &ind, const ir::Operand &) {
+    if (!used.contains(ind))
+    {
+      VERBOSE() << "Remove unused operand " << ind << std::endl;
+      _graph.operands().remove(ind);
+    }
+  });
+}
+
+} // namespace pass
+} // namespace compiler
+} // namespace onert