1 files changed, 80 insertions, 0 deletions
diff --git a/compiler/luci/pass/src/RemoveRedundantDequantizePass.cpp b/compiler/luci/pass/src/RemoveRedundantDequantizePass.cpp
new file mode 100644
index 000000000..66cd9d791
--- /dev/null
+++ b/compiler/luci/pass/src/RemoveRedundantDequantizePass.cpp
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2022 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/Pass/RemoveRedundantDequantizePass.h"
+
+#include <luci/IR/CircleNodes.h>
+
+namespace
+{
+
+bool remove_redundant_dequant(luci::CircleDequantize *dequant)
+{
+  assert(dequant != nullptr);
+
+  auto prev = loco::must_cast<luci::CircleNode *>(dequant->input());
+  if (prev->dtype() != loco::DataType::FLOAT32)
+    return false;
+
+  replace(dequant).with(prev);
+
+  return true;
+}
+
+} // namespace
+
+namespace luci
+{
+/**
+ * Dequantize Op does the below things on the ifm.
+ * 1. Element-wise update of quantized values (u8/s16) to fp32 values
+ * 2. Update dtype to fp32
+ * If the previous node is not quantized, dequantize Op is redundant.
+ *
+ * BEFORE
+ *
+ *     [CircleNode (A)]
+ *            |
+ *     [CircleNode (B)] (fp32)
+ *            |
+ *    [CircleDequantize]
+ *            |
+ *       [CircleNode]
+ *
+ * AFTER
+ *
+ *     [CircleNode (A)]
+ *            |
+ *     [CircleNode (B)] (fp32)
+ *            |
+ *       [CircleNode]
+ */
+bool RemoveRedundantDequantizePass::run(loco::Graph *g)
+{
+  bool changed = false;
+  for (auto node : loco::active_nodes(loco::output_nodes(g)))
+  {
+    auto target_node = dynamic_cast<luci::CircleDequantize *>(node);
+    if (target_node != nullptr)
+    {
+      if (remove_redundant_dequant(target_node))
+        changed = true;
+    }
+  }
+  return changed;
+}
+
+} // namespace luci