1 files changed, 127 insertions, 0 deletions
diff --git a/compiler/moco-tf/src/Canonicalization/ConstCanonicalizer.cpp b/compiler/moco-tf/src/Canonicalization/ConstCanonicalizer.cpp
new file mode 100644
index 000000000..60629cd5a
--- /dev/null
+++ b/compiler/moco-tf/src/Canonicalization/ConstCanonicalizer.cpp
@@ -0,0 +1,127 @@
+/*
+ * Copyright (c) 2019 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 "ConstCanonicalizer.h"
+
+#include <moco/IR/TFDialect.h>
+
+#include <moco/Names.h>
+#include <moco/Log.h>
+
+#include <oops/UserExn.h>
+
+namespace
+{
+
+bool canonicalize_const(loco::Graph *graph, moco::TFConst *node)
+{
+  LOGGER(l);
+
+  /**
+   * @note This will replace TFConst node with Canonical Const
+   *
+   *       Before
+   *                 TFConst -- C
+   *
+   *       After
+   *                 TFConst -
+   *                 ConstGen -- C
+   *
+   *       Where
+   *                 C : a node that uses TFConst as an input
+   *                 TFConst is disconnected from other nodes
+   */
+
+  INFO(l) << "TFNodeCanonicalize TFConst begin";
+
+  auto const_node = graph->nodes()->create<loco::ConstGen>();
+
+  // copy properties
+  auto dtype = node->dtype();
+  const_node->dtype(dtype);
+
+  auto rank = node->rank();
+
+  if (rank == 0)
+  {
+    // This routine implements a workaround that converts a scalar constant (rank-0 tensor)
+    // into a rank-1 tensor of shape [1].
+    //
+    // TODO Revise this implementation later
+    const_node->rank(1);
+    const_node->dim(0) = 1;
+  }
+  else
+  {
+    const_node->rank(rank);
+
+    for (uint32_t r = 0; r < rank; ++r)
+    {
+      if (node->dim(r).known())
+        const_node->dim(r) = node->dim(r);
+      else
+        const_node->dim(r).unset();
+    }
+  }
+
+  switch (dtype)
+  {
+    case loco::DataType::S32:
+    {
+      uint32_t input_elements = node->size<loco::DataType::S32>();
+      const_node->size<loco::DataType::S32>(input_elements);
+      for (uint32_t i = 0; i < input_elements; ++i)
+      {
+        const_node->at<loco::DataType::S32>(i) = node->at<loco::DataType::S32>(i);
+      }
+      break;
+    }
+    case loco::DataType::FLOAT32:
+    {
+      uint32_t input_elements = node->size<loco::DataType::FLOAT32>();
+      const_node->size<loco::DataType::FLOAT32>(input_elements);
+      for (uint32_t i = 0; i < input_elements; ++i)
+      {
+        const_node->at<loco::DataType::FLOAT32>(i) = node->at<loco::DataType::FLOAT32>(i);
+      }
+      break;
+    }
+    default:
+      throw oops::UserExn("Const has unsupported data type", node->name());
+  }
+
+  // update graph
+  replace(node).with(const_node);
+
+  INFO(l) << "TFNodeCanonicalize TFConst done";
+
+  return true;
+}
+
+} // namespace
+
+namespace moco
+{
+namespace tf
+{
+
+bool ConstCanonicalizer::transform(TFConst *node) const
+{
+  return canonicalize_const(node->graph(), node);
+}
+
+} // namespace tf
+} // namespace moco