--- /dev/null
+/*
+ * 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 "FoldReshapeOfConst.h"
+
+#include "Check.h"
+
+#include "Dialect/IR/TFLNodes.h"
+#include "Dialect/IR/TFLNodeVisitor.h"
+
+#include <loco/IR/Nodes.h>
+#include <loco/Service/ShapeInference.h>
+
+namespace
+{
+
+/**
+ * @brief Check if node is TFLReshape and its input is TFLConst
+ * @return Casted TFLReshape for foldable candidate, nullptr otherwise
+ */
+locoex::TFLReshape *as_candidate(loco::Node *node)
+{
+ auto reshape = dynamic_cast<locoex::TFLReshape *>(node);
+ if (not reshape)
+ return nullptr;
+
+ // Only accept Constant input of Reshape
+ if (not dynamic_cast<locoex::TFLConst *>(reshape->tensor()))
+ return nullptr;
+
+ return reshape;
+}
+
+uint32_t volume(loco::Node *tensor_node)
+{
+ auto shape = loco::shape_get(tensor_node).as<loco::TensorShape>();
+
+ uint32_t vol = 1;
+ for (uint32_t axis = 0; axis < shape.rank(); ++axis)
+ vol *= shape.dim(axis).value();
+
+ return vol;
+}
+
+void fold_reshape_of_const(locoex::TFLReshape *reshape)
+{
+ const loco::DataType FLOAT32 = loco::DataType::FLOAT32;
+
+ auto const_orig = dynamic_cast<locoex::TFLConst *>(reshape->tensor());
+
+ // Exceptions
+ {
+ EXO_ASSERT(const_orig, "Only support for Reshape-Const pair");
+ // TODO support other data types
+ if (const_orig->dtype() != FLOAT32)
+ EXO_THROW("NYI for this data type");
+
+ if (volume(const_orig) != volume(reshape))
+ EXO_THROW("New shape of Reshape is not matched");
+ }
+
+ auto new_shape = loco::shape_get(reshape).as<loco::TensorShape>();
+
+ // TFLConst to replace
+ auto const_new = reshape->graph()->nodes()->create<locoex::TFLConst>();
+
+ const_new->dtype(FLOAT32);
+ const_new->rank(new_shape.rank());
+ const_new->size<FLOAT32>(const_orig->size<FLOAT32>());
+ for (uint32_t axis = 0; axis < new_shape.rank(); ++axis)
+ const_new->dim(axis) = new_shape.dim(axis);
+
+ for (uint32_t i = 0; i < const_new->size<FLOAT32>(); ++i)
+ {
+ const_new->at<FLOAT32>(i) = const_orig->at<FLOAT32>(i);
+ }
+
+ // replace
+ loco::replace(reshape).with(const_new);
+}
+
+} // namespace
+
+namespace exo
+{
+
+bool FoldReshapeOfConst::run(loco::Graph *g)
+{
+ bool changed = false;
+ for (auto node : loco::active_nodes(loco::output_nodes(g)))
+ {
+ if (auto reshape = as_candidate(node))
+ {
+ fold_reshape_of_const(reshape);
+ changed = true;
+ }
+ }
+
+ return changed;
+}
+
+} // namespace exo
--- /dev/null
+/*
+ * 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.
+ */
+
+#ifndef __PASS_FOLD_RESHAPE_OF_CONST_H__
+#define __PASS_FOLD_RESHAPE_OF_CONST_H__
+
+#include <logo/Pass.h>
+
+namespace exo
+{
+
+/**
+ * @brief Class to fuse TFLReshape + TFLConst into one equivalent TFLConst
+ *
+ * <before>
+ * TFLConst --- TFLReshape --- Out
+ *
+ * <after>
+ * TFLConst --- TFLReshape ---
+ * TFLConst (new) ------------ Out
+ *
+ * TODO This pass is for temporary. Deprecate this pass.
+ */
+struct FoldReshapeOfConst final : public logo::Pass
+{
+ const char *name(void) const final { return "exo::FoldReshapeOfConst"; }
+
+ bool run(loco::Graph *g) final;
+};
+
+} // namespace exo
+
+#endif // __PASS_FOLD_RESHAPE_OF_CONST_H__