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/*
* 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 "moco/Pass/Passes/ConstantFoldAdd.h"
#include "ConstantFoldHelper.h"
#include <moco/IR/Nodes/TFAdd.h>
#include <moco/IR/Nodes/TFConst.h>
#include <moco/Support/NodeAs.h>
namespace
{
struct Func final : public moco::BinaryFunc
{
float apply(float lhs, float rhs) const { return lhs + rhs; }
int32_t apply(int32_t lhs, int32_t rhs) const { return lhs + rhs; }
};
bool constantfold_add(moco::TFAdd *node)
{
auto x_const = moco::as<moco::TFConst>(node->x());
auto y_const = moco::as<moco::TFConst>(node->y());
if (x_const == nullptr || y_const == nullptr)
return false;
if (x_const->dtype() != y_const->dtype())
return false;
// TODO support other types
if (x_const->dtype() != loco::DataType::S32 && x_const->dtype() != loco::DataType::FLOAT32)
return false;
// NOTE we support limited shape of elementwise add or add with a scalar.
// valid_shape_for_constfold_binary_op() explains limited shape.
auto x_shape = moco::tensor_shape(x_const);
auto y_shape = moco::tensor_shape(y_const);
if (!moco::valid_shape_for_constfold_binary_op(x_shape, y_shape))
return false;
loco::TensorShape output_shape;
if (y_shape.rank() == 0 || y_shape.rank() == 1)
output_shape = x_shape;
else
output_shape = y_shape;
auto graph = node->graph();
auto output_const = moco::new_const(graph, output_shape, x_const->dtype());
Func f;
if (x_const->dtype() == loco::DataType::S32)
{
moco::apply_binary<int32_t>(x_const, y_const, output_const, f);
}
else if (x_const->dtype() == loco::DataType::FLOAT32)
{
moco::apply_binary<float>(x_const, y_const, output_const, f);
}
// replace
loco::replace(node).with(output_const);
return true;
}
} // namespace
namespace moco
{
/**
* @note This will Replace TFAdd with TFConst when inputs are TFConst
*
* Before
* A --- TFAdd --- C
* B --/
* After
* A --- TFAdd
* B --/
* TFConst ---------- C
* Where
* A,B : inputs of TFAdd
* C : a node that uses TFAdd as an input
* TFAdd is disconnected from C
* Nodes are drawn multiple times to simplify the diagram
*/
bool ConstantFoldAdd::run(loco::Graph *graph)
{
bool changed = false;
for (auto node : loco::active_nodes(loco::output_nodes(graph)))
{
if (auto add_node = as<moco::TFAdd>(node))
{
if (constantfold_add(add_node))
changed = true;
}
}
return changed;
}
} // namespace moco
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