1/*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19
20/*!
21 * \file fold_constant.h
22 * \brief Utility functions for folding constants in expressions.
23 */
24#ifndef TVM_RELAY_TRANSFORMS_FOLD_CONSTANT_H_
25#define TVM_RELAY_TRANSFORMS_FOLD_CONSTANT_H_
26
27#include <tvm/relay/expr.h>
28
29namespace tvm {
30namespace relay {
31namespace transform {
32
33/*!
34 * \brief Apply constant folding on an expression.
35 *
36 * \param expr The expression to fold.
37 * \param fold_qnn Whether to fold constants for QNN operations.
38 * \returns The new folded expression.
39 */
40Expr FoldConstantExpr(const Expr& expr, bool fold_qnn = true);
41
42/*!
43 * \brief Returns \p expr with any constants expressions evaluated and let-bound constants
44 * inlined. Returns \p expr unchanged if no change.
45 *
46 * CAUTION: The importers rely on this function returning \p expr unchanged to preserve sharing
47 * from their p.o.v. Furthermore, this function can be called before conversion to ANF so
48 * we must avoid all recursion.
49 */
50Expr FoldConstantExpr(const Expr& expr, const IRModule& mod, bool fold_qnn);
51
52} // namespace transform
53} // namespace relay
54} // namespace tvm
55#endif // TVM_RELAY_TRANSFORMS_FOLD_CONSTANT_H_
56