1/* Copyright 2015 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15
16#ifndef TENSORFLOW_TSL_PLATFORM_SETROUND_H_
17#define TENSORFLOW_TSL_PLATFORM_SETROUND_H_
18
19#if defined(__ANDROID_API__) && (__ANDROID_API__ < 21)
20// The <cfenv> header is broken pre-API 21 for several NDK releases.
21#define TF_BROKEN_CFENV
22#endif
23
24#if defined(TF_BROKEN_CFENV)
25#include <fenv.h> // NOLINT
26#else
27#include <cfenv> // NOLINT
28#endif
29
30#include "tensorflow/tsl/platform/macros.h"
31
32namespace tsl {
33namespace port {
34
35// While this class is active, floating point rounding mode is set to the given
36// mode. The mode can be one of the modes defined in <cfenv>, i.e. FE_DOWNWARD,
37// FE_TONEAREST, FE_TOWARDZERO, or FE_UPWARD. The destructor restores the
38// original rounding mode if it could be determined. If the original rounding
39// mode could not be determined, the destructor sets it to FE_TONEAREST.
40class ScopedSetRound {
41 public:
42 ScopedSetRound(int mode);
43 ~ScopedSetRound();
44
45 private:
46 int original_mode_;
47
48 TF_DISALLOW_COPY_AND_ASSIGN(ScopedSetRound);
49};
50
51} // namespace port
52} // namespace tsl
53
54#endif // TENSORFLOW_TSL_PLATFORM_SETROUND_H_
55