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#include "tensorflow/tsl/platform/setround.h"
17
18#include "tensorflow/tsl/platform/logging.h"
19
20namespace tsl {
21namespace port {
22
23#if defined(TF_BROKEN_CFENV)
24
25ScopedSetRound::ScopedSetRound(const int mode) : original_mode_(mode) {
26 // If cfenv usage is broken, assume support only for TONEAREST.
27 DCHECK_EQ(mode, FE_TONEAREST);
28}
29
30ScopedSetRound::~ScopedSetRound() {}
31
32#else
33
34ScopedSetRound::ScopedSetRound(const int mode) {
35 original_mode_ = std::fegetround();
36 if (original_mode_ < 0) {
37 // Failed to get current mode, assume ROUND TO NEAREST.
38 original_mode_ = FE_TONEAREST;
39 }
40 std::fesetround(mode);
41}
42
43ScopedSetRound::~ScopedSetRound() { std::fesetround(original_mode_); }
44
45#endif // TF_BROKEN_CFENV
46
47} // namespace port
48} // namespace tsl
49