1 /* Copyright 2015 The TensorFlow Authors. All Rights Reserved.
2 
3 Licensed under the Apache License, Version 2.0 (the "License");
4 you may not use this file except in compliance with the License.
5 You may obtain a copy of the License at
6 
7     http://www.apache.org/licenses/LICENSE-2.0
8 
9 Unless required by applicable law or agreed to in writing, software
10 distributed under the License is distributed on an "AS IS" BASIS,
11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 See the License for the specific language governing permissions and
13 limitations under the License.
14 ==============================================================================*/
15 
16 #include "tensorflow/core/platform/setround.h"
17 
18 #include "tensorflow/core/platform/logging.h"
19 
20 namespace tensorflow {
21 namespace port {
22 
23 #if defined(TF_BROKEN_CFENV)
24 
ScopedSetRound(const int mode)25 ScopedSetRound::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 
~ScopedSetRound()30 ScopedSetRound::~ScopedSetRound() {}
31 
32 #else
33 
34 ScopedSetRound::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 
43 ScopedSetRound::~ScopedSetRound() { std::fesetround(original_mode_); }
44 
45 #endif  // TF_BROKEN_CFENV
46 
47 }  // namespace port
48 }  // namespace tensorflow
49