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 #ifndef TENSORFLOW_CORE_PLATFORM_SETROUND_H_ 17 #define TENSORFLOW_CORE_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/core/platform/macros.h" 31 32 namespace tensorflow { 33 namespace 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. 40 class 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 tensorflow 53 54 #endif // TENSORFLOW_CORE_PLATFORM_SETROUND_H_ 55