tensorflow/core/platform/setround.h

/* Copyright 2015 The TensorFlow Authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==============================================================================*/

#ifndef TENSORFLOW_CORE_PLATFORM_SETROUND_H_
#define TENSORFLOW_CORE_PLATFORM_SETROUND_H_

#if defined(__ANDROID_API__) && (__ANDROID_API__ < 21)
// The <cfenv> header is broken pre-API 21 for several NDK releases.
#define TF_BROKEN_CFENV
#endif

#if defined(TF_BROKEN_CFENV)
#include <fenv.h>  // NOLINT
#else
#include <cfenv>  // NOLINT
#endif

#include "tensorflow/core/platform/macros.h"

namespace tensorflow {
namespace port {

// While this class is active, floating point rounding mode is set to the given
// mode. The mode can be one of the modes defined in <cfenv>, i.e. FE_DOWNWARD,
// FE_TONEAREST, FE_TOWARDZERO, or FE_UPWARD. The destructor restores the
// original rounding mode if it could be determined. If the original rounding
// mode could not be determined, the destructor sets it to FE_TONEAREST.
class ScopedSetRound {
 public:
  ScopedSetRound(int mode);
  ~ScopedSetRound();

 private:
  int original_mode_;

  TF_DISALLOW_COPY_AND_ASSIGN(ScopedSetRound);
};

}  // namespace port
}  // namespace tensorflow

#endif  // TENSORFLOW_CORE_PLATFORM_SETROUND_H_