// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level
// directory of this distribution and at http://opencv.org/license.html.

#ifndef OPENCV_CORE_FP_CONTROL_UTILS_HPP
#define OPENCV_CORE_FP_CONTROL_UTILS_HPP

namespace cv {

namespace details {

struct FPDenormalsModeState {
  uint32_t reserved[16]; // 64-bytes
}; // FPDenormalsModeState

CV_EXPORTS void setFPDenormalsIgnoreHint(bool ignore,
                                         CV_OUT FPDenormalsModeState &state);
CV_EXPORTS int saveFPDenormalsState(CV_OUT FPDenormalsModeState &state);
CV_EXPORTS bool restoreFPDenormalsState(const FPDenormalsModeState &state);

class FPDenormalsIgnoreHintScope {
public:
  inline explicit FPDenormalsIgnoreHintScope(bool ignore = true) {
    details::setFPDenormalsIgnoreHint(ignore, saved_state);
  }

  inline explicit FPDenormalsIgnoreHintScope(
      const FPDenormalsModeState &state) {
    details::saveFPDenormalsState(saved_state);
    details::restoreFPDenormalsState(state);
  }

  inline ~FPDenormalsIgnoreHintScope() {
    details::restoreFPDenormalsState(saved_state);
  }

protected:
  FPDenormalsModeState saved_state;
}; // FPDenormalsIgnoreHintScope

class FPDenormalsIgnoreHintScopeNOOP {
public:
  inline FPDenormalsIgnoreHintScopeNOOP(bool ignore = true) {
    CV_UNUSED(ignore);
  }
  inline FPDenormalsIgnoreHintScopeNOOP(const FPDenormalsModeState &state) {
    CV_UNUSED(state);
  }
  inline ~FPDenormalsIgnoreHintScopeNOOP() {}
}; // FPDenormalsIgnoreHintScopeNOOP

} // namespace details

// Should depend on target compilation architecture only
// Note: previously added archs should NOT be removed to preserve ABI
// compatibility
#if defined(OPENCV_SUPPORTS_FP_DENORMALS_HINT)
  // preserve configuration overloading through ports
#elif defined(__i386__) || defined(__x86_64__) || defined(_M_X64) ||           \
    defined(_X86_)
typedef details::FPDenormalsIgnoreHintScope FPDenormalsIgnoreHintScope;
#define OPENCV_SUPPORTS_FP_DENORMALS_HINT 1
#else
#define OPENCV_SUPPORTS_FP_DENORMALS_HINT 0
typedef details::FPDenormalsIgnoreHintScopeNOOP FPDenormalsIgnoreHintScope;
#endif

} // namespace cv

#endif // OPENCV_CORE_FP_CONTROL_UTILS_HPP