netgen/libsrc/core/utils.hpp

#ifndef NETGEN_CORE_UTILS_HPP
#define NETGEN_CORE_UTILS_HPP

#include <chrono>
#include <sstream>
#include <string>

#ifdef WIN32
#include <intrin.h>   // for __rdtsc()  CPU time step counter
#else
#include <x86intrin.h>   // for __rdtsc()  CPU time step counter
#endif // WIN32

#include "ngcore_api.hpp"       // for NGCORE_API

namespace ngcore
{
  // MPI rank, nranks TODO: Rename
  extern NGCORE_API int id, ntasks;
  
  NGCORE_API std::string Demangle(const char* typeinfo);

#if defined(__GNUC__)
  inline bool likely (bool x) { return bool(__builtin_expect(long(x), 1L)); }
  inline bool unlikely (bool x) { return bool(__builtin_expect(long(x), 0L)); }
#else
  inline bool likely (bool x) { return x; }
  inline bool unlikely (bool x) { return x; }
#endif

  using TClock = std::chrono::system_clock;
  extern NGCORE_API const std::chrono::time_point<TClock> wall_time_start;

  // Time in seconds since program start
  inline double WallTime () noexcept
  {
      std::chrono::time_point<TClock> now = TClock::now();
      std::chrono::duration<double> elapsed_seconds = now-wall_time_start;
      return elapsed_seconds.count();
  }

  // High precision clock counter register
  using TTimePoint = size_t;
  extern NGCORE_API double ticks_per_second;

  inline TTimePoint GetTimeCounter() noexcept
  {
      return TTimePoint(__rdtsc());
  }

  template <class T>
  inline std::string ToString (const T& t)
  {
      std::stringstream ss;
      ss << t;
      return ss.str();
  }


} // namespace ngcore

#endif // NETGEN_CORE_UTILS_HPP