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  namespace {
  
  
  // The function is copied from _ConvertSMVer2Cores of
  // cuda-11.0/samples/common/inc/helper_cuda.h
  inline int convert_sm_ver_to_cores(int major, int minor)
  {
      // Defines for GPU Architecture types (using the SM version to determine
      // the # of cores per SM
      typedef struct {
          int SM;  // 0xMm (hexidecimal notation), M = SM Major version,
          // and m = SM minor version
          int Cores;
      } sSMtoCores;
  
      sSMtoCores nGpuArchCoresPerSM[] = {
          {0x30, 192},  // Kepler Generation (SM 3.0) GK10x class
          {0x32, 192},  // Kepler Generation (SM 3.2) GK10x class
          {0x35, 192},  // Kepler Generation (SM 3.5) GK11x class
          {0x37, 192},  // Kepler Generation (SM 3.7) GK21x class
          {0x50, 128},  // Maxwell Generation (SM 5.0) GM10x class
          {0x52, 128},  // Maxwell Generation (SM 5.2) GM20x class
          {0x53, 128},  // Maxwell Generation (SM 5.3) GM20x class
          {0x60, 64},   // Pascal Generation (SM 6.0) GP100 class
          {0x61, 128},  // Pascal Generation (SM 6.1) GP10x class
          {0x62, 128},  // Pascal Generation (SM 6.2) GP10x class
          {0x70, 64},   // Volta Generation (SM 7.0) GV100 class
          {0x72, 64},   // Volta Generation (SM 7.2) GV11b class
          {0x75, 64},   // Turing Generation (SM 7.5) TU1xx class
          {0x80, 64},   // Ampere Generation (SM 8.0) GA100 class
          {-1, -1}};
  
      int index = 0;
  
      while (nGpuArchCoresPerSM[index].SM != -1) {
          if (nGpuArchCoresPerSM[index].SM == ((major << 4) + minor)) {
              return nGpuArchCoresPerSM[index].Cores;
          }
          index++;
      }
  
  #if GKO_VERBOSE_LEVEL >= 1
      // If we don't find the values, we use the last valid value by default
      // to allow proper execution
      std::cerr << "MapSMtoCores for SM " << major << "." << minor
                << "is undefined. The default value of "
                << nGpuArchCoresPerSM[index - 1].Cores << " Cores/SM is used."
                << std::endl;
  #endif  // GKO_VERBOSE_LEVEL >= 1
      return nGpuArchCoresPerSM[index - 1].Cores;
  }
  
  
  }  // namespace
  