message: __clz() available since Fermi
diff: @@ -24,7 +24,7 @@ namespace detail
  inline unsigned clz(unsigned val)
  {
  -#if defined(__CUDA_ARCH__) && __CUDA_ARCH__ > 0 // TODO: clz since Fermi
  +#if defined(__CUDA_ARCH__) && __CUDA_ARCH__ >= 200
  return __clz(val);
  #else
  return __builtin_clz(val);
  