text: #ifndef ATL_ztGetNB_geqrf
  
  /*
   * NB selection for GEQRF: Side='RIGHT', Uplo='UPPER'
   * M : 25,149,211,273,521,1018,1515,2012,4000
   * N : 25,149,211,273,521,1018,1515,2012,4000
   * NB : 12,12,48,48,60,60,60,68,72
   */
  #define ATL_ztGetNB_geqrf(n_, nb_) \
  { \
     if ((n_) < 180) (nb_) = 12; \
     else if ((n_) < 397) (nb_) = 48; \
     else if ((n_) < 1763) (nb_) = 60; \
     else if ((n_) < 3006) (nb_) = 68; \
     else (nb_) = 72; \
  }
  
  
  #endif    /* end ifndef ATL_ztGetNB_geqrf */
  