[Bug middle-end/58134] -ftree-vectorizer-verbose= shows vectroiyed loops only for N== 1 and N >2 but not for N==2

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58134

--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> ---
The reason is the following:
          dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, vect_location,
                           "Vectorized loop\n");

And in opts-global.c's dump_remap_tree_vectorizer_verbose:
  switch (value)
    {
    case 0:
      break;
    case 1:
      remapped_opt_info = "optimized";
      break;
    case 2:
      remapped_opt_info = "missed";
      break;
    default:
      remapped_opt_info = "all";
      break;
    }

And dumpfile.h:
#define MSG_OPTIMIZED_LOCATIONS  (1 << 26)  /* -fopt-info optimized sources */
#define MSG_MISSED_OPTIMIZATION  (1 << 27)  /* missed opportunities */
#define MSG_NOTE                 (1 << 28)  /* general optimization info */
#define MSG_ALL         (MSG_OPTIMIZED_LOCATIONS | MSG_MISSED_OPTIMIZATION \
                         | MSG_NOTE)