[Bug tree-optimization/108782] [13 Regression] ICE in add_phi_arg, at tree-phinodes.cc:359

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108782

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
We're applying outer loop vectorization but the nested cycle isn't vectorizable
because we run into

      if (!flow_bb_inside_loop_p (loop, gimple_bb (use_stmt)))
        {
          if (dump_enabled_p ())
            dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
                             "intermediate value used outside loop.\n");

          return NULL;
        }

but I think that's premature.  Still vectorizing it as first order recurrence
isn't possible either.

Testing a patch.