[Bug tree-optimization/108601] [13 Regression] vector peeling ICEs with PGO + LTO + IPA inlining in gcc_r in SPEC2017

[crazylht at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108601

--- Comment #5 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Hongtao.liu from comment #4)
> So that would be case: the tripcount is known, the vect_factor is known, but
> still niters_vector_mult_vf is variable(or it's not fold into an constant).?

Maybe related to this tricky


      if (!integer_onep (*step_vector))
        {
          /* On exit from the loop we will have an easy way of calcalating
             NITERS_VECTOR / STEP * STEP.  Install a dummy definition
             until then.  */
          niters_vector_mult_vf = make_ssa_name (TREE_TYPE (*niters_vector));
          SSA_NAME_DEF_STMT (niters_vector_mult_vf) = gimple_build_nop ();
          *niters_vector_mult_vf_var = niters_vector_mult_vf;
        }
      else
        vect_gen_vector_loop_niters_mult_vf (loop_vinfo, *niters_vector,
                                             &niters_vector_mult_vf);