[Bug testsuite/109596] [14 Regression] Lots of guality testcase fails on x86_64 after r14-162-gcda246f8b421ba

["jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109596

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #9)
> BTW, just curious, r14-162 had:
>        /* Ensure that the header will have just the latch as a predecessor
>          inside the loop.  */
> -      if (!single_pred_p (exit->dest))
> +      if (!single_pred_p (nonexit->dest))
>         {
> -         header = split_edge (exit);
> +         header = split_edge (nonexit);
>           exit = single_pred_edge (header);
>         }
> chunk, shouldn't that be nonexit = single_pred_edge (header); or is that
> line correct?

Regarding that, e.g. gcc.c-torture/compile/pr70199.c testcase at -O1 -g shows
both cases, once where single_pred_p (nonexit->dest) and once where
!single_pred_p (nonexit->dest) and we split the nonexit edge.
Or the !single_pred_p case is also in c-c++-common/gomp/pr59917-2.c,
gcc.dg/torture/pr83685.c.