On Thu, Nov 17, 2011 at 10:55 PM, William J. Schmidt
<wschm...@linux.vnet.ibm.com> wrote:
> Greetings,
>
> While investigating http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39976, I
> found that tree-outof-ssa.c:insert_backedge_copies tests whether edges
> are back edges, but the back edges haven't been marked to facilitate
> this. (This was the reason the failures started happening in r149206,
> although fixing it doesn't take care of the problem in the current trunk
> revision because of the duplicate PHIs noted in the issue.)
>
> This simple patch updates the back edge information where it's needed.
> Bootstrapped and regression tested on powerpc64-linux. OK for trunk?
Ok.
Thanks,
Richard.
> Thanks,
> Bill
>
>
> 2011-11-17 Bill Schmidt <wschm...@linux.vnet.ibm.com>
>
> * tree-outof-ssa.c (insert_back_edge_copies): Add call to
> mark_dfs_back_edges.
>
>
>
> Index: gcc/tree-outof-ssa.c
> ===================================================================
> --- gcc/tree-outof-ssa.c (revision 181442)
> +++ gcc/tree-outof-ssa.c (working copy)
> @@ -1021,6 +1021,8 @@ insert_backedge_copies (void)
> basic_block bb;
> gimple_stmt_iterator gsi;
>
> + mark_dfs_back_edges ();
> +
> FOR_EACH_BB (bb)
> {
> /* Mark block as possibly needing calculation of UIDs. */
>
>
>
