Message ID | 1321566913.8437.7.camel@gnopaine |
---|---|
State | New |
Headers | show |
On Thu, Nov 17, 2011 at 10:55 PM, William J. Schmidt <wschmidt@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 <wschmidt@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. */ > > >
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. */