https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87896
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-11-06
Ever confirmed|0 |1
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Looks like a latent issue? We have EDGE_IGNORE set on edges so
if ((e->flags & ~(EDGE_DFS_BACK
| EDGE_CAN_FALLTHRU
| EDGE_IRREDUCIBLE_LOOP
| EDGE_LOOP_EXIT
| EDGE_CROSSING
| EDGE_PRESERVE)) == 0)
n_branch++;
doesn't count them. The flag is set by
vr-values.c:simplify_switch_using_ranges
but never reset.
/* An edge we should ignore. It should be entirely local to
passes. ie, it is never set on any edge upon the completion
of any pass. */
DEF_EDGE_FLAG(IGNORE, 17)
We could clear the flag in vr_values::~vr_values, but not sure if that's
the best thing to do. VRP and DOM could do that as well. tree-vrp.c
used to clear EDGE_IGNORE but the issue must be that we somehow _do_
thread (and copy) those edges?!
That is, we seem to look at EDGE_IGNORE only in thread_outgoing_edges but
appearantly not on all edges included in a threading path? As said edges
marked this way are determined to be never executed.
Jeff?
