regex: elide needless increments of visited counter.

* regex.c (nfa_run): Start with the existing value of the
visited counter and pre-increment it when calling nfa_closure
and nfa_move_closure. Thus it is incremented only as many
times as those functions are called: one fewer than before.
(regex_machine_reset): regm->n.visited is already incremented,
since 1 was added to the prior value; there is no need to
increment it again.
(nfa_handle_wraparound): More prudent approach here.
If we get within 8 increments of wraparound, we
fast forward to UINT_MAX and then 0.

0 files changed, 0 insertions, 0 deletions