[Bug middle-end/57805] New: Waste work in write_roots()

[pchang9 at cs dot wisc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57805

            Bug ID: 57805
           Summary: Waste work in write_roots()
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pchang9 at cs dot wisc.edu
                CC: nistor1 at illinois dot edu

The problem appears in revision 200588 in version 4.9.

In method "write_roots()" in gcc/gengtype.c, the loop on line 4682 should break
immediately after "skip_p" is set to "1". All the iterations after "skip_p" set
to "1" do not perform any useful work, at best they just set "skip_p" again to
"1".