[Bug fortran/57802] New: Waste work in set_loop_bounds()

[pchang9 at cs dot wisc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57802

            Bug ID: 57802
           Summary: Waste work in set_loop_bounds()
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          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 "set_loop_bounds()" in gcc/fortran/trans-array.c, the loop on line
4456 should break immediately after "nonoptional_arr" is set to "true". All the
iterations after "nonoptional_arr" set to "true" do not perform any useful
work, at best they just set "nonoptional_arr" again to "true".