[Bug tree-optimization/39305] New: tree-ssa-loop-ch.c:copy_loop_headers performs loop unrolling

["amylaar at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

For some simple loops with early exits, like libgcc2.c:__gcc_bcmp,
copy_loop_headers copies not only the header, but also the loop body,
and thus disables doloop optimizations.


-- 
           Summary: tree-ssa-loop-ch.c:copy_loop_headers performs loop
                    unrolling
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: amylaar at gcc dot gnu dot org
 BugsThisDependsOn: 39302


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39305