[Bug middle-end/49946] New: Thread jumps confuse loop unrolling

[izamyatin at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49946

           Summary: Thread jumps confuse loop unrolling
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: izamya...@gmail.com


Created attachment 24892
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24892
test for loop unrolling

I see exactly the case that was mentioned here -
http://gcc.gnu.org/ml/gcc/2010-01/msg00057.html:

exp_gcc/gcc -c -O3 test_unroll.c -fno-tree-dominator-opts performs complete
unroll and

exp_gcc/gcc -c -O3 test_unroll.c does not do the unroll