[Bug middle-end/54838] New: [4.8 Regression] ICE: in merge_latch_edges, at cfgloop.c:678 with -O2 -ftracer -fno-tree-dce -fno-tree-sra

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54838

             Bug #: 54838
           Summary: [4.8 Regression] ICE: in merge_latch_edges, at
                    cfgloop.c:678 with -O2 -ftracer -fno-tree-dce
                    -fno-tree-sra
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


Created attachment 28376
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28376
reduced testcase

Compiler output:
$ gcc -O2 -ftracer -fno-tree-dce -fno-tree-sra testcase.C
testcase.C: In function '_ForwardIterator1 search(_ForwardIterator1,
_ForwardIterator1)':
testcase.C:113:3: internal compiler error: in merge_latch_edges, at
cfgloop.c:678
   }
   ^
0x840a29 merge_latch_edges
        /mnt/svn/gcc-trunk/gcc/cfgloop.c:678
0x840a29 disambiguate_multiple_latches
        /mnt/svn/gcc-trunk/gcc/cfgloop.c:741
0x840a29 disambiguate_loops_with_multiple_latches()
        /mnt/svn/gcc-trunk/gcc/cfgloop.c:755
0xa49ed4 loop_optimizer_init(unsigned int)
        /mnt/svn/gcc-trunk/gcc/loop-init.c:78
0x12084de fwprop_init
        /mnt/svn/gcc-trunk/gcc/fwprop.c:1412
0x120869a fwprop
        /mnt/svn/gcc-trunk/gcc/fwprop.c:1459
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r192080 - crash
r191586 - crash
4.7 r191640 - OK