[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: unassig...@gcc.gnu.org

        ReportedBy: zso...@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