[Bug middle-end/54782] New: [4.8 Regression] ICE: in change_scope, at final.c:1543 with -O -ffast-math -ftree-parallelize-loops=2 -g

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54782

             Bug #: 54782
           Summary: [4.8 Regression] ICE: in change_scope, at final.c:1543
                    with -O -ffast-math -ftree-parallelize-loops=2 -g
    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 28330
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28330
reduced testcase

Compiler output:
$ gcc -O -ffast-math -ftree-parallelize-loops=2 -g testcase.c         
testcase.c: In function 'foo._loopfn.0':
testcase.c:12:3: internal compiler error: in change_scope, at final.c:1543
   for (i = 0; i < s->n; i++)
   ^
0x7980ea change_scope
        /mnt/svn/gcc-trunk/gcc/final.c:1543
0x79d68c reemit_insn_block_notes
        /mnt/svn/gcc-trunk/gcc/final.c:1613
0x79d68c final_start_function(rtx_def*, _IO_FILE*, int)
        /mnt/svn/gcc-trunk/gcc/final.c:1670
0x7a0585 rest_of_handle_final
        /mnt/svn/gcc-trunk/gcc/final.c:4291
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:
r191953 - crash
r191586 - crash
4.7 r191640 - OK