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From: "paulo@matos-sorge.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/58463] New: ICE with -fdump-tree-all-all in vector indexed access
Date: Wed, 18 Sep 2013 15:12:00 -0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 4.8.1
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X-Bugzilla-Who: paulo@matos-sorge.com
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58463

            Bug ID: 58463
           Summary: ICE with -fdump-tree-all-all in vector indexed access
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: paulo@matos-sorge.com

Created attachment 30855
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30855&action=edit
Code example to reproduce ICE

GCC tries to access varmap through get_varinfo in tree-ssa-structalias.c, but
it fails with an ICE.

I have attached a reduced code example to reproduce the problem.

The command line and output with 4.8.1 is:
$ ~/work/tmp/gcc-4.8.1/gcc/cc1 -fpreprocessed -fdump-tree-all-all -O2
core_list_join.i 
core_list_join.i:4:1: warning: no semicolon at end of struct or union [enabled
by default]
 }
 ^
 fn1
Analyzing compilation unit
Performing interprocedural optimizations
 <*free_lang_data> <visibility> <early_local_cleanups>
core_list_join.i: In function 'fn1':
core_list_join.i:9:1: internal compiler error: in operator[], at vec.h:815
 }
 ^
0xbfd572 vec<variable_info*, va_heap, vl_embed>::operator[](unsigned int)
        /home/pmatos/work/gcc-releases/gcc-4.8.1/gcc/vec.h:815
0xbfcea0 vec<variable_info*, va_heap, vl_ptr>::operator[](unsigned int)
        /home/pmatos/work/gcc-releases/gcc-4.8.1/gcc/vec.h:1244
0xbeb5ba get_varinfo
        /home/pmatos/work/gcc-releases/gcc-4.8.1/gcc/tree-ssa-structalias.c:319
0xbefa59 perform_var_substitution
       
/home/pmatos/work/gcc-releases/gcc-4.8.1/gcc/tree-ssa-structalias.c:2244
0xbfb279 solve_constraints
       
/home/pmatos/work/gcc-releases/gcc-4.8.1/gcc/tree-ssa-structalias.c:6569
0xbfb679 compute_points_to_sets
       
/home/pmatos/work/gcc-releases/gcc-4.8.1/gcc/tree-ssa-structalias.c:6665
0xbfbdca compute_may_aliases()
       
/home/pmatos/work/gcc-releases/gcc-4.8.1/gcc/tree-ssa-structalias.c:6814
0x967b9e execute_function_todo
        /home/pmatos/work/gcc-releases/gcc-4.8.1/gcc/passes.c:1941
0x966f88 do_per_function
        /home/pmatos/work/gcc-releases/gcc-4.8.1/gcc/passes.c:1701
0x967d64 execute_todo
        /home/pmatos/work/gcc-releases/gcc-4.8.1/gcc/passes.c:1996
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.