[Bug c++/80171] New: ICE (Segmentation fault) with optimization

[D.Bahadir at GMX dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80171

            Bug ID: 80171
           Summary: ICE (Segmentation fault) with optimization
           Product: gcc
           Version: 6.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: D.Bahadir at GMX dot de
  Target Milestone: ---

Created attachment 41041
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41041&action=edit
Testcase that yields segmentation fault when optimizing.

Compiling the attached (and reduced) test-case with any optimization yields a
segmentation fault.
Note however, that the original (non-reduced) test-case only segfault-ed with
"-O3" enabled.


The error:
----------

$ LANG=C /usr/bin/g++-6  -fpermissive -m64 -D_GLIBCXX_USE_CXX11_ABI=1
-std=c++14 -O3 -DNDEBUG -fPIC -c -w testcase.i -o /dev/null
testcase.i: In function 'void padis::isislistener::test()':
testcase.i:858:6: internal compiler error: Segmentation fault
 void test() {
      ^~~~
0xad48ef crash_signal
        ../../src/gcc/toplev.c:333
0xde8f98 generic_simplify_VIEW_CONVERT_EXPR
        /build/gcc-6-_9B9T1/gcc-6-6.2.0/build/gcc/generic-match.c:7580
0xde8f98 generic_simplify(unsigned int, tree_code, tree_node*, tree_node*)
        /build/gcc-6-_9B9T1/gcc-6-6.2.0/build/gcc/generic-match.c:9055
0x89a9cb fold_unary_loc(unsigned int, tree_code, tree_node*, tree_node*)
        ../../src/gcc/fold-const.c:7704
0x8cd81c fold_ctor_reference(tree_node*, tree_node*, unsigned long, unsigned
long, tree_node*)
        ../../src/gcc/gimple-fold.c:5508
0x8cdafa fold_array_ctor_reference
        ../../src/gcc/gimple-fold.c:5415
0x8cdafa fold_ctor_reference(tree_node*, tree_node*, unsigned long, unsigned
long, tree_node*)
        ../../src/gcc/gimple-fold.c:5533
0x8cde81 fold_const_aggregate_ref_1(tree_node*, tree_node* (*)(tree_node*))
        ../../src/gcc/gimple-fold.c:5641
0x8ce94d gimple_fold_stmt_to_constant_1(gimple*, tree_node* (*)(tree_node*),
tree_node* (*)(tree_node*))
        ../../src/gcc/gimple-fold.c:5119
0xc16396 try_to_simplify
        ../../src/gcc/tree-ssa-sccvn.c:3634
0xc16396 visit_use
        ../../src/gcc/tree-ssa-sccvn.c:3687
0xc184b5 process_scc
        ../../src/gcc/tree-ssa-sccvn.c:3975
0xc184b5 extract_and_process_scc_for_name
        ../../src/gcc/tree-ssa-sccvn.c:4062
0xc184b5 DFS
        ../../src/gcc/tree-ssa-sccvn.c:4114
0xc18d17 sccvn_dom_walker::before_dom_children(basic_block_def*)
        ../../src/gcc/tree-ssa-sccvn.c:4596
0x1059e02 dom_walker::walk(basic_block_def*)
        ../../src/gcc/domwalk.c:265
0xc19b02 run_scc_vn(vn_lookup_kind)
        ../../src/gcc/tree-ssa-sccvn.c:4707
0xbf2d24 execute
        ../../src/gcc/tree-ssa-pre.c:4910
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-6/README.Bugs> for instructions.


The test-system:
----------------

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.2 LTS
Release:        16.04
Codename:       xenial

$ uname -a
Linux My-Notebook 4.4.0-66-generic #87-Ubuntu SMP Fri Mar 3 15:29:05 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux


The compiler-version:
---------------------

$ /usr/bin/g++-6  --version
g++-6 (Ubuntu 6.2.0-3ubuntu11~16.04) 6.2.0 20160901
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.