[Bug tree-optimization/77778] New: ICE at -Os and above on x86_64-linux-gnu in both 32-bit and 64-bit modes (Segmentation fault, visit_reference_op_store, extract_and_process_scc_for_name)

[chengniansun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77778

            Bug ID: 77778
           Summary: ICE at -Os and above on x86_64-linux-gnu in both
                    32-bit and 64-bit modes (Segmentation fault,
                    visit_reference_op_store,
                    extract_and_process_scc_for_name)
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chengniansun at gmail dot com
  Target Milestone: ---

$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20160928 (experimental) [trunk revision 240565] (GCC) 
$ 
$ gcc-trunk -O3 small.c 
small.c: In function ‘main’:
small.c:5:5: warning: assignment discards ‘const’ qualifier from pointer target
type [-Wdiscarded-qualifiers]
   c = &a;
     ^
small.c:4:5: internal compiler error: Segmentation fault
 int main() {
     ^~~~
0xbd143f crash_signal
        ../../gcc-source-trunk/gcc/toplev.c:337
0xda517d visit_reference_op_store
        ../../gcc-source-trunk/gcc/tree-ssa-sccvn.c:3613
0xda517d visit_use
        ../../gcc-source-trunk/gcc/tree-ssa-sccvn.c:3858
0xda675c process_scc
        ../../gcc-source-trunk/gcc/tree-ssa-sccvn.c:4111
0xda675c extract_and_process_scc_for_name
        ../../gcc-source-trunk/gcc/tree-ssa-sccvn.c:4198
0xda675c DFS
        ../../gcc-source-trunk/gcc/tree-ssa-sccvn.c:4250
0xda6e55 sccvn_dom_walker::before_dom_children(basic_block_def*)
        ../../gcc-source-trunk/gcc/tree-ssa-sccvn.c:4716
0x128aed7 dom_walker::walk(basic_block_def*)
        ../../gcc-source-trunk/gcc/domwalk.c:265
0xda8532 run_scc_vn(vn_lookup_kind)
        ../../gcc-source-trunk/gcc/tree-ssa-sccvn.c:4827
0xd7d345 execute
        ../../gcc-source-trunk/gcc/tree-ssa-pre.c:5021
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.
$ 
$ cat small.c
static const int a;
int b;
int *c, *d;
int main() {
  c = &a;
  c == d ?: __builtin_abort(); 
  for (; b; b++ >= (*d = a))
    ;
  return 0;
}

$