[Bug tree-optimization/87271] New: [9 Regression] ICE in rpo_elim::~rpo_elim (this=0xbfbfe15c, __in_chrg=<optimized out>) at ../../gcc/tree-ssa-sccvn.c:5709 on FreeBSD 10.4

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87271

            Bug ID: 87271
           Summary: [9 Regression] ICE in rpo_elim::~rpo_elim
                    (this=0xbfbfe15c, __in_chrg=<optimized out>) at
                    ../../gcc/tree-ssa-sccvn.c:5709 on FreeBSD 10.4
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: rguenth at gcc dot gnu.org
  Target Milestone: ---
              Host: i586-freebsd

That's follow-up of: https://gcc.gnu.org/ml/gcc-patches/2018-09/msg00501.html

I see following back-trace:

$ Starting program: /tmp/gcc3/objdir/gcc/cc1 -quiet -I . -I
../../../libbacktrace -I ../../../libbacktrace/../include -I
../../../libbacktrace/../libgcc -I ../libgcc -iprefix
/tmp/gcc3/objdir/gcc/../lib/gcc/i586-unknown-freebsd10.4/9.0.0/ -isystem
/tmp/gcc3/objdir/./gcc/include -isystem /tmp/gcc3/objdir/./gcc/include-fixed -D
HAVE_CONFIG_H -D PIC -isystem /usr/local/i586-unknown-freebsd10.4/include
-isystem /usr/local/i586-unknown-freebsd10.4/sys-include
../../../libbacktrace/elf.c -quiet -dumpbase elf.c -mtune=pentium
-march=pentium -auxbase-strip .libs/elf.o -g -O2 -Wextra -Wall -Wwrite-strings
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition
-Wsuggest-attribute=format -Wcast-qual -Werror -funwind-tables
-frandom-seed=elf.lo -fPIC -o /tmp//ccR4tmV8.s

Program received signal SIGSEGV, Segmentation fault.
0x2a59ebe8 in ?? () from /lib/libc.so.7
(gdb) bt
#0  0x2a59ebe8 in ?? () from /lib/libc.so.7
#1  0x2a59efb7 in ?? () from /lib/libc.so.7
#2  0x2a5aa90c in free () from /lib/libc.so.7
#3  0x085ced17 in va_heap::release<std::pair<int, int> > (v=@0x2b42801c:
0x2aefbf80) at ../../gcc/vec.h:307
#4  0x085ce59f in vec<std::pair<int, int>, va_heap, vl_ptr>::release
(this=0x2b42801c) at ../../gcc/vec.h:1675
#5  0x08ea9523 in rpo_elim::~rpo_elim (this=0xbfbfe15c, __in_chrg=<optimized
out>) at ../../gcc/tree-ssa-sccvn.c:5709
#6  0x08eac4a9 in do_rpo_vn (fn=0x2b1df340, entry=0x2b273b20, exit_bbs=0x0,
iterate=true, eliminate=false) at ../../gcc/tree-ssa-sccvn.c:6303
#7  0x08ea8dab in run_rpo_vn (kind=VN_WALK) at ../../gcc/tree-ssa-sccvn.c:5560
#8  0x08e722e1 in (anonymous namespace)::pass_pre::execute (this=0x2ac5d0c0,
fun=0x2b1df340) at ../../gcc/tree-ssa-pre.c:4199
#9  0x08ad607b in execute_one_pass (pass=0x2ac5d0c0) at ../../gcc/passes.c:2446
#10 0x08ad63b4 in execute_pass_list_1 (pass=0x2ac5d0c0) at
../../gcc/passes.c:2535
#11 0x08ad63e4 in execute_pass_list_1 (pass=0x2ac5b5c0) at
../../gcc/passes.c:2536
#12 0x08ad6430 in execute_pass_list (fn=0x2b1df340, pass=0x2ac5b480) at
../../gcc/passes.c:2546
#13 0x08637115 in cgraph_node::expand (this=0x2b20c320) at
../../gcc/cgraphunit.c:2121
#14 0x086376f0 in expand_all_functions () at ../../gcc/cgraphunit.c:2259
#15 0x08638189 in symbol_table::compile (this=0x2b0070c8) at
../../gcc/cgraphunit.c:2610
#16 0x0863858e in symbol_table::finalize_compilation_unit (this=0x2b0070c8) at
../../gcc/cgraphunit.c:2788
#17 0x08c33ea9 in compile_file () at ../../gcc/toplev.c:480
#18 0x08c36679 in do_compile () at ../../gcc/toplev.c:2170
#19 0x08c3694c in toplev::main (this=0xbfbfe4fe, argc=50, argv=0xbfbfe558) at
../../gcc/toplev.c:2305
#20 0x099dabda in main (argc=50, argv=0xbfbfe558) at ../../gcc/main.c:39