[Bug tree-optimization/69887] New: gcc ICE at -O1 and above on x86_64-linux-gnu in mark_jump_label_1

[helloqirun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69887

            Bug ID: 69887
           Summary: gcc ICE at -O1 and above on x86_64-linux-gnu in
                    mark_jump_label_1
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: helloqirun at gmail dot com
  Target Milestone: ---

The following code causes an ICE when compiled with the current gcc trunk at
-O1 and above on x86_64-linux-gnu in both 32-bit and 64-bit modes.

It affects gcc-4.6 to trunk.


$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 6.0.0 20160220 (experimental) [trunk revision 233587] (GCC)





$ gcc-trunk -O1 abc.c
abc.c: In function 'main':
abc.c:6:1: internal compiler error: in mark_jump_label_1, at jump.c:1159
 }
 ^
0x9d50a9 mark_jump_label_1
        ../../gcc/gcc/jump.c:1159
0x9d4e8a mark_jump_label_1
        ../../gcc/gcc/jump.c:1219
0x9d5485 mark_all_labels
        ../../gcc/gcc/jump.c:313
0x9d5485 rebuild_jump_labels_1
        ../../gcc/gcc/jump.c:75
0x11da8c1 rest_of_handle_cse
        ../../gcc/gcc/cse.c:7538
0x11da8c1 execute
        ../../gcc/gcc/cse.c:7572
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 abc.c
int a[1];
int main() {
  __builtin_setjmp(a);
  __builtin_longjmp(a, 1);
  return 0;
}