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From: "shaohua.li at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/111917] New: ICE in as_a, at is-a.h:255 since
 GCC-8
Date: Sun, 22 Oct 2023 09:20:00 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: shaohua.li at inf dot ethz.ch
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111917

            Bug ID: 111917
           Summary: ICE in as_a, at is-a.h:255 since GCC-8
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: shaohua.li at inf dot ethz.ch
  Target Milestone: ---

gcc at -O3 crashed.

I didn't bisect this case because it affected even gcc-8.

Compiler explorer: https://godbolt.org/z/7Mz9G6Kro

$ cat a.c
long a() {
  long b, c;
  for (; b; b++)
    c <<=3D 1;
  return c;
}
static int d() {
e:
f:
  for (; a();)
    ;
  goto f;
  return 0;
}
int main() { d(); }
$
$ gcc -O3 a.c
during GIMPLE pass: unswitch
a.c: In function 'int main()':
a,c:15:5: internal compiler error: in as_a, at is-a.h:255
   15 | int main() { d(); }
      |     ^~~~
0x26259de internal_error(char const*, ...)
        ???:0
0xaf830e fancy_abort(char const*, int, char const*)
        ???:0
0x15b8af2 number_of_iterations_exit(loop*, edge_def*, tree_niter_desc*, boo=
l,
bool, basic_block_def**)
        ???:0
0x14fca28 number_of_latch_executions(loop*)
        ???:0
0x15ba69d estimate_numbers_of_iterations(loop*)
        ???:0
0x15bc037 estimated_loop_iterations(loop*,
generic_wide_int<widest_int_storage<131072> >*)
        ???:0
0x15bc067 estimated_loop_iterations_int(loop*)
        ???:0
0x15cf559 tree_ssa_unswitch_loops(function*)
        ???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$=