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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107302] New: [13 Regression] ICE in as_a, at
 is-a.h:242 since r13-3327-g46a8e017d048ec32
Date: Tue, 18 Oct 2022 07:53:27 +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: 13.0
X-Bugzilla-Keywords: ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: marxin at gcc dot gnu.org
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=3D107302

            Bug ID: 107302
           Summary: [13 Regression] ICE in as_a, at is-a.h:242 since
                    r13-3327-g46a8e017d048ec32
           Product: gcc
           Version: 13.0
            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: ---

The following crashes:

$ cat tsvc.i
int a[0];
int s292_im1;

void
s292() {
  for (int i =3D 0; i < 2000; i++) {
    a[i] =3D s292_im1;
    s292_im1 =3D i;
  }
}

$ gcc tsvc.i -fno-tree-pre -O2
during GIMPLE pass: vect
tsvc.i: In function =E2=80=98s292=E2=80=99:
tsvc.i:5:1: internal compiler error: in as_a, at is-a.h:242
    5 | s292() {
      | ^~~~
0x7fa8a6 gimple_statement_with_memory_ops*
as_a<gimple_statement_with_memory_ops*, gimple>(gimple*)
        /home/marxin/Programming/gcc/gcc/is-a.h:242
0x7fde52 gphi* as_a<gphi*, gimple>(gimple*)
        /home/marxin/Programming/gcc/gcc/gimple-iterator.h:129
0x7fde52 gphi_iterator::phi() const
        /home/marxin/Programming/gcc/gcc/gimple-iterator.h:43
0x7fde52 vect_transform_loop(_loop_vec_info*, gimple*)
        /home/marxin/Programming/gcc/gcc/tree-vect-loop.cc:10894
0x124f32e vect_transform_loops
        /home/marxin/Programming/gcc/gcc/tree-vectorizer.cc:1007
0x124f90f try_vectorize_loop_1
        /home/marxin/Programming/gcc/gcc/tree-vectorizer.cc:1153
0x124f90f try_vectorize_loop
        /home/marxin/Programming/gcc/gcc/tree-vectorizer.cc:1183
0x124fca4 execute
        /home/marxin/Programming/gcc/gcc/tree-vectorizer.cc:1299
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.=