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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 c/110641] New: ICE in adjust_loop_info_after_peeling, at
 tree-ssa-loop-ivcanon.cc:1023
Date: Wed, 12 Jul 2023 13:08:02 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110641

            Bug ID: 110641
           Summary: ICE in adjust_loop_info_after_peeling, at
                    tree-ssa-loop-ivcanon.cc:1023
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: shaohua.li at inf dot ethz.ch
  Target Milestone: ---

This looks like a recent regression.

Compiler explorer: https://godbolt.org/z/55EzjdoTK

$ cat a.c
int a, b, c, d, e, g;
int *f;
short **h;
int i() {}
int j() { return a && a <=3D 'F' || a >=3D 'a' && a <=3D 'f'; }
int k() {
  d =3D 0;
  for (; d < 2; d =3D i())
    e =3D b =3D 0;
  for (; e - 71 + b; b++)
    ;
  for (;; c--) {
    g =3D 0;
    for (; j() + c + g >=3D 0; g--)
      **h =3D (char)b + b || f;
  }
}
int main() {}
$
$ gcc-tk -O3 a.c
during GIMPLE pass: ch_vect
crash_0_reduced.c: In function =E2=80=98k=E2=80=99:
crash_0_reduced.c:6:5: internal compiler error: in
adjust_loop_info_after_peeling, at tree-ssa-loop-ivcanon.cc:1023
    6 | int k() {
      |     ^
0x7f7b0bec4082 __libc_start_main
        ../csu/libc-start.c:308
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.
$
$ gcc-tk -v
Using built-in specs.
COLLECT_GCC=3Dgcc-tk
COLLECT_LTO_WRAPPER=3D/zdata/shaoli/compilers/ccbuilder-compilers/gcc-322d1=
7ae51ea0137167424e0018d7fa355948f9f/libexec/gcc/x86_64-pc-linux-gnu/14.0.0/=
lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --disable-multilib --disable-bootstrap
--enable-languages=3Dc,c++
--prefix=3D/zdata/shaoli/compilers/ccbuilder-compilers/gcc-322d17ae51ea0137=
167424e0018d7fa355948f9f
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230711 (experimental) (GCC)
$=