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From: "zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107172] New: wrong code with "-O1 -ftree-vrp"
 on x86_64-linux-gnu
Date: Thu, 06 Oct 2022 17:51:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107172

            Bug ID: 107172
           Summary: wrong code with "-O1 -ftree-vrp" on x86_64-linux-gnu
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhendong.su at inf dot ethz.ch
  Target Milestone: ---

This seems to be a recent regression.

Compiler Explorer: https://godbolt.org/z/xj7ods8Pv

[596] % gcctk -v
Using built-in specs.
COLLECT_GCC=3Dgcctk
COLLECT_LTO_WRAPPER=3D/local/suz-local/software/local/gcc-trunk/libexec/gcc=
/x86_64-pc-linux-gnu/13.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=3Dyes --prefix=3D/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=3Dc,c++ --disable-werror --enable-mu=
ltilib
--with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20221006 (experimental) [master r13-3101-g966010b2eb4] (=
GCC)=20
[597] %=20
[597] % gcctk -O1 small.c; ./a.out
[598] %=20
[598] % gcctk -O1 -ftree-vrp small.c
[599] % ./a.out
Segmentation fault
[600] %=20
[600] % cat small.c
int a, *b, c, d;
int main() {
  long e =3D 1;
  int f =3D a =3D 1;
 L1:
  if (a)
    a =3D 2;
  int h =3D e =3D ~e;
  c =3D -1;
  if (e >=3D a)
    goto L2;
  if (c > a)
    goto L1;
  if (a)
    f =3D -1;
 L2:
  d =3D (-f + d) & h;
  if (d)
    (*b)++;
  return 0;
}=