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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/107269] wrong code at -O1 and above with
 "-fno-tree-ccp" on x86_64-linux-gnu
Date: Fri, 14 Oct 2022 18:29:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107269

--- Comment #1 from Zhendong Su <zhendong.su at inf dot ethz.ch> ---
A related instance:

[537] % 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 20221014 (experimental) [master r13-3307-g8efc38347a7] (=
GCC)=20
[538] %=20
[538] % gcctk -O1 small.c; ./a.out
[539] %=20
[539] % gcctk -O1 -fno-tree-ccp small.c
[540] % timeout -s 9 5 ./a.out
Killed
[541] %=20
[541] % cat small.c
int a, c, d;
unsigned b;
int main() {
  int f =3D 1;
 L1:
  c =3D f;
 L2:
  b & f;
  short i =3D -f;
  if (!a) {
    d =3D f;
    f =3D ~(b % f);
    if (d > -1)
      goto L2;
  }
  f =3D i;
  if (a)
    goto L1;
  int *j =3D &f;
  return 0;
}=