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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/107195] New: wrong code with "-O1
 -fno-tree-ccp" on x86_64-linux-gnu
Date: Sun, 09 Oct 2022 13:01:53 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107195

            Bug ID: 107195
           Summary: wrong code with "-O1 -fno-tree-ccp" 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 doesn't fail with 12.2, so looks like a recent regression. Perhaps rel=
ated
to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107172 or
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107194?=20

Compiler Explorer: https://godbolt.org/z/94E6r84ra

[524] % 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 20221009 (experimental) [master r13-3180-ge95e91eccd0] (=
GCC)=20
[525] %=20
[525] % gcctk -O1 small.c; ./a.out
[526] %=20
[526] % gcctk -O1 -fno-tree-ccp small.c
[527] % ./a.out
Aborted
[528] %=20
[528] % cat small.c
int a, b;
int main() {
  int c =3D 0;
  if (a)
    c =3D 1;
  c =3D 1 & (a && c) && b;
  if (a) {
    b =3D c;
    __builtin_abort ();
  }
  return 0;
}=