[Bug c/110491] New: Wrong code at -O2 on x86_64-linux-gnu (a recent regression)

["shaohua.li at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110491

            Bug ID: 110491
           Summary: Wrong code at -O2 on x86_64-linux-gnu (a recent
                    regression)
           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: ---

gcc at -O2 produced wrong code.

Compiler explorer: https://godbolt.org/z/cbM1q13G7

$ cat a.c
int printf(const char *, ...);
int a, c, d, e;
short b;
void f(int *g) { c &= *g; }
void h(void);
void i() {
  a = 1;
  h();
  f(&a);
}
void h() {
  int *j = &c;
  *j = 5;
k:
  for (; 4 + b <= 0;)
    ;
  for (; d;) {
    c = e == 0;
    goto k;
  }
}
int main() {
  i();
  printf("%d\n", c);
}
$
$ gcc-tk -O0 a.c &&./a.out
1
$ gcc-tk -O2 a.c && ./a.out
-2003318871
$
$ gcc-tk -v
Using built-in specs.
COLLECT_GCC=gcc-tk
COLLECT_LTO_WRAPPER=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-5f590ee3174cf6058ac882c3a84a96ae639349c8/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=c,c++
--prefix=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-5f590ee3174cf6058ac882c3a84a96ae639349c8
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230629 (experimental) (GCC)
$