[Bug rtl-optimization/97836] New: wrong code at -O1 on x86_64-pc-linux-gnu

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97836

            Bug ID: 97836
           Summary: wrong code at -O1 on x86_64-pc-linux-gnu
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhendong.su at inf dot ethz.ch
  Target Milestone: ---

[510] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/11.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--prefix=/local/suz-local/software/local/gcc-trunk --enable-languages=c,c++
--disable-werror --enable-multilib --with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.0.0 20201115 (experimental) [master revision
406b452dc0e:d88ff5a679d:faab61b585a8b4a42454f085dd6b7815992a98f5] (GCC) 
[511] % 
[511] % gcctk -O0 small.c; ./a.out
[512] % 
[512] % gcctk -O1 small.c; ./a.out
Aborted
[513] % 
[513] % cat small.c
int *a, b;

int *f(int *c) {
  b = 0;
  return c;
}

int main() {
  int d;
  a = f(&d);
  if (a != &d)
    __builtin_abort ();
  return 0;
}