[Bug c++/109362] codegen adds unnecessary extra add when reading atomic member

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109362

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Reduced C testcase would be
struct S { long a, b; };

int
foo (struct S *v)
{
  while (1)
    {
      __atomic_load_n (&v->a, __ATOMIC_ACQUIRE);
      if (__atomic_load_n (&v->b, __ATOMIC_ACQUIRE))
        return 1;
    }
}