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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/101885] [10/11/12 Regression] wrong code at
 -O3 on x86_64-linux-gnu
Date: Thu, 20 Jan 2022 15:40:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101885

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
And even
int a =3D 3, c;
short b =3D 5, d, f;
volatile short e;

__attribute__((noipa)) void
foo (void)
{
}

int
main ()
{
  for (f =3D 0; f !=3D 2; f++)
    {
      int g =3D a;
      if (b)
        if (a)
          for (a =3D b =3D 0; b <=3D 3; b++)
            ;
      for (c =3D 0; c !=3D 16; ++c)
        e;
    }
  b =3D d;
  foo ();
  if (a !=3D 0)
    __builtin_abort ();
  return 0;
}

so one doesn't need to unroll that many times etc.=