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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/92860] [9/10/11/12 regression] Global flags
 affected by -O settings are clobbered by optimize attribute
Date: Tue, 04 Jan 2022 17:43:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D92860

--- Comment #87 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
Self-contained test-case:

$ cat options-save2.ii
char flags[16];

int one =3D 1, two =3D 2;

void
__attribute__ ((noipa))
save() {
  flags[0] =3D one;
  flags[1] =3D one;
  flags[2] =3D one;
  flags[3] =3D one;
  flags[4] =3D one;
  flags[5] =3D one;
  flags[6] =3D one;
  flags[7] =3D one;
  flags[8] =3D one;
  flags[9] =3D one;
  flags[10] =3D one;
  flags[11] =3D one;
  flags[12] =3D one;
  flags[13] =3D one;
  flags[14] =3D one;
  flags[15] =3D two;
}

int
main()
{
  save ();

  __builtin_printf ("flags[0]=3D%d, flags[15]=3D%d\n", flags[0], flags[15]);
  if (flags[15] !=3D 2)
    __builtin_abort ();

  return 0;
}=