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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/106032] [10/11/12/13 Regression] wrong code at
 -Os and above on x86_64-linux-gnu
Date: Mon, 20 Jun 2022 15:09:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106032

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This one seems to be very old:

__attribute__((noipa, noinline, noclone)) int
foo (int x, int *y)
{
  int a =3D 0;
  if (x < 0)
    a =3D *y;
  return a;=20=20
}

int
main ()
{
  int a =3D 42;
  if (foo (0, 0) !=3D 0 || foo (1, 0) !=3D 0)
    __builtin_abort ();
  if (foo (-1, &a) !=3D 42 || foo (-42, &a) !=3D 42)
    __builtin_abort ();
  return 0;
}

I guess checking may_trap_p or may_trap_or_fault_p in noce_try_sign_mask wo=
uld
fix this, but we probably should check other noce_* functions how they hand=
le
possibly faulting memory.=