From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 905A738493CF; Thu, 12 Jan 2023 19:43:30 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 905A738493CF
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1673552610;
	bh=6Ec6nH0x279L0YKu/MT0SZz8jKgMqLTejNgp2A5Ny3w=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=tHIVC+sgy2eKYqixtYZRZwHnbSAxwN3T1wFJIPfmiAo3IE6NJoRA/NmOppuzHPWX7
	 hUB4SoQNRlbWSIq6f2bi+w0hrIYI8fc0VpWjM0QeQ65/taBJ26mhMDVlHMSnKvmGA2
	 OrbkJtuirefC1pIebccm5Ur7w58VX1hpqB8cZUnE=
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: =?UTF-8?B?W0J1ZyBpcGEvMTA4Mzg0XSBbMTMgUmVncmVzc2lvbl0gZXJyb3I6?=
 =?UTF-8?B?IGNvbnZlcnNpb24gb2YgcmVnaXN0ZXIgdG8gYSBkaWZmZXJlbnQgc2l6ZSBp?=
 =?UTF-8?B?biDigJh2aWV3X2NvbnZlcnRfZXhwcuKAmQ==?=
Date: Thu, 12 Jan 2023 19:43:29 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: ipa
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: ice-checking, ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 13.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-108384-4-QSclA8ZX7m@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-108384-4@http.gcc.gnu.org/bugzilla/>
References: <bug-108384-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108384

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #10)
> If it is __builtin_clear_padding only, I'll have a look...

After the __builtin_clear_padding is exposed and before the IPA passes, the=
 IR
looks like:

  l_26[1].f0 =3D 4;
  MEM <long int> [(struct S0[2] *)&l_26 + 16B] =3D 25770065925;
  func_23 (l_26[1], func_2_l_27);

So here is another testcase which you can reproduce it with -O3
-fno-strict-aliasing (because I voilate aliasing rules to get a similar eno=
ugh
IR):
```
struct S0 {
  int f0;
  short f1;
  unsigned f2 : 7;
  short f3;
} func_2_l_27;
int *g_389;
int safe_sub_func_int16_t_s_s(void);
void safe_lshift_func_uint8_t_u_s(int);
void func_23(struct S0 p_24, struct S0 p_25) {
  int *l_1051 =3D g_389;
  if (safe_sub_func_int16_t_s_s())
    for (;;)
      safe_lshift_func_uint8_t_u_s(p_24.f1);
  *l_1051 =3D p_25.f0;
}
void func_2(void) {
  struct S0 l_26[2];
  l_26[1].f0 =3D 4;
  ((long long*)&l_26)[2] =3D 25770065925;
  func_23(l_26[1], func_2_l_27);
}
```=