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 F23FF3858D39; Mon, 23 Oct 2023 10:38:44 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org F23FF3858D39
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1698057524;
	bh=lbOGtJZvK+vNLq5m+87FmN/cLahQlbXr+Egi2DQTSMw=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=i+9F5IpP4CY6UZWfD7JWggCr4FHMSfcZx8n45qCDlxbZ/H6P9Ksium00eIQCa0M+V
	 0bSeS53mrth8Rj808PSve+DL7K00SvCHonAh7/70oZDpXhxOvY9XD4eTBqk0qzEGb0
	 6hiL7VTxn7P+lRyEFkHIzKTjb97GnoMA1IzSa52o=
From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/111873] [12/13/14 Regression] runtime Segmentation fault
 with '-O3 -fno-code-hoisting -fno-early-inlining -fno-tree-fre -fno-tree-pre'
Date: Mon, 23 Oct 2023 10:38:44 +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: 14.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ebotcazou at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: ebotcazou at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 12.4
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-111873-4-nzcrGJ1RQc@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-111873-4@http.gcc.gnu.org/bugzilla/>
References: <bug-111873-4@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=3D111873

--- Comment #8 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
The bug is in the (early) SRA pass though;

void h (const struct a i)
{
  const short int i$b;
  int _1;
  short int _2;
  int _3;
  short int _4;
  int _5;

  <bb 2> :
  i$b_10 =3D i.b;
  i.b =3D i$b_10;
  _1 =3D g (i);
  d =3D _1;
  _2 =3D i$b_10;
  _3 =3D (int) _2;
  f (_3);
  _4 =3D i$b_10;
  _5 =3D (int) _4;
  e (_5);
  return;

}

which creates a store to the read-only parameter i:

(gdb) p debug_gimple_stmt(stmt)
# .MEM =3D VDEF <.MEM>
i.b =3D i$b;
$2 =3D void
(gdb) p debug_tree(gimple_get_lhs (stmt))
 <component_ref 0x7ffff71dee10
    type <integer_type 0x7ffff71b6930 short int readonly sizes-gimplified HI
        size <integer_cst 0x7ffff702c0f0 constant 16>
        unit-size <integer_cst 0x7ffff702c108 constant 2>
        align:16 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7ffff71b6930 precision:16 min <integer_cst 0x7ffff702c090 -32768> max
<integer_cst 0x7ffff702c0c0 32767>>
    readonly
    arg:0 <parm_decl 0x7ffff7fc8300 i
        type <record_type 0x7ffff71b6540 a readonly sizes-gimplified type_0=
 HI
size <integer_cst 0x7ffff702c0f0 16> unit-size <integer_cst 0x7ffff702c108 =
2>
            align:16 warn_if_not_align:0 symtab:0 alias-set -1 canonical-ty=
pe
0x7ffff71b6540 fields <field_decl 0x7ffff7039688 b>>
        readonly used read HI pr111873.c:18:24 size <integer_cst 0x7ffff702=
c0f0
16> unit-size <integer_cst 0x7ffff702c108 2>
        align:16 warn_if_not_align:0 context <function_decl 0x7ffff71e2300 =
h>
arg-type <record_type 0x7ffff71b6540 a>>
    arg:1 <field_decl 0x7ffff7039688 b
        type <integer_type 0x7ffff702a498 short int sizes-gimplified HI size
<integer_cst 0x7ffff702c0f0 16> unit-size <integer_cst 0x7ffff702c108 2>
            align:16 warn_if_not_align:0 symtab:0 alias-set -1 canonical-ty=
pe
0x7ffff702a498 precision:16 min <integer_cst 0x7ffff702c090 -32768> max
<integer_cst 0x7ffff702c0c0 32767>>
        HI pr111873.c:5:9 size <integer_cst 0x7ffff702c0f0 16> unit-size
<integer_cst 0x7ffff702c108 2>
        align:16 warn_if_not_align:0 offset_align 128 decl_not_flexarray: 1
        offset <integer_cst 0x7ffff700bf60 constant 0>
        bit-offset <integer_cst 0x7ffff700bfa8 constant 0> context <record_=
type
0x7ffff71b6f18 a>>
    pr111873.c:21:7 start: pr111873.c:21:6 finish: pr111873.c:21:8>

/* In a VAR_DECL, PARM_DECL or FIELD_DECL, or any kind of ..._REF node,
   nonzero means it may not be the lhs of an assignment.
   Nonzero in a FUNCTION_DECL means this function should be treated
   as "const" function (can only read its arguments).  */
#define TREE_READONLY(NODE) (NON_TYPE_CHECK (NODE)->base.readonly_flag)=