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 F285E384646C; Wed, 10 Apr 2024 11:06:49 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org F285E384646C
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1712747209;
	bh=FHSPFOxR6C9DhHHebo+QmGpGnN2iD/g4HhStLZLlapo=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=kV1ZMbfuoK0tuf03VHjfWlVUE+Rdahr9fIgHyh8JhYGtbVWEv2r68poFZ8m5I8McA
	 V82Vy/qEUmdeu2OOUy2CIyG7gT4fMaA3nRqpIaeC+GavVt/S6GvrwCKSzIekJEM9Aw
	 CAdZdSwMps2h7uoKbEkcYQeVbpRVlh0uidywR6WY=
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114676] [12/13/14 Regression] DSE removes assignment
 that is used later
Date: Wed, 10 Apr 2024 11:06:49 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 12.1.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 12.4
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: keywords component target_milestone
Message-ID: <bug-114676-4-35P78wKTAM@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-114676-4@http.gcc.gnu.org/bugzilla/>
References: <bug-114676-4@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=3D114676

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
          Component|tree-optimization           |target
   Target Milestone|---                         |12.4

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
        /* Build a vector type with the alignment of the target
           location in order to enable correct alignment hints to be
           generated for vst.  */
        tree mem_type =3D build_aligned_type (TREE_TYPE((*arglist)[0]),
                                            TYPE_ALIGN (TREE_TYPE (TREE_TYPE
((*arglist)[2]))));
        return build2 (MODIFY_EXPR, mem_type,
                       build1 (INDIRECT_REF, mem_type,
                               fold_build_pointer_plus ((*arglist)[2],
(*arglist)[1])),
                       (*arglist)[0]);


Does -fno-strict-aliasing help? I wonder if the above (which is
S390_OVERLOADED_BUILTIN_s390_vec_xst from s390_expand_overloaded_builtin)
should be have an may_alias variant .=