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 878EF3858C39; Mon, 18 Oct 2021 07:25:58 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 878EF3858C39
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/102767] [12 Regression] ICE in
 rs6000_builtin_vectorization_cost, at config/rs6000/rs6000.c:5216
Date: Mon, 18 Oct 2021 07:25:58 +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: 12.0
X-Bugzilla-Keywords: ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth 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: 12.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: assigned_to bug_status
Message-ID: <bug-102767-4-HjYOWISrMC@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-102767-4@http.gcc.gnu.org/bugzilla/>
References: <bug-102767-4@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
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Mon, 18 Oct 2021 07:25:58 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102767

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|rguenth at gcc dot gnu.org         |unassigned at gcc d=
ot gnu.org
             Status|ASSIGNED                    |NEW

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
the backend says it can support misaligned V1TI via
rs6000_builtin_support_vector_misalignment:

rs6000_builtin_support_vector_misalignment (mode=3DE_V1TImode, type=3D<inte=
ger_type
0x7ffff66f41f8>,=20
    misalignment=3D8, is_packed=3Dfalse) at
../../src/trunk/gcc/config/rs6000/rs6000.c:5069
...
      /* VSX supports word-aligned vector.  */
      if (misalignment % 4 =3D=3D 0)
        return true;

so the vectorizer classifies it as dr_unaligned_supported and we of course
are then allowed to cost the supported unaligned store but the cost
hook doesn't consider elements =3D=3D 1.

Now, we probably should avoid 1-lane vector vectorization in BB vect but th=
at's
a different story.=