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 3F2F7385742A; Tue, 17 May 2022 03:29:00 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3F2F7385742A
From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/105617] [12/13 Regression] Slp is maybe too aggressive
 in some/many cases
Date: Tue, 17 May 2022 03:29:00 +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: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: crazylht at gmail dot com
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: 12.2
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-105617-4-CacV1svg4a@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-105617-4@http.gcc.gnu.org/bugzilla/>
References: <bug-105617-4@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: Tue, 17 May 2022 03:29:00 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105617

--- Comment #8 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Hongtao.liu from comment #7)
> Hmm, we have specific code to add scalar->vector(vmovq) cost to vector
> construct, but it seems not to work here, guess it's because &r0,and thou=
ght
> it was load not scalar=EF=BC=9F=20
Yes, true for as gimple_assign_load_p


(gdb) p debug_gimple_stmt (def)
72# VUSE <.MEM_46>
73r0.0_20 =3D r0;
(gdb) l
21723246                move it to a vector register, otherwise we have to =
go
21823247                via a GPR or via vpinsr which involves similar cost.
21923248                Likewise with a BIT_FIELD_REF extracting from a vec=
tor
22023249                register we can hope to avoid using a GPR.  */
22123250             if (!is_gimple_assign (def)
22223251                 || (!gimple_assign_load_p (def)
22323252                     && (gimple_assign_rhs_code (def) !=3D BIT_FIEL=
D_REF
22423253                         || !VECTOR_TYPE_P (TREE_TYPE
22523254                                   (TREE_OPERAND (gimple_assign_rhs1
(def), 0))))))
22623255               stmt_cost +=3D ix86_cost->sse_to_integer;=