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 070513857C5E; Fri, 20 Aug 2021 10:46:02 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 070513857C5E
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/96481] SLP fail to vectorize VEC_COND_EXPR
 pattern.
Date: Fri, 20 Aug 2021 10:46:02 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-96481-4-vuyhCG38vm@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-96481-4@http.gcc.gnu.org/bugzilla/>
References: <bug-96481-4@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: Fri, 20 Aug 2021 10:46:03 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96481

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
double a[2];
typedef double v2df __attribute__((vector_size(16)));
void foo (v2df x, v2df y, v2df z, v2df w)
{
  double a0, a1;
  a0 =3D x[0] < y[0] ? z[0] : w[0];
  a1 =3D x[1] < y[1] ? z[1] : w[1];
  a[0] =3D a0;
  a[1] =3D a1;
}

is maybe a testcase that only has the PHI / gimple_cond parts preventing fu=
ll
vectorization.

I've pushed a patch that should allow experimenting with relaxing the BB sp=
lit
of the dataref groups but I'm wondering about a good testcase to motivate
fixing that on its own.=