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 E4F1E3858D32; Fri, 17 Nov 2023 05:43:30 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org E4F1E3858D32
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1700199810;
	bh=qP/+ViKZ7iNVs9vvkJVcA8Vt787aBd5smduNOHIDI2I=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=lq4ONWq9SGwhI05bhSZyu+XBFky4VTEqTXySrTxb8mLahskA/r9/e3qV+CRB2tmvw
	 FkhiMNhmFHZRzwv2TvHE9FX5mYVzBKSppVk7ye4T+X9H+wELhXkJxSQZj+3RmU69aU
	 0k+2jk0pX0e+HlHtnqm/BYPHN23hX6giANk2PXsg=
From: "liuhongt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/112579] bb vectorizer failed to reduction sum
 += inv >> {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}
Date: Fri, 17 Nov 2023 05:43:30 +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: 14.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: liuhongt 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: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-112579-4-Dt35gmvf7V@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-112579-4@http.gcc.gnu.org/bugzilla/>
References: <bug-112579-4@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=3D112579

--- Comment #2 from liuhongt at gcc dot gnu.org ---
Got vectorized after change source code to

unsigned
foo (unsigned * restrict s, unsigned qh, unsigned * restrict qs) {
  unsigned int sumi =3D 0;

  sumi +=3D (qh >> 16);
  sumi +=3D (qh >> 1);
  sumi +=3D (qh >> 2);
  sumi +=3D (qh >> 3);
  sumi +=3D (qh >> 4);
  sumi +=3D (qh >> 5);
  sumi +=3D (qh >> 6);
  sumi +=3D (qh >> 7);
  sumi +=3D (qh >> 8);
  sumi +=3D (qh >> 9);
  sumi +=3D (qh >> 10);
  sumi +=3D (qh >> 11);
  sumi +=3D (qh >> 12);
  sumi +=3D (qh >> 13);
  sumi +=3D (qh >> 14);
  sumi +=3D (qh >> 15);
  return sumi;
}=