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 764793858CDA; Fri,  7 Oct 2022 09:44:53 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 764793858CDA
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1665135893;
	bh=fr5r+liqid3UXoyBvXN71ivKrk/rHCzczqN+A/c+OvQ=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=wal3d3dG2uB5eAbDY8cVTEwHDooikqGVSucfzQHgNKkPXZa3p6GkuSLE23ewg6C3l
	 yFZwrn8LYk2YK7DwZIHx8WdWKqhS8G9HnQ60IZCQYzKxO7Gj6xe3T71TCfBcc9GgUp
	 qsej6D769yfuzO/8negJvyffrZQEpUYCLI1QBPkY=
From: "zhongyunde at huawei dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107090] [aarch64] sequence logic should be
 combined with mul and umulh
Date: Fri, 07 Oct 2022 09:44:52 +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: 13.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: zhongyunde at huawei dot com
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: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-107090-4-0z3sLtClU6@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-107090-4@http.gcc.gnu.org/bugzilla/>
References: <bug-107090-4@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=3D107090

--- Comment #4 from vfdff <zhongyunde at huawei dot com> ---
(In reply to Andrew Pinski from comment #1)
> A few issues.
> First is:
>=20
>   if (_26 !=3D 0)
>     goto <bb 3>; [50.00%]
>   else
>     goto <bb 4>; [50.00%]
>=20
>   <bb 3> [local count: 536870913]:
>   ht_15 =3D ht_13 + 4294967296;
>=20
>   <bb 4> [local count: 1073741824]:
>   # ht_2 =3D PHI <ht_13(2), ht_15(3)>
>=20

For the 1st issue, I see the gcc works well before gcc8 with if-conversion,
https://godbolt.org/z/99a9e59Ge=