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 ACB663858D33; Mon,  4 Mar 2024 16:42:37 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org ACB663858D33
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1709570557;
	bh=Cqznl89aWINAbxwhw/8J9necRk4wVlqCfLEcX8iRPgk=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=PcslB/K+FdKuR7DrIcpNUYfkrQsjA9GVpUC1zq9yInQJZ9N+F2VTymy76CQAlXVIh
	 GEYSfqswB7yHka+qmtZ03vZWMGIEx0e+gEEcwXY0GGUTWx3vLw5FF4z0DcX9KUhR1c
	 P4H0MqNvYUbOlI1uaq07BuvVjXArmw/MaEHHZhmY=
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/94787] Failure to detect single bit popcount pattern
Date: Mon, 04 Mar 2024 16:42:37 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 10.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: pinskia at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-94787-4-SODB4EIOmQ@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-94787-4@http.gcc.gnu.org/bugzilla/>
References: <bug-94787-4@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=3D94787

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
And add:
```
int h(int a)
{
        if (a =3D=3D 0) return 0;
        return __builtin_popcount(a) =3D=3D 1;
}

int h1(int a)
{
        if (a =3D=3D 0) return 1;
        return __builtin_popcount(a) =3D=3D 1;
}
```

h should be just `__builtin_popcount(a) =3D=3D 1`.
While h1 should be just `__builtin_popcount(a) <=3D 1`.=