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 6D88C382164D; Tue,  4 Jun 2024 07:00:32 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 6D88C382164D
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1717484432;
	bh=1u2fhfx4jqi/thI4IvSiMRRaN7F+a41AgqBM4ykTwbA=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=PsjYrXnVQVGkG7WsDfR5yxCmoB/k8QkNWucUvzIZwvFua0p44TuJjq3UYPq3ws1q6
	 GJa6JvO6oWujgoqaJmpyqeyvksKQPMHX1jeWTeb452uiXnyFWBhjLzhGRli23AE+TD
	 xQHeBRzhK/3NFs0MCwjW15XNz/aOgkedFJJ4hQtU=
From: "syq at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/111376] missed optimization of one bit test on MIPS32r1
Date: Tue, 04 Jun 2024 07:00:32 +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: unknown
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: syq at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: syq at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-111376-4-Id9J8nYKCS@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-111376-4@http.gcc.gnu.org/bugzilla/>
References: <bug-111376-4@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=3D111376

--- Comment #2 from YunQiang Su <syq at gcc dot gnu.org> ---
(In reply to YunQiang Su from comment #1)
> RISC-V has this problem, too.
> Maybe we can try to combine it in `combine` pass, while it may be not eas=
y.
> It may break some code like:
>=20
> ```
> int f1();
> int f2();
>=20
> int f(int a) {
>         int p =3D (a & 0x80000);
>         if (p)
>                 return p;
>         else
>                 return f2();
> }
> ```
>=20
> And in fact your patch also break it.

Ohh, this comment is not correct....=