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 E1E6C3858D37; Thu, 29 Jun 2023 12:41:20 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org E1E6C3858D37
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1688042480;
	bh=eyaZrcjfbhMswnD6I7dKzpj+nYsFca7m9wxAKxQ58Do=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=OnjOaZyRVKL7acs2OTFSWHSYR3bMck4CT+uLukBCCvkuXV/Gn8Bw679/3Xv/j5SD2
	 NyTwlj8XDdGhxyW4jlgNnV258LKvlr4e+TyoPj/kwHqWERRTqNvgHmA5TuphIfSHeZ
	 T/ZTG9R5e5NsMl60s9UqW4QUFSzGtw5ZUd8sk0Qs=
From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/110479] Unnecessary register move
Date: Thu, 29 Jun 2023 12:41:20 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: ubizjak at gmail dot com
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-110479-4-kOdivv7wHO@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-110479-4@http.gcc.gnu.org/bugzilla/>
References: <bug-110479-4@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=3D110479

--- Comment #1 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
(In reply to Thomas Koenig from comment #0)

>         movl    %edi, %ecx

This one? It is needed because SAL wants its count argument in %cl and first
argument is passed in %edi (mandated by x86_64 ABI).

With -mbmi2, one gets:

        shrl    $10, %edi
        movl    $1, %eax
        andl    $3, %edi
        addl    $3, %edi
        shlx    %edi, %eax, %eax
        ret=