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 160BF39858B3; Mon, 22 Jun 2020 07:39:02 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 160BF39858B3
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1592811542;
 bh=Yhkeu4fATQicvR3qC6cGf43B4H+rdDhSm8GeWUET1BU=;
 h=From:To:Subject:Date:In-Reply-To:References:From;
 b=Fm5XA21j/41zBaWrq+pIaRjkFd5k7daWoEaGa6QQ8S1iAzUjrgXnOj1gjh1UmXyer
 qtXUUF7MZNE3SjH/HKcvs9N8UWOwr7qg7vM4symAqISxWR0bAGSyD9stnnaVim9lrc
 gpW7P+yFtkBuoEqIePZ38VGnd4KHWHldPAuYnTZg=
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/95775] Command line argument for target_clones?
Date: Mon, 22 Jun 2020 07:39:02 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: ipa
X-Bugzilla-Version: 10.1.1
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: rguenth 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: cc component bug_severity
Message-ID: <bug-95775-4-3ZS33WeJm2@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-95775-4@http.gcc.gnu.org/bugzilla/>
References: <bug-95775-4@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
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <http://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <http://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Mon, 22 Jun 2020 07:39:02 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95775

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marxin at gcc dot gnu.org
          Component|target                      |ipa
           Severity|normal                      |enhancement

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
But it will blow up code-size considerably.  Eventually with -flto and the
library constraining on what symbols it exports one could figure the
minimal set of functions with IFUNC relocations at least.  Using
profile-feedback
might also able to concentrate on interesting functions.

So without some major work I don't think simply slapping target_clones on
each function is going to fly in practice.

Eventually it should be possible to do sth like target_clones(auto) where
with a new option, the target (or the user) can define "default" targets
to clone for but the user still figures which are the important functions
to optimize [and GCC may, via IPA "spread" the cloned cgraph portion a bit]=
.=