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 6B48F3861843; Tue,  9 Feb 2021 22:12:42 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 6B48F3861843
From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/98692] Unitialized Values reported only with -Os
Date: Tue, 09 Feb 2021 22:12:42 +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: 10.2.1
X-Bugzilla-Keywords: diagnostic
X-Bugzilla-Severity: normal
X-Bugzilla-Who: segher at gcc dot gnu.org
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-98692-4-adAkfYO02Z@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-98692-4@http.gcc.gnu.org/bugzilla/>
References: <bug-98692-4@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: <https://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: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Tue, 09 Feb 2021 22:12:42 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98692

--- Comment #15 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Will Schmidt from comment #14)
> The _restgpr* and _savegpr* functions are not referenced when the test is
> built at other optimization levels.  (I've looked at disassembly from -O0=
 ..
> -O4).

Right, it is a size optimisation.

> I do note that the _restgpr and _savegpr functions are called differently=
.=20
> savegpr is called with bl while the restgpr is called via a direct branch=
; i
> can't immediately tell if this is by design or if it is in error.

It is by design: these are special functions defined by the ABI, specifical=
ly
to save some code space.=