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 5B6103948495; Fri, 20 Mar 2020 17:47:09 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 5B6103948495
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1584726429;
 bh=50jpvcU5mTyh9tge3eA1o5Yl+KAhwwoYNvVirwuBUdU=;
 h=From:To:Subject:Date:In-Reply-To:References:From;
 b=W/1V5NT+erkP8MvXe4hQZTddxqa/AmCVRBJsIv4RIuET5K5M80d0imOJkkPbkxKtJ
 +kNWsGlmPCr0nilTC03Cp3pVlWIeB3uSaxudjZSbJXpmC27h+j+zFX2KIgeHKfbplX
 GvXSx1sE01IVUUHUkYXsPqlnvnmro4P4il3PGdGo=
From: "ch3root at openwall dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/94103] Wrong optimization: reading value of a variable
 changes its representation for optimizer
Date: Fri, 20 Mar 2020 17:47:09 +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: 10.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ch3root at openwall dot com
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-94103-4-02BvXLGAqE@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-94103-4@http.gcc.gnu.org/bugzilla/>
References: <bug-94103-4@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: <http://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: Fri, 20 Mar 2020 17:47:09 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94103

--- Comment #15 from Alexander Cherepanov <ch3root at openwall dot com> ---
(In reply to rguenther@suse.de from comment #14)
> From a language Pov that's the same.
> But memcpy and friends work on any dynamic type so have to copy all bytes.
Sorry, I don't understand. Bug 61872, comment 1, and bug 92486, comment 9, =
look
the same -- a memset followed by an assignment.  But the former is with long
double while the latter is with a struct.

You mean that assignments of structs are equivalent to memcpy while assignm=
ents
of long doubles aren't? Why the difference?=