From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <amonakov@ispras.ru>
Received: from mail.ispras.ru (mail.ispras.ru [83.149.199.84])
 by sourceware.org (Postfix) with ESMTPS id 4891438708AB
 for <gcc-help@gcc.gnu.org>; Thu, 14 Jan 2021 15:33:06 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 4891438708AB
Received: from monopod.intra.ispras.ru (unknown [10.10.3.121])
 by mail.ispras.ru (Postfix) with ESMTPS id 6EBF340A92A3;
 Thu, 14 Jan 2021 15:33:02 +0000 (UTC)
Date: Thu, 14 Jan 2021 18:33:02 +0300 (MSK)
From: Alexander Monakov <amonakov@ispras.ru>
To: stefan@franke.ms
cc: gcc-help@gcc.gnu.org
Subject: Re: AW: m68k: Simple loop compiles into boundless recursion with -O2
In-Reply-To: <037901d6ea88$1f7aed50$5e70c7f0$@bebbosoft.de>
Message-ID: <alpine.LNX.2.20.13.2101141831140.23548@monopod.intra.ispras.ru>
References: <X/8ZYSIWjJ1ikGuA@sx9>
 <alpine.LNX.2.20.13.2101131904010.23548@monopod.intra.ispras.ru>
 <X/8gK9JtEvr4jQtt@sx9> <20210113192015.GT30983@gate.crashing.org>
 <X/9PqXjpM4SttWJZ@sx9> <20210113214605.GU30983@gate.crashing.org>
 <YABbMV4KyySziVjx@sx9>
 <alpine.LNX.2.20.13.2101141803060.23548@monopod.intra.ispras.ru>
 <alpine.LNX.2.20.13.2101141806200.23548@monopod.intra.ispras.ru>
 <037901d6ea88$1f7aed50$5e70c7f0$@bebbosoft.de>
User-Agent: Alpine 2.20.13 (LNX 116 2015-12-14)
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
X-Spam-Status: No, score=-3.4 required=5.0 tests=BAYES_00, KAM_DMARC_STATUS,
 KAM_NUMSUBJECT, SPF_HELO_NONE, SPF_PASS,
 TXREP autolearn=no autolearn_force=no version=3.4.2
X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on
 server2.sourceware.org
X-BeenThere: gcc-help@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-help mailing list <gcc-help.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-help>,
 <mailto:gcc-help-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-help/>
List-Post: <mailto:gcc-help@gcc.gnu.org>
List-Help: <mailto:gcc-help-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-help>,
 <mailto:gcc-help-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Thu, 14 Jan 2021 15:33:07 -0000

On Thu, 14 Jan 2021, Stefan Franke wrote:

> Sorry, but I can't reproduce that 'dropping' of other options. I played
> around here: https://franke.ms/cex/z/EnK1GY
> Could you please provide a reproduceable example?

It is easily reproducible on x86: https://godbolt.org/z/Mx1KMe

Kernel people hit this issue recently when attemping to use the attribute:
https://lore.kernel.org/lkml/alpine.LSU.2.21.2004151445520.11688@wotan.suse.de/

Alexander