From owner-freebsd-ppc@freebsd.org  Thu Sep  8 13:01:44 2016
Return-Path: <owner-freebsd-ppc@freebsd.org>
Delivered-To: freebsd-ppc@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 97753BD17E2
 for <freebsd-ppc@mailman.ysv.freebsd.org>;
 Thu,  8 Sep 2016 13:01:44 +0000 (UTC)
 (envelope-from kristof@swissmail.org)
Received: from smtp.swissmail.org (smtpout.swissmail.org [212.25.22.149])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 5539CD80
 for <freebsd-ppc@freebsd.org>; Thu,  8 Sep 2016 13:01:43 +0000 (UTC)
 (envelope-from kristof@swissmail.org)
Received: from vm-mailout1.vm.swissmail.org (vm-mailout1.vm.swissmail.org
 [212.25.22.134])
 by smtp.swissmail.org (Postfix) with ESMTPS id 46CDC80FE3
 for <freebsd-ppc@freebsd.org>; Thu,  8 Sep 2016 14:56:31 +0200 (CEST)
Received: from vm-pemfos2.intra.swissmail.org (unknown [192.168.173.55])
 by vm-mailout1.vm.swissmail.org (Postfix) with ESMTP id 47F649FCD7
 for <freebsd-ppc@freebsd.org>; Thu,  8 Sep 2016 15:01:40 +0200 (CEST)
Received: from vm-pemfos2.intra.swissmail.org (localhost [127.0.0.1])
 by localhost (PEmFoS-local-10025) with ESMTP id 3B7CB4A00D
 for <freebsd-ppc@freebsd.org>; Thu,  8 Sep 2016 15:01:40 +0200 (CEST)
Received: from localhost (localhost [127.0.0.1])
 by localhost (PEmFoS/1560.7492.a1);
 Thu,  8 Sep 2016 15:01:40 +0200 (CEST)
X-Pemfos-Policyd: accepted
 (ZdUbEYOav9fEaJN53xOrnhsaFn8fMjUlWRE9IkIlH2FzF+MSHFVlFBgbRlcMVws1)
Subject: Re: From llvm: Fwd: [Bug 26519] Clang 3.8.0's "Target:
 powerpc-unknown-freebsd11.0" code generation is violating the SVR4 ABI (SEGV
 can result) [fixed in llvm -r280705]
To: freebsd-ppc@freebsd.org
References: <BF0692B3-495A-42A5-B37E-55E1CD7F16AD@dsl-only.net>
From: Krzysztof Parzyszek <kristof@swissmail.org>
Message-ID: <0f2f330a-8eeb-722d-5dcf-12d70543436e@swissmail.org>
Date: Thu, 8 Sep 2016 08:01:31 -0500
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101
 Thunderbird/45.2.0
MIME-Version: 1.0
In-Reply-To: <BF0692B3-495A-42A5-B37E-55E1CD7F16AD@dsl-only.net>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit
X-Virus-Scanned: clamav-milter 0.99.2 at vm-mailout1
X-Virus-Status: Clean
X-BeenThere: freebsd-ppc@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: Porting FreeBSD to the PowerPC <freebsd-ppc.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-ppc>,
 <mailto:freebsd-ppc-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-ppc/>
List-Post: <mailto:freebsd-ppc@freebsd.org>
List-Help: <mailto:freebsd-ppc-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-ppc>,
 <mailto:freebsd-ppc-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 08 Sep 2016 13:01:44 -0000

On 9/7/2016 9:42 PM, Mark Millard wrote:
>
> I think that "optimizations" here means (in part?) avoiding the floating point hardware as the kernel need not save/restore the registers and the like for its own activities. Only user-space gets that service as I understand.
>


Hi Mark,
Thanks, this helps. The kernel may not need this, but in general 
soft-float needs to generate library calls for floating-point 
operations. Is there a library for those for powerpc64? The compiler 
will need to know at least the names and parameters of these functions.

-Krzysztof