From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/7441 Path: news.gmane.org!not-for-mail From: Rich Felker Newsgroups: gmane.linux.lib.musl.general Subject: Re: ppc64 ABI Date: Sun, 19 Apr 2015 11:13:11 -0400 Message-ID: <20150419151311.GP6817@brightrain.aerifal.cx> References: <20150419135418.GP2875@port70.net> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1429456412 29353 80.91.229.3 (19 Apr 2015 15:13:32 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 19 Apr 2015 15:13:32 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-7454-gllmg-musl=m.gmane.org@lists.openwall.com Sun Apr 19 17:13:28 2015 Return-path: Envelope-to: gllmg-musl@m.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by plane.gmane.org with smtp (Exim 4.69) (envelope-from ) id 1YjquU-00055d-3Z for gllmg-musl@m.gmane.org; Sun, 19 Apr 2015 17:13:26 +0200 Original-Received: (qmail 20160 invoked by uid 550); 19 Apr 2015 15:13:24 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: Original-Received: (qmail 20134 invoked from network); 19 Apr 2015 15:13:23 -0000 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Original-Sender: Rich Felker Xref: news.gmane.org gmane.linux.lib.musl.general:7441 Archived-At: On Sun, Apr 19, 2015 at 03:40:20PM +0100, Justin Cormack wrote: > On 19 April 2015 at 14:54, Szabolcs Nagy wrote: > > * Justin Cormack [2015-04-19 12:44:15 +0100]: > >> I am looking at doing a ppc64 port, and after some discussion on irc > >> last night wondering which ABI to port to. > >> > >> ppc64 has two ABIs: > >> v1: as documented here > >> v2, usually known as powerpc64le, helpfully. It is not little endian > > ... > >> > >> Both have 16 byte long double oddness. > > > > printf/scanf decimal conversion and libm are broken with ibm128 > > > > if the toolchain could be configured to use ieee128 then that works > > (i see -mabi=ieeelongdouble compiler option in gcc, it seems 32bit > > powerpc sysv abi used to require ieee128 long double, but that was > > not implemented for aix and darwin so i'm not sure who uses it) > > > > 64bit long double works too and that's what musl uses on 32bit powerpc > > > > (i dont know how much code breaks if we change long double: > > i think on typical desktop/server it does not matter, but if you > > want to run some ppc optimized fortran code then it might..) > > The Fedora ppc64 gcc accepts -mlong-double-64 it turns out. OK. For a native toolchain we'd want to be able to make this the default, but if there's no immediate easier way, it could be put in a specfile for now. Rich